Patent GB-513738-A (GB)
Title: Improvements in or relating to roll film cameras
IPC: G03B19/04
Filed: 1938-04-19
Abstract: 513,738. Roll-film cameras. KODAK, Ltd. April 19, 1938, Nos. 11696 and 11697. Convention dates, April 17, 1937, and Feb. 1, 1938. [Class 98 (i)] A roll-film camera is provided with a hinged or detachable back portion 7 having a single actuating member 9, so that when the back is closed and coupled with film winding and/or shutter setting means, the film may be wound and/or the shutter set by the actuating member 9. The camera is of the kind normally held at eye-level. The member 9 is held in the position of rest by a spring 18, Fig. 6, which rotates it clockwise until a lug 23 extending through a slot 24 reaches the end of the slot. The shaft 14 is integral with a ratchet wheel 27, on which a toothed wheel 28 carrying the ratchet is freely rotatable in one direction but restrained by the ratchet in the opposite direction. These parts are all arranged on the camera back 7 below a spring-pressed plate 33 which presses the film against the exposure frame. When the camera back is closed, the wheel 28 meshes with wheel 40, Fig. 7, on shaft 41 carrying a film sprocket 42 which requires one rotation for each exposure. The shaft 41 also carries a ratchet wheel 44 which rotates only in a clockwise direction towards the film winding spool 47, which is driven through gearing 48, 49 by gear wheel 40. The rotation of the gear wheel 40 on actuating the member 9 thus winds the film and also the focal plane shutter curtains 50, 51. The latter operation is effected through gear wheels 55, 56, 58, 59, the last carrying a pin 60 on which a tripping latch 61, Fig. 8, is mounted. Normally the latch 61 is pressed by spring 62 into engagement with pin 63 carried by wheel 40, so that wheels 40, 59 rotate together when wheel 40 is actuated by member 9. A speed-setting disc 66, mounted outside the camera body, carries another disc 69 with cam slot 70 in which moves a pin 71 carried by lever 72 pivoted at 73 to a fixed support. Movement of disc 66 thus sets lever 72 which forms a stop for lever 74 pivoted at 75 on lever 76 which is pivoted at 77 to a support and carries a pin 78 engaging with a cam 79 carried by wheel 59. Shaft 41 also carries a cam 80, Fig. 9, engaged by a spring latch 81 when the shutter is set. Exposure is made by depressing a trigger 84, Fig. 8, which, by a wire 84' actuates lever 85, so that its projection 87 moves latch 61 away from pin 63 and disconnects wheels 40, 59. Wheel 59 then rotates once under pressure of the shutter springs, being stopped by a member 90. Pin 60 on wheel 59, which carries the latch 61, extends downward into the path of member 90. When the trigger 84 is actuated, latch 61 is freed from pin 63 and latch 81 from cam 80, so that wheel 59 is free to rotate clockwise until pin 60 reaches the opposite side of the upstanding, end of member 90 at the end of the shutter movement. When the shutter is re-wound by turning the handle 9, the path of pin 60 is reversed till cam 80 is re-engaged by latch 81. Winding of the film and setting of the shutter takes place without regard to the stroke of the handle 9, which is actuated until further movement is prevented by the stop 90, Fig. 9. Pictures may thus be taken in rapid succession. By omitting the appropriate parts of the mechanism, movement of the handle 9 could be used to wind the film only, or to set the shutter only.