Exit Pawl Drive Mechanism - Ricoh C249 Service Manual

PAPER DELIVERY

6.8.4 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 must 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 out by the drum flange, the exit pawl
closely approaches the drum surface, due to the tension from a 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.
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[B]
[A]
[E]
[G] [F]
[C]
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[D]
SM