JPH02269837A - Weft-pulling device in loom - Google Patents

Abstract

PURPOSE:To save weft and simplify device structure by drawing top end of weft pulled through weft-inserting nozzle with suction pipe at the weft-inserting nozzle side and removing. CONSTITUTION:Pulling of weft through a weft-inserting nozzle 13 is detected by a weft sensor 23 and air-jetting of the weft-inserting nozzle is stopped. Then, weft left from top end of the weft-inserting nozzle is sucked by a suction pipe 20 for pulling and removing weft at the top end side of weft-inserting nozzle. Thus, weft is cut by a cutter 21 between the weft-inserting nozzle and the suction pipe in a pulled state of the weft through the suction pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a weft thread drawing device for drawing a weft thread through a weft insertion nozzle in a loom.

(Prior art) When weft breakage occurs between the yarn supply body and the weft insertion nozzle in a loom, it is necessary to remove the defective weft yarn and then pull the weft yarn from the yarn supply body side to the weft insertion nozzle. Therefore, the weft is blown away by air jet and pulled through to the weft insertion nozzle.

When drawing the weft, the weft cannot be stopped at the tip of the weft insertion nozzle, so the weft is blown to the suction pipe on the weft insertion side, and then the weft is cut at the tip of the weft insertion nozzle.
After removing the excess weft by pulling it away with a suction pipe, the machine is ready for restarting.

<Problems to be Solved by the Invention> However, in such conventional weft thread pulling devices, when drawing the weft thread, the weft thread from the tip of the weft insertion nozzle is blown to the suction pipe on the opposite side of the weft insertion. Therefore, there was a problem in that more than one weft worth of weft had to be discarded, which was wasted.

In addition, as shown in Japanese Patent Application Laid-Open No. 60-2749, a suction vibrator with a baffle plate is arranged at the tip of the weft insertion nozzle, and when the weft is pulled through, the suction pipe is moved to the tip of the weft insertion nozzle. It has also been proposed that the baffle plates are placed opposite each other so that the weft yarn coming out of the tip of the weft insertion nozzle is brought into contact with the baffle plate and guided to the suction pipe, but since the suction pipe and the baffle plate are movable, the device structure is difficult. The problem was that it became complicated.

In view of these conventional problems, the present invention reduces the length of the weft thread that is discarded when pulling the weft thread through.
To provide a weft thread drawing device for a loom which can save weft threads and has a simple device structure.

Means for Solving the Problems> For this reason, the present invention has the present invention, while jetting air from the weft insertion nozzle, the weft yarn on the yarn supplying body is transferred to the weft entrance portion at the rear end of the weft insertion nozzle by the air jet from the nozzle for drawing it through. In a weft thread pulling device of a loom that blows the weft thread through the weft inserting nozzle, a weft sensor detects the drawing of the weft thread into the weft inserting nozzle;
A control device is provided to stop the air injection of the weft insertion nozzle based on the weft thread pulling detection signal from the weft sensor, and a suction pipe for pulling and removing the weft thread is arranged on the tip side of the weft insertion nozzle. A cutter is placed between the suction pipe and the suction pipe.

<Function> In the above configuration, when pulling the weft yarn through, while the weft insertion nozzle is injecting air, the weft yarn on the yarn supplier side is blown to the weft entrance part at the rear end of the weft insertion nozzle by the air injection from the drawing nozzle. The weft thread sensor detects the weft thread being pulled through the weft inserting nozzle, and the air injection from the weft inserting nozzle is stopped based on the weft thread passing detection signal from the weft sensor. Then, the weft coming out from the tip of the weft insertion nozzle is sucked by a suction pipe for pulling and removing the weft at the tip of the weft insertion nozzle. That is, the weft yarn is inserted into the suction pipe by direct air flow without moving the suction pipe. Then, in this state, the weft is cut by a cutter between the weft insertion nozzle and the suction pipe.

<Example> An embodiment of the present invention will be described below based on the drawings.

Referring to FIG. 1, the weft yarn 2 from the yarn supplying body 1 is
After passing through, it is guided to the length measuring device 4 via a thread guiding hole 15, which will be described later.

The length measuring device 4 includes a rotating body 5 that is rotationally driven by a motor (not shown), a drum 6 that is supported by the rotating body 5 so as to be relatively rotatable and held stationary, and a drum 6 that is driven by an electromagnetic actuator. Plunges into the hole on the tip side circumferential surface of the
The locking body 8 to be withdrawn is provided, and the pipe-shaped winding guide 9 is attached to the rotary body 5 and rotates together with the rotary body 5 to guide the weft thread while winding it around the drum 6.

The motor for driving the rotating body 5 and the electromagnetic actuator 7 are controlled by a control device (controller) 10, and signals from a winding amount sensor 11 and an unwinding sensor 12 are input to the control device 10 for controlling these. .

The winding amount sensor 11 is a photoelectric sensor provided opposite to the circumferential surface of the drum 6, and outputs a signal corresponding to the winding amount of the weft yarn on the drum 6.

The unwinding sensor 12 is a rechargeable sensor provided on the front end side of the drum 6, and outputs a signal corresponding to the number of unwindings of the weft yarn being rewound around the drum 6 during weft insertion.

The weft from the length measuring device 4 is guided to a weft insertion nozzle 13, and air injection from the weft insertion nozzle 13 is controlled by a control device 10 via a valve (not shown).

As the weft thread pulling device, the following device is provided.

A pipe 1 is installed on the inlet side of the length measuring device 4 in a direction perpendicular to the weft.
4 is provided in the middle part of the pipe 14, and a vibrator-like winding is provided at right angles to this in the middle part of the pipe 14.
5 is formed. A nozzle 16 is provided at one end of the pipe 14, and a suction pipe 17 and a cutter 18 are provided at the other end of the pipe 14.

Further, a nozzle 1 for drawing the thread is provided on the entrance side of the thread guiding hole 15.
9 is provided, and the air jetted from this nozzle 19 passes through the pipe of the winding guide 9 from the yarn guide hole 15, and then is ejected from the outlet of the weft guide 9 to reach the weft inlet at the rear end of the weft inserting nozzle 13. It is now heading towards.

Further, a suction pipe 20 is provided with one end open near the tip of the weft insertion nozzle 13, and the other end of the suction pipe 20 is connected to a blower (not shown) via a valve. A cutter 21 is provided between the weft insertion nozzle 13 and the suction vibrator 20.

These weft thread threading devices are controlled by a control bag W110.

The control device 10 receives signals from the weft sensors 22 and 23.

The weft sensor 22 is a photoelectric sensor provided near the rear end of the weft insertion nozzle 13 to detect weft breakage, and outputs a signal depending on the presence or absence of a weft.

The weft sensor 23 is a photoelectric sensor provided near the tip of the weft insertion nozzle 13 to detect the weft thread being drawn through the weft insertion nozzle 13, and outputs a signal depending on the presence or absence of the weft.

In addition, in the figure, 24 is a warp, 25 is a yarn end catching yarn, 26 is a reed, 2
7 is a woven fabric, 28 is a cutter on the weft insertion side, and 29 is a cutter on the opposite side to the cotton insertion side.

Next, the action will be explained.

While the loom is in operation, the winding guide 9 rotates around the drum 6 due to the rotation of the rotating body 5 by the motor, and the weft thread is wrapped around the drum 6.
Wrap it around and store the measured length. Here, the winding amount on the drum 6 is detected by the winding amount sensor 11, and the rotation and stopping of the rotating body 5 is controlled so that the winding amount on the drum 6 is always a predetermined amount or more.

During weft insertion, air injection is started at the weft insertion nozzle 13, and after a predetermined advance air injection is performed, the electromagnetic actuator 7 is operated and the locking body 8 is withdrawn, thereby releasing the lock on the weft. , the weft is pulled out by the air jetted from the weft insertion nozzle 13, and weft insertion is started. At this time, the weft yarn on the drum 6 is pulled out while being rewound around the drum 6.

Then, the unwinding sensor 12 detects the number of weft yarns unwound from the drum 6.
If one bit length is N turns, when the number of signals generated from the unwinding sensor 12 reaches N, the electromagnetic actuator 7 is activated and the locking body 8 rushes in, which causes N turns. Once unwound, the weft is locked by the locking body 8, and weft insertion is completed.

After the weft is beaten by the reed 26, the weft is beaten by the cutter 28 on the weft insertion side, and by the cutter 28 on the non-weft insertion side.
It is cut by 9.

Next, a case where a weft breakage occurs between the length measuring device 4 and the weft insertion nozzle 13 will be described.

When such a weft breakage occurs, a signal indicating no weft is sent from the weft sensor 22 to the control device 10, and based on this, the control device 10 performs the following operations.

First, a loom stop circuit (not shown) is activated to stop the loom at a predetermined phase.

Next, in order to remove the defective weft yarn, the winding guide 9 is reversed by the motor via the rotating body 5. Then, drum 6
The upper weft yarn is unwound, but since the nozzle 16 generates jet air from one end of the weft 14 and the suction vibrator 17 is provided at the other end, the weft yarn is unwound as shown in FIG. Then, the unwound weft yarn is guided from the yarn guiding hole 15 to the suction vibrator 17 via the pipe 14.

Then, when the defective weft yarn is guided to the suction vibrator 17, the cutter 18 is operated to cut the weft yarn, and the nozzle 16
And the operation of the suction vibrator 17 is stopped. This results in
Defective wefts are removed.

Next, the weft is pulled through.

Air is jetted from the nozzle 19 for drawing through.

The air injected from this nozzle 19 passes through the pipe of the winding guide 9 from the thread guide hole 15 and is ejected from the outlet thereof.
While pulling out the weft yarn from the yarn supplying body 1 side, the jetted airflow blows the weft tip end toward the weft entrance portion at the rear end of the weft insertion nozzle 13.

At this time, the weft insertion nozzle 13 is also made to eject air, and the weft insertion nozzle 13 generates a suction airflow at the weft entrance by the air injection, and the weft tip is pulled by this suction airflow, and the weft insertion nozzle Drawn into 13.

As a result, the weft yarn is smoothly drawn through the weft insertion nozzle 13.

The weft thread is drawn through the weft insertion nozzle 13, and the weft thread is passed through the weft insertion nozzle 1.
When the weft comes out from the tip of the weft, this is detected by the weft sensor 23, and a weft drawing detection signal from the weft sensor 23 is sent to the control device 10.

Then, the control device 10 stops the air injection from the weft insertion nozzle 13 and the weft thread drawing nozzle 19.

At almost the same time, the suction pipe 20 is operated to suction the weft coming out from the tip of the weft insertion nozzle 13, as shown in FIG.

Next, the cutter 21 is operated to cut the weft between the weft insertion nozzle 13 and the suction pipe 20, and the cut weft is pulled and removed by the suction pipe 20.

Thereafter, the rotating body 5 is rotated by the motor, and a predetermined amount of weft is wound around the drum 6 by the guide 9 in preparation for restarting.

<Effects of the Invention> As explained above, according to the present invention, the tip of the weft yarn drawn through the weft insertion nozzle is pulled and removed by the suction pipe on the side of the weft insertion nozzle, so there is no need to discard it when the weft yarn is pulled through. It is possible to save the weft yarn by reducing the length of the weft yarn, and the series of operations until the weft yarn is pulled to the suction pipe on the weft insertion nozzle side is performed by air current.
The suction pipe etc. may be of a fixed type, which has the effect of simplifying the structure of the device.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a loom showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing the process of drawing a weft thread through. 1... Yarn feeder 4... Length measuring device 6... Drum 9... Winding guide 10... Control device 1
3... Weft insertion nozzle 14... Vibrator 14.
... Nozzle 19 ... Nozzle 20 ... Suction pipe 21 ... Cutter patent applicant Representative of Nissan Motor Co., Ltd. Patent attorney Fujio Sasashima

Claims (1)

[Claims] While blowing air from the weft insertion nozzle (13), insert the yarn supplying body (1
) side weft is blown to the weft inlet at the rear end of the weft insertion nozzle (13) by air jet from the drawing nozzle (19), and is drawn through the weft insertion nozzle (13). A weft sensor (23) detects the drawing of the weft into the weft insertion nozzle (13), and this weft sensor (
A control device (10) that stops the air injection of the weft insertion nozzle (13) based on the weft thread-drawing detection signal from the weft insertion nozzle (13).
At the same time, a suction pipe (20) for weft pulling and removal is arranged at the tip of the weft insertion nozzle (13), and a cutter (21) is provided between the weft insertion nozzle (13) and the suction pipe (20).
) is arranged.