Back buckle machine

Abstract

The utility model discloses a back button machine, which belongs to the technical field of sewing equipment, and comprises a rack (1), an operating table (2) and an automatic feeding device (3), a sliding chute (6) is arranged on the operating table (2), the automatic feeding device (3) comprises a clamping mechanism (7), an adjusting mechanism (8), a fixing plate (9) and a transmission mechanism I (10), the clamping mechanism (7) comprises two pairs of claws (11), a mounting frame and a transmission component, the claws (11) are arranged in the sliding chute (6), and the fixing plate (9) is arranged on the mounting frame. The transmission assembly is connected with the hook claws (11) and arranged on the installation frame, the installation frame is connected with the adjusting mechanism (8), the installation frame and the adjusting mechanism (8) are arranged on the fixing plate (9), and the fixing plate (9) is connected with the first transmission mechanism (10). According to the cloth clamping device, cloth is fixed through the two sets of hook claws (11), meanwhile, the adjusting mechanism (8) is arranged, the cloth clamping device is suitable for cloth of different widths, cloth clamping is more stable, and the cloth clamping efficiency is improved. And the conveying precision is high, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing equipment technical field relates to a sewing mechanical equipment, specifically relates to a back buckle machine. BACKGROUND

[0002] The back buckle machine is a kind of production equipment specially used for underwear back buckle splicing processing, and the main process of the back buckle machine in the production process is to splice the garment fabric according to the required splicing, and then move the cloth to below the sewing machine head, the compression device is arranged at the sewing machine head, and the existing cloth placing part is spliced by manual operation, so that the product quality is difficult to control.

[0003] In order to solve the above problems in the prior art, the utility model discloses a cloth clamping and conveying device and back buckle machine, which is disclosed in the utility model patent with publication number CN209066118U, and includes hook claw mechanism combination, translation mechanism, the hook claw mechanism combination includes at least two groups of oppositely arranged hook claw mechanisms, total slide rail and hook claw mechanism connection adjusting frame, the hook claw mechanism connection adjusting frame connects all hook claw mechanisms into a whole, the whole can move on the total slide rail, the hook claw mechanism is provided with hook claw, hook claw left and right opening and closing structure and hook claw upper and lower compression structure, the hook claw penetrates through the workbench plate from the lower part, is located above the workbench plate table top, the hook claw left and right opening and closing structure and the hook claw upper and lower compression structure are located below the workbench plate table top, the translation mechanism is located below the workbench plate table top, is fixed on the side of hook claw mechanism combination, and can translate hook claw mechanism combination to preset position.The cloth clamping and conveying device has simple structure, is convenient to install and debug, occupies small space, has high degree of automation, and is safer to use.

[0004] The movement of the above-mentioned hook claw is mainly realized by spring, and the spring is prone to aging in the long-term use process, meanwhile, the device is provided with three pressing claws, which affects the precision of cloth transmission, causes material deviation, and affects the quality of products. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the technical problems in the prior art that the feeding process is prone to cloth deviation, the precision is not high during cloth transmission, and the quality of products in the sewing process is affected, and provides a back buckle machine.

[0006] In order to solve the above technical problems, the utility model provides a back buckle machine which is more stable and has higher precision, the back buckle machine includes a rack, the rack is provided with an operation table, an automatic feeding device, a sewing device and a pressing device, the automatic feeding device is arranged below the operation table, a chute is arranged on the operation table above the automatic feeding device, the pressing device is arranged above the operation panel and opposite to the automatic feeding device, the automatic feeding device includes a clamping mechanism, an adjusting mechanism for adjusting the clamping distance of the clamping mechanism, a fixed plate and a transmission mechanism one for driving the clamping mechanism to reciprocate along the chute direction, the clamping mechanism includes two pairs of hook claws which are arranged oppositely in parallel, a mounting frame and a transmission assembly for driving each hook claw to move vertically and swing, the hook claws are arranged in the chute, the mounting frame includes a mounting frame one and a mounting frame two, one pair of hook claws is arranged on the mounting frame one, another pair of hook claws is arranged on the mounting frame two, the mounting frame two is connected with the adjusting mechanism, and the mounting frame one, the mounting frame two and the adjusting mechanism are arranged on the fixed plate.

[0007] During the use of the equipment, the cloth and the back buckle to be sewn are placed on the operation table, the hook claws of the automatic feeding device are inclined to rise from the chute to the upper surface of the operation table and then swing to descend, so that the cloth is clamped, the cloth and the back buckle to be sewn together are distributed and fixed through the clamping mechanism, the position is determined, and then the cloth and the back buckle are conveyed to the sewing device below under the drive of the transmission mechanism one to be fed and sewn, the adjusting mechanism is arranged on the equipment, the clamping width between the hook claws can be adjusted according to different sizes of the cloth to be suitable for different sizes of the cloth, and the stability in the cloth conveying process is improved through the clamping of the two pairs of hook claws.

[0008] As a further improvement measure of the utility model, the hook claws in the above-mentioned back buckle machine include hook claw one, hook claw two, hook claw three and hook claw four, the structures of the hook claw one, the hook claw two, the hook claw three and the hook claw four are consistent and are in the shape of "L", including a hook part and a rod part, the "L" shaped hook claw can accurately fix the back buckle and the cloth, and ensure the conveying precision.

[0009] As a further improvement measure of the utility model, the transmission assembly in the above-mentioned back buckle machine includes a vertical transmission assembly and a swing transmission assembly, the vertical transmission assembly includes a vertical transmission assembly one for driving the hook claw one to move vertically, a vertical transmission assembly two for driving the hook claw two to move vertically, a vertical transmission assembly three for driving the hook claw three to move vertically, a vertical transmission assembly four for driving the hook claw four to move vertically, the structures of the vertical transmission assembly one, the vertical transmission assembly two, the vertical transmission assembly three and the vertical transmission assembly four are consistent, including a vertically arranged air cylinder one, a sliding block one and a vertically arranged slide rail one, in actual work, the expansion and contraction action of the air cylinder one drives the sliding block one to slide vertically on the slide rail one, and then drives the hook claws to move up and down, and the vertical transmission assembly can accurately control the lifting height of the hook claws.

[0010] As a further improved measure of the utility model, the swing transmission assembly in the back buckle machine comprises swing transmission assembly one for driving hook claw one to swing, swing transmission assembly two for driving hook claw two to swing, swing transmission assembly three for driving hook claw three to swing, swing transmission assembly four for driving hook claw four to swing, swing transmission assembly one, swing transmission assembly two, swing transmission assembly three and swing transmission assembly four are consistent in structure and comprise cylinder two arranged obliquely, sliding block one is slidably connected with slide rail one, the bottom of sliding block one is connected with cylinder one, the bottom end of the rod part of hook claw is rotatably connected with the top of sliding block one, cylinder two is arranged on sliding block one, the cylinder shaft of cylinder two is connected with the middle section of the rod part of hook claw, when cylinder two works, hook claw is pushed to swing with the rotary connection point of sliding block one as the shaft, thereby adjusting the grabbing angle of hook claw.

[0011] As a further improved measure of the utility model, hook claw one, vertical transmission assembly one, swing transmission assembly one, hook claw two, vertical transmission assembly two and swing transmission assembly two in the back buckle machine are arranged on mounting rack one, hook claw three, vertical transmission assembly three, swing transmission assembly three, hook claw four, vertical transmission assembly four and swing transmission assembly four are arranged on mounting rack two.

[0012] As a further improved measure of the utility model, the sliding groove in the back buckle machine comprises sliding groove one and sliding groove two, hook claw one and hook claw three are arranged in sliding groove one, and hook claw two and hook claw four are arranged in sliding groove two.

[0013] As a further improved measure of the utility model, the adjusting mechanism in the back buckle machine comprises screw rod one, sliding block two, slide rail two and driving piece one for driving screw rod one to rotate, mounting rack two is fixedly connected with sliding block two, sliding block two is slidably connected with slide rail two, sliding block two is threadedly connected with screw rod one, driving piece one drives screw rod one to rotate, sliding block two is moved along slide rail two by utilizing the screw transmission principle, thereby driving mounting rack two to move, the clamping distance between the two pairs of hook claws is changed, different size requirements can be quickly and accurately adjusted by changing the spacing, and the production efficiency and the versatility of the equipment are greatly improved.

[0014] As a further improved measure of the utility model, the transmission mechanism one in the back buckle machine comprises screw rod two, sliding block three, slide rail three and driving piece two for driving screw rod two to rotate, the fixed plate is fixedly connected with sliding block three, and sliding block three is threadedly connected with screw rod two.

[0015] As a further improvement of the utility model, the pressing device of the back buckle machine comprises a fixing frame, a pressing plate and a driving assembly for driving the pressing plate to press, a fixing plate perpendicular to a horizontal plane is arranged on the fixing frame, a sliding groove is arranged on the fixing plate, the pressing plate is provided with a connecting part, the connecting part is slidably connected with the sliding groove of the fixing plate, and the driving assembly is connected with the connecting part; when the back buckle is sent to the mounting position, the driving assembly works, the pressing plate is pushed to move downward along the sliding groove to fix the position of the cloth.

[0016] As a further improvement of the utility model, the bottom surface of the hook part of the hook claw is provided with sawteeth, the friction between the hook claw and the cloth is increased, and the cloth is better fixed.

[0017] Compared with the prior art, the utility model has the beneficial effects that: 1. the stability of the back buckle machine is improved by fixing the four hook claws, and the precision between the cloths during transportation is improved; 2. the clamping distance of the clamping mechanism can be flexibly adjusted through the adjusting mechanism, different sizes of underwear back buckle materials can be adapted, the precise structure design and stable operation of the devices guarantee the position precision and sewing quality of the underwear back buckle during the installation process, the installation error of the back buckle can be controlled in a very small range, the product quality difference caused by human factors is reduced, and the product quality and production efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a front view of the back buckle machine of the utility model.

[0019] Figure 2 is a top view of the back buckle machine of the utility model.

[0020] Figure 3 is a perspective view of the back buckle machine of the utility model Figure 1 .

[0021] Figure 4 is a perspective view of the back buckle machine of the utility model Figure 2 .

[0022] Figure 5 is a front view of the automatic feeding device of the utility model.

[0023] Figure 6 is a top view of the automatic feeding device of the utility model.

[0024] Figure 7 is a perspective view of the automatic feeding device of the utility model Figure 1 .

[0025] Figure 8 is a perspective view of the automatic feeding device of the utility model Figure 2 .

[0026] Figure 9 is a perspective view of the transmission assembly of the utility model.

[0027] BRIEF DESCRIPTION OF DRAWINGS: 1. rack; 2. operation platform; 3. automatic feeding device; 4. sewing device; 5. pressing device; 6. sliding groove; 7. clamping mechanism; 8. adjusting mechanism; 9. fixed plate; 10. transmission mechanism one; 11. hook claw; 111 hook claw one; 112 hook claw two; 113 hook claw three; 114 hook claw four; 12. mounting frame one; 13 mounting frame two; 14. vertical transmission assembly one; 15. vertical transmission assembly two; 16. vertical transmission assembly three; 17. vertical transmission assembly four; 18. air cylinder one; 19. sliding block one; 20. slide rail one; 21. swing transmission assembly one; 22. swing transmission assembly two; 23. swing transmission assembly three; 24. swing transmission assembly four; 25. air cylinder two; 26. sliding groove one; 27. sliding groove two; 28. lead screw one; 29. sliding block two; 30. slide rail two; 31. driving piece one; 32. lead screw two; 33. sliding block three; 34. slide rail three; 35. driving piece two; 36. fixed frame; 37. pressing plate; 38. driving assembly; 39. connecting portion; 40 hook portion; 41, rod portion. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the following will be further detailed in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0029] On the contrary, the utility model covers any substitution, modification, equivalent method and scheme defined by the claims on the essence and scope of the utility model. Further, in order to make the public have a better understanding of the utility model, some specific details are described in the following detailed description of the utility model. The utility model can also be completely understood without the description of these details for those skilled in the art.

[0030] As Figure 1 , Figure 2 , Figure 3 and Figure 4The back buckle machine shown includes a rack 1, which is provided with an operation table 2, an automatic feeding device 3, a sewing device 4 and a pressing device 5. The automatic feeding device 3 is arranged below the operation table 2, and a chute 6 is arranged above the automatic feeding device 3. The pressing device 5 is arranged above the operation panel and opposite to the automatic feeding device 3. The automatic feeding device 3 includes a clamping mechanism 7, an adjusting mechanism 8 for adjusting the clamping distance of the clamping mechanism 7, a fixed plate 9 and a transmission mechanism I 10 for driving the clamping mechanism 7 to reciprocate along the direction of the chute 6. The clamping mechanism 7 includes two pairs of parallel and oppositely arranged hook claws 11, a mounting frame and a transmission assembly for driving each hook claw 11 to move vertically and swing.

[0031] As shown in Figures 5-9 The hook claw 11 includes a hook claw I 111, a hook claw II 112, a hook claw III 113 and a hook claw IV 114. The hook claw I 111, the hook claw II 112, the hook claw III 113 and the hook claw IV 114 are identical in structure and have an “L” shape, including a hook portion 40 and a rod portion 41. The bottom surface of the hook portion 40 of the hook claw 11 is provided with a sawtooth. The “L” shaped hook claw 11 can accurately fix the back buckle and the cloth. The sawtooth can increase the friction between the hook claw 11 and the cloth, better fix the cloth and ensure the conveying accuracy.

[0032] As shown in Figures 5-9 The transmission assembly includes a vertical transmission assembly and a swinging transmission assembly. The vertical transmission assembly includes a vertical transmission assembly I 14 for driving the hook claw I 111 to move vertically, a vertical transmission assembly II 15 for driving the hook claw II 112 to move vertically, a vertical transmission assembly III 16 for driving the hook claw III 113 to move vertically and a vertical transmission assembly IV 17 for driving the hook claw IV 114 to move vertically. The vertical transmission assembly I 14, the vertical transmission assembly II 15, the vertical transmission assembly III 16 and the vertical transmission assembly IV 17 are identical in structure and include a vertically arranged air cylinder I 18, a sliding block I 19 and a vertically arranged sliding rail I 20. In actual work, the extension and retraction of the air cylinder I 18 drives the sliding block I 19 to slide vertically on the sliding rail I 20, thereby driving the hook claw 11 to move up and down. The vertical transmission assembly can accurately control the lifting height of the hook claw 11.

[0033] As shown in Figures 5-9The swing transmission assembly shown includes swing transmission assembly one 21 for driving hook claw one 111 to swing, swing transmission assembly two 22 for driving hook claw two 112 to swing, swing transmission assembly three 23 for driving hook claw three 113 to swing, and swing transmission assembly four 24 for driving hook claw four 114 to swing. Swing transmission assembly one 21, swing transmission assembly two 22, swing transmission assembly three 23, and swing transmission assembly four 24 are of the same structure, including an obliquely arranged cylinder two 25, a sliding block one 19 slidingly connected with a sliding rail one 20, the sliding block one 19 connected with the cylinder one 18 at the bottom, the rod part 41 of the hook claw 11 rotatably connected with the top of the sliding block one 19, the cylinder two 25 arranged on the sliding block one 19, and the cylinder shaft of the cylinder two 25 connected with the middle section of the rod part 41 of the hook claw 11. When the cylinder two 25 works, the hook claw 11 is pushed to swing with the rotating connection point of the sliding block one 19 as the axis, so as to adjust the angle of the hook claw 11 and make the hook claw 11 press the cloth.

[0034] The overall movement process of the transmission assembly is that first, the cylinder one 18 drives the sliding block one 19 to move upward to drive the hook claw 11 to extend out of the sliding groove 6, then the cylinder two 25 extends to control the hook claw to swing so that the hook part 40 is perpendicular to the horizontal plane, and finally the cylinder one 18 is retracted to clamp the cloth by the hook part 40 of the hook claw 11.

[0035] As shown in Figures 5-9 The mounting frame includes a mounting frame one 12 and a mounting frame two 13. The hook claw one 111, the vertical transmission assembly one 14, the swing transmission assembly one 21, the hook claw two 112, the vertical transmission assembly two 15, and the swing transmission assembly two 22 are arranged on the mounting frame one 12. The hook claw three 113, the vertical transmission assembly three 16, the swing transmission assembly three 23, the hook claw four 114, the vertical transmission assembly four 17, and the swing transmission assembly four 24 are arranged on the mounting frame two 13.

[0036] As shown in Figure 4 And Figure 5 The sliding groove 6 includes a sliding groove one 26 and a sliding groove two 27. The hook claw one 111 and the hook claw three 113 are arranged in the sliding groove one 26, and the hook claw two 112 and the hook claw four 114 are arranged in the sliding groove two 27.

[0037] As shown in Figures 5-9 The adjusting mechanism 8 includes a lead screw one 28, a sliding block two 29, a sliding rail two 30, and a driving part one 31 for driving the lead screw one 28 to rotate. The mounting frame two 13 is fixedly connected with the sliding block two 29, the sliding block two 29 is slidingly connected with the sliding rail two 30, and the sliding block two 29 is threadedly connected with the lead screw one 28. The driving part one 31 drives the lead screw one 28 to rotate, and the sliding block two 29 moves along the sliding rail two 30 by using the screw transmission principle, thereby driving the mounting frame two 13 to move and changing the clamping distance between the two pairs of hook claws 11. By changing the distance, different sizes can be quickly and accurately adjusted to greatly improve the production efficiency and the versatility of the equipment.

[0038] As Figures 5-9 The mounting rack one 12, the mounting rack two 13 and the adjusting mechanism 8 are arranged on the fixed plate 9, the fixed plate 9 is connected with the transmission mechanism one 10, the transmission mechanism one 10 comprises a screw rod two 32, a sliding block three 33, a sliding rail three 34 and a driving piece two 35 for driving the screw rod two 32 to rotate, the fixed plate 9 is fixedly connected with the sliding block three 33, and the sliding block three 33 is threadedly connected with the screw rod two 32.

[0039] As Figure 3 , Figure 4 As shown in the figure, the pressing device 5 comprises a fixed frame 36, a pressing plate 37 and a driving assembly 38 for driving the pressing plate 37 to press, the fixed frame 36 is provided with the fixed plate 9 in a vertical and horizontal plane, the fixed plate 9 is provided with the sliding groove 6, the pressing plate 37 is provided with a connecting part 39, the connecting part 39 is slidably connected with the sliding groove 6 of the fixed plate 9, and the driving assembly 38 is connected with the connecting part 39; when the cloth is sent to the mounting position, the driving assembly 38 works to push the pressing plate 37 to move downwards along the sliding groove 6 to fix the position of the cloth.

[0040] During use of the equipment, the cloth and the back buckle to be sewn are placed on the operation table 2, the hook claws 11 of the automatic feeding device 3 are inclined to rise to the upper surface of the operation table 2 from the sliding groove 6 and then swing downwards to clamp the cloth, the clamping mechanism 7 is used to distribute and fix the cloth and the back buckle to be sewn together, and the cloth and the back buckle are sent to the sewing device 4 under the driving of the transmission mechanism one 10 to be fed and sewn; the adjusting mechanism 8 is arranged on the equipment and can be used to adjust the clamping width between the hook claw one 111 and the hook claw three 113 and between the hook claw two 112 and the hook claw four 114 according to different sizes of the cloth, so that the equipment is suitable for different sizes of the cloth, and the stability of the cloth during conveying is improved through clamping by the hook claw one 111, the hook claw two 112, the hook claw three 113 and the hook claw four 114.

[0041] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and some modifications and improvements can be made without departing from the utility model for those skilled in the art, and these should be regarded as belonging to the protection scope of the utility model.

Claims

1. A back tacking machine comprising a frame (1) provided with an operating table (2), characterized in that, The back buckling machine further comprises an automatic feeding device (3), a sewing device (4) and a pressing device (5) arranged on the rack (1), the automatic feeding device (3) is arranged below the operation table (2), a chute (6) is arranged above the automatic feeding device (3), the pressing device (5) is arranged above the operation panel and opposite to the automatic feeding device (3), the automatic feeding device (3) comprises a clamping mechanism (7), an adjusting mechanism (8) for adjusting the clamping distance of the clamping mechanism (7), a fixed plate (9) and a transmission mechanism I (10) for driving the clamping mechanism (7) to reciprocate along the direction of the chute (6), the clamping mechanism (7) comprises two pairs of parallel and oppositely arranged claws (11), a mounting frame and a transmission assembly for driving each claw (11) to vertically move and swing, the claws (11) are arranged in the chute (6), the mounting frame comprises a mounting frame I (12) and a mounting frame II (13), one pair of claws (11) is arranged on the mounting frame I (12), the other pair of claws (11) is arranged on the mounting frame II (13), the mounting frame II (13) is connected with the adjusting mechanism (8), the mounting frame I (12), the mounting frame II (13) and the adjusting mechanism (8) are arranged on the fixed plate (9), and the fixed plate (9) is connected with the transmission mechanism I (10).

2. The back-buckle machine according to claim 1, wherein, The claws (11) comprise a claw I (111), a claw II (112), a claw III (113) and a claw IV (114), the claw I (111), the claw II (112), the claw III (113) and the claw IV (114) are identical in structure and are in the shape of "L", comprising a hook portion (40) and a rod portion (41).

3. The back-buckle machine of claim 2, wherein, The transmission assembly comprises a vertical transmission assembly and a swing transmission assembly, the vertical transmission assembly comprises a vertical transmission assembly I (14) for driving the claw I (111) to vertically move, a vertical transmission assembly II (15) for driving the claw II (112) to vertically move, a vertical transmission assembly III (16) for driving the claw III (113) to vertically move and a vertical transmission assembly IV (17) for driving the claw IV (114) to vertically move, the vertical transmission assembly I (14), the vertical transmission assembly II (15), the vertical transmission assembly III (16) and the vertical transmission assembly IV (17) are identical in structure and comprise a vertically arranged air cylinder I (18), a sliding block I (19) and a vertically arranged sliding rail I (20).

4. The back tacking machine of claim 3, wherein, The swing transmission assembly comprises a swing transmission assembly one (21) for swinging the hook claw one (111), a swing transmission assembly two (22) for swinging the hook claw two (112), a swing transmission assembly three (23) for swinging the hook claw three (113), and a swing transmission assembly four (24) for swinging the hook claw four (114). The swing transmission assembly one (21), the swing transmission assembly two (22), the swing transmission assembly three (23), and the swing transmission assembly four (24) are identical in structure and comprise an inclined cylinder two (25). A sliding block one (19) is slidably connected with a sliding rail one (20). The bottom of the sliding block one (19) is connected with a cylinder one (18). The bottom end of a rod part (41) of the hook claw (11) is rotatably connected with the top of the sliding block one (19). The cylinder two (25) is arranged on the sliding block one (19). The cylinder shaft of the cylinder two (25) is connected with the middle section of the rod part (41) of the hook claw (11).

5. The back-buckle machine of claim 4, wherein, The hook claw one (111), the vertical transmission assembly one (14), the swing transmission assembly one (21), the hook claw two (112), the vertical transmission assembly two (15), and the swing transmission assembly two (22) are arranged on a mounting rack one (12). The hook claw three (113), the vertical transmission assembly three (16), the swing transmission assembly three (23), the hook claw four (114), the vertical transmission assembly four (17), and the swing transmission assembly four (24) are arranged on a mounting rack two (13).

6. The back-buckle machine of claim 5, wherein, The sliding groove (6) comprises a sliding groove one (26) and a sliding groove two (27). The hook claw one (111) and the hook claw three (113) are arranged in the sliding groove one (26). The hook claw two (112) and the hook claw four (114) are arranged in the sliding groove two (27).

7. The back tacking machine of claim 6, wherein, The adjusting mechanism (8) comprises a screw rod one (28), a sliding block two (29), a sliding rail two (30), and a driving part one (31) for driving the screw rod one (28) to rotate. The mounting rack two (13) is fixedly connected with the sliding block two (29). The sliding block two (29) is slidably connected with the sliding rail two (30). The sliding block two (29) is threadedly connected with the screw rod one (28).

8. The back tacking machine of claim 7, wherein, The transmission mechanism one (10) comprises a screw rod two (32), a sliding block three (33), a sliding rail three (34), and a driving part two (35) for driving the screw rod two (32) to rotate. The fixed plate (9) is fixedly connected with the sliding block three (33). The sliding block three (33) is threadedly connected with the screw rod two (32).

9. A back tacking machine according to any one of claims 1-8, characterized in that, The pressing device (5) comprises a fixed frame (36), a pressing plate (37), and a driving assembly (38) for driving the pressing plate (37) to press. The fixed plate (9) is arranged on the fixed frame (36) and has a vertical horizontal surface. The sliding groove (6) is arranged on the fixed plate (9). The pressing plate (37) is provided with a connecting part (39). The connecting part (39) is slidably connected with the sliding groove (6) of the fixed plate (9). The driving assembly (38) is connected with the connecting part (39).

10. The back tacking machine of claim 9, wherein, The bottom surface of the hook part (40) of the hook claw (11) is provided with sawteeth.

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