Ricoh FT3320 Service Training Manual page 63

- Cam Rotation Mechanism -
The paper feed drive gear [A] turns while the main motor is on. However,
cam
the paper feed
is off because the clutch pawl [C] is engaged with the sleeve of the paper
feed clutch [D], which is a spring clutch. Also
cam is held by the stopper [F], which keeps the pawl from engaging with the
ratchet.
When the paper feed solenoid energizes, it pulls the clutch pawl away from
the sleeve of the paper feed clutch, allowing the clutch to engage. Rotation
then passes to the feed and pick-up rollers. As the clutch pawl is pulled
away from the clutch sleeve, it also pulls the stopper away from the ratchet
pawl, allowing the ratchet pawl to engage with the ratchet. The paper feed
cam then starts
turning.
The paper feed cam has two cam surfaces: a lift cam [G] and a step cam
[H]. As the cam
down and to bring the pick-up roller into contact with the stack of paper.
up
At the same time the step cam portion pushes the stopper out so that it is
no longer held away from the rim of the cam by the clutch pawl. When the
cam has finished one rotation the stopper disengages the ratchet pawl from
the ratchet, causing the cam to stop turning. However, the feed roller con-
tinues to turn until the paper feed solenoid turns off.
[B] does not turn while the paper
turns, the lift cam portion moves the pick-up
feed solenoid [SOL1 ]
the ratchet pawl [E] on the
j
roller lever [I]