Image Forming Apparatus Provided with Contacting-Separating Member Capable of Moving Developing Roller Relative to Photosensitive Drum

An image forming apparatus comprising:

• a casing having an opening;
• a photosensitive drum having an axis extending in an axial direction, the axial direction defining a first side and a second side opposite to the first side;
• a developing unit configured to be mounted in and withdrawn from the casing through the opening in the axial direction, the developing unit including a developing roller;
• a cover disposed on the first side of the axial direction and configured to move between an open position for exposing the opening and a closed position for covering the opening;
• a first contacting-separating member provided at the cover and configured to move relative to the casing for moving, in a state where the cover is at the closed position, the developing roller between an adjacent position adjacent to or in contact with the photosensitive drum and a separated position spaced apart from the photosensitive drum, the first contacting-separating member being configured to move between a first position to place the developing roller at the adjacent position and a second position to place the developing roller at the separated position, the first contacting-separating member including a first operating portion configured to guide the developing roller so as to move the developing roller from the separated position to the adjacent position when the first contacting-separating member moves from the second position to the first position;
• and
• a first urging member configured to urge the first contacting-separating member from the first position toward the second position, the first contacting-separating member being placed at the second position when the cover is at the open position.