JPH06184879A - Method for removing defective yarn - Google Patents

Abstract

PURPOSE:To accurately judge the success or failure of the removal of defective yarn in a defective yarn removing apparatus. CONSTITUTION:The rear end of guided defective yarn is held with a mechanical traction means when the swinging slay is almost passed through the most retreated position within the period from the start of guiding of the rear end of the defective yarn with the mechanical traction means to the pick finding of the defective yarn. As an alternative, the rear end of defective yarn is held with a holding means placed between a warp opening means and a mechanical traction means when the slay reaches nearly the most retreated position from the start of the guiding of the rear end of the defective yarn to the pick finding of the yarn. After the pick-finding, the defective yarn is held with the mechanical traction means and the holding of the defective yarn with the holding means is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for surely removing a defective yarn by a defective yarn removing device when a weft insertion defect occurs.

[0002]

2. Description of the Related Art As a defective yarn removing device, a full-fledged Shokai 62-4
There are devices disclosed in Japanese Patent No. 1083 and Japanese Utility Model Publication No. 4-14469.

In the former defective yarn removing device of Japanese Utility Model Laid-Open No. 62-41083, when a weft insertion defect is detected, a loom stop signal is output and a predetermined amount of weft yarn is released from the weft yarn length measuring and storing device. , A weft yarn connected to the defective yarn, that is, a rear end portion of the defective yarn, is guided through a yarn guide (yarn guide 7) provided in the sley to a fluid type guiding means (guide nozzle 2
And the blow nozzle 12) to guide to the mechanical pulling means (the winding body 9 and the rotating body 10), and after the loom is stopped, the loom is reversed and the defective yarn is discharged, and the trailing end of the defective yarn is pulled. The defective yarn is pulled while being held by. Then, before the elapse of a predetermined time from the start of pulling, when a yarn absence signal is detected by a sensor provided at the intake port of the defective yarn, it is determined that the removal such as defective yarn cutting has failed.

[0004]

[Problems of the above technique] According to the defective yarn removing apparatus, since the trailing end of the defective yarn is held by the pulling means after the exit, the determination of success or failure of the defective yarn removal becomes inaccurate. In detail, the defective yarn is discharged while operating the fluid guide means, and then the mechanical pulling means holds the defective yarn.Therefore, when the weft yarn is a filament or a strongly twisted yarn, during the reverse rotation of the loom, When the restraint by the warp yarn is released, the defective yarn may be pulled out from the warp yarn opening only by the pulling force of the fluid guide means. After that,
When the defective yarn is held by the mechanical pulling means and the pulling is started, the length of the defective yarn pulled by the pulling means is substantially shortened. Therefore, even if all the defective yarns are extracted from the opening, that is, even if the purpose of removing the defective yarns is achieved, the removal time becomes shorter than the predetermined time, and it is determined that the removal has failed. .

Further, in the latter defective yarn processing apparatus of Japanese Utility Model Publication No. 4-14469, the rear end portion of the defective yarn guided by the fluid guide means is held by the mechanical traction means before the reversing of the loom. In this state, the loom is reversed to eject the defective yarn, and after the ejection, the defective yarn is pulled and removed.

[0006]

[Problem] According to the defective yarn processing device, even if the defective yarn is pulled out from the warp yarn opening by the pulling force of the fluid guide means, the constraint of the weft yarn by the warp yarn is released.
The length of the defective yarn pulled out by the traction means does not change. However, during the reverse rotation of the loom, the swinging yarn guide may pull the defective yarn and cut the defective yarn between the warp yarn opening and the pulling means.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to accurately judge whether defective yarn is removed or not, and to reliably remove defective yarn.

[0008]

According to the present invention, the fluid guide means guides the trailing end of a defective yarn to a mechanical traction means through a yarn guide provided on a sley, and thereafter,
In the defective yarn removing device that reverses the loom to release the constraint of the defective yarn by the warp yarn, ejects the defective yarn and removes it while holding the defective yarn by the mechanical traction means. During reversal of the next cycle, when the sley is between approximately the last retracted position and the sley position when the restraint of the defective yarn by the warp yarn is released, the defective yarn guided by the mechanical traction means is The rear end of the sled is held, or holding means is provided between the warp thread opening and the mechanical traction means, and during the reversal of the next cycle following the cycle in which weft insertion failure has occurred, the sley is set to the almost last retracted position. To the sled position at the time when the restraint of the defective yarn by the warp yarn is released,
The rear end portion of the defective yarn is held by the holding means, and after the ejection, the mechanical pulling means holds the rear end portion of the defective yarn and releases the holding of the defective yarn by the holding means.

During the next cycle following the cycle in which the weft insertion failure has occurred, in other words, during the reverse rotation of the inertial operation cycle of the loom, when the sley is in the most retracted position,
The length of the rear end portion of the defective yarn from the cloth fell to the pulling means or the holding means becomes almost maximum. At this time, if the trailing end of the defective yarn is held by the pulling means or the holding means, even if the yarn guide swings together with the sley until the defective yarn comes out thereafter, the defective yarn is pulled by the yarn guide and cut. There is nothing to do.

Further, during the reverse rotation in the inertial operation cycle,
When the sley is in a position other than the most rearward retracted position from the position where the sley is almost last retracted to the sley position at which the restraint of the defective yarn by the warp yarn is released, the trailing end of the defective yarn is pulled by the pulling means or The trailing end of the defective yarn is not cut even if it is held by the holding means and the loom is reversely rotated until the defective yarn is discharged. In detail, the length of the rear end portion of the defective yarn from the cloth fell to the pulling means or the holding means is
It's shorter than when the sled is in its most retracted position. However, during the reversal after the holding, the distance from the cloth fell to the pulling means or the holding means via the thread guide exceeds the length of the trailing end of the defective yarn from the cloth fell to the pulling means or the holding means. Since the defective yarn is restrained by the warp yarn and the excess amount of the defective yarn is pulled out from the warp yarn opening, the trailing end of the defective yarn is not pulled by the yarn guide and cut. The time when the restraint of the defective yarn by the warp yarn is released, in other words, the rotation angle of the weaving machine spindle varies depending on the type of weft yarn or the movement mode of the shed, and is therefore set experimentally every time the condition is changed.

Further, when the defective yarn is pulled out, even if the defective yarn is pulled out by the pulling force of only the fluid guide means, the removal length of the defective yarn by the mechanical pulling means does not change. From the above, it is possible to accurately judge the success or failure of removal of the defective yarn without cutting the defective yarn at the time of the ejection.

[0012]

EXAMPLE 1 This example is shown in FIG. 1 to FIG. 4, and corresponds to claim 1, and at the same time when the weft insertion defect is detected, the weft yarn is unwound from the measuring and storing device and blown up to cause a defect. While avoiding yarn breakage, the loom is stopped at the last retracted position of the sley during the reverse rotation of the loom for feeding, and the trailing end of the defective yarn is held by the mechanical pulling means, and then the loom is reversed. This is an example of restarting.

1 and 2, the defective yarn removing device 1 of the present embodiment is similar to the device of Japanese Utility Model Laid-Open No. 62-41083 or Japanese Utility Model Publication No. 4-14469 in the basic configuration, The main nozzle 2 for weft insertion, the cutter 3 for cutting defective yarn, the blowing nozzle 4 for yarn guiding, and the yarn guide 5 are attached to, for example, the sley 6 or a reed 7 integral therewith. Here, the mechanical traction means is provided inside the defective yarn removing device 1 and is constituted by a pair of rotating bodies 19 and 20 which can be brought into contact with and separated from each other, and the fluid guide means is used for the blowing nozzle 4 or suction. The injection nozzle 18 or a combination thereof is used.

The weft thread 8 is supplied from a weft thread package (not shown), and a length required for one weft insertion or a weft thread length longer than one time is stored by a drum-type length measuring and storing device 9, for example. , The main nozzle 2 causes the opening 1 of the warp yarn 10 together with the jetting fluid.
The weft yarn 8 to be supplied next is laid in 1 and is driven by the reed 7 into the cloth cloth 13 of the woven fabric 12 and cut on the weft insertion side by the yarn supplying cutter 14.
Separate from. The normal weft insertion state is detected by the weft insertion sensor 15 on the arrival side of the weft thread 8.

In the weft insertion process, when a weft insertion failure occurs, the weft insertion sensor 15 detects the state, thereby generating a loom stop signal and sending it to a loom controller (not shown) to stop the loom. In addition, the defective yarn removing device 1 and the like are operated in preparation for the removal and removal of the defective yarn 81.

FIG. 3 shows the process from the occurrence of the weft insertion failure to the stop of the loom, together with the rotation angle and the open state of the loom. In the figure, a poor weft insertion cycle corresponds to one rotation of a weft insertion error, that is, a poor weft insertion, and the subsequent inertial operation cycle shows a rotation period in which the weaving machine is stopped due to a poor weft insertion.

When a weft insertion failure occurs in the weft insertion failure cycle, the state is detected by the weft insertion sensor 15 and a loom stop signal is output at about 290 degrees. Based on this, the loom enters the braking operation, After stopping at the primary stop position of 260 degrees in the next inertial operation cycle, reverse rotation operation is started, and the operation is temporarily stopped near 180 degrees of the inertial operation cycle, that is, the secondary stop position, and through the step of weft holding according to the present invention. The reverse rotation is restarted, and the defective yarn 81 is completely discharged at 180 degrees of the weft insertion defective cycle, that is, at the tertiary stop position of all openings, and the defective yarn 81 is stopped there. At this tertiary stop position, the defective yarn removing device 1 performs the defective yarn removing operation. After the removal operation is complete, the loom is reversed again, and in the cycle immediately preceding the poor wed insertion cycle, 320
After receiving the operation command after stopping at the fourth stop position,
From that position, it rotates in the forward direction and becomes a restart state.

Next, FIG. 4 shows the operating condition of each part from the time when the loom stop signal is generated to the third stop position and the fourth stop position through the primary stop position and the secondary stop position of the loom. ing. When the loom stop signal is generated, the loom operation contactor is set to the off state, and the locking pin 16 of the length measuring and storage device 9 is retracted, for example, twice by the solenoid 17, and the weft yarn 8 in the stored state is processed to remove the defective yarn. Release only the required length.

At the same time, the blowing nozzle 4 as fluid (air) guide means starts the blowing operation, and the suction nozzle 18 for sucking inside the defective yarn removing device 1 also starts the jet operation, whereby the mechanical type The casing 21 is provided between the pair of rotating bodies 19 and 20 forming the traction means.
An air flow in the pull-in direction is generated at the intake port 22 formed in the.

By these operations, the weft yarn 8 is kept connected to the defective yarn 81, and is out of the cutting area of the yarn feeding cutter 14 to be in the cutting avoidance state. Also defective yarn 8
The rear end portion of 1 enters into the hood 23 by the blow-up airflow from the blow-up nozzle 4, and passes through the intake port 22 by the suction airflow from the injection nozzle 18, and a pair of rotating bodies 19 and 20 constituting a mechanical pulling means. Is being guided between.

After the loom stops at the primary stop position 260 degrees of the inertial operation cycle, it reverses in response to a command from the loom reverse contactor and temporarily stops near the secondary stop position 180 degrees of the same cycle. During this stop, the mechanical pulling means, that is, the pair of rotating bodies 1 from the cloth fell 13 through the thread guide 5.
The length of the rear end portion of the defective yarn 81 reaching 9 and 20 is the maximum as seen in FIG.

Here, the holding cylinder 24 inside the defective yarn removing apparatus 1 operates to move one of the rotating bodies 19 forward to bring it into contact with the other rotating body 20. By abutting the pair of rotating bodies 19 and 20, the rear end portion of the defective yarn 81 is sandwiched and held between them. Around this time, the cutter 3 for cutting the defective yarn cuts the weft yarn 8 between the main nozzle 2 and the defective yarn removing device 1 by repeating a plurality of cutting operations, for example, twice, and the defective yarn 8 is cut.
1 is separated from the weft thread 8 in the main nozzle 2 and set in a removable state.

After that, the loom restarts the reverse rotation and stops at the third stop position 180 degrees of the weft insertion failure cycle to complete the exit of the defective yarn 81. At this point, the operation of the blowing nozzle 4 is stopped. It should be noted that at the latest, when the spout is completed or at the time of reverse rotation before reaching 180 degrees, the restraint of the defective yarn 81 by the warp yarn 10 is released, and by the pulling force of the blowing nozzle 4 before the withdrawal by the pair of rotating bodies 19, 20, the defective yarn 81 is removed. Even if 81 is pulled out from the opening 11, the defective yarn 81 does not pass through the take-in port 22 and is pulled out by the defective yarn removing device 1.
There is no change in the length of. Also, during the reverse rotation of the loom, the sled 6
At the same time, even if the yarn guide 5 swings, the held defective yarn 81 is not cut by the pulling force.

Next, at the tertiary stop position, when a predetermined time has passed since the loom was stopped, the suction injection nozzle 18
Is stopped, the winding motor 25 is activated by a command from the control unit 32, and the rotation of the winding motor 25 is performed via the cylindrical shaft 28 supported by the gears 26, 27 and the bearing 29. It is transmitted to 19, 20. Therefore, the pair of rotating bodies 19 and 20 are wound by the defective yarn 81 as mechanical pulling means, so that the defective yarn 8 is wound.
1 is pulled out from the opening 11.

Simultaneously with the start of this withdrawal operation, the monitoring circuit 30 detects, for example, the thread sensor 31 near the take-in port 22.
By detecting the presence of the defective yarn 81, the time required for the pulling operation is integrated. When the time required for winding has passed, the yarn sensor 31 confirms that the yarn is in a no-thread state, and the control unit 32 stops the motor 25 so that the third stop position is reached. The operation of removing the defective yarn 81 is completed.

At this point, the holding cylinder 24 retracts one of the rotating bodies 19 so that the wound defective yarn 81 is opened between the pair of rotating bodies 19 and 20. The defective yarn 81 in the wound state is caused by the pair of rotating bodies 19, 2
When opened between 0, the blow-up nozzle 4 and the jet nozzle 18 operate simultaneously, and the defective yarn 81 in the wound state passes through the inside of the cylindrical shaft 28 mainly by the airflow from the jet nozzle 18. It is discharged to the outside.

At the same time, the reversing contactor of the loom is turned on, and the loom is reversing again and reversing toward the fourth stop position. At the quaternary stop position, the loom stop signal is eliminated and instead the loom operating contactor is converted to an "H" level signal. After this, the loom is restarted automatically or by an external command, and the weaving movement is started again.

In the above embodiment, when the sley 6 reaches the final retracted position during the reverse rotation of the inertial operation cycle of the loom, the rear end of the defective yarn 81 is held by the mechanical pulling means. During the reversal of the inertial operation cycle of the loom, when the sley 6 is in any position between the last retracted position and the sley position at which the restraint of the defective yarn 81 by the warp yarn 10 is released, The rear end portion of 81 may be held by mechanical traction means.

For example, 2 in the defective weft insertion cycle.
When the constraint of the defective yarn 81 by the warp yarn 10 begins to be released when the loom is reversed to 40 degrees, if the beating motion curve has a sinusoidal waveform, it is 120 degrees during the reversal of the inertial operation cycle. Then, the sley 6 has moved to the same position as the sley position at the time when the restraint of the defective yarn 81 by the warp yarn 10 is released. Therefore, as shown in FIG. 6, during the reversal of the inertial operation cycle, 180 to 1
When it is within 20 degrees, for example, when it reaches 150 degrees, the loom is temporarily stopped to hold the trailing end of the defective yarn.

When the reversing of the loom is restarted, the distance from the cloth fell 13 through the yarn guide 5 to the mechanical traction means becomes gradually shorter while the inertial operation cycle is reversed, and the sley 6
Is the shortest when is the most advanced. Thereafter, the above distance gradually increases, and when it reaches 210 degrees, the above distance becomes equal to the length of the rear end portion of the defective yarn 81 from the cloth fell 13 to the mechanical pulling means, and thereafter, The above distance exceeds the length of the rear end portion of the defective yarn 81. But 2
Since the restraint of the defective yarn 81 by the warp yarn 10 is beginning to be released from 40 degrees, even if the rear end portion of the defective yarn 81 is pulled by the yarn guide 5, the defective yarn 81 is paid out from the opening 11 by that amount. The rear end of the defective yarn 81 will not be cut. In addition, it is desirable that the weft yarn 8 connected to the mechanical pulling means from the main nozzle 2 be cut by the defective yarn cutting cutter 3 when the rear end portion of the defective yarn 81 is held. Further, the defective yarn removing device applied to the present invention is not limited to that of the embodiment, and is a defective yarn removing device of a type in which the rear end portion of the defective yarn 81 is guided to the mechanical pulling means by the fluid guide means. Anything is good.

[Embodiment 2] This embodiment corresponds to claim 2,
As shown in FIG. 5, a holding means is provided between the opening 11 of the warp thread 10 and the mechanical pulling means, for example, in the thread guide 5.
The configuration is such that the defective yarn 81 can be held inside the yarn guide 5. Here, the holding means is composed of a holding body 34 and a solenoid 33 as a drive source thereof.

While the loom is rotating in the reverse direction from the primary stop position,
When the sley 6 reaches the final retracted position in the inertial operation cycle, the solenoid 33 operates in the reverse rotation continuing state,
The holding body 34 holds the rear end portion of the defective yarn 81.
At this time, the defective yarn 81 from the cloth fell 13 to the holding body 34
The length of the rear end is maximum. At this time, the cutter 3 for cutting the defective yarn does not operate.

When the ejection of the defective yarn 81 is completed, that is, when the loom is stopped at 180 degrees of the defective weft insertion cycle, the jetting operation of the blowing nozzle 4 is stopped. next,
The mechanical pulling means holds the rear end portion of the defective yarn 81, and the holding body 34 releases the holding. After that, the suction injection nozzle 18 is stopped, and after the cutter 3 is operated, the removal operation is started and the removal time is monitored in the same manner as in the first embodiment.

Note that this embodiment can be modified in the same manner as in the first embodiment. That is, during the reversal of the inertial operation cycle, the sley 6 is located at a position other than the most retracted position from the most retracted position to the sley position when the restraint of the defective yarn 81 by the warp yarn 10 is released. At this time, the rear end portion of the defective yarn 81 is held by the holding means, and after the defective yarn 81 is exposed, the mechanical pulling means holds the defective yarn 81 and releases the holding of the defective yarn 81 by the holding means. Good.

[0034]

Other Embodiments During the reverse rotation of the loom, the defective yarn 81 is the warp yarn 10
Immediately before starting to be released from the restraint by the machine, the rear end portion of the defective yarn 81 is, for example, 250 degrees immediately before the rotation angle of the weaving machine spindle reaches 240 degrees in the weft insertion failure cycle, for example, 250 degrees, depending on the type of the weft insertion. May be held. According to this method, the swinging range of the sley 6 from the holding of the defective yarn 81 to the completion of the ejection is small, and the defective yarn 81 in the held state is less likely to be pulled by the yarn guide 5 and cut. The goal can be achieved to some extent.

[0035]

According to the present invention, even if the rear end of the defective yarn is held by the mechanical traction means or the holding means, the defective yarn can be pulled by the yarn guide during reverse rotation and cut. Therefore, in the process of removing the defective yarn, it is possible to prevent the accident of cutting the defective yarn, and when the constraint of the defective yarn by the warp yarn is released, the defective yarn is pulled out by the pulling force of only the fluid guide means. However, the removal length of the defective yarn by the mechanical traction means does not change. Therefore, the defective yarn is not cut when the yarn is picked out, and the success / failure of removing the defective yarn can be accurately determined.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a defective yarn removing device.

FIG. 2 is a side view of a mounting portion of a thread guide.

FIG. 3 is an explanatory diagram of a rotating condition of the loom during a poor weft insertion cycle and an inertial operation cycle.

FIG. 4 is a time chart diagram during a defective yarn removing operation.

FIG. 5 is a side view of components of a holding body.

FIG. 6 is a time chart diagram during a defective yarn removing operation.

[Explanation of symbols]

 1 defective yarn removing device 4 blowing nozzle as fluid guide means 5 yarn guide 6 sley 8 weft yarn 81 defective yarn 9 length measuring storage device 13 weaving cloth 15 weft insertion sensor 18 injection nozzle 19 as fluid type guide device 20 as a mechanical pulling means 31 as a mechanical pulling means thread sensor 34 holding body

Claims (2)

[Claims] 1. A fluid guide means guides a trailing end portion of a defective yarn to a mechanical traction means through a yarn guide provided on a sley, and then a loom is released to release the restraint of the defective yarn by the warp yarn. In the defective yarn removing device that reverses and outputs the defective yarn while the mechanical pulling device holds and removes the defective yarn, the sley is almost finished during the reversal of the cycle next to the cycle in which the weft insertion failure occurs. A defect characterized by holding the trailing end portion of the defective yarn in the guiding state by the mechanical traction means when it is between the retracted position and the sled position at the time when the constraint of the defective yarn by the warp yarn is released. Thread removal method. 2. The fluid type guiding means guides the rear end portion of the defective yarn to the mechanical traction means through a yarn guide provided on the sley, and then the weaving machine is reversely rotated so that the defective yarn is discharged. In the defective yarn removing device in which the mechanical pulling means removes the defective yarn while holding it, a holding means is provided between the warp yarn opening and the mechanical pulling means,
During the reverse rotation of the next cycle following the cycle in which a weft insertion failure occurs, the above-mentioned holding is performed when the sley is between almost the last retracted position and the sley position at the time when the above-mentioned warp yarn restraint of the defective yarn is released. Means for holding the rear end portion of the defective yarn by means of the means, and after the ejection, the mechanical pulling means holds the rear end portion of the defective yarn and releases the holding of the defective yarn by the holding means. .