Scanner Drive - Ricoh FT5540 Service Manual

31 August 1989

3.3 SCANNER DRIVE

This model uses a dc servomotor [A] to drive the first [B] and second [C] scanners.
This first scanner is attached to the scanner drive wire by the wire clamp [D]. The second
scanner is connected to the scanner drive wire by a movable pulley [E] (the second scanner
pulley).
The second scanner pulley moves the second scanner at half the velocity of the first scanner.
This maintains the focal distance between the original and the lens during scanning. This
relationship can be expressed as follows:
V1r = 2(V2r) = VD/r
where
The first scanner wire clamp also actuates the home position sensor. The CPU on the optics
board controls both the registration and return timing.
r: Reproduction
First Scanner Velocity (when the Reproduction ratio is "r")
V1r:
V2r: Second Scanner Velocity (when the Reproduction ratio is "r")
Drum Peripheral Velocity (300 mm/s)
VD:
2-10