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31 December 1992
EXPOSURE
The main CPU determines the original length for synchro cutting by counting
the generated pulses after the 1st original transport sensor detects the
leading edge of the original until the original set sensor detects the trailing
edge of the original.
Switching-back
[F]
[G]
[H]
[A]
[E]
[D]
[C]
[I]
[B]
The inserted original activates both the original set [A] and original exit [B]
sensors when the lever [C] is lifted and the entered number of copies is two
or more. The copier CPU then detects that the switching-back mode has
been entered.
In the switching back mode, the original is exposured by passing between the
platen roller and exposure glass. At the appropriate timing after the trailing
edge of the original passes through the 1st original transport sensor [D], the
front original feed [E], platen [F], original registration [G], and rear original
feed [H] rollers turn backwards and the switch back gate [I] is lifted to the up
position. The original is transported to the machines rear side. At the
appropriate timing after the trailing edge of the original passes through the
registration sensor, the front original feed, platen, original registration, and
rear original feed rollers begin turning forward again. The original is exposed
in the exposure section. The copier repeats the switching-back operation until
the entered number of the copies have been made.
After all the copies are made, the original exits the machine.
The copies exit from the lower copy exit way in the switching-back mode
because the rear feeder table is opened.
If the operator attempts inserting an original longer than 610 mm without
lifting up the rear feeder table lever, the original will automatically feed out
after being scanned once only.
2-7
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