Patent GB-1485647-A (GB)
Title: Photographic camera
IPC: G03B17/42
Filed: 1974-11-12
Abstract: 1485647 Cameras CIMA KOGAKU CO Ltd 12 Nov 1974 [13 Nov 1973 22 Nov 1973] 49010/74 Heading G2A In a photographic camera a film take-up shaft 34 can be rotated by rotation of a manually operable lever 18 connected to the shaft 34 by a ratchet and pawl coupling means 36, 38 or automatically by a spring driven shaft 74 connected to the shaft 34 by a ratchet and pawl coupling means 42, 84. Rotation of the shaft 34 is transmitted to a sleeve 48 via gears 40, 66, 60, 62, 70, 68 and 44 and the sleeve 48 is frictionally engaged with a film take-up spool 50 whereby the latter is only rotated with the sleeve 48 if a lever 56 is moved out of engagement with a stepped cam disk 54 connected to the spool 50 via gears 52, 57, 55 and 46. A shutter release button 20 is depressible to move downwardly either or both of members 100, 102 the bottoms of which engage shutter mechanism (not shown), the button 20 being rotatable to three alternative positions in one of which it engages a fixed stop 112 to prevent inadvertent operation, in another of which it engages both of the members 100, 102 to operate the shutter and move the lever 56 out of engagement with the stepped cam disk 54 to permit the spool 50 to be rotated to take up the film by rotation of the shaft 34, and in the third of which it engages only the member 100 to operate the shutter without film take-up whereby a double exposure may be made, see Figs. 5A ... 5C (not shown). Downward movement of the member 102 moves a pivoted lever 122 clockwise whereby a spring- loaded lever 118 carried by the lever 122 engages a part 56c of the lever 56 and is moved anticlockwise until it passes over the part 56c. Upon release of the button 20 the lever 122 moves upwardly and the lever 118 disengages the lever 56 from the cam disk 54. The lever 56 also moves rectilinearly so that the part 56c moves out of the path of movement of the lever 118 and a part 56c' is positioned below an arm 102c on the lever 102 to prevent inadvertent downward movement of the lever 102 when film take-up is occuring. After one rotation of the cam disk 54 the step on it engages the end of the lever 56, see Figs. 4A ... 4C (not shown), to return it to its shown position and an arm 56a of the lever 56 re-engages a gear 94 which is connected to the shaft 74 via a gear train 92 and acts to prevent further rotation of the shaft 74 until again released by the next movement of the lever 56. A button 28 is provided on one end of a spring-loaded shaft 64 on which are mounted the gears 66, 68 whereby after the film has been exposed and a double exposure is required depression of the button 28 moves the shaft 64 axially and disengages the gears 66, 68 whereby the lever 18 can be turned to reset the shutter via the gear 40 (by means not shown) without the gear movement being transmitted to the sleeve 48. Sprockets 58a, 58b are interconnected by a part 58 and engage perforations on the film, and a slot 50a on the spool 50 receives the end of the film. The spring 78 which spring-loads the shaft 74 can be wound up by rotation of a knob 30 which is connected by a spring clutch 90 to a ring 76 surrounding the shaft 74, the ring 76 being connected to the shaft 74 by the spring 78. To prevent reverse rotation of the ring 76 by the wound-up spring 78 a second uni-directional spring clutch 86 is wound round the ring 76 and is fixed at its other end to the camera body.