Patent number: 5403447
Abstract: System in a press section of a paper machine for monitoring and control of the running of the press felts (10,20,30). The press felts (10,20,30) are guided by means of rolls (13,14,15; 23,24,25; 33,34, 35), whose axial directions are altered by means of an actuator (18a, 18b) so as to control the running of the press felts (10,20,30). The system includes detector devices (16,26,36), by whose means the alignment stripe (K) on the felt or felts (10,20,30) is detected, as well as oscillation detectors (17,27,37), by whose means oscillations of the press rolls (10, 20,30) are detected. Into the computer part (50) included in the system, the monitoring signals (a,b) are fed from said detectors (16,26,36, 17,27,37). The computer (50) analyzes the detector data in order to detect any felt-induced oscillations.
Type:
Grant
Filed:
May 21, 1992
Date of Patent:
April 4, 1995
Assignee:
Valmet Paper Machinery Inc.
Inventors:
Jarmo Jarvinen, Kyosti Kuukkanen, Pekka Liukkonen, Jari Tiainen