Canon NP6012 Service Manual page 102

SE Sry OPE ATIONS 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 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 peripherat 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
torce 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.
<
ae
Sy Idler roller
aC
ree roller a
(front) %
~ »
Ne hly film
coverage
ve
: Tension wire
Balance spring
Figure 3-413
COPYRIGHT © 1995 CANONINC.
Stronger
Tension on tension wire
=
oO >
x
oO
a4
Rotation power of friction roller
Smaller Larger
Figure 3-414
Stronger
Rotation force of
friction roller
=
o »
ze
o &
Coverage of fixing film
Smaller Larger
Figure 3-415
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.
CANON NP6012/ NP6O12F/NP6212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-57