Patent attributes
A document reading apparatus includes a document feed device configured to separate documents and to feed the documents one by one from a paper feed tray, an image reading device configured to read an image of each the documents at a reading position provided on a reading glass plate, and a document holding member arranged on a front surface side of the reading glass plate at a position opposing the image reading device. The document reading apparatus also includes a first and a second reading pattern mark provided on the document holding member at a first and second position opposing the surface of the reading glass plate, respectively. The first and second reading pattern marks have a length which is greater than a width of each of the documents. Moreover, the document reading apparatus includes a control device configured to determine the width of each of the documents by determining a first and second boundary of a left side edge and right side edge of the documents with respect to the first and second reading pattern marks when each of the documents passes over the first position and the second position.
