A needle thread tension device for a sewing machine

Abstract

The application relates to an inner shuttle and a rotating shuttle assembly with a split track structure and a sewing machine, which comprises an inner shuttle body provided with a track structure; the track structure comprises at least two split track units, and at least one inlaid track segment mounted on the inner shuttle body is arranged in the split track units. The application has the effect of improving the functional adaptability of different parts of the track.

Description

Technical Field

[0001] This application relates to the field of sewing machine equipment, and in particular to an inner shuttle, a rotary shuttle assembly, and a sewing machine having a split track structure. Background Technology

[0002] In the sewing machine manufacturing industry, the inner shuttle is an important component, and its performance and structure have a crucial impact on the overall working efficiency and sewing quality of the sewing machine.

[0003] In related technologies, the inner shuttle's track structure typically employs an integral design. This design integrates the track structure with the inner shuttle body, ensuring the track's integrity and stability. However, in actual operation, the stress on different parts of the track structure is complex, leading to uneven wear. The middle section of the track, in particular, accounts for the majority of the travel distance and must withstand continuous high-speed friction and centrifugal force, thus requiring high wear resistance. While the travel distances at the beginning and end of the track are shorter, they must withstand the impact of entering and exiting the track during operation, thus requiring high impact resistance.

[0004] Regarding the aforementioned technologies, the inventors believe that it is difficult to simultaneously meet the different requirements for wear resistance and impact resistance of different parts of the track using an integral track structure. Utility Model Content

[0005] To improve the functional adaptability of different parts of the track, this application provides an inner shuttle, a rotary shuttle assembly, and a sewing machine with a split track structure.

[0006] Firstly, this application provides an inner shuttle with a split track structure, employing the following technical solution: An inner shuttle with a split track structure includes an inner shuttle body, the inner shuttle body being provided with a track structure; the track structure includes at least two split track units, the split track unit including at least one embedded track segment installed on the inner shuttle body.

[0007] By adopting the above technical solution, the track structure adopts the form of at least two split track units, which makes the track structure more flexible; the embedded track section installed in the inner shuttle body in the split track unit can improve the lubricity of the track structure.

[0008] Optionally, the split track unit may also include a fixed track section integrally formed with the inner shuttle body.

[0009] By adopting the above technical solution, a fixed track section integrated with the inner shuttle body is set in the track structure, which can increase the strength of the track structure, provide rigid support for the installation of the embedded track section, and help improve the stability and accuracy of the installation of the embedded track section.

[0010] Optionally, the split track unit has a starting end and a ending end along the incoming direction, and a docking structure is provided between adjacent split track units; the docking structure includes a first groove arranged at the ending end of the front split track unit and a first protrusion arranged at the starting end of the rear adjacent split track unit and inserted into the first groove.

[0011] By adopting the above technical solution, the docking structure formed by the first groove and the first protrusion makes the connection between adjacent split track units more stable, ensuring the continuity and stability of the track structure; when the surface line slides over the docking structure, the docking structure helps to reduce the probability of damage to the surface line and facilitates the smooth progress of the line entry process.

[0012] Optionally, the outer surface of the first protrusion is provided with a first guide surface, which is arranged inclined outward along the incoming line direction.

[0013] By adopting the above technical solution, the setting of the first guide surface further improves the fitting degree between the first protrusion and the first groove. When the wire is fed in, the first guide surface can guide the wire to pass more smoothly through the docking point of the adjacent split track unit, reducing the friction and jamming between the wire and the docking structure, thereby further improving the smoothness of the wire feeding.

[0014] Optionally, the inner shuttle body is provided with an installation arc groove for arranging the inlaid track section, and the installation arc groove has limiting end faces for the two sides of the inlaid track section to abut against each other.

[0015] By adopting the above technical solution, the installation arc groove provides space for the installation of the inlaid track section, and the limiting end face can limit the two sides of the inlaid track section, making the installation of the inlaid track section more stable and ensuring the stability and reliability of the track structure.

[0016] Optionally, the inlaid track segment has a first inlaid track segment covering the wire passage opening, the mounting arc groove corresponding to the first inlaid track segment has an arrangement segment corresponding to the wire passage opening, the arrangement segment is provided with a limiting groove along the circumferential direction, and the first inlaid track segment has a limiting protrusion embedded in the limiting arc groove.

[0017] By adopting the above technical solution, since the opening through the line will form a gap at the limiting end face on one side of the arrangement section, the inlaid track section loses the continuous support from the limiting end face, which makes the inlaid track section prone to movement at the gap. By arranging the limiting groove and the limiting protrusion at the gap, the risk of movement of the inlaid track section during operation is eliminated, effectively compensating for the structural defects caused by the interruption of the limiting end face. When the inlaid track section is placed into the arrangement slot, the limiting protrusion and the limiting groove can play a role in quick positioning, which helps to improve the assembly efficiency and accuracy of the inlaid track section.

[0018] Optionally, both ends of the inlaid track segment are locked to the inner shuttle body by mounting screws.

[0019] By adopting the above technical solution, the embedded track section can be firmly fixed on the inner shuttle body, ensuring that the embedded track section will not easily shift during use, thereby ensuring that the track structure's lubrication improvement effect is stable and reliable.

[0020] Optionally, the two ends of the inlaid track segment are fixed to the inner shuttle body by adhesive or welding.

[0021] By adopting the above technical solutions, the embedded track section can be firmly fixed to the inner shuttle body by means of adhesive bonding or welding, reducing the risk of the embedded track section loosening or shifting during operation and ensuring the stability and reliability of the track structure.

[0022] Secondly, this application provides a rotary hook assembly, which adopts the following technical solution: A rotary shuttle assembly includes the aforementioned inner shuttle with a split track structure.

[0023] Thirdly, this application provides a sewing machine, which adopts the following technical solution: A sewing machine including the aforementioned rotary hook assembly.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. An inner shuttle with a split track structure, comprising an inner shuttle body, the inner shuttle body having a track structure, the track structure comprising at least two split track units, each split track unit comprising at least one embedded track segment; the track structure adopting the form of at least two split track units makes the track structure setting more flexible; the embedded track segment installed in the inner shuttle body in the split track unit can improve the lubricity of the track structure; 2. A rotary shuttle assembly, comprising an inner shuttle with a split track structure; the rotary shuttle assembly adopts an inner shuttle with a split track structure, and the setting method of the fixed track section and the embedded track section of the track structure can improve the maintainability and wear resistance of the track structure. Different docking structures, guide surface settings, installation methods, etc. can optimize the performance of the track structure, thereby improving the overall working stability and reliability of the rotary shuttle assembly. 3. A sewing machine, comprising a rotary shuttle assembly with an inner shuttle having a split track structure; the sewing machine having an inner shuttle with a split track structure can improve the stability and reliability of the inner shuttle track during operation, thereby improving the overall sewing performance and working efficiency of the sewing machine. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the inner shuttle with a split track structure in Example 1.

[0026] Figure 2 This is a schematic cross-sectional view of the inner shuttle with a split track structure in Example 1 along the axial direction perpendicular to the central axis.

[0027] Figure 3 This is a schematic diagram of the fit between the first protrusion and the first groove in Embodiment 1.

[0028] Figure 4 This is a schematic diagram of the arrangement of the slots in Example 1.

[0029] Figure 5 This is a schematic diagram showing the distribution of the limiting protrusions on the inner surface of the inlaid track section in Embodiment 1.

[0030] Figure 6 This is a schematic diagram of the rotary hook assembly in Embodiment 2.

[0031] Figure 7 This is a schematic diagram of the bobbin sleeve in Example 2.

[0032] Figure 8 This is a schematic diagram of the cooperation between the inner shuttle body and the outer shuttle body in Example 2.

[0033] Explanation of reference numerals in the attached drawings: 1. Inner shuttle body; 11. Inner shuttle base plate; 12. Central shaft; 13. Inner shuttle side plate; 131. Mounting arc groove; 1311. Limiting end face; 1312. Arrangement section; 1313. Limiting groove; 132. Thread guide notch; 133. Needle hole; 134. Thread guide opening; 135. Mounting screw hole; 14. Shuttle core cavity; 2. Split track unit; 21. Starting end; 211. First protrusion; 2111. First guide surface; 22. Ending end; 221. First groove; 23. Inlaid track section; 231. First... 2311. Inlaid track section; 232. Limiting protrusion; 233. Second inlaid track section; 233. Mounting hole; 24. Fixed track section; 241. First fixed track section; 2411. Guide slope; 242. Second fixed track section; 243. Third fixed track section; 2431. Arc surface; 3. Mounting screw; 4. Outer shuttle body; 41. Rotating inner cavity; 42. Hook part; 421. Hook groove; 431. Main sliding surface; 432. Side sliding surface; 44. Winding channel; 45. Winding bottom cavity; 5. Shutter sleeve; 51. Shutter groove. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0035] Example 1 This application discloses an inner shuttle with a split track structure. (Refer to...) Figure 1 The inner shuttle with a split track structure includes an inner shuttle body 1. The inner shuttle body 1 includes an inner shuttle base plate 11, a central shaft 12 arranged on one side of the inner shuttle base plate 11, and an inner shuttle side plate 13 arranged circumferentially on the outer edge of the inner shuttle base plate 11. The inner shuttle base plate 11, the inner shuttle side plate 13, and the central shaft 12 are integrally formed. A shuttle core cavity 14 for arranging the shuttle core sleeve 5 is formed between the inner shuttle side plate 13 and the inner shuttle base plate 11.

[0036] Reference Figure 1 and Figure 2 A track structure is circumferentially arranged on the outer side of the inner shuttle side plate 13. The track structure includes at least two separate track units 2 arranged along the length direction. Each separate track unit 2 includes a starting end 21 and a ending end 22 along the feed direction, and a docking structure is provided between adjacent separate track units 2. The docking structure includes a first groove 221 arranged at the ending end 22 of the front separate track unit 2 and a first protrusion 211 arranged at the starting end 21 of the rear adjacent separate track unit 2 and inserted into the first groove 221. A first guide surface 2111 is provided on the outer surface of the first protrusion 211, and the first guide surface 2111 is arranged inclined outward along the feed direction. In this embodiment, the first protrusion 211 is a triangular protrusion structure, and the first groove 221 is a matching triangular groove structure.

[0037] Reference Figure 3and Figure 4 The split track unit 2 includes at least one inlaid track segment 23 installed on the inner shuttle side plate 13. The inner shuttle side plate 13 has an installation arc groove 131 for arranging the inlaid track segment 23, and the installation arc groove 131 has limiting end faces 1311 for the two sides of the inlaid track segment 23 to abut against each other. In this embodiment, the split track unit 2 includes two inlaid track segments 23. In order to improve the strength of the track structure, the split track unit 2 also includes three fixed track segments 24 integrally formed with the inner shuttle side plate 13, and the two inlaid track segments 23 are respectively arranged between two adjacent fixed track segments 24. The inlaid track segment 23 can be made of alloy materials such as CuZn24AL6, Cr12MoV, GCr15, DC53 as the main body, and self-lubricating graphite is inlaid on the outer surface of the main body. Alternatively, it can be integrally molded from functional plastics such as nylon, Teflon, ABS, and polyphenylene sulfide.

[0038] Reference Figure 1 and Figure 3 The track structure, along the thread-feeding direction, includes a first fixed track section 241, a first embedded track section 231, a second fixed track section 242, a second embedded track section 232, and a third fixed track section 243 arranged sequentially. A thread-passing notch 132 is formed between the first fixed track section 241 and the third fixed track section 243 on the inner shuttle side plate 13. A needle-passing hole 133, penetrating both the inner and outer surfaces and used for needle insertion, is provided on one side of the thread-passing notch 132 on the inner shuttle side plate 13. The first fixed track section 241 has an inlet slope 2411 at the end near the thread-passing notch 132, and the third fixed track section 243 has an arc surface 2431 at the end near the thread-passing notch 132, allowing the thread loop to smoothly slide out and tighten to form a stitch when it passes over the inner shuttle body 1.

[0039] Reference Figure 4 and Figure 5 The inner shuttle side plate 13 has a wire-passing opening 134 between the first fixed track section 241 and the second fixed track section 242. The first inlaid track section 231 is arranged to cover the wire-passing opening 134. "Covering" means that the arc length of the first inlaid track section 231 is greater than the arc length of the wire-passing opening 134, and both the starting end 21 and the ending end 22 of the first inlaid track section 231 are located outside the wire-passing opening 134. The mounting arc groove 131 corresponding to the first inlaid track section 231 has an arrangement section 1312 corresponding to the wire-passing opening 134. The arrangement section 1312 has a limiting groove 1313 arranged circumferentially, and the first inlaid track section 231 has a limiting protrusion 2311 embedded in the limiting groove 1313. In this embodiment, there are two limiting grooves 1313 arranged circumferentially at intervals, and the inlaid track section 231 has two limiting protrusions 2311 corresponding one-to-one with the two limiting grooves 1313.

[0040] Reference Figure 3 The two ends of the inlaid track section 23 can be fixed to the mounting arc groove 131 of the inner shuttle side plate 13 by means of screw installation, adhesive installation, welding installation, injection molding, etc. In this embodiment, the two ends of the inlaid track section 23 are locked to the inner shuttle side plate 13 by mounting screws 3. The inlaid track section 23 has mounting holes 233 at both ends for mounting screws 3 to be arranged, and the inner shuttle body 1 has mounting screw holes 135 at the bottom of the mounting arc groove 131 for mounting screws 3 to be locked.

[0041] The implementation principle of an inner shuttle with a split track structure in this application embodiment is as follows: a split track structure design is adopted, and the embedded track section 23, as the key wear part in contact with the outer shuttle body 4, can be manufactured using a special material with high lubricity and low friction coefficient. The inner shuttle body 1 and the fixed track section 24 can be made of materials that focus more on structural strength, ensuring the overall rigidity and impact resistance of the inner shuttle during high-speed operation. The split structure enables differentiated material selection and functional zoning, improving the wear resistance of the track structure in the most efficient way, thereby specifically improving the service life and reliability of the inner shuttle.

[0042] Example 2 This application discloses a rotary hook assembly. (Refer to...) Figure 6 and Figure 7 The rotary shuttle assembly includes an outer shuttle body 4, a shuttle core sleeve 5, and an inner shuttle with a split track structure as described in Embodiment 1. The inner shuttle with the split track structure is rotatably mounted within the outer shuttle body 4, and the outer shuttle body 4 has a rotating inner cavity 41 for arranging the inner shuttle body 1. The shuttle core sleeve 5 is arranged within the shuttle core cavity 14, and the shuttle core sleeve 5 has a shuttle core groove 51 for inserting the central shaft 12. The outer shuttle body 4 has a hook portion 42 for hooking the thread, and a hook groove 421 for arranging the thread is provided on the outer side of the hook portion 42.

[0043] Reference Figure 8 The outer surface of the track structure includes a main friction surface and two side friction surfaces. The outer shuttle body 4 has a circumferentially arranged sliding groove structure on the side wall of the rotating inner cavity 41 for the track structure to rotate. The sliding groove structure has a main sliding surface 431 that slides and engages with the main friction surface, and two side sliding surfaces 432 that engage with each of the two side friction surfaces. A winding channel 44 for the surface thread to enter is provided on the outer side of the sliding groove structure of the outer shuttle body 4. A winding bottom cavity 45, communicating with the winding channel 44 and for the surface thread to pass through, is provided at the bottom of the inner shuttle bottom plate 11 of the outer shuttle body 4.

[0044] Example 3 This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as described in Embodiment 2.

[0045] 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. An inner shuttle with a split track structure, comprising an inner shuttle body (1), wherein the inner shuttle body (1) is provided with a track structure; characterized in that, The track structure includes at least two separate track units (2), and each separate track unit (2) includes at least one inlaid track segment (23) installed on the inner shuttle body (1).

2. The inner shuttle with a split track structure according to claim 1, characterized in that, The split track unit (2) also includes a fixed track section (24) integrally formed with the inner shuttle body (1).

3. An inner shuttle with a split track structure according to claim 1 or 2, characterized in that, The split track unit (2) has a starting end (21) and a ending end (22) along the direction of entry, and a docking structure is provided between adjacent split track units (2); the docking structure includes a first groove (221) arranged on the ending end (22) of the front split track unit (2) and a first protrusion (211) arranged on the starting end (21) of the rear adjacent split track unit (2) and inserted into the first groove (221).

4. The inner shuttle with a split track structure according to claim 3, characterized in that, The outer surface of the first protrusion (211) is provided with a first guide surface (2111), which is arranged inclined outward along the incoming line direction.

5. The inner shuttle with a split track structure according to claim 1, characterized in that, The inner shuttle body (1) has an installation arc groove (131) for arranging the inlaid track section (23), and the installation arc groove (131) has a limiting end face (1311) for the two sides of the inlaid track section (23) to abut.

6. The inner shuttle with a split track structure according to claim 5, characterized in that, The inlaid track segment (23) has a first inlaid track segment (231) covering the wire passage opening (134). The mounting arc groove (131) corresponding to the first inlaid track segment (231) has an arrangement segment (1312) corresponding to the wire passage opening (134). The arrangement segment (1312) is provided with a limiting groove (1313) in the circumferential direction. The first inlaid track segment (231) has a limiting protrusion (2311) embedded in the limiting groove (1313).

7. The inner shuttle with a split track structure according to claim 1, characterized in that, Both ends of the inlaid track section (23) are locked to the inner shuttle body (1) by mounting screws (3).

8. The inner shuttle with a split track structure according to claim 1, characterized in that, The two ends of the inlaid track segment (23) are fixed to the inner shuttle body (1) by adhesive or welding.

9. A rotary shuttle assembly, characterized in that, Including the inner shuttle with a split track structure 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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