PREFACE
THE PRO-35 is a modern mechanism, streamlined and designed for a long life of unequalled
performance. The projector is designed to meet or exceed standards for film speed, picture stability, and film
protection. Heavy-duty drive components insure reliable operation for extended periods of continuous duty.
THE MAIN FRAME is designed for ruggedness and simplicity. All driving gears are con-
tained within the main frame and submerged in oil. No gears are visible on the drive side of the projector. The
mechanism has been designed with roominess for ease of threading, operation, service, and cleaning. The
projector, designed for long life, carries a one year warranty on the mechanism, including all film-bearing parts.
As a result of the modern design, film-bearing parts can be removed and replaced with great ease.
HIGHEST EFFICIENCY is obtained by the unique conical shutter positioned close to the
aperture for maximum light efficiency. Aperture plates are easily replaced for any screen ratio. The lens holder
is designed to accept a four-inch lens, and reducers are supplied to accommodate 2-25/32 inch (72mm) lenses.
The lens barrel allows complete prefocusing facilities. The lens mount is of heavy, cast iron construction to add
weight and bulk for positive anchorage and elimination of any fragility. The lens carrier is mounted to its base
with a double V lens slide with a microthread lens focus adjustment. A unique picture changeover system is
a built-in part of the projector.
THE INTERMITTENT MOVEMENT is of heavy construction with a large cam and star.
The starwheel is webbed for additional strength. Unlike commonly used drives, the fractional-horsepower
motor drives the intermittent, which in turn drives the projector and soundhead. Framing is accomplished by
moving the intermittent sprocket, independent of the shutter, by means of a Delrin spiral coupling. With this
method. no other compensation is needed when the picture is framed, and shutter adjustment controls are not
necessary.
THE FILM GATE AND TRAP are unique. They are made as an assembly and can be re-
moved as a single unit, thereby eliminating the repeated adjustments required to keep the gate aligned with the
trap. Although the film gate is a part of the trap assembly, the gate pressure pads is easily removed for cleaning
by means of one screw. The film shoes on the gate pressure pad can be adjusted for tension while film is in
motion. The opening and closing mechanism for the film gate incorporates a cam adjustment, allowing adjust-
ment of the gate and trap spacing while the machine is running.
AN OIL DRAIN is easily accessible on the front of the projector main frame to permit draining
the projector oil as a service routine. The oil level is indicated by a ring on the clear oil fill tube visible from the
off-operator side of the mechanism. A can of Ballantyne Projector Oil is supplied with the projector; use
only
genuine Ballantyne Projector Oil (Part No. 21-98126) in the mechanism.
IN ORDER that all the many features of the Pro-35 may be fully realized, it is recommended
that the following instructions be studied carefully to acquaint the operator thoroughly with the mechanism.
IF AT ANY TIME you have a question, or desire aid in securing anticipated results, write
directly to STRONG INTERNATIONAL, 4350 McKinley Street, Omaha, Nebraska 68112.
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Summary of Contents for Ballantyne PRO-35
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