Patent GB-386442-A (GB)
Title: Improvements in and relating to reinforcing cinematograph films
IPC: G03D15/00
Filed: 1932-01-15
Abstract: 386,442. Perforating kinematograph films. ARMOURED FILMS, Ltd., Dorland House, Regent Street, London.-(Assignees of Pedersen, N.; 533, N.11 Street, Philadelphia, U.S.A.) Jan. 15, 1932, No. 1255. Convention date, May 28, 1931. [Class 31 (ii).] Armoured film is produced byforming sprocketholes in the armour strip the same distance apart as the sprocket-holes in the developed film, using the latter as a pattern, and attaching the armour to the edge or edges of the film with the sprocket-holes coinciding. The machine effects all operations at three stations by movement of a single crosshead, feeding devices being provided between the stations. The electric driving motor has two-speed gearing, and a treadle-operated brake-clutch device. A footage-counter for the film is provided. The film passes from a spool in a fireproof box through a tube into the machine, and thence through a tube 112, Fig. 10, into a similar box 113 having fireproof rollers 114. The take-up spool has a shaft 117 keying into the hub, on which are fast-and-loose friction discs 118, 119 pressed by spring 115 against disc 116, the disc 119 having ratchet teeth coacting with a pawl on an arm secured to which is a spring- urged rod actuated to turn the spool at each crosshead-reciprocation. Stop mechanism comprises film-engaging fibre rollers on a spring- urged bell-crank lever, the other end of which holds a spring-urged rotatable fibre disc so that a metal insert bridges contacts in the motor circuit. As shown in Fig. 6, the feed mechanism comprises a fixed plate 155 and movable plates 153, 154 secured to studs 156 urged upward by springs 159. Plugs 162, on pivoted arms 160 forked to engage studs 156, coact with cams 163 on a shaft 164 provided with a lever 165 having a cam surface 166 engaged by a surface 167. A roller 170 rotatably mounted on the rocking frame 150 is engaged by the forked arm 172 fast on shaft 173, secured to which is an arm 174 alternately engaged by studs 175, 176. The travel of frame 150, which is engaged by a spring-pressed friction drag is limited by coaction of a rib with rockable eccentrics. Feeding is stopped by holding down a lever on shaft 164 by a screw. The mechanism at station 1 comprises, as shown in Figs. 12 and 17, a block 200 in which is a block 206 on which is a die-block 210 having film pilot-pin holes 213, armour sprocket-hole and rivet-protuberance punch-holes 214, 215 respectively, and shiftable armour pilot-pin holes 217. The die-block may be adjusted after regrinding by raising the block 206 into engagement with top-plate 220 by screws 224 and wedges 223. The film is damped by spring-pressed plate 226 also acted on by spring plungers on descent of the punch assembly. The armour strips are clamped by plates 235. The punches comprise adjustable armour sprocket-hole punches 240, armour rivet-protuberance punches 243, film rivet-hole punches (not shown) spaced behind the fixed film pilot-pins (not shown) by the same distance as punches 243 from punches 240, and transversely aligned and rigidly joined shiftable film and armour pilot-pins 252, 254. The fixed pilot-pins enter the sprocket-holes before the clamping, and match each armour strip with the corresponding side of the film, but the shiftable pilots may be yoked together by the plate 255. The punch and die assemblies are aligned by co-operating pins and sockets. In the mechanism at station 2, Fig. 18, pilot-pins 260 assemble the strips, the spring-pressed plate 261 descends with the upper block 263, while the spring-pressed plate 262 on block 264 ascends a limited distance, so that the strips are clamped and impaled on the punches 266 to form rivets clinched by punch 267, Fig. 19, adjustable by block 272. Coacting pins and sockets align the blocks. The starting pilot 270 may be lowered by loosening screws 271. The mechanism at station 3, Fig. 20, comprises a spring-pressed clamp 275, an anvil 276, adjustable by screw 279, and a hammer 277.