Patent GB-970063-A (GB)
Title: Motion picture projector
IPC: G03B21/02
Filed: 1961-02-21
Abstract: 970, 063. Kinematographic apparatus. CORDOVA Inc. Feb. 21, 1961 [March 2, 1960], No. 6375/61. Heading G2E. A kinematographic projector includes a removable reversible magazine 30 containing a feed sprocket 34 and a pair of spaced spools 33, 33a loosely and rotatably mounted within the magazine casing, when the magazine is not in position, for frictional engagement with the casing to prevent unreeling of the film, which always remains threaded over the feed sprocket and rollers carried in the magazine and passes through a film-gate 56 housed in a forward portion 30a of the magazine; this forward portion is provided with two projection apertures 53, 53a and apertures 55 for the entry of reflecting means carried by the projector for directing light from a light housing, and being guidably receivable by a shutter housing 25a, the magazine being also guidably supported by a guideway 28 in the projector base 21 and a vertical wall bearing ; retractable drive shafts 74, 74a and 75 extend from a drive housing and are adapted to enter the side-walls of magazine and drivingly engage the feed sprocket 34 and take-up spool, the front wall of the magazine being provided with sound pick-up apertures 58, 58a. As shown in Figs. 12 and 14 the forward portion 30a of the magazine slidably enters the housing 25a until bars 67a abut against the ends of slots 66, 66a, the bars 67a bearing on a resilient member 61 and so retracting registering pins 64 carried by member 61 and engaging central perforations in the film when the magazine is removed. Either of projection apertures 53 or 53a may be aligned with the projection axis, according to which way round the magazine is inserted, if the film is provided with opposite picture sequences and sound tracks. An additional 3-D lens may be provided on the projector as in Fig. 17 and both apertures used for a double-image stereoscopic film a prism 160 being adapted to enter aperture 55a and illuminate both apertures from two light sources. Otherwise a single reflector enters the magazine to illuminate one aperture using a single light source, a slidable light-shield being provided for the other aperture. Either slot 54 or 54a allows intermittent entry and withdrawal of a feed claw under the influence of cams carried by a rotating sector-bladed shutter 26 (Fig. 10) which also carries a triangular cam for up-and-down movement of the claw and is driven via a belt-and-pulley system by motor 85a further belts and pulleys driving shafts 74a and 75. These have knurled heads and are slidable along their axes to enter hollow trunnions 45, 45a (Fig. 5) formed in the magazine side wall. When the magazine is removed these trunnions loosely support recessed portions of the hub of the sprocket 34 (and feed spool 33a). Shaft 75 engages a cavity in the bearing portion 48 of the hub by means of lugs 78 resiliently urged outwards through slots in a hollow portion of shaft 75, a screw 81 bearing on resilient portion 79 and facilitating variation of the pressure on the lugs. There is a similar arrangement for shaft 74a. A sound pick-up head 95 (Fig. 4) bears on the film via aperture 58 in the region of a rotatable drum 36a in the magazine bearing against a flywheel (not shown) to reduce flutter of the film. A microswitch 105 stops the film feed before the film is completely wound off the feed-spool. Electronic gear and switches are carried in the base 21. In a preferred embodiment, a carrying case is provided having a built-in loud-speaker. Specification 913,124 is referred to.