Patent ID: 7778566
Filing Date: 2010-08-17
Classification: G03G

Abstract:
1. A belt cleaning device for cleaning a surface of a belt that conveys a conveying object in a conveying direction, comprising: a cleaning roller disposed in confrontation with the surface of the belt to rotate in a reverse direction of the conveying direction, the cleaning roller being made from a synthetic rubber with a resistance of 10 a backup roller disposed in confrontation with the cleaning roller with the belt interposed between the cleaning roller and the backup roller; a roller-pressing-state setting mechanism that selectively sets a state of the backup roller to: a second state in which a second pressure is applied between the cleaning roller and the surface of the belt, the second pressure being less than the first pressure; a secondary roller having a peripheral surface and disposed in contact with the cleaning roller; and a cleaning blade disposed in contact with the peripheral surface of the secondary roller; wherein the cleaning roller, the backup roller, the secondary roller, and the cleaning blade are positioned so that a frictional force generated in a region of contact between the secondary roller and the cleaning blade is smaller at both ends in a paper width direction than at an inner region between the both ends to suppress a warping of the cleaning blade at the both ends in the paper width direction.