GB511061A - Device for conveying film in stereo-photographic apparatus - Google Patents

Abstract

511,061. Stereo photographic apparatus. GOLDLUST, W., and KARLBURGER, R. Feb. 12, 1938, No. 4487. Convention date, Feb. 13, 1937. [Class 98 (ii)] In stereo-photographic apparatus, the film feed is so regulated that the space between a pair of pictures a, a, is utilized for one (or more) pictures b of successive exposures and that when such space is filled the film movement is automatically increased to that necessary to bring an unused part c of the film into position. The film feed is effected by a hand knob 1, on a spindle 1<1>, carrying a collar 2, having flexible prongs 3, 4, projecting from it. Coupling discs 6, 12, each with a gear wheel 8, 13 are loose on the spindle 1<1> and are selectively locked to it by engagement of either prong 3 or 4, with a notch 3<1> or 4<1> in a disc 6 or 12 according as the prong 3 engages a fixed semicircular track 5 or the prong 4 a similar track 16. The transmission ratio of the gearing 8, 9, 10, 11, is such that in a half-revolution of the knob 1 the film drum 7 is fed forward three picture intervals, while in the succeeding half revolution the gearing 13, 14, 15 feeds the drum 7, one picture interval. Another construction embodies an axially-sliding clutch for engaging the alternative gears, and a further construction, for a picture sequence in which three pictures can be placed between the successive pairs of stereoscopic pictures, embodies means by which alternative intermediate gear wheels are brought into engagement.