Patent GB-300818-A (GB)
Title: Improvements in cinematographic apparatus
IPC: G03B33/00
Filed: 1927-12-21
Abstract: 300,818. Technicolor Motion Picture Corporation, Ball, J. A., Gallison, E. A., and Weaver, E. A. Dec. 21, 1927. Kinematograph apparatus. -In apparatus for bringing two perforated kinematograph films into registered contact for imbibition printing from a matrix film to a blank film, or for cementing the films together, the films are fed along converging paths and a retarding force is applied to both films conjointly in advance of their point of contact so that if either of the films has shrunk it receives the whole of the retarding force until it is stretched to conform to the other film, and then both films are subjected to the force. In the form shown in Fig. 1, the films 8, 9 pass over sprockets 10 which are fast together with their teeth in alignment and thence through a guide 17 to a drum 7 around which they pass in contact, a pressure roller 19 ensuring close contact of the films as soon as they reach the drum. Tapered pins 18 ensure registration of the films during their passage around the drum. On leaving the drum the films pass through a guide 23 and over rollers 24 to sprockets 25 which are also fast together with their teeth in alignment. The drums 25 are driven by suitable means and a retarding force is applied to the film by braking the rollers 10 by means of a disc 11 fast with the sprockets which is pressed against a stationary disc 12 by a spring 14. The pins 18 instead of being mounted around the periphery of the drum 7 may be mounted on resilient arms radiating from the hub of the drum so that they can move circumferentially to accommodate inequalities in the spacing of the film perforations. Additional rollers may be provided between the rollers 10 and the drum and one of these may be arranged to apply dye or cement to one of the films. The form shown in Fig. 6 provides means for positively moving the registering pins to stretch the films at the commencement of their travel round the registering drum 7<c> before pressure is applied by the roller 50. Each pair of pins 58 is mounted on a bar 59, Fig. 8, integral with an arm 60 pivoted at 61 on the drum. The pivot also passes through slots 63 in a frame 62 the open lower end of which bears on an extension 64 of the arm 60, which also supports a rod 65 passing into the frame and surrounded by a spring 67. The frame 62 has lugs 69, 70, Fig. 7, bearing on pins 71 on an arm 72 mounted on the pivot 61. The arm 72 has a roller 74 entering a cam-groove 57, Fig. 6, in a fixed plate 56. The shape of the groove is such that the roller 74 is moved by its engagement therewith to produce the necessary movement of the arm 60 about its pivot to cause the films to be stretched. After leaving the registering drum the films pass in contact around a plain drum 51 and then over a driving sprocket 52 from which they pass to winding drums 54, 55. In another form in which registration takes place entirely on the drum 7 the drum is provided with two sets of spokes, one set being pivoted at the centre of the drum and being weighted towards their outer ends and the other set being resiliently mounted. All the spokes terminate in registering pins and the members of the twosets alternate around the circumference of the drum. As each of the pivoted spokes moves towards the horizontal position the weight thereon tends to turn it about its pivot and a tensioning force is consequently applied to the films on the drum.