Roller cleaning mechanism and image formation apparatus therewith

A roller cleaning mechanism comprising:

• a cleaning member that makes contact with, along an axial direction of, a conveying roller for conveying a sheet;
• a holder that holds the cleaning member;
• a housing that houses the holder;
• and
• an urging member that urges the holder in a direction opposite to a rotation direction of the conveying roller,
• the roller cleaning mechanism removing foreign matter adhering to an outer circumferential face of the conveying roller,
• wherein
• the holder is supported so as to be swingable with respect to the housing about a swing shaft parallel to the axial direction of the driving roller,
• when the conveying roller rotates, the holder swings in the rotation direction of the conveying roller with a rotative driving force thereof that is stronger than an urging force of the urging member so as to be arranged at a cleaning position where a cleaning face of the cleaning member makes contact with the outer circumferential face of the conveying roller, and
• when the conveying roller is halted, the holder swings in the direction opposite to the rotation direction of the conveying roller by the urging force of the urging member so as to be arranged at a retracted position where a part of the cleaning member different from the cleaning face thereof makes contact with the outer circumferential face of the conveying roller.