Canon PC720 Service Manual - Page 81

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UOPERATIONS AND TIMINGFA 4. Controlling the Multifeeder Pick-Up Roller The multifeeder pick-up roller is con- trolled by the spring clutch, control ring, pickup solenoid (SL1), gear unit, lift arm, and multifeeder pick-up solenoid (SL4). When the multifeeder pick-up solenoid (SL4) turns on, the drive of the main motor (M1) is transmitted to the cam gear. When the cam gear starts to rotate, the lifter which is in contact with the cam gear starts to lift the gear unit and, at the same time, lowers the paper guide plate. The cam gear is designed to stop at a specific location. When the solenoid (SL1) turns on while the mechanism is in this spatial relationship, the pawl moves away from the control ring, allowing the drive of the main motor (M1) to be transmitted to the multifeeder pick-up roller. When the multifeeder pick-up roller rotates, copy paper is picked up and sent as far as the registration roller. The registration roller in turn controls the copy paper so that its leading edge matches the leading edge of the image on the photosensitive drum. DC controller PCB rLnL 2 SL1 Cam SL4 gear *TP MI Copy paper Spring clutch Lifter Control ring Pawl Gear unit Multifeeder pick-up roller Paper guide plate Figure 3-404 COPYRIGHT © 1994 CANON INC. CANON PC120.740750i7i0 REV.O AUG.1994 PRINTED INJAPAN ompRimt AUJAPON) 3 - 41

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UOPERATIONS
AND
TIMING
FA
4.
Controlling
the
Multifeeder
Pick
-Up
Roller
The
multifeeder
pick-up
roller
is
con-
trolled
by
the
spring
clutch,
control
ring,
pick-
up
solenoid
(SL1),
gear
unit,
lift
arm,
and
multifeeder
pick-up
solenoid
(SL4).
When
the
multifeeder
pick-up
solenoid
(SL4)
turns
on,
the
drive
of
the
main
motor
(M1)
is
transmitted
to
the
cam
gear.
When
the
cam
gear
starts
to
rotate,
the
lifter
which
is
in
contact
with
the
cam
gear
starts
to
lift
the
gear
unit
and,
at
the
same
time,
lowers
the
paper
guide
plate.
The
cam
gear
is
designed
to
stop
at
a
specific
location.
DC
controller
PCB
MI
Cam
SL4
gear
*TP
Spring
clutch
rn
LL
2
SL1
Lifter
Control
ring
Pawl
Gear
unit
When
the
solenoid
(SL1)
turns
on
while
the
mechanism
is
in
this
spatial
relationship,
the
pawl
moves
away
from
the
control
ring,
allowing
the
drive
of
the
main
motor
(M1)
to
be
transmitted
to
the
multifeeder
pick-up
roller.
When
the
multifeeder
pick-up
roller
rotates,
copy
paper
is
picked
up
and
sent
as
far
as
the
registration
roller.
The
registration
roller
in
turn
controls
the
copy
paper
so
that
its
leading edge
matches
the
leading
edge
of
the
image
on
the
photosensitive
drum.
Figure
3-404
Copy
paper
Multifeeder
pick-up
roller
Paper
guide
plate
COPYRIGHT
©
1994
CANON
INC.
CANON
PC120.740750i7i0
REV.O
AUG.1994
PRINTED
INJAPAN
ompRimt
AUJAPON)
3
-
41