Canon CLBR 460ps Service Manual page 110

CHAPTER 2
c. Toner cartridge contact/separation
function
This function brings the developing cylinder
closer to the photosensitive drum by push-
ing the toner cartridge at the time of devel-
opment.
During printing, when it detects that the
specified toner cartridge is in the specified
position (position right before it faces the
photosensitive drum) with the developing
rotary position sensor (PS10), the DC con-
troller rotates the toner cartridge motor
(M5) clockwise for the specified period of
time. (See page 2-51 for developing rotary
position detection.) As a result, the toner
cartridge push cam makes a half turn and
pushes the slider (Figure 2-4-8, 2).
When the toner cartridge is brought into
the position where it faces the photosensi-
tive drum, the slider pushes the toner car-
tridge and the developing cylinder is
brought closer to the photosensitive drum
(Figure 2-4-8, 3).
The DC controller stops the developing
rotary when the toner cartridge is brought
into the position where it faces the photo-
sensitive drum. At the same time, the DC
controller starts development by turning
the M5 counter clockwise to rotate the
developing cylinder.
Clockwise rotation of M5 rotates the
toner cartridge push cam, and counter
clockwise rotation, the developing cylinder.
When the development is completed, M5
starts rotating clockwise. As a result, the
toner cartridge push cam makes a half turn
and the developing cylinder is brought back
to the original position.
The DC controller drives the developing
rotary and repeats the same operation to
make the next toner cartridge face the pho-
tosensitive drum.
2 - 52
Toner cartridge push cam
Developing
rotary shaft
Slider
Toner cartridge
Developing cylinder
Toner cartridge push cam rotates
(M5 CW)
Toner cartridge
push cam stops.
Developing cylinder
rotates (M5 CCW)
Developing rotary stops.
Figure 2-4-8
1
Photosensitive
drum
Developing
rotary rotates
2
3