Self-lubricating inner shuttle, rotating shuttle assembly and sewing machine

Abstract

The application relates to a self-lubricating inner shuttle, a rotating shuttle assembly and a sewing machine, which comprises an inner shuttle body, the inner shuttle body is provided with a track structure, the outer side of the track structure comprises a main guide surface, a first side guide surface and a second side guide surface; a plurality of arrangement grooves are arranged at intervals along the length direction of the track structure, and a self-lubricating part is inlaid in the arrangement grooves; the self-lubricating part is provided with a self-lubricating surface matched with the outer side of the track structure. The application has the effects of improving the wear resistance of the track and reducing the maintenance cost in the later period.

Description

Technical Field

[0001] This application relates to the field of sewing machine equipment, and in particular to a self-lubricating inner shuttle, rotary shuttle assembly, and sewing machine. Background Technology

[0002] The inner shuttle, as a key component of a sewing machine, directly affects the machine's operational stability and sewing quality. In related technologies, to ensure the normal operation of the inner shuttle, regular lubrication is typically used to reduce friction between the track structure and other components. This method requires regular maintenance by the operator. Regarding the aforementioned technologies, the inventor believes that regularly adding lubricating oil is not only cumbersome but also prone to leakage, contaminating the sewing material. Utility Model Content

[0003] To improve the wear resistance of the track and reduce its later maintenance costs, this application provides a self-lubricating inner shuttle, a rotary shuttle assembly, and a sewing machine.

[0004] Firstly, this application provides a self-lubricating inner shuttle, employing the following technical solution: A self-lubricating inner shuttle includes an inner shuttle body with a track structure. The outer surface of the track structure includes a main guide surface, a first side guide surface, and a second side guide surface. The track structure is provided with a plurality of arrangement slots at intervals along its length, and a self-lubricating component is embedded in the arrangement slots. The self-lubricating component has a self-lubricating surface adapted to the outer surface of the track structure.

[0005] By adopting the above technical solution, a self-lubricating component is embedded in the arrangement groove of the track structure, and the self-lubricating surface of the self-lubricating component is adapted to the outer surface of the track structure. When the inner shuttle is working, the self-lubricating surface of the self-lubricating component directly contacts the rotating groove structure of the outer shuttle body or forms a lubricating layer in the tiny gap, thereby achieving continuous and automatic lubrication, reducing the need for additional oil injection, helping to improve the wear resistance of the track and reduce its later maintenance costs. The self-lubricating design reduces the risk of oil droplet splashing or leakage that may occur with oil lubrication, thereby reducing oil stains on the fabric and helping to improve the cleanliness of the sewing machine and the quality of the fabric.

[0006] Optionally, the arrangement groove includes a main arrangement groove formed on the main guiding surface; the self-lubricating element includes a main lubricating element arranged in the main arrangement groove; the main lubricating element has a main lubricating surface adapted to the main guiding surface.

[0007] By adopting the above technical solution, a main arrangement groove is opened on the main leading surface that bears the main friction and load, and a suitable main lubrication component is arranged. This can achieve targeted self-lubrication of the main leading surface, improve the wear resistance and smooth operation of the main leading surface, and reduce frictional resistance and energy loss.

[0008] Optionally, the arrangement groove includes a first arrangement groove formed on the first side guide surface and a second arrangement groove formed on the second side guide surface; the self-lubricating element includes a first lubricating element arranged in the first arrangement groove and a second lubricating element arranged in the second arrangement groove; the first lubricating element has a first lubricating surface adapted to the first side guide surface; the second lubricating element has a second lubricating surface adapted to the second side guide surface.

[0009] By adopting the above technical solution, the first side guide surface and the second side guide surface are mainly responsible for the axial positioning and guidance of the inner shuttle. On the basis of lubrication of the main guide surface, the first lubricating element and the second lubricating element are respectively set on the first side guide surface and the second side guide surface, which increases the self-lubricating surface and can effectively reduce the friction between the first side guide surface and the second side guide surface and other components, thereby improving the smoothness of operation and service life of the self-lubricating inner shuttle.

[0010] Optionally, the first arrangement slot and the second arrangement slot are arranged in a one-to-one correspondence, the first arrangement slot and the second arrangement slot are connected and constitute a third arrangement slot, and the first lubricating element and the second lubricating element are integrally formed and constitute a third lubricating element.

[0011] By adopting the above technical solution, the arrangement grooves of the first and second side guide surfaces are connected and an integrated self-lubricating component design is used, which significantly simplifies the manufacturing and assembly difficulty of the self-lubricating component, improves the structural stability of the self-lubricating component, and maintains comprehensive and efficient lubrication of the first and second side guide surfaces.

[0012] Optionally, the main arrangement slot and the third arrangement slot are arranged in a one-to-one correspondence, the main arrangement slot and the third arrangement slot are connected and constitute a fourth arrangement slot, and the main lubricating component and the third lubricating component are integrally formed to constitute the fourth lubricating component.

[0013] By adopting the above technical solution, the main arrangement slot and the third arrangement slot are connected to form the fourth arrangement slot, and the main lubricating component and the third lubricating component are integrally set to form the fourth lubricating component, which further simplifies the structure of the self-lubricating inner shuttle, reduces assembly difficulty and cost, and enhances the integrity and stability of the lubrication structure.

[0014] Optionally, the fourth arrangement groove is a strip-shaped through hole with a uniform cross-section; the fourth arrangement groove includes, in sequence, a first hole with a circular cross-section and a second hole with a square cross-section along the direction close to the main surface; the length of the cross-section of the second hole is less than the diameter of the cross-section of the first hole.

[0015] By adopting the above technical solution, the fourth arrangement groove is set as a strip-shaped through hole with a consistent cross-section, which facilitates the filling or embedding of the self-lubricating component. At the same time, a circular first hole and a square second hole are arranged in sequence along the direction close to the main surface, and the cross-sectional length of the second hole is smaller than the cross-sectional diameter of the first hole. This allows the self-lubricating component to be better adapted and positioned to the track structure, and improves the stability of the self-lubricating component embedding.

[0016] Optionally, the self-lubricating component is a graphite component.

[0017] By adopting the above technical solutions, the excellent self-lubricating properties of graphite can reduce frictional resistance, reduce wear, extend the service life of the self-lubricating inner shuttle during operation, and improve the smoothness and stability of operation.

[0018] Optionally, the track structure includes at least two circumferentially spaced fixing parts and an inlay part connecting two adjacent fixing parts, wherein the arrangement groove is disposed in the inlay part.

[0019] By adopting the above technical solution, the track structure is divided into a fixed part for bearing the main load and maintaining structural rigidity, and an inlay part for accommodating and fixing the self-lubricating parts. This simplifies the installation process of the self-lubricating parts and ensures the key strength and rigidity of the inner shuttle track structure. It is a design that optimizes the lubrication function and the main structure. The arrangement slot is set in the inlay part that connects adjacent fixed parts, which facilitates the reasonable arrangement of self-lubricating parts on the track structure and improves the self-lubricating performance of the self-lubricating inner shuttle. At the same time, the circumferentially spaced fixed parts can ensure the stability of the track structure.

[0020] Secondly, this application provides a rotary hook assembly, which adopts the following technical solution: A rotary shuttle assembly includes the aforementioned self-lubricating inner shuttle.

[0021] Thirdly, this application provides a sewing machine, which adopts the following technical solution: A sewing machine including the aforementioned rotary hook assembly.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. A self-lubricating inner shuttle, comprising an inner shuttle body and a track structure arranged in the inner shuttle body; a self-lubricating component is embedded in the arrangement groove of the track structure, and the self-lubricating surface of the self-lubricating component is adapted to the outer surface of the track structure, so that when the inner shuttle is working, the self-lubricating surface of the self-lubricating component directly contacts the rotating groove structure of the outer shuttle body or forms a lubricating layer in the tiny gap, thereby achieving continuous and automatic lubrication and reducing the need for additional oil injection; 2. A rotary shuttle assembly, comprising a self-lubricating inner shuttle; by setting a self-lubricating surface in the track structure of the inner shuttle body, the rotary shuttle assembly has a self-lubricating function, which reduces the frictional resistance and wear of the rotary shuttle assembly during operation, and helps to improve its operational stability and service life. 3. A sewing machine, comprising a rotary hook assembly with a self-lubricating inner shuttle; during operation, the sewing machine utilizes the self-lubricating component of the self-lubricating inner shuttle to provide a self-lubricating function, thereby reducing friction in the track structure of the rotary hook assembly, reducing operating noise, and contributing to improving the stability and service life of the sewing machine. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the self-lubricating inner shuttle in Example 1.

[0024] Figure 2 This is a schematic diagram of the installation of the inlay part on the inner shuttle body in Embodiment 1.

[0025] Figure 3 This is a schematic diagram of the self-lubricating component embedded in the arrangement groove in Example 1.

[0026] Figure 4 This is a schematic diagram of the cross-section of the groove arranged perpendicular to the length direction in Example 1.

[0027] Figure 5 This is a schematic diagram of the self-lubricating inner shuttle in Example 2.

[0028] Figure 6 This is a schematic diagram of the self-lubricating component embedded in the arrangement groove in Example 2.

[0029] Figure 7 This is a schematic diagram of the self-lubricating inner shuttle in Example 3.

[0030] Figure 8 This is a schematic diagram of the main lubricating component being embedded in the main arrangement groove in Example 3.

[0031] Figure 9 This is a schematic diagram of the self-lubricating component embedded in the arrangement groove in Example 3.

[0032] Figure 10 This is a schematic diagram of the self-lubricating inner shuttle in Example 4.

[0033] Figure 11 This is a schematic diagram of the self-lubricating component embedded in the arrangement groove in Example 4.

[0034] Figure 12 This is a schematic diagram of the self-lubricating inner shuttle in Example 5.

[0035] Figure 13 This is a schematic diagram of the installation of the self-lubricating inner shuttle and outer shuttle body in Example 6.

[0036] Figure 14 This is a schematic diagram of the bobbin component in Example 6.

[0037] Figure 15 This is a schematic diagram of the fit between the self-lubricating component and the rotating groove structure in Example 6.

[0038] Explanation of reference numerals in the attached drawings: 1. Inner shuttle body; 11. Inner shuttle base plate; 12. Inner shuttle side plate; 13. Shuttle core cavity; 14. Shuttle core shaft; 151. Fixing part; 152. Inlay part; 1521. Main guide surface; 1522. First side guide surface; 1523. Second side guide surface; 2. Arrangement groove; 21. Main arrangement groove; 22. First arrangement groove; 23. Second arrangement groove; 24. Third arrangement groove; 25. Fourth arrangement groove; 251. First hole 252. Second hole; 3. Self-lubricating component; 31. Main lubricating component; 311. Main lubricating surface; 32. First lubricating component; 321. First lubricating surface; 33. Second lubricating component; 331. Second lubricating surface; 34. Third lubricating component; 35. Fourth lubricating component; 4. Outer shuttle body; 41. Rotating inner cavity; 421. Main sliding surface; 422. First sliding surface; 423. Second sliding surface; 5. Shuttle core component; 51. Shuttle core groove. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-15 This application will be described in further detail.

[0040] Example 1 This application discloses a self-lubricating internal shuttle. (Refer to...) Figure 1 and Figure 2 The self-lubricating inner shuttle includes an inner shuttle body 1. The inner shuttle body 1 includes an inner shuttle base plate 11 and an inner shuttle side plate 12 perpendicularly connected to the inner shuttle base plate 11. The inner shuttle base plate 11 and the inner shuttle side plate 12 surround and form a shuttle core cavity 13. A shuttle core shaft 14 is provided at the bottom of the shuttle core cavity 13 on the inner shuttle base plate 11. The inner shuttle side plate 12 has a track structure on the side away from the lock core cavity. The track structure includes three circumferentially spaced fixing parts 151 and an inlay part 152 connecting two adjacent fixing parts 151. The inlay part 152 has a plurality of arrangement grooves 2 spaced along its length, and a self-lubricating element 3 is inlaid in the arrangement grooves 2. In this embodiment, the inlay part 152 is fixed to the outside of the inner shuttle side plate 12 by screws. The self-lubricating element 3 is a graphite element. It can be that the powder is directly filled into the arrangement grooves 2, or the powder is pre-shaped to fit the arrangement grooves 2 and then embedded into the arrangement grooves 2.

[0041] Reference Figure 3The outer surface of the inlay portion 152 includes a main guide surface 1521, a first side guide surface 1522, and a second side guide surface 1523. The first side guide surface 1522 and the second side guide surface 1523 are arranged opposite to each other, and the chamfered structure also falls within the scope of the first side guide surface 1522 and the second side guide surface 1523. The arrangement groove 2 includes a main arrangement groove 21 formed on the main guide surface 1521, a first arrangement groove 22 formed on the first side guide surface 1522, and a second arrangement groove 23 formed on the second side guide surface 1523. In this embodiment, the first arrangement groove 22 and the corresponding second arrangement groove 23 are arranged in a one-to-one correspondence, and the first arrangement groove 22 and the corresponding second arrangement groove 23 are connected to form a third arrangement groove 24.

[0042] Reference Figure 3 and Figure 4 The main arrangement slot 21 and the third arrangement slot 24 are arranged in a one-to-one correspondence, and the main arrangement slot 21 and the third arrangement slot 24 are connected to form the fourth arrangement slot 25. The fourth arrangement slot 25 is a strip-shaped through hole with a uniform cross-section. In this embodiment, the fourth arrangement slot 25 includes a first hole portion 251 with a circular cross-section and a second hole portion 252 with a square cross-section along the direction close to the main guide surface 1521. The cross-sectional length a of the second hole portion 252 is smaller than the cross-sectional diameter b of the first hole portion 251. The arrangement slot 2 structure, which is wider inside and narrower outside, greatly improves the fixing stability and reliability of the self-lubricating component 3 on the high-speed rotating inner shuttle.

[0043] Reference Figure 3 The self-lubricating component 3 includes a main lubricating component 31 disposed in the main arrangement groove 21, a first lubricating component 32 disposed in the first arrangement groove 22, and a second lubricating component 33 disposed in the second arrangement groove 23. In this embodiment, the first lubricating component 32 and the second lubricating component 33 are integrally disposed and constitute a third lubricating component 34. The main lubricating component 31 and the third lubricating component 34 are integrally disposed and constitute a fourth lubricating component 35, that is, the fourth lubricating component 35 includes the main lubricating component 31, the first lubricating component 32, and the second lubricating component 33. The main lubricating component 31 has a main lubricating surface 311 adapted to the main guide surface 1521. The first lubricating component 32 has a first lubricating surface 321 adapted to the first side guide surface 1522. The second lubricating component 33 has a second lubricating surface 331 adapted to the second side guide surface 1523. The self-lubricating surface is flush with the outer surface. By connecting all the arrangement slots 2 on the outer side of the inner shuttle track structure and using an integral fourth lubrication component 35, it is not easy for it to loosen, fall off or break under high-speed and heavy-load conditions. This achieves the greatest simplification of the self-lubricating system and realizes the best overall lubrication effect with the most stable and reliable structure.

[0044] The implementation principle of a self-lubricating inner shuttle in this application embodiment is as follows: a self-lubricating component 3 is embedded in the arrangement groove 2 of the track structure, and the self-lubricating surface of the self-lubricating component 3 is adapted to the outer surface of the track structure. When the inner shuttle is working, the self-lubricating surface of the self-lubricating component 3 directly contacts the rotating groove structure of the outer shuttle body 4 or forms a lubricating layer in the tiny gap, thereby achieving continuous and automatic lubrication, reducing the need for additional oil injection, helping to improve the wear resistance of the track structure and reduce its later maintenance costs.

[0045] Example 2 The self-lubricating inner shuttle in this embodiment is identical to that in Embodiment 1, except for the structure of the arrangement holes.

[0046] Reference Figure 5 and Figure 6 The arrangement slot 2 includes a main arrangement slot 21 formed on the main guide surface 1521, a first arrangement slot 22 formed on the first side guide surface 1522, and a second arrangement slot 23 formed on the second side guide surface 1523. In this embodiment, the first arrangement slot 22 and the second arrangement slot 23 are arranged in a one-to-one correspondence, and the first arrangement slot 22 and the corresponding second arrangement slot 23 are connected to form a third arrangement slot 24.

[0047] Reference Figure 5 and Figure 6 The self-lubricating component 3 includes a main lubricating component 31 disposed in the main arrangement groove 21, a first lubricating component 32 disposed in the first arrangement groove 22, and a second lubricating component 33 disposed in the second arrangement groove 23. In this embodiment, the first lubricating component 32 and the second lubricating component 33 are integrally disposed and constitute a third lubricating component 34, that is, the third lubricating component 34 includes the first lubricating component 32 and the second lubricating component 33. The main lubricating component 31 has a main lubricating surface 311 adapted to the main guide surface 1521. The first lubricating component 32 has a first lubricating surface 321 adapted to the first side guide surface 1522. The second lubricating component 33 has a second lubricating surface 331 adapted to the second side guide surface 1523.

[0048] Example 3 The self-lubricating inner shuttle in this embodiment is identical to that in Embodiment 1, except for the structure of the arrangement holes.

[0049] Reference Figure 7 and Figure 8The arrangement slot 2 includes a main arrangement slot 21 formed on the main guide surface 1521, a first arrangement slot 22 formed on the first side guide surface 1522, and a second arrangement slot 23 formed on the second side guide surface 1523. The first arrangement slot 22 and the second arrangement slot 23 are arranged in a one-to-one correspondence. The main arrangement slot 21 can be arranged in a one-to-one correspondence with the first arrangement slot 22, or it can be arranged alternately with the first arrangement slot 22. In this embodiment, the main arrangement slot 21 and the first arrangement slot 22 are arranged alternately, and correspondingly, the main arrangement slot 21 and the second arrangement slot 23 are arranged alternately.

[0050] Reference Figure 8 and Figure 9 The self-lubricating component 3 includes a main lubricating component 31 disposed in the main arrangement groove 21, a first lubricating component 32 disposed in the first arrangement groove 22, and a second lubricating component 33 disposed in the second arrangement groove 23. The main lubricating component 31 has a main lubricating surface 311 adapted to the main guide surface 1521. The first lubricating component 32 has a first lubricating surface 321 adapted to the first side guide surface 1522. The second lubricating component 33 has a second lubricating surface 331 adapted to the second side guide surface 1523.

[0051] Example 4 The self-lubricating inner shuttle in this embodiment is identical to that in Embodiment 1, except for the structure of the arrangement holes.

[0052] Reference Figure 10 and Figure 11 The arrangement groove 2 includes a main arrangement groove 21 formed on the main guide surface 1521. The self-lubricating component 3 includes a main lubricating component 31 arranged in the main arrangement groove 21. The main lubricating component 31 has a main lubricating surface 311 adapted to the main guide surface 1521.

[0053] Example 5 The self-lubricating inner shuttle in this embodiment is identical to that in Embodiment 1, except for the track structure.

[0054] Reference Figure 12 The track structure is integrated with the inner shuttle side plate 12 and has multiple arrangement slots 2 spaced apart along the length direction, and self-lubricating parts 3 are embedded in the arrangement slots 2.

[0055] Example 6 This application discloses a rotary hook assembly. (Refer to...) Figure 13 and Figure 14 The rotary shuttle assembly includes an outer shuttle body 4, a bobbin 5, and the self-lubricating inner shuttle as described in Embodiment 1. The self-lubricating inner shuttle is rotatably mounted within the outer shuttle body 4, which has a rotating inner cavity 41 for accommodating the inner shuttle body 1. The bobbin 5 is mounted at the bobbin shaft 14 of the self-lubricating inner shuttle. The bobbin 5 has a bobbin groove 51 for inserting the bobbin shaft 14.

[0056] Reference Figure 15 The outer shuttle body 4 has a circumferentially arranged rotating groove structure on the side wall of the rotating inner cavity 41 for the rotation of the track structure. The rotating groove structure has a main sliding surface 421 that mates with the main guide surface 1521, a first sliding surface 422 that mates with the first side guide surface 1522, and a second sliding surface 423 that mates with the second side guide surface 1523. Correspondingly, the main lubrication surface 311 slides relative to the main sliding surface 421, the first lubrication surface 321 slides relative to the first sliding surface 422, and the second lubrication surface 331 slides relative to the second sliding surface 423.

[0057] Example 7 Except for the self-lubricating inner shuttle, which differs from Example 4, the structure of this embodiment is identical to that of Example 4. The self-lubricating inner shuttle in this embodiment is the same as that in Example 2.

[0058] Example 8 Except for the self-lubricating inner shuttle, which differs from Example 4, the structure of this embodiment is identical to that of Example 4. The self-lubricating inner shuttle in this embodiment is the same as that in Example 3.

[0059] Example 9 Except for the self-lubricating inner shuttle, which differs from Example 4, the structure of this embodiment is identical to that of Example 4. The self-lubricating inner shuttle in this embodiment is the same as that in Example 4.

[0060] Example 10 Except for the self-lubricating inner shuttle, which differs from Example 4, the structure of this embodiment is identical to that of Example 4. The self-lubricating inner shuttle in this embodiment is the same as that in Example 5.

[0061] Example 11 This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as described in embodiment 6.

[0062] Example 12 This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as described in embodiment 7.

[0063] Example 13 This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as described in embodiment 8.

[0064] Example 14 This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as described in embodiment 9.

[0065] Example 15 This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as described in embodiment 10. 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 self-lubricating inner shuttle, comprising an inner shuttle body (1), the inner shuttle body (1) having a track structure, characterized in that, The outer surface of the track structure includes a main guide surface (1521), a first side guide surface (1522) and a second side guide surface (1523); the track structure is provided with a plurality of arrangement slots (2) spaced apart along the length direction and a self-lubricating component (3) is embedded in the arrangement slots (2); the self-lubricating component (3) has a self-lubricating surface that is adapted to the outer surface of the track structure.

2. The self-lubricating inner shuttle according to claim 1, characterized in that, The arrangement groove (2) includes a main arrangement groove (21) formed on the main guide surface (1521); the self-lubricating component (3) includes a main lubricating component (31) arranged in the main arrangement groove (21); the main lubricating component (31) has a main lubricating surface (311) adapted to the main guide surface (1521).

3. The self-lubricating inner shuttle according to claim 2, characterized in that, The arrangement groove (2) includes a first arrangement groove (22) formed on the first side guide surface (1522) and a second arrangement groove (23) formed on the second side guide surface (1523); the self-lubricating component (3) includes a first lubricating component (32) arranged in the first arrangement groove (22) and a second lubricating component (33) arranged in the second arrangement groove (23); the first lubricating component (32) has a first lubricating surface (321) adapted to the first side guide surface (1522); the second lubricating component (33) has a second lubricating surface (331) adapted to the second side guide surface (1523).

4. A self-lubricating inner shuttle according to claim 3, characterized in that, The first arrangement groove (22) and the second arrangement groove (23) are arranged in a one-to-one correspondence. The first arrangement groove (22) and the second arrangement groove (23) are connected and constitute a third arrangement groove (24). The first lubricating element (32) and the second lubricating element (33) are integrally arranged and constitute a third lubricating element (34).

5. A self-lubricating inner shuttle according to claim 4, characterized in that, The main arrangement slot (21) and the third arrangement slot (24) are arranged in a one-to-one correspondence. The main arrangement slot (21) and the third arrangement slot (24) are connected and constitute a fourth arrangement slot (25). The main lubricating component (31) and the third lubricating component (34) are integrally arranged and constitute a fourth lubricating component (35).

6. A self-lubricating inner shuttle according to claim 5, characterized in that, The fourth arrangement groove (25) is a strip-shaped through hole with a uniform cross-section; the fourth arrangement groove (25) includes a first hole (251) with a circular cross-section and a second hole (252) with a square cross-section in sequence along the direction close to the main surface (1521); the length of the cross-section of the second hole (252) is smaller than the diameter of the cross-section of the first hole (251).

7. A self-lubricating inner shuttle according to claim 1, characterized in that, The self-lubricating component (3) is a graphite component.

8. A self-lubricating inner shuttle according to claim 1, characterized in that, The track structure includes at least two circumferentially spaced fixing parts (151) and an inlay part (152) connecting two adjacent fixing parts (151), and the arrangement groove (2) is disposed in the inlay part (152).

9. A rotary shuttle assembly, characterized in that, Includes the self-lubricating inner shuttle as described in any one of claims 1-8.

10. A sewing machine, characterized in that, Includes the rotary shuttle assembly as described in claim 9.

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