Image forming apparatus

An image forming apparatus, comprising:

• a rotatable photosensitive body;
• an exposure device configured to expose the photosensitive body to form an electrostatic latent image on the photosensitive body;
• a developing device including a developing container configured to house a developer containing toner and carriers, and a developer bearing member configured to bear and convey the developer to a development position where the electrostatic latent image formed on the photosensitive body by the exposure device is developed;
• a cleaning member provided in contact with the photosensitive body and configured to clean the photosensitive body;
• a driving unit configured to rotate and drive the photosensitive body in a first rotation direction during development operation in which the developing device develops the electrostatic latent image formed on the photosensitive body;
• a control unit configured to perform a mode for controlling the driving unit to perform a set of rotating and driving the photosensitive body in a second rotation direction opposite to the first rotation direction and then rotating and driving the photosensitive body in the first rotation direction a plurality of times during non-development operation in which the development operation is not performed;
• a sheet provided in contact with the photosensitive body at a position on a downstream of a position where the cleaning member is in contact with the photosensitive body and on an upstream of the development position in the first rotation direction;
• and
• a collection portion provided to face the photosensitive body in a non-contact manner in a region below a contact position where the sheet is in contact with the photosensitive body in a gravity direction and between the contact position and an arrival position on most downstream of the contact position in the second rotation direction when the photosensitive body is rotated and driven in the second rotation direction with the contact position as a starting point in the mode in a horizontal direction.