12
Kodak Super-40
Shutter
The KODAK PAGEANT Arc Projector is
equipped with the SUPER-40 Shutter
(Figure 10), which provides 40 per
cent more screen illumination in the
2-blade position than it does in the
3-blade position.
Action of the SuPER-40 Shutter
At the 3-blade position (for silent
speed), there are a minimum of
forty-eight light interruptions per
second. This position is maintained
by spring tension. The tension coun
teracts the centrifugal force exerted
by a weight that is linked to the two
movable blades.
When the speed selector is moved
to SOUND, the additional centrifugal
force that results from the faster
speed of the shutter overcomes the
spring tension. The movable blades
rotate on their axis and overlap in a
position opposite the fixed blade. Now
the shutter will operate in the 2-blade
position, giving the same light inter
ruptions per second, but with 40 per
cent more screen illumination.
Sound Speed-If
the SUPER-40 Shutter
in the 2-blade position provides too
much illumination, it can be locked in
the 3-blade position. When the projec
tor is operated at sound speed, the
shutter will automatically shift (if
not locked) from the 3-blade position
to e 2-blade position.
ilent Speed-The
SUPER-40 Shutter
will remain in the 3-blade position if
the projector is started in silent
speed. If the projector is started in
sound speed and then shifted to silent
speed, the shutter cannot return to
the 3-blade position unless the motor
is stopped momentarily.
FIGURE 10
SUPER-40 Shutter In 2-Blade Position
SUPER-40 Shutter in 3-Blade Position
To Lock the SuPER-40 Shutter
in
the 3-Blade Position:
Stop the projector; disconnect the
power cord; loosen the SCREW on the
LAMPHOUSE COVER (Figure 11); re
move the cover. Turn the trial thread
knob until the SHUTTER LOCK (Figure
12) is visible. Hold the trial thread
knob to prevent rotation of the shut
ter and, using a screwdriver or simi
lar object, push the shutter lock
down
as far as it will go. Replace the lamp
house cover and tighten the screw. To
unlock the shutter, proceed as above,
except that the shutter lock must be
moved
up
as far as it will go.
LAMPHOUSE
COVER
FIGURE 11
