Electrophotographic duplicator of the transfer type

Claim 1

An electrophotographic duplicator of the transfer type comprising: means for projecting an image of an original document at an exposure station and including a projection lens; a slit-shaped exposure aperture provided on the image plane of said projection lens; a photosensitive surface of a photosensitive material formed as a flexible endless belt; a number of rollers extending said endless belt along said exposure aperture thereby forming a carrier path for said endless belt and a driving device for driving said endless belt in one direction along said carrier path; a first DC corona discharge device adjacent said carrier path for uniformly charging the photosensitive surface and means for supplying a transparent dielectric film in superposing relationship with said photosensitive surface; a second AC corona discharge device adjacent said transparent dielectric film superposed upon said photosensitive surface for forming an electrostatic latent image thereon corresponding to the electrostatic latent image on said photosensitive surface and formed selectively by positive charge or negative charge on the transparent dielectric film; an illuminating device irradiating the whole of the photosensitive surface through the transparent dielectric film upon which said photosensitive surface is superposed thereby stabilizing the electrostatic latent image on said transparent dielectric film; a developing device for developing the electrostatic latent image formed on said transparent dielectric film; a device for supplying transfer paper to the surface of said developed transparent dielectric film; a transferring device for superposing said transfer paper upon said transparent dielectric film a third corona discharge device for charging siid transfer paper with a charge of opposite polarity as the polarity of said toner and transferring an image corresponding to the original image; a trAnsfer paper carrier path separating the transfer paper passed through said transferring device from the transparent dielectric film path and a transparent dielectric film carrier path separating the transparent dielectric film from the photosensitive surface; and a heat fixing device mounted adjacent said transfer paper carrier path.