Ricoh LDD250, Service Manual

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PRINTING AND PRESSURE CYLINDER
SM 6-103 C262/C265
Detailed
Des
cription
s
6.9.4 PRINTING PRESSURE MECHANISM
There are two printing pressure springs [D] and two printing pressure arms [B], one
each at front and rear. The pressure cylinder rests on the printing pressure arms.
Normally, the arms are engaged and the printing pressure is not applied.
The printing pressure cam [G] always rotates because of drive from the main motor.
When the high point of the cam reaches the bearing [F] on the printing pressure
arm, it pushes down the arm slightly. At this moment, a small gap is created
between the hook on the arm and the printing pressure release lever [A]. Then, the
printing pressure release solenoid [E] can release the arms. This occurs when the
paper reaches the image transfer area.
When the arms are released, the two printing pressure springs pull the pressure
cylinder up against the drum through the front and rear printing pressure arms,
which turn around the release arm shaft [C].
The printing pressure cam controls the printing pressure application area to prevent
printing pressure from being applied to the master clamper area on the drum. After
the printing pressure arms are released, the printing pressure is applied while the
bearing on the printing pressure arm is riding on the low point of the cam. When it
rides on the high point of the cam, the printing pressure is released to avoid the
master clamper.
C262D099.WMF
[A]
[B]
[C]
[D]
[E]
[F]
[G]
Front
Rear