Ricoh CH-C1, Обучение по обслуживанию

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216
Ch-C1 Training
Slide 216
Skew Correction

First skew correction location: Skew correction sensor/entrance
roller

Second skew correction location: Interval sensor/pre-scanning
roller
Skew Correction Sensor
Entrance
Roller
Interval
Sensor
Pre-scanning
Roller

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 (except small paper sizes B6, A5, B5, HLT), 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 the roller speeds do not
match, the original may buckle at the pre-scanning roller, but it should not do this
for these paper sizes, and feed errors could occur. If SP6020 is changed from the
default, the roller will stop (like for other job types), for more precise skew
correction. But this reduces the speed of the machine.
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