Patent ID: 7505716

Claim:
A process cartridge of an image forming apparatus comprising: a development cartridge including, a development cartridge housing with a toner inlet port therein, and a toner inlet port cover movably formed at the development cartridge housing, to open and close the toner inlet port, having a rib at a leading end thereof, and a locking recess at a lateral surface thereof; and a toner cartridge including, a toner cartridge housing, detachably engaged with the development cartridge, having toner provided therein, a toner supply part provided with a toner supply port and a locking protrusion to contact the rib of the toner inlet port cover, and a locker to lock in the locking recess of the toner inlet port cover, the locker positioned such that the locker does not move across the toner inlet port, when the toner cartridge is being moved into engagement with the development cartridge.