Guide rail of inner shuttle frame, inner shuttle frame and rotating shuttle

Abstract

The utility model relates to the technical field of sewing machines, in particular to a guide rail of an inner shuttle frame, the inner shuttle frame and a rotating shuttle, which comprises a non-closed annular guide rail body with a self-lubricating wear-resistant function, a thread hooking head is arranged at one end of the annular guide rail body, and a thread loosening head is arranged at the other end of the annular guide rail body. The inner side face of the annular guide rail body is concavely provided with a mounting cavity and a plurality of meshing holes concavely formed in the side wall of the mounting cavity, and the meshing holes are distributed along the mounting cavity. The annular guide rail body has the self-lubricating and wear-resisting functions, the guide rail is firmly connected to the outer side wall of the inner shuttle body, and the guide rail on the inner shuttle body is high in position precision and good in stability.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a guide rail of an inner shuttle frame, an inner shuttle frame and a rotary shuttle. Background Art

[0002] The rotary hook is a vital component of a sewing machine. It consists of an inner and outer shuttle frames, which are connected by guide grooves within the outer frame and guide rails on the inner frame. The guide rails of the inner shuttle frame in the prior art are metal rails, requiring oil lubrication to reduce friction and wear during use. Among existing patents, Chinese patent application number 201610683414.8 discloses a detachable guide rail, an inner shuttle equipped with the guide rail, and a rotary hook device for a sewing machine equipped with the inner shuttle. The guide rail is an annular guide rail that is detachably mounted on the inner shuttle of the rotary hook device of a sewing machine. The guide rail is composed of a composite material containing non-thermoplastic polyimide and a filler material. Although non-thermoplastic polyimide has excellent strength, elasticity, and friction properties, since the guide rail is detachably mounted on the inner shuttle's annular guide rail, it is difficult to ensure the guide rail's secureness and positional accuracy on the inner shuttle's annular guide rail. Therefore, the drawbacks are significant, and a solution is urgently needed. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present utility model is to provide a guide rail of an inner shuttle rack, an inner shuttle rack and a rotary hook.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A guide rail for an inner shuttle frame includes a non-closed annular guide rail body with self-lubricating and wear-resistant functions, a thread hook head is provided at one end of the annular guide rail body, and a thread stripping head is provided at the other end of the annular guide rail body. The inner side surface of the annular guide rail body is recessed with an installation cavity and a plurality of engaging holes recessed from the side wall of the installation cavity, and the plurality of engaging holes are distributed along the installation cavity.

[0006] Furthermore, the annular guide rail body is made of a self-lubricating and wear-resistant polymer composite material.

[0007] Furthermore, the annular guide rail body is an annular guide rail body made of a polyetheretherketone composite material.

[0008] Furthermore, an embedding groove is provided on the inner side surface of the annular guide rail body, and the embedding groove is recessed from the side wall of the installation cavity.

[0009] The utility model also provides an inner shuttle frame, comprising an inner shuttle body and the above-mentioned guide rail, wherein the guide rail is fixedly connected to the outer side wall of the inner shuttle body.

[0010] Furthermore, the outer side wall of the inner shuttle body is provided with a non-closed annular connecting portion, a plurality of engaging blocks are protruding from the middle part of the annular connecting portion, the annular guide rail body is sleeved outside the annular connecting portion, the annular connecting portion is accommodated in the installation cavity, and the plurality of engaging blocks respectively extend into the plurality of engaging holes, and the engaging blocks engage with the engaging holes.

[0011] The utility model also provides a rotary shuttle, comprising an outer shuttle frame and the above-mentioned inner shuttle frame, the inner shuttle frame being rotatably arranged in the outer locking frame; the outer shuttle frame comprises an outer shuttle body of an integral structure, the middle part of the outer shuttle body is provided with a cavity, the side wall of the cavity is recessed with a guide groove and a mounting surface arranged on the top surface of the guide groove, the mounting surface is detachably provided with at least one arc-shaped limiting piece, the inner shuttle body is rotatably arranged in the cavity, the guide rail is slidably connected to the guide groove, the arc-shaped limiting piece is used to limit the guide rail in the guide groove, and the side wall of the outer shuttle body is provided with at least one dust exhaust hole connected to the guide groove.

[0012] Furthermore, the top edge of the outer shuttle body is provided with a thread pushing protrusion, a needle insertion groove located below the thread pushing protrusion and a needle guard surface connected to the needle insertion groove. The thread pushing protrusion is used to push the surface thread outward, the needle insertion groove is used for inserting the machine needle, and the needle guard surface is used to resist and limit the side of the machine needle.

[0013] Furthermore, a heat dissipation hole is provided on the bottom surface of the outer shuttle body, and the heat dissipation hole is communicated with the cavity; a mounting block is coaxially protruded in the middle of the bottom surface of the outer shuttle body, and the heat dissipation hole and the mounting block are staggered; a mounting hole is coaxially provided in the middle of the mounting block, and the mounting hole is installed in the shuttle shaft; the mounting block and / or the shuttle shaft are installed with an impeller.

[0014] Furthermore, a diamond-like carbon film layer is provided in the guide groove.

[0015] The beneficial effects of the present invention are as follows: the guide rail of the present application has the function of self-lubrication and wear resistance. Through the engagement of the engagement block with the engagement hole and the cooperation of the annular connection part with the installation cavity, the guide rail can be firmly connected to the outer wall of the inner shuttle body. The position accuracy of the guide rail on the inner shuttle body is high and the stability is good. The guide rail has the characteristics of self-lubrication and wear resistance, which makes the wear of the outer shuttle frame and the inner shuttle frame small, the service life is long, and oil-free self-lubrication is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the guide rail of the present utility model.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the inner shuttle frame of the present utility model.

[0018] Figure 3 This is a schematic diagram of the exploded structure of the inner shuttle frame of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotary hook of the utility model.

[0020] Figure 5 It is a schematic diagram of the exploded structure of the rotary hook of the utility model.

[0021] Figure 6 This is a schematic diagram of the exploded structure of the outer shuttle body and the impeller of the present utility model.

[0022] Figure 7 This is a schematic three-dimensional structure diagram of another structure of the impeller of the present invention.

[0023] Description of reference numerals:

[0024] 1. Annular guide rail body; 2. Thread hook; 3. Thread stripping head; 4. Mounting cavity; 5. Engagement hole; 6. Mounting groove; 7. Inner shuttle body; 8. Annular connecting part; 9. Engagement block; 10. Outer shuttle body; 11. Receiving cavity; 12. Guide groove; 13. Mounting surface; 14. Arc-shaped limit plate; 15. Dust discharge hole; 16. Thread pushing protrusion; 17. Pin insertion groove; 18. Pin protection surface; 19. Heat dissipation hole; 20. Mounting block; 21. Mounting hole; 22. Impeller; 23. Contoured sleeve; 24. Blade; 25. Recessed position; 26. Recessed groove. DETAILED DESCRIPTION

[0025] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0026] like Figures 1 to 6 As shown, the utility model provides a guide rail of an inner shuttle rack, which includes a non-closed annular guide rail body 1 with self-lubricating and wear-resistant functions, a thread hook head 2 is provided at one end of the annular guide rail body 1, and a thread stripping head 3 is provided at the other end of the annular guide rail body 1. The inner side surface of the annular guide rail body 1 is recessed with a mounting cavity 4 and a plurality of engaging holes 5 recessed from the side wall of the mounting cavity 4, and the plurality of engaging holes 5 are distributed along the mounting cavity 4.

[0027] The present invention further provides an inner shuttle frame, comprising an inner shuttle body 7 and the above-mentioned guide rail, wherein the guide rail is fixedly connected to the outer side wall of the inner shuttle body 7 .

[0028] In this embodiment, the outer wall of the inner shuttle body 7 is provided with a non-closed annular connecting portion 8, and a plurality of engaging blocks 9 are protruding from the middle of the annular connecting portion 8. The annular guide body 1 is sleeved outside the annular connecting portion 8, and the annular connecting portion 8 is accommodated in the mounting cavity 4. The plurality of engaging blocks 9 respectively extend into the plurality of engaging holes 5, and the engaging blocks 9 engage with the engaging holes 5.

[0029] The guide rail has self-lubricating and wear-resistant functions. Through the engagement of the engagement block 9 with the engagement hole 5 and the cooperation of the annular connecting portion 8 with the mounting cavity 4, the guide rail can be firmly connected to the outer wall of the inner shuttle body 7. The position of the guide rail on the inner shuttle body 7 has high precision and good stability. The guide rail has the characteristics of self-lubrication and wear resistance, which reduces the wear of the outer shuttle frame and the inner shuttle frame, extends the service life, and realizes oil-free self-lubrication.

[0030] In this embodiment, the annular guide rail body 1 is made of a self-lubricating, wear-resistant polymer composite material. Preferably, the annular guide rail body 1 is made of a polyetheretherketone composite material. Specifically, the polyetheretherketone composite material uses polyetheretherketone as the primary raw material, mixed with one or more of polytetrafluoroethylene propylene, molybdenum disulfide, and zirconium oxide, and then integrally injection-molded onto the annular connecting portion 8 according to the designed shape. This structural design provides the annular guide rail body 1 with excellent self-lubricating and wear-resistant properties.

[0031] In this embodiment, the inner side of the annular guide rail body 1 is provided with two mounting grooves 6, one located at the upper and lower sides of the mounting cavity 4. The mounting grooves 6 are recessed into the sidewall of the mounting cavity 4. The annular connecting portion 8 partially extends into the mounting grooves 6, further strengthening the connection between the annular guide rail body 1 and the inner shuttle body 7, thereby further strengthening the connection between the guide rail and the inner shuttle frame.

[0032] The present invention also provides a rotary hook, comprising an outer hook frame and the above-mentioned inner hook frame, the inner hook frame being rotatably arranged in the outer locking frame; the outer hook frame comprises an outer hook body 10 of an integral structure, a cavity 11 being provided in the middle of the outer hook body 10, a guide groove 12 and a mounting surface 13 being provided on the top end surface of the guide groove 12 on the side wall of the cavity 11, at least one arc-shaped limiting piece 14 being detachably mounted on the mounting surface 13, the inner hook body 7 being rotatably arranged in the cavity 11, the guide rail being slidably connected to the guide groove 12, the arc-shaped limiting piece 14 being used to limit the guide rail in the guide groove 12, and at least one dust exhaust hole 15 being communicated with the guide groove 12 on the side wall of the outer hook body 10. In actual use, the inner shuttle frame is installed in the cavity 11, and the guide rail of the inner shuttle frame is located in the guide groove 12. Then, the arc-shaped limiting piece 14 is installed on the mounting surface 13 by bolts, so that the arc-shaped limiting piece 14 limits the guide rail of the inner shuttle frame in the guide groove 12, preventing the inner shuttle frame from escaping from the cavity 11. When the inner shuttle frame and the outer shuttle body 10 rotate relative to each other, the guide rail rotates along the guide groove 12. During the process of the guide rail rotating in the guide groove 12, if there is dust such as thread lint and dust in the guide groove 12, the dust can be discharged outward from the dust discharge hole 15, ensuring that the inner shuttle frame can rotate smoothly and stably in the outer shuttle body 10, avoiding the problem of the inner shuttle frame being stuck due to dust being trapped in the guide groove 12. The dust discharge hole 15 also plays a certain role in heat dissipation.

[0033] In this embodiment, the top edge of the outer shuttle body 10 is provided with a thread-pushing protrusion 16, a needle insertion groove 17 located below the thread-pushing protrusion 16, and a needle guard surface 18 connected to the needle insertion groove 17. The thread-pushing protrusion 16 is used to push the upper thread outward, the needle insertion groove 17 is used to insert the sewing needle, and the needle guard surface 18 is used to contact and limit the side of the sewing needle. The thread-pushing protrusion 16 can push the upper thread outward, facilitating its removal; the needle guard surface 18 contacts and limits the side of the sewing needle to achieve the needle protection function.

[0034] In this embodiment, the bottom surface of the outer shuttle body 10 is provided with a heat dissipation hole 19, which communicates with the chamber 11. The heat dissipation hole 19 facilitates heat dissipation and the removal of dust from the outer shuttle body 10. A mounting block 20 is coaxially protruded from the center of the bottom surface of the outer shuttle body 10, with the heat dissipation hole 19 offset from the mounting block 20. A mounting hole 21 is coaxially provided in the center of the mounting block 20, which houses a shuttle shaft (not shown). When the sewing machine drives the shuttle shaft, the rotating shuttle shaft drives the outer shuttle body 10 in synchronous rotation. This structural design facilitates assembly, disassembly, and maintenance of the shuttle shaft and outer shuttle body 10. An impeller 22 is mounted on the mounting block 20 or / and the shuttle shaft. Depending on actual needs, the impeller 22 can be mounted on either the mounting block 20 or the shuttle shaft; however, it is also possible to mount the impeller 22 on both the mounting block 20 and the shuttle shaft. During actual use, the impeller 22 rotates synchronously with the mounting block 20 and the shuttle shaft. The rotating impeller 22 generates airflow, which is blown into the cavity 11 of the outer shuttle body 10 through the heat dissipation holes 19 and onto the outer surface of the outer shuttle body 10. This airflow not only achieves rapid air cooling and heat dissipation, but also blows away dust inside the outer shuttle body 10. Compared to the prior art that uses oil cooling, the present invention continuously utilizes air cooling during use, which not only saves resources and reduces operating costs, but also avoids the problem of oil contamination of the sewn fabric.

[0035] In this embodiment, a diamond-like carbon film layer is provided in the guide groove 12 to form a wear-resistant coating, which improves the wear resistance and hardness of the guide groove 12 and can improve the surface finish of the inner wall of the guide groove 12 to a certain extent.

[0036] like Figure 5 and Figure 6 As shown, in this embodiment, the mounting block 20 is provided with a plurality of recessed positions 25 around its periphery. The impeller 22 includes a contoured sleeve 23 that fits over the mounting block 20 and a plurality of blades 24 disposed around the contoured sleeve 23. Each blade 24 is positioned within a recessed groove 26 of the contoured sleeve 23. Specifically, the recessed positions 25 are distributed in an annular array around the mounting block 20. This structural design, due to the provision of the recessed positions 25, also provides recessed grooves 26 on the contoured sleeve 23 of the impeller 22. The blades 24 are positioned within the recessed grooves 26, which increases the area of ​​the blades 24, thereby increasing the air volume generated by the blades 24 and improving the efficiency of air cooling and heat dissipation.

[0037] like Figure 7 Specifically, in another embodiment, the mounting block 20 is cylindrical, and the impeller 22 includes a contoured sleeve 23 that fits over the mounting block 20 and a plurality of blades 24 disposed around the contoured sleeve 23. The contoured sleeve 23 is cylindrical. This structure of the mounting block 20 and impeller 22 is simple in structure and easy to manufacture.

[0038] All technical features in this embodiment can be freely combined according to actual needs.

[0039] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A guide rail for an inner shuttle rack, characterized in that: The invention comprises a non-closed annular guide rail body (1) with self-lubricating and wear-resistant functions, wherein a thread hooking head (2) is provided at one end of the annular guide rail body (1), and a thread stripping head (3) is provided at the other end of the annular guide rail body (1), and a mounting cavity (4) and a plurality of engaging holes (5) formed by recessing the side wall of the mounting cavity (4) are provided on the inner side surface of the annular guide rail body (1), and the plurality of engaging holes (5) are distributed along the mounting cavity (4).

2. The guide rail of the inner shuttle rack according to claim 1, characterized in that: The annular guide rail body (1) is made of a self-lubricating, wear-resistant polymer composite material.

3. The guide rail of the inner shuttle rack according to claim 1, characterized in that: The annular guide rail body (1) is an annular guide rail body (1) made of a polyetheretherketone composite material.

4. The guide rail of the inner shuttle rack according to claim 1, characterized in that: An embedding groove (6) is provided on the inner side surface of the annular guide rail body (1), and the embedding groove (6) is recessed from the side wall of the installation cavity (4).

5. An inner shuttle rack, characterized in that: The invention comprises an inner shuttle body (7) and a guide rail as claimed in any one of claims 1 to 4, wherein the guide rail is fixedly connected to the outer side wall of the inner shuttle body (7).

6. The inner shuttle rack according to claim 5, characterized in that: The outer side wall of the inner shuttle body (7) is provided with a non-closed annular connecting portion (8), a plurality of bite blocks (9) are protruding from the middle of the annular connecting portion (8), the annular guide rail body (1) is sleeved outside the annular connecting portion (8), the annular connecting portion (8) is accommodated in the mounting cavity (4), the plurality of bite blocks (9) respectively extend into the plurality of bite holes (5), and the bite blocks (9) bite into the bite holes (5).

7. A rotary hook, characterized in that: The invention comprises an outer shuttle frame and an inner shuttle frame as described in claim 5 or 6, wherein the inner shuttle frame is rotatably arranged in the outer lock frame; the outer shuttle frame comprises an outer shuttle body (10) of an integral structure, a cavity (11) is provided in the middle of the outer shuttle body (10), a guide groove (12) and a mounting surface (13) arranged on the top surface of the guide groove (12) are recessed on the side wall of the cavity (11), at least one arc-shaped limiting piece (14) is detachably installed on the mounting surface (13), the inner shuttle body (7) is rotatably arranged in the cavity (11), the guide rail is slidably connected to the guide groove (12), the arc-shaped limiting piece (14) is used to limit the guide rail in the guide groove (12), and the side wall of the outer shuttle body (10) is provided with at least one dust exhaust hole (15) connected to the guide groove (12).

8. The rotary hook according to claim 7, characterized in that: The top edge of the outer shuttle body (10) is provided with a thread pushing protrusion (16), a needle insertion groove (17) located below the thread pushing protrusion (16), and a needle protection surface (18) connected with the needle insertion groove (17); the thread pushing protrusion (16) is used to push the upper thread outward, the needle insertion groove (17) is used for inserting the machine needle, and the needle protection surface (18) is used to resist and limit the side of the machine needle.

9. The rotary hook according to claim 7, characterized in that: The bottom surface of the outer shuttle body (10) is provided with a heat dissipation hole (19), which is communicated with the cavity (11); a mounting block (20) is coaxially protruded in the middle of the bottom surface of the outer shuttle body (10), and the heat dissipation hole (19) and the mounting block (20) are staggered; a mounting hole (21) is coaxially provided in the middle of the mounting block (20), and a shuttle shaft is mounted in the mounting hole (21); and an impeller (22) is mounted on the mounting block (20) or / and the shuttle shaft.

10. The rotary hook according to claim 7, characterized in that: A diamond-like film layer is arranged in the guide groove (12).

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