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 o position.
After the feed sensor is switched
o,
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
501
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