Optics: motion pictures – Camera and/or projector drive mechanisms
Patent
1975-01-02
1977-03-01
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
352168, 352180, 74217R, G03B 100
Patent
active
040099504
ABSTRACT:
The present invention relates to a motion picture projection apparatus with film feeding speed changing apparatus which is characterized in that the apparatus presents a driving motor for rotating the first pulley member on which at least more than two pulley parts to be used in accordance with the projection speed are formed and a film feeding apparatus to be operated in cooperation with the second pulley on which at least more than three pulley parts have diameters which are different from each other. This is done in such a manner that a different pulley part is used even for the same film speed in accordance with the frequencies of the current source. A belt to be selectively provided between one of the pulley groups formed on the first pulley member and one of those formed on the second pulley member is included and also included is a changing means for selectively changing the position of the belt in such a manner that the belt is provided between other pulleys of the above mentioned pulley groups so that, by changing the position of the belt on said pulley parts in accordance with the frequencies of the current source and with the necessary film speed by means, of the above mentioned changing means a certain predetermined film speed independent of the frequencies of the current source can be obtained while a certain film speed can be changed into another certain predetermined film speed.
REFERENCES:
patent: 955920 (1910-04-01), Stevens
patent: 2742793 (1956-04-01), Askren
patent: 3165002 (1965-01-01), Hatch
patent: 3597056 (1971-08-01), Sasaki
Canon Kabushiki Kaisha
Hayes Monroe H.
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