Boxoffice-October.01.1955

screw to catch the oil and prevent it from
running down into the sound reproducer
When replacing the druui screw be sure the
steel, fiber and copper washers are placed
In that order on the screw to prevent any
oil leakage.
Caution—Oil should not be added to the
intermittent while the projector is in operation—except
in an extreme emergency.
The intermittent cam acts as a splash distributor
supplying fresh oil constantly to
the cam. starwheel and bearings. Therefore,
there may be no indication of oil level
showing on the gauge while the projector is
operating. The intermittent movement case
should be kept clean and free of any dirt
accumulation.
WEEKLY CHECK OF
OIL
Once a week the oil level should be
checked in the inter/nitterit movement.
Briefly, the Century projection mechanism
has only five rotating shafts and nine
gears, plus the intermittent movement. The
reader will readily understand this means
ease of operation, quieter running and
longer life. The driving shafts are rotated
in sealed-for-life ball bearings which do
not require any special lubricating attention
t
don't oil the ball bearingsK
The upper and lower film sprockets are
hardened and ground to perfect concentricity
and manufactured to approved
standard and diameter. Likewise, the intermittent
parts are hardened for long wear.
The film trap and gate are mechanically
turdy, and all the wearing parts are
lardened and made of the finest steel to
^arantee smooth film travel. The film
rap shoes, studio guides, and the lateral
;uide roller assembly, are designed to guide
he film correctly and insure against side-
Modern Projectors Are Unit-Constructed
To Make for Easier Maintenance
The trend, the past several years, in
modern projector coiustrtiction is to
build all the major components in
units, thereby making removal for inspection,
cleaning and replacement of
parts easy and toithout hatying to disassemble
the entire mechanism to replace
one particular part. To provide for
accurate alignment of all the units,
doivel pins arc provided and the part has
to go back into place correctly: this
method insures all the gears tvill be In
perfect alignmejit, and no mistakes can
be made in reassembling any of the
components.
Intermittent movement parts are all
hardened steel parts, ground to exacting
tolerances, thus making flatuless operation.
The sprockets are hardened for
longer loear. thereby practically eliminating
under-cutting of sprocket teeth.
Bear in mind, however, in time all
sway. The assembly can be quickly removed
for thorough cleaning.
The film gate pad spring adjusting nuts
can be positioned to provide the proper pad
tension for new as well as old film. Opening
and closing the film gate is accomplished
by the large gate knob device
mounted in the lens holder casting.
The shutter shaft and vertical shaft, including
their respective gears, collars, bearings,
are removable from the mechanism
as a complete unit, thereby making replacement
of various parts an easy job.
The two shutters, though revolving In
opposite directions, are scientifically interlocked
to project picture free from any
travel ghost, once properly set. The use
sprockrt.s, due In iveartng of the constant
pulling down of the film, tvill become
under-cut and should t>e immedtatcly
replaced tn order to avoid unnecessary
film damage.
In this series of articles on projector
maintenance, toe have pointed out the
absolute necessity of taking the units
out and cleaning tiyith either kerosene
or solvent, it'ith a smalt amount of projector
oil mixed in the solvent: we do
strongly favor the kerosene. After scrubbing
the parts tolth a stiff -bristle brush,
rinse them clean and dry with a Untless
cloth.
Modern projectors egulpped ntth ball
bearings—Do not clean the ball heanno^
with kerosene. Projector oil may be
used for cleaning these bearings, but do
not soak the ball bearings in oil. Gears,
brackets, etc.. should be cleaned in the
above cleaning fluid only— W. T.
of rear shutter reduces the heat on the
film: however, for very high amperages.
Century has engineered and designed
water-cooled mechanisms.
To more fully acquaint you with operation
and general maintenance, we pre.sent.
in this article, important Instructions on
servicing the Centur>' mechanisms; the
careful reading of these maintenance tips
should result in better projection and
Continued on following
page
he Century Model C with the cover door open
> show the geon and other components Note the
igged construction, simplicity in the working parts;
iere ore fewer number of gears in this mechanism
> wear, and it is unit-constructed. In a few
•inutes most any of the units can be removed, new
tar or ports installed, and reassembled without any
,.] tecial tools The interior of the gear side of
mechanism should be kept clean and free o/
ly accumulation of dirt or oil. Do not wash the
ill bearings in any solvent, but the other parts, such
I gears, brackets, etc , can be cleaned in fluid,
»rf the ball bearings washed in Century oil, if
scessary, and thoroughly wiped with a clean
eth. However, it is best to simply wipe the ball
ril^tarings clean with a lintless cloth as they do
It require any additional lubricant for their long
• of seryice.
The Century Model CC mechanism with the double
shutter unit and other outstanding features It can
also be equipped with water cooled aperture for
high amperage arcs The shutters are perfectly
timed at the factory but if for any reason they
should need resetting, the writer will be happy to
send complete instructions for correct procedure in
timing double shutters This model is also unitconstructed
so that any unit can be removed and
replaced easily br any intelligent projectionist without
any special tools Cleanliness is of paramount
importance for long life of any make of projector
This is the film side (operating side! of the Century
mechanism equipped to use a d-inch diameter lens
mount. The gate, shoes and guide rollers con
easily and quickly be removed and replaced lor
cleaning or the installation of new ports. The pod
rollers should be adjusted thicknesses of two piecet
of film from the face of the takeup or feed
sprocket The adjustment of the tension on the
intermittent sprocket is explained in the article
It ihould be o daily routine for the projectionist to
clean the interior, upper and lower sprockets, the
intermittent sprocket, tension shoes and gate
Don't allow any occumulotlon of dirt and grit to
pile up on these parts At least 30 minutes every
day should be devoted to checking and cleaning
the projector before the show starts. It will prevent
tudden breakdown and give longer lilt to your prolector
mechanism.
JXOFTICE October 1. 1955 25