The documate 3640 is a departmental duplex flatbed scanner with the automatic document feeder adf that scans in duplex mode the a4legal flatbed is the only departmental scanner that can be programmed to automatically scan customisable applications or devices ultrasonic double feed detection insures that no pages are missed due to a misfeed or stapled document in the adf tray documents can be converted to text searchable pdf in one easy step the xerox documate 3640 is the perfect soluti