Thread trimming cutter and double-moving-cutter sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a thread trimming cutter and a double-moving-cutter sewing machine. The thread trimming cutter comprises a thread trimming mechanism, the thread trimming mechanism comprises a first moving cutter and a second moving cutter which are arranged on the peripheral side of a rotating shuttle mechanism in a sleeving mode and rotate around the rotating shuttle mechanism, and the first moving cutter is provided with a thread hooking hole; a machine needle can penetrate through the hook and hook a sewing thread in the sewing starting stage; the first movable cutter is provided with a movable cutter point used for inserting a wire ring, a first wire hooking groove and a second wire hooking groove are formed in the two opposite sides of the movable cutter point, and wire hooking openings are formed in the edge of the first wire hooking groove and the edge of the second wire hooking groove. When the first movable cutter rotates, the openings in the two sides hook a sewing thread into the first thread hooking groove and the second thread hooking groove respectively at the sewing end stage, the sewing thread is wound below the movable cutter point, and the reserved sewing thread length comprises three sewing thread segments between the cut-off position and the first thread hooking groove, between the first thread hooking groove and the second thread hooking groove and between the second thread hooking groove and a needle machine. Adjustment and use of follow-up sewing starting are facilitated, and then convenience of follow-up sewing operation is improved.

Description

Technical Field

[0001] The present technical solution relates to the technical field of sewing machines, and particularly refers to a thread cutting tool and a double-action knife sewing machine. Background Art

[0002] The thread cutting mechanism of a sewing machine is a device used to automatically cut the sewing thread in a sewing machine. It can cut the sewing thread during the starting stage and the finishing stage of sewing. It is usually composed of two knives combined, that is, the moving knife and the fixed knife cooperate to cut the thread.

[0003] For example, in Chinese Patent CN115679562A, this patent discloses a thread cutting mechanism of a sewing machine. There are a driving knife and a fixed moving knife on the thread cutting mechanism. The driving knife is provided with a groove surface, a convex surface and an inclined surface. The cutting edge is arranged at the connection of the groove surface and the convex surface. The fixed moving knife is also provided with an inclined surface and a cutting edge. The driving knife moves towards the fixed moving knife, and the thread is cut under the relative action of the two side cutting edges of the two knives.

[0004] For the above-mentioned sewing machine thread cutting mechanism, after cutting the thread at the end of sewing in the existing thread cutting mechanism, there is still a part of the sewing thread left on the driving knife. Its length is short, which easily causes the sewing machine needle to carry out the thread end and make it fall off. When placing the sewing material on the sewing machine and starting sewing again, the user needs to frequently manually adjust the sewing thread end on the driving knife to be clamped, which is troublesome to use and needs to be improved. Summary of the Invention

[0005] In order to improve the problem that the reserved sewing thread is short and easy to get off the line, resulting in troublesome adjustment and use, the present technical solution provides a thread cutting tool and a double-action knife sewing machine.

[0006] The purpose of the present technical solution is achieved as follows:

[0007] A thread cutting tool includes a tool body. The tool body has a moving tool tip for inserting into the thread loop. On both opposite sides of the moving tool tip, there are provided a first thread hooking groove and a second thread hooking groove. At the edges of the first thread hooking groove and the second thread hooking groove, there are provided openings for hooking the thread.

[0008] The tool body has a first cutting edge, which is arranged at the front edge of the tool body.

[0009] The tool body is provided with a receiving groove, which includes a first receiving groove that is opened along the rotation direction of the tool body. One end of the first receiving groove communicates with the first thread hooking groove, and the other end extends to be correspondingly arranged with the first cutting edge, and is used for receiving the sewing thread passing through the first thread hooking groove.

[0010] The tool body is provided with a thread hooking hole, which is used for the sewing machine needle to pass through and hook the sewing thread during the starting stage of sewing.

[0011] Through the above technical solution, when the thread trimming tool is used normally, the thread hook hole can pass through the machine needle, and the sewing thread on the machine needle is kept in the thread hook hole for thread cutting operation in the sewing start stage. When it is in the sewing end stage, the driver drives the tool body located at the starting position to rotate so that the tip of the movable knife passes through the thread loop. After the tool body is driven to rotate in the opposite direction to the specified position again, the thread hook groove 1 and the thread hook groove 2 on both sides hook the surface and bottom thread through the opening position, and continue to rotate and pull the thread until the tool body returns to the starting position. At this time, part of the line segment is wound around the bottom of the movable knife tip. A accommodating groove 1 for accommodating the sewing thread is left between the thread hook groove 1 and the first cutting edge. The groove extends along the rotation direction of the tool body, providing a makeshift channel to guide the sewing thread to the cutting position, thereby improving the smoothness and accuracy of the thread cutting operation.

[0012] At this time, the reserved sewing thread length includes three sewing thread segments between the cutting point and the thread hook groove one, between the thread hook groove one and the thread hook groove two, and between the thread hook groove two and the needle machine, ensuring that the length of the reserved thread segments is moderate, which is convenient for the subsequent adjustment and use of the seam, improves the overall efficiency of the sewing operation, and thus improves the convenience of the sewing operation.

[0013] Preferably, the accommodating groove further includes an accommodating groove 2 connected to the thread hooking hole, the other end of which is connected to the thread hooking groove 1 for accommodating the sewing thread inserted into the thread hooking hole.

[0014] Through the above technical solution, the second accommodating groove is connected to the first accommodating groove, and one end of the accommodating groove is connected to the thread hook hole. When the thread is cut in the sewing stage, the two accommodating grooves cooperate with each other to provide space, providing space for the sewing thread segment between the needle and the thread hook hole. The groove direction plays a guiding role, further improving the accuracy of the sewing thread arrangement.

[0015] Preferably, the tool body is further provided with a wiring groove, one end of which is connected to the second thread hooking groove for accommodating the sewing thread passing through the second thread hooking groove.

[0016] Through the above technical solution, an additional wiring groove is added to the tool body, which provides space for the sewing thread segment between the hook wire groove 2 and the machine needle. The groove direction plays a guiding role to avoid thread pressing and improve the stability and accuracy of sewing thread arrangement.

[0017] Preferably, the movable blade tip has a second line hooking tip portion, which is arranged on the inner side of the movable blade tip and leaves a line passing space between the movable blade tip and the tool body.

[0018] Through the above technical solution, the thread hooking tip 1 is set as a protruding tip, and the thread passing space between the thread hooking tip 1 and the tool body is for the sewing thread to pass through. At the end stage of sewing, it enhances the thread hooking ability of the sewing thread into the thread hooking groove 2 to ensure normal production operation.

[0019] Preferably, the movable blade tip further has a first wire hooking tip portion, which is respectively arranged at the openings of the first wire hooking groove and the second wire hooking groove in one-to-one correspondence, and extends away from the direction in which the movable blade tip inserts the wire.

[0020] Through the above technical solution, the second thread hooking tip is set with a protruding tip. At the end of sewing, the two thread hooking tips can cooperate to hook the bottom line from the opposite sides and pass through the opening into the corresponding thread hooking groove, thereby improving the accuracy and stability of the thread hooking, thereby further ensuring the smooth progress of the operation.

[0021] Preferably, the side walls opposite to the opening of the first wire hooking groove and the first wire hooking tip have a wire-abutting surface that is inclined toward the inside of the first wire hooking groove.

[0022] Through the above technical solution, a thread-retaining surface is provided on one side wall of the thread hooking groove. At the end of sewing, after the movable knife tip rotates forward, the thread-retaining surface can effectively intercept the sewing thread at the opening of the thread hooking groove 1, and preliminarily guide the sewing thread into the thread hooking groove 1 through the inclined setting, so that the subsequent thread hooking tip 1 can completely hook the sewing thread into the thread hooking groove 1. The thread-retaining surface provides a natural introduction path for the sewing thread, ensuring the smooth progress of the thread cutting operation.

[0023] A double-movable-knife sewing machine, comprising a frame, on which are provided a thread trimming mechanism, a presser foot lifting mechanism, and a cloth feeding mechanism, the thread trimming mechanism comprising a drive assembly, a second movable knife, and the knife body, characterized in that the knife body is the thread trimming knife according to any one of the above claims;

[0024] A presser foot lifting mechanism is provided on the frame, wherein a presser foot lifting mechanism is provided at the lower portion thereof for lifting and pressing the sewing material;

[0025] A cloth feeding mechanism is provided on the frame and below the presser foot lifter, and is used for feeding the sewing material forward;

[0026] The tool body and the second movable knife are both mounted on the outer periphery of the rotary hook mechanism and rotate around it, and the drive assembly includes a first drive motor and a second drive motor;

[0027] When the driving motor 1 drives the tool body to rotate, the openings on both sides hook the sewing thread into the thread hooking groove 1 and the thread hooking groove 2 respectively at the end of sewing, so that the sewing thread is wound under the movable knife tip.

[0028] Through the above technical solution, a thread cutting mechanism with a double moving knife is provided, and another knife is set as the second moving knife. When in the starting sewing stage, the first moving knife is driven to rotate around the outer peripheral side of the rotary hook mechanism to a specified position so that the thread hooking hole can pass through the sewing needle, and the sewing thread on the sewing needle is kept in the thread hooking hole. After the sewing needle retreats, the tool body is driven to rotate (clockwise) to a specified position, and the two cutting edges are made to approach each other by cooperating with the second moving knife, and when they coincide, the sewing thread located at the first cutting edge is cut off, so as to realize the removal of the thread end during starting sewing. The first thread hooking groove can hook the sewing thread, and continuous sewing is carried out by the cooperation of the feeding mechanism and the presser foot lifting mechanism. When in the finishing stage, the sewing thread is cut off during finishing according to the same thread cutting operation.

[0029] Preferably, the front end of the second moving knife has a second cutting edge, which is correspondingly arranged opposite to the first cutting edge;

[0030] When the second moving knife is driven by the second driving motor, the second cutting edge coincides with the first cutting edge to cut off the sewing thread.

[0031] Through the above technical solution, the first cutting edge is correspondingly arranged on the front side of the first moving knife, and the front end of the second moving knife is correspondingly provided with a second cutting edge. When the second moving knife is driven to move close to the first moving knife, the two cutting edges are in close contact to achieve seamless cooperation, and the sewing thread is cut off at the moment of coincidence, reducing the residual thread end and improving the thread cutting accuracy and efficiency.

[0032] Preferably, the presser foot lifting mechanism includes a cam, a link structure and a presser bar structure, and the lower part of the link structure acts on the cam;

[0033] The other end of the link structure acts on the presser bar structure, and the presser foot is arranged at the lower part of the presser bar structure. The cam is fixed on the motor shaft of the second driving motor, so as to drive the presser foot to perform lifting and pressing operations.

[0034] Through the above technical solution, the second driving motor drives the cam to rotate synchronously. Due to the inconsistency of the protrusions on the outer peripheral wall of the cam, the multiple transmission rods in the link structure are driven to swing synchronously in cooperation, and then the other end of the link structure acts on the presser bar structure, realizing the lifting or lowering of the presser bar structure, driving the presser foot to perform lifting and pressing actions on the sewing material, and facilitating the stability of the sewing material during sewing.

[0035] Preferably, the feeding mechanism includes a tooth frame, feed teeth arranged on the tooth frame, a tooth lifting seat, a tooth changing seat and a tooth changing driving member;

[0036] The tooth lifting seat and the tooth changing seat are respectively hinged to both ends of the tooth frame in one-to-one correspondence, and the tooth lifting seat drives the tooth frame to move up and down;

[0037] The tooth replacement seat is provided with a transmission assembly, which includes a tooth replacement bracket, a feeding connecting rod, and a feeding crank. The tooth replacement seat is arranged on the tooth replacement bracket. The crank end of the tooth replacement bracket is hinged to the end of the feeding connecting rod, and the other end of the feeding connecting rod is hinged to the end of the feeding crank.

[0038] The other end of the feeding crank is connected to the driving end of the tooth replacement driving member. The tooth replacement driving member drives the feeding crank to swing, so as to drive the tooth bracket to swing left and right.

[0039] Through the above technical solution, the output shaft of the tooth replacement driving member drives the feeding crank in the transmission assembly to rotate. The feeding crank drives the feeding connecting rod to swing, the feeding connecting rod drives the tooth replacement bracket to swing, and the tooth replacement bracket drives the tooth replacement seat to swing, thereby realizing the left and right swing adjustment of the tooth bracket. The shaft rod drives the tooth lifting seat to swing, and the tooth lifting seat drives the other end of the tooth bracket to move up and down, so as to realize the movement of the feeding teeth on the fabric.

[0040] The prominent and beneficial technical effects of this technical solution compared with the prior art are:

[0041] 1. In this technical solution, the moving tool tip passes through the thread loop by rotating the tool body. The two hook grooves 1 and 2 respectively hook the top and bottom threads through the openings. The sewing thread segment is located in the first receiving groove and extends towards the first cutting edge for shearing. After cutting, a part of the sewing thread is reserved, and its thread length includes three sewing thread segments between the cutting point and the first hook groove, between the first hook groove and the second hook groove, and between the second hook groove and the sewing machine, which is convenient for subsequent adjustment and use of the starting sewing, and thus improves the convenience of sewing operations.

[0042] 2. In this technical solution, the tool body is provided with receiving grooves, including a first receiving groove and a second receiving groove, and the two receiving grooves communicate with each other, so as to provide a space for the sewing thread when hooking the sewing thread in the thread hooking hole and the first hook groove, and the groove direction plays a guiding role, improving the accuracy of the sewing thread arrangement. Description of the Drawings

[0043] Figure 1 It is a schematic diagram of the overall structure of the thread cutting tool for the embodiment;

[0044] Figure 2 It is a schematic diagram of the overall structure of the double-action knife sewing machine for the embodiment;

[0045] Figure 3 It is a schematic diagram of the overall structure of the tool body and the second moving knife in the double-action knife sewing machine for the embodiment;

[0046] Figure 4 It is one of the thread hooking schematic diagrams of the thread hooking hole in the thread cutting tool for the embodiment;

[0047] Figure 5 It is the second thread hooking schematic diagram of the thread hooking hole in the thread cutting tool for the embodiment;

[0048] Figure 6 Schematic structural diagram of the thread cutting mechanism cooperating with the thread cutting in the double-acting knife sewing machine of the embodiment;

[0049] Figure 7 Schematic overall structural diagram of the cloth feeding mechanism in the double-acting knife sewing machine of the embodiment;

[0050] Figure 8 Schematic overall structural diagram of the presser foot lifting mechanism in the double-acting knife sewing machine of the embodiment.

[0051] Reference numerals: 1. Tool body; 2. Second moving knife; 3. Moving knife tip; 4. Groove for hooking thread 1; 5. Groove for hooking thread 2; 6. First cutting edge; 7. Second cutting edge; 8. Receiving groove 1; 9. Receiving groove 2; 10. Thread hooking hole; 11. Wiring groove; 12. Second thread hooking tip; 13. Thread passing space; 14. First thread hooking tip; 15. Thread pressing surface; 16. Thread clamping device; 17. Thread sucking device; 18. Driving assembly; 181. First driving motor; 182. Second driving motor; 19. Presser foot lifting mechanism; 191. Cam; 192. Link structure; 193. Presser bar structure; 20. Cloth feeding mechanism; 201. Tooth rest; 202. Feed teeth; 203. Lifting tooth seat; 204. Tooth replacement seat; 205. Tooth replacement driving member; 21. Transmission assembly; 211. Tooth replacement bracket; 212. Feed connecting rod; 213. Feed crank; 22. Machine frame; 23. Presser foot; 24. Thread cutting mechanism; 100. Needle; 200. Rotating hook mechanism. Detailed implementation manners

[0052] The following further elaborates in detail on the specific implementation manners of the technical solution with reference to the drawings.

[0053] Embodiment:

[0054] See Figure 1 and Figure 3 , a thread cutting tool, including a tool body 1, the tool body 1 has a moving knife tip 3, the end portion of which is in a protruding sharp angle shape, and is used to insert into the thread loop from below in the finishing stage, so that the top thread and the bottom thread sewing threads are respectively located on opposite sides of the moving knife tip 3. Grooves for hooking thread 1 and grooves for hooking thread 2 are respectively formed on opposite sides of the moving knife tip 3. Among them, the groove for hooking thread 1 is located outside the moving knife tip 3, and an opening is formed on the side wall of its outer edge facing outward. The moving knife tip 3 has a first thread hooking tip 14 corresponding to the opening, which is in a sharp angle shape and is arranged in a direction opposite to the end portion of the moving knife tip 3. A thread pressing surface 15 is also provided at the opening facing the insertion direction, which is arranged opposite to the first thread hooking tip 14 and protrudes from the first thread hooking tip 14, and the thread pressing surface 15 inclines towards the groove for hooking thread 1.

[0055] Similarly, the second thread groove 5 is oppositely arranged inside the moving tool tip 3, and an opening is formed in the side wall at its edge. The moving tool tip 3 has a second thread-hooking tip 12 corresponding to the opening, and a thread-passing space 13 is left between it and the tool body 1. The thread-passing space 13 connects the second thread groove 5 with the outside.

[0056] During the process of the moving tool tip 3 passing forward through the thread loop, continuous movement causes the sewing thread located inside to pass through the thread-passing space 13 and abut against the side wall opposite to the second thread-hooking tip 12. The sewing thread located outside abuts against the thread-abutting surface 15, and the thread-abutting surface 15 is oppositely arranged with the first thread-hooking tip 14. The sewing threads on both sides respectively enter the first thread groove 4 and the second thread groove 5 through the opening. When the moving tool tip 3 moves in the reverse direction, the thread-hooking tips on both sides completely hook the sewing threads on both sides into the two thread grooves. At this time, the connection between the sewing threads on both sides is wound around the lower part of the moving tool tip 3 and is tightened under the moving tool tip 3 as it moves.

[0057] See Figure 5 and Figure 6 , the tool body 1 is provided with a receiving groove, which includes a first receiving groove 8. The first receiving groove 8 is arranged along the rotation direction of the tool body 1. One end of the first receiving groove 8 communicates with the first thread groove 4, and the other end extends and is correspondingly arranged with the first cutting edge 6, for accommodating the sewing thread segment passing out of the first receiving groove 8 to the first cutting edge 6. A wiring groove 11 is formed on the upper end surface of the tool body 1, and one end of it communicates with the second thread groove 5, for accommodating the sewing thread segment between the sewing machine needle 100 and passing into the second thread groove 5, which is suitable for use in the finishing stage;

[0058] See Figure 4 and Figure 5 , the tool body 1 is provided with a thread-hooking hole 10. The thread-hooking hole 10 and the first thread groove 4 are arranged along the rotation direction of the tool body 1. The thread-hooking hole 10 is arranged at the rear side of the first thread groove 4. When the tool body 1 rotates so that the thread-hooking hole 10 is exactly below the sewing machine needle 100, the sewing machine needle 100 performs the downward needle action of the first stitch in the starting sewing stage. The sewing machine needle 100 first passes downward through the thread-hooking hole 10, then withdraws upward from the hole and is lifted to a suitable position above the needle plate. The thread take-up lever of the sewing machine picks up the thread and drives the upper thread on the sewing machine needle 100 to retreat. During the process of the thread take-up lever picking up the thread, the storage of the upper thread is completed, and the sewing thread is held in the thread-hooking hole 10 of the tool body 1.

[0059] The receiving groove further includes a second receiving groove 9. One end of the second receiving groove 9 communicates with the thread-hooking hole 10, and the other end extends to the first thread groove 4. Based on the fact that the first thread groove 4 vertically penetrates, the second receiving groove 9 and the first receiving groove 8 have the same groove direction so that they are spliced into a complete receiving groove. The tool body 1 drives the sewing thread to rotate again, and the sewing thread segment between the thread-hooking hole 10 and the first cutting edge 6 is accommodated in the receiving groove, which is suitable for use in the starting sewing stage.

[0060] See Figure 2, A double-acting knife sewing machine, including a frame 22. In this embodiment, it shows the situation where a sewing needle 100 is installed above the thread cutting mechanism of the sewing machine device, and a sewing thread is passed through the lower end of the sewing needle 100. A thread cutting mechanism 24 is provided on the frame 22, which includes a driving component 18, a second moving knife 2 and the above-mentioned tool body 1. Both moving knives are sleeved on the outer peripheral side of the rotating shuttle mechanism 200 and are rotatably arranged around it, so that the two moving knives are coaxially arranged. The second moving knife 2 is arranged above the tool body 1. The driving component 18 includes a first driving motor 181 and a second driving motor 182. The front end of the second moving knife 2 abuts against the upper surface of the tool body 1 and is driven to slide by the second driving motor 182. The first driving motor 181 can drive the tool body 1 to operate.

[0061] See Figure 4 and Figure 6 , A second cutting edge 7 is provided at the front end of the second moving knife 2; when the tool body 1 and the second moving knife 2 approach each other, the first thread groove 4 or the second thread groove 5 will bring the sewing thread towards the second cutting edge 7. The sewing thread is not under pressure on the first cutting edge 6 and will not be cut off until the second cutting edge 7 coincides with the first cutting edge 6, and then the sewing thread is cut off.

[0062] In this embodiment, it also shows that the thread cutting mechanism is provided with a thread clamp 16. The thread clamp 16 is located beside the thread cutting mechanism and is arranged close to the tool body 1. The thread clamp 16 abuts against the inner end face of the tool body 1, so as to clamp the sewing thread passing through the thread hooking hole 10, for locking the sewing thread to stop supplying the thread to the sewing needle 100. When the fabric moves slightly, the needle machine makes the second needle go down, and then the sewing thread is cut off by the coincidence of the second cutting edge 7 and the first cutting edge 6. After cutting, the tool body 1 and the second moving knife 2 return to the initial position. It also includes a thread suction device 17, which is located beside the thread cutting mechanism and is arranged close to the second moving knife 2. The air outlet of the thread suction device 17 faces the thread clamp 16, for sucking the cut sewing thread.

[0063] See Figure 8 , A presser foot lifting mechanism 19 is also provided on the frame 22, which includes a cam 191, a link structure 192 and a presser bar structure 193. The cam 191 is fixed on the motor shaft of the second driving motor 182 to drive the cam 191 to rotate. Its outer peripheral wall has different convex degrees. The lower end of the link structure 192 acts on the cam 191, and the other end of the link structure 192 acts on the presser bar structure 193, so that the convex surface of the cam 191 can push up the link structure 192, and at this time drive the presser bar structure 193 to lift. Based on the fact that a presser foot 23 is fixed at the lower end of the presser bar structure 193, the lifting or pressing of the presser foot 23 on the sewing material is realized.

[0064] See Figure 7, the frame 22 is provided with a fabric feeding mechanism 20, which includes a tooth frame 201, fabric feeding teeth 202, a lifting tooth seat 203, a tooth replacement seat 204 and a tooth replacement driving member 205. The tooth frame 201 is located below the presser foot 23 and is movably arranged relative to the frame 22. The fabric feeding teeth 202 are fixed above the tooth frame 201 and are aligned with the position of the presser foot 23, and its upper end surface has a serrated structure.

[0065] The lifting tooth seat 203 is fixed at one end of a shaft rod, and the shaft rod is rotatably connected to the frame 22 and is driven to rotate by a driving device. Its rotation drives the lifting tooth seat 203 to swing. The other side of the lifting tooth seat 203 is hinged to one end of the tooth frame 201, so as to control the up and down movement of the tooth frame 201.

[0066] One side of the tooth replacement seat 204 is hinged to the other end of the tooth frame 201 far from the lifting tooth seat 203. It is provided with a transmission assembly 21, and the transmission assembly 21 includes a tooth replacement bracket 211, a feeding connecting rod 212 and a feeding crank 213. The tooth replacement seat 204 is fixed on the tooth replacement bracket 211. The crank end of the tooth replacement bracket 211 is hinged to the feeding connecting rod 212. The other end of the feeding connecting rod 212 is hinged to the feeding crank 213. The other end of the feeding crank 213 far from the hinge is fixed on the motor shaft of the tooth replacement driving member 205. By driving the feeding crank 213 to rotate by the tooth replacement driving member 205 and transmitting according to the hinge relationship, the tooth frame 201 is finally driven to swing.

[0067] The specific working process of this solution is as follows:

[0068] In this technical solution, the tool body 1 located at the starting position is driven to rotate. The end of the moving tool tip 3 passes through the thread loop. The inner sewing thread segment comes to the opening of the thread groove two 5 through the thread passing space 13. The other outer sewing thread segment abuts against the thread abutting surface 15 and comes to the opening of the thread groove one 4. At this time, the tool body 1 is driven to rotate in the reverse direction. The first thread hooking tip 14 hooks the outer sewing thread segment into the thread groove one 4, and the second thread hooking tip 12 hooks the inner sewing thread segment into the thread groove two 5, so as to hook the surface thread and the bottom thread and continuously rotate and pull the thread. At this time, the sewing thread segments passing through the two thread grooves are wound under the moving tool tip 3 and tightened. By the second moving tool 2 abuting and advancing on the upper side of the tool body 1, the second moving tool 2 and the tool body 1 coincide and cut under the sewing needle 100, completing the thread cutting operation in the finishing stage. The reserved sewing thread length includes three sewing thread segments between the cutting point and the thread groove one 4, between the thread groove one 4 and the thread groove two 5, and between the thread groove two 5 and the sewing machine, ensuring that the length of the reserved segment is appropriate, facilitating the adjustment and use of subsequent starting sewing, improving the overall efficiency of the sewing operation, and further improving the convenience of the sewing operation.

[0069] The above has shown and described the basic principles, main features and advantages of the present technical solution. Those skilled in the art should understand that the present technical solution is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present technical solution. Without departing from the spirit and scope of the present technical solution, the present technical solution will have various changes and improvements, and these changes and improvements all fall within the scope of the present technical solution claimed. The scope of protection required by the present technical solution is defined by the appended claims and their equivalents.

Claims

1. A wire cutting tool, characterized in that: The tool body (1) comprises a movable blade tip (3) for inserting a wire loop, a first wire hooking groove (4) and a second wire hooking groove (5) are provided on opposite sides of the movable blade tip (3), and wire hooking openings are provided at the edges of the first wire hooking groove (4) and the second wire hooking groove (5); The tool body (1) has a first cutting edge (6) which is arranged at the front edge of the tool body (1); The tool body (1) is provided with a receiving groove, which includes a receiving groove (8) which is opened along the rotation direction of the tool body (1). One end of the receiving groove (8) is connected to the thread hooking groove (4), and the other end extends to correspond to the first cutting edge (6) and is used to receive the sewing thread passing through the thread hooking groove (4). The tool body (1) is provided with a thread hooking hole (10), which is used for a machine needle (100) to pass through and hook the sewing thread during the sewing stage.

2. The wire cutting tool according to claim 1, wherein: The receiving groove further comprises a receiving groove 2 (9) connected to the thread hook hole (10), the other end of which is connected to the thread hook groove 1 (4) for receiving the sewing thread inserted into the thread hook hole (10).

3. The wire cutting tool according to claim 1, wherein: The tool body (1) is also provided with a wiring groove (11), one end of which is connected to the second hooking groove (5) for accommodating the sewing thread that passes through the second hooking groove (5).

4. The wire cutting tool according to claim 3, characterized in that: The movable blade tip (3) has a second line hooking tip portion (12), which is arranged inside the movable blade tip (3) and leaves a line passing space (13) between the movable blade tip and the tool body (1).

5. The wire-cutting tool according to claim 4, wherein: The movable blade tip (3) also has a first wire hooking tip portion (14), which is arranged in a one-to-one correspondence with the first wire hooking groove (4) and the second wire hooking groove (5) at the openings of the second wire hooking groove (5), and extends away from the direction of inserting the wire of the movable blade tip (3).

6. The wire cutting tool according to claim 5, characterized in that: The opening of the line hooking groove (4) and the side wall opposite to the line hooking tip (14) have a line-contacting surface (15), which is inclined toward the inside of the line hooking groove (4).

7. A double-acting knife sewing machine, comprising a machine frame (22), a thread cutting mechanism, a presser foot lifting mechanism (19) and a feeding mechanism (20) are arranged on the machine frame (22), the thread cutting mechanism comprises a driving assembly (18), a second moving knife (2) and the tool body (1), and is characterized in that: The tool body (1) is the thread cutting tool according to any one of claims 1 to 6; A presser foot lifting mechanism (19) is arranged on a machine frame (22), and a presser foot lifting mechanism (23) for lifting and pressing sewing materials is provided at the lower portion of the presser foot lifting mechanism (19); A cloth feeding mechanism (20) is provided on the frame (22) and is located below the presser foot lifter (23) for feeding the sewing material forward; The tool body (1) and the second movable knife (2) are both mounted on the outer periphery of the rotary hook mechanism (200) and are arranged to rotate around it. The driving assembly (18) includes a first driving motor (181) and a second driving motor (182). When the driving motor 1 (181) drives the tool body (1) to rotate, the openings on both sides hook the sewing thread into the thread hooking groove 1 (4) and the thread hooking groove 2 (5) at the end of sewing, so that the sewing thread is wound under the movable knife tip (3).

8. The double-acting knife sewing machine according to claim 7, characterized in that: The front end of the second movable knife (2) has a second cutting edge (7), which is arranged in a corresponding position with the first cutting edge (6); When the second driving motor (182) drives the second moving cutter, the second moving cutter (2) moves while being attached to the cutter body (1), and the second cutting edge (7) coincides with the first cutting edge (6) to cut the sewing thread.

9. The double-acting knife sewing machine according to claim 7, wherein: The presser foot lifting mechanism (19) includes a cam (191), a link structure (192), and a presser bar structure (193). The lower part of the link structure (192) acts on the cam (191). The other end of the link structure (192) acts on the presser bar structure (193). The lower part of the presser bar structure (193) is provided with the presser foot (23). The cam (191) is fixed to the motor shaft of the second driving motor (182), so as to drive the presser foot (23) to perform lifting and pressing operations.

10. The double-acting knife sewing machine according to claim 7, wherein: The feeding mechanism (20) includes a tooth carrier (201), feed teeth (202) provided on the tooth carrier (201), a lifting tooth seat (203), a tooth replacement seat (204), and a tooth replacement driving member (205). The lifting tooth seats (203) and the tooth replacement seats (204) are respectively hinged to both ends of the tooth carrier (201) in one-to-one correspondence. The lifting tooth seats (203) drive the tooth carrier (201) to move up and down. The tooth replacement seat (204) is provided with a transmission assembly (21). The transmission assembly (21) includes a tooth replacement bracket (211), a feeding link (212), and a feeding crank (213). The tooth replacement seat (204) is arranged on the tooth replacement bracket (211). The crank end of the tooth replacement bracket (211) is hinged to the end of the feeding link (212), and the other end of the feeding link (212) is hinged to the end of the feeding crank (213). The other end of the feeding crank (213) is connected to the driving end of the tooth replacement driving member (205). The tooth replacement driving member (205) drives the feeding crank (213) to swing, so as to drive the tooth carrier (201) to swing left and right.

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