Drum cartridge

A drum cartridge attachable to and detachable from an image forming apparatus, the drum cartridge comprising:

• a casing;
• a rotatable photosensitive drum;
• a drum bearing attached to the casing, the drum bearing being provided on an end of the photosensitive drum in a rotation shaft axis direction to support a rotation shaft of the photosensitive drum;
• a charging roller configured to contact a surface of the photosensitive drum, and charge the photosensitive drum;
• a charging roller bearing attached to the casing, the charging roller bearing being provided on an end of the charging roller in a rotation shaft axis direction to support a rotation shaft of the charging roller;
• a charging roller urging member configured to be compressed in a radial direction, of the photosensitive drum, and one end of which contacts the casing and another end of which contacts the charging roller bearing;
• a cleaning roller configured to contact a surface of the charging roller, and clean the charging roller;
• a cleaning roller bearing provided on an end of the cleaning roller in a rotation shaft axis direction to support a rotation shaft of the cleaning roller;
• and
• a cleaning roller urging member configured to be compressed in a radial direction of the charging roller, and one end of which contacts the charging roller bearing and another end of which contacts the cleaning roller bearing,
• wherein the charging roller bearing includes a first regulation portion configured to regulate the cleaning roller bearing in a circumferential direction of the charging roller, and a second regulation portion configured to regulate the cleaning roller bearing in a rotation shaft axis direction of the charging roller,
• wherein the cleaning roller includes a third regulation portion configured to regulate the cleaning roller bearing in a rotation shaft axis direction of the cleaning roller,
• wherein the cleaning roller is regulated in a circumferential direction by the charging roller bearing, and
• wherein the cleaning roller bearing is regulated in the rotation shaft axis direction of the cleaning roller by the cleaning roller and the charging roller bearing.