Canon PC720 Service Manual - Page 78

Controlling, Roller

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NMOPERATIONS AND TIMINGIll imuie B. Controlling the Pick-Up Roller 1. Outline The construction of the copier's pick-up roller differs depending on the model. The PC720/740's pick-up roller consists of a cassette pick-up roller and a singlefeeder pick-up roller. The cassette pick-up roller starts to rotate as soon as the pick-up solenoid turns on while the main motor is rotating. The single feeder pick-up roller rotates whenever the main motor is rotating. The PC750/770's pick-up roller consists of a cassette pick-up roller and a multifeeder pick-up roller. The drive to these pick-up rollers is switched by the gear unit, which changes the route of drive transmission; this way, the drive is transmitted to either of the two at a time. 2. Controlling the Cassette Pick-Up Roller The cassette pick-up roller is controlled by the spring clutch, control ring, and pick-up solenoid (SL1). When the solenoid turns on, the pawl moves away from the control ring, thereby allowing the drive of the main motor (M1) to be transmitted to the pick-up roller. When the pick-up roller starts to rotate, copy paper is picked up and sent as far as the registration roller. The registration roller, in turn, serves to control the copy paper so that it matches the leading edge of the image on the photosensitive drum. 3 - 38 COPYRIGHT © 1994 CANON INC. CANON PC72O740(750!T70 REV.O AUG.1994 PRINTED IN JAPAN EMPRIME AU JAPON)

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NM
OPERATIONS
AND
TIMING
Ill
imuie
B.
Controlling
the
Pick
-Up
Roller
1.
Outline
The
construction
of
the
copier's
pick-up
roller
differs
depending
on
the
model.
The
PC720/740's
pick-up roller
consists
of
a
cassette
pick-up roller
and
a
singlefeed-
er
pick-up
roller.
The
cassette
pick-up
roller
starts
to
rotate
as
soon
as
the
pick-up
solenoid
turns
on
while
the
main
motor
is
rotating.
The
single
feeder
pick-up
roller
rotates
whenever
the
main
motor
is
rotating.
The
PC750/770's
pick-up roller
consists
of
a
cassette
pick-up
roller
and
a
multifeeder
pick-up
roller.
The
drive
to
these
pick-up
rollers
is
switched
by
the
gear
unit,
which
changes
the
route
of
drive
transmission;
this
way,
the
drive
is
transmitted
to
either
of
the
two
at
a
time.
2.
Controlling
the
Cassette
Pick
-Up
Roller
The
cassette
pick-up roller
is
controlled
by
the
spring
clutch,
control
ring,
and
pick-up
solenoid
(SL1).
When
the
solenoid
turns
on,
the
pawl
moves
away
from
the
control
ring,
thereby
allowing
the
drive
of
the
main
motor
(M1)
to
be
transmitted
to
the
pick-up
roller.
When
the
pick-up
roller
starts
to
rotate,
copy
paper
is
picked
up
and
sent
as
far
as
the
registration
roller.
The
registration
roller,
in
turn,
serves
to
control
the
copy
paper
so
that
it
matches
the
leading
edge
of
the
image
on
the
photosensitive
drum.
3
-
38
COPYRIGHT
©
1994
CANON
INC.
CANON
PC72O740(750!T70
REV.O
AUG.1994
PRINTED
IN
JAPAN
EMPRIME
AU
JAPON)