Patent GB-944040-A (GB)
Title: Apparatus for projecting sound and moving picture films
IPC: G11B15/68
Filed: 1960-03-08
Abstract: 944,040. Cabinet sound-film projectors. SOC. INTERNAZIONALE FONOVISIONE. March 8, 1960 [March 21, 1959], No. 8206/60. Heading G2E. A coin- or slug-freed cabinet-type soundfilm projector includes a reel-holder carrying a plurality of film-reels, each film carrying a hook which, on selection of a particular film, an oscillating lever can bring into connection with a common, empty take-up reel, means for feeding the film past optical and acoustical reproduction means and means for rewinding the film. As shown in Figs. 1 and 2, selector knob 1 adjusts the orientation of cam 10. Insertion of a coin at 3 trips a switch to energize a relay (not shown) which allows depression of button 4 which in turn energizes relay 8 to lock the selector dial by engagement of the pin and ratchet 9 and also energizes motor 11 whereby wheel 13 is rotated together with drum 16 carrying the film-reels in an array of radially extending forked holders 17, a switch 14 carried by the wheel 13 being opened to stop motor 11 by the nose of cam 10 the angular setting of which by knob 1 determines the amount of rotation of wheel 13, and hence the orientation of drum 16, prior to stopping and presentation of the selected film reel 18 (Fig. 4) in the projection position. The operation of switch 14 by cam 10 also energizes solenoid 15 to lock wheel 13 in position, solenoid 15 energizing a motor (19, not shown) driving flywheel 20 which during its first half revolution actuates connecting rod 21 to pivot anticlockwise lever 22 the tip of which is adapted to engage a hook 24 carried on the end of film 23 and thus bring the hook into the dotted position where it can be engaged by take-up reel 25 which has slots in its flanges for guiding the end of the film towards the hub of the reel. At the end of its travel, lever 22 energizes solenoid 29 to set in operation a motor for driving reel 25 (a speed limiter being operative until it is cut out by monitoring lever 37 when sufficient film has been wound on to spool 25) and also allows the drive from the motor 19 (operating flywheel 20) to be transmitted to a flywheel 30 which eccentrically supports the film-pressure device 31. When the latter reaches the film-engaging position, it deenergizes solenoid 29 to lock the pressure device in position, stop motor 19 and energize the projection and amplifier systems. (During the operation of flywheel 30 by motor 19, further rotation of flywheel 20 has no influence on lever 22 by virtue of the lost-motion slot in rod 21.) A feed sprocket is indicated at 39, and 40 is a magnetic sound-head. The optical projection system, indicated schematically at 34, is preferably of the "Nioviola" type. Rewinding. When film on reel 18 has almost run out, lever 42 trips switch contacts 43, 44, 45 to produce the following results: (1) feed sprocket 39 stopped (2) solenoid 29 re-energized and motor 19 causes rotation of flywheel 30 to lift pressure device 31 clear of film (3) projection and amplifier systems de-energized (4) solenoid 46 energized to allow contact of roller 47 with flanges of reel 18. The roller 47 is driven by a motor to rewind the film.