Patent ID: 6911117

Claim:
A method for damping vibration induced by a roll ( 1 ) in a paper machine or in a paper finishing device by means of a dynamic damper which comprises: a weight ( 4 , 4 a , 4 b ) and a spring ( 3 , 3 a , 3 b ), connecting the weight ( 4 , 4 a , 4 b ) to a vibrating system ( 2 ) of the paper machine or paper finishing device, whereby the dynamic damper is tuned by means of a control device ( 9 ) to a tuning frequency that is substantially equal to a multiple of the rotational frequency of the roll ( 1 ) that is closest to the natural frequency of the vibrating system ( 2 ), or to a tuning frequency that substantially corresponds to the problematic excitation frequency of the vibrating system ( 2 ), wherein said weight ( 4 , 4 a , 4 b ) is suspended from said vibrating system by means of said spring ( 3 , 3 a , 3 b ) and in that, the spring constant of the spring ( 3 , 3 b ) of the dynamic damper and/or the mass of the weight ( 4 a , 4 b ) of the dynamic damper is/are changed by means of the control device ( 9 ) in order to tune the natural frequency of the dynamic damper so as to be said tuning frequency.