CN116288977A

CN116288977A - Thread cutting method of embroidery machine

Info

Publication number: CN116288977A
Application number: CN202310038992.6A
Authority: CN
Inventors: 陈天龙; 方狄永; 陈斌
Original assignee: Zhejiang Pumeike Intelligent Embroidery Equipment Co ltd
Current assignee: Zhejiang Pumeike Intelligent Embroidery Equipment Co ltd
Priority date: 2023-01-06
Filing date: 2023-01-13
Publication date: 2023-06-23
Anticipated expiration: 2043-01-13
Also published as: CN116288977B

Abstract

The present disclosure relates to the technical field of embroidery machines. The thread cutting method of the embroidery machine is realized by adopting a thread cutting device of the embroidery machine, wherein an embroidery thread holding structure is arranged between a movable cutter and a fixed cutter, and a thread pulling rod is arranged below the movable cutter and above a rotating shuttle support; the method comprises the following steps: step S10, controlling the needle to be in a needle position, and bringing the upper thread to the lower part of the needle plate; step S20, after the upper thread is brought below the needle plate, controlling the brake knife to hook the upper thread head to move towards the fixed knife until stopping at the stop limit where the movable knife and the fixed knife are not closed; at this time, the hooked upper thread is limited to the embroidery thread retaining structure, and the upper thread is poked by the thread poking rod, so that the thread end part of the upper thread to be cut is poked to face the outer side of the rotating shuttle; step S30, controlling the needle to be needled down to finish embroidery of at least one stitch; and S40, controlling the movable knife to move from the stop limit to the fixed knife, and cutting off the line head of the line when the movable knife and the fixed knife are closed. According to the method of the embodiment of the disclosure, the excessive thread ends of the upper thread can be prevented from being brought into the stitch, so that the excessive thread ends are generated below the cloth cover.

Description

Thread cutting method of embroidery machine

Technical Field

Embodiments of the present disclosure relate generally to the field of computerized embroidery machines, and in particular to a thread cutting method for an embroidery machine.

Background

Currently, in the embroidery machine industry, when embroidery finishes one graphic unit and starts to embroider another graphic unit, thread cutting treatment is required to be carried out on upper threads and lower threads below the cloth cover. The structure of the existing embroidery machine comprises an embroidery machine head, a thread buckling device and a thread cutting device. Specifically, an upper thread driven by a needle of the embroidery machine passes through the cloth cover and is hooked by the rotating shuttle and separated into front and rear two strands, a coil (similar to a triangle coil) is formed between the front and rear two strands and is held by the thread buckling device, the bottom thread in the rotating shuttle is wrapped by the rotating shuttle (at the moment, the bottom thread is positioned at the middle position of the coil), after knotting is completed, a thread and the bottom thread are cut by the thread cutting device, and the cut thread and the bottom thread forming thread head are positioned below the cloth cover. When a coil and a loop are formed after the bottom thread is cut off, if the thread end of the upper thread is not bound, the condition that the embroidery thread cannot be tightly pulled easily occurs, the bottom thread is struggled easily due to too loose stitch, a thread loop is easily generated, and even the thread is broken; when the thread ends are bound, the upper thread ends are in a natural state; if the upper thread ends in the natural state are too long, the upper thread ends are brought into the rotating shuttle when the upper thread ends are raised after the upper thread ends are bound, and the too long upper thread ends are brought into the lower part of the cloth surface again, so that redundant threads are formed below the cloth surface, and the quality of embroidery products is affected; if the thread end is not discharged in time after being cut, the thread end is also carried into the rotating shuttle again. In practical application, it is found that a certain length of thread end needs to be left when the embroidery thread can be drawn, and the length often causes that the thread end is easily brought by the rotating shuttle and brought under the cloth cover again, and the contradictory problem of the thread end and the rotating shuttle causes that the thread cutting device of the existing embroidery machine cannot solve the technical problem.

Taking the applicant's prior invention application CN202110459465.3 as an example, the application discloses a thread cutting device of an embroidery machine and a thread cutting method of the embroidery machine, and specifically discloses a thread cutting device which comprises a fixed cutter, a movable cutter and an embroidery thread holding structure arranged between the movable cutter and the fixed cutter; the embroidery thread retaining structure is used for starting a needle to bind a bottom thread and/or an upper thread end between an acting part of the embroidery thread retaining body and the movable cutter after the bottom thread is cut normally; the movable knife driving mechanism drives the movable knife to move towards the fixed knife, and when the movable knife moves, the end head of the movable knife shear line of the movable knife fork out a bottom line and an upper line to be sheared and moves towards the fixed knife continuously until the movable knife is overlapped with the fixed knife, the movable knife blade and the fixed knife blade jointly act to shear the bottom line and the upper line. The invention also discloses a line cutting method based on the device. The applicant finds that in practical application, the scheme realizes the binding and pressing effect of the embroidery thread through the embroidery thread retaining structure, also realizes the stable state of stitch locking after needle starting, and also controls the thread end length to a certain extent so as to solve the problem of different thread end lengths on embroidery products. However, the shortest thread ends after shearing still have the advantages of being slightly longer, the thread ends are unstable in orientation, the rotating shuttle can bring the upper thread ends again with a certain probability when the needle is started after the thread ends are bound, so that the thread ends are brought under the cloth cover again, namely, the thread ends are brought into the stitch, redundant threads are formed under the cloth cover, and the quality of embroidery products is affected; in addition, the embroidery threads made of different materials have different elasticity, the length between thread ends has errors, and the longer thread ends are more likely to generate unstable condition of being brought into stitch by the rotating shuttle for the second time.

Aiming at the prior invention application, the applicant further provides a new improvement scheme, which not only can realize the effects of binding the upper thread and locking the stitch before trimming, but also can solve the problem that the upper thread is excessively long and brought into the rotating shuttle after the needle is lifted after binding and the thread end is sheared, and then the upper thread is secondarily brought into the stitch to form redundant threads below the cloth surface.

Disclosure of Invention

Embodiments of the present disclosure provide an embroidery machine thread cutting method that aims to address one or more of the above problems and other potential problems.

According to a first aspect of the present disclosure, there is provided a thread cutting method of an embroidery machine, implemented by using a thread cutting device of the embroidery machine provided with a thread holding structure between a movable knife and a stationary knife, the method being applied to a control end of the embroidery machine, the thread cutting device of the embroidery machine further comprising a thread pulling rod provided below the movable knife and above a rotating shuttle support, and a thread pulling driving mechanism for driving the thread pulling rod to move; the method comprises the following steps:

step S10, controlling the needle to be in a needle position, and bringing the upper thread to the lower part of the needle plate;

step S20, after the upper thread is brought below the needle plate, controlling the brake knife to hook the upper thread head to move towards the fixed knife until stopping at the stop limit where the movable knife and the fixed knife are not closed; at this time, the hooked upper thread is limited to the embroidery thread holding structure, and the upper thread is poked by the thread poking rod, so that the thread end part of the upper thread to be cut is poked to face the outer side of the rotating shuttle; the outer side of the rotating shuttle is an outer side which is far away from the mounting surface of the rotating shuttle shell and faces the direction of an operator;

step S30, controlling the needle to be needled down to finish embroidery of at least one stitch;

and S40, controlling the movable knife to move from the stop position to the fixed knife, and cutting off the line head of the line when the movable knife and the fixed knife are closed.

According to the method disclosed by the embodiment of the invention, the inherent structure of the thread cutting device of the existing embroidery machine is not required to be changed, and the technical problems can be solved only by installing the thread pulling rod and the thread pulling driving mechanism on the thread cutting device of the embroidery machine and matching with the thread cutting of the scissors. That is, under the effect of upper thread binding and stitch locking by the embroidery thread retaining structure, the thread end part of the upper thread to be cut can be separated from the rotating shuttle, so that the thread end is prevented from being secondarily brought into the stitch.

In some embodiments, the movement track of the thread pulling rod from the origin to the pulling upper thread towards the outer side of the rotating shuttle is a movement track of the inner side of the movement track projected by the arc of the driven knife to the outer side of the movement track; the moving knife arc projection motion track is a motion track projected on a plane where a thread pulling rod is located by a track line of the bottom of a moving knife thread cutting end of a moving knife for hooking a facial thread around the axis of a moving knife bar.

In some embodiments, the thread pulling driving mechanism drives the thread pulling rod to move linearly so as to pull the thread end part of the thread to be cut towards the outer side of the rotating shuttle.

In some embodiments, the thread pulling driving mechanism drives the thread pulling rod to move in an arc manner so as to pull the thread end part of the thread to be cut towards the outer side of the rotating shuttle.

In some embodiments, the thread-holding structure is a spring or a fibrous structure, or an elastic structure composed of rubber or plastic or silicone.

In some embodiments, the step S20 includes:

step S21, after the upper thread is brought below the needle plate, controlling the brake knife to hook the upper thread head to move towards the fixed knife until stopping at the stop limit where the movable knife and the fixed knife are not closed;

step S22, when the movable knife stops at the stop limit, the hooked upper thread is limited to the embroidery thread holding structure; and then the thread pulling rod is controlled to pull the upper thread, so that the thread end part of the upper thread to be cut is pulled to face the outer side of the rotating shuttle.

In some embodiments, the step S20 includes: when the upper thread is brought below the needle plate, the brake knife is controlled to hook the upper thread end to move towards the fixed knife until the upper thread end stops at the stop limit where the movable knife and the fixed knife are not closed; during the movement, the thread pulling rod is controlled to pull the upper thread, so that the thread end part of the upper thread to be cut is pulled to face the outer side of the rotating shuttle.

In some embodiments, the method further includes a step S50 of controlling the brake to open, when the binding effect on the thread end between the movable knife and the thread-embroidering holding structure is weakened, controlling the thread pulling rod to move a certain distance to the outer side of the rotating shuttle, and returning before the movable knife moves towards the fixed knife to execute the next closing thread cutting of the scissors.

In some embodiments, the method further includes a step S50 of controlling the brake to open, and controlling the thread pulling lever to return before the brake moves toward the fixed cutter to perform the next closing thread cutting operation of the scissors after the binding action on the thread end of the upper thread between the brake and the thread holding structure is weakened.

In some embodiments, the method further comprises: after the step S40, the air blowing means is controlled to blow air to blow the upper thread end which is pulled by the thread pulling rod away from the rotating shuttle.

In some embodiments, the method further comprises: after the step S40 and before the step S50 is performed, the air blowing means is controlled to blow air so as to blow the upper thread end, which is pulled by the pulling rod, away from the rotating shuttle.

In some embodiments, the step S30 specifically includes: controlling the needle to be put down, controlling the rotating shuttle to hook the upper thread and form a coil, then sleeving the bottom thread, and completing the embroidery of a stitch after drawing the upper thread; and controlling the machine needle to take down again, controlling the rotating shuttle to hook the upper thread and form a coil, sleeving the bottom thread, and drawing the upper thread to finish the embroidery of the second stitch.

In some embodiments, the method further comprises: before step S10, the bobbin thread is held by the thread holding structure.

In some embodiments, the method further comprises: after the bottom line is cut and before the needle is put down in the step S10, controlling a wire pulling rod to hook the bottom line, and then controlling a brake knife to be opened; when the binding action of the movable knife and the embroidery thread holding structure on the bottom thread is weakened, the thread pulling rod is controlled to pull the bottom thread in the direction away from the rotating shuttle until the bottom thread can be hung on the rotating shuttle support in a hanging mode, and the thread pulling rod is controlled to return.

According to a second aspect of the present disclosure, there is provided a thread cutting device of an embroidery machine, comprising a movable knife, a fixed knife, and a movable knife driving mechanism; an embroidery thread holding structure is arranged between the movable knife and the fixed knife; the thread cutting device of the embroidery machine further comprises a thread pulling rod which is arranged below the movable knife and above the rotating shuttle support, and a thread pulling driving mechanism for driving the thread pulling rod to move; the movable cutter driving mechanism drives the movable cutter to move towards the fixed cutter until the movable cutter and the fixed cutter are overlapped, and the movable cutter and the fixed cutter act to cut off the bottom line and the upper line; during the movement, after the movable cutter hooks the bottom thread and the upper thread to be cut and the thread ends of the bottom thread and the upper thread are bound between the embroidery thread holding structure and the movable cutter, the thread end part of the upper thread to be cut is stirred by the thread stirring rod to face the outer side of the rotating shuttle; the outer side of the rotating shuttle is the outer side far away from the mounting surface of the rotating shuttle shell and facing the direction of an operator.

In some embodiments, the stationary knife is provided with a through hole at the rear side of the stationary knife blade direction; the embroidery thread retaining structure comprises an embroidery thread retaining body, wherein the embroidery thread retaining body at least partially acts on the upper surface of the movable knife, and an acting part of the embroidery thread retaining body is positioned at the front side of the cutting edge direction of the movable knife; the front end of the embroidery thread holding body extends upwards to form a free end of the embroidery thread holding structure, and the free end of the embroidery thread holding structure extends into the through hole.

In some embodiments, the thread cutting device of the embroidery machine further comprises a blowing part for blowing the upper thread end, which is pulled by the thread pulling rod, away from the rotating shuttle after the upper thread end is cut.

In some embodiments, the motion track of the thread pulling rod from the origin to the pulling upper thread towards the outer side of the rotating shuttle is a linear or circular motion track of the inner side of the circular projection motion track of the driven cutter moving towards the outer side of the circular projection motion track of the driven cutter; the moving knife arc projection motion track is a motion track projected on a plane where a thread pulling rod is located by a track line of the bottom of a moving knife thread cutting end of a moving knife for hooking a facial thread around the axis of a moving knife bar.

In some embodiments, the front end of the thread pulling rod is provided with a notch, and the front end with the notch is a thread pulling action part for pulling the thread end part of the thread to be cut to the outer side of the rotating shuttle.

In some embodiments, the wire-pulling driving mechanism comprises a wire-pulling driver, a wire-pulling driving shaft and a wire-pulling linkage structure; the wire pulling driving shaft is vertically arranged and is parallel to a cutter bar of the movable cutter driving mechanism, one end of the wire pulling driving shaft is connected with the wire pulling driver, and the other end of the wire pulling driving shaft is connected with the wire pulling rod through the wire pulling linkage structure; the wire pulling linkage structure drives the wire pulling rod to do circular arc motion.

In some embodiments, the thread pulling drive mechanism includes a thread pulling driver that drives the thread pulling lever to move linearly from the rotating shuttle housing mounting face toward the operator.

Drawings

The above, as well as additional purposes, features, and advantages of embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown by way of example, and not by way of limitation.

Fig. 1 illustrates a flowchart of a thread trimming method of an embroidery machine according to an embodiment of the present disclosure.

Fig. 2 shows a top view of a thread cutting device of an embroidery machine according to one embodiment implemented under the method of fig. 1. The knife and thread retaining structure is not shown.

Fig. 3 shows a front view of the thread cutting device of the embroidery machine of fig. 2. The figure shows a knife and thread retaining structure.

Fig. 4 shows a top view of the thread cutting device of the embroidery machine of fig. 2. The figure shows a knife and thread retaining structure.

Fig. 5 shows a top view of a thread cutting device of an embroidery machine according to another embodiment implemented under the method of fig. 1. The knife and thread retaining structure is not shown.

Fig. 6 shows a top view of a thread cutting device of an embroidery machine according to another embodiment implemented under the method of fig. 1. The knife and thread retaining structure is not shown.

Like or corresponding reference characters indicate like or corresponding parts throughout the several views.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "upper," "lower," "front," "rear," and the like, as used herein, refer to a place or position relationship based on the orientation or position relationship shown in the drawings, and are merely for convenience in describing the principles of the present disclosure, and do not refer to or imply that the elements referred to must have a particular orientation, be configured or operated in a particular orientation, and thus should not be construed as limiting the present disclosure.

The conventional thread cutting device of an embroidery machine (see fig. 2, 5 and 6) includes a movable blade 1, a fixed blade 2 and a movable blade driving mechanism 3, all of which are provided on a shuttle bed 5. The movable knife 1 is mounted on a knife bar 31 of a movable knife driving mechanism 3. The movable knife 1 moves towards the fixed knife 2 in an arc mode under the drive of the movable knife driving mechanism, when the movable knife moves, the end head of the movable knife shearing line of the movable knife 1 fork out a base line and an upper line to be sheared and moves towards the fixed knife continuously until the movable knife 1 is overlapped with the fixed knife 2, and the movable knife cutting edge and the fixed knife cutting edge jointly act to shear the base line and the upper line. Referring to fig. 3 and 4, when the movable knife and the fixed knife are closed, the line-shearing action part of the movable knife is positioned below the fixed knife. The prior invention application CN202110459465.3, an embroidery thread holding structure in thread cutting device of embroidery machine, is arranged between the movable knife and the fixed knife, specifically, the embroidery thread holding structure acts on the surface of the movable knife at least partially (i.e. the acting part of the embroidery thread holding structure).

As described above, the prior invention application realizes the stable state of the binding and pressing effect of the embroidery thread and the locking of the stitch after the needle is lifted by the embroidery thread holding structure arranged between the movable knife and the fixed knife, but the length of the cut upper thread is still longer, and the risk of bringing the stitch for the second time exists.

If the thread ends are to be prevented from being brought into the rotating shuttle for the second time, the thread ends are either left short or kept away from the rotating shuttle. If the thread ends are left short, the stitch cannot be drawn tightly, a thread loop is formed, and even the thread is pulled off. If the thread ends are far away from the rotating shuttle, one way is to place the thread cutting position where the scissors are closed away from the rotating shuttle, the cut thread ends are too long and still can be brought into the rotating shuttle for the second time; the other mode utilizes the blowing component to blow away, but is influenced by the power of the blowing component and the material of the thread end, so that the thread end cannot be effectively blown away from the rotating shuttle; under the high-speed operation of the embroidery machine, the more thread ends are accumulated, the more the blowing component can not blow the thread ends off the rotating shuttle. Therefore, the problem that the stitch is bound, locked and the thread end is too long to be brought into the stitch again cannot be solved under the existing thread cutting structure at the same time.

If a new thread cutting device is designed for this problem, it is obvious that the cost and the structural suitability are great. Therefore, according to the embodiment of the present disclosure, a thread cutting method of an embroidery machine is provided, which can solve the above technical problems by adding a thread pulling rod and a thread pulling rod driving mechanism under the thread cutting device of the existing embroidery machine and matching with the thread cutting of the scissors without changing the inherent structure of the thread cutting device of the existing embroidery machine. The wire pulling rod and the wire pulling driving mechanism have simple structure, can be used under low cost and good adaptation with the inherent structure.

A thread cutting method of an embroidery machine according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. Fig. 1 illustrates a flowchart of a thread trimming method of an embroidery machine according to an embodiment of the present disclosure. The thread cutting method of the embroidery machine according to the embodiment of the present disclosure is implemented by using an embroidery machine thread cutting device provided with an embroidery thread holding structure between a movable knife and a fixed knife, and the embroidery machine thread cutting device further includes a thread pulling driving mechanism, and a thread pulling rod 6 (see fig. 2-6 for exemplary drawings) disposed below the movable knife and above the rotating shuttle support 7.

As shown in fig. 1, the method includes:

step S20, after the upper thread is brought below the needle plate, controlling the brake knife to hook the upper thread head to move towards the fixed knife until stopping at the stop limit where the movable knife and the fixed knife are not closed; at this time, the hooked upper thread is limited to the embroidery thread holding structure, and the upper thread is poked by the thread poking rod, so that the thread end part of the upper thread to be cut is poked to face the outer side of the rotating shuttle; the outer side of the rotating shuttle is an outer side which is far away from the mounting surface of the lock shell and faces the direction of an operator;

The thread cutting device of the embroidery machine adopted by the embodiment of the disclosure is an embroidery machine thread cutting device adopting an embroidery thread holding structure. The embodiment of the disclosure controls the movable knife to execute two steps, namely firstly hooking and moving the upper thread to the stop limit to bind the upper thread, and executing thread cutting action after at least one stitch embroidery is completed. In step S20, the upper thread is plucked by the plucking rod located below the movable blade, so that the thread end portion of the upper thread to be cut is plucked to face the outside of the rotating shuttle. After the binding in the step S20 and before the needle lifting in the step S30, the thread end part of the to-be-cut thread is moved away from the rotating shuttle, so that the overlong thread end is not secondarily carried into the stitch when the needle lifting in the step S30 is carried out, and the problem of secondary carried-in stitch caused by the fact that the thread end cannot be timely discharged after the thread end is cut is avoided.

In some embodiments, the thread-holding structure is a spring or a fibrous structure, or an elastic structure composed of rubber or plastic or silicone. The above structure is only an exemplary structure and is not limited to the above structure, and the thread holding structure may be selected to have a certain friction force, so as to ensure that the thread end of the upper thread can be bound before cutting the thread. The thread holding structure is also used for binding the bobbin thread, for which purpose the bobbin thread is held by the thread holding structure before step S10. In step S20, the movable knife hooks the bottom line in addition to the surface line, that is, the movable knife hooks the bottom line end to move toward the fixed knife until stopping at the stopping position where the movable knife and the fixed knife are not closed. At this time, the upper thread is stirred by the thread stirring rod, so that the thread end part of the upper thread to be cut is stirred to face the outer side of the rotating shuttle; or both the bottom thread and the upper thread are stirred by the thread stirring rod, so that the thread end part of the bottom thread to be sheared is stirred to face the outer side of the rotating shuttle. After the movable knife and the fixed knife are closed to cut off the thread ends of the bottom surface thread, the thread ends of the bottom thread are hung on the rotating shuttle support, so that the thread ends of the bottom thread are stable and cannot be brought into the rotating shuttle for the second time.

Before step S10, the method further comprises step S00: and controlling the brake knife to hook the upper thread and the bottom thread to be cut and cut the bottom thread. Specifically, the step S00 includes: step S01, controlling the needle to be in a needle position, and bringing the upper thread to the lower part of the needle plate; and S02, after the upper thread is brought below the needle plate, controlling the rotating shuttle to hook the upper thread and expand the thread loop, controlling the thread buckling device to buckle the rotating shuttle, enabling the pulled upper thread to be sleeved outside the thread buckling device and formed into a triangular coil, controlling the brake knife to hook the upper thread and the bottom thread to be cut, and closing the scissors to cut the bottom thread. After the bottom thread is cut in step S00 and before the needle is started in step S10, the bottom thread is held by the thread holding structure.

After cutting the bottom line, step S10 is performed. When the needle is started in the step S10, the cut bottom thread is not easy to pull out in the embroidery thread holding structure. To solve this problem, the method of the present disclosure further includes: after the bottom surface thread is cut in the step S00 and before the needle is started in the step S10, a thread pulling rod is controlled to hook the bottom thread, and then a brake knife is controlled to be opened; when the binding action of the movable knife and the embroidery thread holding structure on the bottom thread is weakened, the thread pulling rod is controlled to pull the bottom thread in the direction away from the rotating shuttle until the bottom thread can be hung on the rotating shuttle support in a hanging mode, and the thread pulling rod is controlled to return. In an example, step S10 is performed after the wire pulling lever returns. In another example, step S10 is performed during the return of the wire pulling lever, and the wire pulling lever completes the return action before step S20 is performed.

In the step S20, the timing of the wire pulling lever pulling the upper wire is as follows. In one embodiment, the step S20 includes: step S21, when the upper thread is brought below the needle plate, controlling the brake knife to hook the upper thread head to move towards the fixed knife until the brake knife and the fixed knife are stopped at the non-closed stop limit; and then the thread pulling rod is controlled to pull the upper thread, so that the thread end part of the upper thread to be cut is pulled to face the outer side of the rotating shuttle. In another embodiment, the step S20 includes: when the upper thread is brought below the needle plate, the brake knife is controlled to hook the upper thread end to move towards the fixed knife until the upper thread end stops at the stop limit where the movable knife and the fixed knife are not closed; during the movement, the thread pulling rod is controlled to pull the upper thread, so that the thread end part of the upper thread to be cut is pulled to face the outer side of the rotating shuttle. The former is to dial after the embroidery thread is bound by the thread holding structure, and the latter is to dial during the period of hooking the upper thread to the stop limit. The purpose of both embodiments is to dial the thread end portion of the to-be-cut thread away from the rotating shuttle before step S30.

In the step S20, the movement track of the thread pulling rod, that is, the movement track from the origin to the pulling upper thread toward the outer side of the rotating shuttle, specifically, the movement track of the inner side of the movement track of the driven knife arc projection movement toward the outer side thereof. The moving knife arc projection motion track is a motion track projected on a plane where a thread pulling rod is located by a track line of the bottom of a moving knife thread cutting end of a moving knife for hooking a facial thread around the axis of a moving knife bar. In one example (see fig. 2, 5 or 6), the moving blade wire cutting end 131 is formed by a notch 13 formed at the front end of the moving blade wire cutting action part of the moving blade 1. The notch may be a U-shaped notch or a V-shaped notch or a circular arc notch. The figure shows that the front end of the movable cutter wire cutting action part is divided into two movable cutter wire cutting ends by the notch 13, so that one movable cutter wire cutting end is used for cutting the bottom wire, and the other movable cutter wire cutting end is used for cutting the upper wire (the left side waist wire section of the triangle wire loop).

Taking fig. 2, 5 and 6 as examples, fig. 2 shows an example of a circular arc movement of the thread pulling rod, fig. 5 shows an example of a linear movement of the thread pulling rod, which is mainly an example of pushing out the thread pulling rod from the bobbin case mounting surface to the outside of the rotating shuttle, and fig. 6 shows an example of a linear movement of the thread pulling rod, which is mainly an example of pulling out the thread pulling rod from the bobbin case mounting surface to the outside of the rotating shuttle. The linear motion is not limited to the linear motion parallel to the rotating shuttle shaft direction, and also comprises oblique line motion forming a certain included angle with the rotating shuttle shaft direction.

In fig. 2, the small circular track is the moving blade arc projection movement track, and the track is not the actual moving blade movement track, and only the movement range of the wire pulling rod is described by way of example. The bottom of the movable knife thread cutting end of the movable knife for hooking the upper thread is taken as a circle center track line moving around the axis of the movable knife cutter bar, and the track line is actually constructed by taking the bottom of the movable knife thread cutting end of the movable knife for hooking the upper thread to the axis of the movable knife cutter bar as a radius and taking the axis of the movable knife shaft as the circle center, and is not an actual motion track of the movable knife, and the motion process of the movable knife is completed after the movable knife moves towards the fixed knife until the movable knife is closed, but is not a track line of the whole circumference (the actual motion track is a part of circumference). When the track line is projected on the plane of the wire pulling rod, the projected track line is the small circle track in the figure. Wherein ZK is a needle plate hole in the figure.

In the example of fig. 2, the mounting fulcrum 61 of the thread pulling lever 6 is located on the shuttle bed and on the front side of the setting blade 2. The wire pulling driving mechanism comprises a wire pulling driver, a wire pulling driving shaft 8 and a wire pulling linkage structure 9. The wire pulling driving shaft 8 is vertically arranged and parallel to the moving cutter bar, one end of the wire pulling driving shaft 8 is connected with the wire pulling driver, and the other end of the wire pulling driving shaft is connected with the wire pulling rod 6 through the wire pulling linkage structure 9. The wire pulling rod 6 is driven to rotate around the mounting pivot 61. The front end of the thread pulling rod is provided with a notch, and the front end with the notch is a thread pulling action part used for pulling the thread end part of the bottom thread and the upper thread to be cut to the outer side of the rotating shuttle. The wire pulling rod is divided into an upper wire pulling part and a lower rotating part by taking an installation fulcrum as a boundary, the lower rotating part is connected with the wire pulling linkage structure, and the wire pulling action part is arranged on the upper wire pulling part. Specifically, the large circular track is a track line of the bottom of the wire pulling rod notch rotating around the mounting fulcrum; the large circular track is not the actual movement track of the wire pulling rod, and the actual movement track of the wire pulling rod is the movement track of the driven knife which moves from the inner side to the outer side of the arc projection movement track (namely the small circular track), namely the partial circumference of the large circular track. In fig. 2, the wire pulling action part of the wire pulling rod is located at the origin position W1, and after the wire pulling, moves to the position W2 after the wire pulling. After the thread is pulled, the embroidery thread can be far away from the rotating shuttle after the thread pulling rod is pulled. The general positions W1 and W2 are shown only by way of example for illustration.

In the example of fig. 2, the thread-pulling driving shaft 8 is arranged on the right side of the rotary hook, i.e. on the opposite side of the cutter bar. The thread pulling linkage 9 comprises a first connecting rod 91 crossing the rotating shuttle, a third connecting rod 93 extending along the outer side of the rotating shuttle, and a second connecting rod 92 arranged between the first connecting rod 91 and the third connecting rod 93, wherein the second connecting rod 92 is respectively connected with the third connecting rod 93 and the first connecting rod 91 in a rotating way. The third connecting rod 93 is rotatably connected with the lower rotating part of the wire pulling rod.

In fig. 5, the circular track is the arc projected motion track of the moving blade, and the track is not the actual moving blade motion track, but is only an exemplary reference to the motion range of the wire pulling rod wire pulling. The bottom of the movable knife thread cutting end of the movable knife for hooking the upper thread is taken as a circle center track line moving around the axis of the movable knife cutter bar, and the track line is actually constructed by taking the bottom of the movable knife thread cutting end of the movable knife for hooking the upper thread to the axis of the movable knife cutter bar as a radius and taking the axis of the movable knife shaft as the circle center, and is not an actual motion track of the movable knife, and the motion process of the movable knife is completed after the movable knife moves towards the fixed knife until the movable knife is closed, but is not a track line of the whole circumference (the actual motion track is a part of circumference). When the track line is projected on the plane of the wire pulling rod, the projected track line is a circular track in the figure. Wherein ZK is a needle plate hole in the figure.

In the example of fig. 5, the movement track of the wire pulling rod 6 is a linear movement track. The front end of the thread pulling rod 6 is provided with a notch, and the front end with the notch is a thread pulling action part used for pulling the thread end part of the bottom thread and the upper thread to be cut to the outer side of the rotating shuttle. In fig. 5, the wire pulling action portion of the wire pulling lever is located at the origin position W1, and moves to the post-wire pulling position W2 after wire pulling. The origin position W1 is located inside the circular locus, and the position W2 is located outside the circular locus. After the thread is pulled, the embroidery thread can be far away from the rotating shuttle in a mode of linear pushing from inside to outside after the thread pulling rod is pulled. Preferably, the front end of the wire pulling rod is designed to be in a fork-shaped structure. The general positions W1 and W2 are shown only by way of example for illustration. The wire pulling driving mechanism comprises a wire pulling driver. The thread pulling driver drives the thread pulling rod to move from the shuttle shell installation face to the direction of an operator.

In fig. 6, the circular track is the arc projected motion track of the moving blade, and the track is not the actual moving blade motion track, but is only an exemplary reference to the motion range of the wire pulling rod wire pulling. The bottom of the movable knife thread cutting end of the movable knife for hooking the upper thread is taken as a circle center track line moving around the axis of the movable knife cutter bar, and the track line is actually constructed by taking the bottom of the movable knife thread cutting end of the movable knife for hooking the upper thread to the axis of the movable knife cutter bar as a radius and taking the axis of the movable knife shaft as the circle center, and is not an actual motion track of the movable knife, and the motion process of the movable knife is completed after the movable knife moves towards the fixed knife until the movable knife is closed, but is not a track line of the whole circumference (the actual motion track is a part of circumference). When the track line is projected on the plane of the wire pulling rod, the projected track line is a circular track in the figure. Wherein ZK is a needle plate hole in the figure.

In the example of fig. 6, the movement track of the wire pulling rod 6 is a linear movement track. The front end of the thread pulling rod 6 is provided with a notch, and the front end with the notch is a thread pulling action part used for pulling the thread end part of the bottom thread and the upper thread to be cut to the outer side of the rotating shuttle. In fig. 6, the wire pulling action portion of the wire pulling lever is located at the origin position W1, and moves to the post-wire pulling position W2 after wire pulling. The origin position W1 is located inside the circular locus, and the position W2 is located outside the circular locus. After the thread is pulled, the embroidery thread can be far away from the rotating shuttle in a mode of being pulled linearly from inside to outside after the thread pulling rod is pulled. Preferably, the front end of the wire pulling rod is designed to be in a hook-shaped structure. The general positions W1 and W2 are shown only by way of example for illustration. The wire pulling driving mechanism comprises a wire pulling driver. The thread pulling driver drives the thread pulling rod to move from the shuttle shell installation face to the direction of an operator.

Fig. 2, 5 and 6 show three examples, respectively, and the present disclosure is not limited to the three examples, and the specific wire pulling lever structure may have various forms, and the wire pulling lever driving mechanism for driving the wire pulling lever may also have various arrangements. The mounting positions of the wire pulling rod and the wire pulling rod driving mechanism can be set on the basis of not interfering with the existing structure, and are not limited to the positions shown in the figure. Wherein the thread pulling rod is arranged below the moving knife and above the rotating shuttle support, see in particular fig. 3 (the thread pulling rod in the example of fig. 5 and 6 is also arranged between the moving knife and the rotating shuttle support as in fig. 3).

In the above example (see fig. 3, 4), the thread holding structure 4 may be the structure of the prior patent application. The embroidery thread holding structure 4 comprises an embroidery thread holding body, wherein the embroidery thread holding body at least partially acts on the upper surface of the movable knife, and an acting part of the embroidery thread holding body is positioned at the front side of the cutting edge direction of the cutting edge of the movable knife. The front end of the embroidery thread holding body extends upwards to form a free end of the embroidery thread holding structure, and the free end 42 of the embroidery thread holding structure extends into the through hole 21. The embroidery thread holding structure is used for binding the bottom thread and/or the upper thread end between the acting part of the embroidery thread holding body and the movable knife 1 before thread cutting. In the example shown in the figure, the rear end of the thread-holding body is fixed above the fixed knife 2, and the thread-holding body passes through the through hole 21 from above the fixed knife 2 and then acts on the upper surface of the movable knife 1. The rear end of the thread holding body may be fixed above the fixed cutter 2 by bolts, for example, fixed to the upper surface of the fixed cutter 2 (see fig. 1 and 4), for example, fixed to a mounting base of the fixed cutter 2, for example, fixed to the shuttle bed 5.

The stationary knife in the above example may be, but not limited to, the stationary knife structure in the foregoing prior application, but may be other stationary knife structures of the existing wire cutting device. For example, a stationary blade edge is provided at the bottom of the stationary blade toward the stationary blade shearing line action portion of the movable blade. In one embodiment, the front end of the fixed cutter shearing action part is flush with the front end of the fixed cutter blade. In another embodiment, the front end of the fixed blade line shearing action part is provided with an extension part extending towards the moving blade direction, so that the fixed blade edge is retracted in the extension part.

The moving blade in the above example may be, but not limited to, the moving blade structure in the foregoing prior application, and may be other moving blade structures of the existing wire cutting device. For example, the moving knife is provided with a downward inclined surface towards the moving knife line shearing action part of the fixed knife, and the inclined surface is provided with a groove. The groove is provided with a concave hole or a through hole at the bottom of the end of the other side of the groove far away from the movable knife cutting wire end, the hole wall of the concave hole and the inclined surface form a movable knife blade, or the hole wall of the through hole and the inclined surface form a movable knife blade. Preferably, the through hole or concave hole is an inclined hole so as to enable the movable cutter blade to be sharper. The acting part of the embroidery thread holding body acts on the bottom surface of the groove of the movable knife, specifically, the acting part of the embroidery thread holding body acts on the bottom surface of the groove at the rear side of the notch and at the front side of the cutting edge of the movable knife.

The moving knife driving mechanism in the above example can adopt the existing moving knife driving mechanism, which comprises a knife bar, a swing arm and a rotating shaft connecting rod. The cutter bar is vertically arranged on the shuttle race, the lower end of the cutter bar is connected with the rotating shaft connecting rod, the upper end of the cutter bar is connected with one end of the swing arm, the other end of the swing arm is provided with a driving piece, and when the cutter bar drives the swing arm to swing, the driving piece drives the movable cutter to move. The driving member may be a pin, ball, bearing, pin or the like.

The stitch embroidery process in step S30 is to complete the locking of the upper thread, thereby ensuring that the embroidery thread is cut after being drawn. In one embodiment, step S30 includes: and (3) controlling the machine needle to take down, controlling the rotating shuttle to hook the upper thread and form a coil, sleeving the bottom thread, and drawing the upper thread to finish embroidery of a stitch. In another embodiment, the step S30 includes: controlling the needle to be put down, controlling the rotating shuttle to hook the upper thread and form a coil, then sleeving the bottom thread, and completing the embroidery of a stitch after drawing the upper thread; and controlling the machine needle to take down again, controlling the rotating shuttle to hook the upper thread and form a coil, sleeving the bottom thread, and drawing the upper thread to finish the embroidery of the second stitch. After one stitch embroidery is completed, the embroidery thread can be drawn tightly, and then the thread ends are cut. To ensure that the upper thread effectively covers the lower thread, it is preferable to complete two stitch embroidery. The present disclosure is not limited to embroidery of one stitch or two stitches, and may also complete embroidery of a plurality of stitches as needed to solve the above-described technical problems.

Further, the method of the present disclosure further includes a step S50 of setting the wire pulling lever. In one embodiment, the step S50 is to control the brake knife to open, control the thread pulling rod to move a certain distance to the outside of the rotating shuttle after the binding action of the movable knife to the thread end of the upper thread is weakened, and return before the movable knife moves to the fixed knife to execute the next closing thread cutting of the scissors. In another embodiment, step S50 is specifically: and controlling the brake knife to be opened, and controlling the thread pulling rod to return before the brake knife moves towards the fixed knife to execute the next closing thread cutting of the scissors after the binding effect of the brake knife on the thread end of the upper thread is weakened between the brake knife and the thread embroidering holding structure. The former embodiment continues to open outwardly until return, to a maximum distance, and then returns. The latter embodiment returns from the wire pulling end position after the wire pulling action is completed. The upper thread end can be discharged further better, and the maximum distance of the upper thread end can be determined by setting the rotation angle of the thread pulling rod according to requirements. The return of the two embodiments is to return to the original position, and quick return is needed, and the return is needed before the scissors are closed.

In order to further improve the thread end discharging efficiency, the thread cutting device of the embroidery machine may be provided with a blowing component, such as a blowing nozzle, which is aligned with the thread pulling action part of the thread pulling rod, so as to blow the upper thread end and/or the lower thread end pulled by the thread pulling rod away from the scissors and away from the rotating shuttle. To this end, the method of the present disclosure further comprises a blowing step. In one embodiment, the method of the present disclosure further comprises: after the step S40, the air blowing means is controlled to blow air to blow the upper thread end which is pulled by the thread pulling rod away from the rotating shuttle. In another embodiment, after the step S40 and before the step S50 is performed with scissors closed, the air blowing means is controlled to blow the upper thread end, which is pushed by the thread pulling lever, away from the rotating hook.

While several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. The thread cutting method of the embroidery machine is realized by adopting a thread cutting device of the embroidery machine, which is provided with a thread holding structure between a movable knife and a fixed knife, and the thread cutting device of the embroidery machine is applied to a control end of the embroidery machine and is characterized by also comprising a thread pulling rod which is arranged below the movable knife and above a rotating shuttle support and a thread pulling driving mechanism for driving the thread pulling rod to move; the method comprises the following steps:

2. The thread trimming method of an embroidery machine according to claim 1, wherein the movement track of the thread pulling lever from the origin to the outside of the rotating shuttle is a movement track of the driven knife circular arc projection movement track moving from the inside to the outside thereof; the moving knife arc projection motion track is a motion track projected on a plane where a thread pulling rod is located by a track line of the bottom of a moving knife thread cutting end of a moving knife for hooking a facial thread around the axis of a moving knife bar.

3. The thread trimming method of an embroidering machine according to claim 2, wherein the thread pulling driving mechanism drives the thread pulling lever to move linearly or to move in a circular arc to pull the thread end portion of the thread to be cut toward the outside of the rotating shuttle.

4. The thread cutting method of an embroidery machine according to claim 1, wherein the thread holding structure is a spring sheet or a fibrous structure, or an elastic structure composed of rubber or plastic or silica gel.

5. The thread trimming method of an embroidery machine according to claim 1, wherein said step S20 comprises:

6. The thread trimming method of an embroidery machine according to claim 1, wherein said step S20 comprises: when the upper thread is brought below the needle plate, the brake knife is controlled to hook the upper thread end to move towards the fixed knife until the upper thread end stops at the stop limit where the movable knife and the fixed knife are not closed; during the movement, the thread pulling rod is controlled to pull the upper thread, so that the thread end part of the upper thread to be cut is pulled to face the outer side of the rotating shuttle.

7. The thread trimming method of an embroidery machine according to claim 1, further comprising the step of controlling the brake blade to be opened, controlling the thread pulling lever to continue moving a certain distance to the outside of the rotating shuttle after the binding effect of the movable blade and the thread-holding structure on the thread end of the upper thread is weakened, and returning before the movable blade moves to the fixed blade to perform the next closing thread trimming of the scissors; or alternatively, the process may be performed,

the method further comprises the step S50 of controlling the brake knife to be opened, and controlling the thread pulling rod to return before the brake knife moves towards the fixed knife to execute the next closing thread cutting of the scissors after the binding action of the brake knife on the upper thread end between the brake knife and the thread embroidering holding structure is weakened.

8. The thread trimming method of an embroidery machine according to claim 1, wherein the method further comprises: after the step S40, the air blowing means is controlled to blow air to blow the upper thread end which is pulled by the thread pulling rod away from the rotating shuttle.

9. The thread trimming method of an embroidery machine of claim 7, further comprising: after the step S40 and before the step S50 is performed, the air blowing means is controlled to blow air so as to blow the upper thread end, which is pulled by the pulling rod, away from the rotating shuttle.

10. The thread trimming method of an embroidery machine according to claim 1, wherein the method further comprises: before step S10, the bobbin thread is held by the thread holding structure.

11. The thread trimming method of an embroidery machine according to claim 1, wherein the method further comprises: after the bottom line is cut and before the needle is put down in the step S10, controlling a wire pulling rod to hook the bottom line, and then controlling a brake knife to be opened; when the binding action of the movable knife and the embroidery thread holding structure on the bottom thread is weakened, the thread pulling rod is controlled to pull the bottom thread in the direction away from the rotating shuttle until the bottom thread can be hung on the rotating shuttle support in a hanging mode, and the thread pulling rod is controlled to return.