JP2003313751A - Method and apparatus for removing defective thread in loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the terminal part of a normal thread at the opposite side of a thread-feeding part from being lead into a warp shedding according to the pulling out of a defective thread. <P>SOLUTION: The technique for removing the defective thread comprises holding the terminal part of the defective thread at the opposite side of the thread-feeding part by a pneumatic weft thread-holding device which holds the terminal parts of one or more of beaten weft threads by sucking, at the initial time of removal operation of the defective thread. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for removing defective yarn in a loom such as a jet loom.

[0002]

[Prior art]

As one of the shuttleless looms such as a jet loom, while the weft-inserted weft-holding device holds the end portion (tip end) of the weft yarn on the side opposite to the feed side, the weft yarn is beaten. There are some (Japanese Patent Laid-Open Nos. 9-78404 and 2000-328399). In this weaving machine, weft yarns that have failed in weft insertion, that is, defective yarns, are removed while the loom is stopped (stopped).

However, in this loom, the weft holding device also stops the weft suction by the weft holding device. Therefore, when attempting to pull out the defective yarn from the warp opening to the yarn supplying side, the weft is normally inserted into the woven fabric. The anti-feed side end of the weft is pulled back into the warp opening due to friction between the defective yarn and the anti-feed side end of the defective yarn, and the end of the normal weft is woven into the woven fabric. The result is a weaving defect.

As another type of shuttleless loom, a weft removing device for reversing the loom after the loom is stopped and reversing the gripping body (weft gripping device) to release the grip of the defective yarn woven immediately before. There is one provided with (Japanese Patent Laid-Open No. 10-20
4758).

[0006]

[Problems to be Solved] However, in the above weft removing device, even when the grip body is reversed, even the normal weft thread may come off from the grip body. Can't hold.

An object of the present invention is to prevent the normal yarn from being pulled into the warp opening due to the pulling out of the defective yarn from the end on the side opposite to the yarn feeding side.

[0008]

SOLUTION, ACTION, EFFECT The defective yarn removing method according to the present invention includes defective yarns (long picks, broken cylinders) whose tip reaches a side opposite to the normal weft insertion arrival position, and the above weft insertion. At least during the initial removal work of defective yarns (show topics) that do not reach the anti-feeding side from the reaching position (hereinafter, they are collectively referred to as "defective yarns") Actuating a pneumatic weft end retainer that holds the yarn end by suction.

The defective yarn removing device according to the present invention is a pneumatic weft end holding device for holding one end of one or more repulsed weft yarns on the anti-feeding side by suction, and at least during initial removal work of defective yarns. And a drive device for operating the weft end holding device.

According to the above-described removing method and apparatus, the defective yarn is at least at the end portion of the normal weft yarn inserted immediately before the defective yarn, which is opposite to the yarn feeding side, by the air flow.
Since the yarn is pulled toward the yarn supplying side, it is possible to pull the defective yarn while securely holding at least the immediately preceding normal weft yarn.

Another defective yarn removing method according to the present invention is a mechanical type weft yarn end for pullably holding the end portion of one or more repulsed weft yarns on the counter-feed side at the time of initial removal work of defective yarn. And removing the defective yarn while holding the holding device at the end portions of the plurality of weft yarns including the defective yarn on the side opposite to the yarn feeding side.

Another defective yarn removing device according to the present invention is a mechanical weft end holding device for holding the end portions of one or more weft yarns that have been beaten repulsively on the opposite side, and at least the initial stage of defective yarns. And a drive device for operating the weft yarn end holding device so as to hold the plurality of anti-feed yarn side end portions including the defective yarn so that they can be pulled out during the removing operation.

According to the other removing method and apparatus described above, the defective yarn can be pulled out at the end portion on the side opposite to the yarn feeding side and at least the end portion on the side opposite to the yarn feeding side of the normal weft yarn inserted immediately before the defective yarn. Since the yarn is mechanically held and pulled to the yarn supplying side, the defective yarn can be pulled while the immediately preceding normal weft yarn is reliably held.

In still another defective yarn removing method according to the present invention, a holding range is set in advance so as to remove the weft yarn that is discharged by the reverse rotation of the loom and to hold at least the opposite side end of the weft yarn immediately before the weft yarn. Activating the mechanical weft end retainer provided at least during the initial removal operation of the defective yarn.

In still another defective yarn removing device according to the present invention, the holding range is preset so as to remove the weft yarn that has been ejected by the reverse rotation of the loom and to hold at least the end portion of the weft yarn on the side opposite to the non-feeding side. A mechanical type weft end holding device, and a drive device for operating the weft end holding device at least during initial removal work of defective yarn.

According to the above still another removing method and apparatus, the defective yarn has a holding range in advance so that the end of the normal weft inserted immediately before the defective yarn does not grip the defective yarn. Since it is pulled to the yarn feeding side in a state where it is held by operating a predetermined mechanical gripping device, it is possible to pull a defective yarn in a state in which the immediately preceding normal weft is surely held.

Each of the above devices further includes a defective yarn pulling device that pulls the defective yarn toward the yarn supplying side, and the drive device operates the defective yarn pulling device when the defective yarn is removed. You can

The above-mentioned initial removal work can be performed until the defective yarn is separated from the cloth fell.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a defective yarn removing device 10 inserts a weft 12 into a warp opening together with a weft inserting fluid by a weft inserting nozzle 14, and removes a weft 16 that has been normally inserted. It is applied to a jet loom for weaving the woven fabric 18 by beating the reed with a reed. The weft yarn 16 is separated from the woven fabric 18 at an appropriate timing by a cutter (not shown).

The defective yarn removing device 10 includes a pneumatic weft end holding device 20 for holding the end portions of the plurality of repulsed weft yarns 16 on the side opposite to the yarn feeding side by suction, and pulling the defective yarn 22 to the yarn feeding side. Defective yarn pulling device 24 and weft end holding device 2
0 and a drive device 26 for driving the defective yarn suction device 24.

In the weft yarn end holding device 20, the defective yarn 22 is obtained by making a negative pressure by a suction means such as a suction type retainer such as a suction nozzle arranged on the opposite side of the woven fabric 18 from the woven fabric 18.
And a plurality of weft yarns 16 including the weft yarn 16 which has been properly weft-inserted and beaten immediately before the defective yarn 22, the end portion on the side opposite to the yarn feeding side is sucked and held by a suction type cage so as to be pulled out. Device.

The defective yarn pulling device 24 is an existing device for pulling the defective yarn 22 toward the yarn feeding side by the pulling nozzle by removing negative pressure of the pulling nozzle by the pulling means.

The drive device 26 supplies the drive signal S1 to the weft yarn end holding device 20 while the loom is operating normally, but the drive signal S is supplied when the loom is stopped except when the defective yarn 22 is being removed.
1 is not supplied to the weft end holding device 20 and the weft end holding device 2
Stop 0.

The driving device 26 also supplies the drive signal S1 to the weft end holding device 20 at least during the defective yarn initial removal operation, and further during the removal operation of the defective yarn 22, the drive signal S1.
2 is supplied to the traction device 24 to operate the traction device 24.

The drive device 26 is independent of the control device of the loom, and when the weaving device fails in weft insertion, a loom stop signal S3 is supplied from the control device of the loom. However, the drive device 26 may be common to the control device of the loom.

When a weft insertion failure occurs due to a long pick or a broken yarn, the loom stops. Prior to the start of the work of removing the defective yarn 22, the warp yarn opening is maximized and the reed is retracted to a predetermined position.

The work of removing the defective yarn 22 is started by pressing the inching button of the loom. When the inching button is pressed, the loom is inching, the warp shed is maximized, and the removal start command signal S3 is supplied to the drive unit 26. The removal start command signal S3 is generated by pressing the inching button or the removal start button.

When the removal start command signal S3 is input to the drive device 26 from the control device of the loom due to weft insertion failure, the drive device 26 causes the weft end holding device 20 and the defective yarn pulling device 24 to remove the defective yarn 22. Works as above.

Upon receiving the drive signal S1, the weft end holding device 20 receives, for example, the defective yarn 2 at least during the initial removal work.
It is actuated by the drive 26 until the 2 leaves the cloth fell. As a result, the plurality of weft yarns 16 including the weft yarn immediately before the defective yarn 22 is held by the weft end holding device 20 so as to be pulled out.

Further, the defective yarn pulling device 24 uses the drive signal S
When receiving 2, the defective yarn 22 starts to be pulled. As a result, the defective yarn 22 is pulled out to the yarn supplying side and removed.

When the defective yarn 22 is pulled out, the opposite side ends of the plurality of wefts 16 including the weft yarn immediately before the defective yarn 22 are held by the weft end holding device 20 by suction. There is no risk that the yarn side end will be pulled into the warp yarn opening as the defective yarn 22 is pulled.

Referring to FIG. 2, weft end holding device 20
Is a suction type retainer 30 such as a suction nozzle that sucks the ends of the plurality of weft yarns 16 and defective yarns 22 on the side opposite to the yarn feeding side, an ejector 32 connected to the suction type retainer, and a compression to the ejector 32. An air supply device 34 for supplying air and a discharge pipe 36 for discharging the air blown from the ejector 32 together with the weft ends are included.

In the weft yarn end holding device 20, the compressed air is supplied to the ejector 32 by the pipe 38 and discharged from the ejector 32 to the trash box through the discharge pipe 36. As a result, the suction type retainer 30 is made to have a negative pressure, and the ends of the plurality of weft yarns 16 and the defective yarn 22 are sucked by the suction type retainer 30.

In the illustrated example, the air supplier 34 receives compressed air from a compressed air source such as a compression pump in the manifold 40, and receives the compressed air received in the manifold 40 via two air supply passages 42 and 44. Supply to the pipe 38.

The air supply paths 42 and 44 are respectively provided with
Arranged are pressure regulators 46 and 48 for adjusting the pressure of the compressed air to different values, and solenoid valves 50 and 52 for selectively supplying the adjusted compressed air to the pipe 38. The pressure regulator 46 regulates the compressed air to a higher pressure than the pressure regulator 48.

When the loom is operating normally, the solenoid valve 5
0 is released, and high-pressure compressed air is supplied to the ejector 32. As a result, the weft yarn 16 is moved to the suction type cage 30.
It is surely sucked in and held securely. In contrast,
When removing the defective yarn, the solenoid valve 52 is opened and low-pressure compressed air is supplied to the ejector 32. As a result, the weft yarn 16 is sucked and held by the suction type holder 30.

The supply of compressed air to the ejector 32 is stopped by closing both solenoid valves 50 and 52 after the loom is stopped until the inching button or the removal start button is pressed, and the inching button or removal start. Solenoid valve 5 after the button is pressed
2 may be opened to start. Further, the electromagnetic valve 52 may be intermittently turned on / off during the period in which the compressed air should be supplied to the ejector 32. In either case, consumption of compressed air is suppressed.

However, the compressed air of the same pressure may be supplied to the ejector 32 without providing two compressed air supply system passages to the ejector 32. In that case, the pressure of the compressed air to the ejector 32 may be changed by the pressure regulator arranged in the compressed air supply system path during normal operation of the loom and during stoppage or defective thread removal work. Good. By doing so, consumption of compressed air can be suppressed.

The plurality of weft yarns 16 beaten and held by the suction type retainer 30 are separated from the woven fabric 18 by the cutter 54 at appropriate timing.

Referring to FIG. 3, a defective yarn removing device 60
Uses an existing weft end holding device 62 using a mechanical retainer that mechanically holds the end portion of the weft yarn 16 on the side opposite to the yarn feeding side.

The mechanical retainer of the weft end holding device 62 is arranged on the anti-feed side of the woven fabric 18 so as to receive the ends on the anti-feed side of the plurality of wefts 16, as shown in FIG. 4, for example. The base 64, an electric actuator 66 such as a solenoid or an electric motor, and a rod-shaped holding member 68 that is angularly rotated by the electric actuator 66 around an axis extending in the weft flight direction.

The holding member 68 is attached to the rotary shaft of the electric actuator 66 at the downstream end of the warp 70 in the moving direction so as to extend on the base 64 in the moving direction of the warp 70, and the end of the weft 16 is held. Is angularly rotated between a first position in which it is largely separated from the base 64 to receive the space between the base 64 and the holding member 68, and a second position in which the end of the weft thread 16 is held in cooperation with the base 64. It

In this weft end holding device 62, the holding member 68 is driven by the electric actuator 66 so as to alternately receive and hold the end portion of the weft 16 at appropriate timing during normal operation of the loom. By being driven by the device 26, it is displaced to the first and second positions at appropriate timing. As a result, the plurality of wefts 16 including the weft yarn immediately before the defective yarn 22 are received by the end portions thereof between the base 64 and the holding member 68 and held. The defective yarn 22 is also received at the end of the defective yarn 22 under the holding member 68.

During the work of removing the defective yarn 22, the holding member 6
8 is displaced to the first position at least until the initial removal work to securely hold the end portion of the weft thread 16 between the base 64 and the holding member 68, but the end of the defective thread 22 received below. No part is retained. However, since the end of the defective yarn 22 is located below the holding member 68, the end of the defective yarn 22 is held so that it can be pulled out.

At the time of removing the defective yarn, the defective yarn pulling device 24 is driven by the driving device 26 to start pulling the defective yarn 22. As a result, the defective yarn 22 is pulled out to the yarn supplying side and removed.

When the defective yarn is pulled out, since the end portions of the plurality of weft yarns 16 including the weft yarns immediately before it are pulled out by the weft yarn end holding device 62, the weft yarns 16 are not fed back. There is no risk that the yarn side end will be pulled into the warp yarn opening as the defective yarn 22 is pulled.

Instead of the mechanical retainer shown in FIG.
A mechanical retainer may be used like the weft end retaining device 72 shown in FIG.

In the mechanical retainer shown in FIG. 5, instead of the rod-shaped holding member 68, a holding member that is rotatably supported by one or more arms 74 around an axis extending in the flight direction of the weft 16 is used. The roller 76 is used. Arm 74
The electric actuator 66 is attached to the rotary shaft at the downstream end portion of the warp yarn 70 in the moving direction so as to extend in the moving direction of the warp yarn 70, and the roller 76 is supported at the upstream end portion.

In the weft end holding device 72, the roller 76
Operates similarly to the retaining member 68 in the embodiment shown in FIG.

For this reason, the roller 76 causes the electric actuator 66 to alternately receive and hold the end portion of the weft yarn 16 at appropriate timing during the normal operation of the loom.
Is driven by the driving device 26, and is displaced to the first and second positions at appropriate timing. As a result, the plurality of weft yarns 16 including the weft yarns immediately before the defective yarn 22 are received and held at their end portions between the base 64 and the roller 76. Defective yarn 22 also has roller 7 at its end.
Accepted under 6.

During the work of removing the defective yarn 22, the roller 76
Is displaced to the first position at least until the time of the initial removal work to securely hold the end portion of the weft yarn 16 between the base 64 and the roller 76, but the end portion of the defective yarn 22 received below is Do not hold. However, the end of the defective yarn 22 is held so that it can be pulled out because it is located below the roller 76.

At the time of removing the defective yarn, the defective yarn pulling device 52 is driven by the driving device 26 to start pulling the defective yarn 22. As a result, the defective yarn 22 is pulled out to the yarn supplying side and removed.

Also in the weft end holding device 72, when the defective yarn is pulled out, the plurality of weft yarns 1 including the weft yarn immediately before it are pulled out.
Since the ends on the side opposite to the yarn feeding side of 6 are held by the weft end holding device 72 so as to be pulled out, the ends on the side opposite the yarn feeding side of the wefts 16 are pulled into the warp shed as the defective yarn 22 is pulled. There is no fear.

Weft end holding device 62 using a mechanical holder
6 and 72, as shown in FIG. 6, the base 64 and the holding member 68 or 76 move the warp yarn so that the normal weft yarn 16 is surely held, but the defective yarn 22 is held so that it can be pulled out. The position in the direction can be adjusted in advance. In this case, the one or more weft yarns 16 are held by the holding members 68 and 76 at least during the initial removal operation, except for the defective yarn that has been ejected by the reverse rotation of the loom.

However, as shown in FIG. 7, the base 64 and the holding member 68 or 76 previously adjust the position in the moving direction of the warp so that the defective yarn 22 is held together with one or more normal wefts 16. You may keep it. In this case, the defective yarn 22 is held so that it can be pulled out.

In any of the above embodiments, the existing weft end holding devices 20, 62, 72 in the defective yarn removing devices 10, 60 are used.
However, like the defective yarn removing device 80 shown in FIG. 8, the defective yarn 22 is removed by using a weft end retaining device 82 which is different from the existing weft end retaining device 20 (or 60). It may be held together with one or more normal wefts 16 at times.

In the defective yarn removing device 80, the weft end holding device 80 is arranged between the weft end holding device 20 (or 60) which holds the weft end during weaving and the woven fabric 18. The existing weft end holding device 20 (or 60) is operated during normal operation of the loom, and the weft end holding device 82 is operated during at least the initial removal operation of defective yarn.

In each of the above embodiments, the defective yarn 22 is removed by the pulling device 24, but the defective yarn 22 may be removed manually.

The operation start timings of all the above weft end holding devices for the work of removing the defective yarn 22 can be determined as follows, for example.

The operation is started by pressing the inching button.

The reed is retreated by pressing the inching button, and when the reed is retracted to a predetermined angle, the holding is started.

Holding is started by pressing the operation button for the weft end holding device.

Holding is started by pressing a button other than the inching button and the operating button for the weft end holding device.

Holding is started by the sensing output of the sensor that senses that the worker approaches the loom.

Holding is started by the sensing output of the sensor that senses the defective yarn 22. This sensor is located on the flight path of the weft yarn and is arranged on the downstream side in the weft flight direction with respect to the position where the normal weft insertion position is reached.

Holding is started at the same time when the loom is stopped.

The operation end timing of the weft end holding device for the work of removing the defective yarn 22 can be determined as follows, for example.

Simultaneously with the start of the holding operation, the time measurement is started by a timer or the like, and the holding operation is ended when a predetermined time has passed.

The holding operation is terminated by pressing the release button for the weft end holding device.

The holding operation is terminated by pressing a button other than the inching button and the operation button for the weft end holding device.

When the sensor for detecting that the worker approaches the loom no longer detects the worker, the holding operation is ended.

The holding operation is ended when the weft thread detection sensor which has been normally inserted into the weft thread no longer senses the weft thread.

When the operation of the loom is restarted, the holding operation is ended.

As is clear from the above, the weft end holding device may be operated at least during the initial removal work.
Not only during initial removal work but also during long pick and shredded yarn removal work, during removal work of all types of defective yarns, during stoppage due to weft insertion failure, or regardless of the cause of stoppage. It may be operated during the stop of the.

The present invention is not limited to the above-mentioned embodiments, and can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a defective yarn removing device according to the present invention.

FIG. 2 is a diagram showing an embodiment of a weft yarn end holding device used in the defective yarn removing device shown in FIG.

FIG. 3 is a diagram showing a second embodiment of the defective yarn removing device according to the present invention.

FIG. 4 is a diagram showing an embodiment of a weft end holding device used in the defective yarn removing device shown in FIG.

5 is a diagram showing another embodiment of the weft end holding device used in the defective yarn removing device shown in FIG.

FIG. 6 is a view showing a weft holding state by a weft end holding device used in the defective yarn removing device shown in FIG. 3;

7 is a view showing another weft holding state by the weft end holding device used in the defective yarn removing device shown in FIG.

FIG. 8 is a view showing a third embodiment of the defective yarn removing device according to the present invention.

[Explanation of symbols]

10,60,80 defective yarn removing device 12 weft 14 Weft insertion nozzle 16 Wefts that have been properly inserted 18 woven cloth 20, 62, 72, 82 Weft end holding device 22 defective yarn 24 Bad yarn pulling device 30 suction type retainer 68,76 Mechanical cage

Claims (7)

[Claims] 1. At least during initial removal work of defective yarn,
A method for removing a defective yarn in a loom, comprising activating an air-type weft end holding device that holds, by suction, an end portion of one or more wefts that have been beaten beside each other by suction. 2. At least during the initial removal work of defective yarn,
While holding the non-feed side ends of a plurality of wefts including the defective yarn, a mechanical type weft end holding device that holds the non-feed side ends of one or more beaten beatings in a pullable manner. A method for removing a defective yarn in a loom, comprising removing the defective yarn. 3. A mechanical weft end holding device in which a holding range is set in advance so as to remove a weft yarn that has come out by the reverse rotation of a loom and to hold at least an end portion of the weft yarn immediately before the weft yarn on the opposite side. A method for removing a defective yarn in a loom, comprising operating the defective yarn at least during an initial removal operation. 4. An air-type weft end holding device for holding, by suction, an end portion of one or more beaten yarns that have been beaten beside each other by suction.
A defective yarn removing device in a loom, comprising: a drive device for operating the weft end holding device at least during an initial removal operation of the defective yarn. 5. A mechanical type weft end holding device which holds the anti-feeding side end of one or more beaten beatings so that it can be pulled out, and a plurality of wefts containing the defective yarn at least during initial removal work. A drive device for operating the weft yarn end holding device so as to hold the anti-feed yarn side end portion so that it can be pulled out.
A defective yarn removing device for a loom. 6. A mechanical type weft end holding device having a holding range set in advance so as to remove the weft yarn that has come out due to the reverse rotation of the loom and hold at least the end portion of the weft yarn on the side opposite to the weft yarn side. A defective yarn removing device in a loom, comprising: a drive device that is operated at least during an initial removal operation of the defective yarn. 7. The defective yarn pulling device for pulling the defective yarn toward the yarn supplying side, wherein the drive device operates the defective yarn pulling device when the defective yarn is removed.
Or the defective yarn removing device according to item 6.