Lens shutter actuating device for quick-return type single-lens reflex camera

In a lens shutter for a quick-return type single lens reflex camera, shutter blades, a single shutter-operating ring for closing and opening the shutter for focusing independently of an exposure operation and for taking of an exposure, driving means for rotating the shutter-operating ring in one direction for closing the shutter blades and reopening the shutter blades for taking an exposure, a signal lever continuously free of said shutter-operating ring rotatable when an exposure is completed, a stop lever pivotally mounted at a fixed point in the vicinity of said shutter-operating ring stopping the rotation of the shutter-operating ring after said shutter-operating ring releases the shutter and opens the shutter blades for taking an exposure, said stop lever being disposed for engaging said signal lever and being locked thereby holding the shutter-operating ring stopped until an exposure is completed, a pin on said shutter-operating ring for engaging said stop lever and camming it in a direction for directly engaging said signal lever and being held thereby for precluding rotation of said shutter-operating ring until release of said stop lever by said signal lever, and when an exposure is completed said signal lever is rotated and releases said stop lever effective to release said pin allowing continued rotation of said shutter-operating ring in said one direction for reopening the shutter blades.