Patent GB-219302-A (GB)
Title: Machine for the colouring of cinematographic films
IPC: G03D15/00
Filed: 1924-07-07
Abstract: 219,302. PathÚ CinÚma, Anciens Etablissements PathÚ FrÞres. July 21, 1923. [Convention date]. Colouring; continous apparatus for colouring kine-matograph f;lm with different colours comprises a series of colouring-rollers, one for each colour, which are automatically moved towards or from the film by means controlled by the film itself or operating in synchronism therewith. In one fcrm of apparatus employing eight colours the film is carried round eight contact wheels a<1>, a<2> . . and colouring-drums b<1>, b<2> . . in alternation each drum being disposed over a smooth colouring- roller partially immersed in a colour trough 14, Fig. 8. The roller is mounted at the end of a lever 15 adapted to be rocked about a shaft 16 by the engagement of a stud 17 at its other end with a cam 18. In the position shown half a revolution of the earn causes the roller to be brought at first very close to the film owing to the boss 30 and then to be held at a slightly greater distance away from it, the first movement commencing the colouring action which takes place by capillarity. A continuously rotating disc 23, Fig.10, is provided at the end of a shaft 22 normally urged against a stop 28 by a spring 29, and contacts with a disc 21 on the same shaft as the colouring-roller to cause the roller to rotate before it reaches the film. The releasing-device imparting half a revolution to the cam when required comprises a continuously rotating ratchet wheel 44, a stationary cam 45 with a cut-out portion 45<1>, and a rotatable disc 48 to which is pivoted a pawl 49 which a spring 50 tends to separate from the ratchet teeth. A stud 51 is accommodated in the cut-out portion of the cam. When an electromagnet 57 is momentarily energized a lever 56 moves the pawl about its pivot 49' to release the stud and engage the ratchet teeth so that the disc 48 makes one revolution, being brought to rest when the stud drops into the cut-out portion releasing the pawl. The shaft. upon which the disc is mounted carries bevel gearing 52, Fig. 8, which imparts motion to the shaft 54<b> of a pinion 54 and through a pinion 55 of twice the diameter to the cam 18. Thus the cam moves half a revolution and so brings the colouring-roller into or out of operation whenever the electromagnet is closed through the agency of a pair of perforations in the film. Each contact wheel a', a<2> .. is made of ebonite or other insulating substance and has a number of radial slots separated at the circumference by a distance equa] to the depth of a film image, two fevers 68, 68<1>, being disposed in each slot, the pointed ends of which are adapted to enter the perforations, there being eight dispositions of the pairs of perforations according to the colour required. One perforation is situated on a longitudinal line X, Fig. 12, and the other may be on the lines A - - D and either on a common horizontal line separating two images or on the adjacent line. Thus the perforations m<1>, m, act in conjunction with the levers 68, 68<1>, of the contact wheel a' to close the circuit controlling an electromagnat 57 and so bring a colouring-roller into or out of operation beneath the drum b<1>. The lever 68 is riveted to a metallic lever 70, a contact arm 72 of which is urged towards a spring strip 77 by a spring 73 and contacts therewith when the lever point 69 enters a perforation in the film and the lever 70 enters a cut-out portion of a stationary cam 75. The lever 68 is withdrawn before the film leaves the wheel by means of the cam. The lever 68<1> is similarly operated and owing to the springs 77, 77<1>, being in electrical contact the circuit is closed by means of the pair of perforations. The circuits in the wheels a<2>, a<3> .. are respectively adapted to be closed by the remaining pairs of perforations for controlling the colouring rollers under the drums b<2>, b<2> .. Instead of perforations, notches, metallic contacts or other auxiliary elements may be employed not necessarily on the lines separating the film images. The colouring matter may consist of aniline &c. dissolved in water, alcohol, ether or gelatinous solution, or incorporated with a varnish having a basis of celluloid, acetate of cellulose, gum arabic &c. The trough is so disposed as to keep the gelatine in liquid condition, the film afterwards passing through a cooling sheath.