A high capacity rotary hook

Abstract

The application discloses a large-capacity rotating hook, which is characterized in that an outer diameter of a first circular surface at a thread passing area of a hook frame is 1.0 times of that of a guide rail, and the first circular surface is concentric with the outer periphery of the guide rail. The thread is hooked by a hooking tip and is tightly wound on the thread passing area of the hook frame. The first circular surface of the thread passing area has an outer diameter of 1.0 times, and is concentric with the outer periphery of the guide rail. The thread demand in the winding stage is 1.0 times of the normal preset amount of the existing 1.0 times rotating hook, and the tension of the thread cannot be increased. On this basis, a multiplied inner hole cavity with an inner diameter of more than 1.0 times of a proper multiple is arranged, so that a bobbin with a larger thread capacity is installed and accommodated, and the thread capacity of the bobbin is improved. The application can increase the capacity of the inner cavity of the hook frame. In sewing and embroidering, the thread is wound on the corresponding position of the hook frame, the required amount of the thread is a standard normal thread amount, and the thread is released and recovered with a normal tension, so that the precision of sewing or embroidering cannot be affected.

Description

Technical Field

[0001] This invention relates to a high-capacity rotary hook, and more particularly to a high-capacity rotary hook that can improve the precision of sewing or embroidery. Background Technology

[0002] The standard rotary hooks that are used by default with corresponding sewing or embroidery machines have a thread capacity of 1.0. To reduce the thread change time of the sewing or embroidery machine bobbin, the thread capacity of the rotary hook is usually increased to allow for the installation of a bobbin with a larger thread capacity. For example, rotary hooks with a capacity of 1.6 are commonly used in the market. This inevitably increases the outer diameter of the bobbin while maintaining the thickness of the bobbin frame. During the sewing or embroidery process, when the rotating shuttle bed and the bobbin frame engage to hook the top thread and form a stitch by looping it around the bobbin frame, the top thread is initially tightly wrapped around the corresponding area on the outer circumference of the bobbin frame. After the shuttle bed rotates to a certain rotation angle, the top thread is released from the corresponding area on the bobbin frame under the action of the release surface, forming a knot as the thread loops around the bobbin frame. Finally, as the top thread is pulled back, it tightens and forms a stitch.

[0003] With an increased shuttle frame outer diameter, the amount of thread winding on the shuttle frame inevitably increases under a fixed rotation angle. However, the optimal thread feed and tension adjustment parameters for existing embroidery or sewing machines are set at a standard 1.0 times the rotary hook size. Therefore, the increased thread tension and winding amount during shuttle bed rotation can easily break the thread and / or break the needle, requiring machine downtime for troubleshooting. Furthermore, after the thread is hooked off the shuttle bed, the preset take-up amount is insufficient to adjust the stretched thread to appropriate tension during winding, severely impacting sewing or embroidery quality. Consequently, existing large-capacity rotary hooks are only used in applications with low sewing and embroidery quality requirements, severely limiting their application. Summary of the Invention

[0004] To address the problem of the inability to simultaneously achieve both thread capacity and precision in existing rotary hooks, this invention provides a high-capacity rotary hook with a simple structure that effectively increases thread capacity while maintaining sewing and embroidery precision, based on existing sewing and embroidery equipment.

[0005] The technical solution of this invention to solve the existing problems is: a large-capacity rotary shuttle, including a shuttle frame and a shuttle bed that cooperates with the shuttle frame. The shuttle frame is provided with a guide rail that cooperates with the rail groove on the inner wall of the shuttle bed. The shuttle frame is provided with an inner cavity for installing the shuttle core. As an improvement, the outer periphery of the shuttle frame is provided with a first arc surface with an outer diameter of 1.0 times the thread passing area of ​​the shuttle frame at least on the surface line. The outer periphery of the shuttle frame is also provided with a second arc surface that appropriately forms the circumference of the shuttle frame with the first arc surface. The inner diameter of the inner cavity is an increased inner cavity that is greater than 1.0 times the appropriate multiple. A central pillar concentric with the inner cavity is provided inside the cavity; the first arc surface is concentric with the outer circumference of the guide rail; the hook tip, the center of the outer circumference of the guide rail, and the center of the inner cavity are located on the same straight line; the hook tip is located on one side of the center of the outer circumference of the guide rail; the center of the inner cavity is located on the other side of the center of the outer circumference of the guide rail; the center of the inner cavity and the center of the outer circumference of the guide rail are spaced 0mm-0.6mm apart; the appropriate second arc surface and the appropriate multiple of the inner cavity must meet the requirements of the shuttle frame wall thickness of 0.4mm-1mm and the guide rail being able to properly cooperate with the inner wall groove of the shuttle bed.

[0006] As a further improvement, the guide rail is 1.0 times the reference guide rail.

[0007] As a further improvement, the second arc surface is a second circular arc surface; the center of the second arc surface, the hook tip, and the outer circumference center of the guide rail are located on the same straight line, the center of the second circular arc surface is located on the other side of the outer circumference center of the guide rail, and the center of the second circular arc surface and the outer circumference center of the guide rail are spaced 0.2mm-0.5mm apart.

[0008] As a further improvement, the outer diameter of the second arc surface is 1.0 times that of the guide rail, the first arc surface and the hook tip are located on one side of the outer circumference center of the guide rail, and the second arc surface is located on the other side of the outer circumference center of the guide rail; the arcs of the first arc surface and the second arc surface are both semicircles, and a stitching surface is provided between the first arc surface and the second arc surface; the center of the inner cavity and the outer circumference center of the guide rail are provided with a distance greater than 0 mm and less than or equal to 0.6 mm.

[0009] As a further improvement, the shuttle frame is provided with a derailment slope on the corresponding side of the guide rail in the area where the hook tip splits the thread. The derailment slope has an angle between the generatrix of the outer wall of the shuttle frame and the generatrix, which is 13°-26°.

[0010] As a further improvement, the angle between the derailment slope and the generatrix of the outer wall of the shuttle frame is 19°-26°.

[0011] As a further improvement, a smooth transition seam surface is provided between the second arc surface and the first arc surface to form a circumference around the shuttle frame.

[0012] As a further improvement, the outer diameter of the 1.0 times shuttle is 25.6 mm - 26.8 mm.

[0013] As a further improvement, the inner cavity is eccentrically positioned on the shuttle frame, offset from the derailment slope, and the center of the inner cavity is spaced 0mm-0.6mm from the center of the outer periphery of the guide rail.

[0014] As a further improvement, the inner cavity is a cavity with a capacity of 1.6 times.

[0015] Compared with the prior art, this invention features a first arc surface with an outer diameter of 1.0 times that of the thread guide area on the outer periphery of the shuttle frame. This first arc surface, along with a suitable second arc surface, forms the circumference of the shuttle frame. The first arc surface is concentrically positioned with the outer periphery of the guide rail. Therefore, during sewing or embroidery, the driven shuttle rotates relative to the guide rail via a groove. The thread hook on the shuttle frame, with the assistance of the shuttle frame, tightly wraps the thread around the thread guide area. Since the first arc surface of the thread guide area has an outer diameter of 1.0 times and is concentric with the outer periphery of the guide rail, the required amount of thread during the thread winding stage is 1.0 times the normal preset amount for a rotary shuttle in existing sewing or embroidery equipment, thus avoiding increased tension on the thread. Based on this, by aligning the hook tip, the outer circumference center of the guide rail, and the center of the inner cavity on the same straight line, with the hook tip located on one side of the outer circumference center of the guide rail and the center of the inner cavity located on the other side of the outer circumference center of the guide rail, and by translating to the other side of the outer circumference center of the guide rail, a distance of 0mm-0.6mm is created between the center of the inner cavity and the outer circumference center of the guide rail. This allows for the possibility of expanding the inner cavity, facilitating the setting of an inner cavity with an inner diameter greater than 1.0 times that of the guide rail, thereby installing a bobbin that can accommodate a larger thread capacity and increasing the thread capacity of the bobbin.

[0016] Its beneficial effect is that the present invention can increase the capacity of the cavity inside the shuttle frame. When sewing or embroidering, the top thread is wound around the corresponding part of the shuttle frame before forming the stitch. The required amount of top thread is the standard normal amount of top thread, and the top thread is released and retracted under normal tension, so as not to affect the accuracy of sewing or embroidery. Attached Figure Description

[0017] Figure 1-2 These are schematic diagrams of the rotary shuttle frame of the present invention from different perspectives.

[0018] Figure 3 This is a front view of the rotary hook of the present invention.

[0019] Figure 4 yes Figure 3 A bottom view.

[0020] Figure 5 yes Figure 4 A sectional view along the AA direction.

[0021] Figure 6 This is a schematic diagram of the angle of the rotary hook during normal use of the present invention.

[0022] Figure 7 This is a schematic diagram of the basic structure of the shuttle frame of the present invention.

[0023] Figure 8 This invention is Figure 7 BB-direction sectional view.

[0024] Figure 9 yes Figure 7 Enlarged schematic diagram at point a.

[0025] Figure 10 This is a schematic diagram of the rotary shuttle of the present invention. Detailed Implementation

[0026] See Figure 1-10 This embodiment describes a high-capacity rotary shuttle, including a shuttle frame 1 and a shuttle bed 6 that cooperates with the shuttle frame 1. The shuttle frame 1 is provided with a standard guide rail 2 that is 1.0 times the length of the guide rail and cooperates with the inner wall groove 61 of the shuttle bed 6. The shuttle frame 1 is provided with an inner cavity 3 for installing the shuttle core.

[0027] The outer periphery of the shuttle frame 1 is provided with a first arc surface 4 with an outer diameter of 1.0 times the first arc surface 4 in the thread-passing area of ​​the shuttle frame at least at the starting end face of the guide rail 2. The outer periphery of the shuttle frame is also provided with a suitable second arc surface 5 that forms a circle around the shuttle frame 1 with the first arc surface 4. The thread is in the thread-passing area of ​​the shuttle frame, that is, the area where the thread is wrapped around the shuttle frame 1 after being hooked by the hook tip 62 of the shuttle bed 6 and before the thread is unwound as the shuttle bed 6 rotates relative to the shuttle frame 1.

[0028] The inner diameter of the inner cavity 3 is an increased inner diameter by a suitable multiple greater than 1.0. A central post 32 concentric with the inner cavity 3 is provided inside the inner cavity 3. The central post 32 and the inner cavity 3 are mainly used to install the bobbin. The first arc surface 4 is concentric with the outer circumference of the guide rail 2. The hook tip 22, the outer circumference center of the guide rail 2 and the center of the inner cavity 3 are located on the same straight line. The hook tip 22 is located on one side of the outer circumference center of the guide rail 2. The center of the inner cavity 3 is located on the other side of the outer circumference center of the guide rail 2. The distance between the center of the inner cavity 3 and the outer circumference center of the guide rail 2 is 0mm-0.6mm. Since the hook tip 22 located on the outer circumference of the guide rail on the shuttle frame 1 usually has a thread-removing surface, in order to avoid interference between the doubled inner cavity 3 and the thread-removing surface (the inner cavity needs to penetrate the thread-removing surface), the center of the inner cavity 3 is set on the other side of the outer circumference of the guide rail. This offsets the inner cavity 3 by 0mm-0.6mm away from the thread-removing surface, allowing the inner cavity 3 to expand normally. Therefore, an appropriate second arc surface 5 needs to be selected. The appropriate second arc surface 5 and the appropriate multiple of the doubled inner cavity 3 must satisfy the wall thickness of the shuttle frame 1 (0.4mm-1mm) and the normal fit between the guide rail 2 and the inner wall groove 61 of the shuttle bed 6.

[0029] The second arc surface 5 and the first arc surface 4 may also be provided with a smooth transition seam surface that forms the circumference of the shuttle frame 1. The seam surface can be a smooth arc surface or a plane.

[0030] As an alternative, in order to further reduce the changes to shuttle 1, the standard shuttle bed of the existing equipment can be used directly.

[0031] The second arc surface 5 can be an irregular arc surface that does not affect the use of the guide rail 2 and ensures the wall thickness of the shuttle frame 1, such as a surface composed of multiple arcs of different radii, an ellipse, or other irregular arc surfaces. In the implementation example, for ease of manufacturing, the second arc surface 5 is a second circular arc surface; the center of the second arc surface 5, the hook tip 22, and the outer circumference center of the guide rail 2 are located on the same straight line, and the center of the second circular arc surface is located on the other side of the outer circumference center of the guide rail 2. The center of the second circular arc surface and the outer circumference center of the guide rail 2 are spaced 0.2mm-0.5mm apart, thereby ensuring the increased capacity of the inner cavity 3 and the wall thickness of the shuttle frame.

[0032] As a further optimization, the outer diameter of the second arc surface is 1.0 times the outer diameter of the guide rail 2. The first arc surface 4 and the hook tip 22 are located on one side of the outer circumference center of the guide rail 2, and the second arc surface is located on the other side of the outer circumference center of the guide rail 2. The arcs of the first arc surface 4 and the second arc surface are both semicircles. A stitching surface 8 is provided between the first arc surface 4 and the second arc surface 2. The center of the inner cavity 3 and the outer circumference center of the guide rail 2 are spaced apart by a distance greater than 0 mm and less than or equal to 0.6 mm. The stitching surface 8 is preferably a stitching surface 8 that smoothly stitches the first and second arc surfaces.

[0033] The shuttle frame 1 has a thread-removing inclined surface 7 on the corresponding side of the guide rail 2 in the thread-passing area of ​​the hook tip 22. The thread-removing inclined surface 7 provides a better thread-removing surface, making thread removal easier. The thread-removing inclined surface 7 forms an angle with the generatrix of the outer wall surface of the shuttle frame 1, with an angle of 13°-26°. Alternatively, the angle between the thread-removing inclined surface 7 and the generatrix of the outer wall surface of the shuttle frame 1 can be 19°-26°. See also... Figure 4 , 8 The included angle is preferably 19°.

[0034] The inner cavity 3 is eccentrically positioned on the shuttle frame 1, offset from the derailment inclined surface 7. The center of the inner cavity 3 is spaced 0mm-0.6mm from the outer center of the guide rail 2.

[0035] Typically, the outer diameter of shuttle frame 1 (1.0x) is 25.6 mm - 26.8 mm. (See attached image) Figure 1-10 In the first arc surface, which is 1.0 times larger, the center of the arc is offset by 0.3mm to the side away from the hook tip 22. Taking the inner cavity 3 with a capacity of 1.6 times as an example, the outer diameter of the first arc surface (1.0 times larger) is φ26. Therefore, the center of the inner cavity 3 with a capacity of 1.6 times larger is offset by 0.5mm to the side away from the hook tip 22. The inner diameter of the inner cavity 3 with a capacity of 1.6 times larger is φ24.6mm-24.8mm. Typically, φ24.6mm or 24.8mm can be selected. In this case, the thinnest part of the shuttle frame 1 wall thickness is 0.5mm or 0.4mm, which fully meets the requirements.

[0036] For ease of description, in this implementation example, the center of the outer perimeter of guide rail 2 is designated as the first center 21, the center of the inner cavity 3 as the second center 31, and the center of the second arc surface 5 as the third center 51. See also... Figure 5-8 As shown in the angle, the hook tip 22 of the guide rail 2 is positioned to the left of the first center 21. The second center 31 is offset to the right by 0.5mm on the line connecting the hook tip 22 and the first center 21, thus causing the inner cavity 3 to be eccentrically positioned on the shuttle frame 1 by 0.5mm. The third center 51 is offset to the right by 0.3mm on the line connecting the hook tip 22 and the first center 21. While ensuring that the wall thickness of the shuttle frame 1 is between 0.4mm and 1mm to meet usage requirements, the inner cavity 3 is ensured to have sufficient expansion capacity and will not interfere with the thread-removing inclined surface 7 located to the left of the first center 21. The inner cavity 3 is eccentrically positioned on the shuttle frame 1, offset from the thread-removing inclined surface 7.

[0037] See Figure 6As shown, the shuttle frame 1 has an inner cavity with a capacity of 1.6 times. During the process of sewing or embroidering to form a stitch, the shuttle bed 6 rotates relative to the doubled inner cavity 3, which is greater than 1.0 times larger. The needle drives the thread 9 to the appropriate position to cooperate with the rotary hook, and the thread loop is hooked by the hook tip 62 on the shuttle bed 6. The shuttle bed drives the hook tip 62 to rotate around the shuttle frame 1 to prepare for the thread to wrap around the shuttle frame 1 to form a stitch. In the initial stage of stitch formation, before the shuttle bed 6 rotates to the unwinding angle, with the cooperation of the hook tip 22, the thread is wrapped around the corresponding position on the first arc surface 4, which is 1.0 times the outer diameter of the shuttle frame 1. Since the first arc surface 4 is concentric with the outer circumference of the guide rail, the amount of thread passing through the shuttle bed during the winding process is equal to the amount of thread passing through 1.0 times the standard rotary hook. When the shuttle bed 6 continues to rotate to the angle where the thread can be unwound, with the cooperation of the unwinding surface, the thread loop will unwound on the shuttle frame 1 and wrap around the shuttle frame 1. At this time, the thread has been gradually recovered and knotted, so the size of the second arc surface 5 will not affect the tension of the thread.

Claims

1. A high-capacity rotary shuttle, comprising a shuttle frame and a shuttle bed cooperating with the shuttle frame, wherein the shuttle frame is provided with a standard guide rail of 1.0 times the length that mates with the rail groove on the inner wall of the shuttle bed, and the shuttle frame is provided with an inner cavity for installing the shuttle core, characterized in that: The outer periphery of the shuttle frame is provided with a first arc surface with an outer diameter of 1.0 times the thread passing area of ​​the shuttle frame. The outer periphery of the shuttle frame is also provided with a second arc surface that appropriately forms the circumference of the shuttle frame with the first arc surface. The inner diameter of the inner cavity is an increased inner cavity by an appropriate multiple greater than 1.0 times. A central column concentric with the inner cavity is provided within the inner cavity. The first arc surface is concentrically arranged with the outer periphery of the guide rail. The hook tip, the center of the outer periphery of the guide rail, and the center of the inner cavity are located on the same straight line. The hook tip is located on one side of the center of the outer periphery of the guide rail; the center of the inner cavity is located on the other side of the center of the outer periphery of the guide rail. The center of the inner cavity and the center of the outer periphery of the guide rail are spaced 0mm-0.6mm apart. The appropriate second arc and the appropriately increased inner cavity must satisfy the requirement that the wall thickness of the shuttle frame is 0.4mm-1mm and that the guide rail can properly mate with the inner wall groove of the shuttle bed.

2. The high-capacity rotary shuttle as described in claim 1, characterized in that: The second arc surface is a second circular arc surface; the center of the second arc surface, the hook tip, and the center of the outer periphery of the guide rail are located on the same straight line, the center of the second circular arc surface is located on the other side of the center of the outer periphery of the guide rail, and the center of the second circular arc surface and the center of the outer periphery of the guide rail are spaced 0.2mm-0.5mm apart.

3. The high-capacity rotary shuttle as described in claim 2, characterized in that: The outer diameter of the second arc surface is 1.0 times that of the guide rail. The first arc surface and the hook tip are located on one side of the outer circumference center of the guide rail, and the second arc surface is located on the other side of the outer circumference center of the guide rail. The inner cavity center and the outer circumference center of the guide rail are provided with a distance greater than 0 mm and less than or equal to 0.6 mm.

4. The high-capacity rotary shuttle as described in claim 2 or 3, characterized in that: The arcs of the first and second arc surfaces are both semicircles, and a seam surface is provided between the first and second arc surfaces.

5. The high-capacity rotary hook as described in claim 1, characterized in that: The shuttle frame is provided with a derailment slope on the corresponding side of the guide rail in the area where the hook tip splits the thread. The derailment slope has an angle between the generatrix of the outer wall of the shuttle frame and the angle is 13°-26°.

6. The high-capacity rotary hook as described in claim 5, characterized in that: The angle between the derailment slope and the generatrix of the outer wall of the shuttle frame is 19°-26°.

7. The high-capacity rotary hook as described in claim 1, characterized in that: The second arc surface and the first arc surface are further provided with a smooth transition seam surface that forms the circumference of the shuttle frame.

8. The high-capacity rotary hook as described in claim 1, characterized in that: The outer diameter of the 1.0 times shuttle frame is 25.6 mm-26.8 mm.

9. The high-capacity rotary hook as described in claim 5, characterized in that: The inner cavity is eccentrically positioned on the shuttle frame, offset from the derailment slope, and the center of the inner cavity is spaced 0mm-0.6mm from the center of the outer periphery of the guide rail.

10. The high-capacity rotary shuttle as described in claim 1, characterized in that: The inner cavity is 1.6 times the capacity of the inner cavity.

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