Patent GB-206682-A (GB)
Title: Improvements in kinematographs and like apparatus for producing effect of motion
IPC: G03B21/32
Filed: 1922-10-24
Abstract: 206,682. Cinechrome Instruments, Ltd., and Hillman, A. G. Oct. 24, 1922. Kinematograph apparatus. - In apparatus capable of projecting either a standard film or a broad film carrying a number of ranks of pictures, the various operations involved in the change over from the one kind of projection to the other are all effected by a master actuating-element through intermediate mechanical connections. The Figures show an apparatus for projecting either a standard black- and-white film or a double-width film with two ranks of pictures for two-colour projection. The master actuating-element comprises a shaft 1 connected by linkage 4, 4<a>, 5 to a hand-lever 2 pivoted on an axis 3 and movable over a quadrant 6, the two setting positions being determined by a stop 10 and notches 8, 9. The light-distributing and directing devices involved in two-colour projection are arranged in two groups, one carried in a slide 18 adjacent the condenser and the other in a slide 22 on the back of the film track 24. The colour filters through which the projection light passes ane carried by a frame 25 slidable vertically between guide bars 26. A pair of lenses 16, 17 for two-colour projection and a single lens 28 for black-and-white projection are carried by a fitting 29 carried by a plate 30 which can slide vertically in guides 31; the member 29 is also movable horizontally in the plate 30. The figures show the parts in position for two-colour projection. To change over to black-and-white projection the movements required are : (1) Adjustment of the lantern body to centralize the light, (2) removal of the light-distributing and directing means, (3) closure of one gate aperture, (4) removal of the colour filters, (5) insertion of a film guide adjacent the gate, (6) replacement of the lenses 16, 17 by the lens 28. These movements are all effected by the rotation of the shaft 1 produced by moving the lever 2 downwards until the plunger 10 enters the notch 9. The lantern body 20 is adjusted by the linkage 32, 33. The slide 18 is removed from the light path by the linkage 35, 36, 37, 37<a>. Removal of the slide 22 is effected by a segmental gear 38 on the axis 3 rotating a wheel 39 on a shaft 40 which carries a gear-wheel 41 engaging a rack 43 at the lower end of a bar 42 the upper end of which has a rack 44 which rotates a wheel 45 carrying an arm 46 which operates the slide 22. To close one gate aperture a pivoted shutter 48 is moved by a link 47 connecting it to the lever 2, to close one half of the aperture 49 in the heat shield 27. The colour filters are removed by a crank 50 on the lever 2, the crank pin 51 engaging a block 52 in a slot 53 in the frame 25. The film guide 55 is carried by a frame 54 which is moved by the slide 22. The lens fitting 29 is lowered to bring the lens 28 into position by links 56, 57 connecting it to the shaft 40. When short focus lenses are used the lenses 16, 17 are arranged in front of the lens 28 and the whole fitting is moved forwards at the same time as it is drawn downwards, by an incline 66 engaging a stop 66<a>. This forward movement prevents the lenses 16, 17 from fouling parts of the projector. During two-colour projection the colour filters are continuously reciprocated vertically by rotating the crank 50 by gearing 59, 61, 62 connecting it to a worm-wheel 63 on the shutter spindle. The wide film may be replaced by two films side by side, and the apparatus may be used for projecting stereoscopic pictures instead of the twocolour pictures referred to above.