Boxoffice-August.02.1976

I 1
THE
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3 Dimensional
Plastic
Letters
6 to 31
The first word in
DURABILITY
DELIVERY
DESIGN
Rapid Change
Letter Co.
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THE
SOURCE
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Acrylic
Flat
Letters
Projection and Sound—
Continued from page 20
ists should watch this because if the lost
motion is too much, they won't be able to
set their shutters to get rid of any streaking.
Lost motion should never be permitted to
be more than 5/16 of an inch. If the ratio
is higher, it is evidence that the mechanism
needs a complete rebuilding job.
Of course the gear train may not be altogether
responsible for lost motion. Often it
is due to worn bearings and other factors,
but mostly it is due to worn gear teeth.
The function of holding the film close
the face of the takeup or feed sprockets is
performed by sprocket teeth idlers (rollers).
The distance of the rollers must be exact if
film is to run smoothly. The distance from
the face of the roller must be approximately
one and one-half times the thickness of the
film. In order to get this exact distance,
place two thicknesses of film on the sprocket
and adjust the roller bracket so that the
roller is firm against the film. There is an
adjusting screw for making this adjustment.
The idler rollers should be adjusted so that
the sprocket teeth will be in the center of
the groove of the roller. Improperly adjusted
idler rollers will cause film damage
if the film jumps the sprocket. If rollers do
not revolve freely, flat places will develop
and rollers will not turn. Use a stiff-bristle
tooth brush for cleaning rollers.
Note: If the idler has been set too close
to the sprocket face, it will pinch the film.
It will then have a tendency to side-weave,
causing the sprocket teeth to climb out of
the sprocket holes in the film. If the roller
is
too far away, the same condition may be
brought about, though for a different reason,
resulting in the loss of one of the film
loops. Proper adjustment of sprocket idlers
is important.
We strongly urge projectionists to make
a thorough daily inspection of the entire path
to
KNEISLEY
of the film through the mechanism between
and including the upper and lower sprockets.
In theatres where first-run films are
used, inspection should be made several
times during the day to make sure no deposit
of the soft emulsion has accumulated
at any point along the film path. A vast
amount of film damage, in the form of
scratches in the emulsion, is inflicted upon
the film every day by these deposits if the
projectionist neglects inspection frequently.
In inspecting the film track, run your
fingertips over each inch of flat space which
the emulsion side of the film contacts, and
examine the rollers and sprockets, too.
Inspect Aperture Plate Tracks
The aperture plate tracks or surfaces of
the tension shoes (whichever the emulsion
side of the film contacts) also should be
carefully inspected when running new
prints. Rollers should be checked to see
there is no buildup of dirt or soft emulsion.
It will pay off if you take time out and
follow our advice when running new prints.
Do not let leaders lay on the floor when
making up programs.
Alignment of the mechanisms and the
soundhead on which it is fastened is very
important because the soundtrack on the
film must run in a perfectly straight line
from the top sprocket down through the
projector to the sound lens beam and not
have any side sway. This means all the
guide-rollers must be in line, running freely,
and free of any dirt accumulations.
If these instructions are followed carefully,
you will obtain a perfect picture and
good sound reproduction from any make of
motion picture projector and sound system.
Unused lengths of film lying around
the booth can he patched onto the front of
reels that arrive without leader or to
leader that is
has,
unprojectionable.
at prices you can afford:
replace
4" to 17
Self-spacing panels that are
Samples on request.
EFFECTIVE
ECONOMICAL
EASY TO USE
For complete
information, please call immediately.
213-747-6546
1319 West 12th Place Los .Angeles, C A 90015
• The "XENEX" LAMPHOUSE. Accommodates 1,000 through 4000
Watt HORIZONTAL Xenon Lamps. WeU constructed, heat insulated
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arc. No obligation.
THE KNEISLEY ELECTRIC COMPANY, P.O. BOX 4692, TOLEDO, OHIO 43620
The MODERN THEATRE SECTION