JP2770061B2 - Control device for defective yarn removing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective yarn removing device for a shuttleless loom, and more particularly to a control device for changing the speed of the removing operation to an optimum value.

[Conventional technology]

The defective yarn removing device automatically removes the defective yarn from the inside of the warp yarn opening when a weft insertion defect occurs, and automatically sets the loom to a restartable state. Defective yarn removing means of this type of device is such that a defective yarn is entangled with a plurality of pins on one roller driven by a driving member such as a motor, or a defective yarn is sandwiched between two rollers, and the rotation of the roller The structure is such that a defective yarn is wound around the outer periphery thereof, or a defective yarn is gripped by a tip portion of a lever, the defective yarn is pulled by moving the lever, and the defective yarn is removed from the opening. The operating speed of the drive member for determining the removing speed of these defective yarn removing operations, that is, the winding speed or the removing speed, is constant regardless of the removing step, or as disclosed in Japanese Patent Application Laid-Open No. 62-184146. The speed was set as a unique speed according to the stage, and all the subsequent removal operations were unchanged and fixed.

[Problems of the prior art]

As described above, when the operation speed for determining the removal speed is fixed in advance, the set value of the speed is not always suitable for the type of the weft yarn, and in that case, the removal operation becomes defective and the repair by the weaver is performed. Is required, and the operation rate of the loom is unnecessarily reduced.

Further, even with the same type of weft yarn, since the yarn physical properties are not uniform in the yarn feeder of each lot, the optimal operation speed for removing defective yarn is not constant, and the operation efficiency of the loom is reduced due to defective removal operation. .

In any case, when the removal speed is excessively small relative to the optimum value, the number of failures of the removal operation is reduced, but one removal time is increased, and the stop time of the loom due to the removal operation is increased. . Conversely, when the operation speed is set to be excessively large, one removal time is shortened, but the number of failures of removal increases, and the repair work by the weaver increases. It will be great. Therefore, the time required for the predetermined number of times of the defective yarn removal processing is required for the weaver to repair due to the time when the defective yarn is automatically removed by the defective yarn removal device and the failure of the defective yarn removal by the defective yarn removal device. Assuming that the loom is stopped during this time, the operating speed must be set so as to minimize this.

[Object of the invention]

Here, an object of the present invention is to set the operation speed of the defective yarn removing device to an optimum value in order to set a short total time required for removing the weft yarn at the predetermined number of times when a predetermined number of weft insertion defects occurs. Setting to prevent a decrease in the operating rate of the loom.

[Solution of the Invention]

To achieve the above object, the present invention provides a driving unit for driving a driving member such as a motor of a defective yarn removing device, in which an operating speed of the driving member, for example, a rotation speed of the motor per unit time is changed to an optimum value. And an evaluation control unit for performing the evaluation.

[Function of the invention]

When a weft insertion failure occurs, the drive unit sequentially operates the defective yarn removing device based on a command from the defective yarn removal control unit. On the other hand, the evaluation control unit positively changes the operating speed of the driving member, for example, the number of rotations per unit time of the motor, to some value for each of the predetermined number of defective yarn removal operations. The total time required for the removal processing is measured, the number of revolutions corresponding to the shortest total time is selected, and in the subsequent removal operation, the rotation speed corresponding to the shortest total time is set in the drive unit of the motor.

Accordingly, in a series of the process of removing the defective yarn, the operation speed is automatically corrected to a value most suitable for removing the defective yarn.

FIG. 1 shows a loom control device 2 and a defective yarn removing device 3 in relation to a control device 1 of the present invention.

The loom control device 2 is provided for controlling the loom, and is connected to the weft insertion detection circuit 4 as well as to the evaluation control unit 6 and the defective yarn removal control unit 7.

When weft insertion failure occurs, weft insertion detection circuit 4
Is a detection sensor 41 provided at the weaving end on the non-yarn supply side,
The weaving machine is stopped by detecting a weft insertion failure and sending a stop signal to the loom control device 2. At this time, the loom control device 2 stops the loom, confirms the stopped state, and then outputs the defective yarn removal control unit 7 by the differential signal S3.
To work. The defective yarn removal control unit 7 operates the drive unit 5 to drive the motor 8 as a driving member provided inside the defective yarn removal device 3 at a predetermined number of revolutions per unit time, thereby removing the defective yarn. The device 3 is operated. As described above, the defective yarn removing device 3 winds the defective yarn 10 by rotating the roller, or moves the defective yarn 10 by moving the lever.
The defective yarn 10 is extracted from the inside of the warp yarn opening 9 at a predetermined removal speed. The loom control device 2
After the completion of the removing operation, the loom is restarted by the loom start signal S2.

On the other hand, the evaluation control unit 6 is assembled as a dedicated circuit for changing the command value of the drive unit 5, that is, the number of revolutions per unit time of the motor 8, or as a part of a computer. It is composed of a time counting means 12, an evaluation circuit 14, and a change circuit 15. The evaluation circuit 14 is a part for executing the evaluation program of FIG. 2, and after inputting an evaluation start command from the loom control device 2,
The evaluation operation is repeated every predetermined number of removal operations.
In the case of this embodiment, the evaluation control unit 6 changes the current rotational speed n by ± Δn every ten removal operations.

First, when the cross stop occurs, the loom control device 2
Sets the counter 12 and the timer 13 to the ON state at the same time as operating the defective yarn removal control section 7 by the operation signal S3. Here, the counter 12 is provided with the defective yarn removal control unit 7.
The number of times of input of the operation signal S3 input to the counter, that is, the number of times of removal of the defective thread, is counted, and at the time when the set value set in advance by the setting unit 11 is `` 10 '', the command signal S1 is sent to the timer 13 and the evaluation circuit 14. Output and reset itself. In addition, the timer 13 accumulates the total time from the input of the operation signal S3 to the output of the start signal S2 of the loom over 10 removal operations, and inputs the command signal S1 from the counter 12. Then, when the start signal S2 of the loom is input, the value of the total time is output to the evaluation circuit 15 and the self is reset. The start signal of the loom
S2 is automatically output when the removal by the defective yarn removing device 3 is performed normally, and when the removal is unsuccessful, it is manually output after a repair work by a weaver.

Then, the evaluation circuit 14 checks the input state of the designation signal S1 for evaluation from the counter 12, and checks the input of the subsequent start signal S2, and then performs 10 times corresponding to the rotation speed n before the change. Enter the total time A required for the defective yarn removal processing of
Remember it. At this time, the change circuit 15 outputs a command value corresponding to the initial rotation speed n to the drive unit 5. In this way, the total time A required for ten defective yarn removing processes at the rotation speed n in step a is obtained.

Thereafter, the evaluation circuit 14 adds the rotation speed Δn for the change to the current rotation speed n and outputs the result to the change circuit 15, so that the change circuit 15 sets the command value of the drive unit 5 to the rotation speed (n + Δn). Set. Thereafter, in the same step b, the total time B required for ten defective yarn removing processes at the rotation speed (n + Δn) is obtained and stored in the evaluation circuit 14. At the next step c, the number of rotations (n-Δn) is set, and similarly, the total time C required for ten defective yarn removing processes at the number of rotations (n-Δn) is stored in the evaluation circuit 14. You.

In this way, at the stage after three steps a → b → c, the evaluation circuit 14 performs the calculation of (AB = X, AC = Y, and then X ≧ Y, X> 0, Perform a magnitude comparison of Y> 0,
According to the result of the magnitude comparison, the rotation speed n may be left unchanged in response to the shortest total time A,
Alternatively, the rotation speed (n + Δn) or the rotation speed (n−Δn) is selected as a new command value corresponding to the shortest total times B and C, and is output to the change circuit 15.

In this way, the evaluation control unit 6 positively changes the rotational speed of the motor 8 in the increasing / decreasing direction, measures the total time required for the predetermined number of defective yarn removing processes at each operation speed, that is, the stoppage time, The rotation speed corresponding to the shortest time is selected, and the setting is made so that the drive unit 5 is operated at the rotation speed.

In the course of the actual operation of the defective yarn removing device 3, the higher the removal speed is, the more the removing operation is performed due to a defective grip of the defective yarn 10 by the defective yarn removing device 3 or a yarn breakage during the removing operation. Is not completed, that is, the automatic restoration by the defective yarn removing device 3 fails, and the occurrence frequency increases. In this case, the weaver checks the state, and extracts the defective thread 10 manually. For this reason, the timer 13 continuously integrates the restoration time by the weaver and the waiting time for the restoration. Therefore, the total time A, B, and C required for the predetermined number of defective yarn removal processes at each rotation speed is equal to the time t1 required for the mechanical removal performed by the defective yarn removal device 3 and the time required for restoration by the weaver. This is the sum with the required time t2. The time t2 includes a waiting time.

Generally, when the rotation speed of the motor 8 increases and the removal speed increases, the frequency of occurrence of accidents such as thread breakage increases, and the success rate of the removal operation decreases. However, on the other hand, the time required for mechanical processing is shortened because the removal operation is accelerated. As a result, the number of repairs by the weaver increases, and accordingly, the waiting time increases due to a decrease in the margin of the weaver. In any case, even if there is a law in such a background, that is, a change in the success rate of the defective yarn removing operation due to an increase or decrease in the number of rotations, an increase or decrease in the number of times of weaving repair or a change in the waiting time, or Even if there is no gender, this evaluation works effectively because it is performed according to reality.

FIG. 3 is a bar graph showing an example of the total time A <the total time B <the total time C for ten times of removing the defective yarn as an example.

At the rotation speed n, the defective yarn removing device 3 succeeds in the removing operation eight times, but fails twice, so that the weaver performs the repairing operation twice. At the rotation speed after the change (n + Δn), the removal operation is fast, and the removal time for one time is short, but only seven times are successful. As a result, the time t2 becomes longer. Furthermore, in the rotation speed after the change (n-Δn), the removal operation is slow, so that one removal time becomes longer, and the total time C is reduced in spite of one short repair work t2 by the weaver. It is the longest. Therefore, in this case, the rotational speed n before evaluation is continuously set as a subsequent command value, and the command value is not changed.

[Other embodiments]

In the above embodiment, the number of rotations is positively changed by ± Δn over two times, but the amount of change in the number of rotations is arbitrary, and the number of times may be two or more.

In addition, the absolute value of the rotation speed Δn for the change can be manually changed each time, and if necessary, only in the direction of automatically increasing according to the operation state of the defective yarn removing device 3. Or only in the decreasing direction.

In each of the above embodiments, the rotational speed of the motor is changed as the operating speed of the driving member of the defective yarn removing device 3. However, the present invention is not limited to this. The operating speed may be changed by changing.

For example, as proposed in JP-A-62-191550,
When removing the defective yarn by hooking the weft on the yarn supply side with the hook provided on the movable part of the reciprocating air cylinder, if the pressure of the compressed air supplied to the air cylinder is positively changed, the hook moves. The speed, ie the operating speed, can be changed. The pressure may be changed by providing a pressure proportional control valve between the pressure fluid source and the on-off valve, and changing a command value to a drive unit that drives the pressure proportional control valve. Further, Japanese Patent Application Laid-Open
As in the case of the defective yarn removing device proposed in -6938, compressed air is injected from the main nozzle and the sub-nozzle to remove the defective yarn connected to the weft in a substantially V-shape toward the non-yarn supply side. Similarly, by changing the supply pressure to each nozzle, the speed of the fluid, that is, the operating speed can be changed. The supply pressure may be changed by providing a pressure proportional control valve between the pressure fluid source and each of the on-off valves, and changing a command value to a drive unit that drives the pressure proportional control valve.

In addition, the evaluation program may be repeatedly executed at all times, or may be executed at predetermined intervals.

〔The invention's effect〕

In the present invention, the operation speed of the driving member such as the motor is set so that the total time required for the process in the process of removing the defective yarn of the predetermined number of times becomes the shortest. The rate is improved. Further, the speed for removing the defective yarn, that is, the operating speed of the driving member is positively changed for each evaluation cycle, and the total time required for removing the defective yarn a predetermined number of times before and after the change is actually measured. Regardless of whether or not there is a law of target increase / decrease, a practically optimal response is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device, and FIGS. 2 (1) and (2).
Is a flowchart of the evaluation program, and FIG. 3 is a graph of required time. DESCRIPTION OF SYMBOLS 1 ... Control device, 2 ... Loom control device, 3 ... Defective yarn removal device, 4 ... Weft insertion detection circuit, 5 ... Drive unit, 6 ...
... Evaluation control unit, 7 ... Defective yarn removal control unit, 8 ... Motor, 9 ... Warp opening, 10 ... Defective yarn, 11 ... Setting device,
12 ... Counter, 13 ... Time measuring means, 14 ... Evaluation circuit, 15
...... Change circuit.

Claims (1)

(57) [Claims] 1. A defective yarn removing device for performing a removing operation at an operating speed of a driving member and extracting a defective yarn from a warp yarn opening by the removing operation, the driving unit driving the driving member at an operating speed according to a command value. And, positively change the command value to the drive unit to some value, measure the total time required for a predetermined number of defective yarn removal processing at each operation speed,
A control device for a defective yarn removing device, comprising: an evaluation control unit that selects an operation speed corresponding to the shortest total time and outputs a command value corresponding to the operation speed to the drive unit.