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 section and a concentric section which are eccentrically connected, the eccentric section is arranged in a tooth frame shaft hole formed in the tooth frame in a penetrating mode, and the concentric section penetrates through the sliding block and can rotate in the sliding block in the circumferential direction. The eccentric pin is further provided with a height adjusting assembly, the height adjusting assembly and the eccentric pin synchronously move in the circumferential direction, the circumferential movement of the height adjusting assembly drives the circumferential movement of the eccentric pin, and the height of the eccentric section is adjusted. The operation mode of the height adjusting assembly is convenient, fast and simple, a lathe worker can rapidly adjust the height of the feeding tooth, operation of waiting for maintenance personnel in the prior art is not needed, and therefore the operation efficiency of a garment factory can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of a flat-bed sewing machine and a feed dog height adjustment device for a sewing machine, 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 present invention is to provide a feed dog height adjustment mechanism and a sewing device, which are used to solve the problems of cumbersome feed dog height adjustment operation and low working efficiency in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides a feed dog height adjustment mechanism, comprising 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 is connected to the slider via an eccentric pin; the eccentric pin comprises an eccentric section and a concentric section which are eccentrically connected, the eccentric section is passed through a tooth rack shaft hole opened on the tooth rack, the concentric section passes through the slider and can rotate circumferentially in the slider; a height adjustment component is also arranged on the eccentric pin, the height adjustment component moves synchronously with the eccentric pin in the circumferential direction, and the circumferential movement of the height adjustment component drives the circumferential movement of the eccentric pin to adjust the height of the eccentric section.

[0007] Preferably, a first limiting groove is provided on the eccentric section, and a first open retaining ring is sleeved on the eccentric section. The eccentric section passes through the slider and the tooth rack shaft hole, and the first open retaining ring and the slider are located on both sides of the tooth rack shaft hole; the first open retaining ring is arranged in the first limiting groove to limit the axial movement of the tooth rack on the eccentric pin.

[0008] Preferably, the eccentric pin is defined as a first eccentric pin; the slider is defined as a first slider; a second limiting groove is provided at the end of the first eccentric pin away from the first open retaining ring; the height adjustment assembly comprises a thread adjustment knob, a first spring, and a second open retaining ring; the thread adjustment knob is provided with a knob through hole along the axial direction, and the thread adjustment knob is sleeved on the concentric segment of the first eccentric pin through the knob through hole; a knob through hole keyway is provided on the inner wall of the knob through hole, a concentric segment keyway is provided on the concentric segment of the first eccentric pin, and the knob through hole is provided with a keyway of the knob through hole, and the concentric segment keyway is provided on the concentric segment of the first eccentric pin. The hole keyway and the concentric segment keyway are connected by a key, and the thread adjusting knob can move along the length direction of the key; a knob connecting hole is also provided on the thread adjusting knob, and a plurality of shift holes are provided on the end face of the first slider close to the thread adjusting knob, the knob connecting hole is aligned with any shift hole and a locking pin is passed through the two; the first spring is arranged on the side of the thread adjusting knob away from the first slider; the second open retaining ring is arranged in the second limiting groove, one end of the first spring abuts against the end face of the thread adjusting knob, and the other end abuts against the second open retaining ring.

[0009] Preferably, the height adjustment assembly also includes a second gasket and a third gasket, the second gasket and the third gasket are both mounted on the first eccentric pin, and the second gasket and the third gasket are respectively arranged at both ends of the first spring; the second gasket abuts against the adjusting knob, and the third gasket abuts against the second opening retaining ring.

[0010] Preferably, blocking rings are provided on both end faces of the first slider, and a plurality of shift holes are opened on the blocking ring of the first slider close to the tooth adjustment knob; the tooth lifting fork crank is clamped on the outer side surface of the second slider between the two blocking rings; and a first gasket is also provided between the first opening blocking ring and the tooth rack shaft hole.

[0011] Preferably, the eccentric pin is defined as a second eccentric pin; the slider is defined as a second slider; an eccentric pin threaded hole is provided at the end of the second eccentric pin away from the first open retaining ring; the height adjustment assembly comprises an adjusting positioning block, a positioning screw, an adjusting plate, a positioning pin, a second spring, and a limiting screw, the adjusting positioning block is provided with a positioning block through hole in the axial direction, the adjusting positioning block is sleeved on the concentric segment of the second eccentric pin through the positioning block through hole; the adjusting positioning block is provided with a positioning block limiting hole in the radial direction, the positioning block limiting hole is connected to the positioning block through hole, the positioning screw is connected in the positioning block limiting hole by a thread, The positioning screw fastens the second eccentric pin and the adjusting positioning block; the adjusting plate is sleeved on the concentric section of the second eccentric pin, and the adjusting plate can move axially along the second eccentric pin; the positioning pin is fixed on the adjusting plate, the adjusting positioning block is provided with a positioning block connecting hole, and the end of the second slider close to the adjusting positioning block is provided with a plurality of slider connecting holes, the positioning block connecting hole is aligned with any slider connecting hole, and the positioning pin passes through both of them at the same time; the limit screw is arranged in the threaded hole of the eccentric pin, the second spring is sleeved on the concentric section of the second eccentric pin, and the two ends of the second spring are respectively abutted against the adjusting plate and the limit screw.

[0012] Preferably, a blocking ring is provided on the end face of one end of the second slider close to the adjusting positioning block, and a plurality of slider connecting holes are opened on the blocking ring; a fourth gasket is also provided between the second slider and the tooth rack, the fourth gasket is sleeved on the second eccentric pin, and the tooth lifting fork crank is clamped on the outer side surface of the second slider between the blocking ring and the fourth gasket; a first gasket is also provided between the first opening blocking ring and the tooth rack shaft hole.

[0013] Preferably, the eccentric pin is defined as a third eccentric pin; the slider is defined as a third slider; a protrusion is provided at the end of the eccentric section of the third eccentric pin; the height adjustment assembly includes an adjusting crank, a locking stud, and a lock nut, a step is axially provided in a partial area of ​​the concentric section of the third eccentric pin, the adjusting crank is axially provided with a crank through hole, the shape of the crank through hole matches the shape of the partial area of ​​the concentric section with the step, the adjusting crank is sleeved on the step of the concentric section through the crank through hole; the third slider is sleeved on the area of ​​the concentric section where no step is provided; an adjusting groove is provided on the adjusting crank, and a slider positioning hole is provided on the third slider, the adjusting groove is aligned with the slider positioning hole, and the locking stud passes through both of them at the same time; a screw thread is provided on the outer peripheral surface of the end of the third eccentric pin away from the protrusion, and the lock nut is fastened to the second eccentric pin through the screw thread to limit the axial movement of the adjusting crank.

[0014] Preferably, an extension plate is provided on the end face of the third slider close to the adjusting crank, and the slider positioning hole is opened on the extension plate; a fifth gasket is also provided between the third slider and the tooth rack, and the fifth gasket is sleeved on the third eccentric pin, and the tooth-lifting fork crank is clamped on the outer surface of the third slider between the extension plate and the fifth gasket.

[0015] 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.

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

[0017] The utility model relates to a feed dog height adjustment mechanism and sewing equipment. The height adjustment component adopts a variety of methods to drive the eccentric pin to rotate, and the height of the eccentric section is adjusted by rotating the eccentric pin, thereby achieving adjustment of the feed dog height. The operation method of the height adjustment component is convenient and simple, and the lathe operator can quickly adjust the feed dog height without waiting for maintenance personnel to operate as in the prior art, thereby ensuring the operating efficiency of the garment factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a spatial schematic diagram of the sewing device of the utility model;

[0019] Figure 2 This is a schematic diagram of the first angle connection of the first embodiment of the feed dog height adjustment mechanism of the utility model;

[0020] Figure 3It is a schematic diagram of the second angle connection of the first embodiment of the feed dog height adjustment mechanism of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the first embodiment of the feed dog height adjustment mechanism of the utility model;

[0022] Figure 5 It is an exploded view of the first embodiment of the feed dog height adjustment mechanism of the utility model;

[0023] Figure 6 It is a structural schematic diagram of the second embodiment of the feed dog height adjustment mechanism of the utility model;

[0024] Figure 7 It is an exploded view of the second embodiment of the feed dog height adjustment mechanism of the utility model;

[0025] Figure 8 It is an exploded view of the third embodiment of the feed dog height adjustment mechanism of the utility model;

[0026] Fig. 9 It is a working schematic diagram of the third embodiment of the feed dog height adjustment mechanism of the utility model.

[0027] Description of reference numerals:

[0028] 1. Bottom plate; 2. Tooth lifting shaft; 3. Tooth lifting fork crank; 4. Tooth rack seat; 5. Feeding shaft; 6. Tooth rack pin; 7. Tooth rack; 701. Tooth rack shaft hole; 8. Feeding tooth; 9. Tooth adjustment knob; 901. Knob connecting hole; 902. Knob through hole; 10. Third gasket; 11. Second open retaining ring; 12. First spring; 13. First gasket; 14. First open retaining ring; 15. First eccentric pin; 1501. First limiting groove; 1502. Eccentric section of first eccentric pin; 1503. Concentric section of first eccentric pin; 1504. Second limiting groove; 1505. Concentric section keyway; 16. Second gasket; 17. First slider; 1701. Position hole; 18. Flat key; 19. Locking pin; 20. Limit screw; 21. Second spring Spring; 22. Fourth gasket; 23. Second eccentric pin; 2301. eccentric pin threaded hole; 2302. Second eccentric pin eccentric section; 2303. Second eccentric pin concentric section; 24. Second slider; 2401. Slider connecting hole; 25. Adjusting positioning block; 2501. Positioning block connecting hole; 26. Positioning screw; 27. Positioning pin; 28. Adjusting plate; 29. ​​Locking nut; 30. Locking stud; 31. Third eccentric pin; 3101. Step; 3102. Third eccentric pin eccentric section; 3103. Third eccentric pin concentric section; 3104. Protrusion; 32. Fifth gasket; 33. Third slider; 34. Adjusting crank; 3401. Adjusting slot; 3402. Crank through hole; 35. Extension plate; 3501. Slider positioning hole. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] The utility model provides a feed dog height adjustment mechanism. For the convenience of description, the extension direction of the eccentric pin is defined as the left-right direction, and the extension direction of the tooth frame 7 is the front-back direction. Therefore, the front end of the tooth frame 7 is provided with a tooth frame shaft hole 701 connected with the eccentric section, and the rear end of the tooth frame 7 is connected with the feed shaft 5 through the tooth frame seat 4 and the tooth frame pin 6; the eccentric section is located at the left end of the eccentric pin, and the concentric section is located at the right end of the eccentric pin.

[0032] like Figure 1-Figure 9 As shown, the utility model provides a feed tooth height adjustment mechanism, including a tooth lifting shaft 2, a tooth lifting fork crank 3, a tooth rack 7, and a feed tooth 8, the feed tooth 8 is arranged on the tooth rack 7, and a slider is arranged at the right end of the tooth rack 7, and the slider is slidably connected to the fork groove of the tooth lifting fork crank 3; the front end of the tooth rack 7 is connected to the slider through an eccentric pin; the eccentric pin includes an eccentric section and a concentric section that are eccentrically connected, the eccentric section is inserted into a tooth rack shaft hole 701 opened on the tooth rack 7, and the concentric section passes through the slider and can rotate circumferentially in the slider; a height adjustment component is also arranged on the eccentric pin, the height adjustment component and the eccentric pin move synchronously in the circumferential direction, and the circumferential movement of the height adjustment component drives the circumferential movement of the eccentric pin to adjust the height of the eccentric section.

[0033] In the utility model, the eccentric section of the eccentric pin is inserted into the axis hole 701 of the tooth rack, and the concentric section is inserted into the slider and the height adjustment component. The eccentric pin is driven to move circumferentially through the height adjustment component, thereby realizing the height change of the eccentric section; when the eccentric pin moves circumferentially, the slider and the tooth-lifting fork crank 3 are kept fixed, so that the position between the tooth rack 7 connected to the eccentric section and the tooth-lifting fork crank 3 changes, thereby realizing the up and down change of the position of the feed tooth 8, and realizing the adjustment of the height of the feed tooth 8.

[0034] The height adjustment assembly in the utility model is divided into the following three embodiments:

[0035] First embodiment:

[0036] In this embodiment, if Figure 2-Figure 5 As shown, a first limiting groove 1501 is provided at the left end of the eccentric section, and a first gasket 13 and a first opening retaining ring 14 are sleeved on the eccentric section. The eccentric section passes through the slider, the tooth frame shaft hole 701, and the first gasket 13 from right to left in sequence. The first gasket 13 is located on the left side of the tooth frame shaft hole 701, and the slider is located on the right side of the tooth frame shaft hole 701; the first opening retaining ring 14 is arranged in the first limiting groove 1501, and is used to limit the axial movement of the tooth frame 7 on the eccentric pin in the left and right directions, but will not affect the circumferential rotational movement of the eccentric pin; the first gasket 13 is located between the first opening retaining ring 14 and the tooth frame shaft hole 701.

[0037] In this embodiment, if Figure 5As shown, the eccentric pin is defined as the first eccentric pin 15; the slider is defined as the first slider 17; the right end of the first eccentric pin 15 is provided with a second limiting groove 1504; the height adjustment component includes a thread adjustment knob 9, a first spring 12, and a second open retaining ring 11; a knob through hole 902 is provided through the center of the thread adjustment knob 9 along the axial direction, and the thread adjustment knob 9 is sleeved on the first eccentric pin concentric segment 1503 through the knob through hole 902; a knob through hole keyway is provided on the inner wall of the knob through hole 902, and a concentric segment keyway 1505 is provided on the first eccentric pin concentric segment 1503, and the knob through hole keyway and the concentric segment keyway are provided on the inner wall of the knob through hole 902. The groove 1505 is connected by a flat key 18, and the adjusting knob 9 can move left and right along the length direction of the flat key 18; the adjusting knob 9 is also provided with a knob connection hole 901 that runs through left and right, and a plurality of shift holes 1701 are provided on the right end face of the first slider 17, the knob connection hole 901 is aligned with any shift hole 1701, and a locking pin 19 is passed through the two; the first spring 12 is arranged on the right side of the adjusting knob 9; the second open retaining ring 11 is arranged in the second limiting groove 1504, the left end of the first spring 12 abuts against the right end face of the adjusting knob 9, and the right end abuts against the left end face of the second open retaining ring 11. The locking pin 19 passes through the knob connection hole 901 and the shift hole 1701 from right to left in sequence, and the locking pin 19 is connected to the knob connection hole 901 by an interference fit; when the adjusting knob 9 moves to the right, the locking pin 19 moves to the right along with the adjusting knob 9.

[0038] In this embodiment, if Figure 5 As shown, the height adjustment assembly also includes a second gasket 16 and a third gasket 10. The second gasket 16 and the third gasket 10 are both sleeved on the first eccentric pin 15. The second gasket 16 and the third gasket 10 are respectively arranged at both ends of the first spring 12. The second gasket 16 abuts against the adjusting knob 9, and the third gasket 10 abuts against the second opening retaining ring 11. The second gasket 16 abuts against the right end face of the adjusting knob 9 through the first spring 12 to prevent the flat key 18 from falling out. The second opening retaining ring 11 is used to block the third gasket 10 and provide elastic support for the first spring 12.

[0039] In this embodiment, if Figure 2 , Figure 3 , Figure 5 As shown, blocking rings are provided on both end faces of the first slider 17, and a plurality of shift holes 1701 are opened on the blocking ring at the right end of the first slider 17 in the left-right direction; the lifting fork crank 3 is clamped on the outer side of the second slider 24 between the two blocking rings.

[0040] like Figure 2-Figure 5As shown, the working principle of the first embodiment is as follows: the first slider 17 is slidably hinged with the tooth lifting fork crank 3, the first eccentric pin concentric segment 1503 is hinged with the first slider 17, the first eccentric pin eccentric segment 1502 is hinged with the tooth frame 7 through the tooth frame shaft hole 701, and the locking pin 19 simultaneously passes through the knob connection hole 901 and the shift hole 1701, so as to achieve the relative fixation of the first slider 17 and the tooth adjustment knob 9; at the same time, the tooth adjustment knob 9 moves synchronously with the first eccentric pin 15 in the circumferential direction through the flat key 18, and the tooth adjustment knob 9 is squeezed by the first spring 12 so that the tooth adjustment knob 9 is close to the first slider 17. When the tooth lifting shaft 2 rotates, the tooth lifting shaft 2 drives the tooth lifting fork crank 3 to swing up and down, and then drives the first eccentric pin 15 to move up and down through the first slider 17, and the eccentric segment 1502 of the first eccentric pin is connected to the tooth frame 7, so as to drive the tooth frame 7 and the feed tooth 8 to move up and down.

[0041] When the height of the feed dog 8 needs to be adjusted, the operator grabs the tooth adjustment knob 9 and applies a pulling force to the right, the tooth adjustment knob 9 moves to the right along the flat key 18, and drives the locking pin 19 to disengage from the shift hole 1701 on the first slider 17, at which time the first spring 12 is compressed; the tooth adjustment knob 9 is rotated, and the tooth adjustment knob 9 drives the first eccentric pin 15 to rotate through the flat key 18, so that the relative position of the eccentric section 1502 of the first eccentric pin and the tooth frame 7 changes. Since the first eccentric pin concentric section 1503 is hinged to the first slider 17, and the first slider 17 is slidably connected to the tooth lifting fork crank 3, the position of the tooth frame 7 relative to the tooth lifting fork crank 3 changes, thereby realizing the up and down changes in the position of the feed dog 8 installed on the tooth frame 7. When the height of the feed dog 8 is adjusted to the corresponding gear position, the locking pin 19 is aligned with the corresponding gear hole 1701 on the first slider 17, and the adjusting knob 9 is loosened. Under the elastic force of the first spring 12, the adjusting knob 9 moves to the left along the flat key 18 and abuts against the first slider 17. Under the joint action of the locking pin 19 and the flat key 18, the first eccentric pin 15 and the first slider 17 remain fixed, thereby ensuring that the height of the feed dog 8 remains unchanged during operation.

[0042] Second embodiment:

[0043] The difference between this embodiment and the first embodiment is that:

[0044] In this embodiment, if Figure 6-Figure 7As shown, the eccentric pin is defined as the second eccentric pin 23; the slider is defined as the second slider 24; the right end of the second eccentric pin 23 is provided with an eccentric pin threaded hole 2301; the height adjustment assembly includes an adjustment positioning block 25, a positioning screw 26, an adjustment plate 28, a positioning pin 27, a second spring 21, and a limit screw 20, the adjustment positioning block 25 is provided with a positioning block through hole extending through the axial direction, and the adjustment positioning block 25 is sleeved on the second eccentric pin concentric segment 2303 through the positioning block through hole; the bottom surface of the adjustment positioning block 25 is provided with a positioning block limit hole from bottom to top, the positioning block limit hole is connected with the positioning block through hole, the positioning screw 26 is connected in the positioning block limit hole by a thread, and the positioning screw 26 connects the second eccentric pin 23 with the adjustment positioning block 2 5 is fastened and connected; the adjusting plate 28 is sleeved on the second eccentric pin concentric section 2303, and the adjusting plate 28 can move left and right along the axial direction of the second eccentric pin 23; the positioning pin 27 is riveted on the left end face of the adjusting plate 28, the adjusting positioning block 25 is provided with a positioning block connecting hole 2501 penetrating in the left and right direction, and the right end of the second slider 24 is provided with a plurality of slider connecting holes 2401 in the left and right direction, the positioning block connecting hole 2501 is aligned with any slider connecting hole 2401, and the positioning pin 27 penetrates both at the same time; the limiting screw 20 is set in the eccentric pin threaded hole 2301, the second spring 21 is sleeved on the second eccentric pin concentric section 2303, and the two ends of the second spring 21 are respectively in contact with the adjusting plate 28 and the limiting screw 20.

[0045] In this embodiment, the positioning screw 26 fastens the second eccentric pin 23 to the adjusting positioning block 25, and at the same time, the left end face of the adjusting positioning block 25 abuts against the right end face of the second slider 24, so the adjusting positioning block 25 will also limit the axial movement of the second slider 24, but will not affect the circumferential movement.

[0046] In this embodiment, if Figure 7 As shown, a blocking ring is arranged on the right end face of the second slider 24, and a plurality of slider connecting holes 2401 are opened on the blocking ring; a fourth gasket 22 is also arranged between the second slider 24 and the tooth rack 7, and the fourth gasket 22 is sleeved on the second eccentric pin 23, and the tooth lifting fork crank 3 is clamped on the outer surface of the second slider 24 between the blocking ring and the fourth gasket 22.

[0047] The working principle of the second embodiment is as follows: the second slider 24 is slidably hinged with the tooth lifting fork crank 3, the second eccentric pin concentric section 2303 is hinged with the second slider 24, and the second eccentric pin eccentric section 2302 is hinged with the tooth frame 7 through the tooth frame shaft hole 701. The second spring 21 makes the adjustment plate 28 close to the adjustment positioning block 25, and the positioning pin 27 on the adjustment plate 28 simultaneously passes through the positioning block connection hole 2501 and the slider connection hole 2401, so as to achieve the relative fixation of the second slider 24 and the adjustment positioning block 25; at the same time, the adjustment positioning block 25 moves synchronously with the second eccentric pin 23 in the circumferential direction through the positioning screw 26. When the tooth lifting shaft 2 rotates, the tooth lifting shaft 2 drives the tooth lifting fork crank 3 to swing up and down, and then drives the second eccentric pin 23 to move up and down through the second slider 24, and the second eccentric pin eccentric section 2302 is connected to the tooth frame 7, thus driving the tooth frame 7 and the feed tooth 8 to move up and down.

[0048] When the height of the feed dog 8 needs to be adjusted, the operator grabs the adjustment plate 28 and applies a pulling force to the right, the adjustment plate 28 moves to the right along the second eccentric pin 23, and drives the positioning pin 27 to disengage from the slider connection hole 2401 on the second slider 24 (but the positioning pin 27 and the positioning block connection hole 2501 are not disengaged), at this time the second spring 21 is compressed by force; the adjustment plate 28 is rotated, the adjustment plate 28 drives the adjustment positioning block 25 to rotate through the positioning pin 27, and the adjustment positioning block 25 drives the second eccentric pin 23 to rotate through the positioning screw 26, so that the relative position of the eccentric section 2302 of the second eccentric pin and the tooth frame 7 changes. Since the second eccentric pin concentric section 2303 is hinged with the second slider 24, and the second slider 24 is slidably connected with the tooth lifting fork crank 3, the position of the tooth frame 7 relative to the tooth lifting fork crank 3 changes, so that the position of the feed dog 8 installed on the tooth frame 7 changes up and down. When the height of the feed dog 8 is adjusted to the corresponding position, the positioning block connecting hole 2501 on the positioning block 25 is aligned with a certain slider connecting hole 2401, and the adjusting plate 28 is loosened. Under the elastic force of the second spring 21, the adjusting plate 28 moves to the left along the second eccentric pin 23, and the positioning pin 27 is inserted into the corresponding slider connecting hole 2401. The positioning block 25 is adjusted to be fixed to the second slider 24, and the corresponding second eccentric pin 23 is fixed to the second slider 24. The position of the feed tooth 8 remains fixed relative to the tooth lifting fork crank 3, and the height adjustment of the feed tooth 8 is completed.

[0049] Third embodiment:

[0050] In this embodiment, if Figure 8 , Fig. 9As shown, the eccentric pin is defined as the third eccentric pin 31; the slider is defined as the third slider 33; the left end of the eccentric section 3102 of the third eccentric pin is provided with a protrusion 3104; the height adjustment component includes an adjusting crank 34, a locking stud 30, and a locking nut 29; a portion of the concentric section 3103 of the third eccentric pin is axially provided with a step 3101 from right to left; the adjusting crank 34 is axially provided with a crank through hole 3402; the shape of the crank through hole 3402 matches the shape of the portion of the concentric section provided with the step 3101; the adjusting crank 34 is provided with a crank through hole 3402 through the crank The through hole 3402 is sleeved on the step 3101 of the concentric section; the third slider 33 is sleeved on the area of ​​the concentric section where the step 3101 is not provided; the adjusting crank 34 is provided with an adjusting groove 3401, and the third slider 33 is provided with a slider positioning hole 3501, the adjusting groove 3401 is aligned with the slider positioning hole 3501, and the locking stud 30 penetrates both in the left and right directions at the same time; the outer peripheral surface of the right end of the third eccentric pin 31 is provided with a screw thread, and the anti-loosening nut 29 is fastened to the second eccentric pin 23 through the screw thread, which is used to limit the axial movement of the adjusting crank 34. The left end face of the adjusting crank 34 is in contact with the right end face of the third slider 33 and is fastened through the anti-loosening nut 29, which limits the axial movement of the third slider 33 but does not affect its circumferential movement. The slider positioning hole 3501 is a threaded hole, and the locking stud 30 is connected to the slider positioning hole 3501 through a thread.

[0051] In this embodiment, if Figure 8 As shown, an extension plate 35 is downwardly arranged on the right end face of the third slider 33, and a slider positioning hole 3501 is opened on the extension plate 35; a fifth gasket 32 ​​is also arranged between the third slider 33 and the tooth rack 7, and the fifth gasket 32 ​​is sleeved on the third eccentric pin 31, and the tooth lifting fork crank 3 is clamped on the outer surface of the third slider 33 between the extension plate 35 and the fifth gasket 32.

[0052] The working principle of the third embodiment is as follows: the third slider 33 is slidably hinged with the tooth lifting fork crank 3, the third eccentric pin concentric section 3103 is hinged with the third slider 33, and the third eccentric pin eccentric section 3102 is hinged with the tooth frame 7 through the tooth frame shaft hole 701. The adjustment crank 34 is abutted against the third slider 33 through the anti-loosening nut 29, and the locking stud 30 simultaneously passes through the adjustment groove 3401 and the slider positioning hole 3501 to achieve relative fixation of the adjustment crank 34 and the third slider 33; at the same time, the adjustment crank 34 moves synchronously with the third eccentric pin 31 in the circumferential direction through the crank through hole 3402 and the step 3101. When the tooth lifting shaft 2 rotates, the tooth lifting shaft 2 drives the tooth lifting fork crank 3 to swing up and down, and then drives the third eccentric pin 31 to move up and down through the third slider 33, and the eccentric section 3102 of the third eccentric pin is connected to the tooth frame 7, thereby driving the tooth frame 7 and the feed tooth 8 to move up and down.

[0053] When the height of the feed dog 8 needs to be adjusted, the operator loosens the locking stud 30, and the adjusting crank 34 and the third slider 33 change from a relatively fixed state to a separated state; the adjusting crank 34 is rotated with the third eccentric pin 31 as a fulcrum, and the adjusting crank 34 drives the third eccentric pin 31 to rotate, so that the relative position of the eccentric section 3102 of the third eccentric pin and the tooth frame 7 changes. Since the concentric section 3103 of the third eccentric pin is hinged with the third slider 33, and the third slider 33 is slidably connected with the tooth lifting fork crank 3, the position of the tooth frame 7 relative to the tooth lifting fork crank 3 changes, thereby realizing the up and down change of the position of the feed dog 8 installed on the tooth frame 7. When the height of the feed dog 8 is adjusted to the corresponding position, tighten the locking stud 30 to restore the adjusting crank 34 and the third slider 33 to a relatively fixed state, and then the third eccentric pin 31 and the third slider 33 are fixed.

[0054] In this embodiment, since the adjusting crank 34 can be rotated at any angle within the limited range of the adjusting slot 3401, this embodiment can achieve stepless adjustment of the height of the feed dog 8.

[0055] To achieve the above purpose or other purposes, the utility model also discloses a sewing device, such as Figure 1-Figure 3 As shown, the feed dog height adjustment mechanism includes the above-mentioned feed dog height adjustment mechanism, a bottom plate 1, and a feed shaft 5. The tooth lifting shaft 2 and the feed shaft 5 are both hinged in the bottom plate 1. The tooth lifting fork crank 3 is arranged on the tooth lifting shaft 2. The feed shaft 5 is provided with a tooth frame seat 4. The end of the tooth frame 7 away from the tooth lifting shaft 2 is hinged to the tooth frame seat 4 through a tooth frame pin 6. The axial movement of the tooth lifting shaft 2 and the feed shaft 5 is limited by the bottom plate 1, but their circumferential rotation movement is carried out normally.

[0056] The feed dog height adjustment mechanism and sewing equipment involved in the utility model have the following beneficial effects:

[0057] 1. The height adjustment assembly in the utility model adjusts the height of the feed dog 8, which is simple and convenient to operate. The lathe operator can adjust it by himself without waiting for the maintenance personnel to adjust it as in the prior art, thereby improving work efficiency.

[0058] 2. The third embodiment of the present invention adopts an adjusting crank 34 and a locking stud 30 , which can be rotated at any angle within the limit range of the adjusting crank 34 , thereby realizing stepless adjustment of the height of the feed dog 8 .

[0059] In summary, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0060] 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, comprising a tooth lifting shaft (2), a tooth lifting fork crank (3), a tooth frame (7), and a feed dog (8), wherein the feed dog (8) is arranged on the tooth frame (7), and a slider is arranged at one end of the tooth frame (7), and the slider is slidably connected to the fork groove of the tooth lifting fork crank (3); characterized in that: One end of the tooth frame (7) is connected to the slider via an eccentric pin; the eccentric pin comprises an eccentric section and a concentric section which are eccentrically connected; the eccentric section is inserted into a tooth frame axial hole (701) provided on the tooth frame (7); the concentric section passes through the slider and can rotate circumferentially in the slider; a height adjustment component is also provided on the eccentric pin; the height adjustment component moves synchronously with the eccentric pin in the circumferential direction; the circumferential movement of the height adjustment component drives the circumferential movement of the eccentric pin to adjust the height of the eccentric section.

2. The feed dog height adjustment mechanism according to claim 1, characterized in that: The eccentric section is provided with a first limiting groove (1501), and a first open retaining ring (14) is sleeved on the eccentric section. The eccentric section passes through the slider and the tooth frame shaft hole (701), and the first open retaining ring (14) and the slider are located on both sides of the tooth frame shaft hole (701); the first open retaining ring (14) is arranged in the first limiting groove (1501) to limit the axial movement of the tooth frame (7) on the eccentric pin.

3. The feed dog height adjustment mechanism according to claim 2, characterized in that: The eccentric pin is defined as a first eccentric pin (15); the slider is defined as a first slider (17); a second limiting groove (1504) is provided at the end of the first eccentric pin (15) away from the first opening retaining ring (14); The height adjustment assembly comprises a thread adjustment knob (9), a first spring (12), and a second open retaining ring (11); the thread adjustment knob (9) is provided with a knob through hole (902) along the axial direction, and the thread adjustment knob (9) is sleeved on the first eccentric pin concentric section (1503) through the knob through hole (902); a knob through hole keyway is provided on the inner wall of the knob through hole (902), and a concentric section keyway (1505) is provided on the first eccentric pin concentric section (1503); the knob through hole keyway and the concentric section keyway (1505) are connected by a key, and the thread adjustment knob (9) can move along the length direction of the key; The tooth adjustment knob (9) is also provided with a knob connecting hole (901); the end surface of the first slider (17) close to the tooth adjustment knob (9) is provided with a plurality of shift holes (1701); the knob connecting hole (901) is aligned with any shift hole (1701) and a locking pin (19) is passed through the two; the first spring (12) is arranged on a side of the tooth adjustment knob (9) away from the first slider (17); the second open retaining ring (11) is arranged in the second limiting groove (1504); one end of the first spring (12) abuts against the end surface of the tooth adjustment knob (9), and the other end abuts against the second open retaining ring (11).

4. The feed dog height adjustment mechanism according to claim 3, characterized in that: The height adjustment assembly further comprises a second gasket (16) and a third gasket (10), wherein the second gasket (16) and the third gasket (10) are both sleeved on the first eccentric pin (15), and the second gasket (16) and the third gasket (10) are respectively arranged at two ends of the first spring (12); the second gasket (16) abuts against the adjusting knob (9), and the third gasket (10) abuts against the second opening retaining ring (11).

5. The feed dog height adjustment mechanism according to claim 3, characterized in that: Blocking rings are provided on both end faces of the first slider (17); a plurality of shifting holes (1701) are provided on the blocking ring of the first slider (17) near the tooth adjustment knob (9); the tooth lifting fork crank (3) is clamped on the outer side of the second slider (24) between the two blocking rings; and a first gasket (13) is also provided between the first opening blocking ring (14) and the tooth rack shaft hole (701).

6. The feed dog height adjustment mechanism according to claim 2, characterized in that: The eccentric pin is defined as a second eccentric pin (23); the slider is defined as a second slider (24); an eccentric pin threaded hole (2301) is provided at the end of the second eccentric pin (23) away from the first opening retaining ring (14); The height adjustment assembly comprises an adjustment positioning block (25), a positioning screw (26), an adjustment plate (28), a positioning pin (27), a second spring (21), and a limiting screw (20); the adjustment positioning block (25) is provided with a positioning block through hole in the axial direction, and the adjustment positioning block (25) is sleeved on the second eccentric pin concentric section (2303) through the positioning block through hole; the adjustment positioning block (25) is provided with a positioning block limiting hole in the radial direction, and the positioning block limiting hole is communicated with the positioning block through hole; the positioning screw (26) is connected in the positioning block limiting hole by threading, and the positioning screw (26) fastens the second eccentric pin (23) and the adjustment positioning block (25); the adjustment plate (28) is sleeved on the second eccentric pin concentric section (2303), and the adjustment plate (28) can move axially along the second eccentric pin (23); The positioning pin (27) is fixed on the adjustment plate (28), the adjustment positioning block (25) is provided with a positioning block connecting hole (2501), and the end of the second slider (24) close to the adjustment positioning block (25) is provided with a plurality of slider connecting holes (2401), the positioning block connecting hole (2501) is aligned with any slider connecting hole (2401), and the positioning pin (27) passes through both at the same time; the limit screw (20) is arranged in the eccentric pin threaded hole (2301), the second spring (21) is sleeved on the second eccentric pin concentric section (2303), and the two ends of the second spring (21) are respectively in contact with the adjustment plate (28) and the limit screw (20).

7. The feed dog height adjustment mechanism according to claim 6, characterized in that: A blocking ring is arranged on the end face of one end of the second slider (24) close to the adjustment positioning block (25), and a plurality of slider connecting holes (2401) are provided on the blocking ring; a fourth gasket (22) is also arranged between the second slider (24) and the tooth frame (7), and the fourth gasket (22) is sleeved on the second eccentric pin (23); the tooth lifting fork crank (3) is clamped on the outer side face of the second slider (24) between the blocking ring and the fourth gasket (22); a first gasket (13) is also arranged between the first opening blocking ring (14) and the tooth frame shaft hole (701).

8. The feed dog height adjustment mechanism according to claim 1, characterized in that: The eccentric pin is defined as a third eccentric pin (31); the slider is defined as a third slider (33); a protrusion (3104) is provided at the end of the eccentric section (3102) of the third eccentric pin; the height adjustment assembly comprises an adjustment crank (34), a locking stud (30), and a locking nut (29); a step (3101) is provided in a partial area of ​​the concentric section (3103) of the third eccentric pin in the axial direction; a crank through hole (3402) is provided in the axial direction of the adjustment crank (344); the shape of the crank through hole (3402) matches the shape of a partial area of ​​the concentric section in which the step (3101) is provided; the adjustment crank (34) is sleeved on the step (3101) of the concentric section through the crank through hole (3402); the third slider (33) is sleeved on an area of ​​the concentric section where the step (3101) is not provided; The adjusting crank (34) is provided with an adjusting groove (3401), the third slider (33) is provided with a slider positioning hole (3501), the adjusting groove (3401) is aligned with the slider positioning hole (3501), and the locking stud (30) passes through both at the same time; The outer peripheral surface of the end of the third eccentric pin (31) away from the protrusion (3104) is provided with a screw thread, and the anti-loosening nut (29) is fastened to the second eccentric pin (23) through the screw thread to limit the axial movement of the adjusting crank (34).

9. The feed dog height adjustment mechanism according to claim 8, characterized in that: An extension plate (35) is provided on an end surface of the third slider (33) close to the adjusting crank (34), and the slider positioning hole (3501) is opened on the extension plate (35); a fifth gasket (32) is also provided between the third slider (33) and the tooth frame (7), and the fifth gasket (32) is sleeved on the third eccentric pin (31), and the tooth lifting fork crank (3) is clamped on the outer side surface of the third slider (33) between the extension plate (35) and the fifth gasket (32).

10. A sewing device, characterized in that: It comprises the feed tooth height adjustment mechanism as described in any one of claims 1 to 9, and also comprises a base plate (1) and a feed shaft (5), wherein the tooth lifting shaft (2) and the feed shaft (5) are both hinged in the base plate (1); the tooth lifting fork crank (3) is arranged on the tooth lifting shaft (2), and a tooth rack seat (4) is arranged on the feed shaft (5), and the end of the tooth rack (7) away from the tooth lifting shaft (2) is hinged to the tooth rack seat (4) through a tooth rack pin (6).

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