Patent ID: 8831453

Claim:
An image forming apparatus comprising: an image bearing member that bears a toner image; an image forming unit that forms a toner image on the image bearing member; an intermediate transfer unit that is movable; a primary transfer member that primarily transfers the toner image to the intermediate transfer unit; a cleaning member that cleans toner remaining on the intermediate transfer unit, the cleaning member being movable between a contact position in which the cleaning member contacts the intermediate transfer unit and a non-contact position in which the cleaning member does not contact the intermediate transfer unit; a voltage application unit that applies a voltage to the primary transfer member and the cleaning member; a control unit; and a current detection unit that detects a current flowing through the voltage application unit, wherein the control unit moves the cleaning member to the non-contact position, determines a transfer voltage based on a current value detected by the current detection unit when a predetermined voltage is applied from the voltage application unit to the primary transfer member before image formation and in a condition where the cleaning member is at the non-contact position, and wherein the control unit applies the transfer voltage to the primary transfer member during the image formation.