Abstract: Liquid toner conditioning apparatus for use in an electrophotographic color printer and including a stabilizing roller positioned adjacent to the surface of a photoconductive drum and operative for transforming discrete color toner particles on the surface of the drum into a stabilized unitary polymeric film structure which may be directly transferred onto an adjacent print medium. Advantageously, the stabilizing roller will include an inner core member which may be heated as well as connected to a source of either AC bias or DC bias or both. This stabilizing and toner conditioning roller further includes a soft elastomeric roller cover positioned around the periphery of the inner core member and has a smooth outer surface which makes direct contact with the developed toner layers on the surface of the adjacent photoconductive drum.

Abstract: An electrostatically assisted transfer roller is rotatably mounted to be driven directly against one surface of an adjacent print media and against an adjacent surface of a photoconductive drum at the other opposite surface of the print media. This transfer roller is operative to transfer transparent developed liquid color toners from the surface of the photoconductive drum and onto the print medium using a combination of mechanical forces, electrostatic forces, and thermal energy. The transfer roller includes a metal inner sleeve member within which a heat source is suitably mounted, and an outer non-metallic sleeve member is positioned around the inner sleeve member and is preferably a conductive silicone or conductive polyurethane material. A thin outer overcoat layer is disposed on the outer surface of the outer sleeve member and is adapted to be driven directly against an adjacent surface of the print medium.

Abstract: A corona discharge device for electrophotographic printing is provided in which erasing and primary charging functions are performed by a single device. A screened charging arrangement is used for ion steering, while simultaneous illumination by light produces charge carriers in the photoconducting layer of the drum. In one embodiment, a photochemically etched stainless steel screen is used.