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4
Mechanical and Electrical
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.
Light blocking Lever
Scan Mirror Position
Sensor (PC2)
Scanning Motor (M1)
Image
Position Sensor (PC1)
Scan Mirror
Shaft
Scan Lever
: Prescan: Scan
The Image
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 |
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Prescan | ON (blocked) | OFF (unblocked) |
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Scan | ON (blocked) | ON (blocked) |
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