Sewing thread clamping and shearing device and sewing machine

Abstract

The invention discloses a sewing thread clamping and shearing device and a sewing machine, and relates to the technical field of sewing machines, the sewing thread clamping and shearing device comprises a fixed cutter, a movable cutter, a clamping piece and a positioning piece fixedly connected to the fixed cutter, the movable cutter and the clamping piece are arranged on the periphery of the positioning piece in a sleeving mode and can rotate around the axis of the positioning piece relative to the fixed cutter, and the fixed cutter is provided with a cutting part; the cutting part is used for cutting a suture, the movable knife is provided with a first clamping part, the clamping piece is provided with a second clamping part, the second clamping part and the first clamping part are oppositely arranged in the rotating direction of the movable knife, and the second clamping part is located between the first clamping part and the cutting part; the first clamping part can move towards the second clamping part so as to clamp a suture located between the first clamping part and the second clamping part and drive the suture to move towards the cutting part for cutting. The clamping action is achieved in a thread clamping mode, the sewing thread is sheared after being clamped, and the problem that clamping of a thread end by a clamping piece and a movable cutter is prone to failure in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and in particular to a thread clamping and cutting device and a sewing machine. Background Technology

[0002] As a key piece of equipment in sewing, the performance of the thread-cutting structure of a flat-head buttonhole machine directly affects the degree of automation, work efficiency, and final stitch quality of the sewing process. Currently, the mainstream thread-cutting structure in the industry generally adopts a cutting scheme in which a fixed blade and a movable blade work together, relying on the overlapping and contact between the movable blade and the upper clamping plate to achieve the thread clamping function after cutting. This structure uses a drive mechanism to move the movable blade toward the fixed blade. While the double blades engage to cut the thread, the lower surface of the clamping plate and the upper surface of the movable blade cooperate to press down the thread, thereby restraining the thread end and providing a stable thread segment for subsequent sewing processes.

[0003] However, its thread-clamping function relies entirely on a single clamping plate. Under long-term, high-frequency operation, the clamping plate is prone to wear and deformation. Furthermore, lint on the thread surface continuously accumulates in the mating gap, causing a sustained decrease in clamping force. This can easily lead to "flying thread" at the moment of starting the stitch due to insecure thread end fixation, severely affecting the consistency and reliability of the stitch beginning. In addition, during the thread-cutting action, the closing timing and coordination of the clamping plate and the movable blade have inherent deficiencies: they often begin cutting the thread before the movable blade has fully clamped in place, causing the thread to be cut before it is adequately compressed and fixed, resulting in clamping failure.

[0004] Therefore, how to improve the problem of easy failure of clamping plates and movable blades to clamp the wire ends in related technologies is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a thread clamping and cutting device and a sewing machine that can improve the problem of easy failure of the clamping plate and movable blade to hold the thread end in the related art.

[0006] To achieve the above objectives, the present invention provides a suture clamping and cutting device, including a fixed blade, a movable blade, a clamping plate, and a positioning member fixedly connected to the fixed blade. The movable blade and the clamping plate are sleeved on the outer periphery of the positioning member and can rotate relative to the fixed blade about the axis of the positioning member. The fixed blade is provided with a cutting part for cutting sutures. The movable blade is provided with a first clamping part, and the clamping plate is provided with a second clamping part. The second clamping part and the first clamping part are arranged opposite to each other in the rotation direction of the movable blade, and the second clamping part is located between the first clamping part and the cutting part. The first clamping part can move toward the second clamping part to clamp the suture located between the first clamping part and the second clamping part and drive the suture toward the cutting part for cutting.

[0007] In one possible implementation, the first clamping part has a groove structure on the side facing the second clamping part, and the second clamping part has a protrusion structure adapted to the groove structure on the side facing the first clamping part.

[0008] In one possible implementation, a limiting member is also included. The limiting member is connected to the fixing blade. The clamping plate is provided with a first limiting hole. At least a portion of the limiting member is located in the first limiting hole. The first limiting hole includes a first limiting inner wall and a second limiting inner wall that are disposed opposite to each other in the rotation direction of the clamping plate. The outer periphery of the limiting member can abut against the first limiting inner wall or the second limiting inner wall to restrict the rotation of the clamping plate.

[0009] In one possible implementation, the movable blade is provided with a second limiting hole for a limiting member to pass through. The second limiting hole includes a third limiting inner wall and a fourth limiting inner wall that are disposed opposite to each other in the rotation direction of the movable blade. The outer periphery of the limiting member can abut against the third limiting inner wall or the fourth limiting inner wall to restrict the rotation of the movable blade.

[0010] In one possible implementation, a drive member is also included, which is connected to the fixed blade and the clamping plate. The drive member is used to drive the clamping plate to rotate relative to the fixed blade about the axis of the positioning member, so as to move the second clamping part away from the cutting part.

[0011] In one possible implementation, the fixed blade is provided with a first fixed post, the clamping plate is provided with a second fixed post, and the driving member is provided with a first connecting part, a second connecting part, and an elastic part located between the first connecting part and the second connecting part. The elastic part is used to drive the first connecting part and the second connecting part to abut against the opposite side of the first fixed post and the second fixed post, so that the first fixed post and the second fixed post move closer to each other.

[0012] In one possible implementation, the fixed blade is provided with a first connecting hole, and the positioning member includes a stop and a connecting post connected to the stop. The end of the connecting post facing away from the stop is connected to the first connecting hole so that the positioning post is fixedly connected to the fixed blade.

[0013] In one possible implementation, the movable blade is provided with a second connecting hole, which is coaxially arranged with the first connecting hole. The second connecting hole is used for the connecting post to pass through, and the stop head can prevent the movable blade from disengaging from the fixed blade.

[0014] In one possible implementation, the clamping plate is provided with a third connecting hole, which is coaxially arranged with the second connecting hole. The third connecting hole is used for the connecting post to pass through, and the stop head can prevent the clamping plate from disengaging from the fixing knife.

[0015] Based on the above, this application also provides a sewing machine, including a thread clamping and cutting device as described in any of the above embodiments.

[0016] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects: a positioning member is connected to the fixed blade, and the movable blade and clamping plate are sleeved on the outer periphery of the positioning member and can rotate relative to the fixed blade around the axis of the positioning member. The movable blade is provided with a first clamping part, and the clamping plate is provided with a second clamping part. The first clamping part and the second clamping part are arranged opposite to each other in the rotation direction of the movable blade, and the second clamping part is located between the first clamping part and the cutting part of the fixed blade. The movable blade is driven to rotate around the axis of the positioning member, and the first clamping part moves toward the second clamping part to clamp the thread located between the first clamping part and the second clamping part. The clamping action is achieved by clamping the thread. Compared with the overlapping clamping method, the thread can be clamped more stably, and the clamping method does not generate shearing force, ensuring the stability of the clamped thread. After the thread is clamped, the first clamping part and the second clamping part drive the thread to move toward the cutting part for cutting. After clamping in place, the thread is cut, ensuring that the clamping action is completed before the cutting action. This setting can improve the problem of easy failure of the clamping plate and the movable blade to clamp the thread end in the related art. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the suture clamping and cutting device provided in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram showing the initial positions of the first clamping part and the second clamping part provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the driving component provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the suture clamping and cutting device before clamping the suture provided in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the suture clamping and cutting device provided in an embodiment of the present invention when clamping the suture;

[0023] Figure 6 This is a schematic diagram of the suture clamp and cutter device provided in an embodiment of the present invention when it completes suture cutting.

[0024] in:

[0025] 100-Fixed blade, 110-Cutting section, 120-First fixing post, 130-Mounting hole;

[0026] 200-Modible blade, 210-First clamping part, 211-Groove structure, 220-Second limiting hole, 230-Drive plate;

[0027] 300-Clamping piece, 310-Second clamping part, 311-Protruding structure, 320-First limiting hole, 330-Second fixing post;

[0028] 400 - Positioning component;

[0029] 500 - Limiting component;

[0030] 600-Driver;

[0031] 700-Wire clamp opening;

[0032] 800-stitch. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this invention.

[0036] The purpose of this invention is to provide a thread clamping and cutting device and a sewing machine that can improve the problem of easy failure of the clamping plate and movable blade to hold the thread end in the related art.

[0037] Please see Figures 1 to 6To achieve the above objectives, the present invention provides a thread clamping and cutting device, including a fixed blade 100, a movable blade 200, a clamping plate 300, and a positioning member 400 fixedly connected to the fixed blade 100. The fixed blade 100 has an overall L-shaped bent structure and includes a vertical plate and a horizontal extension plate connected to the vertical plate. The vertical plate has a mounting hole 130 for fixing the fixed blade 100 in the corresponding mounting position on the sewing machine, thereby fixing the entire clamping and cutting device in the corresponding mounting position on the sewing machine. The positioning member 400 is fixedly connected to the horizontal extension plate. The horizontal extension plate of the fixed blade 100 has a cutting part 110 for cutting the thread 800. The movable blade 200 and the clamping plate 300 are sleeved on the outer periphery of the positioning member 400 and can rotate relative to the fixed blade 100 around the axis of the positioning member 400. Specifically, the movable blade 200 is located above the horizontal extension plate, and the main body of the clamping plate 300 is located above the movable blade 200.

[0038] The horizontal extension plate of the fixed blade 100 has a first connecting hole. The positioning member 400 includes a stop and a connecting post connected to the stop. The end of the connecting post facing away from the stop is connected to the first connecting hole, so that the positioning post is fixedly connected to the fixed blade 100. The movable blade 200 has a second connecting hole, which is coaxial with the first connecting hole and is used for the connecting post to pass through. The main body of the clamping plate 300 has a third connecting hole, which is coaxial with the second connecting hole and is used for the connecting post to pass through. Specifically, the second and third connecting holes are aligned with the first connecting hole. Then, the connecting post of the positioning member 400 passes through the third and second connecting holes from top to bottom and connects to the first connecting hole. The stop is located above the main body of the clamping plate 300 and is used to prevent the movable blade 200 and the clamping plate 300 from disengaging from the fixed blade 100. The first connecting hole may be, but is not limited to, a threaded hole, and the positioning member 400 may be, but is not limited to, a screw.

[0039] The movable blade 200 is provided with a first clamping part 210, and the clamping plate 300 is provided with a second clamping part 310. The second clamping part 310 is connected to the main body of the clamping plate 300, and the end of the second clamping part 310 facing the first clamping part 210 is set at the same height as the first clamping part 210. The second clamping part 310 and the first clamping part 210 are arranged opposite to each other in the rotation direction of the movable blade 200. The gap between the second clamping part 310 and the first clamping part 210 forms a thread clamping opening 700, which is used for the sewing thread 800 to pass through. The second clamping part 310 is located between the first clamping part 210 and the cutting part 110. The first clamping part 210 can move toward the second clamping part 310 to fit against the second clamping part 310 to clamp the thread 800 located between the first clamping part 210 and the second clamping part 310 to complete the clamping action. Afterwards, the second clamping part 310 and the first clamping part 210 move synchronously with the second clamping part 310 and drive the thread 800 toward the cutting part 110 to cut. Specifically, when the thread 800 at the bottom of the second clamping part 310 and the first clamping part 210 contacts the upper edge blade of the cutting part 110, it will generate an instantaneous shearing force on the thread 800, causing the thread 800 to be cut.

[0040] A positioning member 400 is connected to the fixed blade 100. The movable blade 200 and the clamping plate 300 are sleeved on the outer periphery of the positioning member 400 and can rotate relative to the fixed blade 100 around the axis of the positioning member 400. The movable blade 200 has a first clamping part 210, and the clamping plate 300 has a second clamping part 310. The first clamping part 210 and the second clamping part 310 are arranged opposite to each other in the rotation direction of the movable blade 200, and the second clamping part 310 is located between the first clamping part 210 and the cutting part 110 of the fixed blade 100. When the movable blade 200 is driven to rotate around the axis of the positioning member 400, the first clamping part 210 moves toward the second clamping part 310 to clamp the thread 800 located between the first clamping part 210 and the second clamping part 310. The clamping action is achieved by clamping the thread. Compared with the overlapping clamping method, the thread can be clamped more stably, and the clamping method does not generate shearing force, ensuring the stability of the clamped thread. After the thread clamping is completed, the first clamping part 210 and the second clamping part 310 drive the thread 800 to move toward the cutting part 110 for cutting. After clamping in place, the thread 800 is then cut. This ensures that the thread clamping action is completed before the cutting action. This setting can improve the problem of easy failure of the clamping plate 300 and the movable blade 200 to clamp the thread end in related technologies.

[0041] The movable blade 200 is equipped with a drive plate 230. The movable blade 200 is an integral structure. When an external force is applied to the drive plate 230, the movable blade 200 can be driven to rotate relative to the fixed blade 100 around the axis of the positioning member 400. After completing the above-mentioned clamping and cutting actions, an opposite external force is applied, which can drive the movable blade 200 to rotate in the opposite direction relative to the fixed blade 100 around the axis of the positioning member 400, so that the first clamping part 210 of the movable blade 200 disengages from the cutting part 110 and the second clamping part 310 for the next cutting action. That is, the opening and closing of the clamping port 700 is achieved by moving the drive plate 230.

[0042] In one possible implementation, the first clamping part 210 has a groove structure 211 on the side facing the second clamping part 310, and the second clamping part 310 has a protrusion structure 311 adapted to the groove structure 211 on the side facing the first clamping part 210. The groove structure 211 can be, but is not limited to, a "V" shaped groove, a serrated groove, or a U-shaped groove, and the protrusion structure 311 can be, but is not limited to, a "V" shaped protrusion, a serrated protrusion, or a U-shaped protrusion. Taking the engagement of the "V" shaped groove and the "V" shaped protrusion as an example, the engagement of the "V" shaped groove and the "V" shaped protrusion can achieve the clamping of the suture 800. Specifically, the "V" shaped groove and the "V" shaped protrusion increase the contact area and friction between the suture 800 and the first clamping part 210 and the second clamping part 310 through the concave-convex cooperation, which can avoid the technical problems of easy slippage and suture 800 coming out in traditional planar suture clamping, ensure the accurate positioning of the suture 800 during the suture cutting process, and improve the cutting stability. Alternatively, silicone or rubber materials can be added to the surfaces of the groove structure 211 and the raised structure 311 to increase the coefficient of friction and prevent the stitch 800 from flying out.

[0043] In one possible implementation, a limiting member 500 is further included. The limiting member 500 is connected to the fixed blade 100. The clamping plate 300 is provided with a first limiting hole 320. At least a portion of the limiting member 500 is located within the first limiting hole 320. The first limiting hole 320 includes a first limiting inner wall and a second limiting inner wall that are disposed opposite to each other in the rotational direction of the clamping plate 300. The outer periphery of the limiting member 500 can abut against the first limiting inner wall or the second limiting inner wall to restrict the rotation of the clamping plate 300. Taking the counterclockwise rotation of the movable blade 200 to achieve the wire clamping and cutting actions as an example, the first limiting inner wall can be set in the clockwise direction of the limiting member 500, and the second limiting inner wall can be set in the counterclockwise direction of the limiting member 500. When the clamping plate 300 rotates counterclockwise with the movable blade 200, the limit position that the clamping plate 300 can rotate to is the position where the limiting member 500 abuts against the second limiting inner wall. Correspondingly, when the movable blade 200 is in the position before clamping the line (a position that does not interfere with the clockwise movement of the clamping plate 300), the limit position that the clamping plate 300 can move clockwise is the position where the limiting member 500 abuts against the first limiting inner wall. At this time, the distance between the second clamping part 310 and the cutting part 110 is the farthest. In this way, the movement of the clamping plate 300 can be physically limited to prevent the clamping plate 300 from rotating excessively.

[0044] In one possible implementation, the movable blade 200 is provided with a second limiting hole 220 for the limiting member 500 to pass through. The second limiting hole 220 includes a third limiting inner wall and a fourth limiting inner wall disposed opposite to each other in the rotation direction of the movable blade 200. The outer periphery of the limiting member 500 can abut against the third limiting inner wall or the fourth limiting inner wall to restrict the rotation of the movable blade 200. Taking the counterclockwise rotation of the movable blade 200 to achieve the wire clamping and cutting action as an example, the third limiting inner wall can be set in the clockwise direction of the limiting member 500, and the fourth limiting inner wall can be set in the counterclockwise direction of the limiting member 500. When the movable blade 200 rotates counterclockwise, its maximum rotational position is the position where the limiting member 500 abuts against the fourth limiting inner wall. Conversely, when the movable blade 200 rotates clockwise, its maximum rotational position is the position where the limiting member 500 abuts against the third limiting inner wall. At this point, the distance between the first clamping part 210 and the cutting part 110 is at its maximum. This physically limits the movement of the movable blade 200, preventing excessive rotation of the clamping plate 300.

[0045] It should be noted that the first limiting hole 320 and the second limiting hole 220 can be, but are not limited to, waist-shaped, U-shaped, arc-shaped, etc., as long as they can achieve the above purpose. Alternatively, the clamping plate 300 can limit the counterclockwise rotation of the movable blade 200 at its extreme position. Specifically, when the second clamping part 310 of the clamping plate 300 can no longer rotate in the counterclockwise direction, the second clamping part 310 will hinder the first clamping part 210 from rotating in the counterclockwise direction, thereby limiting the extreme position of the counterclockwise rotation of the movable blade 200.

[0046] In one possible implementation, a driving member 600 is further included. The driving member 600 is connected to the fixed blade 100 and the clamping plate 300. The driving member 600 is used to drive the clamping plate 300 to rotate relative to the fixed blade 100 about the axis of the positioning member 400, so that the second clamping part 310 moves away from the cutting part 110. That is, the driving member 600 is used to drive the clamping plate 300 to rotate clockwise relative to the fixed blade 100. Specifically, the fixed blade 100 is provided with a first fixing post 120, and the clamping plate 300 is provided with a second fixing post 330. The axes of the first fixing post 120 and the second fixing post 330 are parallel and both are parallel to the axis of the positioning member 400. The driving member 600 can be, but is not limited to, a torsion spring, a spring, a magnet, etc. The torsion spring and the spring drive the clamping plate 300 through elastic force, and the magnet drives the clamping plate 300 through the attraction or repulsion properties of magnets. Taking the driving component 600 as an example, the driving component 600 is provided with a first connecting part, a second connecting part, and an elastic part located between the first connecting part and the second connecting part.

[0047] In one embodiment, when the clamping plate 300 rotates clockwise, as the distance between the first fixed post 120 and the second positioning post gradually decreases, the elastic part is used to drive the first connecting part and the second connecting part to abut against the opposite sides of the first fixed post 120 and the second fixed post 330, so that the first fixed post 120 and the second fixed post 330 move closer to each other. In another embodiment, when the clamping plate 300 rotates clockwise, as the distance between the first fixed post 120 and the second positioning post gradually increases, the elastic part is used to drive the first connecting part and the second connecting part to abut against the opposite sides of the first fixed post 120 and the second fixed post 330, so that the first fixed post 120 and the second fixed post 330 move further apart from each other. The driving member 600 always provides a counterclockwise rotational force to the clamping plate 300 to ensure that the first clamping part 210 contacts the second clamping part 310 first to complete the wire clamping action during rotation, and then moves towards the cutting part 110 to cut the wire.

[0048] With the wire clamping opening 700 open, the drive plate 230 is subjected to a counterclockwise external force. The movable blade 200 rotates counterclockwise around the positioning member 400, causing the wire clamping opening 700 to gradually close. The wire passes vertically through the wire clamping opening 700. When the wire clamping opening 700 closes, the "V"-shaped groove and the "V"-shaped protrusion engage, clamping the wire. After clamping the wire, the drive plate 230 continues to be subjected to a counterclockwise external force. The movable blade 200 drives the clamping plate 300 to move closer to the cutting part 110. At this time, the elastic member is continuously stretched, providing a continuous clamping force for the wire. When the wire contacts the cutting part 110, the wire is subjected to a shearing force, completing the wire cutting. After cutting, the wire end is still clamped by the wire clamping opening 700. Continuing to apply a counterclockwise external force to the drive plate 230 can maintain the clamping state. If it is necessary to loosen the wire, simply remove the external force from the drive plate 230 and apply a clockwise external force to the drive plate 230 to open the wire clamping opening 700 and release the wire end.

[0049] The thread clamping opening 700 employs a "V"-shaped groove and "V"-shaped protrusion interlocking structure, combined with the continuous clamping force provided by the elastic element. This enhances the friction of the thread 800 to prevent it from slipping off, and maintains the stability of the thread 800's position during thread cutting, improving cutting accuracy. Different elastic coefficients of the elastic element can be selected to adjust the clamping force. During thread loosening, the elastic element has a rebound action, gradually reducing the clamping force until the thread clamping opening 700 finally opens to complete the loosening, avoiding thread skipping caused by sudden changes in clamping force and improving the thread wrapping rate. The rebound force of the drive component 600 automatically resets the clamping plate 300 to its initial state, eliminating the need for an additional reset mechanism, simplifying the device structure, and reducing assembly and maintenance costs. With the coordinated action of the drive component 600 and the limiting component 500, the wire clamping opening 700 is in the open state, and the "V"-shaped protrusion slightly protrudes from the cutting part 110. The opening and closing action of the wire clamping opening 700 and the cutting action of the movable blade 200 driving the wire body to move are linked through the same drive source to ensure that the wire clamping action is completed before the cutting action.

[0050] Based on the foregoing, this application also provides a sewing machine, including a thread clamping and cutting device as described in any of the above embodiments. The sewing machine also possesses all the beneficial effects of the aforementioned thread clamping and cutting device; the remaining structure of the sewing machine can refer to the prior art, as long as it achieves the above objectives.

[0051] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A thread clamping and cutting device, characterized in that, The device includes a fixed blade (100), a movable blade (200), a clamping plate (300), and a positioning member (400) fixedly connected to the fixed blade (100). The movable blade (200) and the clamping plate (300) are sleeved on the outer periphery of the positioning member (400) and can rotate relative to the fixed blade (100) about the axis of the positioning member (400). The fixed blade (100) is provided with a cutting part (110) for cutting the seam thread (800). The movable blade (200) is provided with a first clamping part (210). The clamping plate (300) is fixedly connected to the fixed blade (100). The device is provided with a second clamping part (310), which is disposed opposite to the first clamping part (210) in the rotation direction of the movable blade (200). The second clamping part (310) is located between the first clamping part (210) and the cutting part (110). The first clamping part (210) can move toward the second clamping part (310) to clamp the suture (800) located between the first clamping part (210) and the second clamping part (310) and drive the suture (800) toward the cutting part (110) for cutting.

2. The suture clamping and cutting device according to claim 1, characterized in that, The first clamping part (210) has a groove structure (211) on the side facing the second clamping part (310), and the second clamping part (310) has a protrusion structure (311) adapted to the groove structure (211) on the side facing the first clamping part (210).

3. The suture clamping and cutting device according to claim 1, characterized in that, It also includes a limiting member (500) connected to the fixing blade (100). The clamping plate (300) is provided with a first limiting hole (320). At least a portion of the limiting member (500) is located within the first limiting hole (320). The first limiting hole (320) includes a first limiting inner wall and a second limiting inner wall disposed opposite to each other in the rotation direction of the clamping plate (300). The outer periphery of the limiting member (500) can abut against the first limiting inner wall or the second limiting inner wall to restrict the rotation of the clamping plate (300).

4. The suture clamping and cutting device according to claim 3, characterized in that, The movable blade (200) is provided with a second limiting hole (220), which is used for the limiting member (500) to pass through. The second limiting hole (220) includes a third limiting inner wall and a fourth limiting inner wall that are arranged opposite to each other in the rotation direction of the movable blade (200). The outer periphery of the limiting member (500) can abut against the third limiting inner wall or the fourth limiting inner wall to restrict the rotation of the movable blade (200).

5. The suture clamping and cutting device according to claim 1, characterized in that, It also includes a drive member (600) connected to the fixed blade (100) and the clamping plate (300), the drive member (600) being used to drive the clamping plate (300) to rotate relative to the fixed blade (100) about the axis of the positioning member (400) so that the second clamping part (310) is away from the cutting part (110).

6. The suture clamping and cutting device according to claim 5, characterized in that, The fixed blade (100) is provided with a first fixed post (120), the clamping plate (300) is provided with a second fixed post (330), and the driving member (600) is provided with a first connecting part, a second connecting part and an elastic part located between the first connecting part and the second connecting part. The elastic part is used to drive the first connecting part and the second connecting part to abut against the opposite side of the first fixed post (120) and the second fixed post (330) respectively, so that the first fixed post (120) and the second fixed post (330) move closer to each other.

7. The suture clamping and cutting device according to any one of claims 1 to 6, characterized in that, The fixed blade (100) is provided with a first connecting hole, and the positioning member (400) includes a stop and a connecting post connected to the stop. The end of the connecting post facing away from the stop is connected to the first connecting hole so that the positioning post is fixedly connected to the fixed blade (100).

8. The suture clamping and cutting device according to claim 7, characterized in that, The movable blade (200) is provided with a second connecting hole, which is coaxially arranged with the first connecting hole. The second connecting hole is used for the connecting post to pass through, and the stop head can restrict the movable blade (200) from disengaging from the fixed blade (100).

9. The suture clamping and cutting device according to claim 7, characterized in that, The clamping plate (300) is provided with a third connecting hole, which is coaxially arranged with the second connecting hole. The third connecting hole is used for the connecting post to pass through, and the stop head can restrict the clamping plate (300) from disengaging from the fixing knife (100).

10. A sewing machine, characterized in that, Includes the suture clamping and cutting device as described in any one of claims 1-9.

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