Patent ID: 6937367

Claim:
A document reading apparatus comprising: a document table for supporting a single document; a document tray for receiving a stack of documents; a line sensor for reading an image from each of the documents in units of lines parallel to a main scanning direction; a sensor transporter for transporting the line sensor to scan the document on said document table from one reading surface edge in the sub-scanning direction during a first reading mode; a document feeder for feeding each document received in said document tray such that the document is scanned from another reading surface edge opposite to the one reading surface edge of the document on said document table in the sub-scanning direction during a second reading mode; and a processing section for processing a reading result of said line sensor as image data; wherein said processing section has a controller for controlling a read start timing to compensate for a read range which may positionally deviate with respect to an identical effective reading area of each document between the first and second reading modes, and wherein said controller is configured such that the read start timing is set in the first reading mode at a timing that transportation of said line sensor is started from a reference reading position where a roading surface edge of the document faces said line sensor, and is set in the second reading mode at a timing that the effective reading area reaches said line sensor located at the reference reading position.