Patent ID: 8463154

Claim:
An image forming apparatus, comprising: an image bearing member that bears a toner image; an intermediate transfer member which is rotatable; a primary transfer member that transfers the toner image from the image bearing member onto the intermediate transfer member in a primary transfer part; a secondary transfer member that transfers the toner image from the intermediate transfer member onto a transfer material in a secondary transfer part; a toner charging member that is provided downstream of the secondary transfer part and upstream of the primary transfer part in a moving direction of the intermediate transfer member, and charges residual toner remaining on the intermediate transfer member; and a common power source that applies a voltage to the primary transfer member and/or the toner charging member, wherein the image forming apparatus is capable of performing a belt cleaning mode in which the residual toner is charged in an opposite polarity opposite to a normal polarity of toner by the toner charging member, and then the charged residual toner is transferred from the intermediate transfer member to the image bearing member by the primary transfer member, and a toner charging member cleaning mode in which the residual toner adhering to the toner charging member is transferred from the toner charging member to the intermediate transfer member, and after then residual toner transferred from the toner charging member to the intermediate transfer member is transferred from the intermediate transfer member to the image bearing member by the primary transfer member, wherein the common power source applies one of voltages of a first polarity and a second polarity opposite to the first polarity, into the primary transfer member and the toner charging member simultaneously; and wherein in a case of performing the toner charging member cleaning mode, the common power source applies the voltage of the first polarity to the primary transfer member and the toner charging member at a timing at which the residual toner, which is transferred from the toner charging member to the intermediate transfer member when the voltage of the first polarity is applied to the toner charging member, reaches the primary transfer part.