Patent GB-651206-A (GB)
Title: Improvements in or relating to photographic cameras
IPC: G03B17/42
Filed: 1947-09-12
Abstract: 651,206. Photographic cameras. KODAK, Ltd. Sept. 12, 1947, No. 25023. Convention date, Sept. 14, 1946. [Class 98 (i)] A photographic camera of the kind having a camera bed which is hinged to the body and supports a shutter and shutter setting and releasing members, has a lever pivotally mounted on the bed and adapted to be turned in one direction to cause actuation of the setting member and in the opposite to cause actuation of the release, by the manual operation of the appropriate one of a pair of members slidably mounted in parallel relationship at positions remote from the shutter, the slidable member for effecting actuation of the release including a hook-like extension which abuts against the lever to turn it in a shutter-releasing direction and in the releasing position engages the foot of an L-shaped element on the lever to latch the slidable member in an inoperative position, this slidable member being unlatched upon setting the shutter by operation of the other slidable member. Preferably in a roll-film camera means are provided for preventing setting of the shutter until the film has been wound on after exposure. As shown, the shutter is controlled by a setting-button 33 and a release member 35 which engage shutter-actuating means comprising a lever 27 pivoted on the camera bed at 28 and a ring 18 having a projection 24 engaging within the flanged sides of the bent-up end 26 of the lever 27 and an arm 19 bearing lateral flanges which engage in turn the shutter trigger 22 and setting-lever 23. Fig. 2 shows the camera ready for an exposure. On depressing the release 35, which is slidably mounted on the hinge-pin 4 of the camera bed, against the action of spring 38, a shoulder 40 on an arm 39 of the release engages and rotates anticlockwise an L-shaped arm 42 on the lever 27 so that the arm 19 on the ring 18 trips the trigger 22. Simultaneously the end 43 of the arm 42 slips behind the crooked end 41 of the arm 39 holding the release depressed and inoperable, while the setting button 33 carried on a rod 31 slidably. mounted on the camera body and having an arm 30 engaging in the lever 27, is moved outwardly to its fullest extent by the spring 32. The shutter may then be set by depressing the button when the lever 27 moves clockwise to actuate the setting lever 23 and disengages the locking connection 41, 43 allowing the release 35 to return to its Fig. 2 position. On releasing the button 33 the cycle of operations is completed, the camera being ready for a further exposure and a latching engagement between the end faces of the members 41, 43 preventing a further depression of the setting button. In Fig. 1 the means just described is combined with means for preventing double or missed exposures, the cycle of operations being set shutter, wind film, and then release shutter. As shown, the shutter has been set, the modified setting button 33A being held depressed by the engagement with its flange 33B of a lug 55 on a lever 53, pin and slot mounted on the camera body, which is slid in the direction of the arrow and rotated clockwise against a spring 54 by the engagement of the flange 33B with a cam projection 65 on the lever 53. The setting button being held stationary, operation of this and the release is prevented. The film is wound on one frame as measured by a gear train 64, 63, 62 when an interrupted ring 60 carried by the gear 62 has completed one clockwise revolution. Thereupon the pawl end 59 of the lever 53, which rides on the ring 60 during winding, is moved by the spring 54 into engagement with the ratchetwheel 57 as shown in Fig. 1. Momentary further winding slides the lever 53 downwardly, winding then being prevented, and releases the setting button flange 33B from lug 55, the button 33A moving to the Fig. 2 position. As explained above the button 33 is still inoperable and the release 35 must then be operated. This is followed by setting the shutter to complete the cycle. Instead of being formed integrally with the lever 53 the lug 55 may be carried by an arm pivoted on the lever and spring-urged towards the setting button 33A and against a stop carried by the lever.