Patent GB-385845-A (GB)
Title: Motion picture projecting and sound reproducing apparatus
IPC: G03B31/00
Filed: 1932-05-24
Abstract: 385,845. Sound-reproducing apparatus associated with kinematographs. THOMAS, LA V. E., 1320, Washington Boulevard, Venice, California, U.S.A. May 24, 1932, No. 14697. Convention date, June 1, 1931. [Class 40 (ii).] Comprises an attachment which adapts for use with separate sound and picture films a motion-picture projecting and sound-reproducing apparatus which has been constructed for use with combined sound and picture films. As shown by Fig. 1, the picture-projector and sound-reproducer includes a case 12 which contains the projector mechanism and supports a film magazine B and a sound-reproducing apparatus 11. A combined sound and picture film is adapted to be drawn through the gate 14 by an intermittently-operated sprocket 17 and. fed into the sound head 11 by a constant-speed sprocket 19. A guide 23 receives the film after its passage through the sound head 11 and directs it to a take-up reel 24. The new attachment, which is shown by Fig. 6 in sectional view along the line 6-6 of Fig. 5, is mounted on the projector head 12 and includes a housing 29, carried on a plate 28, which encloses a take-up reel 31 for reeling up the picture film P after its passage through the picture gate 14, the film P being guided by a roll 32, Fig. 5. A supply reel 34, Fig. 6, also mounted within the housing 29 is adapted to support the sound film S, which is guided to the sprocket 19 by rolls 80, 83. The side 39 of the housing 29 is adapted to be swung open about a hinge 40, Fig. 1, so that the interior is readily accessible. The reel 31 is mounted on a shaft 45 extending through a bushing 47, as shown by Fig. 2 in sectional view along the line 2-2 of Fig. 1, and means 48 are provided to enable the reel 31 to be released. Mounted rotatably on the bushing 47 is a pulley 50 connected with the shaft 45 through a spring-pressed slip clutch 51 that permits the reel 31 to drag when the reeled film P becomes of large diameter, and the pulley 50 is rotated by a belt 52 from the projector driving means. The picture film P is guided from the sprocket, 19 to the reel 31 by a pair of guide rollers 54 through an opening 55 in the front plate 28 to two laterally spaced coaxial sprockets 56, 57, Fig. 6, which serve to offset the film into the plane of the reel 31. The sprockets 56, 57 are fixed on a shaft 58, and the film passes under the sprocket 56 and in a loop L to the underside of the sprocket 57. Rollers 62 guide the film P through an opening 63 in the circular part of the housing 29 to the reel 31. The supply reel 34 is mounted rotatably on a shaft 68, Fig. 2, carried by a boss 69 in a partition 66. A pin 70, having a pointed inner end, is screw-threaded through an opening in a plate 71 to fit into a socket 72 in the other end of the shaft 68. A ring 74 mounted on the outer side of the reel 34 carries leaf springs 76 adapted to press against the side 39 of the housing 29 to provide a yielding resistance to the rotation of the reel 34 and so provide for the proper unwinding of the sound film S. The film S is guided from the reel 34 to the underside of the sprocket 19 and from thence is led through the sound head to the take-up reel 24.