Outer shuttle frame and rotating shuttle

Abstract

The utility model relates to the technical field of sewing machines, in particular to an outer shuttle frame and a rotating shuttle, which comprise an outer shuttle main body with an integral structure, a mounting cavity arranged in the middle of the outer shuttle main body, a guide groove concavely arranged on the side wall of the mounting cavity and a mounting surface arranged on the top end surface of the guide groove, and at least one arc-shaped limiting piece detachably arranged on the mounting surface. The arc-shaped limiting piece is used for limiting the guide rail of the inner shuttle frame in the guide groove, the side wall of the outer shuttle body is provided with at least one dust discharging hole communicated with the guide groove, the top edge of the outer shuttle body is provided with a thread pushing protrusion, a needle inserting groove located below the thread pushing protrusion and a needle protecting face connected with the needle inserting groove, and the needle inserting groove is used for insertion of a machine needle. The outer shuttle body is of an integrated structure, the structural stability is good, the upper threads are pushed outwards through the thread pushing protrusions, the upper threads are convenient to loosen, the needle protection faces are arranged for limiting and protecting the machine needles, dust in the guide grooves is discharged through the dust discharging holes, heat dissipation is facilitated, and the fault probability that the inner shuttle frame is clamped in the outer shuttle body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to an outer shuttle frame and a rotary shuttle. Background Art

[0002] The rotary hook is the heart of the sewing machine. The rotary hook is used to hook the upper thread on the sewing machine needle and rotate it, then it passes over the bottom line in the bobbin of the inner shuttle frame of the rotary hook to form a stitch. The rotary hook is composed of an outer shuttle frame and an inner shuttle frame. The outer shuttle frame and the inner shuttle frame cooperate with each other through the guide groove in the outer shuttle frame and the guide rail on the inner shuttle frame. When working, the outer shuttle frame rotates on the inner shuttle frame. Among the existing patents, the Chinese patent document with application number 202022807768.3 discloses an outer shuttle frame, including an outer shuttle body and a pressing piece locked on the outer side wall of the outer shuttle body. Since processing or assembly errors are easily generated between the pressing piece and the outer shuttle body, it is easy for the side wall of the outer shuttle body to be deformed due to uneven locking force or excessive locking force when locking the pressing piece, and it is easy for dust to be trapped in the guide groove, causing the inner shuttle frame to be stuck. Therefore, the defects are very obvious, and there is an urgent need to provide a solution. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present utility model is to provide an outer shuttle rack and a rotary hook.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The cam is secured to the upper edge of the machine needle and has a cam face that is adapted to engage with the guide rails of the machine needle and to engage with the guide rails of the machine needle when the machine needle is engaged.

[0006] Furthermore, a heat dissipation hole is provided on the bottom surface of the outer shuttle body, and the heat dissipation hole is communicated with the installation cavity.

[0007] Furthermore, a mounting block is coaxially provided on the middle of the bottom surface of the outer shuttle body, and the heat dissipation hole is staggered with the mounting block; a mounting hole is coaxially provided on the middle of the mounting block, and the shuttle shaft is installed in the mounting hole.

[0008] Furthermore, the mounting block and / or the shuttle shaft is equipped with an impeller.

[0009] Furthermore, the mounting block is cylindrical, and the impeller includes a contoured sleeve sleeved on the mounting block and a plurality of blades arranged on the circumference of the contoured sleeve.

[0010] Furthermore, the circumference of the mounting block is concavely provided with a plurality of recessed positions, and the impeller comprises a contoured sleeve sleeved outside the mounting block and a plurality of blades arranged on the circumference of the contoured sleeve, and each blade is located in a recessed groove of the contoured sleeve.

[0011] Furthermore, a notch is provided on the side wall of the outer shuttle body, a thread hooking tip is provided on one side of the notch, and a thread giving position is concavely provided in the thread hooking tip, and the thread giving position is located below the guide groove.

[0012] Furthermore, the line hooking tip is provided with a guiding slope, and the bottom end of the guiding slope is transitionally connected to the line letting position via an arc surface.

[0013] Furthermore, a sharp corner portion is provided on the other side of the notch, and an inclined surface is provided on the lower side of the sharp corner portion.

[0014] The utility model also provides a rotary hook, which comprises the outer hook frame mentioned above.

[0015] The beneficial effects of the present invention are as follows: in actual use, the inner shuttle frame is installed in the installation cavity, the guide rail of the inner shuttle frame is located in the guide groove, and the arc-shaped limit plate is installed on the installation surface by means of bolts, so that the arc-shaped limit plate limits the guide rail of the inner shuttle frame in the guide groove, and prevents the inner shuttle frame from detaching from the installation cavity. When the inner shuttle frame and the outer shuttle body rotate relative to each other, the guide rail rotates along the guide groove; wherein, the thread pushing protrusion can push the surface thread outward, which is convenient for the surface thread to be unthreaded; the needle guard faces the side of the machine needle for resistance and limitation, so as to achieve the function of needle protection and reduce the needle breakage rate; in the process of the guide rail rotating in the guide groove, when there is thread hair, dust and other dust in the guide groove, the dust can be discharged outward from the dust exhaust hole, ensuring that the inner shuttle frame can rotate smoothly and steadily in the outer shuttle body, avoiding the problem of the inner shuttle frame being stuck due to dust remaining in the guide groove, and the dust exhaust hole also plays a certain heat dissipation role. The outer shuttle body of the utility model is an integrated structure with good structural stability, which avoids the problem that the outer side wall of the outer shuttle body in the prior art needs to be locked with a semi-enclosed pressing piece, which is prone to the problem of squeezing and deformation of the side wall of the outer shuttle body due to uneven locking force or excessive locking force when locking the pressing piece. The surface thread is pushed outward by arranging a thread pushing protrusion, which facilitates the unthreading of the surface thread. The needle guard is provided to limit the needle, and the dust exhaust hole is provided to discharge the dust in the guide groove and facilitate heat dissipation, thereby reducing the probability of the inner shuttle frame being stuck in the outer shuttle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the present invention after the shuttle shaft is hidden.

[0017] Figure 2This is a schematic diagram of the exploded structure of an embodiment of the present invention after the shuttle shaft is hidden.

[0018] Figure 3 This is a schematic diagram of the exploded structure of an embodiment of the present invention from another perspective after the shuttle shaft is hidden.

[0019] Figure 4 This is a schematic diagram of the exploded structure of another embodiment of the present invention with the shuttle shaft hidden.

[0020] Description of reference numerals:

[0021] 1. Outer shuttle body; 2. Mounting cavity; 3. Guide groove; 4. Mounting surface; 5. Arc-shaped limit plate; 6. Dust discharge hole; 7. Thread push protrusion; 8. Pin insertion slot; 9. Pin protection surface; 10. Heat dissipation hole; 11. Mounting block; 12. Impeller; 13. Contoured sleeve; 14. Blade; 15. Recessed position; 16. Recessed groove; 17. Notch; 18. Thread hook tip; 19. Thread clearance position; 20. Guide slope; 21. Sharp corner; 22. Inclined surface; 23. Mounting hole. DETAILED DESCRIPTION

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0023] like Figures 1 to 4 As shown, the utility model provides an outer shuttle rack, which includes an outer shuttle body 1 of an integral structure, and a mounting cavity 2 for mounting an inner shuttle rack is provided in the middle of the outer shuttle body 1, and the side wall of the mounting cavity 2 is recessed with a guide groove 3 for accommodating the guide rail of the inner shuttle rack and a mounting surface 4 arranged on the top surface of the guide groove 3, and the mounting surface 4 is detachably provided with at least one arc-shaped limit plate 5, which is used to limit the guide rail of the inner shuttle rack in the guide groove 3, and the side wall of the outer shuttle body 1 is provided with at least one dust exhaust hole 6 connected with the guide groove 3, and the top edge of the outer shuttle body 1 is provided with a thread pushing protrusion 7, a needle insertion groove 8 below the thread pushing protrusion 7 and a needle guard surface 9 connected with the needle insertion groove 8, the thread pushing protrusion 7 is used to push the upper thread outward, the needle insertion groove 8 is used for inserting the machine needle, and the needle guard surface 9 is used to interfere with and limit the side of the needle of the sewing machine. Preferably, the guide groove 3 is arc-shaped; there are two arc-shaped limit plates 5, which are distributed along the arc of the guide groove 3; there are multiple dust exhaust holes 6, which are distributed at equal intervals along the guide groove 3.

[0024] When the cam 1 is in the upright position, the guide rail 3 of the inner shuttle frame is fixed on the guide groove 3, and the guide rail 3 of the inner shuttle frame is fixed on the guide groove 3. When the cam 1 is in the upright position, the guide rail 3 of the inner shuttle frame is fixed on the guide groove 3, and the guide rail 3 of the inner shuttle frame is fixed on the guide groove 3. When the cam 1 is in the upright position, the guide rail 3 of the inner shuttle frame is fixed on the guide groove 3, and the guide groove 3 of the outer shuttle frame is fixed on the guide groove 3. The outer shuttle body 1 of the present invention is an integrated structure. The outer shuttle body 1 has good structural stability, is easy to produce and manufacture, and has improved processing accuracy. It avoids the problem that the outer side wall of the outer shuttle body in the prior art needs to be locked with a semi-enclosed pressing piece, which is easy to cause the side wall of the outer shuttle body 1 to be squeezed and deformed due to uneven locking force or excessive locking force when locking the pressing piece. The surface thread is pushed outward by setting a thread pushing protrusion 7, which facilitates the dethreading of the surface thread. The needle guard surface 9 is set to limit the needle. The dust exhaust hole 6 is set to discharge the dust in the guide groove 3 and is conducive to heat dissipation, thereby reducing the probability of the inner shuttle frame being stuck in the outer shuttle body 1.

[0025] In this embodiment, the bottom surface of the outer shuttle body 1 is provided with a heat dissipation hole 10, which is connected to the installation cavity 2. The provision of the heat dissipation hole 10 is conducive to heat dissipation and the discharge of dust in the outer shuttle body 1.

[0026] In this embodiment, a mounting block 11 is coaxially protruded from the center of the bottom surface of the outer shuttle body 1. 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 shuttle shaft is mounted in this hole. The sewing machine drives the shuttle shaft to rotate, which in turn drives the outer shuttle body 1 to rotate synchronously. This structural design facilitates assembly and disassembly of the shuttle shaft and outer shuttle body 1, as well as maintenance.

[0027] 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; of course, it is also possible to mount the impeller 12 on both the mounting block 11 and the shuttle shaft. During use, the impeller 12 rotates synchronously with the mounting block 11 and the shuttle shaft. This rotation generates airflow, which is blown into the mounting cavity 2 of the outer shuttle body 1 and onto the outer surface of the outer shuttle body 1 through the heat dissipation holes 10. This airflow not only achieves rapid air cooling and heat dissipation, but also removes dust from the outer shuttle body 1. This utility model utilizes continuous air cooling during use. Compared to the prior art, which uses oil cooling, this not only saves resources and reduces operating costs, but also avoids the problem of oil contamination of sewn fabric.

[0028] like Figure 4 As shown, in this embodiment, the mounting block 11 is cylindrical, and the impeller 12 includes a contoured sleeve 13 that fits over the mounting block 11 and a plurality of blades 14 that are equiangularly arranged around the contoured sleeve 13. This structure of the mounting block 11 and impeller 12 is simple in structure and easy to manufacture.

[0029] like Figure 3 As shown, in another embodiment, a plurality of recessed positions 15 are concavely formed around the circumference of the mounting block 11. The mounting block 11 is roughly clover-shaped. The impeller 12 includes a contoured sleeve 13 that fits over the mounting block 11 and a plurality of blades 14 disposed around the circumference of the contoured sleeve 13. Each blade 14 is positioned within a recessed groove 16 of the contoured sleeve 13. Specifically, the plurality of recessed positions 15 are distributed in an annular array around the circumference of the mounting block 11. This structural design, due to the provision of recessed positions 15, also provides recessed grooves 16 on the contoured sleeve 13 of the impeller 12. The blades 14 are positioned within the recessed grooves 16, which helps increase the area of ​​the blades 14, thereby increasing the air volume generated by the blades 14 and improving the efficiency of air cooling and heat dissipation.

[0030] In this embodiment, a notch 17 is provided on the side wall of the outer shuttle body 1. A thread hooking tip 18 is provided on one side of the notch 17. The thread hooking tip 18 is recessed with a thread-yielding 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 relatively within the guide groove 3 of the outer shuttle body 1. The thread hooking tip 18 of the outer shuttle body 1 hooks the upper thread, and the upper thread moves along the thread hooking tip 18 to the thread-yielding position 19. The thread-yielding position 19 provides space for the upper thread to escape, so that the upper thread is confined to the thread-yielding position 19. Since the thread-yielding position 19 is located below the guide groove 3, the upper thread is not easily entered into the guide groove 3. On the one hand, this reduces the risk of thread jamming. On the other hand, it facilitates the upper thread to move to the bottom surface of the inner shuttle frame, thereby facilitating thread unthreading.

[0031] In this embodiment, the thread hooking tip 18 is provided with a guide slope 20, the bottom end of which is connected to the thread-yielding position 19 via an arc surface. The guide slope 20 is used to guide the upper thread hooked by the thread hooking tip 18 to the thread-yielding position 19, thereby guiding the upper thread and facilitating its movement to the thread-yielding position 19.

[0032] In this embodiment, a sharp corner portion 21 is provided on the other side of the notch 17, and an inclined surface 22 is provided on the lower side of the sharp corner portion 21. This structural design can slow down the rapid retraction of the thread when the thread is off, thereby preventing the sewn fabric from wrinkling.

[0033] Specifically, a diamond-like carbon film layer is provided in the guide groove 3 to form a wear-resistant coating, thereby improving the wear resistance of the guide groove 3 and improving the surface finish of the inner side wall of the guide groove 3 to a certain extent.

[0034] The utility model also provides a rotary hook, comprising the above-mentioned outer hook frame. The rotary hook has all the beneficial effects of the outer hook frame, which will not be described in detail here.

[0035] All technical features in this embodiment can be freely combined according to actual needs.

[0036] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. An outer shuttle rack, characterized in that: The invention comprises an outer shuttle body (1) of an integral structure, wherein a mounting cavity (2) for mounting an inner shuttle frame is provided in the middle of the outer shuttle body (1), a guide groove (3) for accommodating a guide rail of the inner shuttle frame and a mounting surface (4) provided on the top surface of the guide groove (3), and the mounting surface (4) is detachably provided with at least one arc-shaped limiting piece (5), and 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) is provided with at least one dust discharge hole (6) in communication with the guide groove (3) on the side wall thereof. 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 with the needle insertion groove (8) on the top edge thereof. The thread pushing protrusion (7) is used for pushing the needle thread outward, the needle insertion groove (8) is used for inserting the needle, and the needle protection surface (9) is used for resisting and limiting the side surface of the needle.

2. The outer shuttle rack according to claim 1, characterized in that: The bottom surface of the outer shuttle body (1) is provided with a heat dissipation hole (10), and the heat dissipation hole (10) is communicated with the installation cavity (2).

3. The outer shuttle rack according to claim 2, characterized in that: A mounting block (11) is coaxially protruded in the middle of the bottom surface of the outer shuttle body (1), and the heat dissipation hole (10) and the mounting block (11) are staggered. A mounting hole (23) is coaxially provided in the middle of the mounting block (11), and the mounting hole (23) is equipped with a shuttle shaft.

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

5. The outer shuttle rack according to claim 4, characterized in that: The mounting block (11) is cylindrical, and the impeller (12) comprises a profile sleeve (13) sleeved on the mounting block (11) and a plurality of blades (14) arranged on the circumference of the profile sleeve (13).

6. The outer shuttle rack according to claim 4, characterized in that: The mounting block (11) is provided with a plurality of recessed positions (15) on its circumferential side. The impeller (12) comprises a contoured sleeve (13) sleeved on the outside of the mounting block (11) and a plurality of blades (14) arranged on the circumferential side of the contoured sleeve (13). Each blade (14) is located in a recessed groove (16) of the contoured sleeve (13).

7. The outer shuttle rack according to claim 1, characterized in that: The side wall of the outer shuttle body (1) is provided with a notch (17), a thread hooking tip (18) is provided on one side of the notch (17), and a thread letting position (19) is recessed in the thread hooking tip (18), and the thread letting position (19) is located below the guide groove (3).

8. The outer shuttle rack according to claim 7, characterized in that: The line hooking tip (18) is provided with a guiding inclined surface (20), and the bottom end of the guiding inclined surface (20) is transitionally connected to the line-yielding position (19) via an arc surface.

9. The outer shuttle rack according to claim 7, characterized in that: A sharp corner portion (21) is provided on the other side of the notch (17), and an inclined surface (22) is provided on the lower side of the sharp corner portion (21).

10. A rotary hook, characterized in that: Comprising the outer shuttle holder according to any one of claims 1 to 9.

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