A kind of regulation structure of cutting thread, lifting presser foot, adjusting differential ratio and tooth height

Abstract

The utility model discloses a kind of line cutting, lift presser foot, adjust the adjusting structure of differential ratio and tooth height, belong to sewing machine technical field.The structure includes cam and driving gear on the output shaft of driving motor, and the clockwise and counterclockwise rotation of cam respectively drives line cutting transmission assembly and lift presser foot transmission assembly work, simultaneously, the clockwise and counterclockwise rotation of driving gear respectively drives differential ratio adjusting assembly and tooth height adjusting assembly work.Adopt the structure design of one-way bearing cooperation cam, the one-way adjustment of parameter and self-locking fixation are realized.The utility model is driven by single motor, realizes the integrated control of four functions of line cutting, lift presser foot, differential ratio adjustment and tooth height adjustment in output shaft specific rotation angle interval, with compact structure, adjusting accurate, high degree of automation and the advantages such as, effectively reduce operation difficulty and labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and more specifically, it relates to an adjustment structure for cutting thread, raising presser foot, adjusting differential ratio, and adjusting tooth height. Background Technology

[0002] Overlock machines are currently the primary overlock sewing equipment in the sewing industry. In actual sewing processes, frequent thread trimming and presser foot raising are required. Using cylinders or manual foot pedals for operation is inefficient, and different sewing processes require different configurations for different fabrics. This means that different fabrics have different feed rates, differential ratios, and tooth height requirements. Existing overlock machines require operators to manually adjust the differential ratio and tooth height, which often results in inaccurate positioning. Furthermore, the adjustment mechanisms are complex, demanding high operator skills, and disassembly and maintenance are extremely inconvenient.

[0003] Chinese Patent Publication No. CN106012337A, published on October 12, 2016, entitled "Stitch Pitch and Differential Adjustment Mechanism and Sewing Machine". This application discloses a stitch pitch and differential adjustment structure, which mainly achieves the adjustment of stitch pitch and differential ratio through manual operation of a first manual adjustment structure and a second manual adjustment structure. The above-mentioned adjustment structure is relatively complex and requires high skill from the operator. Utility Model Content

[0004] This invention overcomes the problems of existing overlock sewing machines, which require operators to manually adjust the differential ratio and presser foot height, making precise positioning difficult and the adjustment structure complex. It provides an adjustment structure for thread cutting, presser foot lifting, and differential ratio and presser foot height adjustment. Driven by a single motor, it simultaneously performs four parameter actions: thread cutting, presser foot lifting, and differential ratio and presser foot height adjustment. This highly automated integration enables automatic thread cutting and presser foot lifting, effectively reducing operator workload and improving work efficiency. Furthermore, it allows for parameterized adjustment of the differential ratio and presser foot height, enabling intelligent adjustment of equipment performance parameters during product switching and reducing the skill requirements for operators.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: an adjustment structure for cutting thread, raising the presser foot, adjusting the differential ratio and tooth height, comprising:

[0006] A cam and a drive bevel gear mounted on the output shaft;

[0007] The wire-cutting drive assembly and the presser foot lifting drive assembly are driven by cams rotating clockwise and counterclockwise, respectively.

[0008] The differential ratio adjustment component and the tooth height adjustment component are driven by the clockwise and counterclockwise rotation of the active bevel gear.

[0009] This application uses an output shaft to drive a cam and a drive bevel gear to rotate, thereby simultaneously driving the differential ratio adjustment component, the tooth height adjustment component, the wire cutting transmission component, and the presser foot lifting transmission component; thus achieving the function of "one driving four". Within a specific rotation angle range of the output shaft, four different functions and requirements are realized.

[0010] Preferably, the wire cutting transmission assembly includes a large wire cutting lever rotatably mounted on the frame; one end of the large wire cutting lever is fixedly provided with a first follower wheel that cooperates with a cam, and the other end of the large wire cutting lever is rotatably connected to a wire cutting connecting rod; the end of the wire cutting connecting rod away from the large wire cutting lever is connected to a small wire cutting lever, and the small wire cutting lever is connected to a wire cutting knife.

[0011] The drive motor rotates clockwise, causing the cam mounted on the output shaft of the drive motor to rotate clockwise. The cam presses down on the first follower wheel mounted on the left end of the large wire-cutting lever, causing the left end of the large wire-cutting lever to move downward and the right end to move upward. The right end of the large wire-cutting lever is connected to the small wire-cutting lever fixed on the wire-cutting knife assembly through the wire-cutting connecting rod. The upward movement of the right end of the large wire-cutting lever causes the small wire-cutting lever to rotate clockwise, which in turn causes the wire-cutting knife to rotate clockwise, thus realizing the wire-cutting action.

[0012] Preferably, the presser foot lifting transmission assembly includes a large wire-cutting lever, a hook, and a presser foot shaft rotatably mounted on the frame; one end of the large wire-cutting lever is rotatably mounted on the frame, and the other end is fixedly mounted with a second follower wheel that cooperates with a cam; the large presser foot lifting lever is connected to the small presser foot lifting lever via the hook, and the end of the small presser foot lifting lever away from the hook is connected to the presser foot shaft; the end of the presser foot shaft away from the small presser foot lifting lever is connected to the presser foot arm, and the end of the presser foot arm is provided with a presser foot assembly.

[0013] The drive motor rotates counterclockwise, causing the cam mounted on the output shaft of the drive motor to rotate counterclockwise. The cam presses down on the second follower wheel mounted on the left end of the large lever for lifting the presser foot, causing the large lever to swing downward. The large lever, through a hook, causes the small lever mounted on the presser foot shaft to swing downward. The small lever causes the presser foot limiting ring fixed on the left end of the presser foot shaft to swing downward. The limiting ring causes the presser foot shaft to rotate counterclockwise. The presser foot shaft causes the presser foot arm fixed on its right end to swing upward. The presser foot arm causes the presser foot assembly fixed at its front end to move upward, thus realizing the presser foot lifting action.

[0014] Preferably, it also includes an active feeder, a differential feeder, and a main shaft; the active bevel gear meshes with the driven bevel gear, the driven bevel gear is fixedly mounted at one end of the adjusting shaft, and the other end of the adjusting shaft is provided with an adjusting cam for controlling the differential ratio adjusting component and the tooth height adjusting component; the adjusting shaft is perpendicular to the output shaft and parallel to the main shaft.

[0015] Setting the output shaft perpendicular to the main shaft and adjustment shaft allows for more flexible placement of the drive motor, resulting in a more compact overall structure.

[0016] Preferably, the differential ratio adjustment assembly includes a differential ratio adjuster that cooperates with the adjustment cam, a differential ratio adjustment lever that cooperates with the differential ratio adjuster, and a differential ratio connecting rod; the differential ratio adjustment lever is rotatably mounted on the frame, and a differential connecting rod is rotatably connected to the end of the differential ratio adjustment lever away from the differential ratio adjuster; a differential shaft is provided at the end of the differential connecting rod away from the differential ratio adjustment lever; the differential shaft is connected to the differential ratio drive lever; and the differential ratio drive lever is connected to the differential ratio connecting rod.

[0017] Through the transmission of the above structure, when the drive bevel gear fixed on its output shaft rotates clockwise, the drive bevel gear drives the driven bevel gear fixed on the left end of the adjustment shaft to rotate clockwise, the driven bevel gear drives the adjustment shaft to rotate clockwise, the adjustment shaft drives the adjustment cam fixed on its right end to rotate clockwise, and then through the differential ratio adjustment component, the differential ratio can be continuously adjusted.

[0018] Preferably, the differential feed frame is provided with a differential slide groove in the vertical direction, and a differential ratio adjusting slider is provided in the differential slide groove. The differential ratio connecting rod is connected to the differential ratio adjusting slider.

[0019] The differential ratio is continuously adjusted by controlling the position of the differential ratio adjusting slider within the differential groove through the differential ratio adjusting component.

[0020] Preferably, the differential ratio adjuster includes a first one-way bearing mounted on the frame and a differential ratio adjusting cam mounted on the inner ring of the first one-way bearing; a second one-way bearing is fixedly mounted inside the differential ratio adjusting cam, the outer ring of the second one-way bearing is mounted on the differential ratio adjusting cam, a fixed shaft is mounted on the inner ring of the second one-way bearing, and a differential ratio adjusting rod is fixedly mounted on the fixed shaft; a third follower wheel that cooperates with the adjusting cam is mounted at the end of the differential ratio adjusting rod away from the fixed shaft.

[0021] By using two one-way bearings, the reciprocating motion of one one-way bearing drives the circular motion of the other one-way bearing, enabling continuous adjustment of parameters. The reverse self-locking of the one-way bearings fixes the parameters.

[0022] Preferably, the tooth height adjustment assembly includes a tooth height adjuster that cooperates with an adjustment cam, an adjustment rod that cooperates with the tooth height adjuster, an end of the adjustment rod away from the tooth height adjuster that is connected to an adjustment eccentric shaft, an adjustment eccentric shaft section that is provided on the adjustment eccentric shaft section that is provided with an adjustment slider; the active feed frame and the differential feed frame are arranged in parallel, and both the active feed frame and the differential feed frame are provided with an opening slot, and the adjustment slider is disposed in the opening slot of both.

[0023] With the above structure, when the output shaft of the drive motor rotates counterclockwise, the tooth height can be adjusted through the tooth height adjustment component.

[0024] Preferably, the tooth height adjuster includes a third one-way bearing mounted on the frame and a tooth height adjusting cam mounted on the inner ring of the third one-way bearing; a fourth one-way bearing is fixedly mounted inside the tooth height adjusting cam, the outer ring of the fourth one-way bearing is mounted inside the tooth height adjusting cam, a tooth fixing shaft is mounted on the inner ring of the fourth one-way bearing, a tooth height adjusting rod is fixedly mounted on the tooth fixing shaft, and a fourth follower wheel that cooperates with the adjusting cam is mounted at the end of the tooth height adjusting rod away from the tooth fixing shaft.

[0025] By using two one-way bearings, the reciprocating motion of one one-way bearing drives the circular motion of the other one-way bearing, enabling continuous adjustment of parameters. The reverse self-locking of the one-way bearings fixes the parameters.

[0026] Preferably, the tooth adjusting rod is equipped with a tooth adjusting torsion spring, which drives the tooth adjusting rod to rotate, so that the fourth follower wheel at the end of the tooth adjusting rod abuts against the tooth height adjusting cam.

[0027] The above structure enables a stable transmission relationship to be formed between the pressure adjusting rod and the tooth height adjusting cam.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] (1) This application drives the cam and the active bevel gear to rotate through the output shaft, thereby simultaneously driving the differential ratio adjustment component, the tooth height adjustment component, the wire cutting transmission component and the presser foot lifting transmission component; thus realizing the function of "one driving four", and realizing four different functions and requirements within a specific rotation angle range of the output shaft.

[0030] (2) On the tooth height adjuster and differential ratio adjuster, the cooperation of two one-way bearings realizes the reciprocating motion of one one-way bearing, which drives the other one-way bearing to rotate, thereby realizing the continuous adjustment of parameters. The one-way bearing reverse self-locking realizes the fixation of parameters. Attached Figure Description

[0031] Figure 1This is a three-dimensional structural diagram of the wire-cutting transmission assembly and the presser foot lifting transmission assembly of this utility model.

[0032] Figure 2 This is a three-dimensional structural diagram of the differential ratio adjustment component and the tooth height adjustment component of this utility model.

[0033] Figure 3 This is an exploded structural diagram of the tooth height adjuster and differential ratio adjuster of this utility model.

[0034] Figure 4 This is a three-dimensional structural diagram of the present invention after being combined with the frame.

[0035] In the diagram: 1. Drive motor; 2. Cam; 3. Second follower wheel; 4. Large lever for lifting the presser foot; 5. First follower wheel; 6. Hook; 7. Large lever for cutting thread; 8. Thread cutting connecting rod; 9. Small lever for cutting thread; 10. Thread cutting knife assembly; 11. Presser foot assembly; 12. Presser foot arm; 13. Presser foot shaft; 14. Presser foot lifting limit ring; 15. Small lever for lifting the presser foot; 16. Driven bevel gear; 17. Driven bevel gear; 18. Retaining ring; 19. Adjusting shaft; 20. Frame; 21. Adjusting cam; 22. Differential ratio adjuster; 22-1. First one-way bearing; 22-2. Differential ratio adjusting cam; 22-3. Second one-way bearing; 22-4. Cam follower; 22-5. Differential ratio adjusting rod; 22-6. First torsion spring; 22-7. Fixed shaft; 23. 24. Differential ratio adjusting lever, 25. Gear cam follower, 26. Tooth adjustment torsion spring, 27. Tooth adjustment rod, 28. Tooth adjustment eccentric shaft, 29. Differential small connecting rod, 30. Differential ratio drive small lever, 31. Differential ratio reset torsion spring, 32. Differential shaft, 33. Differential ratio drive large lever, 34. Differential connecting rod, 35. Differential ratio adjusting slider, 36. Tooth adjustment slider, 37. Tooth height adjuster, 37-1. Third one-way bearing, 37-2. Tooth height adjusting cam, 37-3. Fourth one-way bearing, 37-4. Fourth follower wheel, 37-5. Tooth height adjusting rod, 37-6. Second torsion spring, 37-7. Tooth fixed shaft, 38. Active feed frame, 39. Differential feed frame, 39-1. Differential slide, 40. Main shaft. Detailed Implementation

[0036] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0037] Example 1: Refer to Figures 1 to 4 As shown, an adjustment structure for cutting thread, raising presser foot, adjusting differential ratio, and adjusting tooth height is characterized by comprising:

[0038] Cam 2 and drive bevel gear 16 are mounted on the output shaft;

[0039] The wire cutting drive assembly and the presser foot lifting drive assembly are driven by the clockwise and counterclockwise rotation of cam 2, respectively.

[0040] The differential ratio adjustment component and the tooth height adjustment component are driven by the clockwise and counterclockwise rotation of the active bevel gear 16.

[0041] This application uses the output shaft to drive the cam 2 and the active bevel gear 16 to rotate, thereby simultaneously driving the differential ratio adjustment component, the tooth height adjustment component, the wire cutting transmission component, and the presser foot lifting transmission component; thus achieving the function of "one driving four". Within a specific rotation angle range of the output shaft, four different functions and requirements are realized.

[0042] Specifically, in this embodiment, the main shaft is the output shaft of the drive motor 1.

[0043] In one embodiment, the wire cutting drive assembly includes a large wire cutting lever 7 rotatably mounted on the frame 20; one end of the large wire cutting lever 7 is fixedly mounted with a first follower wheel 5 that cooperates with the cam 2, and the other end of the large wire cutting lever 7 is rotatably connected to the wire cutting connecting rod 8; the end of the wire cutting connecting rod 8 away from the large wire cutting lever 7 is connected to the small wire cutting lever 9, and the small wire cutting lever 9 is connected to the wire cutting knife assembly 10.

[0044] During operation, the drive motor 1 rotates clockwise, causing the cam 2 mounted on the output shaft of the drive motor 1 to rotate clockwise. The cam 2 presses down on the first follower wheel 5 mounted on the left end of the large wire-cutting lever 7, causing the left end of the large wire-cutting lever 7 to move downward and the right end to move upward. The right end of the large wire-cutting lever 7 is connected to the small wire-cutting lever 9 fixed on the wire-cutting knife assembly 10 through the wire-cutting connecting rod 8. The upward movement of the right end of the large wire-cutting lever 7 causes the small wire-cutting lever 9 to rotate clockwise, which in turn causes the wire-cutting knife to rotate clockwise, thus realizing the wire-cutting action.

[0045] In one embodiment, the presser foot lifting transmission assembly includes a wire-cutting lever 7, a hook 6, and a presser foot shaft 13 rotatably mounted on the frame 20; one end of the wire-cutting lever 7 is rotatably mounted on the frame 20, and the other end is fixedly mounted with a second follower wheel 3 that cooperates with the cam 2; the presser foot lifting lever 4 is connected to the presser foot lifting lever 15 via the hook 6, and the end of the presser foot lifting lever 15 away from the hook 6 is connected to the presser foot shaft 13; the end of the presser foot shaft 13 away from the presser foot lifting lever 15 is connected to the presser foot arm 12, and the end of the presser foot arm 12 is provided with a presser foot assembly 11.

[0046] During operation, the drive motor 1 rotates counterclockwise, causing the cam 2 mounted on the output shaft of the drive motor 1 to rotate counterclockwise. The cam 2 presses down on the second follower wheel 3 mounted on the left end of the large lever 4 for lifting the presser foot, causing the large lever 4 to swing downward. The large lever 4 drives the small lever 15 mounted on the presser foot shaft 13 to swing downward via the hook 6. The small lever 15 drives the presser foot limiting ring 14 fixed on the left end of the presser foot shaft 13 to swing downward. The pressing foot limiting ring 14 drives the presser foot shaft 13 to rotate counterclockwise. The presser foot shaft 13 drives the presser foot arm 12 fixed on its right end to swing upward. The presser foot arm 12 drives the presser foot assembly 11 fixed at its front end to move upward, thus realizing the presser foot lifting action.

[0047] In one embodiment, the system further includes an active feed frame 38, a differential feed frame 39, and a main shaft 40. An active bevel gear 16 meshes with a driven bevel gear 17, which is fixedly mounted at one end of an adjusting shaft 19. The other end of the adjusting shaft 19 is equipped with an adjusting cam 21 that controls the differential ratio adjusting component and the tooth height adjusting component. The adjusting shaft 19 is perpendicular to the output shaft and parallel to the main shaft. In this embodiment, the output shaft is configured to be perpendicular to the main shaft and the adjusting shaft 19, allowing for more flexible arrangement of the drive motor 1's mounting position and resulting in a more compact overall structure.

[0048] In one embodiment, the differential ratio adjustment assembly includes a differential ratio adjuster 22 that cooperates with the adjusting cam 21, a differential ratio adjusting lever 24 that cooperates with the differential ratio adjuster 22, and a differential ratio connecting rod. The differential ratio adjusting lever 24 is rotatably mounted on the frame 20. A differential small connecting rod 29 is rotatably connected to the end of the differential ratio adjusting lever 24 away from the differential ratio adjuster 22. A differential shaft 32 is provided at the end of the differential small connecting rod 29 away from the differential ratio adjusting lever 24. The differential shaft 32 is connected to the differential ratio driving large lever 33, and the differential ratio driving large lever 33 is connected to the differential ratio connecting rod 34.

[0049] The differential ratio adjuster 22 in this embodiment includes a first one-way bearing 22-1 mounted on the frame 20, and a differential ratio adjusting cam 22-2 mounted on the inner ring of the first one-way bearing 22-1. The differential ratio adjusting cam 22-2 and the inner ring of the one-way bearing are circumferentially limited, preventing relative rotation and allowing only simultaneous rotation. A second one-way bearing 22-3 is fixedly mounted inside the differential ratio adjusting cam 22-2. The outer ring of the second one-way bearing 22-3 is mounted on the differential ratio adjusting cam 22-2, and is circumferentially limited, preventing relative rotation and allowing only simultaneous rotation. A fixed shaft 22-7 is mounted on the inner ring of the second one-way bearing 22-3. The inner ring of the second one-way bearing 22-3 and the fixed shaft 22-7 are circumferentially limited, preventing relative rotation and allowing only simultaneous rotation. A differential ratio adjusting rod 22-5 is fixedly installed on the fixed shaft 22-7; a third follower wheel 22-4 that cooperates with the adjusting cam 21 is provided at the end of the differential ratio adjusting rod 22-5 away from the fixed shaft 22-7.

[0050] A first torsion spring 22-6 is provided on the differential ratio adjusting rod 22-5 to keep the third follower wheel 22-4 in close contact with the adjusting cam 21. This allows the third follower wheel 22-4 to fit tightly against the outer surface of the adjusting cam 21.

[0051] The drive motor 1 rotates clockwise, driving the drive bevel gear 16 fixed on its output shaft to rotate clockwise. The drive bevel gear 16 drives the driven bevel gear 17 fixed on the left end of the adjusting shaft 19 to rotate clockwise. The driven bevel gear 17 drives the adjusting shaft 19 to rotate clockwise. The adjusting shaft 19 drives the adjusting cam 21 fixed on its right end to rotate clockwise. The clockwise rotation of the adjusting cam 21 presses down on the third follower wheel 22-4 on the differential ratio adjuster 22, causing it to swing downward. The third follower wheel 22-4 is fixed on the differential ratio adjusting rod 22-5. The downward swing of the third follower wheel 22-4 drives the differential ratio adjusting rod 22-5 fixed on the fixed shaft 22-7 to swing downward. The differential ratio adjusting rod 22-5 drives the fixed shaft 22-7 to move counterclockwise. The fixed shaft 22-7 drives the second one-way bearing 22-3, which is also fixed on the shaft, to rotate counterclockwise. According to the physical characteristics of one-way bearings, the inner ring of the second one-way bearing 22-3 rotates counterclockwise, causing the outer ring to rotate synchronously. When the inner ring rotates clockwise, it rotates freely while the outer ring remains stationary. The counterclockwise movement of the second one-way bearing 22-3 causes the differential ratio adjusting cam 22-2, which is fixed on its outer ring, to rotate counterclockwise. The differential ratio adjusting cam 22-2 is also fixed on the inner ring of the first one-way bearing 22-1. The outer ring of the first one-way bearing 22-1 is fixed on the frame 20 and cannot rotate. According to the physical characteristics of one-way bearings, the inner ring of the first one-way bearing 22-1 can rotate freely counterclockwise, and clockwise rotation will cause the outer ring to rotate. Because the outer ring is fixed, the first one-way bearing 22-1 cannot rotate clockwise. The differential ratio adjusting cam 22-2, which is fixed on the inner ring of the first one-way bearing 22-1, also cannot rotate clockwise, thus locking the differential ratio parameter. The differential ratio adjusting cam 22-2 rotates counterclockwise and presses down the cam follower 23 fixed at the left end of the differential ratio adjusting lever 24. The cam follower 23 drives the left end of the differential ratio adjusting lever 24 to move down and the right end to move up. The differential ratio adjusting lever 24 drives the differential ratio driving lever 30 fixed at the right end of the differential shaft 32 to swing upward through the differential small connecting rod 29 at the right end. The differential ratio driving lever 30 drives the differential shaft 32 to rotate clockwise. The differential shaft 32 drives the differential ratio driving lever 33 fixed at its left end to swing upward. The differential ratio driving lever 33 drives the differential ratio adjusting slider to move upward through the differential connecting rod 34 at the left end, thereby realizing the adjustment of the differential ratio parameter. The drive motor 1 performs a periodic reciprocating clockwise motion, which, through the drive bevel gear 16 and the driven bevel gear 17, drives the adjusting cam 21 to perform a periodic reciprocating counterclockwise motion. This further drives the differential ratio adjusting rod 22-5 to perform a periodic reciprocating counterclockwise motion, which in turn drives the differential ratio adjusting cam 22-2 to continuously move counterclockwise, thereby achieving continuous adjustment of the differential ratio. When the differential ratio adjusting cam 22-2 rotates counterclockwise for one revolution, the differential ratio returns to its initial state.

[0052] In one embodiment, the differential feed frame is provided with a differential slide groove 39-1 in the vertical direction, and a differential ratio adjusting slider 35 is provided in the differential slide groove. The differential ratio connecting rod 34 is connected to the differential ratio adjusting slider 35. The differential ratio is continuously adjusted by controlling the sliding position of the differential ratio adjusting slider 35 in the differential slide groove through the differential ratio adjusting component.

[0053] In one embodiment, the tooth height adjustment assembly includes a tooth height adjuster 37 that cooperates with an adjusting cam 21, and an adjusting rod 27 that cooperates with the tooth height adjuster 37. One end of the adjusting rod 27 away from the tooth height adjuster 37 is connected to an adjusting eccentric shaft 28. An adjusting eccentric shaft section is provided on the adjusting eccentric shaft section, and an adjusting slider 36 is provided on the adjusting eccentric shaft section. The active feed frame and the differential feed frame are arranged in parallel, and both the active feed frame and the differential feed frame are provided with opening slots. The adjusting slider 36 is disposed in the opening slots of both.

[0054] The tooth height adjuster 37 in this embodiment is similar in structure to the differential ratio adjuster 22, except that the tooth height adjuster 37 includes a third one-way bearing 37-1 mounted on the frame 20 and a tooth height adjusting cam 37-2 mounted on the inner ring of the third one-way bearing 37-1. The inner ring of the third one-way bearing 37-1 and the tooth height adjusting cam 37-2 are circumferentially limited, preventing relative rotation and allowing only simultaneous rotation. A fourth one-way bearing 37-3 is fixedly mounted inside the tooth height adjusting cam 37-2. The outer ring of the fourth one-way bearing 37-3 is mounted inside the tooth height adjusting cam 37-2, and is circumferentially limited, preventing relative rotation and allowing only simultaneous rotation. A tooth fixing shaft 37-7 is mounted on the inner ring of the fourth one-way bearing 37-3. The tooth fixing shaft 37-7 and the inner ring of the fourth one-way bearing 37-3 are circumferentially fixed, preventing relative rotation and allowing only simultaneous rotation. A tooth height adjusting rod 37-5 is fixedly installed on the tooth fixing shaft 37-7. A fourth follower wheel 37-4 that cooperates with the adjusting cam 21 is provided at the end of the tooth height adjusting rod 37-5 away from the tooth fixing shaft 37-7.

[0055] The drive motor 1 rotates counterclockwise, driving the active bevel gear 16 fixed on its output shaft to rotate counterclockwise. The active bevel gear 16 drives the driven bevel gear 17 fixed on the left end of the adjusting shaft 19 to rotate counterclockwise. The driven bevel gear 17 drives the adjusting shaft 19 to rotate counterclockwise. The adjusting shaft 19 drives the adjusting cam 21 fixed on its right end to rotate counterclockwise. The adjusting cam 21 rotates counterclockwise and pushes the fourth follower wheel 37-4 fixed on the tooth height adjuster 37 upward. The fourth follower wheel 37-4 swings upward, driving the tooth height adjusting rod 37-5 fixed on the tooth fixing shaft 37-7 to swing upward. The tooth height adjusting rod 37-5 drives the tooth fixing shaft 37-7 to move clockwise. The tooth fixing shaft 37-7 drives the fourth one-way bearing 37-3, which is also fixed on the shaft, to move clockwise. According to the one-way bearing... Due to its physical characteristics, the inner ring of the fourth one-way bearing 37-3 rotates clockwise, causing the outer ring to rotate synchronously. Counterclockwise, the inner ring rotates freely while the outer ring remains stationary. The clockwise movement of the fourth one-way bearing 37-3 causes the tooth height adjusting cam 37-2, fixed to its outer ring, to rotate clockwise. The tooth height adjusting cam 37-2 is also fixed to the inner ring of the third one-way bearing 37-1. The outer ring of the third one-way bearing 37-1 is fixed to the frame 20 and cannot rotate. Based on the physical characteristics of one-way bearings, the inner ring of the third one-way bearing 37-1 can rotate freely clockwise, and counterclockwise rotation will cause the outer ring to rotate. Because the outer ring is fixed, the third one-way bearing 37-1 cannot rotate counterclockwise. Similarly, the tooth height adjusting cam 37-2, fixed to the inner ring of the third one-way bearing 37-1, also cannot rotate counterclockwise, thus locking the tooth height parameter. The tooth height adjusting cam 37-2 rotates clockwise, pressing down the tooth cam follower 25 mounted on the lower end of the tooth adjusting rod 27. The tooth cam follower 25 drives the tooth adjusting rod 27, which is fixed on the tooth adjusting eccentric shaft 28, to swing to the right. The tooth adjusting rod 27 drives the tooth adjusting eccentric shaft 28 to move counterclockwise. The tooth adjusting eccentric shaft 28 drives the tooth adjusting slider 36 mounted on its eccentric shaft section to move downward, thereby raising the tooth height. The drive motor 1 performs a periodic reciprocating counterclockwise motion, which, through the drive bevel gear 16 and the driven bevel gear 17, drives the adjusting cam 21 to perform a periodic reciprocating clockwise motion. This further drives the tooth height adjusting rod 37-5 to perform a periodic reciprocating clockwise motion, causing the tooth height adjusting cam 37-2 to continuously move clockwise, thereby achieving continuous adjustment of the tooth height. After the tooth height adjusting cam 37-2 completes one clockwise rotation, the tooth height returns to its initial state.

[0056] The tooth adjusting rod 27 is equipped with a tooth adjusting torsion spring 26, which drives the tooth adjusting rod 27 to rotate, so that the fourth follower wheel at the end of the tooth adjusting rod 27 abuts against the tooth height adjusting cam 37-2.

[0057] A second torsion spring is provided on the tooth height adjusting rod 37-5. The second torsion spring drives the fourth follower wheel 37-4 on the tooth height adjusting rod 37-5 to abut against the surface of the adjusting cam 21.

[0058] In summary, this application drives the output shaft to rotate the cam 2 and the active bevel gear 16, thereby simultaneously driving the differential ratio adjustment component, the tooth height adjustment component, the wire cutting transmission component, and the presser foot lifting transmission component; thus achieving the function of "one driving four", realizing four different functions and requirements within a specific rotation angle range of the output shaft.

[0059] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An adjustment structure for cutting thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height, characterized in that, include: A cam and a drive bevel gear mounted on the output shaft; The wire-cutting drive assembly and the presser foot lifting drive assembly are driven by cams rotating clockwise and counterclockwise, respectively. The differential ratio adjustment component and the tooth height adjustment component are driven by the clockwise and counterclockwise rotation of the active bevel gear.

2. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 1, characterized in that, The wire cutting drive assembly includes a large wire cutting lever rotatably mounted on the frame; one end of the large wire cutting lever is fixedly equipped with a first follower wheel that cooperates with a cam, and the other end of the large wire cutting lever is rotatably connected to a wire cutting connecting rod; the end of the wire cutting connecting rod away from the large wire cutting lever is connected to a small wire cutting lever, and the small wire cutting lever is connected to a wire cutting knife.

3. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 1, characterized in that, The presser foot lifting transmission assembly includes a large wire-cutting lever, a hook, and a presser foot shaft rotatably mounted on the frame. One end of the large wire-cutting lever is rotatably mounted on the frame, and the other end is fixedly mounted with a second follower wheel that cooperates with a cam. The large presser foot lifting lever is connected to the small presser foot lifting lever via the hook, and the end of the small presser foot lifting lever away from the hook is connected to the presser foot shaft. The end of the presser foot shaft away from the small presser foot lifting lever is connected to the presser foot arm, and the end of the presser foot arm is equipped with a presser foot assembly.

4. The adjustment structure for trimming the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to any one of claims 1 to 3, characterized in that, It also includes an active feeder, a differential feeder, and a main shaft; the active bevel gear meshes with the driven bevel gear, the driven bevel gear is fixedly mounted at one end of the adjusting shaft, and the other end of the adjusting shaft is provided with an adjusting cam that controls the differential ratio adjusting component and the tooth height adjusting component; the adjusting shaft is perpendicular to the output shaft and parallel to the main shaft.

5. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 4, characterized in that, The differential ratio adjustment assembly includes a differential ratio adjuster that cooperates with the adjusting cam, a differential ratio adjusting lever that cooperates with the differential ratio adjuster, and a differential ratio connecting rod. The differential ratio adjusting lever is rotatably mounted on the frame. A differential connecting rod is rotatably connected to the end of the differential ratio adjusting lever away from the differential ratio adjuster. A differential shaft is provided at the end of the differential connecting rod away from the differential ratio adjusting lever. The differential shaft is connected to the differential ratio drive lever, and the differential ratio drive lever is connected to the differential ratio connecting rod.

6. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 5, is characterized in that, The differential fabric feeding frame is provided with a differential slide groove in the vertical direction, and a differential ratio adjusting slider is provided in the differential slide groove. The differential ratio connecting rod is connected to the differential ratio adjusting slider.

7. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 5, is characterized in that, The differential ratio adjuster includes a first one-way bearing mounted on the frame and a differential ratio adjusting cam mounted on the inner ring of the first one-way bearing. A second one-way bearing is fixedly mounted inside the differential ratio adjusting cam, and the outer ring of the second one-way bearing is mounted on the differential ratio adjusting cam. A fixed shaft is mounted on the inner ring of the second one-way bearing, and a differential ratio adjusting rod is fixedly mounted on the fixed shaft. A third follower wheel that cooperates with the adjusting cam is mounted on the end of the differential ratio adjusting rod away from the fixed shaft.

8. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 4, characterized in that, The tooth height adjustment assembly includes a tooth height adjuster that cooperates with an adjusting cam, an adjusting rod that cooperates with the tooth height adjuster, and an end of the adjusting rod away from the tooth height adjuster that is connected to an adjusting eccentric shaft. The adjusting eccentric shaft is provided with an adjusting eccentric shaft section, and an adjusting slider is provided on the adjusting eccentric shaft section. The active feed frame and the differential feed frame are arranged in parallel, and both the active feed frame and the differential feed frame are provided with an opening slot. The adjusting slider is located in the opening slot of both.

9. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 8, characterized in that, The tooth height adjuster includes a third one-way bearing mounted on the frame and a tooth height adjusting cam mounted on the inner ring of the third one-way bearing. A fourth one-way bearing is fixedly mounted inside the tooth height adjusting cam, with the outer ring of the fourth one-way bearing mounted inside the tooth height adjusting cam. A tooth fixing shaft is mounted on the inner ring of the fourth one-way bearing, and a tooth height adjusting rod is fixedly mounted on the tooth fixing shaft. A fourth follower wheel that cooperates with the adjusting cam is mounted at the end of the tooth height adjusting rod away from the tooth fixing shaft.

10. The adjustment structure for cutting the thread, raising the presser foot, adjusting the differential ratio, and adjusting the tooth height according to claim 9, characterized in that, The tooth adjusting rod is equipped with a tooth adjusting torsion spring, which drives the tooth adjusting rod to rotate, so that the fourth follower wheel at the end of the tooth adjusting rod abuts against the tooth height adjusting cam.

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