Image forming apparatus

An image forming apparatus comprising:

• an image bearing member;
• a charging unit configured to electrically charge said image bearing member;
• a developing unit configured to deposit a developer on a surface of the charged image bearing member;
• a transfer unit configured to transfer the developer from said image bearing member onto a recording material;
• a collecting container configured to collect a residual developer remaining on the surface of said image bearing member without being transferred onto the recording material;
• a developer feeding unit configured to feed, from said collecting container, the residual developer collected in said collecting container;
• a driving unit configured to drive said developer feeding unit and at least one of said image bearing member, said developing unit and said transfer unit;
• and
• a control unit configured to change a driving speed of said driving unit depending on a storing amount of the residual developer in said collecting container in a period from an end of formation of an image on a first recording material to a start of formation of the image on a second recording material subsequent to the first recording material.