Image forming apparatus having plurality of toner cartridges aligned in one direction and plurality of detachable photosensitive drums detachable in the one direction

An image forming apparatus comprising:

• a main body casing including:
• a front side wall having a plurality of cartridge ports and a tray port;
• and
• a door for covering the plurality of cartridge ports on the front side wall;
• and
• a partition wall that partitions the main body casing into a cartridge receiving space and a drum receiving space, the partition wall including:
• a plane unit that partitions the cartridge receiving space and the drum receiving space;
• and
• a plurality of curved units;
• a reading scanner unit provided above the main body casing, the reading scanner unit being configured to read image information;
• a plurality of toner cartridges, each one of the plurality of toner cartridges being attachable to and detachable from the main body casing in a first direction through a corresponding one of the plurality of cartridge ports on the front side wall of the main body casing, the plurality of cartridge ports on the front side wall of the main body casing being aligned in a second direction which is perpendicular to the first direction,
• each toner cartridge having a cartridge side supply port and a shutter that is movable between an open position where the cartridge side supply port is open and a closed position where the cartridge side supply port is closed;
• a frame;
• a plurality of drum units, each drum unit including a photosensitive drum and a developing roller, the frame supporting the photosensitive drum and the developing roller,
• the frame having a drum side supply port, which is an opening in a third direction perpendicular to the first direction and the second direction, and
• each drum unit being attachable to and detachable from the main body casing in the second direction, each of the plurality of toner cartridges being spaced apart from each photosensitive drum in the third direction in a state where each photosensitive drum and each of the plurality of toner cartridges are attached to the main body casing;
• a sheet feeding unit being attachable to the main body casing through the tray port on the front side wall of the main body casing in the first direction;
• and
• a sheet discharging unit configured to discharge a sheet in a space between the main body casing and the reading scanner unit,
• wherein the cartridge receiving space is configured to receive each of the plurality of toner cartridges, and the drum receiving space is configured to receive each photosensitive drum,
• wherein each of the curved units supports a corresponding one of each of the plurality of toner cartridges,
• wherein the cartridge receiving space is connectable with an area outside of the main body casing via the cartridge ports,
• wherein the main body casing has an opening positioned at one end portion of the main body casing in the second direction,
• wherein each photosensitive drum is detachable from the main body casing through the opening in the second direction, and
• wherein in a state where the toner cartridge is attached to the main body casing, the shutter is moved to the open position so that the cartridge side supply port is open in the third direction and communicates with the drum side supply port.