JPH11107133A - Removal of defective yarn in shuttleless loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the practice of sure removal of a defective yarn while reducing the length of a weft yarn required for yarn treatment in removing the defective yarn caused by a mispick in a shuttleless loom. SOLUTION: A weft yarn 3 connecting from a picking nozzle 9 to a winding drum 18 is cut after a time when a wrapping amount attains so as to provide the higher wrapping resistance of the wrapped weft yarn 3 to the winding drum 18 than the withdrawing resistance of a defective yarn 3a from the interior of a shed 11 of warp yarns 10 after starting the winding with the winding drum 18, and the winding of the defective yarn 3a by the rotation of the winding drum 18 is then continued in a shuttleless loom 1, equipped with a defective yarn removing device 2 having a rotatable winding drum 18 and a wrapping pin 19 installed at a prescribed position on the peripheral surface of the winding drum 18 and capable of engaging the wrapping pin 19 with the weft yarn 3 connecting from the tip of the picking nozzle 9 to the end of a woven fabric on the yarn feed end at the time of causing a mispick, wrapping the weft yarn 3 around the peripheral surface of the winding drum 18 by the rotation of the winding drum 18 and thereby pulling and removing the defective yarn 3a connecting from the interior of the shed 11 of warp yarns 10 to the weft yarn 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a defective weft yarn, that is, a defective yarn from a warp yarn opening when a defective weft insertion occurs in a defective yarn removing device of a shuttleless loom.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 8-11855 discloses an apparatus for removing defective yarns caused by weft insertion errors. The removing device guides the defective yarn to the inside of the removing device by the air flow by the blowing operation of the guide nozzle arranged near the tip of the weft insertion nozzle and the suction action of the removing device, and the inside of the removing device becomes defective. After grasping the yarn, the weft is cut at a portion from the removing device to the weft insertion nozzle, and then the defective yarn is removed from the inside of the warp opening by a pulling action of the defective yarn by the removing device.

[0003] According to the above technique, by the action of the air flow,
Since the weft is guided to the inside of the removing device, the reliability is poor, and a weft holding error occurs inside the device, so that the defective yarn cannot be reliably removed. In particular, when the shuttleless loom is provided with a plurality of weft insertion nozzles to perform multicolor weft insertion, all the weft yarns are removed from the interior of the removal device from the positional relationship between the weft insertion nozzles and the guide nozzles. It is difficult to provide accurate guidance, and errors are likely to occur.

Japanese Patent Publication No. 6-63161 discloses a device for removing defective yarns. The removing device rotates the winding drum, catches the defective yarn with a winding pin, winds the defective yarn together with the weft connected to the weft insertion nozzle from the storage device around the outer circumferential groove of the winding drum, and places the defective yarn in the opening. Tow and remove.

[0005] In the above-described removing device, after all the defective yarns in the opening of the warp have been wound, the weft connected to the weft insertion nozzle is cut and processed together with the wound yarn. For this reason, at the time of winding the defective yarn, the weft connected to the weft insertion nozzle from the length measuring storage device is also wound and discarded by the same length as the defective yarn, that is, by one pick. As a result, the length of the weft yarn for the yarn processing becomes longer, and the consumption amount of the weft yarn increases with the process of removing the defective yarn.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shuttleless loom for reliably removing a defective yarn while reducing the length of the weft required for yarn processing when removing a defective yarn due to a poor weft insertion. Is to be done.

[0007]

According to the above object, the present invention comprises a rotatable winding drum, and a winding pin provided at a predetermined position on a peripheral surface of the winding drum, and when a weft insertion defect occurs, the rotation of the winding drum is reduced. A winding pin is engaged with the weft connected to the yarn end on the yarn supply side from the tip of the feed nozzle, and the winding drum rotates to wind the weft on the circumferential surface of the winding drum. In a shuttleless loom equipped with a defective yarn removing device that pulls and removes consecutive defective yarns,
After the start of winding by the winding drum, from the time when the winding resistance of the wound weft to the winding drum reaches the winding amount that is larger than the resistance of pulling out the defective yarn from the opening of the warp, the weft insertion nozzle starts. By cutting the weft connected to the winding drum and then continuing to wind the defective yarn by rotating the winding drum,
Since the weft is reliably guided to the take-up drum by catching with the winding pin, the weft connected to the take-up drum from the weft insertion nozzle is cut at the beginning of winding,
The consumption of weft on the nozzle side during yarn processing is minimized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a shuttleless loom 1 of an air injection type.
And a defective yarn removing device 2. In the shuttleless loom 1, the weft 3 is supplied from the yarn feeder 4, is locked on the outer peripheral surface of the drum 6 of the length measuring and storing device 5 by the locking pin 7, and is rotated once by the rotation of the rotation guide 8. The length required for weft insertion is measured and stored until the weft insertion timing. At the weft insertion timing, when the locking pin 7 unwinds the weft 3 in the length measuring and storing state on the drum 6, the weft insertion nozzle 9 ejects air to cause the weft 3 guided inside to be warp. The weft is inserted into the inside of the opening 11. After this weft insertion, the reed 12 drives the inserted weft yarn 3 into the weave front 14 of the woven fabric 13 by a beating motion.
Thereafter, the weft yarn 3 is fed to the weaving end on the yarn feeding side by the yarn feeding cutter 15.
To separate from the weft yarn 3 inside the weft insertion nozzle 9.

In the weft insertion process, the quality of the weft insertion is detected by the feeler 16 at the end of the woven fabric on the non-yarn feeding side. When a weft insertion failure such as a bend pick or a show topic occurs, the feeler 16 cannot detect the leading end of the weft yarn 3 and generates a weft insertion failure signal and sends it to the loom controller 40. The loom control device 40 operates the blowing nozzle 17 as a means for preventing the cutting of the weft 3 at the time of receiving the signal of the poor weft insertion, removes the weft 3 from the cutting area of the yarn feeding cutter 15, and According to the yarn feed cutter 15
Is set to a non-operational state. As a result, the weft 3 related to the poor weft insertion, that is, the defective yarn 3a, is still connected to the weft 3 inside the weft insertion nozzle 9. Thereafter, the loom control device 40 controls the operation necessary for extracting the defective yarn 3a and gives an operation command to the defective yarn removing device 2.

The defective yarn removing device 2 is movably supported by a guide driving means (not shown) between a standby position A and a drawing position B near the weft insertion nozzle 9.
A winding drum 18 for winding the weft 3 and the defective yarn 3a; a winding pin 19 for drawing the weft 3; and a drive motor 20 for driving the winding drum 18
It has. The wound defective thread 3 a enters from the suction mouth 21 by the suction action of the ejector nozzle 22 and is housed inside the cleaner case 23.

FIG. 2 shows an example of the configuration of the defective yarn removing device 2. As shown in FIG. The winding drum 18 has a plurality of drum wires 39 for winding the yarn at predetermined intervals in the axial direction along the outer peripheral surface, and has two bearings 25 at the center position,
It is rotatably supported by a lock nut 26 with respect to an output shaft 27 of the drive motor 20, and accommodates a cutter bracket 28 and a spring 29 therein, and a cutter 30 in an axial slit space near the groove 24. It has.

The cutter bracket 28 is supported by a cylindrical bearing portion so as to be rotatable with respect to the output shaft 27 and movable in the axial direction, and a spring 29 provided between the cutter bracket 28 and the bearing 25. Urged by the compression force of Cam follower 3 integrated with cutter bracket 28
Reference numeral 4 is in contact with a stepped cam slope of a cylindrical cam 38 fixed to the output shaft 27 by press fitting or the like.

The cutter 30 includes a fixed blade 31 fixed to the winding drum 18 in a slit space of the winding drum 18 and a movable blade 32 movable with respect to the fixed blade 31. The movable blade 32 is connected to the cutter bracket 28 by a pin 35. Further, the ratchet wheel 33 meshes with the ratchet 37 with the teeth on the outer periphery and allows the rotation of the winding drum 18 in the normal rotation direction. However, when the winding drum 18 rotates in the reverse direction, the ratchet wheel 33 engages with the ratchet 37, and Prevent reversal. The ratchet 37 is rotatably mounted on the winding drum 18, and the ratchet wheel 33 is fixed to a bracket 36 for mounting the drive motor 20.

As described above, the cam follower 3
4 is in contact with the stepped cam slope of the cylindrical cam 38. Here, the cam follower 34 and the cam 38 constitute a type of meshing clutch, and the rotation of the output shaft 27 of the drive motor 20 in the normal rotation direction is wound by the contact between the cam follower 34 and the stepped portion of the cam slope. When the output shaft 27 is rotated in the reverse direction, the cutter blade 28 is pressed against the spring 29 by the cam slope when the output shaft 27 rotates in the reverse direction, so that the movable blade 32 of the cutter 30 is moved to perform a cutting operation.

The winding pin 19 is provided on the winding drum 18 at the groove 24 in the radial direction, and has a length protruding from the outer peripheral surface of the winding drum 18.

FIG. 3 shows the operation sequence of the shuttleless loom 1 and the operation sequence of the defective yarn removing device 2 when a weft insertion failure occurs, as steps 1, 2,... Weft insertion feeler 1
When the weft insertion failure is detected by step 6, the loom controller 40 moves the locking pin 7 back and forth as step 1
After unwinding one turn of the weft yarn 3 necessary for yarn processing on the outer peripheral surface of the drum 6, the blow-up nozzle 17 is turned on, and if necessary, the yarn supply cutter 15 is turned off.
Thereby, on the yarn supply side, the weft yarn 3
It is in a state of being blown up by the airflow from 7,
The yarn is not cut by the yarn supplying cutter 15 and remains in a state of being connected to the defective yarn 3a.

After a weft insertion failure is detected, step 2
Then, the loom controller 40 starts the control for stopping the shuttleless loom 1, but the shuttleless loom 1 does not stop in the weft insertion cycle in which the weft insertion failure occurs due to the inertia of the rotating system, and In the weft insertion cycle, the vehicle is completely stopped without weft insertion.

In steps 3 and 4, the loom control device 40
By automatically reversing the shuttleless loom 1 from the crank angle of 270 degrees and finally stopping at 180 degrees, the defective yarn 3a is put out, the blowing nozzle 17 is turned off, and the weft insertion nozzle 9 is replaced. In addition, among the sub-nozzles (not shown) provided along the opening 11 as necessary, the sub-nozzles of a group close to the yarn supply side are set to the ejection state. Of course, the warp yarn 10 is in the state of the maximum opening, and is in a state where the defective yarn 3a can be easily pulled out from the opening 11. At this time, the weft 3 blown up by the blow-up nozzle 17 is inserted into the opening 11 of the warp 10. With this insertion, the defective yarn 3a is sequentially pulled away from the pre-weaving (weaving opening) 14. In this manner, the weft yarn 3 connected to the weft insertion nozzle 9 becomes linear by the air injection of the weft insertion nozzle 9 and the sub-nozzle inside the opening 11 of the warp yarn 10 and separates from the weaving front 14.

In step 5, the defective yarn removing device 2 moves from the standby position A to the pull-in position B. Here, the loom control device 40 rotates the drive motor 20 in the normal rotation direction, and rotates the winding drum 18 in the winding direction.
During this rotation, the winding pin 19 locks the weft yarn 3 between the weft insertion nozzle 9 and the weft insertion side weave end of the woven fabric 13, pulls it in the direction of the winding drum 18, and winds the weft 3. The drum 18 is wound.

In step 6, the defective yarn removing device 2 returns to the standby position A. During this time, the drive motor 20 further makes one rotation in the winding direction, and further turns the winding drum 18 one more time.
Rotate. As a result, the weft yarn 3 and the defective yarn 3a connected to the weft yarn 3 are wound around the winding drum 18 and are held firmly. Accordingly, in this holding state, the winding resistance of the weft 3 wound on the winding drum 18 with respect to the winding drum 18 is equal to the warp 10.
Has reached a winding amount that is larger than the resistance when pulling out the defective yarn 3a from the opening 11 of the second embodiment.

In step 7, the loom control device 40 rotates the shuttleless loom 1 forward, and in step 8 unwinds the weft 3 for one turn by one reciprocation of the locking pin 7. Then, the sub-nozzles of the first group are jetted, and the weft yarns 3 connected to the weft insertion nozzles 9 face the cutting area of the yarn feeding cutter 15. In step 9, the shuttleless loom 1 stops completely at a crank angle of 320 degrees for a mechanical cutter and at 50 degrees for an electric cutter.

In step 10, the yarn feeding cutter 15 cuts the weft yarn 3 connected to the defective yarn removing device 2 from the weft insertion nozzle 9 near the tip of the weft insertion nozzle 9. Therefore, in the subsequent extraction of the defective yarn 3a, the weft yarn 3 inside the weft insertion nozzle 9 is no longer pulled out and is no longer consumed.

In steps 11 and 12, the shuttleless loom 1 automatically reverses and stops at a crank angle of 180 degrees. In step 13, the drive motor 2 is removed to remove the defective yarn 3a.
No. 0 drives the winding drum 18 in the winding direction, thereby winding the defective yarn 3 a around the outer periphery of the drum wire 39 of the winding drum 18. The rotation of the drive motor 20 in the normal rotation direction at this time is transmitted to the winding drum 18 via the output shaft 27 by the cam follower 34 and the cam 38 having a clutch function. The transmission torque at this time must be larger than the pullout resistance for pulling out the defective yarn 3a from the inside of the opening 11. Thereafter, the ejector nozzle 22 is turned on, and the suction mouth 21 generates an airflow in the suction direction.

In step 14, the defective yarn 3 in the wound state
To discharge a, the drive motor 20 rotates in the reverse direction. At this time, the engagement between the ratchet wheel 33 and the ratchet 37 causes the winding drum 18 to be in a detent state in the reverse rotation direction. Therefore, the output shaft 27
The rotational force in the reverse direction moves the cam follower 34 rightward in FIG. 2 by the cam slope of the cam 38 and moves the movable blade 32 in the same direction via the cutter bracket 28.
At this time, the defective thread 3 a wound around the groove 24 of the winding drum 18 is cut by the movement of the movable blade 32 with respect to the fixed blade 31, and becomes detachable from the groove 24. The flow enters the inside of the cleaner case, is accelerated by the ejector nozzle 22, and is housed in the cleaner case 23.

The shuttleless loom 1 automatically reverses in step 15, and in step 16 the crank angle 3 for restarting.
Stop at 20 degrees. In the following step 17, the shuttleless loom 1
Is set to a restart state by manual operation of the operator or by an automatic start command from the loom control device 40. The winding completion state is determined by detecting a predetermined number of revolutions of the winding drum 18 or detecting the presence or absence of the defective yarn 3a between the defective yarn removing device 2 and the weft insertion side woven end of the woven fabric 13. It is determined by

In the above example, the defective yarn removing device 2 is made movable, and only when a weft insertion defect occurs, the pull-in position B
However, the defective yarn removing device 2 may be fixed at a position for the removing operation. In the case of the mobile type, the moving direction is not limited to the vertical direction, but may be any direction.

In the above-described embodiment, the cutting of the weft 3 inserted by the blow-up nozzle 17 is prevented by using the mechanical yarn feeding cutter 15, but an electric cutter is used instead. May be prevented from being electrically operated, thereby preventing cutting of the weft 3.

Further, in the above embodiment, the weft yarn 3 connected to the weft insertion nozzle 9 from the winding drum 18 is cut by the yarn feed cutter 15, but a dedicated cutter different from the yarn feed cutter 15 is provided. , So that it may be cut.

Further, the ejector nozzle 22 may be operated during the continuous winding. This allows
The fly waste accumulated on the winding drum 18 can be removed, thereby preventing the built-in cutter 30 from being inoperative.

In the process of pulling the defective yarn 3a, the defective yarn 3
a to prevent the defective yarn 3a or the warp 10 being pulled from being entangled with the warp 10 or the catch cord.
Means for detecting the tension of the defective yarn 3a during pulling may be provided, and the winding operation may be stopped when the tension higher than the set value is applied. Further, it is preferable that the drive motor 20 for rotatingly driving the winding drum 18 is controlled in accordance with the type of the weft 3 to be used, and is driven under appropriate acceleration and speed.

[0031]

According to the present invention, the following effects can be obtained.
After the occurrence of the weft insertion failure, the defective yarn is caught by the winding pins of the defective yarn removing device, wound up by the winding drum, and reliably pulled. In addition, after the start of winding, the winding amount of the defective yarn is a state in which the weft is held on the winding drum, that is, the winding resistance of the weft generated by the winding of the defective yarn on the winding drum is reduced by the warp. When the state of the winding amount that is greater than the withdrawal resistance when pulling out from the opening is reached, the weft connected to the weft insertion nozzle is cut off, so that the weft is pulled out from the weft insertion nozzle side It is possible to minimize the length of the weft necessary for the defective yarn removing process without being wasted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part of a shuttleless loom and a defective yarn removing device.

FIG. 2 is a sectional view of a main part of the defective yarn removing device.

FIG. 3 is an explanatory diagram of an operation of a shuttleless loom and an operation sequence of a defective yarn removing device during a defective yarn removing operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shuttleless loom 2 Defective yarn removing device 3 Weft yarn 3a Defective yarn 4 Feeder 5 Measurement storage device 6 Drum 7 Lock pin 8 Rotation guide 9 Weft insertion nozzle 10 Warp 11 Opening 12 Reed 13 Woven cloth 14 Feeding 15 Thread cutter 16 Filler 17 Blow-up nozzle 18 Winding drum 19 Winding pin 20 Drive motor 21 Suction mouse 22 Ejector nozzle 23 Cleaner case 24 Groove 25 Bearing 26 Lock nut 27 Output shaft 28 Cutter bracket 29 Spring 30 Cutter 31 Fixed blade 32 Movable blade 33 Ratchet wheel 34 Cam follower 35 Pin 36 Bracket 37 Ratchet 38 Cam 39 Drum wire 40 Loom control device

Claims (1)

[Claims] 1. A weaving winding drum, and a winding pin provided at a predetermined position on a peripheral surface of the winding drum. A yarn removing device that engages a winding pin with a weft connected to a winding yarn and rotates the winding drum to wind the weft around the winding drum, thereby pulling and removing a defective yarn connected to the weft from the opening of the warp. In the shuttleless loom equipped with the above, after the winding by the winding drum is started, the winding resistance of the wound weft to the winding drum reaches a winding amount that is larger than the resistance to pull out the defective yarn from the opening of the warp. After the point in time, cut the weft connected to the winding drum from the weft insertion nozzle, and then continue winding the defective yarn by rotating the winding drum. Defective yarn removing method in a shuttleless loom for.