CN115710783B - Thread cutting method of embroidery machine - Google Patents
Thread cutting method of embroidery machine Download PDFInfo
- Publication number
- CN115710783B CN115710783B CN202211705592.8A CN202211705592A CN115710783B CN 115710783 B CN115710783 B CN 115710783B CN 202211705592 A CN202211705592 A CN 202211705592A CN 115710783 B CN115710783 B CN 115710783B
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- thread
- needle
- embroidery
- knife
- movable
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- 238000005520 cutting process Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000009966 trimming Methods 0.000 claims description 12
- 238000005452 bending Methods 0.000 description 8
- 239000002699 waste material Substances 0.000 description 8
- 239000004744 fabric Substances 0.000 description 7
- 238000010008 shearing Methods 0.000 description 6
- 241001391944 Commicarpus scandens Species 0.000 description 5
- 238000009956 embroidering Methods 0.000 description 3
- 210000004209 hair Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05C—EMBROIDERING; TUFTING
- D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
- D05C11/20—Arrangements for cutting the needle or lower threads
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
A thread cutting method of an embroidery machine belongs to the technical field of embroidery machines. The method is applied to the thread cutting device of the embroidery machine, which is provided with the thread holding structure between the movable knife and the fixed knife, and 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 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; 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. The utility model avoids the upper thread end from being brought into the rotating shuttle to form a new stitch, thereby influencing the quality of embroidery.
Description
The present application is a divisional application of patent application CN202110459465.3 of the "an embroidery machine thread cutting device and an embroidery machine thread cutting method" proposed by 2021, 4 and 27.
Technical Field
The utility model relates to the technical field of embroidery machines, in particular to a thread cutting method of an embroidery machine.
Background
At present, for the embroidery machine industry, when embroidery finishes one graphic unit and starts to embroider another graphic unit, thread cutting treatment is needed to be carried out on upper threads and bottom threads below the cloth cover, and as the number of embroidery units is large, frequent thread cutting is needed, thread ends left after thread cutting and needle lifting are located below the cloth cover. After the thread is cut by the general embroidery machine, an upper thread driven by the needle of the needle lifting embroidery machine passes through the cloth cover and is hooked by the rotating shuttle and separated into front and rear two threads, and the front and rear two threads form a coil which wraps the bottom thread in the rotating shuttle through the rotating shuttle. In the process of forming the coil and the loop, the thread ends of the upper thread are not bound, so that the condition that the embroidery thread cannot be tightly drawn easily occurs, the thread ends below the cloth cover are disordered at the moment, the thread ends are different in length, and the quality of embroidery products is greatly influenced; and the loose stitch easily causes the bottom line to break loose, and the phenomenon of thread break and thread break easily occurs.
The utility model patent CN201071451Y discloses a thread cutting device of an embroidery machine, and particularly discloses a thread catching device which consists of a movable cutter, a fixed cutter and a movable cutter driving mechanism for controlling the movement of the movable cutter, wherein the movable cutter and the fixed cutter are arranged in a movable cutter assembly which is also arranged on a needle plate, the movable cutter can be overlapped with the fixed cutter under the control of the movable cutter driving mechanism, and the needle plate is also provided with a thread catching device for pressing a bottom thread in the thread hooking and cutting process of the movable cutter. The patent only presses the bottom thread head in the thread cutting process, but does not bind the upper thread head of the needle embroidery after thread cutting, and the problems that the thread head is disordered and different in length and easy to break loose from the bottom thread caused by incapability of tightening the embroidery thread still exist.
Applicant's prior utility model application CN 2021101748749 discloses a thread cutting method for an embroidery machine, and specifically discloses a method comprising: step S10, controlling the needle to be in a needle position, and bringing the upper thread end to the lower part of the needle plate; step S20, after the thread ends are brought below the needle plate, controlling the thread cutting moving knife to hook the thread ends to move towards the thread cutting fixed knife until stopping at the stop limit when 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; step S30, controlling the needle to be needled down to finish embroidery of at least one stitch; and S40, controlling the thread cutting moving knife to move from the stop limit to the thread cutting fixed knife, and cutting thread ends of the thread when the thread cutting moving knife and the thread cutting fixed knife are closed. The utility model utilizes the bottom thread retainer positioned below the thread cutting moving knife on the existing embroidery machine to bind the upper thread ends before thread cutting, and cuts threads under the condition that both the bottom thread and the upper thread are retained by the bottom thread retainer, thereby solving the problems that the thread ends are different in length and the bottom thread is easy to break loose due to too loose stitch to a certain extent. In the practical application process, because the bottom thread retainer is located below the thread cutting moving knife, the upper thread is located between the bottom thread retainer and the thread cutting moving knife, after shearing, the upper thread end is easy to bend 180 degrees and then faces the rotating shuttle direction, so that when the second needle is started, a new thread end is formed on the thread loop in a sleeved mode, and the quality of embroidery is affected. In addition, after trimming is completed, waste remains on the bobbin thread holder.
Disclosure of Invention
Aiming at the problems existing in the prior art, the utility model provides a thread cutting method of an embroidery machine, which avoids the disorder and different length of thread ends below a cloth cover, solves the problem that the loose thread is easy to cause the break-off of a bottom thread to cause thread breakage, and can also avoid the phenomenon that the thread ends of upper threads are brought into a rotating shuttle to form new thread marks, thereby influencing the quality of embroidery products.
The utility model is realized by the following technical scheme:
the thread cutting device of the embroidery machine comprises a movable cutter, a fixed cutter and a movable cutter driving mechanism which are all arranged on a shuttle bed; the movable knife is arranged on a knife bar of the movable knife driving mechanism; the fixed cutter is provided with a through hole at the rear side of the fixed cutter in the cutting edge direction of the fixed cutter cutting edge; an embroidery thread retaining structure is arranged between the movable cutter and the fixed cutter, the elastic piece embroidery thread retaining structure comprises an embroidery thread retaining body, the embroidery thread retaining body at least partially acts on the upper surface of the movable cutter, and an acting part of the embroidery thread retaining body is positioned at the front side of the cutting edge direction of the cutting edge of the movable cutter; the front end of the embroidery thread holding body extends upwards to form a free end of an embroidery thread holding structure, and the free end of the embroidery thread holding structure extends into the through hole; 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 cutter before thread cutting; 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 utility model can effectively bind the bottom thread and/or the upper thread end (namely binding both the upper thread and the upper thread when the needle is started and binding the bottom thread after the upper thread is cut) by utilizing the embroidery thread retaining structure arranged between the fixed knife and the movable knife, thereby avoiding the messy thread ends and the uneven thread end length below the cloth cover and solving the problem that the bottom thread is easy to break loose and take off due to too loose stitch.
Compared with the prior application CN 2021101748749, which adopts the scheme that the bottom thread retainer below the movable knife is used for binding the bottom thread, the prior application can bind the bottom thread head, but the bottom thread retainer is located below the movable knife, so that the upper thread head bends 180 degrees and faces the rotating shuttle, and when the second needle is started, a stitch is carried on, a new thread head is formed, and the quality of embroidery is greatly affected. The scheme does not adopt a bottom thread retainer to bind the bottom thread, but adopts an embroidery thread retaining structure which is arranged above the movable cutter, so that the upper thread head is prevented from being bent 180 degrees, the upper thread head is always kept away from the direction of the rotating shuttle, and the thread head is prevented from being sleeved into the thread ring to form a new stitch. Meanwhile, the embroidery thread retaining structure can effectively bind thread ends on the bottom surface.
After trimming, waste materials are generated. The bobbin thread holder in the prior application is positioned below the movable knife, and when the movable knife is opened for the second time, the waste material remains on the bobbin thread holder and is not easy to clean. By adopting the embroidery thread retaining structure arranged between the fixed knife and the movable knife, the waste is easy to be discharged rapidly after the movable knife is opened for the second time.
In addition, the utility model can also avoid the base thread from being cut off accidentally when the movable knife hooks the base thread. Before cutting, one end of the bottom thread is fixed at the fabric, and the other end is connected in the shuttle core of the rotating shuttle; in the process of hooking the bobbin thread by the movable cutter, the bobbin thread at the shuttle core is actually pulled out and then sheared. When the bobbin thread holder in the prior application is adopted, the bobbin thread between the movable cutter hooking position and the bobbin thread is pressed by the bobbin thread holder, which is equivalent to the section of the bobbin thread being subjected to more pressure, and the movable cutter is easily cut off in advance when passing the cutting edge of the stationary cutter when continuing to move toward the stationary cutter. When the embroidery thread retaining structure is adopted, the bottom thread between the needle plate and the embroidery thread retaining structure is relatively motionless, the bottom thread is not subjected to more pressure in the process of hooking the bottom thread by the movable cutter, the bottom thread can be cut when the movable cutter cutting edge and the fixed cutter cutting edge coincide, and the bottom thread cannot be cut in advance in the hooking process.
Preferably, the embroidery thread holding structure is a spring sheet or a fibrous structure.
Preferably, the rear end of the thread holding body is fixed above the fixed knife, and the thread holding body passes through the through hole from above the fixed knife and then acts on the upper surface of the movable knife.
Preferably, the rear end of the thread holding body is fixed on the upper surface of the fixed knife or on the shuttle bed.
Preferably, the rear end of the thread holding body is fixed below the stationary knife.
Preferably, the rear end of the thread holding body is fixed on the lower surface of the fixed knife or on the shuttle bed.
Preferably, the through hole is replaced by a blind hole, the blind hole is formed in the lower surface of the fixed cutter, and the free end of the embroidery thread holding structure extends into the blind hole; or the fixed knife provided with the through hole is replaced by the fixed knife without the through hole, and the free end of the embroidery thread holding structure is positioned between the fixed knife and the movable knife.
Preferably, a moving knife line cutting action part of the moving knife facing the fixed knife is provided with a downward inclined surface, the inclined surface is provided with a groove, the front end of the moving knife line cutting action part is provided with a notch for forming a moving knife line cutting end, the groove is provided with a concave hole or a through hole at the bottom of the groove at the end of the other side of the groove far away from the moving knife line cutting end, the hole wall of the concave hole and the inclined surface form a moving knife blade, or the hole wall of the through hole and the inclined surface form a moving knife blade; the bottom of the fixed knife, which faces the fixed knife shearing line action part of the movable knife, is provided with a fixed knife edge.
Preferably, the acting portion of the thread holding body acts on the bottom surface of the groove of the movable knife.
The thread cutting method of the embroidery machine is applied to 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 the method is applied to a control end of the embroidery machine and comprises the following steps:
step S10, controlling the needle to be in a needle position, and bringing the upper thread end to the lower part of the needle plate;
step S20, after the thread ends are brought below the needle plate, controlling the brake knife to hook the thread ends 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;
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.
The thread trimming device of the embroidery machine is based on the thread trimming device, the thread holding structure is used for binding the upper thread when the embroidery machine is used for lifting the needle, the drawn upper thread heads are formed conveniently after thread trimming, the lengths of the upper thread heads are uniform, the embroidery thread is drawn, and the upper thread heads are not easy to break loose from the bottom thread.
Preferably, step S10 further includes: before the needle passes through the needle plate hole, the movable knife is controlled to be opened, so that the upper thread can pass through the needle plate hole and pass through the space between the fixed knife and the movable knife, and then is hooked by the rotating shuttle.
Preferably, step S10 further includes: after the thread end of the upper thread is brought below the needle plate and before the next needle passes through the needle plate hole, the movable cutter is controlled to be opened, so that the upper thread can pass through the space between the fixed cutter and the movable cutter and can be hooked by the movable cutter.
Preferably, the method further comprises: before the needle is controlled to pass through the needle plate hole in the step S10, the upper thread clamp is controlled to clamp the upper thread, and then the step S10 is executed; after step S20 and before the needle is controlled to pass through the needle hole at step S30, the needle thread holder is controlled to be opened to release the needle thread, and then step S30 is performed.
Preferably, the method further comprises: before the needle is controlled to pass through the needle plate hole in step S10, the needle thread holder is controlled to open to release the needle thread.
Preferably, the method further comprises: before the needle is controlled to pass through the needle plate hole in the needle lower needle in the step S10, the upper thread clamp is controlled to be opened so as to loosen the upper thread; before bringing the needle thread end under the needle plate and the needle starts to move back from the lowest position to control the needle to pass through the needle plate hole in step S30, controlling the needle thread clamp to clamp the needle thread; the upper thread clamp is controlled to be opened before the needle is driven through the needle plate hole at step S30 to loosen the upper thread, and then step S30 is performed.
Preferably, 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.
Preferably, the method further comprises, prior to step S10, presetting a distance by which the movable knife moves from the initial open position to the stop limit.
Preferably, the method further comprises, prior to step S10, holding the bobbin thread with an embroidery thread holding structure.
Preferably, the embroidery thread holding structure is a spring sheet or a fibrous structure.
The utility model has the following beneficial effects:
the thread cutting method of the embroidery machine can prevent the thread ends of the upper thread from being brought into the rotating shuttle to form new threads, so that the quality of embroidery products is affected, the upper thread and the lower thread are kept by utilizing the thread holding structure before thread cutting, the thread is cut under the condition of tightening, and the problems of broken thread and thread off caused by loose thread and loose lower thread are avoided; meanwhile, the cut upper thread ends are consistent in length, the thread ends are free of hairs, and the quality of embroidery is improved. The utility model can also avoid the residue of waste after shearing and can avoid the accidental cutting of the bottom line when the movable knife hooks the bottom line.
Drawings
FIG. 1 is a perspective view (mounted on an embroidery machine head) of an embodiment of a thread cutting apparatus of an embroidery machine employing a thread cutting method of an embroidery machine according to the present utility model;
FIG. 2 is a perspective view of the thread-holding structure of FIG. 1;
FIG. 3 is a schematic view of the stationary knife of FIG. 1;
FIG. 4 is a schematic view of the thread retaining structure of FIG. 2 in cooperation between a stationary knife and a movable knife;
FIG. 5 is a perspective view (mounted on the head of the embroidery machine) of another embodiment of the thread cutting device of the embroidery machine employing the thread cutting method of the present utility model;
FIG. 6 is a perspective view of the thread-holding structure of FIG. 5;
FIG. 7 is a schematic view of the engagement between the thread retaining structure of FIG. 6 and a movable knife;
FIG. 8 is a schematic view of the structure of a movable knife in a thread cutting device of an embroidery machine according to the thread cutting method of the present utility model;
fig. 9 is a flowchart of a thread cutting method of an embroidery machine according to the present utility model. .
Detailed Description
The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.
The utility model relates to a thread cutting device (see fig. 1 and 5) of an embroidery machine, which comprises a movable cutter 1, a fixed cutter 2 and a movable cutter driving mechanism 3 which are all arranged on a shuttle bed 5. The movable knife 1 is mounted on a knife bar 31 of a movable knife driving mechanism. The stationary blade 2 is provided with a through hole 21 at the rear side of the stationary blade edge 22 in the cutting edge direction. An embroidery thread retaining structure 4 is disposed between the movable blade 1 and the stationary blade 2, the embroidery thread retaining structure 4 includes an embroidery thread retaining body 41, the embroidery thread retaining body acts at least partially on the upper surface of the movable blade, and an acting portion of the embroidery thread retaining body is located at the front side of the movable blade edge direction (refer to fig. 4 and 7). 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. The movable cutter driving mechanism drives the movable cutter 1 to move towards the fixed cutter 2, and when the movable cutter moves, the end head of the movable cutter shearing line of the movable cutter 1 fork out a bottom line and an upper line to be sheared and continues to move towards the fixed cutter 2 until the movable cutter 1 is overlapped with the fixed cutter 2, the movable cutter cutting edge and the fixed cutter cutting edge jointly act to shear the bottom line and the upper line.
The embroidery thread retaining structure can be an elastic piece or a fibrous structure, such as felt and hairbrush, and can have certain friction force to ensure that thread ends on the bottom surface can be bound before thread cutting.
Fig. 1 to 4 show an embodiment of a thread cutting device for an embroidery machine according to the present utility model. The rear end of the thread holding body 41 is fixed above the fixed knife 2, and the thread holding body 41 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.
In fig. 2, the thread holding body of the thread holding structure includes a mounting portion 411, a connecting portion 412, and an acting portion 413. The mounting portion has a mounting hole. The connection part 412 connects the mounting part 411 and the acting part 413, and the connection part 412 extends downward from the mounting part 411, passes through, and is connected to the acting part 413. In the drawing, the action part is a bending structure, and the bending surface of the action part acts on the surface of the movable knife. The utility model is not limited to the structure that the embroidery thread holding body acts on the surface of the movable knife being a bending structure, but is not limited to the structure that the bending surface acts on the surface of the movable knife. The action surface of the action part can also be a plane or an inclined plane so that the thread end of the bottom surface can be restrained in the space between the thread holding structure and the movable knife. The front end of the active portion extends upward to form a free end 42 of the thread-holding structure, which can extend into the through hole 21.
As shown in fig. 3, the stationary knife is provided with a through hole 21 at a position between the stationary knife blade and the stationary knife mounting hole. In order to enable the thread-holding structure to pass through, the through hole 21 is opened according to the thread-holding structure size.
Fig. 5-7 illustrate another embodiment of a thread cutting device for an embroidery machine according to the present utility model. The rear end of the thread holding body 41 is fixed below the stationary knife 2. The rear end of the thread holding body may be fixed under the fixed knife 2 by bolts, for example, fixed on the lower surface of the fixed knife 2, for example, fixed on a mounting base of the fixed knife 2 (see fig. 7), for example, fixed on the shuttle bed 5.
In fig. 6, the thread holding body of the thread holding structure includes a mounting portion 411, a connecting portion 412, and an acting portion 413. The mounting portion 411 has a mounting hole. The connection part 412 connects the mounting part 411 and the acting part 413, and the connection part 412 extends downward from the mounting part 411, passes through, and is connected to the acting part 413. In the drawing, the action part is a bending structure, and the bending surface of the action part acts on the surface of the movable knife. The utility model is not limited to the structure that the embroidery thread holding body acts on the surface of the movable knife being a bending structure, but is not limited to the structure that the bending surface acts on the surface of the movable knife. The action surface of the action part can also be a plane or an inclined plane so that the thread end of the bottom surface can be restrained in the space between the thread holding structure and the movable knife. The front end of the active portion extends upward to form a free end 42 of the thread-holding structure, which can extend into the through hole 21.
As shown in fig. 5, the stationary blade 2 is provided with a through hole 21 at a position between the stationary blade edge 22 and the stationary blade mounting hole. In order to enable the thread-holding structure to pass through, the through hole 21 is opened according to the thread-holding structure size.
The embodiments shown in fig. 5-7 are not limited to the use of through holes. The embroidery thread holding structure is arranged below the fixed knife, and the through hole can be changed into a blind hole, namely, a hole with a certain depth is formed, and the free end is allowed to extend into the hole. Or, on the premise that the thread can be cut normally between the fixed cutter and the movable cutter, a certain space is ensured to accommodate the embroidery thread holding structure to realize the binding of the thread end on the bottom surface before the thread cutting, and the fixed cutter is not provided with a through hole or a blind hole.
The two embodiments adopt fixed cutters with the same structure (the difference between the two embodiments is that whether the fixed cutters are provided with through holes or the sizes of the through holes), and movable cutters.
As shown in fig. 3 and 5, the stationary blade 2 is provided with a stationary blade edge 22 at the bottom of a stationary blade shearing action part facing the movable blade 1. The fixed knife blade raw material is welded at the bottom of the fixed knife, and the fixed knife blade is obtained after grinding. In one embodiment, the front end of the stationary blade wire cutting action portion is flush with the front end of the stationary blade edge 22. In another embodiment, the front end of the fixed blade wire cutting action part is provided with an extension part extending towards the moving blade 1, so that the fixed blade edge 22 is retracted in the extension part. In the former embodiment, when the movable knife blade intersects with the stationary knife blade, the embroidery thread is cut off in advance or the embroidery thread is cut once the embroidery thread is stretched at the stationary knife thread-cutting action portion and the stationary knife blade. In the latter embodiment, the extension portion blocks the advancing contact of the embroidery thread with the fixed cutter blade, so that the embroidery thread is not tensioned in advance at the fixed cutter blade to cut hair or cut embroidery thread. Meanwhile, in the latter embodiment, the extension part is not suitable to be too long, the too long extension part can be contacted with the moving knife blade first, and tension exists between the extension part and the moving knife blade in the moving process of the moving knife towards the fixed knife, so that the moving knife blade finally cuts off the embroidery thread in advance. 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. In addition, the front end of the fixed cutter thread cutting action part can be a plane or a concave surface, and embroidery threads can be conveniently gathered at the cutting edge when the front end of the fixed cutter thread cutting action part with the concave surface is adopted.
Fig. 8 shows a structure of a movable cutter of the thread cutting device of the embroidering machine of the present utility model. The movable knife 1 is provided with a downward inclined surface 11 towards the movable knife shearing action part of the fixed knife 2, and the inclined surface is provided with a groove 12. Thus, when the movable knife moves towards the fixed knife, the bottom thread and the upper thread of the thread to be cut are converged in the groove, and the groove is provided with a space for the embroidery thread, so that the embroidery thread is provided with an extension space in the groove and cannot be stretched, and the thread is prevented from being cut in advance after the movable knife contacts with the fixed knife; in addition, the inclined surface is arranged, so that the cutting edge of the fixed knife can be prevented from being directly rubbed against the embroidery thread to be broken. In order to control the cutting of the bottom line and the length of the upper line to be consistent, the length should not be too long or too short, so that the embroidery thread needs to be cut off in advance when the fixed knife blade and the movable knife blade intersect, but not in the process of moving the movable knife blade towards the fixed knife blade (i.e. when the movable knife blade does not intersect), and the structural design is needed.
The front end of the movable knife thread cutting action part is provided with a notch 13 for forming a movable knife thread cutting end 131, and the notch can be a U-shaped notch, a V-shaped notch or a circular arc-shaped 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).
The groove 12 is provided with a concave hole 14 or a through hole 14 at the bottom of the other end of the groove far away from the movable knife wire cutting end 131, the hole wall of the concave hole 14 and the inclined surface 11 form a movable knife blade, or the hole wall of the through hole 14 and the inclined surface 11 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 portion of the thread holding body acts on the groove bottom surface of the movable blade (see fig. 4, 7), specifically, the acting portion of the thread holding body acts on the groove bottom surface of the rear side of the recess and the front side of the movable blade edge.
The movable knife driving mechanism adopts the existing movable knife driving mechanism and comprises a knife bar, a swing arm and a rotating shaft connecting rod. The cutter bar is vertically arranged on the shuttle race 5, 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 present utility model is not described in detail herein, particularly with reference to the applicant's prior application.
As shown in fig. 9, the utility model also provides a thread cutting method of the embroidery machine, which is realized by adopting the thread cutting device of the embroidery machine. The method is applied to the control end of the embroidery machine and comprises the following steps:
step S10, controlling the needle to be in a needle position, and bringing the upper thread end to the lower part of the needle plate;
step S20, after the thread ends are brought below the needle plate, controlling the brake knife to hook the thread ends 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;
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.
The method of the utility model does not use the existing bobbin thread holder any more, namely, the bobbin thread holder structure on the existing thread cutting device of the embroidery machine is canceled, and the thread cutting device of the embroidery machine with the thread holding structure is adopted. The method controls the brake knife to execute two steps, namely firstly hooking the upper thread and moving the upper thread to the stop limit to bind the upper thread, and then executing thread cutting action after at least one stitch embroidery is completed.
The method of the present utility model further comprises the step of opening the moving blade beyond the location of the needle plate aperture. In an embodiment, step S10 further includes: before the needle passes through the needle plate hole, the movable knife is controlled to be opened, so that the upper thread can pass through the needle plate hole and pass through the space between the fixed knife and the movable knife, and then enter the rotating shuttle. In another embodiment, step S10 further includes: after the thread end of the upper thread is brought below the needle plate and before the next needle passes through the needle plate hole, the movable cutter is controlled to be opened, so that the upper thread can pass through the space between the fixed cutter and the movable cutter and can be hooked by the movable cutter. The former is carried out before the operation of bringing the needle thread end under the needle plate is carried out, and the latter is carried out after the needle thread end is brought under the needle plate and before the operation of controlling the movable knife to hook the needle thread end to stop limit is carried out. The opening degree of the movable knife in the two embodiments is to ensure that the distance between the movable knife for cutting the thread and the fixed knife for cutting the thread is large enough so as not to interfere with operations such as needle setting. When the existing thread cutting device adopts two movable cutters, the opening degree between the two movable cutters is controlled, so that the two movable cutters are simultaneously controlled to be opened, or one movable cutter is controlled to be used as a thread cutting fixed cutter to be kept still, and the other movable cutter is controlled to be opened.
The method of the present utility model further includes facial line clamping control. The method is performed in dependence of an upper thread clamp on an embroidery machine. The upper thread clamp is an upper thread clamp on the existing embroidery machine. The utility model ensures that the upper thread can be restrained advantageously through the upper thread clamping cooperation control, and is not easy to break during the restraint. In one embodiment, the method of the present utility model further comprises: before the needle is controlled to pass through the needle plate hole in the step S10, the upper thread clamp is controlled to clamp the upper thread, and then the step S10 is executed; after step S20 and before the needle is controlled to pass through the needle hole at step S30, the needle thread holder is controlled to be opened to release the needle thread, and then step S30 is performed. In another embodiment, the method of the present utility model further comprises: before the needle is controlled to pass through the needle plate hole in step S10, the needle thread holder is controlled to open to release the needle thread. In another embodiment, the method of the present utility model further comprises: before the needle is controlled to pass through the needle plate hole in the needle lower needle in the step S10, the upper thread clamp is controlled to be opened so as to loosen the upper thread; before bringing the needle thread end under the needle plate and the needle starts to move back from the lowest position to control the needle to pass through the needle plate hole in step S30, controlling the needle thread clamp to clamp the needle thread; the upper thread clamp is controlled to be opened before the needle is driven through the needle plate hole at step S30 to loosen the upper thread, and then step S30 is performed. Compared with the three embodiments, the upper thread end under the control of the first embodiment is shortest, and the waste thread is less; in the second embodiment, the upper thread keeps a loose state all the time, the thread take-up lever pays out, the needle falls down, more upper threads are torn off, the cut upper thread ends are longest, more waste threads are generated, and even the waste threads can be accumulated; the third embodiment is complicated in control, and the thread released by the thread take-up lever can be held by the thread holder for a period of time, so that the back drawing of the thread taken by the rotating shuttle can be prevented, and even the thread leaves the needle plate hole. The first and third embodiments can determine a specific upper thread clamping time according to the thread cutting length. The length of the end of the upper thread after being cut in the third embodiment is larger than that of the end of the upper thread after being cut in the first embodiment and smaller than that of the end of the upper thread after being cut in the second embodiment.
The step S30 is to complete the stitch embroidery to lock the upper thread, so as to ensure 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 utility model is not limited to embroidery of one stitch or two stitches, and can also complete embroidery of a plurality of stitches according to the need so as to solve the technical problem of the utility model.
The method of the present utility model further includes, prior to step S10, presetting a distance by which the movable knife moves from the initial open position to the stop limit. The thread holding structure is used for keeping the position of the bottom thread fixed, and the distance from the initial opening position to the stop limit of the moving knife is determined according to the distance between the moving knife and the thread holding structure. The distance from the moving knife to the stop limit is set according to the rotation angle of the main shaft of the embroidery machine, when a thread cutting stop limit instruction is received, the moving knife is controlled to move to the stop limit stop according to the preset distance, and when a thread cutting action instruction is received, the moving knife moves from the stop limit to the thread cutting fixed knife direction, so that thread cutting is realized.
The method of the present utility model further includes, prior to step S10, holding the bobbin thread with an embroidery thread holding structure.
The upper thread clamp and the thread take-up lever are all existing components in the embroidery machine. During embroidery, the thread take-up lever is controlled to supply and recover proper amount of upper thread in each working period of the thread forming process, and the thread take-up rule of the thread take-up lever follows a sine curve. The upper thread clamp clamps the upper thread during non-embroidering operation and releases the upper thread during embroidering operation. The utility model aims to describe the cooperation control principle of the components in the thread cutting process, so that other control principles are not repeated in the process of executing embroidery by the embroidery machine, and the working principles of an upper thread clamp holder, a thread take-up lever and the like follow the inherent execution instructions of the embroidery machine.
It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.
Claims (10)
1. The thread cutting method of the embroidery machine is characterized by being applied to a thread cutting device of the embroidery machine, wherein an embroidery thread holding structure is arranged between a movable cutter and a fixed cutter, the embroidery thread holding structure is positioned below the fixed cutter, and the method is applied to a control end of the embroidery machine and comprises the following steps:
step S10, controlling the needle to be in a needle position, and bringing the upper thread end to the lower part of the needle plate;
step S20, after the thread ends are brought below the needle plate, controlling the brake knife to hook the thread ends 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;
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.
2. The thread trimming method of an embroidery machine according to claim 1, wherein step S10 further comprises: before the needle passes through the needle plate hole, the movable knife is controlled to be opened, so that the upper thread can pass through the needle plate hole and pass through the space between the fixed knife and the movable knife, and then is hooked by the rotating shuttle.
3. The thread trimming method of an embroidery machine according to claim 1, wherein step S10 further comprises: after the thread end of the upper thread is brought below the needle plate and before the next needle passes through the needle plate hole, the movable cutter is controlled to be opened, so that the upper thread can pass through the space between the fixed cutter and the movable cutter and can be hooked by the movable cutter.
4. The thread trimming method of an embroidery machine according to claim 1, further comprising: before the needle is controlled to pass through the needle plate hole in the step S10, the upper thread clamp is controlled to clamp the upper thread, and then the step S10 is executed; after step S20 and before the needle is controlled to pass through the needle hole at step S30, the needle thread holder is controlled to be opened to release the needle thread, and then step S30 is performed.
5. The thread trimming method of an embroidery machine according to claim 1, further comprising: before the needle is controlled to pass through the needle plate hole in step S10, the needle thread holder is controlled to open to release the needle thread.
6. The thread trimming method of an embroidery machine according to claim 1, further comprising: before the needle is controlled to pass through the needle plate hole in the needle lower needle in the step S10, the upper thread clamp is controlled to be opened so as to loosen the upper thread; before bringing the needle thread end under the needle plate and the needle starts to move back from the lowest position to control the needle to pass through the needle plate hole in step S30, controlling the needle thread clamp to clamp the needle thread; the upper thread clamp is controlled to be opened before the needle is driven through the needle plate hole at step S30 to loosen the upper thread, and then step S30 is performed.
7. The thread trimming method of an embroidery machine according to claim 1, wherein said step S30 comprises: 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.
8. The thread trimming method of an embroidery machine according to claim 1, further comprising, before step S10, presetting a distance by which the movable knife moves from the initial open position to the stop limit.
9. The thread cutting method of an embroidery machine according to claim 1, further comprising, before step S10, holding the base thread with an embroidery thread holding structure.
10. 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.
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| CN202211705592.8A CN115710783B (en) | 2021-04-27 | 2021-04-27 | Thread cutting method of embroidery machine |
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| CN202110459465.3A CN113322593A (en) | 2021-04-27 | 2021-04-27 | Thread cutting device of embroidery machine and thread cutting method of embroidery machine |
| CN202211705592.8A CN115710783B (en) | 2021-04-27 | 2021-04-27 | Thread cutting method of embroidery machine |
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| CN113846442B (en) * | 2021-11-15 | 2022-07-29 | 诸暨远景机电有限公司 | Thread cutting method of embroidery machine |
| CN114000274B (en) * | 2021-11-30 | 2022-11-11 | 浙江越隆缝制设备有限公司 | Shuttle box body mechanism of embroidery machine |
| CN114000275B (en) * | 2021-11-30 | 2022-11-11 | 浙江越隆缝制设备有限公司 | Thread cutting method for shuttle box body of embroidery machine |
| CN116288977B (en) * | 2023-01-06 | 2024-03-01 | 浙江镨美科智能刺绣设备有限公司 | Thread cutting method of embroidery machine |
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| CN115710783A (en) | 2023-02-24 |
| CN113322593A (en) | 2021-08-31 |
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