An adjustable rotating hook hook holder, rotating hook assembly and sewing machine

Abstract

The application relates to an adjustable rotating shuttle holder, a rotating shuttle assembly and a sewing machine, which comprises a shuttle holder body, a needle guard adjusting block arranged to slide along the axis direction parallel to the shuttle holder body, an adjusting bolt mounted on the shuttle holder body, and a locking bolt connecting the shuttle holder body and the needle guard adjusting block and used for locking the needle guard adjusting block on the shuttle holder body; the inner side of the shuttle holder body is provided with an arrangement groove for the needle guard adjusting block to slide; the adjusting bolt is provided with a rotating part and an adjusting cam; the shuttle holder body is provided with a rotating through hole arranged for the rotating part to rotate and penetrating the inner and outer surfaces of the shuttle holder; the needle guard adjusting block is provided with an adjusting hole arranged for the adjusting cam to cooperate with the adjusting cam; and the needle guard adjusting block is provided with a needle guard surface. The application has the effect that when different types of machine needles are replaced, the rotating shuttle does not need to be replaced, and the needle guard structure on the rotating shuttle can accurately support the machine needle.

Description

Technical Field

[0001] This application relates to the field of sewing machine equipment, and more particularly to an adjustable rotary shuttle frame, a rotary shuttle assembly, and a sewing machine. Background Technology

[0002] In the field of sewing machine manufacturing and use, with the continuous development of the textile and garment processing industries, the performance and stability of sewing machines are receiving increasing attention. As a key component of the sewing machine, the rotary hook's core function is to achieve precise weaving of the top and bottom threads through its coordinated action with the needle, thereby forming a stable lockstitch.

[0003] The rotary shuttle includes an outer shuttle bed, an inner shuttle frame arranged inside the outer shuttle bed, and a bobbin case installed in the inner shuttle frame. The outer shuttle bed has a hook for hooking the thread at the needle, and the inner shuttle frame has a needle hole for the needle to pass through. A needle guard structure is provided on the bottom side of the needle hole on the inner shuttle frame to straighten the needle. When the sewing machine is running, when the needle is inserted into the needle hole, the needle guard structure can straighten the needle tip, reducing the probability of the hook breaking the needle as it rotates past one side of the needle.

[0004] Regarding the aforementioned technologies, the inventors believe that when changing to different sized needles, although adjusting the distance between the hook and the needle can ensure that the hook catches the thread, it may cause the needle guard structure of the inner shuttle frame to fail to effectively straighten the needle, or even hinder the normal movement of the needle through the needle hole. Utility Model Content

[0005] In order to enable the needle guard structure on the rotary hook to straighten the needle when changing to different types of needles, this application provides an adjustable rotary hook frame, a rotary hook assembly, and a sewing machine.

[0006] The adjustable rotary shuttle frame, rotary shuttle assembly, and sewing machine provided in this application adopt the following technical solution:

[0007] Firstly, this application provides an adjustable rotary shuttle frame, which adopts the following technical solution:

[0008] An adjustable shuttle frame includes a shuttle frame body, a needle guard adjustment block slidably arranged along an axis parallel to the shuttle frame body, an adjustment bolt mounted on the shuttle frame body, and a locking bolt connecting the shuttle frame body and the needle guard adjustment block and used to lock the needle guard adjustment block onto the shuttle frame body; the inner side of the shuttle frame body has an arrangement groove for the needle guard adjustment block to slide; the needle guard adjustment block is disposed from the inner side of the shuttle frame body toward the inner wall of the shuttle frame body; the adjustment bolt has a rotating part and an adjustment cam; the shuttle frame body has a rotating through hole for the rotating part to be rotatably arranged and penetrating the inner and outer surfaces of the shuttle frame; the needle guard adjustment block has an adjustment hole for the adjustment cam to be arranged and cooperating with the adjustment cam; the needle guard adjustment block has a needle guard surface.

[0009] In the existing technology, because the sewing machine needle moves up and down at high speed during operation, when the relative distance between the needle guard structure and the needle is not appropriate, the needle guard structure cannot straighten the needle tip when the needle tip is inserted through the needle hole. This makes the needle prone to swinging due to high-speed movement, which can easily cause the hook of the rotary shuttle bed to break the needle.

[0010] By adopting the above technical solution, after changing the sewing machine needle to a different model, the operator loosens the locking bolt on the main body of the shuttle frame and rotates the adjusting bolt, causing the needle guard adjusting block to slide along the axis parallel to the main body of the shuttle frame. This allows the needle guard surface in the needle guard adjusting block to contact the new needle. Then, the locking bolt is tightened to lock the needle guard adjusting block, ensuring that the needle guard surface in the adjusting block can straighten the new needle. This helps reduce the probability of the needle being broken by the hook during sewing machine operation and improves the working efficiency of the sewing machine.

[0011] Because the outer diameter of the needle varies only slightly, the vertical movement of the needle guard needs to be highly precise. The adjusting bolt includes a rotating part and an adjusting cam. By designing the outer contour of the adjusting cam, the needle guard adjusting block can move accurately on the shuttle body.

[0012] Optionally, the needle guard adjusting block has a limiting protrusion that mates with the circumferential notch of the bobbin sleeve.

[0013] By adopting the above technical solution, the needle guard adjustment block has a limiting protrusion that matches the circumferential notch of the bobbin sleeve, which can limit the circumferential rotation of the bobbin sleeve and help ensure the working stability of the rotary hook assembly.

[0014] Optionally, the end of the rotating part has a first tool groove.

[0015] By adopting the above technical solution, the first tool slot is designed to facilitate the use of the corresponding tool to rotate the rotating part, and to facilitate the operator to adjust the installation position of the needle protection adjustment block.

[0016] Optionally, the rotating part is connected to the adjusting cam, and the maximum adjusting radius of the adjusting cam is greater than the radius of the rotating part.

[0017] By adopting the above technical solution, the cooperation relationship between the rotating part and the adjusting cam is disclosed. By rotating the rotating part, the relative position of the adjusting cam in the adjusting hole can be adjusted, thereby adjusting the relative position of the needle guard adjusting block and the needle, so that the needle guard surface can effectively support the needle when the sewing machine is running. The maximum adjustment radius of the adjusting cam is greater than the radius of the rotating part, ensuring that the adjusting cam is not easy to disengage from the rotating through hole.

[0018] Optionally, the adjustment hole is a blind hole structure, and the side of the adjustment cam facing away from the rotating part is in contact with the inner bottom surface of the adjustment hole.

[0019] By adopting the above technical solution, the adjustment hole adopts a blind hole structure and the side of the adjustment cam facing away from the rotating part is in contact with the inner bottom surface of the adjustment hole. This makes it easier for the adjustment cam to move along the axis of the shuttle frame while preventing it from easily disengaging from the adjustment hole.

[0020] Optionally, the needle guard adjusting block has a locking screw hole on the side near the shuttle frame body that mates with the locking bolt, and the shuttle frame body has a countersunk hole structure for arranging the locking bolt, the axial direction of the countersunk hole structure being parallel to the axial direction of the shuttle frame body.

[0021] By adopting the above technical solution, the setting of the locking screw hole and countersunk hole structure, together with the locking bolt, locks the needle guard adjustment block in the arrangement groove of the shuttle frame body. The countersunk hole structure allows the bolt head of the locking bolt to be arranged inside the shuttle frame body, and allows the needle guard adjustment block to be adjusted along the axis parallel to the shuttle frame body. This achieves axial adjustment of the needle guard adjustment block while reducing the interference of the locking bolt on the hook hooking surface line, and improves the structural compactness of the shuttle frame.

[0022] Optionally, the top of the needle adjustment block is further provided with a guide surface on one side of the needle surface.

[0023] By adopting the above technical solution, a guide surface is set on one side of the needle protection surface at the top of the needle protection adjustment block. When the needle comes into contact with the guide surface, it has a straightening effect on the needle tip, which helps the sewing thread and other parts run smoothly when the sewing machine is working.

[0024] Optionally, the needle adjustment block is provided with a limiting groove, the guide surface is provided on the bottom surface of the limiting groove, and limiting side surfaces are formed on both sides of the limiting groove.

[0025] By adopting the above technical solution, the setting of the limiting through groove and the limiting side can reduce the risk of needle breakage caused by the needle hitting the shuttle body.

[0026] Secondly, this application provides a rotary hook assembly, which adopts the following technical solution:

[0027] A rotary shuttle assembly includes the aforementioned adjustable rotary shuttle frame.

[0028] Thirdly, this application provides a sewing machine, which adopts the following technical solution:

[0029] A sewing machine including the aforementioned rotary hook assembly.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. An adjustable shuttle frame, comprising a shuttle frame body, a needle guard adjustment block, an adjustment bolt, and a locking bolt; after changing the sewing machine needle to a different model, the operator loosens the locking bolt on the shuttle frame body and rotates the adjustment bolt, causing the needle guard adjustment block to slide along an axis parallel to the shuttle frame body, so that the needle guard surface in the needle guard adjustment block abuts against the new needle; then, the locking bolt is tightened to lock the needle guard adjustment block, so that the needle guard surface in the needle guard adjustment block can straighten the new needle; the adjustment bolt includes a rotating part and an adjustment cam, and by setting the outer contour of the adjustment cam, it helps to reduce the difficulty of adjusting the needle guard adjustment block and achieve precise movement of the needle guard adjustment block on the shuttle frame body;

[0032] 2. By setting an adjustable needle guard adjustment block, when changing different needles, the needle guard adjustment block can be adjusted to the appropriate position to achieve the needle guard alignment effect without changing the rotary hook, thereby reducing workload and helping to improve production efficiency.

[0033] 3. A rotary shuttle assembly, including an adjustable rotary shuttle frame, adopts an adjusting bolt and a locking bolt structure, which reduces the assembly difficulty without affecting the structural compactness of the rotary shuttle frame, reduces wear and loosening during long-term use, and thus ensures adjustment accuracy and sewing quality;

[0034] 4. A sewing machine, comprising a rotary shuttle assembly with an adjustable rotary shuttle frame; a needle guard adjustment block having a height-adjustable needle guard surface, which can support and straighten different types of needles during sewing, thereby facilitating a smooth sewing process. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the needle in Example 1.

[0036] Figure 2 This is a schematic diagram of the adjustable shuttle frame in Example 1.

[0037] Figure 3 This is a schematic diagram of the shuttle frame body in Example 1.

[0038] Figure 4 This is a schematic diagram of the needle adjustment block in Example 1.

[0039] Figure 5 This is a cross-sectional view of the needle guard adjustment block installed on the shuttle frame body in Embodiment 1.

[0040] Figure 6 This is a schematic diagram of the alignment between the positioning line and the adjustment scale in Example 1.

[0041] Figure 7 This is a schematic diagram of the adjusting bolt using a conventional cam structure in Example 1.

[0042] Figure 8 This is a schematic diagram of the adjusting bolt with an eccentric wheel structure used in Example 1.

[0043] Figure 9 This is a schematic diagram of the structure of the needle adjustment block in Example 2.

[0044] Figure 10 This is a schematic diagram of the structure of the needle adjustment block in Example 3.

[0045] Figure 11 This is a schematic diagram of the rotary shuttle assembly in Example 4.

[0046] Figure 12 This is a schematic diagram of the rotary shuttle bed in Example 4.

[0047] Figure 13 This is a schematic diagram of the bobbin sleeve in Example 4.

[0048] Explanation of reference numerals in the attached drawings: 1. Needle; 11. Mounting part; 12. Extension part; 121. Threading hole; 122. Relief groove; 13. Needle tip; 2. Shuttle body; 21. Base plate; 22. Side plate; 221. Needle hole; 222. Arrangement groove; 223. Adjustment scale; 23. Bobbin shaft; 24. Rotating through hole; 25. Countersunk hole structure; 251. First oblong hole; 252. Second oblong hole; 3. Needle guard adjusting block; 31. Adjusting part; 311. Adjusting hole; 312. Locking screw hole; 3 2. Needle guard; 321. Needle guard surface; 322. Guide surface; 323. Limiting side; 324. Limiting through groove; 33. Limiting protrusion; 4. Adjusting bolt; 41. Rotating part; 411. First tool groove; 412. Positioning line; 42. Adjusting cam; 5. Locking bolt; 51. Bolt head; 52. Locking screw; 6. Rotary shuttle; 61. Shuttle body; 611. Hook needle part; 62. Rotary shuttle crescent; 63. Outer shuttle skin; 7. Shuttle core sleeve; 71. Limiting post sleeve; 72. Circumferential notch. Detailed Implementation

[0049] The following is in conjunction with the appendixFigures 1-10 This application will be described in further detail.

[0050] Example 1

[0051] This application discloses an adjustable rotary shuttle frame. (Refer to...) Figure 1 The sewing needle 1 includes, along its length, a mounting portion 11 disposed on the sewing machine head, an extension portion 12 connected to the lower end of the mounting portion 11, and a needle tip 13 connected to the lower end of the extension portion 12. The extension portion 12 has a thread hole 121 extending through it along the length of the sewing needle 1 on the side near the needle tip 13 for the thread to pass through. The extension portion 12 has a clearance groove 122 on the side of the thread hole 121 away from the needle tip 13.

[0052] Reference Figure 2 The adjustable shuttle frame includes a shuttle frame body 2, a needle guard adjustment block 3 slidably arranged along an axis parallel to the shuttle frame body 2, an adjustment bolt 4 installed on the shuttle frame body 2, and a locking bolt 5 connecting the shuttle frame body 2 and the needle guard adjustment block 3 and used to lock the needle guard adjustment block 3 onto the shuttle frame body 2. The needle guard adjustment block 3 is disposed from the inside of the shuttle frame body 2 toward the inner wall of the shuttle frame body 2.

[0053] Reference Figure 2 and Figure 3 The shuttle frame body 2 includes a base plate 21, a side plate 22 vertically connected to the outer end of the base plate 21, and a bobbin shaft 23 vertically arranged at the center of the base plate 21. A needle-passing hole 221 is provided through the surface of the side plate 22 for the needle 1 to pass back and forth. The inner side of the side plate 22, below the needle-passing hole 221, has an arrangement groove 222 for the sliding of the needle guard adjustment block 3. The outer wall of the shuttle frame body is a smooth arc surface, reducing interference from the outer wall's circumferential winding of the thread during operation.

[0054] Reference Figure 3 and Figure 4 The needle protection adjusting block 3 includes an adjusting part 31 that fits against the bottom of the arrangement groove 222 and slides along the axis parallel to the shuttle body 2, and a needle protection part 32 connected to the top of the adjusting part 31 and cooperating with the needle tip 13 of the needle protection. The top of the needle protection part 32 has a needle protection surface 321, which is flush with the side wall of the needle hole 221. The needle protection part 32 has a guide surface 322 at the lower edge of the needle protection surface 321, and two limiting side surfaces 323 are symmetrically arranged at both ends of the guide surface 322. The guide surface 322 and the two limiting side surfaces 323 cooperate to form a limiting through groove 324.

[0055] Reference Figure 5The adjusting bolt 4 includes a rotating part 41 and an adjusting cam 42. One end of the rotating part 41 is connected to the adjusting cam 42, and the other end of the rotating part 41 has a first tool groove 411, allowing the operator to use a tool to rotate and adjust the adjusting bolt 4. The adjusting cam 42 adopts an eccentric wheel structure, and the maximum adjustment radius of the adjusting cam 42 is greater than the radius of the rotating part 41.

[0056] Reference Figure 5 and Figure 6 The shuttle frame body 2 has a rotating through hole 24 for the rotating part 41 to rotate through its inner and outer surfaces. The rotating part 41 and the rotating through hole 24 are clearance-fitted, allowing the rotating part 41 to rotate freely within the rotating through hole 24. The thickness of the rotating part 41 is less than the depth of the rotating through hole 24, so that the adjusting bolt 4 will not be exposed and interfere with the face thread wrapped around the outside of the shuttle frame body 2. The rotating part 41 has a positioning line 412 on its outer wall, and the shuttle frame body 2 has multiple adjustment scales 223 circumferentially arranged on the outer wall of the rotating through hole 24, allowing the operator to precisely adjust the needle guard surface 321 by aligning the positioning line 412 with different adjustment scales 223.

[0057] Reference Figure 5 The adjusting block 3 has an adjusting hole 311 in the adjusting part 31 for arranging and cooperating with the adjusting cam 42. The adjusting hole 311 is a blind hole structure, and the side of the adjusting cam 42 facing away from the rotating part 41 is in contact with the inner bottom surface of the adjusting hole 311. This contact means that the inner bottom surface of the adjusting hole 311 and the bottom surface of the arranging groove 222 do not clamp the adjusting cam 42 tightly, and the bottom surface of the adjusting hole 311 provides a certain guiding effect on the movement of the adjusting cam 42.

[0058] Reference Figure 7 and Figure 8 The adjusting cam 42 can be a traditional cam structure or an eccentric wheel structure. The maximum adjusting radius B of the adjusting cam 42 is greater than the radius b of the rotating part 41. By using a traditional cam structure or an eccentric wheel structure in conjunction with the adjusting hole 311, the position of the needle guard adjusting block 3 can be adjusted along the length of the arrangement groove 222.

[0059] Reference Figure 3 and Figure 5The locking bolt 5 includes a bolt head 51 and a locking screw 52 connected to the end of the bolt head 51. The adjusting part 31 of the needle guard adjusting block 3 has a locking screw hole 312 on the side near the shuttle body 2 that mates with the end of the locking screw 52. The shuttle body 2 has a countersunk structure 25 for arranging the locking bolt 5. The countersunk structure 25 is a strip-shaped countersunk hole and includes a first oblong hole 251 and a second oblong hole 252 along the installation direction of the locking bolt 5. The axial directions of the first oblong hole 251 and the second oblong hole 252 are both parallel to the axial direction of the shuttle body 2, and the diameter of the first oblong hole 251 is larger than the diameter of the second oblong hole 252, so that when the bolt head 51 of the locking bolt 5 is arranged in the first oblong hole 251, the needle guard adjusting block 3 can be locked in the arrangement groove 222.

[0060] Reference Figure 4 and Figure 5 The back of the needle guard adjusting block 3 is also provided with a limiting protrusion 33 that mates with the circumferential notch 72 of the bobbin sleeve 7. In this embodiment, the limiting protrusion 33 has its top end connected to the needle guard part 32 and its bottom end extending to the lower part of the needle guard adjusting block 3, and the lower end face of the limiting protrusion 33 is lower than the height of the adjusting hole 311, that is, the projection of the adjusting hole 311 falls on the side of the limiting protrusion 33. In related technologies, a limiting structure that mates with the bobbin sleeve 7 is usually provided. In this embodiment, the above-mentioned limiting structure and the needle guard adjusting block 3 are combined with each other, resulting in a high degree of structural compactness. This helps to ensure the thickness of the needle guard adjusting block 3, the depth of the adjusting hole 311 and the depth of the locking screw hole 312, and ensures the fitting strength and accuracy of the needle guard adjusting block 3, the adjusting bolt 4 and the locking bolt 5, thereby making the structure more reasonable.

[0061] The implementation principle of an adjustable shuttle frame according to an embodiment of this application is as follows: After changing the sewing machine needle 1 to a different model, the operator first loosens the locking bolt 5 at the main body 2 of the shuttle frame, then rotates the adjusting bolt 4 to make the needle guard adjusting block 3 slide along the axis parallel to the main body 2 of the shuttle frame, so that the needle guard surface 321 in the needle guard adjusting block 3 abuts against the new needle 1. Finally, the locking bolt 5 is tightened to lock the needle guard adjusting block 3, so that the needle guard surface 321 in the needle guard adjusting block 3 can effectively straighten the new needle 1.

[0062] Example 2

[0063] Except for the structure of the limiting protrusion 33 in the needle adjustment block 3, which is different from that in Embodiment 1, the adjustable shuttle frame in this application is identical to that in Embodiment 1.

[0064] Reference Figure 9In this embodiment, the limiting protrusion 33 can also be configured such that its top end is connected to the protective pin portion 32 and its bottom end extends to the middle of the protective pin adjusting block 3. The lower end face of the limiting protrusion 33 is higher than the height of the locking screw hole 312, which extends from the surface of the adjusting portion 31 to the surface of the limiting protrusion 33, resulting in good locking strength of the locking bolt 5 on the protective pin adjusting block 3. The adjusting hole 311 in the protective pin adjusting block 3 is a through hole.

[0065] Example 3

[0066] Except for the structure of the limiting protrusion 33 in the needle adjustment block 3, which is different from that in Embodiment 1, the adjustable shuttle frame in this application is identical to that in Embodiment 1.

[0067] Reference Figure 10 In this embodiment, the limiting protrusions 33 are symmetrically arranged limiting columns. The cross-section of the limiting columns is circular. One limiting column abuts against one side of the circumferential notch 72 of the bobbin sleeve 7, and the other limiting column abuts against the other side of the circumferential notch 72 of the bobbin sleeve 7, so that the bobbin sleeve 7 is installed on the bobbin frame body 2 with a high degree of compactness.

[0068] Example 4

[0069] This application discloses a rotary hook assembly. (Refer to...) Figure 11 The rotary shuttle assembly includes a rotary shuttle bed 6, a shuttle core sleeve 7, and the adjustable rotary shuttle frame as described in Embodiment 1. The adjustable rotary shuttle frame is rotatably mounted within the rotary shuttle bed 6, and the shuttle core sleeve 7 is mounted on the shuttle core shaft 23 of the adjustable rotary shuttle frame.

[0070] Reference Figure 5 and Figure 12 The rotary shuttle bed 6 includes a shuttle bed body 61, a rotary shuttle ring 62 arranged outside the shuttle bed body 61, and an outer shuttle skin 63 arranged outside the rotary shuttle ring 62. The shuttle bed body 61 has a hook part 611 that cooperates with the needle 1 to hook the thread. When the needle tip 13 of the needle 1 just contacts the guide surface 322 of the needle guard adjustment block 3, the clearance groove 122 can avoid the hook part 611, thereby reducing the risk of collision between the needle 1 and the hook part 611.

[0071] Reference Figure 13 The bottom of the bobbin sleeve 7 is provided with a limiting post sleeve 71 that cooperates with the bobbin shaft 23 and is used for arranging the bobbin parts. The mounting housing has a circumferential notch 72 on the side, so that when the bobbin sleeve 7 is installed in the adjustable rotary shuttle frame, the circumferential notch 72 is engaged with both ends of the limiting protrusion 33, which reduces the risk of the bobbin sleeve 7 moving left and right during use without affecting the structural compactness of the rotary shuttle assembly.

[0072] Example 5

[0073] Except for the adjustable shuttle frame, which differs from that of Example 4, the rest of the structure in this embodiment is identical to that of Example 4. The adjustable shuttle frame in this embodiment is the same as that in Example 2.

[0074] Example 6

[0075] Except for the adjustable shuttle frame, which differs from that of Example 4, the rest of the structure in this embodiment is identical to that of Example 4. The adjustable shuttle frame in this embodiment is the same as that in Example 3.

[0076] Example 7

[0077] This application discloses a sewing machine. The sewing machine includes the rotary hook assembly of embodiment 4. When changing to different types of needles 1, the operator can adjust the relative position of the needle guard adjustment block 3 and the shuttle body 2 so that the needle guard structure on the rotary hook can straighten the needle 1.

[0078] Example 8

[0079] This application discloses a sewing machine. The sewing machine includes the rotary hook assembly as in embodiment 5. When changing to a different type of needle 1, the operator can adjust the relative position of the needle guard adjustment block 3 and the shuttle body 2 so that the needle guard structure on the rotary hook can straighten the needle 1.

[0080] Example 9

[0081] This application discloses a sewing machine. The sewing machine includes the rotary hook assembly of embodiment 6. When changing to different types of needles 1, the operator can adjust the relative position of the needle guard adjustment block 3 and the shuttle body 2 so that the needle guard structure on the rotary hook can straighten the needle 1.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An adjustable rotary shuttle frame, characterized in that, The device includes a shuttle frame body (2), a needle guard adjustment block (3) slidably arranged along an axis parallel to the shuttle frame body (2), an adjustment bolt (4) mounted on the shuttle frame body (2), and a locking bolt (5) connecting the shuttle frame body (2) and the needle guard adjustment block (3) and used to lock the needle guard adjustment block (3) onto the shuttle frame body (2); the inner side of the shuttle frame body (2) has an arrangement groove (222) for the needle guard adjustment block (3) to slide; the needle guard adjustment block (3) is located on the shuttle frame body. The inner side of the main body (2) is provided to the inner wall of the shuttle frame main body (2); the adjusting bolt (4) has a rotating part (41) and an adjusting cam (42); the shuttle frame main body (2) has a rotating through hole (24) for the rotating part (41) to be rotated and to penetrate the inner and outer surfaces of the shuttle frame main body (2); the needle protection adjusting block (3) has an adjusting hole (311) for the adjusting cam (42) to be arranged and to cooperate with the adjusting cam (42); the needle protection adjusting block (3) has a needle protection surface (321).

2. The adjustable rotary shuttle frame according to claim 1, characterized in that, The needle adjustment block (3) has a limiting protrusion (33) that mates with the circumferential notch (72) of the bobbin sleeve (7).

3. The adjustable rotary shuttle frame according to claim 1, characterized in that, The end of the rotating part (41) has a first tool groove (411).

4. An adjustable rotary shuttle frame according to claim 1, characterized in that, The rotating part (41) is connected to the adjusting cam (42), and the maximum adjusting radius of the adjusting cam (42) is greater than the radius of the rotating part (41).

5. An adjustable rotary shuttle frame according to claim 1, characterized in that, The adjustment hole (311) is a blind hole structure, and the side of the adjustment cam (42) facing away from the rotating part (41) is in contact with the inner bottom surface of the adjustment hole (311).

6. An adjustable rotary shuttle frame according to claim 1, characterized in that, The needle adjustment block (3) has a locking screw hole (312) on the side near the shuttle body (2) that mates with the locking bolt (5). The shuttle body (2) has a countersunk hole structure (25) for arranging the locking bolt (5), and the axial direction of the countersunk hole structure (25) is parallel to the axial direction of the shuttle body (2).

7. An adjustable rotary shuttle frame according to claim 1, characterized in that, The top of the needle adjustment block (3) is also provided with a guide surface (322) on one side of the needle surface (321).

8. An adjustable rotary shuttle frame according to claim 7, characterized in that, The needle adjustment block (3) is provided with a limiting groove (324), the guide surface (322) is provided on the bottom surface of the limiting groove (324), and limiting side surfaces (323) are formed on both sides of the limiting groove (324).

9. A rotary shuttle assembly, characterized in that, Includes the adjustable shuttle frame as described in any one of claims 1-8.

10. A sewing machine, characterized in that, Includes the rotary shuttle assembly as described in claim 9.

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