Patent ID: 6463170
Filing Date: 2002-10-08
Classification: D21F,D21G,G01N

Abstract:
A monitoring system for web breaks in a paper machine, comprising:a number of cameras for imaging various positions of a monitored web; digital image processing equipment for storing image data from a plurality of camera positions; and a selector for choosing a focused picture region from said image data of a selectable individual picture of various camera positions, said digital image processing equipment is adapted to compile image change data by comparing the change between sequential images as far as said focused image region is concerned, and a reference level for said image change data, which represents a normal level of said image change data; comparators for comparing said image change data to said reference level and for setting off an alarm message, in case said image change data has a deviation from said reference level which exceeds a preset threshold value; and an alarm equipment for setting off a break alarm if said alarm message is delivered said image change data comparators of one or more camera positions.