Browse Prior Art Database

Original Publication Date: 1994-Oct-31
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal


In xerograpic copying and printing systems, transfer blades are often used to assist in the transfer of the developed image to the surface of a copy sheet. The transfer blade is a device that applies a force against the back or rear surface of a copy sheet passing through the transfer station. Use of the transfer blade is intended to iron-out deformities in the copy sheet, assuring contact between the sheet and the photoreceptor, and thereby improving transfer. Accordingly, it is important for the blade to touch down on the back side of the copy sheet as the sheet and developed image concurrently reach the transfer zone. In a system employing a gripper bar arrangement to move the copy sheet through the system, for example the system disclosed in U.S. Patent No. 5,128,726 to Cassano et al., issued July 7,1992, assigned to Xerox Corporation, the timing of the transfer blade must be such that the transfer blade misses the sheet grippers. Furthermore, the blade must retract slightly before the end of the copy sheet to avoid contact with the photoreceptor belt.