Boxoffice-November.24.1951

. . And
. . buy
The catalogs contain much use-
facturers.
ful information for projectionists interested
in constructing sound equipment of
their own.
A "rock-steady" picture can be obtained
only when the intermittent movement is
good repair. Needless to say that "undercut"
intermittent sprocket will cause the
picture to jump. A worn cam or starwheel
will cause unsteady picture. A sprung starwheel
will cause picture to jump very
badly.
CARE OF POWERS PROJECTORS
There are still quite a few Powers projectors
used so let me give you a few tips
on repairing this type of movement. First,
if parts are worn very much, it is best to
install parts needed to secure a good adjustment
and steady picture as well as a
quiet running intermittent movement.
Under-cut sprocket should always be replaced
immediately. If cam and pincross
are in fair condition but noisy, a new set of
666-C rollers can be installed and this will
correct the trouble, but sometimes it is
necessary to replace both the cam and pincross
in order to secure a good job. If the
movement leaks oil, take cover off intermittent
case and clean and install new
gasket; check time cam shaft where it
goes through the case and if much play
here, oversize shaft can be purchased, and
the bearing reamed out slightly with a
straight-end reamer. If worn too much it
will be necesasry to have a machinist install
new bearings in order to correct the
trouble.
Before we go any further, let me say here
that it is very Important to remove endplay
in the sprocket so that you will not
have "side-play" in the picture on the
screen. A little will do no harm, but it is
better not to have any. Some movements
have a collar at end of starwheel for this
adjustment. Sometimes this is caused when
the holes in the intermittent sprocket become
worn and it is necessary to install
new pins. From your local supply house
or manufacturer you can secure a small
reamer and ream the holes out slightly and
install new pins. This will correct the
trouble.
ADJUSTMENT OF SIMPLEX BB
in
wheel and cam gears fit too tight, it may
be necesasry to "grind" them a little until
they turn freely. Use Arkansas Powder
mixed with oil for this job. Mark parts so
they will go back in same places after you
have washed them good with gasoline.
Every speck of grinding powder must be
washed out of the case and parts.
Spare intermittent should be kept on
hand so you can take your time repairing,
or so you can send it into your local supply
house. The "heart" of the projector
is the intermittent!
I strongly recommend that you send
your intermittent in to your dealer as he
has the tools, parts and knowledge to do
a good job, but for those who want to do
their own repairing or Install sprocket,
the above data will help them to do a better
Job and understand better what to
do.
A dark spot on the screen may be removed
by a mirror adustment, either up
and down or from side to side. If this adjustment
removes the spot from the center
of the screen and doesn't affect the Image
at the center, the mirror and crater positioning
are correct.
If the reflector adjustment removes the
dark spot from the screen center and replaces
it with a dark border or corners on
the screen, the entire lamp Is too far
back. Push It forward to reduce distance
from aperture to reflector and Increase
the span of the rays at the aperture.
Quality-Performance- Economy
Complete
tine
The
Barontyne
includes;
Royol Soundmaster
single and double
channel amplifiers
Royal Soundmaster
Saundheods
Ba'lonfyne Model
"BW" Projectors
Soundmaster Bases
Lightmoster Model
4570 Projection
Arc Lamps
Lightmoster Rectifiers
in complete ronge
of sizes
Motor Generotors
Two-Woy Horn
Systems
Let us next take up the adjustment of
Simplex BB movements. As to under-cut
sprocket, install new. If cam or starwheel
are badly worn, install new if you want a
steady picture. If the movement needs adjusting,
first loosen but do not remove the
six screws which hold the cover of the
casing. It is taken for granted you have
removed the intermittent from mechanism
and placed it so the oil spout is straight
up. By loosening these six screws the
weight of the loosened cover will push the
star against the cam by gravity. This will
be the correct adjustment. Now carefully
tighten each screw just a little at a time
until all six are tight. If you want a quiet
running movement, the cam pin must fit
the slot of the starwheel snugly; the shafts
must fit snugly but not too tight. If star-
BOXOFFICE
THE COMPLETE LINE OF SOUND AND PROJECTION
EQUIPMENT FOR INDOOR AND OUTDOOR THEATRES
Regardless of what you pay you can buy no finer equipment
.
you can buy it now on easy budget terms.
Simply choose the equipment you need it a piece
.
at a time, adding whatever you want WHEN you want it.
Start acquiring the equipment you need, now, wi hout a
financial strain on your operating budget. Write for
details on this easy budget plan.
Complete sound
systems
Magazines, screens
and a complete line of
accessories
Everything for the
drive-in theotre including
Batlantyne's
famous in -a- cor
speaker . . . the finest
you con buy regardless
of cost.
THE BALLANTYNE CO., 1707 DAVENPORT ST., OMAHA, NEBRASKA
71