Automatic thread trimming mechanism for sewing machine

Abstract

The utility model discloses a sewing machine automatic thread cutting mechanism belongs to sewing machine technical field, including fixed base, is provided with thread cutting subassembly and drive assembly on the fixed base, the thread cutting subassembly includes thread cutting moving knife, is equipped with long circular groove on the thread cutting moving knife, the drive assembly includes thread cutting gear and eccentric arrangement drive block on the thread cutting gear, drive block slidingly connected in long circular groove. This scheme realizes thread cutting operation through thread cutting subassembly, realizes the drive of thread cutting subassembly through drive assembly, wherein, the drive block on drive assembly is arranged on thread cutting gear, when thread cutting gear rotates, the drive block on drive assembly can produce the sliding in long circular groove, drives thread cutting moving knife to realize swing, and then realizes the operation of thread cutting. The automatic thread cutting mechanism of this scheme can realize efficient automatic thread cutting, guarantees thread cutting quality simultaneously.

Description

Technical Field

[0001] This utility model relates to a thread-cutting structure, and more specifically, to an automatic thread-cutting mechanism for a sewing machine. Background Technology

[0002] Traditional sewing machines rely on manual thread trimming after each stitch. However, in large-scale production, this method requires workers to frequently trim the thread manually, significantly impacting sewing efficiency. Furthermore, manual thread trimming makes it difficult to ensure consistent thread length each time. If the thread length is inappropriate at the starting point of the stitch, problems such as unraveling, tangling, and skipped stitches may occur, affecting both sewing quality and efficiency.

[0003] For example, Chinese Patent Publication No. CN216998827U, published on July 19, 2022, discloses a utility model entitled "A Thread Cutting and Loosening Mechanism for a Sewing Machine and a Sewing Machine Having the Mechanism." This application discloses a thread cutting mechanism for a sewing machine, including a motor, a cam device, a thread loosening and cutting assembly, a thread loosening device, and a thread cutting device. The cam device is mounted on the motor shaft, and the thread cutting device is mounted on and connected to the thread loosening and cutting assembly and the machine base, respectively. The motor converts its rotational motion into the rotational oscillation of the thread loosening and cutting assembly through the cam device. The rotational oscillation of the thread loosening and cutting assembly drives the thread loosening device and the thread cutting device to simultaneously perform thread loosening and thread cutting actions. This solution features a cooperative design between the cam device and the thread loosening and cutting assembly, resulting in low processing costs, high transmission efficiency, and strong controllability. Furthermore, the connection position on the machine housing facilitates installation, connection, and subsequent disassembly and maintenance. However, in this solution, the limiting mechanism is built into the sewing machine, and the thread cutting effect is poor, making it difficult to guarantee effective thread cutting. Utility Model Content

[0004] This invention overcomes the problem of poor thread cutting effect in existing sewing machines and provides an automatic thread cutting mechanism for sewing machines. The design of this solution is simple and can automatically cut threads efficiently, improving the quality of thread cutting and sewing.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: an automatic thread-cutting mechanism for a sewing machine, including a fixed base, on which a thread-cutting assembly and a driving assembly are disposed. The thread-cutting assembly includes a thread-cutting blade with an elongated groove. The driving assembly includes a thread-cutting gear and a driving block eccentrically arranged on the thread-cutting gear, the driving block being slidably connected within the elongated groove. This solution achieves thread-cutting operation through the thread-cutting assembly and drives the thread-cutting assembly through the driving assembly. The driving block on the driving assembly is arranged on the thread-cutting gear. When the thread-cutting gear rotates, the driving block on the driving assembly can slide within the elongated groove, causing the thread-cutting blade to oscillate, thereby achieving the thread-cutting operation. This automatic thread-cutting mechanism can achieve efficient automatic thread cutting while ensuring thread-cutting quality.

[0006] Preferably, the wire cutting assembly further includes a fixed wire cutting blade hinged to the moving wire cutting blade. The fixed wire cutting blade is located on the side of the moving wire cutting blade closest to the fixed base, and is fixedly connected to the fixed base. The fixed wire cutting blade is a stationary structure, and the moving wire cutting blade is arranged on the side of the fixed wire cutting blade furthest from the fixed base, which facilitates the arrangement and operation of the moving wire cutting blade.

[0007] Preferably, a wire stop plate is provided on the opposite side of the fixed wire cutter and on the side of the movable wire cutter near the fixed base. The wire stop plate is flush with the surface of the fixed wire cutter. The wire stop plate can prevent the wire end from running out of the cutting nozzle and prevent the wire end from failing to be cut.

[0008] Preferably, a cutting notch is formed between the fixed wire-cutting blade and the movable wire-cutting blade, and a waste wire outlet is provided on the fixed base corresponding to the position of the cutting notch. The waste wire outlet at the cutting notch can collect the cut wire ends, preventing waste wire from scattering and accumulating and affecting the operation of the wire-cutting mechanism.

[0009] Preferably, the moving wire-cutting blade and the fixed wire-cutting blade are hinged together by a pivot screw, and an elastic element is provided on the pivot screw on the side of the moving wire-cutting blade away from the fixed wire-cutting blade. The connection between the moving and fixed wire-cutting blades by the pivot screw ensures effective rotation between them, and the elastic element allows adjustment of the compressive force between them, thereby regulating the shearing force and improving the wire-cutting quality.

[0010] Preferably, a mounting bracket is provided on the side of the fixing base where the wire-cutting assembly is located. A fixing frame is provided on the mounting bracket, and the wire-cutting gear is rotatably connected to the fixing frame near the wire-cutting assembly. The fixing frame on the mounting bracket can fix the position of the wire-cutting gear, ensuring that there is no interference between the wire-cutting assembly and the wire-cutting gear.

[0011] Preferably, one end of the drive block is an externally threaded rod threaded to the wire-cutting gear, and the other end of the drive block is a first bearing slidably connected to the elongated groove. The drive block is fixedly connected to the wire-cutting gear by the external thread, and the other end uses the first bearing to engage with the elongated groove on the wire-cutting blade to prevent the drive block from getting stuck in the elongated groove and being unable to perform the wire-cutting operation.

[0012] Preferably, a rotating shaft is provided on the axis of the wire-cutting gear, and the wire-cutting gear is rotatably connected to the fixed frame through the rotating shaft. The wire-cutting gear and the fixed frame are rotatably connected through the rotating shaft, so that the wire-cutting gear can rotate normally without interfering with the wire-cutting assembly.

[0013] Preferably, the drive assembly further includes a drive device, the output end of which is provided with a transmission gear that meshes with the wire-cutting gear. The drive device drives the wire-cutting gear to rotate via the transmission gear, thereby driving the wire-cutting blade to move and achieving automatic wire cutting.

[0014] Preferably, the mounting base has a housing on the side where the wire cutting assembly is located. The housing has a wire feeding groove corresponding to the wire cutting opening, and the edge of the wire feeding groove has several oblique teeth. The housing protects the wire cutting assembly and the drive assembly. The wire cutting opening on the housing prevents the wire end from being cut. The wire end can be initially stopped by the oblique teeth on the edge of the wire feeding groove, preventing inaccurate wire end positioning or affecting the wire cutting effect.

[0015] Compared with the prior art, the beneficial effects of this utility model are: (1) It can accurately control the position and length of the cutting, ensuring that the length of the cut thread ends is consistent each time, making the sewn fabric more beautiful and neat, and improving the sewing quality; (2) It avoids direct contact between the operator and the cutting blade, reducing the risk of injury to personnel due to operational errors; (3) The pre-tension force between the moving cutting blade and the fixed cutting blade is adjustable, improving the cutting quality; (4) The structure is compact and can realize automated cutting operation. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is the front view of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0019] Figure 4 This is a schematic diagram showing the cooperation between the internal drive component and the wire cutting component of this utility model.

[0020] Figure 5 This is a schematic diagram of the upper structure of the wire shearing gear of this utility model.

[0021] Figure 6 This is a schematic diagram of the layout of the wire-cutting assembly of this utility model.

[0022] In the diagram: 1. Fixed base, 2. Moving wire cutter, 3. Fixed wire cutter, 4. Long oval groove, 5. Drive block, 5.1. External threaded rod, 5.2. First bearing, 6. Wire stop plate, 7. Wire cutting port, 8. Waste wire port, 9. Shaft screw, 10. Elastic element, 11. Mounting bracket, 12. Fixed bracket, 13. Rotating shaft, 14. Drive device, 15. Transmission gear, 16. Housing, 17. Helical gear, 18. Wire cutting gear, 19. Bracket mounting hole, 20. Second bearing, 21. Wire feeding groove. Detailed Implementation

[0023] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: As Figure 1 , Figure 3 , Figure 4 and Figure 6 The automatic thread-cutting mechanism for a sewing machine shown includes a fixed base 1, which is a plate-shaped structure. A thread-cutting component is provided on one side of the fixed base 1 and arranged on the surface of the fixed base 1. A drive component is also arranged on the fixed base 1, which can drive the thread-cutting component to perform the thread-cutting operation.

[0025] Specifically, such as Figure 3 and Figure 4 As shown, the drive assembly includes a wire-cutting gear 18 and a drive block 5. The wire-cutting gear 18 is arranged on the side of the wire-cutting assembly away from the fixed base 1, and a certain distance is maintained between the wire-cutting gear 18 and the wire-cutting assembly to prevent interference between the movement of the wire-cutting gear 18 and the movement of the wire-cutting assembly. Furthermore, the drive block 5 is arranged on the end face of the wire-cutting gear 18 near the wire-cutting assembly, and the drive block 5 is eccentrically arranged on the wire-cutting gear 18. In this way, when the wire-cutting gear 18 rotates, the drive block 5 can generate a circular trajectory movement, which in turn causes the wire-cutting blade 2 in the wire-cutting assembly to swing, thereby realizing the wire-cutting operation.

[0026] Specifically, such as Figure 6 As shown, the wire cutting assembly includes a moving wire cutting blade 2 and a fixed wire cutting blade 3. The fixed wire cutting blade 3 is a stationary blade, while the moving wire cutting blade 2 is a blade that can rotate relative to the fixed wire cutting blade 3. The size of the fixed wire cutting blade 3 is smaller than that of the moving wire cutting blade 2. The fixed wire cutting blade 3 is approximately L-shaped, with one end being the cutting edge and the other end having a hinge hole. In addition, there is a mounting hole at both ends and at the right angle of the fixed wire cutting blade 3. The fixed wire cutting blade 3 is fixedly mounted on the mounting base 1 using screws and other connectors and the three mounting holes. The moving wire cutting blade 2 is elongated, with a cutting edge at one end that matches the fixed wire cutting blade 3. The moving wire cutting blade 2 also has a hinge hole near the cutting edge. The hinge holes of the moving wire cutting blade 2 and the fixed wire cutting blade 3 are aligned and connected by a shaft screw 9, thereby achieving a hinge between the fixed wire cutting blade 3 and the moving wire cutting blade 2.

[0027] Furthermore, the moving wire cutter 2 is located at the center of the fixed base 1 on the side away from the blade edge, and an elongated groove 4 is provided on the section of the moving wire cutter 2 away from the blade edge. The elongated groove 4 can be a through hole. A drive block 5 of the drive assembly is provided in the elongated groove 4. After the drive assembly is activated, the drive assembly can drive the drive block 5 to move along a direction perpendicular to the length of the moving wire cutter 2. Thus, the drive block 5 can apply a force perpendicular to the length of the moving wire cutter 2 to the moving wire cutter 2, causing the moving wire cutter 2 to deflect. At the same time, the drive block 5 also produces a sliding effect within the elongated groove 4.

[0028] To facilitate control of the movement of the moving wire cutter 2, the fixed wire cutter 3 is directly arranged on the surface of the fixed base 1, while the moving wire cutter 2 is arranged on the end face of the fixed wire cutter 3 away from the fixed base 1. The moving wire cutter 2 and the fixed wire cutter 3 are in contact, and a wire cutting opening 7 is formed between their blades.

[0029] Furthermore, a waste wire opening 8 is provided on the fixing base 1. The waste wire opening 8 is located at the edge of the fixing base 1 and is V-shaped, which is adapted to the V-shaped wire cutting opening 7 formed by the wire cutting fixed blade 3 and the wire cutting moving blade 2. The fixing base 1 is composed of multiple layers of plates. The aforementioned waste wire opening 8 is provided on the plate on which the wire cutting assembly is arranged, and the middle plate has a channel to collect the generated waste wire, preventing the waste wire from accumulating at the wire cutting opening 7 and affecting the wire cutting operation.

[0030] A wire stop plate 6 is also provided on the opposite side of the wire cutting blade 3. The size and shape of the wire stop plate 6 are similar to the size and shape of the blade of the wire cutting blade 3. The wire stop plate 6 is also in direct contact with the fixing plate 1, and the wire stop plate 6 is directly fixed to the fixing base 1 by screws or other connecting parts. The wire stop plate 6 and the blade of the wire cutting blade 3 also form a V-shape. The wire stop plate 6 is located between the wire cutting blade 2 and the fixing base 1, and the thickness of the wire stop plate 6 is adapted to the thickness of the wire cutting blade 2. In this way, the two ends of the wire stop plate 6 are in contact with the fixing base 1 and the wire cutting blade 2 respectively. The wire stop plate 6 can prevent the wire end to be cut from falling into the gap formed between the wire cutting blade 2 and the fixing base 1. By filling the gap between the wire cutting blade 2 and the fixing base 1, the wire stop plate 6 effectively limits the range of the wire end and prevents the wire end from not being cut.

[0031] Furthermore, an elastic element 10 is provided on the shaft screw 9 connecting the moving wire cutter 2 and the fixed wire cutter 3. Specifically, the elastic element 10 is a circular spring structure, sleeved on the shaft screw 9, and located on the side of the moving wire cutter 2 away from the fixed wire cutter 3. In this way, the elastic element 10 can generate a squeezing force on the moving wire cutter 2 towards the fixed wire cutter 3, so that a shearing effect is formed between the moving wire cutter 2 and the fixed wire cutter 3, ensuring the shearing force between them and ensuring that the wire end can be cut off. In addition, by adjusting the tightness of the shaft screw 9, the preload generated by the elastic element 10 can also be adjusted, thereby adjusting the shearing effect.

[0032] Example 2: Figures 1 to 6 The automatic thread-cutting mechanism for a sewing machine shown includes a fixed base 1, which is a plate-shaped structure. A thread-cutting component is provided on one side of the fixed base 1 and arranged on the surface of the fixed base 1. A drive component is also arranged on the fixed base 1, which can drive the thread-cutting component to perform the thread-cutting operation.

[0033] Specifically, such as Figure 3 and Figure 4 As shown, the drive assembly includes a wire-cutting gear 18 and a drive block 5. The wire-cutting gear 18 is arranged on the side of the wire-cutting assembly away from the fixed base 1, and a certain distance is maintained between the wire-cutting gear 18 and the wire-cutting assembly to prevent interference between the movement of the wire-cutting gear 18 and the movement of the wire-cutting assembly. Furthermore, the drive block 5 is arranged on the end face of the wire-cutting gear 18 near the wire-cutting assembly, and the drive block 5 is eccentrically arranged on the wire-cutting gear 18. In this way, when the wire-cutting gear 18 rotates, the drive block 5 can generate a circular trajectory movement, which in turn causes the wire-cutting blade 2 in the wire-cutting assembly to swing, thereby realizing the wire-cutting operation.

[0034] Furthermore, the drive assembly also includes a mounting bracket 11 and a fixing bracket 12. Two bracket mounting holes 19 are provided on the fixing base 1 and located on both sides of the wire cutting assembly. The mounting bracket 11 is fixed in the bracket mounting hole 19. One end of the mounting bracket 11 is located in the bracket mounting hole 19, and the other end protrudes from the surface of the fixing base 1 and extends to a certain height. A fixing bracket 12 is fixedly connected between the two mounting brackets 11, so that the fixing bracket 12 maintains a certain distance from the wire cutting assembly on the fixing base 1. Specifically, the fixing bracket 12 is fixedly connected to the mounting bracket 11 by screws or other connecting parts.

[0035] A bearing hole is provided in the middle of the fixing frame 12. The wire-cutting gear 18 is located between the fixing frame 12 and the fixing base 1 (or the wire-cutting assembly). A rotating shaft 13 is provided on the axis of the wire-cutting gear 18. One end of the rotating shaft 13 is fixedly connected to the wire-cutting gear 18, and the other end of the rotating shaft 13 is rotatably connected to the fixing frame 12 through a second bearing 20. In this way, the wire-cutting gear 18 is rotatably connected to the fixing frame 12. After the wire-cutting gear 18 is fixed, a certain distance is still maintained between the wire-cutting gear 18 and the wire-cutting assembly to prevent interference between them.

[0036] Furthermore, the drive block 5 consists of an external threaded rod 5.1 and a first bearing 5.2. One end of the external threaded rod 5.1 is fixedly connected to the inside of the first bearing 5.2, while the other end of the external threaded rod 5.1 is fixedly connected to the eccentric position of the wire-cutting gear 18. At this time, the first bearing 5.2 is still located in the elongated groove 4 of the wire-cutting moving blade 2. Therefore, when the wire-cutting gear 18 rotates, it will drive the drive block 5 to move, thereby causing the wire-cutting moving blade 2 to rotate to form a wire-cutting operation.

[0037] Furthermore, the drive assembly also includes a drive device 14, which is located on the side of the fixed base 1 away from the wire-cutting assembly. The drive device 14 is a rotary motor, and a transmission gear 15 is provided at the output end of the drive device 14. The transmission gear 15 is located on the side of the fixed base 1 where the wire-cutting assembly is arranged, and the transmission gear 15 meshes with the wire-cutting gear 18. When the drive device 14 drives, the transmission gear 15 can drive the wire-cutting gear 18 to rotate, thereby realizing the wire-cutting operation. In addition, the number of teeth of the transmission gear 15 is less than the number of teeth of the wire-cutting gear 18, so that the wire-cutting gear 18 has a speed reduction effect, improves the stability of wire cutting, and ensures the wire cutting effect.

[0038] Furthermore, a housing 16 is also provided on the fixed base 1. The housing 16 is arranged on the side of the fixed base 1 where the wire cutting assembly is located. The housing 16 can protect the wire cutting mechanism. A wire feeding groove 21 is provided on the housing 16 near the wire cutting opening 7. The wire feeding groove 21 can hold the wire end to be cut. A limiting opening formed by multiple sets of helical teeth 17 is also provided on the groove side of the wire feeding groove 21 to prevent the wire end from being inaccurately positioned.

[0039] Specifically, such as Figure 6 As shown, the wire cutting assembly includes a moving wire cutting blade 2 and a fixed wire cutting blade 3. The fixed wire cutting blade 3 is a stationary blade, while the moving wire cutting blade 2 is a blade that can rotate relative to the fixed wire cutting blade 3. The size of the fixed wire cutting blade 3 is smaller than that of the moving wire cutting blade 2. The fixed wire cutting blade 3 is approximately L-shaped, with one end being the cutting edge and the other end having a hinge hole. In addition, there is a mounting hole at both ends and at the right angle of the fixed wire cutting blade 3. The fixed wire cutting blade 3 is fixedly mounted on the mounting base 1 using screws and other connectors and the three mounting holes. The moving wire cutting blade 2 is elongated, with a cutting edge at one end that matches the fixed wire cutting blade 3. The moving wire cutting blade 2 also has a hinge hole near the cutting edge. The hinge holes of the moving wire cutting blade 2 and the fixed wire cutting blade 3 are aligned and connected by a shaft screw 9, thereby achieving a hinge between the fixed wire cutting blade 3 and the moving wire cutting blade 2.

[0040] Furthermore, the moving wire cutter 2 is located at the center of the fixed base 1 on the side away from the blade edge, and an elongated groove 4 is provided on the section of the moving wire cutter 2 away from the blade edge. The elongated groove 4 can be a through hole. A drive block 5 of the drive assembly is provided in the elongated groove 4. After the drive assembly is activated, the drive assembly can drive the drive block 5 to move along a direction perpendicular to the length of the moving wire cutter 2. Thus, the drive block 5 can apply a force perpendicular to the length of the moving wire cutter 2 to the moving wire cutter 2, causing the moving wire cutter 2 to deflect. At the same time, the drive block 5 also produces a sliding effect within the elongated groove 4.

[0041] To facilitate control of the movement of the moving wire cutter 2, the fixed wire cutter 3 is directly arranged on the surface of the fixed base 1, while the moving wire cutter 2 is arranged on the end face of the fixed wire cutter 3 away from the fixed base 1. The moving wire cutter 2 and the fixed wire cutter 3 are in contact, and a wire cutting opening 7 is formed between their blades.

[0042] Furthermore, a waste wire opening 8 is provided on the fixing base 1. The waste wire opening 8 is located at the edge of the fixing base 1 and is V-shaped, which is adapted to the V-shaped wire cutting opening 7 formed by the wire cutting fixed blade 3 and the wire cutting moving blade 2. The fixing base 1 is composed of multiple layers of plates. The aforementioned waste wire opening 8 is provided on the plate on which the wire cutting assembly is arranged, and the middle plate has a channel to collect the generated waste wire, preventing the waste wire from accumulating at the wire cutting opening 7 and affecting the wire cutting operation.

[0043] A wire stop plate 6 is also provided on the opposite side of the wire cutting blade 3. The size and shape of the wire stop plate 6 are similar to the size and shape of the blade of the wire cutting blade 3. The wire stop plate 6 is also in direct contact with the fixing plate 1, and the wire stop plate 6 is directly fixed to the fixing base 1 by screws or other connecting parts. The wire stop plate 6 and the blade of the wire cutting blade 3 also form a V-shape. The wire stop plate 6 is located between the wire cutting blade 2 and the fixing base 1, and the thickness of the wire stop plate 6 is adapted to the thickness of the wire cutting blade 2. In this way, the two ends of the wire stop plate 6 are in contact with the fixing base 1 and the wire cutting blade 2 respectively. The wire stop plate 6 can prevent the wire end to be cut from falling into the gap formed between the wire cutting blade 2 and the fixing base 1. By filling the gap between the wire cutting blade 2 and the fixing base 1, the wire stop plate 6 effectively limits the range of the wire end and prevents the wire end from not being cut.

[0044] Furthermore, an elastic element 10 is provided on the shaft screw 9 connecting the moving wire cutter 2 and the fixed wire cutter 3. Specifically, the elastic element 10 is a circular spring structure, sleeved on the shaft screw 9, and located on the side of the moving wire cutter 2 away from the fixed wire cutter 3. In this way, the elastic element 10 can generate a squeezing force on the moving wire cutter 2 towards the fixed wire cutter 3, so that a shearing effect is formed between the moving wire cutter 2 and the fixed wire cutter 3, ensuring the shearing force between them and ensuring that the wire end can be cut off. In addition, by adjusting the tightness of the shaft screw 9, the preload generated by the elastic element 10 can also be adjusted, thereby adjusting the shearing effect.

Claims

1. An automatic thread-cutting mechanism for a sewing machine, characterized in that, The device includes a fixed base, on which a wire-cutting assembly and a driving assembly are mounted. The wire-cutting assembly includes a wire-cutting blade with an elongated groove. The driving assembly includes a wire-cutting gear and a driving block eccentrically arranged on the wire-cutting gear, with the driving block slidably connected within the elongated groove.

2. The automatic thread-cutting mechanism for a sewing machine according to claim 1, characterized in that, The wire cutting assembly also includes a fixed wire cutting blade hinged to the moving wire cutting blade. The fixed wire cutting blade is located on the side of the moving wire cutting blade near the fixed base, and the fixed wire cutting blade is fixedly connected to the fixed base.

3. The automatic thread-cutting mechanism for a sewing machine according to claim 2, characterized in that, A wire-blocking plate is provided on the opposite side of the fixed wire-cutting blade and on the side of the moving wire-cutting blade near the fixed base. The wire-blocking plate is flush with the surface of the fixed wire-cutting blade.

4. The automatic thread-cutting mechanism for a sewing machine according to claim 2, characterized in that, A wire-cutting opening is formed between the fixed wire-cutting blade and the movable wire-cutting blade, and a waste wire opening is provided on the fixed base corresponding to the position of the wire-cutting opening.

5. The automatic thread-cutting mechanism for a sewing machine according to claim 2, characterized in that, The moving wire cutter and the fixed wire cutter are hinged together by a pivot screw, and an elastic element is provided on the pivot screw on the side of the moving wire cutter away from the fixed wire cutter.

6. An automatic thread-cutting mechanism for a sewing machine according to any one of claims 1 to 5, characterized in that, The mounting bracket is provided on the side of the fixed base where the wire cutting component is located. The mounting bracket is provided with a fixing frame, and the wire cutting gear is rotatably connected to the fixing frame near the side of the wire cutting component.

7. The automatic thread-cutting mechanism for a sewing machine according to claim 6, characterized in that, One end of the drive block is an externally threaded rod that is threadedly connected to the wire shearing gear, and the other end of the drive block is a first bearing that is slidably connected to the elongated groove.

8. The automatic thread-cutting mechanism for a sewing machine according to claim 6, characterized in that, A rotating shaft is provided on the axis of the wire-cutting gear, and the wire-cutting gear is rotatably connected to the fixed frame through the rotating shaft.

9. An automatic thread-cutting mechanism for a sewing machine according to claim 6, characterized in that, The drive assembly further includes a drive device, the output end of which is provided with a transmission gear, which meshes with the wire shearing gear.

10. An automatic thread-cutting mechanism for a sewing machine according to claim 4, characterized in that, The mounting base has a wire-cutting assembly on one side, and a housing is provided on the housing corresponding to the wire-cutting opening. The wire-feeding groove is provided on the side of the wire-feeding groove with several oblique teeth.

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