Abstract: An improved corona generating device for an electrostatic reproduction machine having a photoreceptor has a discharge electrode, a conductive shield partially surrounding the electrode, and a cleaning member in contact with and mounted for movement along both the electrode and shield. The improvement lies (1) in the mechanism for moving the cleaning member along the device, this mechanism including a dielectric member located between the electrode and shield so as to increase the corona to the photoreceptor, and (2) in the cleaning member, this member including material impregnated with an abrasive.

Abstract: Improved stripping of a transfer member (having a developed image thereon) from a photoconductive surface of an electrostatic reproduction machine is effected by charging the lead edge of the member with a first charge, and then charging the body of the member having the developed image thereon with a second charge which is different than the first charge. The second charge has a magnitude and polarity which prevents retransfer of the developed image to the photoconductive surface.

Abstract: A corona generating device having a corona wire and a shield partially surrounding the wire has an improved built-in cleaning mechanism. The cleaning mechanism includes a cleaning member slidably mounted within the shield, which member is driven back and forth along the device by a belt connected thereto. The belt is driven by a pulley rotatably mounted on the device, the pulley having gear teeth formed therein which are adapted to mesh with a drive gear. By using conventional quick-disconnect electrical connectors to connect the corona wire to a source of voltage, and a suitable supporting member to both support the device and position the pulley so that it meshes with the drive gear, the device can be easily removed from an electrostatic reproduction machine for routine maintenance, and easily inserted back into the machine.

Abstract: Apparatus is provided for heating an electrically biased transfer roll in an electrostatic reproduction machine so as to improve the transfer of a developed electrostatic image from a photoreceptor to a transfer member during operation of the machine. The roll is heated to maintain the resistivity thereof within a range which will effect optimum transfer, and to alleviate the detrimental effects of ambient temperature changes on the resistivity.