Optics: motion pictures – Removable film strip magazine type
Patent
1975-06-05
1976-09-21
Hix, L. T.
Optics: motion pictures
Removable film strip magazine type
352214, 354254, 354256, 354260, 354261, G03B 916
Patent
active
039822567
ABSTRACT:
Rotary shutter blade mechanism includes at least a shutter blade which rotates always in one direction. The driving energy of the shutter blade is recovered by a driving spring in the course of deceleration of the blade. An auxiliary actuating means is adapted to supply one directional rotative force to the driving shaft of the blade. A rotary cam means is secured to the driving shaft and has at its periphery at least one pair of accelerating portions and decelerating portions. A reciprocating lever means is pivotally mounted in the body portion of the mechanism. The lever means has a portion engageable with the accelerating and decelerating portions. A main actuating means urges the lever means so that the engaging portions may contact the rotary cam means. The driving shaft is locked when the respective foremost ends of the accelerating portions are engaged with the engaging portion of the lever means. The accelerating portions are designed to receive pivotal motion of the lever means while pressed at said engaging portion by urging force of the main actuating means for rotating said cam means in said one direction when the lock on said driving shaft is released, while said decelerating portions are so designed as to pivot said lever means with rotation of said cam means through said engaging portion in the direction opposed to the urging force of said main actuating means and to let said lever means return to its original position for stopping said driving shaft, and said cam means is so formed that the foremost end of said accelerating portions will be positioned adjacent to the rearmost end of said decelerating portions.
REFERENCES:
patent: 2788704 (1957-04-01), Habig
patent: 2925763 (1960-02-01), Hill-Venning
patent: 3099196 (1963-07-01), Neubert
patent: 3693523 (1972-09-01), Tenkumo et al.
Kimura Shuji
Ohmori Sachio
Hix L. T,.
LaBarre James
Nippon Kogaku K.K.
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