Rotating shuttle structure of sewing machine

Abstract

The utility model relates to a rotating shuttle structure of a sewing machine and belongs to the technical field of rotating shuttles. The rotating shuttle structure of the sewing machine comprises a shuttle race, a shuttle frame and an inner shuttle pressing plate, a mounting ring groove for mounting the shuttle frame is formed in the inner wall of the shuttle race, a covering part and an opening part are arranged on the portions, on the two opposite sides of the mounting ring groove, of the shuttle race respectively, the covering part is provided with a limiting ring face corresponding to the inner wall of the shuttle race, and the opening part is provided with a limiting ring face corresponding to the inner wall of the shuttle race. The inner diameter of the limiting ring face is larger than that of the inner wall of the shuttle race, and guide inclined faces are arranged on the two sides of the limiting ring face in the axis direction. The thread hooking device has the advantages that the thread passing smoothness is improved, and the thread hooking efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of rotary hooks, and in particular to a rotary hook structure for a sewing machine. Background Art

[0002] The rotary hook is a key component in a sewing machine, used to guide the stitches. Its rotation, combined with the up-and-down motion of the needle bar, pulls the thread through the fabric, creating a continuous stitch.

[0003] Conventional rotary hooks typically consist of a shuttle bed, a shuttle frame, an inner shuttle pressure plate, and a shuttle housing. The inner wall of the shuttle bed has a mounting groove for the shuttle frame to rotatably mount. The shuttle bed has a cover and an opening on either side of the mounting groove. The inner shuttle pressure plate is fixed to the opening of the mounting groove, cooperating with the cover to position the shuttle frame within the shuttle bed.

[0004] With respect to the above-mentioned related technologies, the inner diameter of the existing covering portion is consistent with the inner diameter of the shuttle bed, so that the space between the shuttle frame and the covering portion is small, which affects the smoothness of the thread pulling when the rotary hook is working. Utility Model Content

[0005] In order to improve the smoothness of the rotary hook when passing the thread, the present application provides a rotary hook structure for a sewing machine.

[0006] The present application provides a sewing machine hook structure adopting the following technical solutions:

[0007] A sewing machine hook structure includes a shuttle bed, a shuttle rack and an inner shuttle pressure plate. The inner wall of the shuttle bed has a mounting ring groove for mounting the shuttle rack. The shuttle bed is provided with a covering portion and an opening portion on opposite sides of the mounting ring groove. The covering portion has a limiting annular surface corresponding to the inner wall of the shuttle bed. The inner diameter of the limiting annular surface is larger than the inner diameter of the inner wall of the shuttle bed, and the limiting annular surface is provided with guide inclined surfaces on both sides of the axial direction.

[0008] By adopting the above technical solution, the inner diameter of the limiting ring is larger than the inner diameter of the shuttle bed, so that the aperture at the covering part is larger than the inner hole of the shuttle bed, and guide inclined surfaces are provided on both sides of the limiting ring, so that the space between the shuttle frame and the limiting ring is increased, the smoothness of the line passing is improved, which is conducive to hooking the line and convenient for the installation of the shuttle frame.

[0009] Optionally, the guide bevel surface includes a guide bevel plane close to the inner bottom of the shuttle bed and a guide bevel arc surface facing the side of the shuttle bed opening.

[0010] By adopting the above technical solution, the composition of the guide bevel surface, the setting of the guide bevel plane and the guide bevel arc surface are specifically disclosed, the distance between the shuttle frame and the limiting ring surface is increased, the smoothness of the line passing is improved, and the installation and disassembly of the shuttle frame is facilitated.

[0011] Optionally, the inner shuttle pressure plate is fixed to the opening portion, a plurality of locking through holes are circumferentially opened on the side wall of the inner shuttle pressure plate, the shuttle bed has locking screw holes corresponding one to one to the locking through holes, and locking pieces are threadedly connected to the locking screw holes.

[0012] By adopting the above technical solution, the inner shuttle pressure plate is arranged at the opening portion, corresponding to the covering portion, and plays a limiting covering role on the shuttle rack on one side of the opening portion. The inner shuttle pressure plate and the shuttle bed are fixed by the cooperation of the locking piece and the locking screw hole. The locking method is simple and the assembly is convenient.

[0013] Optionally, the opening portion is provided with a positioning assembly for positioning the shuttle rack, the side wall of the shuttle rack is provided with a positioning hole that cooperates with the positioning assembly, and the inner shuttle pressure plate is provided with a driving member that drives the positioning assembly to disengage from the positioning hole.

[0014] By adopting the above technical solution, the cooperation between the positioning component and the positioning hole can achieve a positioning effect on the shuttle rack, reducing the probability of the shuttle rack detaching from the shuttle bed before the inner shuttle pressure plate is installed. After the inner shuttle pressure plate and the shuttle bed are fixed, the cooperation between the positioning component and the positioning hole is released through the driving member, so that the shuttle rack and the shuttle bed can resume rotational cooperation.

[0015] Optionally, the positioning assembly includes a positioning shell, an elastic member arranged in the positioning shell, and a positioning block connected to the end of the elastic member. The positioning block and the positioning hole are plugged into each other. When the connecting elastic member is in a normal state, the positioning block protrudes from the side wall of the mounting ring groove.

[0016] By adopting the above technical solution, the structural composition of the positioning assembly is disclosed. The shuttle rack is inserted obliquely from one side of the opening, and one side of the shuttle rack is inserted into the mounting ring groove corresponding to the covering part. Then the shuttle rack is pressed downward, and the positioning block moves toward the connecting shell under the squeezing of the shuttle rack. After the shuttle rack and the mounting ring groove are matched, the shuttle rack is rotated, and the positioning hole and the positioning block correspond to each other to achieve positioning locking.

[0017] Optionally, a first guide surface is provided at the opening of the positioning block facing the shuttle bed.

[0018] By adopting the above technical solution and setting the first guide surface, when the shuttle rack is inserted into the shuttle bed, the bottom of the shuttle rack abuts against the first guide surface, which facilitates the positioning block to enter the connecting shell and saves effort.

[0019] Optionally, the shuttle bed is provided with an installation cavity for installing the positioning housing, and the positioning housing is provided with a fixing elastic member connected to a side wall of the installation cavity on a side away from the positioning block.

[0020] By adopting the above technical solution, the positioning shell is arranged in the installation chamber and is connected to the side wall of the installation chamber through a fixed elastic member, that is, there is sliding space in the radial direction of the positioning shell. Under the action of the driving member, the positioning shell moves in the direction away from the positioning block, thereby causing the positioning block to disengage from the positioning hole.

[0021] Optionally, the installation chamber has an open through-slot that passes through the end surface of the opening portion, and the driving member is inserted into the open through-slot and drives the positioning assembly to move radially.

[0022] By adopting the above technical solution, the driving member is axially inserted into the open slot, the open slot and the installation chamber are connected, and the radial sliding of the positioning assembly is realized through the driving member. The structure is simple and the operation is convenient, and at the same time, it has a positioning effect on the connection between the inner shuttle pressure plate and the shuttle bed.

[0023] Optionally, the positioning housing has a pushing portion corresponding to the open through slot, and the pushing portion has an abutting inclined surface for the driving member to abut.

[0024] By adopting the above technical solution, a matching mode of the driving member and the positioning housing is disclosed. The driving member is axially inserted and abuts against the abutment inclined surface, converting the axial force into radial force, and driving the positioning housing to move toward the bottom wall of the installation chamber.

[0025] Optionally, the side wall of the driving member is provided with elastic barbs, and the inner wall of the opening slot has a ratchet groove that cooperates with the elastic barbs.

[0026] By adopting the above technical solution, the cooperation of the elastic barb and the ratchet groove reduces the probability of axial movement of the inner shuttle pressure plate under the action of the fixed elastic member after the driving member disengages the positioning block from the positioning hole, thereby facilitating the cooperation between the locking member and the locking screw hole.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. This application makes the installation of the shuttle rack more convenient by setting the inner diameter of the limiting ring surface and the guide inclined surfaces on both sides of the limiting ring surface;

[0029] 2. The present invention provides a positioning assembly to position the shuttle rack, thereby reducing the probability of the shuttle rack being detached from the shuttle bed before the inner shuttle pressure plate is installed. The positioning assembly is then detached from the positioning hole by a driving member.

[0030] 3. The present application uses the cooperation of the elastic barbs and the ratchet grooves to reduce the probability of the inner shuttle pressure plate moving axially under the action of the fixed elastic member after the driving member disengages the positioning block from the positioning hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a schematic diagram of the explosion structure of an embodiment of the present application.

[0032] Figure 2 It is an overall cross-sectional schematic diagram of an embodiment of the present application.

[0033] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A in the middle.

[0034] Figure 4 This is a cross-sectional view of the embodiment of the present application when the driving member is not inserted.

[0035] Figure 5 yes Figure 4 A partial enlarged schematic diagram of point B in the middle.

[0036] Explanation of the accompanying reference numerals: 1. shuttle bed; 11. mounting ring groove; 12. covering portion; 121. limiting ring surface; 122. guide bevel plane; 123. guide bevel arc surface; 13. opening portion; 14. locking screw hole; 141. locking member; 15. positioning assembly; 151. positioning shell; 152. connecting elastic member; 153. positioning block; 1531. first guide surface; 154. pushing portion; 1541. abutting inclined surface; 16. mounting chamber; 161. fixing elastic member; 162. opening through groove; 1621. ratchet groove; 2. shuttle rack; 21. rotating ring; 211. positioning hole; 3. inner shuttle pressure plate; 31. abutting portion; 32. fitting portion; 321. locking through hole; 33. driving member; 331. elastic barb. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a rotary hook structure for a sewing machine.

[0039] Reference Figure 1 A sewing machine rotary hook structure includes a shuttle bed 1, a shuttle frame 2, and an inner shuttle pressure plate 3. The inner wall of the shuttle bed 1 has a mounting annular groove 11. The outer wall of the shuttle frame 2 has a rotating ring 21 that cooperates with the mounting annular groove 11. The shuttle bed 1 is provided with a covering portion 12 and an opening portion 13 on opposite sides of the mounting annular groove 11. The arcs of the covering portion 12 and the opening portion 13 are both less than 180 degrees. The covering portion 12 covers the mounting annular groove 11, and the mounting annular groove 11 at the opening portion 13 is directly connected to the outside in the axial direction of the shuttle bed 1.

[0040] Combine Figure 2 and Figure 3The cover 12 and shuttle bed 1 are integrally formed. The cover 12 has a retaining ring surface 121 on the side closest to the center axis of the shuttle bed 1. The inner diameter of the retaining ring surface 121 is larger than the inner diameter of the inner wall of the shuttle bed 1. The cover 12 also has inclined guide surfaces on both sides of the retaining ring surface 121 in the axial direction. The guide surfaces are located near the bottom of the shuttle bed 1 and are formed as curved guide surfaces 123 near the opening of the shuttle bed 1. Both the guide plane 122 and the curved guide surface 123 have an inclination angle of 45°.

[0041] The inner shuttle pressure plate 3 is positioned within the opening 13, covering the mounting groove 11 within the opening 13. The inner shuttle pressure plate 3 corresponds to the covering portion 12, thereby restraining the shuttle rack 2 within the shuttle bed 1. The inner shuttle pressure plate 3 is an overall curved plate, comprising an abutment portion 31 that abuts the open end surface of the shuttle bed 1 and an abutment portion 32 that abuts the outer wall of the shuttle bed 1.

[0042] The abutment portion 32 is provided with a plurality of locking through-holes 321 spaced circumferentially along the axis. The shuttle bed 1 has locking screw holes 14 corresponding one-to-one with the locking through-holes 321, and locking members 141 are disposed in these locking screw holes 14. The locking members 141 pass through the locking through-holes 321 and then threadably engage with the locking screw holes 14 to securely connect the shuttle bed 1 and the inner shuttle pressure plate 3. The locking members 141 are bolts.

[0043] Reference Figure 4 and Figure 5 A positioning assembly 15 for positioning the shuttle rack 2 is mounted on the inner sidewall of the opening 13 of the shuttle bed 1. A positioning hole 211 is formed on the sidewall of the rotating ring 21 to engage with the positioning assembly 15. The engagement between the positioning assembly 15 and the positioning hole 211 reduces the likelihood of the shuttle rack 2 detaching from the shuttle bed 1 after the shuttle rack 2 is installed and before the inner shuttle pressure plate 3 is installed. A driving member 33 is provided on the inner shuttle pressure plate 3 to engage with the positioning assembly 15. The driving member 33 releases the positioning assembly 15 from the positioning hole 211, restoring the rotational engagement between the shuttle rack 2 and the shuttle bed 1.

[0044] The positioning assembly 15 comprises a positioning housing 151, a connecting elastic member 152 fixed to the inner bottom wall of the positioning housing 151, and a positioning block 153 fixed to the other end of the connecting elastic member 152. The internal volume of the positioning housing 151 is larger than the positioning block 153, which is slidably mounted on the positioning housing 151 via the connecting elastic member 152. The connecting elastic member 152 is a compression spring, and when the connecting elastic member 152 is in its normal state, the positioning block 153 protrudes entirely from the opening of the positioning housing 151.

[0045] The positioning hole 211 and the positioning block 153 are matched in size, and the positioning block 153 is provided with a first guide surface 1531 on the opening side facing the shuttle bed 1, so as to facilitate the shuttle frame 2 to squeeze the positioning block 153 into the connecting housing.

[0046] The shuttle shuttle 1 has a mounting chamber 16 for mounting a positioning housing 151. The radial depth of the mounting chamber 16 is greater than the length of the positioning assembly 15. A fixed elastic member 161, connected to the positioning housing 151, is located on the bottom wall of the mounting chamber 16, away from the positioning block 153. This fixed elastic member 161 is a compression spring, with its ends fixed to the bottom wall of the mounting chamber 16 and the positioning housing 151, respectively. The positioning assembly 15 is radially slidably mounted within the mounting chamber 16 via the fixed elastic member 161.

[0047] The driving member 33 is in the shape of a vertical rod and is fixedly mounted on the side of the abutment portion 31 facing the shuttle bed 1. The mounting chamber 16 has an open slot 162 extending along the axial direction, penetrating the end surface of the opening portion 13 and allowing the driving member 33 to be inserted. The outer wall of the connecting housing has a pushing portion 154 corresponding to the open slot 162. The pushing portion 154 has an abutting slope 1541 for the end of the driving member 33 to abut. After the driving member 33 is axially inserted into the open slot 162, its end abuts against the abutting slope 1541, further pushing the driving member 33, thereby converting the axial thrust into a radial sliding force of the positioning assembly 15. After the abutment portion 31 and the end surface of the opening portion 13 are in contact, the positioning block 153 is disengaged from the positioning hole 211 and is then locked and secured by the locking member 141.

[0048] In order to reduce the probability of the driving member 33 being axially disengaged under the action of the fixed elastic member 161, the outer wall of the driving member 33 is also integrally provided with a plurality of elastic barbs 331 at intervals, and the side wall of the opening groove 162 has a ratchet groove 1621 that cooperates with the elastic barbs 331.

[0049] The implementation principle of the rotary hook structure of a sewing machine in an embodiment of the present application is as follows: first, the shuttle rack 2 is positioned and installed in the mounting ring groove 11 of the shuttle bed 1, and then the shuttle rack 2 is rotated until it cannot rotate. At this time, the positioning block 153 has been inserted into the positioning hole 211, thereby realizing the positioning of the shuttle rack 2; then, the inner shuttle pressure plate 3 is axially inserted, and the driving member 33 is inserted into the open through groove 162. Through the abutment cooperation between the abutting inclined surface 1541 and the driving member 33, the positioning assembly 15 as a whole slides radially away from the positioning hole 211, thereby releasing the positioning lock of the positioning block 153 and the positioning hole 211, and restoring the rotational cooperation between the shuttle rack 2 and the shuttle bed 1.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sewing machine rotary hook structure, comprising a shuttle bed (1), a shuttle frame (2) and an inner shuttle pressure plate (3), wherein the inner wall of the shuttle bed (1) has a mounting ring groove (11) for mounting the shuttle frame (2), and the shuttle bed (1) is provided with a covering portion (12) and an opening portion (13) on opposite sides of the mounting ring groove (11), characterized in that: The covering portion (12) has a limiting annular surface (121) corresponding to the inner wall of the shuttle bed (1), the inner diameter of the limiting annular surface (121) is larger than the inner diameter of the inner wall of the shuttle bed (1), and the limiting annular surface (121) is provided with guide inclined surfaces on both sides of the shuttle bed (1) axis direction.

2. A sewing machine hook structure according to claim 1, characterized in that: The guide bevel surface comprises a guide bevel plane (122) close to the inner bottom of the shuttle bed (1) and a guide bevel arc surface (123) facing the opening side of the shuttle bed (1).

3. The sewing machine hook structure according to claim 1, characterized in that: The inner shuttle pressure plate (3) is fixed to the opening portion (13), and a plurality of locking through holes (321) are circumferentially formed on the side wall of the inner shuttle pressure plate (3). The shuttle bed (1) has locking screw holes (14) corresponding one-to-one to the locking through holes (321), and a locking member (141) is threadedly connected to the locking screw holes (14).

4. The sewing machine hook structure according to claim 1, characterized in that: The opening portion (13) is provided with a positioning assembly (15) for positioning the shuttle rack (2); a side wall of the shuttle rack (2) is provided with a positioning hole (211) that cooperates with the positioning assembly (15); and the inner shuttle pressure plate (3) is provided with a driving member (33) that drives the positioning assembly (15) to disengage from the positioning hole (211).

5. The sewing machine hook structure according to claim 4, characterized in that: The positioning assembly (15) includes a positioning shell (151), a connecting elastic member (152) disposed in the positioning shell (151), and a positioning block (153) fixed to the end of the connecting elastic member (152). The positioning block (153) and the positioning hole (211) are plug-fitted together. When the connecting elastic member (152) is in a normal state, the positioning block (153) protrudes from the side wall of the mounting ring groove (11).

6. The rotary hook structure of a sewing machine according to claim 5, characterized in that: The positioning block (153) is provided with a first guide surface (1531) at an opening facing the shuttle bed (1).

7. The rotary hook structure of a sewing machine according to claim 5, characterized in that: The shuttle bed (1) is provided with an installation chamber (16) for installing the positioning housing (151), and the positioning housing (151) is provided with a fixing elastic member (161) connected to a side wall of the installation chamber (16) on a side away from the positioning block (153).

8. The rotary hook structure of a sewing machine according to claim 7, characterized in that: The installation chamber (16) has an opening slot (162) that passes through the end surface of the opening portion (13); the driving member (33) is inserted into the opening slot (162) and drives the positioning assembly (15) to move radially.

9. The sewing machine hook structure according to claim 8, characterized in that: The positioning housing (151) has a pushing portion (154) corresponding to the opening slot (162), and the pushing portion (154) has an abutting inclined surface (1541) for the driving member (33) to abut against.

10. The rotary hook structure of a sewing machine according to claim 8, characterized in that: An elastic barb (331) is provided on the side wall of the driving member (33), and an inner wall of the opening slot (162) has a ratchet groove (1621) that cooperates with the elastic barb (331).

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