A thread-cutting transmission mechanism for a sewing machine and a sewing machine

Abstract

This utility model provides a thread-cutting transmission mechanism for a sewing machine and a sewing machine in general, belonging to the technical field of sewing machine equipment. It solves the technical problem of stabilizing the thread-cutting transmission in a sewing machine. The thread-cutting transmission mechanism includes a swing arm, a connecting piece, and a push rod. The outer end of the swing arm is directly or indirectly hinged to the machine housing, forming a hinge point one. The middle end of the swing arm is hinged to a power source, forming a hinge point two. The power source drives hinge point two to move, causing the swing arm to swing around hinge point one. The connecting piece has a through groove, and the inner end of the swing arm has a pin. The pin is connected to the through groove and can slide within the groove. The connecting piece is fixedly connected to the inner end of the push rod, and the outer end of the push rod is connected to the thread-cutting mechanism. In this utility model, the swing arm swings, causing the pin to slide within the through groove of the connecting piece, which in turn moves the push rod fixedly connected to the connecting piece, thus moving the thread-cutting mechanism. The sliding of the pin within the through groove ensures stable transmission.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machine equipment, and relates to a thread-cutting transmission mechanism for a sewing machine and a sewing machine. Background Technology

[0002] The thread trimming mechanism on a sewing machine is a very important component, and it is a typical example of the automation of sewing machines. Initially, thread trimming on industrial sewing machines was done manually, which greatly affected the production efficiency of sewing machines. With the development of sewing machines to the era of computerized sewing machines, automatic thread trimming function has become almost standard, and the production efficiency of sewing machines has been improved while the degree of automation has increased.

[0003] Patent application number 202023102104.3 discloses a thread-cutting mechanism for a sewing machine. The sewing machine includes a machine base, and the thread-cutting mechanism includes a motor fixed on the machine base, a worm gear mounted on the output shaft of the motor, a worm that interacts with the worm gear, and a moving blade rotatably connected to the machine base. A connecting rod is provided between the worm and the moving blade. The rotation of the worm can cause the connecting rod to drive the moving blade to swing and cooperate with the fixed blade to form a shearing motion.

[0004] The wire-cutting mechanism described in the aforementioned literature reduces wire-cutting errors and improves wire-cutting accuracy, but it still has shortcomings. Its structure is relatively complex, and the worm gear transmission is not stable enough. Summary of the Invention

[0005] This utility model addresses the aforementioned problems in existing technologies by providing a thread-cutting transmission mechanism for a sewing machine. The technical problem this utility model aims to solve is how to stabilize the thread-cutting transmission of a sewing machine.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A thread-cutting transmission mechanism for a sewing machine, the sewing machine comprising a housing, a power source, and a thread-cutting mechanism, wherein the housing is fixedly connected to the power source, characterized in that the thread-cutting transmission mechanism comprises a swing arm, a connecting member, and a push rod, wherein the outer end of the swing arm is directly or indirectly hinged to the housing to form a hinge point one, the middle end of the swing arm is hinged to the power source to form a hinge point two, and the swing arm swings around hinge point one by being driven to move hinge point two by the power source; the connecting member has a through groove, the inner end of the swing arm is provided with a pin, the pin is connected to the through groove and can slide within the through groove; the connecting member is fixedly connected to the inner end of the push rod, and the outer end of the push rod is connected to the thread-cutting mechanism.

[0008] Its working principle is as follows: The outer end of the swing arm is directly or indirectly hinged to the housing, so that the swing arm can swing relative to the first hinge point by the power source through the second hinge point. This structure is stable. The inner end of the swing arm has a pin. The swing arm swing drives the pin to slide in the through groove on the connector, which drives the push rod fixedly connected to the connector to move, so that the wire cutting mechanism moves. The transmission method is stable because the pin slides in the through groove. The transmission is achieved only through the swing arm, the connector and the push rod, which improves the stability of the transmission and has high transmission efficiency.

[0009] In the thread-cutting transmission mechanism of the sewing machine described above, the connecting component includes a connecting block one and a connecting block two. The connecting block one and the connecting block two are an integral structure or a fixed connection. The through groove is located on the connecting block one, and the through groove is an inclined groove or a straight groove.

[0010] Connecting block one and connecting block two are an integral structure for fixed connection, which improves the stability of the structure. The through groove is an inclined groove, which makes it easier for the swing rod to slide more smoothly in the through groove, or the through groove is a straight groove, which makes the two slide stably.

[0011] In the thread-cutting transmission mechanism of the sewing machine described above, the inclination angle of the through groove relative to the vertical direction is between 5° and 25°, and the included angle between the through groove and the push rod is between 65° and 85°.

[0012] The through groove is between 5° and 25°, which can reduce the torque of the swing arm and improve the stability and efficiency of the transmission. The angle between the through groove and the push rod is between 65° and 85°. This tilt angle facilitates the swing arm to swing in the through groove and improves the stability of the transmission.

[0013] In the thread-cutting transmission mechanism of the sewing machine described above, the second connecting block is located below and perpendicular to the first connecting block. The second connecting block is threaded onto the push rod. The second connecting block is L-shaped. A return spring is connected to the lower end of the second connecting block. The other end of the return spring is fixed to the machine housing.

[0014] The connecting block 2 is threaded onto the push rod, which improves the connection stability between the connecting block 2 and the push rod. The connecting block 2 is L-shaped, which reduces the space required, and a return spring is connected to the lower end, which makes the spring transmission stable. The return spring can reset the push rod after it has moved.

[0015] In the thread-cutting transmission mechanism of the sewing machine described above, the second connecting block is threadedly connected to the push rod, and the first connecting block is perpendicular to the push rod.

[0016] Connecting block two is threadedly connected to the push rod. This connection structure is stable and facilitates disassembly between the two. Connecting block one is perpendicular to the push rod, which improves the stability of the transmission.

[0017] In the thread-cutting transmission mechanism of the sewing machine described above, the swing arm includes a horizontal part one, a vertical part and a horizontal part two. The horizontal part one and the horizontal part two are parallel to each other. The vertical part is located between the horizontal part one and the horizontal part two and is perpendicular to the horizontal part one and the horizontal part two. The vertical part is connected to a power source and can be driven to move by the power source.

[0018] The vertical part is located between and perpendicular to the horizontal part one and the horizontal part two, which improves the stability of the vertical part. The power source drives the vertical part to move, which in turn drives the horizontal part one and the horizontal part two to move as well. The vertical part is located in the middle, which improves the stability of the transmission.

[0019] In the thread-cutting transmission mechanism of the sewing machine described above, a fixing plate 1 is fixedly connected to the power source, and a fixing plate 2 is fixedly connected to one side of the outer end of the fixing plate 1 by means of a thread, and the fixing plate 2 is fixedly connected to the machine casing.

[0020] Fixed plate one allows the power source to be stably connected inside fixed plate one. Fixed plate two is threadedly connected to fixed plate one. This connection is stable and easy to disassemble, allowing the power source to be adjusted in time. Fixed plate two is fixed to the housing, fixing the power source inside the housing and improving the stability of the transmission.

[0021] In the thread-cutting transmission mechanism of the sewing machine described above, the power source includes an electromagnet, a cylinder, or a motor.

[0022] Another objective of this invention is to provide a sewing machine that includes any of the above-mentioned thread-cutting transmission mechanisms.

[0023] Compared with the prior art, the advantages of this utility model are as follows:

[0024] 1. The swing arm of this transmission mechanism drives the pin to slide in the through groove on the connecting part, which in turn drives the push rod fixedly connected to the connecting part to move, thus moving the wire cutting mechanism. The transmission method is stable because the pin slides in the through groove.

[0025] 2. The connecting block one and connecting block two of this transmission mechanism are an integral structure for fixed connection, which improves the stability of the structure. The through groove is an inclined groove, which makes it easier for the swing rod to slide more smoothly in the through groove, or the through groove is a straight groove, which makes the two slide stably.

[0026] 3. The through groove of this transmission mechanism is between 5° and 25°, which can reduce the torque of the swing arm and improve the stability and efficiency of the transmission. The included angle between the through groove and the push rod is between 65° and 85°. This tilt angle facilitates the swing arm to swing in the through groove and improves the stability of the transmission. Attached Figure Description

[0027] Figure 1 This is a partial structural diagram of the thread-cutting transmission mechanism of this sewing machine.

[0028] Figure 2 This is a schematic diagram of the thread-cutting transmission mechanism of this sewing machine.

[0029] Figure 3 This is a schematic diagram of the connecting parts in the thread-cutting transmission mechanism of this sewing machine.

[0030] In the diagram, 1 is the housing; 2 is the power source; 3 is the rocker arm; 4 is the connector; 5 is the push rod; 6 is the through groove; 7 is the pin; 8 is the wire cutting mechanism; 9 is the first connecting block; 10 is the second connecting block; 11 is the return spring; 12 is the vertical part; 13 is the first horizontal part; 14 is the vertical part; 15 is the first fixing plate; 16 is the second fixing plate; 17 is the first hinge point; 18 is the second hinge point. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] Example 1

[0033] like Figure 1 and 2 As shown, the sewing machine includes a housing 1, a power source 2, and a thread-cutting mechanism 8. The housing 1 is fixedly connected to the power source 2. The thread-cutting transmission mechanism includes a swing arm 3, a connecting piece 4, and a push rod 5. The outer end of the swing arm 3 is directly or indirectly hinged to the housing 1 to form a hinge point 17. The middle end of the swing arm 3 is hinged to the power source 2 to form a hinge point 18. The power source 2 drives the hinge point 18 to move, causing the swing arm 3 to swing around the hinge point 17. The connecting piece 4 has a through groove 6. The inner end of the swing arm 3 is provided with a pin 7. The pin 7 is connected to the through groove 6 and can slide in the through groove 6. The connecting piece 4 is fixedly connected to the inner end of the push rod 5. The outer end of the push rod 5 is connected to the thread-cutting mechanism 8. The outer end of the swing arm 3 is directly or indirectly hinged to the housing 1, so that the swing arm 3 can swing relative to the hinge point 17 by the power source 2 driving the hinge point 2 18. This structure is stable. The inner end of the swing arm 3 has a pin 7. The swing arm 3 swings and drives the pin 7 to slide in the through groove 6 on the connector 4, which drives the push rod 5 fixedly connected to the connector 4 to move, so that the wire cutting mechanism 8 moves. The transmission method is stable and is achieved by only the swing arm 3, the connector 4 and the push rod 5, which improves the stability of the transmission and has high transmission efficiency.

[0034] like Figure 1 and 3As shown, the connector 4 includes a first connector 9 and a second connector 10. The first connector 9 and the second connector 10 are either an integral structure or a fixed connection. The through groove 6 is located on the first connector 9, and the through groove 6 can be either an inclined groove or a straight groove. The integral structure of the first connector 9 and the second connector 10, which is a fixed connection, improves the stability of the structure. The inclined groove 6 facilitates smoother sliding of the rocker arm 3 within the through groove 6, or the straight groove 6 allows for stable sliding between the two components.

[0035] like Figure 1 and 3 As shown, the inclination angle of the through groove 6 relative to the vertical direction ranges from 5° to 25°, and the included angle between the through groove 6 and the push rod 5 ranges from 65° to 85°. The through groove 6's inclination angle of 5° to 25° reduces the torque of the swing rod 3, improving the stability and efficiency of the transmission. The included angle between the through groove 6 and the push rod 5, ranging from 65° to 85°, facilitates the swing rod 3's oscillation within the through groove 6, further enhancing transmission stability.

[0036] like Figure 1 As shown, connecting block 2 10 is located below and perpendicular to connecting block 1 9. Connecting block 2 10 is threaded onto push rod 5. Connecting block 2 10 is L-shaped, and a return spring 11 is connected to the lower end of connecting block 2 10. The other end of the return spring 11 is fixed to the housing 1. The threaded connection of connecting block 2 10 to push rod 5 improves the connection stability between connecting block 2 10 and push rod 5. The L-shaped design of connecting block 2 10 reduces the usable space, and the return spring 11 at the lower end stabilizes the spring transmission. The return spring 11 can reset push rod 5 after it has moved.

[0037] like Figure 1 and 3 As shown, connecting block 2 10 is threadedly connected to push rod 5, and connecting block 1 9 is perpendicular to push rod 5. The threaded connection between connecting block 2 10 and push rod 5 provides a stable connection structure and facilitates disassembly between the two. The perpendicularity of connecting block 1 9 to push rod 5 improves the stability of the transmission.

[0038] like Figure 1 As shown, the rocker arm 3 includes a horizontal section 13, a vertical section 12, and a horizontal section 2 14. The horizontal sections 13 and 2 are parallel, and the vertical section 12 is located between them, perpendicular to both. The vertical section 12 is connected to the power source 2 and can be driven to move by the power source 2. The vertical section 12's position between and perpendicular to the horizontal sections 13 and 2, respectively, improves its stability. The power source 2's movement of the vertical section 12 also moves the horizontal sections 13 and 2, with the vertical section 12 positioned in the middle, further enhancing transmission stability.

[0039] like Figure 2As shown, a fixing plate 15 is fixedly connected to the power source 2. A fixing plate 16 is threadedly connected to one side of the outer end of the fixing plate 15. The fixing plate 16 is fixedly connected to the housing 1. The fixing plate 15 allows the power source 2 to be stably connected inside the fixing plate 15. The fixing plate 16 is threadedly connected to the fixing plate 15. This connection is stable and easy to disassemble, allowing the power source 2 to be adjusted in time. The fixing plate 16 is fixed to the housing 1, fixing the power source 2 inside the housing 1 and improving the stability of the transmission.

[0040] like Figure 1 As shown, power source 2 includes an electromagnet, a cylinder, or a motor.

[0041] Example 2

[0042] The general content of this embodiment is the same as that of embodiment 1, except that: in this embodiment, a sewing machine is provided, including the thread cutting transmission mechanism of any of the sewing machines in embodiment 1.

[0043] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A thread trimming drive mechanism of a sewing machine, said sewing machine comprising a machine housing (1), a power source (2) and a thread trimming mechanism (8), said machine housing (1) being fixedly connected with said power source (2), characterized in that, The wire-cutting transmission mechanism includes a swing arm (3), a connecting piece (4), and a push rod (5). The outer end of the swing arm (3) is directly or indirectly hinged to the housing (1) to form a hinge point one (17). The middle end of the swing arm (3) is hinged to the power source (2) to form a hinge point two (18). The power source (2) drives the hinge point two (18) to move, causing the swing arm (3) to swing around the hinge point one (17). The connecting piece (4) has a through groove (6). The inner end of the swing arm (3) is provided with a pin (7). The pin (7) is connected to the through groove (6) and can slide in the through groove (6). The connecting piece (4) is fixedly connected to the inner end of the push rod (5). The outer end of the push rod (5) is connected to the wire-cutting mechanism (8).

2. A thread trimming drive mechanism for a sewing machine as defined in claim 1, wherein The connector (4) includes a first connector (9) and a second connector (10). The first connector (9) and the second connector (10) are an integral structure or a fixed connection. The through groove (6) is located on the first connector (9). The through groove (6) is an inclined groove or a straight groove.

3. The thread trimming drive mechanism of claim 1 wherein, The inclination angle of the through groove (6) relative to the vertical direction is between 5° and 25°, and the included angle between the through groove (6) and the push rod (5) is between 65° and 85°.

4. The thread trimming drive mechanism of claim 2 wherein, The second connecting block (10) is located below and perpendicular to the first connecting block (9). The second connecting block (10) is threaded onto the push rod (5). The second connecting block (10) is L-shaped. A return spring (11) is connected to the lower end of the second connecting block (10). The other end of the return spring (11) is fixed to the housing (1).

5. The thread trimming drive mechanism of claim 2 wherein, The second connecting block (10) is threadedly connected to the push rod (5), and the first connecting block (9) is perpendicular to the push rod (5).

6. The thread trimming drive mechanism of a sewing machine according to claim 1, wherein The swing arm (3) includes a horizontal part one (13), a vertical part (12) and a horizontal part two (14). The horizontal part one (13) and the horizontal part two (14) are parallel. The vertical part (12) is located between the horizontal part one (13) and the horizontal part two (14). The vertical part (12) is perpendicular to the horizontal part one (13) and the horizontal part two (14). The vertical part (12) is connected to the power source (2) and can be driven to move by the power source (2).

7. The thread trimming drive mechanism of a sewing machine according to claim 1, wherein A fixing plate 1 (15) is fixedly connected to the power source (2), and a fixing plate 2 (16) is fixedly connected to one side of the outer end of the fixing plate 1 (15) by means of a thread. The fixing plate 2 (16) is fixedly connected to the housing (1).

8. The thread trimming drive mechanism of a sewing machine according to claim 1, wherein The power source (2) includes an electromagnet, a cylinder, or a motor.

9. A sewing machine characterized by comprising: The sewing machine includes the thread-cutting transmission mechanism of the sewing machine according to any one of claims 1-8.

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