Shuttle peg and mounting structure thereof

Abstract

The utility model relates to a shuttle peg which comprises a plastic base body and magnetic powder evenly mixed in the plastic base body, and the shuttle peg is an integrally-formed piece. The plastic base body comprises a winding shaft part, a first outer flange part arranged at one end of the winding shaft part and a second outer flange part arranged at the other end of the winding shaft part, and the first outer flange part and the second outer flange part extend outwards in the radial direction of the winding shaft part. The utility model further provides a shuttle peg mounting structure. The magnetic powder is uniformly mixed in the shuttle peg made of plastic, so that the shuttle peg becomes a magnet on the whole, the characteristics of the plastic shuttle peg are reserved, the shuttle peg and the shuttle shell are magnetically attracted with each other, it can be guaranteed that the shuttle peg is subjected to sufficient friction force without a spring piece, and necessary damping for preventing the shuttle peg from inertia idling is provided for the shuttle peg. The anti-skidding patterns and the anti-skidding protrusions are arranged on the shuttle peg, so that the possibility that sewing threads slip relative to the plastic shuttle peg can be reduced, and the possibility that the shuttle peg slips relative to a shaft of the winder can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a bobbin and its mounting structure. Background Technology

[0002] Some bobbins are made of plastic. The bobbin case used with plastic bobbins requires a spring plate acting on the plastic bobbin to increase the frictional force acting on it. This friction provides the necessary damping to prevent the plastic bobbin from spinning freely due to inertia. The kit consisting of a plastic bobbin, spring plate, and bobbin case may present the following technical problems in practical use:

[0003] As working time goes on, the spring sheet is prone to fatigue deformation and wear, which may affect the normal service life of the spring sheet and may require replacement of the spring sheet and the shuttle case.

[0004] During the process of winding the sewing thread onto the plastic bobbin, the sewing thread may slip relative to the plastic bobbin.

[0005] During the winding process of the plastic bobbin, the plastic bobbin may slip relative to the shaft of the winder. Utility Model Content

[0006] The purpose of this invention is to provide a bobbin and its mounting structure to alleviate or eliminate at least one of the aforementioned technical problems.

[0007] The present invention discloses a bobbin, the bobbin comprising a plastic matrix and magnetic powder uniformly mixed in the plastic matrix, the bobbin being an integrally molded part; the plastic matrix comprising a winding shaft portion, a first outer flange portion disposed at one end of the winding shaft portion and a second outer flange portion disposed at the other end of the winding shaft portion, the first outer flange portion and the second outer flange portion both extending radially outward along the winding shaft portion.

[0008] Optionally, the two ends of the bobbin along the axial direction are S magnetic poles and N magnetic poles, respectively.

[0009] Optionally, the outer peripheral surface of the winding shaft is provided with anti-slip texture.

[0010] Optionally, the anti-slip texture includes strip-shaped grooves whose length extends axially along the winding shaft portion.

[0011] Optionally, the winding shaft portion is provided with a shaft hole that extends through the winding shaft portion along the axial direction of the winding shaft portion, and an anti-slip protrusion is provided on the inner circumferential surface of the shaft hole.

[0012] Optionally, the anti-slip protrusion is a rib that extends axially along the shaft hole.

[0013] This utility model also proposes a bobbin mounting structure, including a bobbin case and a bobbin as described in any of the above. The bobbin case includes a bottom wall and a peripheral wall connected to the bottom wall. The bobbin is installed in the space enclosed by the bottom wall and the peripheral wall. One end face of the bobbin in the axial direction contacts the bottom wall, and the bobbin and the bottom wall are magnetically attracted to each other.

[0014] Optionally, the shuttle housing is a metal part suitable for magnetic attraction with the shuttle core.

[0015] This invention uniformly incorporates magnetic powder into a plastic bobbin, making the bobbin itself a magnet. This retains the characteristics of a plastic bobbin while utilizing the magnetic attraction between the bobbin and the bobbin case to ensure sufficient friction for the bobbin without the need for a spring, providing the necessary damping to prevent the bobbin from spinning freely due to inertia. Furthermore, by incorporating anti-slip textures and protrusions on the bobbin, this invention reduces the likelihood of the sewing thread slipping relative to the plastic bobbin and the bobbin slipping relative to the winder shaft. This invention is characterized by its simple structure, ease of implementation, and small number of parts. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the bobbin structure described in some embodiments;

[0017] Figure 2 This is a magnetic field distribution diagram of the shuttle core described in some embodiments;

[0018] Figure 3 This is a top view of the bobbin described in some embodiments;

[0019] Figure 4 for Figure 3 AA section view in the middle;

[0020] Figure 5 for Figure 4 BB section view in the middle;

[0021] Figure 6 This is a cross-sectional view of the bobbin mounting structure described in some embodiments;

[0022] Figure 7 This is a schematic diagram of the shuttle shell structure described in some embodiments.

[0023] Wherein, 1-shuttle core; 2-shuttle shell;

[0024] 101-First outer flange portion; 102-Winding shaft portion; 103-Second outer flange portion; 104-Shaft hole; 105-Anti-slip texture; 106-Anti-slip protrusion;

[0025] 201 - Shell bottom wall; 202 - Shell peripheral wall; 203 - Central axis. Detailed Implementation

[0026] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0028] like Figure 1 The bobbin 1 shown includes a plastic matrix and magnetic powder uniformly mixed in the plastic matrix. The bobbin 1 is an integrally molded part. The plastic matrix includes a winding shaft portion 102, a first outer flange portion 101 disposed at one end of the winding shaft portion 102, and a second outer flange portion 103 disposed at the other end of the winding shaft portion 102. The first outer flange portion 101 and the second outer flange portion 103 both extend outward along the radial direction of the winding shaft portion 102. A winding groove is defined between the first outer flange portion 101, the winding shaft portion 102, and the second outer flange portion 103.

[0029] By employing the aforementioned technical solution, magnetic powder is uniformly mixed into the plastic bobbin 1, making the bobbin 1 a magnet as a whole. On one hand, this retains the advantages of the plastic bobbin 1: light weight, moderate hardness, and ease of molding. The lightweight plastic bobbin 1 provides better braking effect and more stable stitches, while the moderate hardness effectively reduces the probability of needle breakage. On the other hand, by utilizing the mutual magnetic attraction between the bobbin 1 and the bobbin case 2, sufficient friction can be ensured for the bobbin 1 without the need for a spring plate. This provides the necessary damping to prevent the bobbin 1 from spinning freely due to inertia, eliminating the need for a spring plate in the bobbin case 2, avoiding the problems associated with spring plates, and reducing the number of parts. Furthermore, by eliminating the spring plate, the restrictions on the axial dimension of the bobbin 1 can be reduced, allowing for a larger axial dimension design. This enables the winding groove to accommodate more sewing thread, reducing the frequency of thread changes.

[0030] In practical implementation, the plastic matrix can be made of engineering plastics, such as polypropylene, polyethylene terephthalate, and polyoxymethylene. During manufacturing, magnetic powder is placed in a mold, and engineering plastic is injected to bond the magnetic powder together. The aforementioned shuttle core 1 is then formed through integral injection molding.

[0031] In specific implementation, the first outer flange portion 101 and the second outer flange portion 103 are usually arranged around the end of the winding shaft portion 102. When viewed from the side, the bobbin 1 is in the shape of an "I".

[0032] As a preferred example, such as Figure 2 As shown, the two ends of the bobbin 1 along the axial direction are the S magnetic pole and the N magnetic pole, respectively. With the above magnetic pole arrangement, when the bobbin 1 is installed in the bobbin case 2, the magnetic attraction force on the bobbin 1 allows the bobbin 1 to better abut against the bottom wall 201 of the bobbin case 2 along the axial direction, which can better ensure that the bobbin 1 receives sufficient friction force and provide the necessary damping to prevent the bobbin 1 from spinning idly due to inertia.

[0033] In practical implementation, after the bobbin 1 is injection molded, it is usually necessary to magnetize it. The bobbin 1 proposed in this application uses axial magnetization of the cross section, so that the two ends of the bobbin 1 in the axial direction are the S magnetic pole and the N magnetic pole, respectively.

[0034] The magnetic field strength of the bobbin 1 can be adjusted according to the magnetic attraction requirements of the bobbin 1. The magnetic field strength of the bobbin 1 can be adjusted by adjusting the amount of magnetic powder, the material of the magnetic powder and the magnetization intensity.

[0035] In some embodiments, such as Figure 1 and Figure 5 As shown, anti-slip texture 105 is provided on the outer peripheral surface of the winding shaft portion 102. The anti-slip texture 105 reduces the possibility of the sewing thread slipping relative to the bobbin 1, helping to ensure the normal operation of the bobbin 1. As a preferred example, the anti-slip texture 105 includes a strip-shaped groove extending axially along the winding shaft portion 102, and the strip-shaped groove is easy to form.

[0036] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the winding shaft portion 102 is provided with a shaft hole 104 that extends through the winding shaft portion 102 along its axial direction. An anti-slip protrusion 106 is provided on the inner circumferential surface of the shaft hole 104. The anti-slip protrusion 106 reduces the possibility of the bobbin 1 slipping relative to the shaft of the winder, which helps to ensure that the bobbin 1 winds smoothly.

[0037] As a preferred example, the anti-slip protrusion 106 is a rib that extends axially along the shaft hole 104.

[0038] like Figure 6 and Figure 7 As shown, this application also proposes a bobbin 1 mounting structure, including a bobbin case 2 and the bobbin 1 described in any of the above claims. The bobbin case 2 includes a bottom wall 201 and a peripheral wall 202 connected to the bottom wall 201. The bobbin 1 is mounted in the space enclosed by the bottom wall 201 and the peripheral wall 202. The end face of one axial end of the bobbin 1 contacts the bottom wall 201, and the bobbin 1 and the bottom wall 201 are magnetically attracted to each other. During the rotation of the bobbin 1, there is friction between the end face of one axial end of the bobbin 1 and the bottom wall 201. This friction provides the necessary damping to prevent the bobbin 1 from spinning freely.

[0039] As a preferred example, the bobbin case 2 is a metal part suitable for magnetic attraction with the bobbin core 1. Most bobbin cases 2 in the prior art are metal parts, such as steel bobbin cases 2. The bobbin core 1 proposed in this application can be used with most commercially available metal bobbin cases 2, and has the characteristic of wide applicability.

[0040] As a specific example, such as Figure 7 As shown, the shuttle case 2 is also provided with a central shaft portion 203 that mates with the shaft hole 104 of the shuttle core 1. The shuttle core 1 can rotate around the central shaft portion 203, and the peripheral wall 202 of the case is located around the shuttle core 1.

[0041] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model. In the description of this specification, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. A bobbin, characterized in that, The bobbin includes a plastic matrix and magnetic powder uniformly mixed into the plastic matrix. The bobbin is an integrally molded part. The plastic matrix includes a winding shaft portion, a first outer flange portion disposed at one end of the winding shaft portion, and a second outer flange portion disposed at the other end of the winding shaft portion. Both the first outer flange portion and the second outer flange portion extend outward along the radial direction of the winding shaft portion.

2. The bobbin according to claim 1, characterized in that, The two ends of the bobbin along its axial direction are the S magnetic pole and the N magnetic pole, respectively.

3. The bobbin according to claim 1, characterized in that, The outer circumferential surface of the winding shaft is provided with anti-slip texture.

4. The bobbin according to claim 3, characterized in that, The anti-slip texture includes strip-shaped grooves whose length extends axially along the winding shaft portion.

5. The bobbin according to claim 1, characterized in that, The winding shaft portion is provided with a shaft hole that extends through the winding shaft portion along its axial direction, and the inner circumferential surface of the shaft hole is provided with an anti-slip protrusion.

6. The bobbin according to claim 5, characterized in that, The anti-slip protrusion is a raised rib whose length extends along the axial direction of the shaft hole.

7. A bobbin mounting structure, characterized in that, The device includes a bobbin case and a bobbin core according to any one of claims 1-6. The bobbin case includes a bottom wall and a peripheral wall connected to the bottom wall. The bobbin core is installed in the space enclosed by the bottom wall and the peripheral wall. One end face of the bobbin core in the axial direction contacts the bottom wall. The bobbin core and the bottom wall are magnetically attracted to each other.

8. The bobbin mounting structure according to claim 7, characterized in that, The bobbin case is a metal part suitable for magnetic attraction with the bobbin.

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