Patent GB-335226-A (GB)
Title: Improvements in or relating to kinematograph apparatus
IPC: G03B15/08
Filed: 1929-03-15
Abstract: 335,226. Proszynski, K. de. March 15, 1929. Kinematograph apparatus.- In apparatus for producing or exhibiting images arranged in ranks on a broad film, the film or the lens being reciprocated in the direction of the image ranks and being also moved perpendicularly to the ranks at the end of each rank, means is provided to enable the images of one rank to be exhibited repeatedly, and to enable errors in the relation between the directions of feed to be corrected; the film and sprockets may be adapted to facilitate the correct placing of the film on the sprockets. As shown, the film passes from a container 110, through a gate 1, 1<1>, over sprockets 12, to a container 13. The sprockets are mounted on a tube 13 which slides upon a pinion-shaped shaft 11 to effect the feed in each rank, and the film is pressed on to them by shoes 48 carried by a frame 49 sliding in association with the sprockets on a rod 51 carried by an extension 112 of a door 111 of the container 110, the door being hinged on a rod 107. The tube 13 carries a rack 14 loosely connected to it by rings 15, and alternatively engaged by pawls 16, 17 to effect movements in opposite directions. The pawls 16, 17 are respectively pivoted at 16<a>, 17<a> on levers 18, 19, themselves pivoted respectively at 23, 22, and carrying rollers 27, 28 engaging cams 25, 26 on a shaft 10 to rock the levers and reciprocate the pawls. The pawls are rocked about the pivots 16<a>, 17<a>, at the end of each sliding movement of the tube 13, and so change their engagement with the rack, by a lever 32 pivoted at 33 and carrying a roller 34 engaging a cam 36 on a shaft 70. The pinion-shaped shaft 11 is rotated, during the change movement for the pawls 16, 17, so as to turn the sprockets 12 and feed a new picture rank into register with the gate apertures, by means of ratchet wheels 40<1>, 40<11> engaged by a pawl 41 pivoted at 97 on a lever 42 pivoted at 43 and rocked by a cam 44 on the shaft 10. The teeth on the ratchet wheels are relatively staggered, and the pawl 41 is moved by a lever 45, pivoted at 46 and rocked by a cam 47 on the shaft 70, so as to engage and turn one of the ratchet wheels after the movement of the tube 13 in one direction, and to engage and turn the other ratchet wheel after movement of the tube in the other direction. A manually-operated lever 89, pivoted at 85, engages the pawl 41 to lift it from engagement with both ratchet wheels when it is desired to project one rank of images repeatedly. The provision of the two ratchet wheels 40<1>, 40<11> with staggered teeth ensures that, when the lever 89 is replaced in its usual position to restart normal projection, the images are projected in correct sequence. A knob 56 enables the shaft 11 to be turned by hand. The shaft 10 carries a shutter 9 and is rotated through gears 82, 81 from a shaft 80 driven from a crank shaft 78 through bevel gears 75, 76. The shaft 70 is driven by gears 73, 74 from the shaft 80. The apparatus is enclosed in a casing 108 and is carried by frame members 101, 102 connected by rods 106, 107 and members 103, 104; a casing 105 encloses the shutter. Figs. 9 and 10 show means enabling errors in the relation between the two feed mechanisms to be corrected. The cam 36 is loosely mounted on the shaft 70, and is driven from the cam 47 by a pawl 130 engaging one of two diametrically-opposite pins 135, 135<1>, carried by it. A manually-operable lever 137 may be moved to disengage the pawl from a pin 135, so that the cam 36 may be held stationary by a spring 143 during a half-revolution of the cam 47, the pawl 130 being then allowed to engage the pin 135<1>. The film may have square and rectangular perforations in alternation, one perforation to each two ranks of images, or normal perforations and additional perforations, notches, or marks; the sprockets are provided with corresponding teeth or marks to facilitate the correct placing of the film upon them. A form of bayonet-joint is described for the connection between the extension 112 and a lamp fitting for use in projection. Specifications 335,891 and 336,197 are referred to.