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Entrance Roller
Interval
Sensor
Pre-scanning
Roller
ADF
Exposure
Glass
Slide 260
# The most important points are on the slide.
$ The entrance roller is also known as the grip roller. Late name change from
designers – no time to check all documents.
# Here is a brief overview of how the ADF works.
$ The pick-up roller feeds the original to the feed belt and separation roller.
Skew is corrected at the entrance roller, but only for small original sizes (B6,
A5, HLT), or for duplex scanning (any size).
For sizes larger than A5, the pre-scanning roller slows, which buckles the
paper and corrects skew (the entrance roller is still turning at the original
speed, which is now faster than the pre-scanning roller, so the paper
buckles and skew is corrected).
$ When the skew correction sensor detects the leading edge of the original,
the pre-scanning roller starts. Skew is also corrected at the pre-scanning
roller.
$ The CCD is below the ADF exposure glass, where the original is scanned.
$ For two-sided original scanning, the CIS scans the reverse side while the
original leaves the ADF.
Overview
ADF Transport Belt
! No inverter - reverse sides are scanned by a CIS
(Contact Image Sensor) built into the ADF
! Skew correction at two places
260
Feed Belt/Separation Roller
Pick-up Roller
CIS
V-C3 Training
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