Patent ID: 8571433

Claim:
A roll supporting mechanism rotatably supporting an electrically-conductive roll, the roll supporting mechanism comprising: an electrically-conductive portion that contacts with one circumferential portion of an outer periphery of the electrically-conductive roll to conduct electricity to the electrically-conductive roll, an insulating portion that contacts with another circumferential portion of the outer periphery of the electrically-conductive roll at a contact portion smaller than a contact portion of the electrically-conductive portion and that is formed by an insulating material, and a pressing member that presses the electrically-conductive portion against the electrically-conductive roll, wherein the pressing member presses the electrically-conductive portion against the electrically-conductive roll further toward the outer side in the rotation-axis direction of the electrically-conductive roll than the contact portion at which the electrically-conductive roll and the electrically-conductive portion contact with each other.