A closed loop controlled thread tensioner and sewing machine

Abstract

This utility model discloses a closed-loop controlled thread clamp and sewing machine, relating to the field of sewing machine technology. To solve the problem of electronic thread clamps being unable to accurately control thread tension under open-loop control, the device includes a housing. An electromagnet drives a pressure detection device and a loosening rod to move axially along the housing. The pressure detection device detects the clamping force of the thread clamp in real time. The thread clamp includes a clamping rod shaft, a loosening pin sliding along the inner wall of the clamping rod shaft, and an outer clamping plate and an inner clamping plate sliding along the outer wall of the clamping rod shaft. A thread clamp cap is provided at the end of the clamping rod shaft away from the loosening rod. The two ends of the loosening pin abut against the loosening rod and the inner clamping plate, respectively. A compression spring is provided between the outer and inner clamping plates to provide a preload force that moves the inner clamping plate away from the outer clamping plate. A control device is signal-connected to the electromagnet and the pressure detection device, and the control device controls the operation of the electromagnet based on the clamping force detected by the pressure detection device.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and more specifically, to a closed-loop controlled thread clamp and sewing machine. Background Technology

[0002] In the sewing process of a sewing machine, the thread tensioner plays a crucial role. Its core function is to ensure smooth thread pulling when the sewing machine re-stitches, thus preventing loose threads from remaining on the fabric. These loose threads not only affect the appearance of the fabric but can also lead to a decline in sewing quality. Therefore, the evenness of the thread tensioner's tension is a key technical factor in ensuring its successful operation. Different fabric thicknesses require different thread tension settings, necessitating precise adjustments to the thread tensioner based on the specific situation.

[0003] In the early days of sewing machine development, the tension of the thread tensioner was primarily adjusted manually. While simple, this method had significant limitations. Manual adjustment required operators to rely on experience and intuition to judge whether the tension was appropriate, which was not only inefficient but also difficult to guarantee accuracy and consistency. With the continuous development of intelligent sewing machines, electronic thread tensioners emerged and have gradually gained widespread application. The advent of electronic thread tensioners has brought new opportunities for the automation and intelligent development of sewing machines, while also placing higher demands on the control precision of these devices.

[0004] Currently, most electronic thread clamps use an open-loop control method. This control method has many problems in practical applications. Due to differences in component performance, errors in the production and installation process, and errors in signal transmission, the open-loop control system cannot obtain accurate information in real time about whether the thread is clamped and whether the clamping force meets the thread tension requirements. This results in the system being unable to precisely adjust the tension of the thread clamp, making it difficult to achieve the desired sewing effect.

[0005] Therefore, how to solve the problem that electronic wire clamps cannot accurately control the tightness of the wire clamp under open-loop control is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a closed-loop controlled wire clamp that can precisely control the movement of the electromagnet and the clamping force of the wire clamp.

[0007] Another objective of this invention is to provide a sewing machine that includes the above-mentioned closed-loop control of the thread clamp, which improves sewing performance and product quality, and also reduces operating difficulty and maintenance costs.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A closed-loop controlled wire clamp includes: a housing and a wire clamp, a wire release rod, a pressure detection device and an electromagnet arranged sequentially along the axial direction of the housing;

[0010] Electromagnets are used to drive the pressure detection device and the slack rod to move axially along the housing. The pressure detection device is used to detect the clamping force of the wire clamp in real time.

[0011] The wire clamp includes a wire clamping rod shaft, a wire loosening pin that slides along the inner wall of the wire clamping rod shaft, and an outer wire clamping plate and an inner wire clamping plate that slide along the outer wall of the wire clamping rod shaft. The end of the wire clamping rod shaft away from the wire loosening rod is provided with a wire clamping cap. The two ends of the wire loosening pin abut against the wire loosening rod and the inner wire clamping plate, respectively. A compression spring is provided between the outer wire clamping plate and the inner wire clamping plate. The compression spring is used to provide a preload force to move the inner wire clamping plate away from the outer wire clamping plate.

[0012] The control device is connected to the electromagnet and the pressure detection device. The control device is used to control the operation of the electromagnet according to the clamping force detected by the pressure detection device.

[0013] Preferably, the pressure detection device includes a housing and a pressure sensor disposed within the housing, the housing having an opening for a power supply magnet to contact the pressure sensor.

[0014] Preferably, the electromagnet is located at one end of the housing, and the electromagnet includes an electromagnet shaft, an iron core, and a main body arranged coaxially from the inside to the outside, with the electromagnet shaft and iron core movably disposed on the main body.

[0015] Preferably, the electromagnet shaft extends from both ends of the main body, and an elastic element is provided at the end of the electromagnet shaft away from the pressure detection device. The elastic element is used to provide a preload force to move the electromagnet shaft away from the pressure detection device.

[0016] Preferably, the elastic element is a tower spring, which is sleeved on the electromagnet shaft. The two ends of the elastic element are respectively limited by a limiting nut and the main body, and a washer is provided between the main body and the elastic element.

[0017] Preferably, a baffle extending circumferentially is provided at one end of the electromagnet shaft near the pressure detection device, and a buffer washer is fitted on the electromagnet shaft, with the buffer washer located between the baffle and the main body.

[0018] Preferably, the wire clamp also includes a wire clamping seat disposed within the housing, the wire clamping rod shaft is fixed to the wire clamping seat, the wire clamp cap is connected to the wire clamping rod shaft through a head shaft, and a limiting groove for installing a compression spring is provided at one end of the head shaft near the inner wire clamping piece, the limiting groove extending axially along the head shaft.

[0019] Preferably, the clamping rod shaft is also provided with a pressure plate. The end face of the pressure plate near the clamp cap is a conical surface. The outer edge of the end face of the pressure plate near the outer clamping piece is provided with an annular pressing part, which corresponds to the clamping part of the outer clamping piece.

[0020] Preferably, a stop pad is provided between the wire clamp cap and the pressure plate, and the stop pad is slidably arranged along the wire clamp rod axis.

[0021] A sewing machine comprising a closed-loop controlled thread clamp as described in any of the preceding claims.

[0022] The closed-loop controlled wire clamp provided by this utility model includes a housing and a wire clamp, a wire release rod, a pressure detection device, and an electromagnet arranged sequentially along the axial direction of the housing. This makes the entire device compact. The electromagnet is used to drive the pressure detection device and the wire release rod to move along the axial direction of the housing. As a driving element, the electromagnet can accurately control the movement of the wire release rod and the pressure detection device, ensuring that the clamping and releasing actions of the wire clamp are accurate. The pressure detection device is used to detect the clamping force of the wire clamp in real time, providing accurate data support for subsequent control and ensuring that the clamping force of the wire clamp is always in an ideal state.

[0023] The wire clamp includes a wire clamping rod shaft, a wire release pin that slides along the inner wall of the wire clamping rod shaft, and an outer wire clamping plate and an inner wire clamping plate that slide axially along the wire clamping rod shaft. The two ends of the wire release pin abut against the wire release rod and the inner wire clamping plate, respectively. The wire release pin slides along the inner wall of the wire clamping rod shaft, allowing for flexible adjustment of the position of the inner wire clamping plate, thereby achieving the clamping and loosening actions of the wire clamp. A wire clamp cap is provided at the end of the wire clamping rod shaft away from the wire release rod to limit the sliding stroke of the outer and inner wire clamping plates on the wire clamping rod shaft. A space is provided between the outer and inner wire clamping plates. It has a compression spring, which provides preload to keep the inner clamping piece away from the outer clamping piece, ensuring that the inner clamping piece can reliably separate from the outer clamping piece and realize the loosening action of the clamp. The control device is connected to the electromagnet and the pressure detection device. The control device controls the action of the electromagnet according to the clamping force detected by the pressure detection device. The control device dynamically adjusts the current of the electromagnet according to the clamping force data fed back by the pressure detection device in real time, realizing closed-loop control, thereby achieving intelligent adjustment and improving sewing quality and efficiency.

[0024] When the electromagnet is energized, it drives the pressure detection device and the loosening rod to move closer to the wire clamp. The loosening rod causes the loosening pin to slide along the inner wall of the clamping rod shaft, thereby causing the inner clamping plate and the outer clamping plate to fit tightly together, clamping the wire. The compression spring is compressed. At the same time, the pressure detection device detects the pressure in real time and transmits the data to the control device. The control device analyzes the data and adjusts the current through the electromagnet in real time to adjust the clamping force of the wire clamp. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 A schematic diagram of the closed-loop controlled wire clamp provided by this utility model;

[0027] Figure 2 This is a partial structural diagram of the closed-loop controlled wire clamp provided by this utility model;

[0028] Figure 3 This is a cross-sectional view of the closed-loop controlled wire clamp provided by this utility model;

[0029] Figure 4 A partial enlarged cross-sectional view of the closed-loop controlled wire clamp provided by this utility model;

[0030] Figure 5 This is a schematic diagram of the wire clamp cap provided by this utility model;

[0031] Figure 6 This is a schematic diagram of the head shaft provided by this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the clamping rod shaft provided by this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the inner clamping piece provided by this utility model.

[0034] Figure label:

[0035] 1-Shell;

[0036] 2-Wire clamp, 21-Wire clamping rod shaft, 22-Wire loosening pin, 23-Outer wire clamping plate, 24-Inner wire clamping plate, 25-Wire clamp cap, 26-Wire clamping base, 27-Head shaft, 28-Pressure plate, 29-Stop pad;

[0037] 3-Loosen the pole;

[0038] 4-Pressure detection device, 41-Housing, 42-Pressure sensor;

[0039] 5-Electromagnet, 51-Electromagnet shaft, 52-Iron core, 53-Main body;

[0040] 6-Compression spring;

[0041] 7-Elastic element;

[0042] 8-Limit nut;

[0043] 9-Gasket;

[0044] 10 - Buffer washer;

[0045] 11-Copper sleeve;

[0046] 12-Thread picking spring. Detailed Implementation

[0047] 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.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] The core of this invention is to provide a closed-loop controlled thread clamp that can precisely control the movement of the electromagnet 5 and the clamping force of the thread clamp 2. Another core aspect of this invention is to provide a sewing machine that includes the aforementioned closed-loop controlled thread clamp, which improves sewing performance and product quality while reducing operational difficulty and maintenance costs.

[0050] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 A closed-loop controlled wire clamp includes a housing 1 and a wire clamp 2, a wire release rod 3, a pressure detection device 4, and an electromagnet 5 arranged sequentially along the axial direction of the housing 1, making the entire device compact. The electromagnet 5 is used to drive the pressure detection device 4 and the wire release rod 3 to move along the axial direction of the housing 1. As a driving element, the electromagnet 5 can accurately control the movement of the wire release rod 3 and the pressure detection device 4, ensuring that the clamping and releasing actions of the wire clamp 2 are accurate. The pressure detection device 4 is used to detect the clamping force of the wire clamp 2 in real time, providing accurate data support for subsequent control and ensuring that the clamping force of the wire clamp 2 is always in an ideal state.

[0051] The wire clamp 2 includes a wire clamping rod shaft 21, a wire loosening pin 22 that slides along the inner wall of the wire clamping rod shaft 21, and an outer wire clamping piece 23 and an inner wire clamping piece 24 that slide axially along the wire clamping rod shaft 21. The two ends of the wire loosening pin 22 abut against the wire loosening rod 3 and the inner wire clamping piece 24, respectively. The wire loosening pin 22 slides along the inner wall of the wire clamping rod shaft 21, allowing for flexible adjustment of the position of the inner wire clamping piece 24, thereby realizing the clamping and loosening actions of the wire clamp 2. A wire clamp cap 25 is provided at the end of the wire clamping rod shaft 21 away from the wire loosening rod 3 to limit the sliding stroke of the outer wire clamping piece 23 and the inner wire clamping piece 24 on the wire clamping rod shaft 21. A compression spring 6 is provided between the inner clamping piece 24 and the outer clamping piece 23. The compression spring 6 is used to provide a pre-tightening force to move the inner clamping piece 24 away from the outer clamping piece 23, ensuring that the inner clamping piece 24 can reliably separate from the outer clamping piece 23, thereby realizing the loosening action of the clamping device 2. The control device is connected to the electromagnet 5 and the pressure detection device 4. The control device is used to control the action of the electromagnet 5 according to the clamping force detected by the pressure detection device 4. The control device dynamically adjusts the current of the electromagnet 5 according to the clamping force data fed back by the pressure detection device 4 in real time, thereby realizing closed-loop control, thus realizing intelligent adjustment and improving sewing quality and efficiency.

[0052] When electromagnet 5 is energized, it drives pressure detection device 4 and wire release rod 3 to move closer to wire clamp 2. Wire release rod 3 drives wire release pin 22 to slide along the inner wall of wire clamp rod shaft 21, thereby causing inner wire clamping piece 24 to fit tightly with outer wire clamping piece 23, clamping the wire. Compression spring 6 is compressed. At the same time, pressure detection device 4 detects pressure in real time and transmits the data to control device. Control device analyzes the data and adjusts the current through electromagnet 5 in real time to adjust the clamping force of wire clamp 2.

[0053] Please refer to the following: Figure 5 The wire clamp cap 25 is configured as a cylindrical structure, and the middle part of the wire clamp cap 25 is provided with a through hole for the wire clamp rod shaft 21 to pass through. In order to realize the detachable connection between the wire clamp cap 25 and the wire clamp rod shaft 21, and to give the wire clamp cap 25 a certain elastic space and installation allowance, an opening extending along the axial direction is provided in the circumference of the wire clamp cap 25, and the opening is connected to the through hole in the middle of the wire clamp cap 25. The side of the wire clamp cap 25 with the opening is connected by bolts to fix the wire clamp cap 25 and the wire clamp rod shaft 21.

[0054] The closed-loop control suture clamp described above uses a pressure detection device 4 to detect the clamping force of the suture clamp 2 in real time and feeds the detected clamping force data back to the control device. The control device adjusts the action of the electromagnet 5 in real time based on the comparison between the actual clamping force and the preset clamping force, thereby achieving precise control of the clamping force of the suture clamp 2. This closed-loop control method effectively avoids the problem of low clamping accuracy caused by factors such as component performance errors, production and installation errors, and transmission errors in traditional open-loop control. It can precisely adjust the tightness of the suture clamp 2 according to different fabric thicknesses and sewing requirements, ensuring the stability and consistency of thread tension during sewing.

[0055] In the above embodiment, the pressure detection device 4 includes a housing 41 and a pressure sensor 42 disposed within the housing 41. The housing 41 has an opening for the power supply magnet 5 to contact the pressure sensor 42. The pressure sensor 42 and the housing 41 move up and down synchronously along the inner wall of the housing 1.

[0056] It should be noted that by providing an opening in the housing 41, the electromagnet 5 can precisely push the pressure sensor 42, thereby achieving accurate detection of the clamping force of the thread clamp 2. This direct contact method reduces mechanical transmission links, thereby improving the response speed to changes in clamping force. This allows the control device to adjust the action of the electromagnet 5 more quickly to adapt to different sewing needs, improving the accuracy of pressure detection. Integrating the pressure sensor 42 inside the housing 41 and designing an opening to allow the power magnet 5 to contact the sensor makes the entire pressure detection device 4 compact in structure, occupying little space, and easy to integrate into the closed-loop control device of the electronic thread clamp 2. By precisely controlling the clamping force of the thread clamp 2, it helps to improve the uniformity and consistency of the stitches during the sewing process, thereby improving the quality of the final sewn product.

[0057] In the above case, the electromagnet 5 is located at one end of the housing 1. The electromagnet 5 includes an electromagnet shaft 51, an iron core 52 and a main body 53 arranged coaxially from the inside to the outside. The electromagnet shaft 51 and the iron core 52 are movably disposed on the main body 53.

[0058] Understandably, the main body 53 is fixed inside the housing 1, and a coil is located inside the main body 53. When the coil is energized, it drives the iron core 52 to move, and the iron core 52 is connected to the electromagnet shaft 51, which moves synchronously. The coaxial arrangement of the electromagnet shaft 51, the iron core 52, and the main body 53 ensures the stability and concentricity of the electromagnet 5 during operation, reducing wear and energy loss caused by eccentricity or tilting, thereby improving the service life and working efficiency of the electromagnet 5. The compact design of the electromagnet 5 reduces its space occupation, making the entire device more compact and easier to integrate into smaller devices, suitable for space-constrained applications. The precise design of the electromagnet 5 helps improve the control accuracy of the entire closed-loop control. By precisely controlling the movement of the electromagnet 5, precise control of the clamping force of the thread clamp 2 can be achieved, thereby improving sewing quality.

[0059] The copper sleeve 11 is fixed inside the main body 53. As a wear-resistant material, the copper sleeve 11 acts as a sliding bearing for the electromagnet shaft 51, reducing direct contact between the electromagnet shaft 51 and the main body 53 during operation, thereby reducing wear and extending the service life of the electromagnet 5. Copper has good electrical conductivity, and the copper sleeve 11 helps improve the conduction efficiency of the current inside the electromagnet 5, thus improving the working efficiency and response speed of the electromagnet 5. Copper not only has good electrical conductivity but also good heat dissipation properties. The copper sleeve 11 helps to quickly dissipate the heat generated by the electromagnet 5 during operation, preventing overheating and improving operational stability and reliability.

[0060] Furthermore, the electromagnet shaft 51 extends from both ends of the main body 53. An elastic element 7 is provided at the end of the electromagnet shaft 51 away from the pressure detection device 4. The elastic element 7 is used to provide a preload force to move the electromagnet shaft 51 away from the pressure detection device 4.

[0061] It should be noted that when the electromagnet 5 is energized, the coil inside the main body 53 of the electromagnet 5 is energized to generate a magnetic field, which drives the iron core 52 to move the electromagnet shaft 51 in the direction close to the pressure sensor 42, thereby compressing the elastic element 7. When the electromagnet 5 is de-energized, the restoring force of the elastic element 7 is used to drive the electromagnet shaft 51 to move the iron core 52 back to the initial position.

[0062] In the above embodiment, the elastic element 7 is a tower spring. The elastic element 7 is sleeved on the electromagnet shaft 51. The two ends of the elastic element 7 are respectively limited by the limiting nut 8 and the main body 53. A gasket 9 is provided between the main body 53 and the elastic element 7.

[0063] Understandably, the tower spring, as an elastic element 7, provides stable elastic force, ensuring that the electromagnet shaft 51 accurately returns to its initial position when power is off or when reset is required, thereby improving the accuracy of the entire closed-loop control. The tower spring is limited by the limit nut 8 and the main body 53, ensuring that it does not shift or deform during operation, enhancing the stability and reliability of the structure. The shim 9 acts as a buffer between the main body 53 and the tower spring, reducing direct contact and friction, thus reducing wear and extending the service life of the electromagnet shaft 51 and the tower spring. The design of the limit nut 8 allows for easy adjustment of the tower spring's preload to adapt to different operating requirements. This design also facilitates the maintenance and replacement of the tower spring.

[0064] Based on the above embodiment, a baffle extending circumferentially is provided at one end of the electromagnet shaft 51 near the pressure detection device 4, and a buffer washer 10 is sleeved on the electromagnet shaft 51, with the buffer washer 10 located between the baffle and the main body 53.

[0065] It should be noted that the buffer washer 10 forms a flexible buffer layer between the baffle and the main body 53, which can absorb the axial impact force generated by the high-frequency reciprocating motion of the electromagnet shaft 51, avoid direct rigid collision between the baffle and the main body 53, and significantly reduce mechanical noise and vibration. By reducing direct friction and impact between metal parts, the buffer washer 10 can prevent wear or deformation of the contact surface between the baffle and the main body 53, thereby improving the durability of key components such as the electromagnet shaft 51, the baffle, and the main body 53, and extending the service life of the overall device.

[0066] In the above embodiment, the wire clamp 2 further includes a wire clamping seat 26 disposed within the housing 1. The wire clamping rod shaft 21 is fixed to the wire clamping seat 26, and the wire clamping seat 26 fixes the wire clamping rod shaft 21 with an internal hexagon screw. The wire clamp cap 25 is connected to the wire clamping rod shaft 21 via a head shaft 27. The end of the head shaft 27 near the inner wire clamping plate 24 is provided with a limiting groove for installing the compression spring 6, and the limiting groove extends axially along the head shaft 27. The wire clamping seat 26 is provided with a groove for installing the wire take-up spring 12 to fix the position of the wire take-up spring 12.

[0067] Understandably, the thread clamp seat 26, fixed inside the housing 1, provides a stable support point for the thread clamp rod shaft 21, enhancing the structural stability of the entire thread clamp 2 and ensuring precise thread clamping action even during high-frequency use. The design of the head shaft 27 makes the connection between the thread clamp cap 25 and the thread clamp rod shaft 21 more precise, helping to improve the control accuracy of the thread clamp 2 on the thread, thereby improving sewing quality. The limiting groove on the head shaft 27 provides a clear installation position for the compression spring 6, making the installation and maintenance of the compression spring 6 more convenient, while also ensuring the stability of the compression spring 6 during operation. The design of the limiting groove helps reduce the wear of the compression spring 6 during operation. By extending axially along the head shaft 27, the compression and release of the compression spring 6 can be better guided, thereby extending the service life of the compression spring 6. This design allows the thread clamp 2 to adapt to threads of different thicknesses and materials, and by adjusting the compression degree of the compression spring 6, it can adapt to different sewing needs. Precise thread clamping control and structural stability help improve the production efficiency of sewing machines and reduce downtime caused by thread clamp 2 malfunctions.

[0068] The design of the head shaft 27 and the limiting groove makes the assembly and disassembly of the wire clamp 2 more convenient, which helps to improve the maintenance efficiency of the equipment.

[0069] Please refer to Figure 6 , Figure 7 and Figure 8 In this embodiment, the clamping rod shaft 21 is configured as a stepped cylindrical structure. A shoulder is provided in the middle of the clamping rod shaft 21 for mounting the thread-taking spring 12. The clamping rod shaft 21 is connected to the head shaft 27 via a plug-in structure. The clamping rod shaft 21 has a socket for the head shaft 27 to be inserted into. The clamping rod shaft 21 also has an elongated hole extending along the axial direction, communicating with the socket. The elongated hole is used for the sliding of the loosening pin 22. The loosening pin 22 can extend into the socket under the push of the loosening rod 3. The head shaft 27 is close to the clamping rod. One end of the rod shaft 21 is provided with a limiting groove for installing the compression spring 6. The middle of the inner clamping plate 24 and the outer clamping plate 23 are both round holes so that the clamping rod shaft 21 can pass through them. However, a connecting plate is also provided in the round hole of the inner clamping plate 24 for the loosening pin 22 to abut against. In this way, the compression spring 6 is restricted between the inner clamping plate 24, the clamping rod shaft 21 and the head shaft 27. Through the combined action of the inner clamping plate 24, the clamping rod shaft 21 and the head shaft 27, the compression spring 6 is effectively limited in the axial and circumferential directions.

[0070] When the slack rod 3 pushes the slack pin 22 to slide along the elongated hole toward the direction of the clamping rod shaft 21, it can push the inner clamping piece 24 to slide along the clamping rod shaft 21, causing the clamping rod shaft 21 to move toward the direction of the outer clamping piece 23, so that the outer clamping piece 23 and the inner clamping piece 24 can clamp the surface thread. At the same time, the compression spring 6 is compressed. When the slack rod 3 removes the external force applied to the slack pin 22, the inner clamping piece 24 and the slack pin 22 are pushed back to the initial position by the restoring force of the compression spring 6, so as to realize the release of the outer clamping piece 23 and the inner clamping piece 24, thereby releasing the surface thread from the outer clamping piece 23 and the inner clamping piece 24.

[0071] In a preferred embodiment, the clamping rod shaft 21 is also provided with a pressure plate 28. The end face of the pressure plate 28 near the clamp cap 25 is a conical surface. The outer edge of the end face of the pressure plate 28 near the outer clamping piece 23 is provided with an annular pressing part, which corresponds to the clamping part of the outer clamping piece 23.

[0072] It should be noted that the tapered surface design helps the pressure plate 28 apply force more smoothly during clamping, resulting in a more even distribution of clamping force on the pressing part, thereby improving the clamping stability of the thread clamp 2. The annular pressing part precisely corresponds to the clamping part of the outer clamping plate 23, ensuring that the thread can be accurately clamped during the clamping process, preventing the thread from slipping or shifting, and improving sewing accuracy. The design of the pressure plate 28 increases the structural strength of the thread clamp 2, and the tapered surface and pressing part design help to distribute the force, reduce wear on a single part, and thus extend the service life of the thread clamp 2.

[0073] In the above case, a stop pad 29 is provided between the wire clamp cap 25 and the pressure plate 28, and the stop pad 29 is slidably arranged along the wire clamp rod shaft 21.

[0074] Understandably, the stop pad 29 restricts the movement of the pressure plate 28, preventing it from moving excessively on the thread clamping rod shaft 21, thereby ensuring proper contact and stable clamping force between the pressure plate 28 and the outer thread clamping plate 23. The presence of the stop pad 29 increases the structural stability of the thread clamp 2, helping to maintain even and consistent stitches during sewing and improving sewing quality. The stop pad 29 slides along the thread clamping rod shaft 21, allowing the position of the pressure plate 28 to be adjusted as needed to accommodate fabrics or threads of different thicknesses, while also facilitating maintenance and replacement. The stop pad 29 reduces direct friction between the pressure plate 28 and the thread clamp cap 25, thereby reducing wear and extending the service life of the thread clamp 2.

[0075] In summary, the closed-loop controlled wire clamp provided by this utility model, when the electromagnet 5 is energized, moves the electromagnet shaft 51 towards the pressure sensor 42, causing the limit nut 8 to move synchronously, thereby compressing the tower spring. The electromagnet shaft 51 pushes the pressure sensor 42, the wire release rod 3, the wire release pin 22, and the inner wire clamping plate 24 towards the outer wire clamping plate 23. The inner wire clamping plate 24 and the outer wire clamping plate 23 are tightly fitted together, clamping the wire. At the same time, the compression spring 6 is compressed. The pressure sensor 42 detects the pressure in real time and transmits the data to the control device. The control device analyzes the data and adjusts the current through the electromagnet 5 in real time to control the clamping force on the wire. When the electromagnet 5 is de-energized, the tower spring returns to its original state, causing the electromagnet shaft 51 to move away from the wire clamping plate. The electromagnet shaft 51 separates from the pressure sensor 42, and the pressure sensor 42 reading returns to zero. The compressed spring 6 returns to its original state after losing the compressive force of the electromagnet shaft 51, pushing the inner wire clamping plate 24 to separate from the outer wire clamping plate 23, releasing the wire.

[0076] By adding a pressure sensor 42, the device can detect the actual pressure value in real time and compare it with the preset pressure value, thus achieving real-time control of the thread tension. This improves the stability and accuracy of the electronic thread clamp 2 and avoids the impact of component performance errors, production and installation errors, and transmission errors on the thread tension of the electronic thread clamp 2. The closed-loop control device can monitor and adjust the working status of the thread clamp 2 in real time. Even under conditions of component performance fluctuations or external interference, it can promptly correct deviations through a feedback mechanism, maintaining stable operation of the device. This effectively reduces downtime and defect rate caused by thread clamp 2 malfunctions, improving production efficiency and product quality. The closed-loop control device achieves automated control of the thread clamp 2, eliminating the need for manual adjustment of the thread clamp 2's tightness, greatly reducing the labor intensity of operators and improving the automation level of the sewing machine. At the same time, automated control ensures consistent thread clamping effect for each sewing operation, improving the standardization and normalization of production. By precisely controlling the action of the electromagnet 5 and the clamping force of the thread clamp 2, excessive wear or damage to components caused by excessive or insufficient clamping force is avoided. Furthermore, the closed-loop control device can promptly detect and correct abnormalities, reducing equipment malfunctions and thus extending the service life of the electronic thread clamp 2 and related components, thereby lowering equipment maintenance costs. Different fabric thicknesses and sewing processes require different levels of tension from the thread clamp 2. The closed-loop control device can quickly adapt to various fabrics and sewing needs based on real-time detected clamping force, achieving flexible adjustment and control, improving the versatility and applicability of the sewing machine, and enabling it to meet the needs of different customers and application scenarios. Precise thread clamping control ensures uniform thread tension during sewing, avoiding problems such as uneven stitches, skipped stitches, and thread breaks caused by improper thread clamping tension, thereby optimizing sewing results and improving sewing quality.

[0077] In addition to the closed-loop controlled thread clamp disclosed in the above embodiments, this utility model also provides a sewing machine including the above-mentioned closed-loop controlled thread clamp. For the structure of other parts of the sewing machine, please refer to the prior art, which will not be repeated here.

[0078] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0079] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0080] The above provides a detailed description of the closed-loop controlled thread clamp and sewing machine provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A closed-loop controlled wire clamp, characterized in that, include: The housing (1) and the wire clamp (2), wire release rod (3), pressure detection device (4) and electromagnet (5) arranged sequentially along the axial direction of the housing (1); The electromagnet (5) is used to drive the pressure detection device (4) and the slack rod (3) to move along the axial direction of the housing (1), and the pressure detection device (4) is used to detect the clamping force of the wire clamp (2) in real time. The wire clamp (2) includes a wire clamping rod shaft (21), a loosening pin (22) that slides along the inner wall of the wire clamping rod shaft (21), and an outer wire clamping piece (23) and an inner wire clamping piece (24) that slide along the outer wall of the wire clamping rod shaft (21). The end of the wire clamping rod shaft (21) away from the loosening rod (3) is provided with a wire clamp cap (25). The two ends of the loosening pin (22) abut against the loosening rod (3) and the inner wire clamping piece (24) respectively. A compression spring (6) is provided between the outer wire clamping piece (23) and the inner wire clamping piece (24). The compression spring (6) is used to provide a preload force to move the inner wire clamping piece (24) away from the outer wire clamping piece (23). A control device is connected to the electromagnet (5) and the pressure detection device (4) by signal. The control device is used to control the action of the electromagnet (5) according to the clamping force detected by the pressure detection device (4).

2. The closed-loop controlled wire clamp according to claim 1, characterized in that, The pressure detection device (4) includes a housing (41) and a pressure sensor (42) disposed inside the housing (41). The housing (41) has an opening for the electromagnet (5) to contact the pressure sensor (42).

3. The closed-loop controlled wire clamp according to claim 1, characterized in that, The electromagnet (5) is located at one end of the housing (1). The electromagnet (5) includes an electromagnet shaft (51), an iron core (52) and a body (53) arranged coaxially from the inside to the outside. The electromagnet shaft (51) and the iron core (52) are movably disposed on the body (53).

4. The closed-loop controlled wire clamp according to claim 3, characterized in that, The electromagnet shaft (51) extends from both ends of the main body (53). An elastic element (7) is provided at one end of the electromagnet shaft (51) away from the pressure detection device (4). The elastic element (7) is used to provide a preload force to move the electromagnet shaft (51) away from the pressure detection device (4).

5. The closed-loop controlled wire clamp according to claim 4, characterized in that, The elastic element (7) is a tower spring. The elastic element (7) is sleeved on the electromagnet shaft (51). The two ends of the elastic element (7) are respectively limited by the limiting nut (8) and the main body (53). A gasket (9) is provided between the main body (53) and the elastic element (7).

6. The closed-loop controlled wire clamp according to claim 5, characterized in that, The electromagnet shaft (51) has a baffle extending circumferentially at one end near the pressure detection device (4), and a buffer washer (10) is fitted on the electromagnet shaft (51), with the buffer washer (10) located between the baffle and the main body (53).

7. The closed-loop controlled wire clamp according to claim 1, characterized in that, The wire clamp (2) also includes a wire clamp seat (26) disposed in the housing (1), the wire clamp rod shaft (21) is fixed to the wire clamp seat (26), the wire clamp cap (25) is connected to the wire clamp rod shaft (21) through a head shaft (27), and the head shaft (27) has a limiting groove for installing the compression spring (6) at one end near the inner wire clamp piece (24), and the limiting groove extends along the axial direction of the head shaft (27).

8. The closed-loop controlled wire clamp according to claim 7, characterized in that, The clamping rod shaft (21) is also provided with a pressure plate (28). The end face of the pressure plate (28) near the clamp cap (25) is a conical surface. The outer edge of the end face of the pressure plate (28) near the outer clamping piece (23) is provided with an annular pressing part. The pressing part corresponds to the clamping part of the outer clamping piece (23).

9. The closed-loop controlled wire clamp according to claim 8, characterized in that, A stop pad (29) is provided between the wire clamp cap (25) and the pressure plate (28), and the stop pad (29) is slidably arranged along the wire clamp rod axis (21).

10. A sewing machine, characterized in that, The clamp includes the closed-loop controlled clamp as described in any one of claims 1-9.

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