Dry shuttle mechanism for a sewing machine

Abstract

The utility model belongs to the technical field of sewing machine relates to a dry type shuttle mechanism of sewing machine, including shuttle bed, shuttle frame and shuttle skin, the inside of shuttle bed is provided with guide rail groove, the shuttle frame sets up in the shuttle bed and its guide rail assembly is in guide rail groove, the shuttle skin is fixed in the outside of shuttle bed along the circumference pasting formula, the pasting surface of shuttle bed and shuttle skin is provided with oil storage groove, the fixed seal structure of oil storage groove of shuttle skin and shuttle bed, the inside of oil storage groove is filled with solid grease, the bottom of oil storage groove is provided with through -hole of intercommunication guide rail groove. The dry type shuttle mechanism of sewing machine provided by the utility model has the advantages that the structure is simple, oil supply is controllable, and the problem of oil stains can be avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machines, and relates to a dry rotary hook mechanism for a sewing machine. Background Technology

[0002] Rotary hooks are widely used in industrial flatbed sewing machines. Due to the long-term high-speed sewing of rotary hooks, more friction and a certain temperature rise are generated.

[0003] To cool the rotary hook, white oil is usually used for lubrication to ensure the sewing machine operates normally, but this also brings the problem of oil stains. As the quality requirements for clothing become increasingly stringent, some scenarios cannot tolerate oil stains, especially for high-end clothing and some precious fabrics. Oil stains can greatly reduce the quality of clothing, resulting in a large number of defective products and causing losses to clothing manufacturers.

[0004] In the existing technology, oil-free rotary hooks do not mean that there is absolutely no oil, but rather that the amount of oil is less than normal, achieving basic lubrication and sufficient to avoid the process conditions of oil staining the fabric. In other words, the problem of oil staining is eliminated by reducing the oil supply, which is between fabric contamination and lubricating oil stains.

[0005] Chinese invention patent CN107254746A (publication date: 2017-10-17) discloses a lubrication structure for a sewing machine shuttle, including a shuttle, a shuttle shaft, and a bushing. The shuttle and the bushing are both fitted onto the shuttle shaft. The bushing has an oil inlet hole. The lubrication structure includes an oil reservoir, an oil line one, and an oil line two. The inner end of the oil line one is connected to the oil outlet of the oil reservoir. The inner end of the oil line two is connected to the oil inlet hole of the bushing. The outer end of the oil line two is connected to an oil cut-off seat. The lubrication structure also includes a driving component connected to the oil cut-off seat. The driving component can drive the oil cut-off seat to move back and forth and make the outer end of the oil line two contact or separate from the outer end of the oil line one.

[0006] The aforementioned rotary hook, by setting an oil cut-off seat, can effectively prevent excessive oil seepage or leakage from the rotary hook when the sewing machine stops working. However, it cannot solve the problem of oil stains generated by the rotary hook during operation. Utility Model Content

[0007] This invention addresses the shortcomings of existing technologies by providing a dry rotary hook mechanism for sewing machines, which has the advantages of simple structure and controllable oil supply, thus avoiding oil stain problems.

[0008] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0009] A dry rotary shuttle mechanism for a sewing machine includes a shuttle bed, a shuttle frame, and a shuttle skin. The inner side of the shuttle bed is provided with a guide rail groove. The shuttle frame is disposed inside the shuttle bed and its guide rail is assembled in the guide rail groove. The shuttle skin is circumferentially fixed to the outer side of the shuttle bed. An oil storage groove is provided on the contact surface between the shuttle bed and the shuttle skin. After the shuttle skin is fixed to the shuttle bed, it forms a sealed structure for the oil storage groove. The oil storage groove is filled with solid grease. A through hole communicating with the guide rail groove is provided at the bottom of the oil storage groove.

[0010] In the dry rotary hook mechanism of the sewing machine described above, the oil reservoir is arranged circumferentially and its horizontal cross-section is arc-shaped; preferably, each part of the oil reservoir has the same depth.

[0011] In the dry rotary hook mechanism of the sewing machine described above, the through hole is located at one end of the oil storage tank. The through hole is a round hole or an arc-shaped elongated hole with the extension direction consistent with the oil storage tank; the extension direction refers to extending in the circumferential direction.

[0012] In the dry rotary shuttle mechanism of the sewing machine described above, the shuttle skin is detachably connected to the shuttle bed by screws.

[0013] In the dry rotary hook mechanism of the sewing machine described above, the filling volume of the solid grease is 70-90% of the volume of the oil storage tank.

[0014] In the dry rotary hook mechanism of the sewing machine described above, the solid grease is a commonly used grease in the art, such as lithium-based grease, complex lithium-based grease, polyurea-based grease, molybdenum disulfide grease, silicone-based grease, etc.; preferably, the solid grease is molybdenum disulfide grease, lithium-based grease or complex lithium-based grease.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This invention provides a dry rotary hook mechanism for a sewing machine. An oil reservoir is provided on the outer circumference of the shuttle bed, forming a sealed structure with the shuttle skin. The reservoir is filled with slowly releasing solid grease, which is gradually released into the guide rail groove, thus achieving a micro-level and controllable supply of lubricating oil to the rotary hook. This meets the cooling, lubrication, and wear prevention requirements of the rotary hook during operation without producing oil stains, resulting in superior sewing quality. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 yes Figure 1 Exploded view;

[0019] Figure 3 This is a perspective view of the shuttle bed of this utility model;

[0020] Reference numerals in the attached diagram: 1. Shuttle bed; 2. Shuttle frame; 3. Shuttle skin; 4. Guide rail groove; 5. Guide rail; 6. Oil reservoir; 7. Solid grease; 8. Through hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0022] A dry rotary shuttle mechanism for a sewing machine includes a shuttle bed 1, a shuttle frame 2, and a shuttle skin 3. The inner side of the shuttle bed 1 is provided with a guide rail groove 4. The shuttle frame 2 is disposed inside the shuttle bed 1 and its guide rail 5 is assembled in the guide rail groove 4. The shuttle skin 3 is circumferentially fixed to the outer side of the shuttle bed 1. An oil storage groove 6 is provided on the contact surface between the shuttle bed 1 and the shuttle skin 3. After the shuttle skin 3 is fixed to the shuttle bed 1, it forms a sealed structure of the oil storage groove 6. The oil storage groove 6 is filled with solid grease 7. A through hole 8 communicating with the guide rail groove 4 is provided at the bottom of the oil storage groove 6.

[0023] Comparison Appendix Figure 1 and attached Figure 2 During the operation of the rotary hook, solid grease 7 is slowly released and continuously supplied to the guide rail groove 4. It then spreads to the entire friction area as the rotary hook rotates, cooling the rotary hook during operation and reducing wear.

[0024] Comparison Appendix Figure 3 In this embodiment, preferably, the oil storage tank 6 is arranged circumferentially and its horizontal cross-section is arc-shaped; preferably, each part of the oil storage tank 6 has the same depth.

[0025] Preferably, the through hole 8 is provided at one end of the oil storage tank 6, and the through hole 8 is a round hole or an arc-shaped elongated hole with the same extension direction as the oil storage tank 6; the extension direction refers to extending in the circumferential direction.

[0026] In this embodiment, the solid grease 7 is added through the following structure: the shuttle skin 3 is detachably connected to the shuttle bed 1 by screws. By disassembling the shuttle skin 3, the oil storage tank 6 can be exposed, and then the solid grease 7 is injected. Finally, the shuttle skin 3 is re-fixed to form a sealed structure. Generally speaking, the solid grease 7 in this embodiment is added once every 500 working hours.

[0027] Preferably, the filling volume of the solid grease 7 is 70-90% of the volume of the oil storage tank 6. The above filling volume can prevent excess grease from leaking and causing oil stains.

[0028] The solid grease 7 mentioned above uses commonly used greases in the art, such as lithium-based grease, complex lithium-based grease, polyurea-based grease, molybdenum disulfide grease, and silicone-based grease; preferably, the solid grease 7 uses molybdenum disulfide grease, lithium-based grease, or complex lithium-based grease.

[0029] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A dry rotary shuttle mechanism for a sewing machine, comprising a shuttle bed (1), a shuttle frame (2), and a shuttle skin (3), wherein the inner side of the shuttle bed (1) is provided with a guide rail groove (4), the shuttle frame (2) is disposed within the shuttle bed (1) and its guide rail (5) is assembled in the guide rail groove (4), and the shuttle skin (3) is circumferentially fixed to the outer side of the shuttle bed (1), characterized in that, An oil storage tank (6) is provided on the mating surface of the shuttle bed (1) and the shuttle skin (3). After the shuttle skin (3) and the shuttle bed (1) are fixed, a sealed structure of the oil storage tank (6) is formed. The oil storage tank (6) is filled with solid grease (7). A through hole (8) connecting the guide rail groove (4) is provided at the bottom of the oil storage tank (6).

2. The dry rotary hook mechanism of a sewing machine according to claim 1, characterized in that, The oil storage tank (6) is arranged circumferentially, and its horizontal cross-section is arc-shaped.

3. The dry rotary hook mechanism of a sewing machine according to claim 2, characterized in that, The through hole (8) is provided at one end of the oil storage tank (6). The through hole (8) is a round hole or an arc-shaped elongated hole with the same extension direction as the oil storage tank (6).

4. The dry rotary hook mechanism of a sewing machine according to claim 1, characterized in that, The shuttle skin (3) is detachably connected to the shuttle bed (1) by screws.

5. The dry rotary hook mechanism of a sewing machine according to claim 1, characterized in that, The solid grease (7) fills 70-90% of the volume of the oil storage tank (6).

6. The dry rotary hook mechanism of a sewing machine according to claim 1, characterized in that, The solid grease (7) is a molybdenum disulfide grease, a lithium-based grease, or a composite lithium-based grease.

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