Patent GB-946160-A (GB)
Title: A between-lens shutter for single-lens reflex cameras
IPC: G03B9/22
Filed: 1961-10-12
Abstract: 946,160. Photographic camera shutters. CARL ZEISS-STIFTUNG, and A. H. LOMB, [trading as COMPUR-WERK FRIEDRICH DECKEL oHG]. Oct. 12, 1961 [Nov. 30, 1960], No. 36715/61. Heading G2A. A between-lens shutter for a single lens reflex camera comprises double-ended shutter blades having a driving ring connected to a spring- driven element and rotatable unidirectionally about the optical axis by said driving element during an exposure movement, said connection between the ring and the element being arranged to disengage after shutter exposure movement and said ring being arranged to then return independently of the element to a position corresponding to the open position of the shutter blades. In the embodiment shown, a reflex camera comprises a mirror 158 with a flap 156 controlled by a pinion 110 and rack 112, and shutter blades 14 pivotally mounted at 16 and controlled by a ring 12. Assuming that the shutter control parts are tensioned and loaded, depression on the release knob 144 causes a lever 134 to rotate and free driving disc 122, which is spring driven clockwise until lug 124 engages the locking edge of pawl 134. During the rotation, pin 120 pushes rack 112 to the right by means of pawl 114 and then releases it. Rack 152 is also free to move to the right and through gears 150, 148 and lug 146 to release shaft 46. Movement of rack 112 causes mirror 158 and flap 156 to be swung out of position, and through gear 110, shaft 104 and its extraction shaft 60 control disc 58 is caused to rotate. As disc 58 rotates clockwise it engages arm 80a of lever 80 and rotates it anticlockwise so that arm 80b engages pin 78 on ring 12 which rotates to close the blades 14, the ring 12 then being latched by claw 30 of element 28 engaging pin 31. Further rotation of disc 58 causes its pin 68 to release lever 86 which rotates anti clockwise so that lug 94 is not in the path of pin 31. Lug 66 on disc 66 then rotates pawl 52 anti clockwise to free the shutter drive locking tooth 48. Simultaneously pawl 96 locks disc 58 against its return movement under force of spring 64 when rack 114 is released. The release of tooth 48 allows element 22 to rotate clockwise under force of spring 36 until an edge encounters pin 38 and pawl 28 on element 22 rotates ring 12 anticlockwise to open and close blades 14 and pin 78 by engaging arm 102 of pawl 96 forces it to rotate and free disc 58 which rotates anticlockwise. At this stage rack 112 is moved by spring 64 to move mirror 158 and trap 156 into the position shown. Lug 68 then rotates lever 86 clockwise which through lugs 94, 32 rotates coupling element 28 and frees ring 12. Tooth 70 on disc 58 then rotates lever 74 anticlockwise which by engagement with pin 78 rotates ring 12 clockwise and opens shutter blades. Lug 66 then releases pawl 52 for engagement behind tooth 48. The shutter parts are tensioned by rotating lever 132 clockwise which through gears causes disc 122 to rotate anticlockwise and pin 120 thereon moves rack 152 to the left which causes gear wheel 148 to rotate together with shaft tensioning finger 146.