Gear adjusting mechanism of clamping device and sewing machine

Abstract

The utility model discloses a gear adjusting mechanism of a clamping device and a sewing machine, and belongs to the technical field of sewing machines. The adjusting rotating shaft is mounted on one side of the rack; the preset gear wheel is mounted on the adjusting rotating shaft, and a preset gear section and an adjusting matching section are formed on the working surface of the preset gear wheel; the adjusting hand wheel is installed at one end of the rack and fixedly connected with one end of the adjusting rotating shaft, and the adjusting hand wheel has a rotating state capable of driving the adjusting rotating shaft to rotate and a static state capable of enabling the adjusting rotating shaft to be fixedly connected with the rack. The cam transmission mode is adopted, and gear adjustment of the thread trapper on the thread clamping force is achieved.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a clamping gear adjustment mechanism and a sewing machine. Background Technology

[0002] Existing sewing machines use a thread clamp (with a built-in spring providing elastic pressure) to grip the thread, creating tension at the other end of the thread as it's sewn onto the fabric, resulting in neat stitches. However, in actual sewing, different fabrics require different tension levels, necessitating manual adjustment of the thread clamp's tightness.

[0003] To accommodate the tension requirements of sewing different fabrics, the existing thread clamps have a wide range of adjustable thread insertion length. When changing to different fabrics, it is necessary to repeatedly experiment and make multiple adjustments until a neat stitch is achieved. In particular, when changing to fabrics with a wide range of characteristics, a lot of time is required to try and adjust the clamping degree, which is not only inefficient but also requires a high level of experience from the adjustment personnel.

[0004] Patent document CN216075297U discloses a double-row thread clamping device. This device has a first thread clamp and a second thread clamp mounted on a base plate. By controlling the first and second thread clamps to apply different clamping forces sequentially to the thread, different sewing stitch requirements can be achieved. It has been proposed that, based on this, if the first thread clamp can be automatically controlled to apply corresponding clamping forces to different fabrics, and the clamping force can be adjusted in different positions, both positional and free adjustment of the thread clamping force can be achieved simultaneously, thereby improving the efficiency of thread clamping force adjustment.

[0005] Therefore, how to achieve the adjustment of the clamp's gear position has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of this utility model is to provide a clamping gear adjustment mechanism to address the above-mentioned technical problems.

[0007] The technical solution adopted by this utility model is: a clamping device gear adjustment mechanism, comprising:

[0008] frame;

[0009] An adjusting shaft is mounted on one side of the frame;

[0010] A preset gear wheel is mounted on an adjusting shaft, and a preset gear segment and an adjusting engagement segment are formed on the working surface of the preset gear wheel;

[0011] An adjusting handwheel is mounted on one end of the frame and fixedly connected to one end of the adjusting shaft. The adjusting handwheel has a rotating state that can drive the adjusting shaft to rotate and a stationary state that fixes the adjusting shaft to the frame.

[0012] Preferably, the preset gear wheel is coaxially mounted on the adjusting shaft, the preset gear segment and the adjusting mating segment are formed on the outer circumferential surface of the preset gear wheel, and the radial dimension of the preset gear segment is smaller than the radial dimension of the adjusting mating segment.

[0013] Preferably, there are multiple preset gear segments, and the multiple preset gear segments are arranged sequentially along the rotation direction of the adjustment shaft.

[0014] Preferably, a free adjustment wheel is installed on the adjustment shaft, and a free adjustment section and a gear matching section are formed on the working surface of the free adjustment wheel. The free adjustment section corresponds to the adjustment matching section, and the gear matching section corresponds to the preset gear section.

[0015] Preferably, a free adjustment wheel is coaxially mounted on the adjustment shaft, the free adjustment section and the gear engagement section are formed on the outer circumferential surface of the free adjustment wheel, and the radial dimension of the free adjustment section is smaller than the radial dimension of the gear engagement section.

[0016] Preferably, a free adjustment wheel is coaxially mounted on the adjustment shaft, the free adjustment section and the gear engagement section are formed on the end face of the free adjustment wheel, and the axial distance between the free adjustment section and the preset gear wheel is less than the axial distance between the gear engagement section and the preset gear wheel.

[0017] Preferably, the adjusting handwheel includes a baffle, a handwheel, a limiting ball, a damping spring, and a plug. The baffle is coaxially sleeved on the adjusting shaft and fixedly connected to the frame. Multiple position grooves are distributed circumferentially on the baffle. The handwheel is fixedly connected to one end of the adjusting shaft. An axial through hole is formed on the handwheel. The plug is fixedly installed at one end of the axial through hole. The limiting ball is housed at the other end of the axial through hole. The damping spring is housed in the axial through hole. One end of the damping spring abuts against the plug, and the other end of the damping spring abuts against the limiting ball.

[0018] Preferably, the axial spacing of the plurality of preset gear wheels is set.

[0019] The second objective of this invention is to provide a sewing machine that includes the aforementioned clamping gear adjustment mechanism.

[0020] The beneficial effects of this utility model are:

[0021] This invention features a preset gear wheel mounted on an adjusting shaft. A preset gear section and an adjustment engagement section are formed on the working surface where the preset gear wheel abuts against the mounting mandrel of the thread clamp. An adjusting handwheel, installed between the frame and the adjusting shaft, drives the adjusting shaft to rotate. This causes the preset gear section of the preset gear wheel and the adjustment engagement section to abut against the mounting mandrel of the thread clamp, allowing the mounting mandrel to move a predetermined displacement along its axis, thereby adjusting the clamping force of the thread clamp on the sewing thread. Attached Figure Description

[0022] Figure 1 This is one of the structural schematic diagrams of the clamping gear adjustment mechanism of this utility model;

[0023] Figure 2 This is the second schematic diagram of the clamping gear adjustment mechanism of this utility model;

[0024] Figure 3 This is the third schematic diagram of the clamping gear adjustment mechanism of this utility model;

[0025] Figure 4 A diagram showing the positional relationship between the outer circumference of the preset gear wheel and the outer circumference of the free adjustment wheel;

[0026] Figure 5 A diagram showing the positional relationship between the outer circumference of the preset gear wheel and the end face of the free adjustment wheel;

[0027] Figure 6 A 3D schematic diagram of the preset gear wheel;

[0028] Figure 7 This is one of the three-dimensional schematic diagrams of the freely adjustable wheel;

[0029] Figure 8 This is the second three-dimensional schematic diagram of the freely adjustable wheel.

[0030] Explanation of the reference numerals in the figure:

[0031] 10. Rack;

[0032] 20. Adjust the shaft;

[0033] 30. Preset gear wheel; 31. Preset gear range; 31a. First gear range; 31b. Second gear range; 31c. Third gear range; 32. Adjustment and fitting section; 33. Installation section;

[0034] 40. Adjust the handwheel;

[0035] 41. Baffle; 42. Handwheel; 43. Limit ball; 44. Damping spring; 45. Plug; 46. Gear slot; 47. Axial through hole;

[0036] 50. Adjustable wheel; 51. Adjustable section; 52. Gear shift section. Detailed Implementation

[0037] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0038] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0041] As is well known, a clamping plate used to apply clamping force to the suture is fitted onto a mounting mandrel. A knob is installed at the end of the mounting mandrel, and a spring is installed between the clamping plate and the knob. The elastic deformation of the spring applies pressure to the clamping plate, thereby adjusting the suture clamping force. In other words, the magnitude of the suture clamping force is directly related to the distance between the knob and the clamping plate. Therefore, by controlling the mounting mandrel to move a predetermined distance along the axial direction, the clamping force applied to the suture by the suture clamp can be controlled to a preset magnitude, thereby achieving the adjustment of the clamping force level of the suture clamp.

[0042] Examples, such as Figures 1-8 As shown, a clamping device gear adjustment mechanism includes: a frame 10, an adjustment shaft 20, a preset gear wheel 30, and an adjustment handwheel 40.

[0043] The adjustment shaft 20 is installed on one side of the frame 10 and is rotatably connected to the frame 10.

[0044] The preset gear wheel 30 is mounted on the adjusting shaft 20, and the working surface of the preset gear wheel 30 is formed with a preset gear section 31 and an adjusting section 32 that cooperate with the mounting mandrel of the wire clamp and are used to drive the mounting mandrel to move axially.

[0045] The adjusting handwheel 40 is installed at one end of the frame 10 and is fixedly connected to one end of the adjusting shaft 20. The adjusting handwheel 40 has a rotating state that can drive the adjusting shaft 20 to rotate and a stationary state that fixes the adjusting shaft 20 to the frame 10.

[0046] This invention features a preset gear wheel 30 mounted on an adjusting shaft 20. A preset gear section 31 and an adjusting engagement section 32 are formed on the working surface of the preset gear wheel 30 that abuts against the mounting mandrel of the thread clamp. An adjusting handwheel 40 is installed between the frame 10 and the adjusting shaft 20. The adjusting handwheel 40 can drive the adjusting shaft 20 to rotate, causing the preset gear section 31 and the adjusting engagement section 32 of the preset gear wheel 30 to abut against the mounting mandrel of the thread clamp in sequence. This allows the mounting mandrel to move a predetermined displacement along the axial direction, thereby realizing the adjustment of the clamping force of the thread clamp on the sewing thread.

[0047] Specific embodiment 1, such as Figure 1 , Figure 2 and Figure 5 As shown, a clamping device gear adjustment mechanism includes: a frame 10, an adjustment shaft 20, a preset gear wheel 30, and an adjustment handwheel 40.

[0048] The frame 10 is set horizontally in the transverse direction.

[0049] The adjusting shaft 20 is installed on one side of the frame 10, and both ends of the adjusting shaft 20 are rotatably connected to the frame 10 through bearings.

[0050] The preset gear wheel 30 is mounted on the adjusting shaft 20, and a preset gear section 31 and an adjusting mating section 32 are formed on the working surface of the preset gear wheel 30. The radial dimension of the preset gear section 31 is smaller than the radial dimension of the adjusting mating section 32.

[0051] The adjusting handwheel 40 is installed at one end of the frame 10 and is fixedly connected to one end of the adjusting shaft 20. The adjusting handwheel 40 has a rotating state that can drive the adjusting shaft 20 to rotate and a stationary state that fixes the adjusting shaft 20 to the frame 10. That is, when the adjusting handwheel 40 is in the rotating state, the adjusting shaft 20 can be driven to rotate by rotating the adjusting handwheel 40, thereby changing the preset gear wheel 30 from the preset gear section 31 abutting against the mounting core of the wire clamp to the adjusting mating section 32 abutting against the mounting core of the wire clamp, or changing the preset gear wheel 30 from the adjusting mating section 32 abutting against the mounting core of the wire clamp to the preset gear section 31 abutting against the mounting core of the wire clamp. When the adjusting handwheel 40 is in the stationary state, the adjusting shaft 20 is fixedly connected to the frame 10 through the adjusting handwheel 40, and the adjusting shaft 20 cannot rotate.

[0052] It should be noted that the adjusting handwheel 40 can adopt any mechanical structure that enables the adjusting shaft 20 to be fixedly connected to and rotate relative to the frame 10. The following is only an example, and one of them will be described in detail:

[0053] like Figure 1 As shown, the adjusting handwheel 40 includes a baffle 41, a handwheel 42, a limit ball 43, a damping spring 44, and a plug 45; the baffle 41 is located at one end of the frame 10, and the baffle 41 is coaxially sleeved on the adjusting shaft 20. The baffle 41 is fixedly connected to the frame 10, for example, by screw connection.

[0054] Multiple gear slots 46 are formed on the baffle 41, and the multiple gear slots 46 are circumferentially distributed around the axis of the adjusting shaft 20; the handwheel 42 is fixedly connected to one end of the adjusting shaft 20, and an axial through hole 47 that mates with the gear slot 46 is formed on the handwheel 42; the plug 45 is fixedly installed in the axial through hole 47, and the plug 45 is located at the end of the handwheel 42 away from the baffle 41; the limiting ball 43 is housed in the axial through hole 47, and the limiting ball 43 is located at the end of the handwheel 42 closer to the baffle 41; the damping spring 44 is housed in the axial through hole 47, and one end of the damping spring 44 abuts against the plug 45, providing damping. The other end of the spring 44 abuts against the limiting ball 43 so that when the axial through hole 47 is aligned with the gear slot 46, the limiting ball 43 can enter the gear slot 46 under the action of the damping spring 44, thereby changing the adjusting handwheel 40 from a rotating state to a stationary state, that is, fixing the adjusting handwheel 40 to the frame 10. When the operator rotates the handwheel 42 with force, the limiting ball 43 will compress the damping spring 44 under the action of external force, thereby causing the limiting ball 43 to enter the axial through hole 47 from the gear slot 46, causing the adjusting handwheel 40 to change from a stationary state to a rotating state, that is, the adjusting handwheel 40 and the frame 10 can rotate relative to each other.

[0055] Specific embodiment 2, such as Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, a clamping device gear adjustment mechanism includes: a frame 10, an adjustment shaft 20, a preset gear wheel 30, an adjustment handwheel 40, and a free adjustment wheel 50.

[0056] The adjusting shaft 20 is rotatably mounted on one side of the frame 10.

[0057] The number of preset gear wheels 30 is one or more, and the preset gear wheels 30 are coaxially mounted on the adjusting shaft 20. A preset gear section 31 and an adjusting fit section 32 are formed on the working surface of the preset gear wheel 30. That is, the preset gear section 31 and the adjusting fit section 32 are formed on the outer circumferential surface of the preset gear wheel 30, and the radial dimension of the preset gear section 31 is smaller than the radial dimension of the adjusting fit section 32.

[0058] The freely adjustable wheel 50 is coaxially mounted on the adjusting shaft 20. The freely adjustable wheel 50 is an end-face cam, and a freely adjustable section 51 and a gear engagement section 52 are formed on the working surface of the freely adjustable wheel 50. That is, the freely adjustable section 51 and the gear engagement section 52 are formed on the end face of the end-face cam. The freely adjustable section 51 and the gear engagement section 52 are connected end to end, and the axial dimensions of the end-face cams corresponding to the freely adjustable section 51 and the gear engagement section 52 are different; for example, in Figure 2 In this case, the axial dimension of the end face cam corresponding to the free adjustment section 51 is smaller than the axial dimension of the end face cam corresponding to the gear engagement section 52. That is, the axial distance between the free adjustment section 51 and the preset gear wheel 30 is smaller than the axial distance between the gear engagement section 52 and the preset gear wheel 30.

[0059] In the circumferential direction of the adjusting shaft 20, the free adjustment section 51 corresponds to the adjustment matching section 32, and the gear matching section 52 corresponds to the preset gear section 31.

[0060] The adjusting handwheel 40 is installed at one end of the frame 10 and is fixedly connected to one end of the adjusting shaft 20. The adjusting handwheel 40 has a rotating state that can drive the adjusting shaft 20 to rotate and a stationary state that fixes the adjusting shaft 20 to the frame 10.

[0061] Preferred, such as Figure 5As shown, on the outer circumferential surface of the preset gear wheel 30, there are multiple preset gear segments 31. For example, the preset gear segments 31 include a first gear segment 31a, a second gear segment 31b, and a third gear segment 31c. The first gear segment 31a, the second gear segment 31b, and the third gear segment 31c are arranged sequentially along the circumferential direction, and along the rotation direction of the adjusting shaft 20, the radial dimensions of the multiple preset gear segments 31 gradually increase, that is, the radial dimensions of the first gear segment 31a, the second gear segment 31b, and the third gear segment 31c gradually increase. One end of the adjusting fitting segment 32 is connected to one end of the third gear segment 31c, and the radial dimension of the adjusting fitting segment 32 is greater than the radial dimension of the third gear segment 31c. A mounting segment 33 is connected between the other end of the adjusting fitting segment 32 and the first gear segment 31a. A fastening screw is installed in the countersunk hole on the mounting segment 33 to fix the free adjusting wheel 50 to the adjusting shaft 20.

[0062] It should be noted that the preset gear wheel 30 may also be without the installation section 33, and the other end of the adjustment and mating section 32 may be directly connected to one end of the first gear section 31a.

[0063] Specific embodiment 3, such as Figure 3 , Figure 5 , Figure 6 and Figure 8 As shown, a clamping device gear adjustment mechanism includes: a frame 10, an adjustment shaft 20, a preset gear wheel 30, an adjustment handwheel 40, and a free adjustment wheel 50.

[0064] The adjusting shaft 20 is rotatably mounted on one side of the frame 10.

[0065] The preset gear wheel 30 is coaxially mounted on the adjusting shaft 20. There are multiple preset gear wheels 30, and the multiple preset gear wheels 30 are spaced apart along the axial direction of the adjusting shaft 20. A preset gear section 31 and an adjusting fit section 32 are formed on the working surface of the preset gear wheel 30. That is, the preset gear section 31 and the adjusting fit section 32 are formed on the outer circumferential surface of the preset gear wheel 30, and the radial dimension of the preset gear section 31 is smaller than the radial dimension of the adjusting fit section 32.

[0066] The free adjustment wheel 50 is coaxially mounted on the adjustment shaft 20. A free adjustment section 51 and a gear engagement section 52 are formed on the outer circumferential surface of the free adjustment wheel 50. The free adjustment section 51 and the gear engagement section 52 are connected end to end, and the radial dimension of the free adjustment section 51 is smaller than the radial dimension of the gear engagement section 52. In the circumferential direction of the adjustment shaft 20, the free adjustment section 51 corresponds to the adjustment engagement section 32, and the gear engagement section 52 corresponds to the preset gear section 31.

[0067] The adjusting handwheel 40 is installed at one end of the frame 10 and is fixedly connected to one end of the adjusting shaft 20. The adjusting handwheel 40 has a rotating state that can drive the adjusting shaft 20 to rotate and a stationary state that fixes the adjusting shaft 20 to the frame 10.

[0068] Preferred, such as Figure 6 As shown, on the outer circumferential surface of the preset gear wheel 30, there are multiple preset gear segments 31. For example, the preset gear segments 31 include a first gear segment 31a, a second gear segment 31b, and a third gear segment 31c. The first gear segment 31a, the second gear segment 31b, and the third gear segment 31c are arranged sequentially along the circumferential direction, and along the rotation direction of the adjusting shaft 20, the radial dimensions of the multiple preset gear segments 31 gradually increase, that is, the radial dimensions of the first gear segment 31a, the second gear segment 31b, and the third gear segment 31c gradually increase. One end of the adjusting fitting segment 32 is connected to one end of the third gear segment 31c, and the radial dimension of the adjusting fitting segment 32 is greater than the radial dimension of the third gear segment 31c. A mounting segment 33 is connected between the other end of the adjusting fitting segment 32 and the first gear segment 31a. A fastening screw is installed in the countersunk hole on the mounting segment 33 to fix the free adjusting wheel 50 to the adjusting shaft 20.

[0069] An example is a sewing machine that includes the gear adjustment mechanism described above.

[0070] The working process of the gear adjustment mechanism of this utility model is as follows:

[0071] When the operator forcefully rotates the handwheel 42, the limiting ball 43, under the action of external force, squeezes the damping spring 44, causing the limiting ball 43 to disengage from the gear slot 46 and enter the axial through hole 47 of the handwheel 42. The handwheel 42 then drives the adjusting shaft 20 to rotate. When the handwheel 42 rotates to the point where the axial through hole 47 is aligned with another gear slot 46, the limiting ball 43 enters the gear slot 46 under the action of the damping spring 44, thereby fixing the adjusting handwheel 40 to the frame 10.

[0072] During the rotation of the adjusting shaft 20, the working surface (outer circumferential surface) of the preset gear wheel 30 abuts against the mounting mandrel of the thread clamp. As the preset gear wheel 30 rotates, the first gear section 31a, the second gear section 31b, the third gear section 31c and the adjusting and mating section 32 on the preset gear wheel 30 successively contact the mounting mandrel. Due to the different radial dimensions, the axial displacement of the mounting mandrel will be different, thereby making the clamping force of the thread clamp on the sewing thread different, thus realizing the adjustment of the clamping force.

[0073] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A gear adjustment mechanism of a clamp, characterized by, The utility model relates to a kind of adjustable gear box, including: Rack (10); Adjusting shaft (20), the adjusting shaft (20) is installed to one side of rack (10); Pre-set gear wheel (30), the pre-set gear wheel (30) is installed on adjusting shaft (20), and pre-set gear segment (31) and adjusting cooperation section (32) are formed on the working surface of the pre-set gear wheel (30); Adjusting hand wheel (40), the adjusting hand wheel (40) is installed to one end of rack (10) and is fixedly connected with one end of adjusting shaft (20), the adjusting hand wheel (40) has the rotating state that can drive adjusting shaft (20) rotation and the stationary state of making adjusting shaft (20) and rack (10) fixed connection.

2. A gear adjustment mechanism for a clamp according to claim 1, wherein The pre-set gear wheel (30) is coaxially installed on adjusting shaft (20), the pre-set gear segment (31) and adjusting cooperation section (32) are formed on the outer circumferential surface of pre-set gear wheel (30), and the radial dimension of the pre-set gear segment (31) is less than the radial dimension of adjusting cooperation section (32).

3. A gear adjustment mechanism for a clamp according to claim 2, wherein The number of the pre-set gear segment (31) is multiple, and multiple pre-set gear segments (31) are sequentially arranged along the rotating direction of the adjusting shaft (20).

4. A gear adjustment mechanism for a clamp according to any one of claims 1 to 3, wherein The free adjusting wheel (50) is installed on the adjusting shaft (20), the working surface of the free adjusting wheel (50) is formed with free adjusting section (51) and gear cooperation section (52), in the circumferential direction of the adjusting shaft (20), the free adjusting section (51) corresponds with adjusting cooperation section (32), and the gear cooperation section (52) corresponds with pre-set gear segment (31).

5. A gear adjustment mechanism for a clamp according to claim 4, wherein The free adjusting wheel (50) is coaxially installed on the adjusting shaft (20), the free adjusting section (51) and gear cooperation section (52) are formed on the outer circumferential surface of free adjusting wheel (50), and the radial dimension of the free adjusting section (51) is less than the radial dimension of gear cooperation section (52).

6. A gear adjustment mechanism for a clamp according to claim 4, wherein The free adjusting wheel (50) is coaxially installed on the adjusting shaft (20), the free adjusting section (51) and gear cooperation section (52) are formed on the end surface of free adjusting wheel (50), and the axial spacing of the free adjusting section (51) and pre-set gear wheel (30) is less than the axial spacing of gear cooperation section (52) and pre-set gear wheel (30).

7. A gear adjustment mechanism for a clamp according to claim 1, wherein The adjusting hand wheel (40) comprises a baffle (41), a hand wheel (42), a limiting ball (43), a damping spring (44) and a plug (45), the baffle (41) is coaxially sleeved on the adjusting rotating shaft (20) and is fixedly connected with the rack (10), and a plurality of gear grooves (46) are circumferentially distributed on the baffle (41); the hand wheel (42) is fixedly connected with one end of the adjusting rotating shaft (20), an axial through hole (47) is formed on the hand wheel (42), the plug (45) is fixedly installed at one end of the axial through hole (47), the limiting ball (43) is accommodated at the other end of the axial through hole (47), the damping spring (44) is accommodated in the axial through hole (47), one end of the damping spring (44) abuts against the plug (45), and the other end of the damping spring (44) abuts against the limiting ball (43).

8. A gear adjustment mechanism for a clamp according to claim 1, wherein The number of the preset gear wheels (30) is multiple, and the multiple preset gear wheels (30) are arranged at an axial interval.

9. A sewing machine characterized by comprising: The sewing machine comprises the gear adjusting mechanism of the clamp according to any one of claims 1-8.

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