Patent GB-1075651-A (GB)
Title: Photographic reflex camera
Inventor: STEISSLINGER KURT
IPC: G03B19/12
Filed: 1964-05-14
Abstract: 1,075,651. Photographic reflex cameras. EASTMAN KODAK CO. May 14, 1964, No.20056/64. Heading G2A. A single lens reflex camera including a shutter mechanism 12, a mirror 47 and a cover flap 45 both pivotably movable into and out of the path of light rays from the camera objective, further comprises means connecting a film-advancing mechanism to the shutter mechanism 12 and including a rack 8 and a first spring 5 tensionable on movement of the film advancing mechanism to advance the film and cock the shutter mechanism, the connecting means then being locked against return movement under the action of the spring 5; means releasably coupled to the rack 8 at 21a, 13c for moving the mirror and cover flap out of the light path, a camera release 22 upon operation of which the first spring 5 and the shutter 12 are released and a slide member 30 is moved against the action of a second spring 35 into a latched position; and finally a lever 14 operated by the shutter mechanism at the conclusion of an exposure to disengage the coupling means 21a, 13c and to release the slide member 30 which in its return movement co-operates with the mirror and cover flap moving means to move the mirror and cover flap back into the light path. The coupling means 21a, 13c comprises a projection 21a on an axially movable member 21 which is urged towards a gear 13 having a notch 13c. Movement of the rack 8 on completion of the film advance operation rotates the gear 13 to bring the projection 21a and notch 13c into register. The member 21 is coupled to a pinion 41b which engages a rack 34b carried by a slide 34. On operation of the camera release 22, the rack 8 moves in the direction of arrow C, causing the member 21 to rotate and thus the slide 34 to move down. During this movement the mirror and cover flap are moved out of the light path. A gear 42 coupled to the member 21 also rotates to close the shutter blades and close down the diaphragm to a pre-selected aperture. Towards completion of the movement of the rack 8 in the direction C the shutter 12 is released by a pinion 10, whereupon the film is exposed. Operation of the camera release 22 simultaneously moves the slide member 30 down against the spring 35. A lever 37 urged in an anticlockwise direction abuts a lug 30c on the slide 30 and thus locks it in position. At the conclusion of exposure of the film an actuating member 16 on the shutter 12 moves a lever 18 to release the lever 14 which then rotates in a clockwise direction, as shown in Fig. 1, under the action of a spring 15. Movement of the lever 14 rotates the lever 37 to release the slide 30 and simultaneously uncouples the member 21 and the gear 13 by means of a lug 14d on the lever 14 engaging a pin 40 carried by the member 21. The slide 30 returns to its initial position under the action of the spring 35, a lug 30a engaging a pin 34a to move the slide 34 upwards and so return the mirror and cover flap into the light path. In a further embodiment, Figs. 4, 5 (not shown), the slide 34 is replaced by a drum (50) mounted for rotation with the member 21 and having two peripheral grooves (50a), (50b) which receive pins on the ends of two-armed levers (43), (44), coupled to the mirror and cover flap. For return movement of the drum (50) to its initial position, a rack and pinion connection is provided between the slide 30 and the drum (50). In a modification Figs. 6, 7 (not shown) a worm (60) and wheel (61) are substituted for the drum (50), the wheel (61) having a cam track (61a) for receiving the pins of the two-armed levers, (43), (44).