Image forming apparatus having a plurality of developing means around an image carrier

摘要

An image forming apparatus of the present invention includes two developing units each including two developing rollers facing a particular photoconductive drum and rotatable about respective axis parallel to the axis of the drum. Each developing unit is supported by a respective image forming unit and angularly movable about an axis substantially parallel to the axis of the drum. When each developing unit is angularly moved by a preselected angle, a gap for development is established between one of the developing rollers and the associated drum.