Patent ID: 8401427
Filing Date: 2013-03-19
Classification: G03G

Abstract:
1. An image forming apparatus of electronic photography, comprising: a casing having an opening at a front end; a belt unit configured to be disposed in the casing, including: a sheet cassette detachably installed in a bottom of the casing for holding a sheet; a fixing unit disposed in the casing nearer to the second roller than the first roller; a drawer detachably installable in the casing, including: a frame for holding the photosensitive drums, including a guide protrusion, the guide protrusion including a plurality of engagement portions formed on a top surface of the guide protrusion at a plurality of predetermined locations, each engagement portion including: a scanner unit disposed in the casing for exposing the photosensitive drums, the scanner unit including a surface facing the plurality of photosensitive drums; and a guide member disposed in the casing for guiding the drawer movable in the first direction between the belt unit and the scanner unit, the guide member including a floor surface and a ceiling surface forming a groove that extends in the first direction, the guide member guiding the guide protrusion of the frame between the floor surface and the ceiling surface; an engaging member disposed on the ceiling surface of the guide member, the engaging member being movable to protrude into and retract from the groove, the engaging member being configured to be displaced between an engagement position and a release position, the engaging member being engaged with the engagement portion when the engaging member is at the engagement position and being disengaged from the engagement portion when the engaging member is at the release position; and an urging member configured to urge the engaging member in a direction from the release position toward the engagement position, wherein the first roller is disposed nearer to the opening of the casing than the second roller, wherein, when the image forming apparatus is placed on a plane, a distance from the first roller to the plane is larger than a distance from the second roller to the plane, and a distance from the first roller to the plane is longer than a distance from the fixing unit to the plane, and wherein the drawer is detachably installable between the surface of the belt facing to the photosensitive drums and the surface of the scanner unit facing to the photosensitive drums.