Ricoh DD 5450, Руководство по обслуживанию на месте, Страница: 133 / 403

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Chapter 3 Paper Feed Section
(5) Paper Feed Length
The "paper feed length" is the length by which the paper feed roller feeds out the print paper. When
the paper feed roller feeds out the print paper, the guide roller is pressed against the timing roller
and does not rotate; as a result, the paper arches up between the paper separator and the
timing roller, since the distance between these two items is only 65 mm, while the length by which
the paper is fed out from the paper feed roller is 80 mm. This arching has the effect of correcting
any skewing of the paper (as the lead edge is held firm between the guide and timing rollers). It
also has the effect of lessening the load on the timing roller when it feeds the paper through, thus
minimizing slippage. For feed amount, the paper lead edge is detected by the paper top detect
sensor and paper feed is controlled by program (HELP-039).
HELP-039 →See page.342
Cam follower
Paper feed cam
Timing roller
Guide roller
Paper top detect sensor
Paper feed roller
Paper separator
Double feed detect sensor
Signal sensor
● If paper feed length is too large: The arching dimension will be too large, and if the paper is of
a very stiff type, it will buckle up between the paper feed roller and the paper feed inlet (upper),
causing a PAPER JAM error ("PAPER JAM ON THE FEEDER SIDE").
● If paper feed length is too small: The arching dimension will be too small, so that arching will be
unable to correct skewing of the paper, and skewing and wrinkling will be liable to occur.
Furthermore, the slippage that occurs when the timing roller feeds the paper through will be very
large,resulting in printing position errors.
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