Browse Prior Art Database

Original Publication Date: 1980-Apr-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


One way of cleaning a reusable electrostatographic drum is with the use of a cleaning blade which is maintained in pressure contact with the drum. When the machine is turned off and if the blade remains in contact against the drum for prolonged periods of time, cold flow of the drum surface may be witnessed causing a linear depression on the drum surface. This depression gets filled with toner which cannot be cleaned and eventually causes a line to appear on the output copy. To prevent cold flow, the blade is retracted away from contact with the drum during idle periods. A disadvantage with a retraction system, however, is that when the blade re-engages the drum, it falls back into a pile of toner left at the blade-drum interface on the previous retraction cycle. This allows toner to get on the backside of the blade causing contamination and cleaning failures.