User Guide

4-5
Chapter 4 Other Functions
3. Press the Start Key to start scanning.
“Verifying…” is displayed.
Hint
If the specified count is exceeded while scanning, or if the
scanned count does not reach the specified count when
scanning is finished, an error is displayed.
The specified count is exceeded while scanning
Scanning finishes without reaching the specified count
■ Double-Feed Detection
The scanner can detect double feeds. Two detection
methods are used: comparison of document lengths, and
ultrasonic detection of spacing between documents, which
is set in the ISIS/TWAIN driver.
IMPORTANT
• The message that appears when a double feed is detected
depends on the Rapid Recovery System setting specified in
the ISIS/TWAIN driver. See “When the Rapid Recovery
System is Enabled” on p. 3-25 for details.
• Double feed detection in the Count-Only mode is set in the
User Mode, and double feeds are detected ultrasonically.
(See “Double-Feed Control Setting” on p. 4-10.)
Detecting Double Feeds by Document Length
This detection method is effective when scanning
documents with pages of the same size. The length of the
first page scanned serves as a standard for comparing
subsequent pages, and when a page is detected to be
approximately 1.4 inches (35 mm) longer or shorter than
the standard, a double feed is detected and document
transport is stopped.
Ultrasonic Double-Feed Detection
This detection method is effective when scanning
documents with pages of different sizes. The space
between overlapping pages is detected ultrasonically, and
document transport stops when a double feed is detected.
IMPORTANT
• Ultrasonic double-feed detection works only when the
document pages overlap by at least two inches (50 mm).
• If documents stick together due to static electricity, Ultrasonic
Double-Feed Detection may not function correctly.
• If the presence of adhesive notes or labels on pages is
detected as a double feed and you do not want to remove
them for scanning, a non-detection zone can be specified in
the ISIS/TWAIN driver settings. (See “Double Feed Detection”
on p. 8-19.)