Patent GB-191503344-A (GB)
Title: Improvements in Motion Picture Printing Machines.
Inventor: LUBIN SIEGMUND
IPC: G03B27/08
Filed: 1915-03-02
Abstract: 3344. Lubin, S. March 2. Printing - apparatus. - Apparatus for printing kinematograph films comprising sections of different densities includes means operated automatically by the film, whereby, when each section is reached, a predetermined aperture is positioned in front of the printing- lamp to obtain the correct illumination for printing the particular section. A disk 88, Figs. 1 and 3, with a number of radial slots 89 is positioned in front of the printing- lamp, and each slot is masked by an aperture slide 91, the apertures 92 corresponding to the different sections of the film. This disk 88 is automatically stepped by mechanism controlled by slots 7<11> in the film, which are positioned to operate when there is a change of section. Means are also provided for stepping the disk 88 by hand and for holding the operating- mechanism in an inoperative position. The filmfeed mechanism includes a rotated disk 17 having a face-cam for reciprocating the yoke 21 and the claw block 24, Fig. 9, and an edge-cam 25 for synchronously moving the claws 26 into and out of engagement with the film. This edge-cam also controls the position of an arm 27, which has a roller 29 at one end pressed on to the cam-face by a spring 30, Fig. 7. The arm 27 is connected by a series of linkages with a short shoe 41 with toes 42, which ride over the perforations 7<1> of the film, but can enter the slots 7<11> in the film. This arm 27 also controls the position of a pivoted lever 73, which again controls the shaft 45 from which the stepping-mechanism for the apertured disk 88 is operated by a.connecting-rod 79, a double pawl 80, Fig. 8, and a pin disk 85 on the same shaft 86 as the disk 88. The shaft 45 carries a bell-crank 47, 48, Fig. 5, to the arm 47 of which is pivoted a rod 49 urged towards the arm 47 by a spring 50. During the printing of any section, this rod 49 is held away from the arm 47 by a plate 54, Fig. 6, and a spring latch 53. When a film section of different density passes under the toes 42, these toes drop into the slots 7<11> simultaneously with the registration of the offset part of the cam 25 with the roller 28, whereupon the spring 30 throws the lever 27. The roller 27<1> at the top of the lever 27 is moved from a notch 73<1> in the lever 73 to a point below a deeper notch 73<11>, thereby allowing the lever 73 to drop, and with it a pivoted arm 70, Fig. 5, carrying an assemblage of links 69, 68, 63 61, 59. In the lower position, the link 63 comes into the path of a face-cam 75 on the driving- pulley 18, which cam rocks the link 63, thereby retracting the catch 53 and releasing the arm 49. This arm is pulled by the spring 50 into the path of a roller pin 51 on the wheel 18, whereby the arm 49 and the shaft are rocked. The rocking of the shaft, as above explained, operates the stepping- pawl 80 and steps the disk 85 and the apertured disk 88. Another cam 52 on the wheel 18 immediately afterwards moves the arm 49 against the spring 50 into its inoperative position behind the catch 53 ; the edge-cam 25 retracts the roller 27<1> from under the notch 73<11> to a position under the notch 73', thereby also retracting the toes 42 and raising the lever 73 and the series of links 69, 68, 63, 61, 59, and thereby also moving the link 63 into an inoperative position relatively to the cam 75. To step the apertured disk 88 by hand, there is provided a hand-lever 95 which directly operates the shaft 45 through links 96, 97, 48, and a duplicate indicator dial 101, showing which aperture is in operation, is actuated automatically in the disk 88 from the shaft 45 through links 48, 97, 96, 98. To put the disk mechanism out of operation, a pawl 43 is moved to hold the link 31, and thereby hold the other mechanism in inoperative position.