Patent ID: 7369793
Filing Date: 2008-05-06
Classification: G03G

Abstract:
1. A belt unit that is detachably mountable in an image-forming apparatus, comprising: at least two rollers, each having a roller shaft; an endless belt looped around the two rollers; and an outer frame disposed around the endless belt and having two roller-supporting walls rotatably supporting the rollers therebetween, the roller shafts of the rollers extending in a direction intersecting the roller-supporting walls, wherein the outer frame includes a first frame and a second frame stacked in a direction intersecting a plane defined by axes of the roller shafts; bearings disposed in opposing parts of the first and second frames, the bearings having roller-supporting through-holes formed therein that are aligned when the two frames are stacked together to support the roller shafts; and a joining member that rotatably joins the first and second frames with each other.