Rotating shuttle device and sewing machine

Abstract

The utility model discloses a rotating shuttle device and a sewing machine, the rotating shuttle device comprises a mounting seat and a rotating shuttle assembly, the rotating shuttle assembly comprises a rotating shaft extending along a first direction and a rotating shuttle fixed at one end of the rotating shaft, the rotating shuttle device further comprises a bearing assembly and a limiting assembly, the bearing assembly comprises a first bearing and a second bearing which are arranged in the first direction in a spaced mode and arranged on the rotating shaft in a sleeving mode. The limiting assembly comprises a first limiting piece, a second limiting piece, a third limiting piece and a fourth limiting piece which are sequentially distributed in the first direction, the first bearing is located between the first limiting piece and the second limiting piece, and the second bearing is located between the third limiting piece and the fourth limiting piece; the first limiting piece and the fourth limiting piece are fixedly arranged on the rotating shaft, and the second limiting piece and the third limiting piece are fixedly arranged on the mounting seat; or, the first limiting piece and the fourth limiting piece are fixedly arranged on the mounting base, the second limiting piece and the third limiting piece are fixedly arranged on the rotating shaft, and the limiting assembly is simple in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a rotary hook device and a sewing machine. Background Art

[0002] The rotary hook device is an essential component of a sewing machine, which includes a rotary hook, a rotary hook shaft and a shuttle rack. The rotary hook is fixed on the rotary hook shaft, and the rotary hook shaft is inserted into a bearing, so that the rotary hook shaft can rotate relative to the shuttle rack. As the operation time of the sewing machine increases or faults such as thread jamming occur, the bearing and the vertical shaft will displace relative to the shuttle rack, which will not only affect the normal operation of the rotary hook, but also affect the operation of other mechanisms of the sewing machine. Some sewing machines are provided with a limiting mechanism to limit the movement of the vertical shaft and the bearing, but most of the limiting mechanisms are complex in structure, cumbersome in installation operation, and will increase the production cost of the sewing machine. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a new rotary hook device.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a rotary hook device, which includes a mounting seat and a rotary hook assembly rotatably arranged on the mounting seat. The rotary hook assembly includes a rotating shaft extending along a first direction and a rotary hook fixed at one end of the rotating shaft. The rotary hook device further includes:

[0005] A bearing assembly, including a first bearing and a second bearing spaced along the first direction on the mounting seat, and the first bearing and the second bearing are respectively sleeved on the rotating shaft;

[0006] A limiting assembly, the limiting assembly includes a first limiting member, a second limiting member, a third limiting member and a fourth limiting member distributed in sequence along the first direction. Among them, the first bearing is located between the first limiting member and the second limiting member, and the second bearing is located between the third limiting member and the fourth limiting member;

[0007] The first limiting member and the fourth limiting member are fixed on the rotating shaft, and the second limiting member and the third limiting member are fixed on the mounting seat; or, the first limiting member and the fourth limiting member are fixed on the mounting seat, and the second limiting member and the third limiting member are fixed on the rotating shaft.

[0008] In some embodiments, the first limiting member and the fourth limiting member are fixed on the rotating shaft, a first gear is fixed on the rotating shaft, the first gear and the rotary hook are located at different ends in the length direction of the rotating shaft, and the first gear constitutes the fourth limiting member; the rotary hook device further includes a driving mechanism for cooperating with the first gear and driving the rotating shaft to rotate.

[0009] In some embodiments, an annular clamping groove is provided on the rotating shaft, and the first limiting member is a first snap ring fixed in the clamping groove. Along the first direction, the first snap ring is located between the rotating shuttle and the first bearing.

[0010] In some embodiments, the driving mechanism includes a driving shaft and a driving member for driving the driving shaft to rotate about its own center line. The driving shaft extends along a second direction, and the second direction is perpendicular to the first direction. A second gear is fixedly provided on the driving shaft, and the first gear meshes with the second gear.

[0011] In some embodiments, the first gear is fixed to the rotating shaft by a first bolt.

[0012] In some embodiments, an installation cavity extending along the first direction is provided on the mounting seat. The rotating shaft is inserted into the installation cavity, and the first bearing and the second bearing are arranged in the installation cavity. Along the first direction, two annular grooves are spaced apart on the cavity wall of the installation cavity. The two annular grooves are located between the first bearing and the second bearing, and second snap rings are respectively fixed in the two annular grooves. The two second snap rings respectively constitute the second limiting member and the third limiting member.

[0013] In some embodiments, along the first direction, the rotating shuttle is located on one side of the mounting seat, and a gap is left between the rotating shuttle and the mounting seat. The rotating shuttle device includes a protective cover fixedly provided on the mounting seat. The protective cover has a shielding portion that surrounds the circumferential outer side of the rotating shuttle, and the shielding portion shields the gap between the rotating shuttle and the mounting seat.

[0014] In some embodiments, the rotating shuttle device includes a thread cutting mechanism. The thread cutting mechanism includes a fixed knife assembly and a moving knife assembly. The fixed knife assembly includes a fixed knife seat provided on the mounting seat and a fixed knife fixed to the fixed knife seat. One of the fixed knife seat and the fixed knife is provided with a first positioning pin, and the other is provided with a first positioning hole. The first positioning pin is inserted into the first positioning hole. The moving knife assembly includes a moving knife seat rotatably provided on the mounting seat about a rotation center line and a moving knife fixed to the moving knife seat. The extending direction of the rotation center line is parallel to the first direction. One of the moving knife seat and the moving knife is provided with a second positioning pin, and the other is provided with a second positioning hole. The second positioning pin is inserted into the second positioning hole.

[0015] In some embodiments, the first positioning pin is arranged on the fixed knife seat, the first positioning hole is arranged on the fixed knife, the fixed knife assembly further includes a clamping member fixed on the fixed knife seat, a third positioning hole is provided on the clamping member, and the first positioning pin is inserted into the first positioning hole and simultaneously inserted into the third positioning hole.

[0016] In some embodiments, the second positioning pin is arranged on the moving knife seat, and the second positioning hole is arranged on the moving knife.

[0017] In some embodiments, the fixed knife seat is adjustably arranged on the mounting seat, a waist-shaped hole is provided on the fixed knife seat, the fixed knife assembly includes a second bolt, and the second bolt passes through the waist-shaped hole and is threadedly connected to the mounting seat.

[0018] Another object of the present invention is to provide a sewing machine.

[0019] To achieve the above object, the technical solution adopted by the present invention is: a sewing machine, including the above-mentioned rotating hook device.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: in the rotating hook device of the present invention, its limiting component includes four limiting members arranged in sequence along the first direction. Through the mutual cooperation between the limiting members, as well as between the limiting members and the bearing assembly, the rotating shaft, and the mounting seat, the up-and-down limiting of the first bearing, the second bearing, and the rotating shaft is realized. Specifically, the limiting member arranged on the mounting seat can limit the first bearing and the second bearing in a single direction. Through the cooperation between the limiting member arranged on the rotating shaft and the bearing assembly, not only the displacement of the rotating shaft along the first direction is restricted, but also it acts on the bearing assembly in the opposite direction, restricting the displacement of the bearing assembly. Under the combined action of the first limiting member and the second limiting member, the displacement of the first bearing is restricted. Under the combined action of the third limiting member and the fourth limiting member, the displacement of the second bearing is restricted. The limiting component has a simple structure, is convenient to install, and has a low production cost. Description of the Drawings

[0021] Attached Figure 1 is a three-dimensional structural schematic diagram of the rotating hook device of a specific embodiment of the present invention;

[0022] Attached Figure 2 is for Figure 1 the side view;

[0023] Attached Figure 3 is for Figure 2 the sectional view taken along the A-A direction in Attached

[0024] Attached Figure 4 is for Figure 3 the enlarged schematic diagram at B in Attached

[0025] Attached Figure 5 Is the partial structural decomposition diagram of the attached Figure 1 ;

[0026] Attached Figure 6 Is the partial decomposition diagram after removing the rotating shuttle Figure 1 ;

[0027] Attached Figure 7 Is the three-dimensional structural diagram of the rotating shuttle device of another embodiment

[0028] Attached Figure 8 Is the attached Figure 7 Partial structural decomposition diagram of;

[0029] Attached Figure 9 Is the attached Figure 7 Top view, where the moving knife is in the first position

[0030] Attached Figure 10 Is the attached Figure 9 Schematic diagram when the moving knife is in the second position

[0031] Attached Figure 11 Is the three-dimensional structural diagram of the sewing machine of a specific embodiment of the present utility model

[0032] Attached Figure 12 Is the attached Figure 11 Enlarged schematic diagram at C in;

[0033] Wherein: 1, mounting base; 11, mounting cavity; 12, accommodating cavity; 2, rotating shaft; 21, first gear; 22, first bolt; 3, rotating shuttle; 41, first bearing; 42, second bearing; 51, first limiting member; 52, second limiting member; 53, third limiting member; 54, fourth limiting member;

[0034] 6, fixed knife assembly; 61, fixed knife seat; 611, positioning pin; 612, waist-shaped hole; 62, fixed knife; 621, first positioning hole; 63, clamping member; 631, third positioning hole; 64, second bolt;

[0035] 7, moving knife assembly; 71, moving knife seat; 711, second positioning pin; 72, moving knife; 721, second positioning hole; 722, first end; 723, second end; 73, gasket;

[0036] 8, protective cover; 81, main body part; 82, shielding part;

[0037] 91, drive shaft; 92, second gear; 100, rotating shuttle device. Specific embodiments

[0038] The technical solution of the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the present utility model are more easily understood by those skilled in the art. Obviously, the described embodiments of the present application are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative work belong to the scope of protection of the present application.

[0039] Refer to Figure 11 、 Figure 12 A sewing machine shown, which includes a rotating hook device 100. Refer to Figure 1 、 Figure 2 As shown, the rotating hook device 100 includes a mounting base 1 and a rotating hook assembly rotatably disposed on the mounting base 1. The rotating hook assembly includes a rotating shaft 2 extending in a first direction and a rotating hook 3 fixed to one end of the rotating shaft 2. The rotating hook device 100 further includes a bearing assembly, and the bearing assembly includes a first bearing 41 and a second bearing 42 spaced apart in the first direction on the mounting base 1. The first bearing 41 and the second bearing 42 are respectively sleeved on the rotating shaft 2. Through the first bearing 41 and the second bearing 42, the rotating shaft 2 can rotate relative to the mounting base 1 around its own axis, and the setting of two bearings makes the rotating shaft 2 more stable when rotating.

[0040] The rotating hook device 100 further includes a limiting assembly. The limiting assembly includes a first limiting member 51, a second limiting member 52, a third limiting member 53, and a fourth limiting member 54 sequentially distributed in the first direction. Among them, the first bearing 41 is located between the first limiting member 51 and the second limiting member 52, and the second bearing 42 is located between the third limiting member 53 and the fourth limiting member 54. In this embodiment, the first limiting member 51 and the fourth limiting member 54 are fixed on the rotating shaft 2, and the second limiting member 52 and the third limiting member 53 are fixed on the mounting base 1. The first limiting member 51 and the second limiting member 52 limit the displacement of the first bearing 41 in the first direction, and the third limiting member 53 and the fourth limiting member 54 limit the displacement of the second bearing 42 in the first direction. At the same time, the first limiting member 51 and the fourth limiting member 54 limit the relative displacement between the rotating shaft 2 and the bearing assembly, thereby limiting the relative displacement between the rotating shaft 2 and the mounting base 1 in the first direction. Only four limiting members can realize the limitation of the first bearing 41, the second bearing 42, and the rotating shaft 2, prevent the first bearing 41, the second bearing 42, and the rotating shaft 2 from displacing during the operation of the sewing machine, ensure the stability of the rotating hook device 100 and the operation of the sewing machine, and at the same time simplify the structure of the rotating hook device 100 and reduce the production cost of the sewing machine.

[0041] In other embodiments, the first limiting member 51 and the fourth limiting member 54 are fixedly arranged on the mounting base 1, and the second limiting member 52 and the third limiting member 53 are fixedly arranged on the rotating shaft 2. The limiting assembly can also limit the first bearing 41, the second bearing 42 and the rotating shaft 2.

[0042] In this embodiment, the mounting base 1 is provided with a mounting cavity 11 extending in the first direction, the rotating shaft 2 is inserted into the mounting cavity 11, and the first bearing 41 and the second bearing 42 are arranged in the mounting cavity 11.

[0043] In this embodiment, the rotating shaft 2 is provided with an annular clamping groove, and the first limiting member 51 is a first circlip fixed in the clamping groove. Refer to Figure 3 、 Figure 6 As shown, the first circlip is fixedly arranged on the side of the rotating shaft 2 close to the rotating shuttle 3. In the first direction, the first circlip is located between the rotating shuttle 3 and the first bearing 41. In this embodiment, in the first direction, two annular grooves are spacedly arranged on the cavity wall of the mounting cavity 11, and the two annular grooves are located between the first bearing 41 and the second bearing 42. Second circlips are respectively fixed in the two annular grooves, and the two second circlips respectively constitute the second limiting member 52 and the third limiting member 53. Specifically, the second circlip close to the first bearing 41 is the second limiting member 52, and the second circlip close to the second bearing 42 is the third limiting member 53. In this embodiment, a first gear 21 is fixedly arranged on the rotating shaft 2, and the first gear 21 and the rotating shuttle 3 are respectively arranged at opposite ends in the length direction of the rotating shaft 2. The first gear 21 constitutes the fourth limiting member 54. The rotating shuttle device further includes a driving mechanism, and the first gear 21 is used to cooperate with the driving mechanism and drive the rotating shaft 2 to rotate.

[0044] In this embodiment, the rotating shaft 2 extends in the up and down direction, and the first bearing 41 and the second bearing 42 are spacedly arranged in the up and down direction. Among them, the first bearing 41 is located above the second bearing 42, and the first limiting member 51, the second limiting member 52, the third limiting member 53 and the fourth limiting member 54 are distributed in sequence from top to bottom. The second limiting member 52 is located below the first bearing 41 and can limit the downward displacement of the first bearing 41. The downward displacement of the rotating shaft 2 is limited by the cooperation between the first limiting member 51 and the first bearing 41. The third limiting member 53 is located above the second bearing 42 and can limit the upward displacement of the second bearing 42. By means of the fourth limiting member 54 fixedly arranged on the rotating shaft 2, the downward movement of the second bearing 42 can be blocked, thereby realizing the limitation of the first bearing 41, the second bearing 42 and the rotating shaft 2.

[0045] In this embodiment, the driving mechanism includes a driving shaft 91 and a driving member for driving the driving shaft to rotate about its own central axis. The driving shaft 91 extends in the second direction, which is perpendicular to the first direction. A second gear 92 is fixedly provided on the driving shaft 91, and the first gear 21 meshes with the second gear 92. Specifically, both the first gear 21 and the second gear 92 are conical. In this embodiment, the driving shaft 91 extends in the horizontal direction, and the driving member can also be arranged horizontally relative to the mounting base 1, so that the size of the rotating hook device in the vertical direction can be greatly reduced, thereby reducing the size of the sewing machine in the vertical direction.

[0046] In this embodiment, the rotating hook 3 is arranged on one side of the mounting base 1. The mounting base 1 is provided with a first opening and a second opening communicating with the mounting cavity 11. Along the first direction, the first opening and the second opening are respectively arranged on different sides of the mounting cavity 11. Among them, the first opening communicates the mounting cavity 11 with the outside of the mounting base 1, and part of the rotating shaft 2 extends out from the first opening, and the rotating hook 3 is installed at the first opening. The mounting base 1 is further provided with a receiving cavity 12, and the second opening communicates the mounting cavity 11 with the receiving cavity 12. The first gear 21 extends into the receiving cavity 12 from the second opening, and the driving shaft and the second gear are both located in the receiving cavity 12. In this embodiment, the first opening is located in the upper part of the mounting base 1, the rotating hook 3 is installed in the upper part of the mounting base 1, the receiving cavity 12 is located below the mounting cavity 11, and the second opening is located in the lower part of the mounting cavity 11.

[0047] In this embodiment, the first gear 21 is fixed to the rotating shaft 2 by a first bolt 22. When assembling the rotating hook device 100, first fix the first snap ring on the rotating shaft 2, fix two second snap rings in the mounting cavity 11, and then press the first bearing 41 and the second bearing 42 into the mounting cavity 11. Specifically, the first bearing 41 is pressed into the mounting cavity 11 from the first opening, and the second bearing 42 is pressed into the mounting cavity 11 from the second opening. After the bearing assembly is installed, insert the rotating shaft 2 into the mounting cavity 11 from the first opening. During the insertion process, the rotating shaft 2 is sequentially inserted into the first bearing 41 and the second bearing 42, and finally fix the first gear 21 to the end of the rotating shaft 2 by the first bolt 22. The rotating hook 3 can be directly fixed to the rotating shaft 2 after fixing the first snap ring, or the rotating hook 3 can be fixed to the rotating shaft 2 after inserting the rotating shaft 2 into the mounting cavity 11.

[0048] See Figure 3 As shown, along the first direction, there is a gap between the rotating hook 3 and the mounting base 1. During the operation of the sewing machine, a large number of thread ends will be generated. When the thread ends enter the gap between the rotating hook 3 and the mounting base 1, they are very likely to be wound around the rotating shaft 2 or the rotating hook 3, thereby causing a thread jamming fault. In this embodiment, see Figures 3 to 5As shown, a protective cover 8 is provided between the rotating shuttle 3 and the mounting seat 1, and the protective cover 8 is fixed to the mounting seat 1. Specifically, the protective cover 8 has a main body portion 81 and a shielding portion 82 fixed together. In this embodiment, the main body portion 81 and the shielding portion 82 are integrally formed. Along the first direction, the main body portion 81 is fixed to the mounting seat 1 and is located between the mounting seat 1 and the rotating shuttle 3. The main body portion 81 extends radially outward along the rotation axis 2 and extends out of the gap between the mounting seat 1 and the rotating shuttle 3. Along the first direction, the main body portion 81 is spaced from the rotating shuttle 3, so as not to affect the normal operation of the rotating shuttle 3. The shielding portion 82 extends along the first direction from the outside of the main body portion 81. The shielding portion 82 is annular and surrounds the circumferential outside of the rotating shuttle 3, and the shielding portion 82 shields the gap between the mounting seat 1 and the rotating shuttle 3, so that the thread end can be prevented from entering the gap, thereby avoiding failures.

[0049] In some embodiments, as shown in Figure 7 、 Figure 8 the rotating shuttle device 100 further includes a thread cutting mechanism. The thread cutting mechanism includes a fixed knife assembly 6 and a moving knife assembly 7. The fixed knife assembly 6 includes a fixed knife seat 61 provided on the mounting seat 1 and a fixed knife 62 fixed to the fixed knife seat 61. One of the fixed knife seat 61 and the fixed knife 62 is provided with a first positioning pin 611, and the other is provided with a first positioning hole 621. The first positioning pin 611 is inserted into the first positioning hole 621. The moving knife assembly 7 includes a moving knife seat 71 rotatably provided on the mounting seat 1 around a rotation center line X1, and a moving knife 72 fixed to the moving knife seat 71. The extending direction of the rotation center line X1 is parallel to the first direction. One of the moving knife seat 71 and the moving knife 72 is provided with a second positioning pin 711, and the other is provided with a second positioning hole 721. The second positioning pin 711 is inserted into the second positioning hole 721. Through the cooperation of the first positioning pin 611 and the first positioning hole 621, the quick positioning and quick installation of the fixed knife 62 and the fixed knife seat 61 can be realized. Through the cooperation of the second positioning pin 711 and the second positioning hole 721, the quick positioning and quick installation of the moving knife 72 and the moving knife seat 71 can be realized.

[0050] In this embodiment, the first positioning pin 611 is provided on the fixed knife seat 61, and the first positioning hole 621 is provided on the fixed knife 62. In this embodiment, the fixed knife assembly 6 further includes a clamping member 63 fixed to the fixed knife seat 61 for cooperating with the moving knife 72 and clamping the bobbin thread. The clamping member 63 is provided with a third positioning hole 631. The first positioning pin 611 is inserted into the first positioning hole 621 and simultaneously inserted into the third positioning hole 631. Through the cooperation between the third positioning hole 631 and the first positioning pin 611, the quick positioning and quick installation of the clamping member 63 are realized.

[0051] In this embodiment, the second positioning pin 711 is arranged on the moving knife holder 71, and the second positioning hole 721 is arranged on the moving knife 72. The moving knife 72 cannot move relative to the moving knife holder 71, and the position of the moving knife 72 is unique, ensuring that the moving knife 72 can work stably and normally. In this embodiment, the fixed knife holder 61 is arranged with an adjustable position, and the relative position between the fixed knife 62 and the moving knife 72 is adjusted by adjusting the fixed knife holder 61. Specifically, a waist-shaped hole 612 is provided on the fixed knife holder 61, and the fixed knife assembly 6 includes a second bolt 64. The second bolt 64 passes through the waist-shaped hole 612 and is threadedly connected to the mounting seat 1. The position of the fixed knife holder 61 on the mounting seat 1 is adjusted by adjusting the position of the second bolt 64 in the waist-shaped hole 612, so as to realize the position adjustment between the fixed knife 62 and the moving knife 72.

[0052] In this embodiment, referring to Figure 7 As shown, a gasket 73 for adjusting the height of the moving knife 72 is provided between the moving knife 72 and the moving knife holder 71. A plurality of gaskets 73 are pre-stored above the moving knife 72. When the moving knife 72 is fixed to the moving knife holder 71 by screws, the pre-stored gaskets 73 are also fixed relative to the moving knife 72. Thus, when it is necessary to adjust the height of the moving knife 72, the gasket 73 pre-stored above the moving knife 72 can be directly used.

[0053] In this embodiment, two kinds of symbol scales are provided on the moving knife 72, including a circle symbol and an arrow symbol. The two symbol scales are arranged at the cutting head of the moving knife 72. The cutting head of the moving knife 72 has a first end 722 and a second end 723 which are respectively arranged at two ends different from its own length direction. Among them, the first end 722 is used to cooperate with the cutting edge of the fixed knife 62 to realize cutting. Along the length extension direction of the moving knife 72, the circle symbol is closer to the first end 722. Referring to Figure 9 As shown, when adjusting the fixed knife holder 61, the cutting edge of the fixed knife 62, that is, the free end of the fixed knife 62, is aligned with the arrow symbol, and then the second bolt 64 can be tightened. Referring to Figure 10 As shown, when the moving knife 72 performs a cutting operation, the cutting edge of the fixed knife 62 is aligned with the circle symbol to realize cutting. The circle symbol at this time represents the stop position of the moving knife 72. Thus, when ensuring that the cutting work is normally performed, the force required for the moving knife 72 to move away from the fixed knife 62 is small, so as to avoid the situation that after long-term work, the moving knife 72 cannot be driven to rotate, resulting in the inability to cut the thread.

[0054] In summary, for the bobbin case device 100 of this embodiment, the upward displacement of the first bearing 41 and the downward displacement of the second bearing 42 can be restricted by the second limiting member 52 and the third limiting member 53 provided on the mounting base 1. By providing the first limiting member 51 and the fourth limiting member 54 on the rotating shaft 2, while restricting the displacement of the rotating shaft 2 in the up and down directions, the restriction on the downward displacement of the first bearing 41 and the upward displacement of the second bearing 42 is also compensated. At the same time, the fourth limiting member 54 is a gear for cooperating with the drive shaft. Thus, only by separately providing the first limiting member 51, the second limiting member 52, and the third limiting member 53, the limiting of the first bearing 41, the second bearing 42, and the rotating shaft 2 in the first direction can be achieved, improving the stability of the bobbin case device 100. Moreover, the limiting component has a simple structure and is convenient to install, which can reduce the cost of the sewing machine.

[0055] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and it is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A rotary shuttle device, comprising a mounting base and a rotary shuttle assembly rotatably arranged on the mounting base, the rotary shuttle assembly including a rotating shaft extending in a first direction and a rotary shuttle fixed to one end of the rotating shaft, characterized in that: The rotating shuttle device further includes: A bearing assembly, including a first bearing and a second bearing spaced along the first direction on the mounting base, with the first bearing and the second bearing respectively sleeved on the rotating shaft; A limiting assembly, which includes a first limiting member, a second limiting member, a third limiting member, and a fourth limiting member distributed in sequence along the first direction. Among them, the first bearing is located between the first limiting member and the second limiting member, and the second bearing is located between the third limiting member and the fourth limiting member; The first limiting member and the fourth limiting member are fixed on the rotating shaft, and the second limiting member and the third limiting member are fixed on the mounting base; or, the first limiting member and the fourth limiting member are fixed on the mounting base, and the second limiting member and the third limiting member are fixed on the rotating shaft.

2. The rotating shuttle device according to claim 1, wherein: The first limiting member and the fourth limiting member are fixed on the rotating shaft, and a first gear is fixed on the rotating shaft. The first gear and the rotating shuttle are located at opposite ends in the length direction of the rotating shaft, and the first gear constitutes the fourth limiting member; the rotating shuttle device further includes a driving mechanism for cooperating with the first gear and driving the rotating shaft to rotate.

3. The rotating shuttle device according to claim 2, characterized in that: A circular groove is provided on the rotating shaft, and the first limiting member is a first snap ring fixed in the circular groove. Along the first direction, the first snap ring is located between the rotating shuttle and the first bearing.

4. The rotating shuttle device according to claim 2, characterized in that: The driving mechanism includes a driving shaft and a driving member for driving the driving shaft to rotate around its own center line. The driving shaft extends along a second direction, and the second direction is perpendicular to the first direction. A second gear is fixed on the driving shaft, and the first gear and the second gear are meshed with each other; And / or, the first gear is fixed on the rotating shaft by a first bolt.

5. The rotating shuttle device according to claim 1, characterized in that: The mounting base is provided with a mounting cavity extending along the first direction, and the rotating shaft is inserted into the mounting cavity. The first bearing and the second bearing are arranged in the mounting cavity; Along the first direction, two circular grooves are spaced on the cavity wall of the mounting cavity. The two circular grooves are located between the first bearing and the second bearing, and second snap rings are respectively fixed in the two circular grooves, and the two second snap rings respectively constitute the second limiting member and the third limiting member.

6. The rotating shuttle device according to claim 1, wherein: Along the first direction, the rotating shuttle is located on one side of the mounting base, and there is a gap between the rotating shuttle and the mounting base. The rotating shuttle device includes a protective cover, which is fixed on the mounting base. The protective cover has a shielding portion that surrounds the circumferential outside of the rotating shuttle, and the shielding portion shields the gap between the rotating shuttle and the mounting base.

7. The rotating shuttle device according to claim 1, wherein: The rotating shuttle device includes a thread cutting mechanism, which includes a fixed knife assembly and a moving knife assembly. The fixed knife assembly includes a fixed knife seat provided on the mounting base and a fixed knife fixed on the fixed knife seat. One of the fixed knife seat and the fixed knife is provided with a first positioning pin, and the other is provided with a first positioning hole, and the first positioning pin is inserted into the first positioning hole; The moving knife assembly includes a moving knife seat rotatably disposed on the mounting base about a rotation center line, and a moving knife fixed on the moving knife seat. The extending direction of the rotation center line is parallel to the first direction. A second positioning pin is provided on one of the moving knife seat and the moving knife, and a second positioning hole is provided on the other. The second positioning pin is inserted into the second positioning hole.

8. The rotating shuttle device according to claim 7, wherein: The first positioning pin is provided on the fixed knife seat, and the first positioning hole is provided on the fixed knife. The fixed knife assembly further includes a clamping member fixed on the fixed knife seat. A third positioning hole is provided on the clamping member. The first positioning pin is inserted into the first positioning hole and simultaneously inserted into the third positioning hole. And / or, the second positioning pin is provided on the moving knife seat, and the second positioning hole is provided on the moving knife.

9. The rotating hook device according to claim 7, characterized in that: The fixed knife seat is disposed on the mounting base in a position-adjustable manner. A waist-shaped hole is provided on the fixed knife seat. The fixed knife assembly includes a second bolt, and the second bolt passes through the waist-shaped hole and is threadedly connected to the mounting base.

10. A sewing machine, characterized in that: It includes a rotating shuttle device according to any one of claims 1 to 9.

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