JPH03152246A - Weft-removing apparatus for fluid jet loom - Google Patents

Abstract

PURPOSE:To automatically remove defective yarn without fail even if float is generated in the yarn by stopping the operation of a loom upon generation of weft-insertion defect and, before ejecting a weft connected to the defective yarn toward a pulling apparatus opposite to the weft-insertion side, inserting a guide member to invert the direction of the weft. CONSTITUTION:Upon detecting the generation of weft-insertion defect, the cutting operation of a cutter is inactivated to stop a loom, the rotation of the main shaft of the loom is reversed to expose the defective waft-insertion yarn M on a cloth fell 6 and a weft 5 connected to the defective yarn is ejected toward a pulling apparatus 13 placed at the side opposite to the weft-insertion side. Before ejecting the yarn, a swingable or rotatable guide member 10 is inserted between a cloth fell 6 and the above weft-ejection path and is made to contact with the weft 5. The weft 5 is temporarily inverted toward the side of the fluid nozzle 3 and ejected to the side opposite to the weft-insertion side in a pulled state to pull and remove the defective yarn by the above pulling apparatus 13.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a weft removal device that automatically removes a weft when a weft insertion failure occurs in a fluid jet loom.

<Prior art> Conventional examples of this type of weft removal include the following (Japanese Patent Laid-Open Nos. 62-6938 and 62-6).
(See Publication No. 2965).

That is, when a weft thread detector on the side opposite to weft insertion detects a weft insertion failure, the operation of the loom is stopped. Here, since the loom is operating at high speed, defective weft yarns will be beaten before the loom stops. Furthermore, when stopping, the operation of the cutter device is temporarily stopped, cutting of the defective weft immediately after beating is stopped, and the defective weft is connected to the main nozzle.

Then, by rotating the loom in the reverse direction, the defective weft yarn is exposed on the woven cloth, and then the weft yarn is ejected from the main nozzle and is sucked by the suction device on the side opposite to the weft insertion.

As a result, the defective weft yarns connected thereto become zero characters and are gradually peeled off from the weft insertion side, thereby removing the defective weft yarns. Thereafter, the weft yarns including the defective weft yarns are cut and the loom is restarted.

<Problems to be Solved by the Invention> However, in such a conventional weft removal device, the weft is injected from the main nozzle, and the suction device on the side opposite to weft insertion sucks the weft to remove the defective weft from the fabric. Since the weft was to be peeled off, there were cases where the weft could not be removed reliably as shown below. In other words, when a part of the defective weft is protruding upward from the upper warp (hereinafter referred to as scooping), when the defective weft is sucked from the side opposite to the cotton insert, the defective weft comes into contact with the warp at that part. Due to the folded shape, traction resistance becomes large and defective weft yarns cannot be removed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a weft removal device that can automatically and reliably remove defective wefts even if the defective wefts are scooped.

Means for Solving the Problems> For this reason, firstly, the present invention prevents cutting of the weft yarn when a weft insertion failure occurs, and stops the loom with the weft yarn with the failure of weft insertion connected from a fluid injection nozzle. Then, with the defective weft yarns exposed on the fabric front, the weft yarns are injected toward the opposite side of the weft insertion, and the defective weft insertion is pulled and removed by a traction device placed on the opposite side of the weft insertion. In this invention, before the weft yarn is ejected toward the side opposite to the cotton insertion side, a guide member is provided which is inserted between the fabric front and the path through which the weft yarn is ejected and comes into contact with the weft yarn.

Further, in a second aspect of the present invention, the guide member is provided with means for imparting at least one of vibration and rotation.

As described above, firstly, when a weft insertion failure occurs and the weft is ejected from the fluid jet nozzle, the guide member is inserted into the warp row between the fabric front and the path where the weft is ejected. As a result, the leading end side of the defective weft yarns connected from the fluid injection nozzle is temporarily drawn into the fluid injection nozzle side, makes a U-turn, and is supplied to the traction device on the opposite side of the weft insertion, so that even if the weft yarns are scooped, the wefts can be removed. The section is drawn into the warp shed and the defective weft threads are reliably removed by the traction device on the opposite side of the weft insertion.

Secondly, since at least one of vibration and rotation is applied to the guide member, even when a defective weft has bitten into the weft and is difficult to come out, the guide member comes into contact with the weft and the U When turning, the rotation and vibration of this guide member exerts a force that forcibly pulls the weft yarns away from the woven fabric, so that defective weft yarns can be removed more reliably.

<Example> An example of the present invention will be described below based on FIGS. 1 to 11.

FIG. 1 is a block diagram showing the overall configuration. In FIG. 2(A) and FIG. 3(A), a reed 2 is attached to a reed holder 1 that swings in the front-rear direction of the loom.
An air injection type main nozzle 3 as a fluid injection nozzle is attached to the reed holder 1 on one side.

Then, the warp threads 4 are formed by a shedding device (not shown).
The weft yarn 5 is ejected from the main nozzle 3 into the opening by an air flow and inserted into the opening, and then the weft yarn 5 is beat against the cloth facing 6 through the layer 2 to form a woven fabric 7.

A bracket 8 is attached to the reed holder 1 between the main nozzle 3 and the 4th row of warp threads and located on the weaving surface 6 side from the spray direction of the main nozzle 3, and an electromagnetic solenoid 9 is attached to the bracket 8. It is being

A rod-shaped guide member 10 is attached to the im solenoid 9, and this guide member 10 is adapted to project from the opposite side of the weft insertion side of the weft yarn 5 so as to come into contact with the weft yarn 5 by controlling the energization of the electromagnetic solenoid 9. There is.

As shown in FIG. 3(A), the main nozzle 3 is supplied with the weft 5 from the weft length measurement and storage device 11. A weft gripping device 12 for gripping and releasing the grip on the weft 5 is provided between the main nozzle 3 and the weft length measurement storage bag y111.

11A and 11B are weft locking bodies.

Further, a suction device 13 as a traction device for suctioning the weft yarn 5 using an air flow is provided on the side opposite to the weft insertion side. This suction bag 213 is configured so that the air jetted from the jetting vibrator 13A is introduced into the introducing by 113B to form a suction force on the weft yarn 5. Further, a weft detector (not shown) is provided on the opposite weft insertion side as defective weft detection means for detecting whether or not the weft 5 has arrived.

The control device C operates various devices according to the flowchart shown in FIG. 4, and in particular constitutes a loom stop means F and a weft ejection means G.

In FIG. 2(A), 14 is a cutter device for cutting the weft 5, and 15 is an auxiliary nozzle.

Next, the effects are shown in Figures 3 (A), (B) and 5 (A).
), (B) to FIG. 11, and will be explained according to the flowchart in FIG. 4.

First, to explain the normal weaving process, the warp threads 4 are opened by a shedding device, the weft threads 5 are injected into the opening from the main nozzle 3, and the weft threads are inserted into the weft threads by the reed 2. A woven fabric 7 is formed by beating the woven fabric 7.

During the weaving process, a routine shown in the flowchart of FIG. 4 is executed.

That is, in step (hereinafter abbreviated as S in the drawings) 1, it is determined whether or not weft insertion failure has occurred based on the detection signal from the weft detector, and if YES, S is
If the answer is NO in step 2, the routine is ended.

In S2, the weft insertion failure signal is turned on and the process proceeds to S3.

In S3, the main shaft stop angle for stopping the loom is set to 180° for the next cycle, taking into consideration the inertial movement of the loom.

In S4, the loom stop means F of the control device C controls the main motor for operating the loom to stop so that the main shaft stops at the 180° angle. At this time, the weft gripping device 12 holds the weft 5
is brought into the gripping state, and the cutting operation of the cutter device 14 is stopped.

In S5, it is determined whether the main motor has stopped, that is, the operation of the loom has stopped. If YES, the process advances to S6, and if NO, the process advances to S4.

When the loom is stopped, the defective weft M is beaten by the reed 2 and woven into the warp 4, as shown in FIGS. 3(^) and 3(B). At this time, the defective weft M is connected to the weft 5 of the main nozzle 3.

In S6, the main motor is reversely rotated to reversely rotate the main shaft by 360°.

Due to this reverse rotation, the warp threads 4 are disassembled for one cycle, and as shown in FIGS.
be exposed to.

In S7, the electromagnetic solenoid 9 is energized so that the guide member 10
As shown in FIG. 6(A), the weft thread 5 is introduced into the opposite side of the weft insertion side in order to be engaged with the weft thread 5.

In S8, the auxiliary motor (not shown) is rotated to measure the length of the weft yarn 5 and store it in the drum of the weft side length measurement and storage device 11 for two times of weft insertion.

In S9, the operation of the auxiliary motor is stopped.

At this time, the auxiliary motor is stopped while the weft locking body 11B on the main nozzle 3 side is pulled out from the drum of the weft length measurement and storage device 11.

In SIO, the weft ejection means C of the control device C injects air from the main nozzle 3 and the auxiliary nozzle 15, and at the same time operates the suction device f13 to remove the defective weft M. Specifically, since the weft thread locking body 11B is pulled out and the weft thread 5 of the main nozzle 3 and the defective weft thread M are connected, when air is injected from the main nozzle 3, the weft thread of the weft length measuring and storage device 11 is removed. The weft threads 5 are gradually drawn out while the weft threads 5 are fed out toward the suction device 13, and along with this, the defective weft threads M are also gradually drawn out. At this time, the guide member 10 on the weft insertion side is brought into contact with the weft 5 as shown in FIG. It is gradually sent out toward the suction device 13 on the side opposite to the weft insertion side, and is sucked by the suction device 13 and removed. Therefore, even if the defective weft M is scooped, the defective weft M is once pulled out to the weft insertion side, so the defective weft M can be automatically pulled out from the warp shedding without being caught on the warp 4, and the defective weft M can be automatically pulled out from the warp opening without being caught by the warp threads 4. Even if this happens, work efficiency can be greatly improved.

At Sll, the electromagnetic solenoid 9 is de-energized and the guide member 10 is withdrawn below the weft 5 as shown in FIG. 8(A).

In S12, the weft 5 is cut by the cutter device 14 as shown in FIG.
), cut on the weft insertion side as shown in (B). The cut weft yarn 5 is suctioned and removed by the suction device 13.

At SI3, the main motor is rotated 240 degrees in reverse to rotate the main shaft 240 degrees in reverse.

In 314, it is determined whether the main shaft stop angle has reached 300° (loom starting position), and if YES, the process advances to S15, and if NO, the process returns to S13.

At S15, the main motor is stopped and the loom is moved to the position shown in Fig. 10 (A
), adjust to the starting position as shown in (B).

At step 316, the auxiliary motor is rotated to measure and store the weft 5 in the drum of the weft length measurement and storage device 11.

In S17, the auxiliary motor is stopped to stop measuring and storing the weft 5.

At 31g, the cutter device 14 cuts the weft yarn 5 blown out from the main nozzle 3.

After the loom is brought to the restart position as shown in FIG. 11 in this manner, the loom is automatically restarted.

Note that the guide member may be provided as shown by the dashed line in FIG. 3(A) (located within the warp shedding). Although the description has been given of a case in which the movement is moved forward and backward using an electromagnetic solenoid, the invention is not limited to this, and vibration or rotation may be applied in addition to the movement forward and backward.

That is, as shown in FIG. 2(B), a vibrator (vibration imparting means) 20 is interposed in the bracket 8 of the if electromagnetic solenoid, or the ft electromagnetic solenoid is rotatably supported by the flaket 8, and the electromagnetic A gear 21b may be attached to the solenoid 9, and the gear 21 may be rotated by the motor 21 (rotation imparting means 21).

If at least one of these vibrations and rotations is applied, the force for forcibly peeling off the defective weft insertion from the woven fabric will be stronger than that of moving the guide member forward and backward, so that the defective weft yarns can be removed more effectively. This has the effect of ensuring that

<Effects of the Invention> As explained above, the present invention, when a weft insertion defect occurs, injects the weft from the fluid jet nozzle, and directs the leading end of the defective weft to the fluid jet nozzle side using the weft guide member. I made a temporary U-turn to pull it in, and the traction device on the opposite side of the weft insertion was used to pull it out.
Even if a rake occurs in a defective weft, the defective weft can be automatically and reliably removed by pulling.

[Brief explanation of the drawing]

Fig. 1 is a block diagram, Fig. 2 (A) is a perspective view showing one embodiment of the present invention, Fig. 2 (B) is a perspective view of main parts showing another embodiment, Fig. 3 (A) is a plan view of the same as above, Fig. 4 is a flowchart of the same as above, Fig. 3 (B), Fig. 5 (A), (
B) to FIG. 11 are diagrams for explaining the same effects as above. 2... Reed 3... Main nozzle (fluid injection nozzle) 4... Warp 5... Weft 6... Orimae magnetic solenoid 10... Guide unit device 2C... Vibrator (vibration Application means) device (rotation application means) 9... Electron 13... Suction bag 21... Drive Fig. 2 (A) Fig. 2 old) 0 Fig. 3 (Δ) Fig. 3 (8) 5!!! old) Fig. 6 (A) Fig. 6 CB > Fig. 7 (Δ) Fig. 7 top) Fig. 8 (A) Fig. 8 (8) Fig. 9 CB)

Claims (2)

[Claims] (1) When a defective weft insertion occurs, the weft is stopped from cutting and the loom is stopped while the defective weft insertion is continued from the fluid jet nozzle, and then weft is inserted with the defective weft yarn exposed on the fabric front. In a weft removal device for a fluid jet loom, the weft is ejected toward the side and a traction device disposed on the side opposite to the weft insertion side pulls and removes defective wefts. 1. A weft removal device for a fluid jet loom, characterized in that a guide member is provided which is inserted between a cloth cover and a path through which the weft is ejected and comes into contact with the weft before the weft is ejected. (2) The weft removal device for a fluid jet loom according to claim 1, wherein the guide member is provided with means for imparting at least one of vibration and rotation.