8 After a predetermined number of counts, the media reaches the scan area and the image acquisition process is
initiated. While the image acquisition process is executing, the feed sensor is being polled to determine if the trailing
edge of the media has reached the sensor.
9 Once the trailing edge of the scan media has reached the feed sensor, that sensor goes to the off position. After
the feed sensor is switched off, the image acquisition process continues for a predetermined length of time.
10 When the image acquisition process is completed, the trailing edge of the media continues to the reverse point. If
the scan job is simplex, then the media continues to the exit roller (11) and exits the ADF.
11 If the scan job is a duplex scan job, then the feed motor is reversed with a swing gear when the trailing edge of the
media reaches the reverse point. A swing gear moves the diverter gate to the down position.
12 The reversed exit roll (11) pulls the paper back into the ADF. The eject 2 roller then moves the media to the duplex
sensor. When the duplex sensor (9) is actuated, the exit roll stops. Also, the duplex sensor indicates that this is the
second side of the media to be scanned.
13 After actuating the duplex sensor, the eject 2 roll moves the media to the paper feed 1 roll, and the feed sensor.
Like the first pass of the media, the image acquisition process is repeated for the second side of the media.
14 When the trailing edge of the media reaches the reverse point the second time, the swing gear again moves the
diverter gate to the down position and the exit roll reverses. The paper goes back into the ADF unit for a third time.
The paper passes through the paper path, but no imaging occurs. This pass is to turn the paper over to the original
side up. On the third pass of the media trailing edge over the reverse point, the eject two roller does not reverse
and the paper passes out of the ADF.
7016
Appendix C: Theory of operation
467
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