Image forming apparatus

An image forming apparatus, comprising:

• a body;
• a photosensitive body having a surface on which an electrostatic latent image is to be formed and developed;
• a developing device detachably received in the body, the developing device being configured to supply developer to the photosensitive body so as to develop the electrostatic latent image on the surface of the photosensitive body;
• an electrical potential sensor unit arranged to measure an electrical potential of a surface of the photosensitive body;
• and
• an anti-interference device adapted to cause the electrical potential sensor unit to move out of a movement path of the developing device along which the developing device moves during installation or detachment of the developing device to thereby prevent an interfering contact between the developing device and the electrical potential sensor unit during movement of the developing device along the movement path.

An image forming apparatus, comprising:

• a body;
• a cover arranged to open and close an access opening in the body;
• a developing device having a photosensitive body, the developing device being receivable into and detachable from the body through the access opening;
• an electrical potential sensor unit configured to measure an electrical potential of a surface of the photosensitive body;
• and
• a link device adapted to couple the cover and the electrical potential sensor unit in such a manner the electrical potential sensor unit moves toward or away from the photosensitive body according to opening/closing movement of the cover.