阅读说明：本技术 一种下拖轮机构 (Lower tug mechanism ) 是由 蔡国源 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种下拖轮机构,包括：滚轮组件,用于设置在缝纫机的工作台下方,并且所述滚轮组件的圆周面能够凸出所述缝纫机的工作台的上表面；连杆驱动机构,所述连杆驱动机构至少包括摆动连杆,所述摆动连杆用于与摆动驱动部件连接并且能够由摆动驱动部件带动往复摆动；单向传动机构,所述单向传动机构至少包括单向转轮组件,所述单向转轮组件能够朝设定方向单向旋转,所述单向转轮组件与所述连杆驱动机构连接,所述摆动连杆朝正向摆动或反向摆动的状态下带动所述单向转轮组件旋转,所述滚轮组件与所述单向传动机构连接以使得所述滚轮组件能够跟随所述单向转轮组件同步转动。本发明可以提升缝纫机送料的稳定性。(The invention discloses a lower tug mechanism, which comprises: the roller assembly is arranged below a workbench of the sewing machine, and the circumferential surface of the roller assembly can protrude out of the upper surface of the workbench of the sewing machine; the connecting rod driving mechanism at least comprises a swinging connecting rod, and the swinging connecting rod is connected with the swinging driving part and can be driven by the swinging driving part to swing in a reciprocating manner; the one-way transmission mechanism at least comprises one-way rotating wheel assemblies, the one-way rotating wheel assemblies can rotate in one direction towards a set direction, the one-way rotating wheel assemblies are connected with the connecting rod driving mechanism, the swinging connecting rod drives the one-way rotating wheel assemblies to rotate in a forward swinging or reverse swinging state, and the roller assemblies are connected with the one-way transmission mechanism so that the roller assemblies can rotate synchronously along with the one-way rotating wheel assemblies. The invention can improve the feeding stability of the sewing machine.)

1. A lower tug mechanism, comprising:

the roller assembly is arranged below a workbench of the sewing machine, and the circumferential surface of the roller assembly can protrude out of the upper surface of the workbench of the sewing machine;

the connecting rod driving mechanism at least comprises a swinging connecting rod, and the swinging connecting rod is connected with the swinging driving part and can be driven by the swinging driving part to swing in a reciprocating manner;

the one-way transmission mechanism at least comprises one-way rotating wheel assemblies, the one-way rotating wheel assemblies can rotate in one direction towards a set direction, the one-way rotating wheel assemblies are connected with the connecting rod driving mechanism, the swinging connecting rod drives the one-way rotating wheel assemblies to rotate in a forward swinging or reverse swinging state, and the roller assemblies are connected with the one-way transmission mechanism so that the roller assemblies can rotate synchronously along with the one-way rotating wheel assemblies.

2. The bottom tug mechanism of claim 1, wherein the link driving mechanism further comprises a transmission link and a first pin, the transmission link is connected with the one-way transmission mechanism, the swinging link is provided with a kidney-shaped hole along the length direction thereof, the first pin is inserted into the kidney-shaped hole and movably matched with the kidney-shaped hole, the first pin is inserted with a positioning structure, the positioning structure is used for positioning the first pin in the kidney-shaped hole, and the transmission link is rotatably connected with the first pin.

3. The lower tug mechanism of claim 2 wherein said positioning structure comprises a projection disposed on said first pin and a tightening nut threadably coupled to said first pin, said tightening nut and projection being located on either side of said swing link, said tightening nut and projection clamping said swing link in a tightened condition such that said first pin is positioned in said kidney-shaped hole.

4. The bottom tug mechanism of claim 2 wherein the drive linkage comprises a first drive linkage and a second drive linkage, the first drive linkage and the second drive linkage being rotationally coupled by a second pin, the first drive linkage being rotationally coupled to the first pin, the second pin being fixedly coupled to the one-way drive shaft, the one-way wheel assembly being mounted on the one-way drive shaft.

5. The bottom tug mechanism of claim 1 wherein the linkage drive mechanism further comprises a drive linkage, the one-way drive mechanism further comprising a one-way drive shaft, the one-way wheel assembly being mounted on the one-way drive shaft, the drive linkage having a first end rotationally coupled to the swing linkage and a second end fixedly coupled to the one-way drive shaft.

6. The tug mechanism of claim 5 wherein the one-way swivel assembly comprises a first pulley and a one-way bearing, the first pulley being mounted on the one-way bearing, the one-way bearing being mounted on a one-way drive shaft.

7. The bottom tug mechanism of claim 6 further comprising a second pulley and a drive belt, the drive belt being connected to the first pulley and the second pulley, the second pulley being mounted on a roller mounting shaft on which the roller assembly is mounted.

8. The bottom tug mechanism of claim 1 wherein said roller assembly comprises a plurality of rollers mounted side-by-side on a roller mounting axle, said one-way transmission being connected to said roller mounting axle.

9. The bottom tug mechanism of claim 8 wherein the surface of the roller is soft.

10. The lower tug mechanism of claim 7 wherein the first and second pulleys are synchronous pulleys and the drive belt is a synchronous belt.

Technical Field

The invention relates to the technical field of sewing machines, in particular to a lower tug mechanism.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. And derives the artistic forms of hand-push embroidery, computer embroidery, etc.

The sewing machine is composed of four parts of machine head, machine base, transmission and accessories. The head is an essential part of the sewing machine. The sewing machine consists of four mechanisms of material needling, thread hooking, thread picking and feeding, auxiliary mechanisms of winding, material pressing, tooth falling and the like, and the motion of the mechanisms is reasonably matched and works circularly to sew up sewing materials. The machine base is divided into two forms of a bedplate and a machine box. The table of the table type machine base plays a role of supporting the machine head and is used as a working table during sewing operation.

The feeding mechanism in the prior art cannot realize the synchronization of feeding, and especially when large-area fabrics are processed, the feeding of the fabrics is unstable.

Disclosure of Invention

The invention provides a lower tug mechanism which can improve the feeding stability of a sewing machine.

In order to solve the above technical problem, the present invention provides a tow boat lowering mechanism, comprising:

the roller assembly is arranged below a workbench of the sewing machine, and the circumferential surface of the roller assembly can protrude out of the upper surface of the workbench of the sewing machine;

the connecting rod driving mechanism at least comprises a swinging connecting rod, and the swinging connecting rod is connected with the swinging driving part and can be driven by the swinging driving part to swing in a reciprocating manner;

the one-way transmission mechanism at least comprises one-way rotating wheel assemblies, the one-way rotating wheel assemblies can rotate in one direction towards a set direction, the one-way rotating wheel assemblies are connected with the connecting rod driving mechanism, the swinging connecting rod drives the one-way rotating wheel assemblies to rotate in a forward swinging or reverse swinging state, and the roller assemblies are connected with the one-way transmission mechanism so that the roller assemblies can rotate synchronously along with the one-way rotating wheel assemblies.

Preferably, the connecting rod driving mechanism further comprises a transmission connecting rod and a first pin shaft, the transmission connecting rod is connected with the one-way transmission mechanism, a waist-shaped hole is formed in the swing connecting rod along the length direction of the swing connecting rod, the first pin shaft is inserted into the waist-shaped hole and movably matched with the waist-shaped hole, a positioning structure is arranged on the first pin shaft in an inserted mode, the positioning structure is used for positioning the first pin shaft in the waist-shaped hole, and the transmission connecting rod is rotatably connected with the first pin shaft.

Preferably, as for the above technical solution, the positioning structure includes a protruding block and a fastening nut, the protruding block is disposed on the first pin, the fastening nut is in threaded connection with the first pin, the fastening nut and the protruding block are respectively located on two sides of the swing link, and in a tightened state of the fastening nut, the fastening nut and the protruding block clamp the swing link so that the first pin is positioned in the kidney-shaped hole.

Preferably, the transmission connecting rod comprises a first transmission connecting rod and a second transmission connecting rod, the first transmission connecting rod and the second transmission connecting rod are rotatably connected through a second pin shaft, the first transmission connecting rod is rotatably connected with the first pin shaft, the second pin shaft is fixedly connected with the unidirectional transmission shaft, and the unidirectional rotating wheel assembly is arranged on the unidirectional transmission shaft.

Preferably, the connecting rod driving mechanism further comprises a transmission connecting rod, the unidirectional transmission mechanism further comprises a unidirectional transmission shaft, the unidirectional rotating wheel assembly is mounted on the unidirectional transmission shaft, a first end of the transmission connecting rod is rotatably connected with the swinging connecting rod, and a second end of the transmission connecting rod is relatively fixedly connected with the unidirectional transmission shaft.

Preferably, the unidirectional rotating wheel assembly comprises a first belt pulley and a unidirectional bearing, the first belt pulley is mounted on the unidirectional bearing, and the unidirectional bearing is mounted on the unidirectional transmission shaft.

Preferably, as above-mentioned technical scheme, one-way drive mechanism still includes second belt pulley and driving belt, driving belt with first belt pulley and second belt pulley are connected, the second belt pulley is installed on the roller installation axle, the roller subassembly is installed on the roller installation axle.

Preferably, the roller assembly includes a plurality of rollers, the plurality of rollers are mounted on the roller mounting shaft side by side, and the unidirectional transmission mechanism is connected with the roller mounting shaft.

Preferably, in the above technical solution, the surface of the roller is made of a soft material.

Preferably, in the above technical solution, the first pulley and the second pulley are synchronous pulleys, and the transmission belt is a synchronous belt.

The invention provides a lower tug mechanism, which comprises a roller component, a connecting rod driving mechanism and a one-way transmission mechanism, wherein the roller component is arranged below a workbench of a sewing machine, the circumferential surface of the roller component can protrude out of the upper surface of the workbench of the sewing machine, the roller component can be contacted with the lower surface of a fabric, the connecting rod driving mechanism comprises a swinging connecting rod, the swinging connecting rod is connected with a swinging driving part and can be driven by the swinging driving part to swing in a reciprocating way, the one-way transmission mechanism comprises a one-way rotating wheel component, the one-way rotating wheel component can rotate in one way towards a set direction, the one-way rotating wheel component is connected with the connecting rod driving mechanism, the swinging connecting rod drives the one-way rotating wheel component to rotate towards a positive swinging state or a reverse swinging state, the roller component is connected with the one-way transmission mechanism so that the roller component can rotate synchronously along with the one-way rotating wheel component, the lower tug mechanism can work in cooperation with the upper tug mechanism, specifically, the roller component is in contact with the lower surface of the fabric, the swinging driving component drives the swinging connecting rod to swing, the unidirectional rotating wheel component is driven to rotate towards one direction in the swinging process, the unidirectional rotating wheel component cannot be driven to rotate reversely when the swinging connecting rod swings back, the roller component is driven to move to feed when the unidirectional rotating wheel component rotates every time, the needle rod does not carry out sewing work in the feeding process, the roller component does not move when the swinging connecting rod swings back, and the fabric stays still in the process and is sewn by the needle rod.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

FIG. 1 is a schematic view showing a structure of a sewing machine according to an embodiment of the present invention;

FIG. 2 is a schematic view showing a connection structure of a lower tug mechanism and a swing driving part in the embodiment of the invention;

FIG. 3 is a schematic perspective view of a lower tug mechanism according to an embodiment of the invention;

FIG. 4 is a schematic perspective view of a link drive mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic view showing a coupling structure of a swing link in the embodiment of the present invention;

in the figure: 10. a lower tug mechanism; 20. a machine head; 30. a work table; 40. a swing driving member; 101. a roller assembly; 102. a drive belt; 104. mounting a bracket; 105. a roller wheel mounting shaft; 106. a unidirectional transmission shaft; 107. a second pin shaft; 108. a second drive link; 109. a first pin shaft; 111. a swing link; 112. a kidney-shaped hole; 113. a first drive link; 114. a one-way bearing; 115. a first pulley; 116. a second pulley; 117. fastening a nut; 118. a bump; 120. a one-way transmission mechanism; 130. a one-way transmission mechanism; 301. and (4) opening.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 5, an embodiment of the present invention provides a sewing machine including a head 20 and a table 30, a lower tug mechanism 10 is provided below the table 30, and an upper tug mechanism (not shown) is provided above the table 30.

The embodiment provides a tow boat mechanism down, includes:

a roller assembly 101 for being disposed under the table 30 of the sewing machine, and a circumferential surface of the roller assembly 101 can protrude an upper surface of the table 30 of the sewing machine;

the connecting rod driving mechanism 130, the connecting rod driving mechanism 130 includes at least a swing connecting rod 111, the swing connecting rod 111 is used for connecting with the swing driving component 40 and can be driven by the swing driving component 40 to swing reciprocally;

the unidirectional transmission mechanism 120, the unidirectional transmission mechanism 120 includes the unidirectional wheel subassembly at least, the unidirectional wheel subassembly can be towards setting for the unidirectional rotation of direction, the unidirectional wheel subassembly is connected with the connecting rod drive mechanism 130, the swing connecting rod 111 drives the unidirectional wheel subassembly to rotate under the state of forward swing or reverse swing, the roller subassembly 101 is connected with the unidirectional transmission mechanism 120 so that the roller subassembly 101 can follow the synchronous rotation of unidirectional wheel subassembly.

The embodiment provides a lower tug mechanism, which comprises a roller assembly 101, a connecting rod driving mechanism 130 and a one-way transmission mechanism 120, wherein the roller assembly 101 is arranged below a workbench 30 of a sewing machine, the circumferential surface of the roller assembly 101 can protrude out of the upper surface of the workbench 30 of the sewing machine, the roller assembly 101 can be contacted with the lower surface of a first fabric, the roller of the upper tug mechanism is contacted with the upper surface of a second fabric, the connecting rod driving mechanism 130 comprises a swinging connecting rod 111, the swinging connecting rod 111 is connected with a swinging driving part 40 and can be driven by the swinging driving part to swing in a reciprocating manner, the one-way transmission mechanism 120 comprises a one-way rotating wheel assembly, the one-way rotating wheel assembly can rotate in a single direction towards a set direction, the one-way rotating wheel assembly is connected with the connecting rod driving mechanism 130, the swinging connecting rod 111 drives the one-way rotating wheel assembly to rotate towards a forward swinging state or a reverse swinging state, the roller assembly 101 is connected with the unidirectional transmission mechanism 120 so that the roller assembly 101 can rotate synchronously with the unidirectional roller assembly, the lower roller mechanism of the embodiment can work synchronously with the upper roller mechanism, specifically, the roller assembly 101 is in contact with the lower surface of the first fabric, the swing driving component 40 drives the swing connecting rod to swing, the unidirectional roller assembly is driven to rotate towards one direction in the swinging process, the unidirectional roller assembly cannot be driven to rotate reversely when the swing connecting rod swings backwards, the roller assembly 101 is driven to move for feeding when the unidirectional roller assembly rotates every time, the needle rod does not carry out sewing work in the feeding process, the roller assembly 101 is not moved when the swing connecting rod 111 swings backwards, the fabric stays still in the process and finishes sewing work by the needle rod, and the lower roller mechanism and the upper roller mechanism work are matched to enable two layers of fabrics to move synchronously in the embodiment, the stability of pay-off has been improved.

The working table 30 in this embodiment is provided with an opening 301 to allow the roller assembly 101 to protrude from the upper surface of the working table 30, and the swing driving member 40 in this embodiment is a swing shaft which can swing back and forth, and the swing link 111 is fixed to the swing shaft and the swing link 111 is driven by the swing shaft to swing.

In a further implementation manner of this embodiment, the link driving mechanism 130 further includes a transmission link and a first pin 109, the transmission link is connected to the one-way transmission mechanism 120, a waist-shaped hole 112 is formed in the swing link 111 along the length direction thereof, the first pin 109 is inserted into the waist-shaped hole 112 and movably engaged with the waist-shaped hole 112, a positioning structure is disposed on the first pin 109, the positioning structure is configured to position the first pin in the waist-shaped hole 112, and the transmission link is rotatably connected to the first pin.

In this embodiment, the swing link 111 drives the transmission link to further drive the one-way transmission mechanism 120, and the first pin 109 in this embodiment is disposed in the kidney-shaped hole 112, so that a connection point between the transmission link and the swing link 111 can be adjusted, and further, a rotation angle of the roller assembly 101 during each swing process can be adjusted by adjusting a swing amplitude, so as to adjust a feeding speed of the lower tug mechanism to be consistent with a speed of the upper tug mechanism.

In a further implementation manner of the present embodiment, the positioning structure includes a protrusion 118 and a fastening nut 117, the protrusion 118 is disposed on the first pin 109, the fastening nut 117 is in threaded connection with the first pin 109, the fastening nut 117 and the protrusion 118 are respectively located on two sides of the swing link 111, and when the fastening nut 117 is tightened, the fastening nut 117 and the protrusion 118 clamp the swing link 111 so that the first pin 109 is positioned in the kidney-shaped hole 112.

The positioning structure in this embodiment is not only simple in structure but also facilitates the adjustment of the first pin shaft 109, and the first pin shaft 109 is positioned more firmly.

In a further implementation manner of this embodiment, the transmission link includes a first transmission link 113 and a second transmission link 108, the first transmission link 113 and the second transmission link 108 are rotatably connected by a second pin 107, the first transmission link 113 is rotatably connected with the first pin 109, the second pin 107 is fixedly connected with the one-way transmission shaft 106, and the one-way rotating wheel assembly is mounted on the one-way transmission shaft 106.

The transmission link in this embodiment includes the first transmission link 113 and the second transmission link 108, so that it is more convenient to adjust the connection position between the first pin 109 and the swing link 111.

In a further implementation manner of this embodiment, the link driving mechanism 130 further includes a transmission link, the unidirectional transmission mechanism 120 further includes a unidirectional transmission shaft 106, the unidirectional rotating wheel assembly is mounted on the unidirectional transmission shaft 106, a first end of the transmission link is rotatably connected to the swinging link 111, and a second end of the transmission link is relatively fixedly connected to the unidirectional transmission shaft 106.

The link driving mechanism 130 in the present embodiment has a simple structure and is stably driven.

In a further alternative embodiment of this embodiment, the unidirectional rotating wheel assembly comprises a first pulley 115 and a unidirectional bearing 114, the first pulley 115 is mounted on the unidirectional bearing 114, and the unidirectional bearing 114 is mounted on the unidirectional transmission shaft 106.

The unidirectional rotating wheel assembly in this embodiment has a simple structure, and the unidirectional rotation of the first pulley 115 is more stable.

In a further implementation manner of the present embodiment, the one-way transmission mechanism 120 further includes a second pulley 116 and a transmission belt 102, the transmission belt 102 is connected to the first pulley 115 and the second pulley 116, the second pulley 116 is mounted on the roller mounting shaft 105, and the roller assembly 101 is mounted on the roller mounting shaft 105.

The transmission of the embodiment is more stable through the belt and the belt pulley, and the structure is simple and reliable.

In a further implementation manner of the present embodiment, the roller assembly 101 includes a plurality of rollers, the plurality of rollers are mounted on the roller mounting shaft 105 side by side, and the one-way transmission mechanism 120 is connected with the roller mounting shaft 105.

The roller assembly 101 structure in this embodiment further improves the feeding stability.

In a further implementation manner of the present embodiment, the surface of the roller is made of a soft material.

The surface of the roller in the embodiment is made of soft materials, so that friction can be increased, feeding stability can be improved, and the surface of the fabric can be prevented from being scratched.

In a further possible implementation of this embodiment, the first pulley 115 and the second pulley 116 are synchronous pulleys and the transmission belt 102 is a synchronous belt.

The first pulley 115 and the second pulley 116 in this embodiment are synchronous pulleys, and the driving belt 102 is a synchronous belt, so that the driving stability can be further improved.

The worktable 30 in this embodiment is provided with a mounting bracket 104, and a one-way transmission shaft 106 is rotatably mounted on the mounting bracket 104.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.