Abstract: An original document reading apparatus includes a plurality of point light source elements (e.g. a LED array) in a main scanning direction beneath an original document table, a moving device that moves the point light source elements in a sub scanning direction, and a photo acceptance unit that accepts light reflected from the original document and determines a size of the original document based upon a reaction of a pixel to the light. The plurality of point light source elements are divided into a plurality of blocks to be turned on and off in successive turns per a block starting from a block corresponding to an original document minimum size to a block corresponding to an original document maximum size.

Abstract: A top cover and a guide member form a discharge port. A plurality of guide ribs is provided on an edge portion of the top cover. A plurality of projecting pieces is provided on a guide member at positions not to face to the guide ribs. These guide ribs and projecting pieces are used for guiding a roll sheet to a discharge port. At least one of the guide ribs is provided with an extended portion extending upstream in a feeding direction to prevent the roll sheet 3A from curving in a direction vertical to the feeding direction. Thus, the inability to discharge the roll sheet can be avoided.