Ricoh A151 Field Service Manual page 347

ORIGINAL FEED
7.3 ORIGINAL FEED-IN MECHANISM
[G]
[C]
[E]
[A]
[D]
[B]
[F]
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The DF motor [A] drives the feed roller [B], the pick-up roller [C], the relay
rollers [D], and the transport belt roller [E] via timing belts and a gear train.
The feed roller and the pick-up roller are controlled by the feed clutch [F], but
the relay rollers and the transport roller are directly driven by the DF motor.


The idler rollers [G] on the feed roller shaft are free from the shaft.
When the key is pressed, the DF motor is energized and the relay rollers
and transport belt roller start turning. 100 milliseconds after the DF motor
starts turning, the pick-up solenoid and the feed clutch are energized. The
pick-up and feed rollers then start turning and carry the original between the
relay rollers and the idler rollers. The pick-up solenoid and the feed clutch are
de-energized when the original's leading edge passes through the
registration sensor.
The DF motor remains energized to deliver the original to the exposure glass
until a certain number of pulses (10 to 25 pulses) after the original's trailing
edge passes through the registration sensor. Then, the DF motor pauses and
reverses for 15 pulses to align the edge of the original with the scale.
To feed the second original, the DF motor starts rotating when the scanner
reaches the return position. (The copier CPU sends the original change
signal to the DF CPU.) At this time, the transport belt starts carrying the first
original on the exposure glass to the exit roller. The timing for when the
pick-up solenoid and the feed clutch are energized for the second original
depends on the length of the first original detected by the registration sensor.
SM 9-9 A202/A203