Monitoring apparatus

Abstract

There is provided a monitoring apparatus for preventing paper breakage. For this monitoring apparatus, a light source is disposed on the upper side of a wet paper and a light emitting face thereof faces downward. An operation-side camera a and a drive-side camera b are disposed on the side opposite to the light source with respect to the wet paper and a lens face thereof faces upward. Light a of the light source passes through the wet paper after being reflected from a mirror and is caught by the cameras a and b. Thus, the cameras a and b photograph a silhouette (image) of the light a of the light source which has passed through the wet paper This image is sent to an image processing unit where the image is processed. The coordinates of a boundary line such that the wet paper separates from a center roll is detected from the images photographed from two directions. This coordinate value is sent to a computer The computer converts the value into a movement amount in each sampling cycle to determine the change amount and frequency of a separation point and the whole shape of separation lines a and b. Thereby, a machine trouble resulting in paper breakage can be predicted.