Operation - Ricoh DF56 Service Manual

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COMBINE 2 ORIGINALS MODE
10 July 1992
13.2

OPERATION

[A]
[Fig. 1]
3 mm
[Fig. 2]
The original transport speed in the combine 2 originals mode is 203
mm/second, while the speed in DF, SADF, and ARDF modes is 810
mm/second. This is to accurately control the 2 originals' stop position on the
exposure glass. The originals exchange speed is about 4 seconds.
The DF operation in the combine 2 originals mode is as follows:
[Figure 1]
100 milliseconds after the registration sensor [A] detects the trailing edge of
the first original, the feed-in clutch turns on again to feed the second original.
[Figure 2]
When the registration sensor detects the leading edge of the second original,
the feed-in clutch turns off and the DF CPU starts counting the encoder
pulses of the belt drive motor. At the proper timing, the belt drive motor turns
off to place the leading edge of the second original 3 mm (0.12") away from
the left scale edge.
4

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