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332 NEW MOTION PICTURE APPARATUS [J. S. M. p. E.
lateral adjustment by means of which it may be correctly aligned with the runners on the film-trap.
The film-trap is of completely new and original design and may now be removed entirely for cleaning purposes as may the gate (Fig. 7). This is accomplished simply by the removal of two screws, whereupon the film-trap may be slid off toward the projectionist. The film-trap is provided with the conventional lateral guide-rollers, but, in addition thereto, edge-guiding channels have been added which, in cooperation with the lateral guide-rollers, maintain the edge of the film steadily against the edge of the guide, thus eliminating all sidesway during film travel. The film-handling parts of both the gate and film-trap are readily removable for replacement when wear becomes apparent, and it is no longer necessary to tear down the entire projector when such is the case.
FIG. 8. Framing lamp and spot sight box.
As in the case of previous film-trap and gate design in Simplex projectors, the emulsion side is always toward the film-trap runners; thus, variations in film thickness, as between standard production film and newsreel stock, will not affect the definition of the projected picture; thus, it is not necessary to re-focus the lens to compensate for the difference in the position of the emulsion as is the case with the old Powers projector mechanism and other equipment of similar design.
An ingenious framing lamp and spot sight box assembly is mounted between the rear shutter and the film-trap (Fig. 8). A small incandescent lamp of the bayonet type is pivotally mounted in this assembly and operable only when the fire-shutter is raised manually during the process of threading the film into the projector; thus, a strong, direct beam of light is projected through the aperture plate by means of which the projectionist may accurately select the frame of film to be placed over the latter. The lamp is lighted through a small mercoid switch and extinguished upon release of the fire-shutter lever which automatically takes the framing lamp assembly out of the path of the projection lamp beam and extinguishes it at the same time.