Patent GB-142204-A (GB)
Title: Apparatus for perforating cinematographic film
IPC: B26F1/00
Filed: 1919-02-05
Abstract: 142,204. Howell, A. S. Feb. 5, 1919. Reciprocating-punch machines. - Relates to machines for perforating the edges of kinematograph films, of the kind in which means are provided for ensuring a positive feeding-control of the film in its passage under the punching-ram, and is characterized by a particular arrangement of such feeding-means. The successive stages of the feeding and punching-means throughout one cycle of operations are shown in Figs. 13 - - 16. the passage of the film being from right to left. Eight holes, four on each edge of the film, are punched at each stroke of the ram by plungers 87. During the punching operation, and for a short period before and after, the paper is held in position (1) by the engagement of a series of pilot-pins 86, also mounted on the ram, with the previously punched holes, and (2) by means of a vertically reciprocating stripper-plate 90 operated by a separate lever 97, Fig. 3. As soon as the punches, pilot-pins and stripper have been raised from the film, this is carried forward by the engagement of fingers 114 on a shuttle 113 with the previously punched holes. The shuttle moves in a rectilined path, rising to engage the holes in the film, moving from right to left to feed the film forward, falling to release the film, and returning on the lower level ready to repeat the feed. The operation of the stripper and shuttle is effected by levers actuated by a common camdisk mounted on the main device-shaft 57, and their action is synchronized with that of the ram carrying the punches and pilots to effect the described cycle of events. The film passes from a spool 24, around rollers 27, 28, 30a, to the bed or carriage, where it comes under the punching and feed-control means described. Subsequently, it passes through a film-cleaning device E, and thence to the winding-spool 25. The machine is driven through a pulley 58, Fig. 1, mounted on the main shaft 57, which carries the cam-disk 102, and also operates the punching-ram. This shaft also drives cross-shafts through which the pulleys 28, 48, 51 are actuated; the pulley 51 is geared to the winding-spool 25. A cam-slot 101 in the disk 102, Fig. 3, raises and lowers the stripper-plate 90 through a bell-crank lever 97, 95 fulcrumed at 94. Another cam-slot 125 actuates an arm 123 mounted on a rock-shaft 121, thereby oscillating an arm 120 which traverses the shuttle 113 and sleeve 110 to and fro along the arm 111 to impart its feeding motion. At the ends of its traverse, the shuttle is independently raised and lowered to engage and free the film, by means of a bell-crank 128 actuated by a cam-slot 103. In order to permit of this compound movement, the oscillating arm 120 is connected to the shuttle 113 by a block 116 which is free to slide vertically in a slot in the shuttle body. The punching-ram is driven from the main shaft through the intermediary of a dumb-bell shaped link 72, Fig. 1, which, at its lower end, is connected eccentrically to the shaft, and at its upper end is connected eccentrically to the ram. By rotating the nut 81, Fig. 1, and releasing a set-screw 80, the upper eccentric can be rotated so as to adjust the initial position of the throw of the ram with respect to the die-plate 88.