Feeding tooth height adjusting mechanism and sewing equipment

Abstract

The utility model provides a feed dog height 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; an adjusting crank is further arranged on the concentric part, and the adjusting crank and the eccentric pin synchronously move in the circumferential direction. The adjusting crank and the locking stud are adopted, the adjusting groove is formed in the adjusting crank, an operator can rotate the eccentric pin at any angle within the limiting range of the adjusting groove, and therefore stepless adjustment of the height of the feeding tooth is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of a feed dog height adjustment mechanism in a sewing device, in particular to a feed dog height adjustment mechanism and a sewing device. 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, as the market demand for clothes becomes diversified, there is 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, which affects the operating efficiency of the garment factory.

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

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a feed dog height adjustment mechanism and a sewing device, which are used to solve the problem that the feed dog height adjustment operation in the prior art is cumbersome, requires professional machine repair personnel to operate, and has low work efficiency.

[0006] To achieve the above-mentioned purpose, the utility model provides a feed dog height adjustment mechanism, including a tooth lifting shaft, a tooth lifting fork crank, a tooth rack, and a feed dog, the feed dog being arranged on the tooth rack, a slider being arranged at one end of the tooth rack, and the slider being slidably connected to the fork groove of the tooth lifting fork crank; one end of the tooth rack and the slider are connected by an eccentric pin; the eccentric pin includes an eccentric portion and a concentric portion, and the eccentric portion and the concentric portion are eccentrically connected; the eccentric portion is hinged to one end of the tooth rack, and the concentric portion passes through the slider and is hinged to the slider; an adjusting crank is also arranged on the concentric portion, and the adjusting crank and the eccentric pin move synchronously in the circumferential direction; an adjusting groove is provided on the adjusting crank, and a slider connecting hole is provided on the slider, the adjusting groove is aligned with the slider connecting hole and a locking stud is passed through the two; the adjusting crank is detachably connected to the slider through the adjusting groove, the slider connecting hole and the locking stud.

[0007] Preferably, the concentric portion includes a concentric portion hinge area and a concentric portion clamping area, the concentric portion hinge area is connected to the eccentric portion; the slider is arranged in the concentric portion hinge area, the concentric portion clamping area is provided with a step extending axially, and the cross-sectional shape of the concentric portion clamping area along the radial direction is an arc shape; the adjusting crank is arranged in the concentric portion clamping area.

[0008] Preferably, the adjusting crank is provided with a crank through hole in the axial direction, the radial cross-sectional shape of the crank through hole matches the radial cross-sectional shape of the concentric clamping area, and the adjusting crank is fixedly sleeved in the concentric clamping area through the crank through hole.

[0009] Preferably, screw threads are provided on the outer peripheral surface of the concentric clamping area, and an anti-loosening nut is provided at the end of the concentric clamping area away from the concentric hinge area. The anti-loosening nut is fastened to the concentric clamping area through screw threads to make the adjusting crank close to the slider.

[0010] Preferably, a blocking ring is provided on the outer peripheral surface of one end of the eccentric portion away from the concentric portion, and a connecting groove for connecting to a flat screwdriver is provided on the end surface of one end of the eccentric portion away from the concentric portion.

[0011] Preferably, a tooth frame shaft hole is opened on the tooth frame, and the tooth frame shaft hole is sleeved on the eccentric part; a gasket is also provided between the slider and the tooth frame, and the gasket is sleeved on the hinge area of ​​the concentric part.

[0012] Preferably, an extension plate is further provided on the end surface of the slider close to the adjusting crank, and the slider connecting hole is axially opened on the extension plate.

[0013] Preferably, the slider connection hole is a threaded hole, and the locking stud is connected to the slider connection hole by threads.

[0014] In order to achieve the above-mentioned purpose or other purposes, the utility model also discloses a sewing device, including the above-mentioned feed dog height adjustment mechanism, and also including 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.

[0015] As described above, the feed dog height adjustment mechanism and sewing equipment involved in the utility model have the following beneficial effects:

[0016] 1. The feed tooth height adjustment mechanism and sewing equipment involved in the utility model hinge the eccentric part of the eccentric pin with the tooth frame, divide the concentric part of the eccentric pin into a concentric part hinge area and a concentric part clamping area, the slider is sleeved on the concentric part hinge area, the adjusting crank is arranged in the concentric part clamping area, and the adjusting crank and the concentric part clamping area rotate synchronously in the circumferential direction; in this way, the eccentric pin is driven to rotate by the adjusting crank, the concentric part hinge area 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; because 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 tooth height.

[0017] 2. The utility model adopts an adjusting crank and a locking stud. An adjusting slot is provided on the adjusting crank. The operator can rotate the eccentric pin at any angle within the limit range of the adjusting slot, thereby realizing stepless adjustment of the height of the feed dog.

[0018] 3. The utility model has a simple method for adjusting the height of the feed dog, and 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, thereby ensuring the operating efficiency of the garment factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of the feed dog height adjustment mechanism of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the feed dog height adjustment mechanism of the utility model;

[0021] Figure 3 It is a connection schematic diagram of the feed dog height adjustment mechanism of the utility model.

[0022] Description of reference numerals:

[0023] 1. eccentric pin; 101. concentric part; 1011. concentric part clamping area; 1012. concentric part hinge area; 1013. step; 102. eccentric part; 103. blocking ring; 104. connecting groove;

[0024] 2. Slider; 201. Extension plate; 202. Slider connection hole; 203. Slider through hole;

[0025] 3. Adjusting crank; 301. Adjusting slot; 302. Crank through hole;

[0026] 4. Locking stud; 5. Anti-loosening nut; 6. Washer; 7. Tooth rack; 8. Feeding tooth; 9. Tooth rack seat; 10. Tooth rack pin; 11. Feeding shaft; 12. Tooth lifting shaft; 13. Tooth lifting fork crank. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] The utility model provides a feeding dog height adjustment mechanism. For the convenience of description, the extending direction of the eccentric pin 1 is defined as the left-right direction, and the extending direction of the tooth frame 7 is defined as the front-back direction. Figure 1 As shown, the front end of the tooth frame 7 is connected to the eccentric pin 1 , the eccentric portion 102 is located at the right end of the eccentric pin 1 , and the concentric portion 101 is located at the left end of the eccentric pin 1 .

[0030] like Figure 1-Figure 3As shown, the utility model provides a feed tooth height adjustment mechanism, including a tooth lifting shaft 12, a tooth lifting fork crank 13, a tooth frame 7, and a feed tooth 8, the feed tooth 8 is fixedly arranged on the tooth frame 7, a slider 2 is arranged at the left end of the tooth frame 7, and the slider 2 is slidably connected with the fork groove of the tooth lifting fork crank 13; the front end of the tooth frame 7 is connected to the slider 2 through an eccentric pin 1; the eccentric pin 1 includes an eccentric portion 102 and a concentric portion 101, and the eccentric portion 102 and the concentric portion 101 are eccentrically connected; the eccentric portion 102 is connected to the front end of the tooth frame 7 Hinge, the concentric portion 101 passes through the slider 2 and is hinged with the slider 2; an adjusting crank 3 is also provided on the concentric portion 101, and the adjusting crank 3 and the eccentric pin 1 move synchronously in the circumferential direction; an adjusting groove 301 is opened on the adjusting crank 3 in the left-right direction, and a slider connecting hole 202 is opened on the slider 2 in the left-right direction, the adjusting groove 301 is aligned with the slider connecting hole 202 and a locking stud 4 is passed through the two; the adjusting crank 3 is detachably connected to the slider 2 through the adjusting groove 301, the slider connecting hole 202 and the locking stud 4.

[0031] The utility model is provided with an adjusting crank 3, which drives the eccentric pin 1 to rotate by the adjusting crank 3, thereby realizing the rotation of the eccentric portion 102 of the eccentric pin 1, and the rotation of the eccentric portion 102 realizes the change of the height of the tooth frame 7; when the height adjustment of the tooth frame 7 is completed, the adjusting crank 3 is locked with the slider 2 by the locking stud 4, thereby avoiding the change of the height of the tooth frame 7 caused by the rotation of the adjusting crank 3 during the sewing process. An adjusting slot 301 is provided on the adjusting crank 3, and the operator can arbitrarily adjust the rotation angle of the eccentric pin 1 within the limit range of the adjusting slot 301, thereby realizing stepless adjustment of the height of the tooth frame 7.

[0032] Preferably, Figure 1 As shown, the concentric portion 101 includes a concentric portion hinge area 1012 and a concentric portion clamping area 1011, and the concentric portion hinge area 1012 is connected to the eccentric portion 102; the slider 2 is arranged in the concentric portion hinge area 1012, and a step 1013 is provided on the concentric portion clamping area 1011 along the axial extension, and the cross-sectional shape of the concentric portion clamping area 1011 along the radial direction is an arc shape; the adjusting crank 3 is arranged in the concentric portion clamping area 1011.

[0033] In this embodiment, if Figure 1 As shown, the concentric hinge area 1012 is arranged at the right end of the concentric part 101, the concentric clamping area 1011 is arranged at the left end of the concentric part 101, and the step 1013 is radially opened in the concentric clamping area 1011. Further, a slider through hole 203 is opened at the center of the slider 2, and the slider 2 is sleeved on the outer peripheral surface of the concentric hinge area 1012 through the slider through hole 203, so as to realize the rotation of the eccentric pin 1 in the slider through hole 203.

[0034] Preferably, Figure 1As shown, the adjusting crank 3 is provided with a crank through hole 302 in the axial direction, and the cross-sectional shape of the crank through hole 302 in the radial direction matches the cross-sectional shape of the concentric clamping area 1011 in the radial direction, and the adjusting crank 3 is fixedly sleeved in the concentric clamping area 1011 through the crank through hole 302. In this embodiment, the cross-sectional shape of the crank through hole 302 in the radial direction is a superior arc shape, and the crank through hole 302 is sleeved in the concentric clamping area 1011, and the top surface of the crank through hole 302 abuts against the step 1013, so when the adjusting crank 3 rotates, the adjusting crank 3 will drive the eccentric pin 1 to rotate through the step 1013, thereby realizing the change of the height of the tooth frame 7.

[0035] Preferably, Figure 1-Figure 2 As shown, a screw thread is provided on the outer circumference of the concentric clamping area 1011, and a locking nut 5 is provided at the left end of the concentric clamping area 1011. The locking nut 5 is fastened to the left end of the concentric clamping area 1011 through the screw thread, so that the adjusting crank 3 is close to the slider 2. The right end of the locking nut 5 abuts against the left end of the adjusting crank 3 to limit the movement of the adjusting crank 3 in the axial direction.

[0036] Preferably, Figure 1 As shown, a blocking ring 103 is provided on the outer peripheral surface of the right end of the eccentric part 102, and a connecting groove 104 for connecting with a "slotted screwdriver" is provided on the right end surface of the eccentric part 102. In this embodiment, the diameter of the blocking ring 103 is larger than the diameter of the tooth frame axial hole; the purpose of setting the blocking ring 103 is to limit the axial movement of the tooth frame 7 on the eccentric pin 1, and the purpose of setting the connecting groove 104 is to facilitate the operator to use the "slotted screwdriver" to penetrate the eccentric pin 1 from right to left through the tooth frame 7, and make the blocking ring 103 abut against the end face of the tooth frame 7, and then screw the anti-loosening nut 5 from left to right onto the thread of the concentric part clamping area 1011. The blocking ring 103 and the anti-loosening nut 5 cooperate to limit the axial movement of the adjusting crank 3, the slider 2, and the tooth frame 7 on the eccentric pin 1.

[0037] Preferably, in this embodiment, a tooth frame axial hole is opened at the front end of the tooth frame 7, and the tooth frame axial hole is sleeved on the eccentric part 102; a gasket 6 is also provided between the slider 2 and the tooth frame 7, and the gasket 6 is sleeved on the concentric part hinge area 1012.

[0038] Preferably, Figure 1 As shown, an extension plate 201 is further provided on the left end surface of the slider 2 near the adjusting crank 3, and a slider connection hole 202 is axially opened on the extension plate 201. Further, the slider connection hole 202 is a threaded hole, and the locking stud 4 is connected to the slider connection hole 202 by threading.

[0039] In this embodiment, if Figure 1 , Figure 3As shown, the eccentric pin 1 passes through the tooth frame shaft hole, gasket 6, slider 2, adjusting crank 3, and anti-loosening nut 5 from right to left in sequence. The gasket 6 is provided to prevent the right end face of the slider 2 from directly contacting the left end face of the tooth frame 7. At the same time, the gasket 6 cooperates with the extension plate 201 to axially limit the tooth lifting fork crank 13, ensuring that the fork groove of the tooth lifting fork crank 13 is always clamped on the outer surface of the slider 2 between the gasket 6 and the extension plate 201.

[0040] To achieve the above purpose or other purposes, the utility model also discloses a sewing device, such as Figure 3 As shown, it includes the above-mentioned feed tooth height adjustment mechanism, and also includes a base plate, and a feed shaft 11. The tooth lifting shaft 12 and the feed shaft 11 are both hinged in the base plate; the tooth lifting fork crank 13 is arranged on the tooth lifting shaft 12, and a tooth rack seat 9 is arranged on the feed shaft 11, and the end of the tooth rack 7 away from the tooth lifting shaft 12 is hinged to the tooth rack seat 9 through the tooth rack pin 10.

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

[0042] First, the operator follows the Figure 1-Figure 3 , and the above descriptions are used to assemble the various parts, wherein the slider 2 is slidably hinged with the tooth lifting fork crank 13, and the operator passes the eccentric pin 1 through the tooth frame shaft hole, the gasket 6, the slider 2, the adjusting crank 3, and the anti-loosening nut 5 from right to left in sequence. The eccentric portion 102 of the eccentric pin 1 is hinged with the tooth frame 7 through the tooth frame shaft hole, the concentric portion hinge area 1012 of the eccentric pin 1 is hinged with the slider 2 through the slider through hole 203, the concentric portion clamping area 1011 of the eccentric pin 1 is fixedly connected with the adjusting crank 3 through the crank through hole 302, and the concentric portion clamping area 1011 of the eccentric pin 1 is fastened with the anti-loosening nut 5 through the screw thread. The operator uses a "one" screwdriver to press into the connection groove 104 of the eccentric pin 1, and uses the blocking ring 103 and the anti-loosening nut 5 at the right end of the eccentric pin 1 to make the adjusting crank 3, the slider 2, the gasket 6, and the tooth frame 7 stick to each other, so as to limit the axial movement of the above-mentioned components on the eccentric pin 1. The locking stud 4 penetrates the adjustment slot 301 and the slider connection hole 202 to achieve relative fixation of the adjustment crank 3 and the slider 2.

[0043] Then, the slider 2 is slidably hinged with the tooth lifting fork crank 13, the tooth lifting fork crank 13 is set on the tooth lifting shaft 12, and the rear end of the tooth frame 7 is hinged with the feeding shaft 11 through the tooth frame seat 9 and the tooth frame pin 10. When the feeding shaft 11 and the tooth lifting shaft 12 move, the feeding shaft 11 drives the tooth frame 7 to move forward and backward through the tooth frame seat 9 and the tooth frame pin 10, and the tooth lifting shaft 12 drives the tooth frame 7 to move up and down through the tooth lifting fork crank 13, the slider 2, and the eccentric pin 1, and the feeding tooth 8 fixed on the tooth frame 7 makes an elliptical motion of moving up and down and forward and backward to realize the feeding of the sewing material.

[0044] When the height of the feed tooth 8 needs to be adjusted, the operator loosens the locking stud 4, and the adjusting crank 3 and the slider 2 change from a relatively fixed state to a separated state; the adjusting crank 3 is rotated with the eccentric pin 1 as a fulcrum, and the adjusting crank 3 drives the eccentric pin 1 to rotate, so that the relative position of the eccentric portion 102 of the eccentric pin 1 and the tooth frame 7 changes. Since the concentric hinge area 1012 of the eccentric pin 1 is hinged with the slider 2, and the slider 2 is slidably connected with the tooth lifting fork crank 13, the position of the tooth frame 7 relative to the tooth lifting fork crank 13 changes, thereby achieving the up and down change of the position of the feed tooth 8 installed on the tooth frame 7. When the height of the feed tooth 8 is adjusted to the corresponding position, tighten the locking stud 4 to restore the adjusting crank 3 and the slider 2 to a relatively fixed state, so as to avoid the relative displacement of the eccentric pin 1 and the slider 2 caused by the adjusting crank 3 during the feeding process, resulting in a change in the height of the feed tooth 8. The rotation range of the eccentric pin 1 is the range between the two inner end surfaces of the adjustment groove 301 and the abutment of the locking stud 4 , that is, the groove length of the adjustment groove 301 .

[0045] The feed dog height adjustment mechanism and sewing equipment involved in the utility model adopt an adjustment crank 3 and a locking stud 4. An adjustment slot 301 is provided on the adjustment crank 3. An operator can rotate the eccentric pin 1 at any angle within the limit range of the adjustment slot 301, thereby realizing stepless adjustment of the height of the feed dog 8.

[0046] In summary, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0047] 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 height adjustment mechanism, characterized in that: It comprises a tooth-lifting shaft (12), a tooth-lifting fork-shaped crank (13), a tooth frame (7), and a feed tooth (8), wherein the feed tooth (8) is arranged on the tooth frame (7), and a slider (2) is arranged at one end of the tooth frame (7), and the slider (2) is slidably connected to the fork groove of the tooth-lifting fork-shaped crank (13); one end of the tooth frame (7) is connected to the slider (2) via an eccentric pin (1); the eccentric pin (1) comprises an eccentric portion (102) and a concentric portion (101), and the eccentric portion (102) and the concentric portion (101) are eccentrically connected; the eccentric portion (102) is hinged to one end of the tooth frame (7), and the concentric portion (101) passes through the slider (2) and is hinged to the slider (2); The concentric portion (101) is also provided with an adjusting crank (3), and the adjusting crank (3) and the eccentric pin (1) move synchronously in the circumferential direction; the adjusting crank (3) is provided with an adjusting groove (301), and the slider (2) is provided with a slider connecting hole (202); the adjusting groove (301) and the slider connecting hole (202) are aligned, and locking studs (4) are passed through the two; the adjusting crank (3) is detachably connected to the slider (2) via the adjusting groove (301), the slider connecting hole (202), and the locking studs (4).

2. The feed dog height adjustment mechanism according to claim 1, characterized in that: The concentric part (101) comprises a concentric part hinge area (1012) and a concentric part clamping area (1011), wherein the concentric part hinge area (1012) is connected to the eccentric part (102); the slider (2) is arranged in the concentric part hinge area (1012), a step (1013) is provided on the concentric part clamping area (1011) along the axial extension, and the cross-sectional shape of the concentric part clamping area (1011) along the radial direction is an arc shape; and the adjusting crank (3) is arranged in the concentric part clamping area (1011).

3. The feed dog height adjustment mechanism according to claim 2, characterized in that: The adjusting crank (3) is provided with a crank through hole (302) along the axial direction, the cross-sectional shape of the crank through hole (302) along the radial direction matches the cross-sectional shape of the concentric clamping area (1011) along the radial direction, and the adjusting crank (3) is fixedly sleeved in the concentric clamping area (1011) through the crank through hole (302).

4. The feed dog height adjustment mechanism according to claim 2, characterized in that: The outer peripheral surface of the concentric clamping area (1011) is provided with screw threads, and the end of the concentric clamping area (1011) away from the concentric hinge area (1012) is provided with a locking nut (5), and the locking nut (5) is fastened to the concentric clamping area (1011) through the screw threads, so that the adjusting crank (3) is pressed against the slider (2).

5. The feed dog height adjustment mechanism according to claim 4, characterized in that: A blocking ring (103) is provided on the outer peripheral surface of one end of the eccentric portion (102) away from the concentric portion (101), and a connecting groove (104) for connecting to a flat-blade screwdriver is provided on the end surface of one end of the eccentric portion (102) away from the concentric portion (101).

6. The feed dog height adjustment mechanism according to claim 2, characterized in that: The tooth frame (7) is provided with a tooth frame shaft hole, and the tooth frame shaft hole is sleeved on the eccentric part (102); a gasket (6) is also provided between the slider (2) and the tooth frame (7), and the gasket (6) is sleeved on the concentric part hinge area (1012).

7. The feed dog height adjustment mechanism according to claim 1, characterized in that: An extension plate (201) is also provided on the end surface of the slider (2) close to the adjusting crank (3), and the slider connection hole (202) is axially opened on the extension plate (201).

8. The feed dog height adjustment mechanism according to claim 7, characterized in that: The slider connection hole (202) is a threaded hole, and the locking stud (4) is connected to the slider connection hole (202) via threads.

9. A sewing device, characterized in that: It comprises the feed tooth height adjustment mechanism as described in any one of claims 1 to 8, and also comprises a base plate and a feed shaft (11), wherein the tooth lifting shaft (12) and the feed shaft (11) are both hinged in the base plate; the tooth lifting fork crank (13) is arranged on the tooth lifting shaft (12), and a tooth rack seat (9) is arranged on the feed shaft (11), and the end of the tooth rack (7) away from the tooth lifting shaft (12) is hinged to the tooth rack seat (9) through a tooth rack pin (10).

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