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Abstract

Electrophotographic printing apparatus is described, particularly useful for printing a plurality of copies from a single latent electrostatic image, in which the toner transfer system includes a multi-layer transfer photoreceptor having an outer dielectric layer, an inner electrically-conductive layer, and an intermediate photoconductive layer forming an interface with the outer dielectric layer. A charging system charges the outer surface of the outer dielectric layer of the transfer photoreceptor with charges of one polarity to facilitate the transfer of the toner image from the recording photoreceptor to the record member, and produces in the interface, between the photoconductive layer and the outer dielectric layer, charges of the opposite polarity to maintain the charges of said one polarity on the outer surface of the transfer photoreceptor. The transfer photoreceptor may also serve to transport the record member and to separate the record member from the recording photoreceptor. In the described apparatus, the recording photoreceptor is also of a multi-layer construction including an outer dielectric layer, an inner electrically-conductive layer, and an intermediate photoconductive layer forming an interface with the outer dielectric layer. The imaging device produces a latent electrostatic image of one polarity on the outer surface of the outer dielectric layer of the recording photoreceptor; and a charging system produces a charge pattern of the opposite polarity in the interface of the recording photoreceptor to maintain the latent electrostatic image on the outer dielectric layer of the recording photoreceptor during the printing of a plurality of copies.

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First Claim