FP 25 E
Issue: 06/2011
81
6 .4 .10 Changing and Lubricating the Felt Disks of the Mechanical Friction
• Remove the knurled nut, the spring, the
friction plate and felt disk on the friction
shaft (arrow).
• Once in a year the felt disk should be put
in a Cardan oil bath. If the felt disk is worn
(surface is hardened) it has to be changed
and oiled.
• Mount the friction again.
• Adjust the friction.
Adjusting the mechanical friction of the spool rack
Friction body
Felt disk
Friction disk
Spring
Knurled nut
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.
• Put a full film spool onto the take-off friction shaft.
• Thread a film and run the projector.
• Stop the projector.
$
The film should not build a loop.
X
NOTE
Z
Depending on frictions (from 600 up to 2000 meters) the film tension has to be
adapted.
Z
The film tension is inversely proportional to reel diameter:
Film tension is less, when reel diameter is large (beginning of take-off friction).
1
5
4
3
2
Repair and Adjustments
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