JPH0610241A - Method for controlling letting off - Google Patents

Abstract

PURPOSE:To prevent the operating efficiency of a loom from deteriorating as much as possible and carry out the sufficient picking of weft yarn. CONSTITUTION:The objective method for controlling the letting off of warp yarn is to control the rotational speed of a letting off motor based on a sensed warp yarn tension and approach the warp yarn tension to the target value. In this method, the object is achieved by setting the target value of the warp yarn tension for each picking density and changing over the target value of the warp yarn tension to the one corresponding to the picking density after changing the target value in changing the picking density.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding control method for a loom.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 44-28270 and Japanese Patent Laid-Open No. 62-62959 disclose changing the weft thread driving density by changing the winding speed while the loom is in operation. .

On the other hand, the above-mentioned technique does not describe a delivery control system. That is, in the above technique, the feeding control system controls the rotation speed of the feeding beam so that the tension of the warp thread always reaches the target value, but this target value is always fixed regardless of the weft thread driving density. ing.

[0004]

[Problems of the prior art] When the target value of the warp thread tension is fixed, the weft thread is not sufficiently driven for a certain value of the driving density, but rather, the driving thread is sufficiently driven for all the driving density. If the target is set to a high value, warp yarn breakage occurs frequently, and there is a problem that the operating rate of the loom decreases.

[0005]

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to carry out sufficient driving while reducing the operating rate of the loom as much as possible.

[0006]

Therefore, the present invention provides a warp yarn tension control method for controlling the rotational speed of a warp yarn discharge motor based on the detected warp yarn tension to bring the warp yarn tension closer to a target value. The target value is set in advance, and when the driving density is changed, the target value of the warp thread tension is switched to the target value corresponding to the changed driving density to achieve the above object.

[0007]

[Configuration of Control System] First, FIG. 1 shows a weaving control device 1
The overall construction of is shown with the warp thread 2 path.
The warp yarn 2 is wound around the outer circumference of the delivery beam 3 in the form of a sheet, becomes almost horizontal via the tension roll 4, and when the heald 5 forms the opening 6, the weft yarn 7 and the weft yarn 7 are formed at the weaving position of the opening 6. It is woven as a woven cloth 9 by crossing and a hammering motion of the reed 8. Woven fabric 9 includes breast beam 10 and winding roll 11
Then, it is wound around the cloth beam 13 through the guide roll 12.

The delivery beam 3 and the take-up roll 11 are driven by a variable-speed delivery motor 14 and a take-up motor 15 with gears 16 and 17 interposed therebetween. These feed motors 14
The take-up motor 15 and the take-up motor 15 are controlled by the delivery control device 21 and the take-up control device 22, respectively.

The delivery control device 21 detects the tension of the warp thread 2 and controls the rotation speed of the delivery motor 14, that is, the delivery speed of the warp thread 2 on the basis of the detected tension change. Tension setting device 23,
Addition point 24, PI calculator 25, speed calculator 49,
A speed command switch 26, an addition point 27, and a drive amplifier 28 are provided. The tension of the warp thread 2 is detected by a tension detector 29 such as a load cell connected to the tension roll 4, and the addition point 2 is detected.
4 is applied as a negative signal. In addition, the feed motor 1
The rotation speed of 4 is detected by the tachogenerator 30, and the addition point 2 is added to form a feedback control system.
7 is applied.

Further, the winding control device 22 controls the winding speed of the woven cloth 9 and, in order to change the driving density B of the woven cloth 9, the density setting device 31 and the density controller 32.
Is equipped with. The former density setter 31 is connected on the input side to the timing generator 56 of the crankshaft 19 of the loom driven by the locomotive drive motor 18, and on the output side the speed command switch 26 and speed calculator. Connected to the container 49 and the density controller 32. The latter density controller 32 is connected to the pulse generator 33 of the winding motor 15 and the shaft encoder 20, and is connected to the winding motor 15 on the output side.

Next, FIG. 2 shows an internal structure of the speed calculator 49 and a connection relationship between the speed calculator 49 and other components. The speed calculator 49 includes a calculation circuit 63 interposed between the PI calculator 25 and the speed command switch 26, a rotation speed detector 61 connected to the input side of the calculation circuit 63, and a winding diameter detector 6.
It is composed of two. The external proximity switch 65 and the initial winding diameter setting device 67 are connected to the input side of the winding diameter detector 62, and the rotation speed setting device 68 is connected to the input side of the rotation speed detector 61. ing. The rotation speed detector 61 and the winding diameter detector 62 are both connected to the timing generator 56 on the input side. The timing generator 56 detects the rotation angle of the crankshaft 19 of the loom and gives the timing necessary for calculating the speed. The density input device 66 is connected to the winding diameter detector 62 as well as the input end of the arithmetic circuit 63.

[0012]

[Functions of Control System] During normal weaving operation, the winding control device 22 operates the winding motor 15 in proportion to the crankshaft 19 in synchronization with the frequency division ratio set by the output of the density setting device 31. Then, the winding roll 11 is rotated at a predetermined winding speed. In this way, the woven cloth 9
Is wound around the outer periphery of the cloth-wrapped beam 13 as time passes.

On the other hand, the feed-out control device 21 increases or decreases the rotational speed of the feed-out motor 14 by using the target tension set by the tension setter 23 as a basic condition for the operation, and maintains the tension of the warp yarn 2 at the target value. , Is being sent at a predetermined sending speed. Then, the change in tension of the warp yarn 2 is converted into an electric tension signal by the tension detector 29, and becomes an input for tension correction of the PI calculator 25 from the addition point 24. Therefore, the PI calculator 25 responds to the change in the tension of the warp yarn 2 and follows the target value under the proportional operation and the integral operation.

The tension of the warp thread 2 is determined by the crankshaft 19
In one rotation of the above, due to the opening movement and the subsequent beating movement, it is instantaneously increased. However, the influence can be removed by obtaining the average value of the tension values at a plurality of predetermined timings. When the average tension is gradually increased, for example, the PI calculator 25 gradually increases the rotation speed of the feed motor 14 and proportionally sets the feed amount of the warp yarn 2. In this way, the tension of the warp yarn 2 is always set to the target tension regardless of the progress of weaving.

During this time, the density setting device 31 sends a signal of the preset driving density B to the density controller 32, the speed calculator 49 and the speed command switch 26 in synchronization with the rotation of the crankshaft 19. , The winding speed and the feeding speed corresponding to the driving density B are set. Therefore, the rotation speeds of the feed motor 14 and the winding motor 15 are set to appropriate speeds according to the predetermined driving density B.

During this time, the rotation speed detector 61 receives the signal of the rotation speed no of the crankshaft 19 and detects the rotation speed n,
The information is sent to the arithmetic circuit 63. The winding diameter detector 62 receives the signals of the initial winding diameter Do and the driving density B as well as the rotation signal of the gear 16 from the proximity switch 65 for each reference rotation position, and inputs the rotation signal of the gear 16 to the winding diameter of the warp yarn 2 in the delivery beam 3. D is detected. In this embodiment, the implantation density is B1. Here, the winding diameter D is obtained by the following formula.

[0017]

[Equation 1]

However, m, Pw, and PL in the above equation are as follows. m: Reduction ratio of gear 16 Pw: Number of gear rotation pulses PL: Number of loom rotation pulses

Then, the arithmetic circuit 63 inputs the information of the driving density B1 set in the density input device 66 in addition to the information of the rotational speed n and the winding diameter D, and first calculates the basic speed No of the feed. Ask. Here, the basic speed N
The value o can be obtained by the following equation, where m is the speed reduction ratio from the delivery motor 14 to the delivery beam 3.

[0020]

[Equation 2]

Further, the signal component of the output Mp from the PI calculator 25 is superposedly applied at a constant rate with respect to the basic velocity No to generate a velocity command signal N, which is then fed to the velocity command switch. Send to 26. The speed command signal N is
When the ratio to the basic speed No is 1/100,
It is represented by the following formula.

[0022]

[Equation 3]

[0023]

[Specific Examples of Each Part] FIG. 3 shows specific configurations of the density setting device 31 and the speed command switching device 26. The density setting device 31 includes a density switching command circuit 34, two setting circuits 35 and 36, and a switching circuit 37 which are connected to the timing generator 56. The speed command switch 26 is a transmission path for the speed command signal N of the speed calculator 49, and has a variable resistor 38 for voltage division and relay contacts 41, 42 of the relays 39, 40.
Further, in order to drive these relays 39, 40, drivers 43, 44 controlled by the density switching command circuit 34 and a knot circuit 45 are provided.

The density switching command circuit 34 synchronizes with the signal of the timing generator 56, that is, the density switching command signal of "H" level or "L" level as preset, in synchronization with the rotation of the crankshaft 19 of the loom. Is generated, which operates the switching circuit 37 and causes the driver 4
The relay contacts 41 and 42 are alternately set to the ON state by selectively driving either one of the 3 and 44. In this way, the two implantation densities B1 and B2 from the setting circuits 35 and 36 are alternately output to the density controller 32 via the switching circuit 37.

On the other hand, the speed command signal N of the speed calculator 49
Is divided by the variable resistor 38 and relay contacts 41,
By the alternating ON state of 42, the implantation densities B1, B2
Is sent to the drive amplifier 28 in synchronism with the switching. Note that here, the implantation density B1 of the one setting circuit 35 is larger than the implantation density B1 of the other setting circuit 36.
The circuit configuration is simplified by limiting the setting so that 2 becomes large.

Here, the basic expression of the above-mentioned sending speed, that is, the basic speed No [rpm] and the speed command signal N
[Rpm] is, as already described, expressed by the following formula as the driving density B1 [number / cm] set on the sending side.

[0027]

[Equation 4]

However, the symbols in the formula are as follows. m: reduction ratio of gear 16 n: number of revolutions of crankshaft 19 of the loom [rpm] D: winding diameter of delivery beam 3 [cm] Mp: output of PI calculator 25

On the other hand, the voltage division ratio of the variable resistor 38 is set to V / Vo.
Then, when the setting circuit 35 is selected, that is, when the implantation density B = B1, the voltage V = Vo, and when the setting circuit 36 is selected, that is, when the implantation density B = B2, the voltage is V = (B1 / B2) V
If o, the input Nin to the drive amplifier 28 is given by the following equation.

[0030]

[Equation 5]

Therefore, in each case, the inputs Nin1 and Nin2 to the drive amplifier 28 are respectively expressed by the following equations.

[0032]

[Equation 6]

In this way, when the implantation density B is switched, the input of the drive amplifier 28 immediately becomes the ratio (1 / B
Since the voltage value is changed to 1 or 1 / B2), the delivery control device 21 immediately follows it and rotates the delivery motor 14 at a predetermined speed.

Although the variable resistor 38 is provided only on the side corresponding to the setting circuit 36 in FIG. 3, this variable resistor 38 is also provided on the side corresponding to the setting circuit 35. May be. Then, those settings may be set to values obtained by multiplying the voltage division ratio by a constant coefficient in order to further speed up the response. Further, in the above specific example, the voltage of the speed command is divided, but this voltage value may be output while being amplified as needed in combination with an appropriate amplifier circuit.

The specific example of FIG. 4 shows an example in which a programmable gain amplifier circuit 46 is used in place of the variable resistor 38. The configuration of FIG. 3 has the drawback that the variable resistor 38 is not set accurately, which causes the feed-out control to not correspond precisely to changes in the density control. However, in the case of FIG. 4, the amplification degree is automatically determined by the division circuit 47 from the set value of the implantation density B itself,
By operating the gain switching circuit 48, the gain of the programmable gain amplifier 46 is set to an appropriate value. Therefore, in this specific example, adjustment or setting of the variable resistor 38 is not required.

In FIG. 5 and FIG. 6, the density switching command circuit 34 does not divide the speed command signal N input from the speed calculator 49 by the speed command switching device 26, but divides it.
When the switching circuit 37 switches the driving densities B1 and B2 in response to the density switching command signal, the speed calculator 49 causes the driving density B1 or the driving density B to be changed.
Input the signal of 2 directly from the above basic equation to the basic speed No.
An example is shown in which is calculated. Of course, the speed calculator 49 superimposes the output Mp of the PI calculator 25 at a constant rate on the obtained basic speed No and outputs an appropriate speed command voltage.

Further, in FIGS. 7 and 8, the driving density B sent from the driving density command generator 50 is used.
The value itself of (B1, B2) is input, and the density input circuit 5
This is an example of inputting to the speed calculator 49 through 1. Here, the velocity calculator 49 obtains the basic velocity No using the implantation densities B1 and B2 as in the third embodiment, and PI
The output Mp of the calculator 25 is added in a superimposed manner.

[0038]

Embodiments FIGS. 9 to 12 show an embodiment in which the warp thread tension is changed when the driving density is changed based on the delivery control method of the present invention.

First, in the embodiment shown in FIGS. 9 and 10, the voltage of the tension signal from the tension detector 29 is divided according to the driving density B to change the detection value. By this, when the driving density is B2, it is intended to artificially increase the warp thread tension more than when it is B1, and the tension switching circuit 52 is interposed between the tension detector 29 and the addition point 27. The variable resistor 38a and the relay contacts 41a and 42a are incorporated.

When changing the density, for example, the implantation density B2
However, if the warp yarn 2 has a high tension and the tension of the warp yarn 2 is low, the weaving cloth moves to the winding side and escapes at the time of beating, that is, flapping of the weaving cloth occurs.
This embodiment is effective in increasing the tension of the warp threads 2 and preventing the fluttering of the cloth before switching to the high density.

Next, the embodiment shown in FIG. 11 is based on the one shown in FIG.
7 shows an example of selectively outputting by. In this case, the set value of the tension as the target value is changed, and
The same effect as that of the embodiment shown in FIG. 10 can be obtained, and the speed of the feed motor 14 is synchronized with the change of the driving density B and quickly follows.

Further, the embodiment shown in FIG. 12 is based on the concrete example shown in FIG. 7, and has a driving density / tension value command generator 55.
Is an example in which the driving density B and the target tension value are directly input to the driving density input circuit 51 and the tension input circuit 54, respectively. In this embodiment, the input of the PI calculator 25 is
It is given as a deviation between the target tension value given by the tension input circuit 54 and the actual tension value detected by the tension detector 29.

As is apparent from the above-described embodiments, the target value of the warp thread tension can be switched by means of switching the tension set value itself, and the tension detector 29 does not change the tension set value. Also included is means for switching the voltage division ratio of the voltage of the tension signal. When the voltage of the detected tension signal is divided, the detected tension is smaller than the actual tension due to the partial pressure, and therefore the target value is relatively lower than the setting value of the tension setter 23 by the amount of partial pressure drop. Get higher

[0044]

According to the present invention, when the implantation density is changed,
Since the warp thread tension is changed to a value suitable for the driving density, it is possible to drive the weft thread sufficiently without unnecessarily reducing the operating rate of the loom.

[Brief description of drawings]

FIG. 1 is a block diagram of a change weave control device.

FIG. 2 is a block diagram of a speed calculation part.

FIG. 3 is a block diagram of a speed switching portion.

FIG. 4 is a block diagram of a speed setting portion.

FIG. 5 is a block diagram of a main part of a control system.

FIG. 6 is a block diagram of a speed calculation part.

FIG. 7 is a block diagram of a main part of a control system.

FIG. 8 is a block diagram of a speed calculation part.

FIG. 9 is a block diagram of a control system.

FIG. 10 is a block diagram of a main part of a density / tension switching portion.

FIG. 11 is a block diagram of a main part of a control system.

FIG. 12 is a block diagram of a main part of a control system.

[Explanation of symbols]

 1 Change weaving control device 2 Warp yarn 3 Feeding beam 11 Winding roll 14 Feeding motor 15 Winding motor 21 Feeding control device 22 Winding control device 23 Tension setting device 25 PI calculator 26 Speed command switch 27 Addition point 28 Drive amplifier 31 Density setting device 32 Density controller 34 Density switching command circuit 35 Setting circuit 36 Setting circuit 37 Switching circuit 38 Variable resistor for voltage division 41 Relay contact 42 Relay contact 46 Programmable gain amplifier 47 Division circuit 48 Gain switching circuit 49 Speed calculation vessel

Claims (1)

[Claims] 1. In a feed-out control method in which the rotational speed of a feed-out motor is controlled based on the detected warp thread tension to bring the warp thread tension close to a target value, a target value of the warp thread tension is set for each driving density. ,
A feed-out control method characterized in that, when the driving density is changed, the target value of the warp thread tension is switched to a target value corresponding to the changed driving density.