CN115161899A - Sewing thread cutting device of sewing machine and movable knife thereof - Google Patents

Abstract

The application relates to a sewing machine's suture cutting device and activity sword thereof, sewing machine's suture cutting device includes the bedplate, reciprocating mechanism, swing mechanism and cutter unit, reciprocating mechanism includes the moving member, swing mechanism includes the swing arm, cutter unit includes activity sword and stationary knife, the activity sword rigid coupling is at the moving member and corresponds and form in the swing arm top, the stationary knife rigid coupling is in the swing arm and is formed in the activity sword top, the activity sword is including the first portion of cutting that is longitudinal arrangement, the second is cut the portion and is formed the portion of colluding between first portion of cutting and second portion of cutting, wherein collude the portion centre gripping between activity sword and stationary knife behind the pick-up crochet needle line, and do to slide and tangent line for the stationary knife through first portion of cutting. Therefore, the thread tail of the sewing thread can be effectively prevented from being separated.

Description

Sewing thread cutting device of sewing machine and movable knife thereof

Technical Field

The present application relates to a sewing machine, and more particularly, to a thread cutting device and a movable knife thereof.

Background

The present sewing machine thread cutting device mainly comprises a plate body, a reciprocating mechanism, a swinging mechanism and a cutter set, wherein the cutter set comprises a movable cutter and a fixed cutter, the movable cutter is provided with a front cutting part and a rear cutting part formed behind the front cutting part, the movable cutter is driven to simultaneously pull a needle hooking thread and each needle hooking thread to retract inwards, wherein each needle hooking thread firstly touches the fixed cutter to be cut off, and then the needle hooking thread touches the fixed cutter to be cut off, so as to finish the thread cutting action.

However, the conventional sewing machine thread cutting device has a cutting effect on the hook thread and the upper needle threads, but is still not perfect in practical use, and the upper needle threads are not limited to the hook thread after being cut by the fixing knife, so that the problem of thread end separation is easily caused.

In view of the above, the present inventors have made extensive studies and scientific applications to solve the above problems, and have made an improvement on the present invention.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a thread cutting device of a sewing machine and a movable knife thereof, which can effectively prevent the thread end of the thread from being separated from the thread by clamping a crochet hook thread during the thread cutting process.

In order to achieve the above object, the present application provides a thread cutting device of a sewing machine, the thread includes a crochet hook thread, the thread cutting device includes a base plate, a reciprocating mechanism, a swing mechanism and a cutter group, the reciprocating mechanism is arranged on the base plate, the reciprocating mechanism includes a moving member; the swinging mechanism is arranged on the seat plate corresponding to the reciprocating mechanism and comprises a swinging arm pivoted on the seat plate; the cutter group comprises a movable cutter and a fixed cutter, wherein the movable cutter is fixedly connected to the moving part and correspondingly formed above the swing arm, the fixed cutter is fixedly connected to the swing arm and correspondingly formed above the movable cutter, the movable cutter comprises a first cutting part, a second cutting part and a hook part, the first cutting part and the second cutting part are longitudinally arranged, the hook part is formed between the first cutting part and the second cutting part, the hook part is clamped between the movable cutter and the fixed cutter after the hook needle line is captured, and the first cutting part slides relative to the fixed cutter to cut the line.

In order to achieve the above-mentioned objectives, an embodiment of the present invention provides a movable knife of a suture cutting device, the suture includes a needle-hooking line, the movable knife cooperates with a fixed knife to cut a thread, the movable knife includes a first cutting portion, a second cutting portion and a hook portion formed between the first cutting portion and the second cutting portion, the first cutting portion is clamped between the movable knife and the fixed knife after the hook needle line is captured, and the thread is cut by sliding the first cutting portion relative to the fixed knife.

The embodiment of the application also has the following effects that the positioning is accurate and the actuation of each component member is stable. The bearing part is formed in the swing mechanism, so that the length of the bearing arm can be shortened and the bearing arm has a stable supporting effect. It also has the advantages of simple structure, easy assembly, easy maintenance and adjustment and can be applied to various sutures with different tensions.

Drawings

Fig. 1 is an exploded perspective view of a suture severing device according to an embodiment of the present application.

Fig. 2 is a schematic view of a suture cutting device assembly according to an embodiment of the present application.

Fig. 3 is a bottom perspective view of fig. 2.

Fig. 4 is a top view of a moveable blade in accordance with an embodiment of the present application.

Fig. 5 is a side view of a moveable blade according to an embodiment of the present application.

Fig. 6 is a schematic view of a suture cutting device according to an embodiment of the present application applied to a sewing machine.

Fig. 7 is an exploded perspective view of the suture severing device and drive device of an embodiment of the present application.

Fig. 8 is a state diagram of the suture cutting device according to the embodiment of the present application in use.

Fig. 9 is a view of a cloth and stitches produced by the suture cutting device according to the embodiment of the present application.

Description of the reference numerals:

1, a suture cutting device;

10, a seat board;

11, perforating;

12, screw holes;

20, a reciprocating mechanism;

21, a rocker;

211, a toggle part;

22, a moving member;

221, a first guide groove;

222, a second guide groove;

223 a third guide groove;

23, positioning columns;

24, a fixing element;

30, a swing mechanism;

31, a swing arm;

311, a positioning pin;

312, a boss;

32, limiting plate;

321 is a convex column;

33, a fixing member;

34, clamping sheets;

40, a cutter group;

41, a movable knife;

411 is a first cut part;

412, a second cut;

413 hook part;

414, a depressed surface;

42, a fixed knife;

50, a supporting piece;

60, a wire clamping mechanism;

61, upper elastic sheet;

62, a lower elastic sheet;

63, a resisting plate;

70, lead sheets;

71, a wire through hole;

75, pressing the spring;

751, a ring;

752 elastic arm;

8, distributing;

9, sewing machine;

91, a base;

92, a driving device;

93, needle thread feeding;

and 94, hooking the needle thread.

Detailed Description

The following description and the accompanying drawings are provided for the purpose of illustration and description, and are not intended to limit the embodiments of the present application.

Referring to fig. 1 to 3, the present application provides a thread cutting device of a sewing machine and a movable knife thereof, wherein the thread cutting device 1 mainly includes a seat plate 10, a reciprocating mechanism 20, a swinging mechanism 30 and a cutter group 40.

The seat plate 10 is made of metal material, and is a rectangular plate, and a plurality of through holes 11 and a plurality of screw holes 12 are spaced apart from each other on the seat plate 10.

The reciprocating mechanism 20 includes a rocker 21, a moving member 22 and a positioning post 23, wherein the rocker 21 is pivotally connected to the screw hole 12 of the seat plate 10 through a fixing element 24 such as a bolt, and a toggle portion 211 is formed at the end of the rocker 21. The moving member 22 is generally "T" shaped, and the horizontal plate is formed with a first guide slot 221 and a second guide slot 222, and the vertical plate is formed with a third guide slot 223, wherein the third guide slot 223 is used for accommodating the toggle portion 211, and when the rocker 21 reciprocates relative to the seat plate 10, the moving member 22 is driven to slide above the seat plate 10. The positioning post 23 passes through the first guiding groove 221 and is locked in the screw hole 12 of the seat plate 10 to limit the moving direction and angle of the moving member 22.

The swing mechanism 30 includes a swing arm 31 and a limit plate 32, wherein the swing arm 31 is formed by a transverse plate and two longitudinal plates vertically extending from two ends of the transverse plate, and is approximately in a shape of '12579'. The limiting plate 32 is fixed above the swing arm 31, and movably clamps the moving member 22 between the limiting plate 32 and the seat plate 10, so as to limit the longitudinal direction of the moving member 22; the end surface of the limiting plate 32 corresponding to the seat plate 10 is connected with a convex pillar 321, and the convex pillar 321 is accommodated in the second guide groove 222 to limit the moving direction and angle of the moving member 22. Also, a boss 312 is connected at the longitudinal plate end of the swing arm 31 remote from the seat plate 10.

Referring to fig. 4 and 5, the cutter set 40 includes a movable cutter 41 and a fixed cutter 42, wherein one end of the movable cutter 41 is fixed to the end of the moving member 22 by screws, and extends along the direction of the swing arm 31 and is formed above the swing arm 31, and the movable cutter 41 includes a first cutting portion 411, a second cutting portion 412 and a hook portion 413 formed between the first cutting portion 411 and the second cutting portion 412. The hook 413 is provided with a depressed surface 414 so that a wire-accommodating gap can be generated during the sliding of the movable blade 41 relative to the stationary blade 42. The fixed knife 42 is fixedly connected to the boss 312 of the swing arm 31 and correspondingly formed above the movable knife 41.

With reference to fig. 1 to 3, the suture cutting device 1 of the embodiment of the present application further includes a supporting member 50 (shown in fig. 1), which is formed by combining two L-shaped plates, one end of the supporting member is fixedly connected to the screw hole 12 of the seat plate 10 by a screw, and is formed inside the swing mechanism 30, and the other end of the supporting member 50 supports the bottom surface of the swing arm 31; thus, the arm length of the support 50 can be shortened and the stability of the support swing arm 31 can be improved. The swing mechanism 30 further includes a clamping piece 34, the clamping piece 34 is fixed to the bottom surface of the swing arm 31, and the bottom surface of the supporting member 50 is clamped by the end of the clamping piece 34.

Further, the suture cutting device 1 according to the embodiment of the present application further includes a thread clamping mechanism 60 fixedly connected to the end of the swing arm 31 far away from the seat plate 10, the thread clamping mechanism 60 mainly includes an upper elastic sheet 61, a lower elastic sheet 62 and a supporting plate 63, the upper elastic sheet 61 is clamped below the boss 312, and the end of the upper elastic sheet is supported against the bottom surface of the movable knife 41; the lower elastic sheet 62 is clamped below the swing arm 31, and the tail end of the lower elastic sheet presses against the bottom surface of the upper elastic sheet 61; the abutting plate 63 is fixed below the swing arm 31 by screws, and the end thereof abuts against the bottom surface of the lower spring plate 62.

Further, the suture cutting device 1 according to the embodiment of the present application further includes a wire guiding sheet 70 and a pressing spring 75, the wire guiding sheet 70 is fixedly connected to the bottom surface of the moving member 22, and a drop-shaped thread passing hole 71 is formed thereon, so as to be suitable for various sutures with different tensions. The pressing spring 75 is composed of a central ring 751 and two elastic arms 752 extending outward from two ends of the ring 751, wherein one elastic arm 752 is fixed to the seat plate 10 by a screw, and the other elastic arm 752 elastically presses one side of the moving member 22, thereby providing stability for the moving member 22.

Referring to fig. 6 to 9, the thread cutting device 1 according to the embodiment of the present invention is mounted on a base 91 of a sewing machine 9, and a boom (not shown) is connected to the rear of the base 91, the thread cutting device 1 is driven by a driving device 92 (shown in fig. 7), and one end of the driving device 92 is connected to a rocker 21; the suture further comprises three needle-feeding lines 93 and one needle-hooking line 94.

When the sewing machine 9 sews the fabric 8 to a specific section, the rocker 21 is driven to swing forward by the telescopic movement of the driving rod of the driving device 92, at this time, the toggle portion 211 pushes the moving member 22 to move forward, the side of the moving member 22 is pushed by the pressing spring 75, so that the moving member can stably slide on the seat plate 10, the swing arm 31 is embedded and limited in the second guide slot 222 by the positioning pin 311, and the limit plate 32 is embedded and limited in the second guide slot 222 by the protruding columns 321, so that the swing arm 31 drives the limit plate 32 and the cutter group 40 to swing outward, and when the moving member 22 moves out, the end of the movable knife 41 protrudes out of the fixed knife 42, and the second cutting portion 412 of the movable knife 41 hooks each upper needle 93, and the hooking portion 413 of the movable knife 41 captures the hooking needle 94.

Then, under the action of the swinging back of the rocker 21, the movable knife 41 will simultaneously pull each upper needle thread 93 and the hook needle thread 94 to retract towards the fixed knife 42, and each upper needle thread 93 will be cut by the second cutting part 412 and the fixed knife 42 when reaching the cutting edge position of the fixed knife 42; when the movable knife 41 continues to retract towards the fixed knife 42, the crochet hook line 94 is clamped in the line accommodating gap between the movable knife 41 and the fixed knife 42, when the crochet hook line 94 reaches the knife edge position of the fixed knife 42, the crochet hook line 94 is cut off by the first cutting part 411 and the fixed knife 42 together, and the crochet hook line 94 is clamped between the movable knife 41 and the upper elastic sheet 61, so that the actions of cutting and clamping the line are completed, and the next sewing is facilitated.

To sum up, the sewing machine suture cutting device and the movable knife thereof of the embodiment of the application can achieve the expected use purpose, thereby solving the problems in the prior art.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, so that all changes, such as equivalents and means, which are made by applying the contents of the specification and the drawings of the present application are all included in the scope of the present application.

Claims (10)

1. A suture cutting device of a sewing machine, characterized in that a suture includes a hook wire, the suture cutting device comprising:

a seat plate;

the reciprocating mechanism is arranged on the seat plate and comprises a moving piece;

the swinging mechanism is arranged on the seat plate corresponding to the reciprocating mechanism and comprises a swinging arm pivoted on the seat plate; and

knife group, including activity sword and stationary knife, the activity sword rigid coupling is in the moving member and correspond to be formed at the swing arm top, stationary knife then the rigid coupling is in the swing arm and be formed at the activity sword top, the activity sword is including the first cutting portion, the second cutting portion and the formation that are longitudinal arrangement first cutting portion with the second cuts the portion of colluding between the portion, wherein collude the portion and is retrieving behind the crochet hook line centre gripping be in the activity sword with between the stationary knife, and pass through first cutting portion for the stationary knife is done to slide and tangent line.

2. The thread cutting device for sewing machine according to claim 1, wherein the hook is provided with a depressed surface to form a thread accommodating gap between the stationary blade and the movable blade.

3. The thread cutting device for sewing machine according to claim 1, wherein the swing arm is connected with a positioning pin housed inside the second guide groove.

4. The thread cutting device of a sewing machine according to claim 1, further comprising a support member, wherein the swing mechanism further comprises a clamping piece, one end of the support member is fixedly connected to the seat plate and formed inside the swing mechanism, the other end of the support member is supported on the bottom surface of the swing arm, the clamping piece is fixedly connected to the bottom surface of the swing arm, and the tail end of the clamping piece is elastically clamped to the support member.

5. The thread cutting device of sewing machine as claimed in claim 1, further comprising a thread clamping mechanism fixed to an end of said swing arm remote from said seat plate.

6. The thread cutting device of a sewing machine according to claim 1, wherein the reciprocating mechanism further comprises a rocker and a positioning post, the rocker is pivotally connected to the base plate, the moving member is formed above the base plate and driven by the rocker, the moving member defines a first guide slot, and the positioning post is inserted through the first guide slot and is fixedly connected to the base plate.

7. The thread cutting device of a sewing machine according to claim 1, wherein the moving member is provided with a second guide groove, the swing mechanism further comprises a stopper plate fixed to the swing arm and longitudinally restricting the moving member, and at least one boss accommodated in the second guide groove is protruded from an end surface of the stopper plate.

8. The thread cutting device of a sewing machine according to claim 1, further comprising a thread guide piece fixed to a distal end of the moving plate and provided with a drop-shaped thread passing hole.

9. The utility model provides a suture cutting device's activity sword, its characterized in that, the suture includes the crochet hook line, activity sword and stationary knife cooperation tangent line, the activity sword is including being the first cutting portion of longitudinal arrangement, second cutting portion and forming first cutting portion with collude the portion between the second cutting portion, wherein collude the portion and is retrieving behind the crochet hook line the centre gripping be in the activity sword with between the stationary knife, and pass through first cutting portion for the stationary knife does to slide and the tangent line.

10. The movable blade of the suture severing device of claim 9, wherein the hook is provided with a depressed surface to form a wire receiving gap between the stationary blade and the movable blade.

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