Optics: motion pictures – With threading structure
Patent
1974-10-29
1976-11-23
Hayes, Monroe H.
Optics: motion pictures
With threading structure
352173, G03B 156
Patent
active
039934047
ABSTRACT:
There is disclosed a motion picture projector with self-threading mechanism with which has been combined automatic electric clutch and brake means for forward and reverse operations to permit the projector to be used in a search mode, an automatic film tension control means, an automatic lower-loop setter, a switch for stopping the projector upon loss of the upper loop, a frame counter and a pre-threaded projection magazine which fits over the reel arms and threads in the same manner as the conventional reels. The projector has in the front panel of its enclosure a slot into which is insertable a length of film extending between the two reels of the projector. After dropping a length of film into the slot the lever is pivoted from its leading position into its threading position. While being so pivoted, the lever sequentially causes locking of the film to the take-up sprocket, then to the supply sprocket, then forming the lower loop, then the upper loop, and finally pressing the film into the film channel. The threading mechanism further comprises a control switch arm selectively settable from an OFF position either on forward or on reverse. Setting the control on forward causes wrapping of the film about the capstan of the projector and starts operating of the projector in a conventional manner. Setting of the switch arm on reverse with the pivotal lever in its threading position causes release of the film from the capstan and driving of the film through the projector in reverse direction.
REFERENCES:
patent: 3734602 (1973-05-01), Deck
patent: 3743398 (1973-07-01), Johnson
patent: 3811760 (1974-05-01), Rube
patent: 3848981 (1974-11-01), Chedister
patent: 3857633 (1974-12-01), Easterly
Beckman Frank H.
Coomer Roger W.
Marquis Ray L.
Hayes Monroe H.
Kalart Victor Corporation
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