Patent GB-322233-A (GB)
Title: Improvements in and relating to combined motion picture and sound reproducing apparatus
IPC: G03B31/00
Filed: 1928-07-20
Abstract: 322,233. Beatty, W. E., (Bell Telephone Laboratories, Inc.). July 20, 1928. Divided on 321,148, [Class 40 (ii), Phonographs &c.]. Kinematograph apparatus. - Relates to combined kinematograph projectors and sound - reproducing apparatus, and consists mainly in a construction wherein a soundfilm reproducing apparatus is built into or permanently secured to a support or stand on which a motion-picture projector is adapted to be detachably mounted. The stand may consist of a fixed base part and a tilting head to which the projector can be attached, the sound-film reproducing device being built into the tilting head. The apparatus shown comprises a bed-plate 1 mounted on adjustable legs 2 and having bolted to it a magazine 27 for housing the take-up reel for a combined sound and picture film. The magazine, Fig. 2, consists of a casting, the back plate of which terminates in a double flange 27<1> extending to either side. A bracket 31 bolted to the top of the magazine is provided with trunnions for supporting the tilting head or upper base 71 which carries the projector and the optical soundreproducing equipment. The member 71, Fig. 6, is supported by a bushing 202 which extends through bearings in the bracket 31 and the part 71 respectively. A shaft 203 which drives the film through the sound-reproducing device passes through the bushing 202, so that the upper base can be tilted as required by rotating it about the axis of the shaft 203. The base 71 is extended rearwardly at 44 to support tubular members 42, 43 on which the arc lamp (not shown) is adjustably mounted. A projector head 72 of any suit. able construction is also mounted on the upper base by means of adapter plates. To adjust this base, so that the projector head may be tilted to any desired angle, it is provided with a curved extension 32 to which a bar 33 is connected. The bar is adapted to slide through and be clamped to a member 34, trunnioned to the arm 32, and is threaded at its lower end into a nut rotatable by a hand wheel 87. A supplementary device for clamping the upper base in adjusted position is provided by a threaded rod with a handle 41, the rod passing through the upper base 71, and, when rotated, drawing a threaded block against a sector 40 on the bracket 31. An electromotor 4, mounted on the bed-plate 1, transmits power through a fly-wheel 17 to a gear-box 18, Fig. 1, the main shaft driven by the motor having at its end a hand-wheel 19 which enables the mechanism to be rotated slowly when required. From the gear-box, vertical spindles 20, 21 are driven, and a third spindle, not shown, carries a sprocket which, through a chain 22, drives a sprocket 24 whereby the take-up reel is rotated through a friction clutch. The spindle 20 transmits the drive to means for feeding the film through the projector-head 72, through mechanism as described in Specification 320,864, which includes a telescopic shaft 66 with universal joints. The spindle 21 is coupled to a shaft 59 from which the shaft 203, feeding the film through the optical sound-reproducing apparatus, is driven. The shaft 203 carries at one end a sprocket 112 engaging the film, Figs. 4 and 6, and at the other end a flywheel 31<1> to which rotation is transmitted from the shaft 59 through a spider and vibration-damping springs. After passing over the sprocket 112 and an idler 128, the film passes down a shoot 129 to a sprocket 130 which is constantly driven by means of the chain 22, Fig. 1, and is finally wound up on the reel 137. The frictional drive of the reel allows slipping as the diameter of the film roll increases. The film is slack between the sprockets 112, 130, so that irregular pull on the film from the take-up reel cannot be transmitted beyond the sprocket 112. The shoot 129 has a detachable cover 131, so that the film can be readily threaded therein. A pedal 58 operates a switch in the motor circuit and a brake acting on the flywheel 17, depression of the pedal first opening the electric circuit and then applying the brake. Specifications 322,234, 322,235, 323,008, and 323,046, [all in Class 40 (ii), Phonographs &c.], also are referred to.