Patent GB-356324-A (GB)
Title: Improvements in or relating to cinematographic apparatus
IPC: G03B21/40
Filed: 1930-06-14
Abstract: 356,324. Kinematograph apparatus. LUBOSHEZ, B. E., 108, Station Road, Harrow, Middlesex. June 14, 1930, No. 18303. [Class 97 (i).] A camera or projector comprises a number of lenses each producing or exposing a separate series of consecutive images on a continuous length of film, a shutter to cut off each lens in succession, and means for effecting film change at the corresponding gate during the cut off. As shown diagrammatically in Fig. 1, the apparatus may comprise six lenses L1 .. L6 with radiating axes, each lens having a prism P1 .. P6 to divert its optical axis parallel to the axis of a cylindrical track D carrying a film, or having a prismatic rear part and being of the type described in Specification 335,335, [Class 97 (i), Optical systems &c.]. A shutter S having an angle sufficient to cover two lenses rotates about the axis of the track, and masks successive film movements through gates Gl .. G6, loops X1 .. X6 being provided to permit the movements. Figs. 5 and 6 respectively show diametrical sections of the apparatus through opposite lenses and between the lenses. The film track D, having exposure apertures 15, is formed by a cylindrical shell 4 which carry the lenses L and a front plate 5, and extends from a plate 3 carrying blocks 11 supporting the prisms P. A hollow shaft 16 extends through a boss 53 on the plate 3 and through the rear cover 9 and carries a belt pulley 17 driven by a motor, a gear 19, meshing with pinions 22, operating claw-feed mechanisms, a cam disc 31, and a shutter 5. Each claw-feed mechanism comprises a lever 26, Figs. 6 and 7, having pins 32 engaging the flanged rim of the disc 31, a slot engaging a pin 27 on a normally fixed hub 52, and a claw 20. The claws are moved into and out of the film perforations by a stepped part 33 of the flanged rim and are reciprocated in the direction of feed by eccentrics 21 rotated by the pinions 22. Adjustment of the feed for film shrinkage is effected by rotating the hub 52 about its axis by means of a rod 54 having a locking nut 56. The shutter comprises two driven sectors 34, 36, Fig. 11, respectively fixed to the shaft 16 and to a rod 38 within the shaft 16, and loose sectors 43 between them. The shutter aperture may be varied from nothing to a maximum by rotating the rod 38 relatively to the shaft 16, a head 39, carrying a catch 40 engaging holes in the pulley 17 and reading against a scale, being provided for the purpose. The edges of the sectors are bent to prevent separation of the sectors, and to hold them together when they lie one over the other and provide a maximum shutter opening. Each sector is balanced about the shaft by two counterweight discs. Lamps 46 and condensers 47 having reflecting surfaces 49 are provided to illuminate each gate when the apparatus is used as a projector and the gear 19 or other rotating part may carry a contact closing the circuit for each lamp during its projection period. Doors 7 hinged at the sides of the apparatus may close the annular space around the track D and one door may carry a catch engaging the rod 54 to prevent its being opened until the shrinkage correction has been cancelled.