JPH02269838A - Weft-removing device in loom - Google Patents

Abstract

PURPOSE:To remove bad weft continuing to yarn feeder by providing a nozzle for weft-removing blowing weft to the yarn feeder side in a tensor between the yarn feeder and length-measuring device. CONSTITUTION:In a case of generation of weft breakage between a yarn feeder 1 and a length-measuring device 4, air is jetted from a nozzle 20 for weft- removing provided in a tensor 3. Remaining had weft pulled through the tensor is drafted from the tensor by the jetted air and blown to the yarn feeder side, then removed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a weft yarn for removing the weft yarn connected to the yarn supplying body when a weft breakage occurs in the section from the yarn supplying body to the length measuring device in a loom. Relating to a removal device.

<Prior art> In recent years, in order to automate the weft thread-pulling operation in weaving machines, devices have been realized that automatically draw the weft thread from the yarn feeder to the length measuring device and the weft insertion nozzle (Japanese Patent Application Laid-open No. 61-47
(See Publication No. 849).

<Problem to be solved by the invention> By the way, when a weft yarn breakage occurs in a yarn supplying body in use, it is normal to treat it as a defective product and replace it with another yarn supplying body. It is necessary to remove the weft yarn that has broken.

In particular, when weft breakage occurs between the yarn supplying body and the length measuring device, the weft on the length measuring device side can be inserted as is and removed by the traction removal device on the side opposite to weft insertion, but The problem is how to remove the weft threads.

In this respect, conventionally, the weft yarns have been removed manually or a suction pipe for the weft yarns has been provided between the yarn supplying body and the tensor, and the weft yarns have been pulled and removed by suction airflow from the suction pipes.

However, if it is done manually, it becomes a barrier to full automation, and if it is done by a suction pipe, it is necessary to increase the suction force, which causes the problem that the device becomes large-scale.

In view of these conventional problems, the present invention provides a loom that can remove defective weft threads connected to the yarn supply body with a simple device when weft breakage occurs in the section from the yarn supply body to the length measuring device. The purpose is to provide a weft removal device for

Means for Solving the Problems> For this reason, the present invention provides a tensor between the yarn supplying body and the length measuring device with a weft removal nozzle for blowing the weft yarn toward the yarn supplying body side by jetting air, A weft removal device is constructed.

<Function> In the above configuration, when a weft yarn breakage occurs in the section from the yarn supplying body to the length measuring device, air is released from the weft removal nozzle provided on the tensor in order to remove the defective weft yarn connected to the yarn supplying body. Perform injection. Then, the remaining defective weft yarns that have been pulled through the tenser are pulled out from the tenser by the jetted air, and are blown toward the yarn supplying body and removed. This results in
It becomes possible to replace the yarn supplying body with a new one and draw the weft yarn through it.

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

Referring to FIG. 1, the weft yarn YI (or Y2) from the yarn supplying body 1 (or yarn supplying body 2) passes through a tensor 3 and then is guided to a length measuring device 4.

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 in a stationary state, and a drum 6 that is driven by a tM actuator tough. 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 photoelectric 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 yarn from the length measuring device 4 is guided to the weft insertion nozzle I3, which includes a nozzle section 13a that injects pressurized air for weft insertion as well as a suction force at the rear end of the nozzle 13. A drawing nozzle portion 13b is formed to inject pressurized air for drawing the weft thread. Each nozzle part 13
Air injections a and 13b are controlled by the control device 10 via valves (not shown).

A suction-type weft traction and removal device 14 connected to a blower (not shown) is provided on the opposite side of the weft insertion path of the loom. This weft pulling and removing device 14 is also controlled by the control device 1.
Controlled by 0.

Here, as shown in FIG. 2, the tensor 3 is equipped with clamping bodies 15 and 16 made up of a pair of leaf springs, and an electromagnet 1 to adjust the clamping force of these and to enable release.
7.18.

Furthermore, the tensor 3 is provided with a weft drawing nozzle 19 on the entrance side having a thread guiding hole 19a and an injection port 19b surrounding the thread guiding hole 19a.

Furthermore, on the entrance side, in the opposite direction to the nozzle 19 for drawing the weft thread, there is a thread guiding hole 20a and an injection port 2 surrounding the thread guiding hole 20a.
0b and a weft removing nozzle 2o.

Air injection from these nozzles 19, 20 is controlled by the control device 1° via valves (not shown).

Moreover, each yarn supplying body 1.2 is provided between each yarn supplying body 1.2 and the tensor 3.
．． A ring 21,22 is provided, through which the weft yarn from 2 is threaded. These rings 21 and 22 have slits (not shown) on their inner peripheries, and are connected to a blower (not shown) via a valve to generate suction airflow.

In addition, a yarn feed nozzle 23 is provided to blow the weft tip of the yarn supplying body 1.2 toward the tensor 3 when the weft is drawn through, and the yarn feeding nozzle 23 blows the weft yarn tip of the yarn supplying body 1.2 toward the tensor 3. After passing the thread through the thread feed nozzle 23, the thread is placed on standby.

In addition, a nozzle 24 for drawing the weft thread is provided on the entrance side of the length measuring device 4, and the air jetted from this nozzle 24 passes through the vibrator of the guide 9 for winding, and then jets out from its outlet. The weft thread is directed toward the weft entrance section at the rear end of the weft insertion nozzle 13.

The air injection of the nozzles 23, 24 is also controlled by the control device 10 via valves not shown.

A signal from the weft sensor 25 is input to the control device 10.

The weft sensor 25 is a photoelectric sensor installed near the weft path in order to detect weft breakage in the section from the yarn feeders 1 and 2 to the length measuring device 4, and outputs a signal corresponding to the presence or absence of the weft. Output.

In addition, in the figure, 26 is a warp, 27 is a yarn end catching yarn, 28 is a reed, 2
9 is a woven fabric, 30 is a cutter on the weft insertion side, and 31 is a cutter on the opposite side to the weft 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, the nozzle part 13a of the weft insertion nozzle 13
After the air injection is started and a predetermined advance injection is performed, the electromagnetic actuator 7 is activated and the locking body 8 is withdrawn.
As a result, the lock on the weft is released, 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 number of weft yarns unwound from the drum 6 is detected by an unwinding sensor I2.
If the l pick length is N turns, when the number of signals generated from the unwinding sensor 12 reaches N, t
The m actuator 7 is actuated to push in the locking body 8, and when N turns have been unwound, the weft is locked in the locking body 8, and weft insertion is completed.

After the weft is beaten by the reed 28, the weft is beaten by the cutter 30 on the weft insertion side, and by the cutter 30 on the non-weft insertion side.
1.

Next, a case will be described in which a weft breakage occurs in the section from the yarn supplying body 1 to the length measuring device 4 (for example, point A in FIG. 1).

When such a weft breakage occurs, a signal indicating no weft is sent from the weft sensor 25 to the control device 10, and based on this, the control device 10 performs the following operations.

First, the loom is stopped at a predetermined phase.

Next, in order to remove the defective wefts from the four length measuring devices, the electromagnetic actuator 7 is activated to remove the weft from the locking body 8, as shown in FIG.
is withdrawn, and the length measuring device 4 is released from the weft. Then, the weft insertion nozzle 13 is made to eject air to insert the weft yarn remaining in the length measuring device 4 and bring it to the weft traction removal device 14, thereby causing it to be traction removed.

In addition, in order to remove defective weft yarns connected to the yarn supplying body 1, a third
As shown in the figure, a nozzle 20 for weft removal of the tensor 3
Air is ejected from the Then, the weft yarn threaded through the tensor 3 is blown in the opposite direction by the jet of air, pulled out from the tenser 3, and directed toward the yarn supplying body l side, where it passes through the ring 21.
(See Figure 4). At this time, if a suction airflow is generated from the slit in the inner circumference of the ring 21, the entanglement will be more secure. Incidentally, it is preferable that the tensor 3 is kept in an open state by exciting the electromagnet 18.

Next, the weft yarn Y2 from the preliminary yarn supply body 2 is drawn through.

As shown in FIG. 4, air is ejected from the yarn feed nozzle 23. Then, the tip of the weft yarn of the yarn supplying body 2 is blown away by the jetted air, heads toward the entrance of the tensor 3, and is drawn through the tensor 3. Note that the tensor 3 is left open.

The weft tip pulled through the tensor 3 is further blown away by the nozzle 19, and the winding of the length measuring device 4 is directed toward the inlet of the guide 9. At this time, the nozzle 24 is also injecting air. The air ejected from the nozzle 24 passes through the pipe of the winding guide 9 and is ejected from its outlet, and the ejected airflow blows the weft tip toward the weft inlet at the rear end of the weft insertion nozzle 13.

In this weft insertion nozzle 13, air is ejected from the drawing nozzle part 13b together with the nozzle part 13a, and the weft insertion nozzle 13 generates a suction airflow at the weft entrance part by the air injection, and this suction airflow causes the weft The tip is pulled by this and drawn into the weft insertion nozzle 13. As a result, the weft yarn is smoothly drawn through the weft insertion nozzle section 3.

After this, in order to dispose of the excess weft coming out from the tip of the weft insertion nozzle 13, the weft from the weft insertion nozzle 13 is sucked into the weft pulling and removal device 14, and then the electromagnetic actuator 7 is activated to remove the weft from the locking body. 8, the cutter 30 on the weft insertion side is operated to cut the weft, and the cut weft is pulled and removed by the weft pulling and removing device 14.

Then, 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, when a weft breakage occurs in the section from the yarn supplying body to the length measuring device, it is possible to remove the defective weft connected to the yarn supplying body with a simple device. In particular, since it is performed by jetting air, compared to using a suction pipe etc.
The effect is that the device can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a loom showing an embodiment of the present invention, FIG. 2 is a detailed view of the tensor portion, and FIGS. 3 and 4 are diagrams showing the weft breakage process. 1, 2... Yarn feeder 3... Tenser 4...
・Length measuring device 6... Drum 8... Locking body
9... Winding guide 10... Control device 13
... Weft insertion nozzle 14 ... Weft traction removal device 1
9... Nozzle for drawing the weft thread through 20... Nozzle for removing the weft thread 21. 22... Ring 23...
・Nozzle 24... Nozzle 25... Weft sensor patent applicant Nissan Motor Co., Ltd. Representative Patent attorney Fujio Sasashima

Claims (1)

[Claims] A weft removal device for a loom that removes weft threads connected to the yarn supplying body (1) when a weft breakage occurs in the section from the yarn supplying body (1) to the length measuring device (4). ) and the length measuring device (4), a weft removal nozzle (20
) A weft removal device for a loom, characterized in that it is provided with: