JPS6245757A - Weft yarn treatment in shuttleless loom - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method for processing a weft inserted into a warp shedding in a shuttleless loom immediately before the loom is stopped.

(Prior technology) Shuttleless looms such as jet looms can be expected to have much higher productivity than frame looms, and there has been a noticeable trend in recent years to adopt such high-speed looms. It is a well-known fact that the incidence of weft insertion errors in shuttleless looms is higher than in framed looms. In the event of a weft insertion error, the machine is stopped based on a weft insertion error detection signal from the weft detector, but in high-speed looms, in order to prevent damage to various parts, the machine is stopped after the machine has inertia operated for at least one rotation. Because the machine is stopped, not only the weft yarns that have been inserted incorrectly (hereinafter referred to as erroneous yarns) are reeded and woven into the woven fabric before the machine stops, but also the weft yarns that follow the erroneous yarns are also reeded and reeded. get hit. Therefore, in order to remove a misplaced thread, it is first necessary to reverse the machine and remove the weft inserted during inertia operation, but even if the warp is set to its maximum opening state, the grip of the weft by the warp is not sufficiently released, Weft removal is complicated. Therefore, in combination with this removal work, the work of removing misplaced threads becomes extremely time consuming, which impedes the improvement in productivity required of high-speed looms.

Therefore, the weft insertion during machine inertia operation is prevented, and the weft thread is introduced and gripped between a pair of pressure rollers as disclosed in, for example, Japanese Patent Application Laid-Open No. 59-21757, and the weft thread is operated each time weft insertion is carried out. A method has been proposed in which the cutting function of the cutting device is temporarily stopped to maintain the connection between the missed yarn and the following weft yarn without cutting them, and the pressure roller is rotated to pull out the missed yarn from within the warp opening. According to this method, the weft yarns to be processed are substantially only the erroneous yarns in the warp opening, and the erroneous yarn removal is performed by the rotating operation of the pressure roller, making it possible to shorten the time for erroneous yarn processing.

(Problems to be Solved by the Invention) However, the problem with the weft processing method that has such advantages is the failure to pull out the wrong yarns that are pulled out from within the warp opening, that is, the accident of cutting the wrong yarns during drawing. . Even though the state of grip by the warp threads has been released to some extent, there is a considerable risk of breakage if the mis-threads are given a certain amount of resistance when being pulled out from the warp opening and are pulled out at a high speed. Therefore, it is generally considered that the pulling out speed of the wrong thread is maintained at a low speed to suppress the pulling resistance and prevent the wrong thread from breaking.
This leads to a long processing time for misplaced yarns, which impedes the high productivity that is an advantage of high-speed looms.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, the warp threads are formed in an open state, and the weft threads woven into the woven fabric immediately before the machine stops are released from the weaving state. When the weft is pulled out from the warp opening after being gripped by the gripping means, the speed of pulling out the weft by the pulling-out means is adjusted over time in accordance with the pull-out resistance of the weft.

(Function) That is, when a weft insertion error occurs, the connection between the weft yarn that prevents weft insertion and the error yarn is maintained by temporarily stopping the cutting function of the weft yarn cutting device that is activated every time the weft insertion occurs. In the method of preventing weft insertion of a weft yarn following a misplaced yarn, the weft yarn whose weft insertion is prevented is gripped by, for example, a suction gripping means, and the gripped weft yarn is transferred to a weft pull-out means comprising, for example, a pair of pressing rollers. Then, by forming a warp opening state and releasing the mis-thread grip, the pulling means is operated to start pulling out the mis-thread connected to the weft whose weft insertion has been prevented from inside the warp opening.

Although the grip on the warp threads has been released to some extent, in the early stage of drawing when the drawing resistance is relatively large, by maintaining this drawing speed at a low speed, the drawing tension of the misplaced threads is suppressed, and breakage of the misplaced threads is avoided. As the missed yarn is pulled out, the engagement area between the warp and the missed yarn decreases, and the resistance to pull out the missed yarn decreases.

Then, by increasing the operating speed of the pulling means at an appropriate time after the start of pulling out and increasing the speed of pulling out the wrong yarn, it becomes possible to shorten the time required for removing the wrong yarn. At this time, since the pull-out resistance of the miss thread is lowered, the pull-out tension of the miss thread does not become greater than that at the initial stage of drawing, and there is no fear of yarn breakage.

Even when a missed yarn and a weft yarn that has been prevented from being inserted into the weft that follows are cut, for example, when the missed yarn is separated from the fabric front by a weft separation device and the missed yarn is pulled out from within the warp opening by an appropriate pulling means, Yarn breakage is avoided by adjusting the withdrawal speed over time and maintaining the withdrawal tension of the erroneous yarn within a proper range.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

The weft yarn Y passing through a weft length measuring and storage device (not shown) is guided into the weft insertion main nozzle 2 on the slay 1 which is reciprocally oscillated, and is guided through the weft guide holes of the weft yarn guide members 3 arranged in parallel on the slay 1. 3a, the main nozzle for weft insertion 2 emits the weft in synchronization with the weft insertion timing. When the weft yarn Y ejected from the main weft insertion nozzle 2 is inserted normally and reaches the end of the woven fabric W on the side opposite to the main nozzle,
While the slay 1 moves forward toward the woven fabric W, the weft yarn Y escapes from the weft guide hole 3a through the slit 3b, and is beaten and woven into the woven fabric W. A cutter 4 is provided near the edge of the woven fabric W on the side of the weft insertion main nozzle 2.
The weaving operation continues thereafter.

If a weft insertion error occurs such that the weft Y does not reach the end on the side opposite to the main nozzle, a weft detection (not shown) provided in the slit 3b of the weft guide member 3 located corresponding to the vicinity of the end is detected. The machine (consisting of light emitting and receiving devices placed opposite each other across the slit 3b) detects a weft insertion error,
The machine is stopped based on a weft insertion error detection signal from the detector.

After the weft insertion error detection signal (also a machine stop signal) is issued, the machine rotates approximately once due to inertia and then stops. That is, when a weft insertion error occurs, a weft insertion error detection signal is issued while the main weft insertion nozzle 2 advances toward the woven fabric W from the most retracted position shown by the solid line in FIG. After Y° is beaten onto the woven fabric W, the weft inserting main nozzle 2 further reciprocates and stops at the most retracted position. As shown in FIG. 3, the cutter 4 consists of a fixed blade 6 and a movable blade 7 mounted on a fixed shaft 5, and a cam lever 9 and a movable blade 7 that are swung by a cam 8 that is rotated in synchronization with the machine base. are operatively connected via link 10,
The cutter 4 performs a cutting operation every time the weft is inserted. Cam lever 9
An air cylinder 11 is disposed near the cutter 4, and its drive rod 11a abuts against the cam lever 9 to maintain the cutter 4 in an open state. The air cylinder 11 is operated based on the weft insertion error detection signal to prevent the cutter 4 from cutting and separating the error yarn Y'.

A weft processing device 12 is disposed near the most retracted position of the main nozzle for weft insertion 2, and the weft yarn Y1 ejected from the main nozzle for weft insertion 2 following the missed yarn Y' is transferred to the main nozzle for weft insertion 2. It is designed to be cut from the body and removed by suction.

To explain this weft processing device 12 in detail, a fan-shaped blocking body 15 provided with a mesh 14 is provided at the tip of a drive shaft 13 which is operatively connected to a drive mechanism (not shown).
A suction pipe 17 connected to a suction device 16 that is activated based on the weft insertion error detection signal is disposed near the blocking body 15. A mounting arm IS is installed at the bottom of the interrupter 15.
The arm 15a is bent toward the weft inserting main nozzle 2, and a thin plate-shaped cutting body 18 is fixed to the arm 15a. On the other hand, a support bracket 19 is attached to the upper surface of the tip side of the suction pipe 17, and a cutting board 20 made of synthetic resin is fixed to the lower surface of the bracket throat 19. The blocking body 15 is always in the retracted position shown by the chain line in FIG. 3, and in this state, the upper end blade portion of the cutting body 18 is in contact with the lower surface of the cutting board 20. A guide piece 15b for guiding the suction airflow by the suction pipe 17 is formed at the upper edge of the distal end of the blocking body 15 to be bent toward the weft insertion main nozzle 2 side.

The base end of the suction pipe 17 is bent and extended upward, and a second suction pipe 21 connected to a suction device (not shown) is disposed above the base end of the pipe 17. , inside the pipe 21 there is a light emitting/receiving weft detector 27.
is installed.

Both suction pipes 17. A servo motor 22 is disposed on the side in the weft insertion direction between '21, and a drive roller 23 fixed to its drive shaft 22a is disposed near both suction pipes 17 and 21. An air cylinder 24 is disposed on the side perpendicular to the weft insertion direction between the two suction pipes 17 and 21, and a driven roller is disposed between the two-pronged support arm 24b fixed to the tip of the drive rod 24a. 25 is rotatably supported. As shown in FIG. 1, both rollers 23 and 25 are always in a separated state, and when the electromagnetic valve 26 that controls the supply of compressed air to the air cylinder 24 is energized, the drive rod 24a is protruded and the driven roller 25 is moved. It is brought into pressure contact with the drive roller 23. Servo motor 2
2 and the electromagnetic valve 26 are operated based on a weft detection signal from a weft detector 27.

As shown in FIG. 4, the electrical signal value corresponding to the rotation speed of the servo motor 22 is fed back from the motor 22 to the comparator 28, and the electric signal value corresponding to the set rotation speed input from the speed setting device 29 is fed back from the motor 22 to the comparator 28. The target signal value and the signal value are compared, and as a result, an appropriate speed command is given to the servo motor 22 from the speed controller 30. The speed setter 29 has a built-in timer, and the speed set in the speed setter 29 is switched from a low speed v1 to a high speed V2 at a predetermined time as shown by speed curve C in FIG. It's starting to look like this.

A plurality of weft separation devices 31 are disposed above the woven fabric W from the front W1 to the warp T, and a weft separation member 31a is rotatably attached to the lower end of the weft separation device 31 via a leaf spring 32. There is. The weft separation member 31a is connected to the weft detector 2
Based on the weft detection signal No. 7, it is rotated from the retracted position shown by the chain line in FIG.
It is designed to be separated from Orimae W1 by hooking it on.

The weft separation member 31a is configured to return to the retracted position when the weft detection signal from the weft detector 27 disappears, but after the weft separation operation, the weft separation member 31a
It may be configured to automatically return to the retracted position without depending on the weft detector 27.

Now, when a weft insertion error occurs, the erroneous yarn Y'' is beaten, but the air cylinder 11 is activated by the weft insertion error detection signal, and the cutter 4 is held in the open state by protruding the drive rod lla. Therefore, the missed yarn Y° is not cut and separated, and returns to the most retracted position side while being connected to the main nozzle 2 for weft insertion.The following weft yarn Y1 is cut from the main nozzle 2 for weft insertion during the inertia operation of this machine. is ejected.

At this point, the drive mechanism and suction device 16 (not shown) are operated based on the weft insertion error detection signal, and the mesh 14 of the blocking body 15 is moved to the weft blocking position shown by the solid line in FIG. 3 with the drive shaft 13 as the center. It is rotationally arranged.

The period in which the blocking body 15 is placed at the weft blocking position is maintained until the end of the injection of the weft yarn Y1, and the weft yarn Y1 injected from the main nozzle for weft insertion 2 passes the injection fluid in the weft insertion direction by the mesoche 14. Uke can be stopped. The weft yarn Y1 whose weft insertion has been prevented is sucked by the suction vibrator 17,
The suction is further introduced from the same vibrator 17 to the second suction pipe 21 side. After the injection of the weft yarn Y1 is finished, the machine base further rotates due to inertia and stops just before beating the reed. Thereafter, the weft insertion main nozzle 2 reaches the most retracted position by manually or automatically rotating forward or reverse, and the machine is stopped again. In other words, the warp threads T are in an open state, and the gripping state of the misplaced thread Y° by the warp threads T is released. During this time, the cutting function of the cutter 4 is also canceled, and cutting of the erroneous yarn is avoided.

Further, by operating the weft separation device 31 based on the weft insertion error detection signal, the weft separation member 31a is rotated from the retracted position indicated by the chain line in FIG. 1 to the solid line position, and the error yarn Y'
is separated from Orimae W1.

When the machine is stopped, the blocking body 15 rotates back from the weft blocking position shown by the solid line in FIG. , the weft Y1 is cut and separated from the weft inserting main nozzle 2. At this time, the weft yarn Y1 and the miss yarn Y' are not cut, and the miss yarn Y' remains connected to the weft yarn Y1.

The weft yarn Y1 that has been sucked and introduced into the second suction vibrator 21 via the first suction vibrator 17 is detected by the weft yarn detector 27, and the servo motor 22 and the electromagnetic valve 26 are excited by this detection signal. Therefore, as shown in FIG. 2.3, the driven roller 25 is pressed against the drive roller 23, the weft Y1 is held between both rollers 23.degree. 25, and the rotation of the drive roller 23 pulls the weft Y1 upward. The missed thread Y', which has been released from the grasping state by the warp thread T by pulling up the weft thread Y1, is transferred to the woven fabric W in order from the main nozzle 2 side for inserting cotton.
be separated from.

At the initial stage of separation of the misplaced yarn Y'', the servo motor 22 is rotated at a low speed Vl as shown in FIG. be exposed. That is, even though the grasping state by the warp threads T is released, the pulling tension of the misplaced yarn Y°, which exhibits a certain amount of pulling resistance, is suppressed, and the misplaced yarn Y′ is gradually pulled out from within the warp opening without being cut.

After a predetermined period of time has passed since the servo motor 22 started operating,
By the operation of the timer in the speed setter 29, the rotational speed of the servo motor 220 is switched from low speed (1) to high speed (2) as shown in FIG.

That is, for example, the missed thread Y is moved to the position shown by the chain line in FIG.
When Y' is separated from the facing W1 of the woven fabric W and the pull-out resistance of the miss yarn Y' is considerably reduced, the rotational speed of the servo motor 22 is switched from low speed (1) to high speed (2). Since the pull-out resistance of the wrong yarn Y'' is considerably reduced, even if the wrong yarn Y' is pulled out from the warp shedding at high speed, the pull-out resistance of the wrong yarn Y'' is greater than the pull-out resistance when the servo motor 22 rotates at low speed. It will never be. Therefore, the erroneous yarn Y' can be pulled out from within the warp opening at high speed without fear of being cut, and the erroneous yarn Y' can be pulled out and removed from the warp opening in a short time.

When all the misplaced yarns Y' are pulled out from inside the warp opening and removed by suction by the second suction pipe 21, the weft separation member 31a is returned to the retracted position, and the air cylinder 11, suction device 16, and suction device (not shown) are removed. The device and the electromagnetic valve 26 (therefore, the air cylinder 24) return to their initial state.

In this embodiment, the weft separation device 31 is used to loosen the grip of the misplaced yarn Y' by the warp T. However, depending on the type of weft, for example, a relatively strong weft, the weft separation device 31
Simply form the warp opening without using
It is also possible to pull out the miss thread Y" while the weaving state of "Y" is released.

In addition, according to this embodiment, the type of warp or weft, such as the amount of fuzz, and the number of wefts (i.e., weaving density)
It is possible to change the set speed in the speed setting device 30 or to set the speed to be changed continuously depending on the speed setting device 30, and it is possible to cope with changes in the pull-out resistance of the miss yarn Y' depending on the yarn type or weaving density.

In addition, to prevent weft insertion during inertial operation before the machine stops, the weft is not ejected from the main nozzle for weft insertion by, for example, preventing the weft from being sent out from the length measuring device, and after the machine stops, the main nozzle for weft insertion is The treatment may be performed by blowing it out from a nozzle.

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

The present invention is, of course, not limited to the above-mentioned embodiments. For example, even when a missed yarn and a following weft yarn are cut and separated, the missed yarn is grasped and pulled out from within the warp opening by appropriate weft gripping means and pulling means. It is possible to apply the present invention to a weft processing device, and to embody the present invention in a loom that prevents weft insertion using a weft locking body for weft control in a winding-type weft length measuring and storage device, and to Showa 58-22
It is also possible to embody the present invention in a weft pulling mechanism in a weft thread processing device as disclosed in Japanese Patent No. 0856.

Effects of the Invention As detailed above, the weft processing method of the present invention has the advantage that the weft threads woven into the fabric can be efficiently pulled out from within the warp opening without cutting them immediately before the machine stops. It has a great effect.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention; FIG. 1 is a plan view of the road body, FIG. 2 is a plan view of the road body showing changes from FIG. 1, FIG. 3 is a side view of main parts, and FIG. FIG. 4 is a block diagram showing the operating circuit of the No.-Bomoke, and FIG. 5 is a graph showing the rotational speed of the servo motor. Weft processing device 12, blocking body 15, suction pipe 17.2 as gripping means, motor 22 and rollers 23.25 as pulling means, miss yarn Y゛, weft yarn Y1゜

Claims (1)

[Claims] 1 By forming an open state of the warp threads, the weft state of the weft threads woven into the fabric immediately before the machine stops is released, and after the weft threads that have been released from the weave state are gripped by the gripping means, the same weft threads are removed from within the warp thread opening. A weft processing method in a shuttleless loom, in which the weft drawing speed by a drawing means is adjusted over time according to the drawing resistance of the weft when drawing the weft.