Patent ID: 7711299
Filing Date: 2010-05-04
Classification: G03G

Abstract:
1. A color image forming apparatus comprising: a belt that travels in a prescribed direction; a plurality of image carriers arranged in parallel in the prescribed direction, and opposed to the belt and carrying developing agent images of different colors respectively; a backup roller arranged in opposed relation to the belt; a cleaning roller arranged in opposed relation to the backup roller with the belt sandwiched therebetween, and adsorbing an adherent to the belt by a potential difference produced between the backup roller and the cleaning roller; a discharge member opposed to the belt between a position more downstream in the prescribed direction than a position where the cleaning roller is opposed to the belt and a position more upstream in the prescribed direction than a position where the image carrier arranged on the most upstream side in the prescribed direction is opposed to the belt, for discharging the belt; a first belt roller that contacts the belt between the position where the cleaning roller is opposed to the belt and the position where the image carrier arranged on the most upstream side in the prescribed direction is opposed to the belt; and a second belt roller arranged so as to be spaced away from the first belt roller in the prescribed direction and having the belt wound between the first belt roller and the second belt roller, wherein the discharge member is opposed to the belt between the position where the cleaning roller is opposed to the belt and a position where the first belt roller contacts the belt.