the surface of the drum 9 a developing unit d1 including a developing roller d2 for supplying a developer to the drum 9 and developing the latent image a cassette e containing copy paper p a feed roller 11 for delivering the copy paper from the cassette e a transport roller r1 for transporting the copy paper delivered by the feed roller 11 a resist roller 12 for intermittently feeding the paper toward the drum 9 at a specified time a transfer charger c1 for charging with corona discharge the rear surface of the paper fed by the resist roller 12 to transfer the developed toner image from the drum 9 onto the front surface of the paper a separating charger c2 for neutralizing by ac corona discharge the charges on the paper bearing the transferred image to separate the paper from the drum 9 a conveyer belt b driven by rollers r2 for further transporting the separated paper a pair of fixing rollers r3 and r4 for passing the paper between to heat fix the toner image a heat source lamp l2 housed in the fixing roller r3 for heating the roller r3 discharge rollers r5 for discharging the paper after fixing a tray t for receiving the discharged paper a cleaning unit f for cleaning the surface of the drum 9 a main motor 18 for.