Motor-driven multifunctional structure of a sewing machine

Abstract

The utility model relates to a motor drive multifunctional structure of overlock machine, including drive motor and its output shaft on the line cutting lift presser foot cam assembly. This structure realizes four big functions through single motor drive: line cutting sub - lever, line cutting big lever and line cutting connecting rod drive line cutting knife assembly through line cutting assembly; lift presser foot big lever, lift presser foot small lever drive presser foot assembly through lift presser foot assembly; differential ratio adjustment assembly drives differential slide through differential adjustment lever group; tooth height adjustment assembly drives tooth eccentric shaft through tooth adjustment lever. Innovatively adopt adjustment shaft cooperation one - way bearing to realize the parameterization adjustment of differential ratio and tooth height. This structure has high integration, and the operation is simple, and effectively reduces the labor intensity, improves production efficiency, especially suitable for small - batch rapid production clothing processing demand.

Description

Technical Field

[0001] This utility model relates to the field of overlock sewing machine technology, and more specifically, it relates to a multi-functional structure for motor drive of an overlock sewing machine. 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. CN116180336A, published on May 30, 2023, is entitled "An Automatic Presser Foot Lifting, Thread Trimming, and Differential Ratio Adjustment Mechanism for Overlock Sewing Machines". Although this application can achieve the adjustment of presser foot lifting, thread trimming, differential ratio, and tooth height through a stepper motor, its overall structure is complex and the production cost is high. Utility Model Content

[0004] This invention overcomes the shortcomings of existing overlock sewing machines, which have complex structures for adjusting differential ratio and presser foot height, resulting in high production costs. It provides a motor-driven multi-functional structure for overlock sewing machines that simultaneously performs four actions: thread cutting, presser foot lifting, and adjustment of differential ratio and presser foot height. This highly automated integration enables automatic thread cutting and presser foot lifting, effectively reducing operator workload and improving work efficiency. Furthermore, differential adjustment and presser foot height adjustment are accomplished through the same set of adjuster components, further simplifying the overall structure and reducing production costs.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a multi-functional motor-driven structure for an overlock sewing machine, comprising:

[0006] Drive motor and wire-cutting and pressure foot cam assembly fixed on the output shaft of drive motor;

[0007] The wire cutting component drives the wire cutting blade component to perform the wire cutting action;

[0008] Lift the presser foot assembly to drive the presser foot assembly to achieve the presser foot action;

[0009] The differential ratio adjustment component drives the differential slide bar to slide, thereby adjusting the differential ratio.

[0010] The tooth height adjustment component drives the tooth adjustment eccentric shaft to rotate, thereby achieving tooth height adjustment.

[0011] This application utilizes a single drive motor to simultaneously achieve four actions: thread cutting, presser foot lifting, differential ratio adjustment, and tooth height adjustment. This high degree of automation and integration enables automatic thread cutting and presser foot lifting, effectively reducing operator workload and improving efficiency. Furthermore, the parameterized adjustment of the differential ratio and tooth height allows for rapid and intelligent adjustment of equipment performance parameters during product switching, reducing the skill requirements for operators and effectively addressing market demands for small-batch, quick-turnaround operations, as well as labor shortages and recruitment difficulties in the garment industry.

[0012] Preferably, the wire cutting assembly includes a small wire cutting lever with one end cooperating with the wire cutting lifting pressure foot cam assembly, and the other end of the small wire cutting lever connected to a large wire cutting lever; one end of the large wire cutting lever is rotatably mounted on the frame, and the other end is connected to the wire cutting connecting rod; the end of the wire cutting connecting rod away from the large wire cutting lever is connected to the wire cutting drive rod, and the wire cutting drive rod is fixedly mounted on the wire cutting blade assembly.

[0013] With the above structure, the wire-cutting function can be achieved when the output shaft of the drive motor rotates counterclockwise.

[0014] Preferably, the end of the small wire-cutting lever is provided with a wire-cutting follower wheel, and the large wire-cutting lever is provided with a wire-cutting return spring. The wire-cutting return spring pushes the large wire-cutting lever to rotate, and the large wire-cutting lever drives the wire-cutting follower wheel on the small wire-cutting lever to abut against the wire-cutting lifting foot cam.

[0015] When the drive motor resets, the wire cutting mechanism is reset by the elastic force of the wire cutting reset spring.

[0016] Preferably, the presser foot lifting assembly includes a large presser foot lever with one end cooperating with the wire-cutting presser foot cam assembly, and the other end of the large presser foot lever is rotatably mounted on the frame. The two ends of the hook are fixedly connected to the large presser foot lever and the small presser foot lever, respectively. One end of the small presser foot lever is fixed to the presser foot limiting ring, the presser foot limiting ring is fixedly connected to the presser foot shaft, the presser foot shaft is connected to the presser foot arm, and the end of the presser foot arm is provided with a presser foot assembly.

[0017] With the above structure, when the output shaft of the drive motor 1 rotates counterclockwise, the function of lifting the pressure foot can be realized.

[0018] Preferably, the wire-cutting and pressing foot cam assembly is provided with an adjusting shaft, and an adjusting component is provided at the end of the adjusting shaft. The adjusting shaft rotates counterclockwise to drive the adjusting component to adjust the differential ratio, and the adjusting shaft rotates clockwise to drive the adjusting component to adjust the tooth height.

[0019] This application achieves differential adjustment and tooth height adjustment by adjusting the clockwise and counterclockwise rotation of the adjusting shaft, thereby enabling the adjusting assembly to rotate clockwise and counterclockwise. This eliminates the need for two separate drive mechanisms to perform two different functions, resulting in a simpler overall structure.

[0020] Preferably, the differential ratio adjustment assembly includes a first differential adjustment lever, a second differential adjustment lever, and a third differential adjustment lever connected in sequence; the end of the first differential adjustment lever abuts against the adjuster assembly; the first differential adjustment lever and the second differential adjustment lever are connected by a fixed shaft; the second differential adjustment lever and the third differential adjustment lever are connected by a differential adjustment link; the end of the third differential adjustment lever away from the second differential adjustment lever is connected to a fourth differential adjustment lever through a differential adjustment shaft, and the fourth differential adjustment lever is connected to a differential slide rod through a differential link.

[0021] With the above structure, differential adjustment can be achieved when the output shaft of drive motor 1 rotates counterclockwise.

[0022] Preferably, a differential follower wheel is provided at the end of the first differential adjusting lever away from the second differential adjusting lever; a differential return spring is provided on the first differential adjusting lever, and the differential return spring drives the first differential adjusting lever to rotate, so that the differential follower wheel can maintain a contact state with the regulator assembly.

[0023] The differential return spring ensures that the differential follower wheel remains in contact with the regulator assembly, thereby ensuring that the differential ratio adjustment assembly can operate accurately and efficiently.

[0024] Preferably, the tooth height adjustment component includes an adjusting rod with one end abutting against the adjuster component, and the other end of the adjusting rod connected to the adjusting eccentric shaft; the adjusting eccentric shaft is provided with an adjusting eccentric section, and the adjusting eccentric section is provided with an adjusting slider.

[0025] With the above structure, the tooth height can be adjusted when the drive motor rotates clockwise.

[0026] Preferably, the tooth adjusting rod is provided with a tooth adjusting return spring, which drives the tooth adjusting rod to rotate, so that the tooth adjusting follower wheel at the end of the tooth adjusting rod abuts against the adjuster assembly.

[0027] The tooth height adjustment spring ensures that the tooth height adjustment follower wheel abuts against the adjustment assembly, thereby ensuring that the tooth height adjustment assembly can achieve a timely and rapid response.

[0028] Preferably, the adjuster assembly includes a first pawl mounting seat fixed on the adjusting shaft, a first pawl being provided on the first pawl mounting seat, a first one-way bearing being provided on the frame, and a tooth height adjusting cam being fixedly provided on the inner ring of the first one-way bearing, the tooth height adjusting cam abutting against the tooth height adjusting assembly.

[0029] A second one-way bearing is installed on the frame. A differential ratio adjusting cam is fixedly installed on the inner ring of the second one-way bearing. The adjusting shaft passes through the first one-way bearing and the second one-way bearing and is fixedly connected to the second pawl mounting seat. A second pawl is installed on the second pawl mounting seat. The differential ratio adjusting cam abuts against the differential ratio adjusting component.

[0030] The above structure enables differential adjustment and tooth height adjustment when the adjusting shaft rotates clockwise or counterclockwise. This eliminates the need for two separate drive mechanisms to perform two different functions, resulting in a simpler overall structure.

[0031] Compared with the prior art, the beneficial effects of this utility model are:

[0032] (1) This application uses a single drive motor to simultaneously achieve four parameter actions: wire cutting, pressing foot lifting, differential ratio adjustment, and tooth height adjustment. It has a high degree of automation integration, realizes automatic wire cutting and pressing foot lifting, effectively reduces the labor intensity of operators, and improves work efficiency. At the same time, it realizes parameterized adjustment of differential ratio and tooth height, which can quickly respond to the intelligent adjustment of equipment performance parameters when switching between different products, and reduces the skill requirements of operators.

[0033] (2) This application achieves differential ratio adjustment, tooth height adjustment, presser foot lifting function and wire cutting function by rotating the output shaft of the drive motor. The adjustment shaft drives the adjuster assembly to work, and the clockwise and counterclockwise rotation of the adjuster assembly realizes differential adjustment and tooth height adjustment. Thus, two sets of drive mechanisms are not needed to achieve two different functions, and the overall structure can be more concise. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0035] Figure 2 This is a three-dimensional structural diagram of the present invention from another angle.

[0036] Figure 3 This is an exploded view of the regulator assembly of this utility model.

[0037] Figure 4 This is a three-dimensional structural diagram of the present invention when installed on the frame of an overlock sewing machine.

[0038] In the diagram: 1. Drive motor, 2. Motor bracket, 3. Large lever for lifting the pressure foot, 4. Pressure foot follower wheel, 5. Wire cutting lifting pressure foot cam assembly, 6. Wire cutting follower wheel, 7. Wire cutting small lever, 8. Pressure foot assembly, 9. Pressure foot arm, 10. Wire cutting knife assembly, 11. Pressure foot shaft, 12. Wire cutting drive lever, 13. Wire cutting connecting rod, 14. Large lever for cutting, 15. Wire cutting return spring, 16. Wire cutting lever mounting shaft, 17. Pressure foot lifting lever limit ring, 18. Pressure foot lifting small lever, 19. Hook, 20. Adjusting shaft, 21. Adjuster assembly, 21-1. Copper sleeve, 21-2. Adjuster bracket, 21-3. Shaft screw, 21-4. Pawl mounting seat, 21-5. Pawl return spring, 21-6. Pawl, 21-7. Tooth height adjustment. 21-8. First one-way bearing; 21-9. Second one-way bearing; 21-10. Differential ratio adjusting cam; 21-11. Pawl; 21-12. Pawl return spring; 21-13. Pawl mounting seat; 21-14. Shaft screw; 22. Tooth adjustment slider; 23. Tooth adjustment return spring; 24. Tooth adjustment rod; 25. Tooth adjustment follower wheel; 26. Second differential adjusting lever; 27. Differential follower wheel; 28. First differential adjusting lever; 29. ​​First differential adjusting lever return spring; 30. Fixed shaft; 31. Differential adjusting link; 32. Third differential adjusting lever; 33. Differential return torsion spring; 34. Differential adjusting shaft; 35. Fourth differential adjusting lever; 36. Differential link; 37. Tooth adjustment eccentric shaft; 38. Differential slider. Detailed Implementation

[0039] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0040] Example 1: Refer to Figures 1 to 4 As shown, a multi-functional motor-driven structure for an overlock sewing machine includes:

[0041] Drive motor 1 and wire-cutting and pressure foot cam assembly 5 fixed on the output shaft of drive motor 1;

[0042] The wire cutting component drives the wire cutting knife component 10 to perform the wire cutting action;

[0043] Lift the presser foot assembly to drive the presser foot assembly 8 to achieve the presser foot action;

[0044] The differential ratio adjustment component drives the differential slide bar 38 to slide, thereby adjusting the differential ratio.

[0045] The tooth height adjustment component drives the tooth adjustment eccentric shaft 37 to rotate, thereby achieving tooth height adjustment.

[0046] This application utilizes a single drive motor to simultaneously achieve four actions: thread cutting, presser foot lifting, differential ratio adjustment, and tooth height adjustment. This high degree of automation and integration enables automatic thread cutting and presser foot lifting, effectively reducing operator workload and improving efficiency. Furthermore, the parameterized adjustment of the differential ratio and tooth height allows for rapid and intelligent adjustment of equipment performance parameters during product switching, reducing the skill requirements for operators and effectively addressing market demands for small-batch, high-return operations, as well as labor shortages and recruitment difficulties in the garment industry.

[0047] In one embodiment, the wire cutting assembly includes a small wire cutting lever 7 with one end cooperating with the wire cutting lifting foot cam assembly 5, and the other end of the small wire cutting lever 7 is connected to the large wire cutting lever 14; one end of the large wire cutting lever 14 is rotatably mounted on the frame 2, and the other end is connected to the wire cutting connecting rod 13; the end of the wire cutting connecting rod 13 away from the large wire cutting lever 14 is connected to the wire cutting drive rod 12, and the wire cutting drive rod 12 is fixedly mounted on the wire cutting knife assembly 10.

[0048] The drive motor 1 is fixed to the back of the housing via the frame 2. The drive motor 1 rotates counterclockwise, driving the wire-cutting lifting foot cam assembly 5 fixed on its output shaft to rotate counterclockwise. The wire-cutting lifting foot cam assembly 5 pushes the wire-cutting follower wheel 6 fixed at the lower end of the wire-cutting small lever 7. The wire-cutting follower wheel 6 drives the wire-cutting small lever 7 fixed on the wire-cutting large lever 14 to move upward. The wire-cutting small lever 7 drives the wire-cutting large lever 14 to swing upward. The wire-cutting large lever 14 drives the wire-cutting drive lever 12 fixed on the wire-cutting knife assembly 10 to swing upward through the wire-cutting connecting rod 13 at its right end. The wire-cutting drive lever 12 drives the wire-cutting knife shaft of the wire-cutting knife assembly 10 to rotate, thereby realizing the wire-cutting action.

[0049] A wire-cutting follower wheel 6 is provided at the end of the small wire-cutting lever 7, and a wire-cutting return spring 15 is provided on the large wire-cutting lever 14. The wire-cutting return spring 15 pushes the large wire-cutting lever 14 to rotate, and the large wire-cutting lever 14 drives the wire-cutting follower wheel 6 on the small wire-cutting lever 7 to abut against the wire-cutting lifting pressure foot cam 5. Therefore, when the drive motor 1 resets, the wire-cutting mechanism is driven to reset under the elastic force of the wire-cutting return spring 15, preparing for the next operation.

[0050] In one embodiment, the presser foot lifting assembly includes a large presser foot lever 3 with one end cooperating with the wire cutting presser foot cam assembly 5, and the other end of the large presser foot lever 3 is rotatably mounted on the frame 2. The two ends of the hook 19 are fixedly connected to the large presser foot lever 3 and the small presser foot lever 18, respectively. One end of the small presser foot lever 18 is fixed on the presser foot limiting ring 17, the presser foot limiting ring 17 is fixedly connected to the presser foot shaft 11, the presser foot shaft 11 is connected to the presser foot arm 9, and the end of the presser foot arm 9 is provided with a presser foot assembly 8.

[0051] The drive motor 1 rotates clockwise, driving the wire-cutting and lifting foot cam assembly 5 fixed on its output shaft to rotate clockwise. The wire-cutting and lifting foot cam assembly 5 presses down on the lifting foot follower wheel 4 fixed on the lifting foot large lever 3. The lifting foot follower wheel 4 drives the lifting foot large lever 3 to swing downward. The large lever 3 drives the lifting foot small lever 18 installed on the pressing foot shaft 11 to swing downward through the hook 19. The lifting foot small lever 18 drives the lifting foot lever limit ring 17 fixed on the pressing foot shaft 11 to swing downward. The lifting foot lever limit ring 17 drives the pressing foot shaft 11 to rotate counterclockwise. The pressing foot shaft 11 drives the pressing foot arm 9 fixed at its right end to swing upward. The pressing foot arm 9 drives the pressing foot assembly 8 fixed at its front end to move upward, realizing the lifting foot action. The drive motor 1 resets, and the original lifting foot structure drives the lifting foot structure to reset.

[0052] In one embodiment, an adjustment shaft 20 is provided on the wire-cutting and pressing foot cam assembly 5, and an adjuster assembly 21 is provided at the end of the adjustment shaft 20. The adjustment shaft 20 rotates counterclockwise to drive the adjuster assembly 21 to adjust the differential ratio, and the adjustment shaft 20 rotates clockwise to drive the adjuster assembly 21 to adjust the tooth height.

[0053] This application achieves differential adjustment and tooth height adjustment by adjusting the clockwise and counterclockwise rotation of the adjusting shaft 20, thereby enabling the adjusting assembly 21 to rotate clockwise and counterclockwise. This eliminates the need for two separate drive mechanisms to perform two different functions, resulting in a simpler overall structure.

[0054] The adjuster assembly 21 in this embodiment specifically includes: a first pawl mounting seat 21-4 fixed on the adjusting shaft 20, a first pawl 21-6 provided on the first pawl mounting seat 21-4, a first one-way bearing 21-8 provided on the frame 2, and a tooth height adjusting cam 21-7 fixedly provided on the inner ring of the first one-way bearing 21-8, the tooth height adjusting cam 21-7 abutting against the tooth height adjusting assembly;

[0055] A second one-way bearing 21-9 is provided on the frame 2. A differential ratio adjusting cam 21-10 is fixedly provided on the inner ring of the second one-way bearing 21-9. The adjusting shaft 20 passes through the first one-way bearing 21-8 and the second one-way bearing 21-9 and is fixedly connected to the second pawl mounting seat 21-13. A second pawl 21-11 is provided on the second pawl mounting seat 21-13. The differential ratio adjusting cam 21-10 abuts against the differential ratio adjusting component.

[0056] The outer rings of the first one-way bearing 21-8 and the second one-way bearing 21-9 are both fixedly mounted on the adjuster bracket 21-2.

[0057] In one embodiment, the differential ratio adjustment assembly includes a first differential adjustment lever 28, a second differential adjustment lever 26, and a third differential adjustment lever 32 connected in sequence; the end of the first differential adjustment lever 28 abuts against the regulator assembly 21; the first differential adjustment lever 28 and the second differential adjustment lever 26 are connected by a fixed shaft 30; the second differential adjustment lever 26 and the third differential adjustment lever 32 are connected by a differential adjustment link 31; the end of the third differential adjustment lever 32 away from the second differential adjustment lever 26 is connected to a fourth differential adjustment lever 35 through a differential adjustment shaft 34, and the fourth differential adjustment lever 35 is connected to a differential slide bar 38 through a differential link 36.

[0058] A differential follower wheel 27 is provided at the end of the first differential adjusting lever 28 away from the second differential adjusting lever 26; a differential return spring 29 is provided on the first differential adjusting lever 28, and the differential return spring 29 drives the first differential adjusting lever 28 to rotate, so that the differential follower wheel 27 can maintain contact with the regulator assembly 21.

[0059] The drive motor 1 rotates counterclockwise, driving the wire-cutting and lifting foot cam assembly 5 fixed on its output shaft to rotate counterclockwise. The wire-cutting and lifting foot cam assembly 5 drives the adjusting shaft 20 to rotate counterclockwise. The adjusting shaft 20 drives the second pawl mounting seat 21-13 on its shaft to rotate counterclockwise. The second pawl mounting seat 21-13 drives the second pawl 21-11 mounted on it to rotate counterclockwise. The second pawl 21-11 drives the differential ratio adjusting cam 21-10 mounted on the second one-way bearing 21-9 to rotate counterclockwise. The differential ratio adjusting cam 21-10 presses down on the differential follower wheel 27 mounted on the first differential adjusting lever 28. The differential follower wheel 27 drives the differential follower wheel 27 fixed on the first differential adjusting lever 28 to rotate counterclockwise. The first differential adjusting lever 28 on the fixed shaft 30 swings downward, causing the fixed shaft 30 to rotate counterclockwise. The fixed shaft 30 then causes the second differential adjusting lever 26 fixed at its end to swing upward. The second differential adjusting lever 26, through the differential adjusting linkage 31, causes the third differential adjusting lever 32 fixed on the differential adjusting shaft 34 to swing upward. The third differential adjusting lever 32 causes the differential adjusting shaft 34 to rotate clockwise. The differential adjusting shaft 34 then causes the fourth differential adjusting lever 35 fixed at its end to swing upward. The fourth differential adjusting lever 35, through the differential linkage 36, causes the differential slide bar 38 to move upward, thereby adjusting the differential ratio. Based on the physical characteristics of one-way bearings, the inner ring of the second one-way bearing 21-9 can rotate freely counterclockwise. Clockwise rotation will drive the outer ring of the second one-way bearing 21-9 to rotate synchronously. Because the outer ring of the second one-way bearing 21-9 is fixed inside the adjuster bracket 21-2 and cannot rotate, the inner ring of the second one-way bearing 21-9 cannot rotate clockwise. Furthermore, the differential ratio adjusting cam 21-10, which is fixed to its inner ring, cannot rotate clockwise, thus fixing the differential ratio parameter. When the drive motor 1 rotates counterclockwise one revolution, it drives the differential ratio adjusting cam 21-10 to rotate counterclockwise one revolution, and the differential ratio returns to its initial state.

[0060] In one embodiment, the tooth height adjustment assembly includes an adjusting rod 24 with one end abutting against the adjuster assembly 21, and the other end of the adjusting rod 24 is connected to the adjusting eccentric shaft 37; the adjusting eccentric shaft 37 is provided with an adjusting eccentric section, and the adjusting eccentric section is provided with an adjusting slider 22.

[0061] A tooth-adjusting return spring 23 is provided on the tooth-adjusting rod 24. The tooth-adjusting return spring 23 drives the tooth-adjusting rod 24 to rotate, so that the tooth-adjusting follower wheel 25 at the end of the tooth-adjusting rod 24 abuts against the adjuster assembly 21. The tooth-adjusting return spring 23 can provide a continuous restoring force to the tooth-adjusting rod 24, so that the tooth-adjusting rod 24 can maintain the reset state under the action of the tooth-adjusting return spring 23, and the tooth-adjusting follower wheel 25 can maintain contact with the adjuster assembly 21, thereby ensuring the response speed of the entire structure.

[0062] The drive motor 1 rotates clockwise, driving the wire-cutting and lifting foot cam assembly 5 fixed on its output shaft to rotate clockwise. The wire-cutting and lifting foot cam assembly 5 drives the adjusting shaft 20 to rotate clockwise. The adjusting shaft 20 drives the first pawl mounting seat 21-4 on its shaft to rotate clockwise. The first pawl mounting seat 21-4 drives the first pawl 21-6 mounted on it to rotate counterclockwise. The first pawl 21-6 drives the tooth height adjusting cam 21-7 mounted on the first one-way bearing 21-8 to rotate clockwise. The tooth height adjusting cam 21-7 presses down the tooth adjusting follower wheel 25 mounted on the tooth adjusting rod 24. The tooth adjusting follower wheel 25 drives the tooth adjusting rod 24 mounted on the tooth adjusting eccentric shaft 37 to swing downward. The tooth adjusting rod 24 drives the tooth adjusting eccentric shaft 37 to rotate counterclockwise. The tooth adjusting eccentric shaft 37 drives the tooth adjusting slider 22 fixed on its eccentric shaft section to move downward, thereby driving the tooth height to rise and realizing tooth height adjustment. Based on the physical characteristics of one-way bearings, the inner ring of the first one-way bearing 21-8 can rotate freely clockwise. Counterclockwise rotation will cause the outer ring of the first one-way bearing 21-8 to rotate synchronously. Because the outer ring of the first one-way bearing 21-8 is fixed within the adjuster bracket 21-2 and cannot rotate, the inner ring of the first one-way bearing 21-8 cannot rotate counterclockwise. Furthermore, the tooth height adjusting cam 21-7, fixed to its inner ring, cannot rotate counterclockwise, thus fixing the tooth height. When the drive motor 1 rotates clockwise one revolution, it causes the tooth height adjusting cam 21-7 to rotate clockwise one revolution, restoring the tooth height to its initial state.

[0063] This application utilizes a single drive motor to simultaneously achieve four actions: wire cutting, presser foot lifting, differential ratio adjustment, and tooth height adjustment. This high degree of automation and integration enables automatic wire cutting and presser foot lifting, effectively reducing operator workload and improving work efficiency. Furthermore, the parameterized adjustment of the differential ratio and tooth height allows for rapid and intelligent adjustment of equipment performance parameters during product switching, reducing the skill requirements for operators.

[0064] This application achieves differential ratio adjustment, tooth height adjustment, presser foot lifting, and wire cutting functions by rotating the output shaft of the drive motor 1. Furthermore, the adjustment shaft 20 drives the adjuster assembly 21, which rotates clockwise and counterclockwise to achieve differential adjustment and tooth height adjustment. This eliminates the need for two separate drive mechanisms to perform two different functions, resulting in a simpler overall structure.

[0065] 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. A multi-functional structure driven by a motor for an overlock sewing machine, characterized in that, include: The drive motor and the wire-cutting and pressure-lifting cam assembly fixed on the output shaft of the drive motor; The wire cutting component drives the wire cutting blade component to perform the wire cutting action; Lift the presser foot assembly to drive the presser foot assembly and achieve the presser foot action; The differential ratio adjustment component drives the differential slide bar to slide, thereby adjusting the differential ratio. The tooth height adjustment component drives the tooth adjustment eccentric shaft to rotate, thereby achieving tooth height adjustment.

2. The multi-functional motor-driven structure of the overlock sewing machine according to claim 1, characterized in that, The wire cutting assembly includes a small wire cutting lever with one end cooperating with the wire cutting lifting pressure foot cam assembly, and the other end of the small wire cutting lever connected to a large wire cutting lever; one end of the large wire cutting lever is rotatably mounted on the frame, and the other end is connected to the wire cutting connecting rod; the end of the wire cutting connecting rod away from the large wire cutting lever is connected to the wire cutting drive rod, and the wire cutting drive rod is fixedly mounted on the wire cutting knife assembly.

3. The multi-functional motor-driven structure of the overlock sewing machine according to claim 2, characterized in that, The end of the small wire-cutting lever is equipped with a wire-cutting follower wheel, and the large wire-cutting lever is equipped with a wire-cutting return spring. The wire-cutting return spring pushes the large wire-cutting lever to rotate, and the large wire-cutting lever drives the wire-cutting follower wheel on the small wire-cutting lever to abut against the wire-cutting lifting foot cam.

4. The multi-functional motor-driven structure of the overlock sewing machine according to claim 1, characterized in that, The presser foot lifting assembly includes a large presser foot lever that engages with the wire-cutting presser foot cam assembly at one end, and the other end of the large presser foot lever is rotatably mounted on the frame. The two ends of the hook are fixedly connected to the large presser foot lever and the small presser foot lever, respectively. One end of the small presser foot lever is fixed to the presser foot limiting ring, which is fixedly connected to the presser foot shaft. The presser foot shaft is connected to the presser foot arm, and the end of the presser foot arm is equipped with a presser foot assembly.

5. The multi-functional motor-driven structure of the overlock sewing machine according to any one of claims 1 to 4, characterized in that, An adjustment shaft is provided on the wire-cutting and pressing foot cam assembly, and an adjuster assembly is provided at the end of the adjustment shaft. The adjustment shaft rotates counterclockwise to drive the adjuster assembly to adjust the differential ratio, and the adjustment shaft rotates clockwise to drive the adjuster assembly to adjust the tooth height.

6. The multi-functional motor-driven structure of the overlock sewing machine according to claim 5, characterized in that, The differential ratio adjustment assembly includes a first differential adjustment lever, a second differential adjustment lever, and a third differential adjustment lever connected in sequence; the end of the first differential adjustment lever abuts against the regulator assembly; the first differential adjustment lever and the second differential adjustment lever are connected by a fixed shaft; the second differential adjustment lever and the third differential adjustment lever are connected by a differential adjustment link; the end of the third differential adjustment lever away from the second differential adjustment lever is connected to a fourth differential adjustment lever through a differential adjustment shaft, and the fourth differential adjustment lever is connected to a differential slide rod through a differential link.

7. The multi-functional motor-driven structure of the overlock sewing machine according to claim 6, characterized in that, A differential follower wheel is provided at the end of the first differential adjusting lever away from the second differential adjusting lever; a differential return spring is provided on the first differential adjusting lever, and the differential return spring drives the first differential adjusting lever to rotate, so that the differential follower wheel can maintain contact with the regulator assembly.

8. The multi-functional motor-driven structure of the overlock sewing machine according to claim 5, characterized in that, The tooth height adjustment component includes an adjustment rod with one end abutting against the adjustment component, and the other end of the adjustment rod connected to the adjustment eccentric shaft; the adjustment eccentric shaft is provided with an adjustment eccentric section, and the adjustment eccentric section is provided with an adjustment slider.

9. The multi-functional motor-driven structure of the overlock sewing machine according to claim 8, characterized in that, The tooth adjusting rod is equipped with a tooth adjusting return spring, which drives the tooth adjusting rod to rotate, so that the tooth adjusting follower wheel at the end of the tooth adjusting rod abuts against the adjuster assembly.

10. The multi-functional motor-driven structure of the overlock sewing machine according to claim 5, characterized in that, The regulator assembly includes a first pawl mounting seat fixed on the adjusting shaft, a first pawl being provided on the first pawl mounting seat, a first one-way bearing being provided on the frame, and a tooth height adjusting cam being fixedly provided on the inner ring of the first one-way bearing, the tooth height adjusting cam abutting against the tooth height adjusting assembly. A second one-way bearing is installed on the frame. A differential ratio adjusting cam is fixedly installed on the inner ring of the second one-way bearing. The adjusting shaft passes through the first one-way bearing and the second one-way bearing and is fixedly connected to the second pawl mounting seat. A second pawl is installed on the second pawl mounting seat. The differential ratio adjusting cam abuts against the differential ratio adjusting component.

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