Patent GB-973171-A (GB)
Title: Improvements in apparatus for the storage and projection of cinematographic film
Inventor: WOELFEL DONALD GEORGE
IPC: G03B21/32
Filed: 1962-06-28
Abstract: 973,171. Cinematograph apparatus. MPO VIDEOTRONICS Inc. June 28,1962, No. 24896/62. Heading G2E. In an interchangeable magazine and guide means for endless film, the film magazine comprises a turntable, a hub on the turntable, means on the hub releasably engageable with a spindle on a film projector to mount the turntable thereon and provide a driving connection there-between, the turntable serving to support a coil of film surrounding the hub, and a film housing comprising a top cover plate removably received on the said hub and having a downturned marginal flange surrounding the periphery of the turntable, the cover plate having a slot adjacent the centre for passage of one end of a film loop leading outwardly of the magazine from the centre of the coil, the flange having a slot for passage of the other end of the film loop leading inwardly of the magazine to the outside of the coil, the cover plate having openings therein, the guide means comprising a bar mounted on a substantially horizontal base plate attached to the projector for movement radially and axially of the magazine, a slide on the bar, and a downwardly extending film engaging guide roller on the slide, the guide roller projecting downwardly through one of the openings to engage the periphery of the film coil. As shown (Figs. 1 and 2), an interchangeable film magazine 13 for an endless coil 18 of film comprises a turntable 14 with a hub 15 having an aperture 16 for receiving a drive spindle 11. The film is coiled around a bushing 17 on the hub 15. A cover plate 19 with a side flange 20 is secured to the hub 15 by a nut 21 threadedly engaging the hub 15 and having a flange ring 21<1> overlying the central aperture in the cover plate 19. Film from the inside of the coil is led out through an arcuate slot 23 in the plate 19 and is fed back to the coil through a slot 28 in the flange 20. The base plate 10 (Figs. 4 and 6), on which the magazine is accommodated in the projector, is provided with a spindle 11 driven through belt and pulley means (Fig. 5 - not shown) and with three positioning lugs (Fig. 3 - not shown), the one at 32 (Fig. 4) having a slot 33 for receiving a lug 34 on the magazine for correctly orientating the same. Slots 35, 36 are provided in the plate 19 whereby two film guiding rollers 55, 58 may engage the periphery of the coil 18. The rollers are respectively mounted on slides 50, 52 on opposite ends of a bar 47 pivoted at 48 on an arm 45 which is pivotally mounted on a fixed post 39 and is capable of axial movement along the post against loading of a spring 41 (Fig. 5 - not shown). The slides are positioned by engaging two pins 56, 59 in suitable apertures of the series 37, 38, finger pieces 57, 60 being provided for facilitating this. The magazine may carry means for indicating which of the apertures should be engaged for the particular length of film therein. When changing a magazine, the rollers and pins are retracted therefrom and the arm 45 pivoted out of the way (as shown in dotted lines in Fig. 4) simply by manipulation of finger piece 46. Movement of the slides along the bar 47 is limited by stops 53, 54. In a modification (Figs. 12 and 14), the rollers 100, 111, on slides 98, 109, are mounted on bars 97, 108 hingedly connected and pivotally mounted on separate posts 94,105. Springs 98', 109' urge the bars downwards. The magazine is provided in this case with two staggered series of numbered apertures 90, 91 and 92, 93 through which the rollers pass to engage the film. The bars and slides may be provided respectively with a scale and index, the scale corresponding to the numbering of the apertures.