Structure for keeping consistency of repeated positioning of moon circle

Abstract

The utility model discloses a moon ring repeated positioning consistency keeping structure, which comprises a moon ring and a shuttle race, a concave-convex matching structure is arranged between the moon ring and the shuttle race, the concave-convex matching structure comprises a convex block and a groove, and the convex block and the groove correspond to each other in position and are matched with each other in shape. The integral surface is repeatedly positioned through the concave-convex matching structures at the two ends, the deformation of the product can be avoided in a two-point positioning mode on the basis that the moon ring is assembled without tension, the influence of the deformation of the product on the repeated positioning of the secondary assembly of the moon ring is greatly reduced, and the production efficiency is improved. And the consistency of the matching state of rotating shuttle parts after the moon ring is repeatedly assembled is ensured, so that the product quality can be better ensured, and the qualified rate of products and the economic benefits of enterprises are improved. The utility model can ensure that the integral matching clearance of the rotating shuttle is uniform, the clearance between the shuttle frame and the shuttle race is uniform, the suspension state is stably kept, the abrasion is reduced, and the service life of the rotating shuttle is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine accessories technology, and more specifically, it relates to a structure for maintaining the consistency of the repeating positioning of the moon ring. Background Technology

[0002] Existing rotary hooks typically consist of components such as a shuttle bed, a crest ring, a guide plate, and a shuttle frame. The shuttle bed and crest ring are fixed together by three screws. During assembly, the crest ring undergoes two assembly processes. First, the crest ring is assembled onto the shuttle bed before the grooves are precision ground. After the shuttle bed grooves are ground, a second assembly is required, where the shuttle frame is inserted into the shuttle bed grooves, and then the crest ring is reassembled. Both the crest ring and the shuttle bed undergo shaping and heat treatment, resulting in dimensional changes. The crest ring's repositioning on the shuttle bed is controlled by tension and the taper guidance of the crest ring screws. This method makes it difficult to avoid product deformation, leading to inconsistent clearances between the shuttle frame and the shuttle bed after the two repositioning processes. This results in uneven overall clearances in the rotary hook assembly, causing rotational jamming or noticeable abnormal noises. Products with poor crest ring repositioning are therefore deemed unqualified and unusable. The utility model patent with announcement number CN206616345U discloses a rotary shuttle structure. However, in this utility model, the crescent ring and the shuttle bed are also fixed by screws. This also has the problem that the fit between the rotary shuttle components is inconsistent after the crescent ring is assembled and reset twice, resulting in uneven overall matching gaps. Utility Model Content

[0003] In the prior art, the ring and shuttle are fixed by screws. After the ring is assembled and reset twice, the deformation of the components will cause inconsistent mating states between the shuttle components and uneven overall mating gaps. To overcome this defect, this utility model provides a ring repeatable positioning consistency maintenance structure, which can ensure the consistency of the mating state between the shuttle components after repeated assembly of the ring, ensure uniform overall mating gaps, thereby improving the product qualification rate and economic benefits.

[0004] The technical solution of this utility model is: a structure for maintaining the consistency of the repeatable positioning of the lunar ring, including a lunar ring and a shuttle bed, with a concave-convex fitting structure between the lunar ring and the shuttle bed. The concave-convex fitting structure includes a protrusion and a groove, with the protrusion and groove corresponding in position and matching in shape. After the rotary shuttle component undergoes shaping and heat treatment deformation, the lunar ring and the shuttle bed have different degrees of deformation. In this case, if the consistency is still controlled by multiple points or the entire surface, firstly, the assembly between components is difficult, making mass production impossible; secondly, controlling by multiple points or the entire surface cannot avoid the deformation of the product itself, but will instead increase the mutual influence between the lunar ring and the shuttle bed, exacerbating local deformation. Therefore, it is impossible to guarantee that the repeatable positioning of the lunar ring can guarantee the consistency of the mating state of the rotary shuttle component, and consequently, it is impossible to guarantee the required 0.03-0.05 mm mating gap between the shuttle frame and the shuttle bed. In the prior art, the lunar ring positioning relies entirely on the inward pulling of the screw and the guiding action of the screw tapered to ensure the repeatable positioning of the lunar ring. The uneven tension caused by the quality of the screw, the deformation of the lunar ring, and the deformation of the shuttle bed seriously affects the repeatable positioning of the lunar ring. This invention uses a two-point positioning method to repeatedly position the entire surface through a concave-convex mating structure at both ends. Based on the absence of tension during the assembly of the moon ring, this method avoids the deformation of the product itself, greatly reducing the impact of product deformation on the repeated positioning of the moon ring during secondary assembly, ensuring quality, improving the product qualification rate, and enhancing the economic benefits of the enterprise.

[0005] Preferably, the protrusions include a moon ring protrusion at one end of the moon ring and a shuttle bed protrusion at one end of the shuttle bed, and the grooves include a moon ring groove at the other end of the moon ring and a shuttle bed groove at the other end of the shuttle bed. The moon ring protrusions and shuttle bed grooves mate accordingly, and the shuttle bed protrusions and moon ring grooves mate accordingly. Both the moon ring and the shuttle bed have a protrusion at one end and a groove at the other end, with different structures at both ends. This allows for quick and accurate identification of the correct installation direction when the moon ring is installed on the shuttle bed, which helps ensure consistent and repeatable positioning of the moon ring.

[0006] Preferably, the moon ring bump is integrally formed with the moon ring, and the shuttle bed bump is integrally formed with the shuttle bed. Given the limited surface area and material thickness of the moon ring and shuttle bed, forming the bumps using an integral molding method is relatively simpler and more convenient.

[0007] Preferably, the protrusions are located on the shuttle bed with a dimensional difference between the two protrusions, and the grooves are located at both ends of the moon ring with a dimensional difference between the two grooves, with the protrusions and grooves corresponding one-to-one. Alternatively, all the protrusions can be set on the shuttle bed, and all the grooves can be set on the moon ring, but the two protrusions can be machined to different sizes, and the two grooves can also be machined to different sizes. This allows the correct installation direction to be quickly and accurately identified when the moon ring is installed on the shuttle bed, which helps to ensure the consistency of the moon ring's repeated positioning.

[0008] Alternatively, the protrusions are located at both ends of the lunar ring and there is a size difference between the two protrusions, and the grooves are located on the shuttle bed and there is a size difference between the two grooves, with the protrusions and grooves corresponding to each other.

[0009] Preferably, fastening screws are also connected between the moon ring and the shuttle. The fastening screws are installed after the moon ring and the shuttle are engaged at both ends, serving only to fix the ring in place and not increasing the mutual interference between the moon ring and the shuttle.

[0010] Preferably, the fastening screw is a countersunk screw. After installation, the screw head is not exposed, which can prevent the rotary hook from interfering with surrounding parts or structures.

[0011] Preferably, the bump is a cast part.

[0012] The beneficial effects of this utility model are:

[0013] This invention ensures the consistency of the mating state between the rotary hook components after repeated assembly of the moon ring. It utilizes a two-point positioning method with concave-convex mating structures at both ends for repeated positioning of the entire surface. By avoiding product deformation during moon ring assembly without tension, and significantly reducing the impact of product deformation on the repeated positioning during moon ring reassembly, it guarantees the consistency of the mating state between the rotary hook components after repeated moon ring assembly.

[0014] Extending the service life of the rotary shuttle. This invention ensures uniform overall clearance of the rotary shuttle, and consistent clearance between the shuttle frame and the shuttle bed during rotation, maintaining a stable suspended state, reducing wear, and extending the service life of the rotary shuttle.

[0015] This invention improves product qualification rates and enhances enterprise economic benefits. It can better guarantee product quality, increase product qualification rates, and improve enterprise economic benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0017] Figure 2 This is a schematic diagram of one of the disassembled states of this utility model.

[0018] Figure 3 This is a schematic diagram showing the disassembled state from another perspective of this utility model.

[0019] Figure 4 This is a side view of the present invention.

[0020] In the diagram: 1-moon ring, 101-moon ring protrusion, 102-moon ring groove, 2-shuttle bed, 201-shuttle bed protrusion, 202-shuttle bed groove. Detailed Implementation

[0021] The following further describes the present utility model with reference to specific embodiments in conjunction with the accompanying drawings.

[0022] Embodiment 1:

[0023] As Figures 1 to 4 shown, a structure for maintaining the consistency of repeated positioning of the moon ring is provided between the moon ring 1 of the rotating shuttle and the shuttle bed 2. The moon ring 1 is formed by a casting process. The moon ring 1 is arc-shaped. The shuttle bed 2 is an incomplete rotating body. The axial section of the shuttle bed 2 is an inverted "convex" shape. The shuttle bed 2 has a bed surface and inner and outer arc-shaped walls. The inner arc-shaped wall is integrally provided at the periphery of the bed surface. The outer arc-shaped wall is fitted outside the inner arc-shaped wall. Local hollowed-out parts are provided on the bed surface and the inner arc-shaped wall. A local truncated part is provided on the outer arc-shaped wall, so that the outer arc-shaped wall does not form a complete ring. The moon ring 1 is installed in the notch formed after the local truncation of the outer arc-shaped wall. The rotating shuttle further includes a shuttle frame, and the shuttle frame is rotatably connected to the inside of the shuttle bed 2. This structure for maintaining the consistency of repeated positioning of the moon ring includes a concave-convex matching structure. The moon ring 1 and the shuttle bed 2 are axially and circumferentially positioned through this concave-convex matching structure. The concave-convex matching structure includes a convex block and a concave groove. The positions of the convex block and the concave groove correspond, and the shapes match. Both the convex block and the concave groove are rectangular. The convex block includes a moon ring convex block 101 and a shuttle bed convex block 201. The concave groove includes a moon ring concave groove 102 and a shuttle bed concave groove 202. The moon ring convex block 101 is located at one end of the moon ring 1, and the moon ring concave groove 102 is located at the other end of the moon ring 1. Similarly, the shuttle bed convex block 201 is located at one end of the shuttle bed 2, and the shuttle bed concave groove 202 is located at the other end of the shuttle bed 2. The moon ring convex block 101 is correspondingly fitted into the shuttle bed concave groove 202, and the shuttle bed convex block 201 is correspondingly fitted into the moon ring concave groove 102. The moon ring convex block 101 is located on the end edge of the moon ring 1, is integrally formed with the moon ring 1, and protrudes along the circumference of the moon ring 1. The corresponding shuttle bed concave groove 202 is located on the section formed after the local truncation of the outer arc-shaped wall. Similarly, the shuttle bed convex block 201 is located on the section formed after the local truncation of the outer arc-shaped wall, is integrally formed with the outer arc-shaped wall, and protrudes along the circumference of the outer arc-shaped wall. There are 3 equally spaced threaded holes provided on the arc-shaped wall of the shuttle bed 2, and screw through holes corresponding to the threaded holes are provided on the moon ring 1. There are 3 fastening screws connected between the moon ring 1 and the shuttle bed 2. The fastening screws pass through the screw through holes and are connected to the threaded holes. The fastening screws are countersunk screws, and a countersunk groove for burying the screw heads of the fastening screws is provided at the outer port of the screw through hole.

[0024] Different from the prior art which relies on the interference fit force of the entire surface to ensure the repeatability and consistency of the moon ring, after adopting the present utility model, when the moon ring 1 is assembled on the shuttle bed 2, the moon ring 1 is first positioned on the shuttle bed 2 through the cooperation of the convex block and the groove. During this process, there is no pulling force between the moon ring 1 and the shuttle bed 2. After the position of the moon ring 1 is determined, it is then fixed by the fastening screw. This method of first positioning the moon ring 1 on the shuttle bed 2 and then fixing it with the fastening screw can ensure the consistency of repeated disassembly and assembly of the moon ring, thereby ensuring the consistency of the size of the enclosed area of the inner arc wall of the shuttle bed 2, reducing the noise during use; and ensuring that the gap between the shuttle frame of the rotating shuttle and the inner arc wall is uniform and consistent, ensuring that the shuttle frame always remains in a suspended state during rotation, reducing wear and increasing the service life.

[0025] Embodiment 2:

[0026] A structure for maintaining the repeatability and consistency of moon ring positioning is provided between the moon ring 1 and the shuttle bed 2 of a rotating shuttle. The moon ring 1 is formed by casting, and the moon ring 1 is arc-shaped. The shuttle bed 2 is an incomplete rotating body, and the axial section of the shuttle bed 2 is an inverted "convex" shape. The shuttle bed 2 has a bed surface and inner and outer arc walls. The inner arc wall is integrally provided at the periphery of the bed surface, and the outer arc wall is fitted outside the inner arc wall. The bed surface and the inner arc wall are provided with locally hollowed-out parts, and the outer arc wall is provided with a locally truncated part, so that the outer arc wall does not form a complete ring. The moon ring 1 is installed in the notch formed after the local truncation of the outer arc wall. The rotating shuttle further includes a shuttle frame, and the shuttle frame is rotatably connected to the inside of the shuttle bed 2. This structure for maintaining the repeatability and consistency of moon ring positioning includes a concave-convex matching structure. The moon ring 1 and the shuttle bed 2 are axially and circumferentially positioned through this concave-convex matching structure. The concave-convex matching structure includes a convex block and a groove. The positions of the convex block and the groove correspond, and their shapes match. Both the convex block and the groove are rectangular. Different from Embodiment 1, in this embodiment, the convex blocks are all located at both ends of the non-closed outer arc wall of the shuttle bed 2, more specifically, on the cross-section formed after the local truncation of the outer arc wall. The convex blocks are integrally formed with the outer arc wall and protrude along the circumference of the outer arc wall, and there is a size difference between the two convex blocks, that is, one convex block is larger and the other is smaller; the grooves are all located at both ends of the moon ring 1 and there is a size difference between the two grooves, that is, one groove is larger and the other is smaller. The convex blocks and the grooves are correspondingly embedded one by one. The grooves corresponding to the convex blocks are located at both ends of the moon ring 1. There are 3 equally spaced threaded holes on the arc wall of the shuttle bed 2, and there are screw through holes corresponding to the threaded holes one by one on the moon ring 1. There are 3 fastening screws connecting the moon ring 1 and the shuttle bed 2. The fastening screws are countersunk screws, and the outer port of the screw through hole is provided with a countersunk groove for accommodating the head of the fastening screw to be buried. The rest is the same as Embodiment 1.

[0027] Different from the prior art in which the repeated consistency of the moon ring is ensured by the interference fit tension of the entire surface, after adopting the present utility model, when the moon ring 1 is assembled on the shuttle bed 2, the moon ring 1 is first positioned on the shuttle bed 2 through the cooperation of the convex block and the groove. At this time, there is no tension between the moon ring 1 and the shuttle bed 2. After the position of the moon ring 1 is positioned, it is then fixed by the fastening screw. This method of first positioning the moon ring 1 on the shuttle bed 2 and then fixing it with the fastening screw can ensure the consistency of repeated disassembly and assembly of the moon ring, thereby ensuring the consistency of the size of the enclosed area of the inner arc wall of the shuttle bed 2 and reducing the noise during use; and ensuring that the gap between the shuttle frame of the rotating shuttle and the inner arc wall is uniform, ensuring that the shuttle frame always maintains a suspended state during rotation, reducing wear and increasing the service life.

[0028] Embodiment 3:

[0029] A moon ring repeated positioning consistency maintaining structure is provided between the moon ring 1 and the shuttle bed 2 of the rotating shuttle. The moon ring 1 is formed by casting, the moon ring 1 is arc-shaped, the shuttle bed 2 is an incomplete rotating body, the axial section of the shuttle bed 2 is an inverted "convex" shape, the shuttle bed 2 has a bed surface and inner and outer arc walls, the inner arc wall is integrally provided at the periphery of the bed surface, the outer arc wall is fitted outside the inner arc wall, there are local hollowed-out parts on the bed surface and the inner arc wall, and there are local truncated parts on the outer arc wall, so that the outer arc wall does not form a complete ring, and the moon ring 1 is installed in the notch formed after the local truncation of the outer arc wall. The rotating shuttle further includes a shuttle frame, and the shuttle frame is rotatably connected to the inside of the shuttle bed 2. This moon ring repeated positioning consistency maintaining structure includes a concave-convex matching structure, and the moon ring 1 and the shuttle bed 2 are axially and circumferentially positioned through this concave-convex matching structure. The concave-convex matching structure includes a convex block and a groove, the positions of the convex block and the groove correspond, and the shapes match. The convex block and the groove are both rectangular. Different from Embodiment 1, the convex blocks are located at both ends of the moon ring 1 and are integrally formed with the moon ring 1, and protrude along the circumference of the moon ring 1. There is a size difference between the two convex blocks, that is, one of the two convex blocks is larger and the other is smaller; the grooves corresponding to the convex blocks are both located at both ends of the non-closed outer arc wall of the shuttle bed 2. More specifically, on the cross section formed after the local truncation of the outer arc wall, and there is a size difference between the two grooves, that is, one of the two grooves is larger and the other is smaller, and the convex blocks and the grooves are correspondingly fitted one by one. There are 3 equally spaced threaded holes on the arc wall of the shuttle bed 2, and there are screw perforations corresponding to the threaded holes one by one on the moon ring 1. There are 3 fastening screws connecting the moon ring 1 and the shuttle bed 2. The fastening screws are countersunk screws, and there is a countersunk groove at the outer port of the screw perforation for the head of the fastening screw to be buried in. The rest is the same as Embodiment 1.

[0030] Unlike existing technologies that rely on the tension of interference fits across the entire surface to ensure the repeatability of the moon ring, this invention, when assembling the moon ring 1 on the shuttle bed 2, first positions the moon ring 1 on the shuttle bed 2 using the engagement of the protrusion and groove. During this process, there is no tension between the moon ring 1 and the shuttle bed 2. After the moon ring 1 is positioned, it is then fixed using the fastening screws. This method of first positioning the moon ring 1 on the shuttle bed 2 and then fixing it with fastening screws ensures the consistency of repeated assembly and disassembly of the moon ring, thereby ensuring the consistency of the dimensions of the enclosed area of ​​the inner arc-shaped wall of the shuttle bed 2, reducing noise during use; and ensuring that the gap between the shuttle frame and the inner arc-shaped wall is uniform, ensuring that the shuttle frame remains in a suspended state during rotation, reducing wear, and increasing service life.

[0031] Example 4:

[0032] A structure for maintaining the consistency of the repeated positioning of the moon ring is provided between the moon ring 1 of the rotating shuttle and the shuttle bed 2. The moon ring 1 is formed by casting, and the moon ring 1 is arc-shaped. The shuttle bed 2 is an incomplete rotating body, and the axial section of the shuttle bed 2 is an inverted "convex" shape. The shuttle bed 2 has a bed surface and inner and outer arc-shaped walls. The inner arc-shaped wall is integrally provided at the periphery of the bed surface, and the outer arc-shaped wall is fitted outside the inner arc-shaped wall. Local hollow parts are provided on the bed surface and the inner arc-shaped wall, and a local truncation part is provided on the outer arc-shaped wall, so that the outer arc-shaped wall does not form a complete ring. The moon ring 1 is installed in the notch formed after the local truncation of the outer arc-shaped wall. The rotating shuttle further includes a shuttle frame, and the shuttle frame is rotatably connected to the inside of the shuttle bed 2. This structure for maintaining the consistency of the repeated positioning of the moon ring includes a convex-concave matching structure. The moon ring 1 and the shuttle bed 2 are axially and circumferentially positioned through this convex-concave matching structure. The convex-concave matching structure includes a convex block and a concave groove, and the positions of the convex block and the concave groove correspond to each other and the shapes match. Different from Embodiment 1, in this embodiment, both the convex block and the concave groove are isosceles trapezoids. The convex block includes a moon ring convex block 101 and a shuttle bed convex block 201, and the concave groove includes a moon ring concave groove 102 and a shuttle bed concave groove 202. The moon ring convex block 101 is located at one end of the moon ring 1, and the moon ring concave groove 102 is located at the other end of the moon ring 1. Similarly, the shuttle bed convex block 201 is located at one end of the shuttle bed 2, and the shuttle bed concave groove 202 is located at the other end of the shuttle bed 2. The moon ring convex block 101 is correspondingly fitted with the shuttle bed concave groove 202, and the shuttle bed convex block 201 is correspondingly fitted with the moon ring concave groove 102. The moon ring convex block 101 is located on the end edge of the moon ring 1, is integrally formed with the moon ring 1, and protrudes along the circumference of the moon ring 1. The corresponding shuttle bed concave groove 202 is located on the section formed after the local truncation of the outer arc-shaped wall; similarly, the shuttle bed convex block 201 is located on the section formed after the local truncation of the outer arc-shaped wall, is integrally formed with the outer arc-shaped wall, and protrudes along the circumference of the outer arc-shaped wall. There are 3 equally spaced threaded holes provided on the arc-shaped wall of the shuttle bed 2, and screw holes corresponding to the threaded holes one by one are provided on the moon ring 1. There are 3 fastening screws connected between the moon ring 1 and the shuttle bed 2. The fastening screws pass through the screw holes and are connected to the threaded holes. The fastening screws are countersunk screws, and a countersunk groove for accommodating the head of the fastening screw to be buried is provided at the outer port of the screw hole.

[0033] Different from the prior art method of relying on the pulling force of the interference fit of the whole surface to ensure the repeated consistency of the moon ring, after adopting the present utility model, when the moon ring 1 is assembled on the shuttle bed 2, the moon ring 1 is first positioned on the shuttle bed 2 through the cooperation of the convex block and the concave groove. At this time, there is no pulling force between the moon ring 1 and the shuttle bed 2. After the position of the moon ring 1 is positioned, it is then fixed through the fastening screws. This method of first positioning the moon ring 1 on the shuttle bed 2 and then fixing it through the fastening screws can ensure the consistency of the repeated disassembly and assembly of the moon ring, and further ensure the consistency of the size of the enclosed area of the inner arc-shaped wall of the shuttle bed 2, reducing the noise during use; and ensuring that the gap between the shuttle frame of the rotating shuttle and the inner arc-shaped wall is uniform and consistent, ensuring that the shuttle frame always maintains a suspended state when rotating, reducing wear, and increasing the service life.

Claims

1. A moon ring repositioning uniformity maintaining structure comprising a moon ring (1) and a shuttle bed (2), characterized in that, The concave-convex matching structure is arranged between the moon ring (1) and the shuttle bed (2), and comprises convex blocks and concave grooves.

2. The consistency maintaining structure for repositioning the meniscus according to claim 1, wherein The convex blocks comprise a moon ring convex block (301) at one end of the moon ring (1) and a shuttle bed convex block (302) at one end of the shuttle bed (2), and the concave grooves comprise a moon ring concave groove (401) at the other end of the moon ring (1) and a shuttle bed concave groove (402) at the other end of the shuttle bed (2), the moon ring convex block (301) is matched with the shuttle bed concave groove (402), and the shuttle bed convex block (302) is matched with the moon ring concave groove (401).

3. The consistency maintaining structure for repositioning the meniscus according to claim 2, wherein The moon ring convex block (301) is integrally formed with the moon ring (1), and the shuttle bed convex block (302) is integrally formed with the shuttle bed (2).

4. The consistency maintaining structure for repositioning the meniscus according to claim 1, wherein The convex blocks are arranged on the shuttle bed (2) and have a size difference between the two convex blocks, the concave grooves are arranged at two ends of the moon ring (1) and have a size difference between the two concave grooves, and the convex blocks and the concave grooves are matched one by one.

5. The consistency maintaining structure for repositioning the meniscus according to claim 1, wherein The convex blocks are arranged at two ends of the moon ring (1) and have a size difference between the two convex blocks, the concave grooves are arranged on the shuttle bed (2) and have a size difference between the two concave grooves, and the convex blocks and the concave grooves are matched one by one.

6. The consistency maintaining structure for repositioning the meniscus according to claim 1, wherein The moon ring (1) and the shuttle bed (2) are further connected with fastening screws.

7. The consistency maintaining structure for repositioning the meniscus according to claim 6, wherein The fastening screws are countersunk screws.

8. The meniscus repositioning uniformity maintaining structure according to any one of claims 1 to 7, characterized by, The convex blocks are castings.

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