| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that the responsiveness and the accuracy of the positional control for controlling the position of a down coiler is hardly enhanced, the accuracy of the position of a wrapper roll is hardly enhanced when changing the control from the pressing force control to the positional control, and there is possibility that the resonance vibration due to the disturbance occurs in a pressing force control system. SOLUTION: A position control system 30 for controlling the position of a wrapper roll, and a pressing force control system 40 for controlling the pressing force by the wrapper roll are independently constituted. The damping characteristic is given to the position control system 30 by performing the negative feedback of the cylinder thrust detection signal TH via a constant unit 33 and a subtractor 34, and the roll position when completing the control of the pressing force is supplied to the position control system via a sample hold circuit 37 as the present position of the roll position when completing the control of the pressing force and re-starting the positional control. A band pass filter 45 having the increased gain in a vicinity of its resonance frequency is provided on the pressing force control system 40, and the resonance vibration is prevented by performing the negative feedback in a vicinity of the resonance frequency. COPYRIGHT: (C)2007,JPO&INPIT
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