Thread tensioner for a sewing machine

Abstract

The application provides a thread clamp of a sewing machine, comprising a thread clamp rod, a thread clamp seat, two thread clamp discs, a thread clamp spring and a thread clamp nut, an end surface of the thread clamp rod in an axial direction is provided with a cooling cavity containing cooling liquid, a plug is installed at an opening of the cooling cavity, and the cooling cavity extends along an axial direction of the thread clamp rod towards the direction of the installation position of the thread clamp disc. The thread clamp of the sewing machine provided by the application is provided with a cooling cavity at an axial end surface of the thread clamp rod, the cooling cavity is a blind hole structure, the cooling cavity is arranged along the axial direction of the thread clamp rod, and the opening of the cooling cavity is located at one end of the thread clamp rod close to the thread clamp seat. The plug is installed at the opening of the cooling cavity and is used for plugging the opening of the cooling cavity. Since the cooling cavity extends to the installation position of the two thread clamp discs, the cooling liquid in the cooling cavity can better exchange heat with the thread clamp rod and the two thread clamp discs, thereby taking away the heat generated by the sewing thread due to friction, effectively avoiding the melting or hardening of the sewing thread, and ensuring the strength and aesthetic appearance of sewing.

Description

Technical Field

[0001] This application belongs to the technical field of garment processing equipment, and more specifically, relates to a thread clamp for a sewing machine. Background Technology

[0002] Most existing sewing machines are equipped with a thread clamp, which consists of a thread clamping bar, a thread clamping seat, two thread clamping discs, a thread clamping spring, and a thread clamping nut arranged sequentially along the axial direction of the clamping bar. During use, the sewing thread passes between the two thread clamping discs. By rotating the thread clamping nut, the clamping force of the discs is adjusted, thereby regulating the tension and looseness of the sewing thread and enabling the sewing machine to operate normally. The friction between the sewing thread and the two thread clamping discs generates heat, which can cause the sewing thread to melt or harden, affecting the sewing strength and appearance. Utility Model Content

[0003] The purpose of this application is to provide a thread clamp for a sewing machine, which aims to solve the problem that existing thread clamps cause the sewing thread to melt or harden due to high temperatures.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a thread clamp for a sewing machine, comprising: a thread clamping rod, a thread clamping seat, two thread clamping discs, a thread clamping spring and a thread clamping nut, wherein a cooling chamber containing coolant is opened on the axial end face of the thread clamping rod, a plug is installed at the opening of the cooling chamber, and the cooling chamber extends along the axis of the thread clamping rod toward the mounting position of the thread clamping disc.

[0005] In one possible implementation, an inlet pipe and an outlet pipe are fixedly installed on the outer end face of the blockage.

[0006] In one possible implementation, a baffle is fixedly installed on the inner side of the blockage. The baffle is arranged along the length of the cooling chamber and divides the cooling chamber into an independent inlet chamber and an outlet chamber. The inlet pipe is connected to the inlet chamber and the outlet pipe is connected to the outlet chamber. A water passage hole is provided at the end of the baffle away from the blockage and is connected to the inlet chamber and the outlet chamber.

[0007] In one possible implementation, a notch is provided on the inner end face of the blockage to engage with the partition.

[0008] In one possible implementation, the end of the partition away from the blockage is provided with a support rod, and the inner wall of the cooling chamber is provided with an insertion hole that matches the support rod.

[0009] In one possible implementation, the baffle is provided with a baffle plate that is tilted in the opposite direction of the water flow.

[0010] In one possible implementation, a limiting pin is installed on the wire clamping seat, the limiting pin is parallel to the wire clamping rod, and limiting holes adapted to the limiting pin are opened on the two wire clamping discs.

[0011] In one possible implementation, the limiting hole is an oblong hole, and the limiting hole is arranged radially along the clamping rod.

[0012] In one possible implementation, the wire clamping disc includes a first wire clamping disc and a second wire clamping disc. The first wire clamping disc is close to the wire clamping base, and the wire clamping base has a magnet on its end face facing the first wire clamping disc. The wire clamping base uses the magnet to attract and fix the first wire clamping disc.

[0013] In one possible implementation, the top of the wire clamp is provided with a support block, the limiting pin is slidably engaged with the support block, the limiting pin has a degree of freedom to move along its own axis, the limiting pin is provided with a limiting flange, the limiting flange is located between the support block and the first wire clamping disc, the outer diameter of the limiting flange is larger than the outer contour of the limiting hole, a return spring is installed between the limiting flange and the support block, the return spring applies a force to the limiting flange toward the first wire clamping disc, thereby causing the limiting flange to abut against the first wire clamping disc.

[0014] Compared with the prior art, the thread clamp of a sewing machine according to the embodiments of this application has a cooling chamber on the axial end face of the thread clamping rod. The cooling chamber has a blind hole structure and is arranged along the axial direction of the thread clamping rod. The opening of the cooling chamber is located at the end of the thread clamping rod near the thread clamping seat. A plug is installed at the opening of the cooling chamber to seal the opening. Since the cooling chamber extends to the mounting position of the two thread clamping discs, the coolant in the cooling chamber can better exchange heat with the two thread clamping discs through the thread clamping rod, thereby removing the heat generated by the friction of the sewing thread, effectively preventing the sewing thread from melting or hardening, and ensuring the strength and aesthetics of the sewing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A three-dimensional structural diagram of a thread clamp for a sewing machine provided in this application embodiment. Figure 1 ;

[0017] Figure 2A three-dimensional structural diagram of a thread clamp for a sewing machine provided in this application embodiment. Figure 2 ;

[0018] Figure 3 An exploded view of a thread clamp for a sewing machine provided in an embodiment of this application;

[0019] Figure 4 Assembly diagram of the blockage and partition provided in the embodiments of this application;

[0020] Figure 5 A cross-sectional view of a thread clamp for a sewing machine provided in an embodiment of this application;

[0021] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0022] Figure 7 A perspective view of the blockage provided in an embodiment of this application.

[0023] In the diagram: 101, wire clamping rod; 102, wire clamping seat; 103, wire clamping spring; 104, wire clamping nut; 105, plug; 106, water inlet pipe; 107, water outlet pipe; 108, partition plate; 109, water inlet chamber; 110, water outlet chamber; 111, water passage hole; 112, slot; 113, support rod; 114, insertion hole; 115, baffle plate; 116, limiting pin; 117, limiting hole; 118, first wire clamping disc; 119, second wire clamping disc; 120, magnet; 121, support block; 122, limiting flange; 123, return spring; 124, loosening disc; 125, positioning groove. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] Please refer to the following: Figures 1 to 6 The present application provides a description of a thread clamp for a sewing machine. The thread clamp for a sewing machine includes: a thread clamping rod 101, a thread clamping seat 102, two thread clamping discs, a thread clamping spring 103, and a thread clamping nut 104. The axial end face of the thread clamping rod 101 has a cooling chamber filled with coolant. A plug 105 is installed at the opening of the cooling chamber. The cooling chamber extends along the axis of the thread clamping rod 101 towards the mounting position of the thread clamping discs.

[0026] This embodiment provides a thread clamp for a sewing machine. Compared with the prior art, a cooling chamber is provided on the axial end face of the thread clamping rod 101. The cooling chamber has a blind hole structure and is arranged along the axial direction of the thread clamping rod 101. The opening of the cooling chamber is located at the end of the thread clamping rod 101 near the thread clamping seat 102. A plug 105 is installed at the opening of the cooling chamber to seal the opening. Since the cooling chamber extends to the mounting positions of the two thread clamping discs, the coolant in the cooling chamber can better exchange heat with the two thread clamping discs through the thread clamping rod 101, thereby removing the heat generated by friction of the sewing thread, effectively preventing the sewing thread from melting or hardening, and ensuring the strength and aesthetics of the sewing.

[0027] The cooling chamber has a circular cross-section. The inner wall of the cooling chamber is provided with internal threads that connect to the plug 105.

[0028] In some embodiments, please refer to Figure 4 and Figure 5 An inlet pipe 106 and an outlet pipe 107 are fixedly installed on the outer end face of the plug 105. In this embodiment, the temperature of the coolant gradually increases after heat exchange, and the temperature difference between the coolant and the wire clamp becomes smaller, so the heat dissipation effect of the coolant on the wire clamp gradually decreases. To ensure the heat dissipation effect of the coolant on the wire clamp in the cooling chamber, the inlet pipe 106 and the outlet pipe 107 are installed on the plug 105. The water pump continuously delivers the low-temperature coolant to the cooling chamber through the inlet pipe 106, and the higher-temperature coolant in the cooling chamber after heat exchange is discharged through the outlet pipe 107, thereby keeping the coolant in the cooling chamber at a relatively low temperature and ensuring the heat dissipation effect on the wire clamp. Since both the inlet pipe 106 and the outlet pipe 107 are installed on the plug 105, they are easy to disassemble and assemble.

[0029] When maintenance or repair of the cooling system is required, simply unscrew the plug 105 that secures the inlet pipe 106 and the outlet pipe 107, and then remove the inlet pipe 106 and the outlet pipe 107 from the plug 105. This makes it very convenient to check for blockages, scale, or other impurities inside the pipes, as well as to clean or replace components inside the cooling chamber.

[0030] After completing the maintenance or repair work, accurately reinstall the inlet pipe 106 and outlet pipe 107 back onto the plug 105, ensuring a tight connection to prevent coolant leakage. The entire disassembly and assembly process is simple and efficient, greatly shortening maintenance time and improving equipment reliability and service life. Moreover, this convenient disassembly and assembly design allows the cooling system to be adjusted and optimized more flexibly in different working scenarios to adapt to various complex operating conditions.

[0031] In some embodiments, please refer to Figures 3 to 6A partition 108 is fixedly installed on the inner side of the plug 105. The partition 108 is arranged along the length of the cooling chamber, dividing the cooling chamber into an independent inlet chamber 109 and an outlet chamber 110. The inlet pipe 106 communicates with the inlet chamber 109, and the outlet pipe 107 communicates with the outlet chamber 110. A water passage hole 111 is provided at the end of the partition 108 away from the plug 105, communicating with both the inlet chamber 109 and the outlet chamber 110. In this embodiment, the partition 108 is a rectangular plate, arranged along the length of the cooling chamber. One end of the partition 108 along its length is fixedly installed on the plug 105, and the other end of the partition 108 along its length is attached to the inner wall of the cooling chamber along its length, thereby dividing the cooling chamber into an independent inlet chamber 109 and an outlet chamber 110. Since the inlet pipe 106 is connected to the inlet chamber 109 and the outlet pipe 107 is connected to the outlet chamber 110, and a water passage hole 111 is provided at the end of the partition 108 away from the blockage 105, the coolant enters the inlet chamber 109 through the inlet pipe 106, then enters the outlet chamber 110 through the water passage hole 111, and finally exits through the outlet pipe 107. The coolant flows in the U-shaped flow channel inside the clamp rod 101, thereby continuously carrying away the heat transferred from the clamp plate to the clamp rod 101 through heat conduction.

[0032] As the coolant continuously circulates, the heat transferred from the wire clamping plate to the wire clamping rod 101 is effectively and continuously removed. Simultaneously, to monitor the coolant temperature and flow rate, temperature sensors and flow sensors are installed on the inlet pipe 106 and outlet pipe 107, respectively. The temperature sensor provides real-time feedback on the temperature of the coolant entering and exiting the wire clamping rod 101. By comparing this temperature with a set threshold, any abnormalities in the cooling system can be detected promptly. The flow sensor accurately measures the coolant flow rate, ensuring it remains within a suitable range to guarantee stable cooling performance. If any abnormality in temperature or flow is detected, the system will issue an alarm promptly, alerting operators to perform inspection and maintenance, thereby ensuring the smooth operation of the entire production process.

[0033] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 7 A notch 112 is formed on the inner end face of the plug 105 to engage with the partition 108. In this embodiment, the notch 112 is formed on the inner wall of the plug 105. The notch 112 is arranged radially along the plug 105 and extends through the entire end face of the plug 105. One end of the partition 108 in the longitudinal direction is installed in the notch 112. The notch 112 positions the partition 108 and also improves the connection strength between the partition 108 and the plug 105. The partition 108 and the notch 112 are interference-fitted, thereby achieving a fixed connection between the partition 108 and the notch 112.

[0034] After the baffle 108 is installed within the slot 112, the entire structure becomes more stable. In actual use, this interference fit effectively prevents the baffle 108 from shaking or loosening inside the plug 105, ensuring its stable position under various operating conditions. For example, in environments subject to vibration or impact, the baffle 108 remains tightly fixed within the slot 112 without displacement, thus guaranteeing the normal operation of the entire device. Furthermore, because the slot 112 is radially arranged along the plug 105 and extends through the entire end face, the baffle 108 forms an effective partition structure within the plug 105, better enabling functional division between different areas. It plays a significant role in fluid diversion, obstruction, and spatial separation. This structural design not only improves the overall performance of the device but also enhances its reliability and durability, reducing the risk of failure due to component loosening or displacement. During long-term use, the connection strength between the baffle 108 and the plug 105 remains stable, providing a solid guarantee for the stable operation of the entire equipment.

[0035] In some embodiments, please refer to Figures 4 to 6 A support rod 113 is provided at the end of the partition 108 away from the blockage 105, and an insertion hole 114 matching the support rod 113 is provided on the inner wall of the cooling chamber. In this embodiment, the support rod 113 is a cylindrical rod, located at the center of the end of the partition 108 away from the blockage 105 and coaxially arranged with the blockage 105. The support rod 113 and the partition 108 are fixed by welding. An insertion hole 114 is provided on the inner wall of the cooling chamber along its length, and the insertion hole 114 is clearance-fitted with the support rod 113. The depth of the insertion hole 114 is greater than the length of the support rod 113. When the partition 108 is assembled in the cooling chamber, the support rod 113 is inserted into the insertion hole 114. Through the insertion fit between the support rod 113 and the insertion hole 114, the end of the partition 108 away from the blockage 105 is supported and limited, preventing the partition 108 from bending and deforming due to the impact of water flow, thus extending the service life of the partition 108.

[0036] Meanwhile, to ensure the airtightness of the cooling chamber, a sealing structure is also provided at the mating point between the insertion hole 114 and the support rod 113. This sealing structure prevents coolant from leaking out from the gap between the insertion hole 114 and the support rod 113, ensuring the normal operation of the cooling system. Specifically, the sealing structure uses an elastic sealing material, which is installed on the inner wall of the insertion hole 114. When the support rod 113 is inserted into the insertion hole 114, the sealing material is compressed and deformed, thus tightly adhering to the surface of the support rod 113, forming a good sealing effect.

[0037] In some embodiments, please refer to Figures 3 to 5A baffle plate 115 is provided on the baffle plate 108, and the baffle plate 115 is inclined in the opposite direction of the water flow. In this embodiment, the baffle plate 108 is arranged vertically, and the water inlet chamber 109 and the water outlet chamber 110 are located on the left and right sides of the baffle plate 108, respectively. The baffle plate 115 is welded and fixed to both sides of the baffle plate 108. The baffle plate 115 is inclined on the baffle plate 108, and its inclination direction is in the opposite direction of the water flow, thereby playing a turbulent role on the coolant, extending the path length of the coolant in the cooling chamber, and improving the heat exchange effect.

[0038] To better ensure the flow of coolant, turbulence structures are installed in both the inlet chamber 109 and the outlet chamber 110. The turbulence structure in the inlet chamber 109 consists of several baffles 115 spaced apart along the length of the inlet chamber 109. These baffles 115 create turbulence in the coolant entering the inlet chamber 109, resulting in a more uniform distribution within the chamber, increasing the contact area between the coolant and the inner wall of the cooling chamber, and enhancing heat exchange efficiency. Similarly, a similar turbulence structure is installed in the outlet chamber 110.

[0039] Once the coolant forms turbulence within the inlet chamber 109, it enters the outlet chamber 110 more efficiently through the water inlet 111. The water inlet 111 also features a special design: its inner wall is decorated with spiral-shaped flow-guiding patterns. This causes the coolant to form a rotating flow as it passes through the water inlet 111, further enhancing its fluidity and heat exchange efficiency.

[0040] In some embodiments, please refer to Figures 1 to 3 A limiting pin 116 is installed on the thread clamping base 102, and the limiting pin 116 is parallel to the thread clamping rod 101. Two thread clamping discs have limiting holes 117 that are adapted to the limiting pin 116. In this embodiment, the existing thread clamping discs are all fitted onto the thread clamping rod 101, so each thread clamping disc can rotate independently around the thread clamping rod 101. When the two thread clamping discs rotate relative to each other, the thread clamping discs will crush the sewing thread, causing the sewing thread to break. Therefore, a limiting pin 116 is installed on the support base, and limiting holes 117 are opened on the two thread clamping discs to engage with the limiting pin 116. The limiting pin 116 is a cylindrical pin. The limiting pin 116 is installed on the thread clamping base 102 along the axial direction of the thread clamping rod 101. Limiting holes 117 are opened on both thread clamping discs, and the limiting holes 117 engage with the limiting pin 116. The insertion and engagement between the limiting pin 116 and the limiting hole 117 ensures that the two thread clamping discs and the thread clamping base 102 remain relatively fixed, effectively preventing relative rotation between the two thread clamping discs and solving the problem of thread breakage.

[0041] Furthermore, to ensure the fitting accuracy between the limiting pin 116 and the limiting hole 117, the diameter tolerance of the limiting pin 116 is controlled within a very small range, allowing the two to fit tightly together. Moreover, during long-term use, the limiting pin 116 may be affected by wear and other factors, thus affecting its fitting effect with the limiting hole 117. Therefore, a high-strength, wear-resistant material is selected to make the limiting pin 116 to extend its service life.

[0042] In some embodiments, please refer to Figure 3 The limiting hole 117 is an elongated oval hole, and it is arranged radially along the clamping rod 101. In this embodiment, the limiting hole 117 is an elongated oval hole, and its length direction is consistent with the radial direction of the clamping rod 101. The width of the limiting hole 117 is consistent with the diameter of the limiting pin 116. Since the limiting pin 116 and the limiting hole 117 are in line contact, the resistance between the limiting pin 116 and the two clamping discs during installation is effectively reduced.

[0043] In some embodiments, please refer to Figure 3 and Figure 5 The wire clamping reel includes a first wire clamping reel 118 and a second wire clamping reel 119. The first wire clamping reel 118 is located near the wire clamping base 102. A magnet 120 is provided on the end face of the wire clamping base 102 facing the first wire clamping reel 118. The wire clamping base 102 uses the magnet 120 to attract and fix the first wire clamping reel 118. In this embodiment, both the first wire clamping reel 118 and the second wire clamping reel 119 are made of stainless steel. The first wire clamping reel 118 and the second wire clamping reel 119 have the same structure and are symmetrically arranged. There are multiple magnets 120, which are evenly distributed along the circumference of the wire clamping base 102. The wire clamping base 102 uses the magnets 120 to attract and fix the first wire clamping reel 118, thereby keeping the first wire clamping reel 118 and the wire clamping base 102 relatively fixed, effectively preventing the first wire clamping reel 118 from shaking during operation.

[0044] During wire clamping, the first clamping disc 118 and the second clamping disc 119 cooperate to firmly clamp the wire between them by applying a certain pressure. When it is necessary to adjust the clamping force, it can be achieved by adjusting the tightness of the clamping nut 104. To ensure that the clamping discs are not damaged by frequent wire clamping during long-term use, a wear-resistant coating is also applied to the surface of the clamping discs. This coating can effectively reduce the friction generated during wire clamping and extend the service life of the clamping discs.

[0045] In some embodiments, please refer to Figure 3The top of the wire clamping seat 102 is provided with a support block 121. A limiting pin 116 is slidably engaged with the support block 121. The limiting pin 116 has a degree of freedom to move along its own axis. A limiting flange 122 is provided on the limiting pin 116. The limiting flange 122 is located between the support block 121 and the first wire clamping disc 118. The outer diameter of the limiting flange 122 is larger than the outer contour of the limiting hole 117. A return spring 123 is installed between the limiting flange 122 and the support block 121. The return spring 123 applies a force to the limiting flange 122 toward the first wire clamping disc 118, thereby causing the limiting flange 122 to abut against the first wire clamping disc 118. In this embodiment, the support block 121 is welded and fixed to the top of the wire clamping seat 102. A guide hole matching the limiting pin 116 is provided on the support block 121. The guide hole is arranged along the axial direction of the wire clamping rod 101. The limiting pin 116 can slide within the guide hole. A limiting flange 122 is provided on the limiting pin 116, and the limiting flange 122 is located between the support block 121 and the first wire clamping plate 118. Since the outer diameter of the limiting flange 122 is larger than the outer contour of the limiting hole 117, the limiting flange 122 can prevent the limiting pin 116 from passing through the limiting hole 117 and falling out. The return spring 123 is a compression spring, which is fitted on the limiting pin 116. The two ends of the return spring 123 abut against the support block 121 and the limiting flange 122 respectively. Therefore, the return spring 123 applies a force to the limiting flange 122 toward the first wire clamping plate 118, so that the limiting flange 122 abuts against the end face of the first wire clamping plate 118, ensuring that the limiting pin 116, the wire clamping seat 102, and the first wire clamping plate 118 remain relatively stable.

[0046] In this embodiment, please refer to Figure 3 and Figure 5 A slack reel 124 is also fitted onto the clamping rod 101. The slack reel 124 is located between the second clamping reel 119 and the clamping spring 103. The clamping spring 103 is a compression spring and is fitted onto the clamping rod 101. The two ends of the clamping spring 103 abut against the slack reel 124 and the clamping nut 104, respectively. The inner diameter of the slack reel 124 matches the outer diameter of the clamping rod 101. The outer diameter of the slack reel 124 is smaller than that of the second clamping reel 119, but larger than that of the clamping spring 103. A positioning groove 125 is provided on the side wall of the spool 124 opposite to the clamping spring 103. The outer contour of the positioning groove 125 matches the outer contour of the clamping spring 103. The center of the positioning groove 125 is located on the axis of the spool 124. Therefore, the clamping spring 103 is placed in the positioning groove 125, so that the clamping spring 103 and the spool 124 remain coaxial, ensuring that the force exerted by the clamping spring 103 on the spool 124 is more balanced. The spool 124 is provided with a clearance groove to avoid the limiting pin 116.

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A thread clamp for a sewing machine, comprising: A wire clamping rod, a wire clamping seat, two wire clamping discs, a wire clamping spring, and a wire clamping nut, characterized in that a cooling cavity containing coolant is opened on the axial end face of the wire clamping rod, a plug is installed at the opening of the cooling cavity, and the cooling cavity extends along the axis of the wire clamping rod toward the mounting position of the wire clamping disc.

2. The thread clamp for a sewing machine as described in claim 1, characterized in that, An inlet pipe and an outlet pipe are fixedly installed on the outer end face of the blockage.

3. The thread clamp for a sewing machine as described in claim 2, characterized in that, A baffle is fixedly installed on the inner side of the blockage. The baffle is arranged along the length of the cooling cavity and divides the cooling cavity into an independent water inlet cavity and a water outlet cavity. The water inlet pipe is connected to the water inlet cavity, and the water outlet pipe is connected to the water outlet cavity. A water passage hole is opened at the end of the baffle away from the blockage, and the water passage hole is connected to the water inlet cavity and the water outlet cavity.

4. The thread clamp for a sewing machine as described in claim 3, characterized in that, The inner end face of the blockage is provided with a notch that can be inserted into the partition.

5. The thread clamp for a sewing machine as described in claim 3, characterized in that, The partition plate is provided with a support rod at the end opposite to the blockage, and the inner wall of the cooling chamber is provided with a socket that matches the support rod.

6. The thread clamp of a sewing machine as described in claim 3, characterized in that, The baffle is equipped with a baffle plate, which is tilted in the opposite direction of the water flow.

7. The thread clamp for a sewing machine as described in claim 1, characterized in that, The wire clamping base is equipped with a limiting pin, which is parallel to the wire clamping rod. The two wire clamping discs are provided with limiting holes that are adapted to the limiting pin.

8. The thread clamp for a sewing machine as described in claim 7, characterized in that, The limiting hole is an oblong hole, and the limiting hole is arranged radially along the clamping rod.

9. The thread clamp for a sewing machine as described in claim 7, characterized in that, The wire clamping disc includes a first wire clamping disc and a second wire clamping disc. The first wire clamping disc is close to the wire clamping base. The wire clamping base has a magnet on its end face facing the first wire clamping disc. The wire clamping base uses the magnet to attract and fix the first wire clamping disc.

10. The thread clamp of a sewing machine as described in claim 9, characterized in that, The top of the wire clamp is provided with a support block, and the limiting pin is slidably engaged with the support block. The limiting pin has a degree of freedom to move along its own axis. The limiting pin is provided with a limiting flange, which is located between the support block and the first wire clamping plate. The outer diameter of the limiting flange is larger than the outer contour of the limiting hole. A return spring is installed between the limiting flange and the support block. The return spring applies a force to the limiting flange toward the first wire clamping plate, thereby causing the limiting flange to abut against the first wire clamping plate.

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