Method and apparatus for damping contact oscillations of rotating rolls

In a paper machine, a method for damping oscillations of a plurality of rotating rolls, each of the rolls having two opposite ends, said method comprising the steps of:

• holding each of the roll ends in a respective one of a plurality of bearings such that a first roll having a first axis of rotation and a second roll having a second axis of rotation define a nip therebetween;
• providing means for moving at least one of said first roll and said second roll in a substantially linear path in a direction substantially perpendicular to a respective said first axis of rotation and said second axis of rotation;
• providing means for pivoting at least one of said first roll and said second roll in directions substantially toward and away from said nip;
• and
• actively damping the rotating rolls by exerting a phase-shifted counteroscillation on at least one of said bearings using at least one of said moving means and said pivoting means.