Patent ID: 8467709
Filing Date: 2013-06-18
Classification: G03G

Abstract:
1. An image forming apparatus comprising: at least one image bearing member to bear a toner image thereon; a driving roller; a tension roller movable in such a direction that a distance between the driving roller and the tension roller changes; a transfer belt which is stretched by the driving roller and the tension roller while rotated by the driving roller to feed a receiving material while being contacted therewith so that the toner image on the image bearing member is transferred onto the receiving material or to directly receive the toner image from the image bearing member; a detector opposed to the tension roller with the transfer belt therebetween to optically detect a mark on a surface of the transfer belt, wherein the detector is movably supported while biased toward the tension roller, and the moving direction of the tension roller is substantially same as an optical axis of detection light emitted by the detector; and a regulator to regulate movement of the tension roller and the detector in a direction perpendicular to the moving direction of the tension roller.