Sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device

Abstract

The invention relates to the technical field of sewing machine parts, in particular to a sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device which comprises a shell, a mounting ring, a limiting mechanism, a clamping plate and an adjusting mechanism, the shell is mounted on the outer side of a shaft sleeve body, and the mounting ring is mounted in the shell; the limiting mechanism is installed on a shaft sleeve body in the shell, the clamping plate is located on the outer side of the shell, the adjusting mechanism is installed on the outer side of the shell, multi-stage elastic limiting is formed on an installation part in an automatic locking mode after the shaft sleeve is installed, and meanwhile deflection compensation is formed on the shaft sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machine parts, in particular to a sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device. Background Art

[0002] The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limit device is a mechanical device used in the sewing machine transmission system. It is mainly used to prevent the shaft sleeve from falling off during high-speed operation, and to achieve precise limiting and control of the shaft sleeve position through a multi-stage elastic clamping structure.

[0003] The existing technology usually adopts a fixed locking method to fix the sleeve. Due to the high-speed rotation of the shaft in the sleeve, on the one hand, under long-term rotation of the shaft, the shaft will come into contact with the sleeve, causing the sleeve itself to loosen. The looseness will be transmitted to the fixed installation of the sleeve itself, causing the installation to separate, and then causing the sleeve to fall off; on the other hand, under long-term use, the sleeve will wear. At this time, if the sleeve is still kept in a fixed state, the wear of the sleeve by the shaft will continue to increase, and the friction resistance of the sleeve will also hinder the shaft, thereby affecting the normal operation of the shaft.

[0004] In the prior art, there is a method of using elastic clamping based on a certain installation space of the sleeve, and then using multiple anti-falling methods to prevent the sleeve from loosening and falling off when the sleeve is deflected. At the same time, elasticity is used to achieve multi-position adjustment of the sleeve. However, it is aimed at sleeves of conventional sizes. Since the sizes of multiple sleeves on the sewing machine main shaft are not completely consistent, based on their different functions, the required sleeve types are also different, such as transmission sleeves that withstand large torques, support sleeves that play a radial support role, and guide sleeves for guiding wires or fabrics. Therefore, conventional elastic limiting devices are difficult to install different sleeves, and targeted designs need to be made for different sleeves. At the same time, when the shaft drives the sleeve to tilt, different elastic limiting devices are difficult to adjust uniformly, which affects the limit of the sewing machine sleeve 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 sleeve due to different sizes when installing sleeves at different positions of the same rotating shaft, the present invention designs a sewing machine sleeve anti-falling and multi-stage elastic clamping limit device. Summary of the Invention

[0006] The present invention provides a sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limit device, which solves the problem of difficulty in balancing the installation balance and adaptability of each shaft sleeve due to different sizes when installing shaft sleeves at different positions of the same rotating shaft. By automatically locking the shaft sleeve after installation, multi-stage elastic limit is formed on the installation position, and at the same time, deflection compensation is formed for the shaft sleeve.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a sewing machine shaft sleeve anti-dropout and multi-stage elastic clamping limit device, comprising a housing, a mounting ring, a limit mechanism, a clamping plate, and an adjustment mechanism. The housing is mounted on the outside of the shaft sleeve body, the mounting ring is mounted inside the housing, the limit mechanism is mounted on the shaft sleeve body within the housing, the clamping plate is located outside the housing, and the adjustment mechanism is mounted outside the housing. The limit mechanism locks the shaft sleeve body via the mounting ring, and the limit mechanism drives the adjustment mechanism to fix the housing while compensating for the deflection of the shaft sleeve body. During the installation of the shaft sleeve body, the shaft sleeve body is first fixed by the housing, and then the housing is limited, thereby enabling the housing to achieve multi-stage elastic clamping, thereby improving the adaptability of the shaft sleeve body installation.

[0009] Preferably, the limiting mechanism includes a slide groove, a slider, a limiting block, a return spring, a tension spring, and a slide plate. The slide groove is provided on the housing, the limiting block is installed in the slide groove, the limiting block is installed in the notch on the slider, a return spring is installed between the limiting block and the slider, the tension spring is installed between the slide plate and the housing, the slide plate is installed on the side of the slider away from the limiting block, and the slide plate slides above the slide groove. When the shaft sleeve body is installed in the housing, it will first directly press against the mounting ring. During the sliding process of the shaft sleeve body, the slider moves up and down at the same time, cooperating with the mounting ring to initially limit the shaft sleeve body.

[0010] Preferably, the adjustment mechanism includes a telescopic block, a compression spring, and a snap ring. The telescopic block is mounted on the back of the slide, the compression spring is mounted between the telescopic block and the slide, the snap plate is mounted on the outside of the housing, and the snap ring is movably mounted on the outside of the housing. A hard spring is connected between the snap ring and the snap plate. The slide acts as a limiter on the snap ring. When the slide moves rightward under the action of the slider, it drives the snap ring to move initially rightward, thereby performing a preliminary self-test of the snap ring and the hard spring to avoid problems such as the snap ring getting stuck or the hard spring failing. The snap ring and the snap plate then lock the housing, thereby achieving a multi-stage elastic snap connection.

[0011] Preferably, a slope is provided on the top of the telescopic block, the telescopic blocks are arranged in an array, and the slope is arranged in one direction. The clamping ring will be progressively advanced layer by layer, and will also be restricted layer by layer by the telescopic block just passed, thereby realizing multi-level clamping.

[0012] Preferably, a wedge-shaped surface is provided below the limit block, and a limit groove is provided in an array on the housing at locations corresponding to the slide grooves, and a locking block is installed on the sidewall of the slide at locations corresponding to the limit grooves. The wedge-shaped surface facilitates movement of the sleeve body and installation of the sleeve body. After the sleeve body is installed, the downward movement of the slide will drive the locking block to engage with the limit groove, thereby locking the slide and the slide. After the slide is locked, the slide drives the limit block to synchronously lock the sleeve body, thereby improving the sleeve body's anti-falling effect.

[0013] Preferably, the slider is provided with a sloped surface on the side corresponding to the inclined surface, and the sloped surface has the same slope as the wedge-shaped surface. Since the sloped surface has the same slope as the wedge-shaped surface, the distance the sloped surface 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 the sleeve installation.

[0014] Preferably, the slider has a receiving groove at a position corresponding to the tension spring, and a movable block is mounted in the receiving groove, wherein the movable block is connected to the tension spring. By providing the receiving groove and the movable block, when the slider moves up or down, the tension spring is always flush with the movable block, and the movable block slides up and down in the receiving groove, thereby maintaining the stability of the tension spring and the slider.

[0015] Preferably, a buffer spring is provided in an annular array on the inner wall of the housing. The buffer spring is located on the mounting ring, and a contact plate is mounted on the side of the buffer spring facing away from the housing. The buffer spring drives the contact plate to compensate for the shaft sleeve body, thereby providing a buffer for the shaft sleeve body and preventing hard contact between the shaft sleeve body and the rotating shaft. This reduces wear on the shaft sleeve body and friction between the shaft sleeve and the rotating shaft, thereby preventing 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 sleeve body to pass smoothly, avoiding the mounting plate from hindering the installation of the sleeve body, and the through hole further improves the heat dissipation effect of the sleeve body.

[0017] Preferably, after the sleeve body is installed, the diameter of the circle formed by the midpoints of the plates is smaller than the inner diameter of the housing, and the number of buffer springs on the back of each plate is two or more. A margin is provided between the plates and the housing, and the buffer springs allow the sleeve body to partially adjust when the shaft deflects, thereby improving the sleeve's adaptability to shaft changes.

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

[0019] 1. The present invention proposes a sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device. During the installation of the shaft sleeve body, the shaft sleeve body is first fixed by the outer shell, and then the outer shell is limited, so that the outer shell can achieve multi-stage elastic clamping. When the shaft sleeve body shakes and loosens due to the high-speed rotation of the shaft, the limiting mechanism and the adjusting mechanism cooperate with each other to lock the shaft sleeve body and the outer shell layer by layer, thereby ensuring that the shaft sleeve body will not easily separate from the outer shell. At the same time, it can also adapt to the fixation and installation of different shaft sleeve bodies, thereby improving the adaptability of the installation of the shaft sleeve body.

[0020] 2. The present invention proposes a sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limit device. In the initial state, the slide plate restricts the clamping ring. When the slide plate is moved to the right by the slider, the clamping ring will be driven to move initially to the right, thereby realizing a preliminary self-inspection of the clamping ring and the hard spring, avoiding problems such as the clamping ring being stuck or the hard spring failing. After confirmation, the clamping ring and the clamping plate are aligned with the place where the installation is required, and the end face of the clamping plate is in contact with the installation side, and the slide plate is squeezed downward. At this time, the slider will further limit the shaft sleeve body, thereby realizing the locking of the shaft sleeve; and in the process of the slide plate moving downward, the restriction of the slide plate on the clamping ring is also released, and the clamping ring will be stretched by the hard spring to fit the clamping plate, and then the outer shell is locked by the clamping ring and the clamping plate. During the movement, the clamping ring will gradually push the telescopic block, and the telescopic block squeezes the compression spring, thereby realizing multi-stage elastic clamping, thereby improving the convenience of installation of the shaft sleeve.

[0021] 3. The present invention proposes a sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limit device, which squeezes the limit block through the wedge surface, so that the limit block squeezes the reset spring, and at the same time leaves space for the shaft sleeve body to move forward, thereby facilitating the installation of the shaft sleeve body. After the shaft sleeve body is installed, the slide plate moves downward to drive the locking block to embed into the limit groove, thereby realizing the locking of the slide plate and the slider. After the slider is locked, the slider drives the limit block to synchronously lock the shaft sleeve body, and then locks the shaft sleeve body through the locking of the outer shell, thereby improving the anti-falling effect of the shaft sleeve body; at the same time, the clamping ring will form a constraint and fixation on the outer shell between the clamping plate, and the clamping ring is blocked by the back side of the inclined surface on the telescopic block, thereby realizing elastic limitation of the clamping ring, thereby realizing multi-stage elastic limitation of the shaft sleeve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation or the description of the prior art. Obviously, the drawings described below are an implementation of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

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

[0026] Figure 4 is a schematic diagram of the adjustment 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 structural diagram of the board attachment portion of the present invention;

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

[0030] Figure 8 It 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 figure: P, sleeve body; 1, outer shell; 11, limit groove; 12, buffer spring; 2, mounting ring; 3, limit mechanism; 31, slide groove; 32, slider; 321, slope; 322, placement groove; 323, movable block; 33, limit block; 331, wedge surface; 34, return spring; 35, tension spring; 36, slide plate; 4, clamping plate; 5, adjustment mechanism; 51, telescopic block; 511, inclined surface; 52, compression spring; 54, clamping ring; 55, hard spring; 6, locking block; 7, sticking plate. DETAILED DESCRIPTION

[0033] In order to better understand the above solution, the above technical solution is described in detail below with reference to the accompanying drawings and specific implementation methods.

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

[0035] When the sleeve body P is installed, the sleeve slides inward along the outer shell 1 until it reaches the mounting ring 2. One end of the sleeve body P fits against the mounting ring 2. When the sleeve body P is installed, the limiting mechanism 3 is driven to elastically limit the sleeve body P. At the same time, the clamping plate 4 is also clamped to the outside end. At this time, the adjusting mechanism 5 drives the clamping plate 4 to move horizontally, thereby driving the clamping plate 4 to lock the outer shell 1, thereby preventing the outer shell 1 from detaching and further preventing the sleeve body P from detaching.

[0036] During the installation of the sleeve body P, the sleeve 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 clamping. When the sleeve 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 make the sleeve body P and the outer shell 1 locked layer by layer, thereby ensuring that the sleeve body P will not easily detach from the outer shell 1. At the same time, it can also adapt to the fixation and installation of different sleeve bodies P, thereby improving the adaptability of the installation of the sleeve body P.

[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 slide plate 36. The slide groove 31 is opened on the shell 1, and the limiting block 33 is installed in the slide groove 31. The limiting block 33 is installed at the notch on the slider 32. A return spring 34 is installed between the limiting block 33 and the slider 32. The tension spring 35 is installed between the slide plate 36 and the shell 1. The slide plate 36 is installed on the side of the slider 32 away from the limiting block 33. The slide plate 36 slides above the slide groove 31.

[0038] When the sleeve body P is installed in the housing 1, it will first be directly pressed against the mounting ring 2. During the sliding process of the sleeve body P, it will pass through the slider 32 and the limit block 33 in the slide groove 31, which will drive the limit block 33 and the slider 32 to move upward synchronously. At this time, the limit block 33 will squeeze the return spring 34, and then the limit block 33 will enter the groove on the surface of the slider 32. The sleeve body P will pass over the limit block 33 and reach the right end of the limit 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 limit block 33 will be located on the left side of the sleeve body P, and then cooperate with the mounting ring 2 to perform a preliminary limit on the sleeve body P, and synchronously 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 36, the compression spring 52 is installed between the telescopic block 51 and the slide 36, the retaining plate 4 is installed on the outside of the shell 1, and the retaining ring 54 is movably installed on the outside of the shell 1. A hard spring 55 is connected between the retaining ring 54 and the retaining plate 4.

[0040] The back of the slide 36 is equipped with a telescopic block 51 through a compression spring 52. In the initial state, the slide 36 restricts the snap ring 54. When the slide 36 is moved to the right by the slider 32, the snap ring 54 is initially driven to move to the right, thereby realizing a preliminary self-check of the snap ring 54 and the hard spring 55 to avoid problems such as the snap ring 54 being stuck or the hard spring 55 failing. After confirming that everything is correct, align the snap ring 54 with the card plate 4 where it needs to be installed, and install the card plate 4 facing the end face of the snap ring 54. On the other hand, by squeezing the slide plate 36 downward, the slider 32 will further limit the sleeve body P, thereby achieving the locking of the sleeve; and in the process of the slide plate 36 moving downward, the restriction of the slide plate 36 on the retaining ring 54 is also released, and then the retaining ring 54 will be stretched by the hard spring 55 to fit the card plate 4, and then the housing 1 is locked through the retaining ring 54 and the card 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 clamping.

[0041] like Figure 8 As shown, an inclined surface 511 is provided on the top of 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 block 51 it has just passed, thereby realizing multi-level clamping. The inclined surface 511 is used to reduce resistance when the retaining ring 54 moves toward the clamping plate 4, so that the retaining ring 54 can quickly pass over the telescopic block 51, thereby realizing the installation of the sleeve body P.

[0043] like Figure 2 、 3 As shown in Figures 8 and 9, a wedge-shaped surface 331 is provided below the limit block 33, and a limit groove 11 is provided in an array at positions of the housing 1 corresponding to the slide groove 31, and a locking block 6 is installed at positions of the side wall of the slide plate 36 corresponding to the limit groove 11.

[0044] The wedge-shaped surface 331 facilitates the movement of the sleeve body P, so that when the sleeve body P moves toward the mounting ring 2, the limit block 33 can be squeezed by the wedge-shaped surface 331, so that the limit block 33 squeezes the return spring 34, leaving space for the sleeve body P to move forward, thereby facilitating the installation of the sleeve body P. After the sleeve body P is installed, the slide plate 36 moves downward to drive the locking block 6 to embed into the limit groove 11, thereby achieving the locking of the slide plate 36 and the slider 32. After the slider 32 is locked, the slider 32 drives the limit block 33 to lock the sleeve body P synchronously, and then locks the sleeve body P through the locking of the shell 1, thereby improving the anti-falling effect of the sleeve body P; at the same time, the snap ring 54 will form a constraint and fixation on the shell 1 between the card plate 4, and the snap ring 54 is blocked by the back of the inclined surface 511 on the telescopic block 51, thereby achieving elastic limitation of the snap ring 54, thereby achieving multi-stage elastic limitation of the sleeve body P.

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

[0046] When the sleeve body P pushes the limit 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 the slope 321 moves upward per unit time is equal to the distance the limit block 33 moves upward, thereby pushing the slider 32 and the slide plate 36 to rise, realizing the function of automatic adjustment and installation, and further improving the convenience of sleeve installation.

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

[0048] The placement groove 322 and the movable block 323 are designed to prevent the upward movement of the slider 32 from conflicting with the lateral movement of the tension spring 35. Because the tension spring 35 generally expands and contracts along the moving direction of the spring, and the slider 32 will have a movement perpendicular to the tension direction of the tension spring 35, the placement groove 322 and the movable block 323 are provided. When the slider 32 moves up or down, the tension spring 35 is always flush with the movable block 323, and the movable block 323 slides up and down in the placement 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 housing 1 is provided with a buffer spring 12 in an annular array. The buffer spring 12 is located at the mounting ring 2 , and a mounting plate 7 is installed on the side of the buffer spring 1 facing away from the housing 1 .

[0050] After the installation of the sleeve body P is completed, the plate 7 is in contact with the sleeve body P, and the annular array of plates 7 can buffer and compensate for position deviation of the sleeve body P under the action of the buffer spring 12. When the position of the sleeve body P is deflected, the buffer spring 12 can drive the plate 7 to compensate for the sleeve body P, thereby forming a buffer for the sleeve body P, avoiding hard contact between the sleeve body P and the rotating shaft, reducing the wear on the sleeve body P on the one hand, and reducing the friction of the sleeve on the rotating shaft on the other hand, thereby avoiding interference with the normal operation of the rotating shaft.

[0051] The mounting plate 7 is provided with a mounting surface on a side facing away from the mounting ring 2 , and a through hole is opened on the surface of the mounting plate 7 .

[0052] The mounting surface allows the sleeve body P to pass smoothly, preventing the plate 7 from hindering the installation of the sleeve body P. It can also position the sleeve. The plate 7 can transform the annular connection around the sleeve body P into a line contact, thereby improving the heat dissipation effect of the sleeve body P. The through hole further improves the heat dissipation effect of the sleeve body P.

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

[0054] There is a margin between the plate 7 and the shell 1. Under the action of the buffer spring 12, the sleeve body P can undergo local adjustment when the shaft is deflected. By setting the number of buffer springs 12 on the back of a single plate 7 to be multiple, the sleeve can be tilted along the tilt direction of the shaft, and the plate 7 can be tilted, 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 sleeve to changes in the shaft.

[0055] When the shaft sleeve body P needs to be installed, the staff takes out the device and inserts the shaft sleeve body P into the housing 1 from the left side. The shaft sleeve slides to the right, which pushes the slider 32 and the limit block 33 to move upward, and then pushes the annular array plate 7. The plate 7 of the synchronous annular array forms a limit on the four sides of the shaft sleeve under the action of the buffer spring 12 until the shaft sleeve slides to the mounting ring 2. The shaft sleeve body P passes over the limit block 33 and reaches the right end of the limit block 33. The limit block 33 forms a limit on the left side of the shaft sleeve, and then cooperates with the plate 7 and the mounting ring 2 to achieve a locking and anti-falling effect on the shaft sleeve body P.

[0056] When the slider 32 is in the sliding groove 31 and the limit block 33 is passed, the limit block 33 and the slider 32 will move upward synchronously. At this time, the limit block 33 will squeeze the return spring 34, and then the limit block 33 will enter the groove on the surface of the slider 32. When the slider 32 moves upward, the limit block 33 will be located on the left side of the sleeve body P, and then cooperate with the mounting ring 2 to perform a preliminary limit on the sleeve body P. After the slider 32 contacts the restriction of the 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 installed 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 block 32 moves to the right, it will drive the snap ring 54 to move to the right initially. At this time, the staff will align the snap ring 54 with the card plate 4 where they need to be installed. The card plate 4 is facing the end face of the snap ring 54 and fits the installation side. By squeezing the slide plate 36 downward, the slider 32 will further limit the sleeve body P, thereby achieving the locking of the sleeve; and in the process of the slide plate 36 moving downward, the restriction of the slide plate 36 on the snap ring 54 is also released, and then the snap ring 54 will be stretched by the hard spring 55 to fit the card plate 4, and then the housing 1 is locked through the snap ring 54 and the card plate 4. During the movement, the snap 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 clamping.

[0057] The above shows and describes the basic principles and beneficial effects of the present invention. At the same time, the present invention is not limited to the above embodiments. Without departing from the effects and scope of the present invention, the present invention may have various changes and improvements. These changes and improvements all fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limit device, installed on the sewing machine shaft sleeve, characterized by: The invention comprises a housing (1), a mounting ring (2), a limiting mechanism (3), a clamping plate (4), and an adjusting mechanism (5), wherein the housing (1) is mounted on the outside of the shaft sleeve body (P), the mounting ring (2) is mounted inside the housing (1), the limiting mechanism (3) is mounted on the shaft sleeve body (P) inside the housing (1), the clamping plate (4) is located outside the housing (1), and the adjusting mechanism (5) is mounted on the outside of the housing (1), the limiting mechanism (3) locks the shaft sleeve 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 deflection of the shaft sleeve body (P).

2. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 1, characterized in that: 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 slide plate (36). The slide groove (31) is opened on the housing (1), the limiting block (33) is installed in the slide groove (31), the limiting block (33) is installed at the notch on the slider (32), a return spring (34) is installed between the limiting block (33) and the slider (32), the slide 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 slide plate (36) and the housing (1), and the slide plate (36) is located above the slide groove (31) and slides.

3. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 2, characterized in that: The adjusting mechanism (5) comprises a telescopic block (51), a compression spring (52), and a snap ring (54); the telescopic block (51) is mounted on the back of the slide (36); the compression spring (52) is mounted between the telescopic block (51) and the slide (36); the snap plate (4) is mounted on the outside of the housing (1); the snap ring (54) is movably mounted on the outside of the housing (1); and a hard spring (55) is connected between the snap ring (54) and the snap plate (4).

4. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 3, characterized in that: An inclined surface (511) is provided above the telescopic blocks (51), the telescopic blocks (51) are arranged in an array, and the inclined surface (511) is provided in a unidirectional manner.

5. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 3, characterized in that: A wedge-shaped surface (331) is provided below the limit block (33), and a limit groove (11) is provided in an array at a position of the housing (1) corresponding to the slide groove (31), and a locking block (6) is installed at a position of the side wall of the slide plate (36) corresponding to the limit groove (11).

6. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 5, characterized in that: A slope surface (321) is provided on one side of the slider (32) corresponding to the wedge surface (331), and the slope surface (321) has the same slope as the wedge surface (331).

7. The sewing machine shaft sleeve anti-dropping and multi-stage elastic clamping limiting device according to claim 6, characterized in that: The slider (32) is provided with a placement groove (322) corresponding to the tension spring (35), and a movable block (323) is installed in the placement groove (322), and the movable block (323) is connected to the tension spring (35).

8. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 7, characterized in that: The inner wall of the housing (1) is provided with a buffer spring (12) in an annular array. The buffer spring (12) is located at the mounting ring (2). A mounting plate (7) is installed on the side of the buffer spring (12) facing away from the housing (1).

9. The sewing machine shaft sleeve anti-falling and multi-stage elastic clamping limiting device according to claim 8, characterized in that: After the sleeve body (P) is installed, the diameter of the circle formed by the center line of the plate (7) is smaller than the inner diameter of the shell (1), and the number of the buffer springs (12) on the back of a single plate (7) is two or more.

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