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the vital aperture area constantly visible to the operator.
Lubrication System
The lubrication system designed for the Simplex X-L, termed Spray-O-Matic, is said to be one of the most efficient ever conceived for so precise a mechanism as a motion picture projector. The entire area of the scaled-drive compartment is sprayed continuously by a fine film of re-cireulated oil which reaches every drive unit down to the last gear tooth. Nonetheless, due to an effective seal, not a drop of oil is able to reach the film.
The oil-feed unit represents the utmost in simplicity, for it comprises only a high-speed pump, a filter, and a pipe. An oil gauge, with a petcock for drainage, shows the oil level at a glance. It is reported, however, that a projectionist in one of the theatres which tested the Simplex X-L for over a year, stated that there was little need for the petcock, since he had not changed the oil for 16 months. As a matter of fact, at the end of that period, he said the oil was still so clean as to be almost drinkable.
Conical Shutter
It is a well-known fact that the amount and quality of light which reaches a theatre screen depends to a great extent on the design and positioning of the shutter, which scans every infinitesimal frame of film twice for 1/90th second. The most efficient shutter, therefore, is the one which cuts off the light beam at its narrowest point—the aperture—and for the shortest possible time interval consistent with avoidance of disturbing distortion of the screen image.
Since it is impractical to reduce the shutter blade width of a conventional dual shutter to move it closer to the aperture because of the “screen streaking” which would inevitably result, the designers of the Simplex X-L incorporated in their new machine a single-unit, built-in rear conical shutter. This shutter is positioned to intercept the light beam at its narrowest point—only 1%” from the aperture. According to the manufacturer, this novel shutter design effects the maximum transmission and the most sharply defined cut-off of light ever achieved in a motion picture projector with fewer parts, less gearing, and quieter operation.
The extremely close positioning of this simplified shutter to the aperture also enables it to fulfill another important function, for it carries on its film side a series of small vanes which gently spray cooling air effectively over the aperture and the film both.
Adjustment of the conical shutter is readily accomplished on the Simplex X-L by the mere turning of a knurled knob atop the projector housing. There is no need for changing the relationship of the driven ear to driving gear, and there is the added advantage of equal wear on the contacting parts.
Sprocket and Gear Assemblies _Both upper and lower sprockets on the Simplex X-L projector haye 24 teeth, 8 more than the conventional type, and they operate at only 240 r.p.m., a redue
1949-50 THEATRE CATALOG
THE FILM SIDE, looking toward the front (above) and looking toward the back (below), boasts of well lighted cleanliness and of functional plan. Here can be noted the new lens mount, film trap, larger sprocket and takeup assembly, and many other interesting developments incorporated into this recently introduced precision mechanism. The objective was to facilitate aad simplify the human efforts.
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