Patent GB-714320-A (GB)
Title: Improvements in and relating to photographic reflex cameras
IPC: G03B17/42
Filed: 1952-12-10
Abstract: 714,320. Photographic reflex cameras. VOIGTLANDER AKT.-GES. Dec. 10, 1952 [Dec. 10, 1951], No. 31329/52. Class 98(1) A photographic single-lens reflex camera having coupled film-winding and shutter-setting mechanism is provided with a hand member (such as a knob) which actuates the film-winding and shutter-setting mechanism, and at the same time stresses a spring (or charges some other energy storing device), and also with additional mechanism actuated solely by the spring and set in action by a separate release device thereupon acting independently of the first mentioned mechanism and effecting a series of operations in three stages in succession, the first stage including closing the shutter, adjusting the diaphragm to a desired value, raising the mirror, and removing the cover flap from the image gate, thus bringing those parts needing to be moved before exposure to the position ready for exposure, the second stage including the release of the shutter to make the exposure, and the third stage including moving the cover flap over the image gate, lowering the mirror into rest or view-finding position, fully opening the diaphragm, and opening the shutter, thus bringing all the parts back into the rest position. As shown in Fig, 1, a knob 5 is journaled in a wall 2 of a photographic reflex camera, and encloses a spring 7 connected at one end to the knob and at the other end to a shaft 4 journaled in the knob and an internal wall 3. Knob 5 is fast with a ratchet wheel 13, engaged by a pawl 15, a wheel 17 driving the film winding spool, and a cam 24. Cam 24 has a slot 30, Fig. 3, engaged by a lug 31 on a lever 33 with a pivot 32 sliding in a slot 35. When the lever is rocked to lift lug 31 from slot 30, spring 34 pulls it back so that the lug rides on the periphery, so that knob 5 can be turned one revolution until the lug engages slot 30 again. A lever 25 resting on cam 24 is rocked to set the shutter 26, and at the same time the film is wound and spring 7 is stressed, shaft 4 being meanwhile held stationary by a locking member 47 which engages a slot in a disc 45 fast with shaft 4. The release 48, Fig. 4, carries a spring blade 69 with a projection 70 which engages a member 68 on a rod 67 fixed to the lever 65 carrying the projection 47. When release 48 is depressed, lever 65 is rocked, releasing shaft 4 which rotates until member 47, which is pressed against disc 45 as projection 70 springs past projection 68, reengages the slot. A lug 71 on blade 69 engages a slot 74 in a lever 73 so that the release cannot be actuated again until, during setting of the shutter a pin 76 on lever 25 (Fig. 3) rocks lever 73 to release lug 71. As shaft 4 rotates, wheel 40 drives a damping vane 44, Fig. 1, and a series of cams, 37, 49, 50, 51, 52 are turned, the cams engaging spring-urged levers, which effect various operations. First, the shutter blades held open for focusing, are closed by action of cam 49, and the iris diaphragm, also held open, is closed to a pre-determined extent by action of cam 50. Cam 51 raises the mirror, and cam 52 lifts a capping blade or flap from the film gate. Finally, the shutter is actuated for an exposure by cam 47. The parts are returned to their initial positions at the completion of a revolution of shaft 4. At the end of the revolution, a projection 38 on cam 37 strikes a projection 36 on lever 33 (Fig. 3) to raise lug 31 and to free knob 5 so that the film may be wound. A shaft 54, connected to delayed action shutter release mechanism, may be slid axially by a shaft 58 with lugs 59 to engage a wheel 55 thereon with a wheel 56 driven by wheel 40. When the mechanism is engaged, if release 48 is depressed a projection 62 thereon engages a projection 63 on shaft 58 to slide it to the left to disengage the delay mechanism.