Thread cutting device with thread loosening mechanism

Abstract

The utility model discloses a kind of line cutting devices with line loosening mechanism, including driving mechanism, transmission mechanism, line cutting module and line loosening module, driving mechanism includes motor and the cam connected motor and driven by it;Transmission mechanism includes the line cutting transmission assembly and the line loosening transmission assembly respectively driven by cam, line cutting transmission assembly and line loosening transmission assembly are all pivotally connected in machine arm, and line cutting transmission assembly has moving piece, and line loosening transmission assembly has rotary arm;Line cutting module is set on base and has movable knife actuated by moving piece;Line loosening module is set in machine arm and has pull handle actuated by rotary arm, wherein driving mechanism and transmission mechanism are hidden in machine arm. By this, the overall transmission structure can be simplified, and then the use cost of material and element is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of a sewing machine, and more particularly to a thread cutting device with a thread loosening mechanism. Background Technology

[0002] Currently, regardless of the manufacturers producing sewing machines, the user demand is mostly met by adding or attaching extra mechanical structures or devices to the original machine. However, these structures or devices have never been properly planned and integrated with the internal structure of the sewing machine itself, resulting in additional costs on top of the original structural costs.

[0003] Furthermore, while the aforementioned additional structures or devices can temporarily meet the needs and provide assistance to sewing workers, few can maintain stable quality and cost under long-term environmental conditions. In addition to the vibrations, frictions, and interference from mechanical dead points generated when the sewing machine itself drives the structure through mechanical linkages, these factors will all be reflected in the sewing quality.

[0004] Furthermore, because additional structures or devices must be accommodated under the aforementioned conditions, the stability or functional expansion of these additional structures or devices will be reduced. In addition, the ease and number of adjustments to the mechanical components vary. In the market, new additional devices are generally installed on the original body as external accessories, resulting in the mechanical components being assembled piece by piece. As more functions are needed, additional parts are added, which is extremely unfriendly and inconvenient for operators and maintainers. Utility Model Content

[0005] The main objective of this invention is to provide a wire-cutting device with a wire-loosening mechanism, which simplifies the overall transmission structure and reduces the cost of materials and parts.

[0006] To achieve the above objectives, this utility model provides a thread-cutting device with a loosening mechanism for a sewing machine. The sewing machine has a machine arm and a base. The thread-cutting device with the loosening mechanism includes a drive mechanism, a transmission mechanism, a thread-cutting module, and a thread-loosening module. The drive mechanism includes an electric motor and a cam connected to and driven by the electric motor. The transmission mechanism includes a thread-cutting transmission component and a thread-loosening transmission component, both driven by the cam. Both the thread-cutting transmission component and the thread-loosening transmission component are pivotally connected to the machine arm. The wire tangent drive assembly includes a movable member, and the wire release drive assembly includes a rotating arm; the wire tangent module is disposed on the base and includes a movable blade actuated by the movable member; the wire release module is disposed on the machine arm and includes a pull handle actuated by the rotating arm; wherein the drive mechanism and the transmission mechanism are concealed within the machine arm; wherein when the electric motor drives the cam to rotate, it will drive the wire tangent drive assembly to cause the wire tangent module to tangle, and at the same time drive the wire release drive assembly to cause the wire release module to release the wire.

[0007] In some embodiments, the tangential drive assembly further includes a swing arm and a pivot, the swing arm being pivotally mounted to the arm via the pivot, and the two ends of the swing arm being connected to a cam and a moving part, respectively.

[0008] In some embodiments, the swing arm includes a bushing, a first fork arm, and a second fork arm. The first fork arm and the second fork arm are respectively fixed to both ends of the bushing. The bushing is pivotally connected to the bushing. The first fork arm is connected to a cam, and the second fork arm is connected to a moving part.

[0009] In some embodiments, the cam is connected to a pin, a first fork arm is sleeved on the pin, the moving part includes a shaft, and a second fork arm is sleeved on the shaft.

[0010] In some embodiments, the tangential drive assembly further includes a guide member having a guide groove, and a movable member is disposed in the guide groove and guided thereto.

[0011] In some embodiments, the movable component includes a sliding plate, a bearing seat connected to the sliding plate, and a shaft rod passing through the bearing seat. The sliding plate is provided with a guide groove, and the shaft rod is connected to the rocker arm.

[0012] In some embodiments, the cam includes a raised profile, and the wire release drive assembly further includes a driven arm and a rotating shaft. One end of the driven arm is connected to the rotating shaft and the other end is connected to a roller. The roller is attached to the raised profile. The rotating shaft is pivotally mounted on the machine arm. One end of the rotating arm is connected to the rotating shaft and the other end is connected to the wire release module.

[0013] In some embodiments, the rotating arm is connected to a column, and the wire loosening module further includes a fixed frame and at least two wire guides. The fixed frame is fixed to the arm, and the pull handle is movably connected to the fixed frame. The pull handle is provided with a fork that engages with the column. Each wire guide is fixed to the fixed frame at intervals. The pull handle is also provided with at least two abutting blocks, each abutting block being used to lift each wire guide to loosen the wire.

[0014] In some embodiments, the tangent module further includes a base plate, a fixed blade, a swing arm, and a return spring. The base plate is fixed on the base, the movable blade is disposed above the base plate and is configured corresponding to the moving part, the fixed blade is disposed at the end of the movable blade away from the moving part, one end of the swing arm is pivotally connected to the base plate and the other end is connected to the movable blade, and one end of the return spring is fixed to the other end of the base plate and elastically pushes against the swing arm.

[0015] In some embodiments, the cam includes a raised profile and a pin. The raised profile is formed on the radial circumferential surface of the cam, the pin is fixed on the end face of the cam, a tangential drive assembly is connected to the pin, and a tangential drive assembly is attached to the raised profile.

[0016] This invention also has the following advantages: During prolonged use, frictional wear inevitably occurs between components; this wear can be compensated for by adjusting the angle of the cam, further simplifying and enhancing maintenance. Furthermore, by concealing some mechanisms within the machine arm, the sewing machine's appearance becomes more streamlined and aesthetically pleasing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the thread-cutting device with a thread-loosening mechanism of this utility model applied to a sewing machine assembly.

[0018] Figure 2 This is an external view of the wire tangent device assembly with a loosening mechanism according to this utility model.

[0019] Figure 3 This is another perspective view of the combined appearance of the wire tangent device with a loosening mechanism of this utility model.

[0020] Figure 4 This is a top view of the tangent device with a loosening mechanism according to this utility model.

[0021] Figure 5 This is a front view of the tangent device with a loosening mechanism according to this utility model.

[0022] Figure 6 This is a diagram showing the usage state of the tangent device with a loosening mechanism according to this utility model (I).

[0023] Figure 7 This is a diagram showing the usage state of the tangent device with a loosening mechanism according to this utility model (II).

[0024] Figure 8This is diagram (III) showing the usage state of the tangent device with a loosening mechanism of this utility model.

[0025] Figure 9 This is diagram (four) showing the usage state of the tangent device with a loosening mechanism of this utility model.

[0026] Explanation of markings in the diagram: 10: Drive mechanism; 11: Electric motor; 12: Cam; 121: convex profile; 122: Pin; 20: Transmission mechanism; 21: Tangential drive assembly; 22: Swing arm; 221: Bushing; 222: First fork arm; 223: Second fork arm; 23: Moving parts; 231: Sliding plate; 232: Shaft seat; 233: Shaft; 24: Guiding components; 241: Guide groove; 25: Pivot; 26: Loose wire drive assembly; 27: Controlled boom; 271: Roller; 28: Shaft; 29: Rotary arm; 291: Column; 30: Tangent module; 31: Base plate; 32: Movable knife; 33: Fixed blade; 34: Swing arm; 35: Return spring; 40: Loose wire module; 41: Fixture; 42: Pull handle; 421: Fork in the road; 422: Top block; 43: Cable guide; 8: Sewing machine; 81: Machine arm; 82: Base. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0028] Please see Figures 1 to 5 As shown, this utility model provides a thread cutting device with a loosening mechanism for a sewing machine 8. The sewing machine 8 has a machine arm 81 and a base 82 connected below the machine arm 81. The thread cutting device with a loosening mechanism mainly includes a drive mechanism 10, a transmission mechanism 20, a thread cutting module 30 and a loosening module 40, wherein the drive mechanism 10 and the transmission mechanism 20 are concealed within the aforementioned machine arm 81.

[0029] The drive mechanism 10 mainly includes an electric motor 11 and a cam 12. The electric motor 11 can be a stepper motor or a servo motor. It is inserted and fixed in the arm 81 by machining a receiving hole (not shown in the figure). The cam 12 is connected to one side of the electric motor 11 and driven by the electric motor 11. In this embodiment, the cam 12 mainly includes a raised profile 121 and a pin 122. The raised profile 121 is formed on the radial circumferential surface of the cam 12, and the pin 122 is fixed on the end face of the cam 12.

[0030] The transmission mechanism 20 mainly includes a tangential transmission assembly 21 and a slack-wire transmission assembly 26. The tangential transmission assembly 21 is connected to and driven by the aforementioned cam 12. The tangential transmission assembly 21 mainly includes a swing fork arm 22, a moving member 23, a guide member 24 and a pivot 25. The swing fork arm 22 is pivotally mounted to the aforementioned arm 81 through the pivot 25. In this embodiment, the swing fork arm 22 mainly includes a bushing 221, a first fork arm 222 fixed to one end of the bushing 221 and a second fork arm 223 fixed to the other end of the bushing 221, wherein the first fork arm 222 is sleeved on the pin 122 of the aforementioned cam 12. The guide member 24 is disposed on the aforementioned base 82, and the guide member 24 is provided with a guide groove 241. The moving member 23 is disposed in the guide groove 241 and is guided by it to move back and forth. The moving member 23 mainly includes a sliding plate 231, a bearing seat 232 connected to one end of the sliding plate 231, and a shaft 233 passing through the bearing seat 232. The sliding plate 231 is embedded in the aforementioned guide groove 241, and the shaft 233 is sleeved on the aforementioned second fork arm 223.

[0031] The cable transmission assembly 26 is driven by the aforementioned cam 12, and mainly includes a driven arm 27, a rotating shaft 28 and a rotating arm 29. One end of the driven arm 27 is connected to the rotating shaft 28, and the other end of the driven arm 27 is connected to a roller 271. The roller 271 is attached to the raised profile 121 of the aforementioned cam 12. The rotating shaft 28 is pivotally mounted on the aforementioned arm 81. One end of the rotating arm 29 is connected to the rotating shaft 28, and the other end of the rotating arm 29 is connected to a column 291.

[0032] The tangent module 30 is mounted on the aforementioned base 82 and mainly includes a base plate 31, a movable blade 32, a fixed blade 33, a swing arm 34, and a return spring 35. The base plate 31 is fixed on the aforementioned base 82. The movable blade 32 is mounted above the base plate 31 and is configured corresponding to the aforementioned moving member 23. The movable blade 32 is actuated by the moving member 23. The fixed blade 33 is mounted at the end of the movable blade 32 away from the moving member 23. One end of the swing arm 34 is pivotally connected to the base plate 31, and the other end is connected to the movable blade 32. One end of the return spring 35 is fixed to the other end of the base plate 31 and elastically pushes against the swing arm 34. After the movable blade 32 is pushed out by the moving member 23, it returns to its original position through the combined action of the return spring 35 and the swing arm 34.

[0033] The loosening module 40 is installed on the aforementioned machine arm 81, and mainly includes a fixed frame 41, a pull handle 42, and a plurality of wire guides 43. The fixed frame 41 is fixed on the aforementioned machine arm 81, and the pull handle 42 is movably connected to the fixed frame 41. A fork 421 is provided in the middle area of ​​the pull handle 42, which corresponds to the aforementioned column 291. Each wire guide 43 is fixed at intervals on the fixed frame 41. Furthermore, a stop block 422 is provided at the bottom end of the pull handle 42 corresponding to each wire guide 43, so that when the fork 421 of the pull handle 42 is pushed by the column 291, each stop block 422 can push each wire guide 43 to loosen the wire.

[0034] Please see Figures 6 to 9As shown, when the sewing operation of the section is completed, when the starting motor 11 drives the cam 12 to rotate, the cam 12 rotates the first fork arm 222 through its pin 122, so that the swing fork arm 22 rotates around the pivot 25 as the rotation center, and pushes the shaft 233 of the moving part 23 with the second fork arm 223. The moving part 23 can move linearly relative to the guide 241 of the guide 24 through its sliding plate 231 embedded in the guide groove 241, and pushes the movable knife 32 to move out in the direction of the sewing thread. When the pin 122 reaches the top dead center position, the front end of the movable knife 32 moves out of the cutting edge of the fixed knife 33. After the cam 12 continues to rotate, the movable knife 32 will continue to move to each sewing thread and hook each sewing thread and pull it back to cut each sewing thread together with the fixed knife 33. Subsequently, the roller 271 of the driven arm 27 comes into contact with the raised profile 121 of the cam 12. As the cam 12 continues to rotate, the driven arm 27 will rotate around the rotating shaft 28 as the rotation center, and at the same time drive the rotating arm 29 to swing. The rotating arm 29 uses its column 291 to actuate the pull handle 42 to move relative to the fixed frame 41. The moving pull handle 42 will perform a lifting and loosening action by corresponding to each wire guide 43 through its abutment blocks 422.

[0035] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model, or reasonable combinations of features and solutions from various embodiments, are all within the protection scope of the present utility model.

Claims

1. A thread-cutting device with a thread-loosening mechanism for a sewing machine, the sewing machine having a machine arm and a base, characterized in that, The tangent device with a loosening mechanism includes: A drive mechanism includes an electric motor and a cam connected to and driven by the electric motor; A transmission mechanism includes a tangential drive assembly and a slack-line drive assembly, both driven by the cam. The tangential drive assembly and the slack-line drive assembly are pivotally connected to the machine arm. The tangential drive assembly includes a movable member, and the slack-line drive assembly includes a rotating arm. A tangent module, disposed on the base, includes a movable blade actuated by the moving member; and A wire release module is disposed on the machine arm, the wire release module including a pull handle actuated by the rotating arm; The drive mechanism and the transmission mechanism are concealed within the arm; When the motor drives the cam to rotate, it will drive the tangent transmission assembly to cause the tangent module to tangent, and at the same time drive the loosening transmission assembly to cause the loosening module to loosen the wire.

2. The tangent device with a loosening mechanism as described in claim 1, characterized in that, The tangential drive assembly further includes a swing fork arm and a pivot. The swing fork arm is pivotally mounted on the machine arm via the pivot, and the two ends of the swing fork arm are respectively connected to the cam and the moving part.

3. The tangent device with a loosening mechanism as described in claim 2, characterized in that, The swing arm includes a bushing, a first fork arm, and a second fork arm. The first fork arm and the second fork arm are respectively fixed at both ends of the bushing. The pivot passes through the bushing. The first fork arm is connected to the cam, and the second fork arm is connected to the moving part.

4. The tangent device with a loosening mechanism as described in claim 3, characterized in that, The cam is connected to a pin, the first fork arm is sleeved on the pin, the moving part includes a shaft, and the second fork arm is sleeved on the shaft.

5. The tangent device with a loosening mechanism as described in claim 2, characterized in that, The tangential drive assembly further includes a guide member, which has a guide groove, and the moving member is disposed in the guide groove and guided to move thereby.

6. The tangent device with a loosening mechanism as described in claim 5, characterized in that, The moving component includes a sliding plate, a bearing connected to the sliding plate, and a shaft passing through the bearing. The sliding plate is embedded in the guide groove, and the shaft is connected to the swing arm.

7. The tangent device with a loosening mechanism as described in claim 1, characterized in that, The cam includes a raised profile, and the wire release drive assembly also includes a driven arm and a rotating shaft. One end of the driven arm is connected to the rotating shaft and the other end is connected to a roller. The roller is attached to the raised profile. The rotating shaft is pivotally mounted on the machine arm. One end of the rotating arm is connected to the rotating shaft and the other end is connected to the wire release module.

8. The tangent device with a loosening mechanism as described in claim 7, characterized in that, The rotating arm is connected to a column. The wire loosening module also includes a fixed frame and at least two wire guides. The fixed frame is fixed to the arm. The pull handle is movably connected to the fixed frame. The pull handle has a fork that fits onto the column. Each wire guide is fixed to the fixed frame at intervals. The pull handle also has at least two abutting blocks. Each abutting block is used to lift each wire guide to loosen the wire.

9. The tangent device with a loosening mechanism as described in claim 1, characterized in that, The tangent module also includes a base plate, a fixed blade, a swing arm, and a return spring. The base plate is fixed on the base. The movable blade is disposed above the base plate and is configured corresponding to the moving part. The fixed blade is disposed at the end of the movable blade away from the moving part. One end of the swing arm is pivotally connected to the base plate, and the other end is connected to the movable blade. One end of the return spring is fixed to the other end of the base plate and elastically pushes against the swing arm.

10. The tangent device with a loosening mechanism as described in claim 1, characterized in that, The cam includes a raised profile and a pin. The raised profile is formed on the radial circumferential surface of the cam, and the pin is fixed on the end face of the cam. The tangential drive assembly is connected to the pin, and the loosening drive assembly is attached to the raised profile.

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