Separation And Feed Mechanism - Ricoh A172 Service Manual

5. SEPARATION AND FEED MECHANISM

[A]
[E]
[F]
[D]
[B]
[F]
[C]
Drive from the feed-in motor [A] is transmitted to the pick-up [B], feed [C],
and pull-out rollers [D], through the feed-in clutch [E], as shown. The feed
roller and the friction belts [F] are used to feed and separate the originals.
Original feed starts when the feed roller starts turning to advance the bottom
original of the stack. The feed roller moves the original past the separation
belt because the driving force of the feed roller is greater than the resistance
of the friction belt. The friction belt prevents multiple feeds because the
resistance of the friction belt is greater than the friction between original
sheets. At this time, the feed-in motor rotates slowly to ensure proper feed
and separation of the original.
When the leading edge of the original activates registration sensor-2 [G], the
feed-in clutch turns off and the motor rotates more quickly. To reduce
mechanical load, only the pull-out rollers are driven to feed the original to the
exposure glass.
To prepare the next original, it is separated in the same manner as explained
above, and stopped when the leading edge is detected by the registration
sensor-2 [G]. When it is time to feed this sheet to the exposure glass, the
feed-in motor rotates at high speed.
A172/A199 7-8 SM