Sound motion picture projection apparatus

Details Sound motion picture projection apparatus Sound motion picture projection apparatus

1978-06-20

1979-06-26

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

352158, G03B 3100, G03B 158

Patent

active

041591674

ABSTRACT:
Disclosed is a sound motion picture projection apparatus in which a head pad is urged by a spring member toward a film pressing position at which position the head pad presses a film against a magnetic head disposed along the sound recording and reproducing film path. The apparatus has a set mechanism of the self-holding type which sets the head pad against the urging force of the spring member to a film pressure releasing position at which position the head pad releases the pressing of the film, by the driving force of a driving motor and keeps the head pad to that position. The apparatus further has a film detecting member which is disposed in said sound film path after the magnetic head and operatively connected with the set mechanism in such a manner that the holding of the head pad at the film pressure releasing position by means of the set mechanism is released when the film detecting member detects the film introduced into the sound film path and thereafter the setting operation of the set mechanism is made ineffective as long as the film detecting member detects that a film exists in the sound film path. Thereby when the set mechanism is driven by the driving motor when no film exists at least in the sound film path, the head pad is automatically set to the film pressure releasing position and then the head pad is automatically changed from the film pressure releasing position to the film pressing position when the film detecting member detects the introduction of the film into the sound film path.

REFERENCES:
patent: 3597056 (1971-08-01), Sasaki
patent: 3746453 (1973-07-01), Kotler et al.
patent: 3825327 (1974-07-01), Kosarko et al.

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