4-6Chapter 4 Other Functions■ Skew DetectionIf a long document page becomes skewed as it is fed, thepage may press against the edge of the feed inlet ortransport path and be damaged.When the scanner detects that a skewed page is contactingthe edge of the transport path, an error message isdisplayed and transport stops.IMPORTANT• A page that becomes skewed while it is fed is only detected bythe sensors as skewed if it contacts the edge of the transportpath during scanning.• Note that the ISIS/TWAIN driver has a Deskew function thatcan detect a skewed document from the scanned image, andstraighten it.■ Staple DetectionWhen sensors at both sides of the feed inlet detect the bentcorner of a stapled document, an error message appearsand feeding stops.IMPORTANT• Staple detection detects the bent corner that occurs when oneof the four corners of a document has been stapled.• Staple detection may not operate properly in the followingcases where bending does not occur in documents.– The document is stapled at two or more corners.– The document is size smaller than STMT/A5.– The position of the left or right document guide has beenchanged, and the document has been shifted to the left orright side. (See “Adjusting the Document Guides” on p. 3-8.)Hint• Staple detection is controlled in the ISIS/TWAIN driver, andthe detection level can be set in the User Mode. (See “StapleDetection Level Setting” on p. 4-10.)• Staple detection for the Count-Only mode can be set in theUser Mode. (See “Staple Detection Setting” on p. 4-10.)■ Folio ScanUse Folio Scan to scan very large documents (up to 22" ×34"/A1 size) by folding each document sheet and scanningthe front and back. The resulting images are thenrecombined to reconstruct an image of the entire page.IMPORTANT• Folio scanning requires that you feed each page manually(The Separation Off key is lit).• Fold each page with a sharp, straight crease. Otherwise, thepaper may jam or the image may be misaligned.Reconstructed ImageSeparationOff KeyFront(whenfolded)Back(whenfolded)