Patent GB-435014-A (GB)
Title: Magazine camera
IPC: G03B17/34
Filed: 1935-02-15
Abstract: 435,014. Photographic cameras. LAURITZ, T., 11342, Santa Monica Boulevard, West Los Angeles, U.S.A. Feb. 15, 1935, No. 4986. [Class 98 (i)] A magazine camera back for use with cut film has a stack of films compressed against a front wall, and a reciprocating slide member which transfers the front exposed film away from the stack into an auxiliary chamber and on its return movement transfers the spacer, which previously was at the rear of the front film, away from the stack in the opposite direction and into another auxiliary chamber. The removable back 3 comprises a front wall 7 and an inner wall 11, a focal plane shutter 10 and slide 13 being disposed between these walls. A stack of films 15 is held against the inner wall 11 by a pressure plate 16 and spring 18, the films being separated by spacers 19, which are of greater length and less width than the films. A locking post 22 secures and guides the films and is integral with a movable gate 23 which uncovers a discharge aperture 24 through which the films move into the compartment 26. This compartment 26 may have its end wall 30 removable and slidable in grooves 31 in the side walls 32, being secured in position by a cover plate 34 and catch 39. The front film 14 of the stack is moved into the compartment 26 by a pair of pusher arms 40 which have cleft ends 42 and are operated through a cross-head 43 and block 47 by a handle 49 outside the camera. In order that the front film 14 may be moved, the pressure of the stack must be relieved and the gate 23 raised. The gate 23 slides in slots 58 and is raised by lifter wedges which engage the rollers 56 and carry the gate clear of the film discharge aperture 24, simultaneously lifting the ends of the spacers, which rest on the shelf 61 of the gate 23. In addition, the film lifter wedges 62 are also moved by the cross-head 43 and pass behind the front film and lift the remainder of the films which are of greater width than the spacers. The front film is then pushed forward by the arms 40 and deflected by the springs 63, 64, into a position within the compartment 26, this being accomplished by a full forward stroke of the operating handle Upon the return movement, the front spacer is removed. At the commencement of the return, spring clips 65 with cleft ends 66 register with windows 71 in the spacer. The windows in successive spacers are staggered to prevent engagement with more than one spacer. Alternatively, each spacer may have a short piece of material secured to the rear of the window. The position of the gate is such that the front spacer is bent and released from the locking post 22 so that it can be moved toward the inclined tracks 72 and parallel tracks 73. Each spacer is moved underneath the pile of spacers in the compartment which have been raised by the cam 78, and is there retained by a spring 74 and cleat 75. At the same time the wedges 62, 59 are retracted and the films pressed forward again into a position for exposure. The complete operating stroke may also be obtained by a form of distant control employing a flexible cable and carriage (not shown). In order to prevent reversal of direction of motion of the carriage before the completion of a stroke, ratchet and pawl means are employed and controlled by leaf springs so that return movement is made impossible. The shutter action is also controlled by the movement of the handle 49. The shutter comprises a pair of curtains 97, 98 joined by a frame 99 defining a transverse slit 100. The shutter is set by movement of a carriage 103 bearing a catch 102 and connected to the crosshead 43 by a block105. A plate 107 is attached to the upper end of the carriage 103 and seals the exposure slit 100. As the carriage 103 is moved downwards, the shutter curtains 97, 98 and the plate 107 move with it past the exposure window 96 until the release plate 108 is reached. This plate urges forward the leaf spring 106 of the catch to release the shutter and effect the exposure by the spring 101 carrying the frame 99 back across the exposure window, the plate 107 being held by the carriage 103. The length of the exposure may be adjusted by varying the width of the slit 100 or the tension of the spring 101. A removable magazine which slides into and out of the camera may be employed in conjunction with the discharge slit 24 to receive the exposed films, slides closing the magazine and the slit during the removal of the magazine.