Patent GB-182467-A (GB)
Title: Improved method and apparatus for printing cinematographic films
IPC: G03B27/08
Filed: 1922-06-27
Abstract: 182,467. PathÚ Cinema, Anciens Etablissements PathÚ FrÞres, (Assignees of Salins, G. A.). July 1, 1921, [Convention date]. Kinematographic picture films; printing-apparatus.-In apparatus in which a positive film is directly obtained having titles different from the titles on the original negative film, for example, translations of the titles in a foreign language, the superimposed negative and positive film are passed in front of an illuminated window which is obscured during the passage of the title parts, and the positive film and an auxiliary negative title film or like element are then passed in front of a second window through which light is transmitted only during the passage of the parts of the positive film left blank in the previous operation. In the form shown, the original negative film A, Fig. 4, and the blank positive film B are fed, by gearing driven from a shaft 1, through a gate 62 having a window F illuminated through a tube 211 by a lamp 200. On leaving the gate, the positive film B is fed through a gate 58, Fig. 3. against which may be swung a gate 84 through which may be fed the auxiliary negative title film C. A window F' in this gate is illuminated through a tube 207 by a lamp 201. In each lamp are two similar shutter devices, shown, for example, in the lamp 201 as comprising two rotary discs 77, 79. The disc 77 is keyed to a rotary shaft 75, and performs the usual operation in kinematographic shutters. The disc 79 has a semicircular aperture, and is frictionally mounted on the same shaft 75 so that, when unrestrained. it rotates with the disc 77, but may be arrested to cause either its apertured part or its opaque part to rest between the lamp and the window F'. The negative film has two series of notches along its edges, arranged at points commencing different portions of the film. The notches a to g, Fig. 15, co-operate with a spring-urged lever 115, Fig. 4, which is mounted near the film gate 62, and actuates any known device for varying the intensity of illumination of the lamp 200 to suit the density of the portion of film about to be fed. The notches h to k co-operate with a similar lever which, through an electromagnet 108, Fig. 6, operating a lever 118 adapted to engage diametrically opposed stops 78<b> on the shutter disc 78, permits this disc to turn through half a revolution and then arrests it. 'In this way the shutter may be caused to obscure the window F when the title parts t, t', t<2> of the film are passing the window F, and to permit the passage of light through it when the scene parts s, s<1>, s<2> are passing it. On leaving the film gate 62, the negative film A passes over a feed-wheel 14, Fig. 4, and thence around a roller 112 adjustable in position. A spring-urged lever 114 is mounted adjacent to the film to engage the notches h to k. The arrangement is such that when each notch reaches the lever 114, the corresponding portion of the positive film arrives opposite the window F'. The lever 114, through an electromagnet 107, Fig. 6, actuates the shutter disc 79 in the manner previously described for the lever 115 and disc 78, so that light is transmitted through the window F<1> when the title parts of the positive film are passing it, and cut off when the previously printed scene parts are passing it. The shaft 104, Fig. 3, which transmits the movement of the electromagnet 107 to the shutter disc 79, simultaneously operates mechanism which (1) swings the gate 84 on its pivot 205 to move the auxiliary title negative C towards or away from the positive film B passing through the gate 58, and (2) actuates a clutch to throw in or cut out the drive of the feed mechanism of the film C. Notches in the film C co-operate with a lever 117, Fig. 3, to actuate mechanism for regulating the intensity of illumination of the lamp 201 as in the case of the lever 115 and the lamp 200. The permanent titles on the negative film may be replaced by equivalent lengths of blackened film. The Specification as open to inspection under Sect. 91 (3) (a) comprises also (1) an arrangement of the apparatus whereby two films may be printed simultaneously; (2) an apparatus employing titles on plates fed by automatic means in conjunction with the lamp 201; and (3) an apparatus employing titles on pasteboard cards fed by automatic means, with a device for taking kinematographic views of the titles. This subject-matter does not appear in the Specification as accepted.