Patent GB-1032067-A (GB)
Title: Improvements in or relating to slide projectors
IPC: G03B23/04
Filed: 1963-08-27
Abstract: 1,032,067. Slide projectors. FRANKE & HEIDECKE G.m.b.H. [trading as ROLLEI-WERKE FRANK & HEIDECKE]. Aug. 27,1963 [Sept. 9, 1962; June 1,1963], No. 33861/63. Heading G2J. In a slide projector the slides are taken separately from the forward end of a stack placed on an inclined plane beneath the image gate, and are then conveyed vertically upward through the gate and finally returned by gravity through a chute to the rear of the stack, the foremost slide being gravitationally located for engagement by an upwardly and downwardly movable claw whose travel corresponds to the height of a slide. The image gate 4 has a front guide-way 5 and is extended downwardly by a guideway 7, which merges into an arcuate portion 17 along whose radius extends a guideway for magazine 8 with slides 9 and cover 19. The foremost slide is engaged through opening 10 by claw 13 mounted on the end of rocker member 14 which is coupled by link 12 to crank arm 11, the slides being driven up guideway 7 in a row one upon the other. On leaving gate 4, 5 each slide runs on to curved portion 6, tilts and slides down fixed shoot 15 to the rear of the magazine. An aperture 16 in the shoot is for the projection beam. Another embodiment has a shoot 21 pivoted about pin 22 so that its lower open end 23 which is slidable on shoot 21 can take up a position depending on the number of slides in stack 24. A pin or roller 28 on mouthpiece 23 slides in slot 26, 27 in the plate 30 attached to the projector, while the foremost slide is engaged by abutment 34 on one arm 33 of the bell crank lever pivoted at pin 31 on plate 30, the other arm 32 lying parallel to slot 26 when locked by spring latch 35. The magazine is removed from the projector by pulling it to the rear so that shoot 21 pivots anti-clockwise until pin 28 disengages latch 35 and enters recess 38 of arm 32. Spring 40 then swings arm 32 counterclockwise and recess 38 takes pin 28 into slot 27 thereby withdrawing pressure plate 25 from the path of the magazine. When a new magazine is inserted, its front engages lug 34 whereby lever 33, 32 is swung clockwise until the arrangement of Fig. 4 is restored. To allow the return of a slide from shoot 21 to the rear of the magazine, the shoot is moved a little counter-clockwise to provide space beneath pressure plate 25. For this purpose a non-rotatable pinion 45 engages rack 44 on a lever 43 pivoted about a pin 41 on plate 30 and displaceable in slot 42. Blocks 47 and 48 are fixed to lever 43, with a pin 49 between them carried on an extension 50 of claw arm 14. As claw 13 moves downwards arm 50 pivots anti-clockwise and lever 43 is shifted to the left and rotated clockwise by the inclined surface 51 on block 47 so that rack 44 disengages from pinion 45. The upward movement of claw 13 moves pin 49 away from surface 51 thereby permitting the rack and pinion to re-engage under the action of spring 46. The pin 49 then engages block 48 and moves lever 43 to the right, thus moving pin 28, and hence shoot 21, to the right to provide the necessary space under pressure pad 25. Block 48 has an arm 52 with a cam 53 which is engaged by the insertion of a new magazine to swing lever 43 clockwise so that pin 49 rides up and over surface 51 and the rack and pinion are held disengaged to permit pin 28 to move in slot 26. A guard is provided at the front of the magazine to permit the upward movement of the foremost slide only, the guard being operated by claw arm 14.