Patent ID: 7916360

Claim:
An image scanning apparatus comprising: an endless belt; a pair of rotating bodies being adapted to wind the belt therearound with tension and rotating for rotating the belt; an image scanning unit which moves in association with the rotation of the belt in a state of being fixed to the belt for scanning an image from a document; a pair of frame members connected to each other; a supporting shaft integrated with one of the frame members for rotatably supporting one of the rotating bodies; and a restraining member provided on the other frame member for restraining inclination of the supporting shaft caused by a shaft load applied to the supporting shaft by the belt being wounded around the pair of rotating bodies with tension, wherein the restraining member is a projecting bearing unit for receiving the supporting shaft including a fitting hole for fitting a distal end portion of the supporting shaft, where the restraining member is integrally formed with the frame member, wherein a clearance between the supporting shaft and the projecting bearing unit in a shaft load direction is smaller than a clearance between the supporting shaft and the projecting bearing unit in all directions that intersect the shaft load direction, and wherein a shaft load is applied to the supporting shaft in a shaft load direction when the shaft load is generated by the tension of the belt wound around the pair of rotating bodies.