Patent GB-604681-A (GB)
Title: Improvements in photographic apparatus
IPC: G03B15/00
Filed: 1945-05-18
Abstract: 604,681. Photographic cameras. RABANIT, P. May 18, 1945, No. 12644. Convention date, Aug. 26, 1943. [Classes 97 (i) and 98 (i)] Apparatus for taking a'succession of pictures on light-sensitive paper or film strips and then cutting off the exposed length of the strip comprises hand-operated means for intermittently feeding the unexposed strip, exposing means operated from the drive for the intermittent feed mechanism, means for cutting off the exposed portion of the strip, after a predetermined number of exposures, also operated from the film driving mechanism, and a second handoperated means for driving continuously the cut strips into a light-tight receiver. As shown, a removable holder 3 for a roll of lightsensitive strip material is mounted on the top of the apparatus and the strip passes from a spool 4 over a tensioning device 5, 6 and then back over the roll of strip, leaving the holder over a roller, into a velvet lined channel and thence into a channel 7. The strip is fed by intermittently-gripping rollers 8 driven by a hand crank through two pinions which are mounted on the same axes as the rollers and one of which engages a ratchet to prevent reverse winding. A ground glass focussing screen and a magnifying glass may be arranged .behind the objective 13 which has an erecting prism in front of it, A cam 23 is mounted on a shaft driven from the pinions so that it completes one revolution for every six exposures made and has a follower roller 26 carried by a lever 24 which carries at its free end a knife 12 the lever being urged towards the cam by a spring 27. One end of a bell crank lever 28 makes a pin and slot connection with the lever 24 and the other end is joined by a connecting rod 31 to another bell crank lever 18 carrying at its free end the roller 17 which is normally separated from its companion 16. The sequence of operations performed is as follows. As the crank is rotated the strip is fed past the knife and exposed as it intermittently passes the objective and its shutter operated by a pinion driven from the pinions which simultaneously rotate the cam 23. At the end of the sixth exposure the roller 26 slips down the cam step causing the lever 24 to rock towards the front of the apparatus cutting the strip, the knife 12 forming a light-tight seal for the unexposed strip in the channel and bringing the roller 17 into contact with the exposed strip which is gripped between the rollers 16, 17. The feed of the unexposed strip is then stopped and the exposed strip is driven into the light-tight receiver by turning the crank 21 which drives the roller 16. Before making further exposures by operating the crank driving the gripping rollers the shutter may be opened by separate means and the objective focussed using the focusing screen. The Specification as open to inspection under Sect. 91 describes means for interlocking the drives for the unexposed and exposed strip and the movements of the knife, and improvements in the driving means for the exposed strip. This subject-matter does not appear in the Specification as accepted but appears in Specification 617,156.