JPS6147851A - Automatic drawing-off apparatus of inferior weft yarn of loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for automatically removing defective weft yarns in a loom, and more specifically, in a fluid jet loom, the present invention relates to a device for automatically removing defective weft threads in a loom. When a weft insertion failure occurs and the loom stops operating, the weft that was incompletely inserted next to the defective weft due to the defective weft and the inertia of the loom (hereinafter referred to as the "next yarn") The invention relates to a device for completely and automatically extracting water from a shed.

Several techniques have already been proposed for automatically pulling out part of the defective weft yarns from the shed when a loom stops operating due to defective weft insertion. The device disclosed in Japanese Patent Application Laid-Open No. 58-220856 is one example of this device, in which the ti
As a result, some of the defective weft yarns are pulled out from the shed upward in the warp line.

The present applicant has also proposed some automatic drawing devices (application number not yet determined), in which a part of the defective weft is caught by one or two drawing needles that swing up and down. It is pulled upward from the mouth.

However, the automatic devices proposed in these proposals are only involved in the process of pulling out part of the defective weft from the shed upward in the warp line, and are not involved in processing other parts of the defective weft that remain in the shed. Moreover, in order to pull out a defective weft, it is necessary to pull out the next yarn first, but in these conventional proposals, the next yarn is pulled out manually or by a separate device. There is. As a result, the automation of repair work for defective weft insertion becomes incomplete and the system configuration becomes complicated.

(Purpose of the invention) An object of the present invention is to continuously extract the next yarn and the defective weft yarn from the shed, which is the main part of the repair work for defective weft insertion, using a single device.

(Basic Structure of the Invention) The structure of the present invention is centered on a pair of weft pullback rollers, a first fixed suction pipe, and a second movable suction pipe, and is capable of generating a weft insertion defect detection signal. Accordingly, the gripper is opened and the cutter is inactivated, and the next yarn and the defective weft are pulled back by the pull-back roller and sucked into the suction tube of I81, and when both yarns are completely pulled out, the second yarn is transferred to the second suction tube. In a working position pointing toward the main nozzle, the pulled-back weft yarn stored in the first suction pipe is taken off via the main nozzle.

(Embodiment) What is shown in FIG. 1 is a weft supply section incorporating an example of the automatic defective weft extraction device of the present invention.

First, the known parts will be briefly explained. The weft yarn on the yarn donor body 1 is pulled out by the supply roller 2, stored in the storage device 3, and then inserted into the shed by the main nozzle N through the gripper 4 which is open at the timing of weft insertion. After beating with a reed, it is cut by cutter 〇.

Next, the device of the present invention incorporated in such a weft supply section will be explained. An upper pullback roller 12 is firmly fitted to a shaft 11 which is supported by a frame (not shown) between the storage device 3 and the gripper 4, and is operatively connected to a torque motor 13 via a pulley and a belt. An L-shaped lever 16 is rotatably supported at the top corner of a pin 14 that is also fixed to the frame, and a lower pull-back roller 17 rotates at its upper end in a position that allows its peripheral surface to engage with the upper pull-back roller 12. The lower end is freely connected to the tip of the plunger 18a of the first solenoid 18. Therefore, when the plunger 18a advances due to the action of the solenoid 18, the lower retraction roller 17
is shown spaced apart from the upper pullback roller 12), and when the plunger 18a retracts, the lower pullback roller 17 presses the circumferential surface of the upper pullback roller 12.

These pull-back rollers 12.17 are provided slightly upstream of the above-mentioned gripper 4, and are arranged so as to clamp the weft yarn when in a press-contact state. A first suction tube 19 is provided in an open manner.

Pin 2 fixed to the frame on the side of cutter 〇
1 has a lever 22 supported almost horizontally (it does not necessarily have to be horizontal), and a lever 22 is mounted on one end near the cloth.
A suction tube 23 is fixed. This suction tube 23 is connected to an appropriate suction source by a flexible hose 24 or the like so that its position can be changed. The other end of the lever 22 is freely connected to the tip of a plunger 26a of a second solenoid 26. Therefore, when the plunger 26a advances due to the plowing of the solenoid 26, the second suction pipe 23
is placed in the standby position shown in the figure, and when the plunger 26a is retracted, the main nozzle N? aMf, is placed in the active position of <. Furthermore, an optical yarn detector 27 consisting of a light emitter and a light receiver sandwiching the weft thread flight path is provided slightly in front of the main nozzle N.

Next, the operation of the apparatus of the present invention will be explained with reference to FIGS. 2(A) to 2(C).

First, each part of the apparatus performs various time-differentiated operations in response to generation of a weft insertion defect detection signal, and these operations are appropriately controlled using known timers, delay circuits, and the like.

Further, in this invention, it is assumed that the cutter C becomes inactive when a weft insertion failure occurs, but various methods can be considered for this.For example, the cutter is configured to be driven by a solenoid, The circuit that connects the solenoid to the power source may be temporarily opened in response to the occurrence of a failure detection signal, or the cutter C may be connected to the cam by a link, and the cutter 〇 may be closed by the bottom of the cam. , the link may be temporarily locked in response to generation of the weft insertion defect detection signal.

In any case, the defective weft W is not cut, so the next thread W
', and the next thread W' that is connected to the main nozzle N is the second thread W'.
As shown in Figure (A), the loom stops operating while remaining in the shed in a substantially U-shape.

After that, the first solenoid 18 is activated in response to the weft insertion defect detection signal.
is driven to raise the lower pullback roller 17 and bring the upper pullback roller 12 and the peripheral surface into pressure contact. In this state, the torque motor 13 is started, and the weft W is pulled back by the pressure rotation of the pull-back roller 12.17, and the suction pipe 19 of it sucks the pulled-back amount. Therefore, the next yarn W' in the shed is pulled out one after another, and eventually all are pulled out, so that the defective weft yarn W is directly connected to the main nozzle N as shown in FIG. 2(B). However, at this timing, the defective weft W is still restrained by the warp row T and cannot be pulled out. Therefore, tension is generated in the weft held by the pullback rollers 12 and 17, and this tension is sensed and the torque motor 13 will stop operating. A normal feedback control method may be used for this purpose.

At the timing when the pull-back rollers 12 and 17 stop rotating, the loom is reversed one rotation, and the defective weft W is released from the restraint of the warp row. That is, the picking of the defective weft W is completed.

When the picking is completed, the torque motor 13 is started again, the pull-back roller 12.17 rotates, and the defective wefts W in the shed are pulled out one after another, until all of them are pulled out as shown in FIG. 2(C). When the tip of the weft yarn tries to enter the main nozzle N, the detector 27 detects this, and the torque motor 1 is activated in accordance with the detection signal.
3 stops operation, and the first solenoid 18 operates, and the lower pull-back roller 17 separates from the upper pull-back roller 12 to release the weft yarn. At the same time, the suction of the first suction tube 19 is stopped.

At this timing, the loom is reversed one more time, and the normal weft is taken out.Next, the lever 22 is rotated by the action of the second solenoid 26, and the second suction pipe 23 is moved to the operating position, that is, its suction port is the main The weft yarn is transferred to the injection port of the nozzle N and suctioned from inside the main nozzle N. At the same time, pressure fluid is injected from the main nozzle N, and the weft yarn that was previously pulled back and accommodated in the first suction tube 19 is transferred to the second suction tube 2.
Released within 3 days. When this discharge is completed, the second suction tube 23 is returned to the standby position shown in FIG.

In this state, the main nozzle N and the suction tube 23 of ft52 are connected by the weft. However, when the operation of the loom is resumed, the cutter C operates before the first weft insertion, and this connection is severed, so that there is no problem with subsequent weaving.

(Effects of the Invention) According to this invention, it is possible to successively remove the next yarn and defective weft yarn using a single device, which greatly contributes to the simplification and efficiency of the entire defective weft insertion repair system. It is. Furthermore, once the defective weft yarn and the next yarn are completely removed, a new weft yarn is pulled out from the nozzle and guided to the cutter position, and #
Since the weft is cut after restarting the IS machine and before the next weft insertion, the weft tension and posture do not change at all from normal weaving, and the texture of the weft does not change.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the device of the present invention. FIGS. 2(A) to 2(C) are plan views for explaining the operation.

Claims (1)

[Claims] A pair of pullbacks are provided between the storage device and the gripper (4), and press the circumferential surfaces of each other at a predetermined timing in response to a weft insertion defect detection signal to clamp the weft. Roller (12, 17)
a torque motor (13) with a feedback control circuit that rotates these pullback rollers at a predetermined timing in response to a weft insertion defect detection signal; A first suction tube (19) that performs suction operation at a predetermined timing according to a defect detection signal.
It is always placed in a standby position near the cutter (C), and the main nozzle (
A second suction pipe (23) is placed in an operating position facing the jet nozzle of N) and performs a suction operation, and a second suction pipe (23) is provided near the jet nozzle of the main nozzle to detect when the weft has entered the main nozzle. , an optical yarn detector (27) that outputs a signal to stop the operation of the torque motor, to separate the pullback rollers from each other, and to stop the suction operation of the first suction tube; and in response to the weft insertion defect detection signal. An automatic defective weft extraction device for a loom, comprising a mechanism for opening a gripper (4) and disabling a cutter (C).