Variable shutter mechanism

Claim 1

A MECHANISM HAVING LOW INERTIA AT HIGH SPEEDS FOR VARYING THE ANGULAR RELATIONSHIP BETWEEN TWO COAXIAL ROTARY MEMBERS WHILE ROTATING AT HIGH SPEEDS, COMPRISING: FIRST AND SECOND COAXIAL ROTARY MEMBERS MOUNTED FOR ROTATION ABOUT THEIR COMMON AXIS; A THIRD ROTARY MEMBER MOUNTED FOR ROTATION ABOUT AN AXIS SPACED FROM THE AXIS OF SAID FIRST AND SECOND ROTARY MEMBERS; FIRST AND SECOND ENDLESS FLEXIBLE LOOPS, SAID FIRST LOOP PASSING AROUND SAID FIRST AND THIRD ROTARY MEMBERS AND CONNECTING SAID FIRST AND THIRD ROTARY MEMBERS IN A NON-SLIP, DRIVING MANNER, SAID SECOND LOOP PASSING AROUND SAID SECOND AND THIRD ROTARY MEMBERS AND CONNECTING SAID SECOND AND THIRD ROTARY MEMBERS IN A NON-SLIP, DRIVING MANNER; MEANS TO DRIVE THE COMBINATION OF SAID THREE ROTARY MEMBERS AND SAID LOOPS, WHEREBY ALL OF SAID THREE ROTARY MEMBERS ARE CAUSED TO ROTATE; EACH OF SAID LOOPS HAVING TWO GENERALLY OPPOSED RUNS EXTENDING BETWEEN THE TWO ROTARY MEMBERS WHICH IT CONNECTS; AT LEAST ONE OF SAID LOOPS BEING LONGER THAN WOULD BE REQUIRED MERELY TO CONNECT THE TWO ROTARY MEMBERS AROUND WHICH IT PASSES; LOOP SHIFTING MEANS ENGAGING BOTH RUNS OF SAID LONGER LOOP SO AS TO TAKE UP TH SLACK WHICH WOULD OTHERWISE EXIST IN SAID LONGER LOOP; MEANS TO IMPART TO SAID LOOP SHIFTING MEANS A MOTION HAVING A COMPONENT IN A DIRECTION PERPENDICULAR TO A LINE CONNECTING THE AXIS OF SAID FIRST AND SECOND COAXIAL ROTARY MEMBERS AND THE AXIS OF SAID THIRD ROTARY MEMBER, WHEREBY THE POSITION OF SAID LONGER LOOP ENGAGED BY SAID LOOP SHIFTING MEANS IS SHIFTED SO THAT THE RELATIVE LENGTHS OF ITS TWO RUNS ARE ALTERED THE RELATIVE ANGULAR POSITIONS OF THE TWO ROTARY MEMBERS WHICH SAID LONGER LOOP CONNECTS ARE ALTERED, AND CONSEQUENTLY THE RELATIVE ANGULAR POSITIONS OF SAID FIRST AND SECOND COAXIAL ROTARY MEMBERS ARE ALTERED.