Interface structure for toner refill cartridge and toner refill portion

A toner refilling interface structure including:

• a toner cartridge including:
• a body including a first toner discharge portion eccentrically located with respect to a first rotation axis and to discharge toner, and to accommodate toner;
• and
• a discharge shutter including a second toner discharge portion and to rotate relative to the body about the first rotation axis to a discharge position at which the first and second toner discharge portions are aligned with respect to each other and a closed position at which the first and second discharge portions are not aligned with respect to each other;
• an installation portion at which the toner cartridge is rotatable about a first rotation axis;
• a locking member provided in the toner cartridge and to lock the discharge shutter at the closed position so the body and the discharge shutter are rotated together during first rotation of the toner cartridge from an installation position to a first angular position;
• a first toner inlet portion provided in the installation portion and to receive toner from the toner cartridge;
• and
• an inlet shutter including a second toner inlet portion aligned with the second toner discharge portion and provided in the installation portion so the inlet shutter is rotated about the first rotation axis to an inflow position from a blocked position by the first rotation, the blocked position being a position at which the first and second toner inlet portions are not aligned with respect to each other and the first toner inlet portion is blocked, and the inflow position being a position at which the first and second toner inlet portions are aligned with respect to each other and the first toner inlet portion is open.