Patent GB-396697-A (GB)
Title: Improvements in or relating to photographic cameras
IPC: G03B17/50
Filed: 1932-02-03
Abstract: 396,697. Photographic magazine cameras. MOORE, H., MOORE, H., and McOWAN, W., 103, Dale Street, Liverpool. Feb. 3, 1932, No. 3161. [Class 98 (i).] In a camera in which a number of sensitized elements (plates, cards, films, ferrotypes), arranged in a pack for daylight loading, are housed in a magazine in the back of the camera, and are adapted to be exposed in succession, a changing device is provided in which the front element and the rest of the pack are brought out of register with each other by relative movement in a plane perpendicular to the optical axis of the camera, and are then spaced apart in a direction parallel to the optical axis so that the front element is free to fall out of the focal position, e.g. into a developing tank or storage receptacle. As shown, the pack 5 is housed in a box 4 carried by a disc 2 having a circular flange 6 slidably fitting in light-tight manner into a circular flange 7 on a disc 3 rotatably mounted in an octagonal frame-like member 29, which is secured to the back of the camera body 1, and is fitted with a doubleflanged light-trapping ring 34. A spring-urged pressure-plate 27 carried by the removable lid 22 of the box 4 presses the pack forwards against a focal window 19 in the disc 3, so that the front element of the pack rests in recesses 23 formed in the margins round the window, the depth of the recesses being sufficient to accommodate one element only. Pins 9 on the disc 2 working in arcuate slots 11 in the disc 3 permit the disc 2 to be rotated relatively to the disc 3 through a limited angle, the disc 3 being held against rotation in the member 29 by a spring plunger 43 engaging a hole in the flange 7. This is the first operation in the changing movement, and during the rotation, the front element is held against rotation in the recessed margin 23, while the rest of the pack rotates with the disc 2. On the disc 3 are provided two pressure members 15, which pass through slots 16 in the disc 3, and are carried by a bar 14 which slides on pins 13 on the disc 3 and is urged towards the disc by springs 17 ; these pressure members engage over diagonally-opposite corners of the rest of the pack towards the end of the rotation of the disc 2, and press it rearwards. When the heads of the bolts 9 reach the ends of the slots 11, they are free to pass through the enlargements 12, whereupon the pressure members 15 move the disc 2 with the rest of the pack rearwardly away from the front element, so that this is free to fall through a slot 28 into a developing tank 41 (which may be of the double-compartment type rotatable about a vertical axis. 49), or a storage receptacle. To guide the element in its fall, two additional members 18, projecting through slots in the disc 3 may be provided on the bars 14. The parts are restored to their initial positions by pressing the disc 2 forwards until the heads of the pins 9 pass through the ends 12 of the slots 11, and turning the disc 2 until the pins 9 reach the other ends of the slots 11. The new front element of the pack then registers with the focal window 19 and enters the recessed margin 23. When the magazine is empty, warning is given by the pressure plate 27 entering the focal window 19 to an extent limited by lugs 60, and preventing relative rotation of the discs. If it is desired to set the back of the camera to take horizontal views, the discs 2, 3 may be turned together through 90‹ after their flanges 6, 7 have been looked together by a spring pin 44 normally held depressed by the opposing spring pin 43, but released when this spring is manually retracted. Stops 35 on the disc 3 co-operate with stops 64 on the member 29 to arrest the discs in the respective positions for horizontal or vertical views. The base-plate 40 which supports the camera body and the tank 41 may be provided with lugs 47 to take tripod legs, and with a hinged lid 48 giving access to the tank. To ensure that the pack 5 shall not be inserted in the magazine 4 back to front, it is made with a cut-away corner, and a corresponding flat 59, Fig. 4 (not shown), is made in the corresponding corner of the magazine.