TWM615919U - Thread cutting device of sewing machine and movable cutter thereof - Google Patents

Abstract

This model relates to a suture cutting device of a sewing machine. It includes a seat plate, a reciprocating mechanism, a swinging mechanism and a cutter set. The reciprocating mechanism includes a moving part, the swinging mechanism includes a swing arm, and the cutter set includes a movable knife and a fixed knife. The knife is fixedly connected to the moving part and correspondingly formed above the swing arm. The fixed knife is fixedly connected to the swing arm and formed above the movable knife. The movable knife includes a first cut part, a second cut part and formed on the first cut part arranged in a longitudinal direction. The hook part between the hook part and the second cutting part, wherein the hook part is clamped between the movable knife and the fixed knife after picking the hook thread, and cuts the thread through the sliding movement of the first cut part relative to the fixed knife. Thereby, the thread tail of the suture can be effectively prevented from getting off the thread.

Description

Thread cutting device of sewing machine and movable knife

This model relates to the technology of a sewing machine, in particular to a thread cutting device of the sewing machine and its movable knife.

The suture cutting device of the existing sewing machine mainly includes a plate body, a reciprocating mechanism, a swing mechanism and all knife groups. The cutting knife group includes a movable knife and a fixed knife. The movable knife has a front cutting part and formed in the front cutting After the movable knife is driven, it will pull the crochet thread and each upper needle thread at the same time to retract inward. Each upper needle thread will first touch the fixed knife and be cut, and then the crochet thread will touch again. It is cut when it touches the fixed knife to complete the thread cutting action.

However, although the thread cutting device of the existing sewing machine has the effect of cutting the hook thread and each upper needle thread, it is still not perfect in actual use. There is no restriction between the needles and threads, and it is easy to cause the undesirable situation of the thread tail falling off.

In view of this, the creators of the new type devote themselves to the above-mentioned shortcomings of the existing technology, and they have devoted themselves to research and cooperate with the application of theories, and try their best to solve the above-mentioned problems, which has become the goal of the new type of creators' improvement.

One purpose of the present invention is to provide a suture cutting device of a sewing machine and its movable knife, which clamp the hook thread during the thread cutting process, thereby effectively preventing the thread tail of the suture from falling off.

In order to achieve the above-mentioned object, the present invention provides a suture cutting device for a sewing machine. The suture includes a hook thread. The suture cutting device includes a plate, a reciprocating mechanism, a swing mechanism, and a knife set. The reciprocating mechanism is arranged on the seat plate, the reciprocating mechanism includes a moving part; the swing mechanism is disposed on the seat plate corresponding to the reciprocating mechanism, the swing mechanism includes a swing arm pivotally connected to the seat plate; the cutter set It includes a movable knife and a fixed knife. The movable knife is fixedly connected to the moving part and formed above the swing arm. The fixed knife is fixedly connected to the swing arm and formed above the movable knife. The movable knife includes A first cut part, a second cut part, and a hook formed between the first cut part and the second cut part arranged longitudinally, wherein the hook part is clamped on the hook after picking up the hook thread A line is cut between the movable knife and the fixed knife through the sliding movement of the first cut relative to the fixed knife.

In order to achieve the above-mentioned object, the present invention provides a movable knife of a suture cutting device. The suture includes a hook thread. The movable knife cooperates with a fixed knife to cut the thread. The movable knife includes a first longitudinally arranged knife. A cutting part, a second cutting part, and a hook formed between the first cutting part and the second cutting part, wherein the hook is clamped between the movable knife and the fixed knife after capturing the hook thread And cut the line through the sliding movement of the first cut relative to the fixed knife.

The new model also has the following functions, not only the positioning is accurate, but also the action of each component is stable. By forming the supporting member inside the swing mechanism, the length of the supporting arm can be shortened and the supporting effect can be stabilized. It also has simple structure, easy assembly, easy maintenance and adjustment, and can be applied to sutures of various tensions.

1: Suture cutting device

10: Seat plate

11: Piercing

12: screw hole

20: Reciprocating mechanism

21: Joystick

211: Toggle Department

22: Moving parts

221: first guide groove

222: second guide groove

223: third guide groove

23: Positioning column

24: fixed element

30: swing mechanism

31: swing arm

311: positioning pin

312: Boss

32: limit plate

321: Convex Column

33: fixed element

34: Clipping piece

40: Cutter set

41: Movable Knife

411: All Part

412: second cut

413: Hook

414: sunken surface

42: fixed knife

50: Supporting parts

60: Thread clamping mechanism

61: upper shrapnel

62: lower shrapnel

63: Arrival

70: wire sheet

71: Cable hole

75: compression spring

751: ring

752: Flexible Arm

8: Cloth

9: Sewing machine

91: base

92: drive device

93: Upper needle thread

94: Crochet thread

Figure 1 is a three-dimensional exploded view of the new suture cutting device.

Figure 2 is a schematic diagram of the combination of the new suture cutting device.

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

Figure 4 is a top view of the movable knife of the present invention.

Figure 5 is a side view of the movable knife of the present invention.

Figure 6 is a schematic diagram of the new type of suture cutting device applied to the sewing machine assembly.

Fig. 7 is a three-dimensional exploded view of the new type of suture cutting device and driving device.

Figure 8 is a diagram of the new type of suture cutting device in use.

Figure 9 is a graph of sewing cloth and stitches processed by the new type of sewing thread cutting device.

The detailed description and technical content of the present invention are described below with the drawings. However, the drawings are only provided for reference and explanation, and are not intended to limit the present invention.

Please refer to Figures 1 to 3, the present invention provides a suture cutting device for a sewing machine and its movable knife. The suture cutting device 1 mainly includes a plate 10, a reciprocating mechanism 20, a swing mechanism 30, and everything else. Knife set 40.

The seat plate 10 is made of metal material and is generally a rectangular flat plate. A plurality of perforations 11 and a plurality of screw holes 12 are spaced apart on the seat plate 10.

The reciprocating mechanism 20 includes a rocker 21, a moving part 22, and a positioning column 23. The rocker 21 is pivotally connected to a screw hole 12 of the seat plate 10 through a fixing element 24 such as a bolt, and is connected to a screw hole 12 of the seat plate 10. A toggle portion 211 is formed at the end. The moving part 22 is approximately in the shape of a "T", and there is a The first guide groove 221 and the second guide groove 222 are provided with a third guide groove 223 on the vertical plate. The third guide groove 223 is used for receiving the aforementioned toggle portion 211. When the rocker 21 is opposite to When the seat plate 10 reciprocates, the movable member 22 can be driven to slide and shift above the seat plate 10 at the same time. The positioning pillar 23 penetrates the first guide groove 221 and is locked in a screw hole 12 of the seat plate 10 to restrict the movement direction and angle of the movable member 22.

The swing mechanism 30 includes a swing arm 31 and a limit plate 32. The swing arm 31 is composed of a horizontal plate and two longitudinal plates respectively extending vertically from the two ends of the horizontal plate, and is roughly in the shape of a "ㄣ". A longitudinal plate of the swing arm 31 is pivotally connected to a screw hole 12 of the seat plate 10 through a fixing element 33 such as a bolt. PIN 311. The limit plate 32 is fixed above the swing arm 31, and the movable member 22 is movably clamped between the limit plate 32 and the seat plate 10, thereby restricting the longitudinal direction of the movable member 22; in addition, the limit plate 32 corresponds to A convex post 321 is connected to one end surface of the seat plate 10, and the convex post 321 is accommodated in the second guide groove 222 to restrict the moving direction and angle of the moving member 22. In addition, a boss 312 is connected to the end of the longitudinal plate of the swing arm 31 away from the seat plate 10.

The cutter set 40 includes a movable knife 41 and a fixed knife 42. Please refer to FIGS. 4 and 5 together. The movable knife 41 includes a first cut portion 411, a second cut portion 412, and a first cut portion 412 formed between the first cut portion 411 and the second cut portion 412 arranged in a longitudinal direction. Hook part 413. The hook portion 413 is provided with a recessed surface 414, so as to generate a line tolerance gap during the sliding process of the movable knife 41 relative to the fixed knife 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.

Please continue to refer to Figures 1 to 3. Further, the suture cutting device 1 of the present invention also includes a supporting member 50 (see Figure 1), which is composed of two L-shaped plates. One end is fixed to the screw hole 12 of the seat plate 10 through 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; in this way, the supporting member can be shortened The length of the supporting arm of 50 and the stability of the supporting swing arm 31 are improved. In addition, 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 end of the clamping piece 34 clamps the bottom surface of the supporting member 50.

Further, the suture cutting device 1 of the present invention further includes a thread clamping mechanism 60, which is fixedly connected to the end of the swing arm 31 away from the seat plate 10. The thread clamping mechanism 60 mainly includes an upper elastic piece 61, a lower elastic piece 62 and A support plate 63, the upper elastic piece 61 is clamped under the boss 312, and its end presses against the bottom surface of the movable knife 41; the lower elastic piece 62 is clamped under the swing arm 31, and its end presses against the bottom surface of the upper elastic piece 61 The abutment plate 63 is fixed under the swing arm 31 by screws, and its end is pressed against the bottom surface of the lower elastic piece 62.

Further, the suture cutting device 1 of the present invention further includes a wire piece 70 and a pressing spring 75. The wire piece 70 is fixedly connected to the bottom surface of the moving part 22, and a drop-shaped thread-through hole 71 is formed in the wire piece 70. , To be suitable for sutures of various tensions. The pressure spring 75 is composed of a central ring 751 and two elastic arms 752 respectively extending outward from the two ends of the ring 751. One of the elastic arms 752 is fixed to the seat plate 10 by screws, and the other elastic arm 752 Then, one side of the moving member 22 is elastically pressed to provide stability of the movement of the moving member 22.

Please refer to Figures 6 to 9, the new type of suture cutting device 1 is installed on a base 91 of a sewing machine 9, and a machine arm (not shown) is connected behind the base 91, this suture cutting device The breaking device 1 is driven by a driving device 92 (as shown in FIG. 7). One end of the driving device 92 is connected to the rocker 21; the other sewing thread includes three upper needle threads 93 and one hook thread 94.

When the sewing machine 9 sews a piece of fabric 8 to a specific section, it can drive the rocker 21 to swing forward with the help of the telescopic movement of the driving rod of the driving device 92. At this time, the toggle part 211 will push the moving part 22 forward. When moving, the moving member 22 is pressed by the pressing spring 75 in the lateral direction, so that it can slide stably on the seat plate 10, and the swing arm 31 is embedded and limited in the second guide groove 222 by the positioning pin 311 , And the limiting plate 32 are embedded and limited in the second guide groove 222 by the protruding posts 321, so that the swing arm 31 drives the limiting plate 32 and the cutter set 40 to rotate outward, and the moving part 22 At the same time it is moved out, the end of the movable knife 41 will protrude from the outside of the fixed knife 42, and the second cutting portion 412 of the movable knife 41 will hook each upper needle thread 93, and the hook portion 413 of the movable knife 41 will pick up the hook. Needle and thread 94.

Subsequently, under the swinging action of the rocker 21 on the movable knife 41, the upper needle threads 93 and the crochet threads 94 are simultaneously pulled to retract toward the fixed knife 42. When each upper needle thread 93 reaches the position of the knife edge of the fixed knife 42 , Will be cut by the second cutting part 412 and the fixed knife 42; then when the movable knife 41 continues to retract toward the fixed knife 42, the hook thread 94 will be clamped between the movable knife 41 and the fixed knife 42 When the crochet thread 94 reaches the position of the knife edge of the fixed knife 42, it will be cut by the first cut 411 and the fixed knife 42, and the crochet thread 94 will be clamped between the movable knife 41 and the upper elastic piece 61. In between, in order to complete the thread trimming and thread clamping actions, and at the same time, it can facilitate the next sewing.

In summary, the thread cutting device and movable knife of the new sewing machine can indeed achieve the intended purpose of use, and solve the lack of conventional knowledge. Because of its novelty and progress, it fully meets the requirements for new patent applications. The application is filed in accordance with the Patent Law, please check carefully and grant the patent for this case to protect the rights of the creator of the new type.

1: Suture cutting device

10: Seat plate

11: Piercing

12: screw hole

20: Reciprocating mechanism

21: Joystick

211: Toggle Department

22: Moving parts

221: first guide groove

222: second guide groove

223: third guide groove

23: Positioning column

24: fixed element

30: swing mechanism

31: swing arm

311: positioning pin

312: Boss

32: limit board

321: Convex Column

33: fixed element

34: Clipping piece

40: Cutter set

41: Movable Knife

42: fixed knife

50: Supporting parts

60: Thread clamping mechanism

61: upper shrapnel

62: lower shrapnel

63: Arrival

70: wire sheet

71: Cable hole

75: compression spring

751: ring

752: Flexible Arm

Claims (10)

A suture cutting device for a sewing machine, the suture includes a hook thread, the suture cutting device includes: a seat plate; a reciprocating mechanism arranged on the seat plate, the reciprocating mechanism including a moving part; a swing Mechanism, corresponding to the reciprocating mechanism arranged on the seat plate, the swing mechanism includes a swing arm pivotally connected to the seat plate; The moving part is correspondingly formed above the swing arm, and the fixed knife is fixedly connected to the swing arm and formed above the movable knife. The movable knife includes a first cut portion, a second cut portion and a forming portion arranged in a longitudinal direction. A hook part between the first cut part and the second cut part, wherein the hook part is clamped between the movable knife and the fixed knife after capturing the hook thread, and passes through the first cut part With respect to the fixed knife, it slides and cuts the line. The thread cutting device for a sewing machine according to claim 1, wherein the hook portion is provided with a lowered surface to form a thread-containing gap between the fixed knife and the movable knife. The thread cutting device of a sewing machine according to claim 1, wherein the moving part is provided with a second guide groove, and the swing arm is connected with a positioning pin accommodated in the second guide groove. The suture cutting device for a sewing machine according to claim 1, which further includes a supporting member, the swing mechanism further includes a clamping piece, and one end of the supporting member is fixed to the seat plate and formed on the swing Inside the mechanism, the other end of the supporting 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 end of the clamping piece is elastically clamped on the supporting piece. The thread cutting device of a sewing machine according to claim 1, further comprising a thread clamping mechanism, which is fixedly connected to the end of the swing arm away from the seat plate. The thread cutting device of a sewing machine according to claim 1, wherein the reciprocating mechanism further includes a rocker and a positioning column, the rocker is pivotally connected to the seat plate, and the movable member is formed above the seat plate and is Driven by the rocker, the moving part is provided with a first guide groove, and the positioning column penetrates the first guide groove and is fixedly connected to the seat plate. The thread cutting device of a sewing machine according to claim 1, wherein the movable member is provided with a second guide groove, and the swing mechanism further includes a limit plate fixed on the swing arm and longitudinally restricting the movable member, One end surface of the limiting plate protrudes from at least one protruding column accommodated in the second guide groove. The suture cutting device of a sewing machine according to claim 1, further comprising a wire piece, the wire piece is fixedly connected to the end of the moving part, and a drop-shaped thread hole is opened in the wire piece. A movable knife of a suture cutting device, the suture includes a hook thread, the movable knife is coordinated with a fixed knife to cut the thread, and the movable knife includes a first cut part, a second cut part and a longitudinally arranged A hook part formed between the first cut part and the second cut part, wherein the hook part is clamped between the movable knife and the fixed knife after capturing the hook thread, and passes through the first cut part The part slides relative to the fixed knife and cuts the line. The movable knife of the suture cutting device according to claim 9, wherein the hook portion is provided with a depressed surface to form a thread-containing gap between the fixed knife and the movable knife.

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