JP3726474B2 - Automatic tension control device and automatic tension control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic tension control device and an automatic tension control method suitable for use in a device for winding or rewinding a metal strip or a work material such as paper or film on a roll.
[0002]
[Prior art]
FIG. 4 is a block diagram showing a schematic configuration of a conventional dancer roll type winding / rewinding apparatus. In the figure, 1 is a line drive roll, 2 is a dancer roll, and 3 is a winding roll. A processing material 4 such as a metal strip, paper, or film is sent out at a predetermined speed by a line drive roll 1 and is taken up by a take-up roll 3 via a dancer roll 2 that can move up and down. The dancer roll 2 prevents the processed material 4 from loosening when the processed material 4 is wound on the winding roll 3.
[0003]
By the way, since the dancer roll type winding / rewinding device uses an AC servo motor, the follower of the dancer roll 2 during operation is slow, the swing of the dancer roll 2 becomes large, and tension unevenness is generated not a little. Resulting in. Therefore, based on the line speed V detected by the speed detector 5 attached to the line drive roll 1 and the position P of the dancer roll 2 detected by the position sensor 6, the winding roll 3 is synchronously operated by the AC servo motor 7. The dancer roll 2 is controlled so as to keep the position constant, and the tension applied to the workpiece 4 is kept constant.
[0004]
[Problems to be solved by the invention]
However, since the winding diameter of the winding roll 3 changes during operation, in order to feed the workpiece 4 at a constant line speed, the rotation of the winding roll 3 is controlled synchronously according to the change of the winding diameter. However, when the control is performed using the AC servo motor as described above, a response delay occurs in the control, and it is difficult to keep the line speed constant. For this reason , it is necessary to move the dancer roll 2 up and down so that the workpiece 4 does not loosen. However, the dancer roll 2 also has a problem in that the response of the arm is delayed and the touch of the arm is increased.
[0005]
The present invention has been made in view of the above-described circumstances, and provides an automatic tension control device and an automatic tension control method capable of improving the followability to changes in the winding diameter and suppressing the shake of the dancer roll. It is intended to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, in the invention according to claim 1, a work material is provided while having a dancer roll between a line drive roll and a winding / rewinding roll, and performing position control of the dancer roll. An automatic tension control device for a winding / rewinding device that performs winding / rewinding, and a speed calculation means for calculating a feed rate of a work material by the line drive roll, and winding of the winding / rewinding roll A winding diameter calculating means for calculating a diameter, and a rotation speed calculating means for calculating a necessary rotation speed of the winding / rewinding roll based on the feed speed by the speed calculating means and the winding diameter by the winding diameter calculating means; A position detecting means for detecting the position of the dancer roll; and a correcting means for correcting the required rotational speed by the rotational speed calculating means based on the position of the dancer roll by the position detecting means; Characterized by a control means for controlling the rotation of the winding-unwinding rolls in accordance with the needs rotational speed corrected by the correcting means.
[0007]
According to a second aspect of the present invention, in the automatic tension control device according to the first aspect, the first pulse generating means for generating a first pulse signal having a period corresponding to the rotational speed of the line drive roll; Second pulse generating means for generating a second pulse signal having a period corresponding to the rotation speed of the winding / rewinding roll, and the winding diameter calculating means is generated by the first pulse generating means. The winding diameter of the winding / rewinding roll is calculated based on a first pulse signal and a second pulse signal generated by the second pulse generating means.
[0008]
Moreover, in order to solve the above-described problem, in the invention according to claim 3, a dancer roll is provided between the line drive roll and the winding / rewinding roll, and the position control of the dancer roll is performed. An automatic tension control method in a winding / rewinding apparatus for winding / rewinding a workpiece material, the first step of calculating a feed rate of the workpiece material by the line drive roll, and the winding / rewinding method A second step of calculating a winding diameter of the roll, a third step of calculating a necessary rotational speed of the winding / rewinding roll based on the delivery speed and the winding diameter, and the necessary rotational speed. It comprises a fourth step of correcting at the position of the dancer roll, and a fifth step of controlling the rotation of the winding / rewinding roll according to the corrected required rotational speed.
[0009]
In this invention, the speed calculation means calculates the feed speed of the work material by the line drive roll, and the winding diameter calculation means calculates the winding diameter of the winding / rewinding roll. Next, the required number of rotations of the winding / rewinding roll is calculated by the rotation number calculation means based on the feed speed and the winding diameter. Then, after correcting the required rotational speed at the position of the dancer roll by the correcting means, the control means controls the rotation of the winding / rewinding roll according to the corrected required rotational speed. Therefore, it is possible to improve the followability with respect to the change in the winding diameter of the winding / rewinding roll and to suppress the shake of the dancer roll.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a winding device using a dancer roll to which an automatic tension control method for a dancer roll according to the present invention is applied. The parts corresponding to those in FIG. In the figure, reference numeral 10 denotes an encoder (pulse generator) attached to the line drive roll, and supplies a pulse signal n1 corresponding to the rotational speed of the line drive roll 1 to the winding diameter calculation unit 12 and the line speed calculation unit 13. . Reference numeral 11 denotes an encoder (pulse generator) attached to the winding roll 3, and supplies a pulse signal n <b> 2 corresponding to the rotational speed of the winding roll 3 to the winding diameter calculation unit 12. FIG. 2 is a conceptual diagram showing a pulse signal n1 output from the encoder 10 and a pulse signal n2 output from the encoder 11.
[0011]
The winding diameter calculation unit 12 integrates the pulse amount for each n rotations of the winding roll based on the pulse signals n1 and n2, and calculates the ratio according to the following formula to thereby obtain the winding diameter D of the winding roll 3. Is supplied to one input terminal of the divider 14.
[0012]
[Expression 1]
D = D0 × (Δl1 / Δl2) × (N1 / N2)
Here, D: winding diameter (m), D0: winding core diameter (m), Δl1: resolution of drive roll encoder (m / pulse), Δl2: winding encoder in an empty core state Resolution (m / pulse), N1: Pulse integration amount of the line drive roll encoder during n rotation of the winding roll (pulse), N2: Pulse integration amount of the winding roll encoder during n rotation of the winding roll (pulse) It is.
[0013]
Next, the line speed calculation unit 13 calculates the line speed V from the pulse signal n1 output from the encoder 10 and supplies the line speed V to the other input terminal of the divider 14. The divider 14 calculates the rotational speed R of the winding roll 3 according to the following equation according to the winding diameter D and the line speed V.
[0014]
[Expression 2]
R = V / (2πD)
Here, R: rotational speed of the original fabric, V: line speed, D: winding diameter. FIG. 3 is a conceptual diagram showing a change in the rotational speed R of the winding roll 3 with respect to a change in the winding diameter D. In order to make the line speed V constant and to reduce the vertical fluctuation of the dancer roll 2, in other words, to keep the tension on the workpiece 4 constant, the higher the winding diameter D of the winding roll 3, the higher the rotational speed. It can be seen that R needs to be reduced.
[0015]
The comparator 15 outputs a difference PD between the position signal P corresponding to the position of the dancer roll 2 output from the position sensor 6 and the set position Pref. The gain 16 gives a predetermined gain to the rotational speed R of the winding roll 3, and the gain 17 gives a predetermined gain to the difference PD related to the dancer roll 2. The subtractor 18 calculates a drive signal for synchronously driving the take-up roll 3 by subtracting the difference PD from the rotation speed R of the take-up roll 3, and supplies it to the pulse width modulator 19. The pulse width modulator 19 generates a pulse signal having a pulse width corresponding to the drive signal and supplies it to the F / V converter 20. The F / V converter 20 generates a voltage corresponding to the frequency of the pulse signal, and drives the servo motor 7 via the SD 21. The servo motor 7 operates the winding roll 3 synchronously.
[0016]
According to the above-described configuration, the winding diameter calculation unit 12 calculates the winding diameter D of the winding roll 3 according to the above formula 1 based on the pulse signals n1 and n2 from the encoders 10 and 11. Further, the line speed calculation unit 13 calculates the line speed V from the pulse signal n1 output from the encoder 10. Then, according to the winding diameter D and the line speed V, the divider 14 calculates the rotational speed R of the winding roll 3 by the following equation. This rotational speed R is the rotational speed of the winding roll 3 required at the current line speed V. Then, the rotational speed of the winding roll 3 is controlled by the servo motor 7 in accordance with the rotational speed R. At this time, correction is performed according to the difference PD between the actual position P and the set position Pref so that the dancer roll 2 is kept at a predetermined position (set position). Thereby, since the winding roll 3 is synchronously operated with the required number of rotations according to the current line speed, the movement of the dancer roll 2 is minimized and stable operation is possible.
[0017]
Thus, in the present invention, the current diameter D of the winding roll 3 is calculated, and the rotation speed R of the winding roll 3 required by the current line speed V is obtained. Therefore, the necessary rotation speed of the winding roll 3 can be determined instantaneously by mainly performing synchronous rotation and correcting the position error of the dancer roll. Further, by rotating the take-up roll 3 at the required rotational speed at the synchronous speed, the movement of the dancer roll 2 can be suppressed to a minimum, and a stable operation is possible.
[0018]
【The invention's effect】
As described above, according to the present invention, according to the present invention, the rotational speed calculating means calculates the processing material feed speed by the line drive roll calculated by the speed calculating means, and the winding / rewinding calculated by the winding diameter calculating means. Based on the winding diameter of the roll, the required rotation speed of the winding / rewinding roll is calculated, and the required rotation speed is corrected according to the position of the dancer roll, and then the corrected required rotation is performed by the control means. Since the rotation of the winding / rewinding roll is controlled according to the number, it is possible to improve the followability to changes in the winding diameter of the winding / rewinding roll and to suppress the shake of the dancer roll. The advantage is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a winding device using a dancer roll to which an automatic tension control method for a dancer roll according to the present invention is applied.
FIG. 2 is a conceptual diagram showing a pulse signal n1 output from an encoder 10 and a pulse signal n2 output from an encoder 11.
FIG. 3 is a conceptual diagram showing a change in the rotational speed R of the winding roll 3 with respect to a change in the winding diameter D.
FIG. 4 is a block diagram showing a schematic configuration of a conventional dancer roll type winding / rewinding device.
[Explanation of symbols]
1 Line drive roll 2 Dancer roll 3 Winding roll (winding / rewinding roll)
4 Processed material 6 Position sensor (position detection means)
10 Encoder (first pulse generating means)
11 Encoder (second pulse generating means)
12 Winding diameter calculation part (winding diameter calculation means)
13 Line speed calculation unit (speed calculation means)
14 Divider (Rotation speed calculation means)
15 Comparator 18 Subtractor (Correction means)
19 PWM (control means)
20 F / V converter (control means)

Claims (3)

Automatic tension control of a winding / rewinding device that has a dancer roll between the line drive roll and the winding / rewinding roll and performs the winding / rewinding of the work material while controlling the position of the dancer roll. A device,
A speed calculating means for calculating a feed speed of the processed material by the line drive roll;
A winding diameter calculating means for calculating a winding diameter of the winding / rewinding roll;
Based on the feed speed by the speed calculation means and the winding diameter by the winding diameter calculation means, a rotation speed calculation means for calculating the necessary rotation speed of the winding / rewinding roll;
Position detecting means for detecting the position of the dancer roll;
Correction means for correcting the necessary rotational speed by the rotational speed calculation means based on the position of the dancer roll by the position detection means;
An automatic tension control device comprising: control means for controlling the rotation of the winding / rewinding roll according to the required rotational speed corrected by the correcting means. First pulse generating means for generating a first pulse signal having a period according to the rotational speed of the line drive roll;
A second pulse generating means for generating a second pulse signal having a period according to the rotation speed of the winding / rewinding roll;
The winding diameter calculating means is configured to perform the winding and winding based on the first pulse signal generated by the first pulse generating means and the second pulse signal generated by the second pulse generating means. 2. The automatic tension control device according to claim 1, wherein a winding diameter of the rewinding roll is calculated. Automatic tension control in a winding / rewinding device that has a dancer roll between the line drive roll and the winding / rewinding roll, and performs winding / rewinding of the work material while controlling the position of the dancer roll. A method,
A first step of calculating a feed rate of the work material by the line drive roll;
A second step of calculating a winding diameter of the winding / rewinding roll;
A third step of calculating a necessary rotational speed of the winding / rewinding roll based on the feeding speed and the winding diameter;
A fourth step of correcting the required rotational speed at the position of the dancer roll;
And a fifth step of controlling the rotation of the winding / rewinding roll according to the corrected required rotational speed.

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