FP 25 E
Issue: 06/2011
35
3 .8 .1 Lever Arm
The rotary speed (revolution) of the friction drive depends on the reel diameter.
The current diameter is calculated by the position of the lever arm.
At a film break the lever arm falls to the stop position and activates the film break
switch - the friction drive will be stopped.
lever arm
A
stop position
A
-
B
working position range
X
NOTE
Z
At projection operation the film must be threaded via both lever arms.
Z
At rewind, make-up and tear-down operation the film must be threaded via the
lever arm of the take-off friction (lower/rear side). The other lever arm stays free.
Z
See also threading instruction in chapter 5.2.
Procedure
During operation - the film spools turn - the lever arm(s)
will be hold in the range of
the working position
A
-
B
:
$
E. g. the diameter of the take-off film reel gets smaller and smaller therefore the
lever arm moves out of the range of the working position.
$
The excursion of the lever arm will be registered by the control unit. The control unit
calculates the correct rotary speed for the current reel diameter and transmits the
value to the corresponding friction drive.
$
The friction drive will be adapted and the lever arm returns to the working position
range.
Lever arm moves to stop position
A
:
$
The film break switch will be activated.
$
The friction drive will be decelerated until complete stop.
• To activate the friction drive again, the lever arm must be moved out of its stop
position, therefore manually turn the corresponding film spool (tense film).
ATTENTION
Do not hinder the excursion of a lever arm.
A
B
1
Components - Spool Tower
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