Patent ID: 9134656
Filing Date: 2015-09-15
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image carrier to carry a toner image; a transfer member to form a transfer nip between the image carrier and the transfer member; a power supply to output a superimposed bias having a direct-current component superimposed with an alternating-current component and a direct-current bias including a direct-current component; and a control device that controls the power supply to output the superimposed bias or the direct-current bias including a transfer polarity to transfer the toner image on the image carrier onto a recording medium in the transfer nip, wherein the control device controls the power supply to alternately output a first bias corresponding to a direct-current component including the same polarity as the transfer polarity and a second bias corresponding to a direct-current component including a polarity opposite to the transfer polarity to clean the transfer member when image formation is not taking place, wherein the first bias is output with a target output value set in two stages including a first preceding stage and a second following stage including an absolute value lower than an absolute value of the first stage, and wherein an output time of the second bias is longer than an output time of the first bias.