JP2916004B2 - Loom operation control method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the operation of a loom for preventing recurrence of a warp break when a loom is restarted after a warp break stop and an apparatus therefor.

[0002]

2. Description of the Related Art In a loom, when a warp break occurs, a cut warp may become entangled with a nearby normal warp and damage the normal warp. Further, the knot generated by repairing the cut warp may be caught by a warp insertion member such as a heald after restarting, and may damage a normal warp. For this reason, when restarting after a warp break stop, warp breaks are likely to recur.

In view of this point, there has been proposed a loom operating method in which the loom is rotated at a low speed after the loom is started until the knot of the warp is woven into the woven fabric (Japanese Patent Laid-Open No. Sho 5).
No. 9-192751). When the warp turns into a fluff, after switching to a normal warp without fluff, the loom is rotated at low speed until the concentrated portion of the knot of the warp is woven into the woven fabric, and after weaving, , To achieve steady high-speed rotation. The rotation speed of the loom at this time is switched by a manual operation by an operator.

[0004]

According to the prior art, in order to switch the number of revolutions of the loom by manual operation, the operator knits the knot of the warp into the woven fabric after rotating the loom at low speed. In the meantime, it is impossible to leave the loom, and when a large number of workers are in charge of the loom, there is an unavoidable problem that the burden on the workers becomes excessive.
Also, if the rotation speed is suddenly changed from low-speed rotation to high-speed rotation, a stop may occur due to poor weft insertion in a jet loom, etc. If there is a restriction, there is a problem that the production efficiency of the loom decreases.

In view of the above-mentioned problems in the prior art, it is an object of the present invention to set the warp tension lower than the steady state for a predetermined period at the time of restart after a warp break and stop, and after a predetermined period elapses. By automatically returning this to the normal state, the burden on the worker will not be excessive,
It is another object of the present invention to provide a loom operation control method and a loom operation control method capable of easily realizing a required high-speed operation without occurrence of a stop due to poor weft insertion.

[0006]

According to a first aspect of the present invention, there is provided a control system for controlling a warp tension for a predetermined period from a restart after a warp break stop. On the other hand, the gist is to set the target tension to a transient target value smaller than the steady target value.

A second aspect of the present invention provides a storage device for storing the occurrence of a warp break stop according to a stop signal from a warp break detector, and a warp for a predetermined period from a restart after the warp break stop. And a switching instruction unit that outputs a switching signal to a sending control unit that controls the tension. The sending control unit includes a steady-state target value (steady state of the loom) corresponding to the switching signal from the switching instruction unit. A target setter that outputs a transient target value (referred to as a target value during operation, the same applies hereinafter) smaller than a transient target value (referred to as a target value in a transitional state from when the loom is restarted to when the loom returns to a steady state, the same applies hereinafter) The point is to provide.

The switching instruction section outputs a similar switching signal to a rotation speed control section for controlling the rotation speed of the driving motor of the loom, and the rotation speed control section at this time also outputs the same target signal. A setting device can be provided.

The switching instruction section can output a switching signal until the knot by warp restoration is woven into the woven fabric.

[0010]

According to the first aspect of the invention, a transient target value smaller than the steady target value is set as the target tension for the control system for a predetermined period from the restart after the warp break stop. The warp tension is controlled to a value smaller than that during the steady operation, and therefore, recurrence of the warp break during this period can be effectively prevented.

According to the second aspect of the invention, when a warp break occurs during weaving and the loom stops, the memory stores the warp break stop according to a stop signal from the warp break detector. Can be stored. Thereafter, when the repair of the warp is completed, the switching instruction unit refers to the storage content of the storage device when restarting the loom, confirms that the restart is performed after the warp break stop, and from the restart. The switching signal is output to the transmission control unit only for a predetermined period.

On the other hand, the transmission control unit includes a target setter that outputs a transient target value smaller than the steady target value in response to the switching signal. During the period, the warp tension can be controlled so as to follow the transient target value, and after a predetermined period has elapsed, this can be automatically returned to the steady target value.

When the switching instruction unit also outputs a switching signal to the rotation speed control unit, the rotation speed control unit similarly performs a predetermined period of time when the loom is restarted after the warp break stop. Since the rotational speed can be controlled according to a transient target value smaller than the steady target value, the quality of the woven fabric is deteriorated due to a decrease in the warp tension by appropriately selecting each of the transient target values of the warp tension and the rotational speed of the loom. Therefore, a decrease in productivity due to a decrease in the number of revolutions can be neglected, and further, prevention of recurrence of warp breakage can be properly realized.

If the warp break stop is not stored in the memory at the time of start-up, the switch instructing unit determines that the restart is not after the warp break stop and does not output the switch signal. Thus, when the loom is stopped for a reason different from the warp breakage and is restarted, the sending control unit and the rotation speed control unit respectively start the warp matching the regular steady target value immediately after the start. The loom can be operated by the tension and the rotation speed.

In the switching instructing section, after the loom is started, the switching signal is output until the knot by the repair of the cut warp is woven into the woven cloth. On the other hand, the predetermined period for setting the transient target value can be minimized.

[0016]

Embodiments will be described below with reference to the drawings.

The operation control device of the loom includes a warp break detector 1
1 is provided with a storage unit 12 for inputting the stop signal S1 from the control unit 1 and a switching instruction unit 13 for outputting a switching signal S2 to the rotation speed control unit 14 and the transmission control unit 15 (FIG. 1).

The loom is any type of loom (FIG. 2), and the warp Wa from the warp beam B1 passes through the tension roller B2, the dropper DP, the heald frame SD, SD and reaches the weaving WF, and the warp shedding is performed. The weft F inserted into Wa1 is replaced with a reed R
The woven fabric W is woven by driving into the woven cloth WF. The woven fabric W passes through the take-up roller B3,
Rewind to 4

The main shaft MS of the loom is connected to a driving motor M via a belt MS1. Also, the warp beam B1
Is driven by the delivery motor M1 and the woven fabric beam B
4 is driven by a winding motor (not shown).

The dropper DP is provided with a warp break detector 11
, And the driving motor M is connected to the rotation speed control unit 14. The delivery motor M1 is connected to a delivery control unit 15, to which the warp tension T of the warp Wa is input from a load cell B2a attached to the tension roller B2.

The warp break detector 11 outputs a stop signal S1 by operating the dropper DP when a warp break occurs (FIG. 1), and the stop signal S1 is input to the storage unit 12. I have. The output of the storage unit 12
It is connected to the. The switch instructing unit 13 receives a loom start signal Ss from a loom control circuit (not shown) and a counter 1 which receives a clock signal Sc as an input.
6 are connected.

The switching instruction unit 13 includes an AND gate 13a,
It comprises a comparator 13b and a setting device 13c (FIG. 3). The output of the storage device 12 and the start signal Ss are provided to the AND gate 13a.
And the output of the comparator 13b are input, and the output is output to the outside as a switching signal S2. A counter 16 and a setter 13c are connected to input terminals A and B of the comparator 13b, respectively.

The switching signal S2 from the switching instruction unit 13 is branched and input to the rotation speed control unit 14 and the transmission control unit 15 (FIG. 1). The rotation speed control unit 14 and the transmission control unit 15 are totally controlled by a main control unit 17, and the rotation control unit 14 and the transmission control unit 1 are transmitted from the main control unit 17.
5, an operation command signal S3 is output. Further, the main controller 17 receives the stop signal S1 from the warp break detector 11 and the start signal Ss, and
Are separately connected to the memory 12 and the counter 16.

The rotation speed control unit 14 and the sending control unit 15
Each of the target setting devices 14a and 15a and the control device main bodies 14b and 15b are cascaded (FIG. 2). The control device body 14b is, for example, an inverter device that drives the driving motor M at a variable speed, and controls the rotation speed of the drive motor M, that is, the rotation speed n of the loom, according to the target rotation speed no from the target setting device 14a. be able to. Further, the control device main body 15b is provided with a target tension To
Is a closed loop control system for controlling the warp tension T with the delivery motor M1 as an operation target. Goal setting unit 14
A switching signal S2 from the switching instruction unit 13 is input to a and 15a, and an operation command signal S3 from the main control unit 17 is input to the control device main bodies 14b and 15b.

During normal operation of the loom, the rotation speed control unit 14
An operation command signal S3 from the main control unit 17 is output to the transmission control unit 15, and therefore, the rotation speed control unit 14,
The delivery control unit 15 determines that the rotation speed n of the loom and the warp tension T are
The control of the driving motor M and the sending motor M1 is continued so that n = no and T = To, respectively.
However, here, the target rotation speed no and the target tension To
It is assumed that the respective steady target values are noa and Toa (FIG. 4).

When a warp break occurs in the warp Wa, the dropper DP operates and the stop signal S from the warp break detector 11 is sent.
1 is sent to the storage unit 12 and the main control unit 17. As a result, the storage unit 12 stores the occurrence of the warp break stop, while the main control unit 17 resets the operation command signal S3 and sets the driving motor so that the main shaft MS of the loom stops at a predetermined crank angle. M: The loom can be stopped by stopping the delivery motor M1.

After that, when the warp Wa is restored and the loom is restarted, a start signal Ss is generated in the loom control circuit, and the start signal Ss is transmitted to the main control unit 17 and the switching instruction unit 1.
3 is input.

When the start signal Ss is input, the main control unit 17 first outputs an operation command signal S3 to the rotation speed control unit 14 and the transmission control unit 15 to operate them and to operate the counter. An activation signal S4 is sent to the counter 16 to clear the counter 16 and activate it at the same time. Since the clock signal Sc is input to the counter 16, the counter 16 counts the clock signal Sc to measure the elapsed time t thereafter, and measures the elapsed time t by using the input terminal of the comparator 13 b of the switching instruction unit 13. A (FIG. 3).

The setting terminal 1 is connected to the input terminal B of the comparator 13b.
3c is connected, so the setting device 13c now has
Assuming that the predetermined set time to is set, the output of the comparator 13b which becomes positive logic when A <B is t <to
And positive logic can be obtained on condition of It is assumed that the output of the storage unit 12 becomes positive logic when the storage unit 12 stores the warp break stop. Therefore, since the inputs of the AND gate 13a, including the start signal Ss, all have a positive logic, the switching instruction unit 13 can output the switching signal S2.

At this time, the rotation speed control unit 14
The target setting device 14a outputs a target rotation speed no = nob to the control device main body 14b on condition that the switching signal S2 is present. Here, the transient target value nob is set to nob <noa with respect to the steady target value noa (FIG. 4). As a result, the loom is started, and is operated at the rotation speed n = nob <noa.

In the sending control section 15, the target set value 15a outputs the target tension To = Tob <Toa to the control device main body 15b on condition that the switching signal S2 is present. 15b, the delivery motor M is controlled so that the warp tension T matches the transient target value Tob.
1 control can be started.

Thereafter, when the weaving progresses and the elapsed time t measured from the restart by the counter 16 exceeds the set time to, the output of the comparator 13b of the switching instruction unit 13 is inverted, and the AND gate 13a is inverted. Is closed, and the switching signal S2 disappears (FIG. 4). Thereby, the target setting devices 14a and 15a of the rotation speed control unit 14 and the transmission control unit 15
Respectively, gradually increases the target rotation speed no and the target tension To from the transient target values nob and Tob to the steady-state target values noa and Toa, respectively. Accordingly, the loom has its rotation speed n and the warp tension T
Can be increased toward the steady-state target values noa and Toa,
After the transition time Δt, n = noa and T = Toa, and it is possible to return to the normal operation. However, here, the transition time Δt is realized by a ramp signal generator (not shown) built in the target setting units 14a and 15a.

That is, here, in the restart after the warp break stop, when the elapsed time t after the start is t <to, the switching signal S2 exists, and the rotation speed control unit 14 and the transmission control unit 15 are provided. Controls the rotational speed n and the warp tension T of the loom according to the transient target values nob and Tob. In other words, the switching instruction unit 13 determines the predetermined period for outputting the switching signal S2 based on the elapsed time t. The contents stored in the storage unit 12 may be cleared by a reset signal S5 from the main control unit 17. However, the reset signal S5 is preferably generated, for example, based on the fact that the loom has started and has returned to the normal operation.

In general, during the predetermined period, that is, the set time to set in the setting unit 13c, the warp Wa breaks and the knot generated when the warp is repaired is woven into the woven fabric W by the progress of weaving. It is sufficient to take the length of time until it is completed. Therefore, the predetermined period may greatly vary depending on the position where the warp Wa has occurred in the warp Wa. Therefore, the position where the warp break has occurred is detected by an appropriate method, and based on the result, a different set time to is set. You may make it set to the setting device 13c. The setting operation of the set time to may be performed manually, but if automatic detection means for detecting the warp break position is used (for example, Japanese Patent Application Laid-Open No. 1-148843,
(See Japanese Patent Application No. 2-104282), and it is extremely easy to automate this. It is also possible to empirically determine a position where warp breakage is most likely to occur, and set the set time to determined corresponding to this position as a representative predetermined period.

[0035]

[Other Embodiments] In the target setting units 14a and 15a, the transition time Δt for transitioning the target rotation speed no and the target tension To from the transient target values nob and Tob to the steady target values noa and Toa is as follows:
In general, it is preferable that both the rotation speed control unit 14 and the transmission control unit 15 match each other, but they may be different from each other. Further, Δt = 0 may be set for one or both of them. Normally, when the rotation speed n of the loom is suddenly changed, the weft insertion control system does not follow,
Although weft insertion failure may occur, the warp tension T is not so limited. Therefore, the transition time Δ
It is practical that t is determined in accordance with the shortest time that can be realized on the rotation speed control unit 14 side.

When restarting after a warp break stop, the transient target values nob and Tob smaller than the steady target values noa and Toa are applied not by both the rotation speed control unit 14 and the delivery control unit 15. Or any one of them. One of the rotation speed n of the loom and the warp tension T is set to a steady target value n during steady operation.
This is because the recurrence prevention of warp breakage can sometimes be achieved only by making it smaller than oa and Toa. However, in general, the effect of decreasing the warp tension T is more remarkable, so that it is preferable to select the delivery control unit 15 rather than the rotation speed control unit 14.

In the above description, the predetermined period during which the switching instruction section 13 outputs the switching signal S2 is determined based on the elapsed time t until the knot due to the repair of the warp Wa is woven into the woven fabric W. Alternatively, the determination may be made based on the weaving length of the woven fabric W to be woven after the loom is started or based on the number of weaving picks during weaving. Instead of the clock signal Sc, a weaving length measurement signal of the woven fabric W or a pick signal may be input to the counter 16.

If a switch dedicated to restarting after a warp break and stop is provided as a start switch of the loom, and the switch instructing section 13 is operated only when this switch is operated, the storage device 12 can store the loom. This can be omitted.

[0039]

As described above, according to the first aspect of the present invention, the warp tension can be controlled according to the transient target value smaller than the steady target value for a predetermined period after the warp break stop. Therefore, there is an excellent effect that recurrence of warp breakage immediately after restart can be effectively prevented.

According to the second aspect of the present invention, the storage unit for storing the occurrence of the warp break stop and the switching instruction unit for transmitting the switching signal to the control unit only for a predetermined period after the restart are combined. When restarting after a warp break stop, the sending control unit controls the warp tension so as to follow a transient target value smaller than the steady target value by a switching signal, and then automatically returns to the steady target value. Therefore, there is no danger that the burden on the worker will be excessive, and there is an excellent effect that the required high-speed operation can be easily realized without occurrence of a stop due to poor weft insertion. .

Further, if the rotational speed controller is simultaneously controlled and a transient target value is set for the rotational speed of the loom, it is not necessary to make the transient target value for the warp tension too small. There is no risk of lowering the quality of the woven fabric due to the lowering of the warp tension, and it is not necessary to reduce the number of revolutions at this time to a remarkable decrease in productivity. Therefore, it is possible to prevent both the quality reduction and the productivity reduction to a negligible level while appropriately preventing the recurrence of the warp breakage.

[Brief description of the drawings]

Fig. 1 Overall block system diagram

FIG. 2 is a system diagram of a main part configuration

FIG. 3 is a detailed block diagram of a main part.

FIG. 4 is an operation explanatory diagram.

[Explanation of symbols]

 M: driving motor W: woven fabric Wa: warp T: warp tension n: rotation speed t: elapsed time S1: stop signal S2: switching signal To: target tension Toa, noa: steady target value Tob, nob: transient target value DESCRIPTION OF SYMBOLS 11 ... Warp breakage detector 12 ... Storage device 13 ... Switching instruction part 14 ... Rotation speed control part 15 ... Sending out control part 14a, 15a ... Target setting device

Claims (4)

(57) [Claims] 1. A loom for setting a target tension to a transient target value smaller than a steady-state target value for a control system for controlling a warp tension for a predetermined period from a restart after a warp break stop. Operation control method. 2. A stop signal from a warp break detector detects
A storage unit that stores the occurrence of the warp break stop; and a switching instruction unit that outputs a switch signal to a sending control unit that controls the warp tension for a predetermined period from a restart after the warp break stop. An operation control device for a loom, wherein the sending control unit includes a target setting unit that outputs a transient target value smaller than a steady target value in response to a switching signal from the switching instruction unit. . 3. The switching instruction unit outputs a switching signal to a rotation speed control unit that controls the rotation speed of a driving motor of a loom for a predetermined period from a restart after a warp break stop. The operation control device for a loom according to claim 2, wherein the rotation speed control unit includes a target setter that outputs a transient target value smaller than a steady target value in response to a switching signal from the switching instruction unit. . 4. The operation control device for a loom according to claim 2, wherein the switching instruction unit outputs a switching signal until the knot by warp repair is woven into the woven fabric.