Patent GB-674345-A (GB)
Title: Improvements in or relating to methods of and apparatus for registering similarly perforated strips such as kinematograph films
IPC: G03C7/22
Filed: 1950-01-02
Abstract: 674,345. Registering kinematograph films; colour photography. TECHNICOLOR MOTION PICTURE CORPORATION. Jan. 2, 1950 [Jan. 3, 1949], No. 34/50. Class 98 (ii). Kinematograph films are registered by means of their feed perforations by feeding them on to an endless pin belt, and in order to avoid appreciable relative movement of the films once they have been brought into contact, they are brought into substantially registered contact at a location adjacent a curved portion of the belt, and in alignment with a contiguous tangential straight portion of it, and are fed to the belt along a straight path in line with the straight portion of the belt, teeth on the convex face of the belt being inserted into the feed perforations as the films approach the straight portion to effect accurate registration. As shown, a perforated multilayer film 6, having three superposed emulsion layers separated by water-soluble and alcohol soluble adhesive stripping interlayers, the innermost emulsion being permanently bonded to the support, is fed from a supply spool 16 into a water tank 20 so as to soften the bond between the outermost and next adjacent emulsions, and a similarly perforated blank support film 10 is fed from a spool 17 into the tank 20 also so that it may swell to the same extent as the multilayer film. The two films are brought substantially into register between rollers 18 in the tank and are then fed out of the tank in a straight path 24 tangentially on to a pin belt 12 which is trained over sheaves 11 and on which the films are seated either tightly or with a small space between them and the belt by a roller 25 having marginal grooves to accommodate the belt pins at the point where the belt path is straight and collinear with the path 24. The two films leave the pin belt tangentially as it starts to pass round the second sheave and are then fed round a roller 26 to a drier 29 where the support film and transferred emulsion are stripped over rollers 27 from the multilayer film 6, the dried transfered emulsion film 10 being wound up on a spool 30. The dried multilayer film 6 is then fed with a second blank support film 34 from a spool 36 into an alcohol tank to soften the bond between the second and permanently-bonded emulsions and then to a second set of bonding, stripping and drying stations and a second dried transferred emulsion film 34 is wound up on a spool 47, while the film 6 with its remaining emulsion layer is wound up on a spool 46. Instead of seating rollers as 25, a perforated stainless steel seating belt 54 may be arranged to pass around rollers 56, 57, 58 and a stationary member 67, mounted on a block 59 capable of vertical movement against springs 64 to permit passage of film splices. The initial setting of the block 59, which is controlled by adjustable screw-pins 66, is such that the films are not pressed on to the roots of the belt pins but are spaced a small distance from the belt surface to avoid distortion of the emulsion by pressure around the sprocket holes. Reference has been directed by the Comptroller to Specification 629,032.