Patent ID: 8417130

Claim:
An image forming device comprising: a main body; a support unit that is disposed in the main body and that is configured to be pulled out from the main body in a removing direction, the support unit supporting a photosensitive member; a driving unit provided in the main body; a developer cartridge detachably mountable in the support unit and having a developer member and a driving member, wherein the driving member is configured to be driven by the driving unit at a prescribed amount when the developer cartridge is mounted in the support unit; a moving member configured to move when the driving member is driven by the driving unit; a transmitting member provided to the support unit and rotatable about a rotational axis which extends perpendicular to both the removing direction and a longitudinal direction of the photosensitive member, wherein when the moving member contacts the transmitting member, the transmitting member configured to rotate to let the moving member pass over the transmitting member; a detection member that is provided in the main body and that configured to detect a rotation of the transmitting member; and an information determining unit configured to determine an information of the developer cartridge based on detection results of the detection member.