Patent GB-380133-A (GB)
Title: Improvements in or relating to cinematographic picture taking and projecting machines
IPC: G03B33/00
Filed: 1931-06-12
Abstract: 380,133. Kinematograph apparatus. SOC. ITALIANA PER LA CINEMATOGRAFIA A COLORI NATURALI CI. CO. NA. ANON., 3, Piazza Eleonora Duse, Milan, Italy. June 12, 1931, No. 17060. Convention date, June 16, 1930. [Class 97 (i).] In apparatus for use with films of different types, and having intermittent feeding means adjustable for feeding different lengths of film, the gearing between the driving shaft and the intermittent feeding means has different gear ratios at different phases of revolution of the driving shaft ; the construction enables each feed movement to be completely masked by the normal shutter blade. As shown in Fig. 6, a driving shaft L drives, through gearing H, I, a sleeve G surrounding and turning a spindle E. Pin wheels C, D on the spindle E may be alternatively engaged with a maltese cross B on a sprocket spindle A by longitudinally adjusting the spindle E by means of an external button F. Longitudinal movement of f the spindle E also operates through a lever V to move connected gear wheels T, U along the shaft L and vary the gear ratio to a spindle Q driving the continuous-feed sprockets. The gearing H, I comprises, as shown in Fig. 7, a 90‹ sector H engaging a 180‹ sector I of half its diameter, and a 270‹ sector H<1> engaging a 180‹ sector 1<1> of one and a half times its diameter; a fork y is engaged by a pin z to ensure proper meshing of the sectors. Film feeding occurs during engagement of the sectors H, I, and takes place within the time taken by the shaft L to make a quarter revolution. The pin wheels C, D are respectively provided with two pins spaced 90‹ apart and with one pin, so that the film is fed two image spaces when the wheel C is operative, and one space when the wheel D is operative. The feed sprocket is a double-width four-picture sprocket having four pins per picture on its outer rims and one pin per picture on its middle rim. An alternative construction of apparatus is described in which a double-width eight-picture sprocket is rotated alternatively by a pin wheel engaging a cross having eight slots, or by another pin wheel engaging a cross having four slots, the construction being otherwise as shown in Fig. 6. The apparatus may be used for single-width films, for double-width films having images of double width, or for double-width films having stereoscopic pairs of images, three or four colour-record images in two ranks, &c. The Specification as open to inspection under Sect. 91 (3) (a) describes also a construction of gate adjustable to suit different films. Figs. 16 (Cancelled) and 17 (Cancelled) show a gate member S having a double-width aperture of double picture height, to which a removable member, Fig. 18 (Cancelled), having centre partitions d, may be secured when the film has three or four normal-sized images, and removed when the film has double-width images. Means enabling the partition on the member S to be removed is also shown. The other gate member comprises an edge guide for a single-width film capable of being moved into operative or inoperative position. This subject-matter does not appear in the Specification as accepted.