JPH10179972A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pass a new thread through a sewing machine needle after automatically withdraw and recover a used thread from the sewing machine needle in the replacement of the thread or the like. SOLUTION: Any one of upper threads 39 of the respective upper threads 39 received in a cheese case of the tension bed 35 side is selected by a thread selecting mechanism 40. The selected upper thread 39 is sent out to the thread introducing nozzle 50 side through a guide roller 46 by a thread feeding roller 52. Air is supplied to a thread introducing nozzle 50 or the like from the outside to generate an air current so that the upper thread 39 is introduced toward the thread paths 12, 20 of a thread path forming mechanism 8 while the upper thread 39 is automatically passed into a thread take-up lever 7 and a sewing machine needle. Also, a thread cutter 71 or the like are disposed in the lower side of the thread introducing nozzle 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine suitably used as a sewing machine or an embroidery machine for, for example, cloth.
In particular, the present invention relates to a sewing machine in which an upper thread or the like can be automatically inserted into a needle hole of a sewing machine needle.

[0002]

2. Description of the Related Art Generally, a sewing machine main body, a head portion provided on the sewing machine main body for reciprocating a sewing needle and swinging a balance, and a plurality of upper threads provided on the head portion to individually separate a plurality of upper threads, respectively. A plurality of sewing needles are provided at the lower end side of the head section corresponding to each upper thread of the thread storage section, and each of the sewing needles is provided from the thread storage section. There is known a sewing machine such as a sewing machine or an embroidery machine in which any one of the sewing needles is selectively driven by a needle selection mechanism in a state where the threads are individually inserted (threaded) in advance. ing.

In this type of conventional sewing machine, each thread from the thread storage section is individually threaded through a plurality of sewing needles provided at a lower end side of the head section by manual operation or the like in advance. In this state, while selecting one of the sewing needles by the needle selection mechanism, the selected sewing needle is moved by the head unit to sew the cloth or the like.

In this case, a plurality of upper thread bobbins are rotatably disposed in the thread storage section, and different types of upper threads are wound around each of the bobbins, and are frequently used. The upper thread is wound around two or three bobbins, and each of these bobbins is accommodated in the thread storage section. Then, when the sewing machine needle is selected by the needle selecting mechanism, the upper thread is individually paid out from each of these bobbins, and a stitch is formed on the cloth or the like by sewing.

[0005]

In the prior art described above, a plurality of sewing needles are provided on a head portion of a sewing machine main body, and each of the sewing machine needles is manually operated in advance. After the individual threading is performed by, for example, one of the sewing needles is selected by the needle selection mechanism prior to the sewing operation, so that not only is the entire head portion large, but also the head portion is provided. It is necessary to manually insert a specific upper thread into each of a plurality of sewing needles in advance,
There is a problem that it becomes a major obstacle in automating a sewing operation or an embroidery operation.

For example, Japanese Patent Application Laid-Open Nos. 61-89365, 6-154453, and 6-182
In a sewing machine described in Japanese Patent Application Laid-Open No. 077 and Japanese Patent Application Laid-Open No. 7-671 (hereinafter referred to as another conventional technique), for example, one of a plurality of threads is selected for one sewing needle provided in a head portion. It has been proposed that the head portion can be inserted through the head portion in a compact size.

However, according to such another conventional technique, when a thread is changed during a sewing operation, an old thread is extracted from a sewing needle and a new thread is automatically threaded through the sewing needle. There is a problem that is difficult. In particular, in the normal case, thread trimming is performed under the sewing cloth when changing the thread (color changing) of the sewing machine. Therefore, the cut end of the old thread often remains as it passes through the sewing cloth. There is a problem that the operation of extracting and collecting an old thread from a sewing needle cannot be automated.

Also, when a thread break occurs during the sewing operation, it is difficult to remove the old thread from the sewing needle and automatically thread the new thread through the sewing needle. While shaping (forming) the end, there is a problem that it is difficult to smoothly guide the shaped thread end side toward the needle hole of the sewing machine needle and to thread the thread with a high probability.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention allows any one of a plurality of threads to be selectively inserted into a sewing needle provided in a head portion, and makes the entire head portion small. It is an object of the present invention to provide a sewing machine in which an old thread can be reliably pulled out from a sewing needle at the time of a thread change or the like and collected, and then a new thread can be automatically threaded through the sewing needle. I have.

Another object of the present invention is to allow a threading component or the like to be retracted from the periphery of the sewing needle when performing a sewing operation in a state where the threading is performed on the sewing needle. Prevent these parts from interfering with sewing work,
An object of the present invention is to provide a sewing machine capable of safely and smoothly performing the entire operation.

[0011]

According to a first aspect of the present invention, there is provided a sewing machine main body and a head unit provided on the sewing machine main body for reciprocating a sewing needle and swinging a balance. A thread storage means for storing a plurality of threads for supplying a thread to the balance and the sewing needle of the head portion; and selectively inserting a thread from the thread storage means into the balance and the sewing needle. Thread inserting means, thread pushing means for pushing the thread at least in a direction of removing the thread from the sewing needle at the time of thread replacement, and the thread in the state where the thread is pushed by the thread pushing means at an intermediate position. And a yarn removing means for removing, from the yarn cut by the yarn cutting means, the yarn remaining on the yarn pushing and moving means side to the outside.

According to the above arrangement, any one of the plurality of yarns stored in the yarn storage means can be selectively inserted into the balance and the sewing machine needle on the head portion side by the yarn insertion means. . When at least thread change of the thread inserted into the sewing machine needle is performed, the thread pushing mechanism can be operated so as to remove the thread from the sewing needle, and in this state, the thread cutting mechanism is operated. By operating the yarn removing means, the yarn remaining on the yarn pushing and moving means side (for example, an old yarn before thread change) can be removed to the outside by operating the yarn removing means. can do.

[0013] In the invention of claim 2, the thread insertion means is provided in the head portion and forms a thread path for inserting a thread through at least the balance and the sewing needle. A yarn guiding mechanism for individually guiding the plurality of yarns stored in the storage means toward one end of the yarn path by the yarn path forming mechanism; and any one of the plurality of yarns guided by the yarn guiding mechanism. A yarn selecting mechanism for selecting one yarn, a yarn feeding mechanism for feeding the yarn selected by the yarn selecting mechanism toward one end of the yarn path, and a gas flowing through the yarn path to form the yarn path. A thread guiding mechanism for guiding the thread toward the other end of the sewing machine and passing the thread through the sewing needle from the thread end, and the thread cutting means is provided between one end of the thread path and the thread feed mechanism. Cuts the leading end side of the yarn sent by the yarn feeding mechanism It is configured to adjust the shape of the yarn end.

In this case, while the plurality of yarns stored in the yarn storage means are individually guided by the yarn guide mechanism toward one end of the yarn path by the yarn path forming mechanism, one of the yarns is guided. Can be selected by the yarn selecting mechanism, and the selected yarn can be sent out toward one end of the yarn path by the yarn feeding mechanism. Next, by operating the thread guiding mechanism in this state, the thread can be guided toward the other end of the thread path by flowing gas through the thread path, and the sewing needle can be guided from the thread end side. Can be inserted.

Further, the yarn cutting means provided between one end of the yarn path and the yarn feeding mechanism cuts the leading end of the yarn which is selected in advance and sent out by the yarn feeding mechanism, so that the yarn end is cut. The shape can be adjusted, and also in this case, the leading end side of the yarn to be cut can be pushed by the yarn pushing means toward the yarn removing means side, and after the yarn has been cut, it remains on the yarn pushing means side. Yarn waste (for example, a tip side portion of the yarn) can be removed to the outside by the yarn removing means. Next, in this state, a gas such as air is circulated in the yarn path by the yarn guiding mechanism while the yarn is being sent out by the yarn feeding mechanism, so that the thread whose thread end has been trimmed is passed through the needle hole of the sewing machine needle. Can be threaded smoothly.

Further, in the invention according to claim 3, the yarn cutting means comprises a pair of pinching blades which are opened and closed in a direction substantially orthogonal to the yarn, and a blade driving mechanism which drives each of the pinching blades to open and close. And a yarn detachment preventing device which is located between one end of the yarn path formed by the yarn path forming mechanism and each of the pinching blades and is fixed to the blade driving mechanism side to prevent the yarn from coming off between the pinching blades. It is composed of

Thus, when each of the pinching blades is driven to open and close by the blade driving mechanism, each of the pinching blades can be opened and closed in a direction substantially perpendicular to the yarn, and the yarn is prevented from coming off from between the pinching blades. It can be prevented by the prevention tool, and the cutting of the yarn can be stably performed by each pinching blade.

Further, in the invention according to claim 4, the yarn pushing-moving means is disposed between one end of the yarn path by the yarn path forming mechanism and the yarn detachment preventing device, and is directed toward the inside of the yarn path. A yarn guide having a guide hole for guiding the yarn, a crossbar which is advanced and retreated so as to cross between the yarn guide and the yarn detachment preventing device, and a leading end side of which is a yarn hooking portion. The thread hook is held at a position retracted from the thread guide, and at least at the time of the thread change, the cross bar is held between the thread guide and the thread detachment preventing device with the thread hooked on the thread hook of the cross bar. And a bar drive mechanism for advancing toward the yarn removing means side.

According to the above construction, the crossbar having the yarn hooking portion at the front end can be moved forward and backward by the bar driving means so as to cross the space between the yarn guide and the yarn detachment preventing device. When the yarn is advanced toward the yarn removing means from between the yarn guide and the yarn detachment prevention device, the yarn can be pushed in the advance direction of the crossbar while the yarn is hooked on the yarn hooking portion of the crossbar. For example, it is possible to pull up the thread in the direction of the crossbar so as to remove the thread from the needle hole of the sewing machine needle, and by cutting the thread in this state,
For example, the old yarn before the yarn change can be reliably removed to the outside.

According to the fifth aspect of the present invention, the yarn sent out by the yarn feed mechanism is guided between the yarn feed mechanism and each of the pinching blades of the yarn cutting means by gas flow. A yarn introduction nozzle for introducing the yarn into the hole is provided. The yarn guide has a lowering position where the upper end side of the guide hole of the yarn guide is below the crossbar, and the upper end side of the guide hole prevents the yarn from coming off. A thread guide elevating mechanism for raising and lowering the thread guide up and down between a tool and an ascending position fitted to the lower end side of the thread introduction nozzle via each pinching blade is provided.

According to the above arrangement, the gas sent out from the yarn feed mechanism is directed into the guide hole of the yarn guide by flowing gas through the yarn introduction nozzle while holding the yarn guide at the raised position. The yarn can be stably introduced, and the yarn can be reliably guided to one end of the yarn path via the yarn guide. Then, after the yarn is introduced into the yarn path side, the yarn guide is lowered to the lower side of the crossbar, so that, for example, when the yarn is changed, the crossbar is moved from between the yarn guide and the yarn detachment prevention device. The thread can be advanced toward the removing means, and the thread changing operation and the like can be stably performed.

On the other hand, in the invention according to claim 6, the yarn removing means is constituted by a yarn sucker for sucking and removing the leading end side portion of the yarn cut by the yarn cutting means to the outside.

Thus, for example, while cutting the thread pushed by the cross bar so as to remove the thread from the needle hole of the sewing machine needle when the thread is changed, the tip side portion of the thread (before the thread change) is cut by the thread sucker. The old thread) can be reliably removed to the outside by suction.

Further, in the invention according to claim 7, the thread path forming mechanism forms a thread path extending in a curved or straight line before and after the balance for inserting the thread into the balance. A path forming section; a thread path forming section for a sewing needle that forms a linearly extending thread path before and after the sewing needle for inserting the thread into a needle hole of the sewing needle; and the thread for the sewing needle. A relay thread path forming section disposed between the path forming section and the balance thread path forming section to relay between the respective thread paths, and the relay thread path forming section is provided after the threading to the sewing machine needle. Is configured to retract together with the sewing machine thread path forming section in a direction away from the sewing machine needle with the thread path opened.

Thus, after the thread has been threaded through the sewing machine needle, the relay thread path forming section can be retracted away from the sewing needle together with the sewing machine thread path forming section, for example, a sewing operation (sewing operation) is started. In this case, the field of view around the sewing needle can be widened, and the relay thread path forming section and the thread path forming section for the sewing needle can be prevented from obstructing the sewing operation.

[0026]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 14 show a case where the sewing machine according to the embodiment of the present invention is applied to an embroidery machine.

In FIG. 1, reference numeral 1 denotes a sewing machine main body which constitutes a main body of the embroidery machine. The sewing machine main body 1 is composed of a base 2 and a head 3 provided on the base 2 shown in FIG. It is configured. The head portion 3 of the sewing machine main body 1 has a base end (not shown) fixed to the base 2, and the front end side is a free end, and an embroidery frame (not shown) on the base 2 and upper and lower portions. Are opposed to each other.

Here, a main shaft (both not shown) driven by a main shaft motor and a driving unit (not shown) for converting the rotation of the main shaft into a reciprocating up and down motion are provided in the head unit 3. The drive unit swings a balance 7 described later up and down, and moves the balance 7 from the lower end of the head unit 3 toward the base 2 as shown in FIG.
The protruding needle shaft 4 and the sewing machine needle 5 are driven up and down as shown in FIG. Further, on the base 2 side, a needle plate 6, a bobbin bobbin wound with a bobbin thread, an embroidery frame origin sensor, a frame limit sensor (all not shown), and the like are provided at a position facing the tip of the sewing needle 5. It is arranged.

Reference numeral 7 denotes a balance projecting from the inside of the head unit 3 to the front side. The balance 7 is swung up and down substantially in synchronism with the sewing machine needle 5 by the driving unit of the head unit 3, and swings down. When moving, a slight slack is given to the upper thread 39 described later between the sewing machine 5 and the upper thread 39 is supplied to the sewing machine needle 5 side. When the balance 7 is swung upward, the upper thread 39 is pulled up from a stitch (not shown) formed on the embroidery cloth by the sewing needle 5 so that The tension is applied via the tone 36 to perform the thread tightening of the seam and the feeding of the upper thread 39. The head unit 3 is provided with a balance position detection sensor, a needle bar top dead center detection sensor, a thread break sensor (all not shown), and the like.

Reference numeral 8 denotes a yarn path forming mechanism provided on the front side of the head section 3. The yarn path forming mechanism 8 includes a thread path forming section 9 for a balance as shown in FIGS. It is composed of a path forming section 15 and a thread path forming section 22 for a sewing needle. 2 to 4.
As shown in FIG. 1, a flat fixed plate 10 fixedly provided on the head portion 3 and a flat movable plate 11 disposed so as to be able to abut and separate from the fixed plate 10 via a guide or the like. A thread path 12 for a balance as a thread path is formed between the abutting surfaces of the movable plate 11 and the fixed plate 10.

Here, the thread path 12 for the balance is provided on the abutting surface between the fixed plate 10 and the movable plate 11, for example, in a semicircular shape or a cross section U.
By engraving the U-shaped concave grooves respectively, the concave grooves are formed as narrow grooves extending in a curved or straight line before and after the balance 7 or the like. As shown in FIG. 4, the thread path 12 for the balance is a first and a first hole which sandwiches a thread hole (not shown) of the balance 7 before and after.
The first thread path 1 is composed of second thread paths 12A and 12B.
2A extends downward from the position of a yarn guide 54 described later,
It is bent in a substantially L-shape with a constant curvature, and
It extends linearly toward the position.

The second yarn path portion 12B extends slightly linearly from the position of the balance 7 and then bends downward in a L-shape with a constant curvature, and is directed toward a relay yarn path 20 described later. It extends linearly diagonally downward. The movable plate 11 of the balance thread path forming section 9 is connected to an actuator 14 described later.
When the abutment surface of the movable plate 11 is brought into close contact with the abutment surface of the fixed plate 10 in an airtight manner on the abutment surface of the fixed plate 10, the balance thread path 12 moves the fixed plate 10 and the movable plate 11. Is formed as an air passage.

Reference numeral 13 denotes a guide hole for the balance formed in the fixed plate 10 and the movable plate 11 of the thread path forming section 9 for the balance. The guide hole 13 for the balance corresponds to the swing locus of the balance 7 as shown in FIG. The balance 7 extends up and down at a constant length to allow the balance 7 to swing up and down during sewing operation (embroidery work). The upper side of the fixed plate 10 and the movable plate 11 of the thread path forming unit 9 for the balance extends along the guide hole 13 for the balance up to the upper end of the guide hole 13 for the balance, and the lower side corresponds to the guide hole 13 for the balance. A lever guide hole 13A formed in an arc shape with a constant curvature is provided. The lever guide hole 13A is configured to allow the thread catching portion 84B side of the thread separating lever 84 described later to swing in the direction of arrow A in FIG.

An actuator 14 is provided between the fixed plate 10 and the movable plate 11 of the balance thread path forming section 9 as a thread path opening means. The actuator 14 is supplied with air pressure from the outside. Thus, the movable plate 11 is moved toward and away from the fixed plate 10 via a guide or the like, and the movable plate 11 is brought into contact with or separated from the fixed plate 10. After the threading operation is completed, the actuator 14 opens the balance thread path 12 by separating the movable plate 11 from the fixed plate 10 before starting the sewing operation, and the upper thread 39 is moved to the balance thread path 12.
From the free state.

Numeral 15 denotes a relay thread path forming section which is provided below the balance thread path forming section 9 and is provided on the front side of the head section 3. The relay thread path forming section 15 is shown in FIGS. As shown in the figure, the upper end is swingably connected to the balance thread path forming portion 9 at the lower end of the fixing plate 10 via a bearing portion 16, and the lower end extends downward to the position of the sewing machine needle 5. When,
A movable plate 19 disposed so as to be able to abut against and separate from the fixed plate 17 via guides 18;
In FIG. 9, a relay yarn path 20 that is located on the side of the abutment surface with the fixing plate 17 and extends downward is, for example, a narrow groove having a U-shaped cross section having a depth of about 0.5 to 1 mm. Is formed.

As shown in FIG. 3 and the like, the relay yarn path 20 has a linear yarn path portion 20A whose upper end is open opposite to the lower end of the balance yarn path 12 and whose lower end extends downward. A curved yarn path portion 20B which is bent in a substantially “L” shape with a constant curvature from the lower end side of the circular yarn path portion 20A and extends in the horizontal direction toward a yarn posture corrector 23 described later. The fixed plate 17 and the movable plate 19 of the relay yarn path forming section 15 are formed in an elongated flat plate shape, and the lower end thereof is curved along the curved yarn path section 20B of the relay yarn path 20.

The fixing plate 17 of the relay yarn path forming section 15
As for the movable plate 19, the respective abutting surfaces are formed as smooth surfaces, and can abut against each other in an airtight state. A plurality of supply / discharge nozzles (not shown) serving as a yarn guiding mechanism are provided in the middle of the balance yarn path 12 and the relay yarn path 20.
These supply / discharge nozzles supply / discharge air from a pressurized air source into / from the balance thread path 12 and the relay thread path 20 via an air supply / discharge valve (not shown) or the like. Road 1
2 and a negative pressure or a positive pressure is generated in the relay yarn path 20;
For example, the upper thread 39 in a state where the thread end is shaped is connected to the thread path 12 for the balance.
And, it is guided to the yarn posture corrector 23 side along the relay yarn path 20.

Reference numeral 21 denotes an actuator provided as a yarn path opening means provided between the fixed plate 17 and the movable plate 19 of the relay yarn path forming section 15. The actuator 21 is supplied with air pressure from outside. The movable plate 19 is moved by each guide 1
The movable plate 19 is driven along 8 to abut or separate from the fixed plate 17. When the movable plate 19 is brought into contact with the fixed plate 17 by the actuator 21 as shown in FIG. 4, the relay yarn path 20 is formed as an air passage between the movable plate 19 and the fixed plate 17.

When the movable plate 19 is separated from the fixed plate 17 in the direction of arrow B in FIG. 4, the actuator 21 opens the relay yarn path 20 so that the upper thread 39 can be detached from the relay yarn path 20. Be free. Further, the lower end of the fixing plate 17 of the relay yarn path forming section 15 is fixed on an extension 30A of a swing bracket 30 described later, and the swing bracket 3
0, the thread path forming section 22 for the sewing needle along the rotation center OO.
At the same time, it is retracted from the front and rear of the sewing needle 5 to the position shown by the imaginary line in FIG. 4 with the swing angle θ.

Reference numeral 22 denotes a thread path forming section for the sewing needle which constitutes the thread path forming mechanism 8 together with the thread path forming section 9 for the balance and the relay thread path forming section 15, and the like. It is composed of a yarn attitude corrector 23 and a yarn suction device 26, which are configured in substantially the same manner as previously proposed by the present applicant in Japanese Patent Application No. 8-75157.

Reference numeral 23 denotes a yarn posture corrector as a yarn posture corrector disposed between the lower end side of the relay yarn path forming part 15 and the sewing machine needle 5 so as to be able to advance and retreat. As shown in FIG. 3 and FIG.
Nozzle half body 24 provided on A and divided into upper and lower parts
A, 24B, a nozzle-like thread path (not shown) formed between the nozzle halves 24A, 24B and extending linearly toward the needle hole 5A of the sewing machine needle 5, and the nozzle halves 24A, 24B
And a correction cylinder 25 which is provided on the extension 30A of the swing bracket 30 adjacent to the cylinder 30 and which abuts and separates the nozzle half bodies 24A and 24B in the vertical direction.

Here, the correction cylinder 25 is configured as an air cylinder as shown in FIG.
The rod 25C is expanded and contracted by supplying and discharging air pressure from 5A and 25B, and the rod 25C moves the upper nozzle half body 24A up and down with respect to the lower nozzle half body 24B. When the nozzle half body 24A rises, it is separated from the nozzle half body 24B, and the nozzle half body 24A
When A descends, the lower surface side of the nozzle half body 24A abuts against the nozzle half body 24B.

When the nozzle halves 24A and 24B abut against each other, the nozzle-like yarn path is formed between the nozzle halves 24A and 24B. In this state, the nozzle-like yarn path has a curved end at one end. The other end faces the needle hole 5A of the sewing machine needle 5 directly opposite to the distal end side of the thread path 20B. Further, the nozzle half body 24A is moved by the correction cylinder 25 to the nozzle half body 24A.
When the needle thread is separated upward from B, the nozzle thread path is opened. For example, the upper thread 39 whose tip side is inserted into the needle hole 5A of the sewing machine needle 5 and extends to the balance 7 side is free from the nozzle thread path. Will be automatically removed.

Further, an air inlet (not shown) or the like is formed in one of the nozzle half bodies 24A and 24B.
The air inlet blows air from the pressure source toward the downstream side of the nozzle-shaped yarn path via an air supply / discharge valve or the like.
Then, the yarn posture corrector 23 is configured such that one end side of the nozzle-shaped yarn path is directly opposed to the distal end side of the curved yarn path portion 20B, and the other end side is directly opposed to the needle hole 5A of the sewing machine needle 5. By ejecting air from the air inlet toward the downstream side of the nozzle-shaped yarn path, the yarn posture of the upper thread 39 is corrected in a straight line in the nozzle-shaped yarn path, while cooperating with a yarn suction device 26 described later. And upper thread 39
Through the needle hole 5A of the sewing needle 5.

Reference numeral 26 denotes a thread sucker as a thread suction unit attached to the swing bracket 30 so as to face the nozzle-shaped thread path of the thread posture corrector 23 with the needle hole 5A of the sewing needle 5 interposed therebetween. One end of the suction device 26 is a small-diameter thread suction portion 26A, which faces the needle hole 5A of the sewing machine needle 5, and the other end is the upper thread 3A.
Nine drawers 26B. Further, an air inlet (not shown) is formed at a middle portion in the length direction of the yarn suction device 26, and the air inlet is used to draw air from the compressed air source into the drawing unit 2.
Distribute to the 6B side. Then, a negative pressure is generated on the side of the yarn suction unit 26A due to the air flow at this time, whereby the upper thread 39 from the yarn posture corrector 23 is inserted into the needle hole 5A of the sewing machine needle 5 and the yarn suction unit 26A Drawer 2 through
It will be led to the position of 6B.

Here, the yarn posture corrector 23 and the yarn suction device 26 are connected to the balance yarn path forming section 9 and the relay yarn path forming section 1.
5 together with the yarn path forming mechanism 8, and the correction cylinder 25 of the yarn posture corrector 23 forms a part of the yarn path opening means. Further, the yarn posture corrector 23 and the yarn suction device 2
The air inlet port 6 and the like together with the supply / discharge nozzles of the balance thread path 12 and the relay thread path 20 constitute a thread guiding mechanism for the upper thread 39, and the upper thread 39 is moved to the needle of the sewing machine needle 5 by air flow as gas. It is guided toward the hole 5A.

Reference numeral 27 denotes a threading detector as threading detecting means provided on the swing bracket 30 so as to face the draw-out portion 26B of the threading device 26, and the threading detector 27 comprises an optical sensor or the like. By detecting whether or not the tip side of the upper thread 39 is pulled out from the pull-out portion 26B of the thread suction device 26, it is detected whether or not the upper thread 39 has been inserted into the sewing machine needle 5. When detecting that the upper thread 39 has been inserted into the sewing machine needle 5, the threading detector 27 outputs a threading completion signal to an embroidery machine control device (not shown) or the like, and a later-described advance / retreat mechanism 28 Activate

Numeral 28 denotes an advance / retreat mechanism for moving the sewing machine thread path forming section 22 forward and backward together with the relay thread path forming section 15 to and from the sewing needle 5. The advance / retreat mechanism 28 is, as shown in FIG. A rotating cylinder 29 disposed on the rotation center OO together with the bearing 16 of the forming section 15, an upper end side is connected to the rotating cylinder 29, and a lower end side faces the sewing machine thread path forming section 22 side. The swing bracket 30 is constituted by a swing bracket 30 as a connecting member extending and a pulley 31 described later, and the swing bracket 30 can detect its swing position by a position detection sensor (not shown).

At this time, as shown in FIG. 3, the lower side of the swing bracket 30 is connected to the lower side of the sewing machine needle 5 by the relay thread path forming section 1.
Extension 30 extending horizontally to the position of the fixing plate 17 of FIG.
A is provided integrally, and the extension portion 30A is configured to integrally support the relay thread path forming section 15 together with the sewing thread path forming section 22 (the thread posture corrector 23 and the thread suction device 26). . Then, the swing bracket 30 is advanced and retracted from the sewing needle 5 with a swing angle θ as shown in FIG. 4 by a rotation source (not shown) such as a stepping motor, and the relay thread path forming section 15 and the sewing thread path forming section. 22 is swung between a threading position indicated by a solid line and a retracted position indicated by a virtual line in FIG.

Reference numeral 31 denotes a pulley integrated with the rotary cylinder 29. The pulley 31 is driven by the rotation source via a timing belt (not shown) or the like. Then, the swing bracket 30 of the advance / retreat mechanism 28 and the pulley 3
1 is the thread path 12 for the balance after threading the sewing machine needle 5;
The yarn path opening means for opening the nozzle-shaped yarn path and the like of the relay yarn path 20 and the yarn attitude corrector 23 is connected to the actuators 14 and 2.
1 together.

Reference numerals 32 and 33 denote fine adjustment mechanisms provided on the back side of the head section 3, and the fine adjustment mechanisms 32 and 33 manually rotate the knobs 32A and 33A in accordance with the type of the sewing needle 5 and the like. The swing bracket 30 is moved in directions indicated by arrows C and D in FIG. As a result, the thread posture corrector 23, the thread suction device 26, etc.
The position is finely adjusted so as to face A before and after.

Numeral 34 denotes a support plate provided on the head portion 3. The support plate 34 is formed of a substantially rectangular flat plate.
A tension table 35, a thread selection mechanism 40, a thread feed mechanism 51, and the like, which will be described later, are provided on the upper side 4. Also, the support plate 3
4, a guide hole 34A is formed as shown in FIG.
The guide hole 34A extends with a certain length in the direction of arrow E in FIG. The nozzle end 50A side of each yarn introduction nozzle 50 described later is inserted into the guide hole 34A so as to be relatively displaceable.

Numeral 35 denotes a tension table which is disposed so as to extend upward from the support plate 34. As shown in FIGS. 1 and 2, the tension table 35 is mounted on a slide plate 42 of a thread selecting mechanism 40 which will be described later. The slide plate 42 is attached and is horizontally moved in the direction of arrow E in FIG. 2 together with the sliding plate 42 when, for example, the upper thread 39 is selected.

As shown in FIG. 2, for example, about 10 to 20 thread tensioners 36, 36,.
(Only five are shown) are provided via the holding plates 37 and the like, and about 10 to 20 cheese cases (not shown) serving as thread storage means are provided behind the holding plates 37. ing. Further, each holding plate 37 is provided with a thread guide portion 38, 38,... Located at a lower side of each thread tension 36, and the thread guide portion 38 is provided together with the tension table 35 from each of the cheese cases. A thread guide mechanism for guiding the upper thread 39 toward each thread introduction nozzle 50 is configured.

In each of the cheese cases, an upper thread 39 as a thread is housed in a wound state via a bobbin (not shown), and these upper threads 39 are mutually different in type (color). It is composed of different yarns and the like. Of the upper threads 39 stored in each cheese case, the same type (color) of the upper thread 39 frequently used is stored in, for example, two cheese cases via bobbins.

Each thread tensioner 36 is provided with a thread take-up spring 36A for applying tension to the upper thread 39 by hooking the upper thread 39 on the outer peripheral side, and lowering the upper thread 39 toward the thread introducing nozzle 50 and the balance 7 side. It is configured to supply yarn by supplying yarn. Each thread tensioner 36 applies a tension of, for example, about 25 to 50 g to the upper thread 39 via a thread take-up spring 36A, and when the upper thread 39 is pulled beyond the tension by the sewing machine needle 5 or the like, the balance 7 side The upper thread 39 is allowed to be supplied toward.

The yarn guides 38 of the tension table 35
Is provided with a yarn cost elimination sensor (not shown) composed of, for example, an optical sensor or the like. Each of these yarn cost elimination sensors detects whether or not the upper thread 39 is inserted into each of the thread guides 38, and the respective upper threads 39 stored in the respective cheese cases are completely removed by the sewing machine operation. It is detected on the upstream side of the thread introduction nozzle 50 whether or not the thread has been consumed, that is, whether or not the upper thread 39 is sequentially consumed by the sewing machine operation and used. As a result, even if a thread break occurs in the upper thread 39 on the head section 3 side of the sewing machine main body 1, in this case, the upper thread 3 is provided in each of the thread cost erasing sensors (the thread guide section 38).
Since the thread 9 is inserted and held, the time when the thread breaks and the thread expenditure (end of use) can be reliably identified on the embroidery machine control device side.

Numeral 40 denotes a thread selecting mechanism for selecting any one of the upper threads 39 guided from each of the cheese cases. The thread selecting mechanism 40 is, as shown in FIGS. A guide table 41 fixed on a plate 34; and a tension table 3 slidably disposed on the guide table 41.
Slide plate 42 for sliding 5 and the like in the direction of arrow E in FIG.
And the support plate 34 fixed to the distal end surface of the slide plate 42.
The slider 43 is configured to move together with the sliding plate 42, and includes a pulley 44 and a guide roller 46 to be described later. On the support plate 34, a position detector for detecting the position of the slider 43 and a yarn selection yarn number sensor for detecting which of the upper yarns 39 is selected (both are shown in the drawing). Zu) etc. are arranged.

Reference numeral 44 denotes a pulley rotatably provided on the guide table 41. As shown in FIG. 1, the pulley 44 is connected via a timing belt 45 to a thread selection motor (not shown) including a stepping motor and the like. , Is rotationally driven by this yarn selection motor. A screw feed mechanism (not shown) is provided between the guide table 41 of the thread selection mechanism 40 and the slide plate 42. In this screw feed mechanism, the pulley 44 is
The sliding plate 42 is slid in the direction indicated by the arrow E in FIG. 2 according to the rotation in the opposite direction. The thread selection mechanism 40 is driven by the thread selection motor via a screw feed mechanism or the like.
3 is driven at a constant pitch, so that any one of the upper threads 39 is transferred to a yarn feed roller 52 to be described later.
Selectively move to the position.

A guide roller 46 is provided on the slider 43 so as to be rotatable.
7 urges the yarn feed roller 52 toward the yarn feed roller 52 so as to be able to contact the yarn feed roller 52. The guide roller 46 rotates in accordance with the yarn feed roller 52 in a state where the guide roller 46 is in contact with the yarn feed roller 52, so that the upper thread 39 selected between the guide roller 46 and the yarn feed roller 52 moves toward the yarn introduction nozzle 50. This is to compensate for being sent out.

Reference numeral 48 denotes an oscillating arm attached to the guide roller 46, 49 denotes a pressing cylinder for moving the guide roller 46 from the yarn feed roller 52 through the oscillating arm 48, and the pressing cylinder 49 includes an air cylinder or the like. That is, when the swing arm 48 is extended as shown in FIG. The pressing cylinder 49 forcibly separates the guide roller 46 from the yarn feed roller 52 in the extended state shown in FIG.
2 is stopped.

Are thread introduction nozzles arranged below the guide roller 46 and arranged on the front side of the slider 43. Each of the thread introduction nozzles 50 is provided with a support plate 34, a thread feed roller 52, And constitutes a thread guide mechanism together with the thread guide portions 38 on the tension table 35 side. Each thread introduction nozzle 50 introduces each upper thread 39 from each cheese case into a thread guide 54 described later.
3 are arranged in a line on the surface side.

The lower end of the yarn introduction nozzle 50 is a nozzle end 50A, and the nozzle end 50A protrudes downward through a guide hole 34A of the support plate 34. When the upper thread 39 is selected, each of the yarn introduction nozzles 50 is moved at a constant pitch in the direction indicated by the arrow E in FIG. 2 together with the slider 43 of the yarn selection mechanism 40. The introduction nozzle 50 (the yarn introduction nozzle 50 corresponding to the selected upper thread 39) faces the yarn guide 54 above and below.

Each of the yarn introducing nozzles 50 is supplied with air from the outside to generate an air flow in the yarn introducing nozzle 50 toward the yarn guide 54 side. 39 is inserted (guided) into the yarn introduction nozzle 50. The leading end of the upper thread 39 sent out from the thread feed roller 52 with a constant feed amount is inserted into the thread introduction nozzle 50 and is further sent downward, so that the thread for the balance is fed through the thread guide 54. It is introduced into the yarn path section 12A of the path forming section 9.

Reference numeral 51 denotes the upper thread 39 selected by the thread selecting mechanism 40.
The yarn feed mechanism 51 feeds the leading end of the upper yarn 39 between the guide roller 46 and the yarn feed roller 52, as shown in FIG.
A yarn feed motor 53 for driving the yarn feed roller 52 to rotate via a belt (not shown) or the like.

Here, the yarn feed motor 53 comprises a stepping motor or the like as shown in FIG.
When the position 6 is in the operating position, the yarn feed roller 52 is rotationally driven with a constant rotation amount. And the yarn feed roller 5
At this time, the upper thread 39 is rotated with the guide roller 46 while nipping the upper thread 39 with the guide roller 46, thereby moving the upper thread 39 toward the yarn introduction nozzle 50 by a predetermined feed amount. It is configured to send only.

A thread guide 54 guides the upper thread 39 from the thread introducing nozzle 50 into the thread path 12A of the thread path forming section 9 for the balance. It constitutes means and is formed in a stepped cylindrical shape as shown in FIG. The inner peripheral side of the thread guide 54 is the upper thread 39.
Guide hole 54A for guiding the thread into the yarn path 12A,
The upper end side of the guide hole 54A expands in a tapered shape.
As shown in the figure, the lower end of the yarn introduction nozzle 50 is detachably fitted.

Reference numeral 55 denotes a thread guide elevating mechanism for raising and lowering the thread guide 54. The thread guide elevating mechanism 55 is disposed on the support plate 34 as shown in FIGS. An elevating cylinder 56 protruding downward from the plate 34, an elevating plate 57 fixed to the lower end of a rod 56A of the elevating cylinder 56, and elevating up and down in accordance with the expansion and contraction of the rod 56A; A pair of elevating guides 58, 58 for guiding
And a support plate 3 for holding the upper end side of each lifting guide 58.
4 and a holder plate 59 fixed to the lower surface side.

Here, an arm portion 57A extending toward the yarn guide 54 is formed integrally with the elevating plate 57, and the thread guide 54 is provided at the tip end of the arm portion 57A by means of, for example, screwing. It is integrated. The lifting cylinder 5
7 comprises an air cylinder or the like as shown in FIG. 7, and the air from the compressed air source is supplied / discharged through the air supply / discharge units 56B and 56C, so that the elevating plate 57 is connected via the rod 56A.
Is moved up and down together with the yarn guide 54.

When the thread guide 54 is at the raised position shown in FIG. 10, the upper side thereof is inserted into a thread detachment prevention member 74 of a thread cutting device 71 described later, and the guide hole 54A is provided.
Is fitted to the front end (lower end) of the yarn introduction nozzle 50. When the thread guide 54 is at the lowered position shown in FIG. 11, its upper end is below the crossbar 60, and the crossbar 60 is
4 is allowed to move in the directions indicated by arrows F1 and F2 in FIG.

Reference numeral 60 denotes the sewing machine needle 5 to the upper thread 3 when changing the thread.
The cross bar 60 is a cross bar that pushes the upper thread 39 in the direction in which the upper thread 9 is removed. The cross bar 60, together with the thread guide 54 and a bar driving mechanism 61 described later, constitutes a thread pushing means. The crossbar 60 is driven in the directions indicated by arrows F1 and F2 by the bar drive mechanism 61 shown in FIG. 8, and is advanced and retracted so as to cross between the thread guide 54 and the thread detachment preventing member 74 as shown in FIG. It is.

Here, the crossbar 60 is a threading portion 60A having a V-shaped tip end. When the crossbar 60 advances in the direction of arrow F1 shown in FIG. 60A is moved toward a yarn sucker 69 described later to a position beyond the yarn sucker 69. At this time, the cross bar 60 applies the upper thread 39 to the thread hook 6
The upper thread 39 is hooked on the thread guide
It is pushed to pull up from the side.

Reference numeral 61 denotes a bar drive mechanism for driving the crossbar 60. The bar drive mechanism 61 is slidably provided in the directions of arrows G1 and G2 as shown in FIG. Rack bar 63
And a pinion 64 that meshes with the rack bar 63 and rotates following the movement of the rack bar 63, meshes with the pinion 64, and meshes with a rack tooth 60 </ b> B formed on the base end side of the crossbar 60. The other pinions 65 and the base ends of the rack bar 63 and the crossbar 60 are
It is composed of press rollers 66, 67 and the like that press toward the 65 side.

Here, the air cylinder 62 of the bar driving means 61 drives the pinions 64 and 65 to rotate by sliding the rack bar 63 in the directions of arrows G1 and G2 in FIG. Rotation is crossbar 6
By being transmitted to the zero rack tooth 60B, the crossbar 60 is advanced and retracted in the directions indicated by arrows F1 and F2 in FIG. The cross bar 60 is connected to the upper thread 3 as shown in FIG.
Until the pushing operation of No. 9 is performed, it continues to retreat in the direction of arrow F2 to the rear side of the yarn detachment preventing tool 74 shown in FIG. 12, and the upper thread 39 is moved toward the yarn introduction nozzle 50 as shown in FIGS. Is compensated for being guided linearly to the yarn guide 54 side.

Reference numeral 68 denotes a bar supporting piece that slides on the lower surface of the cross bar 60. The bar supporting piece 68 is disposed below the cross bar 60 at a position close to the thread detachment preventing member 74 as shown in FIG. The cross bar 60 is slidably guided in the directions indicated by arrows F1 and F2 between the device and the thread detachment preventing device 74.

Reference numeral 69 denotes a yarn sucker constituting a yarn removing means. As shown in FIGS.
It is fixed to the lower surface of the support plate 34 via a mounting bracket 70 or the like via a fixed dimension (for example, about 3 to 5 cm) away from the yarn guide 54, and a yarn suction port 69 </ b> A opens on the upper surface of the yarn sucker 69. ing. Then, the yarn suction device 69 generates a negative pressure in the yarn suction port 69A by air or the like from the compressed air source, and the tip portion of the upper yarn 39 cut by the sandwiching blades 72, 73 of the yarn cutting device 71 described later. Through the thread suction port 69A to the outside of the sewing machine main body 1 or the like.

Reference numeral 71 denotes the upper thread 39 pushed by the cross bar 60.
The thread cutting device 71 is disposed above the thread guide 54 and below the support plate 34, as shown in FIGS. 8 and 9. , A pair of pinching blades 72, 73 opened and closed in a direction substantially orthogonal to the upper thread 39, a blade driving mechanism 76 described later for driving the pinching blades 72, 73 to open and close, and a lower side of the pinching blades 72, 73. And is fixed to the tip end of a support case 77, which will be described later, and is roughly constituted by a thread detachment prevention tool 74 having an insertion hole 74A through which the upper side of the thread guide 54 is inserted.

Here, the upper thread 39 is pushed by the cross bar 60 in the direction of arrow F1 with the upper thread 39 being inserted into the insertion hole 74A as illustrated in FIG. Even in this case, the upper thread 39 is prevented from coming off from between the pinching blades 72 and 73.

The holding blades 72 and 73 are supported by the support case 77.
The upper thread 39 is opened and closed so as to intersect with each other about the upper support pin 75, and cuts the upper thread 39 so as to shape the thread end of the upper thread 39. The sandwiching blades 72 and 73 are configured so that the blades on the tip side can be replaced as necessary. The base holes of the sandwiching blades 72 and 73 are respectively provided with elongated engaging holes 7.
2A and 73A are formed, and projections 82A and 83A of crank gears 82 and 83 to be described later are formed in the engagement holes 72A and 73A.
Are slidably engaged.

Reference numeral 76 denotes a blade drive mechanism for driving the sandwiching blades 72 and 73. The blade drive mechanism 76 has a bracket 77A at one end on the lower surface of the support plate 34 as shown in FIGS. A support case 77 fixed via fixing bolts 78 and the like, an air cylinder 79 fixed to the other end of the support case 77, and arrows H1, H
A rack 80 driven in two directions, rotatably mounted on one end of a support case 77, and a pinion 81 meshed with the rack 80, and rotatably mounted on one end of the support case 77 so as to mesh with the pinion 81. It is roughly constituted by a pair of attached crank gears 82 and 83.

Here, the crank gears 82 and 83 are formed by spur gears or the like having the same shape, and rotate the rack 80, for example, two or three times while the air cylinder 79 makes one reciprocation in the directions indicated by arrows H1 and H2. Are rotated in synchronization with the directions indicated by arrows I1 and I2 and the directions indicated by arrows J1 and J2 via a pinion 81, respectively. And the crank gears 82, 8
3 is provided with projections 82A, 83A which engage with the engaging holes 72A, 73A of the sandwiching blades 72, 73, so that the crank gears 82, 83 can move the rack 80 while the rack 80 makes one reciprocation in the directions indicated by arrows H1, H2. The clamping blades 72 and 73 are opened and closed two or three times.

Reference numeral 84 denotes a thread separating lever provided on the fixing plate 10 side of the balance thread path forming section 9.
As shown in FIG. 1, the base end is connected to an output shaft 85A of a thread separating motor 85 via a worm gear type reduction gear (not shown) with a rotation center 84A as a rotation center 84A. In addition, as shown in FIG.
4B, is inserted into the lever guide hole 13A, and is driven by the thread separating motor 85 so as to swing along the lever guide hole 13A in the direction of arrow A in FIG.

Here, the thread separating lever 84 is connected to the thread hooking section 8.
4B is disposed between the thread paths 12A and 12B of the thread path 12 for the balance so as to face the balance 7 on the left and right as shown by a solid line in FIG. After the threading, the thread separating motor 85 swings (rotates) in a direction indicated by an arrow A to a position far away from the balance 7 as shown by a virtual line in FIG.

The embroidery machine according to the present embodiment has the above-described configuration. Next, the automatic threading operation will be described.

First, as an operation preparation operation of the embroidery machine, the tip side of each upper thread 39 stored in each of the cheese cases on the tension table 35 side is guided to each thread tension 36, and each thread tension 3
6, the upper thread 39 can be given a constant tension, and in this state, the upper thread 39 is moved to the respective thread guides 38.
After that, the slider 43 is guided downward to the front surface side of the slider 43 via each thread holder (not shown).

Next, each of these upper threads 39 is connected to the thread selecting mechanism 4.
The selected upper thread 39 is sent from the leading end side to the yarn introduction nozzle 50 side by the yarn feed roller 52 via the guide roller 46 while selecting one by one at 0. Then, air is supplied and discharged from the outside to the yarn introduction nozzle 50 corresponding to the selected upper yarn 39 to generate an air flow in the yarn introduction nozzle 50 toward the nozzle end 50A side. The upper thread 39 is inserted (guided) into the thread introduction nozzle 50.

In this state, as shown in FIG. 10, the upper end of the yarn guide 54 is
0A, the yarn feed roller 5
The thread feed of the upper thread 39 by the second thread 2 is continued, and the leading end side of the upper thread 39 is further fed downward by about 10 cm from the nozzle end 50A side of the thread introduction nozzle 50 into the thread guide 54, for example. .

Next, in this state, the yarn guide 54 is lowered to the lowered position shown in FIG. 11, and the crossbar 60 is moved across the space between the yarn guide 54 and the yarn detachment preventing member 74 in the direction of arrow F1 in FIG. To advance. Then, the thread hooking section 60A provided on the tip side of the cross bar 60 is moved to a position beyond the thread sucker 69 with a moving amount of, for example, about 5 cm, and the upper thread 39 is hooked on the thread hooking section 60A at this time. Then, the upper thread 39 is pushed from the position of the insertion hole 74A of the thread detachment preventing device 74 to the position of the thread sucker 69.

Then, in this state, the thread cutting device 71 is operated to cut the upper thread 39 between the sandwiching blades 72 and 73, thereby cutting the upper thread 39 projecting downward from the nozzle end 50A of the thread introducing nozzle 50. The end of the yarn is formed into an edge. Further, it is pushed out in the direction of arrow F1 by the cross bar 60, and the pinching blade 72,
The remaining portion of the upper thread 39 separated between the portions 73 is removed to the outside as thread waste by suctioning air with the yarn sucker 69.

Further, the upper end 39 of the upper yarn 39 having been subjected to the yarn end shaping as described above is inserted into the yarn feed roller 50 so that the yarn end side is accommodated in the yarn introduction nozzle 50 until a later-described threading operation is performed. 52 is temporarily reversed, and the yarn end side of the upper thread 39 is once fed back into the yarn introduction nozzle 50 via the guide roller 46. Thus, the yarn end of the upper thread 39 can be prevented from being opened or frayed before the actual threading operation is started, and the yarn end can be maintained in an edge-shaped state.

Thus, the preparation operation as described above is performed for each upper thread 3.
The process is repeated every 9 and each upper thread 39 in a state where the thread end shaping has been performed in advance is kept in each thread introducing nozzle 50. Then, in this state, the actual automatic threading operation is started as follows.

First, in this case, the balance 7 is swung by the spindle motor, and the balance is moved to, for example, a threading position of the balance 7 at a top dead center position (a height position separated from the needle plate 6 by a certain dimension). 7 is moved. Thus, the thread hole of the balance 7 can be aligned between the thread paths 12A and 12B of the thread path 12 for the balance.

Further, the yarn path forming mechanism 8 is operated to bring the nozzle halves 24A and 24B of the yarn posture corrector 23 into abutment with each other, thereby forming the nozzle-shaped yarn path therebetween.
By swinging the swing bracket 30 by the advance / retreat mechanism 28, the thread path forming unit 22 for the sewing machine including the thread posture corrector 23 and the thread suction unit 26 is threaded together with the relay thread path forming unit 15 by the solid line shown in FIG. In the threading position, the nozzle-shaped yarn path of the yarn posture corrector 23 and the yarn suction portion 26A of the yarn suction device 26 are opposed (facing) to the needle hole 5A of the sewing machine needle 5.

Further, the movable plate 11 of the balance thread path forming section 9
Is brought into contact with (fixed to) the fixed plate 10 to form the balance thread path 12 between the fixed plate 10 and the movable plate 11, and the movable plate 19 of the relay thread path forming unit 15 is brought into contact with the fixed plate 17. Then, the relay yarn path 20 is formed between the movable plates 19.

As a result, the curved yarn path portion 20B of the relay yarn path 20 has the front end side facing the nozzle-shaped yarn path of the yarn posture corrector 23. At this time, the thread separating lever 84 is raised to the threading position shown by the solid line by the thread separating motor 85 shown in FIG. 1, and the thread catching portion 84B of the thread separating lever 84 is moved forward with the thread hole of the balance 7 in the left and right directions. To be paired.

Next, the upper thread 39 to be threaded through the sewing needle 5
The slider 43 of the thread selection mechanism 40
Is slid in the lateral direction (the direction indicated by the arrow E in FIG. 2) of the head unit 3 via the screw feed mechanism or the like by the yarn selection motor, so that any one of the yarn introduction nozzles 50 is For example, as shown in FIG.
4 is arranged so as to face the upper and lower sides, and the yarn is selected. Then, the upper thread 39 (the selected upper thread 39) having the thread end side held in a standby state in the thread introduction nozzle 50 can be sandwiched between the thread feed roller 52 of the thread feed mechanism 51 and the guide roller 46. Lead to a state.

Next, in this state, the pressing cylinder 49 is reduced, and the guide roller 46 is urged by the spring 47 shown in FIG. 1 so as to be pressed against the yarn feed roller 52, and the yarn guide 54 is raised as shown in FIG. The yarn guide 54 is temporarily moved to the position, and the upper end side of the yarn guide 54 is fitted to the nozzle end 50A of the yarn introduction nozzle 50. In this state, the yarn feed roller 52 is rotationally driven by the yarn feed motor 53 of the yarn feed mechanism 51 while the air is circulated through the selected yarn introduction nozzle 50, so that the leading end side of the upper yarn 39 becomes the yarn. Guide 54
The thread is fed into the thread path 12 for balance through the like.

At this time, air is supplied / discharged from the supply / discharge nozzles of the balance yarn path forming section 9 and the relay yarn path forming section 15 so that a negative pressure is supplied into the balance yarn path 12 and the relay yarn path 20. Alternatively, an air flow is generated by a positive pressure, and the upper thread 39 having an edge-shaped thread end formed at the leading end side is inserted into the thread hole of the balance 7 from the thread path portion 12A of the balance thread path 12 while further passing through the thread path. The straight yarn path section 20 of the relay yarn path 20 via the section 12B
A, It smoothly guides to the curved yarn path 20B.

In this case, if the upper thread 39 is guided along the balance thread path 12, the relay thread path 20, and the like by the air flow, the upper thread 39 tends to be guided at an excessively high speed.
While the guide roller 46 is driven by the yarn feed roller 52 of the yarn feed mechanism 51, the upper yarn 39 is gradually sent out toward the yarn introduction nozzle 50 side, and the upper yarn 39 in the balance yarn path 12 and the relay yarn path 20 and the like. The moving speed of 39 is controlled to a desired speed.

The thread end side of the upper thread 39 is the thread path 1 for the balance.
When passing between the second yarn path portions 12A and 12B, the upper thread 39 is inserted from the yarn end side into the yarn hooking portion 84B of the yarn separating lever 84 and the yarn hole of the balance 7, and the upper yarn 39 is passed through the relay yarn path. The guide 20 is guided from the 20 curved yarn path section 20B to the yarn posture corrector 23.

Further, on the side of the yarn posture corrector 23 and the yarn suction device 26, air from the compressed air source is blown out toward the downstream side of the nozzle-shaped yarn path via the air introduction port, and the inside of the yarn suction device 26 is also discharged. Air is circulated from the yarn suction section 26A side to the drawing section 26B side, and a negative pressure is generated on the yarn suction section 26A side by the air flow at this time. Then, the yarn posture corrector 23 corrects the yarn posture of the upper thread 39 linearly by the air flow at this time, and inserts the upper thread 39 into the needle hole 5A of the sewing machine needle 5 in cooperation with the yarn suction device 26. Let it.

On the yarn suction device 26 side, the yarn suction portion 26A
The needle thread 39 from the thread posture corrector 23 is sucked into the thread suction portion 26A through the needle hole 5A of the sewing machine needle 5 by the negative pressure generated therein, and is inserted through the needle hole 5A of the sewing machine needle 5. Thread 39
Is guided to the position of the pull-out portion 26B via the yarn suction portion 26A. Then, the drawer 2 of the yarn suction device 26
When the yarn end side of the upper thread 39 comes out from 6B,
By detecting this with the threading detector 27, the automatic threading process is completed.

Next, when the threading to the sewing needle 5 is completed, the supply of air to the thread introduction nozzle 50 is stopped, and the balance thread path forming section 9, the relay thread path forming section 15, and the sewing machine needle thread are formed. The air supply to the road forming part 22 is stopped. Then, the opening operation of the balance yarn path 12 and the relay yarn path 20 is performed by the actuators 14 and 21, and the yarn posture corrector 2 is opened.
The nozzle-shaped yarn path No. 3 is opened by the correction cylinder 25.
The thread guide 54 is moved from the raised position shown in FIG.
Is preferably moved to the lowering position shown in FIG.

At this time, by moving the swing bracket 30 of the advance / retreat mechanism 28 by the swing angle θ shown in FIG. 4, the thread path forming for the sewing machine needle comprising the thread posture corrector 23 and the thread sucker 26 is formed. The section 22 is retracted from the threading position shown by the solid line in FIG. 4 to the retracted position shown by the phantom line together with the relay yarn path forming section 15.

As a result, when threading the sewing machine needle 5, the upper thread 39 guided into the thread path 12 for the balance, the relay thread path 20, and the nozzle posture corrector 23 passes through these thread paths 12,
It will be in a free state from 20 etc. and will be automatically removed. Further, since the relay thread path forming unit 15 is retracted together with the sewing needle thread path forming unit 22 to the position indicated by the imaginary line in FIG. Section 15 and thread path forming section 22 for the sewing needle
Can be greatly separated, and the field of view around the sewing needle 5 can be widened.

Next, in this state, the yarn separating lever 84 is moved by the yarn separating motor 85 into an arc-shaped lever guide hole 1.
It is lowered (oscillated) downward along 3A, and the thread catching portion 84B of the thread separating lever 84 is largely separated from the balance 7 in the direction of arrow A. Then, in a state where the thread path 12 and the like for the balance in the thread path forming unit 9 for the balance are opened, the thread hooking portion 84B of the thread separating lever 84 is largely separated from the balance 7 so that the curved thread path 12 and the like for the balance. Is pulled between the thread hole of the balance 7 and the thread hooking portion 84B of the thread separating lever 84, and the slack of the upper thread 39 is removed prior to the subsequent embroidery operation (sewing operation). Allow to absorb.

Next, in this state, the guide roller 46 is retracted by the pressing cylinder 49 against the spring 47 to the inoperative position shown by the dotted line in FIG.
Nine smooth feeding is possible. In this case, at the stage where the threading is completed, the threaded upper thread 39 is clamped by the corresponding thread holder or the like, and then the above-described thread path opening processing, the retreat operation of the guide roller 46, and The slack absorbing process of the upper thread 39 by the thread separating lever 84 may be performed, and then the clamp by the thread holder may be released.

Next, when the sewing machine operation is started, the spindle motor, the frame moving mechanism of the embroidery frame and the like are driven based on the embroidery data, and the sewing needles 5 are sequentially moved to create an embroidery pattern on the embroidery cloth or the like. I do. When the sewing machine needle 5 moves, the upper thread 39 is completely separated from the balance thread path 12 and the relay thread path 20 and the like.
In accordance with the swing of the balance 7, an appropriate tension can be applied by the thread tension 36 on the tension base 35 side, etc., and low friction yarn feeding toward the sewing machine needle 5 side can be performed. 39 can be reliably prevented from being caught on the balance thread path 12, the relay thread path 20, and the like.

Next, during the embroidery operation as described above, the upper thread 3
When the thread change or the color change of the sewing machine 9 is performed, for example, the needle plate 6 (see FIG. 3) in a state in which the movement of the sewing machine needle 5 is stopped.
After the lower thread or upper thread 39 is forcibly trimmed on the lower side, the cross bar 60 is moved in the direction indicated by the arrow in FIG. 8 to remove the upper thread 39 from the needle hole 5A of the sewing machine needle 5 at this time. In the direction F1, the vehicle advances from the position indicated by the solid line to the position indicated by the virtual line. In this case, the guide roller 46 is urged by the spring 47 shown in FIG. 1 so as to be pressed against the yarn feed roller 52, and the upper yarn 39 is held in advance above the yarn introduction nozzle 50. Is good.

Then, the crossbar 60 is advanced in the direction of arrow F1 so that the crossbar 60 crosses between the thread detachment preventing device 74 of the thread cutting device 71 and the thread guide 54 as shown in FIG. The upper thread 39 is pushed by the cross bar 60 to the position of the thread sucker 69 in a state where the upper thread 39 is hooked on the thread hook portion 60A of the sewing machine 60. The upper thread 39 can be pulled up to the yarn guide 54 side so as to be pulled out, and at this time, the upper thread 39 comes off from between the pinching blades 72 and 73.
Can be reliably prevented.

Thus, the yarn detachment preventing device 74 and the yarn guide 5
The upper thread 39 can be reliably cut between the pinching blades 72 and 73 of the thread cutting device 71 in a state where the upper thread 39 is pulled by the cross bar 60 between the upper thread 4 and the upper thread 39. It can be carried out. The pinching blade 7 of the thread cutting device 71
A portion of the upper thread 39 (an old thread before thread change) that has been cut off from the thread introduction nozzle 50 side between the thread guide nozzles 2 and 73 and is left on the thread guide 54 side is moved by the cross bar 60 toward the position of the thread sucker 69. By being pushed in the direction F1 as shown in the figure, the tip side is reliably pulled out from the needle hole 5A of the sewing machine needle 5, and the air is sucked by the operation of the thread sucker 69, for example, to the outside of the sewing machine main body 1. It is removed by suction.

The nozzle end 50A of the yarn introduction nozzle 50
Upper thread 3 extending slightly downward from the thread and having a thread end shaped
9, the yarn feed roller 52 is temporarily rotated reversely so that the yarn end side is accommodated in the yarn introduction nozzle 50 in the same manner as in the preparation operation described above, and the guide roller 46 is rotated.
The thread end side of the upper thread 39 is once fed back into the thread introduction nozzle 50 via the. Then, the yarn end of the upper thread 39 is prevented from being opened or frayed by the next threading operation.

Further, in this state, the next upper thread 39 for thread changing (color changing) is selected by the thread selecting mechanism 40, and the selected upper thread 39 is fed from the front end side by the yarn feed roller 52 via the guide roller 46. The yarn is fed to the yarn introduction nozzle 50 side.
At this time, the yarn guide 54 is moved to the raised position shown in FIG. 10 in advance, and its upper end is fitted to the nozzle end 50A of the yarn introduction nozzle 50. Then, in this state, by continuing the yarn feeding of the upper yarn 39 by the yarn feeding roller 52, the leading end side of the upper yarn 39 is adjusted from the nozzle end 50A side of the yarn introduction nozzle 50 through the yarn guide 54 to the balance. It is introduced toward the yarn path 12, and the automatic threading operation is performed in the same manner as described above.

On the other hand, even if a thread break occurs during the driving of the sewing machine needle 5 or the like, the crossbar 60 is pointed toward the position of the thread sucker 69 as shown in FIG. The thread cutting device 71 is operated in the state where the thread is advanced in the F1 direction, and, for example, the upper thread 39 remaining on the balance 7 side or the like is sucked and removed to the outside by the thread sucker 69. In this case, the upper thread 39 whose thread end is shaped by the sandwiching blades 72 and 73 of the thread cutter 71 is guided by the thread feed roller 52 to the guide roller 4.
The automatic threading process is carried out in the same manner as described above, while being sent out to the thread introduction nozzle 50 side via 6 and being introduced to the thread guide 54 side.

Further, when a thread expenditure state occurs in which the used upper thread 39 is completely consumed during the sewing operation,
For example, this is detected by the yarn cost elimination sensor provided in each of the thread guide portions 38 of the tension table 35. In this case, the same type of upper thread 39 stored in each of the cheese cases is sewn to the sewing needle 5
In order to perform automatic threading, thread processing is performed in the same manner as in the above-described operation preparation work. Then, when the same thread (color, color type, etc.) is set in another thread number in advance, automatic thread change processing can be executed.

Thus, according to the present embodiment, the head 3
The needle thread 5A of the sewing machine needle 5 provided in the
, 39,... Can be selectively inserted, thread selection and threading can be automated, and it is not necessary to provide a needle selection mechanism or the like as in the prior art on the head unit 3 side. Can be simplified and the whole can be miniaturized, and the upper thread 39 can be smoothly guided toward the needle hole 5A of the sewing machine needle 5.

In this case, in the preparation stage of the automatic threading operation,
The yarn feed roller 52 feeds the upper yarn 39, and the upper yarn 3
9 is preliminarily fed downward from the nozzle end 50A side of the yarn introduction nozzle 50 into the yarn guide 54, and in this state, the cross bar 60 is moved in the direction of arrow F1 in FIG. The upper thread 39 is advanced so as to cross the gap between the upper thread 39 and the thread detachment preventing device 74.
4 from the position of the insertion hole 74A to the position of the yarn sucker 69.

As a result, the thread cutting device 71 is operated with a certain amount of tensile force applied to the upper thread 39, and the pinching blade 7
The upper thread 39 can be reliably cut between the 2, 73 and the cut end of the upper thread 39 protruding downward from the nozzle end 50A of the thread introduction nozzle 50 can be formed in an edge shape. It can be done easily. Also, crossbar 6
0, it is pushed out in the direction of arrow F1 and the yarn introduction nozzle 5
The remaining upper thread 39 cut off between the sandwiching blades 72 and 73 from the zero side can be reliably collected by suctioning the air with the thread sucker 69.

In this state, the yarn feed roller 52 is driven to rotate by the yarn feed motor 53 of the yarn feed mechanism 51 while the air is circulated through the selected yarn introduction nozzle 50 so that the tip end of the upper thread 39 is moved. The thread path 1 for the balance via the thread guide 54 and the like
2 and the air is supplied / discharged from the supply / discharge nozzles of the balance yarn path forming unit 9 and the relay yarn path forming unit 15, so that the negative pressure is supplied into the balance yarn path 12 and the relay yarn path 20. Alternatively, an air flow is generated by positive pressure, and the upper thread 39 having an edge-shaped thread end formed at the leading end side is inserted into the thread hole of the balance 7 between the thread attitude corrector 23 and the thread suction device 26. The upper thread 39 can be smoothly and stably inserted from the thread end side into the needle hole 5A of the sewing machine needle 5.

Further, a threading detector 27 for detecting whether or not the upper thread 39 has been inserted into the sewing machine needle 5 is provided on the side of the pull-out portion 26B of the thread suction device 26, and a signal from the threading detector 27 is provided. After threading the sewing machine needle 5, the actuators 14, 21 and the like can be automatically operated to open the balance thread path 12, the relay thread path 20, and the like.
By moving the swing bracket 30 of FIG. 8 by the swing angle θ shown in FIG.
Sewing machine thread path forming unit 22 composed of
4 together with the threading position shown by the solid line in FIG.

As a result, after threading the sewing machine needle 5, the upper thread 39 guided into the nozzle thread path of the balance thread path 12, the relay thread path 20, and the thread posture corrector 23 is moved to these thread paths 1.
It can be automatically withdrawn from 2, 20, etc. as a free state. By greatly retracting the relay thread path forming section 15 and the sewing needle thread path forming section 22 from around the sewing machine needle 5, the field of view can be widened around the sewing machine needle 5,
For example, it is possible to prevent the relay thread path forming section 15 and the sewing needle thread path forming section 22 from being in the way during embroidery work, etc.
The whole work can be performed safely and smoothly.

Further, by keeping the thread threading portion 84B of the thread separating lever 84 largely apart from the balance 7 with the balance thread path 12 and the like of the balance thread path forming section 9 open, a curved balance thread is formed. The upper thread 39 that is slack along the path 12 or the like is pulled between the thread hole of the balance 7 and the thread hooking portion 84B of the thread separating lever 84, and the upper thread 39 is preceded by the embroidery operation.
The slack can be automatically absorbed, and by performing the sewing operation in this state, the supply of the upper thread 39 to the sewing needle 5 can be performed smoothly.

When changing the thread or changing the color of the upper thread 39 during the embroidery operation, the cross bar 60 should be moved so as to cross between the thread breaker 74 of the thread cutting device 71 and the thread guide 54. In the direction indicated by arrow F1 in FIG.
9 is pushed to the position of the yarn sucker 69 by the cross bar 60, so that the upper thread 39 is pulled by the cross bar 60 between the yarn detachment preventing device 74 and the yarn guide 54 in a state where the upper thread 39 is pulled. The upper thread 39 can be reliably cut between the pinching blades 72 and 73, and at this time, the thread end of the upper thread 39 can be simultaneously shaped.

Then, the tip side of the upper thread 39 (old thread before thread replacement) remaining on the thread guide 54 side at this time is pushed by the cross bar 60 toward the position of the thread sucker 69. The upper thread 39 can be reliably pulled out from the needle hole 5A of the sewing machine needle 5, and the thread sucker 69
The air can be removed to the outside by the air suction, and the old thread can be easily collected.

Further, in a state where the upper thread 39 is pushed to the position of the thread sucker 69 by the cross bar 60 as shown in FIG. The upper thread 39 may be cut by the pinching blades 72 and 73 of the cutting device 71. In this case, the upper thread 39 can be reliably cut by the thread cutting device 71 in a state where a larger tension is applied to the upper thread 39. Thus, the yarn end of the upper thread 39 can be shaped more effectively.

The upper thread 39 cut by the thread cutting device 71 has a nozzle end 50A of the thread introduction nozzle 50.
By temporarily reversing the yarn feed roller 52 of the yarn feed mechanism 51 while keeping the yarn end side extending slightly downward from the
6, the yarn end side of the upper thread 39 can be stored in the yarn introduction nozzle 50, and the yarn end of the upper thread 39 can be stored in the next threading operation. It can surely prevent the fiber from being unraveled or frayed by time.

Further, since the tension base 35 is provided on the head portion 3 of the sewing machine main body 1 and each thread tension 36 is provided on the tension base 35 side, the balance thread is formed by the balance thread path forming section 9. It is not necessary to provide a separate thread tension or the like in the middle of the path 12, and the shape of the balance thread path 12 by the balance thread path forming section 9 can be greatly simplified.
In step 2, the upper thread 39 can be guided very smoothly along the balance thread path 12 by the air flow from the supply / discharge nozzle.

In the above-described embodiment, after the automatic threading of the sewing machine needle 5, the thread separating motor 84 causes the thread separating lever 84 to swing largely downward along the lever guide hole 13A before the subsequent sewing operation. Upper thread 3
Although the present invention has been described as absorbing the slack of 9 or the like, the present invention is not limited to this. For example, the swing position when swinging the thread separating lever 84 downward by the thread separating motor 85 is variably adjusted. It may be.

When the sewing machine is actually operated, the swing position of the thread separating lever 84 is set for every stitch, for example, 5 to 10 mm.
By changing the stroke with an appropriate stroke amount, the thread handling lever 84 can be provided with a thread tension function. When the embroidery pattern has a swing width such as a satin pattern, for example, the thread separating lever 84 is set in proportion to the swing width.
By adjusting the swinging position of, appropriate tension can be applied to the upper thread 39 and the like.

In the above-described embodiment, it is assumed that the upper thread 39 automatically comes out of the thread suction portion 26A of the thread suction device 26 after threading the sewing machine needle 5, and the thread suction device 26 As described above, the case in which the two-piece structure is not adopted has been described as an example. Alternatively, for example, in a case where a thread gripper or the like is provided on the threading detector 27 side, the yarn suction device 26 may have the two-piece structure. It is good to do.

Further, in the above-described embodiment, the case where the automatic threading device is applied to a single-head type embroidery machine has been described as an example. However, the present invention is not limited to this. May be applied to an industrial sewing machine or the like as a sewing machine.

[0133]

As described above in detail, according to the first aspect of the present invention, any one of the plurality of threads stored in the thread storage means is threaded by the thread insertion means and the balance and sewing machine needle on the head portion side. When the thread inserted into the sewing machine needle is to be selectively changed and the thread inserted into the sewing machine needle is to be changed, the thread is pushed in the direction of removing the thread from the sewing machine needle by the thread pushing means, and the thread is cut in this state. Activate the means to cut the yarn from the middle part,
Since the thread remaining on the side of the thread pushing means is removed to the outside by the thread removing means, any one of the plurality of threads can be selectively inserted into a sewing needle provided in the head section, and the entire head section can be inserted. Can be reduced, the old thread can be reliably removed from the sewing needle when the thread is changed or the like, and the new thread can be automatically threaded through the sewing needle.

Further, in the invention of claim 2, the yarn inserting means comprises a yarn path forming mechanism, a yarn guiding mechanism, a yarn selecting mechanism, a yarn feeding mechanism, and a yarn guiding mechanism, and the yarn cutting means is provided for the yarn path. It is provided between one end side and the yarn feed mechanism, and the end of the yarn sent by the yarn feed mechanism is cut to adjust the shape of the yarn end. By individually guiding the yarn toward the yarn path of the yarn path forming mechanism by the yarn guiding mechanism, one of the yarns can be selected by the yarn selecting mechanism, and the selected yarn is sent to the yarn path side by the yarn feeding mechanism. Can be sent out,
By operating the yarn guiding mechanism in this state and flowing gas through the yarn path, the yarn can be guided smoothly along the yarn path, and this yarn can be reliably inserted from the yarn end side into the sewing machine needle. it can.

The yarn cutting means provided between one end of the yarn path and the yarn feed mechanism cuts the leading end side of the yarn which is selected in advance and is sent out by the yarn feed mechanism, so that the yarn end is cut off. The shape can be adjusted, and also in this case, the leading end side of the yarn to be cut can be pushed by the yarn pushing means toward the yarn removing means side, and after the yarn has been cut, it remains on the yarn pushing means side. The front end portion of the yarn can be removed to the outside by the yarn removing means. Further, in this state, while the yarn is being sent out by the yarn feeding mechanism, a gas such as air is circulated in the yarn path by the yarn guiding mechanism, so that the yarn with the trimmed yarn end is fed to the needle hole of the sewing machine needle. Can be reliably guided,
Automatic threading can be performed stably.

According to the third aspect of the present invention, since the thread cutting means is constituted by a pair of pinching blades, a blade driving mechanism and a thread detachment preventing device, each pinching blade is opened and closed by the blade driving mechanism. The blade can be opened and closed in a direction substantially perpendicular to the yarn, and the cutting of the yarn can be surely performed, and the yarn can be prevented from coming off from between each of the sandwiching blades by the yarn detachment prevention device. Thread trimming can be executed stably.

Further, in the invention of claim 4, since the yarn pushing means is constituted by a yarn guide, a crossbar and a bar driving mechanism, the crossbar having a yarn hooking portion on the leading end side is formed by the bar driving means. When the yarn is advanced toward the yarn removing means so as to cross between the guide and the yarn detachment preventing device, the yarn is pushed in the advance direction of the crossbar while the yarn is hooked on the yarn hooking portion of the crossbar. For example, the thread can be pulled in the direction of the crossbar so as to remove the thread from the needle hole of the sewing needle. Then, by cutting the yarn in this state, the yarn portion (for example, an old yarn before the yarn change) on the tip side of the cut portion can be reliably removed to the outside.

According to the fifth aspect of the present invention, a yarn introduction nozzle is provided between the yarn feed mechanism and each of the pinching blades of the yarn cutting means, and the yarn guide is moved up and down by a yarn guide elevating mechanism. Since it is configured to move up and down, the gas sent out from the yarn feeding mechanism is stabilized toward the inside of the guide hole of the yarn guide by flowing gas through the yarn introduction nozzle while holding the yarn guide at the ascending position. This yarn can be reliably guided to one end of the yarn path via the yarn guide. Then, after the yarn is introduced into the yarn path side, the yarn guide is lowered to the lower side of the crossbar, so that the yarn guide and the yarn detachment prevention device can be interposed, for example, at the time of yarn change or yarn breakage. , The crossbar can be advanced toward the yarn removing means side, and the operation of shaping the yarn end and removing old yarn can be stably performed.

On the other hand, in the invention of claim 6, since the yarn removing means is constituted by the yarn sucking device for sucking and removing the tip end portion of the yarn cut by the yarn cutting means to the outside,
For example, at the time of yarn change or when a yarn break occurs, the yarn is pushed toward the yarn sucker by the yarn pushing means while cutting the yarn, and the leading end portion of the cut yarn is removed by the yarn sucker. Suction can be reliably removed and old yarn can be effectively collected.

[0140] In the invention of claim 7, the thread path forming mechanism is constituted by a thread path forming section for a balance, a thread path forming section for a sewing needle, and a relay thread path forming section, and after the thread is passed through the sewing machine needle. In the state where the thread path is opened, the relay thread path forming section is retracted in a direction away from the sewing needle together with the thread path forming section for the sewing machine needle. Can be prevented and the relay thread path forming section and the thread path forming section for the sewing needle can be prevented from obstructing the sewing operation, whereby the whole operation can be performed safely and smoothly.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an automatic threading device and the like provided in an embroidery machine according to an embodiment of the present invention.

FIG. 2 is a partially cutaway left side view showing the embroidery machine, the automatic threading device, and the like in FIG.

FIG. 3 is an enlarged view showing a head portion, a yarn path forming mechanism, and the like in FIG. 2;

FIG. 4 is an enlarged view showing a yarn path forming mechanism and the like in FIG. 1;

FIG. 5 is a left side view showing an advance / retreat mechanism and the like in FIG. 3;

6 is a partially broken front view showing, in an enlarged manner, a thread path forming portion for a balance, a thread introduction nozzle, a thread guide, and the like in FIG. 1;

FIG. 7 is a partially cutaway left side view showing a thread path forming portion for a balance, a thread introduction nozzle, a thread guide, and the like in FIG. 6;

FIG. 8 is a cross-sectional view showing a bar driving mechanism of the crossbar, a thread cutting device, and the like, as viewed from the direction indicated by arrows VIII-VIII in FIG.

9 is an enlarged cross-sectional view showing a yarn guide, a cross bar, and the like, as viewed from the direction indicated by arrows IX-IX in FIG.

FIG. 10 is a partial cross-sectional view showing a state where the yarn guide in FIG. 6 is arranged at a raised position.

FIG. 11 is a partial cross-sectional view of the same position as FIG. 10 showing a state where the thread guide is arranged at a lowered position.

FIG. 12 is a partially enlarged view of FIG. 8 showing a cross bar, a thread cutting device, and the like.

FIG. 13 is a partially broken plan view showing the thread cutting device in FIG. 12 in an enlarged manner.

FIG. 14 is an operation explanatory view showing a rack, a pinion, and a crank gear in FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing machine main body 2 base 3 head part 5 sewing machine needle 7 balance 8 thread path forming mechanism 9 thread path forming section for balance 12 thread path for balance 14, 21 actuator 15 relay thread path forming section 16 bearing section 20 relay thread path 22 sewing machine Needle thread path forming section 23 Thread posture corrector 26 Thread suction device 27 Threading detector 28 Advance / retreat mechanism 30 Swing bracket 34 Support plate 35 Tension table 36 Thread tension 38 Thread guide section (yarn guide mechanism) 39 Upper thread (yarn) 40) thread selection mechanism 43 slider 46 guide roller 49 pressing cylinder 50 thread introduction nozzle 51 thread feed mechanism 52 thread feed roller 53 thread feed motor 54 thread guide 55 thread guide elevating mechanism 56 elevating cylinder 60 cross bar (yarn pushing means) 61 Bar drive mechanism 69 Thread sucker (yarn removing means) 71 Thread cutting device (yarn cutting means) 72, 73 Nipping blade 7 Yarn out preventer 76 blade drive mechanism 84 yarn separating lever 85 yarn separating motor

Claims (7)

[Claims] 1. A sewing machine main body, a head provided on the sewing machine main body for reciprocating a sewing needle and swinging a balance, and a plurality of threads for supplying a thread to the balance and the sewing needle of the head. A thread storing means for storing a thread, a thread inserting means for selectively inserting a thread from the thread storing means into the balance and the sewing needle, and a thread inserting means for extracting the thread from the sewing needle at least when changing the thread. A thread pushing means for pushing a thread, a thread cutting means for cutting the thread from an intermediate position in a state where the thread is pushed by the thread pushing means, and a thread among the threads cut by the thread cutting means A thread removing means for removing a thread remaining on the pushing means side to the outside; 2. A thread path forming mechanism provided in the head section for forming a thread path for inserting a thread into at least the balance and a sewing needle, and a plurality of thread paths housed in the thread storage section. A yarn guiding mechanism for individually guiding the yarns toward one end of the yarn path by the yarn path forming mechanism, and a yarn for selecting any one of a plurality of yarns guided by the yarn guiding mechanism A selection mechanism, a yarn feed mechanism that sends out the yarn selected by the yarn selection mechanism toward one end of the yarn path,
A thread guiding mechanism that guides the thread toward the other end of the thread path by passing gas through the thread path, and inserts the thread from the thread end side into the sewing machine needle. By providing between one end of the yarn path and the yarn feed mechanism,
2. The sewing machine according to claim 1, wherein a tip end side of the thread sent by the thread feed mechanism is cut to adjust the shape of the thread end. 3. The yarn cutting means includes a pair of pinching blades that are opened and closed in a direction substantially orthogonal to the yarn, a blade drive mechanism that opens and closes each of the pinching blades, and the yarn path forming mechanism. And a thread detachment preventive device positioned between one end of the thread path and each of the pinching blades and fixed to the blade drive mechanism to prevent the thread from coming off from between the pinching blades. Item 3. The sewing machine according to Item 2. 4. A guide hole provided between the one end of the yarn path by the yarn path forming mechanism and the yarn detachment preventing means, and configured to guide the yarn toward the inside of the yarn path. A thread bar having a thread guide portion which is advanced and retreated so as to traverse between the thread guide and the thread detachment preventing device, and a tip end side of which is a thread hook portion. The crossbar is held at the retracted position and at least at the time of the yarn replacement, the crossbar is hooked on the yarn hooking portion of the crossbar, and the crossbar is directed toward the yarn removing means from between the yarn guide and the yarn detachment prevention device. 4. The sewing machine according to claim 3, further comprising a bar drive mechanism that is advanced. 5. A yarn sent out by the yarn feed mechanism is introduced between the yarn feed mechanism and each of the sandwiching blades of the yarn cutting means into a guide hole of the yarn guide by a gas flow. A lowering position where the upper end side of the guide hole of the yarn guide is below the crossbar, and the upper end side of the guide hole is located between the yarn detachment prevention tool and each of the pinching blades. The yarn guide is moved up and down to a raised position where it is fitted to the lower end side of the yarn introduction nozzle via
5. The sewing machine according to claim 4, wherein a thread guide elevating mechanism for elevating and lowering is provided. 6. The yarn removing device according to claim 1, wherein said yarn removing means is constituted by a yarn sucking device which sucks and removes a leading end portion of the yarn cut by said yarn cutting means to the outside. Sewing machine. 7. A thread path forming section for a balance, which forms a thread path extending in a curved or straight line before and after the balance for inserting a thread into the balance, and a thread path forming mechanism; In order to insert the thread through the needle hole of the needle,
A thread path forming portion for a sewing needle that forms a thread path extending linearly over the rear, and a thread path forming section for the sewing machine that is disposed between the thread path forming section for the sewing needle and the thread path forming section for the balance. A relay thread path forming section for relaying, the relay thread path forming section being separated from the sewing machine needle together with the sewing needle thread path forming section in a state where the thread path is opened after threading the sewing machine needle. The sewing machine according to claim 2, 3, 4, 5, or 6, wherein the sewing machine is retracted.