| 摘要 |
A focal plane shutter drive for simultaneously cocking and sequentially releasing the leading and trailing curtains of a focal plane shutter. One of a pair of coaxial curtain gears is formed with an arcuate slot while the other carries a pin received in this slot for engaging an end thereof to provide for simultaneous turning of both gears during cocking of the shutter. A cocking gear is coaxial with the curtain gears and all of the gears are supported for free rotation independently of each other about their common axis. A releasable motion transmission extends between the cocking gear and one of the curtain gears for transmitting motion therebetween during cocking of the shutter, this transmission being interrupted preparatory to sequential release of the curtain gears. This motion transmission is situated in its entirety between the common axis of the gears on the peripheries thereof so that an exceedingly compact, light-weight assembly is provided.
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