JPH0518937B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a weft processing device for processing the weft ejected from a main nozzle immediately before the machine is stopped.

(Prior Art) In recent years, there has been a marked trend toward higher speeds of looms for the purpose of improving the productivity of looms, and there is a tendency for fluid jet looms that meet this purpose to be widely used. In this fluid injection type loom, the weft to be inserted is measured in advance to a predetermined length and stored, and this predetermined amount of stored weft is injected from the main nozzle by jetting fluid in synchronization with the weaving timing. The weft is inserted. In general, the incidence of weft insertion mistakes in fluid jet looms is higher than in shuttle looms, but once a weft insertion error occurs, it is necessary to change the loom to maintain the quality of the woven fabric. It is necessary to stop and correct the weft insertion error. The loom is stopped based on the weft insertion error detection signal from the weft detection device, but in order to prevent damage to various parts of the high-speed loom, the loom is stopped after the loom has inertia operated for at least one revolution, so the main nozzle If a mechanical valve that opens and closes in synchronization with the rotation of the machine is used as a valve to control the fluid supply to the machine, the weft yarn that has been inserted incorrectly (hereinafter referred to as "mistake yarn") will be reeded before the machine stops. Not only are the weft threads that are beaten and woven into the woven fabric, but even the weft threads that follow the missed threads are inserted and reeded. Therefore, when reversing the machine and releasing the grip of the misplaced thread by the warp threads to remove the misplaced thread, the weft thread that has been beaten following the misplaced thread must first be removed, but the warp threads must be opened to the maximum opening. Even if the weft is held in the weft state, the grip of the weft by the warp is not sufficiently released, so it is not easy to remove the weft, and the removal work becomes extremely complicated.
Combined with the subsequent work to remove the misplaced threads, this causes the loom to stop for a long time, impeding improvements in the productivity of the loom.

Even when an electromagnetic valve is used instead of the mechanical valve mentioned above as a valve to control the fluid supply to the main nozzle, fluid injection from the main nozzle is stopped because it is necessary to keep the amount of weft yarn stored constant after the machine is stopped. Alternatively, the weft yarn following the missed yarn may be inserted without being able to weaken the weft yarn, resulting in the same problem as described above.

Furthermore, if the warp threads are cut during weaving, or if the loom is artificially turned off, the loom will stop after making one or more rotations as described above. During this inertial operation state, the weft threads are woven into the fabric, but since the loom is in a deceleration state, the beating state of the weft threads is different from that of other weft threads, resulting in defects such as weaving steps in the fabric.

Therefore, it is desirable to prevent the weft insertion of the weft yarn that is inserted subsequent to the above-mentioned erroneous yarn, or of the weft yarn that is inserted during the inertial operation. Therefore, conventionally, as shown in Japanese Patent Application Laid-Open No. 59-15541, a blocking plate is protruded on the weft path in front of the main nozzle, and the weft yarn following the miss yarn is blocked and guided by the blocking plate while entering the suction pipe. A weft processing device has been proposed in which a cutter is provided on a bracket for supporting a suction pipe to cut and separate the cut off weft from a main nozzle. However, in this weft processing device, since the cutter is made to protrude forward from the tip of the main nozzle in order to cut the weft, the weft is scattered by the jetted fluid that is disturbed by the blocking plate, and the weft is not cut by the cutter. There was a defect that it got caught.

In order to eliminate such defects, the cutter is placed behind the tip of the main nozzle when the cutter is not in operation, and when the cutter is in operation when the machine is stopped, the cutter is moved forward from the tip of the main nozzle to cut the weft yarn. However, in a loom in which the main nozzle is mounted on the sleigh, the member that drives the cutter is subject to severe wear due to the rocking motion of the slay, making it practically unusable.

Further, in a weft processing device employing a blocking plate that almost completely blocks the jetted fluid as described above, there is a problem in that the suction pipe must be provided with a strong suction function.

(Problems to be solved by the invention) Namely, there are problems such as poor weft suction due to weft scattering when the weft is interrupted, the need for a strong suction function in the suction pipe, and the above-mentioned cutter that performs reliable cutting with a simple mechanism. The problems existing in the prior art are the object of the present invention to be solved, and by solving these problems, it is possible to reliably insert the weft yarn without any trouble when restarting the machine.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a blocker for receiving and stopping the weft ejected from the main nozzle immediately before the machine stops is installed in the weft path in front of the main nozzle. A retracted position spaced apart from above and a blocking position on the weft path are provided so as to be capable of reciprocating cutting, and the blocking body is provided with a fluid permeable part that allows the jet fluid to pass through in the weft insertion direction. is provided with a suction pipe for suctioning the weft received by the blocking body, one cutting body is provided on the blocking body side, and the other cutting body is provided on the suction pipe side, and the blocking position of the blocking body is The cutting body is arranged at a position where the cutting body on the blocking body side hooks the weft thread connected from the main nozzle to the suction pipe and engages with the cutting body on the suction pipe side when the cutting body returns from the main nozzle to the retracted position. Adopted.

(Function) In other words, the blocking body equipped with a fluid permeable part such as a mesh is always at the above-mentioned retracted position, and when the machine stops based on a machine stop signal such as a weft insertion error detection signal, the blocking body is projected to a blocking position on the weft path in front of the main nozzle. Through this operation, the weft ejected from the main nozzle is received by the fluid transmission section, and the ejected fluid passes through the transmission section in the weft insertion direction. Therefore, scattering of the weft yarns due to turbulence of the jetted fluid is eliminated, and the same weft yarns are reliably sucked by the suction pipe disposed near the blocking body. Then, when all the weft yarns ejected from the main nozzle are blocked from being inserted, the blocking body returns to the retracted position, and along with this returning operation, the cutting bodies provided on the suction pipe side and the blocking body side, respectively. A weft cutting operation is performed, and the weft is cut and separated from the main nozzle and removed by suction through the suction pipe.

(Embodiment) Hereinafter, an embodiment embodying the present invention will be described based on the drawings. The weft yarn Y supplied from the weft supply section 1 is used as a length measuring roller mechanism driven in synchronization with the rotation of the machine base. When the weft gripper 5, which is opened and closed in synchronization with the weft insertion timing of the loom, is closed, the weft Y passes through the slit 6a. It is ejected and stored in 6 directions of the storage pipe. The feed rollers 2 and 3 are separated by a drive mechanism (not shown) such as an air cylinder or an electromagnetic solenoid when the machine is stopped, so that the length measurement function is eliminated. The weft yarn Y passing through the guide hole 7 and the gripper 5 is guided into a main nozzle 9 mounted on a slay 8 that swings back and forth, and the main nozzle 9 is operated in synchronization with the weft insertion timing.
The wefts are injected and inserted into the weft guide holes 10a of the weft guide members 10 arranged in parallel on the sled 8.

When the weft yarn Y ejected from the main nozzle 9 is inserted normally and reaches the end of the woven fabric W on the side opposite to the weft insertion side, the weft yarn guide The weft thread escapes from the guide hole 10a of the member 10 through the slit 10b, and the weft thread is driven into the front of the woven fabric W by the reed 11 on the slay 8, and is woven into the woven fabric W. The material is cut by a cutter 12 provided near the end of the material on the nozzle side. Then, the subsequent weaving operation is continued.

If a weft insertion error occurs in which the weft yarn Y does not reach the fabric end on the opposite side of the weft insertion, a weft detector (not shown) provided on the weft guide member 10 located near the fabric edge is detected. detects a weft insertion error, and the machine is stopped based on a weft insertion error detection signal from the detector. The weft detector is composed of light emitting/receiving elements arranged opposite to each other across the slit 10b of the weft guide member, and emits a weft insertion error detection signal when the weft does not pass through the slit 10b during beating.

After the weft insertion error detection signal (also a machine stop signal) is issued, the machine rotates approximately once due to inertia and stops. That is, when a weft insertion error occurs, the weft insertion error detection signal is issued while the reed 11 moves forward in the direction of the arrow from the most retracted position shown by the solid line in FIG.
After being beaten by the reed 1 and cut by the cutter 12, the reed 11 returns to the most retracted position,
Furthermore, it moves forward again and stops just before the reed beating. During this inertial operation, the weft processing device 13 provided near the main nozzle 9 is activated based on the weft insertion error detection signal, and the weft yarn Y1 ejected from the main nozzle 9 following the error yarn Y' is transferred to the main nozzle. It is designed to be cut and separated from 9 and removed by suction.

To explain this weft processing device 13 in detail, a fan-shaped blocking body 1 is provided with a mesh 16 at the tip of a drive shaft 14 which is operatively connected to a drive mechanism (not shown).
5, and a suction pipe 17 connected to a suction device (also not shown) is disposed near the main nozzle 9. A cutting blade 18 made of a thin metal plate serving as a cutting body is removably fixed to a mounting arm 15a bent toward the main nozzle 9 at the lower part of the blocking body 15. A cutting board 20 made of synthetic resin as a cutting body is removably fixed to the lower surface of a support bracket 19 fixed to the upper edge of the tip end of the pipe 17. Note that a guide piece 15b for guiding the suction airflow by the suction pipe 17 is provided on the upper edge of the distal end side of the blocking body 15, and the guide piece 15b is attached to the main nozzle 9.
It is bent toward the side. The arrangement positions of the cutting blade 18 and the cutting board 20 are such that when the blocking body 15 in the blocking position returns to the retracted position, the cutting blade 18 moves from the main nozzle 9 to the suction pipe 17. It is set so that the weft yarn Y1 connected to the cutting board 20 is hooked and engaged with the cutting board 20.

The blocking body 15 is always in the retracted position shown in FIG. 4, and in this state, the upper end of the cutting blade 18 is in contact with the lower surface of the cutting board 20. Then, based on the weft insertion error detection signal, the drive mechanism (not shown) is driven, and the suction device (not shown) is also activated, and the mesh 16 of the blocking body 15 is moved around the drive shaft 14 as shown in FIG. The main nozzle 9 is rotatably arranged on the weft path in front of the main nozzle 9. During the period when the blocking body 15 is placed at the weft blocking position shown in FIG.
The weft Y1 ejected from the main nozzle 9 is received by the mesh 16 while passing the ejected fluid in the weft insertion direction. Therefore, the jetted fluid is not disturbed by the blocking body 15, the weft yarn Y1 is received at substantially the same portion on the mesh 16, and the weft yarn suction by the suction pipe 17 is performed smoothly. In this state, the cutoff blade 18 is separated from the cutting board 20 by a distance larger than the diameter of the injection port of the suction pipe 17, and there is no fear that the weft Y1 will be caught by the cutting blade 18 when the weft Y1 is sucked.

When the injection of the weft yarn Y1 from the main nozzle 9 is completed, the blocking body 15 rotates back from the blocking position shown in FIG. 5 to the retracted position shown in FIG. The cutting blade 18 hooks the weft yarn Y1 connected between the nozzle 9 and the suction pipe 17 and slams it against the lower surface of the cutting board 20, and as shown in FIG. It is cut and separated from the main nozzle 9 and removed by suction into the suction pipe 17.
Since this cutting mechanism performs the weft cutting operation by the return operation of the interrupter 15, the cutter drive mechanism such as an air cylinder or electromagnetic solenoid that is conventionally employed is unnecessary, and the mechanism is extremely simple. There is.

After the cutoff body 15 returns to the retracted position and the weft Y1 is cut, the suction function in the suction pipe 17 is stopped, but this function may be stopped at the same time as the weft thread cutting or until the machine is restarted. It is also possible to do it at a predetermined time.

After the machine has stopped, the feed rollers 2 and 3 are separated by an air cylinder or solenoid (not shown), the length measurement function is canceled, the machine is reversed by a predetermined amount, and the reed 11 is stopped at the most retracted position shown by the solid line in Figure 2. However, in this state, the erroneous yarn Y' is separated from the woven fabric W. After processing this error yarn, the loom is reversed by a predetermined amount, stopped at the rotational position most suitable for restarting, the length measuring function of the length measuring roller mechanism is restored, and the loom is restarted. Insert the wrong thread
This is carried out immediately before weft insertion at Y′.

Although this embodiment has referred to the stoppage and restart of the machine due to the occurrence of a weft insertion error, the above-described weft suction process is of course performed also in the case of stoppage and restart of the machine due to other reasons.

In addition, in the present invention, the fluid permeable portion may be formed by providing a large number of small holes in the blocking plate other than the mesh.

Effects of the Invention As detailed above, according to the weft processing device of the present invention, the weft thread ejected from the main nozzle immediately before the machine stops is prevented from being inserted, and the same weft thread can be reliably suctioned even with a low suction force. In addition, the cutting body has a simple structure that does not require any driving source, and has an excellent effect of reliably cutting the weft yarn without malfunction or failure.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a schematic plan view showing the vicinity of a length measuring device and a weft inserting device, FIG. 2 is a side view, and FIG. 3 is a modification of FIG. Figure 4 is a schematic plan view showing changes; Figure 4 is a side view of main parts showing the weft processing device; Figure 5 is a side view showing changes from Figure 4; Figure 6 is a partially broken main part of the weft processing equipment. FIG. Main nozzle...9, weft processing device...13, blocking body...15, mesh as a fluid permeable part...16,
Suction pipe…17, cutting blade as a cutting body…1
8. Cutting board also serves as a cutting body... 20. Weft thread...
Y1.

Claims (1)

[Claims] 1. A blocking body for catching the weft ejected from the main nozzle immediately before the machine stops is provided so as to be able to cut back and forth between a retracted position spaced from the weft path in front of the main nozzle and a blocking position on the weft path, The blocking body is provided with a fluid permeable part that allows the jet fluid to pass through in the weft insertion direction, and a suction pipe for sucking the weft received by the blocking body is disposed near the blocking body. One cutting body is provided on the blocking body side and the other cutting body is provided on the suction pipe side, and when the blocking body returns from the blocking position to the retracted position, the cutting body on the blocking body side connects from the main nozzle to the suction pipe. A weft processing device for a fluid jet loom, characterized in that the cutting bodies are respectively disposed at positions where the wefts are hooked and engaged with the cutting bodies on the suction pipe side.