JPS62116453A - Winding and unwinding control device - Google Patents

Abstract

PURPOSE:To perform winding and unwinding smoothly without caussing hunting in a dancer roller, by detecting the rate of change of a referential tension when it changes and changing the gain of a dancer control circuit according to the rate of the change. CONSTITUTION:There is provided a differential arithmetic unit 16 for calculating differential value of a rate of change from a rate circuit 21 for applying a changed rate to a referential tension Tr when tension of a sheet member 1 to be wound and unwound changes. In addition, there is provided a correction circuit 18 comprising a gain circuit 17 for multiplying the differential value thus calculated by a prescribed gain and a multiplying unit for multiplying an output from the gain circuit 17 by an output from a selsyn oscillator 14 and applying the product to a dancer control unit 15. Therefore, the gain of the dancer control circuit is changed as the referential tension Tr changes, whereby it is possible to smoothly cope with the change of tension without hunting the dancer roller 3.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention prevents dungeon hunting during rewinding in a device that winds a sheet material such as paper or film onto a turret winder and then unwinds it. The present invention relates to a winding/rewinding control device provided with means.

C. Technical background of the invention and its problems 3 When winding up a sheet material such as paper or film, constant tension control is performed to maintain the tension of the winding coil constant. As an example of such constant tension control, the system diagram of constant tension control by dancer control using a dancer roll in a 2ITlk turbine winding machine is shown in the second diagram.
The figure shows the third example of the rewinding operation of a two-shaft turret winder.
As shown in FIG.

During winding in a steady state with constant tension control, the turret position shown in Figure 3 is taken, and as the A-axis coil 2 becomes thicker, the shaft 20 is moved in the direction of the arrow to the rewinding position shown in Figure 4. Rotate (this action is called a turret). After completing the turret, cut the material and attach the new core 23 on the B@coil side.
Wind up the sheet material 1. Move this movement from the A axis to the B axis,
By switching from the axis to the A-axis, the winding operation can be performed continuously without stopping the line.

FIG. 2 is a diagram showing a state corresponding to the turret position shown in FIG. 4, which is in the rewinding preparation state. In Figure 2,
The A-axis coil 2 of the turret winding 1119 is rotationally driven by the electric full I machine 6. This electric motor 6 is speed-controlled by the speed 11i+control device 9 according to the speed reference ① set by the speed reference setter 5 when the contact 8 is closed. The dancer roll 3 is connected to a voltage/pressure converter (with adjustment rate limited by a rate circuit 21 according to a tension standard T set by a steady tension standard setter 12).
A load is applied via an E/P converter (hereinafter referred to as an E/P converter) 11. At this time, while a load is applied to the dancer roll 3, a tension equivalent to the dancer roll load is also applied to the sheet material 1 in the opposite direction as a reaction (sheet material tension). In a steady state, the load applied to the dancer roll 3 and the sheet material tension applied to the sheet material 1 are balanced, and the dancer roll 3
The dancer stops at the fixed position.

Now, if the tension applied to the sheet vJ1 changes due to some kind of disturbance, the load balance will be disturbed and the dancer position will change. For example, when the tension of the sheet material 1 weakens, the dancer roll 3 is pulled toward the cart and is shifted below the dancer's normal position. This deviation from the dancer's fixed position is detected by the celsin oscillator 14, and the dancer controller 15 performs proportional-integral control, and a correction is applied to the speed reference (2) via the contact 25. When the dancer roll 3 is shifted downward, the sheet material 1 is pulled by applying correction in the direction of increasing the speed of the A-axis coil 2, and the dancer roll 3 is returned to the dancer position.

By electrically controlling the fixed position of the dancer roll 3 as described above, the load (tension reference T) applied to the dancer roll 3 and the tension of the sheet material 1 are balanced, and the tension of the sheet material 1 is balanced.
Apply a constant tension to.

As shown in FIG. 4, when rewinding to the 8@ side new core 23, the tension reference T is transferred from the steady tension setting device 12 to the collar tension setting device 13 at the contact point 2 so that the rewinding can be carried out smoothly.
2 to switch and detension.

When the tension changes like this, the conventional winding control device detects the load change of the E/P converter 11 and the dancer roll 3 and the dancer roll position change in response to the change in the tension reference T, and controls the dancer control 611. Due to a 15, the response to change the speed of the electric motor 16 is often out of synchrony.As a result, the dancer roll position hunts as shown in Fig. 5, making it difficult to rewind smoothly. There was a problem that the roll could not be rolled in a consistent manner.

This problem occurs not only when rewinding from the A-axis to the B-axis in a two-axis turbine winder, but also when changing the tension during winding, such as when rewinding from BIT4A to the A-axis, or when changing the tension setting. This is generally the same, and can also occur in general winding control devices that perform dancer control. Furthermore, in addition to the above-mentioned case of winding, the same applies to the case of unwinding, where the direction of movement of the sheet material is reversed (if the speed is positive in the case of winding, it becomes negative). phenomenon may occur.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a winding/rewinding control device that can prevent or suppress hunting in the position of a dancer roll when changing the set tension. ·be.

[Summary of the invention]

In order to achieve the above object, the present invention provides differential calculation means for calculating a differential value of the tension reference outputted from the tension reference Q-setting device when the tension changes, and gain circuit means for multiplying the differential value by a predetermined gain. The present invention is characterized in that a multiplier is provided which multiplies the output of the gain circuit means by the dancer roll detection signal and supplies the product signal to the dancer controller.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and in contrast to the conventional dancer control configuration shown in FIG. a differential operator i 16, a gain circuit 17 which multiplies the differential value calculated by this with a predetermined gain, and an output from the gain circuit 17 is multiplied by the output of the sercine oscillator 14 to perform dancer control [i1
The structure is the same as that shown in FIG. 2, except that a gain correction circuit 18 consisting of a multiplier 25 applied to 5 is added.

As explained about the rewinding operation in FIGS. 3 and 4, during the rewinding operation, the setting switching contact 22 is used to switch to the rewinding tension setter 13 side, and the tension reference ■ is given a rate by the rate circuit 21. It is lowered as shown in Fig. 5. At this time, the differential value dT, /dt of the tension reference T is calculated by the differential operator 16, and the gain is applied to this by the gain circuit 17 to obtain the correction mΔT. The change is reduced by multiplying the output of the Sershin oscillator 14. This multiplication result is input to the Dan signal control circuit 15.

Therefore, since the gain of the dancer control circuit is changed in accordance with the change in the tension reference Tr, it is possible to smoothly respond to changes in tension without causing the dancer roll 3 to hunt.

In the above embodiments, an analog circuit system is shown, but at least a part of the control system may be replaced by a stored program computer.

(Effects of the Invention) As explained above, according to the present invention, when the tension reference changes, the rate of change is detected, and the gain of the dancer control circuit is changed according to the rate of change, thereby causing hunting in the dancer roll. Smooth rewinding, winding, and
Rewinding is possible, and winding or unwinding can be performed in a constant winding form without deviation or winding wrinkles. Furthermore, the wasted portion of the sheet material can be discarded when rewinding.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an embodiment of the present invention, Fig. 2 is a system diagram showing an example of a conventional control device, and Figs. 3 and 4 are rewinding operations in a two-shaft turbine winder. FIG. 5 is a time chart showing changes in speed, tension, and dancer position during rewinding. DESCRIPTION OF SYMBOLS 1... Sheet material, 2... A-axis coil, 3... Dancer roll, 4... Auxiliary roll, 5... Speed reference setter, 6... Δ-axis side electric motor, 7...・B-axis side electric motor, 8
... Axis drive contact, 9, 10... Speed control device, 1
DESCRIPTION OF SYMBOLS 1... Electricity/pressure converter, 12... Steady tension setting device, 13... Rewinding tension setting device, 14... Cersin transmitter, 15... Dancer control Il device, 16... Differentiation performance, 17... gain circuit, 18... gain correction circuit, 19... turret winder, 20... axis, 2
1...Rate circuit, 22...Setting switching contact, 23.
...B@New Core, 24...B axis drive contact, 25.
・・l! ) Calculator. Applicant's agent Fi Fujio Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. An electric motor that drives a turret winder that winds a sheet material into a coil shape and unwinds a sheet material wound into a coil shape, and a speed control device that controls the speed of this electric motor. , a speed reference setting device that provides a speed reference to the speed control device, a dancer device that applies tension to the sheet material, and a tension reference setting device that provides a tension reference for the dancer device;
A winding device comprising: a position detecting means for detecting the roll position of the dancer device; and a dancer controller correcting the speed reference from the speed reference setting device in accordance with the roll position detected by the position detecting means. In the rewinding control device, a differential calculation means for calculating a differential value of the tension reference from the tension reference setting device, and a negative correction to the gain of the control system including the dancer controller according to the output from the differential calculation means. A winding/rewinding control device, characterized in that it is provided with means for adding. 2. The winding/rewinding control device according to claim 1, wherein at least a part of the control system is constituted by a stored program type computer.