Abstract: An electrophotographic image forming apparatus is provided including a body including an opening and a first coupler, a photoreceptor cartridge including a second coupler connected to the first coupler, a first gear connected to the second coupler, and a mounting portion, and attached to or detached from the body through the opening; and a development cartridge including a second gear connected to the first gear and attached or detached from the mounting portion through the opening while the photoreceptor cartridge is mounted in the body.

Abstract: A developing unit and an image forming apparatus having the same. The developing unit includes a controlling unit to restrict a contact position between the charging roller and a photosensitive body, thereby preventing deformation of the charging roller caused when the developing unit is not used for a long period of time.

Abstract: A developing unit and an image forming apparatus are disclosed. The developing unit includes an image carrier on which an electrostatic latent image is formed, a developing member to supply a developer to the image carrier, and a first cleaning member having a first cleaning blade to remove a non-transferred developer on the image carrier. The first cleaning blade is configured to be reversible between a counter disposition, which is opposite to a rotation direction of the image carrier while the image carrier is in a printing operation, and a trailing disposition, which corresponds to the rotation direction.

Abstract: A developing unit and an image forming apparatus having the same. The developing unit includes a controlling unit to restrict a contact position between the charging roller and a photosensitive body, thereby preventing deformation of the charging roller caused when the developing unit is not used for a long period of time.