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2) Sensing of document size by the document width sensor (DWS) in
the feed section
Sensing of document size by the document width sensor is used,
in automatic paper size and automatic magnification selection
mode, to determine whether the document is A4 or A5 (11" x 8.5"
or 8.5" x 5.5").
When a document comprising stacked sheets of different sizes is
set in the document tray, the document size cannot be recognized
by the sensors in the document tray. Therefore, this function is
provided to sense the document size behind the resist roller after
the feeding section has fed the document, as far as documents of
A4 or A5 size (11" x 8.5" or 8.5" x 5.5") (laterally oriented) is
concerned. Consequently, if A4- and A5-size (11" x 8.5" or 8.5" x
5.5") document sheets (laterally oriented) are stacked and set in
the document tray, document size recognition by the document
width sensor (DWS) in the feeding section is preferred over that of
the sensor in the document tray.
When A4- and A5-size (11" x 8.5" or 8.5" x 5.5") document sheets
(laterally oriented) are stacked and set in the document tray, the
document length sensors (DSL1, DSL2) will not be actuated.
Therefore, judgment can be made between A4 or A5, or 11" x 8.5"
or 8.5" x 5.5" by sensing the document width with the document
width sensor (DWS) in the feed section.
Feed section document width sensor (DWS)
A4
B5
Feed section document width sensor (DWS)
Status of feed section document width sensor (DWS)
F: H output (sensed)
Document size
: L output
A4
F
A5
Feed section document width sensor (DWS)
Feed section document width sensor (DWS)
Status of feed section document width sensor (DWS)
F: H output (sensed)
Document size
: L output
11" x 8.5"
8.5" x 5.5"
– 14 –
11" x 8.5"
8.5" x 5.5"
F
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