Fujitsu FI 4220C - Document Scanner, Operator'S Manual, Page: 170 / 196

8.5 Double-feed Detection Conditions
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8.5 Double-feed Detection
Conditions
There are three double-feed detection modes: document thickness,
document length, and both document thickness and length. The
following conditions must be satisfied in each of these detection
modes.
■ ■ ■ ■
Detection by Document Thickness
Sheets of the same thickness shall be set in the ADF at a time.
•
Document thickness: 0.065 to 0.15mm
•
Printed area: 12% or less
•
No black printed areas are allowed at the center area
(26 x 10mm) at the leading edge of the document.
•
Punched holes are not allowed within 35mm of the vertical
center line of the document.
•
The deviation in the amount of the light transmitted through
background areas must not be less than 10%.