The present invention provides for quick and efficient searches. A tolerance compensator is disposed between the roof structure and the body structure. The driving member can be made to project past the base by operating the handle. The arrangement is such that when the electromagnet is de-energised, the valve moves in acceleration towards the open position under the action of the first spring until the action of the latter stops, and then the valve moves in deceleration into the open position under the action of the second spring. A recognizing unit is also included that is configured to recognize lengths in the main scanning direction and the sub scanning direction of the manuscript, based on a displacement of the manuscript sensor from the reference position. The power supply filter may be included as part of a power distribution panel.