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June 30, 1998
PAPER FEED
Paper Size Detection
[C]
[B]
[A]
A229D594.WMF
The by-pass paper size sensor [A] (variable resistor) monitors the paper width. The
rear side fence is connected to the by-pass paper size sensor actuator. When the
paper side fences [B] and [C] are positioned to match the paper width, the
electrical resistance of the sensor changes in accordance with the side fence
position, This informs the CPU of the paper width.
For the first copy from the by-pass feed table, the scanner makes a full distance
scan. For example, for A4 sideways copy paper (the same width as A3), the
scanner scans the full A3 length of the exposure glass. However, the registration
sensor measures the length of the first sheet of paper (by monitoring the leading
and trailing edges). For the second and following copies, the copier uses the
correct paper length.
2-105
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