Automatic thread trimming, presser foot lifting and tooth under arching device and sewing machine

Abstract

The utility model belongs to sewing equipment technical field, especially point to a kind of automatic thread trimming, lift presser foot and tooth under arch device and sewing machine;Including driving motor, cam mechanism, ratchet mechanism;Ratchet mechanism includes the ratchet wheel that is sleeved on rotary output end and does not rotate with rotary output end, keeps group installed on driving piece mounting plate and follow-up piece set on ratchet wheel, tooth under arch drive section drives tooth under arch mechanism action outside still can pass through follow-up piece driving ratchet wheel, keeps group action to adjust tooth height, rotary output end drives cam mechanism rotation, to make lift presser foot mechanism and thread trimming mechanism independent lift presser foot and thread trimming action and do not interfere with each other;The utility model is driven by driving motor to reach the purpose of automatic adjustment tooth height, solve the technical problem that professional technical personnel needs to manually adjust tooth height to machine in prior art, reduce the dependence of processing site to machine repair personnel, improve the operation efficiency of clothing factory.

Description

Technical fields:

[0001] This utility model belongs to the field of sewing equipment technology, specifically referring to an automatic thread cutting, presser foot lifting, and tooth lowering device and sewing machine. Background technology:

[0002] In the garment manufacturing industry, sewing machines are core production equipment, and their performance directly affects the efficiency and quality of garment production. In recent years, with the rapid changes in market demand, the garment industry has shown a trend of "small-batch, fast-response," which has led to garment factories frequently needing to change fabrics of different thicknesses and materials for sewing. Due to the significant differences in the characteristics of different fabrics (such as elasticity, thickness, and surface smoothness), sewing machines often need to adjust the height of the feed dog when changing fabrics to ensure a stable feeding effect and avoid problems such as skipped stitches, thread breakage, fabric wrinkling, or poor feeding.

[0003] Currently, adjusting the feed dog height typically relies on manual operation, requiring maintenance personnel to manually adjust relevant parts of the sewing machine. While maintenance personnel possess the professional skills to accurately perform the adjustments, in actual production, garment factories have a limited number of maintenance personnel compared to the large number of sewing machines on the production line. When frequent adjustments to the feed dog height are needed to accommodate different fabrics, maintenance personnel often cannot respond promptly, leading to prolonged machine downtime and significantly impacting production efficiency. Furthermore, manual adjustment also suffers from cumbersome operation, low efficiency, and susceptibility to human error affecting sewing quality. Utility model content:

[0004] The purpose of this invention is to provide an automatic thread trimming, presser foot lifting, and tooth arching device and sewing machine that is driven by a rotary drive to adjust the height of the teeth.

[0005] This utility model is implemented as follows:

[0006] An automatic thread cutting, presser foot lifting, and tooth lowering device includes:

[0007] Rotary drive component, including a rotary output end;

[0008] A cam mechanism includes a tooth lower arch cam, a pressure foot lifting cam, and a wire cutting cam disposed at the rotary output end. The tooth lower arch cam has a tooth lower arch drive section and a tooth lower arch base circle section, the tooth lower arch drive section being used to drive the tooth lower arch mechanism to move; the pressure foot lifting cam has a pressure foot lifting drive section and a pressure foot lifting base circle section, the pressure foot lifting drive section being used to drive the pressure foot lifting mechanism to move; the wire cutting cam has a wire cutting drive section and a wire cutting base circle section, the wire cutting drive section being used to drive the wire cutting mechanism to move.

[0009] The ratchet mechanism includes a ratchet mounted on the rotating output end that does not rotate with the rotating output, a retaining assembly mounted on the drive mounting plate, and a follower mounted on the ratchet. In addition to driving the tooth lower arch mechanism, the tooth lower arch drive section can also drive the ratchet and retaining assembly to adjust the tooth height through the follower.

[0010] The rotary output end drives the cam mechanism to rotate, so that the presser foot lifting mechanism and the wire cutting mechanism can independently perform the presser foot lifting and wire cutting actions without interfering with each other.

[0011] In the above-mentioned automatic wire cutting, presser foot lifting, and tooth lowering device, the ratchet has multiple ratchet teeth and a front reset groove and a rear reset groove located at both ends of the multiple ratchet teeth. The retaining group includes a limiting block rotatably mounted on the drive component mounting plate. The upper end of the limiting block is connected to the drive component mounting plate through a reset spring. A reset torsion spring for driving the ratchet to reset is provided between the rotary output end and the ratchet.

[0012] In the aforementioned automatic wire cutting, presser foot lifting, and tooth lowering device, the follower is a top pin, which is disposed on the side of the ratchet adjacent to the tooth lowering cam.

[0013] In the aforementioned automatic wire cutting, presser foot lifting, and tooth lowering device, the ratchet is mounted on the rotating output end via a sleeve, and one end of the sleeve is fixed to the drive component mounting plate.

[0014] In the aforementioned automatic wire cutting, presser foot lifting, and tooth lowering device, the presser foot lifting mechanism includes a presser foot lifting lever, a presser foot lifting crank, and a presser foot lifting roller that contacts the outer cam surface of the presser foot cam. The presser foot lifting roller is located at one end of the presser foot lifting lever. One end of the presser foot lifting lever extends to one side of the presser foot cam, and the other end rotates around the axis of the presser foot shaft. The presser foot lifting crank is fixed on the presser foot shaft. The presser foot lifting crank and the other end of the presser foot lifting lever abut against each other, driving the presser foot shaft to rotate in one direction. The presser foot shaft is connected to the presser foot via a presser foot arm.

[0015] In the above-mentioned automatic wire cutting, presser foot lifting, and tooth lowering device, the wire cutting mechanism includes a first drive lever and a second drive lever rotatably mounted on the housing. The first drive lever is in contact with the outer cam surface of the wire cutting cam. One end of the second drive lever is located below the first drive rod, and the other end is connected to one end of the wire cutting shaft through a first connecting rod and a first crank. The other end of the wire cutting shaft is provided with a moving blade.

[0016] In the aforementioned automatic wire cutting, presser foot lifting, and tooth lowering device, one end of the second drive lever is provided with a ball head, the bottom surface of the first drive lever has an arc-shaped surface, and the ball head is located below the arc-shaped surface.

[0017] In the aforementioned automatic wire cutting, presser foot lifting, and tooth lowering device, the tooth lowering mechanism includes a tooth adjusting lever mounted on the drive component mounting plate. One end of the tooth adjusting lever is rotatably connected to the drive component mounting plate, and the other end is connected to the tooth adjusting eccentric shaft via a second connecting rod and a second crank. The tooth adjusting eccentric shaft is connected to a slide groove at one end of the feeding tooth holder and the differential tooth holder via a slider. The other ends of the feeding tooth holder and the differential tooth holder are respectively provided with a feeding tooth and a differential tooth.

[0018] Another objective of this invention is to provide a sewing machine that includes the aforementioned automatic thread trimming, presser foot lifting, and tooth lowering device.

[0019] The outstanding advantages of this utility model compared to the prior art are:

[0020] This invention utilizes a tooth-lowering mechanism that drives a ratchet mechanism to automatically adjust the tooth height. This solves the technical problem in existing technologies where manual adjustment of the tooth height is required by specialized technicians, reducing reliance on maintenance personnel at the processing site and improving the operational efficiency of garment factories. Furthermore, this invention can also achieve thread cutting, presser foot lifting, and tooth-lowering actions using the same motor, further improving production efficiency and reducing production costs for enterprises. Attached image description:

[0021] Figure 1 This is a schematic diagram of the automatic wire cutting, presser foot lifting, and tooth lowering device of this utility model;

[0022] Figure 2 This is a schematic diagram of the automatic wire cutting, presser foot lifting, and tooth lowering device of this utility model installed on the machine housing;

[0023] Figure 3 This is a schematic diagram of the presser foot of this utility model in the raised state;

[0024] Figure 4 This is a schematic diagram illustrating the wire-cutting action of this utility model;

[0025] Figure 5 This is a schematic diagram of the tooth arching process implemented by this utility model;

[0026] Figure 6 This is a schematic diagram of the tooth height adjustment to a thin material state according to this utility model;

[0027] Figure 7 This is a schematic diagram of the tooth height adjustment to the medium-thickness material state according to this utility model;

[0028] Figure 8 This is a schematic diagram of the tooth height adjustment to the thick material state according to this utility model;

[0029] Figure 9This is a schematic diagram showing the lower end of the limiting block of this utility model located in the front reset groove;

[0030] Figure 10 This is a schematic diagram showing the lower end of the limiting block of this utility model located in the rear reset groove;

[0031] Figure 11 This is a schematic diagram showing the lower end of the limiting block of this utility model engaging with the ratchet corresponding to the thick material;

[0032] Figure 12 This is an exploded view of the ratchet mechanism of this utility model.

[0033] In the diagram: 1. Rotary drive component; 2. Rotary output end; 3. Drive component mounting plate; 4. Housing; 5. Lower tooth arch cam; 6. Presser foot lifting cam; 7. Wire cutting cam; 8. Lower tooth arch drive section; 9. Lower tooth arch base circle section; 10. Presser foot lifting drive section; 11. Presser foot lifting base circle section; 12. Presser foot; 13. Wire cutting drive section; 14. Wire cutting base circle section; 15. Ratchet; 16. Top pin; 17a. Front reset groove; 17b. Rear reset groove; 18. Ratchet; 19. Limit block 20. Return spring; 21. Presser foot lifting lever; 22. Presser foot lifting crank; 23. Presser foot lifting roller; 24. Presser foot shaft; 25. Presser foot arm; 26. First drive lever; 27. Second drive lever; 28. First connecting rod; 29. ​​First crank; 30. Wire cutting shaft; 31. Moving blade; 32. Ball head; 33. Tooth adjustment lever; 34. Second connecting rod; 35. Second crank; 36. Tooth adjustment eccentric shaft; 37. Slider; 38. Slide groove; 39. Return torsion spring; 40. Sleeve. Detailed implementation method:

[0034] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —12:

[0035] Example 1:

[0036] This embodiment provides an automatic wire cutting, presser foot lifting, and tooth lowering device, which includes a rotary drive component 1, a ratchet locking mechanism, and a cam mechanism. The rotary drive component 1 has a rotary output end 2. The rotary drive component 1 is generally a drive motor, and the rotary output end 2 is the motor shaft. The rotary drive component 1 is mounted on the housing 4 via a drive component mounting plate 3.

[0037] The cam mechanism includes a tooth-lowering cam 5, a pressure foot lifting cam 6, and a wire-cutting cam 7, all mounted on the rotary output end 2. The tooth-lowering cam 5 has a tooth-lowering driving section 8 and a tooth-lowering base circle section 9. The tooth-lowering driving section 8 is used to drive the tooth-lowering mechanism to perform tooth-lowering and adjust tooth height. The pressure foot lifting cam 6 has a pressure foot lifting driving section 10 and a pressure foot lifting base circle section 11. The pressure foot lifting driving section 10 is used to drive the pressure foot lifting mechanism to lift the pressure foot, and the height of the pressure foot 12 can be adjusted according to the distance from the pressure foot lifting driving section 10 to the center of the pressure foot lifting cam 6. The wire-cutting cam 7 has a wire-cutting driving section 13 and a wire-cutting base circle section 14. The wire-cutting driving section 13 is used to drive the wire-cutting mechanism to perform wire-cutting.

[0038] The ratchet mechanism includes a ratchet 15 mounted on the rotating output end 2 and not rotating with it, a retaining assembly mounted on the drive mounting plate 2, and a follower mounted on the ratchet 15. The tooth lowering drive section 8, in addition to driving the tooth lowering mechanism, can also drive the ratchet 15 and retaining assembly via the follower to adjust the tooth height. Adjusting the tooth height triggers the tooth lowering and presser foot lifting mechanisms.

[0039] Specifically, the ratchet 15 is mounted on the rotary output end 2 via a sleeve 40, and one end of the sleeve 40 is fixed to the drive component mounting plate 3.

[0040] In this embodiment, the follower is a top pin 16, which is disposed on the side of the ratchet 15 adjacent to the lower tooth arch cam. One end of the top pin 16 is mounted on the ratchet 15, and the other end is suspended in the air to facilitate interference with the lower tooth arch drive section 8 and to follow the lower tooth arch cam 5.

[0041] The rotary output end 2 drives the cam mechanism to rotate, so that the presser foot lifting mechanism and the wire cutting mechanism can independently perform the presser foot lifting and wire cutting actions without interfering with each other.

[0042] The ratchet 15 of this invention has multiple ratchet teeth 18 and front reset grooves 17a and rear reset grooves 17b located at both ends of the multiple ratchet teeth 18. The retaining assembly includes a limiting block 19 rotatably mounted on the drive component mounting plate 2. The upper end of the limiting block 19 is connected to the drive component mounting plate 2 via a reset spring 20. The lower end of the limiting block 19 can engage with the ratchet teeth 18 to ensure that the ratchet 15 is kept in the current position, thereby maintaining the current tooth height. When the lower end of the limiting block 19 is located in the front reset groove 17a, the limiting block 19 releases its restriction on the ratchet 15, and the ratchet 15 is driven to reset by the reset structure. At this time, the lower end of the limiting block 19 is located in the rear reset groove 17b, and the teeth are at the initial height.

[0043] It should be noted that one end of the return spring 20 is mounted on the drive component mounting plate 2 by a screw. The return structure uses a return torsion spring 39.

[0044] In this embodiment, the ratchet 15 has three ratchet teeth 18, corresponding to tooth heights of 0.8mm, 1.0mm, and 1.2mm (thin, medium-thick, and thick materials), respectively, to accommodate sewing fabrics of different thicknesses. From the rear reset groove 17b to the front reset groove 17a, the order is thick material, medium-thick material, and thin material. When the tooth height is adjusted from thin material to thick material, the ratchet 15 first rotates until the lower end of the limiting block enters the front reset groove 17a. The reset structure drives the ratchet 15 to reset. At this time, the lower end of the limiting block 19 enters the rear reset groove 17b, and the teeth are at the initial height. Continuing to rotate the lower tooth arch cam 5 clockwise, the lower end of the limiting block 19 engages with the ratchet tooth 13 corresponding to the thick material.

[0045] This invention utilizes a tooth-lowering mechanism to drive a ratchet mechanism, automatically adjusting the tooth height. This solves the technical problem in existing technologies where manual tooth height adjustment by specialized technicians is required, reducing reliance on maintenance personnel at the processing site and improving the operational efficiency of garment factories. Furthermore, this invention can also achieve thread-cutting and presser foot lifting actions using the same motor, further improving production efficiency and reducing production costs for enterprises.

[0046] Furthermore, the presser foot mechanism includes a presser foot lever 21, a presser foot crank 22, and a presser foot roller 23 that contacts the outer cam surface of the presser foot cam 6. The presser foot roller 23 is disposed at one end of the presser foot lever 21. One end of the presser foot lever 21 extends to one side of the presser foot cam 6, and the other end rotates around the axis of the presser foot shaft 24. The presser foot crank 22 is fixed on the presser foot shaft 24. The presser foot crank 22 and the other end of the presser foot lever 21 abut against each other to drive the presser foot shaft 24 to rotate in one direction. The presser foot shaft 24 is connected to the presser foot 12 through the presser foot arm 25.

[0047] When the lifting foot cam 6 rotates to the point where the lifting foot drive section 10 contacts and connects with the lifting foot roller 23, the lifting foot drive section 10 drives the lifting foot lever 21 to rotate downward around the pressing foot shaft 24, which in turn drives the lifting foot crank 22 and the pressing foot shaft 24 to rotate, causing the pressing foot arm 25 to rotate upward around the pressing foot shaft 24 and the pressing foot 12 to be lifted upward.

[0048] When the lifting foot cam 6 rotates to the point where the lifting foot base segment 11 contacts and connects with the lifting foot roller 23, the lifting foot lever 21 does not move, and the pressing foot 12 also does not move.

[0049] In this utility model, the wire cutting mechanism includes a first driving lever 26 and a second driving lever 27 rotatably mounted on the housing 4. The first driving lever 26 is in contact with the outer cam surface of the wire cutting cam 7. One end of the second driving lever 27 is located below the first driving lever 26, and the other end is connected to one end of the wire cutting shaft 30 through the first connecting rod 28 and the first crank 29. The other end of the wire cutting shaft 30 is provided with a moving blade 31.

[0050] When cutting the thread, the thread cutting cam 7 rotates until the thread cutting drive section 13 contacts the first drive lever 26. The first drive lever 26 rotates downward, driving the second drive lever 27 and its connecting end to rotate downward and the other end to rotate upward. This, in turn, drives the thread cutting shaft 30 to rotate through the first connecting rod 28 and the first crank 29, thereby driving the moving blade 31 to cooperate with the fixed blade to cut the thread.

[0051] When the wire-cutting cam 7 rotates to the point where the wire-cutting base circle 14 contacts the first drive lever 26, the first drive lever 26 does not move.

[0052] It should be noted that after the first drive lever 26 rotates downward, it is reset by a reset component (such as a torsion spring).

[0053] The second drive lever 27 of this invention has a ball head 32 at one end, and the bottom surface of the first drive lever 26 has an arc-shaped surface. The ball head 32 is located below the arc-shaped surface, making the transmission between the two smoother.

[0054] Furthermore, the tooth lowering mechanism of this utility model includes a tooth adjusting lever 33 disposed on the drive component mounting plate 2. One end of the tooth adjusting lever 33 is rotatably connected to the drive component mounting plate 2, and the other end is connected to the tooth adjusting eccentric shaft 36 through the second connecting rod 34 and the second crank 35. The tooth adjusting eccentric shaft 36 is connected to the slide groove 38 at one end of the feeding tooth frame and the differential tooth frame through the slider 37. The other end of the feeding tooth frame and the differential tooth frame are respectively provided with the feeding tooth and the differential tooth.

[0055] The working principle of this utility model:

[0056] The rotating shaft 2 of the rotary drive 1 rotates counterclockwise, driving the wire-cutting cam 7 to rotate counterclockwise. When the wire-cutting drive section 13 on the wire-cutting cam 7 acts on the first lever 25, the first lever 25 rotates downward, driving one end of the second lever 26 to also rotate downward. The other end of the second lever 26 drives the wire-cutting shaft 30 to rotate through the first connecting rod 28 and the first crank 29, ultimately realizing the rotation of the moving blade 31 and its cooperation with the fixed blade to cut the wire. During the wire cutting process, the lifting foot base circle section 11 of the lifting foot cam 6 acts on the lifting foot lever 21, preventing it from rotating, and the lifting foot mechanism does not move; the tooth lower arch cam 5 rotates in the direction away from the top pin 16, the ratchet 15 does not rotate, the tooth adjusting lever 33 does not move, and the tooth height is at its original height.

[0057] The rotating shaft 2 of the rotary drive 1 rotates clockwise, and the lifting foot drive section 10 of the lifting foot cam 6 drives one end of the lifting foot lever 21 to rotate downward through the lifting foot roller 23, thereby driving the pressing foot shaft 24 to rotate and causing the pressing foot arm 25 to rotate upward around the pressing foot shaft 24, lifting the pressing foot 12 located at the other end of the pressing foot arm 25. During the lifting of the pressing foot, the wire-cutting base circle section 14 of the wire-cutting cam 7 acts on the first lever 25, and the first lever 25 does not rotate, so the wire-cutting mechanism does not operate; the rotating shaft 2 continues to rotate clockwise, and the tooth-lowering drive section 8 of the tooth-lowering cam 5 drives the tooth-adjusting lever 33 to operate, causing the lower teeth to lower. At this time, the ratchet mechanism does not operate.

[0058] After the lower tooth arch is achieved, the rotating shaft 2 of the rotary drive 1 continues to rotate clockwise. The lower tooth arch drive section 8 of the lower tooth arch cam 5 rotates until it abuts against the top pin 16. The clockwise rotation of the lower tooth arch cam 5 drives the ratchet 15 to rotate synchronously. At the same time, the lower tooth arch drive section 8 drives the tooth adjusting lever 33 to rotate, which in turn drives the tooth adjusting eccentric shaft 36 to rotate. The rotation amplitude of the tooth adjusting lever 33 controls different tooth heights. At this time, the limit block 14 meshes with different ratchet teeth 18 of the ratchet 15 to achieve multi-level tooth height adjustment. When adjusting the tooth height, the wire cutting cam 7 has its wire cutting base circle section 14 in contact with the first lever 25, and the wire cutting mechanism does not move. However, the pressure foot lifting drive section of the pressure foot lifting cam 6 is in contact with the pressure foot lifting lever 21, and the pressure foot is lifted.

[0059] Example 2:

[0060] This embodiment provides a sewing machine, including the automatic thread trimmer, presser foot lifter, and tooth lowering device described in the above embodiment.

[0061] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An automatic wire cutting, presser foot lifting, and tooth lowering device, characterized in that: include: A rotary drive (1) includes a rotary output end (2); The cam mechanism includes a tooth lower arch cam (5), a pressure foot lifting cam (6), and a wire cutting cam (7) disposed at the rotary output end (2). The tooth lower arch cam (5) has a tooth lower arch driving section (8) and a tooth lower arch base circle section (9). The tooth lower arch driving section (8) is used to drive the tooth lower arch mechanism. The pressure foot lifting cam (6) has a pressure foot lifting section (10) and a pressure foot lifting base circle section (11). The pressure foot lifting section (10) is used to drive the pressure foot lifting mechanism. The wire cutting cam (7) has a wire cutting driving section (13) and a wire cutting base circle section (14). The wire cutting driving section (13) is used to drive the wire cutting mechanism. The ratchet (15) mechanism includes a ratchet (15) mounted on the rotary output end (2) and not rotating with the rotary output end (2), a retaining group mounted on the drive mounting plate (3), and a follower set on the ratchet (15). In addition to driving the tooth lower arch mechanism, the tooth lower arch drive section (8) can also drive the ratchet (15) and retaining group to adjust the tooth height by the follower. The rotary output end (2) drives the cam mechanism to rotate so that the pressing foot lifting mechanism and the wire cutting mechanism can independently perform the pressing foot lifting and wire cutting actions without interfering with each other.

2. The automatic thread cutting, presser foot lifting, and tooth lowering device according to claim 1, characterized in that: The ratchet (15) has multiple ratchet teeth (18) and a front reset groove (17a) and a rear reset groove (17b) located at both ends of the multiple ratchet teeth (18). The retaining assembly includes a limiting block (19) rotatably mounted on the drive component mounting plate (3). The upper end of the limiting block (19) is connected to the drive component mounting plate (3) by a reset spring (20). A reset torsion spring (39) for driving the ratchet (15) to reset is provided between the rotary output end (2) and the ratchet (15).

3. An automatic wire cutting, presser foot lifting, and tooth lowering device according to claim 1 or 2, characterized in that: The follower is a top pin (16), which is disposed on the side of the ratchet (15) adjacent to the toothed lower arch cam (5).

4. The automatic thread cutting, presser foot lifting, and tooth lowering device according to claim 1, characterized in that: The ratchet (15) is mounted on the rotary output end (2) by a sleeve (40), one end of which is fixed on the drive mounting plate (3).

5. The automatic thread cutting, presser foot lifting, and tooth lowering device according to claim 1, characterized in that: The presser foot lifting mechanism includes a presser foot lever (21), a presser foot crank (22), and a presser foot roller (23) that contacts the outer cam surface of the presser foot cam (6). The presser foot roller (23) is located at one end of the presser foot lever (21). One end of the presser foot lever (21) extends to one side of the presser foot cam (6), and the other end rotates around the axis of the presser foot shaft (24). The presser foot crank (22) is fixed on the presser foot shaft (24). The other end of the presser foot crank (22) abuts against the other end of the presser foot lever (21) to drive the presser foot shaft (24) to rotate in one direction. The presser foot shaft (24) is connected to the presser foot (12) through the presser foot arm (25).

6. The automatic thread cutting, presser foot lifting, and tooth lowering device according to claim 1, characterized in that: The wire cutting mechanism includes a first drive lever (26) and a second drive lever (27) rotatably mounted on the housing (4). The first drive lever (26) is in contact with the outer cam surface of the wire cutting cam (7). One end of the second drive lever (27) is located below the first drive lever (26), and the other end is connected to one end of the wire cutting shaft (30) through the first connecting rod (28) and the first crank (29). The other end of the wire cutting shaft (30) is provided with a moving blade (31).

7. The automatic thread cutting, presser foot lifting, and tooth lowering device according to claim 6, characterized in that: One end of the second drive lever (27) is provided with a ball head (32), and the bottom surface of the first drive lever (26) has an arc-shaped surface, with the ball head (32) located below the arc-shaped surface.

8. The automatic thread cutting, presser foot lifting, and tooth lowering device according to claim 1, characterized in that: The tooth lowering mechanism includes a tooth adjusting lever (33) set on the drive component mounting plate (3). One end of the tooth adjusting lever (33) is rotatably connected to the drive component mounting plate (3), and the other end is connected to the tooth adjusting eccentric shaft (36) through the second connecting rod (34) and the second crank (35). The tooth adjusting eccentric shaft (36) is connected to the slide groove (38) at one end of the feeding tooth frame and the differential tooth frame through the slider (37). The other end of the feeding tooth frame and the differential tooth frame are respectively provided with a feeding tooth and a differential tooth.

9. A sewing machine, characterized in that: Includes an automatic wire cutting, presser foot lifting, and tooth lowering device as described in any one of claims 1-8.

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