JPH02210041A - Weft-feeder exchanger in weaving machine - Google Patents

Abstract

PURPOSE:To exchange a used yarn feeder with a new yarn feeder without binding the weft terminal to the other by stopping the weaving machine, when the remaining yarn in the yarn feeder becomes less than a prescribed amount, removing the weft in the weft inserting unit and blowing the top of weft in the new yarn feeder into the weft-inserting unit. CONSTITUTION:When the weft yarn remaining in the weft yarn feeder 1 becomes less than a prescribed amount, it is detected by a yarn-remaining sensor 28 and the weaving machine is stopped by the machine stopper 20. Then, weft drawer 14 is used to remove the weft remaining in the weft-inserting unit 18 and the new weft terminal from the new weft feeder 2 is blown from the air jetted from nozzle 20 and passed through the weft-inserting unit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a weft yarn feeder changing device for automatically changing a weft yarn feeder in a loom.

<Conventional technology> In conventional looms, the yarn feeder is replaced by tying the picktail of the yarn feeder to the weft tip of the preliminary yarn feeder in advance, and then replacing the yarn feeder when all the wefts of the yarn feeder are used up. , the weft yarn of the preliminary yarn feeder was pulled out (Japanese Patent Application Laid-Open No. 58-18446).
(see publication).

<Problems to be Solved by the Invention> However, if this is done, the knots of the weft threads will be woven into the woven fabric, resulting in weaving defects.

Although it is possible to remove the knots using an auto-start device after weaving the knots, this is not preferable because the knots make some of the warp threads excessively tense, resulting in weaving flaws.

In addition, if the weft is made of glass thread, it is easy to break, so
There was a problem in that it was impossible to tie the knot itself, and it could not be automated.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a weft yarn feeder changing device for a loom that can automatically change a yarn feeder to a preliminary yarn feeder without tying a knot.

<Means for Solving the Problems> For this reason, the present invention provides a loom in which a weft is pulled out from a yarn feeder and inserted by a weft inserting device, in which the amount of remaining weft yarn is detected in the yarn feeder. A loom stop device is provided with a remaining thread sensor, and stops the loom when the remaining thread sensor detects that the amount of remaining thread is less than a predetermined value; and a weft traction and removal device that pulls and removes the weft in the weft insertion device. and a weft thread pulling device which has a yarn feed nozzle provided on at least the preliminary yarn feeder and draws the tip of the weft of the preliminary yarn feeder through the weft inserting device by means of jetted air. This constitutes a body exchange device.

<Function> In the above configuration, when the weft yarn is not tied between the yarn supply body and the preliminary yarn supply body, and the amount of weft yarn remaining in the yarn supply body becomes less than a predetermined value, this is detected by the residual yarn sensor. First, the loom is stopped by the loom stop device. Next, the weft yarn remaining in the weft insertion device is pulled and removed by the weft yarn pulling and removing device. Next, the weft tip of the preliminary yarn supplying body is blown away by the jet air from a yarn feeding nozzle provided on the preliminary yarn supplying body, and is drawn through the weft inserting device.

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

Referring to FIG. 1, the weft yarn Yl from the yarn supplying body I passes through the tensor 3, and then is guided to the length measuring device 4 via the yarn guide hole 23, 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 circumferential surface of the distal end 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 in order to control these, signals from the winding amount sensor 11 and the unwinding sensor 12 are input to the control device 10. .

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 from the length measuring device 4 is guided to a weft insertion nozzle 13, which in addition to a nozzle part 13a that injects pressurized air for weft insertion, also injects pressurized air for drawing the weft through. A drawing nozzle portion 13b is formed.

Air injection from each nozzle portion 13a, 13b is controlled by a control device 10 via a valve (not shown).

Note that the length measuring device 4 and the weft insertion nozzle 13 constitute a weft insertion device.

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 traction removal bag W14 is also controlled by the control device 1.
Controlled by 0.

Here, the support shaft 15 of the preliminary yarn feeder 2 forms a double pipe as shown in FIG. An inner cylinder 15b is provided on the tip side of the preliminary yarn feeder 2 of this flow path.
A nozzle 17 is formed to inject air inward. This is used to draw the tip of the weft Y2 wound around the preliminary yarn feeder 2 into the inner cylinder 15b. A cutter 8 is attached to cut the drawn-in weft tip to a constant length.

Further, on the base end side of the preliminary yarn feeder 2 of the inner cylinder 15b, a yarn feeding nozzle 20 is provided as a weft drawing device, which injects pressurized air guided through a valve 19, and blows away the weft tip to weft the weft. It is now possible to pull it through the loading device.

In addition to this, the following devices are provided as the weft thread pulling device.

A nozzle 21 for drawing through is provided on the inlet side of the tensor 3.

A pipe 22 is provided on the entrance side of the length measuring device 4, and a thread guide hole 23 is formed in the middle part of the pipe 22, perpendicular to this pipe-shaped winding, and connected to the entrance part of the guide 90. A nozzle 24 is provided at one end, and a pipe 22
A suction pipe 25 and a cutter 26 are provided at the other end.

Furthermore, a nozzle 2 for drawing the thread is provided on the entrance side of the thread guiding hole 23.
7 is provided, and the air jetted from this nozzle 27 passes through the pipe of the winding guide 9 from the yarn guide hole 23, and then is ejected from the outlet thereof to the weft entrance at the base end of the weft insertion nozzle 13. It is now heading towards.

These weft thread threading devices are controlled by a control device 10.

A signal from the remaining yarn sensor 28 is input to the control device 10.

The remaining yarn sensor 28 is a photoelectric sensor provided near the yarn supplying body 1 and outputs a signal corresponding to the amount of yarn remaining on the yarn supplying body 1.

When the remaining yarn sensor 28 detects that the amount of remaining yarn is below a predetermined value, the control device 10 operates the loom stop device 29 to stop the loom, and then activates the weft traction removal device 14 to stop the loom. The weft yarn Y+ in the inserting device is pulled and removed, and then the weft yarn Yt of the preliminary yarn supply body 2 is pulled through the weft inserting device by the weft threading device.

In addition, in the figure, 30 is a warp, 31 is a yarn end catching yarn, 32 is a reed, 3
3 is a woven fabric, 34 is a cutter on the weft insertion side, and 35 is a cutter on the opposite side to weft insertion.

Next, the effect 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 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 actuated 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 32, the weft is beaten by the cutter 34 on the weft insertion side, and by the cutter 3 on the non-weft insertion side.
It is cut by 5.

Next, a case where the weft yarn of the yarn supplying body 1 runs out will be explained.

In the preliminary yarn feeder 2, the valve 16 is opened in advance and air is injected from the nozzle 17 to draw the tip of the weft Y2 into the inner cylinder 15b, and after the air injection is stopped, the weft tip is cut by the cutter 18. I'm waiting.

Here, as shown in FIG. 3, when the weft yarn of the yarn feeder l runs out, the remaining yarn sensor 28 sends a signal indicating that there is no yarn left to the control device 1.
0, and based on this, the control device 10 performs the following operations.

First, the loom stop device 29 is activated to stop the loom at a predetermined phase.

Next, the electromagnetic actuator 7 is actuated to move the locking body 8 out, thereby releasing the length measuring device 4 from locking the weft yarn.

Then, the weft insertion nozzle 13 injects air to the length measuring device 4.
The remaining weft threads are allowed to fly and reach the weft thread traction and removal device 14, where they are pulled and removed (see Fig. 3).

Next, as shown in FIG. 4, the valve 19 is opened to cause the yarn feed nozzle 20 to inject air. Then, the tip of the weft yarn of the preliminary yarn feeder 2 is blown away by the jetted air, and is directed toward the inlet of the tensor 3 and drawn through the tensor 3. Note that the tensor 3 is capable of adjusting its gripping force, and is kept in an open state when being pulled through.

The weft tip that has been pulled through the tensor 3 is further blown away by the nozzle 21 and directed toward the thread guiding hole 23 of the pipe 22. At this time, the pipe 22 is ejected with air by a nozzle 24 from one end thereof, and a suction pipe 25 is provided at the other end, so the weft tip is guided from the yarn guiding hole 23 to the suction pipe 25.

Next, after stopping the operations of the nozzles 20, 21, 24 and the suction pipe 25, the weft ends are cut by the cutter 26.

Next, as shown in FIG. 5, air is injected from the nozzle 27. The air ejected from the nozzle 27 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 base 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 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 tip to is drawn into the weft insertion nozzle 13 by this. As a result, the weft yarn is smoothly drawn through the weft insertion nozzle 13.

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 34 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.

In the above embodiment, for the sake of simplicity of explanation, the yarn supplying body and the preliminary yarn feeding body are separated, the yarn remaining sensor is provided on the yarn supplying body side, and the yarn feeding nozzle is provided on the preliminary yarn feeding body side. Needless to say, for continuous replacement, it is sufficient to provide each yarn with a remaining yarn sensor and a yarn feed nozzle.

Further, FIG. 6 shows another embodiment of the yarn supply body changing device.

This allows the support shaft 15 to be tilted, and the weft is pulled out from the yarn feeder 50 fitted onto the support shaft.As a preliminary yarn feeder, a large number of yarn feeders 51 to 54e are piled up to create a cylindrical structure. It is stored in the yarn supply case 55.

When the remaining yarn sensor 28 detects that the remaining yarn in the yarn supplying body 50 is gone, the support shaft 15 is first tilted downward to throw away the remaining core tube 5Qa into the recovery container S6, and then Turn the shaft 15 upward.

Then, after setting the first stopper 57 of the yarn supplying body case 55 to the locking position and setting the second stopper 58 to the retracted position, the yarn supplying body 51 is dropped from the yarn supplying body case 55, and the support shaft 15 is
Insert into. The weft tip of the yarn supplying body 51 is placed in its core cylinder, and at this time, the weft tip enters the hollow part of the support shaft 15.

After this, the support shaft 15 is placed in a substantially horizontal position, and the support shaft 15
Air is ejected from the yarn feeding nozzle 20 to draw the weft yarn through.

Incidentally, in order to remove the weft yarn from the drum 6, the guide 9 may be reversed for winding while generating a traction airflow within the pipe 22.

<Effects of the Invention> As explained above, according to the present invention, the yarn supplying body can be automatically replaced with the preliminary yarn feeding body without tying the weft yarn between the yarn supplying body and the preliminary yarn feeding body. Therefore, weft knots will not be woven into the woven fabric and cause fabric flaws. Furthermore, it becomes possible to automate glass threads that cannot be tied themselves.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a loom showing an embodiment of the present invention, FIG. 2 is a detailed view of the preliminary yarn supply body, FIGS. 3 to 5 are diagrams showing the process of replacing the yarn supply body, and FIG. FIG. 6 is a diagram showing another embodiment of the yarn supply body exchanging device. 1... 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 15...Support shaft 20...Yarn feed nozzle 21...Nozzle 27...Nozzle patent applicant Nissan Motor Co., Ltd. Representative Patent attorney Fujio Sasashima

Claims (1)

[Claims] The weft is pulled out from the yarn feeder (1) and inserted into the weft insertion device (4, 13).
), a remaining yarn sensor (28) detects the amount of remaining weft yarns on the yarn feeder (1).
a loom stop device (29) that stops the loom when the remaining yarn sensor (28) detects that the amount of remaining yarn is less than a predetermined value, and a weft that pulls and removes the weft in the weft inserting device. A pulling removal device (14) and a yarn feed nozzle (20) provided at least on the preliminary yarn supply body (2) are used to pull the weft tip of the preliminary yarn supply body (2) to the weft insertion device using jet air. Weft thread pulling device (20, 21,
27) A weft yarn feeder changing device for a loom, characterized by comprising: