to sheet 18 and cleaning brush 15 for removing excess toner from the drum selenium drum 11 is uniformly charged with positive or negative charges by charger 16 when a light beam modulated with image data produced by electrostatic latent image forming unit 12 is incident upon charged selenium drum 11 changes in charge are produced on areas of the selenium drum that directly receive light beams in such a way as to locally decrease the amount of charge in such areas in other words an electric potential difference exists between an area of the selenium drum upon which the light beam is incident and the remaining area of the selenium drum thus forming an electrostatic image subsequently developing unit 13 feeds toner which has positive or negative charge identical to the polarity of charge on the selenium drum together with a carrier onto the surface of selenium drum 11 so that the latent image on the drum is developed transferring charger 14 charges the ppc sheet paper 18 with charge having a polarity opposite to the polarity of charge on the toner thus causing toner carried by selenium drum 11 to be transferred to sheet 18 toner transferred to ppc sheet 18 is then fixed by a fixing unit 19 residual toner on selenium drum 11 is removed therefrom by means of cleaning brush 15 charger 16 for the photosensitive body charges the selenium drum 11 so that the surface of drum 11 is uniformly charged to an initial positive or negative polarity in the electrophotographic apparatus according to the present invention ppc sheet 18 is charged by voltage pulses applied thereto by means of transferring charger 14 the frequency of these voltage pulses varies in accordance.