The present invention relates roller to control well high accuracy and responsiveness of the nip pressure between the pair.
Pressure device A embodiment, at least one of the position of the first roller and the second roller is displaced, a drive unit to approach or separate the said second roller and said first roller, said drive and controls the parts, and a position control means for feedback controlling at least one of the position of the first roller and the second roller, by controlling the drive unit, acting between said first roller and said second roller a force control means for feedback control of the force, after the contact position from the spaced position and said second roller and said first roller by a feedback control by the position control means, said force by a feedback control by the force control means There equipped to be the target value of the nip pressure, the control method switching means for switching the feedback control target, the.
.FIELD 7