Drum Idling Mechanism - Ricoh LDD280 Service Manual

DRUM

Drum Idling Mechanism

Quality Start Mode
In Quality Start mode, the machine enters the drum idling mode before printing.
This ensures that the first print has sufficient ink density even if the machine was
not used for a long time. When the machine is printing (Trial print, 1st print, 2nd
print,.etc.), the drum idling roller is not used.
The user selects Quality Start mode by pressing a key on the operation panel. The
number of idling rotations is fixed at 7. However, a user tool can change this
number (User Tools – System Settings – Mode Settings – No of Idling Rotations:
Quality Start).
NOTE: In Quality Start mode, the drum idling motion starts before printing, when
the Start key is pressed. However, if there is no master on the drum, drum
idling is not done.
Even if the Quality Start mode is active, and there is no master on the drum,
drum idling is skipped although the LED on the operation panel turns on.
When printing for the next original starts, the machine enters drum idling
mode if a large enough master is wrapped around the drum (it will not be
done for an A4 master on an A3 drum).
The drum idling roller [A] puts the ink onto the screen and master before printing.
The idling roller motor [B] turns to press the drum idling roller against the inner
surface of the drum screen [C]. A spring under tension supplies additional force for
this.
The motor turns the cam [D], moving the drum idling roller into contact and away
from the drum screen. The actuator disk [F] interrupts the idling roller HP sensor [E]
when the drum idling roller is in contact with the drum screen.
C262/C265
[B]
[A]
[A]
6-66
[C]
[D]
[E]
[F]
C262D057.WMF
SM