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8.5 Double-feed Detection Conditions
Detection by Document Length
Sheets of the same length shall be set in the ADF at a time.
Document length deviation: 1% or less
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%.