A developing cartridge is configured to be detachably mounted on an imaging device including a detecting device. The developing cartridge includes a housing; a rotating member rotatably provided in the housing; a driving force receiving member configured to receive a driving force from the imaging device to drive the rotating member to rotate; and a detected device configured to be in electrical contact with the detecting device when the developing cartridge is mounted in the imaging device. When the rotating member is driven by the driving force receiving member to rotate, the detected device is switched between an electrical disconnection state and an electrical connection state. An imaging device having the developing cartridge is also provided.

A developer cartridge includes: a first rotary body having at least one detected part; and a second rotary body. The first rotary body is configured to rotate between a first position, in which a transmission part is disposed opposite the second rotary body, and a second position, in which a non-transmission part is disposed opposite the second rotary body. The first rotary body includes a contacted part. A photosensitive body cartridge includes a moving member. When the moving member is in a third position, the moving member contacts the contacted part of the first rotary body disposed in the second position, causing the first rotary body to rotate to the first position. Thereafter, in association with rotation of the first rotary body, the moving member moves to a fourth position, in which the moving member is unable to contact the contacted part.

Disclosed is a developing cartridge configured to be removably mounted in a main assembly of an imaging apparatus. In some embodiments disclosed, the developing cartridge includes: a cartridge body; a drive force receiving unit including a coupling member, disposed at a first end of the developing cartridge, configured to receive a drive force from the imaging apparatus; a driving member, disposed at the first end of the developing cartridge, configured to receive the drive force and move; a transmission member, receiving a force from the driving member to cause at least a portion of the transmission member to move along a longitudinal direction of the cartridge body; and a detected member provided at a second end of the developing cartridge, configured to be driven by the transmission member.

An image forming apparatus on which an initial state cartridge, which is a cartridge with a seal member attached, is installable includes a removal unit configured to perform an operation of removing one or more seal members of one or more initial state cartridges installed, and a notification unit configured to, in a case where the removal unit fails to remove the one or more seal members, make a notification of information that at least one of the installed initial state cartridges is to be uninstalled from the image forming apparatus.