Patent GB-482749-A (GB)
Title: Improvements in sound picture apparatus
IPC: G03B31/02
Filed: 1936-10-05
Abstract: 482,749. Combined sound and kinematographic apparatus. GUMBINER, R. Oct. 5, 1936, No. 26950. Convention date, Oct. 4, 1935. [Class 40 (ii)] [Also in Group XXXV] An apparatus for recording or reproducing sound and pictures has a sound-record film and a picture film, or a combined sound-record and picture film, moved past the sound-reading and picture-projecting or camera gates by separate electric motors, the motor of the picture-projecting apparatus being controlled by the movement of the film past the sound gate. A combined sound-reproducing and picture - projecting apparatus has a supply spool 12, Fig. 1, from which the film F is led round a sprocket 15, through the picture gate 20 with known intermittent feed mechanism 25, thence, round a sprocket 29 and idle roll 35, through the sound gate 37 after which it passes round a frictional driving drum 50 and rollers 80, 84 to the take-up spool 13. The roller 80 is mounted on an arm 81 which is pivoted at the fixed centre of the roller 84 and is urged by a spring 83 to press the roller 80 against the film passing round the drum 50. The drum 50 has a rubber ring 56, Fig. 2, and is mounted on a hollow shaft 51 having secured thereto a disc 65 with felt &c. facing 67 against which a disc 74 driven by a belt 75 from a constant speed motor 77, Fig. 1, is pressed by a spring 71, in order to drive the drum. A spindle 63 freely rotatable within the shaft 51 carries a sprocket 60 which is driven by the film wrapped on the drum 50, the spindle 63 thus being driven exactly in step with the film, irrespective of slip between the film and drum 50. The spindle 63 carries an insulated ring 121 with a contact 122 which lies in the path of a contact 108, Fig. 4, on a spring-influenced arm 107 mounted on a disc 103, Fig. 2, which is insulated from but driven by a gear-wheel 98 coupled through a gear 97, shaft 96 and gears 95, 94, Fig. 1, to the sprocket-driving- gears 93, 92 of the picture-projecting apparatus, these gears being driven through a pinion 91 by a separate electric motor 90. The motor 90 is designed to run at a speed slightly greater than that of the motor 77. The wiring for the motor 90 comprises a main lead 132, a main lead 130 connected to a brush 128, Fig. 2, bearing on the ring 103, and a lead 131 connected to a brush 129 bearing on the ring 121. The motor 90 is thus energized only when the contacts 108, 122 engage, and synchronous running of the motor 90 with the spindle 63 is ensured as the contact 108, owing to the slightly higher normal speed of the motor 90, tends to move ahead of the contact 122 immediately these contacts engage to energize the motor 90. In the case of separate sound-reproducing and picture-projecting units, the sound-record film F is led from a supply spool 143, Fig. 7, in the magazine 142, over a sprocket 148 which is subjected to a frictional drag, and thence through the sound gate 163 to a frictionally-driven drum 168. The film is releasably retained on the sprocket 148 by a roller 149 on an arm 150 under the control of a lock and release device 151. The film passes round a roller 169 on a spring-influenced arm 170 and thence round idle rollers 171, 176, 177 to the take-up spool 144. The drum 168 is mounted on a hollow shaft carrying a wheel 188, Fig. 9, which is frictionally driven by a roller 190 on a spindle 191 at the end of a pivoted arm 192, the spindle 191 carrying a wheel 194 belt-driven by a constant-speed motor 197, the tension in the belt being employed to press the roller into driving engagement with the wheel 188. A sprocket 200 engaged by and driven by the film is fast on a spindle 202 passing freely through the hollow shaft of the wheel 188 and carrying an arm 214, Fig. 10, provided with two brushes, one, 212, of which moves over a number of segments 209, the other, 213, moving over a collecting ring 210. The motor 206 driving the pictureprojecting apparatus has an arm 220 provided with brushes which move over corresponding segments 208 and collector ring 217. Corresponding segments are electrically connected by wires 222, the motor being in circuit with leads connected to the rings 210, 217. The motor 206 is designed to have a normal speed slightly greater than that of the motor 197 and therefore is energized only when in step with the sound-film-driven spindle 202. U.S.A. Specification 2,099,987 is referred to.