CN218666636U - Thread trimming device and automatic sewing device - Google Patents

Abstract

The utility model provides a trimming device, include: a fixed seat (73); a fixed shear blade (61) fixed on the fixed seat (73); a movable shear blade (62) which is fixed on the fixed seat (73) by a bolt (74); a bending plate (65), wherein the upper end of the bending plate (65) is combined to the tail end of the movable shear blade (62); a wide angle pulling plate (69), wherein the upper end of the wide angle pulling plate (69) is combined to the lower end of the bending plate (65); when the lower end of the large angle pulling plate (69) is pushed and pulled, the movable shear blade (62) is opened and closed relative to the fixed shear blade (61). The utility model also provides an automatic suturing device, include: the thread trimming device (6); a sewing device (1); the position of the thread trimming device (6) is close to the sewing point of the sewing device (1). The utility model discloses can cut the sewing coil automatically after sewing is accomplished, need not carry out secondary operation with the fabric, realize automated production.

Description

Thread cutting device and automatic suturing device

technical field

The utility model relates to a sewing head, in particular to a thread cutting device and an automatic sewing device.

Background technique

At the present stage, the sewing and loom equipment technology can only complete basic weaving tasks. For example, the cylindrical fabric can only be woven as a whole, and one end of the fabric cannot be automatically sewed. The woven fabric needs to be put into another sewing separately. Secondary processing and sewing are carried out on the equipment to complete all the processes of the fabric. During this period, multiple workers are required to cooperate with each other to complete all processes. With regard to the production process at the present stage, neither can the production efficiency be improved, nor can the production cost be reduced.

Utility model content

Aiming at the problems in the background technology, the utility model proposes a thread trimming device, including: a fixed seat; a fixed shear, which is fixed on the fixed seat; a movable shear, which is fixed on the fixed seat by a bolt; a curved pull plate , the upper end of the curved pull plate is combined with the end of the movable shear piece; the large angle pull plate, the upper end of the large angle pull plate is combined with the lower end of the curved pull plate; when the lower end of the large angle pull plate is pushed and pulled, the movable The clips are opened and closed relative to the fixed clips.

Preferably, the thread trimming device further includes: a hook piece, which is installed together with the moving shear piece, and moves together; a curved push piece, which is fixed on the fixed seat by a bolt; The first end of the piece is combined with the end of the curved push piece to push and pull the curved push piece, and the second end of the plectrum can move between the eccentric tight ring on the curved pull plate and the upper end of the large angle pull plate.

Preferably, the heads of the curved hook piece and the curved push piece are hook-shaped, and the hooks are opposite to each other.

Preferably, when the lower end of the large-angle pull plate is pushed, the moving shear piece is close to the fixed shear piece, and the pick piece makes the curved push piece close to the middle. Before the thread is trimmed, the curved push piece first contacts and pushes out the thread to be cut for a certain length , then the hook piece contacts and tightens the line to be cut, the moving piece and the fixed piece cut the line; The hook pieces move relative to each other.

Preferably, the thread cutting device further includes: an air cylinder connected to the lower end of the large-angle pull plate; a tension spring connected to the cylinder and the large-angle pull plate.

The thread cutting device of the utility model has an ingenious structure and a compact structure, and can be highly matched with a sewing machine for thread cutting.

The utility model also proposes an automatic sewing device, including: the thread trimmer as described above; a sewing device, which has a first sewing needle, a second sewing needle and a steel needle that cooperate with each other for knotting; The position of the thread cutting device is close to the sewing point of the sewing device, and the sewing coil is trimmed after the sewing of the sewing device is completed.

Preferably, the sewing device further includes: a first connecting rod, the first end of which is connected to the second end of the long crank, the first end of the long crank is equipped with a first needle frame, and the first needle frame is mounted with the a first sewing needle; a second connecting rod, the first end of which is connected to the second end of the short crank, the first end of which is mounted with a second needle frame on which said second sewing needle is mounted .

Preferably, the automatic sewing device also includes a motor device, the motor device includes: a motor shaft; a large gear, which is connected to one end of the motor shaft, the large gear has an eccentric mounting hole, and the eccentric mounting hole is used to accommodate the first The second end of a connecting rod; the small needle eccentric wheel, which is connected to the other end of the motor shaft, the small needle eccentric wheel has an eccentric shaft end, and the eccentric shaft end is combined with the second end of the second connecting rod.

Preferably, the automatic sewing device further includes: a small gear handwheel meshing with the large gear.

Preferably, the distance between the thread trimming plane or the point position of the thread trimming of the thread trimming device and the tip of the steel sheath needle of the steel sheath needle is between 10.1-20mm, and the distance between the thread trimming plane or the point position of the thread trimming and the first seam The distance between the point where the movement of the knitting needle and the second knitting needle intersects is between 15.1-25 mm.

The automatic sewing device of the utility model transfers the fabric to the sewing device through the transfer device after the sewing machine equipment has finished weaving, and automatically sews one end of the fabric. The sewing loops are automatically cut off.

The beneficial effects of the utility model include: during the weaving process, the opening of the fabric can be automatically sewed, such as the toe of a sock, and a thread trimmer is provided, which can automatically cut the stitching loop after the weaving is completed, without the need for fabric Secondary processing greatly improves production efficiency, reduces costs, and realizes automated production.

Description of drawings

In order to understand the present invention more easily, the present invention will be described in more detail by referring to specific embodiments shown in the accompanying drawings. These drawings only depict typical implementations of the utility model, and should not be considered as limiting the protection scope of the utility model.

Fig. 1 is a perspective view of the automatic suturing device of the present invention.

Fig. 2 is a front view of the automatic suturing device of the present invention.

Fig. 3 is a perspective view from another angle of the automatic suturing device of the present invention.

Fig. 4 is a perspective view of an angle of the motor device of the automatic suturing device of the present invention.

Fig. 5 is a perspective view from another angle of the motor device of the automatic suturing device of the present invention.

Fig. 6 is a left side view of the automatic suturing device of the present invention described in Fig. 2 .

Fig. 7 is a right side view of the automatic suturing device of the present invention described in Fig. 2 .

Fig. 8 is a rear view of the automatic suturing device of the present invention described in Fig. 2 .

Fig. 9 is a schematic structural view of the steel needle of the automatic suturing device of the present invention.

FIG. 10 is a top view of the automatic suturing device of the present invention described in FIG. 2 .

Fig. 11-Fig. 14 have shown the motion process of the sewing needle and steel sheath needle of the present invention.

Fig. 15 is a schematic structural view of the thread cutting device in the opened state of the automatic suturing device of the present invention.

Fig. 16 is a schematic structural view of the thread cutting device in the closed state of the automatic suturing device of the present invention.

reference sign

Sewing device 1, steel leather needle 2, steel leather needle tip head 211, steel leather needle tip 212, steel leather needle body 213, steel leather needle mounting seat 22, first sewing needle 3, second sewing needle Needle 4, motor device 5, large gear 51, eccentric mounting hole 511, first connecting rod 52, long crank 53, pinion handwheel 54, small needle eccentric wheel 55, eccentric shaft end 551, second connecting rod 56, short Crank 57, thread trimming device 6, fixed cutting piece 61, moving cutting piece 62, hook piece 63, curved push piece 64, curved pull plate 65, eccentric tight ring 66, paddle 67, hanging seat 68, large angle pull plate 69 , tension spring 70, cylinder 71, support plate 72, fixed seat 73, latch 74, sewing coil 8, first needle frame 9, second needle frame 10, motor rotation direction 11, first connecting rod movement direction 12, the second A knitting needle moving direction 13 , a second connecting rod moving direction 14 , a second knitting needle moving direction 15 , and a sewing direction 16 .

Detailed ways

The following describes the implementation of the utility model with reference to the accompanying drawings, so that those skilled in the art can better understand the utility model and can implement it, but the examples listed are not as a limitation of the utility model, in the absence of conflict In some cases, the following embodiments and the technical features in the embodiments can be combined with each other, wherein the same components are denoted by the same reference numerals.

The device of the present application is described below by taking a fabric opening as an example, and the present application is not limited to sewing fabric openings.

As shown in FIGS. 1-2 , an automatic suturing device capable of automatic thread cutting according to the present invention includes: a sewing device 1 and a thread cutting device 6 .

The sewing device 1 includes: a first sewing needle 3 , a second sewing needle 4 and a steel sheath needle 2 . The first sewing needle 3 (big needle) and the second sewing needle 4 (small needle) are knotted together, and cooperate with the steel needle 2 to form a sewing loop 8 (see Figure 10), so as to sew The opening of the fabric. The first sewing needle 3 is installed on the first needle frame 9, the second sewing needle 4 is installed on the second needle frame 10, and the first needle frame 9 and the second needle frame 10 are driven by the motor device 5 to drive the first The sewing needle 3 and the second sewing needle 4 carry out a knotting motion: as shown in Figure 3, the first sewing needle 3 moves along the direction 13 (the first sewing needle movement direction), and the second sewing needle 4 moves along the direction 13. 15 (the moving direction of the second sewing needle), the moving planes where the moving directions of the first sewing needle 3 and the second sewing needle 4 are located are perpendicular to each other.

FIG. 4 shows a perspective view of the motor arrangement 5 from an angle. A large gear 51 is fixedly installed on the motor device 5, and a bump is installed on the big gear 51, and an eccentric mounting hole 511 is arranged on the bump.

FIG. 5 shows a perspective view of the motor arrangement 5 from an angle. A small needle eccentric wheel 55 is fixedly installed on the motor device 5 , and an eccentric shaft end 551 is fixed on the small needle eccentric wheel 55 . The large gear 51 and the small needle eccentric 55 can be installed on both sides of the motor device 5 .

The large gear 51 and the small needle eccentric wheel 55 can be mounted on a motor shaft. When the motor shaft rotates, the large gear 51 and the small needle eccentric wheel 55 can be driven to rotate simultaneously, thereby simultaneously actuating the first sewing needle 3 and the second sewing needle. knitting needles4. Adjustments to the stitching can thus be made by manually rotating the pinion handwheel 54 (see below).

As shown in FIG. 6 , the sewing and weaving device 1 includes a first connecting rod 52 and a long crank 53 installed on the box body. A first needle frame 9 is mounted on the first end of the long crank 53, and a first sewing needle 3 is mounted on the first needle frame 9. The second end of the long crank 53 is connected to the first end of the first connecting rod 52 , and the second end of the first connecting rod 52 is mounted on the eccentric mounting hole 511 on the large gear 51 of the motor device 5 . When the motor device 5 was in operation, the large gear 51 was driven to rotate clockwise in the arrow direction 11, and the first connecting rod 52 swung up and down in the direction indicated by the direction 12 (the first connecting rod moving direction, see Fig. 8). Thereby driving the second end of the long crank 53 to move back and forth according to the direction 16: when the eccentric mounting hole 511 moves to the lowest position, the second end of the long crank 53 is pulled down; when the eccentric mounting hole 511 moves to the highest position, when the The second end of the long crank 53 returns to its original position. In this way, the first needle holder 9 located on the first end of the first connecting rod 52 moves back and forth in the direction 13, so that the first sewing needle 3 moves according to a fixed movement path.

As shown in FIG. 7 , the sewing and weaving device 1 further includes a short crank 57 and a second connecting rod 56 , which are also installed on the box body. A second needle frame 10 is installed on the first end of the short crank 57, and a second sewing needle 4 is installed on the second needle frame 10. The second end of the short crank 57 is connected to the first end of the second connecting rod 56, and the second end of the second connecting rod 56 is connected to the eccentric shaft end 551 of the small needle eccentric wheel 55, and the small needle eccentric wheel 55 is installed on the motor On the device 5, it is driven by the motor device 5. When the motor device 5 rotates, it drives the small needle eccentric wheel 55 to rotate in the direction 11 (motor rotation direction, counterclockwise), and the second connecting rod 56 swings up and down, left and right in the direction indicated by the direction 14 (see Figure 8), driving the short The crank 57 moves, and the needle frame 9 moves back and forth in the direction 15, so that the second sewing needle 4 moves according to a fixed movement path.

Preferably, as shown in FIG. 6 and FIG. 8 , a small gear hand wheel 54 is installed on the box body, which meshes with the large gear 51 . At the initial stage of debugging, the hand wheel 54 is manually turned to drive the large gear 51 to rotate, so that the first sewing needle 3 and the second sewing needle 4 are moved, which is convenient for observing whether the sewing position is correct and observing the sewing effect. After debugging, configure the speed of the motor device 5 (controlled by the computer control system of the textile machine) to achieve a uniform and stable motion effect.

As shown in FIGS. 1-3 , the sewing and weaving device 1 further includes a steel sheath needle mounting base 22 and a steel sheath needle 2 , and the steel sheath needle 2 is installed on the steel sheath needle mounting base 22 . The structure of the steel-covered needle 2 is shown in Figure 9. The steel-covered needle 2 includes a steel-covered needle tip 212 and a steel-covered needle main body 213. Extending to the outside and gradually narrowing on both sides, the steel-skin needle tip 212 has a steel-skin needle tip head 211 at the front end. The steel leather needle 2 is outside the first sewing needle 3, and the steel leather needle 2 is parallel to the plane where the first sewing needle 3 is moving, and perpendicular to the plane where the second sewing needle 4 is moving. The first knitting needle 3 and the second knitting needle 4 cooperate with the steel leather needle 2 to carry out the interweaving motion to knit and form a chain stitch (sewing loop 8).

The movement process of the first sewing needle 3 and the second sewing needle 4 will be described below with reference to FIGS. 10-14 .

As shown in Figure 10, the fabric to be stitched is placed in a stitching position. The stitching position is below the first sewing needle 3, above the second sewing needle 4, and on the left side of the steel leather needle 2. The fabric to be seamed is supported by circular seam head teeth (not shown), which can be turned or moved so that the sewing loop 8 is always placed in the seaming position. Seen from the general direction of fabric travel, the travel direction of the fabric to be stitched is shown in the direction 16 (sewing direction) in the figure, that is, it is consistent with the main body direction of the steel sheath needle 2 .

As shown in FIG. 11 in two views with 90-degree directions, before sewing starts, the first sewing needle 3 and the second sewing needle 4 are at the starting position.

As shown in Figure 12, two views in a 90-degree direction, when sewing starts, the second sewing needle 4 moves upwards (see the right side view in Figure 12) and passes through the first sewing needle 3 with a The sewing thread is wound around the back of the second sewing needle 4 to form a loop, and the second sewing needle 4 passes through the loop of the fabric while the first sewing needle 3 moves backward (see Fig. 12 left side view), tighten the thread wound on the second sewing needle, and make the sewing thread on the first sewing needle 3 wrap around the steel sheath needle 2.

As shown in FIG. 13 , two views in two 90-degree directions, when both the first sewing needle 3 and the second sewing needle 4 have moved to the other end. As shown in Figure 14, the first sewing needle 3 moves forward (see the left side view of Figure 14), and the needle point passes through the sewing thread carried on the second sewing needle, so that the sewing thread is wound around the first sewing thread. Needle 3 needles back, forming a loop, while second sewing needle 4 moves downwards (see Fig. 14 right side view), tensioning the thread wound on the first sewing needle, and making the second sewing needle The stitching thread is wound on the steel sheath needle 2, so that the stitching thread on the first stitching needle 3 and the second stitching needle 4 can be interlaced to form a knot.

The automatic suturing device of the present invention also includes a thread cutting device 6 . Thread trimming is required after sewing and weaving. As shown in FIGS.

Fixed clip 61 and moving clip 61 form a scissors. When the moving clip 62 moves to overlap with the moving clip 61, thread trimming is performed.

The fixed shear piece 61 is fixed on the fixed seat 73, and the fixed shear piece 61 does not move, and the fixed seat 73 can be installed on the described casing of the sewing device 1, so that the fixed shear piece 61 is located below the first sewing needle 3, Easy thread cutting.

The moving shear piece 62 is installed on the upper end of the curved pull plate 65, the lower end of the curved pull plate 65 is connected to the upper end of the large angle pull plate 69, and the lower end of the large angle pull plate 69 is connected to the cylinder 71, and the telescopic movement is performed by the cylinder 71 so that the dynamic shear Tablet 62 movement. The thread trimmer 6 is in a closed state (as shown in Figure 15) when the cylinder 71 is air intake, and the thread trimmer 6 is in an open state (as shown in Figure 16) when the cylinder 71 is exhausted. The cylinder 71 is connected to the fixing seat 73 through the support plate 72 .

Preferably, in order to ensure that the thread cutting device 6 can be opened quickly when the air is withdrawn, a tension spring 70 is installed on the cylinder 71, and the tension spring 70 is connected between the lower end of the large-angle pull plate 69 and the cylinder 71, through which the tension spring The pulling force of 70 allows the scissors composed of the fixed shears 61 and the moving shears 61 to open rapidly after being closed, so as to get ready for the next thread trimming.

Preferably, the thread cutting device 6 of the present invention further includes a hook piece 63 and a curved push piece 64 . The crotch piece 63 and the moving shear piece 62 are attached and installed on the upper end of the curved pull plate 65, and the two can move together. The ends of the crotch piece 63 and the moving shear piece 62 are fixed on the hanging seat 68 by the latch 74, and the hanging seat 68 is fixed on the fixed seat 73. When the cylinder 71 moves, it drives the crotch piece 63 and the moving shear piece 62 to move around the latch 74 together. Slide out the cut position.

The curved push piece 64 is installed on the outside of the crotch piece 63, and is installed in close contact with the crotch piece 63, and the curved push piece 64 and the crotch piece 63 can move relatively. The middle section of the curved push piece 64 can also be fixed on the hanger 68 by a latch 74 . The end of the curved push piece 64 has a bifurcated structure, and the bifurcated structure accommodates the first end of the plectrum 67 .

The paddle 67 has an L-shaped structure, and the first end of the paddle 67 is locked in the bifurcated structure at the end of the curved push piece 64 . The second end of plectrum 67 is stuck between the eccentric tightening ring 66 of curved pull plate 65 and the upper end of large angle pull plate 69 (that is, the junction of large angle pull plate 69 and curved pull plate 65), the second end of plectrum 67 The stroke of motion of the end is also between the upper end of the eccentric tight ring 66 and the large angle pull plate 69.

The curved push piece 64 and the hook piece 63 move in opposite directions, which will be described in detail below.

As shown in Figures 15-16, before the thread trimming, the moving shear piece 62 and the crotch piece 63 are opened. When thread trimming is needed, the cylinder 71 advances, pushes the lower end of the large-angle pull plate 69, the upper end of the large-angle pull plate 69 descends, pulls the lower end of the curved pull plate 65, the curved pull plate 65 descends, and the moving shears 62 and the crotch hook 63 are moved Drive closer to the middle. On the other hand, when the curved pull plate 65 descends, the eccentric tight ring 66 descends, and then presses down the second end of the plectrum 67, correspondingly, the first end of the plectrum 67 pushes the bifurcated structure at the end of the curved push piece 64 to Swing to the left, and the curved pushing piece 64 draws closer to the middle to realize thread trimming.

After the thread trimming is completed, the air cylinder 71 deflates, withdraws outwards, pulls the lower end of the large-angle pull plate 69, the upper end of the large-angle pull plate 69 rises, and the upper end lifts the second end of the paddle 67, correspondingly, the second end of the paddle 67 One end pushes the bifurcated structure at the end of the curved push piece 64 to swing to the right, and the curved push piece 64 moves outward. Simultaneously, the upper end of large angle draw plate 69 rises, promotes the lower end of bend draw plate 65, and bend draw plate 65 rises, and moving shear piece 62 and crotch hook plate 63 are promoted to move outwards. Realize that thread trimmer 6 is opened. It can be seen from FIG. 16 that the positions of the curved push piece 64 and the crotch piece 63 can be staggered.

The front end of the curved push piece 64 is similar to the front end of the crotch piece 63, both have a crotch shape and the crotch faces inward (when the front end of the curved push piece 64 and the crotch piece 63 are opened, the direction of the crotch of the two faces each other), which plays the following role : Before finishing the thread trimming action, the curved push piece 64 promotes the stitching loop. At this moment, the moving shear piece 62, the hook piece 63 and the fixed shear piece 61 are not yet closed, leaving a little space, and the curved push piece 64 can make the sewing loop The loop is pushed out a length so that there is a safe length of stitched loop. In the thread trimming process, the front end of the crotch piece 63 is in the shape of a hook, which can catch the stitching loop 8 to prevent the stitching loop 8 from slipping out of the cutting position. By bending the push piece 64, after the thread trimming action is completed, the length of the sewing loop left at both ends of the fabric opening can be consistent, and the position of the eccentric tight ring 66 (that is, the travel range of the plectrum 67) can also be adjusted. Controls the length of stitching loops left at both ends of the fabric opening, which can be long or short.

Thread cutting device 6 is placed below the sewing point of sewing device 1 in the illustrated embodiment, and can also be placed above and on both sides. The distance between the thread-cutting plane or the point position of the thread-cutting device 6 and the needle point head 211 of the steel leather needle is preferably between 10.1-20mm, and the thread-cutting plane or the point position of the thread-cutting point is to the first sewing needle 3 The distance between the point where the movement of the second sewing needle 4 intersects is preferably between 15.1-25 mm. If the distance is too close, there will be mutual interference in the mechanical structure. If the distance is too far, the thread trimming device will not be able to cut the thread, and the thread trimming function will be lost. .

The invention realizes the function of automatically sewing the openings of cylindrical fabrics such as socks, and can automatically cut the sewing loops after the sewing is finished, and can freely adjust the length and size of the cut loops, which greatly improves the production efficiency of the fabric. There is no need to perform secondary processing on the fabric to form a finished product, which greatly reduces production costs and realizes the purpose of automatic production. The sewing speed is fast and the sewing is precise, which greatly improves the qualified rate of the fabric.

The embodiments described above are only preferred specific implementations of the present utility model. This description uses the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or " In other embodiments", all of them refer to one or more of the same or different embodiments according to the present disclosure. The usual changes and substitutions made by those skilled in the art within the scope of the technical solution of the utility model shall be included in the protection scope of the utility model.

Claims (10)

1. A thread trimmer, characterized in that, comprising: Fixing seat (73); Fixed clip (61), which is fixed on the holder (73); A moving shear (62), which is fixed on the holder (73) by a latch (74); Bending pull plate (65), the upper end of bending pull plate (65) is combined to the end of described movable shear piece (62); Large angle pull plate (69), the upper end of large angle pull plate (69) is combined to the lower end of described curved pull plate (65); When the lower end of the large corner pull plate (69) is pushed and pulled, the movable shear piece (62) is opened and closed relative to the fixed shear piece (61). 2. The thread cutting device according to claim 1, further comprising: A hook piece (63), which is installed together with the moving shear piece (62) and moves together; Bending push piece (64), it is fixed on the holder (73) by latch (74); Pick piece (67), the first end of pick piece (67) is combined with the end of curved push piece (64) to push and pull bend push piece (64), and the second end of pick piece (67) can be on the curved pull plate ( 65) and move between the upper end of the eccentric tight ring (66) and the large angle pull plate (69). 3. The thread cutting device according to claim 2, characterized in that, The heads of the hook piece (63) and the push piece (64) are hook-shaped, and the hooks are opposite. 4. The thread cutting device according to claim 3, characterized in that, When the lower end of the large-angle pull plate (69) is pushed, the moving shear piece (62) is close to the fixed shear piece (61), and the plectrum (67) pushes the curved push piece (64) to move closer to the middle. Before trimming, the Bending push piece (64) first contacts and releases the certain length of thread to be trimmed, then crotch piece (63) contacts and tightens thread to be trimmed, and moving clipper (62) and fixed clipper (61) trim the thread; When pulling the lower end of the large angle pull plate (69), the hook piece (63) and the moving shear piece (62) are away from the fixed shear piece (61), and the curved push piece (64) and the hook piece (63) move in the opposite direction . 5. The thread cutting device according to claim 4, further comprising: Cylinder (71), it is connected to the lower end of described large angle drawing plate (69); Extension spring (70), which connects the cylinder (71) and the large angle pull plate (69). 6. An automatic suturing device, characterized in that, comprising: The thread cutting device (6) according to any one of claims 1-4; A sewing device (1), which has a first sewing needle (3), a second sewing needle (4) and a steel leather needle (2) that cooperate with each other for knotting; The position of the thread cutting device (6) is close to the sewing point of the sewing device (1), and the sewing loop (8) is trimmed after the sewing of the sewing device (1) is completed. 7. The automatic sewing device according to claim 6, characterized in that, the sewing device (1) further comprises: The first connecting rod (52), its first end is connected to the second end of the long crank (53), the first end of the long crank (53) is equipped with the first needle holder (9), on the first needle holder (9) The first sewing needle (3) is installed; The second connecting rod (56), its first end is connected to the second end of the short crank (57), the first end of the short crank (57) is equipped with the second needle frame (10), on the second needle frame (10) Said second sewing needle (4) is installed. 8. Automatic sewing device according to claim 7, is characterized in that, also comprises motor device (5), and described motor device (5) comprises: Motor shaft; A large gear (51), which is connected to one end of the motor shaft, the large gear (51) has an eccentric mounting hole (511), and the eccentric mounting hole (511) is used to accommodate the second end of the first connecting rod (52); The small needle eccentric wheel (55), which is connected to the other end of the motor shaft, the small needle eccentric wheel (55) has an eccentric shaft end (551), and the second end of the eccentric shaft end (551) and the second connecting rod (56) combine together. 9. The automatic sewing device according to claim 8, further comprising: The pinion handwheel (54) is meshed with the large gear (51). 10. The automatic sewing device according to claim 6, characterized in that, The distance between the thread trimming plane or the thread trimming point of the thread trimming device (6) and the steel leather needle tip (211) of the steel leather needle (2) is between 10.1-20mm, and the thread trimming plane or thread trimming The distance from the point position to the point where the movement of the first knitting needle (3) intersects with the movement of the second knitting needle (4) is between 15.1-25 mm.

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