Double Feed Detection Function; Long Document Mode - Canon DR-4010C User Manual

Chapter 3 Basic Operation

Double Feed Detection Function

The scanner is equipped with a [Double Feed Detection] function that automatically detects when
two or more pages are fed at the same time (double feed) while scanning continuously.
There are two methods for multiple feed detection. The detection method is selected by the ISIS/
TWAIN driver.
Detecting Double Feed by Document Length
This detection method is effective when scanning a document on pages that are all of the same
size. The length of the first page scanned is used as a standard against which the rest of the
pages are compared. If any page is 2.0" (50 mm) longer or shorter than the first page, it is
considered a double feed and scanning stops.
Detecting Double Feed with Ultrasonic Waves
This detection method is effective when scanning a document on pages that are different sizes.
Ultrasonic waves are used to detect pages that are fed at the same time as well as the space
between pages. Scanning stops if a double feed is detected.
Note
• Ultrasonic double feed detection works only when the documents overlap by 2.0" (50 mm)
or more.
• If the documents are stuck together with static electricity, the ultrasonic double feed
detection method will not correctly detect them as a double feed.

Long Document Mode

Normally, the scanner can scan documents up to 14" (356 mm) long. However, if you change the
paper size setting to Long Document mode, you can scan documents up to a maximum of 39.2"
(1,000 mm) long.
IMPORTANT
When scanning in the Long Document mode, set the paper size for the ISIS/TWAIN driver to
"Auto-detection" to allow the scanner to detect and scan documents up to 39.2" (1,000 mm)
long. Note the following when using the Long Document mode:
• Scanning documents up to 39.2" (1,000 mm) long may not be possible with some scanning
modes.
• Documents may be scanned more slowly when the scanner is scanning with automatic size
detection in Long Document mode.
(See "Long Document Mode Settings," on p. 3-31.)
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