FP 50 D
Issue: 04/2011
65
6 .4 .11 Adjusting the Mechanical Friction
Friction body
Felt disk
Friction disk
Spring
Knurled nut
Å
Friction shaft
Via the knurled nut the spring tension can be adjusted and therefore the pressure
against the friction disk to the felt disk. Adjusting the frictions is necessary if the felt disk
was replaced.
Adjusting the take-off friction
:
• Put a full film spool onto the take-off friction shaft.
Thread the film and run the projector.
• Stop the projector - the film should not build a loop, otherwise the friction is adjusted
with too small pressure.
• Turn the knurled nut clockwise to increase the pressure onto the felt disk.
Adjusting the take-up friction
:
• The take-up film spool has to be nearly full, then stop the projector - the film should
not build a loop.
• If necessary adjust:
- Right turn of the knurled nut => spring increases the pressure
- Left turn of the knurled nut => spring decreases the pressure
X
NOTE
Z
Depending on the film reel length the film tension has to be adapted.
Z
The film tension is inversely proportional to the reel diameter:
The film tension is less, when the reel diameter is large (beginning of take-off fric-
tion).
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