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Entrance
Roller
Feed
Roller
Interval
Sensor
Pre-scanning
Roller
Slide 266
# Skew correction is done at the two circled locations.
$ Skew correction sensor/entrance roller: When the sensor detects the
leading edge of the original, the roller stops for a certain period. This
buckles the original and corrects the skew.
$ Interval sensor/pre-scanning roller: The actual method depends on the
paper size, and whether both sides will be scanned.
For single-sided scans larger than A5, after the entrance roller starts
rotating, the feed motor increases the speed of the feed roller to reduce
the interval between the original just fed and the original ahead being
scanned. When the interval sensor detects the leading edge of the
original approaching the pre-scanning roller, the pre-scanning roller slows
down slightly. The feed roller is still feeding the paper faster than the pre-
scanning roller, and this slows the original at the leading edge and
corrects skew. If SP6020 is changed from the default, the roller will stop
(like for other job types), for more precise skew correction.
For other types of job, the pre-scanning roller stops. All duplex scans are
stopped at this roller, for the best possible skew correction. This is
because both sides are scanned at the same time, by sensors on
opposite sides of the paper. Any skew in the ADF would therefore be
noticeable on the copy.
# The rollers are driven by different motors, which makes it possible for one roller
to stop or be slower while the other one is still going.
$ Entrance roller, Feed roller (1st transport roller): : Driven by the feed motor
$ Pre-scanning roller: Driven by the transport motor
# The amount of buckle at each location can be adjusted with SP 6006.
$ 6006 005: Corrects the amount of buckle at the entrance roller
$ 6006 006: Corrects the amount of buckle at the pre-scanning roller
Skew Correction - 1
! First skew correction location: Skew
correction sensor/entrance roller
266
Skew Correction
Sensor
V-C3 Training
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