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WESTREX STANDARD SOUND FILM REPRODUCER*
G. S. APPELGATE** AND J. C. DAVIDSON f
Summary. — A simplified sound film theater reproducer is described. The machine holds the film under constant tension and has a minimum of moving parts.
A review of the theater field for sound film reproducers has indicated a definite need for a machine that will fulfill the requirements of the relatively large field where equipment cost is a prime factor. Since the requirements permit no compromise on quality or performance, the need for a new basic design was indicated. Accordingly, the development of a machine was undertaken on this basis and each part was given a careful scrutiny to justify its use from the viewpoints of either assured performance or operating necessity. This work has resulted in a reproducer whose component parts are surprisingly few and yet whose film propulsion performance falls well within the recommended standards of the Research Council of the Academy of Motion Picture Arts and Sciences.
A front view of the machine is given in Fig. 1, showing the film, lamp, and photocell compartments. The film path is perhaps as simple as has been offered to the theater industry and approaches a straight vertical line from the holdback sprocket in the projector head to the lower magazine with no free loops to be set. The film is under a tension of approximately 300 grams from the lower sprocket in the projector to the sound sprocket in the reproducer.
The threading operation is both quick and simple. The film is passed under the upper filter arm roller, over the scanner drum, and over the lower filter arm roller. Before engaging the sound sprocket the film is pulled down until the arrow and line on the filter arm assembly are in approximate registry. The film is then engaged around and under the sound sprocket and over the idler roller which guides it into the fire trap of the lower film magazine.
* Presented Oct. 16, 1945, at the Technical Conference in New York. ** Westrex Corporation, New York.
f Electrical Research Products Division, Western Electric Company, Hollywood. 272