TONER CARTRIDGE, TONER SUPPLYING MECHANISM AND SHUTTER

The present invention relates to a developing cartridge to which a toner cartridge is detachably attached, the developing cartridge comprising: a developing roller configured to bear toner and to be rotatable about a rotational axis; a frame that has a toner accommodating portion configured to accommodate toner, the frame being provided with an opening through which the toner is supplied from the toner cartridge to the toner accommodating portion, and the frame including a guide portion configured to guide the toner cartridge so that the toner cartridge is attached to the developing cartridge; a shutter configured to move, with respect to the frame, between an open position in which the shutter opens the opening of the frame and a closed position in which the shutter closes the opening of the frame; a first arm extending in a moving direction of the shutter, the first arm being movable between a first regulating position in which the first arm regulates an opening movement of the shutter from the closed position to the open position and a first allowing position in which the first arm allows the opening movement of the shutter; and a second arm extending in the moving direction of the shutter, the second arm being movable between a second regulating position in which the second arm regulates the opening movement of the shutter and a second allowing position in which the second arm allows the opening movement of the shutter, the second arm being arranged opposite to the first arm across the opening of the frame in a direction of the rotational axis, wherein the guide portion of the frame is configured to guide the toner cartridge to have first and second postures with respect to the developing cartridge, the first posture being a posture to which the toner cartridge is transitioned by being moved in a direction orthogonal to the rotational axis, the second posture being a posture to which the toner cartridge is transitioned from the first posture by being rotated about a second rotational axis extending in the direction of the rotational axis, and wherein the first arm is configured to be moved from the first regulating position to the first allowing position and the second arm is configured to be moved from the second regulating position to the second allowing position in response to a movement of the toner cartridge for a transition to the first posture.