Abstract: A drive module for a photoreceptor in an electrophotographic printing machine. The drive module has retractable features that allow the insertion and removal of the xerographic CRU without causing damage to the photoreceptor and other critical subsystems. The unit further has many locating members for other subsystems so that critical tolerances are maintained. A single handle assembly retracts/unlocks and extends/locks the drive module and the associated CRU subsystems into an operative position. The drive module also has electrical and drive connections for the cleaning system, the charging system and transfer/detack.

Abstract: A sensor having a shutter mounted upon a shaft for rotation within a housing in opposition to a light path between an LED and photodetector is described. A potion of the shaft extends outside the housing connected to an elongated arm. A runner secured to the elongated arm, engages a moving photosensitive surface and deviations of the edge position of the photosensitive surface rotate the shutter in relation to the light path between the LED and photodetector for tracking the edge position of the moving photosensitive surface by providing signals representing shutter position.

Abstract: A release agent management system incorporated in an electrophotograpic printing machine having a heat and pressure fuser assembly with stripper fingers to aid in the removal of fused copies from the fuser roll. The fuser assembly includes a heated fuser roll, a pressure roll, a sump containing a quantity of release agent, a metering roll and a donor roll. The metering roll is immersed in a quantity of release agent and is in contact with the donor roll. The donor roll acts as the transport to transfer release agent from the metering roll to the heated fuser roll. The surface of the donor roll is provided with cutout grooved areas corresponding to the location of the stripper fingers on the fuser roll. These grooves result in a lesser amount of release agent being applied to the fuser roll in the area adjacent the stripper fingers.