Patent GB-534063-A (GB)
Title: Improvements in or relating to photographic cameras
IPC: G03B19/04
Filed: 1939-12-22
Abstract: 534,063. Roll-film photographic cameras. KODAK, Ltd. Dec. 22, 1939, No. 32740. Convention date, Dec. 23, 1938. [Class 98 (i)] In a roll-film camera having spool chambers at each end of an exposure frame 12, the front plate 5 extends across the major portion of the camera front and is spaced from the spool chambers to provide a shutter chamber which extends substantially the whole length of the camera and accommodates a shutter assembly including shutter plates 28, 29 having rearwardly-extending members 33, 35, the edges of which lie adjacent the exposure frame to form a focal plane shutter. In the form shown the entire shutter mechanism is mounted on the front plate 5, to which is secured a plate 27<SP>1</SP> with flanges 27 in which the shutter plates slide, springs 30, 32 urging them to the right. The member 35 extending from the plate 28 is formed at the end with spaced flanges 36, between which the end 34 of the member 33 engages to form a light seal when the shutter is being set. The shutter is set by the action of winding the perforated film, which engages sprockets 68 and rotates a disc 68<SP>1</SP> carrying a pin 67 which during the rotation engages a lever 64 and causes it to oscillate a lever 60 pivoted at 61, which moves the plate 28 to the left by a pin and slot connection 80, 81. During this setting movement, the plate 29 is pushed to the left, the slit between the ends 34, 36 of the members 33, 35 being closed. At the end of the setting movement, Fig. 3, the plate 28 is latched by a lug 54 on it, which engages a shoulder 53 on a lever 48, and the plate 29 is latched by a lug 56 engaging a latch member 44 pivoted on a shaft 38, and shown separately in Fig. 6. Depression of the shutter release 52 rotates the lever 48 clockwise, Fig. 10, and unlatches the plate 28 which then moves to the right. During the movement the lug 54 engages a cam surface 55 on the end of a speedadjusting lever 26 which pivots about the shaft 38 and engages in a U-shaped portion 46 of the latch 44, so that the latch is turned anticlockwise together with the lever 26 and releases the plate 29. The width of the slit is adjusted by longitudinal movement of the lever 26, which varies the point at which the lug 54 strikes the surface 55. For this purpose the shaft 38 carries a gear rotatable by an external knob 23 and engaging a rack 42 formed on one edge of a slot in the lever 26. A speed scale carried by the lever 26 is visible through a window 24 in the camera front. For "bulb" exposures the lever 26 is moved to the extreme right-hand position, Fig. 3, in which a lug 78 on the lever 48 engages a shoulder on the end of the lever 26 as long as the release 52 is depressed, thus preventing the lug 54 on the plate 28 turning the lever to release the second plate. The film-winding mechanism is latched, after the film has been fed the correct distance, by a lever 72 which is engaged by the pin 67 on the disc 68<SP>1</SP> and turned so that its end engages a ratchet 70 on the winding spindle. The lever 72 is carried by an axially movable spindle 73 which is depressed when the release 52 is actuated, so moving the end of the lever from engagement with the pin 67 and allowing a spring 75 to rotate it to free the ratchet 70.