JP2922550B2 - Control method of 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 method for changing the speed of the removing operation of the defective yarn removing device based on a learning function. .

[Conventional technology]

This kind of defective yarn removing device removes a defective yarn from an opening of a warp yarn when a weft insertion defect occurs, and sets the loom in a state where it can be restarted. Various types of structures have been conventionally proposed as a removing means of the defective yarn removing device.
Most of the removing means is to rotate a pin provided on one roller while tying the defective thread, or to pinch the defective thread between two rollers and wind the defective thread around their outer circumference by rotating the rollers. Alternatively, the defective thread is gripped by the tip of the lever, and the defective thread is extracted from the opening by moving the lever.

The removal speed (winding speed or removal speed) of these removal operations is constant regardless of the removal stage, or set as a unique speed according to the removal stage as disclosed in Japanese Patent Application Laid-Open No. 62-184146. And remained unchanged and fixed for all subsequent removal operations.

[Problems of the prior art]

Thus, when the removal speed is fixed in advance, it does not always match the type of weft yarn even in the subsequent removal operation. That is, when the removal speed is set too low, the removal time becomes longer, the operating rate of the loom decreases, and when the removal speed is set too high, the number of failures of the removal operation increases, The resulting downtime of the loom is increased.

In addition, even with the same type of weft yarn, the yarn physical properties are not uniform due to the difference between lots, so that the optimum removal speed is not constant, and as a result, the operating rate of the loom decreases.

[Object of the invention]

Therefore, an object of the present invention is to prevent a decrease in the operating rate of a loom beforehand by monitoring a removing operation of a defective yarn, changing a removing speed, and outputting an alarm when an abnormality occurs as necessary. .

[Solution of the Invention] FIG. 1 shows an outline of the configuration of an apparatus for realizing the method of the present invention.

The defective yarn removing device 1 to be controlled is set to an optimal removing speed by the speed control device 2.

The defective yarn removing device 1 performs a removing operation by driving a removing device 6 such as a roller or a lever by an output of a driving unit, for example, a rotational force of a motor 3, and removes the defective yarn 4 from the warp yarn opening 5. Removal speed when the motor 3
Is determined by the rotation speed of.

[Function of the invention]

After setting the initial rotation speed of the motor 3, the speed control device 2 takes in data from the defective yarn removing device 1 in the process of performing the removing operation a predetermined number of times and succeeds in the removing operation (success rate = predetermined removal). Success number of times / predetermined removal number, success number = predetermined removal number−unsuccessful number of times of predetermined removal times) The removal rate is increased or decreased so that the removal rate is equal to or higher than the reference success rate or within the range of the reference success rate, and the output of the driving means, for example, the rotation speed of the motor 3 is set to an optimum value. Go. Here, the calculation of the success rate is performed periodically for each predetermined number of removal operations, or continuously for each removal operation, for the past predetermined number of removal operations. Further, when the failure or success of the removal operation is repeated a predetermined number of times, the removal speed is reduced or increased. Further, in the process of calculating the success rate, when the removal operation has failed or succeeded a predetermined number of times, the speed control device 2 preferentially decreases or increases the removal speed and erases the history relating to the previous removal operation. Then, by calculating the success rate of the removing operation again, the present situation is adapted. When the removal operation is in an abnormal state, an alarm is issued and the state is notified to the administrator.
As a result, appropriate measures are taken at an early stage.

First Embodiment (FIGS. 2 to 6) In the first embodiment, an example in which the success rate P of the removal operation is obtained and the removal rate V is changed so that the success rate P becomes a reference success rate P0. And are shown in FIGS. 2 to 6.

In FIG. 2, when a weft insertion failure occurs during weaving, the detection circuit 9 generates a pulse-like weft insertion failure signal A with its sensor 9a and sends it to a counter 11 inside the success rate calculation unit 10. At the same time, it is also sent to the loom control device 8 to stop the weaving operation of the mechanism. The counter 11 outputs a calculation command signal B to the calculator 15 every time the insertion failure signal A is input to the setter 13 for a predetermined removal count H. On the other hand, the counter 12 is connected to the removing operation monitoring unit 17 and counts the number of unsuccessful signals C generated when the removing operation of the defective yarn removing device 1 fails. Therefore, the arithmetic unit 15 receives the operation command signal B, and inputs the count value from the counter 12, that is, the number of failures h, at the time when the loom start signal after the Hth defective yarn processing is input from the loom control device 8. , The success rate P of the removal operation is obtained by the following equation, and this is output to the comparator 16 and the counter 12
Reset.

Therefore, the comparator 16 calculates the success rate P obtained by the above equation.
And the success rate of the standard preset by the setting device 14
Compared with P0, a comparison signal D of “H” level or “L” level is generated or a comparison signal ΔP corresponding to the deviation (P−P0) is generated according to the magnitude result, and the speed change unit Send to 20.

The removing operation monitoring unit 17 is configured as shown in FIG. 3, and detects a failure during the defective yarn removing operation. That is, during a series of removing operations, the sensor 18 optically detects the pulled-in state of the defective yarn 4 inside the defective yarn removing device 1 and generates a detection signal E. This detection signal E
Is amplified by the amplifier circuit 44 and input to one input terminal of the comparison circuit 45. Therefore, the comparison circuit 45 compares the preset reference value F with the detection signal E by the setter 55, generates an "H" level comparison signal G when the thread is present, and outputs this signal to the knot. The signal is sent to the AND gate 48 while being inverted by the circuit 46. On the other hand, the knot circuit 49
By inverting the level of the comparison signal k from the monitoring time setting circuit 32, which will be described later, a signal of “H” level is generated for a predetermined monitoring time T2, and this signal is given to the other input terminal of the AND gate 48. I have. Therefore, while the signal is at the "H" level, if the output of the threadless state, that is, the comparison signal G of the "L" level is output from the comparison circuit 45 due to defective removal or thread breakage, the AND gate 48 Generates an “H” level output signal and drives the driver 52 via the OR gate 51.
Therefore, by closing the relay contact 54, the relay 53 generates an unsuccessful signal C of the removing operation, generates an output for prohibiting restart on the loom controller 8 side, and sends the output to the counter 12. Further, the timer 50 generates a timer signal of “H” level for a predetermined monitoring time T3 when receiving the elapsed signal k of the removal time T1 output from the removal time setting circuit 31 described later. When the output of the thread presence state, that is, the comparison signal G of the “H” level is output from the comparison circuit 5 during the “H” level during the “H” level, the relay 53 is operated and the relay contact
By closing 54, a failure signal C is generated. This state corresponds to that the removing operation of the defective yarn removing device 1 is not sufficiently performed on the defective yarn 4.

Next, the speed changing section 20 is constituted by a digital circuit as shown in FIG. 4 or an analog circuit as shown in FIG.

In FIG. 4, according to the "H" level or the "L" level of the comparison signal D, the switching unit 21 selectively connects the output sides of the setting units 22 and 23 to the input side of the accumulation storage unit 24. Each time the comparison signal D is input once, the change amount ± ΔS of the rotation speed set by the setting devices 22 and 23 is selectively output to the accumulation storage device 24. That is, the obtained success rate P is the standard success rate.
When it is larger than P0, an "H" level comparison signal D is output. The switching unit 21 outputs the change amount of the rotation speed + ΔS to the accumulation storage unit 24 by switching to the output side of the setting unit 22 based on the switching amount. On the other hand, when the success rate P is smaller than the reference success rate P0, the switch 21
, The change amount -ΔS is output to the accumulation storage unit 24. The speed command signal S1 for correction accumulated in the accumulation memory 24 is output to the addition point 27 of the drive unit 26, and sent to the drive amplifier 29 together with the basic speed command signal S0 set by the speed setting unit 28, The rotation speed of the motor 3 is changed to conform to a predetermined removal speed V in accordance with the drive signal S as the output.

Also, when the speed change unit 20 shown in FIG.
The comparison signal ΔP of P0) is sent to the inside of the proportional amplifier 25, and an output proportional to the comparison signal ΔP is output to the integrating memory 24, and sent to the drive unit 26 as a speed command signal S1 for correction. As in the example, the rotation speed of the motor 3 is changed to match the removal speed V.

In this manner, the motor 3 of the defective yarn removing device 1 increases or decreases the rotation speed by the drive signal S that changes according to the success rate P, and thereafter, changes the success rate P based on the changed drive signal S. The removal operation is performed at an optimal removal speed V so as to approach the reference success rate P0.

Thereafter, when the success rate P is calculated again, a similar change operation is performed.

When the rotation speed of the motor 3 is changed, the removal time
Since T1 differs, it is necessary to change the removal time T1 and the monitoring time T2. Therefore, as shown in FIG. 2, the time changing unit 30 uses the removal time calculator 33 to calculate the reference time T0 from the rotation speed (removal speed) of the motor 3 based on the drive signal S and the set weave width. Is calculated and sent to the removal time setting circuit 31 and the monitoring time setting circuit 32 in FIG.
The removal time setting circuit 31 sets the adder 42 to the reference time T0,
The time obtained by adding the set value ΔT1 set in 41 is the removal time T1
And sent to the comparator 43. Monitoring time setting circuit 32
The monitoring time T2 is obtained by subtracting the set value ΔT2 set by the setting device 34 from the reference time T0 by the subtractor 35, and is sent to the comparator 39.

When a weft insertion failure occurs, the monitoring time setting circuit 32 operates the reference pulse train generator 37 by inputting the drive command signal m for the motor 3, and after the monitoring time T2 elapses, the comparator 39 outputs the "H" level. The comparison signal k is output to the removal operation monitoring unit 17. On the other hand, the removal time setting circuit 31
The reference pulse train generator 36 is operated by inputting the drive command signal m from the defective yarn removal control unit inside the controller.
When the clock pulse counted by the counter 40 coincides with the time T1, the comparator 43 outputs a removal time elapse signal g to the loom control device 8, the removal operation monitoring unit 17, and the like. In response to this, the defective yarn removing device 1 stops the motor 3, and thereafter, the loom control device 8 outputs an automatic start signal unless a restart prohibition signal is input from the removing operation monitoring unit 17. Automatically start the loom. If a restart prohibition signal has been input, an automatic start signal is not output, and the output of a start signal by a manual button is waited.

Embodiment 2 (FIG. 2) In this embodiment 2, the success rate W is obtained, and the removal speed V of the defective yarn removing device 1 is gradually increased so that the success rate P becomes equal to or higher than the reference success rate P0. This is an example of a reduction.

In FIG. 2, the comparator 16 outputs the comparison signal D or the comparison signal ΔP only when the success rate P falls below the reference success rate P0. Therefore, when the speed change unit 20 receives the comparison signals D and ΔP, the speed change unit 20 decreases the drive signal S of the drive unit 26 by a predetermined change amount ΔS, so that the removal success rate P becomes equal to or higher than the reference success rate P0. The removal speed V is gradually reduced so as to be as follows.

Third Embodiment (FIG. 7) The third embodiment is an example in which the removal rate V is changed so that the success rate P falls within a predetermined range.

In the case of this embodiment, as shown in FIG.
Is added to the parallel comparator 56 and a setting device 57 for setting the upper limit success rate P1. When the calculated success rate P exceeds the success rate P1, the comparator 56 and the speed changing unit 20 are used. When the drive signal S is increased by the change amount ΔS and falls below the lower limit success rate P0 set in the setting unit 14, the other comparator 16 operates to subtract the drive signal S by the change amount ΔS. As a result, the success rate P is controlled to always fall between the upper limit success rate P1 and the lower limit success rate P0. A limiter is connected between the drive unit 26 and the motor 3 to output an alarm when the drive signal S exceeds an allowable range regulated by the limiter. A similar function can be obtained by prohibiting the output of the command value.

Embodiment 4 (FIG. 8) Embodiment 4 is an example in which the removal speed V is reduced or an alarm is output when the removal operation has failed consecutively a predetermined number of times.

In FIG. 8, the counter 58 counts the number of unsuccessful signals C from the removing operation monitoring unit 17, and after the successful removal of the defective yarn,
The count value is reset by the automatic start signal U of the loom output from the defective yarn removal control device 60 to the loom control device 8, and when the count value reaches the set value of the setting device 59, the speed changing section 20 is reset. Is notified to the operator by subtracting the drive signal S by a predetermined change amount ΔS via the control signal or by outputting an alarm signal Q simultaneously with the subtraction operation.

Fifth Embodiment (FIG. 8) In the fifth embodiment, when the removing operation has succeeded a predetermined number of times in succession, the removing speed is sequentially increased.

In FIG. 8, by exchanging the connections of the two inputs to the counter 58, the removal speed V is sequentially increased when the removal operation has succeeded a predetermined number of times in succession.

[Sixth Embodiment (FIGS. 2, 8, and 9)] In the sixth embodiment, in the process of calculating the success rate P, when the removal operation has failed a predetermined number of times, the removal speed V is given priority. Is reduced by the change amount ΔS, the memory of the land history relating to the removing operation is erased, and thereafter, the success rate P of the removing operation is calculated again.

2 and FIG. 8, this can be realized by a configuration in which the output signal of the counter 58 is branched and input to the reset signal sides of the counters 11 and 12.

FIG. 9 shows a specific operation state of this embodiment. In a series of removal steps, the removal rate V is automatically changed so that the success rate P becomes 4/6, and if the removal operation fails twice consecutively, the removal rate V is preferentially changed by ΔV Only slowed down. In this way, the removal rate V is automatically adjusted in an increasing or decreasing direction depending on the degree of continuous failure.

[Seventh Embodiment (FIGS. 2 and 8)] In the seventh embodiment, in the process of calculating the success rate P, when the removal operation succeeds a predetermined number of times, the removal speed is preferentially increased, and This is an example in which the storage of the history relating to the removing operation is deleted, and thereafter, the success rate P of the removing operation is calculated again.

Therefore, this embodiment is different from the sixth embodiment in that the removal speed V is increased and that the connection of the two inputs to the counter 58 is switched, and can be realized by a similar circuit configuration.

Eighth Embodiment (FIG. 10) As shown in FIG. 10, the eighth embodiment is an example in which the fourth embodiment and the fifth embodiment are combined. The removal speed V is reduced by the setting device 59, an alarm is output as necessary, and when the removal operation is successfully performed a predetermined number of times continuously, the counter 61 and the setting device 62
Is an example in which the removal speed V is gradually increased.

(Other embodiments)

It should be noted that, even if the counter 12 is not configured to automatically output the removal operation failure signal C, the counter 12 can be manually operated by the weaver every time the removal fails.
May be output to

In each of the above embodiments, the rotational force of the motor is used as the output of the driving member of the defective yarn removing device 1,
The present invention is not limited to this, and may use a compressive fluid force. For example, as disclosed in Japanese Patent Application Laid-Open No. 62-191550, when a weft is hooked on the yarn supply side by a hook provided on a movable portion of a reciprocating air cylinder to remove a defective yarn, the compression supplied to the air cylinder By changing the air pressure, the object of the present invention is achieved. The pressure can be changed by providing a pressure proportional control valve between the pressure fluid source and the on-off valve and controlling the drive signal S to the pressure proportional control valve.
At this time, the sensor 18 may be provided at an appropriate position between the main nozzle and the yarn feeding cutter. 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, the object of the present invention can be achieved by changing the supply pressure to each nozzle based on the obtained success rate P. 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 controlling the drive signal S to the pressure proportional control valve. The sensor 18 is provided at a position where the tip of the defective yarn in the suction tube provided on the non-yarn supply side should reach, and the success / failure of the removal is determined based on whether or not the presence of the yarn is detected within a predetermined time. You just have to make a decision.
The object of the present invention is also achieved in other known defective yarn removing devices by changing the output of the driving member based on the success rate P of the removing operation and controlling the removal speed of the defective yarn from the opening. Is done.

〔The invention's effect〕

In the present invention, the removal operation of the defective yarn is monitored each time, and the removal speed is changed according to the change in the success rate of the removal operation, and is set to an appropriate speed value. An optimal removing operation can be expected, and as a result, the operating rate of the loom can be increased.

Also, in the process of calculating the success rate, an alarm is output for an abnormal character, thereby enabling an artificially appropriate response.

[Brief description of the drawings]

1 is a conceptual block diagram of a defective yarn removing device and a speed control device, FIG. 2 is a block diagram of a speed control device according to the first embodiment, FIG. 3 is a block diagram of a removing operation monitoring unit, 4th
FIG. 5 and FIG. 5 are block diagrams of a speed changing unit, and FIG. 6 is a block diagram of a removal time setting circuit and a monitoring time setting circuit. FIG. 7 is a block diagram of the third embodiment, and FIG.
FIG. 9 is a block diagram of the sixth embodiment, FIG. 9 is a block diagram of the operation of the sixth embodiment, and FIG. 1 ... defective yarn removing device, 2 ... speed control device, 3 ... motor, 4 ... defective yarn, 5 ... opening, 8 ... loom control device, 9 ... detection circuit, 10 ... success rate calculation Department, 11, 12 ……
Counter, 15 arithmetic unit, 16 comparator, 17 removing operation monitoring unit, 20 speed changing unit, 26 driving unit, 30 time changing unit, 31 removal time setting circuit, 32 Monitoring time setting circuit.

Claims (5)

(57) [Claims] When a weft insertion failure occurs, a removing operation is performed by driving the removing means at a removing speed based on an output of the driving means, and the removing operation removes the defective yarn from the warp yarn opening. A method of controlling a defective yarn removing device, comprising: obtaining a success rate of a removing operation in a single removing operation; and controlling a removing speed such that the success rate becomes a target success rate. 2. A defective yarn removing device for driving a removing means at a removing speed based on an output of a driving means to perform a removing operation when a weft insertion failure occurs, and removing the defective yarn from a warp yarn opening by the removing operation. A method for controlling a defective yarn removing device, wherein the removing speed is reduced when the removing operation has failed successively a predetermined number of times. 3. A defective yarn removing device for driving a removing means at a removing speed based on an output of a driving means to perform a removing operation when a weft insertion failure occurs, and removing the defective yarn from a warp yarn opening by the removing operation. A method for controlling a defective yarn removing device, wherein the removing speed is increased when the removing operation succeeds a predetermined number of times in succession. 4. A defective yarn removing device for driving a removing operation at a removing speed based on an output of a driving means to perform a removing operation when a weft insertion failure occurs, and removing the defective yarn from a warp yarn opening by the removing operation. Determine the success rate of the removal operation in the number of removal operations, control the removal rate so that this success rate becomes the target success rate, and when the removal operation has failed a predetermined number of times continuously in the process of calculating the success rate, A method for controlling a defective yarn removing device, wherein a removing speed is preferentially reduced and a history relating to a removing operation up to that time is deleted. 5. A defective yarn removing device which drives a removing means at a removing speed based on an output of a driving means to perform a removing operation when a weft insertion failure occurs, and removes a defective yarn from a warp yarn opening by the removing operation. Determine the success rate of the removal operation in the number of removal operations, and control the removal rate so that this success rate becomes the target success rate, and when the removal operation succeeds a predetermined number of times continuously in the process of calculating the success rate, A method for controlling a defective yarn removing device, wherein a removing speed is preferentially increased to erase a history relating to a removing operation up to that time.