Follow-up device for hemmer of sewing machine

Abstract

The hemmer follow-up device of the sewing machine comprises a bottom plate, a swing arm, a driving connecting rod, a hemming sleeve and a power source, the bottom plate is installed on a machine shell of the sewing machine, the hemming sleeve is located on the top face of the bottom plate, an elastic band with hemmed cloth is arranged in the hemming sleeve in a penetrating mode, one end of the swing arm is fixed to the hemming sleeve through a connecting block, and the other end of the swing arm is connected with the power source. The driving connecting rod is hinged to the bottom plate, meanwhile, the middle of the swing arm is hinged to the end of the driving connecting rod, the power source drives the driving connecting rod to rotate, the driving connecting rod drives the swing arm to swing with the rotating shaft as the original point, and the swing arm drives the hemming sleeve to move synchronously. According to the hemmer follow-up device of the sewing machine, the elastic band and the cloth in the hemming sleeve are gradually exposed out of the hemming sleeve along with movement of the hemming sleeve and are stacked at the end of the hemming sleeve, so that the elastic band is in a loose state during sewing, it is guaranteed that the elastic band does not elastically retract after sewing, and the flatness and attractiveness of the cloth are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of knitting and relates to a follow-up device for a hemming device of a sewing machine. Background Art

[0002] In the knitting industry, sewing machines are very common equipment. In the processing of some products, such as hemming the waistbands and cuffs of trousers or hemming the edges of bedding in the home furnishing industry, it is necessary to sew an elastic band to the edge of the fabric so that the edge of the fabric has a certain elasticity. The current method is to first measure the hemming size with a ruler, draw a width mark of the required hem with chalk, then iron out the crease and finally stitch with a machine. Especially when the widths of the required hem and the elastic band are uneven, it is easy to fail to master the pulling force of the elastic band during the stitching process, resulting in inconsistent tension around the circumference and difficult to guarantee the quality. In response to this situation, a synchronous overlock device for elastic bands has emerged on the market. For example, a synchronous overlock device for elastic bands applied to a sewing machine described in Chinese Patent No. "201910305531.4". The specific structure of this synchronous overlock device for elastic bands is as follows: It includes a machine table, a sewing machine body fixed on the upper side of the machine table, and a vertically arranged sewing needle installed on the sewing machine body. A wrapping mechanism located on the feeding side of the sewing needle, a pulling mechanism located on the discharging side of the sewing needle, a tensioning mechanism located at the front end of the wrapping mechanism, and a transition frame located above the tensioning mechanism are also installed on the upper side of the machine table. The elastic band passes through the transition frame, the tensioning mechanism, the wrapping mechanism, and the pulling mechanism in sequence. The elastic band contacts the fabric in the wrapping mechanism, and the fabric wraps the elastic band, and after the wrapping is completed, the sewing needle locks the edge of the fabric. In the above structure, the tensioning mechanism and the pulling mechanism keep the elastic band in a constant tension state, that is, when the sewing needle locks the edge of the fabric, the elastic band is still in a tensioned and stretched state, and after the sewing is completed, the elastic recovery of the elastic band will cause the fabric to wrinkle and curl, greatly affecting the aesthetics of the finished product. Summary of the Invention

[0003] The purpose of the utility model is to provide a follow-up device for a hemming device of a sewing machine that enables the elastic band to be in a relaxed state during sewing in view of the above problems existing in the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a hemming follower device of a sewing machine, comprising a base plate, a swing arm, a driving connecting rod, a hemming sleeve and a power source, wherein the base plate is installed on the sewing machine casing, the hemming sleeve is located on the top surface of the base plate, and an elastic band with curled fabric is inserted into the hemming sleeve, one end of the swing arm is fixed to the hemming sleeve through a connecting block, and the other end of the swing arm is hinged to the base plate through a rotating shaft, and the driving connecting rod is hinged to the base plate, and at the same time, the middle part of the swing arm is hinged to the end of the driving connecting rod, the power source drives the driving connecting rod to rotate, and the driving connecting rod drives the swing arm to swing with the rotating shaft as the origin, and the swing arm drives the hemming sleeve to move synchronously.

[0005] In the above-mentioned hemming device follower of the sewing machine, the power source includes a driving motor, a cloth feed shaft, a first crank, a transmission connecting rod, a second crank, and a transmission shaft. The cloth feed shaft is hinged to the bottom surface of the base plate, the driving motor is connected to the cloth feed shaft and drives the cloth feed shaft to rotate, the first crank is sleeved and fixed on the cloth feed shaft, the transmission connecting rod is hinged to the first crank, the second crank is hinged to the end of the transmission connecting rod, the transmission shaft is passed through the base plate and can rotate relative to the transmission shaft, the end of the second crank is fixed to the bottom of the transmission shaft, the driving connecting rod is fixed to the top of the transmission shaft, the driving motor drives the cloth feed shaft to rotate, and the cloth feed shaft drives the transmission shaft to rotate relative to the base plate through the first crank, the transmission connecting rod, and the second crank, thereby rotating the driving connecting rod.

[0006] In the above-mentioned hemming follower device of the sewing machine, the bottom of the rotating shaft is fixed on the base plate, the end of the swing arm is made with a connecting ring, and the first positioning ring, the connecting ring and the second positioning ring are sequentially sleeved on the rotating shaft, and the connecting ring can rotate relative to the rotating shaft.

[0007] Compared with the prior art, the driving motor in the hemming follower device of the sewing machine drives the cloth feed shaft to rotate, and the cloth feed shaft drives the transmission shaft to rotate relative to the base plate through the first crank, the transmission connecting rod, and the second crank, thereby rotating the driving connecting rod, and the driving connecting rod drives the swing arm to swing with the rotation axis as the origin, and the swing arm drives the hemming sleeve to move synchronously. When the hemming sleeve moves, it first moves away from the presser foot and then resets. The elastic band and fabric inside the hemming sleeve gradually emerge from the hemming sleeve as the hemming sleeve moves and accumulate at the end of the hemming sleeve, so that the elastic band is in a relaxed state during sewing, ensuring that the elastic band will not elastically shrink after sewing, and ensuring the flatness and aesthetics of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a three-dimensional structural diagram of the crimper follower device of the sewing machine.

[0009] Figure 2 It is a schematic diagram of the three-dimensional structure of the crimping device follower of the sewing machine from another angle.

[0010] In the figure, 1, base plate; 2, cloth feed shaft; 3, swing arm; 31, connecting ring; 4, driving connecting rod; 5, crimping sleeve; 6, first crank; 7, transmission connecting rod; 8, second crank; 9, transmission shaft; 10, rotating shaft; 11, first positioning ring; 12, second positioning ring; 13, connecting block. DETAILED DESCRIPTION

[0011] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0012] like Figure 1 and Figure 2 As shown, the hemming follower device of this sewing machine comprises a base plate 1, a swing arm 3, a drive link 4, a hemming sleeve 5, and a power source. The base plate 1 is mounted on the sewing machine housing, and the hemming sleeve 5 is located on the top surface of the base plate 1. The hemming sleeve 5 contains an elastic band with hemmed fabric. One end of the swing arm 3 is fixed to the hemming sleeve 5 via a connecting block 13, and the other end of the swing arm 3 is hinged to the base plate 1 via a rotating shaft 10. The drive link 4 is hinged to the base plate 1, and the middle portion of the swing arm 3 is hinged to the end of the drive link 4. The power source drives the drive link 4 to rotate, which in turn drives the swing arm 3 to swing about the rotating shaft 10, and the swing arm 3 drives the hemming sleeve 5 to move synchronously. Before sewing, the ends of the elastic band and the fabric are exposed from the hemming sleeve 5 and are pressed and positioned by the presser foot. When the hemming sleeve 5 moves, it first moves away from the presser foot and then returns to its original position. The elastic band and fabric inside the hemming sleeve 5 gradually emerge from the hemming sleeve 5 as the hemming sleeve 5 moves and accumulate at the end of the hemming sleeve 5, so that the elastic band is in a relaxed state during sewing, ensuring that the elastic band will not elastically shrink after sewing, and ensuring the flatness and aesthetics of the fabric.

[0013] In the above technical solution: the power source includes a drive motor, a cloth feed shaft 2, a first crank 6, a transmission connecting rod 7, a second crank 8, and a transmission shaft 9. The cloth feed shaft 2 is hinged to the bottom surface of the base plate 1. The drive motor is connected to the cloth feed shaft 2 and drives the cloth feed shaft 2 to rotate. The first crank 6 is sleeved and fixed on the cloth feed shaft 2, and the transmission connecting rod 7 is hinged to the first crank 6. The second crank 8 is hinged to the end of the transmission connecting rod 7. The transmission shaft 9 is passed through the base plate 1 and can rotate relative to the transmission shaft 9. The end of the second crank 8 is fixed to the bottom of the transmission shaft 9, and the drive connecting rod 4 is fixed to the top of the transmission shaft 9. The drive motor drives the cloth feed shaft 2 to rotate, and the cloth feed shaft 2 drives the transmission shaft 9 to rotate relative to the base plate 1 through the first crank 6, the transmission connecting rod 7, and the second crank 8, thereby rotating the drive connecting rod 4.

[0014] In the above technical solution: The bottom of the rotating shaft 10 is fixed on the bottom plate 1. A connecting ring 31 is formed at the end of the swing arm 3. A first positioning ring 11, the connecting ring 31 and a second positioning ring 12 are successively sleeved on the rotating shaft 10. The connecting ring 31 can rotate relative to the rotating shaft 10. The first positioning ring 11 and the second positioning ring 12 play a role in positioning the rotation process of the connecting ring 31 to prevent the swing arm 3 from swaying when it swings.

[0015] In the hemming device follower of this sewing machine, the drive motor drives the feed shaft 2 to rotate. The feed shaft 2 drives the transmission shaft 9 to rotate relative to the bottom plate 1 through the first crank 6, the transmission connecting rod 7 and the second crank 8, so that the drive connecting rod 4 rotates. The drive connecting rod 4 drives the swing arm 3 to swing with the rotating shaft 10 as the origin. The swing arm 3 drives the hemming sleeve 5 to move synchronously. When the hemming sleeve 5 moves, it first moves away from the presser foot and then resets. The elastic band and the fabric inside the hemming sleeve 5 gradually expose from the hemming sleeve 5 and accumulate at the end of the hemming sleeve 5 as the hemming sleeve 5 moves. Thus, the elastic band is in a relaxed state during sewing, ensuring that the elastic band will not have elastic retraction after sewing and ensuring the flatness and beauty of the fabric.

[0016] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0017] Although terms such as the bottom plate 1; the feed shaft 2; the swing arm 3; the connecting ring 31; the drive connecting rod 4; the hemming sleeve 5; the first crank 6; the transmission connecting rod 7; the second crank 8; the transmission shaft 9; the rotating shaft 10; the first positioning ring 11; the second positioning ring 12; the connecting block 13 are used more in this article, the possibility of using other terms is not excluded. Using these terms is only for more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0018] The content not described in detail in this specification belongs to the prior art well known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. The hemming attachment follower device of a sewing machine, characterized in that It includes a bottom plate (1), a swing arm (3), a driving link (4), a hemming sleeve (5) and a power source. The bottom plate (1) is installed on the sewing machine housing. The hemming sleeve (5) is located on the top surface of the bottom plate (1). An elastic band with the hemmed fabric is threaded through the hemming sleeve (5). One end of the swing arm (3) is fixed to the hemming sleeve (5) through a connecting block (13). The other end of the swing arm (3) is hinged to the bottom plate (1) through a rotating shaft (10). The driving link (4) is hinged to the bottom plate (1). At the same time, the middle part of the swing arm (3) is hinged to the end of the driving link (4). The power source drives the driving link (4) to rotate. The driving link (4) drives the swing arm (3) to swing with the rotating shaft (10) as the origin. The swing arm (3) drives the hemming sleeve (5) to move synchronously.

2. The hemming attachment follower device of the sewing machine according to claim 1, characterized in that The power source includes a driving motor, a feed shaft (2), a first crank (6), a transmission link (7), a second crank (8), and a transmission shaft (9). The feed shaft (2) is hinged to the bottom surface of the bottom plate (1). The driving motor is connected to the feed shaft (2) and drives the feed shaft (2) to rotate. The first crank (6) is sleeved and fixed on the feed shaft (2). The transmission link (7) is hinged to the first crank (6). The second crank (8) is hinged to the end of the transmission link (7). The transmission shaft (9) passes through the bottom plate (1) and can rotate relative to the transmission shaft (9). The end of the second crank (8) is fixed to the bottom of the transmission shaft (9). The driving link (4) is fixed to the top of the transmission shaft (9). The driving motor drives the feed shaft (2) to rotate. The feed shaft (2) drives the transmission shaft (9) to rotate relative to the bottom plate (1) through the first crank (6), the transmission link (7), and the second crank (8), so that the driving link (4) rotates.

3. The hemming device follower of the sewing machine according to claim 1, characterized in that The bottom of the rotating shaft (10) is fixed to the bottom plate (1). A connecting ring (31) is formed at the end of the swing arm (3). A first positioning ring (11), the connecting ring (31), and a second positioning ring (12) are sequentially sleeved on the rotating shaft (10). The connecting ring (31) can rotate relative to the rotating shaft (10).

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