Patent GB-274529-A (GB)
Title: Improvements in kinematograph spool cases and in connection therewith
IPC: G03B17/26
Filed: 1926-02-20
Abstract: 274,529. Thornton, J. E. Feb. 20, 1926. Kinematograph apparatus.-A spool case comprises two spools, two leader strips permanently secured to the spools and to the ends of a film, a toothed sprocket drum for feeding and positioning the film, and means whereby the drum may be driven continuously or intermittently in either direction, the case being provided with an opening or openings for connection with external driving means carried by a camera or projector, and with an exposure aperture. The case may have the drum B and exposure aperture a at one end. as shown in Fig. 1, the take-up reel D behind the drum, and the pay-out spool C behind the reel D; alternatively the positions of the reel and spool may be reversed, or the exposure aperture may be placed centrally in one of the long sides of the case, as shown in Fig. 12, the images being arranged on the film with their vertical lines either parallel to or transverse to the edges of the film. The case may be provided with a single-width film having one series of images, a single-width or double-width film having two series of images, one exhibited during each direction of feed, or with two single-width films having their images relatively inverted. The film drum B may draw the film directly from the payout spool C, or a pair of sprockets F, Fig. 1, or a single sprocket F<1>, Fig. 12, may be provided to feed the film from the spool to the drum, and from the drum to the reel. Idle rollers c, d, f. may be provided to guide the film or hold it to the drum B or sprockets F, F<1>. A frame G within the case may carry the spools and drum, and also a geneva mechanism, or toothed gearing for driving the drum, the driving shaft B<1> for the drum and the cores C<1>, D' of the spools being hollow and having crown teeth or other means to form a clutch connection with spindles carried by the camera or projector and extending within them. The spool case may be provided with one nr more sliding shutters covering the exposure apertures, and the drum may be large enough to contain a prism which reflects the light from an outside, lateral source through 90‹ to the film. or large enough to contain a lamp and condenser. The drum may have a series of flats, each the size of an image, or the flats may be omitted, a correcting lens, as described in Specification 272,256, being then employed. The spool and reel may be alternatively or simultaneously driven by mechanism, carried by the camera or projector, and of the type described in Specification 272,737, or such mechanism may be carried within the case. A construction is described wherein the spool or reel is driven by the camera &c., and an internal rubber-covered roller, held against both coils of film, drives the other reel or spool. The spool case may be stamped, drawn, or moulded, from sheet aluminium, bakelite, &c., and may be formed with tubular pillars to carry the spools etc.; it may comprise two shallow trays, fitting one over the other, and secured by secret means. The leader strips may be secured to the spool and reel in the manner described in Specification 272,737, and may be of paper, film, a double thickness of linen tape or parchmentized paper, or a linen tape with paper each side; they may be provided with means to prevent the film from being fed beyond such means. The spool and reel may be with or without flanges, and the case may be provided with a rotating drum shutter within the drum B, or with any other suitable form of intermittent shutter. The geneva mechanism may be replaced by a pair of ratchet pawls operating ratchet teeth and themselves operated by connecting-rods from a continuously rotating crank or eccentric discs. Specification 164,467 is referred to.