Apparatus and method for reading document

A document reading apparatus comprising:

• a sheet feeding path on which a document is fed onto a platen glass;
• an image reader for reading the document to be fed onto the platen glass;
• a sheet discharging path disposed downstream of the platen glass;
• skew quantity calculating means for calculating a skew quantity of the document with respect to the sheet feeding path;
• and
• a reading controller for controlling a reading timing by the image reader,
• wherein the reading controller does not read the document in the case where the skew quantity calculated by the skew quantity calculating means exceeds a preset allowable value and in contrast, controls a document reading starting timing to read the document by referring to a detection timing of any one of a plurality of document end detecting sensors only in the case where the skew quantity ranges within the allowable value.

A document reading method comprising the steps of:

• providing a pair of document end detecting sensors respectively having first and second detection points on a first straight line perpendicular to a document feeding direction;
• providing a third document end detecting sensor having a third detection point on a straight line passing one of the first and second detection points downstream of the first straight line while keeping an angle between the first straight line and the same within a preset allowable value;
• and
• judging by a reading controller that a skew quantity of a document exceeds the allowable value in the case where the third document end detecting sensor detects a document end after only one of the pair of document end detecting sensors detects the document end and before the other document end detecting sensor detects the document end.