A sewing machine with a follow-up hemmer

Abstract

The utility model provides a kind of sewing machine with follow-up hemming, including bottom plate, swing arm, drive connecting rod, first transmission connecting rod, hemming sleeve and power source, bottom plate is installed on sewing machine shell, hemming sleeve is located at the top surface of bottom plate, the tightness band with hemmed cloth is arranged in hemming sleeve, one end of swing arm is fixed with hemming sleeve by connecting block, the other end of swing arm is hinged on bottom plate by rotating shaft, drive connecting rod is hinged on bottom plate, the both ends of first transmission connecting rod are respectively hinged with drive connecting rod and swing arm, power source drives drive connecting rod to rotate, drive connecting rod drives swing arm to swing with rotating shaft as origin by first transmission connecting rod, swing arm drives hemming sleeve to move synchronously.The tightness band and cloth in the hemming sleeve of the sewing machine with follow-up hemming gradually expose hemming sleeve and accumulate in hemming sleeve end portion along with the movement of hemming sleeve, so that tightness band is in slack state when sewing, and tightness band does not appear elastic retraction condition after sewing;First transmission connecting rod is convenient for adjusting swing amplitude of swing arm.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine with a follow-up hemming function. Background Technology

[0002] In the knitting industry, sewing machines are very common equipment. In the processing of certain products, such as waistbands, cuff hems, or binding around the edges of bedding in the home furnishing industry, elastic bands need to be sewn to the edges of the fabric to give the fabric a certain degree of elasticity. The current practice is to first measure the hem size with a ruler, mark the required hem width with chalk, then iron out the creases, and finally tie the thread with a machine. Especially when the required hem width and elastic band width are different, it is easy to lose control of the force when pulling the elastic band by hand during the tying process, resulting in inconsistent tension around the perimeter and making it difficult to guarantee quality. To address this issue, a synchronous overlock sewing device for elastic bands has emerged on the market, such as the synchronous overlock sewing device for elastic bands applied to sewing machines described in Chinese Patent No.: "201910305531.4". The specific structure of this synchronous overlock sewing device for elastic bands includes a machine base, a sewing machine body fixed on the upper side of the machine base, and vertically arranged needles installed on the sewing machine body. The upper part of the machine platform is also equipped with a wrapping mechanism on the needle feeding side, a pulling mechanism on the needle exit side, a tensioning mechanism at the front of the wrapping mechanism, and a transition frame above the tensioning mechanism. The elastic band passes through the transition frame, tensioning mechanism, wrapping mechanism, and pulling mechanism in sequence. Inside the wrapping mechanism, the elastic band contacts the fabric and wraps around it. After wrapping, the needle is used to overlock the fabric. In the above structure, the tensioning and pulling mechanisms keep the elastic band in a constant tension state. That is, when the needle is overlocking the fabric, the elastic band is still in a tensile state. After sewing, the elastic band will shrink back due to elasticity, causing the fabric to wrinkle and curl, which greatly affects the appearance of the finished product. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in the prior art by providing a sewing machine with a follow-up hemming mechanism.

[0004] The objective of this utility model can be achieved through the following technical solution: A sewing machine with a follow-up hemming mechanism includes a base plate, a swing arm, a drive linkage, a first transmission linkage, a hemming sleeve, and a power source. The base plate is mounted on the sewing machine housing, and the hemming sleeve is located on the top surface of the base plate. An elastic band with hemmed fabric is threaded through the hemming sleeve. One end of the swing arm is fixed to the hemming sleeve via a connecting block, and the other end of the swing arm is hinged to the base plate via a rotating shaft. The drive linkage is hinged to the base plate. Both ends of the first transmission linkage are respectively hinged to the drive linkage and the swing arm. The power source drives the drive linkage to rotate, and the drive linkage drives the swing arm to swing around the rotating shaft as the origin via the first transmission linkage. The swing arm drives the hemming sleeve to move synchronously.

[0005] In the aforementioned sewing machine with follow-up hemming, the first transmission link includes a connecting part and fixed parts located at both ends of the connecting part. The first transmission link is approximately "U-shaped". Bearings are provided in both fixed parts, and hinge shafts are passed through both bearings. The bottoms of the two hinge shafts are respectively threaded onto the drive link and the swing arm. A U-shaped groove is also formed on the top of the hinge shaft.

[0006] In the aforementioned sewing machine with follow-up hemming, the connecting block is arc-shaped, and the end of the connecting block is provided with an elongated fixing hole. The end of the swing arm is provided with several threaded holes, and the screw passes through the fixing hole and is fixed in the threaded hole.

[0007] In the aforementioned sewing machine with follow-up hemming, the power source includes a drive motor, a feed shaft, a first crank, a second transmission connecting rod, a second crank, and a transmission shaft. The feed shaft is hinged to the bottom surface of the base plate. The drive motor is connected to the feed shaft and drives it to rotate. The first crank is sleeved and fixed on the feed shaft. The second transmission connecting rod is hinged to the first crank. The second crank is hinged to the end of the second transmission connecting rod. The transmission shaft passes through the base plate and can rotate relative to it. The end of the second crank is fixed to the bottom of the transmission shaft. The drive connecting rod is fixed to the top of the transmission shaft. The drive motor drives the feed shaft to rotate. The feed shaft, through the first crank, the second transmission connecting rod, and the second crank, drives the transmission shaft to rotate relative to the base plate, causing the drive connecting rod to rotate.

[0008] Compared with existing technologies, in this sewing machine with follow-up hemming, the drive motor drives the feed shaft to rotate. The feed shaft, through the first crank, the second transmission linkage, and the second crank, drives the transmission shaft to rotate relative to the base plate, thereby causing the drive linkage to rotate. The drive linkage drives the swing arm to swing around the rotation axis as the origin. 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 returns to its original position. As the hemming sleeve moves, the elastic band and fabric inside the hemming sleeve are gradually exposed and piled up 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 shrink back after sewing, thus ensuring the flatness and aesthetics of the fabric. The first transmission linkage makes the swing arm swing more stable and flexible. Compared with directly hinged to the drive linkage, it prevents the swing arm from jamming during rotation and does not make the processing of the swing arm more complicated. Meanwhile, the swing arm is connected to the drive link via the first transmission link. The swing amplitude of the swing arm depends on the length of the first transmission link. When it is necessary to adjust the swing amplitude of the swing arm, the first transmission link of the corresponding length can be replaced. It is flexible and adaptable to different sewing needs. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the hemming follower device of this sewing machine.

[0010] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0011] Figure 3 This is a three-dimensional structural diagram of the hemming follower device of this sewing machine from another angle.

[0012] In the diagram, 1 is the base plate; 2 is the fabric feeding shaft; 3 is the swing arm; 4 is the drive linkage; 5 is the hemming sleeve; 6 is the first crank; 7 is the second transmission linkage; 8 is the second crank; 9 is the transmission shaft; 10 is the rotating shaft; 11 is the bearing; 12 is the hinge shaft; 13 is the connecting block; 131 is the fixing hole; 14 is the first transmission linkage; and 15 is the groove. Detailed Implementation

[0013] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0014] like Figure 1-3As shown, this sewing machine with a follow-up hemming mechanism includes a base plate 1, a swing arm 3, a drive linkage 4, a first transmission linkage 14, 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. An elastic band with hemmed fabric is threaded inside the hemming sleeve 5. 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 linkage 4 is hinged to the base plate 1, and both ends of the first transmission linkage 14 are hinged to the drive linkage 4 and the swing arm 3, respectively. The power source drives the drive linkage 4 to rotate, and the drive linkage 4 drives the swing arm 3 to swing around the rotating shaft 10 as the origin via the first transmission linkage 14. The swing arm 3 drives the hemming sleeve 5 to move synchronously. Before sewing, the ends of the elastic band and fabric protrude from the hem sleeve 5 and are held in place by the presser foot. When the hem sleeve 5 moves, it first moves away from the presser foot and then returns to its original position. As the hem sleeve 5 moves, the elastic band and fabric inside the hem sleeve 5 gradually protrude from the hem sleeve 5 and accumulate at the end of the hem sleeve 5, so that the elastic band is in a relaxed state during sewing, ensuring that the elastic band will not shrink back after sewing, and ensuring the flatness and appearance of the fabric.

[0015] The first transmission link 14 makes the swing arm 3 more stable and flexible. Compared with directly hinged to the drive link 4, it prevents the swing arm 3 from jamming during rotation and does not complicate the manufacturing process of the swing arm 3. The first transmission link 14 connects the swing arm 3 and the drive link 4. The swing amplitude of the swing arm 3 depends on the length of the first transmission link 14. When it is necessary to adjust the swing amplitude of the swing arm 3, simply replace the first transmission link 14 with one of the corresponding length. This flexibility adapts to different sewing needs. For example, replacing the first transmission link 14 with a longer one results in a larger swing amplitude of the swing arm 3, a greater distance the hem sleeve 5 moves, and more elastic band accumulates. Replacing the first transmission link 14 with a shorter one results in a smaller swing amplitude of the swing arm 3, a smaller distance the hem sleeve 5 moves, and less elastic band accumulates.

[0016] In the above technical solution: the first transmission link 14 includes a connecting part and fixed parts located at both ends of the connecting part. The first transmission link 14 is approximately "figure-eight shaped". Each of the two fixed parts is provided with a bearing 11, and each of the two bearings 11 has a hinge shaft 12 passing through it. The bottom of the two hinge shafts 12 is threadedly fixed to the drive link 4 and the swing arm 3, respectively. The top of the hinge shaft 12 is also provided with a slotted groove 15, which facilitates the installation and removal of the hinge shaft 12 using items such as a flathead screwdriver, coin, or card, and facilitates the replacement of the first transmission link 14.

[0017] In the above technical solution: the connecting block 13 is arc-shaped, and an elongated fixing hole 131 is formed at the end of the connecting block 13. Several threaded holes are formed at the end of the swing arm 3, and screws pass through the fixing holes and are fixed in the threaded holes. The elongated fixing hole 131 facilitates the adjustment of the installation position of the connecting block 13 relative to the swing arm 3.

[0018] In the above technical solution: the power source includes a drive motor, a feed shaft 2, a first crank 6, a second transmission connecting rod 7, a second crank 8, and a transmission shaft 9. The feed shaft 2 is hinged to the bottom surface of the base plate 1. The drive 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, and the second transmission connecting rod 7 is hinged to the first crank 6. The second crank 8 is hinged to the end of the second transmission connecting rod 7. The transmission shaft 9 passes 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 feed shaft 2 to rotate, and the feed shaft 2 drives the transmission shaft 9 to rotate relative to the base plate 1 through the first crank 6, the second transmission connecting rod 7, and the second crank 8, thereby causing the drive connecting rod 4 to rotate.

[0019] In the hemming device 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 base plate 1 through the first crank 6, the second transmission connecting rod 7, and the second crank 8, thereby causing the drive connecting rod 4 to rotate. The drive connecting rod 4 drives the swing arm 3 to swing around the rotation 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 returns to its original position. As the hemming sleeve 5 moves, the elastic band and fabric inside the hemming sleeve 5 are gradually exposed and piled up 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 shrink back after sewing, and ensuring the flatness and appearance of the fabric. The first transmission connecting rod 14 makes the swing arm 3 more stable and flexible. Compared with directly hinged to the drive connecting rod 4, it prevents the swing arm 3 from jamming when rotating, and does not make the processing of the swing arm 3 more complicated. Meanwhile, the swing arm 3 is connected to the drive link 4 via the first transmission link 14. The swing amplitude of the swing arm 3 depends on the length of the first transmission link 14. When it is necessary to adjust the swing amplitude of the swing arm 3, the first transmission link 14 of the corresponding length can be replaced. It is flexible and adaptable to different sewing needs.

[0020] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0021] Although this document frequently uses terms such as base plate 1, feed shaft 2, swing arm 3, drive linkage 4, hemming sleeve 5, first crank 6, second transmission linkage 7, second crank 8, transmission shaft 9, rotating shaft 10, bearing 11, hinge shaft 12, connecting block 13, fixing hole 131, first transmission linkage 14, and groove 15, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

[0022] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A sewing machine with a follow-up hemming mechanism, characterized in that... The sewing machine includes a base plate (1), a swing arm (3), a drive link (4), a first transmission link (14), a hemming sleeve (5), and a power source. The base plate (1) is mounted on the sewing machine housing. The hemming sleeve (5) is located on the top surface of the base plate (1). An elastic band with rolled fabric is threaded inside the hemming sleeve (5). 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 (5) via a rotating shaft (10). On the base plate (1), the drive link (4) is hinged to the base plate (1). The two ends of the first transmission link (14) are respectively hinged to the drive link (4) and the swing arm (3). The power source drives the drive link (4) to rotate. The drive link (4) drives the swing arm (3) to swing around the rotation axis (10) as the origin through the first transmission link (14). The swing arm (3) drives the rolled edge sleeve (5) to move synchronously.

2. The sewing machine with follow-up hemming according to claim 1, characterized in that... The first transmission link (14) includes a connecting part and a fixing part located at both ends of the connecting part. The first transmission link (14) is approximately "figure-eight shaped". Each of the two fixing parts is provided with a bearing (11). Each of the two bearings (11) is provided with a hinge shaft (12). The bottom of the two hinge shafts (12) is threaded onto the drive link (4) and the swing arm (3) respectively. The top of the hinge shaft (12) is also provided with a groove (15) in the shape of a line.

3. A sewing machine with a follow-up hemming mechanism according to claim 1, characterized in that... The connecting block (13) is arc-shaped, and the end of the connecting block (13) is provided with a long strip-shaped fixing hole (131). The end of the swing arm (3) is provided with several threaded holes, and the screw passes through the fixing hole and is fixed in the threaded hole.

4. A sewing machine with a follow-up hemming mechanism according to claim 1, characterized in that... The power source includes a drive motor, a feed shaft (2), a first crank (6), a second transmission connecting rod (7), a second crank (8), and a transmission shaft (9). The feed shaft (2) is hinged to the bottom surface of the base plate (1). The drive 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 second transmission connecting rod (7) is hinged to the first crank (6). The second crank (8) is hinged to the end of the second transmission connecting rod (7). The drive shaft (9) passes through the base plate (1) and can rotate relative to the drive shaft (9). The end of the second crank (8) is fixed to the bottom of the drive shaft (9). The drive connecting rod (4) is fixed to the top of the drive shaft (9). The drive motor drives the feed shaft (2) to rotate. The feed shaft (2) drives the drive shaft (9) to rotate relative to the base plate (1) through the first crank (6), the second drive connecting rod (7), and the second crank (8), causing the drive connecting rod (4) to rotate.

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