GB751158A - A viewing device for viewing and editing movie films - Google Patents

Abstract

751,158. Kinematograph projectors. KALART CO., Inc. May 10, 1954 [June 29, 1953], No. 13548/54. Class 97(1). In a continuous feed film viewing device comprising a screen on to which an image is projected, there being reflectors and a shutter in the path of the projection beam, a switch for the projection lamp is openedwhen film guiding members are moved from film guiding to filmthreading position. In one form the projection apparatus shown in Fig. 8 is mounted on a baseboard on which are also mounted feed and take-up spools by the manual operation of the latter of which the film is fed through the projector. The spool mountings may be folded against the ends of the projector casing when not in use. The film 15 enters the projector between a roller 35 and a sprocket, not shown, and leaves between rollers 37 and 38. The film rotates the sprocket to drive through gearing, not shown, and optical compensating prism 120 mounted in a shutter 121. The shutter and prism are frictionally braked. The lamp 54 is enclosed in a heat shield 55 and the light which emerges through .the aperture 57 is reflected by a mirror 126 through a condenser, not shown, the film, the projection aperture 77 and the objective 124. The projection beam is successively reflected by mirrors 130, 131 and 132 on to the projection screen 17 in a hood 19. The mirrors are carried on a frame 133 secured to the base of the casing by screws 140 in holes 141, in the frame, slotted to provide adjustment. A screw in the back wall of tbe casing bears on the frame to flex it as the screw is adjusted to move the mirror 132 to centre the projected image. Details of the projection system proper are shown in Fig. 3. A fixed part 47 of the casing supports a bracket 45, carrying the lamp 54, the switch 60 in the lamp circuit, the heat shield 55 and a detachable frame 71. The frame 71 carries the lower gate member 75 and, on a pivot pin 84, a member 79 which carries the upper gate member 78 and the mirror 126. A downward projection 87 of the member 79 carries a pin 90 engaged by a pivoted latching lever 93 held in engagement therewith by a spring 100 but which may be released by a button 98. In the position shown the projection 87 holds the switch 60 closed. When the member 79 is released it is urged upwards by a spring on the pivot 84 to open the gate for film threading and open the switch 60. The roller 35 is carried on the member 79 and is simultaneously separated from the co-operating sprocket. Also, a pin 101 on the projection 87 actuates a pivoted lever, not shown, which carries the roller 38 to separate it from the roller 37. The member 79 carries the condenser lens, not shown, above the film gate, the projection lens, not'shown, being carried, below the gate, on the frame 71. The frame 71, together with the members carried on it, may be detached and replaced by one carrying alternative members for a different film size. A lever 110 is pivoted to'the member 79 and may be manually operated during the film run to mark the film for reference purposes.