Process unit

An image forming apparatus configured to form an image on a sheet, comprising:

• a casing;
• a sheet cassette arranged at a lower side in the casing, the sheet cassette configured to accommodate the sheet;
• a process cartridge detachably attached to a central part of the casing, the process cartridge configured to form a toner image on the sheet, the process cartridge comprising:
• a drum unit comprising a photoconductive drum rotatably supported at a rear end part of the drum unit, the photoconductive drum being rotatable about an axis extending in an axial direction, the photoconductive drum having a circumferential surface;
• a cleaner unit arranged at an upper position with respect to the photoconductive drum, the cleaner unit comprising:
• a blade configured to remove waste toner from the circumferential surface of the photoconductive drum;
• and
• a screw configured to transfer waste toner removed from the circumferential surface of the photoconductive drum by the blade in the axial direction of the photoconductive drum;
• a charging roller arranged on an upper front position with respect to the photoconductive drum, the charging roller configured to charge the circumferential surface of the photoconductive drum;
• a developing unit comprising:
• a toner reservoir configured to store toner;
• and
• a developing roller configured to supply toner to the circumferential surface of the photoconductive drum;
• a waste toner collecting box configured to collect waste toner;
• and
• a scanner unit configured to emit a laser beam toward the circumferential surface of the photoconductive drum,
• wherein the developing unit is movably connected to the waste toner collecting box at a position under a space through which the laser beam emitted from the scanner unit toward the circumferential surface of the photoconductive drum passes.