When {HEAD ~ a developer supply cartridge} is set at a predetermined position for discharging {TAIL ~ a developer} into a developing device on a cartridge holding portion of the developing device, the developer supply cartridge is locked by a locking member so as to be detached from the predetermined position 
When { HEAD ~ a developer supply cartridge } is set at a predetermined position for discharging { TAIL ~ a developer } into a developing device on a cartridge holding portion of the developing device , the developer supply cartridge is locked by a locking member so as to be detached from the predetermined position
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH