Ricoh C231 - Exit Pawl Drive Mechanism

PAPER DELIVERY
2-46
C231/C237/C238 SM
2.7.4 EXIT PAWL DRIVE MECHANISM
During printing, the distance
between the exit pawl [A] and
the drum is very small to
prevent paper wrap jams.
However, when the master
clamper [B] approaches the exit
pawl (as the drum turns), the
pawl has to be moved away
from the drum to prevent it from
being damaged by the master
clamper. This is controlled by
the front drum flange [C], which
is cam-shaped, and the cam
follower [E] on the exit pawl
shaft.
When the cam follower is not
pushed away by the drum
flange, the exit pawl is
positioned close to the drum
surface, by the tension of
spring [G].
As the master clamper
approaches the exit pawl, the
high point of the drum flange
cam [C] moves into contact
with the cam follower [E]
pushing it down. This moves
the cam follower arm [F]
downwards. The pawl shaft
turns clockwise to move the pawl away from the drum.
When printing finishes and the
printing pressure is released, the
cam follower arm [F] is engaged by
the printing pressure release arm
[D] and held in the lower position.
Therefore, after printing finishes,
the cam follower is out of contact
with the cam, and the exit pawl
moves away from the drum to its
normal position.
C231D561.WMF
C231D562.WMF
[A]
[B]
[C]
[D]
[E]
[F]
[G]
[D]
[F]