Patent ID: 8244153
Filing Date: 2012-08-14
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a plurality of detachable unit components; and a frame assembly to hold the detachable unit components in predetermined positions in the image forming apparatus, wherein the frame assembly includes: a pair of metal frames; and a pair of resin frames, each of which is attached to one of the metal frames, wherein each of the metal frames includes: a first positioning structure, which corresponds to an original point of the metal frame; a first fixing structure; a second positioning structure; wherein each of the resin frames includes: a first positioning structure, which corresponds to an original point of the resin frame; a fixing structure; a second positioning structure; a plurality of pressing pieces, by which the resin frame is pressed against one of the metal frame; wherein each of the resin frames is set in a predetermined position with respect to one of the metal frames by having the first positioning structure of the resin frame to coincide with the first positioning structure of the metal frame so that the original point of the resin frame coincides with the original point of the metal frame; wherein each of the resin frames is fixed to one of the metal frame by having the fixing structure of the resin frame fixed to the fixing structure of the metal frame; wherein each of the resin frames is restricted from moving in a specific direction and allowed to move in a different direction with respect to one of the metal frames by having the second positioning structure of the resin frame to coincide with the second positioning structure of the metal frame; wherein a first length between the coinciding first positioning structures of the resin frame and the metal frame and the coinciding fixing structures of the resin frame and the metal frame is smaller than a second length between the coinciding first positioning structures of the resin frame and the metal frame and the coinciding second positioning structures of the resin frame and the metal frame; and wherein the plurality of pressing pieces are provided in positions outside closer to outer edges of the resin frame with respect to the first positioning structure and the fixing structure of the resin frame.