Patent ID: 8391759
Filing Date: 2013-03-05
Classification: G03G

Abstract:
1. A belt device comprising: a belt member that is stretched over a plurality of rollers including a first roller, a second roller and a third roller arranged from upstream to downstream in this order and moves in a predetermined moving direction; a plurality of image carriers in contact with the belt member, each image carrier carrying respectively each toner image for each color; a secondary transfer roller provided at a position opposing the third roller such that the belt member is nipped therebetween forming a secondary transfer nip so that a toner image formed on the belt member is transferred onto a recording sheet that is conveyed to a position of the secondary transfer nip; a movable roller that detaches the belt member from the plurality of image carriers; a detecting unit that detects deviation of the belt member in a belt width direction of the belt member; and a preventing member that is arranged near to the detecting unit, and that prevents deviation of the belt member in a direction other than the moving direction and the belt width direction, wherein