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IP.com Disclosure Number: IPCOM000024406D
Original Publication Date: 1980-Aug-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


In the development system of an electrophotographic printing machine, it is frequently, highly desirable to maintain the spacing of the developer roller 10 relative to the surf ace of photoconductive drum 12 substantially constant. Variations in spacing are due to run-out of drum 12. The developer roller 10 includes a substantially stationary tubular member 14 with a magnetic member 16 rotating interiorly thereof. In addition to maintaining the spacing substantially constant, it is also desirable to be capable of adjusting the spacing between photoconductive drum 12 and tubular member 14. In order to achieve both of the foregoing, an eccentric cam 18 is mounted on tubular member 14 with the exterior surface thereof in engagement with drum 12. As drum 12 rotates, variations in the diameter thereof cause cam 18 to move tubular member 14 so as to maintain the drum-to-roll spacing substantially constant. Adjustment of the spacing may be readily achieved by rotating cam 18 relative to tubular member 14 in the area wherein cam 18 engages drum 12. In this way, the size of the drum-to-roll spacing may be adjusted and maintained substantially constant during operation.