Focal plane shutter for camera

Claim 1

A focal plane shutter comprising, means defining a shutter aperture, a first set of shutter-opening blades closing the shutter aperture when the shutter is in a cocked condition, means pivotally mounting said first set of shutter-opening blades, shutter-opening mechanism having driving means for driving the first set of shutter-opening blades in a sequence for opening the shutter Aperture, a second set of shutter-closing blades, means pivotally mounting said set of shutter-closing blades, a shutterclosing mechanism having driving means for driving the second set of shutter-closing blades sequentially from a rest position to individual positions for jointly closing the shutter aperture, both driving means comprising separate means driving said sets of shutter-opening blades and said shutter-closing blade independently in a same direction, said shutter-opening mechanism and said shutter-closing mechanism each including a set of driving levers, said set of driving levers comprising a main driven lever moved in one direction and an auxiliary lever driven in an opposite direction by the main lever, means coupling the main and auxiliary levers in each set of driving levers, and means coactive with each respective main lever for driving the respective set of shutter blades, and means coactive with the auxiliary levers for driving one of said shutter blades of a respective set independently.