Patent attributes
An image forming apparatus including an outer frame, a photosensitive unit, a drum drive gear, a first positioning portion, and a second positioning portion. The photosensitive unit includes a plurality of photosensitive drums, a first supporting shaft, a second supporting shaft, and a drum gear. Each of the plurality of photosensitive drums has an axis extending in a first direction. The plurality of photosensitive drums is juxtaposed in a second direction perpendicular to the first direction. A position of the first supporting shaft and the second supporting shaft provided on one of the plurality of photosensitive drums in the second direction with respect to the outer frame is determined by contacting the first supporting shaft and the second supporting shaft to the first positioning portion. A position of the two of the first supporting shafts and the two of the second supporting shafts in a third direction perpendicular to both the first direction and the second direction with respect to the outer frame is determined by supporting the two of the first supporting shafts and two of the second supporting shafts on the second supporting portion.
