| 摘要 |
PURPOSE:To enable a winding action by making a one-cycle action such that an open blade is carried from the second position to the first position and a closed blade vice versa both resisting respective restoring force and thereafter said blades are returned to respective initial positions through an intermediate position. CONSTITUTION:The blade-action controlling device for focal plane shutter is positioned movably between the first position to close an aperture and the second position to open the aperture. The one cycle is made such that the open blade is carried from its initial position where it is made movable from the first position to the second one while the closed blade is carried from its initial position where it is made movable from the second position to the first one through respective intermediate position where the open blade is made movable from the second position to the first one while the closed blade is from the first position to the second one, and further to respective initial positions. An open-blade driving lever 1 and a closed-blade driving lever 4 are attracted by respective electric magnets 18 when they come to a set-completing position being driven by a motor M. Consequently, the levers respectively move to and held at the first position to close the aperture, then move to and held at the second position to open the aperture. In such a way, the winking action is executed.
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