Riso V8000 Series, Technical Manual

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[12 - 4]
CHAPTER 12. FB ORIGINAL SCANNING SECTION
2. Scanning Mechanism
The FB read pulse motor drives the front and rear wire-spool pulleys via the two-stage reduction pulleys
linked by the timing belt.
The front and rear wire-spool pulleys are configured symmetrically.
One end of the wire is secured to the frame via the spring, and is attached to the lamp carriage via sliding
pulley 2 mounted on the mirror carriage. It is wound approximately 7 times around the wire-spool pulley
from the opposite side via fixed pulley 2 secured to the frame. It is then attached to the frame via fixed
pulley 1 mounted on the frame, and sliding pulley 1 mounted on the mirror carriage].
The mirror carriage and lamp carriage are able to move horizontally along the rails attached to the
respective sliders.
The mirror carriage carries two mirrors (mirror 2 and mirror 3), and the lamp carriage carries the original
illumination lamp (and lamp inverter) and mirror 1.
The mechanism uses a “full/half-rate mirror scanning” system, in which the mirror carriage moves 1/2 L
mm as the lamp carriage moves L mm in the same direction. This means that when the FB read pulse
motor is activated, the original can be scanned while a constant distance is maintained between the
original and the center of the lens mounted on the frame. The image of the original on the scanner table
illuminated by the lamp is reflected via mirrors 1, 2, and 3, and is then focused onto the CCD by the lens
in the lens ass’y.
P1203
P1204
Mirror carriage Lamp carriage
Wire-spool pulley
Lens ass’y
FB read pulse motor