Printing Pressure Mechanism - Ricoh C217 Service Manual

4.5 PRINTING PRESSURE MECHANISM

[E]
[D]
[H]
[F]
While the machine is not in the printing cycle, the solenoid [A] stays off and
the stoppers [B] lock the brackets [C] to keep the press roller [D] away from
the drum.
When the 1st sheet of paper is fed, the solenoid is energized but the
brackets are still locked by the stoppers due to strong tension of the springs
[E]. When the cam followers [F], mounted on both sides of the press roller
shaft, reach the top of the cams [G] on the front and rear drum flanges, a
small clearance is made between the stoppers and the brackets. They are
then released from the brackets. Printing pressure is applied by tension of
the springs when the cam followers reach the bottom of the cams.
During the printing cycle, the solenoid stays on. However, if paper does not
reach the registration sensor [H] at the proper timing (at this time, the cam
follower is on the top of the cam), the solenoid is de-energized to lock the
brackets.
The printing pressure is released when the cams push down the cam
followers so that the press roller does not contact the master clamper [I].
C217
[I]
[A]
2-16
[G]
[B]
[C]
SM