A removal nip having a predetermined width is formed by a sweep roller pressurizing
mechanism, which adjusts the length of a tension spring by rotating an adjustment
screw, and adjusting the size of an energizing force of a sweep roller with respect
to a photosensitive drum. A pressurizing mechanism similar to the sweep roller
pressurizing mechanism is also provided in a developing roller, to adjust the energizing
force of the developing roller, to thereby form a developing nip having a predetermined width.