A sewing machine bushing anti-dislodgement and multi-level elastic locking and limiting device

Abstract

This invention relates to the field of sewing machine parts technology, specifically to a sewing machine bushing anti-detachment and multi-level elastic locking and limiting device, comprising a housing, a mounting ring, a limiting mechanism, a locking plate, and an adjusting mechanism. The housing is installed on the outside of the bushing body, the mounting ring is installed inside the housing, the limiting mechanism is installed on the bushing body inside the housing, the locking plate is located on the outside of the housing, and the adjusting mechanism is installed on the outside of the housing. The device automatically locks the bushing after installation to form multi-level elastic limiting at the installation location, while simultaneously compensating for bushing misalignment.

Description

Technical Field

[0001] This invention relates to the field of sewing machine parts technology, specifically to a sewing machine bushing anti-detachment and multi-level elastic locking and limiting device. Background Technology

[0002] The sewing machine bushing anti-drop and multi-stage elastic snap-fit ​​limiting device is a mechanical device used in the transmission system of a sewing machine. It is mainly used to prevent the bushing from falling off during high-speed operation, and achieves precise limiting and control of the bushing position through a multi-stage elastic snap-fit ​​structure.

[0003] Existing technologies typically use a fixed locking method to secure the bushing. Given the high-speed rotation of the shaft within the bushing, on one hand, over time, the shaft will come into contact with the bushing, causing the bushing itself to loosen. This loosening will be transmitted to the bushing's own mounting, leading to separation at the mounting point and ultimately causing the bushing to fall off. On the other hand, with prolonged use, the bushing will wear down. If the bushing remains fixed, the wear from the shaft will intensify, and the frictional resistance of the bushing will also hinder the shaft's normal operation.

[0004] Existing technologies employ elastic snap-fit ​​mechanisms based on a certain installation space for the bushing. These mechanisms utilize multiple anti-dislodgement methods to prevent the bushing from detaching due to loosening when it is misaligned. They also utilize elasticity to allow for multi-position adjustment of the bushing. However, these methods are designed for bushings of standard sizes. Since the dimensions of multiple bushings on a sewing machine spindle are not entirely consistent, and their different functions require different types of bushings—such as drive bushings that withstand high torque, support bushings that provide radial support, and guide bushings that guide thread or fabric—conventional elastic limiting devices are difficult to install on different bushings. Specific designs are needed for different bushings. Furthermore, when the shaft causes the bushing to tilt, different elastic limiting devices cannot provide uniform adjustment, thus affecting the bushing's limiting function and its adaptability to the shaft.

[0005] Based on this, in order to solve the problem of difficulty in balancing the installation balance and adaptability of each bushing when installing bushings at different positions on the same rotating shaft due to different sizes, this invention designs a sewing machine bushing anti-drop-off and multi-level elastic snap-fit ​​limiting device. Summary of the Invention

[0006] The present invention provides a sewing machine bushing anti-drop and multi-level elastic locking limit device, which solves the problem of difficulty in balancing the installation balance and adaptability of bushings when installing bushings at different positions on the same rotating shaft due to different sizes. The device forms a multi-level elastic limit on the installation position by automatically locking the bushing after installation, and at the same time provides skew compensation for the bushing.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a sewing machine bushing anti-detachment and multi-stage elastic locking and limiting device, comprising a housing, a mounting ring, a limiting mechanism, a locking plate, and an adjusting mechanism. The housing is installed on the outside of the bushing body, the mounting ring is installed inside the housing, the limiting mechanism is installed on the bushing body inside the housing, the locking plate is located on the outside of the housing, and the adjusting mechanism is installed on the outside of the housing. The limiting mechanism locks the bushing body through the mounting ring, and the limiting mechanism drives the adjusting mechanism to fix the housing while compensating for the misalignment of the bushing body. During the installation of the bushing body, the bushing body is first fixed by the housing, and then the housing is limited, thereby enabling the housing to achieve multi-stage elastic locking, thus improving the adaptability of the bushing body installation.

[0009] Preferably, the limiting mechanism includes a slide groove, a slider, a limiting block, a return spring, a tension spring, and a sliding plate. The slide groove is formed on the outer shell, the limiting block is installed in the slide groove, the limiting block is installed at the slot on the slider, a return spring is installed between the limiting block and the slider, the tension spring is installed between the sliding plate and the outer shell, the sliding plate is installed on the side of the slider away from the limiting block, and the sliding plate slides above the slide groove. When the bushing body is installed into the outer shell, it will first directly abut against the mounting ring. During the sliding process of the bushing body, the slider moves horizontally and upward simultaneously, cooperating with the mounting ring to initially limit the bushing body.

[0010] Preferably, the adjusting mechanism includes a telescopic block, a compression spring, and a retaining ring. The telescopic block is installed on the back of the slide plate, the compression spring is installed between the telescopic block and the slide plate, the retaining plate is installed on the outside of the outer shell, and the retaining ring is movably installed on the outside of the outer shell. A rigid spring connects the retaining ring and the retaining plate. The slide plate restricts the retaining ring. When the slide plate moves to the right under the action of the slider, it will drive the retaining ring to move to the right initially, thereby achieving a preliminary self-check of the retaining ring and the rigid spring, avoiding problems such as the retaining ring getting stuck or the rigid spring failing. Subsequently, the retaining ring and the retaining plate lock the outer shell, thereby achieving multi-stage elastic locking.

[0011] Preferably, the telescopic block has an inclined surface on its upper part, the telescopic blocks are arranged in an array, and the inclined surface is unidirectional. The retaining ring will advance layer by layer, and will also be limited by the telescopic block it just passed, thereby realizing multi-level locking.

[0012] Preferably, a wedge-shaped surface is provided below the limiting block, and limiting grooves are arrayed on the outer shell corresponding to the sliding groove. A locking block is installed on the side wall of the sliding plate corresponding to the limiting groove. The wedge-shaped surface facilitates the movement of the bushing body and the installation of the bushing body. After the bushing body is installed, the sliding plate moves downward and drives the locking block to embed into the limiting groove, thereby locking the sliding plate and the slider. After the slider is locked, the slider drives the limiting block to lock the bushing body simultaneously, improving the anti-dislodgement effect of the bushing body.

[0013] Preferably, the slider has a slope on one side of the inclined plane, and the slope of the slope is the same as that of the wedge-shaped surface. Since the slope of the slope is the same as that of the wedge-shaped surface, the distance the slope moves upward per unit time is equal to the distance the limit block moves upward, thereby pushing the slider and the slide plate upward, realizing the function of automatic adjustment and installation, and further improving the convenience of bushing installation.

[0014] Preferably, the slider has a mounting groove corresponding to the tension spring, and a movable block is installed in the mounting groove. The movable block is connected to the tension spring. By setting the mounting groove and the movable block, when the slider moves up or down, the tension spring is always flush with the movable block, while the movable block slides up and down within the mounting groove, thereby maintaining the stability of the tension spring and the sliding plate.

[0015] Preferably, the inner wall of the outer casing has a ring array of buffer springs, the buffer springs are located at the mounting ring, and a plate is installed on the side of the buffer springs away from the outer casing. The buffer springs can drive the plate to compensate for the bushing body, thereby making the bushing body buffered and avoiding hard contact between the bushing body and the rotating shaft. On the one hand, this reduces wear on the bushing body, and on the other hand, it reduces friction between the bushing and the rotating shaft, thus avoiding interference with the normal operation of the rotating shaft.

[0016] Preferably, the mounting plate has a mounting surface on the side facing away from the mounting ring, and a through hole is formed on the surface of the mounting plate. The mounting surface allows the bushing body to pass smoothly, avoiding any obstruction to the installation of the bushing body by the mounting plate, and the through hole further improves the heat dissipation effect of the bushing body.

[0017] Preferably, after the bushing body is installed, the diameter of the circle formed by the midpoints of the mounting plates is smaller than the inner diameter of the outer shell, and the number of buffer springs on the back of a single mounting plate is two or more. There is a margin between the mounting plate and the outer shell, allowing the bushing body to undergo local adjustment when the shaft is misaligned under the action of the buffer springs, thereby improving the bushing's adaptability to changes in the shaft.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The present invention proposes a sewing machine bushing anti-detachment and multi-level elastic locking and limiting device. During the installation of the bushing body, the bushing body is first fixed by the outer shell, and then the outer shell is limited, so that the outer shell can achieve multi-level elastic locking. Then, when the bushing body shakes and loosens due to the high-speed rotation of the shaft, the bushing body and the outer shell are locked layer by layer by the cooperation of the limiting mechanism and the adjusting mechanism, thereby ensuring that the bushing body will not easily detach from the outer shell. At the same time, it can also adapt to the fixing and installation of different bushing bodies, thereby improving the adaptability of bushing body installation.

[0020] 2. The sewing machine bushing anti-dislodgement and multi-stage elastic locking and limiting device proposed in this invention, in the initial state, the sliding plate restricts the retaining ring. When the sliding plate moves to the right under the action of the slider, it will drive the retaining ring to move to the right initially, thereby realizing the initial self-check of the retaining ring and the hard spring, avoiding problems such as the retaining ring jamming or the hard spring failing. After confirming that there is no problem, the retaining ring and the locking plate are aligned with the place to be installed, with the end face of the locking plate facing the retaining ring and fitting against the installation side. By pressing the sliding plate downward, the slider will further limit the bushing body, thereby locking the bushing. During the downward movement of the sliding plate, the restriction of the retaining ring by the sliding plate is also released, and the retaining ring will be stretched by the hard spring and fit against the locking plate, thereby locking the outer shell through the retaining ring and the locking plate. During the movement, the retaining ring will gradually push the telescopic block, and the telescopic block will compress the spring, thereby realizing multi-stage elastic locking and improving the ease of installation of the bushing.

[0021] 3. The sewing machine bushing anti-dislodgement and multi-stage elastic locking and limiting device proposed in this invention uses a wedge-shaped surface to compress the limiting block, causing the limiting block to compress the return spring, while leaving space for the bushing body to move, thus facilitating the installation of the bushing body. After the bushing body is installed, the sliding plate moves downward and drives the locking block to embed into the limiting groove, thereby locking the sliding plate and the slider. After the slider is locked, the slider drives the limiting block to lock the bushing body simultaneously, thereby locking the bushing body by the locking of the outer shell, thus improving the anti-dislodgement effect of the bushing body; at the same time, the retaining ring will form a constraint and fixation on the outer shell with the retaining plate, and the retaining ring is blocked by the back of the inclined surface on the telescopic block, thus achieving elastic limiting of the retaining ring, thereby achieving multi-stage elastic limiting of the bushing body. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a half-sectional schematic diagram of the present invention;

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the adjusting mechanism of the present invention;

[0027] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0028] Figure 6 This is a schematic diagram of the structure at the mounting plate of the present invention;

[0029] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0030] Figure 8 This is a schematic diagram of the locking block of the present invention;

[0031] Figure 9 yes Figure 8 Enlarged view of point D in the middle.

[0032] In the diagram: P, bushing body; 1, outer shell; 11, limiting groove; 12, buffer spring; 2, mounting ring; 3, limiting mechanism; 31, sliding groove; 32, slider; 321, slope; 322, mounting groove; 323, movable block; 33, limiting block; 331, wedge-shaped surface; 34, return spring; 35, tension spring; 36, sliding plate; 4, locking plate; 5, adjusting mechanism; 51, telescopic block; 511, inclined surface; 52, compression spring; 54, retaining ring; 55, rigid spring; 6, locking block; 7, mounting plate. Detailed Implementation

[0033] To better understand the above solution, the technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 As shown, the present invention provides a sewing machine bushing anti-detachment and multi-stage elastic locking and limiting device, including a housing 1, a mounting ring 2, a limiting mechanism 3, a locking plate 4, and an adjusting mechanism 5. The housing 1 is installed on the outside of the bushing body P, the mounting ring 2 is installed inside the housing 1, the limiting mechanism 3 is installed at the bushing body P inside the housing 1, the locking plate 4 is located on the outside of the housing 1, and the adjusting mechanism 5 is installed on the outside of the housing 1. The limiting mechanism 3 locks the bushing body P through the mounting ring 2, and the limiting mechanism 3 drives the adjusting mechanism 5 to fix the housing 1 while compensating for the deviation of the bushing body P.

[0035] When the bushing body P is installed, the bushing slides inward along the outer shell 1 until it reaches the mounting ring 2. One end of the bushing body P is in contact with the mounting ring 2. When the bushing body P is installed, the limiting mechanism 3 will elastically limit the bushing body P. At the same time, the clamping plate 4 will also clamp the outer end. At this time, the adjusting mechanism 5 will drive the clamping plate 4 to move laterally, thereby driving the clamping plate 4 to lock the outer shell 1, thus preventing the outer shell 1 from falling off, and further preventing the bushing body P from falling off.

[0036] During the installation of the bushing body P, the bushing body P is first fixed by the outer shell 1, and then the outer shell 1 is limited, so that the outer shell 1 can achieve multi-level elastic locking. Then, when the bushing body P shakes and loosens due to the high speed rotation of the shaft, the limiting mechanism 3 and the adjusting mechanism 5 cooperate with each other to lock the bushing body P and the outer shell 1 layer by layer, thereby ensuring that the bushing body P will not easily detach from the outer shell 1. At the same time, it can also adapt to the fixing and installation of different bushing bodies P, thereby improving the adaptability of the bushing body P installation.

[0037] like Figure 2-3 As shown, the limiting mechanism 3 includes a slide groove 31, a slider 32, a limiting block 33, a return spring 34, a tension spring 35, and a sliding plate 36. The slide groove 31 is formed on the outer shell 1. The limiting block 33 is installed in the slide groove 31. The limiting block 33 is installed at the slot on the slider 32. The return spring 34 is installed between the limiting block 33 and the slider 32. The tension spring 35 is installed between the sliding plate 36 and the outer shell 1. The sliding plate 36 is installed on the side of the slider 32 away from the limiting block 33. The sliding plate 36 slides above the slide groove 31.

[0038] When the bushing body P is installed into the housing 1, it will first directly abut against the mounting ring 2. During the sliding process of the bushing body P, it will pass through the slider 32 and the limiting block 33 in the slide groove 31, which will drive the limiting block 33 and the slider 32 to move upward synchronously. At this time, the limiting block 33 will squeeze the return spring 34, and then the limiting block 33 will enter the groove on the surface of the slider 32. The bushing body P will pass the limiting block 33 and reach the right end of the limiting block 33. When the slider 32 moves upward, the tension spring 35 will also pull the slider 32 to move to the right. Then the limiting block 33 will be located on the left side of the bushing body P, and then cooperate with the mounting ring 2 to initially limit the bushing body P, and simultaneously drive the slide plate 36 to move to the right.

[0039] like Figure 2-5As shown, the adjustment mechanism 5 includes a telescopic block 51, a compression spring 52, and a retaining ring 54. The telescopic block 51 is installed on the back of the slide plate 36, the compression spring 52 is installed between the telescopic block 51 and the slide plate 36, the retaining plate 4 is installed on the outside of the outer shell 1, the retaining ring 54 is movably installed on the outside of the outer shell 1, and a rigid spring 55 is connected between the retaining ring 54 and the retaining plate 4.

[0040] A telescopic block 51 is mounted on the back of the slide plate 36 via a compression spring 52. In the initial state, the slide plate 36 restricts the retaining ring 54. When the slide plate 36 moves to the right under the action of the slider 32, it will drive the retaining ring 54 to move to the right initially, thereby achieving a preliminary self-check of the retaining ring 54 and the rigid spring 55, avoiding problems such as the retaining ring 54 getting stuck or the rigid spring 55 failing. After confirming that everything is correct, the retaining ring 54 and the retaining plate 4 are aligned with the place where they need to be installed, and the retaining plate 4 is fitted against the end face of the retaining ring 54. On the side, by pressing the slide plate 36 downward, the slider 32 will further limit the bushing body P, thereby locking the bushing; while the slide plate 36 is moving downward, the restriction of the slide plate 36 on the retaining ring 54 is also released, and the retaining ring 54 will be stretched by the hard spring 55 to fit against the retaining plate 4, thereby locking the outer shell 1 through the retaining ring 54 and the retaining plate 4. During the movement, the retaining ring 54 will gradually push the telescopic block 51, and the telescopic block 51 will squeeze the compression spring 52, thereby achieving multi-stage elastic locking.

[0041] like Figure 8 As shown, an inclined surface 511 is provided above the telescopic block 51, the telescopic blocks 51 are arranged in an array, and the inclined surface 511 is arranged in one direction.

[0042] Under the action of multiple telescopic blocks 51, the retaining ring 54 will advance layer by layer, and will also be limited layer by layer by the telescopic blocks 51 that it has just passed, thereby realizing multi-level locking. The inclined surface 511 is used to reduce resistance when the retaining ring 54 moves towards the retaining plate 4, so that the retaining ring 54 can quickly pass over the telescopic blocks 51, thereby realizing the installation of the bushing body P.

[0043] like Figure 2 , 3 As shown in Figures 8 and 9, a wedge-shaped surface 331 is provided below the limiting block 33, and a limiting groove 11 is arrayed on the outer shell 1 corresponding to the sliding groove 31. A locking block 6 is installed on the side wall of the sliding plate 36 corresponding to the limiting groove 11.

[0044] The wedge-shaped surface 331 facilitates the movement of the bushing body P. When the bushing body P moves toward the mounting ring 2, the wedge-shaped surface 331 can press the limiting block 33, causing the limiting block 33 to press the return spring 34. At the same time, it provides space for the bushing body P to move, thus facilitating the installation of the bushing body P. After the bushing body P is installed, the sliding plate 36 moves downward and drives the locking block 6 to embed into the limiting groove 11, thereby locking the sliding plate 36 and the slider 32. After the slider 32 is locked, the slider 32 drives the limiting block 33 to lock the bushing body P simultaneously. Thus, the locking of the outer shell 1 abuts and locks the bushing body P, thereby improving the anti-fall-off effect of the bushing body P. At the same time, the retaining ring 54 will form a constraint and fixation on the outer shell 1 with the retaining plate 4. The retaining ring 54 is blocked by the back of the inclined surface 511 on the telescopic block 51, thereby achieving elastic limiting of the retaining ring 54, thus achieving multi-level elastic limiting of the bushing body P.

[0045] like Figure 3 As shown, the slider 32 has a slope 321 on one side of the wedge surface 331, and the slope of the slope 321 is the same as that of the wedge surface 331.

[0046] While the bushing body P pushes the limiting block 33, it also pushes the slider 32 to move upward. Since the slope 321 and the wedge surface 331 have the same slope, the distance that the slope 321 moves upward per unit time is equal to the distance that the limiting block 33 moves upward. This can push the slider 32 and the slide plate 36 to rise, realize the function of automatic adjustment and installation, and further improve the convenience of bushing installation.

[0047] like Figure 4 , 5 As shown, the slider 32 has a mounting groove 322 corresponding to the tension spring 35, and a movable block 323 is installed in the mounting groove 322. The movable block 323 is connected to the tension spring 35.

[0048] The mounting groove 322 and the movable block 323 are designed to prevent the upward movement of the slider 32 from interfering with the lateral movement of the tension spring 35. This is because the tension spring 35 generally extends and retracts along the direction of spring movement, while the slider 32 will move perpendicular to the direction of tension of the tension spring 35. Therefore, the mounting groove 322 and the movable block 323 are provided so that when the slider 32 moves up or down, the tension spring 35 is always flush with the movable block 323, while the movable block 323 slides up and down within the mounting groove 322, thereby maintaining the stability of the tension spring 35 and the slide plate 36.

[0049] like Figure 6 , 7 As shown, the inner wall of the outer shell 1 has a ring array of buffer springs 12, the buffer springs 12 are located at the mounting ring 2, and a plate 7 is installed on the side of the buffer springs 12 away from the outer shell 1.

[0050] After the bushing body P is installed, the mounting plate 7 comes into contact with the bushing body P. The ring array of mounting plates 7, under the action of the buffer spring 12, can effectively buffer and compensate for the positional deviation of the bushing body P. When the bushing body P is misaligned, the buffer spring 12 can drive the mounting plate 7 to compensate for the bushing body P, thereby buffering the bushing body P and preventing the bushing body P from making hard contact with the shaft. This reduces wear on the bushing body P and friction between the bushing and the shaft, thus avoiding interference with the normal operation of the shaft.

[0051] The mounting plate 7 has a mounting surface on the side opposite to the mounting ring 2, and the surface of the mounting plate 7 has through holes.

[0052] The mounting surface allows the bushing body P to pass smoothly, preventing the mounting plate 7 from obstructing the installation of the bushing body P. It also serves to position the bushing. The mounting plate 7 transforms the annular connection around the bushing body P into a line contact, thereby improving the heat dissipation of the bushing body P. The through hole further enhances the heat dissipation of the bushing body P.

[0053] After the bushing body P is installed, the diameter of the circle formed by the middle of the mounting plate 7 is smaller than the inner diameter of the outer shell 1, and the number of buffer springs 12 on the back of a single mounting plate 7 is two or more.

[0054] There is a margin between the plate 7 and the outer shell 1. Under the action of the buffer spring 12, the bushing body P can be locally adjusted when the shaft is tilted. By setting multiple buffer springs 12 on the back of a single plate 7, the bushing can tilt the plate 7 along the tilt direction of the shaft. That is, the length of the buffer spring 12 on the back of a single plate 7 can be different, thereby improving the adaptability of the bushing to changes in the shaft.

[0055] When the bushing body P needs to be installed, the operator takes out the device and inserts the bushing body P into the outer shell 1 from the left. The bushing slides to the right, which pushes the slider 32 and the limiting block 33 to move upward. Then, it pushes the annular array plate 7. The annular array plate 7 forms a limit around the bushing under the action of the buffer spring 12 until the bushing slides to the mounting ring 2. The bushing body P will pass the limiting block 33 and reach the right end of the limiting block 33. The limiting block 33 forms a limit on the left side of the bushing, which, together with the plate 7 and the mounting ring 2, achieves the locking and anti-dislodgement effect of the bushing body P.

[0056] During the sliding process of the bushing body P, it passes through the slider 32 and the limiting block 33 in the slide groove 31, which will drive the limiting block 33 and the slider 32 to move upward synchronously. At this time, the limiting block 33 will squeeze the return spring 34, and then the limiting block 33 will enter the groove on the surface of the slider 32. When the slider 32 moves upward, the limiting block 33 will be located on the left side of the bushing body P, and then cooperate with the mounting ring 2 to initially limit the bushing body P. After the slider 32 contacts the restriction of the outer shell 1, the tension spring 35 will also pull the slide plate 36 to move to the right. The back of the slide plate 36 is equipped with a telescopic block 51 through the compression spring 52. In the initial state, the slide plate 36 restricts the retaining ring 54. When the slide plate 36 is subjected to sliding... When block 32 moves to the right, it will cause the retaining ring 54 to initially move to the right. At this time, the operator aligns the retaining ring 54 and the retaining plate 4 with the installation position. The end face of the retaining ring 54 is directly opposite the installation side. By pressing the sliding plate 36 downward, the slider 32 will further limit the bushing body P, thereby locking the bushing. As the sliding plate 36 moves downward, the restriction of the retaining ring 54 by the sliding plate 36 is also released. Then the retaining ring 54 will be stretched by the hard spring 55 and fit against the retaining plate 4. Thus, the retaining ring 54 and the retaining plate 4 lock the outer shell 1. During the movement, the retaining ring 54 will gradually push the telescopic block 51. The telescopic block 51 squeezes and compresses the spring 52, thereby achieving multi-stage elastic locking.

[0057] The foregoing has shown and described the basic principles and beneficial effects of the present invention. However, the present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its effects and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A sewing machine bushing anti-detachment and multi-stage elastic locking and limiting device, installed on the sewing machine bushing, characterized in that: The assembly includes a housing (1), a mounting ring (2), a limiting mechanism (3), a clamping plate (4), and an adjusting mechanism (5). The housing (1) is installed on the outside of the bushing body (P), the mounting ring (2) is installed inside the housing (1), the limiting mechanism (3) is installed at the bushing body (P) inside the housing (1), the clamping plate (4) is located on the outside of the housing (1), and the adjusting mechanism (5) is installed on the outside of the housing (1). The limiting mechanism (3) locks the bushing body (P) through the mounting ring (2), and the limiting mechanism (3) drives the adjusting mechanism (5) to fix the housing (1) while compensating for the skewness of the bushing body (P). The limiting mechanism (3) includes a slide groove (31), a slider (32), a limiting block (33), a return spring (34), a tension spring (35), and a sliding plate (36). The slide groove (31) is opened on the outer shell (1). The limiting block (33) is installed in the slide groove (31). The limiting block (33) is installed at the slot on the slider (32). The return spring (34) is installed between the limiting block (33) and the slider (32). The sliding plate (36) is installed on the side of the slider (32) away from the limiting block (33). The tension spring (35) is installed between the sliding plate (36) and the outer shell (1). The sliding plate (36) slides above the slide groove (31). The adjustment mechanism (5) includes a telescopic block (51), a compression spring (52), and a retaining ring (54). The telescopic block (51) is installed on the back of the slide plate (36), the compression spring (52) is installed between the telescopic block (51) and the slide plate (36), the retaining plate (4) is installed on the outside of the outer shell (1), the retaining ring (54) is movably installed on the outside of the outer shell (1), and a rigid spring (55) is connected between the retaining ring (54) and the retaining plate (4). An inclined surface (511) is provided above the telescopic block (51), the telescopic blocks (51) are arranged in an array, and the inclined surface (511) is unidirectional; The slider (32) has a mounting groove (322) corresponding to the tension spring (35), and a movable block (323) is installed in the mounting groove (322). The movable block (323) is connected to the tension spring (35).

2. The sewing machine bushing anti-dislodgement and multi-stage elastic locking and limiting device according to claim 1, characterized in that: The limiting block (33) has a wedge-shaped surface (331) below it, the outer shell (1) has a limiting groove (11) arrayed at the corresponding sliding groove (31), and the side wall of the sliding plate (36) is equipped with a locking block (6) at the corresponding limiting groove (11).

3. The sewing machine bushing anti-dislodgement and multi-stage elastic locking and limiting device according to claim 2, characterized in that: The slider (32) has a slope (321) on one side of the wedge surface (331), and the slope (321) has the same slope as the wedge surface (331).

4. The sewing machine bushing anti-dislodgement and multi-stage elastic locking and limiting device according to claim 1, characterized in that: The inner wall of the outer shell (1) has a ring array of buffer springs (12), the buffer springs (12) are located at the mounting ring (2), and a plate (7) is installed on the side of the buffer springs (12) away from the outer shell (1).

5. The sewing machine bushing anti-dislodgement and multi-stage elastic locking and limiting device according to claim 4, characterized in that: After the bushing body (P) is installed, the diameter of the circle formed by the center line of the patch (7) is smaller than the inner diameter of the outer shell (1), and the number of buffer springs (12) on the back of a single patch (7) is two or more.

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