Patent GB-407969-A (GB)
Title: Improvements in or relating to cinematograph apparatus
IPC: G03B1/50
Filed: 1932-06-21
Abstract: 407,969. Kinematograph apparatus. COMMUNITY SERVICE, Ltd., 1, Montague Street, London, and FOSTER, W. D., 4, Wilsey Square, Ridgewood, New Jersey, U.S.A. June 21, 1932, No. 8651/34. Divided on 407,926. [Class 97 (i).] To adapt kinematograph taking, printing, or projection apparatus for handling films of different widths and requiring different extents of longitudinal travel, an adjustable gate is operatively associated with a number of different film feeding means so that adjustment of the gate to suit a particular film results in that film being fed by the appropriate feeding means. In the form shown, two continuously driven intermittent feeding means of the type described in Specification 407,926 are provided, the claw 220 for feeding the wider film projecting further towards the film gate than the claw 221 for the narrower film. The film gate comprises a section 201 which is longitudinally slidable in guides 202, 203 on the base 200 and a section 207 which is hinged thereto at 2091. The gate is provided with two different exposure apertures 208, 209 and appropriate co-operating lenses 213, 212. The film track in the gate is provided at the upper part with a spring urged plate serving as a pressure plate when wide film is being used and to define a narrow film track when narrow film is being used. The lower part of the film track is bent towards the feed mechanism as shown in Fig. 1 and is provided with a main pressure plate and an auxiliary spring pressed pressure plate mounted thereon so that film channels are formed in accordance with the requirements of the feeding operation. When wide film is being used the gate is in the position shown in Fig. 1 and the film is driven by the claw 220, the claw 221 failing to reach the film. When narrow film is being used, the gate is moved upwards to bring the offset portion of the gate opposite the feeding device, the film then being driven by the claw 221, whilst the claw 220 works inoperatively outside the margin of the film. The motor 228 driving the feeding mechanism may be controlled by a spring switch 265 operated by two abutments 269, 270 on the gate so that the motor is switched off whilst the gate is being moved. In the form shown in Fig. 7 the longitudinally movable gate 300 is provided with two side guide members (not shown) for the film which are mounted by pin and slot mechanism for equal inward or outward movement to define channels appropriate to the film being used. The film feeding mechanism comprises a sprocket having teeth 313 on outer flanges for engaging the wide film and teeth 314 on an inset central part for engaging the narrow film. A member, rotatable on the sprocket axle 312 and having a part 324 covering the teeth 314 when the teeth 313 are in use and a part 315 covering the teeth 313 when the teeth 314 are in use, is adapted to be rotated into the appropriate position by a rack 321 fixed to the gate engaging a pinion fixed to the member. The part 324 serves to strip the narrow film from the teeth 314 when adapting the apparatus for wide film and the part 315, which laps round the inner sides of the flanges on the sprocket forms a side guide for the narrow film. Abutments 332 and 333 on the gate are adapted to engage a lever 331 connected by links 335 to clutch mechanism controlling the drive of the sprocket as described in Specification 407,926.