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BASIC OPERATION
12 February 1992
5.
BASIC OPERATION
1. One-sided Original Feed
When an original is inserted into the DF, the Insert Original indicator light
goes out and the DF informs the main system's CPU that originals have been
set.
When the Start key is pressed, the main system's CPU sends the feed-in
signal to the DF. On receipt of this signal, the DF energizes the pick-up
solenoid, the feed-in clutch, and the belt drive motor in order to feed-in the
bottom sheet of the original stack onto the exposure glass. The pick-up
solenoid and the feed-in clutch remain energized until the original's leading
edge reaches the DF registration sensor. The belt drive motor turns off 2,088
encoder pulses after the original's leading edge passes the DF registration
sensor.
While feeding the original, the DF registration sensor and the original width
sensor check the original size.
Shortly before the belt drive motor turns off, the DF CPU sends the copy start
signal to the main system. On receipt of the signal, the main system's CPU
starts the copy cycle.
When the scanner reaches to the return position, the main system's CPU
sends the feed-out and the feed-in signals to the DF CPU in order to
exchange the original with the next original.
When the scanner comes to the return position after scanning the last
original, the main system's CPU only sends the feed-out signal in order to
feed-out the last original.
2. Two-sided Original Feed
Unlike one-sided original feed, the back side of the original must be copied
first to keep the originals and copies in the correct order.
During original feed-in, the sequence is the same as for one-sided feed;
however, the DF CPU also energizes the feed-out motor and the inverter
solenoid a short time after the original's leading edge has passed the DF
registration sensor. The belt drive motor continues to feed the original until
85 milliseconds after the original leading's edge passes the feed-out sensor.
At this point the inverter mechanism inverts the original, in preparation for
copying the back side. Then the belt drive motor reverses and the original is
fed towards the original stopper and is stopped at the correct position on the
exposure glass. The DF CPU sends the copy start signal a short time after
the original's trailing edge has passed the feed-out sensor.
6
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