Patent ID: 7885574

Claim:
A developer unit that can be installed in and removed from an image forming device, the image forming device including an image carrier, the developer unit comprising: a case that houses developer; a developer carrier that holds the developer thereon; a first engaging part that protrudes beyond the case in a first direction parallel to an axial direction of the developer carrier, the first engaging part being configured to receive a pressing force from a press mechanism associated with the image forming device, such that the developer carrier is configured to be pressed against the image carrier by the pressing force; and a second engaging part that protrudes beyond the case in a second direction parallel to the axial direction, and is spaced from the first engaging part, the second engaging part being configured to receive a separation force from a separation mechanism associated with the image forming device, such that the developer carrier is configured to be separated from the image carrier by the separation force, wherein at least one of the first engaging part and the second engaging part is movable with respect to the case.