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Abstract

A document size detection device accurately detects document size while reducing the number of document size detection sensors required. The device includes: a document detection sensor positioned at a first location on a document insertion line across a document feed path, the first location being positioned within the width of a first-sized document; a document position sensor positioned at a second location on a scan stand-by line across the document feed path, the second location being positioned within the width of the first-sized document; a document size detection sensor positioned at a third location between the document insertion line and the scan stand-by line, and within an area formed between lateral boundaries of the first-sized document and a second-sized document; a document feed roller for feeding the document; and a controller for driving the document feed roller to feed the document up to the scan stand-by line if the document detection sensor detects the document. The controller determines the document to be a first-sized document if the document size detection sensor fails to detect the document, and determines the document to be the second-sized document if the document size detection sensor detects the document.

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First Claim