Tightening device for lockstitch sewing machine
By designing a tensioning device with a plug, fixing plate, and spring structure, the problem of reduced clamping force caused by thermal deformation of the thread clamp was solved, achieving efficient and stable sewing results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-03-10
AI Technical Summary
The metal retaining plate of the thread clamp is prone to heat deformation under prolonged high-speed friction, which leads to a decrease in clamping force and affects the sewing effect.
Design a thread tensioning device for a flat sewing machine, which adopts a structure of insert rod, fixing plate, spring and guide rod. The clamping force is maintained by the repeated impact of the spring on the shaping plate to avoid deformation.
It effectively prevents the fixing plate from deforming due to heat, maintains efficient clamping force, and improves sewing accuracy and stability.
Smart Images
Figure CN223983819U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of flat bed sewing machine, in particular to a thread tensioning device for flat bed sewing machine. BACKGROUND
[0002] Flat bed sewing machine is a machine that uses a thread to form stitches on fabric, interlocking or joining one or more layers of fabric. It is the most basic type of sewing machine and is used to fix the thread, ensuring the neatness of the stitches.
[0003] A thread holder is a tool used to hold thread in place, commonly used in the sewing industry. It is typically made of high-strength plastic or metal and designed for portability and ease of use. The thread holder keeps materials fixed during sewing, cutting, and other manual activities, reducing errors and improving accuracy. However, the metal fixed pieces on both sides of the thread holder generate heat due to continuous high-speed friction with the sewing thread during long-term continuous work. Prolonged exposure to heat can cause deformation of the surface of the metal fixed pieces, affecting the clamping force of the sewing thread and reducing the processing effect.
[0004] Therefore, the skilled person in the art provides a thread tensioning device for flat bed sewing machine to solve the problems raised in the background art. CONTENT OF THE INVENTION
[0005] To solve the problems raised in the background art, the present application provides a thread tensioning device for flat bed sewing machine.
[0006] The thread tensioning device for flat bed sewing machine provided by the present application adopts the following technical scheme:
[0007] A thread tensioning device for flat bed sewing machine, comprising a plug rod, the plug rod is externally provided with a first fixed piece and a second fixed piece, respectively, wherein the first fixed piece is fixed to the outside of the plug rod, and the second fixed piece is sleeved outside the second fixed piece, the plug rod is sleeved with a baffle, the baffle is fixedly connected with a spring on the side, the spring is externally connected with a No. 2 shaping plate at one end, and the No. 2 shaping plate is attached to the side of the second fixed piece, the No. 2 shaping plate is provided with two guide rods on the side, and the two guide rods penetrate through the inside of the spring and the baffle.
[0008] Preferably, the plug rod is externally fixedly connected with an adjusting bare screw at one end away from the first fixed piece, and the adjusting bare screw is externally threadedly connected with a threaded sleeve.
[0009] Preferably, the adjusting bare screw is externally fixedly connected with a limiting plate at one end.
[0010] Preferably, two guide rods are installed with a horizontal plate between the ends.
[0011] Preferably, the plug rod is externally provided with a threaded hole at one end away from the limiting plate.
[0012] In summary, this application includes the following beneficial technical effects:
[0013] By pulling the two guide rods, the second shaping plate moves, causing the spring to compress and store energy. This allows the spring to rebound and strike the side of the second fixed plate after the control of the guide rods is lost. This process is repeated multiple times to strike the side of the second fixed plate. In conjunction with the fixed second fixed plate, the first and second fixed plates are continuously clamped together, which facilitates the shaping of the sides of the first and second fixed plates. This minimizes the risk of the first and second fixed plates deforming due to heat during long-term processing and maintains the efficient clamping force of the first and second fixed plates. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of the wire clamp body according to the embodiment of the application;
[0015] Figure 2 This is an example from the application. Figure 1 A structural diagram from a first-person perspective on the other side;
[0016] Figure 3 This is a cross-sectional structural diagram of the wire clamp baffle portion in the embodiment of the application.
[0017] Explanation of reference numerals in the attached drawings: 1. First fixing plate; 2. Second fixing plate; 3. Second shaping plate; 4. Spring; 5. Baffle; 6. Guide rod; 7. Horizontal plate; 8. Limiting plate; 9. Adjusting bare screw; 10. Threaded sleeve; 11. Insert rod. Detailed Implementation
[0018] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.
[0019] This application discloses a thread tensioning device for a flat sewing machine. (Refer to...) Figures 1-3 A thread tensioning device for a flat sewing machine includes an insert rod 11. A first fixing plate 1 and a second fixing plate 2 are respectively disposed opposite to each other on the outside of the insert rod 11. The first fixing plate 1 is fixed to the outside of the insert rod 11, and the second fixing plate 2 is sleeved on the outside of the second fixing plate 2. The sewing thread is clamped therein by the cooperation of the first fixing plate 1 and the second fixing plate 2. A baffle 5 is sleeved on the outside of the insert rod 11. A spring 4 is fixedly connected to the side of the baffle 5. A second shaping plate 3 is elastically connected to one end of the spring 4. The second shaping plate 3 is attached to the side of the second fixing plate 2. The spring 4 can apply a reverse force to the side of the second shaping plate 3 and the side of the second fixing plate 2 to provide clamping force for the sewing thread. Two guide rods 6 are provided circumferentially on the side of the second shaping plate 3, and both guide rods 6 pass through the inside of the spring 4 and the baffle 5.
[0020] By pulling the two guide rods 6 to move laterally, the moving guide rods 6 drive the second shaping plate 3 to move synchronously. Then, the control of the guide rods 6 can be released, causing the spring 4 to rebound and strike the side of the second fixed plate 2. This operation is repeated many times to strike the side of the second fixed plate 2. In cooperation with the fixed second fixed plate 2, the side of the first fixed plate 1 and the second fixed plate 2 are continuously clamped, which facilitates the shaping of the side of the first fixed plate 1 and the second fixed plate 2 and avoids the first fixed plate 1 and the second fixed plate 2 from being deformed by heat during long-term processing as much as possible.
[0021] Reference Figure 1 An adjusting bare screw 9 is fixedly connected to the end of the insert rod 11 away from the first fixing plate 1. A threaded sleeve 10 is threadedly connected to the outside of the adjusting bare screw 9. The threaded sleeve 10 can limit the position of the baffle 5 to ensure the stability of the baffle 5 outside the insert rod 11. At the same time, by rotating the threaded sleeve 10, the fixed position of the baffle 5 outside the insert rod 11 can be adjusted, thereby adjusting the force exerted by the spring 4 on the side of the second fixing plate 2, so as to better adapt to different specifications of sewing thread.
[0022] Reference Figure 1 A limiting plate 8 is fixedly connected to one end of the adjusting bare screw 9. The limiting plate 8 can limit the maximum movement of the threaded sleeve 10 to prevent the threaded sleeve 10 from separating from the adjusting bare screw 9.
[0023] Reference Figures 1-3 A horizontal plate 7 is installed between the ends of the two guide rods 6, which allows the staff to control the movement of the two guide rods 6 by external force.
[0024] Reference Figure 1 and Figure 2 The insertion rod 11 has a threaded countersunk hole at one end away from the limiting plate 8, which makes it easy for the end of the insertion rod 11 to be inserted into the mounting hole. The insertion rod 11 can be locked with screws, which facilitates the installation of the wire clamp.
[0025] The implementation principle of a thread tensioning device for a flat sewing machine according to an embodiment of this application is as follows:
[0026] After the first fixing plate 1 and the second fixing plate 2 have been in operation for a long time, the worker can use external force to overcome the reverse force of the spring 4 and pull the two guide rods 6 to move laterally. Then, the moving guide rods 6 drive the second shaping plate 3 to move synchronously. Immediately afterwards, the control of the guide rods 6 can be released, causing the spring 4 to rebound and hit the side of the second fixing plate 2. This operation is repeated many times to hit the side of the second fixing plate 2. In cooperation with the fixed second fixing plate 2, the first fixing plate 1 and the second fixing plate 2 are continuously clamped, which facilitates the shaping of the sides of the first fixing plate 1 and the second fixing plate 2. This avoids the first fixing plate 1 and the second fixing plate 2 from being deformed by heat during long-term processing and maintains the efficient clamping force of the first fixing plate 1 and the second fixing plate 2.
[0027] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.
[0028] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.
[0029] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A thread tensioning device for a lockstitch machine comprising a stud (11), characterized in that: The first fixed sheet (1) is fixed outside the inserting rod (11), and the second fixed sheet (2) is sleeved outside the second fixed sheet (2), the inserting rod (11) is sleeved with a baffle (5), the baffle (5) is fixedly connected with a spring (4) on the side, the spring (4) is elastically connected with a second shaping plate (3) on the outer end, and the second shaping plate (3) is attached to the side of the second fixed sheet (2), the side of the second shaping plate (3) is provided with two guide rods (6) in the circumferential direction, and the two guide rods (6) penetrate through the inside of the spring (4) and the baffle (5).
2. A thread tensioning device for a lockstitch sewing machine according to claim 1, characterized in that: The adjusting bare screw rod (9) is fixedly connected with a threaded sleeve (10) on the outer end.
3. A thread tensioning device for a lockstitch sewing machine according to claim 2, characterized in that: The adjusting bare screw rod (9) is fixedly connected with a limiting plate (8) on the outer end.
4. A thread tensioning device for a lockstitch sewing machine according to claim 1, characterized in that: Two guide rods (6) are installed between the end portions of the two guide rods (6).
5. A thread tensioning device for a lockstitch sewing machine according to claim 3, characterized in that: The inserting rod (11) is provided with a threaded counterbore away from the limiting plate (8) on the outer end.