Ricoh C249, Service Manual

Page: 385 / 486

DRUM
SM 6-31 C264
C26
4
6.6 DRUM
6.6.1 OVERVIEW
•
The drum idling roller [C] ensures that the first print has sufficient ink density if
the machine was not used for a long time.
Procedure
Ink is supplied inside the drum, through the drum shaft.
↓
The ink roller [A] and the doctor roller [B] spread the ink evenly on the screens.
The drum idling roller [C] supplies ink to the screens and master before and after
printing.
↓
Ink passes through the metal screen [D].
↓
Ink passes through the cloth screen [E].
↓
Ink passes through the holes in the master that were made by the thermal head.
↓
Ink reaches the paper.
NOTE: 1) The drum is driven by the main motor and turns only clockwise.
2) The main motor speed and the drum stop positions are controlled by
monitoring the motor encoder.
3) The ink pump, which is outside the drum, supplies ink from the ink
cartridge to the drum through the drum shaft.
[A]
[B]
[C]
[D]
[E]