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SCANNING
18 May, 1999
2.1.3 AUTO DOCUMENT FEEDER (ADF)
Overview
[A]
[J]
[D]
[F]
[B]
[H]
[C]
[G]
[E]
G027D504.WMF
The ADF feeds from the bottom page of the document stack on the ADF table.
During scanning, the page moves past the CCD unit, which is locked in position.
The document sensor [A] detects documents set on the table.
Before the start of scanning, the CCD unit moves to the ADF scanning position
(G027 only).
The pick-up [B] and feed [C] rollers feed the document into the ADF unit. Only the
bottom sheet is fed because the separation tab [D] prevents any other sheets from
feeding. The document feed-in roller [E] feeds the document through the ADF unit.
The feed speed depends on the reproduction ratio. For 100% copies, the feeding
speed is 37.6 mm/s.
The pressure plate [F] presses the document against the exposure glass through
the mylar guide [G] at the scan line, so that the document is within the CCD unit's
range of focus.
After the document passes the scanning position, the feed-out roller [H] feeds it
onto the document exit tray.
When scanning is finished, the CCD unit moves back from the ADF scanning
position to the home position (G027 only).
The registration sensor [J] detects the leading edge and the trailing edge of the
document, and checks for document jams.
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