Forward-reverse projector mechanism

Optics: motion pictures – Camera and/or projector drive mechanisms – With reverse feed

Patent

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Details

352194, G03B 100

Patent

active

039663132

ABSTRACT:
The disclosure relates to a forward-reverse film transport synchronizing mechanism for a motion picture projector film feed apparatus of the type including a shuttle which is driven for vertical reciprocating motion by a transport cam. The mechanism of the present invention includes a rotary shutter which is driven by a rotating shaft and includes a pair of drive lugs arcuately spaced by 180.degree. and axially spaced from one another. A transport cam drive means coupled to the transport cam and including a driven lug which is selectably engageable with one or the other drive lugs causes the transport cam to rotate when the rotating shaft rotates. Because the driven lug is selectably engageable with either of the drive lugs, the angular relation of the transport cam relative to the rotary shutter may be varied by 180.degree. thus providing properly synchronized forward and reverse film transportation without requiring reversal of the angular direction of rotation of the rotating shaft.

REFERENCES:
patent: 3261654 (1966-07-01), Faber

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