JPS6321952A - Method for removing knot in replacement of feed yarn in fluid jet type loom - Google Patents

Abstract

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

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a method for removing yarn feeding knots [1] in fluid jet looms, more specifically, a method for removing knots from yarn feeding in a fluid jet loom, and more specifically, a method for removing weft yarns containing knots during yarn feeding change. Concerning methods to prevent this from occurring.

(Prior art) In a fluid jet loom, the rope production speed is high, so several yarn feeders are prepared in advance on the yarn feeder stand, and the tail end of the yarn feeder is connected to the yarn end of the next yarn feeder. By tying them together, yarn feeding and beating are performed automatically, allowing continuous operation of the loom.

When such an operation method is adopted, a knot]-1 is woven into the woven fabric each time the yarn is fed. In general textiles, the effect of this knot [1 is not [1:&], so the presence of this knot [I does not often cause a fatal textile defect.

However, in the case of special fabrics such as glass cloth used as the base material for printing plates for mounting parts, localized I bulges in the weft cross section at the knots can cause prints (
It is well known that it is necessary to completely eliminate knots from being included in the weft threads and woven into the fabric, as this is directly linked to irregularities in the thickness of the insulating layer of the board.

From this point of view, methods such as Japanese Patent Publication No. 14137/1980, Japanese Patent Publication No. 50895/1982, and 50896/1988 have been proposed. In other words, when the remaining amount of the yarn feeder currently being inserted is low and the time to weave the knot approaches, the loom is stopped in the open state and the weft insertion nozzle is used to insert the weft by a predetermined amount. The idea is to remove the knots by blowing away the weft to the opposite side of the fabric, and then restart the loom.

However, in such a conventional method, the Mars thread is blown away before and after the knot, which is undesirable because it wastes a lot of thread and fluid for blowing waves. Since the weft threads are blown between the opened warp threads, the weft threads and warp threads are easily damaged, and the knots may get caught in the middle, making it difficult to discharge the knotted weft threads.

Furthermore, there is a drawback that the treatment of the yarn blown away to the weft entry side is not reliable, and the structure of the device for carrying out this process is complicated.

(Object of the Invention) This invention was proposed in order to eliminate all the drawbacks of the above-mentioned conventional knot removal method for yarn feeding change in a fluid jet loom. Moreover, it is an object of the present invention to provide a method for removing knots [1] from a yarn feeder in a wave jet type loom, which is mechanically simple and can easily and reliably remove the knot ends.

1. The present invention is based on a fluid injection type A machine equipped with a mechanism for preventing incomplete locking during braking after the loom stop F signal is generated. Examples include the previously proposed device disclosed in Japanese Patent Publication No. 61-10576, and the weft insertion yarn feeding device disclosed in Japanese Patent Application Laid-Open No. 51-64064.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention connects the tail end of a yarn feeder and the yarn end of a succeeding yarn feeder with a knot, and when continuously changing the yarn feed, the knot is removed. After detecting that the yarn has been unwound from the yarn feeder, the loom is stopped until the knot opening advances to the position immediately before weft insertion, and then the knot removing device located between the main nozzle and the woven fabric The loom is operated to remove the knot, and then restart the loom at a predetermined timing.

(Example) Hereinafter, embodiments of this invention will be used.

An apparatus for implementing the method of the present invention includes, for example, a sensor 1 and a control circuit 10, as shown in FIG.

The sensor 1 is, for example, a photoelectric switch having a light emitter 1b and a light receiver 1c at the tip of a horseshoe-shaped frame 1a, and receives light when the thread X located deep inside the frame 1a is unwound across the optical axis 1d. C detects it and outputs it as an electrical signal.

As shown in FIG. 2, the sensor l is set to detect the timing of the edge of the knot Xa between the tail end of the yarn feeder 31a of the yarn feeder stand L (not shown) and the yarn end of the yarn feeder 31b. . That is.

The yarn feeder 31a is installed in a yarn feeder stand so that the yarn X passes through a drum-type weft length measurement and storage device 32 and a weft insertion nozzle 33, and serves as a weft W for weaving a woven fabric C. When all of the yarn X is consumed, the yarn X of the next yarn supplying body 31b is continuously let out as a weft W through the knot Xa, and the sensor 1 detects the passage of this knot.

On the other hand, between the weft insertion nozzle 33 and the weft insertion side end of the woven fabric C, there is a blow nozzle 41 and a cutter 4 facing the weft flight path.
2 and a suction nozzle 43 are provided as main components.

This thread removing device removes the jet from the jet nozzle 4 at a predetermined timing.
Air is ejected from 1 and blown toward the suction nozzle 43 which is performing a suction operation on the tip of the weft W.

Next, explaining the control circuit 1O, the output of the sensor 1 is connected to the set terminal of the flip-flop 12 via the amplifier 11, and the output is connected to the AND gate 13 together with the pick signal 21 from the pick sensor (not shown). has been done. Here, the pick sensor is, for example, a proximity sensor that detects the rotation of the main shaft of the loom, and generates one pulse signal corresponding to each pick operation of the 1F & loom. This pulse signal is then inputted to the computer gamer 13 as a big signal 21.

The output of the AND gate 13 is input to the addition terminal of the counter 14, and the output of the counter 14 is led to the comparator 15 together with the output of the setter 16. The output of the comparator 15 is connected as a command signal 22 via an amplifier 17 to a loom control device and a control circuit for a yarn removing device (not shown). Furthermore, a loom operating signal 23 is inputted to the control circuit 10 from the f17 control device of the loom (not shown), and is sent to the reset terminal of the flip-flop 12 and the counter 14 via an amplifier 18 and a one-shot mono multivibrator 19.
Clear terminal and connected to.

The operation of such a device will now be described.

When the yarn X is paid out as a weft W from the yarn supplying body 31a and the entirety of the yarn supplying body 31a is consumed, the knot r, I leading to.

As a result, the thread X crosses the optical axis 1d of the sensor l, νJ,
The sensor l outputs a signal. Then, this signal passes through an amplifier 11 and sets a flip-flop 12, and the number of subsequent pick operations of the loom (weft insertion operation of the loom) is counted by a counter 14 via an AND gate 13. Since the flip-flop 12 and the counter 14 are reset and cleared by the 11&a operation signal 23, the number of pick operations counted by the counter 14 accurately corresponds to the pick operation of the loom after the end time T of the yarn supply body 31a. It is the number of times.

The content of the counter 14 is compared with the setting content of the setter 16 in the comparator 15, so after the sensor 1 operates and the pick operation is performed a predetermined number of times set by the setter 16, the comparator 15 A signal is output which is used as a command signal 22 via amplifier 17 to stop the #& machine and to start the thread removal device. That is, the yarn supply body 3
When the yarn X of 1a is completely consumed, the loom is stopped after a predetermined number of pick operations set by the setting device 16, and the yarn removing device is activated.

In this case, when the command signal 22 is issued, the loom starts to stop in response, but during the weft insertion period that occurs during this braking, the locking pin 32a is in the locked state. By keeping it on an island, weft insertion is prevented. Further, the weft yarn W is cut at the tip of the weft insertion nozzle 33 by the normal operation of the yarn feeding cutter 42.

After the loom has completely stopped, the loom enters a warp-closed state through a so-called pick-finding operation by reversing the loom, and the thread removing device is then activated at a predetermined timing.

By the way, the number of picks set in the setting device 16 is 11.
It is sufficient to set the number of picks where X a is included in the weft W and woven into the woven fabric C, but it is most preferable to set the number to one bit less. Then, the knot Xa will be By the pick operation, the weft yarn has reached the position where it is woven into the woven fabric AiC, that is, the position immediately before being woven into the woven fabric C, and the amount of discharge of the weft yarn W, which will be described later, can be reduced.

In this way, Il&n is stopped at an angle where the warp shedding is almost closed, and the yarn removal device is activated. During the operation with this yarn removal bag, the weft length measuring and storage device 32 is engaged (F pin 3
2a to release the weft yarn lock +L at the drum H. Then, the operation of the yarn removing device, i.e., the jet nozzle 4
1 and the suction nozzle 43 to pull out the weft W protruding from the tip of the Korean insertion nozzle 33, and forcibly remove the next big weft W including the knot rl X a stored in the weft length measurement storage device 32. to be discharged. and,
At a predetermined timing after this discharge, the weft locking pin 32a is activated to the weft locking state yE', preliminary winding is performed by the rotating yarn guide YG, and the loom is automatically operated at a predetermined timing thereafter. I will restart it. With this restart, the weft yarn W being drawn into the suction nozzle 43 from the weft insertion nozzle 33 is guided to the operating range of the yarn feeding cutter 42 by the action of the guide 47 during the beating process. After beating, the weft yarn W continuing from the weft insertion nozzle 33 to the suction nozzle 43 is cut by the yarn supply cutter 42, and the next weft insertion is performed.

In the above description, the suction nozzle 43 and the jet nozzle 41 are used as the thread removing device, but in order to carry out the method of the present invention, the thread removing device is not limited to this device. Alternatively, a pair of rollers may be provided in place of these nozzles, and the weft W at the tip of the weft insertion nozzle 33 may be pinched and removed while being fed out.

In short, any type of device may be used as long as it can pull the weft W protruding from the tip of the weft insertion nozzle 33 between the weft insertion nozzle 33 and the n cloth edge and pull it out from the weft yarn a1-long storage device 32. That is, for example, the patent application
A defective weft insertion yarn removal device such as that proposed by the applicant in No. 0-089720 or Japanese Utility Model Application No. 61-024086 may be modified and used.

Further, in the case of cutting the weft yarn W connected to the weft insertion nozzle 33 and the suction nozzle 43, the yarn supply cutter 42 that cuts the weft yarn W during beating is used in the explanation, but the present invention is not limited to this. , a dedicated force cover separate from the yarn feeding cutter 42 may be used.

Furthermore, in the apparatus used to carry out the above-mentioned present invention,
At the time of knot removal, the weft W on the weft length measuring and storage device 32 is brought into the unlocked state by the locking pin 32a, and the locking pin is brought into the locked state after a predetermined period of time has elapsed. An unwinding sensor is provided to detect the unwinding of each winding from the weft length measuring storage device 32, and the unwinding signal from this unwinding sensor is counted, and when a predetermined number of windings have been unwound, the locking pin is activated. It goes without saying that 32a may be kept in a locked state.

In the above embodiment, if the loom is stopped with the warp shedding open, high tension is applied to the warp.

Since stop marks occur due to elongation of the yarn, etc., the yarn removal device was operated at an angle where the warp opening was between the ends. If so, the thread removing device may be operated at an angle other than the angle at which the warp threads are shed.

Further, in the above embodiment, the loom is stopped after a predetermined number of start operations after the sensor 1 detects the knot Xa, but the loom may be stopped immediately after the sensor 1 detects the knot [I Further, it may be stopped after a predetermined period of time has elapsed.

(Effects of the Invention) According to the method of the present invention, knots are captured and removed between the cotton insertion nozzle and the end of the woven fabric, so the knots do not enter the warp opening, so unlike the conventional method, knots are removed when the knots are removed. It does not damage the warp threads.

Furthermore, since the weft yarns are not blown away by the air stream when removing knots, there is no wasted consumption of the weft yarns and fluid, which is very advantageous from the standpoint of resource saving and the cost of the woven fabric.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing an example of equipment for carrying out the method of the present invention, and FIG. 3 is a partially enlarged 14th view thereof.

Claims (1)

[Scope of Claims] In a fluid jet loom equipped with a mechanism for preventing weft insertion performed during braking after a loom stop signal is generated, the tail end of a weft yarn feeder and the yarn end of a subsequent weft yarn feeder When continuously changing the yarn feed by connecting the wefts with a knot, the loom is stopped between when it is detected that the knot is unreeled and until the knot advances to the position immediately before weft insertion. , After that, the stored wefts of the weft length measuring storage device are set to an unwindable state, and the yarn removing device located between the main nozzle and the woven fabric is activated to remove the wefts including knots from the weft length measuring storage device, A method for removing knots during a yarn feed change in a fluid jet loom, the method comprising restarting the loom thereafter.