Ricoh FT4227 Manual page 284

12 February 1992
4.4 3RD SCANNER DRIVE
3rd Scanner
H.P. Sensor
Signal
4.4.1 Drive
The 3rd scanner drive motor (stepper motor) changes the 3rd scanner
position through the pinion gears [A] and the rack gear [B] in accordance with
the selected reproduction ratio to provide the proper optical distance between
the lens and drum surface.
4.4.2 Positioning
The positioning mechanism is similar to that for lens positioning, as shown in
the above positioning chart. The scanner always stops while moving from
right to left (as viewed from the front).
[B]
1
20
1 pulse = 0.06 mm
L H
2-29
[A]
pulses
20
OPTICS
(Initialize)
(Enlarge/Reduce
→ Full Size)
(Full Size
→ Enlarge/Reduce)
(Enlarge/Reduce
→ Enlarge/Reduce)