CN221544979U - Wire cutting mechanism - Google Patents

Abstract

The utility model discloses a wire cutting mechanism which comprises a movable cutter and a fixed cutter which are matched with each other, wherein a clamping arm which is matched with the movable cutter by rotating towards the fixed cutter along with the movable cutter is arranged between the movable cutter and the fixed cutter; or/and the movable knife is provided with a clamping arm matched with the needle plate, and the clamping arm matched between the movable knife and the fixed knife is positioned on the path of the movable knife for hooking the wire. According to the needle machine, the needle brings the upper thread end threaded in the needle thread hole of the needle machine to the lower part of the needle plate, the thread cutting moving knife is controlled to hook the upper thread end to move towards the fixed knife, and the moving knife can clamp part or all of the thread end through the clamping arm. After the thread ends are clamped, the thread ends are controlled, and the winding is prevented from being pulled too much. The needle has the advantages that the thread end is fixed, so that the tension of the whole upper thread can be kept to be more than 50gf, the upper thread is kept in a normal sewing state, then the needle is controlled to be put down, embroidery or sewing of stitch is completed, formation of thread bubbles is avoided, and normal embroidery stitch making is facilitated.

Description

Wire cutting mechanism

Technical Field

The utility model relates to a thread cutting mechanism suitable for sewing and embroidery equipment.

Background

The embroidery machine or the sewing machine works to complete the embroidery or sewing of a graphic unit, and thread cutting is performed. After trimming, the upper thread can form free and unbound thread ends. The next needle lifting work is carried by the needle plate to be matched with the rotating shuttle. The rotating shuttle rotates to hook the thread end of the upper thread, so that the thread end is still positioned below the needle plate after the needle moves upwards. The thread end is in an uncontrollable free and unconstrained state, and the rotating shuttle continuously rotates along with the follow-up continuous needle falling and continuous embroidery, so that the rotating shuttle is easy to hook the freely uncontrollable thread end, the thread end is knotted along with the continuous embroidery, and the thread bubble is formed. After embroidery is completed, the thread ends in the embroidery process need to be cleaned, and the thread bubbles cannot be cleaned by the existing follow-up thread end cleaning equipment because the thread bubbles are knotted complete rings. Therefore, the trimming is required to be manually emphasized, which causes great workload for subsequent procedures.

In addition, when the second needle is knotted, the thread end is in a free state, so that the resistance is too small, the free uncontrolled thread end is easily pulled excessively in the thread winding process, the upper thread is loosened, and the thread is easily foamed in the knotting process.

To solve the above problems, the prior art is generally: when the upper thread end is brought below the needle plate, controlling the thread cutting moving knife to hook the upper thread end to move towards the thread cutting fixed knife until stopping at the stopping limit where the thread cutting moving knife and the thread cutting fixed knife are not closed; at this time, the hooked upper thread is limited to the lower thread retainer below the thread cutting moving knife; controlling the machine needle to be needled down to finish embroidery of at least one stitch; and controlling the thread cutting moving knife to move from the stop limit to the thread cutting fixed knife, and cutting the thread end of the thread when the thread cutting moving knife and the thread cutting fixed knife are closed. The technology only controls the thread end in a controllable space range, prevents the thread hook from being hooked again by the rotating shuttle, and can improve the thread end and thread bubble problem to a certain extent, but in actual use, the upper thread needs to bear the tensile force of not less than 50gf (gram force) in the knotting process, the resistance is still too small and is far less than 50gf because the thread end of the upper thread is still in a free state, and the free uncontrolled thread end is easy to excessively drag in the winding process, so that the upper thread is loose, and a large amount of thread bubbles still can appear. The above method or structure cannot be carried out until the practical stage.

Disclosure of Invention

The utility model provides a thread cutting mechanism for embroidery or sewing, which can improve the quality of embroidery or sewing and reduce the formation of thread bubbles in the embroidery process.

The technical scheme for solving the existing problems is as follows: the thread cutting mechanism comprises a movable cutter and a fixed cutter which are matched with each other, and as improvement, a clamping arm which is used for clamping threads in a matched manner by rotating the movable cutter towards the fixed cutter is arranged between the movable cutter and the fixed cutter; or/and the movable knife is provided with a clamping arm matched with the needle plate for clamping the wire, and the clamping arm matched between the movable knife and the fixed knife is positioned on the path of the movable knife for hooking the wire.

As a further improvement, the clamping arm is a clamping arm of an elastic clamping wire.

As a further improvement, the movable knife is provided with a clamping block matched with the corresponding part of the fixed knife or/and the bottom of the needle plate, and the clamping block forms a clamping arm of the movable knife; or/and the fixed knife is provided with a fixed knife clamping block matched with the corresponding part of the movable knife, and the fixed knife clamping block forms a clamping arm of the fixed knife.

As a further improvement, the movable knife comprises a bottom plate capable of rotating around the knife shaft, a movable knife edge arranged on the bottom plate and a rear clamping block arranged on the movable knife edge, wherein the direction of the movable knife moving towards the fixed knife is the front direction, and the direction of the movable knife moving away from the fixed knife is the rear direction.

As a further improvement, the movable knife rotating towards the fixed knife is matched with the fixed knife shearing line before the movable knife is matched with the clamping arm of the fixed knife.

Compared with the prior art, the utility model has the advantages that the clamping arm is arranged on the movable knife to be matched with the needle plate, or the clamping arm is arranged between the movable knife and the fixed knife. The needle brings the upper thread end threaded in the needle thread hole to the lower part of the needle plate, and the movable cutter controls the movable cutter to hook the upper thread end to move towards the fixed cutter, and the movable cutter can clamp part or all of the thread end through the clamping arm. After the thread ends are clamped, the thread ends are controlled, and the winding is prevented from being pulled too much. The needle has the advantages that the thread end is fixed, so that the tension of the whole upper thread can be kept to be more than 50gf, the upper thread is kept in a normal sewing state, then the needle is controlled to be put down, embroidery or sewing of stitch is completed, formation of thread bubbles is avoided, and normal embroidery stitch making is facilitated.

Drawings

Fig. 1 is a schematic view of the structure of the needle after the needle brings the thread into the lower part of the needle plate.

Fig. 2 is a schematic diagram of the structure of the movable knife for hooking the thread end after the needle brings the thread end under the needle plate.

Fig. 3 is an enlarged schematic view at a of fig. 2.

Fig. 4 is a schematic structural view of a movable cutter hook wire head.

Fig. 5 is a schematic diagram of the structure at b of fig. 4.

Fig. 6 is a schematic structural view of a clamping arm for clamping a wire end by matching a movable knife with a fixed knife.

Fig. 7 is a schematic view of the structure at c of fig. 6.

Fig. 8 is a schematic diagram of the structure of the movable knife and the fixed knife.

Fig. 9 is a schematic view of another view angle structure of the movable knife and the fixed knife.

Fig. 10 is a schematic structural view of the movable blade and the stationary blade in a clamped state after cutting the wire.

Fig. 11 is a top view of an embroidered site.

Fig. 12 is a cross-sectional view taken along A-A of fig. 11.

Fig. 13 is an enlarged schematic view at c of fig. 12.

Detailed Description

Referring to fig. 1-13, the utility model also discloses a thread cutting mechanism, which comprises a movable cutter 1 and a fixed cutter 2 which are matched with each other, wherein a clamping arm 3 which is matched with each other to clamp a thread by rotating the movable cutter 1 to the fixed cutter 2 is arranged between the movable cutter 1 and the fixed cutter 2. Or/and the movable blade 1 is provided with a clamping arm 3 which cooperates with the needle plate 5 to clamp the thread, as shown in fig. 12-13. The clamping arm 3 matched between the movable knife and the fixed knife is positioned on the path of the line hooked by the movable knife 1 on the movable knife 1. The movable knife 1 and the fixed knife 5 can be matched to clamp the thread end; or/and the movable knife 1 is matched with the needle plate 5 to clamp the upper thread.

In the embodiment of the present utility model, as a mode of the clamping arm 3, the clamping arm 3 may be formed by a mating surface of the upper blade surface of the movable blade 1 and the fixed blade 2.

The clamping arm 3 is a clamping arm for elastically clamping the wire.

The movable knife 1 is provided with a clamping block 11 matched with the corresponding part of the fixed knife 2 or/and matched with the bottom of the needle plate 5, and the clamping block 11 forms a clamping arm 3 of the movable knife 1. Or/and the fixed knife 2 can be also provided with a fixed knife clamping block matched with the corresponding part of the movable knife 1, and the fixed knife clamping block forms a clamping arm of the fixed knife 2.

The movable knife 1 comprises a bottom plate capable of rotating around a knife shaft, a movable knife edge 12 arranged on the bottom plate and a rear clamping block 11 arranged on the movable knife edge 12, wherein the direction of the movable knife 1 moving towards the fixed knife 2 is the front, and the direction of the movable knife 1 moving away from the fixed knife is the rear.

If the thread end is clamped by the movable knife and the fixed knife, the movable knife 1 rotating towards the fixed knife 2 is matched with the fixed knife 2 in a thread cutting way, and the movable knife 1 is matched with the clamping arm 3 of the fixed knife 2 before the thread is cut.

In order to facilitate explanation of the above structure, the present utility model also discloses a method for embroidering or sewing and trimming threads, wherein the needle 4 is positioned above the needle plate 5 in an initial state, and a cloth to be embroidered or sewn can be placed above the needle plate 5. After the embroidery machine or the sewing machine is started, the working steps are as follows:

And 1, controlling the needle 4 to be placed down, and enabling the needle 4 to bring the upper thread end threaded in the thread hole of the needle 4 to the lower part of the needle plate.

Step 2, controlling the movable cutter 1 for cutting the upper thread to hook the upper thread end and move towards the fixed cutter 2, wherein the movable cutter 1 for moving can clamp part or all of the thread end between the movable cutter 1 and the clamping arm 3 of the fixed cutter 2; referring to fig. 12-13 or moving knife 1, a portion or all of the thread end is clamped between the clamping arm 3 of the moving knife 1 and the needle plate 5. The thread end can be clamped between the movable knife 1 and the fixed knife 2 by the movement of the movable knife 1 to the fixed knife; the thread end can also be clamped between the movable knife 1 and the needle plate 5. Or any two or three of the above schemes may be arbitrarily combined.

And 3, controlling the needle 4 to be needled down to finish embroidery or sewing of at least one stitch.

In the embodiment of the present utility model, as a mode of the clamping arm 3, the clamping arm 3 may be formed by a mating surface of the upper blade surface of the movable blade 1 and the fixed blade 2. As shown in fig. 4-5, the upper thread end can be clamped between the upper surface of the movable cutter and the lower surface of the fixed cutter.

Preferably, in order to facilitate thread hooking, thread cutting and thread clamping, in step 1, the needle 4 is controlled to be driven down, and the movable cutter 1 is controlled to be opened before passing through the needle plate hole 51, so that the upper thread passes through the space between the fixed cutter 2 and the movable cutter 1 from the needle plate hole 51 and then enters the rotating shuttle to be matched with the rotating shuttle. Or after the thread end of the upper thread is brought below the needle plate 5, the brake knife 1 is controlled to be opened at the latest before the next needle 4 passes through the needle plate hole, so that the upper thread can pass through the space between the fixed knife 2 and the movable knife 1, and the upper thread can be hooked by the passive knife.

The structure of the movable blade 1 and the fixed blade 2 and the moving structure of the movable blade 1 can be the structure of the prior art. The movable knife 1 can move towards the fixed knife 2 to cut lines and move towards the opposite fixed knife 2 to open.

In the step 2, the movable cutter 1 for hooking the thread ends moves towards the fixed cutter 2, and when the movable cutter 1 and the fixed cutter 2 are closed to cut the thread ends of the upper threads, the thread end allowance part connected with the upper threads is just clamped; or the thread end allowance part connected with the upper thread is clamped by a driven tool clamping arm and a needle plate along with the movement of the movable knife 1 to the fixed knife 2. The thread end which is the thread end allowance part connected with the upper thread is cut from a certain position of the non-thread end root part of the thread end section, and the thread end part is also connected with the upper thread, and the thread end part is just clamped when the thread end is cut, or is clamped along with the movement of the movable cutter 1 to the fixed cutter 2.

After thread trimming, the thread ends are uniform in length, the thread end allowance part connected with the upper thread is clamped, so that the embroidery thread is conveniently drawn tightly, the integral tension of the thread conveying side and the thread end side of the upper thread is kept stable, the thread ends cannot break loose from the bottom thread, and thread bubbles can be completely eliminated.

The movable knife 1 moving towards the fixed knife 2 is stopped at the matching position of the clamping arm 3 between the movable knife 1 and the fixed knife 2; the clamping arm 3 between the movable knife 1 and the fixed knife 2, namely the corresponding part between the movable knife 1 and the fixed knife 2 is provided with the matched clamping arm 3, or the clamping line part forms the clamping arm 3. At least one of the clamping arms 3 is provided with elasticity for clamping the thread, which facilitates clamping the thread end.

Claims (6)

1. The utility model provides a cut line mechanism, includes mutually supporting movable knife and stationary knife, its characterized in that: a clamping arm which is matched with the clamping line by rotating the follow-up knife towards the fixed knife is arranged between the movable knife and the fixed knife; or/and the movable knife is provided with a clamping arm matched with the needle plate for clamping the wire, and the clamping arm matched between the movable knife and the fixed knife is positioned on the path of the movable knife for hooking the wire.

2. The thread cutting mechanism as recited in claim 1, wherein: the clamping arms are elastic clamping arms for clamping the wires.

3. The thread cutting mechanism as recited in claim 1, wherein: the movable knife is provided with a clamping block matched with the corresponding part of the fixed knife or/and the bottom of the needle plate, and the clamping block forms a clamping arm of the movable knife.

4. The thread cutting mechanism as recited in claim 1, wherein: the fixed knife is provided with a fixed knife clamping block matched with the corresponding part of the movable knife, and the fixed knife clamping block forms a clamping arm of the fixed knife.

5. The thread cutting mechanism as recited in claim 1, wherein: the movable knife comprises a bottom plate capable of rotating around the knife shaft, a movable knife edge arranged on the bottom plate and a rear clamping block arranged on the movable knife edge, wherein the direction of the movable knife moving towards the fixed knife is the front direction, and the direction of the movable knife moving away from the fixed knife is the rear direction.

6. The thread cutting mechanism as recited in claim 1, wherein: the movable knife rotating towards the fixed knife is matched with the fixed knife shearing line, and is matched with the clamping arm of the fixed knife before the movable knife.