Canon imageFORMULA ScanFront 400 Instruction Manual - Page 89

Chapter 4 Operating Procedures Double feed detection by Ultrasonic The scanner uses an ultrasonic sensor to detect when two or more documents are fed together, and stops feeding when a double feed is detected. IMPORTANT • This method is effective when documents overlap by 1.97" (50 mm) or more. It does not function if only a slight portion of the document is overlapping. • When [Scanning Side] is set to [Folio], [Double feed detection by Ultrasonic] is grayed out and cannot be selected. Double feed detection by length The scanner detects by document length when two or more documents are fed together, and stops feeding when a double feed is detected. IMPORTANT • Using the length of the first page of the document as a reference, the scanner determines a double feed when it detects a document with a length at least 1.38" (35 mm) longer or shorter than the reference length. • Set [Double feed detection by length] to [OFF] when scanning a document that contains pages of different lengths. Non Separation Feeding Mode Set [Non Separation Feeding Mode] to [ON] or [OFF] according to the feed method of the document. (See p. 44.) Skip Blank Page When [Skip Blank Page] is selected in the scanning side settings, this setting is enabled, and you can adjust the sensitivity level for skipping blank pages. Hint • The initial value for the Skip Blank Page option is set to "90." • As you lower the value from the default setting, pages of the document with text become more likely to be skipped as well. 89