Drum Cleaning - Ricoh B234 Service Manual

DRUM UNIT
6.11.4

DRUM CLEANING

Overview
[D]
[B]
[F]
[A]
[E]
[C]
B234D866A.WMF
This copier has two drum cleaning blades: a main drum cleaning blade [A] and a
2nd cleaning blade [B].
Main Cleaning Blade
The main cleaning blade is a counter blade angled against the direction of drum
rotation. The counter blade system has the following advantages:
• Less wearing of the cleaning blade edge
• High cleaning efficiency
The cleaning brush [C] removes toner from the drum surface. Any remaining toner
is scraped off by the cleaning blade. The cleaning brush rotates counter-clockwise,
not against the rotation direction of the drum. This reduces wear on the surface of
the drum.
Toner on the cleaning brush is scraped off by the scraper [D] and falls onto the
toner collection coil [E]. The coil transports the toner to back to the toner entrance
tank in the toner bank unit for recycling.
The agitator [F] agitates the toner to prevent clumping in the toner returned to the
toner entrance tank.
To remove any accumulated toner at the edge of the cleaning blade, the drum
turns in reverse for about 40 ms at the end of every copy job. This is also done
every 30 minutes during long copy jobs. If any accumulated toner is deposited on
the drum, it is removed by the cleaning brush. For more, refer to SP2506 002
(Cleaning Interval – Multiple Copy - Interval) in Section "5. Service Tables".
SM 6-69 B234/B235/B236/D101/D102/D103