Self-cleaning bobbin

Abstract

The application provides a self-cleaning rotary hook, which comprises an outer hook, an inner cavity arranged on the outer hook, and an opening arranged on the outer hook and used for blowing air flow outside the rotary hook to the bottom wall of the inner cavity; a plurality of cleaning grooves are arranged on the bottom wall of the inner cavity, the plurality of cleaning grooves are distributed in a circumferential direction around the axis of the outer hook, the bottom wall of the cleaning groove is arranged in an inclined manner and is connected with the bottom wall of the inner cavity, during the working process of the rotary hook, the sewing thread is continuously rubbed against the surface of the rotary hook, thus causing the thread fluff to fall off, part of the thread fluff is gathered in the cleaning groove, along with the high-speed rotation of the outer hook, the air flow outside flows on the surface of the inner cavity through the opening, at this time, the pressure in the cleaning groove is lower than the pressure at the bottom wall of the inner cavity, the air flow pushes the thread fluff in the cleaning groove to flow along the bottom wall of the cleaning groove to the bottom wall of the inner cavity, so that the thread fluff is thrown out of the outer hook, the automatic cleaning of the thread fluff in the rotary hook is realized, the manual cleaning process of the thread fluff in the rotary hook is saved, the risk of thread breakage is reduced, and the working efficiency of the sewing machine can be improved.

Description

Technical Field

[0001] This application relates to the field of sewing machine accessories, and in particular to self-cleaning rotary hooks. Background Technology

[0002] The rotary shuttle is the core component of a sewing machine that forms a double-lock stitch. It includes structures such as an outer shuttle and an inner shuttle. The inner shuttle is fitted inside the cavity of the outer shuttle, and the outer shuttle rotates at high speed around the axis of the inner shuttle.

[0003] During use, the tip of the outer shuttle hooks onto the loop of the needle. As the shuttle tip rotates, the process includes a thread separation stage and a thread unwinding stage.

[0004] During the high-speed rotation of the outer shuttle, both the inner and outer shuttles rub against the thread ring. At this time, if... Figure 1 As shown, lint from the loops remains on the bottom wall of the inner cavity 10 of the outer shuttle 1. Since there is usually lubricating oil residue on the bottom wall of the inner cavity 10 of the outer shuttle 1, the lint clumps together and sticks to the bottom wall of the inner cavity 10 of the outer shuttle 1. Over time, as the lint accumulates, it will scrape against the lint during the unwinding stage of the loops on the inner shuttle, which can easily cause the loops to break. Therefore, it is necessary to clean the lint in the inner cavity 10 of the outer shuttle 1 regularly, which affects the working efficiency of the sewing machine.

[0005] Therefore, how to design a rotary hook structure that can automatically clean the lint in the outer shuttle has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] This application provides a self-cleaning rotary hook to at least solve the above-mentioned technical problems existing in the prior art.

[0007] A self-cleaning rotary shuttle is provided, including an outer shuttle and an inner cavity and an opening disposed on the outer shuttle. The opening is disposed on the outer shuttle to blow airflow from the outside of the rotary shuttle toward the bottom wall of the inner cavity. Several cleaning tanks are provided and located on the bottom wall of the inner cavity. The cleaning tanks are distributed circumferentially around the axis of the outer shuttle. The bottom wall of the cleaning tank is inclined and connected to the bottom wall of the inner cavity.

[0008] In one embodiment, the longitudinal section of the bottom wall of the cleaning tank is arc-shaped, V-shaped, or L-shaped.

[0009] In one embodiment, the plane containing the bottom wall of the cleaning tank and the bottom wall of the inner cavity forms a first angle.

[0010] In one embodiment, the angle of the first included angle is between 5° and 15°.

[0011] In one embodiment, the cleaning tank is located at the junction of the bottom wall and the side wall of the inner cavity.

[0012] In one embodiment, a first point and a second point are sequentially provided in the rotation direction of the outer shuttle, and the depth of the first point on the bottom wall of the cleaning tank is greater than the depth of the second point on the bottom wall of the cleaning tank.

[0013] In one embodiment, the opening includes a first opening and a second opening. The first opening is disposed on the side wall at the tip of the outer shuttle and is connected to the inner cavity. The second opening is disposed on the bottom wall of the inner cavity and penetrates the outer shuttle.

[0014] In one embodiment, the cleaning tank includes a first cleaning tank area and a second cleaning tank area. In the first cleaning tank area, the bottom wall of the cleaning tank is connected to the inner cavity near the second opening, and in the second cleaning tank area, the bottom wall of the cleaning tank is connected to the inner cavity near the first opening.

[0015] Compared with the prior art, the self-cleaning rotary hook of this application has the following beneficial effects: This application provides a cleaning groove on the bottom wall of the outer shuttle's inner cavity. After the thread falls into the inner cavity, the thread loop carries the thread to the cleaning groove and they converge. As the outer shuttle rotates at high speed, external airflow flows through the opening on the surface of the inner cavity. At this time, the pressure inside the cleaning groove is lower than the pressure at the bottom wall of the inner cavity. The airflow pushes the thread in the cleaning groove along the bottom wall of the cleaning groove towards the bottom wall of the inner cavity, thereby throwing the thread out of the outer shuttle. This achieves automatic cleaning of the thread inside the rotary shuttle, eliminating the need for manual cleaning of the thread inside the rotary shuttle, reducing the risk of thread breakage, and improving the operating efficiency of the sewing machine.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0018] Figure 1 A schematic diagram of the structure of a conventional external shuttle is shown; Figure 2 This invention provides a schematic diagram of the overall structure of the outer shuttle. Figure 3 A top view of the outer shuttle of this application is shown; Figure 4 This application shows Figure 3 Sectional view of AA; Figure 5 A cross-sectional view of the cleaning tank in this application is shown.

[0019] Explanation of the labels in the diagram: 1. Outer shuttle; 10. Inner cavity; 101. First point; 102. Second point; 11. Opening; 111. First opening; 112. Second opening; 12. Spindle tip; 2. Cleaning tank; 21. First cleaning tank area; 22. Second cleaning tank area; 3. First included angle. Detailed Implementation

[0020] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The existing rotary shuttle includes an outer shuttle 1 and an inner shuttle inserted into the inner cavity 10 of the outer shuttle 1. The axis of the outer shuttle 1 coincides with the axis of the inner shuttle. During operation, the outer shuttle 1 rotates at high speed around the inner shuttle.

[0022] Specifically, such as Figure 1 As shown, the outer shuttle 1 is provided with a shuttle tip 12, which hooks the thread on the sewing machine needle. The thread is punched open on the shuttle tip 12 to form a loop, which is pre-hooked on the thread divider hook of the inner shuttle. When the outer shuttle 1 continues to rotate with the loop, it will pass around the bottom thread in the inner shuttle, thus realizing the snapping of the loop and the bottom thread. Finally, the loop is unhooked from the inner shuttle, completing the sewing step.

[0023] During this process, the thread loop will move within the gap between the inner cavity 10 of the outer shuttle 1 and the inner shuttle. At this time, the thread lint on the thread loop is likely to remain on the bottom wall of the inner cavity 10.

[0024] Because the outer shuttle 1 of the rotary hook needs to rotate at high frequency and is supplied with lubricating oil, lubricating oil will remain on the bottom wall surface of the inner cavity 10 of the outer shuttle 1. At this time, the yarn fibers in the inner cavity 10 of the outer shuttle 1 are prone to adhering to the lubricating oil and clump together. The yarn fibers are difficult to shake out of the inner cavity 10 of the outer shuttle 1. At this time, after the yarn loop detaches from the inner shuttle, it is easy to be jammed by the yarn fibers in the inner cavity 10, which increases the risk of yarn breakage.

[0025] Therefore, it is necessary to clean the lint in the inner cavity 10 of the outer shuttle 1 regularly.

[0026] Example 1: To address the issue of lint residue remaining in the inner cavity 10 of the outer shuttle 1, in this embodiment, as follows: Figure 2 As shown, it includes several cleaning grooves 2, wherein several cleaning grooves 2 are arranged on the bottom wall of the inner cavity 10 of the outer shuttle 1. The cleaning grooves 2 are evenly distributed around the circumference of the outer shuttle 1. The bottom wall of the cleaning groove 2 is inclined and smoothly connected to the plane of the inner cavity 10. The outer shuttle 1 is also provided with an opening 11 to guide the external airflow to the bottom wall of the inner cavity 10. In actual operation, the thread ring is detached from the inner shuttle and then pulled out from the gap between the bottom wall of the inner cavity 10 and the inner shuttle. At this time, the thread ring pushes the thread into the cleaning tank 2. The outer shuttle 1 rotates at high speed. At this time, the external airflow will flow through the bottom wall plane of the inner cavity 10. Since the cleaning tank 2 is concave downward, the pressure inside the cleaning tank 2 is lower than the pressure at the bottom wall of the inner cavity 10. When the airflow flows, it will suck out the thread in the cleaning tank 2 and then, through the high-speed rotation of the outer shuttle 1, the thread will be thrown out of the outer shuttle 1 by the airflow.

[0027] During this process, the lint can smoothly transition from the bottom wall of the cleaning tank 2 to the bottom wall of the inner cavity 10.

[0028] Example 2: This embodiment is an improvement based on Embodiment 1, such as... Figure 4 As shown, the longitudinal section of cleaning tank 2 is inclined in the shape of an L.

[0029] It is worth noting that one side wall of the cleaning tank 2 is a right-angled side, and the bottom wall is a right-angled side. The bottom wall of the cleaning tank 2 is inclined to form a first angle 3 with the plane where the bottom wall of the inner cavity 10 is located. The angle of the first angle 3 is between 5° and 15°. Specifically, in this embodiment, the first angle 3 is 10°.

[0030] Example 3: This embodiment is an improvement based on Embodiment 1, such as... Figure 5 As shown, the longitudinal section of the cleaning tank 2 is V-shaped with the opening facing the bottom wall of the inner cavity 10, or the bottom wall of the longitudinal section of the cleaning tank 2 is arc-shaped, and the bottom wall of the cleaning tank 2 is smoothly connected to the plane containing the bottom wall of the inner cavity 10.

[0031] Example 4: This embodiment is an improvement on Embodiments 2 and 3, wherein the cleaning tank 2 is located at the junction of the bottom wall and the side wall of the inner cavity 10.

[0032] Since the outer shuttle 1 is in a high-speed rotating state, the lint adhering to the bottom wall of the inner cavity 10 will move towards the junction of the bottom wall and the side wall of the inner cavity 10 under the action of centrifugal force. The cleaning tank 2 is set at this position to facilitate the gathering of lint, so that the lint clumps together in the inner cavity of the cleaning tank 2. After the lint clumps together, the weight of the clump increases. At this time, the adsorption force of the lubricating oil on the clump is affected by the weight of the clump, and the clump is easily thrown out of the inner cavity of the outer shuttle 1 by the guide of the bottom wall of the cleaning tank 2.

[0033] Example 5: This embodiment is a further improvement on Embodiments 2 and 3.

[0034] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, the opening 11 includes a first opening 111 and a second opening 112. The first opening 111 is located at the tip 12 of the outer shuttle 1 and is located on the side wall of the outer shuttle 1, communicating with the inner cavity 10 of the outer shuttle 1. The second opening 112 is located on the bottom wall of the inner cavity 10 and penetrates the outer shuttle 1. The bottom wall of the inner cavity 10 is provided with a first cleaning groove area 21 and a second cleaning groove area 22. The first cleaning groove area 21 is provided with two cleaning grooves 2, and the second cleaning groove area 22 is provided with three cleaning grooves 2. Along the rotation direction of the outer shuttle 1, the bottom wall of the inner cavity 10 is also provided with a first point 101 and a second point 102 in sequence. The depth of the bottom wall of the cleaning groove 2 at the first point 101 from the bottom wall of the inner cavity 10 is greater than the depth of the bottom wall of the cleaning groove 2 at the second point 102 from the bottom wall of the inner cavity 10.

[0035] Furthermore, the bottom wall of the cleaning tank 2 in the first cleaning tank area 21 extends toward the second opening 112, and the bottom wall of the cleaning tank 2 in the second cleaning tank area 22 extends toward the first opening 111.

[0036] With the above settings, as Figure 2 and Figure 3 As shown, the outer shuttle 1 rotates counterclockwise. The airflow entering from the first opening 111 flows to the first cleaning groove area 21, where the airflow flows out from the second opening 112, and drives the ball of thread in the cleaning groove 2 in the first cleaning groove area 21 to be thrown out of the outer shuttle 1 from the second opening 112. The airflow entering from the second opening 112 flows through the second cleaning groove area 22 and flows out from the first opening 111. The ball of thread in the cleaning groove 2 in the second cleaning groove area 22 is thrown out of the outer shuttle 1 from the first opening 111 along with the airflow, realizing the automatic cleaning of the thread in the inner cavity of the outer shuttle 1, reducing the manual cleaning process of the thread in the outer shuttle 1, and improving the working efficiency of the sewing machine.

[0037] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A self-cleaning rotary shuttle, comprising an outer shuttle (1) and an inner cavity (10) disposed on the outer shuttle (1), characterized in that, An opening (11) is provided on the outer shuttle (1) to blow the airflow from the outside of the shuttle toward the bottom wall of the inner cavity (10); Cleaning tank (2), a number of cleaning tanks (2) are provided and located on the bottom wall of the inner cavity (10). The cleaning tanks (2) are distributed circumferentially around the axis of the outer shuttle (1). The bottom wall of the cleaning tank (2) is inclined and connected to the bottom wall of the inner cavity (10).

2. The self-cleaning rotary hook according to claim 1, characterized in that, The longitudinal section of the bottom wall of the cleaning tank (2) is arc-shaped, V-shaped, or L-shaped.

3. The self-cleaning rotary hook according to claim 1, characterized in that, The bottom wall of the cleaning tank (2) and the plane containing the bottom wall of the inner cavity (10) form a first angle (3).

4. The self-cleaning rotary hook according to claim 2, characterized in that, The angle of the first included angle (3) is between 5° and 15°.

5. The self-cleaning rotary hook according to claim 1 or 4, characterized in that, The cleaning tank (2) is located at the junction of the bottom wall of the inner cavity (10) and the side wall of the inner cavity (10).

6. The self-cleaning rotary hook according to claim 4, characterized in that, The outer shuttle (1) has a first point (101) and a second point (102) in sequence in the direction of rotation. The depth of the first point (101) on the bottom wall of the cleaning tank (2) is greater than the depth of the second point (102) on the bottom wall of the cleaning tank (2).

7. The self-cleaning rotary hook according to claim 1 or 6, characterized in that, The opening (11) includes a first opening (111) and a second opening (112). The first opening (111) is located on the side wall at the tip (12) of the outer shuttle (1) and is connected to the inner cavity (10). The second opening (112) is located on the bottom wall of the inner cavity (10) and extends through the outer shuttle (1).

8. The self-cleaning rotary hook according to claim 7, characterized in that, The cleaning tank (2) includes a first cleaning tank area (21) and a second cleaning tank area (22). The bottom wall of the cleaning tank (2) in the first cleaning tank area (21) is connected to the inner cavity (10) near the second opening (112). The bottom wall of the cleaning tank (2) in the second cleaning tank area (22) is connected to the inner cavity (10) near the first opening (111).

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