JPH062245A - Method for removing defective yarn in picking - Google Patents

Abstract

PURPOSE:To carry out the proper removing operation by sensing whether weft yarn is pulled through a yarn guide or not in the initial stage for pulling the loopy weft yarn inserted into a shed to the side of the yarn feed in removing defective picking yarn. CONSTITUTION:In an air jet loom, defective picking occurs and a loom is stopped. The loom is then reversely rotated to pick the end of defective weft yarn (1a) in its state connected to weft yarn 1 in a main nozzle. The weft yarn 1, unwound from a length measuring and storing device and having a length required for the treatment is then inserted into a warp yarn shed in the folded back form of a hair pin by the jetting action of the nozzle. A pin- shaped weft yarn guide 20 equipped with an optical type or a pressure type yarn sensor 36 is subsequently admitted into the loop and the loopy weft yarn is then pulled to the side of the yarn feed. In its initial stage, whether the defective yarn (1a) is pulled through the yarn guide 20 or not is sensed from the presence of a yarn signal from the yarn sensor 20. The removing operation is properly set according to the sensing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of pulling and removing a defective yarn in an opening from a yarn supplying side when a weft insertion defect occurs.

[0002]

[Prior Art and Problems Thereof]
According to the invention of 418684, in the same opening as the defective yarn,
A method is proposed in which weft yarns connected to defective yarns are inserted in a loop shape, a weft yarn guide is inserted in the loop of the weft yarns, and then the weft yarns are pulled from the yarn supplying side to remove the defective yarns.

According to the above technique, the traction force effectively acts as a force for separating the defective yarn from the cloth fell, but the weft yarn guide may not be inserted in the loop of the weft yarn. In that case, the removing operation is continued at the normal traction speed. As a result, the defective yarn cannot be effectively separated from the weave, and yarn breakage occurs. Therefore, stable removal operation cannot be expected. Further, in consideration of the case where the weft thread guide is not inserted correctly, it is possible to set the removal speed to a low value in advance so that thread breakage does not occur and to pull the weft thread. The longer the loom, the lower the operating rate of the loom.

As described above, according to the above-mentioned defective yarn removing method,
Since the weft thread pulling force effectively acts as a force to pull the defective thread away from the weave, it has the advantage of increasing the weft thread pulling speed and shortening the removal operation time, but on the other hand, the weft thread guide is inserted in the weft thread loop. If not, the advantages of the defective yarn removing method could not be fully exerted.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to perform a proper removing operation depending on the correspondence between the loop-shaped weft thread inserted into the opening and the weft thread guide which should be present inside the loop-shaped weft thread. It is to make it correspond.

[0006]

According to the present invention, when a weft insertion defect occurs, the defective yarn is kept in a state of being connected to a main nozzle, and after the defective yarn is discharged, the weft yarn is looped into an opening. The weft thread guide inside the loop-shaped weft thread, and pulling the defective thread from the yarn feeding side through this weft thread guide, the defective thread is pulled through the weft thread guide in the initial stage of the removing operation. If the defective thread is pulled through the weft thread guide, the normal removal operation is continued, and if the weft thread is not pulled through the weft thread guide, it is determined that there is an abnormality in correspondence between the two. Judge and pull the weft thread only at a low speed, or pull the weft thread in the looped part at a high speed, and then pull the defective thread at a low speed or stop the removal operation,
Alternatively, the defective yarn is removed by jetting from the sub nozzle or suction from the opposite yarn feeding side.

[0007]

1 to 6 show a sequence of defective yarn removing operations in relation to a weft insertion movement. In this embodiment, in the weft thread pulling process, the weft thread is pulled at a low speed until the weft thread contacts the weft thread guide, and after the weft thread contacts the weft thread guide, the weft thread is pulled at a high speed. When the weft thread guide is in the weft thread loop, the removal operation is performed at the above-mentioned predetermined speed, and when it is not in the loop, that is, when it is abnormal, the whole process is performed at low speed. There is.

The weft yarn 1 is supplied from the yarn feeder 2, and the length required for weft insertion of at least one pick is measured by a drum type or roller length measurement / air storage type length measurement storage device 3, and It has been stored until the time of insertion.

At the time of weft insertion, the length measurement storage device 3 unwinds the length-measured weft yarn 1 to supply it to the main nozzle 4 on the yarn feeding side. At this time, the main nozzle 4 injects the weft insertion fluid to insert the weft thread 1 passed through the inside of the main nozzle 4 into the opening 6 of the warp thread 5 together with the weft insertion fluid. In the weft insertion process, if necessary, a large number of sub-nozzles 9 are in the flight direction of the weft thread 1, and the auxiliary fluid for weft insertion is jetted to make the weft thread 1 in flight the weft insertion direction. To help.

This weft insertion state is detected by the weft thread feeler 7 on the arrival side of the weft thread 1, that is, on the counter-feed side. After the weft feeler 7 detects the front end of the weft yarn 1 and confirms the correct weft insertion state, the yarn feeding cutter 8 is provided between the main nozzle 4 and the yarn end on the yarn feeding side of the woven fabric 10 after the weft insertion. By cutting the weft thread 1, the weft thread 1 after weft insertion is separated from the weft thread 1 inside the main nozzle 4. After that, the weft thread 1 inside the opening 6 is driven into the cloth fell 12 by the repulsion movement of the reed 11.

When a weft insertion failure occurs during such weft insertion, as shown in FIG. 1, the weft thread feeler 7 detects the state of the weft insertion failure and generates a weft stop signal. The device 13 immediately stops the loom, stops the unwinding operation of the weft yarn 1 in the stored state on the length measuring and storage device 3 side, sets the yarn feeding cutter 8 in the inoperative state, and then completes the operation of the loom. By waiting for the stop and reversing the loom, the defective yarn 1a is exposed at the cloth fell 12 and is in a so-called state. In this way, the defective yarn 1a is brought into the spouting state while being connected to the weft yarn 1 inside the main nozzle 4.

After that, as shown in FIG. 2, the suction nozzle 14 and the plurality of auxiliary nozzles 25 enter into the opening 6 of the warp yarn 5 to start the suction operation and the jetting operation. At this time, the sub nozzle 9 also starts ejection. Auxiliary nozzle 2
As shown in FIG. 7, the direction of 5 is set in the jetting direction along the warp yarn 5 from the reed 11 to the cloth fell 12, but is preferably set somewhat toward the downstream side in the weft insertion direction. To be done.

As shown in the figure, the suction nozzle 14 is, for example, C-shaped, has a suction port 18 at its tip, and is rotatably supported by a horizontal fulcrum shaft 16 at the other end. It can be operated by the air cylinder 17, and by rotating from the lower position to the upper position during the suction operation, the suction port 18 is opposed to the main nozzle 4 on the arrival path of the weft thread 1. In addition, the auxiliary nozzle 2
Similarly to the sub-nozzle 9, 5 is fixed to the sley 15 and the like.

Next, since the length measuring and storing device 3 unwinds the weft yarn 1 having a length necessary for yarn processing, the weft yarn 1 in the unwound state is
By the jetting operation of the main nozzle 4 and the sub nozzle 9, the warp yarn 5 is inserted into the opening 6. As a result,
As shown in FIGS. 2 and 3, the newly inserted weft yarn 1 and the defective weft yarn 1a with poor weft insertion are Z-shaped in plan view inside the opening 6. At this time, the weft yarn 1 on the defective yarn 1a side moves toward the cloth fell 12 and the weft yarn 1 on the main nozzle 4 side moves away from the cloth fell 12 by the ejection in the separating direction by the sub nozzle 9 and the auxiliary nozzle 25. Therefore, the weft yarn 1 forms a larger U-shaped loop inside the opening 6 while being connected to the defective yarn 1a from the loop tip.

Even at this time, the suction nozzle 14 is
By continuing to suck the tip of the U-shaped bent portion of the newly inserted weft thread 1, the bent portion is held in the U-shaped loop. In this way, the weft thread 1 is looped inside the opening 6 of the warp thread 5 due to the newly inserted portion, and remains connected to the weft thread 1 inside the main nozzle 4 at one end, and The end portion is connected to the defective yarn 1a. The auxiliary nozzle 25 is
Insert the weft thread 1 into the opening 6 of the warp thread 5 and
It may be operated after the tip of the suction nozzle is sucked into the suction port 18 of the suction nozzle 14.

When the front end of the weft thread 1 is sucked into the suction port 18 of the suction nozzle 14, a sensor 19 provided inside the suction port 18 confirms the retracted state of the weft thread 1. After this confirmation, as shown in FIG. 3, the pin-shaped weft thread guide 20 enters the inside of the opening 6 from above or below the warp thread 5 and enters into the loop of the loop-shaped weft thread 1.
At this point, the main nozzle 4, the sub nozzle 9, the suction nozzle 14, and the auxiliary nozzle 25 stop the ejection operation or the suction operation.

The weft thread guide 20, as shown in FIG.
The operation unit 23 such as an air cylinder is supported so as to be vertically movable, and enters the opening 6 from the standby position when the defective yarn 1a is removed. If necessary, the weft thread guide 20 is connected to the drive unit 24, and in the process of pulling out the weft thread 1 and the defective thread 1a, it vibrates in the warp or weft direction as a traction assist motion, or By rotating the defective yarn 1a in the pulling direction of the defective yarn 1a, separation of the defective yarn 1a from the cloth cloth 12 is promoted, and the pulling force of the removing device 21 is assisted by the vibration motion and the rotary motion.

Here, the weft thread guide 20 is shown in FIGS.
Further, as shown in FIG. 10, a recess 31 is formed on the back side of the surface facing the defective yarn 1a, and two light projectors 32 are provided as photoelectric type yarn sensors 36 for detecting the yarn state at that portion.
And a pressure detector 34 including a strain detecting element, a piezoelectric element, or the like as one light receiver 33 or a pressure type thread sensor 36.

After such yarn processing, as shown in FIG. 4, the length measuring and storing device 3 unwinds only the length required to guide the weft yarn 1 to the removing device 21, for example, three windings on the drum. Next, the guide nozzle 22 guides the weft yarn 1 unwound at the tip position of the main nozzle 4 into the removing device 21 by injecting a guide fluid. Here, the cutter 30 cuts the weft thread 1 immediately before the main nozzle 4, and separates the weft thread 1 inside the main nozzle 4 from the portion used for pulling out the weft thread 1. After this, the removing device 21 pulls the weft yarn 1 toward the yarn feeding side.

The removing device 21 is wound by the weft thread 1 by rotating a pair of nipping rollers in the inside as in the known pulling means, for example, the device of JP-A-61-245339, or the device of JP-A-59-21757. As described above, the weft thread 1 is pulled in by the waist roller, or the weft thread 1 is pulled in by the forward / backward movement of the hook-shaped tow bar, whereby the pulling operation of the weft thread 1 is started.

In this pulling process, as shown in FIG. 5, the weft yarn 1 is pulled from the yarn feeding side, but the weft yarn guide 2
Since the pulling direction is reversed via 0, the defective yarn 1a is always pulled from the arrival side of the weft yarn 1, that is, the non-feeding side. As a result, the defective yarn 1a sandwiched between the upper and lower warp yarns 5 at the position of the weaving cloth 12 is folded back into a hairpin shape at the weaving cloth 12, and at this folding back portion, the weaving cloth 1 is formed.
It is separated from No. 2 and is gradually separated from the yarn supplying side to the opposite yarn supplying side with a smaller traction force than that when directly extracting from the yarn supplying side. Moreover, as shown in FIG. 6, as the separating position moves from the yarn supplying side to the opposite yarn supplying side, the component force of the pulling force on the defective yarn 1a in the separating direction gradually increases.

In the process of pulling out the defective yarn 1a, the driving unit 24
If the pin-like weft yarn guide 20 is given vibration in a proper direction or rotation in the pulling direction as the pulling assisting motion, when the defective yarn 1a is folded back at the weaving cloth 12, it becomes easy to separate from the weaving cloth 12. Therefore, the pulling force for extraction can be further reduced, which is advantageous.

During the pulling operation, the controller 35 detects the presence or absence of a change in the yarn signal from the yarn sensor 36, for example, within a predetermined time from the start of the pulling, so that the removal operation can be performed at the initial stage.
Whether the defective yarn 1a is pulled through the weft yarn guide 20 is detected, and an appropriate removing operation is performed according to the detection result. That is, when the defective yarn 1a is being pulled through the weft yarn guide 20, the controller 35 performs the normal removal operation, but when the defective yarn 1a is not pulled through the weft yarn guide 20, that is, the loop. When the weft thread guide 20 does not exist inside the shaped weft thread 1, the removal operation is carried out in the event of an abnormality.

In the normal removing operation, at least when the weft thread 1a comes into contact with the weft thread guide 20, the removing device 21
The weft thread 1 based on the operation command from the controller 13.
After the weft yarn 1a comes into contact with the weft yarn guide 20 at a low speed, the removing device 21 pulls the weft yarn 1 at a high speed based on a high speed rotation command from the controller 35. The pattern of the pulling speed is as shown in FIG.
The weft yarn 1 is pulled at a low speed or at a medium speed until the weft yarn guide 20 comes into contact with the weft yarn guide 20. When the weft yarn 1 comes into contact with the weft yarn guide 20, that is, at a low speed before and after the abutment, Switch to high speed.

The timing for switching the speed is set on the basis of the previously obtained time from the start of pulling to the contact, or based on the state detection of the weft thread 1. The state of the weft thread 1 is detected by detecting the contact state of the weft thread 1 and the weft thread guide 20 with the thread sensor 36. As a normal removal operation, the weft thread 1 and the weft thread guide 20 may be pulled at a high speed until just before they come into contact with each other, at a low speed when they come into contact with each other, and then at a high speed again after they come into contact with each other. At this time, if the yarn sensor 36 is made of a photoelectric type, it is possible to detect immediately before the contact, in other words, immediately before the yarn tension of the weft yarn 1 rapidly increases, and the pulling speed is rapidly reduced at the time of detection.

In addition, as an appropriate removing operation and a corresponding operation at the time of abnormality, (1) pulling only at low speed (2) weft 1
The weft yarn 1 in the loop-shaped portion is pulled at a high speed, and then the defective yarn 1a is pulled at a low speed, and the speed is switched by a timer that sets the time required to remove the weft yarn in the loop portion (3 ) The pulling operation is stopped, and an alarm is output. For example, the weft thread 1 is pulled.

FIG. 12 shows an example in which the main part of the controller 35 is constituted by a logic circuit. Further, FIG. 13 shows a time chart of the operation of the controller 35. When the winding start signal A is given from the control device 13, the first timer 51 causes the predetermined delay time T1, that is, an appropriate time T1 including the time required for the weft thread 1 to come into contact with the weft thread guide 20. After that, an "H" level output is generated, and the second timer 52 and the third timer 53
The output of "H" level is generated during the operation time T2 for low-speed winding and the operation time T3 (T2> T3) for high-speed winding, respectively. Note that the fourth timer 54 receives the winding end signal B and operates for the operation time T4.
An "H" level output is generated over the entire range. The winding completion signal B is given by the controller 13 at the time when the removal operation is predicted to be completed.

The yarn signal from the yarn sensor 36 is supplied to the amplifier circuit 5
It becomes one input of the comparison circuit 56 via 5. Further, the yarn sensor 5 incorporated in the yarn path inside the removing device 21.
The yarn signal of No. 7 is input to one side of the comparison circuit 59 via the amplification circuit 58. Here, the comparison circuits 56 and 59 compare the reference signals from the reference setters 60 and 61 with the yarn signals from the yarn sensors 36 and 57, respectively, and when there is a yarn, "H".
A level output is generated and an "L" level output is generated when there is no thread.

After the delay time T1 has elapsed since the winding start signal A was input, when the thread sensor 36 detects the thread signal, that is, the weft thread guide 20 is in the normal position in the looped weft thread 1. At this time, the flip-flop 64, which has been reset by the knot circuit 62, judges that high-speed winding is possible, and there is a thread from the comparison circuit 56, that is, an “H” level output and a “H” level output of the first timer 51. It is set by an AND gate 63 that receives and, and drives a relay 66 via a driver 65 to output a high-speed rotation command to the motor driver 50 of the take-up motor 49 of the removing device 21, for example.

During this time, the third timer 53 receives the yarn signal from the yarn sensor 57 as an input and monitors the extraction route. During the operation time T3, when the output of the comparison circuit 59 changes to the absence of yarn, that is, the "L" level, the knot circuit 67 generates the output of the "H" level, so that the AND gates 70, 73 and the OR gate 74. , It judges that the thread is broken from the input condition, drives the driver 75 and the relay 76, and generates a thread break signal. When the signal of the yarn sensor 57 changes to the “L” level, the AND gate 68, which takes a condition between this and the output of the flip-flop 64, judges that the high-speed winding is completed, and determines that the driver 77 and the relay 7 are connected.
8 is driven to generate a high-speed winding completion output. At this time, the next sequence operation is started on the loom side.

When the yarn signal of the yarn sensor 36 cannot be detected after the delay time T1 has elapsed since the winding start signal A was input, it is judged that high-speed winding is impossible and the winding is continued at a low speed. , The thread sensor 5 by the second timer 52
7 is monitored by the AND gate 69, and when the thread signal of the thread sensor 57 changes to the "L" level because there is no thread during the "H" level signal output of the second timer 52, the AND gate 69 , 72 determines that the thread is broken and generates a thread break output. After the winding completion signal B output after the time required for the normal winding operation of the defective yarn is input, the yarn sensor 57 is monitored during the timer time T4, and the yarn signal is detected according to the input condition of the AND gate 71. When the "H" level occurs, it is determined that the winding is defective, and a yarn break signal is generated.

In place of the structure in which the weft thread guide 20 is provided with the thread sensor 36, a pressure detector is installed in the weft thread path between the removing device 21 and the warp thread 5, and when the weft thread 1 comes into contact with the weft thread guide 20. The contact state between the weft thread 1 and the weft thread guide 20 may be detected by detecting an increase in the weft thread tension that occurs in the above step by the pressure detector. Furthermore, the contact state between the weft thread 1 and the weft thread guide 20 may be detected by detecting the torque (current) applied to the winding motor 49.

[0033]

According to the present invention, whether or not the yarn guide is present in the loop of the weft yarn is detected and an appropriate operation is performed based on the detection result, so that the weaving machine can be stably operated without lowering its operating rate. The removal operation can be performed.

[Brief description of drawings]

1 to 6 are plan views for explaining a defective yarn removing operation.

FIG. 7 is an enlarged side view of parts of the weft thread guide and the suction nozzle.

FIG. 8 is an enlarged plan view of a weft thread and a weft thread guide portion.

FIG. 9 is an enlarged side view of the weft thread guide.

FIG. 10 is an enlarged side view of a weft thread guide according to another embodiment.

FIG. 11 is a pattern diagram of traction speed.

FIG. 12 is a block diagram of a controller.

FIG. 13 is a time chart diagram when the controller operates.

[Explanation of symbols]

 1 Weft thread 1a Bad thread 2 Thread feeder 3 Length measuring storage device 4 Main nozzle 5 Warp thread 6 Opening 12 Weaving cloth 14 Suction nozzle 20 Weft thread guide 21 Removing device 35 Controller 36 Thread sensor 49 Winding motor 57 Thread sensor

Claims (1)

[Claims] 1. When a weft insertion failure occurs, the defective thread is kept in a state of being connected to the main nozzle, and after the defective thread is exposed, the weft thread is inserted into the opening in a loop shape, and the weft thread is inserted inside the loop-shaped weft thread. In the process of allowing the weft thread guide to exist and pulling the defective thread from the yarn feeding side through the weft thread guide, it is detected whether or not the defective thread is pulled through the weft thread guide at the initial stage of the removal work, and the detection result is detected. A method for removing defective yarn in a weft insertion, which is characterized in that different removal operations are performed according to the removal operation.