JPH01298248A - Apparatus for controlling removal of defective fiber - Google Patents

Abstract

PURPOSE:To prevent the breakage of a defective weft during the taking-off of the defective weft by rotating the driving source of a rotation body for winding up the defective weft in a power of <= a prescribed torque. CONSTITUTION:The driving source 4 of a winding rotation body 3 for taking off a defective weft 8 from a cloth fell 10 is rotated through a torque control section 5 in a power of <= a prescribed torque. The tension of the defective weft is controlled to a tension value causing no breakage of the defective weft in a process for taking off the defective weft and the generation of the breakage of the defective weft is prevented in the process for taking off the defective weft.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for controlling a drive source of a defective yarn removing device.

BACKGROUND OF THE INVENTION When a weft insertion error occurs in a shuttleless loom, a defective yarn removal device automatically pulls out the wrong weft yarn from the weaving front and sets the loom in a state where it can be restarted. Such an automatic defective yarn removing device requires monitoring in order to determine whether the yarn is being taken out properly or not.

Prior Art The invention disclosed in Japanese Patent Application Laid-Open No. 62-184146 detects the tension of defective yarn and controls the rotational speed of the winding motor according to the magnitude of the tension, thereby preventing accidents such as yarn breakage during unwinding. is prevented.

However, according to the above technology, the winding torque is not considered as the top priority in the control process, so even if the rotational speed of the winding motor is set low, if the winding torque is larger than necessary, When removing the thread,
Thread breakage is inevitable.

On the other hand, JP-A-62-156343 and JP-A-62-17
In the invention of No. 0556, etc., the amount of defective yarn to be pulled out is detected, and the quality of the pulled-out condition is determined based on the magnitude relationship of the amount to be pulled out. These devices are structurally complex because they require length measuring means in the defective yarn extraction path in addition to the defective yarn extraction means.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to prevent yarn breakage during the process of removing defective yarns, and to easily monitor the quality of the defective yarns being removed without the need for length measuring means or the like. That's true.

Solution to the Invention In view of the above-mentioned object, the present invention provides a defective yarn removing device for removing defective yarn that has been wefted incorrectly from a weaving front by the rotational movement of a winding rotating body, in which the drive source of the rotating body is controlled by a predetermined drive source. By rotating at less than the torque, it is possible to prevent the defective yarn from breaking while removing the defective yarn. Furthermore, the present invention enables the winding state of defective yarn to be monitored by an electric device from the rotational speed value and the change in rotational speed over time while the rotating body is being driven to rotate.

Structure of the Invention FIG. 1 shows the basic structure of a control device 1 for removing defective yarn according to the present invention.

This extraction system? The all device 1 includes a drive source 4, a rotating body 3 of the defective yarn removing device 2 as a control target, and
As a control system for this drive source 4, there is a torque control section 5, a rotation control section 6, and a monitoring section 7 as a monitoring system for extraction control.
It is made up of.

The defective yarn removing device 2 is a device that pulls out the defective yarn 8 that has been wefted incorrectly from the front 10 of the woven fabric 9 by the rotational movement of the rotary body 3 for winding.
No. 5339 and Japanese Patent Application Laid-open No. 160455/1983.

The drive source 4 is a torque-controllable motor 4.
1 and a clutch 42, and is connected to the rotating body 3 and also to a rotation detector 1) such as a pulse generator.

Further, the torque control section 5 is a section that drives the drive source 4 with a target torque at the time of receiving a start command from the rotation control section 6, and the rotation control section 6 is a section that drives the drive source 4 with a target torque.
In addition to controlling the start and stop of the torque control section 5, it also controls the operation time of the torque control section 5 using the pulse from the rotation detector 1) as a feedback amount, and controls the operation time of the torque control section 5. Then, the yarn is rotated by the amount of rotation necessary to wind up the defective yarn 8. Furthermore, after receiving the winding command, the monitoring unit 7 determines the winding state of the defective thread 8 from the fluctuation in the rotational speed value of the rotating body 3 and the change in the rotational speed over time, and when the winding is defective, the automatic operation is started. A stop command is sent to the loom control device 12.

Effect of the invention When a weft insertion failure occurs during weaving, the loom control device 1
2 receives a weft stop signal from a weft inserting tweeter (not shown), automatically stops in the next weft inserting cycle, and then reverses, without cutting the weft yarn with a weft inserting error, that is, the defective yarn 8 on the weft inserting side. According to the defective thread 8
is in a state of meddling. Then, the defective yarn 8 is guided to the rotating body 3 by the airflow of the defective yarn removing device 2, the guide hook, etc., and becomes ready to be wound up by the rotation of the rotating body 3.

After such a preliminary operation, the rotation control section 6 receives a winding command from the loom control device 12 and starts the torque control section 5. The torque control unit 5 drives the motor 41 of the drive source 4 by passing a current corresponding to a preset target torque to the motor 41, and rotates the rotating body 3 under a predetermined torque. Of course, this target torque is set within a range where yarn breakage does not occur for the defective yarn 8. As a result, the defective yarn 8 is wound around the outer periphery of the rotating body 3 and pulled out from the selvage 10 without causing yarn breakage or the like with a tension corresponding to the target torque. On the other hand, the amount of winding of the defective yarn 8, that is, the amount of rotation of the rotating body 3 or the drive source 4, is directly detected by the number of pulses of the rotation detector 1), and is input to the rotation control section 6. The rotation control section 6 stores in advance the number of revolutions corresponding to the weaving width, and stops the torque control section 5 when the rotating body 3 or the drive source 4 has rotated by the amount of rotation corresponding to the weaving width. In this way, the defective yarn removing device 2 removes the defective yarn 8 from the front 1.
By extracting from 0, the loom is set to a restartable state. Note that the amount of rotation required to remove the defective yarn 8 can also be set based on the cumulative rotational speed of the motor 41 by indirectly regulating the operating time at that time using a timer.

On the other hand, during this extraction process, the monitoring unit 7 inputs the signal from the rotation detector 1) and detects whether the rotating body 3 is abnormally flat or
Alternatively, it detects a low rotational speed value or a change in rotational speed, determines whether the thread cannot be pulled out due to poor guidance of the defective yarn 8 or entanglement of the defective yarn 8 with the warp yarn, etc., and interrupts the extraction in the event of an abnormality. , issues an automatic operation stop command to the loom control device 12.

According to such extraction control, the tension of the defective yarn 8 does not become higher than the target tension due to torque control.
Since yarn breakage does not occur and the rotational speed of the rotating body 3 is not set lower than necessary, the time required to remove the defective yarn 8 is not prolonged. Furthermore, in the process of removing such defective threads 8, the state of the thread being removed can be electrically determined by the monitoring unit 7, so a conventional length measuring means is not required, and the state of the thread being removed can be accurately determined with a simple configuration. can.

Embodiment 1 (FIGS. 2 and 3) This embodiment shows typical configurations of the torque control section 5, the rotation control section 6, and the monitoring section 7.

The torque control section 5 has a built-in torque setting device 51.

This torque setting device 51 is connected between a constant voltage power supply terminal 52 and ground 53, and connects a summing point 57 and a drive amplifier via contacts 55 and 56 of a relay 54 at the setting end and the ground end. 58 in sequence. Note that the current detector 59 on the output end side of the drive amplifier 58 is connected to the summing point 57 as a feedback signal.

Further, the rotation control unit 6 is assembled with a down counter 62 as a main part in order to directly regulate the amount of rotation of the motor 41. That is, this down counter 62 is connected to a frequency divider 65 connected to a winding command input terminal 63, a weaving width setting device 64, and a rotation detector 1) on the input side, and is further connected to the relay 54 on the output side. It is connected.

Furthermore, the monitoring unit 7 is assembled with an F/V converter 70, a first comparator 71, a second comparator 72, and the like. That is, the F/V converter 70 is connected to the rotation detector 1) on the input side, and is connected to the first AND gate 81 via the first comparator 71 and the second comparator 72 on the output side.
and one end of the third AND gate 83 . Note that the first comparator 71 and the second comparator 72 are connected to an upper speed limit setter 73 and a lower speed limit setter 74, respectively. On the other hand, the input terminal 63 is
After passing through the first timer 76 and the one-shot circuit 77, the first
It is connected to the other end of the AND gate 81, further branches, passes through the second timer 78 and the NOT circuit 79, and is connected to the second AND gate 82 together with the output of the down counter 62.
It is connected to the other input terminal of the third AND gate 83 via. These first AND gate 81 and third AND gate 83 generate an automatic operation stop command signal corresponding to a thread grip failure or warp thread entanglement, and send the signal to the loom side '4B device 12.

FIG. 3 shows the operation of the above embodiment. When a winding command is given to the down counter 62 of the one-rotation control section 6, the numerical value preset in the weaving width setting device 64 is set in the down counter 62. .

As a result, the down counter 62 energizes the relay 54, turns off the normally closed contact 56, and instead sets the normally open contact 55 to the on state. At this time, since the torque setter 51 applies a current corresponding to the target torque to the drive amplifier 58, the drive amplifier 58
The motor 41, which can be torque-controlled with a target torque, is driven after feed hack control. As a result, the defective yarn 8 is pulled out from the front 10 with a tension corresponding to the target torque. On the other hand, the rotation amount of this motor 41 is
It is converted into a pulse number by the rotation detector 1), and is converted into a pulse number by the frequency divider 6.
5 at a predetermined frequency division ratio, and the down counter 62
It becomes a down input. When the motor 41 rotates by the amount of weaving required to remove the defective yarn 8, the count value of the down counter 62 becomes "0", so the counter 62 de-energizes the relay 54 and turns off the contact 55. By returning contact 56, zero voltage is input to drive amplifier 58, and motor 41 is immediately stopped.

According to such a normal sampling process, the F/V output (voltage) of the F/V converter 70 changes as shown by the solid line in FIG. 3. Note that the low level of the solid line in the first half corresponds to the period in which the defective yarn 8, which is held between the warp yarns, is being pulled out from the front 10, and the high level of the solid line in the second half corresponds to the period when the defective yarn 8 is being pulled out from the front 10. This corresponds to the period in which the warp threads are released from the pinch and are wound with light force in an almost no-load state.

By the way, in the preparatory stage for winding, if the defective yarn 8 is not accurately guided to the rotary body 3 and is in a so-called defective yarn grip state, the F/V converter 70
The V output becomes abnormally high at the beginning of winding, as shown by the broken line in FIG. At this time, the motor 41 rotates at a higher speed than during normal operation, and completes the amount of rotation necessary for extraction in a short time. During this time, when the first timer 76 of the monitoring unit 7 receives the winding command signal, it generates a first timer output of "H" level for a preset time, and synchronizes with the fall of the first timer output. Then, the one-shot circuit 77 is driven to generate an "H" level one-shot output. On the other hand, the first comparator 71 compares the signal level corresponding to the upper limit speed with the F/V output, and when the F/V output is greater than the signal level of the upper limit speed, the first comparator 71 outputs "H".
A first comparison output of the level is generated. As a result, the first AND gate 81 takes the AND condition of the "H" level one-shot output of the one-shot circuit 77 and the first comparison output of the first comparator 71, and outputs their "H" level. Over the period of , the first AND output caused by the yarn grip failure is generated, and this is sent to the loom control device 12 as a warning output or an automatic operation stop command signal.

The setting time of the first timer 76 is set to be shorter than the time during which the defective yarn 8 is held between the warp yarns during normal extraction, that is, the time T1 in FIG. 3.

In this embodiment, this set time is set to a relatively short time after the start of winding for the purpose of detecting thread grip failure, but if it is set longer within the above range, It is also possible to detect thread breakage.

Furthermore, a defective state can be similarly detected by omitting the one-shot circuit 77 and inputting the first timer output and the first comparison output directly to the first AND gate.

In addition, if the defective yarn 8 gets entangled with the warp yarns during removal of the defective yarn 8 and cannot be pulled out from the weaving opening with a predetermined torque by the rotating body 3, the motor 41 cannot rotate with the target torque and the third It will eventually stop as shown by the dashed line in the figure. Therefore, the second comparator 72 compares the F/V output with the lower limit speed signal, and when the F/V output becomes smaller than the lower limit speed signal, the second
A comparison output is generated and sent to the negative input terminal of the third AND gate 83. Further, when the second timer 78 receives the winding command, it generates a second timer output at the "H" level with a predetermined pulse width in order to use the transient rotation as a dead zone. The signal is inverted and sent to the second AND gate 82 as a knot output. Therefore, after the second timer output of the second timer 78 falls to the 'L' level, a signal of the '1' level is input from the down counter 62 indicating that the defective thread 8 is being wound. When the second comparison output rises to the "H" level while the loom is running, the third AND gate 83 generates a third AND output due to warp yarn entanglement, and sends this to the loom as a warning output or an automatic operation stop command. It is sent to the control device 12.

In this way, the monitoring unit 7 monitors the fluctuations in the rotational speed of the rotating body 3 or the drive source 4 and the rotational speed during the process of removing the defective yarn 8 by the rotating body 3, that is, the process of torque control and rotation amount control of the motor 41. The winding state, that is, normal winding, and the defective winding state corresponding to thread catching failure, thread breakage, or warp yarn entanglement are determined from changes over time, and in the event of winding failure, an automatic operation stop command is issued to automatically start the loom. to prevent troubles caused by rebooting.

As is already clear, the amount of rotation of the drive 'tA4 can be indirectly regulated by its operating time. When doing so, the down counter 62 is configured as an open control system by a timer and the frequency divider 65 is omitted.

Embodiment 2 (FIG. 4) In this embodiment, the torque controllable drive source 4 is a motor 41.
This is an example in which an electromagnetic clutch 43 capable of torque control is used. That is, this electromagnetic clutch 43
is controlled by the torque control unit 5, and the motor 4
1 and the rotating body 3. In this embodiment, the motor 41 is not subject to torque control and is therefore directly connected to the drive amplifier 50. During operation, the electromagnetic clutch 43 converts the rotation of the motor 41 into a target torque, which is then transmitted to the rotating body 3.

Embodiment 3 (Fig. 5) In Embodiment 1, the winding state is determined by monitoring the rotation speed, but in the embodiment shown in Fig. 5, the amount of rotation of the rotating body 3 is monitored. This is an example of determining the winding state.

Correspondingly, the first comparator 71 and the second comparator 7
2 are connected to an upper limit rotation amount setter 84 and a lower limit rotation amount setter 85, respectively. Since these comparators 71 and 72 change the output signal level based on the comparison of the respective set rotation amounts, the first AND gate 81 and the third AND gate 83
6.88 and one-shot circuit 77.89, an automatic operation stop command is generated at a specified time in the same manner as in the first embodiment, in response to thread grip failure, thread breakage, or warp thread entanglement. The input terminals of these comparators 71 and 72 are connected to the rotation detector 1) via a counter 86 and a frequency divider 87 in order to detect the actual amount of rotation of the rotating body 3.

Effect of the invention The present invention provides the following unique effects.

The rotating body of the defective yarn removal device is rotated by a drive source under the target torque, and during the process of removing defective yarns, the tension of the defective yarns is suppressed to a tension value that does not cause yarn breakage. , the occurrence of thread breakage is eliminated.

In addition, during the process of removing defective yarns, the torque of the rotating body is controlled, and the rotation speed of the drive source is determined in response to fluctuations in the tension of the defective yarns, resulting in a reduction in the time required to remove defective yarns. .

Furthermore, in the process of removing defective yarn, it is possible to determine whether the winding condition is good or bad, especially defects such as poor thread gripping or warp thread entanglement, based on fluctuations in the rotational speed of the rotating body and changes in rotational speed over time. can respond quickly. In addition, since restarting the loom is prohibited in the event of a defective extraction, it is possible to prevent the loom from being restarted even after incomplete extraction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a defective yarn extraction control device of the present invention, FIG. 2 is a circuit diagram of a extraction control device corresponding to the first embodiment, and FIG. 3 is a time chart diagram of the one of the first embodiment.
FIG. 4 is a circuit diagram of the torque control section according to the second embodiment, and FIG. 5 is a block diagram of the monitoring section according to the third embodiment. 1. Defective yarn removal control device, 2. Defective yarn removal device, 3. Rotating body, 4. Drive source, 5. Torque control section, 6. Rotation control section, 7. Monitoring section. 8... Defective thread, 1
0...Orimae, 1)...Rotation detector, 12...1tli
Machine control device, 41...motor, 43...electromagnetic clutch. Patent Applicant Tsudakoma Kogyo Co., Ltd. Agent Patent Attorney Kuni Nakagawa Fig. 1 Fig. 2 Fig. 3 Normal extraction and warp entanglement 3rd AND output (automatic 1st direction 1) 1J1 line) Figure 4 Figure 5

Claims (4)

[Claims] (1) In a defective yarn removal device that removes defective yarns that have been wefted incorrectly from the front by the rotational movement of a winding rotary body, there is a drive source that rotates the rotary body, and a torque that drives this drive source with a target torque. A control device for removing defective yarn, comprising: a control section; and a rotation control section that starts the torque control section in response to a winding command and stops the drive source after winding of the defective yarn is completed. (2) In a defective yarn removing device that removes defective yarns that have been wefted incorrectly from the front by the rotational movement of a winding rotary body, there is a drive source that rotates the rotary body, and a torque that drives this drive source with a target torque. a control unit; a rotation control unit that activates the torque control unit in response to a winding command and stops the drive source after winding of the defective yarn is completed; and a rotation control unit that determines the winding state of the defective yarn from a change in the rotational speed of the rotating body. 1. A control device for removing defective yarn, comprising a monitoring section. (3) The monitoring unit includes a first comparator that compares the rotation speed of the drive source with a preset upper limit speed, and a first comparator that compares the rotation speed of the drive source with a preset lower limit speed. 3. The defective yarn removal control device according to claim 2, further comprising a second comparator that performs the following. (4) The monitoring unit includes a first comparator that compares the rotation amount of the drive source with a preset upper limit rotation amount, and a first comparator that compares the rotation amount of the drive source with a preset lower limit rotation amount. 3. The defective yarn removal control device according to claim 2, further comprising a second comparator for comparing.