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THE PROJECTOR
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has a tendency to wrap itself around a sprocket. The stripper prevents this, forcing the film off, and keeping it from damaging itself against the sprocket teeth.
(24) Fig. 129 shows the gear or driving side of the mechanism illustrated in Fig. 126. Power is transmitted from the motor to the soundhead, and from a soundhead gear, the top of which can just be seen at lower left, to the gears of this mechanism. ( A"shock-proof " gear, included in all more recent models of this projector — the Simplex E-7 — is not shown in the drawing. ) The larger of the lower gears drives the lower sprocket. The large gear just aboye this drives the intermittent movement (to be described hereafter) which in turn drives the intermittent sprocket. The upper sprocket is driven by a smaller gear, shown in mesh with a spiral gear mounted on an obliquely vertical shaft. The horizontal gear in the center of the picture drives the shutter shaft. The thin metal tubing (some of which can be seen between the oblique gear and the shutter gear) is part of the oiling system. By pressing a lever at the operating side of this mechanism (Fig. 126) the projectionist forces oil under pressure through these small tubes, which deliver it to each shaft in precisely the correct quantity and perfectly clean because it is filtered under pressure.
(25) Fig. 130 shows the driving side of the DeVry projector, in which gears are to a large extent replaced by sprocket chains. The chain leading obliquely downward toward the bottom of the drawing is driving the take-up. Fig. 131 is the operating or film side of the
Figure 129