Image forming apparatus including endless belt disposed above photosensitive drum

摘要

An image forming apparatus includes a frame, a photosensitive drum, an endless belt disposed above the photosensitive drum, and a pressing member. The photosensitive drum includes a drum body and a flange portion that is provided on one end portion of the drum body. The flange portion has a contacted portion and a pressed portion. The pressing member presses the pressed portion upward to permit the photosensitive drum to be in contact with the endless belt. The frame has a positioning portion disposed above the pressing member and above the photosensitive drum. The positioning portion is configured to be in contact with the contacted portion and to position the photosensitive drum when the pressing member presses the pressed portion. The pressed portion is disposed farther from the drum body in an axial direction of the photosensitive drum than the contacted portion.

主权项

1. An image forming apparatus comprising:
a frame; a retaining unit configured to move between an internal position within the frame and an external position outside of the frame; a process cartridge configured to be attached to and detached from the retaining unit, the process cartridge including a photosensitive drum, the photosensitive drum extending in an axial direction; a belt disposed above the retaining unit when the retaining unit is disposed at the internal position; and a first pressing member configured to press, when the retaining unit retaining the process cartridge is disposed at the internal position, a first pressed portion of the process cartridge upward to permit the photosensitive drum to be in contact with the belt, wherein the frame has a first positioning portion disposed above the first pressing member and above the photosensitive drum when the retaining unit retaining the process cartridge is disposed at the internal position, the first positioning portion configured to be in contact with a first contacted portion of the process cartridge when the first pressing member presses the first pressed portion, and wherein the retaining unit includes a side plate having a receiving portion in which the process cartridge is received so as to move upward and downward relative to the receiving portion, a position of the side plate in the axial direction being disposed farther from the center of the photosensitive drum in the axial direction than a position of the first positioning portion in the axial direction.