COLOR IMAGE FORMING DEVICE USING INTERMEDIATE TRANSFER BODY

摘要

PURPOSE: To economically provide a device capable of preventing the re-transfer phenomenon of transferred toner on an intermediate transfer body and capable of making transfer pressure small so as to form a good image. CONSTITUTION: An electrostatic latent image successively formed on an image carrier 1 is developed by the toner T of each color. The developed image is multiply transferred on the belt-like intermediate transfer body 2 whose electrical resistance is 10<8> to 10<13>Ωcm by a primary transfer device. The bias roll (member) 3 for primary transfer has an outermost layer 5 being the layer of electrical resistance higher than the resistance of the transfer body 2, and performs primary transfer by impressing a bias for transferring on a conductive core bar 6 on the inner side than the high-resistance thin layer 5. Electric charge for transfer transferred to the transfer body 2 from the bias roll 3 is interrupted by the layer 5 of a transfer member, so that the electrified amount and the electrifying polarity of the toner on the transfer body 2 on which the toner has been transferred are not largely changed.