Patent GB-402285-A (GB)
Title: Film feeding mechanism for talking motion picture apparatus
IPC: G03B19/18
Filed: 1932-10-17
Abstract: 402,285. Combined sound-reproducing and kinematograph apparatus. RADIO CORPORATION OF AMERICA, 570, Lexington Avenue, New York, U.S.A. Oct. 17, 1932, No. 5869/33. Convention date, Nov. 3, 1931. Divided on 394,202. [Class 40 (ii).] A portable talking motion picture apparatus has a filmfeeding mechanism wherein a motor drives intermittent film-feed mechanism from one end of its armature shaft and a constant speed sprocket for driving the film through the sound reproducer from the other end of the armature shaft. The main part of the apparatus is housed within a portable case on the outside of which film reels (not shown) are mounted. The lower reel is driven by a belt 16, passing over a pulley on a shaft 31 carrying a film-driving sprocket 37. The film, fed into the casing by the sprocket 37, passes through a picture film gate 59, over a drum 103 at the sound head, and from thence to a sprocket 38 and to the take-up reel. The armature shaft 35 of a motor 22 drives the sprockets 37, 38 through gearing as shown by Fig. 5, which is a sectional view along the line 5-5 of Fig. 2. The end-bell 30 of the motor 22 carries bearings for the shafts 31, 32 of the sprockets 37, 38 respectively which are driven through a worm 34 on the shaft 35, and a flywheel 36 serves to ensure uniform rotation. Within the other end-bell is mounted the intermittent feed mechanism and its framing mechanism. A gear 39 on the shaft 35 meshes with a gear 40 integral with the intermittent mechanism cams and with a shutter 41. The intermittent feed mechanism is of the claw type and is shown by Fig. 8, which is an underside plan view of the upper portion of Fig. 5 below the picture aperture 45. A member 42, extending from a shaft 43 along which it is slidable through a slot 44 below the aperture 45, carries, at its end extending through the slot 44, claws which engage and move the film. At its other end the member 42 carries an arm 46 adapted to slide along a pin 47 rigidly secured to an arm 48. A pin, not shown, co-operates with the aperture 50 to impart a vertical movement to the claw, and this pin is carried by a member 51, pivoted at 52 to an adjustable arm 53. The arm 51 is provided with an aperture 51a within which a cam 54 operates to move the arm and with it the feed claw. Movement of the feed claw in and out of the sprocket holes is accomplished by a cam 56 which acts upon the member 48 to cause rotation of the member 42 about the shaft 43. Adjustment to position the pictures in proper register with the aperture 45 can be effected by moving an eccentric pivot 55. The picture film gate comprises a plate 59, attached to the motor housing, having a channel to receive the film, and against the plate 59 bears a pressure shoe 60 in the form of a metal plate having outwardly extending ears by which it may be grasped to open. The gate is held in closed position by springs, but may be held in open position by pins 62 engaging elongated apertures in the sides of the gate. The film passes at the sound-reproducing point over a roller 103, Figs. 2 and 3, which is rotatable upon a shaft 110. The interior of the drum 103 is hollowed out and provided with a flat friction surface 111 against which pressure shoes 112 of felt or leather are pressed by springs 113 to exert a damping action.