Process cartridge usable with an image forming apparatus and including a shutter

A process cartridge of an image forming apparatus, comprising:

• a developing cartridge including a toner inlet and a shutter to open and close the toner inlet;
• a toner cartridge detachably mountable to the developing cartridge and including a toner supply port to correspond with the toner inlet when the toner cartridge is mounted with the developing cartridge,
• wherein the shutter moves in a direction in which the toner cartridge moves when being connected to the developing cartridge, thereby opening the toner inlet, and the shutter moves in a direction in which the toner cartridge moves when being separated from the developing cartridge, thereby closing the toner inlet;
• and
• a sliding hole formed adjacent to the toner inlet to receive an operation piece projecting from the shutter.

A process cartridge usable with an image forming apparatus, comprising:

• a first cartridge having a first port;
• a second cartridge attachable to the first cartridge and having a second port to correspond with the first port of the first cartridge when attached thereto;
• a port control part to open the first port of the first cartridge when the second cartridge is attached thereto and to close the first port of the first cartridge when the second cartridge is detached therefrom;
• a sliding hole disposed adjacent to the first port on the first cartridge;
• a shutter movable along a surface of the first cartridge between a first position away from the first port and a second position to close the first port;
• and
• an operation piece protecting from the shutter and extending through the first cartridge sliding hole and to contact a driving part of the second cartridge when the second cartridge is attached to the first cartridge.

A process cartridge usable with an image forming apparatus, comprising:

• a first cartridge having a first opening and a shutter to cover the first opening;
• a second cartridge having a second opening near the opening of the first cartridge when coupled to the first cartridge;
• and
• a sliding hole disposed on the first cartridge adjacent to the first opening to receive and to guide therein an operation piece which extends from the shutter,
• wherein the second cartridge biases the shutter to move the shutter operation piece along the sliding hole to uncover the opening when the second cartridge is coupled to the first cartridge and allows the shutter to move the shutter operation piece along the sliding hole to cover the opening when uncoupled therefrom.