Outer hook frame and rotary hook

Abstract

The present invention relates to the technical field of sewing machines, and provides an outer hook frame and a rotary hook. The outer hook frame comprises an outer hook main body, which is an integrally formed structure. A mounting cavity is provided in a middle portion of the outer hook main body. A guide groove and a mounting surface disposed on a top end surface of the guide groove are recessed from a side wall of the mounting cavity. At least one arc-shaped limiting member is detachably provided on the mounting surface, and the arc-shaped limiting member is used for limiting a guide rail of an inner hook frame within the guide groove. A dust discharge hole in communication with the guide groove is formed on a side wall of the outer hook main body. A thread pushing protrusion, a needle insertion slot located below the thread pushing protrusion, and a needle protection surface connected to the needle insertion slot are provided at a top edge of the outer hook main body. The needle insertion slot is used for insertion of a needle. In the present invention, the outer hook main body is an integrally formed structure and has good structural stability. The thread pushing protrusion is provided to push an upper thread outwards, thereby facilitating shedding of the upper thread. The needle protection surface is provided to limit and protect the needle. The dust discharge hole is provided to discharge dust in the guide groove and facilitate heat dissipation, thereby reducing the probability of the inner hook frame jamming within the outer hook main body.

Description

An outer shuttle frame and a rotary shuttle Technical Field

[0001] This invention relates to the field of sewing machine technology, and in particular to an outer shuttle frame and a rotary shuttle having the outer shuttle frame. Background Technology

[0002] The rotary hook is the heart of the sewing machine. It hooks the top thread on the sewing machine needle, rotates it, and then passes it around the bobbin in the inner shuttle frame to form a stitch. The 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 relative to the inner shuttle frame.

[0003] Among existing patents, Chinese patent document with application number 202022807768.3 discloses an outer shuttle frame, including an outer shuttle body and a pressure plate locked to the outer side wall of the outer shuttle body. Technical issues

[0004] However, existing patent 202022807768.3 suffers from problems due to processing or assembly errors between the pressing plate and the outer shuttle body. This leads to uneven or excessive locking force during pressing, causing deformation of the outer shuttle body's sidewalls and dust accumulation in the guide groove, which can cause the inner shuttle frame to jam. Therefore, the defects are obvious, and a solution is urgently needed.

[0005] To address the aforementioned problems of sidewall deformation of the outer shuttle body and dust accumulation in the guide groove causing the inner shuttle frame to jam, the primary objective of this invention is to provide an outer shuttle frame with an integral structure for the outer shuttle body, exhibiting good structural stability. A push-thread protrusion is provided to push the thread outwards, facilitating thread unwinding. A needle guard is provided to limit and protect the needle. Dust discharge holes are provided to expel dust from the guide groove and promote heat dissipation, thereby reducing the probability of the inner shuttle frame jamming within the outer shuttle body.

[0006] Furthermore, a second objective of the present invention is to provide a rotary shuttle, including the aforementioned outer shuttle frame. Solution

[0007] To achieve the first objective of this invention, the present invention provides an outer shuttle frame, comprising an integrally constructed outer shuttle body. The outer shuttle body has a mounting cavity in its center for mounting an inner shuttle frame. The sidewall of the mounting cavity is recessed with a guide groove for accommodating the guide rail of the inner shuttle frame and a mounting surface disposed on the top surface of the guide groove. At least one arc-shaped limiting piece is detachably mounted on the mounting surface. The arc-shaped limiting piece is used to limit the guide rail of the inner shuttle frame within the guide groove. The sidewall of the outer shuttle body has at least one dust discharge hole communicating with the guide groove. The top edge of the outer shuttle body has a push-thread protrusion, a needle insertion groove located below the push-thread protrusion, and a needle protection surface connected to the needle insertion groove. The push-thread protrusion is used to push the thread outward, the needle insertion groove is used for inserting a needle, and the needle protection surface is used to abut and limit the side of the needle.

[0008] A preferred embodiment is that the bottom surface of the outer shuttle body is provided with heat dissipation holes, which are connected to the mounting cavity.

[0009] A further proposed solution is to have a mounting block coaxially protruding in the center of the bottom surface of the outer shuttle body, with heat dissipation holes offset from the mounting block, and a mounting hole coaxially provided in the center of the mounting block, with a shuttle shaft installed in the mounting hole. The sewing machine is used to drive the shuttle shaft to rotate so that the outer shuttle body rotates synchronously.

[0010] A further alternative is to equip the mounting block and / or the shuttle shaft with an impeller so that the impeller rotates synchronously with the mounting block and the shuttle shaft.

[0011] A further proposed solution is that the mounting block is cylindrical, and the impeller includes a contour sleeve fitted onto the mounting block and multiple blades disposed around the contour sleeve, the contour sleeve being cylindrical.

[0012] A further design involves a plurality of recessed positions on the periphery of the mounting block. The impeller includes a contoured sleeve fitted over the mounting block and a plurality of blades disposed on the periphery of the contoured sleeve. One blade is located in a recessed groove of the contoured sleeve. The plurality of recessed positions are arranged in a ring array on the periphery of the mounting block, with one recessed position corresponding to one recessed groove.

[0013] A further approach is to have multiple blades distributed at equal angles around the periphery of the conformal sleeve.

[0014] A further solution is to have a notch on the side wall of the outer shuttle body, a hook tip on one side of the notch, and a line-giving position recessed in the hook tip, which is located below the guide groove.

[0015] A further improvement is to provide a guide bevel at the tip of the line, with the bottom of the guide bevel connected to the line position via a rounded surface.

[0016] A further proposed solution is to have a sharp corner on the other side of the notch, with an inclined surface on the underside of the sharp corner.

[0017] A further improvement is that the inner wall of the guide channel is provided with a diamond-like thin film layer.

[0018] To achieve the second objective of the present invention, the present invention provides a rotary shuttle, including the outer shuttle frame as described above. Beneficial effects

[0019] In actual use, the inner shuttle is installed in the mounting cavity of the outer shuttle, and the guide rail of the inner shuttle is located in the guide groove of the outer shuttle. Then, the arc-shaped limiting piece is installed on the mounting surface of the outer shuttle by bolts, so that the arc-shaped limiting piece limits the guide rail of the inner shuttle in the guide groove, preventing the inner shuttle from detaching from the mounting cavity of the outer shuttle. When the inner shuttle and the outer shuttle body of the outer shuttle rotate relative to each other, the guide rail rotates along the guide groove. In this invention, the push-thread protrusion of the outer shuttle frame can push the top thread outward, facilitating the unwinding of the top thread. The needle guard of the outer shuttle frame abuts and limits the side of the needle to protect the needle, reducing the needle breakage rate. During the rotation of the guide rail in the guide groove of the outer shuttle frame, when there is lint, dust or other dust in the guide groove, the dust can be discharged outward from the dust discharge hole of the outer shuttle frame, ensuring that the inner shuttle frame can rotate smoothly and stably in the outer shuttle body of the outer shuttle frame, avoiding the problem of the inner shuttle frame jamming due to dust accumulating in the guide groove. The dust discharge hole also plays a certain role in heat dissipation. Furthermore, the outer shuttle body of the present invention is an integral structure with good structural stability. This avoids the problem in the prior art where the outer side wall of the outer shuttle body needs to be locked with a semi-enclosed pressure plate. During the locking and pressing process, uneven locking force or excessive locking force can easily cause the side wall of the outer shuttle body to be squeezed and deformed. In addition, the outer shuttle body of the present invention pushes the top thread outward by setting a push-thread protrusion, which facilitates the unwinding of the top thread. It also provides limit protection for the needle by setting a needle guard, and discharges dust from the guide groove by setting a dust discharge hole, which is conducive to heat dissipation and reduces the probability of the inner shuttle body getting stuck in the outer shuttle body. Attached Figure Description

[0020] Figure 1 is a three-dimensional structural diagram of an embodiment of the present invention after the shuttle shaft is hidden.

[0021] Figure 2 is an exploded structural diagram of an embodiment of the present invention with the shuttle shaft hidden.

[0022] Figure 3 is an exploded structural diagram from another perspective of an embodiment of the present invention with the shuttle shaft hidden.

[0023] Figure 4 is an exploded structural diagram of another embodiment of the present invention with the shuttle shaft hidden.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Outer shuttle body; 2. Mounting cavity; 3. Guide groove; 4. Mounting surface; 5. Arc-shaped limiting piece; 6. Dust discharge hole; 7. Push wire protrusion; 8. Pin insertion groove; 9. Pin protection surface; 10. Heat dissipation hole; 11. Mounting block; 12. Impeller; 13. Contouring sleeve; 14. Blade; 15. Recessed position; 16. Recessed groove; 17. Notch; 18. Thread hook tip; 19. Thread release position; 20. Guide slope; 21. Sharp corner; 22. Inclined surface; 23. Mounting hole.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. Embodiments of the present invention

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0028] As shown in Figures 1 to 4, the present invention provides an outer shuttle frame, which includes an integrally constructed outer shuttle body 1. The outer shuttle body 1 has a mounting cavity 2 for mounting an inner shuttle frame in its middle. The side wall of the mounting cavity 2 is recessed with a guide groove 3 for accommodating the guide rail of the inner shuttle frame and a mounting surface 4 disposed on the top surface of the guide groove 3. At least one arc-shaped limiting piece 5 is detachably mounted on the mounting surface 4. The arc-shaped limiting piece 5 is used to limit the guide rail of the inner shuttle frame in the guide groove 3. The side wall of the outer shuttle body 1 has at least one dust discharge hole 6 communicating with the guide groove 3. The top edge of the outer shuttle body 1 is provided with a thread pushing protrusion 7, a needle insertion groove 8 located below the thread pushing protrusion 7, and a needle protection surface 9 connected to the needle insertion groove 8. The thread pushing protrusion 7 is used to push the thread outward, the needle insertion groove 8 is used for inserting the needle, and the needle protection surface 9 is used to abut and limit the side of the sewing machine needle. Preferably, the guide groove 3 is arc-shaped; there are two arc-shaped limiting pieces 5, which are distributed along the arc of the guide groove 3; there are multiple dust discharge holes 6, which are distributed at equal intervals along the circumference of the guide groove 3.

[0029] In actual use, the inner shuttle is installed in the mounting cavity 2, and the guide rail of the inner shuttle is located in the guide groove 3. Then, the arc-shaped limiting piece 5 is installed on the mounting surface 4 by bolts, so that the arc-shaped limiting piece 5 limits the guide rail of the inner shuttle in the guide groove 3, preventing the inner shuttle from coming out of the mounting cavity 2. When the inner shuttle rotates relative to the outer shuttle body 1, the guide rail of the inner shuttle rotates along the guide groove 3. Among them, the push thread protrusion 7 can push the top thread outward, which facilitates the unwinding of the top thread. The needle protection surface 9 abuts and limits the side of the needle to achieve the function of protecting the needle and reducing the needle breakage rate. During the rotation of the guide rail of the inner shuttle in the guide groove 3, when there is lint, dust or other dust in the guide groove 3, the dust can be discharged outward from the dust discharge hole 6, ensuring that the inner shuttle can rotate smoothly and stably in the outer shuttle body 1, avoiding the problem of the inner shuttle jamming due to dust accumulating in the guide groove 3, and the dust discharge hole 6 also plays a certain role in heat dissipation. The outer shuttle body 1 of the present invention has an integral structure, which makes the structure of the outer shuttle body 1 have good structural stability, facilitates manufacturing, improves processing accuracy, and avoids the problem that the outer side wall of the outer shuttle body of the prior art needs to be locked with a semi-enclosed pressing plate. During the locking pressing, the side wall of the outer shuttle body 1 is easily squeezed and deformed due to uneven locking force or excessive locking force. In addition, by setting the push-line protrusion 7, the top thread is pushed outward, which facilitates the unwinding of the top thread. The needle protection surface 9 is set to limit and protect the needle. The dust discharge hole 6 is set to discharge the dust in the guide groove 3 and facilitate heat dissipation, reducing the probability of the inner shuttle frame getting stuck in the outer shuttle body 1.

[0030] In this embodiment, a heat dissipation hole 10 is provided on the bottom surface of the outer shuttle body 1, and the heat dissipation hole 10 is connected to the mounting cavity 2. The provision of the heat dissipation hole 10 in this embodiment is beneficial for heat dissipation and for expelling dust from the outer shuttle body 1.

[0031] In this embodiment, a mounting block 11 is coaxially protruding from the center of the bottom surface of the outer shuttle body 1, and the heat dissipation hole 10 is offset from the mounting block 11; a mounting hole 23 is coaxially provided in the center of the mounting block 11, and the mounting hole 23 is fitted with a shuttle shaft. The sewing machine drives the shuttle shaft to rotate, and the rotating shuttle shaft drives the outer shuttle body 1 to rotate synchronously. This structural design facilitates the disassembly, assembly, and maintenance of the shuttle shaft and the outer shuttle body 1.

[0032] In this embodiment, the mounting block 11 and / or the shuttle shaft are equipped with an impeller 12. Depending on actual needs, the impeller 12 can be mounted on either the mounting block 11 or the shuttle shaft; alternatively, it can be mounted on both. In actual use, the impeller 12 rotates synchronously with the mounting block 11 and the shuttle shaft. The rotating impeller 12 generates airflow, which is blown into the mounting cavity 2 of the outer shuttle body 1 through the heat dissipation holes 10 and onto the outer surface of the outer shuttle body 1. This not only achieves rapid air cooling and heat dissipation but also blows away dust inside the outer shuttle body 1. This invention continuously drives the impeller 12 to rotate for air cooling, which, compared to the oil cooling used in the prior art, not only saves resources and reduces operating costs but also avoids the problem of oil contamination of the sewn fabric.

[0033] As shown in Figure 4, in this embodiment, the mounting block 11 is cylindrical, and the impeller 12 includes a contour sleeve 13 fitted onto the mounting block 11 and multiple blades 14 arranged at equal angles around the contour sleeve 13. The mounting block 11 and impeller 12 have a simple structure and are easy to manufacture.

[0034] As shown in Figure 3, in another embodiment, the mounting block 11 has multiple recessed positions 15 on its periphery. The mounting block 11 is roughly clover-shaped. The impeller 12 includes a contoured sleeve 13 fitted over the mounting block 11 and multiple blades 14 disposed on the periphery of the contoured sleeve 13. Each blade 14 is located within a recessed groove 16 of the contoured sleeve 13. Specifically, the multiple recessed positions 15 are arranged in a ring array on the periphery of the mounting block 11. This structural design, due to the setting of the recessed positions 15, also results in recessed grooves 16 on the contoured sleeve 13 of the impeller 12. The blades 14 are located within the recessed grooves 16, which helps to increase the area of ​​the blades 14, thereby increasing the airflow generated by the blades 14 and improving the efficiency of air cooling and heat dissipation.

[0035] In this embodiment, the side wall of the outer shuttle body 1 is provided with a notch 17, and a hook tip 18 is provided on one side of the notch 17. The hook tip 18 is recessed with a thread-receiving position 19, which is located below the guide groove 3. During the relative rotation of the inner shuttle frame and the outer shuttle body 1, the guide rail of the inner shuttle frame rotates relative to the guide groove 3 of the outer shuttle body 1. The hook tip 18 of the outer shuttle body 1 hooks the top thread, and the top thread moves along the hook tip 18 to the thread-receiving position 19. The thread-receiving position 19 provides space for the top thread to avoid obstruction, so that the top thread is restricted at the thread-receiving position 19. Since the thread-receiving position 19 is located below the guide groove 3, the top thread is not easy to enter the guide groove 3. On the one hand, it is not easy for the thread to get stuck, and on the other hand, it is easy for the top thread to move to the bottom surface of the inner shuttle frame, thereby facilitating thread unwinding.

[0036] In this embodiment, the hook tip 18 is provided with a guide slope 20, and the bottom end of the guide slope 20 is connected to the yielding position 19 via an arc surface. The guide slope 20 is used to guide the top line hooked by the hook tip 18 to the yielding position 19, and plays a guiding role for the top line, which is conducive to the movement of the hooked top line to the yielding position 19.

[0037] In this embodiment, a pointed corner 21 is provided on the other side of the notch 17, and an inclined surface 22 is provided on the lower side of the pointed corner 21. This structural design can slow down the rapid retraction of the thread when it comes loose, thus preventing the sewn fabric from wrinkling.

[0038] Specifically, a diamond-like film layer is provided inside the guide groove 3 to form a wear-resistant coating, which improves the wear resistance of the guide groove 3 and can improve the surface finish of the inner wall of the guide groove 3 to a certain extent.

[0039] The present invention also provides a rotary shuttle, including the aforementioned outer shuttle frame. This rotary shuttle possesses all the beneficial effects of the outer shuttle frame, which will not be elaborated further here.

[0040] All technical features in this embodiment can be freely combined according to actual needs.

[0041] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention. Industrial application

[0042] The outer shuttle body of the present invention has an integral structure with good structural stability. The outer shuttle body of the present invention pushes the top thread outward by setting a thread pusher protrusion, which facilitates the unwinding of the top thread. The needle guard is set to limit and protect the needle. The dust discharge hole is set to discharge the dust in the guide groove and facilitate heat dissipation, which reduces the probability of the inner shuttle body getting stuck in the outer shuttle body. It can be widely used in sewing machines.

[0043] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. An outer shuttle frame, characterized in that: The device includes an outer shuttle body (1) with an integral structure. The middle part of the outer shuttle body (1) is provided with a mounting cavity (2) for mounting an inner shuttle frame. The side wall of the mounting cavity (2) is recessed with a guide groove (3) for accommodating the guide rail of the inner shuttle frame and a mounting surface (4) provided on the top surface of the guide groove (3). At least one arc-shaped limiting piece (5) is detachably mounted on the mounting surface (4). The arc-shaped limiting piece (5) is used to limit the guide rail of the inner shuttle frame in the guide groove (3). The outer shuttle body (1) has at least one dust discharge hole (6) that communicates with the guide groove (3) on its side wall. The top edge of the outer shuttle body (1) is provided with a push-wire protrusion (7), a needle insertion groove (8) located below the push-wire protrusion (7), and a needle protection surface (9) connected to the needle insertion groove (8). The push-wire protrusion (7) is used to push the surface thread outward. The needle insertion groove (8) is used for inserting the needle. The needle protection surface (9) is used to abut and limit the side of the needle.

2. An outer shuttle frame according to claim 1, characterized in that: The bottom surface of the outer shuttle body (1) is provided with heat dissipation holes (10), and the heat dissipation holes (10) are connected to the mounting cavity (2).

3. An outer shuttle frame according to claim 2, characterized in that: The outer shuttle body (1) has a mounting block (11) coaxially protruding in the middle of its bottom surface, and the heat dissipation hole (10) is offset from the mounting block (11); The mounting block (11) is coaxially provided with a mounting hole (23) in the middle, and a shuttle shaft is installed in the mounting hole (23). The sewing machine is used to drive the shuttle shaft to rotate so as to drive the outer shuttle body (1) to rotate synchronously.

4. An outer shuttle frame according to claim 3, characterized in that: The mounting block (11) and / or the shuttle shaft are equipped with an impeller (12) such that the impeller (12) rotates synchronously with the mounting block (11) and the shuttle shaft.

5. An outer shuttle frame according to claim 4, characterized in that: The mounting block (11) is cylindrical, and the impeller (12) includes a contour sleeve (13) fitted onto the mounting block (11) and multiple blades (14) disposed on the periphery of the contour sleeve (13). The contour sleeve (13) is cylindrical.

6. An outer shuttle frame according to claim 4, characterized in that: The mounting block (11) has a plurality of recessed positions (15) on its periphery. The impeller (12) includes a contoured sleeve (13) fitted outside the mounting block (11) and a plurality of blades (14) disposed on the periphery of the contoured sleeve (13). One of the blades (14) is located in a recessed groove (16) of the contoured sleeve (13). Multiple recessed positions (15) are arranged in a ring array on the periphery of the mounting block (11), and one recessed position (15) is correspondingly provided with one recessed groove (16).

7. An outer shuttle frame according to claim 5 or 6, characterized in that: Multiple blades (14) are distributed at equal angles around the periphery of the conformal sleeve (13).

8. An outer shuttle frame according to any one of claims 1 to 7, characterized in that: The side wall of the outer shuttle body (1) is provided with a notch (17), and a hook tip (18) is provided on one side of the notch (17). The hook tip (18) is recessed with a line-giving position (19), which is located below the guide groove (3).

9. An outer shuttle frame according to claim 8, characterized in that: The hook tip (18) is provided with a guide slope (20), and the bottom end of the guide slope (20) is connected to the line position (19) via an arc surface.

10. An outer shuttle frame according to claim 8 or 9, characterized in that: A pointed corner (21) is provided on the other side of the notch (17), and an inclined surface (22) is provided on the lower side of the pointed corner (21).

11. An outer shuttle frame according to any one of claims 1 to 10, characterized in that: The inner wall of the guide groove (3) is provided with a diamond-like film layer.

12. A rotary shuttle, characterized in that: Includes the outer shuttle frame as described in any one of claims 1 to 11 above.

Images