Inner shuttle frame of rotating shuttle

Abstract

The utility model provides an inner shuttle frame of a rotating shuttle, which comprises an inner shuttle frame body, the inner shuttle frame body comprises a guide rail which is arranged on the inner shuttle frame and is partially or completely plated with a DLC coating, and the surface of the part of the guide rail, which is completely or at least matched with a guide groove of an outer shuttle frame, is provided with a DLC coating. The inner shuttle frame body further comprises an outer wall which is completely plated with a chromium coating except for the guide rail; or the inner shuttle frame body is at least provided with a chromium-plated coating on the wire winding and passing surface part. According to the utility model, the DLC coating is plated on the guide rail, and the other parts are plated with chromium, so that the hardness is ensured, and meanwhile, the off-line is convenient.

Description

Technical Field

[0001] This utility model relates to the field of rotary shuttle technology, and in particular to an inner shuttle frame for a rotary shuttle. Background Technology

[0002] A rotary hook is used to hook the top thread on the needle of a sewing or embroidery machine, rotate it, and then pass it around the bottom thread in the bobbin of the inner shuttle frame to form a stitch. A rotary hook consists of an outer shuttle frame and an inner shuttle frame, which are connected by a guide groove in the outer shuttle frame and a guide rail on the inner shuttle frame. During operation, the outer shuttle frame rotates on the inner shuttle frame, and the outer shuttle frame is used to hook the thread, cooperating with the inner shuttle frame.

[0003] There is a fully chrome-plated inner shuttle frame. The chrome coating has a small surface roughness and is easy to polish smooth, but it has low hardness and is prone to wear during high-speed rotation. In particular, the guide rail of the inner shuttle frame needs to slide in coordination with the guide groove of the outer shuttle frame, so the guide rail part is more prone to wear, resulting in a short service life of the inner shuttle frame.

[0004] To increase surface hardness, there is also a DLC (diamond-like carbon) coating. This coating has high hardness, but its surface roughness is also high, resulting in high friction. If the entire inner shuttle frame surface is coated with a DLC coating, the thread guide surface of the inner shuttle frame is relatively rough, resulting in high friction. When winding and knotting, the thread is not easy to unravel on the inner shuttle frame, which prolongs the unraveling time. At the same time, the difficulty in unraveling during winding and knotting makes the thread path on the inner shuttle frame longer, which is not conducive to the shrinkage of the top thread. In addition, when the entire inner shuttle frame is coated with a DLC coating, due to the special properties of the DLC coating, a knife edge can easily form at the joint between the inner shuttle frame guide rail and the inner shuttle frame body. When the rotary hook is winding and knotting, the knife edge can easily cut the sewing thread. Utility Model Content

[0005] To address the problems of the prior art, this invention provides an inner shuttle frame for a rotary shuttle that ensures both hardness and wear resistance while preventing thread jamming and breakage.

[0006] The technical solution adopted is as follows:

[0007] An inner shuttle frame for a rotary shuttle includes an inner shuttle frame body, the inner shuttle frame body including a guide rail disposed on the inner shuttle frame, the surface of the guide rail that mates with the guide groove of the outer shuttle frame having a DLC coating, the inner shuttle frame body also including an outer wall with a chrome-plated coating except for the guide rail portion; or the inner shuttle frame body having a chrome-plated coating at least on the winding and passing portion.

[0008] Furthermore, the outer wall of the inner shuttle frame body is provided with a guide surface, which is located below the guide rail, and the surface of the guide surface is provided with a chrome-plated coating.

[0009] Furthermore, the guide rail includes a head end and an end end, and a notch for removing the thread is provided between the head end and the end end of the guide rail, and the surface of the notch for removing the thread is coated with a chrome plating.

[0010] Furthermore, the outer wall is provided with a tapered inclined surface at the lower end of the guide wire surface and the wire breakage notch of the inner shuttle body, and the surface of the tapered inclined surface is provided with a chrome-plated coating.

[0011] Furthermore, the first end of the guide rail is inclined with a downward-facing chrome-plated guide slope, the guide slope is connected to the tapered slope, and the surface of the guide slope is provided with a chrome-plated coating or a DLC coating.

[0012] Furthermore, the end of the guide rail is provided with a transition surface with a chrome-plated coating or a DLC-plated coating facing the tapered slope.

[0013] Furthermore, the bottom of the inner shuttle frame body is provided with a flat bottom surface.

[0014] Furthermore, an arc transition is provided between the guide surface and the conical inclined surface, and between the conical inclined surface and the bottom surface of the inner shuttle frame body.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model provides an inner shuttle frame for a rotary shuttle, including a guide rail located on the outer wall of the inner shuttle frame and sliding in cooperation with the guide groove of the outer shuttle frame. The guide rail has a DLC coating on all or at least the surface where it mates with the guide groove of the outer shuttle frame, enhancing its hardness and wear resistance. When the outer shuttle frame rotates at high speed, the guide groove slides in cooperation with the guide rail, generating friction. Therefore, the DLC coating on the guide rail can extend its service life. Alternatively, a chrome coating can be applied to other parts besides the guide rail; or a chrome coating can be applied to at least the thread-passing surface of the inner shuttle frame body. The chrome coating surface is easy to smooth, and as the rotary shuttle rotates, the thread winds around the thread-passing surface of the inner shuttle frame. When the thread loop passes through, it is less likely to snag or break, reducing thread resistance and facilitating thread loop tightening. Preferably, chrome plating can be applied partially to the guide rail, specifically to the second guide slope at the beginning of the guide rail and the transition surface at the end. When the thread loop passes through these two locations, the smoothness and resistance are low, facilitating thread loop contraction and tightening. Attached Figure Description

[0017] Figure 1-3 These are schematic diagrams of the structure of this utility model from different angles;

[0018] Among them, the inner shuttle body 1, guide rail 2, first end 201, second end 202, thread breakage notch 203, outer wall 3, guide surface 4, conical inclined surface 5, guide inclined surface 6, transition surface 7, and bottom surface 8. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] refer to Figure 1-3 An inner shuttle frame for a rotary shuttle includes an inner shuttle frame body 1. The inner shuttle frame body 1 includes guide rails 2 disposed on the inner shuttle frame. The surfaces of all or at least the parts of the guide rails 2 that mate with the guide grooves of the outer shuttle frame are coated with DLC (Digital Chromium Sulfate). The guide rails 2 mate with the guide grooves of the outer shuttle frame (not shown in the figure). The inner shuttle frame body 1 also includes an outer wall 3 that is entirely chrome-plated except for the parts of the guide rails 2; or the inner shuttle frame body 1 has a chrome-plated coating on at least the part where the thread is wound and passed through. Preferably, the inner shuttle frame body 1 can typically have a chrome-plated coating on all parts except for the guide rails, which are all coated with DLC.

[0021] The guide rail 2 on the inner shuttle frame body 1 is located on the outer side wall of the inner shuttle frame. The inner shuttle frame body 1 is installed inside the outer shuttle frame. The guide rail 2 on the circumference of the inner shuttle frame is slidably connected to the guide groove inside the outer shuttle frame, so that the inner shuttle frame and the outer shuttle frame can rotate relative to each other. During sewing, the outer shuttle frame will rotate at high speed, and the guide rail and the guide groove will generate friction, so the guide rail 2 is easy to wear. The outer part or all of the guide rail is coated with DLC coating to increase the hardness of the guide rail 2, increase the wear resistance of the guide rail 2, and extend the service life of the inner shuttle frame.

[0022] Although DLC coating has advantages such as high hardness and wear resistance, its surface is rough and has high friction. If DLC coating is applied to the outer wall 3, the thread loop is prone to getting caught on the outside of the DLC coating when tightening, which is not conducive to thread shrinkage. Since the outer wall of the inner shuttle frame has guide bevels, tapered bevels, and guide surfaces, if the surface is too rough, a knife edge can easily form at the junction between the surfaces, cutting the thread loop. Although chromium coating has low hardness, it is easy to polish smooth and has low roughness. Therefore, chromium coating is applied to other parts except the guide rail; or chromium coating is applied to at least the thread-winding surface on the inner shuttle frame body 1, making the outer wall 3 of the inner shuttle frame smooth, so that the thread loop is less likely to get caught or cut when passing through the outer wall.

[0023] The guide rail 2 includes a head end 201 and an end end 202, and a thread-removal notch 203 is provided between the head end and the end end of the guide rail 2. The thread-removal notch 203 facilitates thread removal.

[0024] The outer wall of the inner shuttle body 1 is provided with a guide surface 4, which is located below the guide rail 2. The outer wall 3 is provided with a tapered inclined surface 5 at the lower end of the guide surface 4 and the thread-removing notch 203. Preferably, the surface of the guide surface 4 is provided with a chrome-plated coating; the surface of the thread-removing notch 203 is provided with a chrome-plated coating; and the surface of the tapered inclined surface 5 is provided with a chrome-plated coating.

[0025] Preferably, the first end 201 of the guide rail is provided with a downward-facing chrome-plated guide slope 6, which is connected to the tapered slope 5. The last end 202 of the guide rail is provided with a downward-facing chrome-plated transition surface 7, and the bottom of the inner shuttle frame body 1 is provided with a flat bottom surface 8.

[0026] During sewing, the inner shuttle body 1 and the outer shuttle rotate relative to each other. The needle drives the top thread through the fabric to form a loop. The outer shuttle hooks the loop and continues to rotate. Half of the loop slides out from the top of the shuttle, and the other half slides from the bottom of the inner shuttle, trapping the bottom thread in the middle. Then, the loop is tightened, forming a stitch on the fabric. Because the loop needs to slide out from the bottom of the inner shuttle, the guide surface 4 will contact the loop during the unwinding process. The conical bevel 6 guides the loop to the bottom surface 8 of the inner shuttle, facilitating unwinding and reducing thread resistance. When wrapping and knotting, the loop first contacts the guide bevel 6, which guides the loop to the conical bevel 5 and finally to the bottom surface 8. The guide bevel and conical bevel are chrome-plated and smooth. Furthermore, there are arc transitions between the guide surface 4 and the conical bevel 5, and between the conical bevel 5 and the bottom surface 8, which further facilitates unwinding and reduces thread resistance.

[0027] The end 202 of the guide rail is provided with a downward-facing chrome-plated transition surface 7. When the wire loop comes off from the wire release notch 203, it may come into contact with the transition surface 7. The transition surface 7 is chrome-plated to make its surface smooth, and at the same time, the transition surface is provided with an arc transition to facilitate wire release and prevent wire snagging.

[0028] The other structures of the inner shuttle body 1 can be entirely based on existing technologies.

[0029] In this application, the end where the bottom surface 8 of the inner shuttle frame is located is the lower end, and the end where the opening of the inner shuttle frame is located is the upper end.

[0030] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An inner hook holder of a rotating hook, comprising an inner hook holder body (1), characterized in that: The inner shuttle frame body (1) comprises guide rails (2) arranged on the inner shuttle frame, the surfaces of the guide rails (2) are provided with DLC coating at all or at least the positions matched with the guide grooves of the outer shuttle frame, and the outer wall (3) of the inner shuttle frame body (1) is provided with chromium plating coating except the positions of the guide rails (2); or the inner shuttle frame body (1) is provided with chromium plating coating at least around the wire passing surface.

2. The inner hook carrier of a rotary hook as claimed in claim 1, characterized in that: The outer side wall of the inner shuttle frame body (1) is provided with a wire passing surface (4) located below the guide rails (2), and the surface of the wire passing surface (4) is provided with chromium plating coating.

3. The inner hook carrier of the rotary hook as claimed in claim 1, characterized in that: The guide rails (2) comprise a first end (201) and a last end (202), and a wire breaking gap (203) is arranged between the first end and the last end of the guide rails (2), and the surface of the wire breaking gap (203) is provided with chromium plating coating.

4. The inner hook carrier of the rotary hook as claimed in claim 3, characterized in that: The outer wall (3) is provided with a tapered surface (5) at the lower end of the wire passing surface (4) and the wire breaking gap (203) of the inner shuttle frame body (1), and the surface of the tapered surface (5) is provided with chromium plating coating.

5. The inner hook carrier of the rotary hook as claimed in claim 4, characterized in that: The first end (201) of the guide rails is provided with a downward chromium plating guide inclined surface (6), the guide inclined surface (6) is connected with the tapered surface (5), and the surface of the guide inclined surface (6) is provided with chromium plating coating or DLC coating.

6. The inner hook carrier of a rotary hook as claimed in claim 3 wherein: The last end (202) of the guide rails is provided with a downward transition surface (7) provided with chromium plating coating or DLC coating.

7. The inner hook carrier of a rotary hook as claimed in claim 1, characterized in that: The bottom of the inner shuttle frame body (1) is provided with a flat bottom surface (8).

8. The inner hook carrier of the rotary hook as claimed in claim 5, characterized in that: A circular arc surface transition is arranged between the wire passing surface (4) and the tapered surface (5) and between the tapered surface (5) and the bottom surface (8) of the inner shuttle frame body (1).

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