Method for determining the moment that a layer of tacky material present on a cleaning member requires to be rejuvenated, and device for effecting this method.

摘要

A method for determining the moment that a layer (9) of tacky material, which layer (9) is present on a cleaning member (8) and serves the purpose of removing contaminants, such as paper dust and softened tonermaterial, from a fusing surface (1), has to be rejuvenated. The method comprises measuring the light-reflection of the layer (9) of tacky material, comparing the measured light-reflection with a reference value and rejuvenating the layer of tacky material as soon as the measured light-relection differs a predetermined value from the reference value.… Ralates also to a device for effecting said method.