Image-forming device having waste developer material conveying mechanism

An image-forming device, comprising:

• a holding member;
• a photosensitive body held by the holding member;
• a developing unit having a developer material bearing body, the developer material bearing body being configured to bear developer material thereon and supply developer material from the developer material bearing body to a surface of the photosensitive body;
• a developer cartridge that can be mounted in and detached from the developing unit and that has a case and a shutter, the case being formed with a through-hole, through which developer material accommodated inside the case is supplied to the developing unit, the shutter being configured so as to be capable of moving between an open position opening the through-hole and a closed position closing the through-hole;
• and
• a developing unit movement control mechanism that is configured to allow the developing unit to move in a pressing direction for pressing the developer material bearing body against the photosensitive body when the shutter is in the open position and to restrict the movement in the pressing direction when the shutter is in the closed position.