Patent ID: 7512375

Claim:
An image forming apparatus comprising: an automatic document conveying apparatus comprising: a table configured to hold thereon a document bundle; a first conveyance path configured to reverse and convey a document of the document bundle, and including a sensor for detecting a size of the document; a scanning device configured to scan the document conveyed by the first conveyance path; first and second switchback mechanisms each provided at a downstream position of the scanning device to switch back and convey the document, the second switchback mechanism communicating with the first conveyance path; and a second conveyance path configured to guide the document from the scanning device to any one of the first and second switchback mechanisms, to reverse and convey the document from the first switchback mechanism to the second switchback mechanism, and to discharge the document, wherein the document is reversed and conveyed by the first conveyance path through the scanning device without being scanned, with a first surface of the document facing the scanning device, guided to the first switchback mechanism by the second conveyance path, switched back by the first switchback mechanism, reversed and conveyed to the second switchback mechanism by the second conveyance path, and switched back by the second switchback mechanism to detect a size of the document based on information sent from the sensor, and thereafter, the document is reversed and conveyed by the first conveyance path to the scanning device to have the first surface of the document scanned.