Patent GB-191411829-A (GB)
Title: Improvements in or relating to Moving Picture Apparatus.
Inventor: DICKER STANLEY GORDON SINCLAIR
IPC: G03B15/08
Filed: 1914-05-13
Granted: 1915-02-11
Abstract: 11,829. Dicker, S. G. S., [Ad-Display Machine Corporation]. May 13. Optical - projection apparatus; kinematograph apparatus.-An apparatus for producing moving- picture effects from transparent composite picture plate members and fine line screen members of the kind described in Specification 12,419/11 comprises an intermittently rotating table or drum 14 provided with radial guides 13 for receiving the composite slides, means for moving the slides successively into and out of a box 40 at the display point, and means for moving the picture and screen members relatively to one another while in the display position. Each slide is mounted in a carriage 16 which is provided with a roller 16<a> engaging a slot in the table 14. A shaft 20 is driven by a continuously rotating motor-driven pinion 23 through a one-revolution clutch 24 operated by a pin at each revolution of a gear 32, which engages the pinion 23. During the revolution of the shaft 20, a crank - arm 19 reciprocates radially a fork 17 engaging the roller 16<a> on the carriage of the exposed slide. On the exposed slide reaching its retracted position, the crank-arm engages an arm 34 and operates a pawl and ratchetwheel device 35, 37 to move the table on a step. This movement brings the roller 16<a> of the next slide carriage into engagement with the fork 17 and causes a new slide to be projected into the box 40 for exposure. While exposed, one of the picture and screen members is moved relatively to the other by a spring-pressed rod 43 engaging a lever 44 pivoted to a post 41 on the box 40, the lower end of the lever being operated through rods 45, 47 and a post 46 by a cam 48 on the gear 32. During the retraction of the slide, the light is cut off by a pin on the gear 32 operating a knife switch controlling the lamp circuit, and the displaced slide member is restored to its initial position relatively to the other member by contacting with a fixed ring 49. A switch arm may, also be used to vary the resistance of the motor circuit to increase the speed of the machine during the retraction and projection of the slides. Fig. 12 shows a construction of slide consisting of one metal frame a, a<1> having the transparent member a' attached thereto by struck-out portions a<3>, and a second metal frame b slidable in the frames a, a<1> and having the transparent member b<2> attached to bent portions b<3>, d. The frame b is formed with ears g for engagement with the rod 43 and ring 49. Figs. 16 and 20 show a preferred construction of slide in which the transparent members h, i are mounted in flanged metal casings k, l, the longer member h being held slidably by a spring n, and the shorter member i being secured to the casing l by struck-out lugs m. The casings k, l are formed at each side with notches o through which a spring- pressed pin on the lever 44 and the restoring-ring 49 act to effect the relative movement of the exposed slide members. An additional notch may be provided on the left-hand side of the casings to allow the movable slide member to be displaced at a different speed. In another arrangement, a master screen mounted on the rod 43 is used instead of providing a separate screen for each picture member. The pawl 35 may be arranged to engage alternate teeth of the ratchet-wheel 37 so as to expose alternate slide members only. The ratchet-wheel 37 may be dispensed with, and the edge of the table 14 formed with notches engaged by a pawl on a lever actuated by the crank-arm 19. A guard is arranged beneath the table 14 to prevent movement of the slides if the machine is tilted. In a modified apparatus, instead of moving the slide members in the display position relatively to one another, the slide members are oscillated or inclined relative to the line of projection by means of a cam-operated bell-crank lever.