Image forming apparatus

An image forming apparatus comprising:

• a removably mountable corona discharging device having a corona discharging electrode and cleaning means for cleaning said corona discharging electrode;
• guide means for guiding said corona discharging device when said corona discharging device is removably mounted in an operative position;
• and
• stopper means adapted to be engaged with said cleaning means and to move said cleaning means relative to said corona discharging electrode in the direction opposite to the direction of movement of said corona discharging device when said corona discharging device is mounted in said operative position and when said cleaning means is not positioned at a predetermined position in said corona discharging device, thereby to move said cleaning means to said predetermined position, said stopper means being disposed inside of a containing portion for containing said corona discharging device therein;
• wherein said cleaning means is contained in said containing portion when said corona discharging device is mounted at said operative position.