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Fig. 3. Magnetic soundhead.
reproducer and simplification of the mechanism was made possible through a unique operational feature. The film is pulled through the unit by the picture projector, thus eliminating the need for a separate interlock drive motor or drive gearing from the projector.
Some idea of the compactness of the unit may be obtained from Fig. 3. In this view may be seen the door, mechanism housing, rear cover and part of the mechanism-panel assembly visible through the glass window of the door. The first three parts mentioned above plus the mechanism panel are of cast aluminum construction. The exterior of the unit is finished in an umber gray wrinkle. A light-colored finish is used on the inside surfaces to provide better visibility for threading.
The door is hinged and is attached to the housing at the right side in accordance with standard projector and soundhead procedure. The rear cover is attached by screws since it seldom need be removed. The mechanismpanel assembly is supported in the housing by means of four rubber isola
tion mounts with adequate clearance being provided between the edges of the panel and the interior of the housing to eliminate any metal-to-metal contact between the panel and housing. Likewise, no parts affixed to the panel, other than the isolation mounts, are in contact with any parts fastened to the housing. This is an important feature of the design since experience has proven that vibration of the magnitude, which may be present with the majority of motion-picture projectors, can adversely affect the film motion at the region of film contact with the magnetic head, giving rise to excessive high-frequency flutter.
Figure 4 shows the soundhead with the door open. Mounted on the mechanism panel may be seen the upper and lower film sprockets, pad rollers, sprung-flange guide roller, pressure roller, impedance drum, magnetic-head assembly, a sprung double-roller assembly, three fixed-position rollers, which assist in formation of the correct film path through the unit, and part of the shield of high-permeability metal
Phyfe and Hittle; MuUifcrack Sound Reproducer
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