Thread trimming mechanism of sewing machine

Abstract

The utility model discloses a trimming mechanism of a sewing machine, which relates to the technical field of sewing machines and comprises a movable mounting plate, a motor connected to one side of the top end of the movable mounting plate, a turntable connected to the output end of the motor, a fixed column connected to the outer wall of one side of the turntable, and a guide slide rail slidably connected to the outer wall of the fixed column. The outer wall of one side of the guide sliding rail is connected with a push rod, the end, away from the guide sliding rail, of the push rod is rotationally connected with a first connecting rod, the outer wall of one side of the first connecting rod is provided with a first sliding groove, and the end, away from the push rod, of the first sliding groove is slidably connected with a second connecting rod. According to the sewing thread cutting device, the cutting length can be controlled by rotating the threaded rod for adjustment, sewing threads with different lengths are possibly needed for different styles and specifications, the shearing assembly is adjusted to the corresponding position according to the specific production requirement, it is ensured that the length of the sewing threads cut off each time meets the requirement, and the production flexibility is improved.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a thread-cutting mechanism for a sewing machine. Background Technology

[0002] In today's textile and apparel manufacturing, home textile processing, and various fabric product production fields, sewing machines play an indispensable role as a basic and key production equipment. With the continuous growth of market demand, the requirements for production efficiency are also gradually increasing.

[0003] In existing technologies, sock production involves multiple processes such as toe stitching and heel reinforcement stitching. After traditional sewing machines complete the stitching, workers typically need to manually cut the thread with scissors. Workers need to estimate the required thread length, which may result in uneven thread breakage. Uneven thread breakage not only affects the product's appearance but may also cause a series of problems in the subsequent thread burning process. For example, when the thread breakage is uneven, some thread ends may not be completely burned due to being too long, or they may melt directly into large clumps due to being too short. These clumps are not only difficult to remove but may also damage the fabric, affecting the product's durability and comfort.

[0004] In view of the above, this application is hereby submitted. Utility Model Content

[0005] The purpose of this invention is to provide a thread-cutting mechanism for a sewing machine to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a thread-cutting mechanism for a sewing machine, including a movable mounting plate. A motor is connected to one side of the top of the movable mounting plate, and a turntable is connected to the output end of the motor. A fixed column is connected to one outer wall of the turntable, and a guide rail is slidably connected to the outer wall of the fixed column. A push rod is connected to one outer wall of the guide rail, and a first connecting rod is rotatably connected to the end of the push rod away from the guide rail. A first groove is formed on one outer wall of the first connecting rod, and a second connecting rod is slidably connected to the end of the first connecting rod away from the push rod. A second groove is formed at one end of the second connecting rod, and a third groove is formed on the side of the second connecting rod away from the second groove. Sliding columns are slidably connected to the first and second connecting rods through the inner walls of the first and third grooves, and a cutter is fixedly connected to the bottom end of each sliding column.

[0007] Furthermore, a movable block is fixedly connected to one outer wall of the movable mounting plate, a threaded rod is threadedly connected to the inner wall of the bottom end of the movable block, and fixed blocks are rotatably connected to both ends of the threaded rod. A fixed mounting plate is slidably connected to one outer wall of the movable mounting plate, and lines are sleeved on the inner wall of the fixed mounting plate.

[0008] Furthermore, the cutting tools are made of wear-resistant material, and cutting heads are installed on opposite sides of both tools.

[0009] Furthermore, when the motor starts, the turntable and the fixed column will rotate synchronously, and the fixed column will slide on the inner wall of the guide rail.

[0010] Furthermore, a first pivot is installed in the middle of the first link, and the first link is rotatably connected to the movable mounting plate through the first pivot.

[0011] Furthermore, one side of the second link is rotatably connected to the first link via the second slide groove, and a second rotating shaft is installed on the side of the second link away from the second slide groove. The second link is rotatably connected to the movable mounting plate via the second rotating shaft.

[0012] Furthermore, the side of the motor furthest from the output end is fixedly connected to the movable mounting plate, while one side of the outer wall of the two cutters is slidably connected to one side of the outer wall of the movable mounting plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The cutting length can be controlled by rotating the threaded rod. Different styles and specifications may require different lengths of suture thread. According to specific production needs, the cutting component can be adjusted to the corresponding position to ensure that the suture thread length cut each time meets the requirements, thus improving production flexibility.

[0015] 2. By controlling the thread cutting length, the amount of molten thread that clumps due to excessively long or short threads during the slacking process is reduced. This lowers the difficulty and cost of subsequent processing, avoids potential damage to clothing fabrics caused by molten thread clumps, and improves the product's durability and comfort. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a thread-cutting mechanism for a sewing machine.

[0017] Figure 2 This is a schematic diagram of the push component in the thread-cutting mechanism of a sewing machine;

[0018] Figure 3 This is a schematic diagram showing the connection of two connecting rods in the thread-cutting mechanism of a sewing machine.

[0019] Figure 4 This is a schematic diagram of the structure of the blade in the thread-cutting mechanism of a sewing machine;

[0020] Figure 5 A schematic diagram of the back structure of a thread-cutting mechanism for a sewing machine;

[0021] Figure 6This is a schematic diagram of the displacement component in the thread-cutting mechanism of a sewing machine.

[0022] In the diagram: 1. Movable mounting plate; 2. Motor; 3. Turntable; 4. Fixed column; 5. Guide rail; 6. Push rod; 7. First connecting rod; 8. First slide groove; 9. Second connecting rod; 10. Second slide groove; 11. Third slide groove; 12. Sliding column; 13. Cutting tool; 14. Fixed block; 15. Threaded rod; 16. Moving block; 17. Fixed mounting plate; 18. Line. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-6 This utility model provides a technical solution: a thread-cutting mechanism for a sewing machine, including a movable mounting plate 1. A motor 2 is connected to one side of the top of the movable mounting plate 1, and a turntable 3 is connected to the output end of the motor 2. The motor 2 provides power to the turntable 3. When the motor 2 starts, the turntable 3 will rotate synchronously. A fixed column 4 is connected to one outer wall of the turntable 3. The fixed column 4 rotates around the center of the turntable 3 as the turntable 3 rotates. A guide rail 5 is slidably connected to the outer wall of the fixed column 4. When the fixed column 4 rotates, it will slide on the inner wall of the guide rail 5, thereby pushing the guide rail 5 to perform reciprocating linear motion. A push rod 6 is connected to one outer wall of the guide rail 5. The push rod 6 will perform reciprocating linear motion synchronously with the movement of the guide rail 5. A first connecting rod 7 is rotatably connected to the end of the push rod 6 away from the guide rail 5. The middle part of the first connecting rod 7 is rotatably connected to the movable mounting plate 1 through a first rotating shaft. When the push rod 6 moves backward, it will move in a reciprocating linear motion. During the linear motion, the first connecting rod 7 will swing around the first pivot in the middle. A first groove 8 is provided on the outer wall of one side of the first connecting rod 7. The end of the first connecting rod 7 away from the push rod 6 is slidably connected to the second connecting rod 9. A second groove 10 is provided on one end of the second connecting rod 9. A third groove 11 is provided on the side of the second connecting rod 9 away from the second groove 10. The first connecting rod 7 will interact with the second connecting rod 9, causing the second connecting rod 9 to swing around the second pivot connected to the movable mounting plate 1. The first connecting rod 7 and the second connecting rod 9 are slidably connected to sliding columns 12 through the inner walls of the first groove 8 and the third groove 11. A cutter 13 is fixedly connected to the bottom end of each sliding column 12. During the swinging of the first connecting rod 7 and the second connecting rod 9, the sliding column 12 will slide in the first groove 8 and the third groove 11. The sliding of the sliding column 12 will drive the two cutters 13 to move in opposite or opposite linear motions, thereby realizing the wire cutting action.

[0025] See Figure 1 , Figure 5 , Figure 6 A movable block 16 is fixedly connected to one side of the outer wall of the movable mounting plate 1. A threaded rod 15 is threadedly connected to the inner wall of the bottom end of the movable block 16. When the threaded rod 15 rotates, the movable block 16 will move linearly on the outer wall of the threaded rod 15, thereby driving the movable mounting plate 1 to move. Fixed blocks 14 are rotatably connected to both ends of the threaded rod 15. The fixed blocks 14 provide installation and rotation support points for the threaded rod 15, ensuring that the threaded rod 15 can rotate freely around its own axis in a fixed position.

[0026] See Figure 1 , Figure 5 A fixed mounting plate 17 is slidably connected to one outer wall of the movable mounting plate 1. A line 18 is sleeved on the inner wall of the fixed mounting plate 17. The fixed mounting plate 17 provides support and a guide channel for the line 18, ensuring that the line 18 can be conveyed along a predetermined path during the sewing process. At the same time, it serves as a sliding reference for the movable mounting plate 1, providing a reference for the movement of the movable mounting plate 1 and ensuring the straightness and accuracy of the movement of the movable mounting plate 1.

[0027] participate Figure 4 The blade 13 is made of wear-resistant material. Cutting heads are installed on opposite sides of the two blades 13. The wear-resistant material extends the service life of the blades 13, reduces the frequency of blade replacement, and lowers production and maintenance costs. At the same time, the cutting heads can quickly cut the lines 18, improving the efficiency of cutting the lines.

[0028] See Figure 1 , Figure 4 The side of motor 2 away from the output end is fixedly connected to the movable mounting plate 1. Motor 2 provides power for the movement of the cutter 13. One outer wall of the two cutters 13 is slidably connected to one outer wall of the movable mounting plate 1. The movable mounting plate 1 serves as a mounting platform, allowing motor 2 and cutter 13 to be adjusted in position as a whole.

[0029] Working principle: When wire cutting is required, motor 2 starts, and the output end of motor 2 drives turntable 3 to rotate. The fixed column 4 on turntable 3 moves in a circular motion in sync. The fixed column 4 slides on the inner wall of guide rail 5, pushing guide rail 5 to move in a reciprocating linear motion, which drives push rod 6 to move in a reciprocating linear motion in sync. Push rod 6 then pushes the first connecting rod 7 to swing around the first rotating shaft. The first connecting rod 7 and the second connecting rod 9 swing in sync. The two sliding columns 12 slide in the first sliding groove 8 and the third sliding groove 11, driving the two cutters 13 to slide towards each other on one side of the outer wall of the movable mounting plate 1, cutting the line 18 located between them. By rotating the threaded rod 15, the moving block 16 will move in a straight line along the threaded rod 15, thereby driving the movable mounting plate 1 to move and realize the adjustment of the overall position of the wire cutting mechanism to adapt to different working needs.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A thread-cutting mechanism for a sewing machine, comprising a movable mounting plate (1), characterized in that: A motor (2) is connected to one side of the top of the movable mounting plate (1). A turntable (3) is connected to the output end of the motor (2). A fixed column (4) is connected to one side of the outer wall of the turntable (3). A guide rail (5) is slidably connected to the outer wall of the fixed column (4). A push rod (6) is connected to one side of the outer wall of the guide rail (5). A first connecting rod (7) is rotatably connected to the end of the push rod (6) away from the guide rail (5). A first groove (8) is formed on one side of the outer wall of the first connecting rod (7). The first connecting rod (7) is slidably connected to the second connecting rod (9) at the end away from the push rod (6). The second connecting rod (9) has a second groove (10) at one end and a third groove (11) at the side away from the second groove (10). The first connecting rod (7) and the second connecting rod (9) are slidably connected to sliding columns (12) through the inner walls of the first groove (8) and the third groove (11). Each sliding column (12) has a cutter (13) fixedly connected to its bottom end.

2. The thread-cutting mechanism of a sewing machine as described in claim 1, characterized in that: A movable block (16) is fixedly connected to one side of the outer wall of the movable mounting plate (1), and a threaded rod (15) is threadedly connected to the bottom inner wall of the movable block (16), and a fixed block (14) is rotatably connected to both ends of the threaded rod (15).

3. The thread-cutting mechanism of a sewing machine as described in claim 2, characterized in that: A fixed mounting plate (17) is slidably connected to one side of the outer wall of the movable mounting plate (1), and the inner wall of the fixed mounting plate (17) is fitted with a line (18).

4. The thread-cutting mechanism of a sewing machine as described in claim 3, characterized in that: The first connecting rod (7) is equipped with a first rotating shaft in the middle, and the first connecting rod (7) is rotatably connected to the movable mounting plate (1) through the first rotating shaft.

5. The thread-cutting mechanism of a sewing machine as described in claim 4, characterized in that: One side of the second connecting rod (9) is rotatably connected to the first connecting rod (7) through the second slide groove (10). A second rotating shaft is installed on the side of the second connecting rod (9) away from the second slide groove (10). The second connecting rod (9) is rotatably connected to the movable mounting plate (1) through the second rotating shaft.

6. The thread-cutting mechanism of a sewing machine as described in claim 5, characterized in that: The side of the motor (2) away from the output end is fixedly connected to the movable mounting plate (1), and the outer wall of one side of the two cutting tools (13) is slidably connected to the outer wall of one side of the movable mounting plate (1).

7. The thread-cutting mechanism of a sewing machine as described in claim 6, characterized in that: The cutting tool (13) is made of wear-resistant material, and a cutting head is installed on one side of each of the two cutting tools (13) opposite to each other.

8. The thread-cutting mechanism of a sewing machine as described in claim 7, characterized in that: When the motor (2) is started, the turntable (3) and the fixed column (4) will rotate synchronously, and the fixed column (4) will slide on the inner wall of the guide rail (5).

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