Patent ID: 8315538

Claim:
An image forming apparatus comprising: a plurality of image bearing members; a plurality of primary transferring devices for transferring toner images from said image bearing members onto an intermediary transfer belt provided above said plurality of image bearing members; an intermediary transfer unit including said intermediary transfer belt; a secondary transfer portion for transferring the toner image from said intermediary transfer belt onto a recording material; a detecting member for detecting the toner image formed on said intermediary transfer belt; an adjusting device for adjusting a condition under which the image is formed on said image bearing member on the basis of a result of detection of said detecting member; an openable member for opening an opening portion provided in said image forming apparatus; a guiding mechanism for guiding draw of said intermediary transfer unit toward said opening portion when said openable member opens; and a retracting mechanism for retracting said detecting member away from said intermediary transfer unit with movement of said intermediary transfer unit toward said opening portion.