International projectionist (Jan 1963-June 1965)

Century Projector Announces New Series of Projectors, Sound Systems NEW YORK— A new series of Direct Drive projector mechanisms and sound reproducers, to be known as Series M. has been made available to the theatre trade by Century Projector Corporation. THE VERY.FJUSEST PROJECTOR ' PARTS i 4635 WEST LAKE ST., CHICAGO, ILLINOIS PROJECTIONISTS PREFER ETHYLOID Film Cement For BEST RESULTS Available from Supply dealers FISHER MFG. CO. 1185 Mr. Read Blvd. Rochester, N.Y. 10 Frank E. Cahill, Jr., Century's distribution vice president, stated that the mechanisms are completely new in design and that both the projector mechanism and the sound mechanisms were designed to complement each other and will not be marketed separately. Sold as a combination. Cahill stated, the mechanisms "are the answer to the industry's long felt need for an integrated direct drive assembly." Proved Gear Arrangement The background and history in the development of the gear arrangement which has proven to be reliable over 25 years of operation were commented upon by Cahill, who said that the present day sound reproducer is an addition to the motion picture projector, not a part of a complete and logical mechanical design. The speeds of the several shafts in projectors and sound reproducers now in use were dictated by the design of the original hand-cranked projectors and were never intended for motorized operation. Also is the fact that motion picture projectors were operated at 16 frames per second and then increased to 24 frames per second without adequate re-designs of bearings, shafts, etc. to withstand the increased motorized speeds. A large number of these projectors are still in use. All this has been taken into consideration in designing the new Century direct drive projectors. Cahill said. At the recent Allied-Tesma convention in Cleveland, Century Projector Corp. introduced and displayed this new arrangement for coupling the projector mechanism and sound reproducer together. This new drive incorporates additional features which result in optimum quietness with stable, vibration-free performance, safe and dependable operation. Cahill added. Easily Adapted The New Century drive is said to be easily adapted for interlock or synchronous operation with separate sound reproducers or interlocked together for 3-D projection. Because the main drive shaft of the projector mechanism operates at 1440 RPM ( in exact synchronism with the shutter shaft ) interlock motors are easily attached with simple 1:1 pulleys. Because of the direct drive coupling between the mechanism and the sound reproducer in the new series it is no longer necessary to utilize a timing belt drive between the motor and reproducer, nor from the reproducer to the projector mechanism. Therefore the requirements for stable, quiet mechanical operation are fulfilled without troublesome multiple gear trains, excess gears and extra belts. Analysis of features ( 1 ) Direct Drive Projector Mechanism ( a ) The PROJECTOR Main Drive Shaft Speed is now 1440 RPM ( same as the Shutter Shaft I . ( b ) Good mechanical designs dictate that high speed gears driving low speed gears are advantageous for many reasons. In other words, speed reduction should be used whenever possible. The new Century gear arrangement progresses with mechanical stability from the motor, operating at 1765 RPM. to the main drive of the projector at 1440 RPM. Then a step down in speed to the vertical shaft that now e tends not only upward through the projector but also downward through a flexible, isolation, coupling to the sound reproducer. This vertical shaft running through the mechanism and siund reproducer rotates at 720 RPM. At the several sprocket shafts the speed is further reduced to 360 RPM which is standard sprocket speed for 35mm projectors using standard 16-tooth sprockets. ( c ) Because of the direct drive coupling between the mechanism and the sound reproducer it is no longer necessary to utilize a timing belt drive between the motor and reproducer, nor from the reproducer to the projector mechanism. Therefore the requirements for stable, quiet mechanical operation are at last fulfilled without troublesome multiple gear trains, excess gears, extra belts, etc. The Poly "V" belt incorporates six parallel "V" tracks running in spacesaving pulleys especially grooved to mate precisely with the belt ribs. Thus the advantages of the smoothness of "V" belt drives is combined into 6 "V" belts operating together to give greater power efficiency and additional smoothness. Because the Mechanism is driven directly from the motor through the belt, fluctuations in load from the intermittent movement, sprocket shafts, etc. are not reflected to the sound reproducer. iP International Projectionist February. 1963