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SCANNING
20 September 1999
2.1.2 SCANNER DRIVE
[H]
[G]
[B]
[A]
[E]
[D]
[C]
[G]
[F]
A267D002.WMF
[E]
A stepper motor drives the scanner. The 1st and 2nd scanners [A,B] are driven by
the scanner drive motor [C] through the timing belt [D], scanner drive pulley [E],
scanner drive shaft [F], and two scanner wires [G].
- Book mode -
The scanner drive board controls and operates the scanner drive motor. In full size
mode, the 1st scanner speed is 122 mm/s during scanning. The 2nd scanner
speed is half that of the 1st scanner.
In reduction or enlargement mode, the scanning speed depends on the
magnification ratio. The returning speed is always the same, whether in full size or
magnification mode. The image length change in the sub scan direction is done by
changing the scanner drive motor speed, and in the main scan direction it is done
by image processing on the BICU board.
Magnification in the sub-scan direction can be adjusted by changing the scanner
drive motor speed using SP4-101. Magnification in the main scan direction can be
adjusted using SP4-008.
- ADF mode -
The scanners are always kept at their home position (the scanner H.P sensor [H]
detects the 1st scanner) to scan the original. The ADF motor feeds the original
through the ADF. In reduction/enlargement mode, the image length change in the
sub-scan direction is done by changing the ADF motor speed. Magnification in the
main scan direction is done in the BICU board, like for book mode.
Magnification in the sub-scan direction can be adjusted by changing the ADF motor
speed using SP6-007. In the main scan direction, it can be adjusted with SP4-008,
like for book mode.
2-2
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