JPH1181090A - Weft-treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weft-treating device capable of rapidly detecting yarn- hooking, yarn-clogging and yarn-breaking while discharging defective part of a weft. SOLUTION: This weft-treating device has a length-measuring and storing device 14 having a yarn-guide 20 for winding a weft 10 from yarn-supplying bodies 12a and 12b on a drum 22, and an engaging pin 26 installed in the drum 22 so as to be advanced and retreated, a pneumatic suction means 36 for drawing out the weft 10 from the drum 22, an unwinding sensor 46 for detecting unwound weft from the drum 22, a controlling means 32 for discharging the weft 10 from the yarn-supplying bodies 12a and 12b by operating the pneumatic suction means 36 while winding the weft 10 on the drum 22 in the state in which the engaging pin is retreated, and an observing means 70 for inputting a detected signal from the unwinding sensor 46 when discharging the weft, and outputting an abnormal signal when generating interval of the detected signals exceeds a set value. As the result, the increase of the generating interval of the detected signals, or cutting off of the detected signal, accompanied with generation of yarn-hooking, yarn-clogging and yarn-breaking is rapidly detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft processing apparatus for removing a defective portion of a weft supplied from a yarn feeder to a loom.

[0002]

2. Description of the Related Art Prior to weft insertion, a weft supplied from a yarn supplying body to a loom includes a drum around which the weft is wound and a yarn guide rotatably arranged around the axis of the drum to wind the weft around the drum. It is stored in the length measuring storage device provided with. The weft yarn stored by being wound around the drum of the length measuring storage device is thereafter drawn out and inserted by a weft insertion nozzle.

[0003] Soiled or broken weft yarns, for example, the outer layer portion of a newly used yarn feeder, the inner layer portion of a used yarn feeder (portion close to a bobbin), or the used yarn feeder and a spare yarn Is discharged through the weft processing device as a defective portion without being inserted into the weft.

Conventionally, a weft processing apparatus has a weft insertion nozzle,
A suction nozzle for sucking the weft injected from the weft insertion nozzle (Japanese Patent Laid-Open No. 2-277854).
issue). According to this weft processing device, the weft insertion nozzle and the suction nozzle are operated to discharge the inner layer portion, the seam, and the outer layer portion of the spare yarn feeder in use, and the locking pin is interposed therebetween. The fork was wound back around the drum by continuously rotating the yarn guide in a state in which the weft was forcibly retracted from the drum, while the wound weft was drawn out of the drum by the weft insertion nozzle.

Further, at the time of discharging, the time from the start of discharging to the activation of the seam sensor is monitored. If the time is longer than the set value of the timer, it is determined that a yarn jam, a yarn jam or a yarn breakage occurs during the discharging. Judgment is made and an alarm is output.

[0006]

According to the conventional technique, the set value needs to be longer than the time required for discharging the inner layer portion and the seam.
Even if an abnormality such as a thread jam, a thread jam, or a thread break occurs, the timing for outputting the alarm is delayed.
After the alarm is output, the loom is restarted after being repaired by the operator, so that there is a problem that the restart of the loom is delayed accordingly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weft processing apparatus for quickly detecting a thread jam or a yarn jam during discharge of a defective portion of a weft.

[0008]

SUMMARY OF THE INVENTION A weft processing device according to the present invention comprises a yarn guide for winding a weft from a yarn supplying body around a drum, and a length measuring and storing device having a locking pin provided to advance and retreat to the drum. A pneumatic traction means for drawing the weft from the drum, an unwinding sensor for detecting the weft unwound from the drum, and the pneumatic traction means while winding the weft around the drum with the locking pin retracted. And a control means for discharging the weft of the yarn feeder by operating the detection signal from the unwinding sensor during the discharge of the weft, and outputting an abnormal signal when a detection signal generation interval exceeds a set value. Monitoring means.

According to the configuration of the present invention, the set value can be set to a time slightly shorter than the interval of generation of the detection signal from the unwinding sensor during normal discharge. Therefore,
Even if the weft is caught on the way during discharging or if the weft becomes a dumpling and cannot pass through the weft insertion nozzle or weft pulling means and is not unwound from the drum, this is quickly detected and an abnormal signal is output. Can be output. Therefore, the subsequent restoration is performed promptly, and the time until the loom is restarted can be sufficiently reduced.

[0010] The monitoring means can output an abnormal signal when the time from the input of the detection signal to the input of the next detection signal exceeds a set value.

Each time one detection signal is input, the time until the next detection signal is input is monitored in sequence, so that an abnormal signal can be output immediately when an abnormality occurs in the weft discharge.

[0012] The monitoring means may be configured to detect an abnormality when the time from the time of input of the first detection signal to the time of input of the last detection signal of the predetermined number of continuously input detection signals exceeds a set value. A signal can be output. Each time a predetermined number of detection signals are input, the monitoring means monitors whether the time from the input of the first detection signal to the input of the last detection signal exceeds a set value.

As described above, when a predetermined number of detection signals are targeted, the interval between two adjacent detection signals fluctuates during normal discharge, and the interval between any two detection signals temporarily varies. Even if it becomes larger, it is possible to prevent erroneous determination of abnormal discharge.

Further, the monitoring means can output an abnormal signal when the number of detection signals input within a predetermined time falls below a threshold.

When an abnormal discharge occurs, the interval between two adjacent detection signals increases, so that the number of detection signals input within a predetermined time decreases and falls below a threshold. This makes it possible to detect abnormal discharge.

At this time, assuming that the predetermined time is T1 and the threshold is N, it is assumed that P (P <N) detection signals are actually input within the predetermined time T1, and the monitoring means is determined by P
The operation of outputting an abnormal signal when the average value T / (P-1) of the generation intervals of each two adjacent detection signals among the detection signals exceeds T / (N-1). Is going.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The weft processing device converts the weft 10 into a yarn feeder 12.
a, a length measuring and storing device 14 for temporarily storing the yarns from the nozzles a, 12b, an ejector nozzle 36 as a pneumatic traction means, and yarn amount sensors 8a, 8b provided corresponding to the yarn feeders 12a, 12b. , The seam sensor 9, the unwinding sensor 46, the control means 32 and the monitoring means 70 (FIG. 1).

The length measuring / storing device 14 is composed of a drum 22, a yarn guide 20 driven by a motor 23 and a locking pin 26 in combination. During weaving, the weft 10 passed through the yarn guide 20 is wound around the outer periphery of the drum 22 over a predetermined number of turns. Further, at the start of the weft insertion, the weft yarn 10 is released from the locked state on the drum 22 by the retreat of the locking pin 26, and is inserted through the weft insertion nozzle 16. The weft yarn 10 is unwound from the drum 22 while drawing a balloon. At this time, the weft 1
0 is measured, and when the specified length is unwound, the locking pin 2
6 is returned to the original locking position.

The ejector nozzle 36 is provided on the opposite side of the yarn supply side, at a position where the leading end of the normally inserted weft 10 does not reach slightly. Ejector nozzle 36
Open toward the opening of the warp. At the rear of the ejector nozzle 36, the collection box 3 is connected via a weft guide tube 37.
9 are connected (FIG. 1). A pressure air source 73 is connected to the ejector nozzle 36 via a pressure control valve 74 and an electromagnetic switching valve 76 (FIG. 2). During weaving, the electromagnetic on-off valve 76 is closed and the ejector nozzle 36 is closed.
Is inactive.

The yarn amount sensors 8a and 8b are provided near the tail-end yarn supply bodies 12a and 12b, respectively.
It is possible to detect that the weft 10 of the yarn supplying bodies 12a and 12b is low. The detection signals of the yarn amount sensors 8a and 8b are output to a loom control device (not shown). Also,
The seam sensor 9 is provided between the yarn feeders 12a and 12b, and detects that the seam of the tail-end weft 10 has been pulled out.

The control means 32 includes a control unit 90, a counter 9
2 and a setting device 94. The counter 92 has
The seam sensor 9, the unwinding sensor 46, and the setting device 94 are connected. The control unit 90 is connected to a counter 92 and receives a discharge preparation command and a discharge command from the loom control device. Further, the control unit 90 outputs an operation control signal and a discharge end signal. The operation control signal is output to the solenoid 27 of the locking pin 26, the electromagnetic switching valve 76, and the motor 23, and the discharge end signal is output to the loom control device (FIG. 4).

The monitoring means 70 comprises an AND circuit 80, a retriggerable vibrator 82, a time constant setting device 84, a knot circuit 86, and an AND circuit 88. The retriggerable vibrator 82 receives a discharge command from the loom control device and an unwinding pulse signal from the unwinding sensor 46 via an AND circuit 80, and outputs a high level signal over the monitoring time T set by the time constant setting device 84. The signal is output to the knot circuit 86. The AND circuit 88 receives the output signal of the knot circuit 86 and a discharge command, and outputs an abnormal signal when both are at a high level (FIG. 3).

When the yarn feeder 12a is consumed and the remaining yarn amount becomes small, the yarn amount sensor 8a operates and a detection signal is output to the loom control device. Since the detection signal is used as a loom stop signal, the loom control device determines the predetermined spindle rotation angle (350
°) brake the loom spindle. At the same time, a discharge preparation command is output to the control unit 90. The loom stops around a predetermined spindle rotation angle (300 °) in the next cycle. When the control unit 90 receives the ejection preparation command, the control unit 90
By outputting an operation control signal to the solenoid 27, the weft yarn longer than one pick, for example, the weft yarn 10 for one extra turn is unwound from the drum 22 when the weft is inserted during the inertia operation of the loom. Further, when the discharge preparation command is input, the control unit 90 opens the electromagnetic on-off valve 76 to generate a suction force on the ejector nozzle 36.

When the weft is inserted during the weaving operation during the inertia operation of the loom, the weft is unwound by one turn, so that the leading end of the weft 10 sent by the weft insertion nozzle 16 and the auxiliary nozzle (not shown) reaches the ejector nozzle 36. Is sucked. The loom control device disables the yarn feeding cutter so that the weft inserted during the inertial operation is not cut.

When the loom stops, the loom control device reverses the main shaft of the loom by about 120 ° to open the warp, and then outputs a discharge command to the control section 90 and the monitoring means 70. When the control unit 90 receives the discharge command, the control unit 90 stops the continuous injection of the weft insertion nozzle 16 and sets the locking pin 26
Is forced to retreat. Further, the motor 23 is operated to rotate the yarn guide 20 continuously. Since the weft remains wound around the drum 22, if the yarn guide 20 is rotated with the locking pin 26 retracted, the weft is immediately wound around the drum 22. On the other hand, weft 1
0 indicates that the suction force of the ejector nozzle 36
And is discharged to the collection box 39. The weft is held on the drum 22 during discharging.

When all of the weft yarns 10 of the yarn supplying body 12a are pulled out by the above-described discharging operation, the yarn supplying body 1a passes through the joint.
The 2b weft yarn 10 is automatically pulled out. The seam withdrawal is detected by the seam sensor 9 and the detection signal is
It is output to the set input terminal of the counter 92 of the control means 32. In response to this, the counter 92 resets the count value, inputs the unwinding pulse signal that is the weft detection signal from the unwinding sensor 46, and starts counting the number of pulses. The counter 92 outputs a count-up signal to the control unit 90 when the count number matches the value set in the setting unit 94. The control unit 90 continues the discharging operation until the count-up signal is input from the counter 92, so that the weft 10 in the outer layer portion of the yarn supplying body 12b can be discharged by a predetermined amount during this period.

When the count-up signal is input, the control unit 90 outputs a discharge end signal to the loom control device, stops the motor 23, and stops the winding of the weft by the yarn guide 20. Thereafter, after a lapse of time sufficient for all the wefts 10 on the drum 22 to be unwound,
The control unit 90 advances the locking pin 26, closes the electromagnetic control valve 76, and further moves the weft insertion nozzle 16
Is restored. At this time, since the weft yarn 10 is directly connected to the weft insertion nozzle 16 from the yarn guide 20, a predetermined amount of preliminary winding can be performed by rotating the motor 23 by a predetermined amount.
The loom control device stops the discharge command when the discharge end signal is input.

On the other hand, the monitoring means 70 monitors the generation interval of the unwinding pulse signal from the unwinding sensor 46 while the discharge command is being input. That is, the AND circuit 80 outputs the unwinding pulse signal to the retriggerable vibrator 82 while the discharge command is being input. The retriggerable vibrator 82 outputs a high-level signal to the knot circuit 86 for the monitoring time T every time the unwind pulse signal is input. The high level signal is inverted by the knot circuit 86 to become a low level signal. During the discharge of the weft 10, if the weft 10 is pulled out without being caught by the warp, the auxiliary nozzle or other members, the unwinding pulse signal is sequentially input at intervals shorter than the monitoring time T as the set value. In other words, the time from the input time of each unwinding pulse signal to the input time of the next unwinding pulse signal is equal to or less than the monitoring time T. Therefore, a high-level signal is constantly output from the retriggerable vibrator 82, and the signal of the knot circuit 86 is maintained at a low level. Then, the discharge command is stopped when the discharge is normally completed, so that no abnormal signal is output from the AND circuit 88 even if no unwind pulse signal is input thereafter.

When the discharge operation is completed, the loom control device stops the discharge command and restarts the loom as described above.
At this time, the weft 10 is connected from the weft insertion nozzle 16 to the ejector nozzle 36, but when the loom is started, the weft 10 is separated from the weft insertion nozzle 16 by a yarn feed cutter (not shown) at the next cutting timing. Further, shortly after the start-up, it is separated from the ejector nozzle 36 by an unillustrated ear cutter on the non-yarn feeding side.

If the yarn is caught or clogged during the discharge of the weft, the drawing is interrupted and the next unwinding pulse signal is not output within the monitoring time T. In other words, the time from the input point of the unwinding pulse signal to the input point of the next unwinding pulse signal exceeds the monitoring time T. Therefore,
The signal from the triggerable vibrator 82 becomes low level, and the knot circuit 86 outputs a high level signal. The AND circuit 88 includes the knot circuit 8 together with the discharge command.
When a high level signal is input from No. 6, an abnormal signal is output to the loom control device and the control unit 90. Therefore, an abnormal signal will be output within the time T at the latest after the occurrence of thread catching, thread jamming, or thread breakage.

When the loom control device inputs the abnormal signal, it displays an alarm indicating that the discharging operation has failed. On the other hand, the control unit 9
In the case of 0, the locking pin 26 is moved forward, and the ejector nozzle 36 and the motor 23 are stopped to stand by.

The monitoring time T set by the time constant setting device 84 may be set to a value larger than the interval T0 of unwinding pulse signals during normal extraction, and the generation time T0 = 20.
In the case of milliseconds, for example, T is set to 60 milliseconds.

Immediately after the start of weft discharge, the drum 22
The unwinding of the weft from the yarn is not stable, and the interval of generation of the unwinding pulse signal is large. Therefore, instead of performing the monitoring operation for the unwinding pulse signal immediately after the input of the discharge command as in the above-described embodiment, a predetermined time after the input of the discharge command, or
It is desirable that after a predetermined number of unwinding pulse signals have been input from the input of the discharge command, a monitoring operation is performed on unwinding pulse signals that follow.

Alternatively, the monitoring operation may be performed for a monitoring time T 'that is longer than the monitoring time T for a predetermined time after the input of the discharging command or for a predetermined number of unwind pulse signals after the input of the discharging command.

Further, in the monitoring means shown in FIG. 3, a discharge command is inputted to one input terminal of the AND circuit 88. Therefore, if the first unwinding pulse signal is not input at the same time as the ejection command, an abnormal signal may be output even if the normal ejection is performed. Therefore, instead of the discharge command, a signal generated after a sufficient time to output a normal first unwinding pulse signal after the output of the discharge command may be input to the AND circuit 88.

When the present invention is applied to a loom having a multicolor weft insertion device, the monitoring time T can be changed according to the type of yarn to be discharged. That is, in the case of the two-color weft insertion device, a plurality of unwinding sensors 46a and 46b are connected to the AND circuit 80 via the OR circuit 85, and the time constant setting device 8
7, a plurality of monitoring times T are set. The time constant setting unit 87 outputs a monitoring time T corresponding to the type of yarn to be discharged, based on the weft selection signal output from the loom control device.
(FIG. 6).

In the multicolor weft insertion device, the weft insertion nozzles 16a and 16b are close to each other. For example, the weft insertion nozzle 16b continuously jets even while the weft 10a is being discharged (FIG. 5). For this reason, even if yarn catching or yarn clogging occurs in the weft 10a being discharged, the location of the weft 10a
If it is downstream of 6a, the weft 10a will be pulled out of the drum 22 by the continuous injection from the weft insertion nozzle 16b. At this time, the unwinding sensor 46a continues to output the unwinding pulse signal, although the pulse signal generation interval (T1a) is longer than the normal discharge interval (T0a). However, by switching the monitoring time T as described above, it is possible to set the optimum time T (T0a <T <T1a) according to the yarn type. Therefore, it is possible to reliably detect the occurrence of thread catching and yarn jamming. Can be.

In the above-described modification, the monitoring time T is switched. For example, the interval of generation of the unwinding pulse signal at the time of pulling out the weft by continuous injection is T1a for the weft 10a and T1b for the weft 10b. Further, the interval of generation of the unwinding pulse signal at the time of normal discharge is set to the weft 10a.
T0a for the weft 10b and T0b for the weft 10b
If 1a and T1b <T0a and T0b, then
If the monitoring time T is set to T1a and T1b <T <T0a and T0b, it is possible to detect the occurrence of thread catching and thread clogging even with a single monitoring time T.

[0040]

In another embodiment of the present invention, instead of sequentially monitoring the time from the input time of the unwinding pulse signal to the input time of the next unwinding pulse signal for each unwinding pulse signal, For the N unwinding pulse signals, the time from the input point of the first unwinding pulse signal to the input point of the last unwinding pulse signal among the N unwinding pulse signals is sequentially monitored. (FIG. 7).

The monitoring means 70 shown in FIG.
0, counter 100, setting device 102, OR circuit 104,
Retriggerable vibrator 106, flip-flop 1
08, a measuring device 110, a comparator 112, and a setting device 114
And a combination of

The AND circuit 80 inputs a discharge command and an unwinding pulse signal from the unwinding sensor, similarly to the one shown in FIG. Further, the output terminal of the AND circuit 80 is connected to the count signal input terminal of the counter 100 and is branch connected to the set input terminal of the flip-flop 108. A setter 102 is provided at a set value input terminal of the counter 100.
And the output terminal of the retriggerable vibrator 106 is connected to the reset signal input terminal.

The ritable vibrator 106 inputs the output signal of the counter 100 and the discharge end signal from the control means 32 via the OR circuit 104. The retriggerable vibrator 106 outputs a one-shot signal to the reset input terminal of the flip-flop 108 when the above signal is input. An output terminal of the flip-flop 108 is connected to an input terminal of the measuring device 110. Also, the comparator 112
Are connected to the measuring device 110 and the setting device 114.
Are connected respectively.

When the currently used yarn feeder is consumed and the remaining yarn amount becomes small, the yarn amount sensor outputs a detection signal. The loom is stopped in response to this, and the weft is finally discharged based on the discharge command from the loom control device, as in the embodiment shown in FIGS.

When the ejector nozzle 36 operates in response to the discharge command, the weft is unwound from the drum 22 while drawing a balloon. At this time, the unwinding pulse signal from the unwinding sensor 46 is output to the counter 100 and output to the set input terminal of the flip-flop 108. Thus, the counter 100 starts counting the unwinding pulse signal. Further, the flip-flop 108 outputs an operation command to the measuring device 110, so that the measuring device 110 starts measuring time.

A set value N is set in the counter 100 via a setting unit 102. The set value N is a value equal to or greater than 3 and smaller than the total number of unwinding pulse signals output during normal ejection, for example, 4 to 20.
It is desirable to set within the range of (or several tens).

When the counter 100 counts N unwinding pulse signals, the high-level signal is output to the OR circuit 104.
Is output to the rewritable vibrator 106 via. As a result, the ritable vibrator 106 outputs a one-shot signal to the reset input terminal of the flip-flop 108 and the reset input terminal of the counter 100, respectively. The flip-flop 108 receives the one-shot signal, stops the operation command to the measuring device 110, and stops the measuring operation of the measuring device 110. Further, the counter 100 resets the count value and prepares for the count of the unwinding pulse signal that is continuously generated.

When the operation command stops, the measuring instrument 110
Stop the time measurement, output the measurement result to the comparator 112,
Reset the measurement result after output. Then AND circuit 80
Output the (N + 1) th unwinding pulse signal, the flip-flop 108 is set, and the measuring instrument 110 starts measuring again. Further, the counter 100 starts counting the unwinding pulse signal.

The measurement result output to the comparator 112 is N
This corresponds to the time from when the first unwinding pulse signal is input to the counter 100 to when the last unwinding pulse signal is input to the counter 100.

Each time the measurement result is input, the comparator 112 determines whether or not the measurement result exceeds the set value T2. If the measurement result does not exceed the set value T2, it prepares for the input of the next measurement result, and if it does, outputs an abnormal signal to the loom control device and the control unit 90 immediately.

The monitoring means 70 repeats the above operation during the discharge of the weft as long as the measurement result does not exceed the set value T2. When the discharge is normally performed and the discharge end signal is output to the OR circuit 104, the retuggable vibrator 1
06 outputs a one-shot signal. Then, the counter 100 and the measuring device 11 are
0 is reset, and the monitoring operation ends.

Further, the monitoring means may sequentially monitor the number of unwinding pulse signals inputted every predetermined time T1 (FIGS. 8 and 9).

The monitoring means 70 shown in FIG.
0, a counter 200, a storage device 202, a comparator 204, a setting device 206, and a clock signal generator 208.

The AND circuit 80 inputs a discharge command and an unwinding pulse signal from the unwinding sensor, similarly to the one shown in FIG. The output terminal of the AND circuit 80 is a counter 200
Is connected to the count signal input terminal of Counter 20
The count output signal of 0 is output to the comparator 2 via the memory 202.
04 is input. A setting unit 206 is connected to the comparator 204 in addition to the storage unit 202.

An ejection command is input to the clock signal generator 208. Further, the output terminal of the clock signal generator 208 is connected to the reset signal input terminal of the counter 200 and the storage device 2.
02 and the comparator 204.

During operation, the clock signal generator 208 sequentially outputs pulse signals as clock signals at regular time intervals T1.

Now, when a discharge command is output from the loom control device, a discharge operation and a monitoring operation are started. The clock signal generator 208 operates according to the discharge command, and outputs the first clock signal (FIG. 9). The counter 200 is reset by the first clock signal.

The unwinding pulse signal is immediately input to the counter 200, and the counter 200 counts the unwinding pulse signal. The count value is sequentially output from the counter 200 to the storage device 202.

When the time T1 has elapsed since the output of the first clock signal, the clock signal generator 208
The second clock signal is output to the counter 200, the storage unit 202, and the comparator 204, respectively.

Thus, the count value of the counter 200 is reset. Further, the storage unit 202 stores the count value at the time when the second clock signal is input, and outputs the stored count value to the comparator 204.

The comparator 204 compares the count value from the storage device 202 with the set value N from the setter 206 (for example, N = 4).
Compare with Each time the clock signal is input, the comparator 204 determines whether the count value from the storage device 202 is lower than the set value N. If the count value is not less than the set value N, it prepares for the next input, and if it is below, immediately outputs an abnormality signal to the loom control device and the control unit 90.

When a new unwind pulse signal is input to the counter 200, the counter 200 starts counting again.

The monitoring means 70 keeps the storage 20
As long as the count value from 2 does not fall below the set value N, the above operation is repeated. When the discharge is normally performed and the discharge command disappears, the operation of the clock signal generator 208 stops, and the monitoring operation ends.

The ejector nozzle 36 can be provided so as to be directed forward of the weft insertion nozzle 16 on the yarn supply side instead of being provided on the non-yarn supply side. At this time, a blowing nozzle may be provided so as to face the ejector nozzle 36 with the axis of the weft insertion nozzle interposed therebetween. When the loom control device receives the detection signal from the yarn amount sensor 8a, the loom is stopped without disabling the yarn feeding cutter. At the time of discharging, the control unit 90 guides the weft from the weft insertion nozzle 16 to the ejector nozzle 36 by the blowing nozzle in a state where the locking pin 26 is forcibly retracted, and thereafter, by the ejector nozzle 36 as in the above-described embodiment. The weft can be discharged. During discharge, the weft insertion nozzle 16 may be set to the non-operation state, or the weft insertion nozzle 16 may be operated to blow the weft yarn to the ejector nozzle 36. In the latter, the weft insertion nozzle 16 and the ejector nozzle 3
6 will constitute the pneumatic traction means.

The present invention can be applied not only to the device for discharging the inner layer portion, the seam and the outer layer portion but also to a known device for discharging the seam and the outer layer portion. Further, the present invention can also be applied to a device for discharging the outer layer portion of a single yarn feeder that is not pick-tailed. Furthermore, the present invention may be applied to a weft processing device for removing a poorly inserted weft yarn, which involves unwinding a weft from a drum in removing a poorly inserted weft yarn from a warp opening. The monitoring means in the present invention may be realized by a computer.

[0066]

According to the present invention, the yarn clogging, yarn clogging, or yarn breakage occurring during the discharge of the weft yarn is immediately detected, and the subsequent repair is immediately performed. The time required to perform can be reduced sufficiently.

[Brief description of the drawings]

FIG. 1 is a schematic view of a weft processing apparatus according to the present invention.

FIG. 2 is a schematic diagram showing pneumatic traction means.

FIG. 3 is a detailed view of a monitoring unit.

FIG. 4 is a detailed diagram of a control unit.

FIG. 5 is a schematic view showing a weft insertion nozzle of the multicolor weft insertion device.

FIG. 6 is a schematic diagram showing a monitoring unit of another embodiment.

FIG. 7 is a schematic diagram showing a monitoring unit of another embodiment.

FIG. 8 is a schematic diagram showing a monitoring unit of another embodiment.

FIG. 9 is an operation diagram showing a monitoring operation by the monitoring means of FIG. 8;

[Explanation of symbols]

 Reference Signs List 22 drum 32 control means 36 ejector nozzle 46 unwinding sensor 70 monitoring means 84, 87 time constant setting device 90 control unit

Claims (4)

[Claims] 1. A length measuring and storage device having a yarn guide for winding a weft from a yarn supplying body around a drum and a locking pin provided to be able to advance and retreat from the drum, a pneumatic traction means for drawing the weft from the drum, and a drum. An unwinding sensor for detecting a weft to be unwound, and control means for operating the pneumatic traction means to discharge the weft of the yarn supplying body while winding the weft around the drum with the locking pin retracted, A weft processing apparatus, comprising: a monitoring unit that inputs a detection signal from a unwinding sensor during discharge of a weft yarn and outputs an abnormal signal when an interval between the detection signals exceeds a set value. 2. The monitoring device according to claim 1, wherein the monitoring unit outputs an abnormal signal when a time from the input of the detection signal to the input of the next detection signal exceeds a set value.
The weft processing device according to 1. 3. The method according to claim 1, wherein the monitoring unit detects an abnormality when a time from a time when the first detection signal is input to a time when the last detection signal is input exceeds a set value. The weft processing device according to claim 1, wherein the device outputs a signal. 4. The weft processing apparatus according to claim 1, wherein said monitoring means outputs an abnormal signal when the number of detection signals input within a predetermined time falls below a threshold.