阅读说明：本技术 一种合拢包边一次成形的缝纫机 (Sewing machine with one-step formed folded edge covering ) 是由 王建峰 于 2020-05-18 设计创作，主要内容包括：本发明涉及合拢包边一次成形的缝纫机,包括送料单元、缝合单元和包边器,其中送料单元包括送料平台、送料牙、以及送料驱动器,缝合单元包括压脚、机针、机梭、以及机针驱动器,压脚上设有两个相错开的第一、二针孔,第一、二针孔一前一后且一左一右分布,机针和机梭一一对应并分成两组,一组用于缝料的合拢,另一组用于缝料的包边,其中在缝料自前向后缝合中,合拢用的机针自第一针孔穿过将缝料的侧边缝合,包边用的机针穿过第二针孔并将合拢后缝料与包边条缝合,前部合拢后部包边两者互不干扰,同时合拢和包边用的机针能够随着缝料前行缝合中同步且一次完成缝料侧边的合拢和包边的缝合,不仅缝合效率高,而且大幅度降低缝合成本。(The invention relates to a sewing machine for once forming folded hems, which comprises a feeding unit, a sewing unit and a hemmer, wherein the feeding unit comprises a feeding platform, feeding teeth and a feeding driver, the sewing unit comprises a presser foot, a needle, a shuttle and a needle driver, the presser foot is provided with a first needle hole and a second needle hole which are staggered, the first needle hole and the second needle hole are distributed in a front-back manner and a left-right manner, the needle and the shuttle are in one-to-one correspondence and are divided into two groups, one group is used for folding a sewing material, the other group is used for hemming the sewing material, in the sewing process of sewing the sewing material from front to back, the needle for folding penetrates through the first needle hole to sew the side edge of the sewing material, the needle for hemming penetrates through the second needle hole and sews the folded sewing material and a hemmer, the two groups of the front folded and back hemmers are not interfered with each other, and the needles for folding and hemming can synchronously finish the folding and hemming of the side edge of, not only has high sewing efficiency, but also greatly reduces the sewing cost.)

1. A sewing machine for once forming folded edge, comprising:

the feeding unit comprises a feeding platform, feeding teeth and a feeding driver, wherein the feeding teeth push the sewing materials from front to back in the movement process;

a sewing unit including a presser foot, a needle, a shuttle, and a needle driver,

the method is characterized in that:

the sewing machine also comprises a taping device which can wrap the edge wrapping strip on the side edge of the sewing material and automatically feed the edge wrapping strip into the space between the presser foot and the feeding tooth,

the presser foot is provided with a first needle hole and a second needle hole which are staggered, the first needle hole and the second needle hole are distributed in tandem and left-right, the machine needles and the machine shuttle are in one-to-one correspondence and divided into two groups, one group is used for folding the sewing material, the other group is used for wrapping the sewing material, in the process of sewing the sewing material from front to back, the machine needle for folding penetrates through the first needle hole to sew the side edge of the sewing material, the machine needle for wrapping penetrates through the second needle hole to sew the folded sewing material and the wrapping strip, and the machine needle for folding and wrapping can synchronously finish folding and wrapping sewing of the side edge of the sewing material at one time along with the forward sewing of the sewing material.

2. The sewing machine for once forming of folded hems according to claim 1, characterized in that: the needles used for folding and edge covering are respectively fixed on a needle clamp through fastening screws, and the needle driver is used for driving the needle clamp to move up and down so as to drive the two needles to do shuttle motion synchronously.

3. The sewing machine for once forming of folded hems according to claim 1, characterized in that: the presser foot comprises a large presser foot and a small presser foot, wherein the large presser foot is positioned behind the small presser foot and can be pressed on the feeding platform, and the first needle holes and the second needle holes are distributed on the small presser foot and can be pressed on the feeding teeth.

4. The sewing machine for once forming of folded hems according to claim 1, characterized in that: the discharging end part of the edge covering device is correspondingly distributed between the folding needle and the edge covering needle and is positioned on the right side of the edge covering needle.

5. The sewing machine for once forming of folded hems according to claim 4, wherein: the ware of borduring transversely extends the setting from the left hand right side, ejection of compact tip is located the left end of ware of borduring, and ejection of compact terminal surface inclines to set up from the left hand right side.

6. A sewing machine with one-shot forming of a folded hem according to any one of claims 1 to 5, characterized in that: the binding device is linked with the feeding teeth, and when the feeding teeth move horizontally backwards, the binding device is folded towards the left side around the needle for binding and then the sewing material deflects; when the feeding teeth horizontally reset forwards, the edge covering device deflects around the needle for edge covering and resets.

7. The sewing machine for once forming of folded hems according to claim 6, wherein: the edge covering device comprises a device body and an external connecting piece, wherein the edge covering strip is gradually folded in half and can cover the side surface and the bottom surface of the folded sewing material, and the external connecting piece is used for positioning the device body.

8. The sewing machine for once forming a folded edge according to claim 7, wherein: a C-shaped cavity is formed in the end face of the presser body, a C-shaped opening is formed in the inner wall of the C-shaped cavity, an avoiding notch capable of avoiding the deflection of the left end of the presser body is formed in the feeding platform, the presser body is inserted into the upper surface and the lower surface of the presser foot from the left end of the C-shaped opening, and the presser foot can be arranged between the C-shaped openings in a lifting adjusting mode; the external connecting piece is pivoted on the feeding tooth from one end part and is connected on a base of the sewing machine in a free rotating mode from the other end part.

9. The sewing machine for once forming a folded edge according to claim 8, wherein: the external piece comprises a first connecting plate and a second connecting plate which rotate from one end part and are in sliding connection, wherein the first connecting plate rotates from the other end part to be connected to the base of the sewing machine, the other end part of the second connecting plate is in rotating connection with the feeding tooth, and the device body is fixed on the second connecting plate.

10. The sewing machine for once forming a folded hem according to claim 8 or 9, wherein: one of the external connecting piece and the feeding tooth forms a spherical joint, and the other one forms a pivoting groove matched with the spherical joint.

Technical Field

The invention belongs to the field of sewing machine products, and particularly relates to a sewing machine with a folded edge formed at one time.

Background

At present, in the field of sewing machines, folding and edge covering are two different processes, so that two sewing machines are required to be adopted for front and rear process operation, and therefore, the production efficiency of products is low, and the production cost (including equipment, manpower and the like) is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an improved sewing machine for one-step forming of folded edges.

In order to solve the technical problems, the invention adopts the following technical scheme:

a sewing machine for once forming folded edge, comprising:

the feeding unit comprises a feeding platform, feeding teeth and a feeding driver, wherein the feeding teeth push the sewing materials from front to back in the movement process;

a sewing unit including a presser foot, a needle, a shuttle, and a needle driver,

in particular, the sewing machine also comprises a hemmer which can wrap the edge wrapping strip on the side edge of the sewing material and automatically feed the edge wrapping strip into the space between the presser foot and the feeding tooth,

the presser foot is provided with a first needle hole and a second needle hole which are staggered, the first needle hole and the second needle hole are distributed in a front-back and left-right mode, the machine needles and the machine shuttles are in one-to-one correspondence and divided into two groups, one group is used for folding the sewing material, the other group is used for wrapping the sewing material, in the process of sewing the sewing material from front to back, the machine needle for folding penetrates through the first needle hole to sew the side edge of the sewing material, the machine needle for wrapping penetrates through the second needle hole and sews the folded sewing material and the wrapping strip, and the machine needle for folding and wrapping can synchronously complete folding and wrapping sewing of the side edge of the sewing material and wrapping at one time in the process of sewing the sewing material forward.

Preferably, needles used for folding and edge covering are respectively fixed on the needle clamp through fastening screws, and the needle driver is used for driving the needle clamp to move up and down so as to drive the two needles to move in a shuttling mode synchronously. On one hand, the folding and the edge covering synchronous sewing are convenient to implement; on the other hand, the needle is convenient to replace, and the single function of folding or edge covering is convenient to implement.

According to a specific implementation and preferred aspect of the invention, the presser foot comprises a large presser foot and a small presser foot, wherein the large presser foot is located behind the small presser foot and can be pressed on the feeding platform, and the first needle holes and the second needle holes are distributed on the small presser foot and can be pressed on the feeding tooth. Through the arrangement of the large presser foot and the small presser foot, the sewing material can be conveniently horizontally pushed, and the folding and edge-covering sewing are more facilitated.

Preferably, the discharge end of the binding device is correspondingly distributed between the folding needle and the binding needle and is positioned on the right side of the binding needle.

Preferably, the edge covering device transversely extends from left to right, the discharge end part is positioned at the left end of the edge covering device, and the discharge end surface is obliquely arranged from left to right, so that the edge covering belt is convenient to turn, and the edge covering device is favorable for covering the side edges.

According to a further embodiment and preferred aspect of the present invention, the binding device is provided in conjunction with the feed dog, wherein the binding device folds to the left around a needle for binding and deflects the material when the feed dog moves horizontally backward; when the feeding teeth horizontally reset forwards, the covering device deflects around a needle for covering and resets. Through the linkage of the feeding teeth and the edge covering device in the horizontal direction, the edge covering device can synchronously swing on the premise of finishing folding and sewing and edge covering and sewing at one time, so that the side edges of the edge covering joint material can be further ensured to be sewn, and the quality of edge covering and sewing can be ensured.

Preferably, the edge covering device comprises a device body and an external connecting piece, wherein the edge covering strip is gradually folded in half and can be coated on the side surface and the bottom surface of the folded sewing material, the external connecting piece is used for positioning the device body, a C-shaped cavity is formed in the end surface of the device body, a C-shaped opening is formed in the inner wall of the C-shaped cavity, an avoiding gap capable of avoiding the deflection of the left end part of the device body is formed in the feeding platform, the device body is inserted into the upper surface and the lower surface of the presser foot from the left end part of the C-shaped opening, and the presser foot can be arranged between the C-shaped; the external connecting piece is pivoted on the feeding tooth from one end part and is connected on a base of the sewing machine in a free rotating mode from the other end part. The advantage of setting up like this is that, the edging of being convenient for can be more perfect cladding and laminate in the side of seaming material after closing up.

Preferably, the external connector comprises a first connecting plate and a second connecting plate which rotate from one end part and are connected in a sliding mode, the first connecting plate is connected to a machine base of the sewing machine in a rotating mode from the other end part, the other end part of the second connecting plate is connected with the feeding tooth in a rotating mode, and the device body is fixed on the second connecting plate.

Furthermore, one of the external connecting piece and the feeding tooth is provided with a spherical joint, and the other one is provided with a pivoting groove matched with the spherical joint.

In addition, the feeding motion of the feeding teeth is a compound motion, namely, a horizontal motion and a vertical motion are compounded. The feeding tooth is in closed curve motion, namely, in the process of forming each needle pitch, the feeding tooth is required to be alternately and circularly ascended, descended, moved forwards and moved backwards. When the needle retreats and stitches the material, the feed dog also ascends at the same time, the needle plate is exposed, and the sewing material is pushed for a distance under the cooperation of the presser foot, and the distance is called the needle pitch. After the material selecting teeth finish the feeding movement, the needle plate is descended to the position below the needle plate, separated from the sewing material and retreated to the original position to prepare the next feeding action.

Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:

on the premise that the covering device automatically covers the side edge of the sewing material, the synchronous shuttling of the two staggered needles ensures that the front folding part and the rear covering part are not interfered with each other, and the folding and the covering sewing are completed at one time, so that the sewing efficiency is high, the sewing cost is greatly reduced, and in addition, the structure is simple, the implementation is convenient, and the cost is low.

Drawings

The invention is described in further detail below with reference to the figures and specific examples.

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

FIG. 2 is a schematic view of the structure of FIG. 1 at another angle;

FIG. 3 is an exploded view of the sewing machine of the present embodiment;

wherein: 1. a feeding unit; 10. a feeding platform; 11. feeding teeth; 12. a feed drive;

2. a stitching unit; 20. a presser foot; 20a, a large presser foot; 20b, a small presser foot; a. a first pinhole; b. a second pinhole; 21. a needle; 22. a machine shuttle; 23. needle clips;

3. a binding device; 30. a device body; 31. an external connector; 31a, a first connecting plate; 31b, a second connecting plate;

J. a machine base.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

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 application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature. It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As shown in fig. 1 and 2, the sewing machine for one-step forming of folded hems of the present embodiment includes a feeding unit 1, a sewing unit 2, and a hemer 3.

The feeding unit 1 comprises a feeding platform 10, a feeding tooth 11 and a feeding driver 12, wherein the sewing material is pushed back and forth in the movement of the feeding tooth 11.

In the art, the feed motion of the feed dog is a compound motion, i.e. a combination of horizontal and vertical motion. The feeding tooth is in closed curve motion, namely, in the process of forming each needle pitch, the feeding tooth is required to be alternately and circularly ascended, descended, moved forwards and moved backwards. When the needle retreats and stitches the material, the feed dog also ascends at the same time, the needle plate is exposed, and the sewing material is pushed for a distance under the cooperation of the presser foot, and the distance is called the needle pitch. After the material selecting teeth finish the feeding movement, the needle plate is descended to the position below the needle plate, separated from the sewing material and retreated to the original position to prepare the next feeding action.

It will be clear that the feeder actuator 12 is also conventional in the art and will not be described in detail here.

The sewing unit 2 includes a presser foot 20, a needle 21, a shuttle 22, and a needle driver.

The hemmer 3 wraps the edge wrapping strip on the side edge of the sewing material and automatically feeds the edge wrapping strip between the presser foot 20 and the feeding tooth 11.

The presser foot 20 is provided with two first needle holes a and second needle holes b which are staggered, the first needle holes a and the second needle holes b are distributed in tandem and left-right, the machine needles 21 and the shuttle are in one-to-one correspondence and divided into two groups, one group is used for folding the sewing material, the other group is used for wrapping the sewing material, in the process of sewing the sewing material from front to back, the machine needles 21 for folding penetrate through the first needle holes a to sew the side edges of the sewing material, the machine needles 21 for wrapping penetrate through the second needle holes b to sew the folded sewing material and the wrapping strip, and the machine needles for folding and wrapping can synchronously finish folding and wrapping sewing of the side edges of the sewing material at one time along with the forward sewing of the sewing material.

In this example, the needles 21 used for folding and hemming are respectively fixed on the needle clamp 23 by fastening screws, and the needle driver is used for driving the needle clamp 23 to move up and down to drive the two needles 21 to move back and forth synchronously. On one hand, the folding and the edge covering synchronous sewing are convenient to implement; on the other hand, the needle is convenient to replace, and the single function of folding or edge covering is convenient to implement.

Although not shown, the needle driver is of a very conventional design in the sewing machine field and will not be described in detail here, and is clearly and practically implementable.

The presser foot 20 comprises a large presser foot 20a and a small presser foot 20b, wherein the large presser foot 20a is located behind the small presser foot 20b and can be pressed on the feeding platform 10, and the first needle hole a and the second needle hole b are distributed on the small presser foot 20b and can be pressed on the feeding tooth 11. Through the arrangement of the large presser foot and the small presser foot, the sewing material can be conveniently horizontally pushed, and the folding and edge-covering sewing are more facilitated.

The discharge end of the binding device 3 is correspondingly distributed between the folding needle 21 and the binding needle 21 and is positioned on the right side of the binding needle 21.

In this example, the edge covering device 3 is transversely extended from left to right, the discharging end part is positioned at the left end of the edge covering device 3, and the discharging end surface is obliquely arranged from left to right, so that the edge covering belt is convenient to turn, and the edge covering device is favorable for covering the side edges.

Meanwhile, the covering device 3 is linked with the feeding teeth 11, wherein when the feeding teeth 11 horizontally move backwards, the covering device 3 folds towards the left side around a needle 21 for covering and then the sewing material deflects; when the feed dog 11 is reset horizontally forward, the covering device 3 is deflected around the needle 21 for covering to reset. Through the linkage of the feeding teeth and the edge covering device in the horizontal direction, the edge covering device can synchronously swing on the premise of finishing folding and sewing and edge covering and sewing at one time, so that the side edges of the edge covering joint material can be further ensured to be sewn, and the quality of edge covering and sewing can be ensured.

Specifically, when the feeding tooth 11 finishes one horizontal backward movement, the edge covering device 3 deflects leftwards, the specific deflection is proportional to the sewing needle pitch, and the larger the needle pitch is, the larger the deflection angle is; the smaller the gauge, the smaller the deflection angle.

The binding device 3 comprises a device body 30 which gradually folds the binding strip and can coat the side surface and the bottom surface of the folded sewing material, and an external connecting piece 31 used for positioning the device body 30, wherein the external connecting piece 31 is pivoted on the feeding tooth 11 from one end part and is freely and rotatably connected on a machine base J of the sewing machine from the other end part.

Specifically, a C-shaped cavity is formed in the end face of the device body 30, a C-shaped opening is formed in the inner wall of the C-shaped cavity, the upper surface and the lower surface of the small presser foot 20b are inserted into the device body 30 from the left end portion of the C-shaped opening, and an avoidance notch is formed in the feeding platform 10, so that the avoidance notch avoids the deflection of the left end portion of the device body 30.

At the same time, the small presser foot 20b can be set up in a lifting adjustment between the C-shaped openings.

The external member 31 includes a first connecting plate 31a and a second connecting plate 31b which are rotatably and slidably connected from one end portion, wherein the first connecting plate 31a is rotatably connected to a bed J of the sewing machine from the other end portion, the other end portion of the second connecting plate 31b is rotatably connected to the feed dog 11, and the body 30 is fixed to the second connecting plate 31 b.

The second connecting plate 31b is formed with a ball joint, and the feeding tooth 11 is formed with a pivot groove matched with the ball joint. Thus, the feeding tooth 11 will drive the second connecting plate 31b to swing as long as it moves back and forth in the horizontal direction.

As for the first connecting plate 31a and the second connecting plate 31b which are rotated from the ends and slidably connected, the first connecting plate 31a and the second connecting plate 31b are connected using a generally elongated runner and a locking bolt which slides relative to the elongated runner. Thus, when the swinging force is applied, the relative rotation adjustment of the first connecting plate 31a and the second connecting plate 31b is facilitated.

The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.