An image forming apparatus equipped with a monochrome mode and color mode, in which the transfer drum is made to rotate without any paper wrapped around it to clean the transfer drum each time a series of copy operations is completed. By controlling the cleaning period through increasing or decreasing...http://www.google.fr/patents/US5845174?utm_source=gb-gplus-shareBrevet US5845174 - Image forming apparatus equipped with cleaning device
Image forming apparatus equipped with cleaning device
