Patent GB-1129602-A (GB)
Title: Automatic film projector
IPC: G03B21/43
Filed: 1965-09-07
Abstract: 1,129,602. Cine projector apparatus. COMPAGNIE D'APPLICATIONS MECANIQUES A L'ELECTRONIQUE, AU CINEMA ET A L'ATOMISTIQUE. Sept. 7, 1965 [Sept.18, 1964], No.38239/65. Headings G2E and G2J. [Also in Division G5] In a self-threading cine projector, with sound reproduction, one film is projected while another is being re-wound, the end of the film to be projected is transferred from the supply spool to the take-up spool by means of an arm such as 19 pivoted to a take-up spool flange at crank-pin 48 and actuated by rotation of the take-up spool 16, the arm engaging a clip holding the film end and detachably held in peripheral grooves in the supply spool flanges as in Specification 1,080,923. Continuous film feed with oscillating mirror compensation may be used, two supply reels being coaxially mounted on a plate 14 above two coaxial take-up reels. Plate 14 is rotatable about axis 14a through 180 degrees when its supporting cradle 12 is swung about shaft 13 to bring one pair of reels such as 15, 17 from the projection to the re-wind station, these pivoting movements being automatic. Roller carrying levers (10, 11), Fig.2 (not shown), apply the film against sprocket wheels (7), film guide (8), and sound head (9), the projected beam being directed on to a rear projection screen by a mirror system. Supply reels (17, 18), Fig.6 (not shown), are driven through friction discs by shaft (127) bearing pulleys (38) which engage a driving roller through a shiftable intermediate roller. Take-up reels (15, 16), are also driven through friction discs by a shaft (45) coupled through dog-clutches (44) at each end with the drive from motor (43). Pinion (54) on shaft (45) engages planetary pinions (132) rotating between two plates (53) having notched peripheries. Reels 15, 16 each have a spring-loaded rocking lever 50 pivoted at 123, and having on one arm a stud 137 engaged by transfer arm 19 or (20), Fig.6, while projections 52 of levers 50 may engage the notches in plates 53. On another arm 138, is projection 63 which passes through perforations in the film or leader, and arm 139 has pallet 64 at its end to engage the rocking lever 65 carried at the top 67 of the spring-biased sickle-shaped lever 10 pivoted at 82 between the take-up reels and bearing loop-forming rollers. To start the projector, catch-lever 40 is manually raised to release arm 19 and to actuate contact 99 through push-rod 41 and start the motor (43), Fig.6. Reels (15, 16) are driven, and arm (19) pulls the film clip from the delivery reel, its heel 49 releasing stud 137 whereby reel 15 is coupled to plate 53, as lever 50 enters a notch in the plate, and is driven at a reduced speed through gears 54, 132. Further rotation of reel 15 brings arm 19 to stop 60 on the reel flange with film clip adjacent the inner end of an arcuate recess 141 in the flange, centred on pin 48. Film then winds on to the reel hub until the perforations end when projection 63 is depressed whereby lever 50 pivots and releases reel 15 from plate 53, while pallet 64 actuates lever 65 to stop motor (43) through contact 69, and start the cycle motor (70), Fig. 13 (not shown). Motor (70) actuates lever 10 which applies the stationary film to the projection system, and then cam (83) on cam shaft (72) actuates contact (84) to re-start motor (43), and projection proceeds until pin 26, Fig. 7, passes through end perforations in the film whereby catch 27 projects beyond the supply reel flange and actuates contact 98 to stop projection and sound while allowing motors (43) and (70) to continue running. Lever 10 is retracted, the loops are taken up, and cam (100), Fig.13, then stops motor (43), and the drive to the supply spool is disengaged by cam (109) and rod (112). Cam (102) on shaft (72) pivots cradle 13, plate 14 is rotated as above, and simultaneous projection and re-winding may commence. The invention may be applied to sound recording or reproducing apparatus using tapes.