Advertisement
I
COPYING
PROCESS
I
I.
Step 7
Fixing
Cleaning
roller
Upper
fixing roller
Tungsten-halogen
heater
(900W)
Lower
fixing roller
Toner
Copy
paper
Figure 2-13
In
this
step,
the
copy paper
is
pressed
between two
heated
rollers
to
make
the toner
image
permanent.
To prevent
the
copy paper
from
wrapping
around
the
roller
and
toner
offsetting
(adhesion
of
toner
to
the
roller
and
transfer
of
the toner
to
the next copy), the surface
of
the
upper
fixing
roller
is
cleaned
with the cleaning
roller.
II.
AUXILIARY
PROCESSES
A.
Blank
Exposure
Blank
exposure
is
the
process
of
shining
light
onto
is
simply
the
removal
of
the
drum
surface
potential
in
the
non-image
areas
resulting
from
REDUCTION
copying
and
using
some
cassette sizes (paper
sizes).
The
light for
this
is
produced by
the precondition-
ing
lamp and
is
reflected
onto the
drum
by
a
reflector.
In
the
non-image
area on
the
drum
between
successive sheets
of
copy
paper,
the
grid
bias
of
the primary
corona
is
reduced
to
prevent
adhesion
of
toner.
For
these;
areas, there
is
no
blank
exposure
for
removal
of
the surface
charges.
B.
Ozone
Filter
A
catalytic
ozone
filter
in
the
exhaust
fan
prevents
ozone
(generated
by
the
coronas)
from escaping
to
the
atmosphere by
con-
verting
the
ozone
to
oxygen.
J.
Step
8
Drum
Cleaning
Cleaning blade
Paddle
Toner
catcher
Figure 2-14
This step
prepares
the
drum
surface
for
the next
copying
operation.
Any
residual
toner
scraped
off
the
drum
by
the cleaning
blade
and
picked
up by
the toner catcher.
It
is
then
pushed
to
the
back
by
the paddle.
COPYRIGHT©
1992
CANON
INC
CANON
NP-1 550
REV.O
JAN.
1992
PRINTED
IN
JAPAN (IMPRIMEAUJAPON)
2-5
Advertisement
