Electromechanical trigger for encoder application for non-ambiguity readout

Claim 1

AN ELECTROMECHANICAL TRIGGER COMPRISING: A PAIR OF ROTATABLE MEMBERS COUPLED FOR CONJOINT ROTATION, ONE AT A HIGHER SPEED THAN THE OTHER; A CIRCULAR CODE TRACK ON EACH OF SAID MEMBERS CONCENTRIC TO THE MEMBER''S AXIS OF ROTATION, EACH SAID CODE TRACK BEING DIVIDED LENGTHWISE INTO A FIRST PORTION, ELECTRICALLY CONDUCTIVE ABOUT THE ENTIRE 360* OF ITS CIRCUMFERENTIAL EXTENT, AND A SECOND PORTION CONSISTING OF RESPECTIVE, ELECTRICALLY CONDUCTIVE AND NONCONDUCTIVE SEGMENTS OF 180*; INPUT MEANS ELECTRICALLY COUPLED TO THE FIRST TRACK PORTION OF EACH OF SAID TRACKS; A SINGLE, SIGNAL-PICKOFF MEANS ELECTRICALLY COUPLED TO THE SECOND TRACK PORTION OF THE TRACK OF THE HIGHER SPEED ROTATABLE MEMBER; A PAIR OF SIGNAL-PICKOFF MEANS ELECTRICALLY COUPLED TO THE SECOND TRACK PORTION OF THE TRACK OF THE LOWER SPEED ROTATABLE MEMBER, SAID SINGLE AND PAIR OF PICKOFF MEANS BEING FIXEDLY MOUNTED WITH RESPECT TO EACH OTHER AND RELATIVE TO SAID ROTATABLE MEMBERS, THE INDIVIDUAL PICKOFF MEANS OF THE PAIR OF PICKOFF MEANS BEING DISPOSED RESPECTIVELY TO LEAD AND TRAIL THE SINGLE PICKOFF MEANS, WITH REFERENCE TO DIRECTION OF ROTATION OF SAID ROTATABLE MEMBERS, BY SUBSTANTIALLY EQUAL CIRCUMFERENTIAL DISTANCES; AND LOGIC CIRCUIT MEANS FOR DERIVING AN OUTPUT SIGNAL FROM THE LEADING PICKOFF MEANS WHEN THE SINGLE PICKOFF MEANS IS ON ONE OF SAID 180* SEGMENTS AND FROM THE TRAILING PICKOFF MEANS WHEN THE SINGLE PICKOFF MEANS IS ON THE OTHER OF SAID 180* SEGMENTS AND FROM THE CUIT MEANS INCLUDING AN OR GATE; A PAIR OF AND GATES, EACH HAVING A PAIR OF INPUTS AND AN OUTPUT, THE OUTPUT OF EACH AND GATE FEEDING SAID OR GATE, ONE OF SAID AND GATES HAVING ONE INPUT CONNECTED TO SAID SINGLE PICKOFF MEANS ITS OTHER INPUT CONNECTED TO A TRAILING PICKOFF MEANS, THE OTHER AND GATE HAVING ONE INPUT CONNECTED TO THE LEADING PICKOFF MEANS; AND AN INVERTER CONNECTING SAID SINGLE PICKOFF MEANS TO THE OTHER INPUT OF SAID OTHER AND GATE.