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OPERATIONS
AND
TIMING
I
G.
Developing Assembly/
Drum
Cleaner
1.
Outlines
The
paddle
inside
the
drum
cleaning
unit
and
also
the developing
cylinder
are rotated
by
the
main
motor.
The amount
of
toner
in
the developing
assembly
is
sensed
by
the black toner
level
sensor
(TS1).
When
the
amount
of
toner
falls
below
the
required
quantity,
the
ADD TONER
indicator
on
the
control
panel
will
flash.
When
the toner
in
the
CT
unit
is
used
up,
the
entire
CT
unit
should
be
replaced.
The
toner
collected
by
the cleaning blade
is
stored
in
the
drum
cleaning
unit:
The
developing
assembly
is
pressed
against the
drum
by
a
bam
that
presses
against the developing
assembly
rail.
(The
cam
is
operated by
the
developing
assembly
release
lever.)
2.
Remaining Toner Sensor
The
black developing
assembly has
a
piezoelectric type
sensor (TS1) which
senses
if
the toner
remaining
in
the
hopper
of
the
developing
assembly
is
above
or
below
the required
level.
When
the
amount
of
toner
in
the
hopper
is
sufficient,
the
sensor
output
is
"1".
When
it
is
below
the specified
level,
the output
is
"0".
The
DC
controller
checks
for
5
seconds
after
copying
is
completed
if
the
TONER
EMPTY
signal
(TEP)
is
being
outputted.
If
the
signal
is
outputted continuously
for
5
seconds,
it
is
regarded as
"TONER
OUT-
First
time".
If
another
TONER EMPTY
signal
is
received
in
the
same
way
after
the next
copying operation
is
completed,
it
is
regarded as
"TONER
OUT-Second
time",
and
the
DC
controller
makes
the
ADD
TONER
indicator
flash.
The
CT
unit for this
copier
does
not
have
a remaining toner
sensor
or
waste
toner
sensor.
3.
Torque
Limiter
There
is
a torque
limiter
in
the
drive
train
between
the
main motor and
the
drum
to
stop the
drum
in
response
to
a
jam
in
the
drum
cleaner.
Drum
cleaning
unit
Pressed
<3=v
>
Reteased
Developing
assembly
positioning
cam
Stirrer
Developing
assembly
rail
unit
Figure 3-27
COPYRIGHT©
1992
CANON
INC.
CANON
NP-1550
REV.1
SEPT. 1992
PRINTED
IN
JAPAN
(IMPHIME
AU
JAPON)
3-27
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