Patent ID: 8731430
Filing Date: 2014-05-20
Classification: G03G

Abstract:
1. A charging device comprising: a corona charging device including a charging electrode; a cleaning member for cleaning the charging electrode; a screw; a carriage including an engagement portion that engages with a concave portion of the screw, an urging member for urging the engagement portion toward the screw, and a regulation member for regulating deformation of the urging member, wherein the carriage moves the cleaning member in a longitudinal direction of the corona charging device as the screw rotates; and a retreat member configured to abut on the regulation member at an end of the screw and retreat the regulation member from a regulation position to a retreat position, wherein the urging member is regulated not to be displaceable greater than a difference between the concave portion and a convex portion of the screw when the regulation member is at the regulation position, and is displaceable greater than the difference between the concave portion and the convex portion of the screw when the regulation member is at the retreat position.