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4.3.5 Scan Mirror Motion Control
The motion of the Scan Mirror is controlled by the Scan Lever and Shaft
as the Shaft is driven by the Scanning Motor (M1).
The Scan Mirror scans the image of the microfilm at a speed 1/631.6 of
the Scanning Motor (M1).
Once the prescan motion is initiated, the leading edge of the image is
synchronized with that of the paper, and the completion of the scan motion
is detected, by the Scan Start Position Sensor (PC1) which are activated
and deactivated by the cutouts in the light blocking Lever.
Scan Mirror first makes a prescan motion for reading the data before
making the scan motion.
The Image Leading-Edge Position Sensor (PC1) and Scan Mirror Position
Sensor (PC2) detect the cutouts in the light blocking lever.
The starting position for the prescan or scan motion is determined by
particular states of these sensors, blocked (activated) or unblocked
(deactivated), as detailed below.
Scan Motion PC1 PC2
Prescan ON (blocked) OFF (unblocked)
Scan ON (blocked) ON (blocked)
Scan Mirror Position
Sensor (PC2)
Image Leading-Edge
Position Sensor (PC1)
Scan Mirror
Scanning Motor (M1)
Shaft
Scan Lever
Light blocking Lever
: Scan: Prescan