Patent GB-205250-A (GB)
Title: Apparatus for the intermittent projection of mutoscope pictures and solid objects
IPC: G03B23/12
Filed: 1922-07-28
Abstract: 205,250. M÷ller, C. Gleerup-. July 28, 1922. Endless-chain and like carriers, apparatus with; illumination, changing advertisements by controlling; optical apparatus, applications of; optical-projection apparatus, applications of; actuating.-In kinematograph apparatus of the type in which the pictures are carried on separate sheets, means are provided for automatically arresting the movement of the member carrying the picture sheets for a predetermined period so that one picture may be continuously displayed; the apparatus may be combined with means for displaying other changeable or fixed pictures or objects in alternation with the kinematograph pictures, and may be used for advertising. As shown in Fig. 2, the casing 1 contains a lens 8 which projects the pictures on the sheets 19 on to a ground glass screen 4 by reflection in a mirror 7. The images are viewed through an aperture 2 by reflexion in a transparent mirror 3, and a fixed or changeable picture or object 35 is arranged behind the mirror 3 so that when current is cut off from the projection lamp 9 and supplied to the lamp 32 the picture &c. 35 may be seen. Additional lamps 46 are provided behind advertisement or picture panels 45. The sheets 19 are mounted in links 11, Fig. 5, formed with side cheeks 13 the ends of which are cut at right angles to one another and provided with hooks 14 and eyes 15 carrying a rod engaged by the hooks. of the next link. The chain formed by the links is carried by a square roller or star wheel 20 so that as the star wheel is rotated the sheets carried by one link are exhibited after those of the preceding link without any intermediate gap. The sheets are engaged by a pivoted stop 21, Fig. 8, which is pressed by the sheets 19 into a position, shown in broken lines, in which a cam 25 on its shaft allows a switch in the circuit of the lamp 9 to close. Empty links may be provided in the chain, or gaps may be provided between the sheets, so that the pressure on the stop 21 may be periodically removed, the stop being then pressed by a spring into a position in which the cam allows a switch in the circuit of the lamp 32 to close, and opens the circuit of the lamp 9. Sheets 36, Figs. 8 and 10, carrying advertising or other matter may be interposed between the other sheets carried by the links, each of such sheets being metallic or carrying a metal rail which engages two contacts 37 carried by the stop 21 to complete a circuit 38 which short-circuits the motor 23 driving the star wheel 20, thus bringing the sheet to rest before the lens. The circuit 38 contains a movable switch arm 41 which is maintained in engagement with a contact 42' by a governor 43 driven by the motor. When the motor stops, the arm 41 moves out of engagement with the contact 42 and breaks the circuit 38, thus causing the motor to re-start. Clockwork 4.0 wound bv the motor determines the time during which each sheet 36 is exhibited. In a modification, Fig. 13, a turntable comprising shelves 54, 54' and radial partitions is mounted on a shaft 53 behind semitransparent panels 48, 48<1>. Articles may be placed in the compartments of the turntable and the advertising matter on the sheets 36 may relate to them. Means are described for automatically and intermittently rotating the turntable, and also for lighting the appropriate lamp 46 when a sheet 36 is being exhibited.