Boxoffice-October.01.1955

. They
PROJECTOR MAINTENANCE
30
Your popcorn
taste terrific . . .
Your seats
be softest . . .
may
may
BUT
EVERY PERFORMANCE
STILL
MUST BE PERFECT!
Perfect performances demand equipment that's kept in the pink of condition.
An expert RCA Theatre Service Engineer is the man best qualified to do this.
He's the only man who commends all the vast technical resources of RCA.
RCA SERVICE COMPANY, INC.
A Radio Corporalion of America Subsidiary
Camden, N.J.
sure are if they're worn— and
your patrons won't approve! To stop that very annoying film jump
caused by worn parts, hove your projectors over- ^SUPE/?^
hauled using the finest parts throughout— LaVezzi, of ''^^^jf^^y
course! Your Theatre Equipment Dealer has them. mr. «< pu. on.
LaVezzi Machine Works
4635 WEST LAKE ST. CHICAGO 44, ILL.
Continued from preceding page
bushing. Pull the stud and knob straight
out of the arm and remove the balls and
springs. Install new springs and balls in
the arm. Insert the stud and knob in position
in the arm and replace bushing on stud.
Press stud and knob firmly against arm and
align bushing with its tapered hole inserting
the taper pin securely. If these instructions
are followed carefully, you should
have no trouble in replacing parts and getting
the arm aligned correctly.
METHOD OF REMOVING FILM TRAP
The removing and installing of the film
trap in the standard mechanism is simple
procedure but should be accomplished as
per the following instructions: Remove
the trap by taking off the light shield
assembly first, loosening the two retaining
screws just above and in back of the film
trap. You next open the gate. Now remove
the intermittent movement; take out the
three screws holding the film trap (one of
these will be exposed when the light shield
is removed from the mechanism* . The film
trap can now be removed by pulling it
straight out. Take out the four screws
holding the film trap guides. This will
allow the film trap guides and shoes to be
either replaced or reversed. Note, the film
trap shoes and guides may be reversed
from right to left providing twice normal
service from these parts.
It is of the utmost importance that the
film guides should be positioned correctly
on the film trap by using Century, number
Cl-E-30, film guide gauge. The guide on
the sound track side of the film must be in
line with the fixed side of the upper lateral
guide roller. The inside upper lateral guide
roller must have sufficient clearance so as
not to touch the edge of the film. By using
the gauge you will be able to correctly set
these parts for perfect operation.
HOW TO INSTALL FILM TRAP
Installing the Film Trap (standard) —
You will please note, before you re-Install
the trap, there are two guiding pins which
keep the film trap accurately in line and
at right angles to the optical center line.
These pins hold the trap in vertical alignment
when it is moved backward and forward
for adjusting the film trap shoes to its
proper relation to the intermittent sprocket.
Install film trap a.ssembly in mechanism by
engaging the locating slot in the assembly
with dowel pins on the mechanism frame
holding the film trap lightly in place with
the three mounting screws. You are now
ready to replace the intermittent movement
in the mechanism. Make two thicknesses of
film around the intermittent sprocket.
Place a straight edge (Century tool number
51) against the face of the shoes and let
it extend down to the intermittent sprocket.
Holding the straight edge, move the film
trap forward or backward until the straight
edge comes into contact with the film
around the sprocket. You now have the
a.ssembly correctly aligned: firmly tighten
The MODERN THEATRE SECTION