Electrophotographic copying apparatus

Claim 1

An electrophotographic copying apparatus comprising: a photoreceptor having a photoconductive outer layer which photoreceptor is rotatably disposed, a corona charger for preliminarily charging the photoconductive outer layer of said photoreceptor, an optical scanning means including illuminating means for an original to be copied, an optical system for projecting a light image from said original onto said preliminarily charged photoconductive layer and a driving means to drive at least the illuminating means and the optical system in a manner relatively to scan on the original, thereby to produce an electrostatic latent image on said photoconductive layer, a developing means for developing the latent image into a visible toner image by contact of toner on said conductive layer, a transferring means for transferring said toner image onto a transfer material sheet which is fed by a sheet feeding device, a cleaning means for removing residual toner after the transferring, a fixing means disposed in the path of the transfer material and including a fixing device for fixing the transferred visible toner image on said transfer material, a transfer material advancing means for advancing said transfer material from a feeder onto the outer surface of said photoreceptor and through said fixing means to an outlet, and an apparatus housing for, in operatively incorporated relation, containing the photoreceptor, the corona charger, the optical scanning means, the developing means, the transferring means, the cleaning means, the fixing means and the transfer material advancing means, wherein the improvement is that: the apparatus housing comprises, on one side part thereof, a first motor for driving and coupled to the photoreceptor, a second motor for driving and coupled to the optical scanning means, each of said first motor and said second motor having a rotation speed detecting means, rotation speed of said first motor being predetermined constant, and rotation speed of said second motor during forward direction scanning for projecting image of said original onto the photoreceptor is selected to have a predetermined ratio to said predetermined constant speed by means of output signals of said rotation speed detecting means.