Image forming apparatus, charge controlling apparatus, and image forming method

摘要

The color printer of the invention comprises a conductive brush roller contacting with a photosensitive drum at a position downstream of a transferring apparatus and upstream of a charging apparatus, collecting at least part of residual toner after transferring on the photosensitive drum temporarily, and expelling the collected toner onto the photosensitive drum, a charge electrode facing the brush roller at a position other than the contact position of the photosensitive drum and brush roller, and a power source for applying voltage to the charge electrode. The polarity of the voltage applied from the power source to the charge electrode with respect to the average voltage of the surface of the photosensitive drum after transferring is the same as a charging polarity of the toner at developing.