Ricoh FT6645 Manual page 50

23 April 1993
2.5 CLEANING
2.5.1 Overview
[C]
[D]
This copier uses the counter blade system for drum cleaning.
The blade [A] is angled against drum rotation. This counter blade system has
the following advantages:
•
Less wearing of the cleaning blade edge.
•
High cleaning efficiency.
Due to the high efficiency of this cleaning system, the pre-cleaning corona
and cleaning bias are not used for this copier.
The cleaning brush [B] is used to support the cleaning blade.
The brush collects toner from the drum surface and scraped by the cleaning
blade. Toner on the cleaning brush is scraped off by the mylar [C] and falls to
the toner collection coil [D]. Toner is transported to the toner collection bottle
by the toner collection coil.
To remove the accumulated toner at the edge of the cleaning blade, the drum
turns in reverse for about 4 mm at the end of every copy job. The
accumulated toner is removed by the cleaning brush by this action.
[A]
[B]
2-25
DRUM UNIT
4 mm