| 摘要 |
A developing cartridge (34) removably set in a laser printer (1) includes a drive gear (70) that inputs a drive force thereto, a detection gear (72) that, when the unused cartridge is set in a laser printer, irreversibly moves from an unused position (i.e. a position indicating that the cartridge has not been used before) where the detection gear (72) does not engage with the drive gear (70), to an used position (i.e. a position indicating that the cartidge has been used) where the detection gear (72) does not engage with the drive gear (70), through a drive force transmitting position where the detection gear (72) engages with the drive gear (70), and a contact member (76) formed on the detection gear (72). Provided in a main frame (2) of the laser printer (1) is an actuator (113) that moves the detection gear (72) from the unused position to the drive force transmitting position as the contact member (76) contacts the actuator (113) when the developing cartridge (34) is set in the main frame (2) of the laser printer (1). <IMAGE> |
