Magnetic thread changing device for sewing machine

Abstract

The utility model relates to sewing equipment technical field discloses a kind of magnetic sewing equipment thread changing thread counter, including T-shaped block, the outer wall of T-shaped block is provided with magnetic attraction metering display mechanism, the magnetic attraction metering display mechanism is used to display real-time on-line usage meter, the rear side of T-shaped block is provided with tension adjusting mechanism, and the tension adjusting mechanism is used to fix on-line tension;The magnetic attraction metering display mechanism includes rotating wheel type meter, and the outer wall of rotating wheel type meter is fixedly connected in the outer wall left side of T-shaped block.In the utility model, by guiding the on-line in the limit post to rotate around rotating wheel clockwise, when sewing equipment operates, on-line traction pulling force drives rotating wheel to rotate, because rotating wheel and rotating wheel type meter are coaxial fixed, its rotation number is converted into metering number by gear transmission, and is displayed by rotating wheel type meter in real time, and it is convenient for worker to check on-line usage meter.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and in particular to a magnetic sewing equipment thread changer. Background Technology

[0002] The magnetic sewing equipment thread counter is an auxiliary device used in the sewing equipment field. Its core function is to predict the usage of the lower thread by measuring the length of the upper thread used during the sewing process, thereby providing an accurate reference for the replacement of the bobbin thread in the sewing operation.

[0003] Early thread counting devices in sewing equipment relied on mechanical structures to achieve basic counting functions, judging the bobbin thread status through simple manual observation. This method not only lacked accurate measurement but also, due to the absence of an automatic warning mechanism, made it difficult to precisely control the timing of bobbin thread replacement, frequently resulting in stitch defects and high defect rates. With technological advancements, some existing thread counting devices have attempted to improve these issues by optimizing transmission logic and thread clamping methods. They have adopted non-direct contact transmission designs to replace traditional mechanical engagement, reducing the impact of mechanical wear on measurement. Simultaneously, they have introduced elastic adjustment structures to stabilize thread tension, improving counting reliability to some extent. However, current… The proposed solution still has fundamental flaws. Its transmission system relies on a physical contact metering principle, which inevitably leads to metering deviations due to component wear after long-term operation. The fixing method uses a traditional rigid connection structure, which is prone to displacement due to equipment vibration, thus affecting data accuracy. Furthermore, the counting system lacks an automated reset mechanism, requiring manual recalibration after each thread change, which is cumbersome and inefficient. Since the existing device cannot provide real-time feedback on the remaining bobbin thread through dynamic data, workers have to rely on experience to repeatedly disassemble and reassemble the bobbin to confirm the amount. This not only prolongs downtime but also causes unstable quality at the stitch joints due to frequent thread changes, ultimately resulting in a high rate of defective products. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a magnetic sewing equipment thread changer, which aims to improve the problem in the prior art that the remaining bobbin thread cannot be fed back in real time through dynamic data, and that the bobbin needs to be repeatedly disassembled and reassembled for confirmation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a magnetic sewing equipment thread changer, comprising a T-shaped block, wherein a magnetic metering display mechanism is provided on the outer wall of the T-shaped block, the magnetic metering display mechanism being used to display the number of meters of thread used in real time, and a tension adjustment mechanism being provided on the rear side of the T-shaped block, the tension adjustment mechanism being used to fix the tension of the thread.

[0006] The magnetic metering display mechanism includes a rotary meter, the outer wall of which is fixedly connected to the left side of the outer wall of the T-shaped block. The right end of the rotary meter passes through the right side of the T-shaped block and is fixedly connected to a rotating wheel. Multiple limiting posts are rotatably connected to the right side of the T-shaped block. A reset button is fixedly connected to the front side of the outer wall of the rotary meter, and a magnetic base is fixedly connected to the bottom end of the T-shaped block.

[0007] As a further description of the above technical solution:

[0008] The tension adjustment mechanism includes a fixing bar, the bottom end of which is fixedly connected to the rear side of the T-block. An adjusting screw is provided on the right side of the fixing bar. The left side of the outer wall of the adjusting screw passes through the left side of the fixing bar and is threaded with a fixing nut. An inclined U-shaped plate is provided on the right side of the fixing bar. An extrusion disc is provided on the right side of the inclined U-shaped plate. The left side of the outer wall of the adjusting screw passes through the inner wall of the extrusion disc and the inclined U-shaped plate in sequence. A spring is fixedly connected to the left side of the adjusting screw. A conical extrusion disc is fixedly connected to the left side of the spring. The fixing bar of the tension adjustment mechanism is fixed to the rear side of the T-block by welding or bolting. The inclined U-shaped plate and the fixing bar are detachably connected to each other to allow for the replacement of extrusion discs of different specifications.

[0009] As a further description of the above technical solution:

[0010] The magnetic base is made of neodymium iron boron permanent magnet material, and the contact area between its adsorption surface and the metal surface of the sewing equipment is not less than 20 cm². 2 This is to ensure that the device remains stable and fixed when the equipment vibrates.

[0011] As a further description of the above technical solution:

[0012] The outer circumferential surface of the rotary meter is provided with an anti-slip rubber layer. The ratio of the diameter of the rotating wheel to the diameter of the upper line is 50:1 to 80:1 to ensure the synchronicity of the upper line driving the rotating wheel to rotate and improve the metering accuracy.

[0013] As a further description of the above technical solution:

[0014] The reset button has a pressing stroke of 2-3mm and is equipped with an elastic reset structure inside. When pressed, it can drive the counting gear of the rotary meter to zero, realizing one-button reset of the measurement data.

[0015] As a further description of the above technical solution:

[0016] The spring has an elastic coefficient of 10-15 N / cm, and the cone angle of the conical extrusion disc is 60°-90°. When the conical extrusion disc is moved by the adjusting screw, a tension of 5-10 N can be applied to the upper wire to ensure the stability of the wire body and to prevent damage to the wire core.

[0017] As a further description of the above technical solution:

[0018] The number of limiting posts is three, and they are arranged in an arc on the wire outlet side of the rotating wheel. They are used to guide the upper wire to wind around the rotating wheel in a clockwise direction, so as to avoid measurement errors caused by the wire winding mess and improve measurement accuracy.

[0019] As a further description of the above technical solution:

[0020] The inclined U-shaped plate has an inclination angle of 15°-30°, and its opening direction is consistent with the inlet direction of the upper wire. This allows the tension to be adaptively adjusted through the gap formed by the extrusion plate and the conical extrusion plate when the upper wire passes through, while reducing friction loss of the wire.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by guiding the upper thread clockwise around the rotating wheel once under the guidance of the limiting post, when the sewing equipment is running, the pulling force of the upper thread drives the rotating wheel to rotate. Since the rotating wheel is coaxially fixed with the rotary meter, the number of rotations is converted into a metering number through gear transmission, which is displayed in real time by the rotary meter, making it convenient for workers to check the length of the upper thread used. When the bobbin is replaced and the thread is changed, pressing the reset button can drive the counting gear of the rotary meter to zero, thereby resetting the metering number.

[0023] 2. In this utility model, the upper wire passes through the opening of the inclined U-shaped plate and enters the gap between the extrusion plate and the conical extrusion plate. The rotating adjusting screw pushes the conical extrusion plate to move, so that the spring is compressed and generates elastic force, which applies tension to the upper wire. The fixing nut locks the position of the adjusting screw to maintain the tension stability. The inclined U-shaped plate guides the wire and reduces friction loss. When the tension of the upper wire fluctuates, the spring automatically buffers it. The tension is adaptively adjusted by the slight displacement of the conical extrusion plate, thereby fixing the tension of the upper wire. Attached Figure Description

[0024] Figure 1 This is a perspective view of a magnetic sewing equipment thread changer proposed in this utility model;

[0025] Figure 2 This is a front view of a magnetic sewing machine thread changer proposed in this utility model;

[0026] Figure 3 This is a side view of a magnetic sewing machine thread changer proposed in this utility model;

[0027] Figure 4 This is an exploded view of the tension adjustment mechanism of a magnetic sewing machine thread changer proposed in this utility model.

[0028] Legend:

[0029] 1. T-block; 2. Magnetic metering display mechanism; 21. Rotary meter; 22. Rotating wheel; 23. Limiting post; 24. Reset button; 25. Magnetic base; 3. Tension adjustment mechanism; 31. Fixing strip; 32. Adjusting screw; 33. Fixing nut; 34. Inclined U-shaped plate; 35. Extrusion disc; 36. Conical extrusion disc; 37. Spring. Detailed Implementation

[0030] 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.

[0031] Reference Figure 1 , Figure 2 and Figure 3 An embodiment of this utility model is provided: a magnetic sewing equipment thread changer, including a T-shaped block 1, a magnetic metering display mechanism 2 is provided on the outer wall of the T-shaped block 1, the magnetic metering display mechanism 2 is used to display the number of meters of thread used in real time, and a tension adjustment mechanism 3 is provided on the rear side of the T-shaped block 1, the tension adjustment mechanism 3 is used to fix the tension of the thread.

[0032] The magnetic metering display mechanism 2 includes a rotary meter 21. The outer wall of the rotary meter 21 is fixedly connected to the left side of the outer wall of the T-block 1. The right end of the rotary meter 21 passes through the right side of the T-block 1 and is fixedly connected to a rotating wheel 22. The pulling force of the upper thread will drive the rotating wheel 22 to rotate. Since the rotating wheel 22 is coaxially fixed with the rotary meter 21, its rotation number will be converted into a metering number through gear transmission. Multiple limit posts 23 are rotatably connected to the right side of the T-block 1. The upper thread is wound around the rotating wheel 22 clockwise once under the guidance of the limit posts 23. A reset button 24 is fixedly connected to the front side of the outer wall of the rotary meter 21. After changing the thread, pressing the reset button 24 will drive the counting gear of the rotary meter 21 to zero. A magnetic base 25 is fixedly connected to the bottom end of the T-block 1, which is convenient to be attached to a conspicuous position on the sewing equipment.

[0033] Specifically, the thread is wound clockwise around the rotating wheel 22 once under the guidance of the limiting post 23. When the sewing equipment is running, the traction force of the thread will drive the rotating wheel 22 to rotate. Since the rotating wheel 22 is coaxially fixed with the rotary meter 21, the number of rotations will be converted into a metering number through gear transmission, which is displayed in real time by the rotary meter 21 so that the worker can observe the number of meters of thread used. When the bobbin needs to be replaced, after changing the thread, pressing the reset button 24 will drive the counting gear of the rotary meter 21 to zero, thereby resetting the metering number.

[0034] Reference Figure 2 , Figure 3 and Figure 4 The tension adjustment mechanism 3 includes a fixing bar 31, the bottom end of which is fixedly connected to the rear side of the T-block 1. An adjusting screw 32 is located on the right side of the fixing bar 31. The left side of the outer wall of the adjusting screw 32 passes through the left side of the fixing bar 31 and is threaded with a fixing nut 33. The fixing nut 33 locks the position of the adjusting screw 32 to maintain stable tension. An inclined U-shaped plate 34 is located on the right side of the fixing bar 31. The inclined U-shaped plate 34 guides the wire and reduces frictional loss. A pressing plate 35 is located on the right side of the inclined U-shaped plate 34. The left side of the outer wall of the adjusting screw 32 passes through the pressing plate 35 and the inclined U-shaped plate 34 in sequence. A spring 37 is fixedly connected to the left side of the adjusting screw 32 on the inner wall of the inclined U-shaped plate 34. By rotating the adjusting screw 32, the conical extrusion plate 36 can be moved, so that the spring 37 is compressed and generates elastic force, thereby applying tension to the upper wire. The conical extrusion plate 36 is fixedly connected to the left side of the spring 37. The upper wire passes through the opening of the inclined U-shaped plate 34 and enters the gap between the extrusion plate 35 and the conical extrusion plate 36. The fixing strip 31 of the tension adjustment mechanism 3 is fixed to the rear side of the T-shaped block 1 by welding or bolt connection. The inclined U-shaped plate 34 and the fixing strip 31 are detachably connected so as to replace the extrusion plate 35 of different specifications.

[0035] Specifically, the upper wire passes through the opening of the inclined U-shaped plate 34 and enters the gap between the extrusion plate 35 and the conical extrusion plate 36. By rotating the adjusting screw 32, the conical extrusion plate 36 can be moved, causing the spring 37 to be compressed and generate elastic force, thereby applying tension to the upper wire. The fixing nut 33 can lock the position of the adjusting screw 32 to maintain tension stability. The inclined U-shaped plate 34 can guide the wire and reduce friction loss. If the tension of the upper wire fluctuates, the spring 37 will automatically buffer it. The tension is adaptively adjusted by the slight displacement of the conical extrusion plate 36, thereby fixing the tension of the upper wire.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The magnetic base 25 is made of neodymium iron boron permanent magnet material, and its contact area with the metal surface of the sewing equipment is not less than 20 cm². 2To ensure the device remains stable and fixed during equipment vibration, the neodymium iron boron permanent magnet material generates a stable adsorption force, ensuring a firm connection between the device and the sewing equipment, with a minimum distance of 20cm. 2 The increased contact area expands the adsorption force range, disperses the vibration and impact force of the equipment, counteracts the displacement trend, and ensures the stability of the device's installation position. The outer circumference of the rotary meter 21 is provided with an anti-slip rubber layer. The ratio of the diameter of the rotating wheel 22 to the diameter of the upper wire is 50:1 to 80:1 to ensure synchronicity when the upper wire drives the rotating wheel, improving measurement accuracy. The 50:1 to 80:1 diameter ratio amplifies the upper wire's movement, resulting in a significant number of rotations for the rotating wheel 22, facilitating the rotary meter 21's capture of rotational information and its conversion into data. The reset button 24 has a pressing stroke of 2-3 mm and an internal elastic reset structure; pressing it drives the rotary meter 21 to count. The gear zeroing mechanism enables one-button reset of the measurement data. The 2-3mm pressing stroke ensures convenient operation and avoids accidental touches. The elastic reset structure returns the reset button 24 to its initial position after pressing, driving the counting gear to return to its original position and clearing the measurement data to zero. There are three limit posts 23 arranged in an arc on the wire exit side of the rotating wheel 22. They are used to guide the upper wire to wind around the rotating wheel 22 clockwise, avoiding measurement errors caused by messy wire winding and improving measurement accuracy. The three limit posts 23 constrain the upper wire from different angles, forming a guide path. The arc arrangement is adapted to the outer curvature of the rotating wheel 22, guiding the upper wire to fit against the surface of the rotating wheel 22 and wind clockwise, ensuring uniform contact area.

[0037] Specifically, neodymium iron boron permanent magnets generate a stable adsorption force, ensuring a firm connection between the device and the sewing equipment, with a minimum distance of 20cm. 2 The increased contact area expands the adsorption force range, disperses the vibration and impact force of the equipment, counteracts displacement tendencies, and ensures the stability of the device's installation position, providing a foundation for metering and tension adjustment. Furthermore, the anti-slip rubber layer increases the friction between the rotary meter 21 and the upper line, preventing slippage and ensuring that the upper line movement is transmitted to the rotary wheel 22. Simultaneously, the diameter ratio of 50:1 to 80:1 amplifies the upper line movement, causing the rotary wheel 22 to produce a significant number of rotations. This facilitates the rotary meter 21 in capturing rotational information and converting it into data, improving metering accuracy. Additionally, the 2-3mm... The press stroke ensures convenient operation and avoids accidental touches. The elastic reset structure returns the reset button 24 to its initial position after pressing, driving the counting gear to return to its original position and clearing the measurement number to zero. This eliminates the need for manual adjustment and improves line changing efficiency. Meanwhile, the three limit posts 23 constrain the upper line from different angles, forming a guide path. Their arc arrangement matches the outer curvature of the rotating wheel 22, guiding the upper line to fit against the surface of the rotating wheel 22 and wind clockwise. This ensures uniform contact area, prevents uneven force on the rotating wheel 22 due to upper line winding deviation, avoids measurement data deviation, and improves measurement accuracy.

[0038] Reference Figure 1 , Figure 2 and Figure 4 The spring 37 has an elastic coefficient of 10-15 N / cm, and the conical extrusion disc 36 has a cone angle of 60°-90°. When the conical extrusion disc 36 is moved by adjusting the screw 32, a tension of 5-10 N can be applied to the upper wire to ensure the stability of the wire body and prevent damage to the wire core. The elastic coefficient of 0-15 N / cm allows the spring 37 to generate a moderate elastic force. When the adjusting screw 32 pushes the conical extrusion disc 36, the elastic force is transmitted to the upper wire through the conical surface. The 5-10 N tension prevents the wire body from loosening or the wire core from breaking. The 60°-90° conical angle allows the contact area between the conical surface and the upper wire to change linearly with the displacement when the conical extrusion disc 36 moves, precisely controlling the tension while dispersing pressure to avoid local stress damage to the wire core; the inclined U-shaped plate 34 The tilt angle is 15°-30°, and its opening direction is consistent with the infeed direction of the upper wire. This allows the upper wire to pass through the gap formed by the extrusion plate 35 and the conical extrusion plate 36, achieving adaptive tension adjustment and reducing friction loss of the wire. The 15°-30° tilt angle matches the infeed direction of the upper wire, guiding the upper wire to smoothly enter the gap between the extrusion plate 35 and the conical extrusion plate 36, reducing friction caused by sharp bends. The opening direction is consistent with the infeed direction, allowing the upper wire to pass through the gap in a straight line, reducing energy loss during detours. When the tension of the upper wire fluctuates, the inclined surface of the inclined U-shaped plate 34, in conjunction with the elastic deformation of the spring 37, automatically adjusts the gap size to achieve adaptive tension adjustment. At the same time, the smooth surface reduces friction of the upper wire, preventing the wire from fraying or breaking.

[0039] Specifically, the 0-15 N / cm elastic coefficient allows the spring 37 to generate moderate elastic force. When the adjusting screw 32 pushes the conical extrusion disc 36, the elastic force is transmitted to the upper wire through the conical surface. The 5-10 N tension prevents the wire from slack or the wire core from breaking. The 60°-90° conical angle allows the contact area between the conical surface and the upper wire to change linearly with the displacement when the conical extrusion disc 36 moves, precisely controlling the tension and dispersing the pressure to avoid local stress damage to the wire core. At the same time, the 15°-30° tilt angle matches the upper wire's infeed direction, guiding the upper wire smoothly into the gap between the extrusion disc 35 and the conical extrusion disc 36, reducing the friction caused by sharp bends. The opening direction is consistent with the infeed direction, allowing the upper wire to pass through the gap in a straight line, reducing energy loss during detours. When the upper wire tension fluctuates, the tilted U-shaped plate 34, in conjunction with the elastic deformation of the spring 37, automatically adjusts the gap size to achieve adaptive tension adjustment. At the same time, the smooth surface reduces upper wire friction, preventing the wire from fraying or breaking.

[0040] Working principle: First, the upper thread is wound clockwise around the rotating wheel 22 once under the guidance of the limiting post 23. When the sewing equipment is running, the traction force on the upper thread will cause the rotating wheel 22 to rotate. Since the rotating wheel 22 and the rotating wheel meter 21 are fixed coaxially, the number of rotations of the rotating wheel 22 will be converted into a metering number through gear transmission and displayed in real time by the rotating wheel meter 21, so that the worker can check the length of the upper thread used. When the bobbin needs to be replaced, after changing the thread, press the reset button 24 to reset the counting gear of the rotating wheel meter 21 to zero, thereby resetting the metering number.

[0041] Furthermore, through the tension adjustment mechanism 3, the upper wire will pass through the opening of the inclined U-shaped plate 34 and enter the gap between the extrusion plate 35 and the conical extrusion plate 36. By rotating the adjusting screw 32, the conical extrusion plate 36 can be moved, causing the spring 37 to be compressed and generate elastic force, thereby applying tension to the upper wire. The fixing nut 33 can lock the position of the adjusting screw 32 to maintain the stability of the tension. The inclined U-shaped plate 34 can guide the upper wire and reduce friction loss. If the tension of the upper wire fluctuates, the spring 37 will automatically buffer it. The tension is adaptively adjusted by the slight displacement of the conical extrusion plate 36, thereby fixing the tension of the upper wire.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic thread changer for sewing equipment, comprising a T-shaped block (1), characterized in that: The outer wall of the T-shaped block (1) is provided with a magnetic suction metering display mechanism (2), which is used to display the number of meters used on the line in real time. The rear side of the T-shaped block (1) is provided with a tension adjustment mechanism (3), which is used to fix the tension of the line. The magnetic metering display mechanism (2) includes a rotary meter (21). The outer wall of the rotary meter (21) is fixedly connected to the left side of the outer wall of the T-shaped block (1). The right end of the rotary meter (21) passes through the right side of the T-shaped block (1) and is fixedly connected to a rotating wheel (22). Multiple limiting posts (23) are rotatably connected to the right side of the T-shaped block (1). A reset button (24) is fixedly connected to the front side of the outer wall of the rotary meter (21). A magnetic base (25) is fixedly connected to the bottom end of the T-shaped block (1).

2. The magnetic thread changer for sewing equipment according to claim 1, characterized in that: The tension adjustment mechanism (3) includes a fixing bar (31), the bottom end of which is fixedly connected to the rear side of the T-block (1). An adjusting screw (32) is provided on the right side of the fixing bar (31). The left side of the outer wall of the adjusting screw (32) passes through the left side of the fixing bar (31) and is threaded with a fixing nut (33). An inclined U-shaped plate (34) is provided on the right side of the fixing bar (31), and a pressing disc (35) is provided on the right side of the inclined U-shaped plate (34). The adjustment... The outer wall of the screw (32) passes through the inner wall of the extrusion disc (35) and the inclined U-shaped plate (34) in sequence. A spring (37) is fixedly connected to the left side of the adjusting screw (32). A conical extrusion disc (36) is fixedly connected to the left side of the spring (37). The fixing strip (31) of the tension adjustment mechanism (3) is fixed to the rear side of the T-shaped block (1) by welding or bolting. The inclined U-shaped plate (34) and the fixing strip (31) are detachably connected so as to replace extrusion discs (35) of different specifications.

3. The magnetic thread changer for sewing equipment according to claim 1, characterized in that: The magnetic base (25) is made of neodymium iron boron permanent magnet material, and the contact area between its adsorption surface and the metal surface of the sewing equipment is not less than 20 cm². 2 This is to ensure that the device remains stable and fixed when the equipment vibrates.

4. The magnetic thread changer for sewing equipment according to claim 1, characterized in that: The outer circumferential surface of the rotary meter (21) is provided with an anti-slip rubber layer. The ratio of the diameter of the rotating wheel (22) to the diameter of the upper line is 50:1 to 80:1 to ensure the synchronicity of the upper line driving the rotating wheel to rotate and improve the metering accuracy.

5. A magnetic thread changer for sewing equipment according to claim 1, characterized in that: The reset button (24) has a pressing stroke of 2-3mm and is equipped with an elastic reset structure inside. When pressed, it can drive the counting gear of the rotary meter (21) to zero, realizing one-key reset of the metering number.

6. A magnetic thread changer for sewing equipment according to claim 2, characterized in that: The elastic coefficient of the spring (37) is 10-15 N / cm, and the cone angle of the conical extrusion plate (36) is 60°-90°. When the conical extrusion plate (36) is moved by the adjusting screw (32), a tension of 5-10 N can be applied to the upper wire to ensure the stability of the wire body and to prevent damage to the wire core.

7. A magnetic thread changer for sewing equipment according to claim 1, characterized in that: The number of limiting posts (23) is 3, and they are arranged in an arc on the wire outlet side of the rotating wheel (22) to guide the upper wire to wind around the rotating wheel (22) in a clockwise direction, so as to avoid measurement errors caused by the chaotic winding of the wire and improve measurement accuracy.

8. A magnetic thread changer for sewing equipment according to claim 2, characterized in that: The inclined U-shaped plate (34) has an inclination angle of 15°-30° and its opening direction is consistent with the inlet direction of the upper wire, so that when the upper wire passes through, the tension can be adaptively adjusted through the gap formed by the extrusion plate (35) and the conical extrusion plate (36), while reducing the friction loss of the wire.

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