Differential mechanism of overedger

Abstract

The invention provides a differential mechanism of an overedger, and particularly relates to the technical field of sewing machines, a driving motor firstly rotates by a certain angle, and the cloth feeding amplitude of differential feed dogs is increased; the driving motor reversely retreats by the same angle, so that the differential feed dog is changed, the cloth feeding amplitude of the differential feed dog is kept through the action of the one-way clutch, the cloth feeding amplitude of the differential feed dog is continuously increased under the continuous rotation of the driving motor, and the cloth feeding amplitude of the differential feed dog is gradually increased under the action of the one-way clutch. And the differential feed dog always keeps a real-time feed amplitude value. According to the differential mechanism, accurate control over the cloth feeding amplitude is achieved through driving of the driving motor, the cloth feeding accuracy of differential adjustment is improved, meanwhile, differential cloth feeding amplitude adjustment can be directly triggered on the adjusting key on the operation panel, the operability of the overedger is improved, and high market value and popularization and use value are achieved.

Description

Technical Field

[0001] The present application provides a differential mechanism of an overlock sewing machine, and specifically relates to the technical field of sewing machines. Background Art

[0002] Overlock sewing machines are the main edge-locking equipment in the current sewing industry. In the actual sewing process, different sewing process configurations should be adopted for different sewing materials, that is, different sewing materials have different cloth feeding amplitudes during the sewing process, and the differential ratio also has different requirements. Existing overlock sewing machines require operators to manually adjust the differential, which often cannot be accurately positioned, and the differential mechanism structure is relatively complex. It is cumbersome for operators to manually adjust the differential cloth feeding amplitude, and it is extremely inconvenient to disassemble and repair. Summary of the invention

[0003] The present application is aimed at the defects of the above-mentioned overlock sewing machine that the cloth feeding amplitude cannot be accurately positioned and the structure is complicated, and a differential mechanism of the overlock sewing machine of the present application is proposed, the differential mechanism has a driving motor and a differential crank slider, the driving motor indirectly drives the differential crank slider, and is characterized in that a slide rod driving crank is fixed on the motor main shaft of the driving motor, the slide rod driving crank pushes the slide rod, and the slide rod pushes the one-way clutch, the one-way clutch is arranged on the differential driving crank, one end of the differential driving crank is hinged to the differential adjusting connecting rod, and the differential adjusting connecting rod is hinged to the differential adjusting crank, The differential adjustment crank is fixedly connected to the differential adjustment connecting shaft, and the other end of the differential adjustment connecting shaft is fixed with differential adjustment crank 2, and differential adjustment crank 2 is hinged to differential adjustment crank 3, and the other end of differential adjustment crank 3 is hinged to the differential crank slider, and a slide groove is provided on the differential tooth frame, and the differential crank slider can slide up and down freely in the slide groove, and the driving motor drives the slide rod to drive the crank and push the slide rod, and the slide rod pushes the one-way clutch, and the one-way clutch indirectly changes the feeding amplitude of the differential feed teeth; under the action of the one-way clutch, the differential feed teeth always maintain the real-time feeding amplitude value.

[0004] Preferably, the back-and-forth rotation of the drive motor is triggered by an adjustment key on the operation panel, and the adjustment key is a forward jog key. When the forward jog key is jogged, the drive motor is commanded to rotate forward by 0.1° to 5° and immediately reverse by 0.1° to 5°. That is, when the drive motor rotates back and forth within the range of 0.1° to 5°, the drive motor first rotates forward by an angle between 0.1° and 5°, and then immediately reverses by the same angle, thereby adjusting the feed amplitude of the differential feed dog once. As the drive motor continues to rotate back and forth, the feed amplitude of the differential feed dog is increased incrementally by small amplitudes.

[0005] Preferably, the one-way clutch indirectly changes the cloth feeding amplitude of the differential cloth feeding teeth, including increasing adjustment of the cloth feeding amplitude and / or decreasing adjustment of the cloth feeding amplitude.

[0006] Preferably, the fixed position of the slide rod driving crank is located at the end of the motor main shaft and on the side of the overlock machine. The slide rod driving crank has a supporting portion, and the supporting portion of the slide rod driving crank is against the slide rod, and the differential driving crank passes through both ends of the one-way clutch.

[0007] Preferably, the front end of the differential tooth frame is connected to a differential cloth feeding tooth frame, and the front end of the differential cloth feeding tooth frame is fixed with differential cloth feeding teeth.

[0008] Preferably, a torsion spring is arranged between the differential adjustment connecting shaft, the differential adjustment crank and the differential adjustment connecting rod.

[0009] Preferably, a differential sensing element is fixed to the other end of the differential drive crank, and the differential sensing element rotates as the differential drive crank rotates; and a sensor is fixed on the bracket and is used to sense the differential sensing element.

[0010] Preferably, in the differential mechanism, the differential adjustment of the overlock machine is set to be carried out within the differential adjustment area of ​​the drive motor, the starting position of the drive motor is set as the initial position, the end position of the drive motor is set as the end position, and running from the initial position to the end position and returning from the end position to the initial position is one round trip of the drive motor. One round trip of the drive motor realizes one feed amplitude adjustment of the differential feed dog, and the angle of one round trip of the drive motor determines the size of the feed amplitude adjustment of the differential feed dog.

[0011] Preferably, during the differential adjustment process, when the crank portion of the differential drive crank reaches the maximum value of the differential feed dog's cloth feeding amplitude, the spring installed between the one-way clutch and the bracket pushes the one-way clutch to quickly return to the initial position, thereby resetting the differential mechanism.

[0012] Preferably, the one-way clutch has an adjusting drive crank, a bearing sleeve, a one-way bearing 1 and a one-way bearing 1, and one-way bearing 1 and one-way bearing 1 are fixed on the shaft of the differential drive crank. One-way bearing 1 is installed in a forward rotation direction, and one-way bearing 1 is installed in a reverse rotation direction. One-way bearing 1 is located inside the adjusting drive crank, and one-way bearing 1 is located inside the bearing sleeve. The one-way clutch can rotate freely in one direction and will be locked in a non-rotation direction.

[0013] Preferably, the adjusting driving crank has a through hole, the slide rod passes through the through hole of the adjusting driving crank, and a pushing block is provided on the slide rod, which is used to push the adjusting driving crank when the crank pushes the slide rod under the drive of the driving motor.

[0014] Compared with the prior art, the beneficial effects of the present application are: the driving motor first rotates a certain angle to increase the cloth feeding amplitude of the differential feed dog; the driving motor retreats in the opposite direction by the same angle, so that the differential feed dog changes, and the cloth feeding amplitude of the differential feed dog is maintained by the action of the one-way clutch. As the driving motor continuously rotates back and forth, the cloth feeding amplitude of the differential feed dog continuously increases. The differential mechanism of the present application utilizes the driving motor to achieve precise control of the cloth feeding amplitude, thereby improving the cloth feeding accuracy of the differential adjustment. At the same time, the differential cloth feeding amplitude adjustment can be directly triggered by pressing the adjustment key on the operation panel, thereby improving the operability of the overlock sewing machine, and having a high market value and promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a differential mechanism of an overlock sewing machine of the present application;

[0016] Figure 2 It is an exploded diagram of a differential mechanism of an overlock sewing machine of the present application;

[0017] Figure 3 This is a structural diagram of a differential mechanism one-way clutch of an overlock sewing machine of the present application;

[0018] Figure 4 It is a schematic diagram of the differential drive crank structure and the differential adjustment connecting rod connection of the differential mechanism of an overlock sewing machine of the present application;

[0019] Figure 5 It is a schematic diagram of the differential adjustment angle of an overlock sewing machine of the present application.

[0020] The numbers referring to the components in the above drawings are as follows:

[0021] Driving motor 10, motor spindle 11, differential mechanism 20, slide rod driving crank 21, slide rod 22, push block 221, one-way clutch 23, adjusting driving crank 231, through hole 2311, bearing bushing 232, one-way bearing 1 233, one-way bearing 1 234, differential driving crank 24, crank portion 241, shaft portion 242, differential adjusting connecting rod 25, differential adjusting crank 26, differential adjusting connecting shaft 27, differential adjusting crank 2 28, differential adjusting crank 3 29, differential crank slider 30, differential tooth frame 31, differential feed tooth frame 32, differential feed tooth 321, torsion spring 33, differential sensing element 34, sensor 35, spring 36, bracket 37.

[0022] Differential adjustment area 1A, initial position 1A1, end position 1A2, back and forth rotation 2A. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-5The preferred embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention.

[0024] A sewing machine of the present application has a differential mechanism 20 and a control system. Under the control of the control system, the differential mechanism 20 is differentially adjusted to change the cloth feeding amplitude of sewing, so as to realize the programmed control of the cloth feeding amplitude adjustment of the sewing machine, thereby improving the operability of the sewing machine. The differential mechanism 20 has a driving motor 10, a slide rod driving crank 21, a slide rod 22, a one-way clutch 23, a differential driving crank 24, a differential adjustment connecting rod 25, a differential adjustment crank 26, a differential adjustment connecting shaft 27, a differential adjustment crank 28, a differential adjustment crank 3 29, a differential crank slider 30, a differential tooth frame 31, a differential cloth feeding tooth frame 32, a torsion spring 33, a differential induction member 34, an inductor 35 and a spring 36 and other components.

[0025] A slide rod driving crank 21 is fixed on the motor main shaft 11 of the above-mentioned driving motor 10, and the fixed position of the slide rod driving crank 21 is located at the end of the motor main shaft 11 and on the side of the overlock sewing machine. The slide rod driving crank 21 has a supporting portion, and the supporting portion of the slide rod driving crank 21 is against the slide rod 22. The driving motor 10 drives a certain angle to make the slide rod driving crank 21 push the slide rod 22, and the slide rod 22 then pushes the one-way clutch 23 to operate. The one-way clutch 23 is arranged on the differential driving crank 24, and the differential driving crank 24 passes through the two ends of the one-way clutch 23.

[0026] One end of the differential drive crank 24 is hinged to the differential adjustment link 25, the differential adjustment link 25 is hinged to the differential adjustment crank 26, the differential adjustment crank 26 is fixedly connected to the differential adjustment connecting shaft 27, a torsion spring 33 is arranged between the differential adjustment connecting shaft 27, the differential adjustment crank 26 and the differential adjustment link 25, the other end of the differential adjustment connecting shaft 27 is fixed with the differential adjustment crank 28, the differential adjustment crank 28 is hinged to the differential adjustment crank 3 29, the other end of the differential adjustment crank 3 29 is hinged to the differential crank slider 30, the differential tooth rack 31 is provided with a slide groove 311, the differential crank slider 30 can slide up and down freely in the slide groove 311, the front end of the differential tooth rack 31 is arranged and connected with the differential feed tooth rack 32, and the front end of the differential feed tooth rack 32 is fixed with the differential feed tooth 321. The driving motor 10 rotates to drive the slide rod driving crank 21 to push the slide rod 22, and the slide rod 22 further pushes the one-way clutch 23, and the one-way clutch 23 indirectly changes the cloth feeding amplitude of the differential cloth feeding teeth 321.

[0027] A differential sensing element 34 is fixed to the other end of the differential drive crank 24 , and the differential sensing element 34 rotates as the differential drive crank 24 rotates; a sensor 35 is fixed on a bracket 37 for sensing the differential sensing element 34 , so that the control system senses the initial position of the one-way clutch 23 .

[0028] In the differential mechanism 20, the differential adjustment of the overlock sewing machine is set to be carried out in the differential adjustment area 1A of the drive motor 10, the starting position of the drive motor 10 is set as the initial position 1A1, and the end position of the drive motor 10 is set as the end position 1A2. Running from the initial position 1A1 to the end position 1A2 and then returning from the end position 1A2 to the initial position 1A1 is one round-trip rotation 2A of the drive motor 10. One round-trip rotation of the drive motor 10 realizes one feed amplitude adjustment of the differential feed dog 331. The angle of one round-trip rotation of the drive motor 10 determines the size of the feed amplitude adjustment of the differential feed dog 331.

[0029] The initial position of the one-way clutch 23 is set to the lowest value of the differential feed dog feed amplitude, and the highest value of the differential feed dog feed amplitude is the end position of the one-way clutch 23. During the differential adjustment process, when the crank portion 241 of the differential drive crank 24 reaches the highest value of the differential feed dog feed amplitude, the spring 36 installed between the one-way clutch 23 and the bracket 37 can push the one-way clutch 23 to quickly return to the initial position, thereby resetting the differential mechanism 20, and the feed amplitude adjustment starts from the lowest value of the crank portion 241 of the differential drive crank 24.

[0030] The driving motor 10 is at the initial position 1A1. The driving motor 10 applies a thrust to the slide drive crank 21 with one round-trip rotation, that is, when the slide drive crank 21 is pushed, the driving motor 10 returns to the end position 1A2. Then, the slide drive crank 21 pushes the slide 22, and the slide 22 pushes the one-way clutch 23 located at the initial position to rotate, and the one-way clutch 23 drives the differential drive crank 24 to rotate a certain angle. The rotation of the differential drive crank 24 causes the following differential adjustment connecting rod 25, differential adjustment crank 26, differential adjustment connecting shaft 27, differential adjustment crank 28, differential adjustment crank 3 29, differential crank slider 30, differential tooth rack 31 to finally cause the differential feed tooth 321 fixed at the front end of the differential feed tooth rack 32 to move, thereby realizing the feed amplitude adjustment of the differential feed tooth 321 of the overlock sewing machine. As the drive motor 10 rotates back and forth continuously, the differential feed teeth 321 will move accordingly to generate a new sewing feed amplitude. When the feed amplitude is adjusted to the maximum value, the one-way clutch 23 quickly returns to the initial position, and the feed amplitude also returns to the minimum stitch length. At this time, the required stitch length can be readjusted.

[0031] The adjustment of the sewing cloth feed width is an incremental adjustment. As another solution, the present application can also realize the decremental adjustment of the cloth feed width. Figure 1 In the embodiment, the slide bar 22 is arranged on the upper part of the bracket 37, so that the slide bar drives the crank 21 to push the slide bar 22, and the slide bar 22 can also push the one-way clutch 23, so as to realize the decreasing adjustment of the feeding distance of the differential feeding teeth 321. The technical effect realized is the same as the increasing adjustment of the feeding amplitude, which will not be repeated.

[0032] Specifically, the one-way clutch 23 has an adjustment drive crank 231, a bearing bushing 232, a one-way bearing 233 and a one-way bearing 234. The one-way bearing 233 and the one-way bearing 234 are fixed on the shaft 242 of the differential drive crank 24. The one-way bearing 233 is installed in the forward rotation direction, and the one-way bearing 234 is installed in the reverse rotation direction. The one-way bearing 233 is located inside the adjustment drive crank 231, and the one-way bearing 234 is located inside the bearing bushing 232. The adjustment drive crank 231 has a through hole 2311, and the slide bar 22 passes through the through hole 2311 of the adjustment drive crank 231. The slide bar 22 is provided with a push block 221, and the push block 221 is used to push the adjustment drive crank 231 when the drive crank 21 pushes the slide bar 22 under the drive of the drive motor 10.

[0033] The one-way clutch 23 can rotate freely in one direction and will be locked in the non-rotating direction. Driven by the drive motor 10, the differential crank slider 30 will move up and down on the slide groove 311 of the differential tooth rack 31, and the differential tooth rack 31 will then produce a relative horizontal movement, thereby changing the cloth feeding amplitude of the differential cloth feeding tooth rack 32 and its differential cloth feeding teeth 321, thereby achieving the technical effect of using the drive motor 10 to change the cloth feeding amplitude.

[0034] The reciprocating rotation of the driving motor 10 is triggered by the adjustment key on the operation panel. The adjustment key is a forward jog key. When the forward jog key is jogged, the driving motor 10 is commanded to rotate forward by 0.1° to 5° and immediately reverse by 0.1° to 5°, that is, one reciprocating rotation of the driving motor 10 is within the range of 0.1° to 5°. The driving motor 10 first rotates forward by an angle between 0.1° and 5°, and then immediately reverses by the same angle, so that the cloth feeding amplitude of the differential feed dog 331 is adjusted once. When the driving motor 10 continuously rotates back and forth, the cloth feeding amplitude of the differential feed dog 331 changes incrementally. Similarly, under the action of the one-way clutch 24, the differential feed dog 331 always maintains a real-time adjustment amplitude.

[0035] The above is only one of the preferred implementation methods of the present application and is not intended to limit the present invention. The scope of the patent implementation of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made by using the shape, structure, and principle of the description and drawings of the present application, or directly or indirectly applied in other related technical fields; any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the patent protection scope of the present application.

Claims

1. A differential mechanism of an overlock sewing machine, the differential mechanism comprising a drive motor and a differential crank slider, the drive motor indirectly drives the differential crank slider, characterized in that: A slide rod driving crank is fixed on the motor main shaft of the driving motor, and the slide rod driving crank pushes the slide rod, and the slide rod pushes the one-way clutch. The one-way clutch is arranged on the differential driving crank, and one end of the differential driving crank is hinged to the differential adjusting connecting rod, and the differential adjusting connecting rod is hinged to the differential adjusting crank, and the differential adjusting crank is fixedly connected to the differential adjusting connecting shaft, and the other end of the differential adjusting connecting shaft is fixed with a differential adjusting crank 2, and the differential adjusting crank 2 is hinged to the differential adjusting crank 3, and the other end of the differential adjusting crank 3 is hinged to the differential crank slider, and a slide groove is provided on the differential tooth rack, and the differential crank slider can slide up and down freely in the slide groove, and the driving motor rotates and drives the slide rod driving crank and pushes the slide rod, and the slide rod pushes the one-way clutch again, and the one-way clutch indirectly changes the feeding amplitude of the differential feed teeth; under the action of the one-way clutch, the differential feed teeth always maintain the real-time feeding amplitude value.

2. The differential mechanism of an overlock sewing machine according to claim 10, characterized in that: The back-and-forth rotation of the drive motor is triggered by an adjustment key on the operation panel, and the adjustment key is a forward jog key. When the forward jog key is jogged, the drive motor is commanded to rotate forward by 0.1° to 5° and immediately reverse by 0.1° to 5°. That is, when the drive motor rotates back and forth within the range of 0.1° to 5°, the drive motor first rotates forward by a certain angle between 0.1° and 5°, and then immediately reverses by the same angle, thereby adjusting the feed amplitude of the differential feed dog once. As the drive motor continues to rotate back and forth, the feed amplitude of the differential feed dog is increased in small increments.

3. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: The one-way clutch indirectly changes the cloth feeding amplitude of the differential cloth feeding teeth, including increasing adjustment of the cloth feeding amplitude and / or decreasing adjustment of the cloth feeding amplitude.

4. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: The fixed position of the slide rod driving crank is located at the end of the motor main shaft and on the side of the overlock sewing machine. The slide rod driving crank has a supporting part, and the supporting part of the slide rod driving crank is against the slide rod. The differential driving crank passes through the two ends of the one-way clutch.

5. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: The front end of the differential tooth frame is connected with a differential cloth feeding tooth frame, and the front end of the differential cloth feeding tooth frame is fixed with differential cloth feeding teeth.

6. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: A torsion spring is arranged between the differential adjustment connecting shaft, the differential adjustment crank and the differential adjustment connecting rod.

7. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: A differential sensing element is fixed to the other end of the differential drive crank, and the differential sensing element rotates as the differential drive crank rotates; the sensor is fixed on the bracket and is used to sense the differential sensing element.

8. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: In the differential mechanism, the differential adjustment of the overlock sewing machine is set to be carried out within the differential adjustment area of ​​the driving motor, the starting position of the driving motor is set as the initial position, and the ending position of the driving motor is set as the ending position. Running from the initial position to the ending position and returning from the ending position to the initial position is one round-trip rotation of the driving motor. One round-trip rotation of the driving motor realizes one feed amplitude adjustment of the differential feed dog. The angle of one round-trip rotation of the driving motor determines the size of the feed amplitude adjustment of the differential feed dog.

9. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: During the differential adjustment process, when the crank portion of the differential drive crank reaches the maximum value of the differential feed dog's cloth feeding amplitude, the spring installed between the one-way clutch and the bracket pushes the one-way clutch to quickly return to the initial position, thereby resetting the differential mechanism.

10. The differential mechanism of an overlock sewing machine according to claim 1, characterized in that: The one-way clutch comprises an adjusting drive crank, a bearing sleeve, a one-way bearing 1 and a one-way bearing 1. The one-way bearing 1 and the one-way bearing 1 are fixed on the shaft of the differential drive crank. The one-way bearing 1 is installed in a forward rotation direction, and the one-way bearing 1 is installed in a reverse rotation direction. The one-way bearing 1 is located inside the adjusting drive crank, and the one-way bearing 1 is located inside the bearing sleeve. The one-way clutch can rotate freely in one direction and will be locked in a non-rotation direction.

11. The differential mechanism of an overlock sewing machine according to claim 10, characterized in that: The adjusting driving crank has a through hole, the slide rod passes through the through hole of the adjusting driving crank, and a pushing block is arranged on the slide rod, and the pushing block is used to push the adjusting driving crank when the crank pushes the slide rod under the drive of the driving motor.

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