WO2024087592A1

WO2024087592A1 - Thread trimming device and automatic stitching device

Info

Publication number: WO2024087592A1
Application number: PCT/CN2023/094740
Authority: WO
Inventors: 苏建丰; 黄钿
Original assignee: 浙江博睿智能科技有限公司; 苏建丰
Priority date: 2022-10-24
Filing date: 2023-05-17
Publication date: 2024-05-02
Also published as: EP4361334A1; CN218666636U

Abstract

The present utility model provides a thread trimming device, comprising: a fixing base (73); a fixed trimming piece (61) fixed on the fixing base (73); a movable trimming piece (62) fixed on the fixing base (73) by means of a bolt (74); a bent pull plate (65), the upper end of the bent pull plate (65) being bonded to the tail end of the movable trimming piece (62); and a large-angle pull plate (69), the upper end of the large-angle pull plate (69) being bonded to the lower end of the bent pull plate (65), and when the lower end of the large-angle pull plate (69) is pushed and pulled, the movable trimming piece (62) being opened and closed relative to the fixed trimming piece (61). The present utility model also provides an automatic stitching device, comprising: the thread trimming device (6); and a knitting device (1), the position of the thread trimming device (6) being close to a knitting point of the knitting device (1). According to the present utility model, after knitting is completed, a knitting thread loop can be automatically trimmed off, without needing to perform secondary processing on a fabric, thereby achieving automatic production.

Description

Thread cutting device and automatic sewing device

Technical Field

The utility model relates to a seam head, and more particularly to a thread cutting device and an automatic sewing device.

Background technique

At present, the sewing machine equipment technology can only complete basic weaving tasks. For example, cylindrical fabrics can only be woven as a whole, and one end of the fabric cannot be automatically sewn. The woven fabric needs to be placed on another sewing device for secondary processing and sewing to complete all the processes of the fabric. During this period, multiple workers need to cooperate with each other to complete all the processes. At the current stage of the production process, it can neither improve production efficiency nor reduce production costs.

Utility Model Content

In response to the problems in the background technology, the utility model proposes a wire cutting device, comprising: a fixed seat; a fixed shearing piece, which is fixed on the fixed seat; a movable shearing piece, which is fixed on the fixed seat by a pin; a bending and pulling plate, the upper end of which is coupled to the end of the movable shearing piece; a large-angle pulling plate, the upper end of which is coupled to the lower end of the bending and pulling plate; when the lower end of the large-angle pulling plate is pushed and pulled, the movable shearing piece is opened and closed relative to the fixed shearing piece.

Preferably, the wire cutting device also includes: a bent hook piece, which is installed together with the movable shear piece and moves together; a bent push piece, which is fixed to a fixed seat by a pin; a paddle, the first end of which is combined with the end of the bent push piece to push and pull the bent push piece, and the second end of the paddle can move between the eccentric tightening ring on the bending and pulling plate and the upper end of the large-angle pulling plate.

Preferably, the heads of the hook piece and the push piece are hook-shaped, and the hooks are opposite to each other.

Preferably, when the lower end of the large-angle pull plate is pushed, the movable shearing piece approaches the fixed shearing piece, and the paddle makes the bent push piece move closer to the middle. Before cutting the wire, the bent push piece first contacts and pushes out a certain length of the wire to be cut, and then the hook piece contacts and tightens the wire to be cut, and the movable shearing piece and the fixed shearing piece cut the wire; when the lower end of the large-angle pull plate is pulled, the hook piece The movable shearing piece moves away from the fixed shearing piece, and the bending push piece and the bending hook piece move in opposite directions.

Preferably, the wire trimming device further comprises: a cylinder connected to the lower end of the large-angle pulling plate; and a tension spring connecting the cylinder and the large-angle pulling plate.

The thread trimming device of the utility model has an ingenious and compact structure and can be effectively matched with a sewing and weaving machine to perform thread trimming.

The utility model also proposes an automatic sewing device, comprising: a thread cutting device as described above; a sewing device, which has a first sewing needle, a second sewing needle and a steel needle that cooperate with each other to tie knots; the thread cutting device is located close to the sewing point of the sewing device, and cuts the sewing coil after the sewing of the sewing device is completed.

Preferably, the sewing device also includes: a first connecting rod, whose first end is connected to the second end of the long crank, the first end of the long crank is equipped with a first needle holder, and the first sewing needle is installed on the first needle holder; a second connecting rod, whose first end is connected to the second end of the short crank, the first end of the short crank is equipped with a second needle holder, and the second sewing needle is installed on the second needle holder.

Preferably, the automatic suturing device also includes a motor device, which includes: a motor shaft; a large gear connected to one end of the motor shaft, the large gear having an eccentric mounting hole, the eccentric mounting hole being used to accommodate the second end of the first connecting rod; a small needle eccentric wheel connected to the other end of the motor shaft, the small needle eccentric wheel having an eccentric shaft end, and the eccentric shaft end is combined with the second end of the second connecting rod.

Preferably, the automatic suturing device further comprises: a small gear hand wheel meshing with the large gear.

Preferably, the distance from the cutting plane or cutting point of the cutting device to the tip of the steel needle is between 10.1-20 mm, and the distance from the cutting plane or cutting point to the point where the first seam knitting needle and the second seam knitting needle intersect is between 15.1-25 mm.

After the sewing machine equipment completes weaving, the automatic sewing device of the utility model transfers the fabric to the sewing device through the transfer device, and automatically sews one end of the fabric. After the sewing is completed, the thread cutting device automatically cuts off the sewing loops on the sewn fabric.

The beneficial effects of the utility model include: the opening of the fabric, such as the toe of the socks, can be automatically sewn during the weaving process, and a thread cutting device is provided, which can automatically cut the sewing coils after the sewing is completed, and the fabric does not need to be processed again, which greatly improves the production efficiency, reduces the cost, and realizes automated production.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to make the present invention more easily understood, the present invention will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. These drawings only depict typical embodiments of the present invention and should not be considered as limiting the scope of protection of the present invention.

FIG. 1 is a perspective view of the automatic suturing device of the present invention.

FIG. 2 is a front view of the automatic suturing device of the present invention.

FIG. 3 is a three-dimensional view of the automatic suturing device of the present invention from another angle.

FIG. 4 is a three-dimensional view of the motor device of the automatic suturing device of the present invention from one angle.

FIG. 5 is a three-dimensional view of the motor device of the automatic suturing device of the present invention from another angle.

FIG. 6 is a left side view of the automatic suturing device of the present invention shown in FIG. 2 .

FIG. 7 is a right side view of the automatic suturing device of the present invention shown in FIG. 2 .

FIG. 8 is a rear view of the automatic suturing device of the present invention shown in FIG. 2 .

FIG. 9 is a schematic diagram of the structure of the steel needle of the automatic suturing device of the present invention.

FIG. 10 is a top view of the automatic suturing device of the present invention shown in FIG. 2 .

11-14 show the movement process of the sewing needle and the steel needle of the present invention.

FIG. 15 is a schematic structural diagram of a thread trimming device of the automatic suturing device of the present invention in an open state.

FIG. 16 is a schematic structural diagram of a thread trimming device of the automatic suturing device of the present invention in a closed state.

Figure 1: sewing device 1, steel needle 2, steel needle tip head 211, steel needle tip 212, steel needle body 213, steel needle mounting seat 22, first sewing needle 3, second sewing needle 4, motor device 5, large gear 51, eccentric mounting hole 511, first connecting rod 52, long crank 53, small gear hand wheel 54, small needle eccentric wheel 55, eccentric shaft end 551, second connecting rod 56, short crank 57, thread trimming device 6, fixed shearing piece 61, movable shear Plate 62, bent hook plate 63, bent push plate 64, bent pull plate 65, eccentric tightening ring 66, paddle 67, hanging seat 68, large angle pull plate 69, tension spring 70, cylinder 71, support plate 72, fixed seat 73, latch 74, sewing coil 8, first needle holder 9, second needle holder 10, motor rotation direction 11, first connecting rod movement direction 12, first sewing needle movement direction 13, second connecting rod movement direction 14, second sewing needle movement direction 15, sewing direction 16.

Detailed ways

The following describes the implementation mode of the present invention with reference to the accompanying drawings, so that those skilled in the art can better understand the present invention and implement it. However, the enumerated embodiments are not intended to limit the present invention. In the absence of conflict, the following embodiments and the technical features in the embodiments can be combined with each other, wherein the same components are represented by the same figure marks.

The device of the present application is described below using a fabric opening as an example, but the present application is not limited to sewing a fabric opening.

As shown in FIGS. 1-2 , an automatic sewing device capable of automatically cutting threads of the present invention comprises: a sewing device 1 and a thread cutting device 6 .

The sewing device 1 includes: a first sewing needle 3, a second sewing needle 4 and a steel needle 2. The first sewing needle 3 (large needle) and the second sewing needle 4 (small needle) are mutually knotted and cooperate with the steel needle 2 to form a sewing coil 8 (see Figure 10), thereby sewing the opening of the fabric. The first sewing needle 3 is installed on the first needle holder 9, and the second sewing needle 4 is installed on the second needle holder 10. The first needle holder 9 and the second needle holder 10 are driven by the motor device 5 to drive the first sewing needle 3 and the second sewing needle 4 to perform a knotting movement: as shown in Figure 3, the first sewing needle 3 moves along the direction 13 (the movement direction of the first sewing needle), and the second sewing needle 4 moves along the direction 15 (the movement direction of the second sewing needle), and the movement planes where the movement directions of the first sewing needle 3 and the second sewing needle 4 are located are perpendicular to each other.

Fig. 4 shows a three-dimensional view of the motor device 5 from an angle. A large gear 51 is fixedly mounted on the motor device 5, and a convex block is mounted on the large gear 51, and an eccentric mounting hole 511 is provided on the convex block.

Fig. 5 shows a perspective view of the motor device 5 at one angle. A small needle eccentric wheel 55 is fixedly mounted on the motor device 5, and an eccentric shaft end 551 is fixed on the small needle eccentric wheel 55. The large gear 51 and the small needle eccentric wheel 55 can be mounted on both sides of the motor device 5.

The large gear 51 and the small needle eccentric wheel 55 can be arranged on a motor shaft. When the motor shaft rotates, the large gear 51 and the small needle eccentric wheel 55 can be driven to rotate simultaneously, thereby simultaneously actuating the first seam knitting needle 3 and the second seam knitting needle 4. In this way, the seam knitting can be adjusted by manually rotating the small gear hand wheel 54 (see below).

As shown in FIG6 , the sewing device 1 includes a first connecting rod 52 and a long crank 53, which are installed on a box body. The first end of the long crank 53 is installed with a first needle holder 9, and the first sewing needle 3 is installed on the first needle holder 9. The second end of the long crank 53 is connected to the first end of the first connecting rod 52, and the second end of the first connecting rod 52 is installed on the eccentric mounting hole 511 on the large gear 51 of the motor device 5. When the motor device 5 is running, the large gear 51 is driven to rotate clockwise in the direction of the arrow 11, and the first connecting rod 52 swings up and down in the direction indicated by the direction 12 (the direction of movement of the first connecting rod, see FIG8 ). Thereby, the second end of the long crank 53 is driven to move back and forth in the direction 16: when the eccentric mounting hole 511 runs to the lowest position, the second end of the long crank 53 is pulled down; when the eccentric mounting hole 511 runs to the highest position, the second end of the long crank 53 returns to its original position. In this way, the first needle holder 9 located on the first end of the first connecting rod 52 moves back and forth in the direction 13, so that the first knitting needle 3 moves according to a fixed movement path.

As shown in Figure 7, the sewing device 1 also includes a short crank 57 and a second connecting rod 56, which are also installed on the box. The first end of the short crank 57 is equipped with a second needle holder 10, and the second needle holder 10 is equipped with a second sewing needle 4. The second end of the short crank 57 is connected to the first end of the second connecting rod 56, and the second end of the second connecting rod 56 is connected to the eccentric shaft end 551 of the small needle eccentric wheel 55, which is installed on the motor device 5 and driven by the motor device 5. When the motor device 5 rotates, the small needle eccentric wheel 55 is driven to rotate in direction 11 (motor rotation direction, counterclockwise), and the second connecting rod 56 swings back and forth up and down and left and right in the direction indicated by direction 14 (see Figure 8), driving the short crank 57 to move, and the needle holder 9 moves back and forth in direction 15, so that the second sewing needle 4 moves according to a fixed motion path.

Preferably, as shown in FIG6 and FIG8, a small gear hand wheel 54 is installed on the box body, which meshes with the large gear 51. In the initial debugging, the hand wheel 54 is manually rotated to drive the large gear 51 to rotate, so that the first stitching needle 3 and the second stitching needle 4 move, which is convenient for observing whether the stitching position is correct and the stitching effect. After debugging, the speed of the motor device 5 (controlled by the textile machine computer control system) is configured to achieve a uniform and stable movement effect.

As shown in Fig. 1-3, the sewing device 1 also includes a steel needle mounting seat 22 and a steel needle 2, and the steel needle 2 is mounted on the steel needle mounting seat 22. The structure of the steel needle 2 is shown in Fig. 9. The steel needle 2 includes a steel needle tip 212 and a steel needle body 213. The needle tip 212 is located at one end of the steel needle body 213. The needle tip 212 extends outward and gradually narrows on both sides. The front end of the steel needle tip 212 has a steel needle tip head 211. The steel needle 2 is outside the first stitching needle 3. The steel needle 2 is parallel to the plane where the first stitching needle 3 moves and is perpendicular to the plane where the second stitching needle 4 moves. The first stitching needle 3 and the second stitching needle 4 cooperate with the steel needle 2 to perform interlaced motion to perform stitching and weaving to form a chain stitch (sewing loop 8).

The movement process of the first seam knitting needle 3 and the second seam knitting needle 4 is described below with reference to Figures 10-14.

As shown in FIG. 10 , the fabric to be sewn is placed in the sewing position. The sewing position is below the first sewing needle 3, above the second sewing needle 4, and to the left of the steel needle 2. The fabric to be sewn is supported by a circular seam head tooth (not shown), which can be rotated or moved so that the sewing loop 8 is always placed in the sewing position. In terms of the general direction of the fabric's movement, the direction of movement of the fabric to be sewn is shown in the direction 16 (sewing direction) in the figure, that is, it is consistent with the main body direction of the steel needle 2.

As shown in two views at 90 degrees in FIG. 11 , before sewing begins, the first sewing needle 3 and the second sewing needle 4 are at the starting position.

As shown in two views at 90 degrees in Figure 12, at the beginning of sewing, the second sewing needle 4 moves upward (see the right side view in Figure 12) to pass through the sewing thread carried by the first sewing needle 3, so that the sewing thread is wrapped around the back of the second sewing needle 4 to form a loop, and the second sewing needle 4 passes through the coil of the fabric, and at the same time the first sewing needle 3 moves backward (see the left side view in Figure 12), tightening the thread wrapped around the second sewing needle, and making the sewing thread on the first sewing needle 3 wrapped around the steel needle 2.

As shown in two views at 90 degrees in FIG. 13 , when the first knitting needle 3 and the second knitting needle 4 both move to the other end, as shown in FIG. 14 , the first knitting needle 3 moves forward (see the left side view of FIG. 14 ), and the needle tip passes through the knitting thread carried by the second knitting needle, so that the knitting thread is wound around the needle back of the first knitting needle 3 to form a loop, and at the same time, the second knitting needle 4 moves downward (see the right side view of FIG. 14 ), tightening the thread wound around the first knitting needle, and making the knitting thread on the second knitting needle wind around the steel needle 2, so that the knitting threads on the first knitting needle 3 and the second knitting needle 4 can interlace with each other to form a knot.

The automatic sewing device of the present invention further comprises a thread trimming device 6. After sewing and weaving, the thread needs to be trimmed. As shown in FIGS. 1 , 2 , 15 and 16 , the thread trimming device 6 of the present invention comprises a fixed shearing piece 61 and a movable shearing piece 62 .

The fixed shearing piece 61 and the movable shearing piece 62 form a pair of scissors. When the movable shearing piece 62 moves to overlap with the movable shearing piece 61, the thread is cut.

The fixed shearing piece 61 is fixed on the fixing seat 73, and the fixed shearing piece 61 is immovable. The fixing seat 73 can be installed on the box body of the sewing device 1, so that the fixed shearing piece 61 is located below the first sewing needle 3, which is convenient for thread cutting.

The movable shearing piece 62 is installed on the upper end of the bending and pulling plate 65, the lower end of the bending and pulling plate 65 is connected to the upper end of the large angle pulling plate 69, and the lower end of the large angle pulling plate 69 is connected to the cylinder 71, and the cylinder 71 performs telescopic movement to move the movable shearing piece 62. When the cylinder 71 is inflated, the wire cutting device 6 is in a closed state (as shown in Figure 15), and when the cylinder 71 is deflated, the wire cutting device 6 is in an open state (as shown in Figure 16). The cylinder 71 is connected to the fixed seat 73 through the support plate 72.

Preferably, in order to ensure that the wire cutting device 6 can be quickly opened when the air is deflated, a tension spring 70 is installed on the cylinder 71, and the tension spring 70 is connected between the lower end of the large-angle pull plate 69 and the cylinder 71. Through the tension of the tension spring 70, the scissors composed of the fixed shearing blade 61 and the movable shearing blade 61 can be quickly opened after closing, so as to prepare for the next wire cutting.

Preferably, the thread cutting device 6 of the present invention further comprises a hook piece 63 and a push piece 64. The hook piece 63 and the movable shear piece 62 are fitted and installed on the upper end of the bending and pulling plate 65, and the two can move together. The ends of the hook piece 63 and the movable shear piece 62 are fixed on the hanging seat 68 through the latch 74, and the hanging seat 68 is fixed on the fixed seat 73. When the cylinder 71 moves, the hook piece 63 and the movable shear piece 62 are driven to move around the latch 74 together. The front end of the hook piece 63 is in the shape of a hook, which can hook the sewing coil 8 during the thread cutting process to prevent the sewing coil 8 from sliding out of the shearing position.

The push-bend piece 64 is installed outside the hook piece 63, and is installed in close contact with the hook piece 63, so that the push-bend piece 64 and the hook piece 63 can move relative to each other. The middle section of the push-bend piece 64 can also be fixed on the hanger 68 by a latch 74. The end of the push-bend piece 64 is a forked structure, and the forked structure accommodates the first end of the paddle 67.

The paddle 67 is L-shaped, and the first end of the paddle 67 is stuck in the bifurcated structure at the end of the bending push plate 64. The second end of the paddle 67 is stuck between the eccentric ring 66 of the bending and pulling plate 65 and the upper end of the large-angle pulling plate 69 (that is, the junction of the large-angle pulling plate 69 and the bending and pulling plate 65), and the movement stroke of the second end of the paddle 67 is also between the eccentric ring 66 and the upper end of the large-angle pulling plate 69.

The push-bend piece 64 moves in opposite directions to the hook piece 63, which will be described in detail below.

As shown in Figures 15 and 16, before the wire is trimmed, the movable shearing piece 62 and the hook piece 63 are open. When the wire needs to be trimmed, the cylinder 71 advances, pushing the lower end of the large angle pull plate 69, the upper end of the large angle pull plate 69 descends, pulling the lower end of the bent pull plate 65, the bent pull plate 65 descends, and the movable shearing piece 62 and the hook piece 63 are driven to move closer to the middle. On the other hand, when the bent pull plate 65 descends, the eccentric tightening ring 66 descends, and the second end of the paddle 67 is pressed down. Correspondingly, the first end of the paddle 67 pushes the bifurcated structure at the end of the bent push plate 64 to swing to the left, and the bent push plate 64 moves closer to the middle to achieve wire trimming.

After the wire cutting is completed, the air cylinder 71 is deflated and withdrawn outward, pulling the lower end of the large angle pull plate 69, and the upper end of the large angle pull plate 69 rises, and the upper end lifts the second end of the paddle 67. Accordingly, the first end of the paddle 67 pushes the forked structure at the end of the bent push plate 64 to swing to the right, and the bent push plate 64 moves outward. At the same time, the upper end of the large angle pull plate 69 rises, pushing the lower end of the bent pull plate 65, and the bent pull plate 65 rises, and the movable shearing plate 62 and the bent hook plate 63 are pushed outward. The wire cutting device 6 is opened. As can be seen from Figure 16, the positions of the bent push plate 64 and the bent hook plate 63 can be staggered.

The front end of the curved push piece 64 is similar to the front end of the hook piece 63, both of which have a hook shape and the hook faces inward (when the front end of the curved push piece 64 and the hook piece 63 are opened, the hook directions of the two face each other), and play the following role: before completing the thread cutting action, the curved push piece 64 pushes the sewing coil, at this time, the movable shearing piece 62 and the hook piece 63 and the fixed shearing piece 61 are not closed yet, leaving a little space, and the curved push piece 64 can push the sewing coil out for a certain length, so as to leave a safe length of the sewing coil. During the thread cutting process, the front end of the hook piece 63 is in the shape of a hook, which can hook the sewing coil 8 to prevent the sewing coil 8 from sliding out of the shearing position. Through the curved push piece 64, the length of the sewing coil left at both ends of the fabric opening can be made consistent after completing the thread cutting action, and the length of the sewing coil left at both ends of the fabric opening can also be controlled by adjusting the position of the eccentric tightening ring 66 (that is, the travel range of the paddle 67), which can be long or short.

In the illustrated embodiment, the thread trimming device 6 is placed below the sewing point of the sewing device 1, and can also be placed above and on both sides. The distance from the thread trimming plane or the thread trimming point of the thread trimming device 6 to the tip of the steel needle 211 is preferably between 10.1-20 mm, and the distance from the thread trimming plane or the thread trimming point to the point where the first sewing needle 3 and the second sewing needle 4 intersect is preferably between 15.1-25 mm. If the distance is too close, there will be mutual interference in the mechanical structure, and if the distance is too far, the thread trimming device will not be able to trim the thread and lose the thread trimming function.

The invention realizes the function of automatically sewing the opening of a cylindrical fabric such as socks, and can automatically cut the sewing coil after the sewing is completed, and the length of the cut coil can be freely adjusted, which greatly improves the production efficiency of the fabric, does not need to perform secondary processing on the fabric to form a finished product, greatly reduces the production cost, and achieves the purpose of automated production. The sewing speed is fast, the sewing is accurate, and the qualified rate of the fabric is greatly improved.

The embodiments described above are only preferred specific implementations of the present invention. The phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments" used in this specification may refer to one or more of the same or different embodiments according to the present disclosure. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

A thread trimming device, characterized by comprising:

Fixed seat (73);

A fixed shearing piece (61) fixed on a fixed seat (73);

A movable shearing piece (62) is fixed on a fixing seat (73) by a latch (74);

A bending and pulling plate (65), the upper end of which is coupled to the end of the movable shear piece (62);

A large-angle pull plate (69), the upper end of which is coupled to the lower end of the bent pull plate (65);

When the lower end of the large-angle pulling plate (69) is pushed or pulled, the movable shearing piece (62) is opened or closed relative to the fixed shearing piece (61).
The thread trimming device according to claim 1, further comprising:

A hook piece (63) is installed together with the movable shear piece (62) and moves together with the movable shear piece (62);

A bending push piece (64) fixed on a fixing seat (73) by a latch (74);

A paddle (67), the first end of which is combined with the end of the bending push plate (64) to push and pull the bending push plate (64), and the second end of which is capable of moving between the eccentric tightening ring (66) on the bending and pulling plate (65) and the upper end of the large-angle pulling plate (69).
The thread trimming device according to claim 2, characterized in that:

The heads of the curved hook piece (63) and the curved push piece (64) are in the shape of curved hooks, and the curved hooks are opposite to each other.
The thread trimming device according to claim 3 is characterized in that:

When the lower end of the large-angle pull plate (69) is pushed, the movable shearing piece (62) approaches the fixed shearing piece (61), and the paddle (67) pushes the bent push piece (64) to move toward the middle. Before cutting the wire, the bent push piece (64) first contacts and pushes out a certain length of the wire to be cut, and then the bent hook piece (63) contacts and tightens the wire to be cut, and the movable shearing piece (62) and the fixed shearing piece (61) cut the wire;

When the lower end of the large-angle pull plate (69) is pulled, the bent hook piece (63) and the movable shear piece (62) move away from the fixed shear piece (61), and the bent push piece (64) moves in relative directions to the bent hook piece (63).
The thread trimming device according to claim 4, further comprising:

A cylinder (71) connected to the lower end of the large-angle pulling plate (69);

A tension spring (70) connects the cylinder (71) and the large-angle tension plate (69).
An automatic suturing device, characterized in that it comprises:

The thread cutting device (6) as claimed in any one of claims 1 to 4;

A sewing device (1) comprising a first sewing needle (3), a second sewing needle (4) and a steel needle (2) which cooperate with each other to tie a knot;

The thread cutting device (6) is located close to the sewing point of the sewing device (1) and cuts the thread of the sewing coil (8) after the sewing of the sewing device (1) is completed.
The automatic sewing device according to claim 6, characterized in that the sewing device (1) further comprises:

A first connecting rod (52), a first end of which is connected to the second end of a long crank (53), a first needle holder (9) being mounted on the first end of the long crank (53), and the first stitching needle (3) being mounted on the first needle holder (9);

The first end of the second connecting rod (56) is connected to the second end of the short crank (57), the first end of the short crank (57) is mounted with a second needle holder (10), and the second stitching needle (4) is mounted on the second needle holder (10).
The automatic suturing device according to claim 7 is characterized in that it also includes a motor device (5), and the motor device (5) includes:

Motor shaft;

A large gear (51) connected to one end of the motor shaft, the large gear (51) having an eccentric mounting hole (511), the eccentric mounting hole (511) being used to accommodate the second end of the first connecting rod (52);

The small needle eccentric wheel (55) is connected to the other end of the motor shaft. The small needle eccentric wheel (55) has an eccentric shaft end (551), and the eccentric shaft end (551) is combined with the second end of the second connecting rod (56).
The automatic suturing device according to claim 8, characterized in that it also includes:

A small gear hand wheel (54) meshes with the large gear (51).
The automatic suturing device according to claim 6 is characterized in that:

The distance from the cutting plane or cutting point of the cutting device (6) to the tip of the steel needle (211) is between 10.1 and 20 mm, and the distance from the cutting plane or cutting point to the point where the first knitting needle (3) and the second knitting needle (4) intersect during movement is between 15.1 and 25 mm.