Feeding tooth adjusting mechanism and sewing equipment

Abstract

The utility model provides a feed dog adjusting mechanism and sewing equipment, which comprises a feed lifting shaft, a feed lifting fork-shaped crank, a feed dog frame and a feed dog, the feed dog is arranged on the feed dog frame, one end of the feed dog frame is provided with a sliding block, and the sliding block is in sliding connection with a fork groove of the feed lifting fork-shaped crank; one end of the tooth frame is connected with the sliding block through an eccentric pin, the eccentric pin comprises an eccentric part and a concentric part, and the eccentric part and the concentric part are eccentrically connected; the eccentric part is hinged to one end of the tooth frame, and the concentric part penetrates through the sliding block and is hinged to the sliding block; a ratchet adjusting wrench and a locking block are further arranged on the concentric part, and the ratchet adjusting wrench is arranged between the locking block and the sliding block; the locking block is arranged on the concentric part in a sleeving mode, and the locking block and the eccentric pin synchronously move in the circumferential direction. The mode of adjusting the height of the feeding tooth is simple and rapid, a lathe worker can rapidly adjust the height of the feeding tooth, the operation of waiting for maintenance personnel in the prior art is not needed, and the working efficiency can be effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of feed dog height adjustment equipment in clothing production equipment, in particular to a feed dog adjustment mechanism and sewing equipment. Background Art

[0002] In the sewing industry, the flat-bed sewing machine realizes the movement of the fabric on the upper surface of the needle plate through the movement of the feed tooth rack. The teeth of the feed tooth rack are exposed from the upper surface of the needle plate and pressed against the lower surface of the fabric. The feed tooth rack moves to push the fabric along the upper surface of the needle plate. The height of the feed teeth exposed from the upper surface of the needle plate can adapt to different sewing conditions; when users sew fabrics of different thicknesses and materials, they often need to adjust the angle of the lifting fork, that is, adjust the height of the feed teeth. Flat-bed sewing machines are mainly divided into thin-material and thick-material models. One of the main differences between thick-material and thin-material models is that the height of the feed tooth rack teeth exposed from the needle plate is different. The height of the feed tooth rack teeth above the needle plate surface of the thick-material model is higher than that of the thin-material model. For the thick-material model, the feed tooth rack is pressed more deeply on the fabric, which can provide stronger feeding capabilities.

[0003] In the field of sewing machines, the market demand for clothes is diversified, showing a trend of small single quick response and diversified sewing materials, which causes users to change styles frequently. Changing styles usually means changes in clothing fabrics, causing users to adjust the sewing machine to adapt to the sewing of new fabrics. Among them, due to changes in the thickness of the fabric, users usually need to adjust the height of the sewing machine feed teeth to adapt to sewing. However, the height adjustment of the sewing machine feed teeth can only be achieved by turning over the machine head and loosening the screws of the tooth-lifting fork crank with great force to adjust the upper and lower positions of the tooth-lifting fork crank to roughly adjust the height of the feed teeth. These are basically no big problems for the mechanics in the garment factory, but the number of mechanics in the garment factory is limited, and it is impossible to handle the adjustment in time. In addition, the sewing workers are mainly women, and their strength is relatively small. It is very difficult to turn over the sewing machine head and loosen the screws. At the same time, sewing workers rarely have handy tools to loosen the screws. In addition, there is no clear concept of how much the tooth height can be adjusted, so it is necessary to adjust the height of the feed teeth to adapt to sewing after changing the sewing style, but because the adjustment process is cumbersome, they can only wait for the mechanic to operate, affecting the operating efficiency of the garment factory.

[0004] In view of the above problems, it is necessary to provide a feed dog adjustment mechanism and a sewing device, which can realize convenient and simple adjustment of the feed dog height. Utility Model Content

[0005] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the utility model is to provide a feed dog adjustment mechanism and a sewing device for quickly and conveniently adjusting the height of the feed dog, thereby solving the problem in the prior art that the feed dog height adjustment operation is cumbersome, requires operation by professional machine repair personnel, and has low work efficiency.

[0006] To achieve the above-mentioned purpose, the utility model provides a feeding tooth adjustment mechanism, including a tooth lifting shaft, a tooth lifting fork crank, a tooth rack, and a feeding tooth, wherein the feeding tooth is arranged on the tooth rack, and a sliding block is arranged at one end of the tooth rack, and the sliding block is slidably connected to the fork groove of the tooth lifting fork crank; one end of the tooth rack and the sliding block are connected by an eccentric pin, and the eccentric pin includes an eccentric part and a concentric part, and the eccentric part and the concentric part are eccentrically connected; the eccentric part is hinged to one end of the tooth rack, and the concentric part passes through the sliding block and is hinged to the sliding block; a ratchet adjustment wrench and a locking block are also arranged on the concentric part, and the ratchet adjustment wrench is arranged between the locking block and the sliding block; the locking block is sleeved on the concentric part and moves synchronously with the eccentric pin in the circumferential direction; the ratchet adjustment wrench is slidably connected to the locking block, and an elastic member is also arranged between the ratchet adjustment wrench and the locking block; a first ratchet is arranged on the ratchet adjustment wrench, and a second ratchet is arranged at the end of the sliding block, and the first ratchet can mesh with the second ratchet.

[0007] Preferably, the locking block is provided with a locking block through hole axially therethrough, and the locking block is sleeved on the concentric part through the locking block through hole; the locking block is provided with a locking block positioning hole radially therethrough, and the locking block positioning hole is connected with the locking block through hole, and a positioning screw is arranged in the locking block positioning hole.

[0008] Preferably, the ratchet adjustment wrench includes a wrench body, an end stopper, and an end arc block, the end stopper and the end arc block are arranged at both ends of the wrench body, the wrench body is axially provided with a wrench guide groove, the wrench guide groove is used to cooperate with the locking block so that the ratchet adjustment wrench is slidably connected with the locking block; the first ratchet is arranged on the end face of the end arc block close to the end stopper; the elastic member is arranged between the end stopper and the locking block.

[0009] Preferably, the wrench body, the end stopper and the end arc block are an integrated piece, and the three form a "Z" shape.

[0010] Preferably, a locking block guide portion is provided on the end surface of the locking block close to the ratchet adjustment wrench, and the locking block guide portion is clamped in the wrench guide groove; the ratchet adjustment wrench slides along the locking block guide portion through the wrench guide groove.

[0011] Preferably, a mounting groove is provided on the end stopper, one end of the elastic member is arranged in the mounting groove, and the other end of the elastic member is in contact with the locking block.

[0012] Preferably, the elastic member is a spring.

[0013] Preferably, the slider is provided with a slider through hole axially extending therethrough, and the slider is sleeved on the concentric portion of the eccentric pin through the slider through the slider through hole; a blocking ring is provided on the end face of the slider close to the ratchet adjustment wrench, and the second ratchet is provided on the blocking ring.

[0014] Preferably, a tooth frame axial hole is opened on the tooth frame, and the tooth frame axial hole is sleeved on the eccentric part. An eccentric pin stopper is arranged on the outer peripheral surface of one end of the eccentric part away from the concentric part, and the eccentric pin stopper limits the axial movement of the tooth frame on the eccentric pin; a gasket is also arranged between the slider and the tooth frame, and the gasket is sleeved on the concentric part.

[0015] In order to achieve the above-mentioned purpose or other purposes, the utility model also discloses a sewing device, which adopts the above-mentioned feed dog adjustment mechanism and also includes a base plate and a feed shaft, wherein the tooth lifting shaft and the feed shaft are both hinged in the base plate; the tooth lifting fork crank is arranged on the tooth lifting shaft, and a tooth rack seat is arranged on the feed shaft, and the end of the tooth rack away from the tooth lifting shaft is hinged to the tooth rack seat through a tooth rack pin.

[0016] As described above, the feed dog adjustment mechanism and sewing equipment involved in the utility model have the following beneficial effects:

[0017] 1. The feed dog adjustment mechanism and sewing equipment involved in the utility model hinge the eccentric part of the eccentric pin with the tooth frame, and the concentric part of the eccentric pin passes through the slider, the ratchet adjustment wrench, and the locking block, and the locking block and the eccentric pin rotate synchronously in the circumferential direction; in this way, the eccentric pin is driven to rotate by the locking block, and the concentric part of the eccentric pin rotates in the slider, and the slider remains stationary; the eccentric part of the eccentric pin rotates in the tooth frame, thereby realizing the change of the tooth frame height, and since the slider is slidably connected to the fork groove of the tooth lifting fork crank, the relative position of the tooth lifting fork crank and the tooth frame changes, thereby realizing the adjustment of the feed dog height.

[0018] 2. The method of adjusting the height of the feed dog adopted by the utility model is simple and quick. The lathe operator can quickly adjust the height of the feed dog without waiting for the maintenance personnel to operate as in the prior art, which can effectively ensure the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the sewing equipment involved in the utility model;

[0020] Figure 2 It is a spatial schematic diagram of the feed dog adjustment mechanism involved in the utility model;

[0021] Figure 3 It is an exploded view of the feed dog adjustment mechanism involved in the utility model;

[0022] Figure 4 It is a spatial schematic diagram of the locking block of the feed dog adjustment mechanism involved in the utility model;

[0023] Figure 5 It is a spatial schematic diagram of a slider of a feed dog adjustment mechanism involved in the utility model;

[0024] Figure 6 It is a spatial schematic diagram of a ratchet adjustment wrench of a feed dog adjustment mechanism involved in the utility model;

[0025] Figure 7 The utility model is a working schematic diagram of the feed dog adjustment mechanism.

[0026] Description of reference numerals:

[0027] 1. Base plate; 2. Tooth lifting shaft; 3. Tooth lifting fork crank; 4. Tooth rack; 401. Tooth rack shaft hole; 5. Feed tooth; 6. Tooth rack pin; 7. Tooth rack seat; 8. Feed shaft; 9. Elastic member; 10. Eccentric pin; 1001. Concentric part; 1002. Eccentric part; 1003. Eccentric pin stopper; 11. Gasket; 12. Slider; 1201. Second ratchet; 1202. Stop ring; 1203. Slider through hole; 13. Ratchet adjustment wrench; 1301. First ratchet; 1302. End arc block; 1303. Wrench body; 1304. Wrench guide groove; 1305. End stopper; 1306. Mounting groove; 14. Locking block; 1401. Locking block guide; 1402. Locking block positioning hole; 1403. Locking block through hole; 15. Positioning screw. DETAILED DESCRIPTION

[0028] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0029] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0030] The utility model provides a feeding tooth adjustment mechanism. For the convenience of description, the extending direction of the eccentric pin 10 is defined as the left-right direction, and the extending direction of the tooth frame 4 is the front-back direction. Figure 7 As shown, the left direction and the right direction of the paper are the rear direction and the front direction respectively, the front side and the back side of the paper are the left direction and the right direction respectively, and the upper direction and the lower direction of the paper are the upper direction and the lower direction respectively.

[0031] like Figure 1-Figure 7 As shown, the utility model provides a feeding tooth adjustment mechanism, including a tooth lifting shaft 2, a tooth lifting fork crank 3, a tooth frame 4, and a feeding tooth 5, the feeding tooth 5 is fixedly arranged on the tooth frame 4, a slider 12 is arranged at the left end of the tooth frame 4, and the slider 12 is slidably connected with the fork groove of the tooth lifting fork crank 3; the front end of the tooth frame 4 is connected to the slider 12 through an eccentric pin 10, the eccentric pin 10 includes an eccentric portion 1002 and a concentric portion 1001, and the eccentric portion 1002 and the concentric portion 1001 are eccentrically connected; the eccentric portion 1002 is hinged to the front end of the tooth frame 4, and the concentric portion 1001 passes through the slider 12 and is hinged with the slider 12 The concentric portion 1001 is also provided with a ratchet adjustment wrench 13 and a locking block 14, and the ratchet adjustment wrench 13 is arranged between the locking block 14 and the slider 12; the locking block 14 is sleeved on the concentric portion 1001 and moves synchronously with the eccentric pin 10 in the circumferential direction; the ratchet adjustment wrench 13 and the locking block 14 are radially slidably connected, and an elastic member 9 is further provided between the ratchet adjustment wrench 13 and the locking block 14; the front end of the ratchet adjustment wrench 13 is provided with a first ratchet 1301, and the front end of the slider 12 is provided with a second ratchet 1201, and the first ratchet 1301 can mesh with the second ratchet 1201.

[0032] The utility model is provided with a locking block 14, which drives the eccentric pin 10 to rotate through the locking block 14, thereby realizing the rotation of the eccentric part 1002 of the eccentric pin 10, and the rotation of the eccentric part 1002 realizes the change of the height of the tooth frame 4; when the height adjustment of the tooth frame 4 is completed, the ratchet adjustment wrench 13 is slid along the locking block 14 to make the first ratchet 1301 and the second ratchet 1201 mesh, so that the ratchet adjustment wrench 13 and the slider 12 are locked, and because the ratchet adjustment wrench 13 and the locking block 14 are only radially slidingly connected, the locking block 14 is relatively fixed to the slider 12 through the ratchet adjustment wrench 13, thereby avoiding the change of the height of the tooth frame 4 caused by the rotation of the locking block 14 during sewing.

[0033] Preferably, Figure 3 , Figure 4As shown, the locking block 14 is provided with a locking block through hole 1403 extending from left to right along the axial direction, and the locking block 14 is sleeved on the concentric portion 1001 through the locking block through hole 1403; the locking block 14 is provided with a locking block positioning hole 1402 extending from left to right along the radial direction, and the locking block positioning hole 1402 is communicated with the locking block through hole 1403, and a positioning screw 15 is provided in the locking block positioning hole 1402. In this embodiment, the locking block positioning hole 1402 is a threaded hole, and the positioning screw 15 is threadedly connected in the locking block positioning hole 1402, and the positioning screw 15 fastens the locking block 14 and the eccentric pin 10. The locking block through hole 1403 is provided at the center of the locking block 14.

[0034] Preferably, Figure 3 , Figure 6 As shown, the ratchet adjustment wrench 13 includes a wrench body 1303, an end block 1305, and an end arc block 1302, wherein the end block 1305 is arranged at the rear end of the wrench body 1303, and the end arc block 1302 is arranged at the front end of the wrench body 1303. The wrench body 1303 is axially penetrated by a wrench guide groove 1304, and the wrench guide groove 1304 is used to cooperate with the locking block 14 so that the ratchet adjustment wrench 13 is slidably connected with the locking block 14; the first ratchet 1301 is arranged on the rear end face of the end arc block 1302; and the elastic member 9 is arranged between the end block 1305 and the locking block 14. In this embodiment, the wrench guide groove 1304 extends in the front-to-back direction to ensure that the ratchet adjustment wrench 13 moves forward and backward along the locking block 14.

[0035] Preferably, Figure 3 , Figure 6 As shown, the spanner body 1303, the end block 1305, and the end arc block 1302 are an integral part, and the three form a "Z" shape. In this embodiment, the end block 1305 is arranged at the rear end of the spanner body 1303 and extends in the left direction, and is used to support the locking block 14 arranged on the left side of the ratchet adjustment spanner 13. The end arc block 1302 is arranged at the front end of the spanner body 1303 and extends in the right direction, and is used to engage and lock with the slider 12 arranged on the right side of the ratchet adjustment spanner 13.

[0036] Preferably, Figure 3 , Figure 4 , Figure 6 As shown, a locking block guide portion 1401 is provided on the end surface of the locking block 14 close to the ratchet adjustment wrench 13, and the locking block guide portion 1401 is clamped in the wrench guide groove 1304; the ratchet adjustment wrench 13 slides along the locking block guide portion 1401 through the wrench guide groove 1304. Further, the front end surface of the locking block 14 is an arc surface for the operator to press.

[0037] Preferably, Figure 3 , Figure 6 As shown, a mounting groove 1306 is provided on the front end surface of the end stopper 1305, and the rear end of the elastic member 9 is disposed in the mounting groove 1306, and the front end of the elastic member 9 abuts against the locking block 14. Further, the elastic member 9 is a spring.

[0038] Preferably, Figure 3 , Figure 5 As shown, the slider 12 is provided with a slider through hole 1203 extending from left to right along the axial direction, and the slider 12 is sleeved on the concentric portion 1001 of the eccentric pin 10 through the slider through hole 1203; a blocking ring 1202 is provided on the left end surface of the slider 12, and the second ratchet 1201 is provided at the front end of the blocking ring 1202. In this embodiment, the second ratchet 1201 is provided at the front end of the blocking ring 1202, and the first ratchet 1301 is provided at the rear end of the end arc block 1302, so that when the first ratchet 1301 and the second ratchet 1201 are engaged, the blocking ring 1202 and the end arc block 1302 are relatively fixed, that is, the slider 12 and the ratchet adjustment wrench 13 are relatively fixed.

[0039] Preferably, Figure 3 As shown, a tooth frame 4 is provided with a tooth frame shaft hole 401, and the tooth frame shaft hole 401 is sleeved on the eccentric part 1002. An eccentric pin stopper 1003 is provided on the outer peripheral surface of the right end of the eccentric part 1002, and the eccentric pin stopper 1003 limits the axial movement of the tooth frame 4 on the eccentric pin 10; a gasket 11 is also provided between the slider 12 and the tooth frame 4, and the gasket 11 is sleeved on the concentric part 1001. In this embodiment, the gasket 11 is provided to prevent the right end face of the slider 12 from directly contacting the left end face of the tooth frame 4, and at the same time, the gasket 11 cooperates with the blocking ring 1202 to axially limit the tooth lifting fork crank 3, so as to ensure that the fork groove of the tooth lifting fork crank 3 is always clamped on the outer surface of the slider 12 between the gasket 11 and the blocking ring 1202.

[0040] To achieve the above purpose or other purposes, the utility model also discloses a sewing device, such as Figure 1 As shown, the feed tooth adjustment mechanism adopts the above-mentioned feed tooth adjustment mechanism, further comprising a base plate 1 and a feed shaft 8, the feed shaft 2 and the feed shaft 8 are both hinged in the base plate 1; the feed tooth fork crank 3 is arranged on the feed tooth shaft 2, a tooth frame seat 7 is arranged on the feed shaft 8, and the rear end of the tooth frame 4 is hinged to the tooth frame seat 7 through a tooth frame pin 6. In this embodiment, the axial movement of the feed shaft 2 and the feed shaft 8 is restricted by the base plate 1, but the circumferential rotation movement is not restricted.

[0041] The working principle of the feed dog adjustment mechanism and sewing equipment involved in the utility model is as follows:

[0042] First, the operator follows the Figure 1-Figure 7, and the above descriptions are used to assemble the various parts, wherein the slider 12 is slidably hinged with the tooth lifting fork crank 3, and the operator sequentially passes the eccentric pin 10 through the tooth frame shaft hole 401, the gasket 11, the slider 12, the ratchet adjustment wrench 13, and the locking block 14 from right to left. The eccentric portion 1002 of the eccentric pin 10 is hinged with the tooth frame 4 through the tooth frame shaft hole 401; the concentric portion 1001 of the eccentric pin 10 is hinged with the slider 12 through the slider through hole 1203; the concentric portion 1001 of the eccentric pin 10 passes through the wrench guide groove 1304; the concentric portion 1001 of the eccentric pin 10 passes through the locking block through hole 1403. The operator adjusts the axial positions of the locking block 14, the ratchet adjustment wrench 13, the slider 12 and the gasket 11 on the eccentric pin 10 so that the above components are close to each other, and then screws the positioning screw 15 into the locking block positioning hole 1402 to fasten the eccentric pin 10 and the locking block 14, thereby limiting the axial movement of the above components on the eccentric pin 10; then the locking block guide portion 1401 is clamped in the wrench guide groove 1304, and the first ratchet 1301 and the second ratchet 1201 are meshed and connected. At this time, the elastic member 16 also applies a backward force to the ratchet adjustment wrench 13 to prevent the first ratchet 1301 and the second ratchet 1201 from disengaging.

[0043] Then, the slider 12 is slidably hinged with the tooth lifting fork crank 3, the tooth lifting fork crank 3 is set on the tooth lifting shaft 2, and the rear end of the tooth frame 4 is hinged with the feeding shaft 8 through the tooth frame seat 7 and the tooth frame pin 6. When the feeding shaft 8 and the tooth lifting shaft 2 move, the feeding shaft 8 drives the tooth frame 4 to move forward and backward through the tooth frame seat 7 and the tooth frame pin 6, and the tooth lifting shaft 2 drives the tooth frame 4 to move up and down through the tooth lifting fork crank 3, the slider 12, and the eccentric pin 10, and the feeding tooth 5 fixed on the tooth frame 4 moves up and down and forward in an elliptical motion to realize the feeding of the sewing material.

[0044] When the height of the feed dog 5 needs to be adjusted, Figure 7As shown, the operator presses the rear end of the end stopper 1305 and the front end of the locking block 14 at the same time. Since the locking block 14 is fastened to the eccentric pin 10 by the positioning screw 15 and the locking block guide 1401 is slidably clamped in the wrench guide slot 1304, the ratchet adjustment wrench 13 will slide forward along the locking block guide 1401, and the first ratchet 1301 on the end arc block 1302 will move forward, thereby disengaging from the second ratchet 1201 on the slider 12, and the elastic member 9 is compressed at this time. The operator rotates the ratchet adjustment wrench 13 in the circumferential direction, and the ratchet adjustment wrench 13 drives the locking block 14 to rotate in the circumferential direction through the wrench guide slot 1304 and the locking block guide 1401. In this way, the locking block 14 drives the eccentric pin 10 to rotate, and the relative position of the eccentric portion 1002 of the eccentric pin 10 and the tooth frame 4 changes. Since the concentric portion 1001 of the eccentric pin 10 is hinged to the slider 12, and the slider 12 is slidably connected to the tooth-lifting fork crank 3, the position of the tooth rack 4 relative to the tooth-lifting fork crank 3 changes, thereby achieving an up and down change in the position of the feed tooth 5 installed on the tooth rack 4.

[0045] When the height of the feed tooth 5 is adjusted to the corresponding position, the operator aligns the first ratchet 1301 and the second ratchet 1201 in the front-to-back direction, and then releases the rear end of the pressed end stop block 1305 and the front end of the locking block 14, and the elastic force in the elastic member 9 is released, thereby pushing the ratchet adjustment wrench 13 to move toward the rear end along the locking block guide portion 1401, so that the first ratchet 1301 and the second ratchet 1201 are meshed, and the slider 12, the ratchet adjustment wrench 13, and the locking block 14 are relatively fixed, so as to avoid the rotation of the ratchet adjustment wrench 13 and the locking block 14 during the feeding process, which drives the eccentric pin 10 and the slider 12 to have relative displacement, resulting in a change in the height of the feed tooth 5.

[0046] The feed dog adjustment mechanism and sewing equipment involved in the utility model can adjust the height of the feed dog 5 simply and quickly, without waiting for the mechanic to operate as in the prior art, and the lathe operator can also adjust it by himself, which can effectively ensure the working efficiency.

[0047] In summary, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A feed dog adjustment mechanism, characterized in that: It comprises a tooth-lifting shaft (2), a tooth-lifting fork crank (3), a tooth frame (4), and a feed tooth (5), wherein the feed tooth (5) is arranged on the tooth frame (4), and a slider (12) is arranged at one end of the tooth frame (4), and the slider (12) is slidably connected to the fork groove of the tooth-lifting fork crank (3); one end of the tooth frame (4) is connected to the slider (12) via an eccentric pin (10), and the eccentric pin (10) comprises an eccentric portion (1002) and a concentric portion (1001), and the eccentric portion (1002) and the concentric portion (1001) are eccentrically connected; the eccentric portion (1002) is hinged to one end of the tooth frame (4), and the concentric portion (1001) passes through the slider (12) and is hinged to the slider (12); The concentric portion (1001) is also provided with a ratchet adjustment wrench (13) and a locking block (14), wherein the ratchet adjustment wrench (13) is arranged between the locking block (14) and the slider (12); the locking block (14) is sleeved on the concentric portion (1001) and moves synchronously with the eccentric pin (10) in the circumferential direction; the ratchet adjustment wrench (13) is slidably connected to the locking block (14), and an elastic member (9) is further provided between the ratchet adjustment wrench (13) and the locking block (14); the ratchet adjustment wrench (13) is provided with a first ratchet (1301), and the end of the slider (12) is provided with a second ratchet (1201), and the first ratchet (1301) can mesh with the second ratchet (1201).

2. The feed dog adjustment mechanism according to claim 1, characterized in that: The locking block (14) is provided with a locking block through hole (1403) extending axially therethrough, and the locking block (14) is sleeved on the concentric portion (1001) through the locking block through hole (1403); the locking block (14) is provided with a locking block positioning hole (1402) radially therethrough, and the locking block positioning hole (1402) is communicated with the locking block through hole (1403), and a positioning screw (15) is arranged in the locking block positioning hole (1402).

3. The feed dog adjustment mechanism according to claim 1, characterized in that: The ratchet adjustment wrench (13) comprises a wrench body (1303), an end block (1305), and an end arc block (1302); the end block (1305) and the end arc block (1302) are arranged at two ends of the wrench body (1303); the wrench body (1303) is provided with a wrench guide groove (1304) along the axial direction; the wrench guide groove (1304) is used to cooperate with the locking block (14) so ​​that the ratchet adjustment wrench (13) and the locking block (14) are slidably connected; the first ratchet (1301) is provided on the end surface of the end arc block (1302) close to the end block (1305); and the elastic member (9) is arranged between the end block (1305) and the locking block (14).

4. The feed dog adjustment mechanism according to claim 3, characterized in that: The wrench body (1303), the end stopper (1305) and the end arc block (1302) are an integral part, and the three form a "Z" shape.

5. The feed dog adjustment mechanism according to claim 3, characterized in that: A locking block guide portion (1401) is provided on the end surface of the locking block (14) close to the ratchet adjustment wrench (13), and the locking block guide portion (1401) is clamped in the wrench guide groove (1304); the ratchet adjustment wrench (13) slides along the locking block guide portion (1401) through the wrench guide groove (1304).

6. The feed dog adjustment mechanism according to claim 3, characterized in that: The end stopper (1305) is provided with a mounting groove (1306), one end of the elastic member (9) is arranged in the mounting groove (1306), and the other end of the elastic member (9) is in contact with the locking block (14).

7. The feed dog adjustment mechanism according to claim 6, characterized in that: The elastic member (9) is a spring.

8. The feed dog adjustment mechanism according to claim 1, characterized in that: The slider (12) is provided with a slider through hole (1203) extending through the slider in the axial direction, and the slider (12) is sleeved on the concentric portion (1001) of the eccentric pin (10) through the slider through hole (1203); a blocking ring (1202) is provided on the end surface of the slider (12) close to the ratchet adjustment wrench (13), and the second ratchet (1201) is provided on the blocking ring (1202).

9. The feed dog adjustment mechanism according to claim 1, characterized in that: The tooth frame (4) is provided with a tooth frame axial hole (401), the tooth frame axial hole (401) is sleeved on the eccentric portion (1002), an eccentric pin stopper (1003) is provided on the outer peripheral surface of one end of the eccentric portion (1002) away from the concentric portion (1001), and the eccentric pin stopper (1003) limits the axial movement of the tooth frame (4) on the eccentric pin (10); a gasket (11) is also provided between the slider (12) and the tooth frame (4), and the gasket (11) is sleeved on the concentric portion (1001).

10. A sewing device, using the feed dog adjustment mechanism according to any one of claims 1 to 9, characterized in that: It also comprises a base plate (1) and a feed shaft (8), wherein the tooth-lifting shaft (2) and the feed shaft (8) are both hinged in the base plate (1); the tooth-lifting fork crank (3) is arranged on the tooth-lifting shaft (2), a tooth frame seat (7) is arranged on the feed shaft (8), and the end of the tooth frame (4) away from the tooth-lifting shaft (2) is hinged to the tooth frame seat (7) via a tooth frame pin (6).

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