Sewing machine
By setting coaxial thread take-up lever pin holes and adjusting shaft holes in the sewing machine, and adopting an eccentric thread take-up lever pin, the problems of low processing efficiency and poor precision in the existing technology are solved, and efficient and precise fabric sewing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-05
- Publication Date
- 2026-04-03
AI Technical Summary
The existing flat sewing machine has a non-coaxial setting of the adjustment shaft hole and the take-up lever pin hole, which results in low processing efficiency, large errors, and the shaking of the drilling tool affecting accuracy.
The lead-up rod pin hole and the adjustment shaft hole are designed to be set on the same axis, and the lead-up rod pin with an eccentric structure is machined at the same time by a single drilling tool. Combined with the eccentric section and the straight adjustment groove, the lead-up rod can be finely adjusted to adjust the lead supply, thereby enhancing rigidity and stability.
It enables coaxial cable processing, reduces equipment requirements, improves processing accuracy and efficiency, is suitable for sewing different fabrics, reduces drilling tool wobbling, and ensures stitch stability.
Smart Images
Figure CN224077682U_ABST
Abstract
Description
Technical fields:
[0001] This utility model belongs to the field of sewing equipment technology, and specifically refers to a sewing machine. Background technology:
[0002] A flatbed sewing machine primarily uses a single thread to create a stitch on the fabric, allowing one or more layers of fabric to interweave or sew together. It is generally divided into two types: one for thin materials and one for thick materials. Flatbed sewing machines can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products made of leather, plastic, and paper. Thin materials are generally used for knitwear, underwear, shirts, and uniforms, while thick materials are generally used for various sportswear, denim, fashion apparel, coats, shoes, hats, leather goods, and bags.
[0003] The adjustment shaft hole and thread take-up lever pin hole on the existing flatbed sewing machine housing are not coaxially aligned. Both are machined in two steps. When machining the adjustment shaft hole, drilling must begin from the rear end of the housing and proceed towards the front. Because the adjustment shaft hole is far from the rear end, the drilling tool requires high precision and is prone to wobbling, affecting the machining accuracy of the adjustment hole. The thread take-up lever pin hole can be drilled from the front end of the housing towards the rear. This machining method has the following drawbacks: it requires two workpiece flips and repositionings, resulting in low machining efficiency; and it involves two clamping operations, leading to large machining errors. Summary of the Invention:
[0004] The purpose of this invention is to provide a sewing machine that can simultaneously process the adjustment shaft hole and the take-up lever pin hole.
[0005] This utility model is implemented as follows:
[0006] A sewing machine includes a machine housing and a take-up lever pin. The machine housing has a take-up lever pin hole and an adjustment shaft hole. The diameter of the take-up lever pin hole is greater than or equal to the diameter of the adjustment shaft hole, and the take-up lever pin hole and the adjustment shaft hole are coaxially arranged. The take-up lever pin includes a take-up lever pin body and an eccentric section eccentrically arranged at one end of the take-up lever pin body. The eccentric section is parallel to the axis of the take-up lever pin body. The take-up lever pin body is disposed in the take-up lever pin hole, and the eccentric section is connected to a take-up lever assembly.
[0007] In the sewing machine described above, one end of the take-up lever pin body is provided with a straight adjustment groove.
[0008] In the sewing machine described above, a flat surface is provided on the outer cylindrical surface of the take-up lever pin body. Screws are screwed onto the machine housing and abut against the flat surface to fix the take-up lever pin body to the machine housing.
[0009] In the aforementioned sewing machine, the thread take-up lever assembly includes a thread take-up frame, one end of which is rotatably connected to an eccentric section and the other end of which is provided with a forked portion. The middle part of the thread take-up lever is located in the forked portion and is rotatably connected to the other end of the thread take-up frame via a pin. The upper end of the thread take-up lever is suspended and has a thread hole at that end. The lower end of the thread take-up lever is provided with a bearing, which is hinged to the needle bar crank via a pin and a connecting rod.
[0010] In the aforementioned sewing machine, the take-up lever is divided into an upper part and a lower part according to its thickness, with the upper part being thinner than the lower part, and the lower part being located at one end near the upper part within the forked section.
[0011] The outstanding advantages of this utility model compared to the prior art are:
[0012] 1. This utility model features a coaxial arrangement of the take-up lever pin hole and the adjusting shaft hole. By simply configuring the take-up lever pin as an eccentric structure, connection to the take-up lever assembly can be achieved. Furthermore, both the take-up lever pin hole and the adjusting shaft hole can be machined simultaneously using a single drilling tool, eliminating the need for two clamping operations. Simultaneously, machining begins from the take-up lever pin hole, compared to existing technologies that start from the rear of the housing, shortening the machining distance, reducing the requirements on the machining equipment, and avoiding reduced machining accuracy due to wobbling caused by an excessively long drilling tool.
[0013] 2. The eccentric structure of the thread take-up lever pin of this utility model can finely adjust the up and down position of the thread take-up lever to adjust the amount of thread supplied, and is suitable for sewing different fabrics. Attached image description:
[0014] Figure 1 This is a schematic diagram of the present invention;
[0015] Figure 2 yes Figure 1 A magnified view of a portion of the image;
[0016] Figure 3 This is one of the schematic diagrams of the casing of this utility model;
[0017] Figure 4 This is the second schematic diagram of the casing of this utility model;
[0018] Figure 5 This is a schematic diagram of the line take-up lever assembly of this utility model;
[0019] Figure 6 This is one of the schematic diagrams of the line take-up lever pin of this utility model;
[0020] Figure 7 This is the second schematic diagram of the line-taking lever pin of this utility model.
[0021] In the diagram: 1. Housing; 2. Thread take-up lever pin; 3. Thread take-up lever pin hole; 4. Adjustment shaft hole; 5. Thread take-up lever pin body; 6. Eccentric section; 7. Adjustment groove; 8. Thread take-up lever; 9. Thread take-up frame; 10. Fork section; 11. Pin shaft; 12. Thread hole; 13. Bearing; 14. Strip hole; 15. Plane. Detailed implementation method:
[0022] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —7:
[0023] This utility model provides a sewing machine, which includes a machine housing 1 and a thread take-up lever pin 2. The machine housing 1 has a thread take-up lever pin hole 3 and an adjusting shaft hole 4. The diameter of the thread take-up lever pin hole 3 is greater than or equal to the diameter of the adjusting shaft hole 4. In this embodiment, the diameters of the thread take-up lever pin hole 3 and the adjusting shaft hole 4 are equal, and the thread take-up lever pin hole 3 and the adjusting shaft hole 4 are coaxially aligned. This arrangement of the thread take-up lever pin hole 3 and the adjusting shaft hole 4 allows for simultaneous machining of both using a single drilling tool, eliminating the need for two clamping operations. Furthermore, machining begins from the thread take-up lever pin hole 3, compared to the prior art which starts machining from the rear end of the machine housing. This shortens the machining distance, reduces the requirements on the machining equipment, and avoids reduced machining accuracy due to the shaking of an excessively long drilling tool.
[0024] To accommodate the thread take-up lever pin hole 3, this utility model also modifies the structure of the thread take-up lever pin 2. Specifically, the thread take-up lever pin 2 includes a thread take-up lever pin body 5 and an eccentric section 6 eccentrically disposed at one end of the thread take-up lever pin body 5. The eccentric section 6 is parallel to the axis of the thread take-up lever pin body 5. The thread take-up lever pin body 5 is disposed within the thread take-up lever pin hole 3. A flat surface 15 is provided on the outer cylindrical surface of the thread take-up lever pin body 5. Screws are screwed onto the housing 1 and abut against the flat surface 15 to fix the thread take-up lever pin body 5 to the housing 1. The eccentric section 6 is connected to the thread take-up lever assembly.
[0025] By setting the eccentricity of the take-up rod pin 2, the position of the eccentric section 6 can be adjusted to adapt to the connection of the take-up rod assembly.
[0026] To facilitate the rotation of the take-up lever pin 2, a slotted adjustment groove 7 is provided at one end of the take-up lever pin body 5 of this invention. By using a tool (such as a flathead screwdriver) to rotate the take-up lever pin 2 through the adjustment groove 7, the up and down position of the take-up lever 8 can be finely adjusted to adjust the amount of thread supplied, which is suitable for sewing different fabrics.
[0027] Furthermore, the thread take-up lever assembly of this utility model includes a thread take-up frame 9. One end of the thread take-up frame 9 is rotatably connected to the eccentric section 6, and the other end is provided with a forked portion 10. To prevent the axial movement of the thread take-up frame 9, a limiting component, such as a retaining spring, can be used on the eccentric section 6 to limit the movement of the thread take-up frame 9. The middle part of the thread take-up lever 8 is located in the forked portion 10 and is rotatably connected to the other end of the thread take-up frame 9 through a pin 11. The upper end of the thread take-up lever 8 is suspended and has a thread hole 12 at that end. The lower end of the thread take-up lever 8 is provided with a bearing 13, which is hinged to the needle bar crank through a connecting shaft and a connecting rod. Specifically, the connecting shaft passes through the inner ring of the bearing 13 and extends out of the bearing 13. The extended part is connected to the needle bar crank through a connecting rod. It should be noted that the thread take-up frame 9 is connected to the pin 11 of the thread take-up lever 8 through the forked portion 10 to form a double support structure, which enhances the rigidity of the thread take-up lever 8, reduces swaying during high-speed movement, and ensures the stability of the stitch.
[0028] The upper part of the take-up rod 8 is thinner than the lower part, and the lower end near the upper part is located inside the fork portion 10. The upper part of the take-up rod 8 extends out of the slotted hole 14 on the housing 1, and the size of the slotted hole 14 is usually fixed. Therefore, the upper size is adapted to the size of the slotted hole 14, while the increased thickness at the lower part can improve the connection strength between the pin 11, the take-up rod 8, and the take-up frame 9.
[0029] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.
Claims
1. A sewing machine comprising a casing (1), a thread take-up lever pin (2), a thread take-up lever pin hole (3) and an adjustment shaft hole (4) provided in the casing (1), characterized in that: The diameter of the thread lever pin hole (3) is greater than or equal to the hole diameter of the adjusting shaft hole (4), and the thread lever pin hole (3) and the adjusting shaft hole (4) are coaxially arranged, the thread lever pin (2) comprises a thread lever pin body (5) and an eccentric section (6) eccentrically arranged at one end of the thread lever pin body (5), the eccentric section (6) is arranged in parallel with the axis of the thread lever pin body (5), the thread lever pin body (5) is arranged in the thread lever pin hole (3), and the eccentric section (6) is connected with the thread lever assembly.
2. A sewing machine according to claim 1, characterized in that: One end of the thread lever pin body (5) is provided with a one-word type adjusting groove (7).
3. A sewing machine according to claim 1 or 2, characterised in that: A flat surface (15) is arranged on the outer cylindrical surface of the thread lever pin body (5), a screw is screwed on the casing (1) and abuts against the flat surface (15) to fixedly connect the thread lever pin body (5) and the casing (1).
4. A sewing machine according to claim 1 or 2, characterised in that: The thread lever assembly comprises a thread lever frame (9), one end of the thread lever frame (9) is rotatably connected with the eccentric section (6), the other end of the thread lever frame (9) is provided with a bifurcated part (10), the middle part of the thread lever (8) is arranged in the bifurcated part (10) and rotatably connected with the other end of the thread lever frame (9) through a pin shaft (11), the upper end of the thread lever (8) is suspended and provided with a threading hole (12) at the end, the lower end of the thread lever (8) is provided with a bearing (13), and the bearing (13) is hingedly connected with the needle bar crank through a pin shaft and a connecting rod.
5. A sewing machine according to claim 4, characterised in that: The thread lever (8) is divided into an upper part and a lower part according to the thickness, and the thickness of the upper part is less than that of the lower part, and one end of the lower part close to the upper part is arranged in the bifurcated part (10).