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October 9th, 1995
DETAILED SECTION DESCRIPTIONS
SCANNER PROCESS
Optional Steps
1. Size Detection
[A]
[C]
[D]
[B]
G404D508.wmf
If selected, this is done after document table lift/paper feed
1-1. Main Scan Direction (Document Width)
First of all, the original is fed to the scan ready position between the read
sensor [B] and the size detection position [C]. Then the first carriage moves
to the size detection position [C] from the ADF scanning position [D]. After
that, the original is fed to the ADF scanning position.
As a result of the above operation, the original is fed 5 mm past the first
carriage. During this operation, the CPU detects the original width. The edge
of the document is detected by the difference between the level of the
document data and the background level which is provided by the black
bracket located over the ADF exposure cover.
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.
After finishing the above operation, the first carriage returns to the ADF
scanning position.
2-13
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