Ricoh Robin Service Manual page 71

PAPER FEED AND REGISTRATION 24 June 1994
9.6 PAPER REGISTRATION
[C]
[F]
[D]
[E]
[B]
[A]
[G]
[F]
[I]
[H]
Main motor rotation is transmitted to the timing belt [A] through a series of
gears. The timing belt rotates the relay gear [B] and then the registration
roller clutch gear [C]. When the registration clutch [D] is energized, the
rotation of the clutch gear is transmitted to the lower registration roller [E].
The registration sensor [F], which is positioned just before the registration
rollers [G], controls the relay roller clutch stop timing. The relay roller clutch
stays on for 180 milliseconds after the leading edge of the paper actuates the
registration sensor. The CPU then turns off the relay roller clutch. This delay
allows time for the paper to press against the registration rollers and buckle
slightly to correct skew.
The CPU energizes the registration clutch and re-energizes the relay roller
clutch at the proper time to align the paper with the image on the drum. The
registration, 1st [H] and 2nd [I] relay rollers feed the paper to the image
transfer section.
The registration sensor is also used for paper misfeed detection.
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