阅读说明：本技术 材料馈送机构、多料单元及3d打印系统 (Material feeding mechanism, multi-material unit and 3D printing system ) 是由 陶冶 田开望 于 2021-06-28 设计创作，主要内容包括：提供一种材料馈送机构、多料单元及3D打印系统。该材料馈送机构包括主体；下料离合组件,连接于主体；以及驱动组件,被构造为驱动下料离合组件在相对于主体的第一位置与相对于主体的第二位置之间可切换,在该第一位置处下料离合组件与料盘传动耦接,以在驱动组件的驱动下使料盘旋转从而将线材绕设于料盘上,在该第二位置处下料离合组件与料盘传动分离。(Provided are a material feeding mechanism, a multi-material unit and a 3D printing system. The material feed mechanism includes a body; the blanking clutch component is connected to the main body; and a drive assembly configured to drive the blanking clutch assembly to be switchable between a first position relative to the main body, at which the blanking clutch assembly is drivingly coupled with the material tray to rotate the material tray under the drive of the drive assembly to wind the wire around the material tray, and a second position relative to the main body, at which the blanking clutch assembly is drivingly decoupled from the material tray.)

1. A material feed mechanism comprising:

a main body;

the blanking clutch component is connected to the main body; and

a drive assembly configured to drive the blanking clutch assembly to be switchable between (i) a first position relative to the body, in which the blanking clutch assembly is drivingly coupled to a tray to rotate the tray to wind wire around the tray under drive of the drive assembly, and (ii) a second position relative to the body, in which the blanking clutch assembly is drivingly decoupled from the tray.

2. The material feed mechanism of claim 1, further comprising:

the blanking friction wheel is rotatably connected with the main body, the wheel surface of the blanking friction wheel is used for force transmission connection with the flange of the charging tray,

wherein, unloading clutch components with unloading friction pulley is constructed so that when unloading clutch components is in when the first position, unloading clutch components with unloading friction pulley transmission is coupled, so that pass through unloading friction pulley makes the charging tray is rotatory, and when unloading clutch components is in when the second position, unloading clutch components with unloading friction pulley transmission separation, so that unloading clutch components with the charging tray transmission separation.

3. The material feed mechanism of claim 2, further comprising:

a feeding clutch component connected with the main body,

wherein the drive assembly is further configured to drive the loading clutch assembly to be switchable between (i) a third position relative to the body, in which the loading clutch assembly is disengaged from the wire drive, and (ii) a fourth position relative to the body, in which the loading clutch assembly is coupled to the wire drive to drag the wire to be released from the tray under the drive of the drive assembly.

4. The material feed mechanism of claim 3, further comprising:

the feeding friction wheel is rotatably connected to the main body, the wheel surface of the feeding friction wheel is used for force transmission connection with the wire rod,

wherein the feeding clutch assembly and the feeding friction wheel are configured such that when the feeding clutch assembly is in the third position, the feeding clutch assembly is in drive disengagement with the feeding friction wheel such that the feeding clutch assembly is in drive disengagement with the wire, and when the feeding clutch assembly is in the fourth position, the feeding clutch assembly is in drive coupling with the feeding friction wheel to drag the wire through the feeding friction wheel.

5. The material feed mechanism of claim 4, wherein the blanking clutch assembly and the loading clutch assembly are configured such that when the blanking clutch assembly is in the first position, the loading clutch assembly is in the third position, and when the blanking clutch assembly is in the second position, the loading clutch assembly is in the fourth position.

6. The material feeding mechanism according to claim 5,

wherein the driving assembly comprises a driving motor connected to the main body and a transmission shaft in transmission coupling with an output shaft of the driving motor,

the blanking clutch assembly and the feeding clutch assembly are sleeved on the transmission shaft, so that the blanking clutch assembly and the feeding clutch assembly can pivot along the circumferential direction of the transmission shaft along with the rotation of the transmission shaft, and

wherein the blanking clutch assembly and the loading clutch assembly are at an angle to each other in a circumferential direction of the drive shaft such that when the blanking clutch assembly pivots in a first direction to the first position in the circumferential direction of the drive shaft, the loading clutch assembly pivots in the first direction to the third position, and when the blanking clutch assembly pivots in a second direction opposite to the first direction to the second position in the circumferential direction of the drive shaft, the loading clutch assembly pivots in the second direction to the fourth position.

7. The material feeding mechanism according to claim 6,

wherein, the blanking clutch component and the feeding clutch component are respectively sleeved at two ends of the transmission shaft and are used for

The output shaft of the driving motor is in transmission coupling with a part of the transmission shaft, which is positioned between the blanking clutch assembly and the loading clutch assembly.

8. The material feed mechanism of claim 6, wherein each of the blanking clutch assembly and the loading clutch assembly comprises:

the first connecting piece comprises a first end sleeved on the transmission shaft and a second end opposite to the first end;

the first gear is sleeved on the transmission shaft and is connected with the transmission shaft in a shape matching manner; and

a second gear rotatably connected to the second end of the first link and engaged with the first gear,

the first connecting piece abuts against the first gear, so that the first connecting piece and the second gear can pivot along the circumferential direction of the transmission shaft along with the rotation of the transmission shaft and the first gear.

9. The material feed mechanism of claim 8, further comprising:

a first matching gear which is coaxially connected with the blanking friction wheel,

wherein the first mating gear is configured such that when the blanking clutch assembly is in the first position, the first mating gear is engaged with the second gear of the blanking clutch assembly, and when the blanking clutch assembly is in the second position, the first mating gear is disengaged from the second gear of the blanking clutch assembly.

10. The material feed mechanism of claim 8, further comprising:

a second matching gear which is coaxially connected with the feeding friction wheel,

wherein the second mating gear is configured such that when the loading clutch assembly is in the third position, the second mating gear is disengaged from the second gear of the loading clutch assembly, and when the loading clutch assembly is in the fourth position, the second mating gear is engaged with the second gear of the loading clutch assembly.

11. The material feed mechanism of claim 8, wherein each of the blanking clutch assembly and the loading clutch assembly further comprises: a second link disposed opposite the first link with respect to the first gear and the second gear.

12. The material feed mechanism of claim 11, wherein each of the blanking clutch assembly and the loading clutch assembly further comprises: an elastic member spanning the first and second links to provide an elastic force for the first and second links to clamp the first gear.

13. The material feed mechanism of claim 12, wherein the resilient member comprises: the clamping device comprises an elastic piece body extending along the axial direction parallel to the transmission shaft and two clamping jaws respectively connected to two ends of the elastic piece body, wherein a first clamping jaw of the two clamping jaws abuts against the outer surface of the first connecting piece deviating from the first gear and the second gear, and a second clamping jaw of the two clamping jaws abuts against the outer surface of the second connecting piece deviating from the first gear and the second gear.

14. The material feed mechanism of claim 13,

wherein the outer surface of the first connecting piece is provided with a first groove,

wherein a second groove is arranged on the outer surface of the second connecting piece,

wherein, the first clamping jaw is provided with a first bulge which is clamped in the first groove, and

and a second bulge clamped in the second groove is arranged on the second clamping jaw.

15. The material feed mechanism according to any one of claims 1 to 14, wherein the main body has provided thereon:

the first limiting part is positioned on a moving path of the blanking clutch assembly relative to the main body, so that the blanking clutch assembly is in the first position when moving to abut against the first limiting part; and

the second limiting part is positioned on the moving path of the blanking clutch assembly relative to the main body, so that the blanking clutch assembly is in the second position when moving to abut against the second limiting part.

16. The material feed mechanism according to any one of claims 3 to 14, wherein the main body further has provided thereon:

the third limiting part is positioned on a moving path of the feeding clutch assembly relative to the main body, so that the feeding clutch assembly is in the third position when moving to abut against the third limiting part; and

the fourth limiting part is positioned on the moving path of the feeding clutch assembly relative to the main body, so that the feeding clutch assembly is located at the fourth position when moving to abut against the fourth limiting part.

17. A multi-charge unit comprising:

the material tray is respectively wound with at least one wire rod for the 3D printer; and

at least one material feed mechanism, each material feed mechanism comprising a material feed mechanism according to any one of claims 1-16,

wherein the at least one material feed mechanism is for use with a respective tray of the at least one tray to feed the at least one wire to the 3D printer.

18. A 3D printing system, comprising:

a 3D printer;

the material trays are respectively wound with at least one wire used for the 3D printer; and

at least one material feed mechanism, each material feed mechanism comprising:

a main body;

the blanking clutch component is connected to the main body; and

a drive assembly configured to drive the off-feed clutch assembly to be switchable between (i) a first position relative to the body, at which the off-feed clutch assembly is drivingly coupled with a corresponding tray of the at least one tray, to rotate the corresponding tray to wind a corresponding wire of the at least one wire around the corresponding tray under drive of the drive assembly, and (ii) a second position relative to the body, at which the off-feed clutch assembly is drivingly decoupled from the corresponding tray,

wherein the at least one material feed mechanism is for use with a respective tray of the at least one tray to feed the at least one wire to the 3D printer.

19. The 3D printing system of claim 18, wherein each material feed mechanism further comprises:

a feeding clutch component connected with the main body,

wherein the drive assembly is further configured to drive the loading clutch assembly to be switchable between (i) a third position relative to the body, in which the loading clutch assembly is drivingly decoupled from the corresponding wire, and (ii) a fourth position relative to the body, in which the loading clutch assembly is drivingly coupled to the corresponding wire to pull the corresponding wire to be released from the corresponding tray upon drive of the drive assembly.

20. The 3D printing system of claim 19, wherein for each material feed mechanism, the drive assembly is further configured to:

when the material feeding mechanism is operated for blanking, driving the blanking clutch assembly to move to the first position and driving the loading clutch assembly to move to the third position;

when the material feeding mechanism is operated for feeding, driving the blanking clutch assembly to move to the second position and driving the feeding clutch assembly to move to the fourth position; and is

When the material feed mechanism has been operated for feeding for printing by the 3D printer, the blanking clutch assembly is held in the second position, the feeding clutch assembly is held in the fourth position, and the drive assembly is turned off.

Technical Field

The present disclosure relates to the field of 3D printing technologies, and in particular, to a material feeding mechanism, a multi-material unit, and a 3D printing system.

Background

The 3D printing system is also called a three-dimensional printer, that is, a device capable of realizing rapid molding, and the 3D printer can manufacture a three-dimensional object by printing a layer of bonding material by using a special wax material, a powdered metal or a plastic and other bonding materials. Currently, a 3D printing system includes a 3D printer and a Multi-Material Unit (MMU), and the Multi-Material Unit can automatically switch the type or color of a wire according to a printing requirement and convey the wire to the 3D printer.

Disclosure of Invention

The embodiment of the disclosure provides a material feeding mechanism, a multi-material unit and a 3D printing system.

According to a first aspect of embodiments of the present disclosure, there is provided a material feeding mechanism comprising: a main body; the blanking clutch component is connected to the main body; and a drive assembly configured to drive the blanking clutch assembly to be switchable between (i) a first position relative to the main body, in which the blanking clutch assembly is drivingly coupled to the tray to rotate the tray to wind the wire around the tray under drive of the drive assembly, and (ii) a second position relative to the main body, in which the blanking clutch assembly is drivingly decoupled from the tray.

According to a second aspect of embodiments of the present disclosure, there is provided a multiple material unit comprising: the material tray is respectively wound with at least one wire rod for the 3D printer; and at least one material feed mechanism, each material feed mechanism comprising a material feed mechanism as described above, wherein the at least one material feed mechanism is for use with a respective tray of the at least one tray to feed the at least one wire to the 3D printer.

According to a third aspect of embodiments of the present disclosure, there is provided a 3D printing system comprising: a 3D printer; the material trays are respectively wound with at least one wire used for the 3D printer; and at least one material feed mechanism, each material feed mechanism comprising: a main body; the blanking clutch component is connected to the main body; and a drive assembly configured to drive the blanking clutch assembly to be switchable between (i) a first position relative to the body, at which the blanking clutch assembly is drivingly coupled with a corresponding one of the at least one tray, to rotate the corresponding tray to wind the corresponding one of the at least one wire around the corresponding tray under drive of the drive assembly, and (ii) a second position relative to the body, at which the blanking clutch assembly is drivingly decoupled from the corresponding tray, wherein the at least one material feed mechanism is for use with the corresponding one of the at least one tray to feed the at least one wire to the 3D printer.

According to the material feeding mechanism, the multi-material unit and the 3D printing system provided by the embodiment of the disclosure, the blanking clutch assembly and the driving assembly are arranged on the main body of the material feeding mechanism, and the driving assembly can drive the blanking clutch assembly to switch between the first position and the second position relative to the main body. At first position department, unloading clutch assembly is coupled with the charging tray transmission to thereby can make the charging tray rotatory around locating the wire rod on the charging tray under drive assembly's drive, avoided the unloading back wire rod unsettled or pile up in material feed mechanism, improved the reliability and the neatness of many material units. And the blanking clutch assembly is separated from the material tray in a transmission way at the second position, so that the 3D printing system can normally print the three-dimensional object.

Drawings

Fig. 1 is a schematic structural view of one material feed module in a multi-feed unit according to some embodiments of the present disclosure;

FIG. 2 is a right side view of the material feed module of FIG. 1;

FIG. 3 is a left side view of the material feed module of FIG. 1;

FIG. 4 is a schematic view of the material feed module of FIG. 1 with the tray removed;

FIG. 5 is an isometric view of a first angle of the material feed mechanism of FIG. 4;

FIG. 6 is a schematic structural view of the feed clutch assembly of the material feed mechanism of FIG. 5 in a first position, according to some embodiments of the present disclosure;

FIG. 7 is a schematic structural view of the feed clutch assembly of the material feed mechanism of FIG. 5 in a second position, according to some embodiments of the present disclosure;

FIG. 8 is a schematic structural view of a blanking clutch assembly in the material feed mechanism of FIG. 5;

FIG. 9 is an exploded schematic view of the feed clutch assembly of FIG. 8;

FIG. 10 is a schematic view of the material feed mechanism of FIG. 5 with the body removed;

FIG. 11 is a second angular isometric view of the material feed mechanism of FIG. 4;

FIG. 12 is a schematic view of the material feed mechanism of FIG. 11 with the wire support bracket removed;

FIG. 13 is a schematic structural view of the material feed mechanism of FIG. 12 with the material feed clutch assembly in a third position, according to some embodiments of the present disclosure;

fig. 14 is a schematic structural view of the material feed mechanism of fig. 12 with the upper feed clutch assembly in a fourth position, according to some embodiments of the present disclosure.

Detailed Description

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present disclosure.

Spatially relative terms such as "below …," "below …," "lower," "below …," "above …," "upper," and the like may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that these spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" may encompass both an orientation above … and below …. Terms such as "before …" or "before …" and "after …" or "next to" may similarly be used, for example, to indicate the order in which light passes through the elements. The devices may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. In addition, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, and the phrase "at least one of a and B" refers to a alone, B alone, or both a and B.

It will be understood that when an element or layer is referred to as being "on," "connected to," "coupled to" or "adjacent to" another element or layer, it can be directly on, connected to, coupled to or adjacent to the other element or layer or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," or "directly adjacent to" another element or layer, there are no intervening elements or layers present. However, neither "on … nor" directly on … "should be construed as requiring that one layer completely cover an underlying layer in any event.

Embodiments of the present disclosure are described herein with reference to schematic illustrations (and intermediate structures) of idealized embodiments of the present disclosure. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the present disclosure should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the present disclosure.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In the related art, the multi-material unit may include a material guiding pipe, a material tray, a material loading friction wheel, and a motor connected to the material loading friction wheel, wherein a wire is wound around the material tray, an end of the wire contacts the friction wheel, and the motor drives the material loading friction wheel to rotate forward during material loading, so as to convey the wire into the material guiding pipe. The 3D printer utilizes the wire rod in the passage to realize printing. When the printing is finished or the wires are replaced, the motor drives the feeding friction wheel to rotate reversely so as to recycle the wires in the material guide pipe into the material conveying unit.

However, the wires in the related art are recycled and then hung or stacked in the multi-material unit, the wires are easily wound on other parts, normal work of the multi-material unit is affected, and the wires are messy and cause poor tidiness of the multi-material unit.

The embodiment of the disclosure provides a material feeding mechanism, a multi-material unit and a 3D printing system. Through setting up drive assembly and unloading separation and reunion subassembly, drive assembly can be coupled with the charging tray transmission through unloading separation and reunion subassembly to it is rotatory to drive the charging tray, in order to twine the wire rod on the charging tray, has avoided the wire rod unsettled or has piled up.

The present disclosure is illustrated in detail below with reference to examples. It is to be understood that the drawings of the present disclosure show only a portion of the entire structure of the gears, and that other gears are represented by cylindrical structures, and the detailed structure thereof is not shown, in order to more clearly show the structure of the embodiments of the present disclosure.

Fig. 1 is a schematic structural view of one material feed module in a multi-feed unit according to some embodiments of the present disclosure;

FIG. 2 is a right side view of the material feed module of FIG. 1; FIG. 3 is a left side view of the material feed module of FIG. 1; fig. 4 is a schematic view of the material feeding module of fig. 1 with the tray removed.

It is understood that the multi-feed unit may include at least one material feeding module and a guide tube (not shown) shared by the at least one material feeding module. When the 3D printer needs to use a wire of a certain color or material, the material feeding module having the wire in the multi-material unit conveys the wire into the guide tube. A printing motor in the 3D printer drags the wire rods in the material guide pipes and conveys the wire rods to the hot end of the 3D printer to realize printing operation. In the example of fig. 1-3, the material feed module includes a material feed mechanism 100, a tray 200, and a tray holder 400. The tray 200 is wound with wires, and the tray 200 is rotatably connected to the tray support 400. The material feeding mechanism 100 is attached to the tray holder 400.

FIG. 5 is a first angled isometric view of the material feed mechanism 100 of FIG. 4; FIG. 6 is a schematic structural view of the feed clutch assembly of the material feed mechanism of FIG. 5 in a first position; fig. 7 is a schematic structural view of the feed clutch assembly in a second position in the material feed mechanism of fig. 5. For convenience of explanation, the blanking friction wheel 150 shown in fig. 5 is hidden in fig. 6 and 7. Referring to fig. 5 to 7, the material feeding mechanism 100 includes: main part 110, unloading clutch assembly 120 and drive assembly 130.

The main body 110 may be a support member of the material feeding mechanism 100, which may be connected with the tray holder 400. The main body 110 may be made of a metal material, a plastic material, or other common materials.

Both the blanking clutch assembly 120 and the driving assembly 130 are connected to the main body 110. The blanking clutch assembly 120 is switchable between a first position (shown in fig. 6) relative to the main body 110 and a second position (shown in fig. 7) relative to the main body 110 by the driving of the driving assembly 130.

When the blanking clutch assembly 120 is located at the first position, the blanking clutch assembly 120 can be drivingly coupled with the tray 200. The blanking clutch assembly 120 can transmit the driving force output by the driving assembly 130 to the tray 200, so that the tray 200 can rotate under the driving of the driving assembly 130, thereby winding the wire on the tray 200.

When the blanking clutch assembly 120 is located at the second position, the blanking clutch assembly 120 is separated from the tray 200 in a transmission manner, i.e., the driving force of the driving assembly 130 cannot be transmitted to the tray 200.

The driving assembly 130 may include a motor, a hydraulic cylinder, an air cylinder, or the like capable of outputting a rotational motion or a linear motion. The structure of the blanking clutch assembly 120 can be various. In some embodiments, the driving assembly 130 may include a rotary motor capable of outputting a rotary motion and optionally a linear motor capable of outputting a linear motion, the rotary shaft of the tray 200 may be provided with a driven gear, and the discharging clutch assembly 120 may include a driving gear capable of meshing with the driven gear. In some embodiments, the drive assembly 130 may include a rotary motor without a linear motor, as will be described in further detail later.

In embodiments where the drive assembly 130 includes a linear motor, the linear motor may be mounted to the body 110, and the motor housing of the rotary motor may be coupled to the output shaft of the linear motor, which may be coaxially coupled to the drive gear. The linear motor can synchronously drive the rotating motor and the driving gear to move along the linear direction, so that the driving gear is switched between the first position and the second position. When the driving gear is located the first position, the rotating electrical machines can drive the driving gear to rotate, and the driven gear meshed with the driving gear drives the tray 200 to rotate, so that the wire rod is wound on the tray 200. When the driving gear is located at the second position, the driving gear is separated from the driven gear, and power cannot be transmitted to the driven gear from the rotating motor.

It can be understood that when the 3D printer completes printing or needs to replace the wire, the driving assembly 130 drives the blanking clutch assembly 120 to move to the first position relative to the main body 110, and the blanking clutch assembly 120 is drivingly coupled to the tray 200. The driving assembly 130 can drive the tray 200 to rotate through the blanking clutch assembly 120, so that the wires are withdrawn from the material guiding pipe and rewound to the tray 200, and the wires are prevented from being suspended or accumulated. Furthermore, the wire is prevented from being wound to other parts, so that the multi-material unit can work normally and the reliability is high. Simultaneously, can also make many material units neater.

When the 3D printer needs to perform a printing operation, the driving assembly 130 may, for example, drive the discharging clutch assembly 120 to move to the second position relative to the main body 110, and the discharging clutch assembly 120 is separated from the tray 200. The wire in the guide tube can be continuously conveyed to the hot end (not shown) of the 3D printer under the driving of a printing motor of the 3D printer. Because unloading clutch assembly 120 and charging tray 200 transmission separation, unloading clutch assembly 120 can not hinder the rotation of charging tray 200, and charging tray 200 can be relative charging tray support 400 free rotation under the drive of wire rod, and 3D printing system can normally print three-dimensional object. Moreover, the driving assembly 130 is not driven by the tray 200 during the printing operation, thereby reducing unnecessary wear.

With continued reference to fig. 1, in this example, the tray 200 may include a central body and flanges 210 on either side of the central body. The intermediate body can be used for winding wires, and the flange 210 can protrude out of the intermediate body along the circumferential direction, so that the effect of blocking the wires is achieved, and the wires are prevented from being separated from the tray 200.

With continued reference to fig. 5-7, in some embodiments, the material feed mechanism 100 can further include a blanking friction wheel 150 rotatably connected to the body 110. The wheel surface of the blanking friction wheel 150 is used for force transmission connection with the flange 210 of the charging tray 200. When the blanking clutch assembly 120 is in the first position, the blanking clutch assembly 120 is drivingly coupled to the blanking friction wheel 150 to rotate the tray 200 via the blanking friction wheel 150. When the blanking clutch assembly 120 is in the second position, the blanking clutch assembly 120 is in transmission separation with the blanking friction wheel 150, so that the blanking clutch assembly 120 is in transmission separation with the material tray 200.

The blanking friction wheel 150 may be a wheel-shaped structure, and the wheel surface thereof may be provided with a knurl or the like. When the blanking clutch assembly 120 is at the first position, the blanking clutch assembly 120 can be in transmission connection with the blanking friction wheel 150, and the driving force of the driving assembly 130 can be transmitted to the blanking friction wheel 150 through the blanking clutch assembly 120 and transmitted to the flange 210 through the blanking friction wheel 150, so as to drive the charging tray 200 to rotate. Because the wheel surface of the blanking friction wheel 150 is provided with the knurls, the static friction force between the wheel surface and the flange 210 can be increased, and the charging tray 200 can be effectively driven to rotate. The scheme has a simple structure and is easy to realize. Meanwhile, power is transmitted between the material tray 200 and the material feeding mechanism 100 only by the contact surface between the wheel surface of the discharging friction wheel 150 and the flange 210 of the material tray 200, the structure of the material tray 200 does not need to be designed in a complex way, the material tray 200 can be taken out of the material tray bracket 400 conveniently, and the material tray 200 is convenient to replace.

FIG. 8 is a schematic view of the construction of the feed clutch assembly 120 of the material feed mechanism of FIG. 5; fig. 9 is an exploded schematic view of the feed clutch assembly 120 of fig. 8. With continued reference to fig. 5, 8, and 9, in some embodiments, the drive assembly 130 may include a drive motor 131 connected to the body 110 and a drive shaft 132 drivingly coupled to an output shaft of the drive motor 131. The blanking clutch assembly 120 may include: a first link 121, a first gear 122 and a second gear 123.

The first gear 122 is sleeved on the transmission shaft 132 and is connected with the transmission shaft 132 in a shape matching manner. That is, the first gear 122 may be provided with a non-circular through hole, and the transmission shaft 132 may have a fitting section having a shape matching the non-circular through hole. The transmission shaft 132 may be sleeved on the mating section, such that the first gear 122 and the transmission shaft 132 may be kept relatively stationary. When the driving shaft 132 is rotated by the driving motor 131, the first gear 122 may be rotated along therewith.

The first link 121 may be located at one side of the first gear 122 in the rotational axis direction of the first gear 122. The first connecting member 121 includes a first end 1212 sleeved on the transmission shaft 132 and a second end 1213 opposite to the first end 1212. The first connecting member 121 may be made of a common material such as metal or plastic. The first end 1212 of the first connecting member 121 may be provided with a first through hole, and the transmission shaft 132 may be disposed through the first through hole.

The second gear 123 is rotatably connected to the second end 1213 of the first link 121. In an example, the second end 1213 of the first connector 121 may be provided with a second through hole, and the rotation shaft passes through the second gear 123 and the second through hole, thereby connecting the second gear 123 and the first connector 121. In another example, the second end 1213 of the first connecting member 121 is integrally provided with a rotating shaft, and the rotating shaft passes through the second gear 123, so that the second gear 123 is rotatably connected to the first connecting member 121.

The first gear 122 and the second gear 123 are engaged. From the position, the first gear 122 and the second gear 123 are respectively located at two ends of the first connecting member 121, and the first connecting member 121 abuts against the first gear 122. It is understood that the first end 1212 of the first connecting member 121 is sleeved on the transmission shaft 132, but is not directly fixed therebetween. The first connecting element 121 may be kept relatively fixed by means of a pressure force generated by mutual abutment between the first connecting element 121 and the first gear 122, and the pressure force may cause a friction force between the first connecting element 121 and the first gear 122, and the friction force may cause the first connecting element 121 and the second gear 123 to pivot along the circumferential direction of the transmission shaft 132 along with the rotation of the transmission shaft 132 and the first gear 122. That is, the first gear 122, the second gear 123 and the first link 121 may rotate as a whole following the transmission shaft 132. In addition, when an external force is present, it may serve to overcome a frictional force between the first link 121 and the second gear 122 so that the first link 121 and the second gear 123 may rotate as a whole with respect to the first gear 122. That is, the first link 121 and the second gear 123 may pivot in the circumferential direction thereof with respect to the transmission shaft 132.

In order to allow the first gear 122 to abut against the first connector 121, two shoulders may be provided on the transmission shaft 132, each of which may have a diameter larger than that of the transmission shaft 132. The two shoulders may be respectively located at two sides of the blanking clutch assembly 120 along the axial direction of the transmission shaft 132, and the first connecting member 121 may abut against one of the shoulders, and the first gear 122 may abut against the other shoulder. The first connecting member 121 can abut against the first gear 122 by reasonably adjusting the dimension between the two shoulders.

In an example, in order that the second gear 123 may rotate the blanking friction wheel 150, the blanking friction wheel 150 may include a first wheel body and a second wheel body sequentially arranged along an axial direction of the friction wheel 150. The first wheel body and the second wheel body can be integrally formed. The first wheel body has a wheel surface provided with knurls and the second wheel body may have a plurality of teeth arranged in a circumferential direction, which second wheel body may be adapted to mesh with the second gear 123.

Referring to fig. 6 and 8, when the 3D printer finishes printing or needs to replace a wire, the driving motor 131 drives the transmission shaft 132 to rotate in a first direction (arrow direction in fig. 6), so as to drive the first connecting member 121, the first gear 122 and the second gear 123 to rotate relative to the body 110 as a whole, so that the second gear 123 can swing to a position where it can mesh with the second wheel body of the blanking friction wheel 150, that is, the blanking clutch assembly 120 is in the first position. Since the blanking friction wheel 150 is engaged with the second gear 123, when the driving motor 131 continues to drive the transmission shaft 132 to rotate in the first direction, the blanking friction wheel 150 provides resistance to block the second wheel body 122 and the first connecting member 121 from rotating in the circumferential direction of the transmission shaft 132. The resistance force can overcome the friction between the first link 121 and the first gear 122, so that relative rotation occurs between the first gear 122 and the first link 121. That is, the first gear 122 may continue to rotate following the transmission shaft 132, while the first connector 121 may remain stationary relative to the body 110. Because the first gear 122 is engaged with the second gear 123, the first gear 122 rotates along with the transmission shaft 132 to drive the second gear 123 to rotate relative to the first connecting member 121, and the second gear 123 can drive the blanking friction wheel 150 to rotate through the second wheel body, thereby driving the tray 200 to rotate. This scheme simple structure only needs a driving motor 131 can realize the removal of unloading clutch assembly 120 between primary importance and second place, can reduce cost. Referring to fig. 5 and 7, when the driving motor 131 drives the transmission shaft 132 to rotate in a second direction opposite to the first direction, the second gear 123 may be in transmission separation with the second wheel body, and the discharging clutch assembly 120 is in the second position.

In the above embodiment, the blanking friction wheel 150 includes a first wheel body for being drivingly coupled with the tray 200 and a second wheel body for being drivingly coupled with the blanking clutch assembly 120. In other embodiments, the material feeding mechanism 100 may further include a first mating gear 151 coaxially coupled to the blanking friction wheel 150, as shown in fig. 5. For example, a rotatable blanking rotating shaft may be disposed on the main body 110, and both the first engaging gear 151 and the blanking friction wheel 150 may be connected to the blanking rotating shaft through a shape fit, so as to simplify the processing of the blanking friction wheel 150 and reduce the cost.

The first mating gear 151 is configured such that when the blanking clutch assembly 120 is in the first position, the first mating gear 151 is engaged with the second gear 123 of the blanking clutch assembly 120. The second gear 123 can drive the first engaging gear 151 to rotate, and further drive the blanking friction wheel 150 to rotate. And when the blanking clutch assembly 120 is in the second position, the first mating gear 151 is disengaged from the second gear 123 of the blanking clutch assembly 120.

In some embodiments, the blanking clutch assembly 120 further comprises: and a second link 124 disposed opposite to the first link 121 with respect to the first gear 122 and the second gear 123.

With continued reference to fig. 8 and 9, the first and second connectors 121 and 124 may be located on both sides of the first and second gears 122 and 123, respectively, in the axial direction of the transmission shaft 132. Both sides of the first gear 122 may abut against the first and second connectors 121 and 124, respectively.

The second connecting member 124 may also be sleeved on the transmission shaft 132, and specifically, reference may be made to a connection manner between the first end 1212 of the first connecting member 121 and the transmission shaft 132.

In an example, the second end 1213 of the first connecting member 121 is integrally provided with a rotating shaft, and the second connecting member 124 is provided with a shaft hole at a corresponding position, and the rotating shaft penetrates through the second gear 123 and the shaft hole, so as to rotatably connect the second gear 123 between the first connecting member 121 and the second connecting member 124. In another example, the second connecting member 124 is provided with a rotating shaft, and the first connecting member 121 is provided with a shaft hole, and the rotating shaft penetrates through the second gear 123 and the shaft hole.

The blanking clutch assembly 120 may include an elastic member 125, and the elastic member 125 spans the first and second connecting members 121 and 124 to provide elastic force that enables the first and second connecting members 121 and 124 to clamp the first gear 122. The elastic member 125 can continuously provide elastic force, thereby improving the reliability of the blanking clutch assembly 120.

The elastic member 125 may have various structures. For example, the elastic member 125 may include a spring having one end connected to the first link 121 and the other end connected to the second link 124, and the spring may provide a tensile force such that the first link 121 and the second link 124 clamp the first gear 122.

For another example, the elastic member 125 includes: an elastic member body 1251 extending in an axial direction parallel to the transmission shaft 132, and two jaws respectively connected to both ends of the elastic member body 1251. For ease of description, the two jaws are designated as first jaw 1252 and second jaw 1253, respectively. The first jaw 1252 abuts against an outer surface of the first connector 121 facing away from the first and second gears 122, 123, and the second jaw 1253 abuts against an outer surface of the second connector 124 facing away from the first and second gears 122, 123.

The distance between the first jaw 1252 and the second jaw 1253 may be smaller than the distance between the outer surface of the first connector 121 and the outer surface of the second connector 124, so that when the elastic member 125 spans the first connector 121 and the second connector 124, the first jaw 1252 and the second jaw 1253 may be elastically deformed relative to the elastic member body 1251, and the distance between the two becomes larger, thereby providing an elastic force for clamping the first connector 121 and the second connector 124. And first clamping jaw 1252, second clamping jaw 1253 and elastic member body 1251 can be set up to lean against or close to first connecting piece 121 and second connecting piece 124, can reduce the space volume of unloading clutch assembly 120.

In the example, a first groove 1211 is provided on an outer surface of the first connector 121, and a second groove 1241 is provided on an outer surface of the second connector 124. First jaw 1252 is provided with a first projection 1252a engaged with first recess 1211, and second jaw 1253 is provided with a second projection 1253a engaged with second recess 1241. This can increase the contact area between the first connecting member 121 and the first clamping jaw 1252 and between the second connecting member 124 and the second clamping jaw 1253, so that the elastic member 125 is not easily separated from the first connecting member 121 and the second connecting member 124, and the reliability of the blanking clutch assembly 120 is improved.

In some embodiments, the main body 110 may further include a first position-limiting portion 111 and a second position-limiting portion 112. The blanking clutch assembly 120 can move between the first and second position-limiting portions 111 and 112. The first and second position-limiting portions 111 and 112 may protrude from the main body 110. Taking the first position-limiting portion 111 as an example, the first position-limiting portion 111 may include a bolt, a threaded section of the bolt may be screwed into a threaded hole of the body 110, and a head of the bolt may be located outside the threaded hole.

The first position-limiting part 111 is positioned on a moving path of the feeding clutch assembly 120 relative to the main body 110, so that the feeding clutch assembly 120 is in a first position when moving to abut against the first position-limiting part 111. Referring to fig. 6 and 8, the first position-limiting portion 111 is disposed opposite to the second end 1213 of the second connecting member 124 of the blanking clutch assembly 120, such that when the blanking clutch assembly 120 is in the first position, an upper edge of the second end 1213 of the second connecting member 124 can abut against the first position-limiting portion 111. The first position-limiting portion 111 can provide a resistance force against the friction between the first connecting member 121 and the first gear 122, so that the blanking clutch assembly 120 can be maintained at the first position. By means of the first limiting part 111, the contact force between the second gear 123 and the first matching gear 151 can be reduced, the abrasion between the second gear 123 and the first matching gear 151 is reduced, and the service life of the blanking clutch component 120 is prolonged.

The second position-limiting portion 112 is positioned on a moving path of the feeding clutch assembly 120 relative to the main body 110, so that the feeding clutch assembly 120 is in the second position when moving to abut against the second position-limiting portion 112. Referring to fig. 7 and 8, the second position-limiting portion 112 is disposed opposite to the second end 1213 of the second connecting member 124 of the blanking clutch assembly 120, such that the lower edge of the second end 1213 of the second connecting member 124 can abut against the second position-limiting portion 112 when the blanking clutch assembly 120 is in the second position. The second position-limiting portion 112 can provide a resistance force against the friction force between the first connecting member 121 and the first gear 122, so that the blanking clutch assembly 120 can be maintained at the second position when the transmission shaft 132 continues to rotate in the second direction, the moving path of the blanking clutch assembly 120 can be reduced, and useless movement of the blanking clutch assembly 120 can be reduced.

It can be understood that the protruding dimension of the first and second position-limiting parts 111 and 112 from the main body 110 is larger than the gap between the second connecting part 124 and the main body 110, and smaller than the gap between the second gear 123 and the main body 110. Thus, the first and second position-limiting portions 111 and 112 can perform a position-limiting function without interfering with the normal rotation of the second gear 123.

The functions of the first and second position-limiting portions 111 and 112 are described above by taking the example that the second connecting member 124 of the blanking clutch assembly 120 is located between the first connecting member 121 and the main body 110 (as shown in fig. 5). In some embodiments, the first connecting element 121 may be located between the second connecting element 124 and the main body 110, and the first position-limiting portion 111 and the second position-limiting portion 112 may be respectively configured to abut against upper and lower edges of the first connecting element 121. The relative spatial terms "upper" and "lower" are used herein with reference to fig. 6 and 7, and should not be taken as limiting.

FIG. 10 is a schematic view of the material feed mechanism of FIG. 5 with the body 110 removed; FIG. 11 is a second angular isometric view of the material feed mechanism 100 of FIG. 4; FIG. 12 is a schematic view of the material feed mechanism of FIG. 11 with the wire support bracket removed; FIG. 13 is a schematic illustration of the material feed mechanism of FIG. 12 with the material feed clutch assembly 140 in a third position; fig. 14 is a schematic diagram of the material feeding mechanism of fig. 12 with the loading clutch assembly 140 in a fourth position. The direction of the arrow in fig. 13 is the first direction.

Referring to fig. 10-14, in some embodiments, the material feed mechanism 100 further includes a feed clutch assembly 140, the feed clutch assembly 140 being connected to the main body 110. The loading clutch assembly 140 may be switchable between a third position (shown in fig. 13) relative to the main body 110 and a fourth position (shown in fig. 14) relative to the main body 110 under the driving of the driving assembly 130.

When the feeding clutch assembly 140 is located at the third position, the feeding clutch assembly 140 may be separated from the wire 300, i.e., the driving force of the driving assembly 130 cannot be transmitted to the wire 300.

When the feeding clutch assembly 140 is located at the fourth position, the feeding clutch assembly 140 is in transmission coupling with the wire 300, and the feeding clutch assembly 140 can transmit the driving force output by the driving assembly 130 to the wire 300 to drag the wire 300 to be released from the tray 200 under the driving of the driving assembly 130.

In an example, a wire support bracket 115 may be provided on the body 100. The wire 300 is wound on the tray 200, and the end of the wire 300 can be extended out of the tray 200 and positioned on the wire support frame 115. The wire wound around the tray 200 is not shown in the drawings in order to fully show the structure of the material feeding mechanism 100.

When the 3D printer needs to print a three-dimensional object, the driving assembly 130 drives the feeding clutch assembly 140 to move to the fourth position relative to the main body 110, and the feeding clutch assembly 140 is in transmission coupling with the wire 300, so that the wire 300 can be dragged to convey the wire 300 into the material guide tube.

Then, the driving assembly 130 may, for example, drive the feeding clutch assembly 140 to move to a third position relative to the main body 110, and the feeding clutch assembly 140 and the wire 300 are separated in transmission. At this time, the printing motor of the 3D printer may drag the wire 300 in the guide tube and implement the printing operation. The process does not need the driving assembly 130 to provide driving force, and energy can be saved. Meanwhile, since the feeding clutch assembly 140 and the wire 300 are separated in a transmission manner, the driving force of the printing motor dragging the wire 300 can be prevented from being transmitted to the driving assembly 130, thereby reducing the load of the printing motor. Moreover, the driving assembly 130 is not driven by the wire 300 during the printing operation, thereby reducing unnecessary wear.

The feeding clutch assembly 140 can be driven in various ways. For example, the driving assembly 130 may include a first motor for driving the feeding clutch assembly 140 to move between the third position and the fourth position, and a second motor for driving the discharging clutch assembly 120 to move between the first position and the second position.

In other embodiments, the feeding clutch assembly 140 and the discharging clutch assembly 120 may be driven by the same driving motor 131. The blanking clutch assembly 120 and the loading clutch assembly 140 are respectively sleeved at two ends of the transmission shaft 132, and the output shaft of the driving motor 131 is drivingly coupled to a portion of the transmission shaft 132 between the blanking clutch assembly 120 and the loading clutch assembly 140.

In an embodiment, the body 110 may have two oppositely disposed first walls 116 (fig. 5) and second walls 117 (fig. 12). The driving motor 131 may be disposed between the first wall 116 and the second wall 117, and the transmission shaft 132 may be simultaneously inserted through the first wall 116 and the second wall 117. As shown in fig. 10, an output shaft of the driving motor 131 may be coaxially provided with a worm 135, and a portion of the transmission shaft 132 between the first wall surface 116 and the second wall surface 117 may be sleeved with a worm wheel 134. The worm wheel 134 cooperates with the worm 135 so that the direction of the torque output by the driving motor 131 can be changed, simplifying the structure of the material feeding mechanism 100.

Referring to fig. 5, a first end of the transmission shaft 132 extending out of the first wall 116 may be connected to the blanking clutch assembly 120. Referring to fig. 12, a loading clutch assembly 140 may be connected to a second end of the transmission shaft 132 extending out of the second wall 117. In order to prevent the blanking clutch assembly 120 and the loading clutch assembly 140 from moving in the axial direction of the transmission shaft 132, a baffle 133 may be further disposed on the transmission shaft 132. A baffle 133 is arranged on the side of the feeding clutch assembly 140 departing from the main body 110, and a baffle 133 can also be arranged on the side of the blanking clutch assembly 120 departing from the main body 110.

Referring to fig. 10, in some embodiments, the material feed mechanism 100 further comprises a loading friction wheel 160 rotatably connected to the body 110, a tread of the loading friction wheel 160 for force-transferring connection with the wire 300. When the feeding clutch assembly 140 is in the third position, the feeding clutch assembly 140 is in transmission separation with the feeding friction wheel 160, so that the feeding clutch assembly 140 is in transmission separation with the wire 300, and when the feeding clutch assembly 140 is in the fourth position, the feeding clutch assembly 140 is in transmission coupling with the feeding friction wheel 160, so as to drag the wire 300 through the feeding friction wheel 160.

Referring to fig. 11, the loading friction wheel 160 may have a wheel-shaped structure, and the wheel surface thereof may be provided with knurling or the like. The tread of the feeding friction wheel 160 may be used to contact the wire 300, thereby moving the wire 300 along the tangential direction of the feeding friction wheel 160. In an example, the wire 300 may be located between the tread of the feeding friction wheel 160 and the wire support frame 115, and the feeding friction wheel 160 may drive the wire 300 to slide along the surface of the wire support frame 115. In another example, a rotatable driven friction wheel may be provided on the body 110, and the wire 300 may be positioned between the tread of the loading friction wheel 160 and the tread of the driven friction wheel. When the feeding friction wheel 160 rotates, the driven friction wheel 160 rotates along with the feeding friction wheel 160 to drag the wire 300, so that the friction force between the wire 300 and the feeding friction wheel 160 and the driven friction wheel is rolling friction, and the wire 300 is more easily dragged.

When the loading clutch assembly 140 is in the fourth position, the loading clutch assembly 140 may be drivingly coupled to the loading friction wheel 160. The driving force of the driving assembly 130 can be transmitted to the feeding friction wheel 160 through the feeding clutch assembly 140, and transmitted to the wire 300 through the feeding friction wheel 160, so as to drive the wire 300 to move. Because the wheel surface of the feeding friction wheel 160 is provided with the knurls, the static friction force between the wheel surface and the wire 300 can be increased, and the wire 300 can be effectively driven to move. The scheme has the advantages of simple structure, easy realization and production cost reduction.

There are also various implementations of the loading clutch assembly 140. In some embodiments, the structure of the feeding clutch assembly 140 is the same as the structure of the discharging clutch assembly 120, and the difference between the functions is that when the feeding clutch assembly 140 is in the fourth position, the feeding clutch assembly 140 is drivingly coupled to the wire 300, and when the discharging clutch assembly 120 is in the first position, the discharging clutch assembly 120 is drivingly coupled to the tray 200. Namely, the structure of the transmission coupling of the blanking clutch assembly 120 and the loading clutch assembly 140 is different.

For example, the feeding clutch assembly 140 may also include a first connecting member, a first gear, and a second gear. The first connecting member includes a first end sleeved on the transmission shaft 132 and a second end opposite to the first end. The first gear is sleeved on the transmission shaft 132 and is connected with the transmission shaft 132 in a shape matching manner. The second gear is rotatably connected to the second end of the first connecting piece and meshed with the first gear. The first connecting piece abuts against the first gear so that the first connecting piece and the second gear can pivot along the circumferential direction of the transmission shaft 132 along with the rotation of the transmission shaft 132 and the first gear.

In an example, the loading clutch assembly 140 further includes: and a second link disposed opposite the first link with respect to the first gear and the second gear.

In an example, the loading clutch assembly 140 further includes: and the elastic piece is bridged across the first connecting piece and the second connecting piece to provide elastic force for clamping the first connecting piece and the second connecting piece to the first gear.

As an example implementation of the elastic member of the feeding clutch assembly 140, the elastic member includes: an elastic body extending in an axial direction parallel to the transmission shaft 132, and two jaws respectively connected to both ends of the elastic body. A first clamping jaw of the two clamping jaws is abutted against the outer surface of the first connecting piece, which is deviated from the first gear and the second gear, and a second clamping jaw of the two clamping jaws is abutted against the outer surface of the second connecting piece, which is deviated from the first gear and the second gear.

Further, in the feeding clutch assembly 140, a first groove may be disposed on an outer surface of the first connecting member, and a second groove may be disposed on an outer surface of the second connecting member. The first clamping jaw is provided with a first bulge clamped in the first groove, and the second clamping jaw is provided with a second bulge clamped in the second groove.

The first connecting member, the first gear, the second gear, the elastic member, and the second connecting member in the feeding clutch assembly 140 are the same as the first connecting member 121, the first gear 122, the second gear 123, the elastic member 125, and the second connecting member 124 in the discharging clutch assembly 120 in structure and function, and reference may be specifically made to the above description of the discharging clutch assembly 120, and no further description is provided here.

In some embodiments, in order to enable the second gear of the feeding clutch assembly 140 to rotate the feeding friction wheel 160, the feeding friction wheel 160 may include a third wheel body and a fourth wheel body. The third wheel body and the fourth wheel body can be integrally formed and processed. The third wheel body has a wheel face provided with a knurl, and the fourth wheel body may have a plurality of teeth arranged in a circumferential direction, and the fourth wheel body may be configured to mesh with the second gear 123.

In other embodiments, the material feeding mechanism 100 may include a second mating gear 161, the second mating gear 161 being coaxially connected with the feeding friction wheel 160, as shown in fig. 11. For example, the main body 110 may be provided with a rotatable feeding rotating shaft, and both the second engaging gear 161 and the feeding friction wheel 160 may be connected to the feeding rotating shaft through shape fitting, so as to simplify the processing of the discharging friction wheel 150 and reduce the cost.

The second mating gear 161 is configured such that when the feeding clutch assembly 140 is at the third position, the second mating gear 161 is separated from the second gear of the feeding clutch assembly 140, and when the feeding clutch assembly 140 is at the fourth position, the second mating gear 161 is engaged with the second gear of the feeding clutch assembly 140, and the second gear can drive the second mating gear 161 to rotate, and thus the feeding friction wheel 160 to rotate.

Referring to fig. 14, when the 3D printer needs to print a three-dimensional object, the driving motor 131 drives the transmission shaft 132 to rotate in a second direction (a direction opposite to the arrow in fig. 13), so as to drive the first connecting piece, the first gear and the second gear of the feeding clutch assembly 140 to rotate as a whole relative to the body 110, so that the second gear can swing to a position capable of meshing with the second mating gear 161, that is, the feeding clutch assembly 140 is located at the fourth position. Since the second engaging gear 161 is engaged with the second gear, when the driving motor 131 continues to drive the transmission shaft 132 to rotate in the second direction, the second engaging gear 161 provides resistance to prevent the second wheel body and the first connecting member from rotating in the circumferential direction of the transmission shaft 132. The resistance force can overcome the friction force between the first connecting piece and the first gear, so that relative rotation between the first gear and the first connecting piece can be generated. That is, the first gear may continue to rotate following the drive shaft 132 while the first link may remain stationary relative to the body 110. Due to the engagement of the first gear and the second gear, the first gear can drive the second gear to rotate relative to the first connecting member, and the second gear can drive the second matching gear 161 to rotate, so as to drive the feeding friction wheel 160 to rotate, so as to drag the wire 300 to move along the direction from right to left in fig. 14 (i.e. in fig. 11, the wire 300 moves along the arrow direction), thereby conveying the wire 300 to the material guiding pipe. After the wire 300 is fed to the guide duct, the driving motor 131 may, for example, drive the transmission shaft 132 to rotate in a first direction (arrow direction in fig. 13), the second gear of the feeding clutch assembly 140 may be separated from the second mating gear 161, and the feeding clutch assembly 140 is in a third position (as shown in fig. 13). At this moment, the printing motor of 3D printer can continue to drag the interior wire rod of guide pipe and realize printing the operation.

In some embodiments, the blanking clutch assembly 120 and the loading clutch assembly 140 are configured such that when the blanking clutch assembly 120 is in the first position, the loading clutch assembly 140 is in the third position, and when the blanking clutch assembly 120 is in the second position, the loading clutch assembly 140 is in the fourth position.

In the blanking operation, when the blanking clutch assembly 120 is in the position shown in fig. 6, the loading clutch assembly 140 is in the position shown in fig. 13. In the loading operation, when the loading clutch assembly 120 is in the position shown in fig. 7, the loading clutch assembly 140 is in the position shown in fig. 14.

When the 3D printer completes printing or the wire needs to be replaced, the driving assembly 130 drives the blanking clutch assembly 120 to be in transmission coupling with the blanking friction wheel 150, and drives the loading clutch assembly 140 to be in transmission separation with the loading friction wheel 160. The blanking friction wheel 150 can drive the tray 200 to rotate reversely, so that the wire is wound on the tray 200. In the process, the feeding clutch assembly 140 is separated from the feeding friction wheel 160 in a transmission way, and the feeding clutch assembly 140 does not obstruct the reverse rotation of the tray 200.

When the 3D printer needs to print a three-dimensional object, the driving assembly 130 drives the feeding clutch assembly 140 to be in transmission coupling with the feeding friction wheel 160, and drives the discharging clutch assembly 120 to be in transmission separation with the discharging friction wheel 150. The feeding friction wheel 160 may drag the wire 300 into the guide tube. In this process, the tray 200 rotates forward relative to the tray holder 400, and the blanking clutch assembly 120 does not obstruct the forward rotation of the tray 200.

It is understood that the driving assembly 130 may be implemented by providing a first motor and a second motor to drive the feeding clutch assembly 140 and the discharging clutch assembly 120, respectively, in some embodiments, and may be implemented by driving the motor 131 and the transmission shaft 132, in some embodiments.

In an example, the blanking clutch assembly 120 and the loading clutch assembly 140 are sleeved on the transmission shaft 132, so that the blanking clutch assembly 120 and the loading clutch assembly 140 can pivot along the circumferential direction of the transmission shaft 132 along with the rotation of the transmission shaft 132. The blanking clutch assembly 120 and the loading clutch assembly 140 are at an angle to each other in the circumferential direction of the transmission shaft 132 such that when the blanking clutch assembly 120 pivots in a first direction to a first position along the circumferential direction of the transmission shaft 132, the loading clutch assembly 140 pivots in the first direction to a third position, and when the blanking clutch assembly 120 pivots in a second direction opposite to the first direction to a second position along the circumferential direction of the transmission shaft 132, the loading clutch assembly 140 pivots in the second direction to a fourth position. Thus, only one drive motor 131 can be provided, simplifying the structure of the material feeding mechanism 100.

In some embodiments, the main body 110 of the material feeding mechanism 100 is further provided with a third position limiting portion 113 and a fourth position limiting portion 114. The feeding clutch assembly 140 can move between the third position-limiting portion 113 and the fourth position-limiting portion 114.

The third limiting portion 113 and the fourth limiting portion 114 may both protrude from the main body 110, and the specific implementation manner may refer to the structure of the first limiting portion 111. In the illustrated example, the first and second stoppers 111 and 112 protrude from a first wall surface 116 of the body 110, and the third and fourth stoppers 113 and 114 protrude from a second wall surface 117 of the body 110.

The third position-limiting portion 113 is positioned on a moving path of the feeding clutch assembly 140 relative to the main body 110, so that the feeding clutch assembly 140 is in a third position when moving to abut against the third position-limiting portion 113. The fourth position-limiting portion 114 is positioned on a moving path of the feeding clutch assembly 140 relative to the main body 110, so that the feeding clutch assembly 140 is in a fourth position when moving to abut against the fourth position-limiting portion 114. Referring to fig. 13, the third position-limiting portion 113 is disposed opposite to the second end (the end with the smaller size of the two ends of the second connecting member) of the second connecting member of the feeding clutch assembly 140 (the connecting member closer to the main body 110 of the two connecting members of the feeding clutch assembly 140), so that the left edge of the second end of the second connecting member can abut against the third position-limiting portion 113 when the feeding clutch assembly 140 is at the third position. The fourth position-limiting portion 114 is disposed opposite to the third position-limiting portion 113 with respect to the second end of the second connecting member of the feeding clutch assembly 140, so that when the feeding clutch assembly 140 is at the fourth position, the right edge of the second end of the second connecting member can abut against the third position-limiting portion 113. Herein, the relative spatial terms "left", "right" are used with reference to fig. 13 and 14, and should not be taken as limiting.

The following description will take an example in which the driving motor 131 rotates reversely to drive the transmission shaft 132 to rotate along the first direction, and the driving motor 131 rotates forward to drive the transmission shaft 132 to rotate along the second direction. Referring to fig. 6 and 13, when the driving motor 131 drives the blanking clutch assembly 120 to be coupled with the blanking friction wheel 150 in a transmission manner in a reverse rotation manner, the blanking clutch assembly 120 can abut against the first limiting portion 111, and the feeding clutch assembly 140 can abut against the third limiting portion 113. When the driving motor 131 continuously rotates reversely to drive the tray 200 to rotate reversely, the transmission shaft 132 continuously rotates along the first direction, and the third limiting portion 113 can overcome the resistance of the friction force between the first connecting piece and the first gear of the feeding clutch assembly 140, so that the feeding clutch assembly 140 is kept at the third position. This may reduce the travel path of loading clutch assembly 140, reducing unwanted movement of loading clutch assembly 140.

Referring to fig. 14, when the driving motor 131 rotates forward to drive the feeding clutch assembly 140 to be coupled with the feeding friction wheel 160 in a transmission manner, the feeding clutch assembly 140 may abut against the fourth limiting portion 114, and the discharging clutch assembly 120 may abut against the second limiting portion 112. When the driving motor 131 continues to rotate forward, the fourth position-limiting portion 114 may provide a resistance force to overcome a friction force between the first connecting member and the first gear of the feeding clutch assembly 140, so that the feeding clutch assembly 140 may be maintained at the fourth position, and the wire 300 is pulled by the feeding friction wheel 160. The contact force between the second gear and the second matching gear 161 can be reduced by arranging the fourth limiting part 114, the abrasion between the second gear and the second matching gear 161 is reduced, and the service life of the feeding clutch assembly 140 is prolonged. Meanwhile, the second position-limiting portion 112 may provide a resistance force against a friction force between the first connecting member 121 and the first gear 122 of the blanking clutch assembly 120, so that the blanking clutch assembly 120 may be maintained at the second position.

For a specific limiting manner of the third limiting portion 113 and the fourth limiting portion 114, reference may be made to the above description of the first limiting portion 111 and the second limiting portion 112, which is not described herein again.

The disclosed embodiment also provides a multiple material unit, comprising at least one tray 200 and at least one material feeding mechanism 100. At least one tray 200 is respectively wound with at least one wire 300 for a 3D printer. The at least one material feed mechanism 100 is for use with a respective tray 200 of the at least one tray 200 to feed the 3D printer with at least one wire 300.

It will be appreciated that the multiple material unit may comprise a housing and at least one material feed module(s) disposed in the housing, each of which may have disposed therein one tray 200 and one material feed mechanism 100. I.e., the number of material feeding mechanisms 100 and trays 200 in the multi-unit is one-to-one, one tray 200 can be wound with one wire 300 and equipped with one material feeding mechanism 100. In an example, each tray 200 can also be equipped with one tray holder 400. In addition, a material guide pipe for guiding the wires towards the hot end of the 3D printer may be arranged on the box body of the multiple material unit in a penetrating manner, that is, one material guide pipe may be shared by multiple material feeding units.

The structure and function of the material feeding mechanism 100 are the same as those of the above-described embodiment, and will not be described again.

The embodiment of the disclosure further provides a 3D printing system, which comprises a 3D printer and a multi-material unit. The multi-feed unit is used to feed the wire 300 to the 3D printer. The 3D printer has hot junction and print motor, and print motor can be used for dragging wire rod 300 in the passage when printing, and carry it to the hot junction. The hot end may heat and melt the wire 300, and the 3D printer may build the build material formed after the wire is melted into a three-dimensional object layer by layer.

As described above, the multi-feed unit may include at least one tray 200 and at least one material feed mechanism 100. At least one tray 200 is respectively wound with at least one wire 300 for a 3D printer. The at least one material feed mechanism 100 is for use with a respective tray 200 of the at least one tray 200 to feed the 3D printer with at least one wire 300.

As described above, each material feeding mechanism 100 includes the main body 110, the blanking clutch assembly 120 connected to the main body 110, and the driving assembly 130. The driving assembly 130 is configured to drive the discharging clutch assembly 120 to be switchable between a first position relative to the main body 110, at which the discharging clutch assembly 120 is drivingly coupled with a corresponding tray 200 of the at least one tray 200, so as to rotate the corresponding tray 200 under the driving of the driving assembly 130 to wind the corresponding wire 300 of the at least one wire 300 around the corresponding tray 200, and a second position relative to the main body 110, at which the discharging clutch assembly 120 is drivingly separated from the corresponding tray 200.

In some embodiments, each material feed mechanism 100 further includes a feed clutch assembly 140 connected to the body 110. The driving assembly 130 is further configured to drive the feeding clutch assembly 140 to be switchable between a third position with respect to the main body 110, where the feeding clutch assembly 140 is drivingly separated from the corresponding wire 300, and a fourth position with respect to the main body 110, where the feeding clutch assembly 140 is drivingly coupled with the corresponding wire 300 to pull the corresponding wire 300 to be released from the corresponding tray 200 under the driving of the driving assembly 130.

The specific structure and function of the multiple material unit and the material feeding mechanism 100 can refer to the above-mentioned embodiments, and are not described herein.

In some embodiments, the drive assembly 130 may also be configured to perform the following operations in each material feed mechanism 100 of a multi-feed unit of a 3D printing system.

When the material feed mechanism 100 is operated for blanking, the drive assembly 130 drives the blanking clutch assembly 120 to move to the first position and the loading clutch assembly 140 to move to the third position.

"blanking" may occur when printing is complete or when the wire needs to be replaced, which may be understood as the process of withdrawing the wire 300 from the guide tube and rewinding it onto the tray 200. During discharging, the driving assembly 130 drives the discharging clutch assembly 120 to be coupled with the discharging friction wheel 150 in a transmission manner, and drives the feeding clutch assembly 140 to be separated from the feeding friction wheel 160 in a transmission manner. The blanking friction wheel 150 can drive the tray 200 to rotate reversely, so that the wire is wound on the tray 200. In the process, the feeding clutch assembly 140 is separated from the feeding friction wheel 160 in a transmission way, and the feeding clutch assembly 140 does not obstruct the reverse rotation of the tray 200.

When the material feeding mechanism 100 is operated for feeding, the driving assembly 130 drives the blanking clutch assembly 120 to move to the second position and drives the feeding clutch assembly 140 to move to the fourth position.

"feeding" is understood to mean the process in which the multi-feed unit delivers the wire 300 required for printing to the guide tube. During feeding, the driving assembly 130 drives the feeding clutch assembly 140 to be coupled with the feeding friction wheel 160 in a transmission manner, and drives the discharging clutch assembly 120 to be separated from the discharging friction wheel 150 in a transmission manner. The feeding friction wheel 160 can drag the wire 300 into the material guiding pipe, and during the process of dragging the wire 300, the material tray 200 rotates forwards relative to the material tray support 400, and the blanking clutch assembly 120 does not block the forward rotation of the material tray 200.

When the material feed mechanism 100 has been operated for feeding for printing by the 3D printer, the drive assembly 130 holds the blanking clutch pack 120 in the second position, holds the feeding clutch assembly 140 in the fourth position, and turns off the drive assembly 130.

The "printing" can be understood as a process that a printing motor in the 3D printer drags the wire 300 in the feeding pipe and conveys the wire to the hot end of the 3D printer. During printing, the driving assembly 130 may drive the feeding clutch assembly 140 to be drivingly coupled to the feeding friction wheel 160, drive the discharging clutch assembly 120 to be drivingly decoupled from the discharging friction wheel 150, and then stop the driving assembly 130, for example, the power of the driving motor 131 may be turned off. Referring to fig. 11 and 14, the wire 300 may continue to move in the direction of the arrow in fig. 11 (the direction from right to left in fig. 14) due to the driving of the printing motor, and the driving force applied to the wire 300 by the printing motor may simultaneously drive the feeding friction wheel 160 to rotate in the clockwise direction in fig. 14, so as to drive the coaxial second mating gear 161 to rotate in the clockwise direction in fig. 14. The second mating gear 161 may apply a driving force to the second gear of the feeding clutch assembly 140 to rotate in a counterclockwise direction with respect to the transmission shaft 132, so that the second gear may be kicked open, the feeding clutch assembly 140 is in transmission separation with the second mating gear 161, and the feeding clutch assembly 140 may be located between the third position and the fourth position. Since the drive assembly 130 is deactivated and the drive shaft 132 does not rotate, the feed clutch assembly 120 can remain in the second position. The 3D printer can continue to perform printing operations, and neither the feeding clutch assembly 140 nor the discharging clutch assembly 120 affects the normal operation of the printing motor.

It is understood that, during printing, the feeding clutch assembly 140 can be located between the third position defined by the third position-limiting portion 113 and the fourth position defined by the fourth position-limiting portion 114 after being kicked away. When the 3D printing system is being re-blanked, the loading clutch assembly 140 may rotate in the first direction following the drive shaft 132 to assume a third position, at which time the unloading clutch assembly 120 moves from the second position to a position somewhere between the first position and the second position. When the transmission shaft 132 continues to rotate in the first direction, the blanking clutch assembly 120 can be rested against the first position-limiting portion 111, that is, the blanking clutch assembly 120 is located at the first position. The transmission shaft 132 continues to rotate in the first direction, and the feeding tray 200 is driven to rotate reversely by the feeding clutch assembly 120, so as to wind the wire 300 around the feeding tray 200.

Similarly, when the 3D printing system is reloaded, the loading clutch assembly 140 may rotate in the second direction following the transmission shaft 132, and thus be in the fourth position. The blanking clutch assembly 120 may be positioned between the first position and the second position at this time. When the transmission shaft 132 continues to rotate in the second direction to drag the wire 300 to be fed, the feeding clutch assembly 120 can be rested against the second position-limiting portion 112, i.e. located at the second position.

In some embodiments, in the printing operation, the rotation angle of the driving motor 131 can be adjusted, so that the blanking clutch assembly 120 is located between the first position and the second position, and the feeding clutch assembly 140 is located between the third position and the fourth position. The specific angle can be set according to actual conditions.

According to the multi-material unit and the 3D printing system provided by the embodiment of the disclosure, by providing the blanking clutch assembly 120 and the driving assembly on the main body 110 of the material feeding mechanism 100, the driving assembly 130 can drive the blanking clutch assembly 120 to switch between the first position relative to the main body 110 and the second position relative to the main body 110. In the first position, the blanking clutch assembly 120 is in transmission coupling with the tray 200, and the tray 200 can be rotated under the driving of the driving assembly 130, so that the wire 300 is wound on the tray 200, thereby preventing the wire 300 from being suspended or accumulated in the material feeding mechanism 100 after blanking, and improving the reliability and tidiness of the multi-material unit. And the blanking clutch assembly 120 is separated from the material tray 200 at the second position in a transmission way, so that the 3D printing system can normally print the three-dimensional object.

While the disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative and exemplary and not restrictive; the present disclosure is not limited to the disclosed embodiments. Variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed subject matter, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps not listed, the indefinite article "a" or "an" does not exclude a plurality, and the term "a plurality" means two or more. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

List of reference numerals:

100: a material feeding mechanism; 110: a main body;

111: a first limiting part; 112: a second limiting part;

113: a third limiting part; 114: a fourth limiting part;

115: a wire support frame; 116: a first wall surface;

117: a second wall surface; 120: a blanking clutch component;

121: a first connecting member; 1211: a first groove;

1212: a first end; 1213: a second end;

122: a first gear; 123: a second gear;

124: a second connecting member; 1241: a second groove;

125: an elastic member; 1251: an elastic member body;

1252: a first jaw; 1252 a: first bump

1253: a second jaw; 1253 a: a second protrusion;

130: a drive assembly; 131: a drive motor;

132: a drive shaft; 133: a baffle plate;

134: a worm gear; 135: a worm;

140: a feeding clutch assembly; 150: blanking friction wheels;

151: a first mating gear; 160: a feeding friction wheel;

161: a second mating gear; 200: a material tray;

210: a flange; 300: a wire rod;

400: a tray support.