Feeding tooth height adjusting mechanism and sewing machine

Abstract

The utility model discloses a feeding tooth height adjusting mechanism and a sewing machine in the technical field of sewing machines, and the feeding tooth height adjusting mechanism comprises a feed lifting tooth shaft, a feed lifting tooth fork-shaped crank, a tooth frame, a feed lifting tooth driving crank, an eccentric pin, an adjusting knob and a locking assembly, the feed lifting tooth fork-shaped crank is rotatably sleeved on the feed lifting tooth shaft, and a first sliding groove and a second sliding groove are formed on the feed lifting tooth fork-shaped crank; one end of the tooth frame is connected with a first sliding block which is slidably connected into the first sliding groove, the tooth lifting driving crank is fixedly connected with the tooth lifting shaft and is provided with a connecting through hole, the eccentric pin comprises a concentric section which is rotatably and coaxially installed in the connecting through hole and an eccentric section which is connected with a second sliding block in the second sliding groove, and the adjusting knob is fixedly connected with the concentric section. And the locking assembly is mounted between the adjusting knob and the feed lifting driving crank. The height of the feeding teeth can be adjusted only by manually screwing the locking component, so that the trouble of screwing a screw can be avoided, errors can be prevented, the maintenance cost can be reduced, and the working efficiency can be improved.

Description

Technical Field

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

[0002] When using a sewing machine for sewing operations, for fabrics of different thicknesses, different tooth heights (feed tooth heights) are required to adapt to the feeding effect. That is, when the fabric is thicker and causes sewing to be unsmooth, the teeth need to be raised; when the fabric is thinner and causes the fabric to be scratched, the teeth need to be lowered.

[0003] In the prior art, to adjust the tooth height of the sewing machine, it is necessary to loosen the tooth-lifting fork-type crank fixedly installed on the tooth-lifting shaft, and lift or lower the tooth-lifting fork-type crank. The above adjustment method requires the sewing workshop worker to use a screwdriver to loosen the screw, and the screw requires a large force to loosen and fix. Not only is it inconvenient to operate, but there is also a situation where the sewing worker cannot loosen or tighten the screw, and a professional maintenance worker needs to be found to adjust it. This will cause the sewing operation to be interrupted, greatly reducing work efficiency.

[0004] Therefore, how to achieve convenient adjustment of the feed dog height of a sewing machine has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a feed dog height adjustment mechanism to solve the technical problem of inconvenient feed dog height adjustment in existing sewing machines.

[0006] The technical solution adopted by the utility model is: a feed dog height adjustment mechanism, comprising:

[0007] Tooth lifting axis;

[0008] A tooth-lifting fork-shaped crank, one end of which is rotatably sleeved on the tooth-lifting shaft, and the other end of which is formed with a first sliding groove and a second sliding groove;

[0009] A tooth rack, one end of which is provided with a first sliding block, wherein the first sliding block is slidably connected in a first sliding groove;

[0010] A tooth lifting driving crank, wherein the tooth lifting driving crank is arranged on one side of the tooth lifting fork-shaped crank, one end of the tooth lifting driving crank is fixedly connected to the tooth lifting shaft, and the other end of the tooth lifting driving crank is formed with a connecting through hole;

[0011] An eccentric pin, wherein the eccentric pin comprises a concentric section and an eccentric section, wherein the concentric section is rotatably and coaxially installed in the connecting through hole, and a second slider is rotatably installed on the eccentric section, and the second slider is slidably connected in the second slide groove;

[0012] An adjusting knob, wherein the adjusting knob is fixedly connected to the concentric segment;

[0013] A locking assembly is installed between the adjusting knob and the tooth lifting driving crank. The locking assembly has an unlocking state that allows the adjusting knob and the tooth lifting driving crank to rotate relative to each other in the circumferential direction of the eccentric pin, and a locking state that fixes the adjusting knob and the tooth lifting driving crank in the circumferential direction of the eccentric pin.

[0014] Preferably, the locking assembly includes a stationary tooth, a movable tooth, a locking plate and a telescopic member, the stationary tooth is formed on the tooth lifting drive crank, the movable tooth is formed on the side of the locking plate close to the tooth lifting drive crank, the locking plate is sleeved on the outside of the adjusting knob and is slidably connected to the adjusting knob, and the telescopic member is installed between the locking plate and the adjusting knob to make the movable tooth approach or move away from the stationary tooth.

[0015] Preferably, the static teeth are distributed along the circumferential direction of the connecting through hole at the other end of the tooth lifting driving crank, the locking plate includes a first plate body perpendicular to the eccentric pin and a second plate body parallel to the eccentric pin, the movable teeth are distributed along the circumferential direction of the connecting through hole at one end of the first plate body, the telescopic part is installed between the adjusting knob and the second plate body, and the locking plate is slidably connected to the adjusting knob along the radial direction of the connecting through hole.

[0016] Preferably, the static teeth are distributed on the end face of the tooth lifting driving crank close to the adjusting knob along the circumferential direction of the connecting through hole, and the dynamic teeth are distributed on the end face of the tooth lifting driving crank close to the adjusting knob along the circumferential direction of the connecting through hole. The telescopic part is installed between the adjusting knob and the locking plate, and the locking plate is slidingly connected to the adjusting knob along the axial direction of the connecting through hole.

[0017] Preferably, the telescopic member is a compression spring.

[0018] Preferably, the adjusting knob is a reduction motor drivingly connected to the eccentric pin, and an electromagnet for placing the locking assembly in an unlocked state is installed between the reduction motor and the locking plate.

[0019] Preferably, the telescopic member is an electric telescopic rod, and the adjusting knob is a reduction motor drivingly connected to the eccentric pin.

[0020] Preferably, the first slide groove is arranged above the second slide groove, and the first slide groove and the second slide groove are arranged in parallel.

[0021] Preferably, one end of the eccentric segment away from the concentric segment is fixedly connected to an external threaded segment, and one end of the concentric segment away from the eccentric segment is fixedly connected to a planar connecting segment.

[0022] The second purpose of the utility model is to provide a sewing machine, which includes the above-mentioned feed dog height adjustment mechanism.

[0023] Beneficial effects of the utility model:

[0024] The utility model adopts an indirect transmission method to rotatably connect the tooth lifting fork crank with the tooth lifting shaft, and fix the tooth lifting driving crank on the tooth lifting shaft, cooperate with the eccentric pin penetrated on the tooth lifting driving crank and the second sliding block slidably connected to the tooth lifting fork crank, as well as the adjusting knob installed on the eccentric pin and the locking assembly installed between the adjusting knob and the tooth lifting driving crank, so that the tooth lifting driving crank can transmit and move between the tooth lifting shaft and the tooth lifting fork crank to realize the tooth lifting and feeding action, and at the same time, the eccentric pin is rotated by the adjusting knob, and the relative rotation of the eccentric pin and the second sliding block in the second slide groove of the tooth lifting fork crank is cooperated, so as to realize the relative movement of the tooth lifting driving crank and the tooth lifting fork crank in the circumferential direction of the tooth lifting shaft, thereby realizing the convenient adjustment of the feeding tooth height, maintaining the continuity of the sewing operation, and improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the feed dog height adjustment mechanism of the utility model;

[0026] Figure 2 It is a top view of the feed dog height adjustment mechanism of the utility model;

[0027] Figure 3 This is one of the partial schematic diagrams of the feed dog height adjustment mechanism of the utility model;

[0028] Figure 4 This is the second partial schematic diagram of the feed dog height adjustment mechanism of the utility model;

[0029] Figure 5 The diagram is a positional relationship diagram of the adjustment knob and the locking plate;

[0030] Figure 6 It is a three-dimensional schematic diagram of a tooth-lifting fork type crank;

[0031] Figure 7 This is one of the three-dimensional schematic diagrams of the tooth lifting drive crank;

[0032] Figure 8 The second is a three-dimensional schematic diagram of the tooth lifting drive crank;

[0033] Fig. 9 is a three-dimensional schematic diagram of a locking plate;

[0034] Fig.10 is a three-dimensional schematic diagram of an eccentric pin;

[0035] Fig.11It is a schematic diagram of the connection between the tooth lifting drive crank and the locking assembly.

[0036] Description of reference numerals in the figures:

[0037] 1. Tooth lifting shaft; 2. Tooth lifting fork crank; 3. First slide groove; 4. Second slide groove; 5. Tooth rack; 6. First slider; 7. Tooth lifting drive crank; 8. Connecting through hole; 9. Eccentric pin; 10. Concentric section; 11. Eccentric section; 12. Second slider; 13. Adjustment knob; 14. Stationary tooth; 15. Moving tooth; 16. Compression spring; 17. Locking plate; 18. Telescopic member; 19. First plate body; 20. Second plate body; 21. Through groove; 22. External thread section; 23. Plane connection section; 24. Retaining ring; 25. Gasket; 26. Nut; 27. Feeding shaft; 28. Feeding crank; 29. ​​Feeding tooth. DETAILED DESCRIPTION

[0038] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0042] Examples, such as Figure 1-Figure 11As shown, a feed tooth height adjustment mechanism comprises: a tooth lifting shaft 1, a tooth lifting fork-type crank 2, a tooth frame 5, a tooth lifting driving crank 7, an eccentric pin 9, an adjusting knob 13, a locking assembly, a feed shaft 27 and a feed crank 28; wherein, the tooth lifting shaft 1 and the feed shaft 27 are arranged in parallel, one end of the tooth lifting fork-type crank 2 is sleeved on the tooth lifting shaft 1, and the other end of the tooth lifting fork-type crank 2 can rotate in a circle around the axis of the tooth lifting shaft 1, and a first slide groove 3 and a second slide groove 4 are formed at the other end of the tooth lifting fork-type crank 2; the feed crank 28 is installed on the feed shaft 27, the tooth frame 5 is arranged between the tooth lifting shaft 1 and the feed shaft 27, and a first slider 6 is installed at one end of the tooth frame 5, the first slider 6 is slidably connected in the first slide groove 3, and the other end of the tooth frame 5 is connected to the feed crank 28.

[0043] The tooth lifting driving crank 7 is installed on one side of the tooth lifting fork-shaped crank 2, and one end of the tooth lifting driving crank 7 is fixedly connected to the tooth lifting shaft 1, and the other end of the tooth lifting driving crank 7 is formed with a connecting hole 8; the eccentric pin 9 includes a concentric segment 10 and an eccentric segment 11 that are axially fixedly connected, and the concentric segment 10 is rotatably coaxially installed in the connecting hole 8, and a second slider 12 is installed on the eccentric segment 11, and the second slider 12 is slidably connected in the second slide groove 4.

[0044] The adjusting knob 13 is installed on the side of the tooth lifting driving crank 7 away from the tooth lifting fork crank 2, and the adjusting knob 13 is fixedly connected to the concentric section 10, and is used to drive the eccentric pin 9 to rotate in a circular direction; the locking assembly is installed between the adjusting knob 13 and the tooth lifting driving crank 7, and the locking assembly has an unlocking state and a locking state. When the locking assembly is in the unlocking state, the adjusting knob 13 and the tooth lifting driving crank 7 can rotate relative to each other in the circumferential direction of the eccentric pin 9; when the locking assembly is in the locking state, the adjusting knob 13 and the tooth lifting driving crank 7 are fixedly connected in the circumferential direction of the eccentric pin 9.

[0045] The present application adopts an indirect transmission method to rotationally connect the tooth-lifting fork-type crank 2 with the tooth-lifting shaft 1, and fix the tooth-lifting driving crank 7 on the tooth-lifting shaft 1, cooperate with the eccentric pin 9 passed through the tooth-lifting driving crank 7 and the second slider 12 slidably connected to the tooth-lifting fork-type crank 2, as well as the adjusting knob 13 installed on the eccentric pin 9 and the locking assembly installed between the adjusting knob 13 and the tooth-lifting driving crank 7, so that the tooth-lifting driving crank 7 can be transmitted and moved between the tooth-lifting shaft 1 and the tooth-lifting fork-type crank 2 to realize the tooth-lifting and feeding action. At the same time, the eccentric pin 9 is rotated by adjusting the knob 13, and the relative rotation of the eccentric pin 9 and the second slider 12 in the second slide groove 4 of the tooth-lifting fork-type crank 2 is cooperated to realize the relative movement of the tooth-lifting driving crank 7 and the tooth-lifting fork-type crank 2 in the circumferential direction of the tooth-lifting shaft 1, thereby realizing the convenient adjustment of the height of the feeding tooth 29, maintaining the continuity of the sewing operation, and improving the work efficiency.

[0046] Specific embodiment 1, as Figure 1-Figure 7 , Fig. 9 and Fig.10 As shown, a feed tooth height adjustment mechanism includes: a tooth lifting shaft 1, a tooth lifting fork-type crank 2, a tooth frame 5, a tooth lifting driving crank 7, an eccentric pin 9, an adjusting knob 13, a locking assembly, a feed shaft 27 and a feed crank 28; wherein, the tooth lifting shaft 1 and the feeding shaft 27 are arranged in parallel, the connecting end of the tooth lifting fork-type crank 2 is sleeved on the tooth lifting shaft 1, and the swinging end of the tooth lifting fork-type crank 2 can swing back and forth around the circumferential direction of the tooth lifting shaft 1, and a first slide groove 3 and a second slide groove 4 are formed at the swinging end of the tooth lifting fork-type crank 2, the first slide groove 3 is arranged above the second slide groove 4, and the first slide groove 3 and the second slide groove 4 are arranged in parallel.

[0047] One end of the feed crank 28 is sleeved on the feed shaft 27 and fixedly connected to the feed shaft 27 by a fastening bolt; the tooth frame 5 is arranged between the tooth lifting shaft 1 and the feed shaft 27, and a first slider 6 is installed at one end of the tooth frame 5, and the first slider 6 is slidably connected in the first slide groove 3, the other end of the tooth frame 5 is connected to the feed crank 28, and the feed tooth 29 is installed on the tooth frame 5.

[0048] The tooth lifting driving crank 7 is located on one axial side of the tooth lifting fork type crank 2, and the connecting end of the tooth lifting driving crank 7 is sleeved on the tooth lifting shaft 1 and fixedly connected to the tooth lifting shaft 1 by a fastening screw. A retaining ring 24 is also fixedly installed on the tooth lifting shaft 1. The retaining ring 24 is located on the other axial side of the tooth lifting fork type crank 2 and is used to axially limit the tooth lifting fork type crank 2; a connecting through hole 8 is formed at the swinging end of the tooth lifting driving crank 7, and the eccentric pin 9 includes a concentric segment 10 and an eccentric segment 11 that are axially fixedly connected. The concentric segment 10 and the eccentric segment 11 are fixedly connected. 1 are mutually eccentric, that is, the axis of the concentric segment 10 and the axis of the eccentric segment 11 are parallel but not colinear; the concentric segment 10 is rotatably coaxially installed in the connecting through hole 8, and the eccentric segment 11 is installed with a second slider 12, and the second slider 12 is slidably connected in the second slide groove 4, so as to drive the rotation of the eccentric pin 9 and cooperate with the relative rotation of the eccentric segment 11 and the second slider 12 to drive the tooth lifting fork type crank 2 to swing around the tooth lifting shaft 1, so as to realize the relative movement of the tooth lifting driving crank 7 and the tooth lifting fork type crank 2 in the circumferential direction of the tooth lifting shaft 1.

[0049] The eccentric pin 9 also includes a planar connecting section 23, which is fixedly connected to the end of the concentric section 10 away from the eccentric section 11. The adjusting knob 13 is a rectangular block. The adjusting knob 13 is located on the side of the tooth lifting drive crank 7 away from the tooth lifting fork-type crank 2, and the adjusting knob 13 is sleeved on the planar connecting section 23 and fixedly connected to the planar connecting section 23 by a fastening screw, so as to drive the eccentric pin 9 to rotate in a circle.

[0050] The locking assembly is installed between the adjusting knob 13 and the tooth lifting driving crank 7, and the locking assembly includes a static tooth 14, a dynamic tooth 15, a locking plate 17 and a compression spring 16. The static tooth 14 is distributed at the swing end of the tooth lifting driving crank 7 along the circumferential direction of the connecting through hole 8. The locking plate 17 includes a first plate body 19 perpendicular to the eccentric pin 9 and a second plate body 20 parallel to the eccentric pin 9. One end of the first plate body 19 is vertically fixedly connected to one end of the second plate body 20 so that the locking plate 17 is L-shaped as a whole; the dynamic tooth 15 is distributed at the other end of the first plate body 19 along the circumferential direction of the connecting through hole 8, and a through groove 21 is formed in the middle of the first plate body 19. The adjusting knob One end of 13 is penetrated into the through groove 21, and the adjusting knob 13 is slidably connected with the first plate body 19 along the radial direction of the connecting through hole 8, the second plate body 20 is located on one side of the adjusting knob 13, and the compression spring 16 is installed between the adjusting knob 13 and the second plate body 20 to drive the movable tooth 15 to approach the static tooth 14 and mesh with each other, so as to realize the automatic transformation of the locking assembly from the unlocked state to the locked state; when the locking assembly is in the unlocked state, the adjusting knob 13 and the tooth lifting drive crank 7 can rotate relative to each other in the circumferential direction of the eccentric pin 9; when the locking assembly is in the locked state, the adjusting knob 13 and the tooth lifting drive crank 7 are fixedly connected in the circumferential direction of the eccentric pin 9.

[0051] Specific embodiment 2, as Figure 1-Figure 6 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a feed tooth height adjustment mechanism includes: a tooth lifting shaft 1, a tooth lifting fork-type crank 2, a tooth frame 5, a tooth lifting driving crank 7, an eccentric pin 9, an adjusting knob 13, a locking assembly, a feed shaft 27 and a feed crank 28; wherein, the tooth lifting shaft 1 and the feeding shaft 27 are arranged in parallel, the connecting end of the tooth lifting fork-type crank 2 is sleeved on the tooth lifting shaft 1, and the swinging end of the tooth lifting fork-type crank 2 can swing back and forth around the circumferential direction of the tooth lifting shaft 1, and a first slide groove 3 and a second slide groove 4 are formed at the swinging end of the tooth lifting fork-type crank 2, the first slide groove 3 is arranged above the second slide groove 4 along the radial direction of the tooth lifting shaft 1, and the first slide groove 3 and the second slide groove 4 are arranged in parallel.

[0052] One end of the feed crank 28 is sleeved on the feed shaft 27 and fixedly connected to the feed shaft 27 by a fastening bolt; the tooth frame 5 is arranged between the tooth lifting shaft 1 and the feed shaft 27, and a first slider 6 is installed at one end of the tooth frame 5, and the first slider 6 is slidably connected in the first slide groove 3, the other end of the tooth frame 5 is connected to the feed crank 28, and the feed tooth 29 is installed on the tooth frame 5.

[0053] The tooth lifting driving crank 7 is located on one axial side of the tooth lifting fork type crank 2, and the connecting end of the tooth lifting driving crank 7 is sleeved on the tooth lifting shaft 1 and fixedly connected to the tooth lifting shaft 1 by a fastening screw, and a retaining ring 24 is also fixedly installed on the tooth lifting shaft 1, and the retaining ring 24 is located on the other axial side of the tooth lifting fork type crank 2, and is used to axially limit the tooth lifting fork type crank 2; a connecting through hole 8 is formed at the swinging end of the tooth lifting driving crank 7, and the connecting through hole 8 is coaxial with the tooth lifting shaft 1, and the eccentric pin 9 includes an external threaded section 22, a concentric section 10 and an eccentric section 11 and a planar connecting section 23 that are sequentially connected along the axial direction; the coaxial section 10 is rotatable Installed in the connecting through hole 8, the eccentric segment 11 is passed through the second slider 12, and the second slider 12 can rotate around the eccentric segment 11, the second slider 12 is slidably connected in the second slide groove 4, the external thread segment 22 passes through the second slider 12 and is threadedly connected to the nut 26, and a gasket 25 is installed between the nut 26 and the tooth-lifting fork-type crank 2, so as to drive the tooth-lifting fork-type crank 2 to swing around the tooth-lifting shaft 1 by cooperating with the relative rotation of the eccentric segment 11 and the second slider 12 through the rotation of the concentric segment 10 of the eccentric pin 9 in the connecting through hole 8, thereby realizing the relative movement of the tooth-lifting driving crank 7 and the tooth-lifting fork-type crank 2 in the circumferential direction of the tooth-lifting shaft 1.

[0054] The adjusting knob 13 is located on the side of the tooth lifting driving crank 7 away from the tooth lifting fork-shaped crank 2, and the adjusting knob 13 is sleeved on the planar connecting section 23 and fixedly connected to the planar connecting section 23 by a fastening screw, so as to drive the eccentric pin 9 to rotate in a circle.

[0055] The locking assembly is installed between the adjusting knob 13 and the tooth lifting driving crank 7, and the locking assembly includes a static tooth 14, a dynamic tooth 15, a locking plate 17 and a compression spring 16. The static tooth 14 is distributed on the end face of the tooth lifting driving crank 7 close to the adjusting knob 13 along the circumferential direction of the connecting through hole 8, and the dynamic tooth 15 is distributed on the end face of the locking plate 17 close to the tooth lifting driving crank 7 along the circumferential direction of the connecting through hole 8, and the static tooth 14 and the dynamic tooth 15 can mesh with each other; a rectangular through groove 21 is formed in the middle of the locking plate 17, and one end of the adjusting knob 13 is penetrated in the through groove. The adjusting knob 13 is in the groove 21, and the adjusting knob 13 is slidably connected with the locking plate 17 along the axial direction of the connecting through hole 8. The compression spring 16 is installed between the adjusting knob 13 and the locking plate 17 to drive the movable tooth 15 to approach the static tooth 14 and engage with each other, so as to realize the automatic transformation of the locking assembly from the unlocked state to the locked state; when the locking assembly is in the unlocked state, the adjusting knob 13 and the tooth lifting drive crank 7 can rotate relative to each other in the circumferential direction of the eccentric pin 9; when the locking assembly is in the locked state, the adjusting knob 13 and the tooth lifting drive crank 7 are fixedly connected in the circumferential direction of the eccentric pin 9.

[0056] Specific embodiment 3, as 1- Figure 7 , Fig. 9 and Fig.10As shown, a feed tooth height adjustment mechanism includes: a tooth lifting shaft 1, a tooth lifting fork-type crank 2, a tooth frame 5, a tooth lifting driving crank 7, an eccentric pin 9, an adjusting knob 13, a locking assembly, a feed shaft 27 and a feed crank 28; wherein, the tooth lifting shaft 1 and the feeding shaft 27 are arranged in parallel, the connecting end of the tooth lifting fork-type crank 2 is sleeved on the tooth lifting shaft 1, and the swinging end of the tooth lifting fork-type crank 2 can swing back and forth around the circumferential direction of the tooth lifting shaft 1, and a first slide groove 3 and a second slide groove 4 are formed at the swinging end of the tooth lifting fork-type crank 2, the first slide groove 3 is arranged above the second slide groove 4 along the radial direction of the tooth lifting shaft 1, and the first slide groove 3 and the second slide groove 4 are arranged in parallel.

[0057] One end of the feed crank 28 is sleeved on the feed shaft 27 and fixedly connected to the feed shaft 27 by a fastening bolt; the tooth frame 5 is arranged between the tooth lifting shaft 1 and the feed shaft 27, and a first slider 6 is installed at one end of the tooth frame 5, and the first slider 6 is slidably connected in the first slide groove 3, the other end of the tooth frame 5 is connected to the feed crank 28, and the feed tooth 29 is installed on the tooth frame 5.

[0058] The tooth-lifting driving crank 7 is located on one axial side of the tooth-lifting fork-type crank 2, and the connecting end of the tooth-lifting driving crank 7 is fixedly connected to the tooth-lifting shaft 1; a connecting through hole 8 is formed at the swinging end of the tooth-lifting driving crank 7, and the connecting through hole 8 is coaxial with the tooth-lifting shaft 1, and the eccentric pin 9 includes a concentric section 10 and an eccentric section 11 which are axially fixedly connected; the concentric section 10 is rotatably coaxially installed in the connecting through hole 8, and the eccentric section 11 is penetrated by the second slider 12, and the second slider 12 and the eccentric section 11 can rotate relative to each other, and the second slider 12 is slidably connected in the second slide groove 4, so as to drive the tooth-lifting fork-type crank 2 to swing around the tooth-lifting shaft 1 through the rotation of the concentric section 10 of the eccentric pin 9 in the connecting through hole 8, and the relative rotation of the eccentric section 11 and the second slider 12, so as to realize the relative movement of the tooth-lifting driving crank 7 and the tooth-lifting fork-type crank 2 in the circumferential direction of the tooth-lifting shaft 1.

[0059] The adjusting knob 13 is a reduction motor, which is located on the side of the tooth lifting driving crank 7 away from the tooth lifting fork-shaped crank 2, and the reduction motor is transmission-connected to one end of the concentric segment 10 for driving the eccentric pin 9 to rotate.

[0060] The locking assembly is installed between the reduction motor and the tooth lifting drive crank 7, and the locking assembly includes a static tooth 14, a dynamic tooth 15, a locking plate 17, a compression spring 16 and an electromagnet. The static tooth 14 is distributed at the swing end of the tooth lifting drive crank 7 along the circumferential direction of the connecting through hole 8. The locking plate 17 includes a first plate body 19 perpendicular to the eccentric pin 9 and a second plate body 20 parallel to the eccentric pin 9. One end of the first plate body 19 is vertically fixedly connected to one end of the second plate body 20 so that the locking plate 17 is L-shaped as a whole; the dynamic tooth 15 is distributed at the other end of the first plate body 19 along the circumferential direction of the connecting through hole 8, and a through groove 21 is formed in the middle of the first plate body 19. The reduction motor is inserted in the through groove 21, and one end of the reduction motor is connected to the through groove 21. The first plate body 19 is slidably connected along the radial direction of the connecting through hole 8, the second plate body 20 is located on one side of the reduction motor, and the compression spring 16 is installed between the reduction motor and the second plate body 20, so that the movable teeth 15 automatically approach the static teeth 14 and mesh with each other, and the electromagnet (not shown in the figure) is installed between the reduction motor and the second plate body 20, so that the movable teeth 15 automatically move away from the static teeth 14, thereby realizing the automatic switching of the locking assembly between the unlocked state and the locked state; when the locking assembly is in the unlocked state, the reduction motor and the tooth lifting drive crank 7 can rotate relative to each other in the circumferential direction of the eccentric pin 9; when the locking assembly is in the locked state, the reduction motor and the tooth lifting drive crank 7 are fixedly connected in the circumferential direction of the eccentric pin 9.

[0061] In other embodiments, the compression spring 16 and the electromagnet may also be replaced by an electric telescopic rod.

[0062] Embodiment, a sewing machine, the sewing machine comprises the above-mentioned feed dog height adjustment mechanism.

[0063] The working process of the feed dog height adjustment mechanism of the utility model is as follows:

[0064] When the height of the feed tooth 29 needs to be changed, the second plate body 20 of the locking plate 17 can be pressed with a finger. At this time, the compression spring 16 is compressed, and the first plate body 19 of the locking plate 17 slides relative to the adjusting knob 13, and the movable tooth 15 at the end of the first plate body 19 is separated from the static tooth 14 on the tooth lifting drive crank 7. The locking plate 17 is rotated to drive the adjusting knob 13 to rotate, and the eccentric pin 9 rotates with the adjusting knob 13. Since the concentric segment 10 of the eccentric pin 9 is coaxial with the connecting through hole 8 of the tooth lifting drive crank 7, the tooth lifting drive crank 7 is in a stationary state, and the eccentric segment 11 of the eccentric pin 9 drives the second slider 12 installed on the tooth lifting fork crank 2 to move up and down. The tooth lifting fork crank 2 and the tooth lifting driving crank 7 are moved relative to each other, and the tooth lifting fork crank 2 and the tooth lifting driving crank 7 are moved relative to each other. When the feeding tooth 29 is adjusted to a suitable height, the locking plate 17 is released. At this time, the second plate body 20 of the locking plate 17 drives the first plate body 19 and the adjusting knob 13 to slide relative to each other under the elastic force of the compression spring 16, and makes the movable tooth 15 at the end of the first plate body 19 close to the static tooth 14 on the tooth lifting driving crank 7 and mesh with each other. Since the tooth lifting driving crank 7 is fixedly mounted on the tooth lifting shaft 1, at this time, rotating the locking plate 17 changes the relative position of the tooth lifting fork crank 2 and the tooth lifting driving crank 7, and the tooth lifting driving crank 7 remains unchanged, thereby achieving the purpose of changing the tooth height.

[0065] When the machine is running, the main shaft drives the tooth lifting shaft 1 to rotate, the tooth lifting shaft 1 drives the tooth lifting driving crank 7 to rotate, the tooth lifting driving crank 7 drives the second slider 12 to move up and down, the second slider 12 drives the tooth lifting fork-type crank 2 to move up and down, and the tooth lifting fork-type crank 2 drives the tooth frame 5 and the feeding tooth 29 fixed thereon to move up and down.

[0066] Compared with the prior art, this application has at least the following technical effects:

[0067] The feed dog height adjustment mechanism in the present application does not need to be loosened with a screwdriver. The feed dog height can be adjusted by manually twisting the locking assembly. This not only avoids the trouble of tightening the screws, but also eliminates the need to confirm whether the screws are tightened, thereby preventing mistakes. It can also reduce maintenance costs and improve work efficiency.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A feed dog height adjustment mechanism, characterized in that: include: Tooth lifting axis (1); A tooth-lifting fork-shaped crank (2), one end of which is rotatably sleeved on the tooth-lifting shaft (1), and the other end of which is formed with a first slide groove (3) and a second slide groove (4); A tooth rack (5), one end of which is connected to a first sliding block (6), and the first sliding block (6) is slidably connected in the first sliding groove (3); A tooth lifting driving crank (7), wherein the tooth lifting driving crank (7) is arranged on one side of the tooth lifting fork-shaped crank (2), one end of the tooth lifting driving crank (7) is fixedly connected to the tooth lifting shaft (1), and the other end of the tooth lifting driving crank (7) is formed with a connecting through hole (8); An eccentric pin (9), the eccentric pin (9) comprising a concentric section (10) and an eccentric section (11), the concentric section (10) being rotatably and coaxially mounted in the connecting through hole (8), the eccentric section (11) being rotatably connected to a second slider (12), the second slider (12) being slidably connected in a second slide groove (4); An adjusting knob (13), wherein the adjusting knob (13) is fixedly connected to the concentric segment (10); A locking assembly is installed between an adjusting knob (13) and a tooth lifting driving crank (7), and the locking assembly has an unlocking state that allows the adjusting knob (13) and the tooth lifting driving crank (7) to rotate relative to each other in the circumferential direction of an eccentric pin (9), and a locking state that fixes the adjusting knob (13) and the tooth lifting driving crank (7) in the circumferential direction of the eccentric pin (9).

2. A feed dog height adjustment mechanism according to claim 1, characterized in that: The locking assembly comprises a stationary tooth (14), a movable tooth (15), a locking plate (17) and a telescopic member (18); the stationary tooth (14) is formed on a tooth-lifting driving crank (7); the movable tooth (15) is formed on a side of the locking plate (17) close to the tooth-lifting driving crank (7); the locking plate (17) is sleeved on the outside of an adjusting knob (13) and is slidably connected to the adjusting knob (13); the telescopic member (18) is installed between the locking plate (17) and the adjusting knob (13) so as to make the movable tooth (15) approach or move away from the stationary tooth (14).

3. A feed dog height adjustment mechanism according to claim 2, characterized in that: The stationary teeth (14) are distributed at the other end of the tooth lifting driving crank (7) along the circumferential direction of the connecting through hole (8); the locking plate (17) includes a first plate body (19) perpendicular to the eccentric pin (9) and a second plate body (20) parallel to the eccentric pin (9); the movable teeth (15) are distributed at one end of the first plate body (19) along the circumferential direction of the connecting through hole (8); the telescopic member (18) is installed between the adjusting knob (13) and the second plate body (20); the locking plate (17) is slidably connected to the adjusting knob (13) along the radial direction of the connecting through hole (8).

4. A feed dog height adjustment mechanism according to claim 2, characterized in that: The stationary teeth (14) are distributed on the end surface of the tooth-lifting driving crank (7) close to the adjusting knob (13) along the circumferential direction of the connecting through hole (8), and the movable teeth (15) are distributed on the end surface of the locking plate (17) close to the tooth-lifting driving crank (7) along the circumferential direction of the connecting through hole (8). The telescopic member (18) is installed between the adjusting knob (13) and the locking plate (17), and the locking plate (17) is slidably connected to the adjusting knob (13) along the axial direction of the connecting through hole (8).

5. A feed dog height adjustment mechanism according to claim 3 or 4, characterized in that: The telescopic member (18) is a compression spring (16).

6. A feed dog height adjustment mechanism according to claim 5, characterized in that: The adjusting knob (13) is a reduction motor drivingly connected to the eccentric pin (9), and an electromagnet for placing the locking assembly in an unlocked state is installed between the reduction motor and the locking plate (17).

7. A feed dog height adjustment mechanism according to claim 3 or 4, characterized in that: The telescopic member (18) is an electric telescopic rod, and the adjusting knob (13) is a reduction motor that is transmission-connected to the eccentric pin (9).

8. The feed dog height adjustment mechanism according to claim 1, characterized in that: The first slide groove (3) is arranged above the second slide groove (4), and the first slide groove (3) and the second slide groove (4) are arranged in parallel.

9. A feed dog height adjustment mechanism according to claim 1, characterized in that: One end of the eccentric section (11) away from the concentric section (10) is fixedly connected to an external thread section (22), and one end of the concentric section (10) away from the eccentric section (11) is fixedly connected to a planar connection section (23).

10. A sewing machine, characterized in that: The sewing machine comprises the feed dog height adjustment mechanism according to any one of claims 1 to 9.

Images