| 摘要 |
1,216,002. 002. Photographic cameras. EASTMAN KODAK CO. Jan.18, 1968 [Jan.18, 1967], No.2814/68. Heading G2A. A photographic camera has a film metering mechanism which comprises a metering pawl 48 for sensing successive metering holes 38 provided for each exposure area of a film 34 and a ratchet engaging tooth 71 movable between an operative position in which it disables the film advancing means and an inoperative position permitting film advance. The tooth is provided on a latch element 58 which also has a depending latch ear 62 which extends into the region of and may be held by a first latching surface 63 of a metering pawl support member;45 or a second latching surface 64 of a resilient tongue arm 46. Upon operation of the film wind at the position shown in Fig. 5, which shows the situation after an exposure, the edge of a film metering hole 38 cams metering pawl out of the hole and disengages the latch between surface 64 and ear 62, a forwardly projecting lug 57 flexing a tongue arm 56 of arm 46. Tooth 71 moves to an intermediate'position latched by engagement of ear 62 with surface 63. When metering pawl 48 enters the next hole in the film, the latch between ear 62 and surface 63 disengages to allow tooth 71 to reach its operative position to engage ratchet wheel 32. The mechanism is reset upon release of the shutter release by a return lever 116 engaging a depending return ear 117 on latch arm 58 to enable engagement of ear 62 with surface 64. A trigger blocking member 105 prevents double exposures, a nose portion 113 entering a hole 79 in trigger member 72. A linking member 65 coupled to latch element 58 rides over a cam surface 114 to rotate member 105 out of the blocking position upon latch element moving to arrest film movement. Shutter lever 18 is operated by actuation of push button shoe 75 coupled to trigger member 72 via shutter operating member 84 and an intermediate lever 89. |
