Riso V8000 Series, Technical Manual

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[13 - 4]
CHAPTER 13. AF SCANNING SECTION
2. AF Original Scanning Mechanism (with Auto Base Control)
(This operation occurs only when the original scanning density is set to “Auto.”)
Upon completion of the AF original setting operation, pressing the START key moves the lamp carriage to
the shading position. It then moves to the auto-base-control position after shading compensation has
been performed. The AF read pulse motor meanwhile operates in the forward direction, rotating the
original registration roller, two original read rollers, AF white roller, and original ejection roller in the feed
direction. The original is fed forward 22.5 mm and stops after the original IN sensor activates (light path
blocked), and the intensity of the original background color is scanned by the CCD in this position (auto-
base-control position). The FB read pulse motor then moves the lamp carriage back 3 mm in the return
direction (AF scanning position).
The AF read pulse motor immediately operates in the forward direction, and the read/write signal
activates at the same time to start original scanning. When the original is moved away, the read/write
signal is deactivated a preset length of time after the original IN sensor is deactivated (light path open).
The AF read pulse motor then operates at high speed as soon as scanning is complete. Once the
original is transported a preset distance after the original OUT sensor deactivates, the AF read pulse
motor stops, the lamp carriage is returned to the standby position, and the AF original scanning operation
is complete.
The auto-base-control function does not operate in the Photo, Duo, or Dot process modes.
3. AF Original Scanning Mechanism
Upon completion of the AF original setting operation, pressing the START key operates the AF read pulse
motor [A] in the forward direction to rotate the original registration roller, two original read rollers 1 & 2, AF
white roller, and original ejection roller in the feed direction. The original is fed forward 25.5 mm after the
original IN sensor activates (light path blocked), and scanning starts when the read/write signal activates
(the original pickup roller returns to the standby position).
When the original is moved away, the read/write signal is deactivated a preset length of time after the
original IN sensor is deactivated (light path open).
The AF read pulse motor [A] then operates at high speed as soon as scanning is complete. Once the
original is transported a preset distance after the original OUT sensor [G] deactivates, the AF read pulse
motor stops, the lamp carriage is returned to the standby position, and the AF original scanning
S1304
Original ejection roller
Original OUT sensor
Original IN sensor
Original read roller 2
Original read roller 1
Original registration roller
AF white roller