Fig. 4-52 Drum Cleaner Assembly Main Components (From Copier Front) - Canon NP-70 Service Manual

4-44
NP -70
4.7 DRUM CLEANER ASSEMBLY
4.7-1 OUTLINE OF ASSEMBLY OPERATION
The Drum Cleaner Assembly is located above, and to the right of, the drum and is used for wip-
ing the remaining developer off the drum prior to each copy operation. The main portions of
the Drum Cleaner Assembly are the skirt blade portion, the cleaner blade portion, the liquid
stoppers, and the frame portion which supports them. The skirt blade wipes off coarse parti-
cles (such as paper fibers or lumps of toner), while the cleaner blade completely cleans up the
remainder.
Due to drum contact, the following are required for proper assembly operation.
a) The skirt blade and the cleaner blade should be pressed against the sensitive drum with
proper and constant pressure so that they can clean the drum completely and correctly.
b) The skirt blade and the cleaner blade must not have any imperfections on the edge touch-
ing the drum surface.
c) During the rotation of the drum, there should be no harsh noises caused by the blades
rubbing against the drum.
d) No developer should be present on the drum after the blades have performed their clean-
ing function.
4.7-2 ASSEMBLY MAIN COMPONENTS
Pressure Adjust-
ment Plate
Locking
Arm Knob
Locking Arm
Skirt Blade Knob
~ ~~~
r __ ~~
~~
~,, - ~~ ~~
~„
~ ,
`~
Skirt Bla
Cleaner Blade
Liquid Stopper
Plate
Pivot Shaft
Fig. 4-52 Drum Cleaner Assembly Main Components (from Copier Front)
Blade
Holder
Knob
Second Printing,lune, 1974 © CANON INC.