Image forming apparatus

An image forming apparatus, comprising:

• image forming means for forming an image on an image bearing member;
• first transfer means for transferring the image on said image bearing member to an intermediate transfer body on a first transfer position;
• second transfer means which has a transfer member and transfer output means and transfers the image on said intermediate transfer body to a transferring material on a second transfer position, said transfer means being attachable and detachable to said intermediate transfer body, said transfer output means applying a transfer output to said transfer member;
• said second transfer means performing voltage-current detection on said transfer member when no image is formed and determining the transfer output of the transferring operation based on a detection result of the detecting operation;
• cleaning means which has a cleaning member attachable and detachable to said intermediate transfer body, brings said cleaning member to a surface of said intermediate transfer body, and cleans the surface on a cleaning position, and
• control means for performing control so that a detecting area of the detecting operation does not overlap the position which is in contact with or separated from said cleaning member and is not cleaned by said cleaning means on said intermediate transfer body.

An image forming apparatus, comprising:

• image forming means for forming an image on an image bearing member,
• first transfer means for transferring the image on said image bearing member to an intermediate transfer body on a first transfer position,
• second transfer means which has a transfer member attachable and detachable to said intermediate transfer body and transfers the image on said intermediate transfer body to a transferring material on a second transfer position,
• cleaning means which has a cleaning member attachable and detachable to said intermediate transfer body, brings said cleaning member into contact with a surface of said intermediate transfer body, and cleans the surface on a cleaning position, and
• control means for performing control so that a contact area in a subsequent contacting operation of said transfer member and an image forming area do not overlap the position which makes contact with said cleaning member on said intermediate transfer body and is not cleaned by said cleaning means.