Belt driving device and image forming apparatus

Abstract

A belt driving device includes: a belt; and a drive roll and driven rolls that rotate the belt wound around the rolls. As part of the driven rolls, a first driven roll and a second driven roll with a same roll diameter, each having a greatest exceeding eccentricity section or insufficient eccentricity section in a mutual common area are disposed in a non-displaced state in that order at positions with an interval in a rotational direction of the belt, and are driven to rotate so that greatest exceeding eccentricity sections or insufficient eccentricity sections each being the greatest exceeding eccentricity section or insufficient eccentricity section are in opposite phase at central positions in the rotational direction of contact portions of the belt with the first driven roll and the second driven roll.

Dependencies are inferred from the claim text.