The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2005
Filed:
Apr. 22, 1998
Jouko Karhunen, Jyväskylä, FI;
Arto Puranen, Jyväskylä, FI;
Jorma Köliö, Jyväskylä, FI;
Esa Lehtovirta, Jyväskylä, FI;
Erkki Hietamäki, Laukaa, FI;
Jouko Karhunen, Jyväskylä, FI;
Arto Puranen, Jyväskylä, FI;
Jorma Köliö, Jyväskylä, FI;
Esa Lehtovirta, Jyväskylä, FI;
Erkki Hietamäki, Laukaa, FI;
Metso Paper, Inc., Helsinki, FI;
Abstract
A method and apparatus for damping vibration in a paper machine. The apparatus having a dynamic damper which includes a weight suspended by a spring. The spring constant of the spring is changed by means of a control device in order to tune the natural frequency of the dynamic damper. The dynamic damper is tuned to a frequency that is substantially equal to a multiple of the rotational frequency of the roll in the paper machine that is being damped.