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October 9th, 1995
DETAILED SECTION DESCRIPTIONS
SCANNER PROCESS
Optional Steps
1. Size Detection
If selected, this is done after Initialization.
1-1. Main Scan Direction (Document Width)
The first carriage moves to the book mode standard position ([C] in the
diagram at the start of section 2.2.1). Then, the scanner scans 5 mm from the
book mode standard position.
The scanner determines the document width in the main scan direction from
the output signal level. The edge of the document is detected by the
difference between the level of the document data and the background signal
which is provided by the silver plate attached to the platen cover across the
main scan.
If there is a gap at the leading edge, such as a tear, extending more than 1
mm across the paper and more than 5 mm down the paper, the machine will
not scan the document past this gap.
1-2. Sub Scan Direction (Document Length)
The scanner scans the maximum length.
The scanner determines the document length in the sub scan direction from
the output signal level. The edge of the document is detected by the
difference between the level of the document data and the background signal
which is provided by the silver plate attached to the platen cover along the
sub scan.
If there is a gap in the edge by the silver plate, such as a tear, extending
more than 1 mm down the paper and more than 5 mm wide, the machine will
not scan the document past this gap.
2-7
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