An automatic synchronous compensation device for a double-layer thread tension lever of a rotary hook electronic thread feeding and thread demand device

Abstract

The utility model discloses a kind of automatic synchronous compensation devices of electronic thread feeding need thread amount double-layer thread tensioning lever of rotary hook, be equipped on the head of sewing machine or embroidery machine, the automatic synchronous compensation device of electronic thread feeding need thread amount double-layer thread tensioning lever of rotary hook of this includes expansion component, expansion component includes fixed seat and the upper thread tensioning lever that can reciprocating swing, fixed seat is installed on the head, driving device is equipped on fixed seat, driving device is connected with upper thread tensioning lever by transmission mechanism. The utility model can when using large-capacity rotary hook optimization upgrade in sewing equipment, by adding thread tensioning lever adjusting thread amount on the basis of original equipment, compensate the need thread amount of large-capacity rotary hook, avoid the poor applicability, perle tight, unstable take-up, broken wire and other problems due to need thread amount exceeding equipment load, to greatly improve the functionality and practicality of sewing equipment.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and more specifically, it relates to an automatic synchronous compensation device for the double-layer thread take-up lever of the rotary hook electronic thread feeding. Background Technology

[0002] Currently, the thread feed rate of all sewing and embroidery equipment on the market is controlled by accessories such as cams and thread take-up levers based on the original shuttle size. The thread feed rate is fixed for each machine, and the adjustment components are often located near the core of the machine. Therefore, any subsequent optimization or upgrades are cumbersome, hindering flexible and efficient expansion and making the product unable to adapt to market changes, thus putting companies at a disadvantage in market competition. Utility model patent CN218466093U discloses a thread feed mechanism for a sewing machine and a sewing machine itself. Through the arrangement of the thread take-up lever drive shaft, needle bar drive shaft, and shuttle drive shaft, as well as the design of the drive structure, the sewing thread take-up mechanism becomes more compact, which is beneficial for miniaturized machine head design and is more suitable for double-needle sewing machines. However, this utility model also hinders product expansion and upgrades based on the original structure. Utility Model Content

[0003] Existing sewing equipment faces challenges such as high costs and long cycles for modification, while failure to modify it leads to fierce market competition, loss of core competitiveness, and eventual elimination from the market. To overcome these shortcomings, this utility model provides an automatic synchronous compensation device for the double-layer thread take-up lever with electronic thread feeding of rotary hooks, which can improve the product's lightweight level, assembly reliability, and assembly efficiency.

[0004] The technical solution of this utility model is: an automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder, installed on the head of a sewing machine or embroidery machine. This device includes an extension assembly, which comprises a fixed base and a reciprocating upper thread take-up lever. The fixed base is mounted on the machine head and has a drive device. The drive device is connected to the upper thread take-up lever via a transmission mechanism. When optimizing and upgrading sewing machines or embroidery machines, larger capacity rotary hooks are used. Larger capacity rotary hooks require more thread, and existing equipment cannot meet the normal operation requirements of these larger capacity rotary hooks without modifying the connecting rods and cams. This utility model, while retaining the original structure of the sewing machine or embroidery machine, adds an extension component to the top layer of the machine head, which works synchronously and collaboratively with the original thread take-up lever. Without changing the original thread take-up lever and related surrounding structures, an external thread take-up lever and matching components are added to meet the increased thread requirements of large-capacity rotary hooks, allowing large-capacity rotary hook products to be used normally, and achieving equipment upgrade and optimization at low cost.

[0005] Preferably, the extension assembly includes an extension wall panel, and the transmission mechanism includes a take-up lever fixing seat and a swing arm that drives the take-up lever fixing seat. The take-up lever fixing seat is rotatably connected to the extension wall panel, and the swing arm is connected to a drive shaft, which is then connected to a drive device. The extension wall panel provides a stable installation foundation for the entire new system, allowing for a compact and orderly layout of all components. The take-up lever fixing seat is rotatably connected to the extension wall panel, and the transmission mechanism is formed by the swing arm, drive shaft, and drive device. This structural design effectively transmits the power of the drive device to the take-up lever fixing seat, enabling the reciprocating swing of the upper take-up lever, ensuring the stability and reliability of the system operation, and meeting the precise requirements of high-capacity rotary hooks for take-up movements.

[0006] Preferably, the thread take-up lever fixing seat is equipped with a drive groove, and a roller is rotatably connected to the end of the swing arm, with the roller embedded in the drive groove. This connection method enables precise drive of the thread take-up lever fixing seat by the swing arm. The roller rolls within the drive groove, forming a hinged connection that adapts to changes in the position of the connection point between the swing arm and the thread take-up lever fixing seat as the seat rotates. This smoothly converts the swing of the swing arm into the rotation of the thread take-up lever fixing seat, reducing friction and energy loss during transmission, resulting in a smoother and more fluid thread take-up action. Simultaneously, this design allows for precise control of the rotation angle and speed of the thread take-up lever fixing seat, ensuring that the upper thread take-up lever accurately matches the thread requirements of a large-capacity rotary hook during sewing or embroidery, guaranteeing a stable and precise supply of thread and improving the quality of sewing or embroidery.

[0007] Preferably, the upper lifting rod and a fixed plate are integrally formed, and the fixed plate is installed on the lifting rod fixing seat with screws. The integral formation of the upper lifting rod and the fixed plate reduces the gap and loosening risk at the connection parts, allowing the upper lifting rod to withstand greater tension and vibration during frequent reciprocating swings, and making it less prone to deformation or damage.

[0008] Preferably, a thread guide bobbin is also included. The bobbin is rotatably connected to the extension panel, and the top thread, threaded through the end of the upper take-up lever, is tensioned on the bobbin. The bobbin alters the direction of the top thread and increases its travel. By adjusting the winding method and tension of the top thread on the bobbin, the tension can be precisely controlled. For high-capacity rotary hooks, the required thread quantity and thread speed vary considerably, making precise top thread tension control particularly important. Appropriate top thread tension prevents problems such as loose stitches and skipped stitches due to excessively loose thread, or fabric deformation and thread breakage due to excessively tight thread, ensuring smooth sewing or embroidery processes and improving product quality.

[0009] Preferably, the fixed base has two parallel, opposing upright plates, with the drive shaft rotatably connected to the two plates, and the swing arm located between the two plates. This structure provides stable support for the drive shaft and the swing arm, ensuring the stability of the drive shaft during rotation, reducing swaying and vibration, and thus ensuring the accuracy of the transmission. The space between the two upright plates provides a suitable range of motion for the swing arm, making the entire transmission mechanism layout more compact and rational, and effectively utilizing space.

[0010] Preferably, the drive device is an electric motor. Electric motors, as drive devices, have the advantages of stable speed and precise control.

[0011] Alternatively, the drive unit is a swing cylinder. Swing cylinders, as drive units, are characterized by their fast response speed.

[0012] The beneficial effects of this utility model are:

[0013] This invention improves the functionality and practicality of sewing equipment. When upgrading sewing equipment to use a large-capacity rotary hook, this invention adds a thread take-up lever to adjust the thread quantity, compensating for the thread requirements of the large-capacity hook. This avoids problems such as poor applicability, tight thread, unstable thread take-up, and thread breakage caused by the thread requirement exceeding the equipment's capacity, thus greatly improving the functionality and practicality of the sewing equipment.

[0014] It facilitates upgrades. The expansion component in this invention is installed on the outside of the machine head, which is easy to implement, improves the efficiency of upgrading and modifying sewing equipment, and reduces the cost of upgrading, modifying, and maintaining sewing equipment.

[0015] This invention improves product qualification rates and increases economic benefits. It facilitates the upgrading and transformation of sewing equipment, solving a series of problems caused by the increased thread requirements of large-capacity rotary hooks, thereby improving product qualification rates and economic efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0017] Figure 2 This is a schematic diagram of one structure of the transmission mechanism in this utility model.

[0018] Figure 3 This is a structural schematic diagram of the transmission mechanism in this utility model from another perspective.

[0019] Figure 4 This is a schematic diagram illustrating one application state of the present invention on a sewing machine.

[0020] In the diagram, 1-upper take-up lever, 2-line, 3-take-up lever fixing seat, 4-rotating shaft, 5-drive device, 6-fixed plate, 7-line guide shaft, 8-drive shaft, 9-swing arm, 10-roller, 11-fixed seat, 12-drive groove, 13-machine head, 14-extension wall panel, 15-lower take-up lever, 16-clamping arm. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1:

[0023] like Figures 1 to 4 As shown, an automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder is installed on the head 13 of a sewing machine or embroidery machine. The head 13 has a lower thread take-up lever 15, the structure and working mechanism of which are the same as in the prior art. This automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder includes a fixed base 11, an extension wall plate 14, a transmission mechanism, a drive device 5, and an upper thread take-up lever 1, which can reciprocate. The fixed base 11, extension wall plate 14, transmission mechanism, thread guide shaft 7, drive device 5, and upper thread take-up lever 1 constitute an extension assembly. This extension assembly is connected to the head 13 via the fixed base 11 and extension wall plate 14, which are fixed to the head 13 by bolts. The fixed base 11 includes a base plate and a pair of upright plates, which are welded to the base plate. The two upright plates are parallel and opposite each other, forming a U-shape with the base plate. The drive shaft 8 rotates and connects to the two upright plates, and the swing arm 9 is located between the two upright plates. The drive device 5 is mounted on the fixed base 11, and the drive device 5 is connected to the upper line-taking rod 1 through a transmission mechanism. The transmission mechanism includes the drive shaft 8, the line-taking rod fixing base 3, the rotating shaft 4, and the swing arm 9. A fixing plate 6 is installed on one side of the line-taking rod fixing base 3, and the fixing plate 6 is connected to the line-taking rod fixing base 3 by screws. The upper line-taking rod 1 and the fixing plate 6 are integrally formed.

[0024] The drive unit 5 is bolted to the outside of a vertical plate. A rotating shaft 4 passes through the center of the lifting rod fixing seat 3 and is keyed to it. Both ends of the rotating shaft 4 are rotatably connected to the extension wall plate 14, allowing the lifting rod fixing seat 3 to be rotatably connected to the extension wall plate 14. One end of the swing arm 9 is rotatably connected to a roller 10, and the other end has a pair of clamping arms 16 that can be locked with bolts. A drive shaft slot is provided between the two clamping arms 16, and the drive shaft 8 is embedded in the drive shaft slot, forming an interference fit. After the clamping arms 16 are locked, they clamp the drive shaft 8, forming a transmission connection between the swing arm 9 and the drive shaft 8. The swing arm 9, driven by the drive shaft 8, then drives the lifting rod fixing seat 3 to rotate reciprocally. The lifting rod fixing seat 3 has a drive groove 12, which is U-shaped. The roller 10 is fitted into the drive groove 12 and always maintains rolling contact with the inner wall of the drive groove 12. The drive shaft 8 is keyed to the drive unit 5. The drive device 5 is a motor. There are two guide shafts 7, one above the other, which are rotatably connected to the extension wall plate 14. The thread 2 first passes around the upper guide shaft 7 and then passes through the end of the upper take-up rod 1. After being led out, it is wrapped around the lower guide shaft 7 to be tensioned. It is then led down to the machine head 13, and after being reversed and folded back, it passes through the end of the lower take-up rod 15.

[0025] During operation of this automatic synchronous compensation device for the double-layer thread take-up lever of the rotary hook, when the upper thread take-up lever 1 moves to a near-horizontal position, it provides maximum compensation for the required thread volume. Simultaneously, the lower thread take-up lever 15 also reaches its fixed maximum position. The thread requirement of a large-capacity rotary hook = the thread volume of the lower thread take-up lever 15 + the compensated thread volume of the upper thread take-up lever 1, thus meeting the thread requirement of the large-capacity rotary hook. The advantage of this solution is that the thread volume of the upper thread take-up lever 1 can be controlled at any angle, allowing for targeted adjustments. Each head can be adjusted individually, compensating for inconsistencies in the installation precision of original equipment parts. The thread volume can also be adjusted individually through the upper thread take-up lever 1, greatly improving the effect and efficiency of the sewing equipment. When the required thread volume of the rotary hook reaches its maximum, the upper take-up lever 1 is raised to its highest point. When passing the highest point and entering the take-up stage, the take-up thread 2 is controlled by the back-and-forth swinging motion of the drive device 5. The upper take-up lever 1 moves in the opposite direction to avoid the take-up thread being too slow, which would lead to unstable thread throwing and take-up. The swinging of the upper take-up lever 1 compensates for the situation where the take-up thread is not fast enough. This improvement scheme should pay attention to ensuring that the signal of the newly added upper take-up lever 1 swinging component is synchronized with the signal used by the original lower take-up lever 15. The encoder signal source of the receiving device itself is used to control the up-and-down swinging motion of the newly added take-up thread plate swinging component, so that the equipment and the added component work together synchronously. Ultimately, this adjusts the instability caused by the increased thread volume of the large-capacity rotary hook and solves the instability of the large-capacity rotary hook caused by the increased thread volume during use.

[0026] Example 2:

[0027] An automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder is installed on the head 13 of a sewing machine or embroidery machine. The head 13 has a lower thread take-up lever 15, the structure and working mechanism of which are the same as in the prior art. This automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder includes a fixed base 11, an extension wall plate 14, a transmission mechanism, a drive device 5, and an upper thread take-up lever 1, which can reciprocate. The fixed base 11, extension wall plate 14, transmission mechanism, thread guide shaft 7, drive device 5, and upper thread take-up lever 1 constitute an extension assembly. This extension assembly is connected to the head 13 via the fixed base 11 and extension wall plate 14, which are fixed to the head 13 with bolts. The fixed base 11 includes a base plate and a pair of upright plates welded to the base plate. The two upright plates are parallel and opposite each other, forming a U-shape with the base plate. The drive shaft 8 rotates and connects to the two upright plates, and the swing arm 9 is located between the two upright plates. The drive device 5 is mounted on the fixed base 11, and the drive device 5 is connected to the upper line-taking rod 1 through a transmission mechanism. The transmission mechanism includes the drive shaft 8, the line-taking rod fixing base 3, the rotating shaft 4, and the swing arm 9. A fixing plate 6 is installed on one side of the line-taking rod fixing base 3, and the fixing plate 6 is connected to the line-taking rod fixing base 3 by screws. The upper line-taking rod 1 and the fixing plate 6 are integrally formed.

[0028] The drive unit 5 is bolted to the outside of a vertical plate. A rotating shaft 4 passes through the center of the lifting rod fixing seat 3 and is keyed to it. Both ends of the rotating shaft 4 are rotatably connected to the extension wall plate 14, allowing the lifting rod fixing seat 3 to be rotatably connected to the extension wall plate 14. One end of the swing arm 9 is rotatably connected to a roller 10, and the other end has a pair of clamping arms 16 that can be locked with bolts. A drive shaft slot is provided between the two clamping arms 16, and the drive shaft 8 is embedded in the drive shaft slot, forming an interference fit. After the clamping arms 16 are locked, they clamp the drive shaft 8, forming a transmission connection between the swing arm 9 and the drive shaft 8. The swing arm 9, driven by the drive shaft 8, then drives the lifting rod fixing seat 3 to rotate reciprocally. The lifting rod fixing seat 3 has a drive groove 12, which is U-shaped. The roller 10 is fitted into the drive groove 12 and always maintains rolling contact with the inner wall of the drive groove 12. The drive shaft 8 is keyed to the drive unit 5. Unlike Embodiment 1, in this embodiment, the drive device 5 is a swing cylinder. There are two guide shafts 7, one above the other, rotatably connected to the extension wall plate 14. The thread 2 first passes around the upper guide shaft 7 and then through the end of the upper take-up rod 1, leading out and then wrapping around the lower guide shaft 7 to tighten it. It is then led downwards to the machine head 13, reversed direction, and then through the end of the lower take-up rod 15. The rest is the same as in Embodiment 1.

[0029] During operation of this automatic synchronous compensation device for the double-layer thread take-up lever of the rotary hook, when the upper thread take-up lever 1 moves to a near-horizontal position, it provides maximum compensation for the required thread volume. Simultaneously, the lower thread take-up lever 15 also reaches its fixed maximum position. The thread requirement of a large-capacity rotary hook = the thread volume of the lower thread take-up lever 15 + the compensated thread volume of the upper thread take-up lever 1, thus meeting the thread requirement of the large-capacity rotary hook. The advantage of this solution is that the thread volume of the upper thread take-up lever 1 can be controlled at any angle, allowing for targeted adjustments. Each head can be adjusted individually, compensating for inconsistencies in the installation precision of original equipment parts. The thread volume can also be adjusted individually through the upper thread take-up lever 1, greatly improving the effect and efficiency of the sewing equipment. When the required thread volume of the rotary hook reaches its maximum, the upper take-up lever 1 is raised to its highest point. When passing the highest point and entering the take-up stage, the take-up thread 2 is controlled by the back-and-forth swinging motion of the drive device 5. The upper take-up lever 1 moves in the opposite direction to avoid the take-up thread being too slow, which would lead to unstable thread throwing and take-up. The swinging of the upper take-up lever 1 compensates for the situation where the take-up thread is not fast enough. This improvement scheme should pay attention to ensuring that the signal of the newly added upper take-up lever 1 swinging component is synchronized with the signal used by the original lower take-up lever 15. The encoder signal source of the receiving device itself is used to control the up-and-down swinging motion of the newly added take-up thread plate swinging component, so that the equipment and the added component work together synchronously. Ultimately, this adjusts the instability caused by the increased thread volume of the large-capacity rotary hook and solves the instability of the large-capacity rotary hook caused by the increased thread volume during use.

[0030] Example 3:

[0031] An automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder is installed on the head 13 of a sewing machine or embroidery machine. The head 13 has a lower thread take-up lever 15, the structure and working mechanism of which are the same as in the prior art. This automatic synchronous compensation device for the double-layer thread take-up lever of a rotary hook electronic thread feeder includes a fixed base 11, an extension wall plate 14, a transmission mechanism, a drive device 5, and an upper thread take-up lever 1, which can reciprocate. The fixed base 11, extension wall plate 14, transmission mechanism, thread guide shaft 7, drive device 5, and upper thread take-up lever 1 constitute an extension assembly. This extension assembly is connected to the head 13 via the fixed base 11 and extension wall plate 14, which are fixed to the head 13 with bolts. The fixed base 11 includes a base plate and a pair of upright plates welded to the base plate. The two upright plates are parallel and opposite each other, forming a U-shape with the base plate. The drive shaft 8 rotates and connects to the two upright plates, and the swing arm 9 is located between the two upright plates. The drive device 5 is mounted on the fixed base 11, and the drive device 5 is connected to the upper line-taking rod 1 through a transmission mechanism. The transmission mechanism includes the drive shaft 8, the line-taking rod fixing base 3, the rotating shaft 4, and the swing arm 9. A fixing plate 6 is installed on one side of the line-taking rod fixing base 3, and the fixing plate 6 is connected to the line-taking rod fixing base 3 by screws. The upper line-taking rod 1 and the fixing plate 6 are integrally formed.

[0032] The drive unit 5 is bolted to the outside of a vertical plate. A rotating shaft 4 passes through the center of the lifting rod fixing seat 3 and is keyed to it. Both ends of the rotating shaft 4 are rotatably connected to the extension wall plate 14, allowing the lifting rod fixing seat 3 to be rotatably connected to the extension wall plate 14. One end of the swing arm 9 is rotatably connected to a roller 10, and the other end has a pair of clamping arms 16 that can be locked with bolts. A drive shaft slot is provided between the two clamping arms 16, and the drive shaft 8 is embedded in the drive shaft slot, forming an interference fit. After the clamping arms 16 are locked, they clamp the drive shaft 8, forming a transmission connection between the swing arm 9 and the drive shaft 8. The swing arm 9, driven by the drive shaft 8, then drives the lifting rod fixing seat 3 to rotate reciprocally. The lifting rod fixing seat 3 has a drive groove 12, which is U-shaped. The roller 10 is fitted into the drive groove 12 and always maintains rolling contact with the inner wall of the drive groove 12. The drive shaft 8 is keyed to the drive unit 5. The drive device 5 is a motor. There are two guide spools 7, one above the other, rotatably connected to the extension wall plate 14. The thread 2 first passes over the upper guide spool 7 and then through the end of the upper take-up rod 1, leading out and then wrapping around the lower guide spool 7 to tighten it. It is then led downwards to the machine head 13, reversed direction, and then through the end of the lower take-up rod 15. Unlike Embodiment 1, in this embodiment, one drive device 5 controls the auxiliary thread replenishment amount of multiple machine heads 13. Everything else is the same as in Embodiment 1.

[0033] During operation of the automatic synchronization compensation device for the thread take-up lever, when the upper thread take-up lever 1 moves to a near-horizontal position, it provides maximum thread requirement compensation at this position. Simultaneously, the lower thread take-up lever 15 also reaches its fixed maximum position. The thread requirement of the large-capacity rotary hook = the thread requirement of the lower thread take-up lever 15 + the compensated thread requirement of the upper thread take-up lever 1, thus meeting the thread requirement of the large-capacity rotary hook. The advantage of this solution is that the thread requirement of the upper thread take-up lever 1 can be controlled at any angle, allowing for targeted adjustments. Each head can be adjusted individually, compensating for inconsistencies in the installation precision of original equipment parts. The thread requirement can also be adjusted individually through the upper thread take-up lever 1, greatly improving the effect and efficiency of the sewing equipment. When the required thread volume of the rotary hook reaches its maximum, the upper take-up lever 1 is raised to its highest point. When passing the highest point and entering the take-up stage, the take-up thread 2 is controlled by the back-and-forth swinging motion of the drive device 5. The upper take-up lever 1 moves in the opposite direction to avoid the take-up thread being too slow, which would lead to unstable thread throwing and take-up. The swinging of the upper take-up lever 1 compensates for the situation where the take-up thread is not fast enough. This improvement scheme should pay attention to ensuring that the signal of the newly added upper take-up lever 1 swinging component is synchronized with the signal used by the original lower take-up lever 15. The encoder signal source of the receiving device itself is used to control the up-and-down swinging motion of the newly added take-up thread plate swinging component, so that the equipment and the added component work together synchronously. Ultimately, this adjusts the instability caused by the increased thread volume of the large-capacity rotary hook and solves the instability of the large-capacity rotary hook caused by the increased thread volume during use.

Claims

1. An automatic synchronous compensation device for the double-layer take-up lever of the rotary hook electronic thread feed, installed on the head (13) of a sewing machine or embroidery machine, characterized in that, The device includes an extension assembly, which includes a fixed base (11) and a reciprocating upper take-up lever (1). The fixed base (11) is mounted on the machine head (13), and a drive device (5) is provided on the fixed base (11). The drive device (5) is connected to the upper take-up lever (1) through a transmission mechanism.

2. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to claim 1, characterized in that, The extension assembly includes an extension wall panel (14), and the transmission mechanism includes a take-up rod fixing seat (3) and a swing arm rod (9) that drives the take-up rod fixing seat (3). The take-up rod fixing seat (3) is rotatably connected to the extension wall panel (14), and the swing arm rod (9) is connected to a drive shaft (8). The drive shaft (8) is connected to the drive device (5) in a transmission connection.

3. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to claim 2, characterized in that, The take-up rod fixing seat (3) is provided with a drive groove (12), and the end of the swing arm rod (9) is rotatably connected to a roller (10), which is fitted into the drive groove (12).

4. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to claim 2, characterized in that, The upper take-up rod (1) is integrally formed with a fixed plate, which is installed on the take-up rod fixing seat (3) by screws.

5. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to claim 2, characterized in that, It also includes a thread guide (7), which is rotatably connected to the extension wall panel (14), and the face line (2) that is connected to the end of the upper thread take-up rod (1) is attached to the thread guide (7).

6. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to claim 2, characterized in that, The fixed base (11) has two parallel and opposite upright plates, the drive shaft (8) rotates through the two upright plates, and the swing arm (9) is located between the two upright plates.

7. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to any one of claims 1 to 6, characterized in that, The driving device (5) is a motor.

8. The automatic synchronous compensation device for the double-layer wire take-up lever of the rotary hook electronic wire feeding according to any one of claims 1 to 6, characterized in that, The drive unit (5) is a swing cylinder.

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