Patent GB-1048211-A (GB)
Title: Motion picture film projector
IPC: G03B21/02
Filed: 1964-01-29
Abstract: 1,048,211. Cine projection apparatus; cine films. PANOPIX RESEARCH, Inc. Jan. 29, 1964 [Feb. 11, 1963], No. 3764/64. Headings G2C, G2E and G2J. A horizontally driven cine film as disclosed in Specification 1, 048, 212 which may be 70 mns wide, has 8 mn or 16 mn pictures arranged side-by-side in a plurality of longitudinal rows 56, 57,&c.wherein the width of the scene extends along the length of the film 50 so that the film movement per frame is increased and the range of audio-frequencies for sound reproduction is improved, the rows of sound tracks 66 being arranged in a separate array 64 below the picture rows. The picture sequence changes direction for each successive row and as notch 62 actuates switches 198, 200 the film is accordingly reversed in direction at the end of each row and is also stepped laterally to move to the next row. A cine projector for use with the above film and having sound reproduction means comprises a cabinet 2 with a rear projection screen 4, a loudspeaker 6, and a recess 8 to receive a film cartridge 10. Light source 142 in the recess enters the cartridge and projects light through the film and through slot 112 into lens system 144 which, by means of inclined mirrors 146, 148, and 150, focuses an image on screen 4. Direct projection on to an external screen is possible when mirror 146 is swung aside and door 20 opened. A film footage indicator 36 is provided. Cartridge 10 comprises a container 90 whose front wall 92 has slits 114, 112, and the film is led from a supply reel 94, round bosses 98, 100, 102, and 104 depending from a spring-loaded upper plate within container 90, to take-up reel 96, the film being held against the bosses by fingers 110. Pins 132 upstanding from recess 8, enter holes 122 in the base of container 90 and lift plate 106 to release reels 94, 96 from braking pressure against the base. Spring-urged plate 116 holds film 50 against slot 112. The base of the cartridge has opening 120 for light source 142, and slots 124 in which move the rectractable spring pressed pressure rollers 188 to hold the film in driving contact with friction rollers 180, 182, 184 and 186, which correspond in size and position to the bosses 98- 104 and project upwardly from the plate 160 in recess 8 to enter openings 140 in the cartridge. When the cartridge is placed on the machine, rollers 188 move in their slots to move the film away from fingers 110 into contact with rollers 180-186. Cartridge mounting. The plate 160 supporting the cartridge is vertically movable to permit the lateral film shift past fixed light source 142, and has tubes 162 sliding over guide rods 164 fixed to the cabinet base. Reversible motor 170 drives to one member of a one-revolution magnetic clutch 172 which drives gear nut 168 on threaded rod 166 fixed to plate 160, one revolution of nut 168 thereby shifting plate 160 through the spacing between adjacent rows of film pictures. The friction rollers 180-186 and reel drive shafts 194, 196 have hollow spindles journalled to plate 160 and slidably keyed on to driving shafts fixed relative to the cabinet 2. Light source 142 is mounted on fixed wall 202 and projects up through aperture 204 in plate 160. Handle 12 operates a latch mechanism to lock cartridge 10 in position by means of detent 225 whose motion is transmitted by spring-loaded rod 231 and links 260 to swing the pressure rollers 188 on their arms 250 into the operating position. Film drive. Motor 214 on wall 202 drives shaft 110 on which sound roller 182 is mounted through belt 216 and pulley 218 on its driving shaft which has further pulleys for belts driving drums 180, 184 and reel shafts 194, 198. The motor operates through a gearbox 302 to drive shaft 304 at two selective speeds, and a solenoid operated clutch allows the motor to be disconnected from all drives for single frame projection. Commutators 320, 322 are driven at the other end of the motor. Sound drum 182 is driven at constant speed by the engagement of a friction wheel 332 on the drum shaft with a heavy driven flywheel 334 through an intermediate wheel 350 for one direction of rotation, and through wheels 352 for the other. A notched bar 328 depends from plate 160 and is engaged by an arm 340 projecting from the spring- urged slide member 336 on which wheels 350, 352 are mounted. As plate 160 is incrementally raised, and arm 340 moves either in or out of a notch, and wheels 350 and 352 are alternately engaged to reverse the drive. Slide 336 has an arm 372 on which are journalled gear 374 and pulley 376 which drives all friction drums and is therefore driven in either direction as the movement of slide 336 engages either gear 310 or 312. Intermittent drive. Pulley 326 on motor 214 drives through belt and pulleys, the mechanism 380. The pulley 378 drives a shaft having an eccentric crank-pin which enters a slot in a claw member which is thereby reciprocated parallel to the film surface. The claw slides on a spring-loaded guide member which is reciprocated normal to the film by a solenoid whose frequency of energization is decided by the speed at which commutators 322, 320 are driven through gear-box 318. Switches 360, 362 are alternately actuated by slide 336 to connect one commutator for forward film motion and the other for reverse. Sound reproduction. Sound tracks 66 have a closer spacing than the picture frames on film 50 and sound head 210 and the indexing motion of plate 160 is therefore transmitted to head 210 by a lever pivoted at a point which gives a proportionally smaller movement of the head. Conventional films may be projected on screen 4 when a prism system is interposed between lenses 144 and the mirrors so as to rotate the projected image through 90 degrees. This film is mounted on adaptor which carries the reels horizontally and replaces the cartridge 10.'Motor 214 is run at a lower speed.