Canon PC720 Service Manual - Page 93

Tension, tension

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Mig§ OPERATIONS AND TIMING b. Operation The tension roller consists of an idler roller and a friction roller. The idler roller rotates in relation to the movement of the fixing film; and the friction roller, which is along the same axis as the idler roller, rotates independently of the idler roller. A tension wire is hooked on the peripheral direction of the friction roller shaft, taking in the tension wire for a length corresponding to the rotation force of the friction roller so as to lower the front of the tension roller. The tension of the tension wire increases or decreases in proportion to the rotation force of the fiction roller. The rotation force of the friction roller increases or decreases in proportion to the area of the fixing film that comes in contact with the friction roller. e6' ' Idler roller Friction roller (front) \\\* Fixing film coverage Tension wire Balance spring Figure 3-416 Stronger Tension on tension wire Weaker Rotation power of friction roller Smaller Larger Figure 3-417 Stronger 0 4-.) O 2 Cc 0c TTI c'3c 4= Weaker Coverage of fixing film Smaller Larger Figure 3-418 When the fixing film becomes displaced toward the rear, the area of the fixing film coming into contact with the fixing film will decrease, thereby decreasing the rotation force of the fixing roller. When the rotation force of the friction roller decreases, the tension of the tension wire decreases, thereby causing the balance spring to lift the front of the tension roller by way of the swing arm. COPYRIGHT 1994 CANONINC. CANON POT20174075EITTOREV.OAUG.1994 PRINTEDIN JAPAN(mPRimt AU JAPON) 3 - 53

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OPERATIONS
AND
TIMING
Mig§
b.
Operation
The
tension
roller
consists
of
an
idler
roller
and
a
friction
roller.
The
idler
roller
rotates
in
relation
to
the
movement
of
the
fix-
ing
film;
and
the
friction
roller,
which
is
along
the
same
axis
as
the
idler
roller,
rotates
independently
of
the
idler
roller.
A
tension
wire
is
hooked
on
the
peripheral
direction
of
the
friction
roller
shaft,
taking
in
the
tension
wire
for
a
length
corresponding
to
the
rota-
tion
force
of
the
friction
roller
so
as
to
lower
the
front
of
the
tension
roller.
The
tension
of
the
tension
wire
increas-
es
or
decreases
in
proportion
to
the
rotation
force
of
the
fiction
roller.
The
rotation
force
of
the
friction
roller
increases
or
decreases
in
proportion
to
the
area
of
the
fixing
film
that
comes
in
contact
with
the
friction
roller.
(front)
e'
6
‘
Idler
roller
Friction
roller
\\
\
*
Fixing
film
coverage
Tension
wire
Balance
spring
Figure
3-416
Stronger
Tension
on
tension
wire
Weaker
Rotation
power
of
friction
roller
Smaller
Larger
Stronger
0
4
-
.)
O
2
C
c
c
0
TTI
'3
4
=
cc
Weaker
Figure
3-417
Coverage
of
fixing
film
Smaller
Larger
Figure
3-418
When
the
fixing
film
becomes
displaced
toward
the
rear,
the
area
of
the
fixing
film
coming
into
contact
with
the
fixing
film
will
decrease,
thereby
decreasing
the
rotation
force
of
the
fixing
roller.
When
the
rotation
force
of
the
friction
roller
decreases,
the
ten-
sion
of
the
tension
wire
decreases,
thereby
causing
the
balance
spring
to
lift
the
front
of
the
tension
roller
by
way
of
the
swing
arm.
COPYRIGHT
1994
CANON
INC.
CANON POT20174075EITTO
REV.O
AUG.1994
PRINTED
IN
JAPAN
(mPRimt
AU
JAPON)
3
-
53