Extensometer

Claim 1

A HIGH SPEED ELECTRONIC EXTENSOMETER FOR DETERMINING THE AMOUNT OF EXTENSION OF A STRIP PASSING THROUGH A ROLLING MILL COMPRISING AN ENTRY ROLL OVER WHICH THE STRIP PASSES BEFORE ENTERING THE MILL, AN EXIT ROLL OVER WHICH THE STRIP PASSES AFTER LEAVING THE MILL, A SEPARATE PLUSE GENERATOR DRIVEN BY SAID ENTRY AND EXIT ROLLS PROVIDING PULSES AT A RATE PROPORTIONAL TO THE SPEEDS OF ROTATION THEREOF, AN ENTRY AND EXIT BINARY CODED DECIMAL ELECTRONIC COUNTER CONNECTED TO AN INDIVIDUAL ONE OF SAID GENERATORS FOR COUNTING THE PULSES THEREFROM, SWITCHING MEANS FOR SELECTING A PEDETERMINED DECIMAL COUNT FOR THE ENTRY COUNTER, MEANS FOR INDICATING COINCIDENCE BETWEEN THE COUNT OF SAID ENTRY COUNTER AND THE SELECTED POSITION OF THE SWITCHING MEANS AND PROVIDING AN OUTPUT INDICATION THEREOF UPON COINDENCE, MONOSTABLE ELECTRONIC SWITCHING CIRCUIT MEANS CONNECTED TO BE RESPONSIVE TO SAID COINCIDENCE OUTPUT INDICATION AND SWITCHABLE IN RESPONSE THERETO FOR PROVIDING AN OUTPUT SIGNAL THEREFROM OF A PRESELECTED TIME DURATION, BINARY CODED DECIMAL ELECTRONIC STORAGE CIRCUIT MEANS CONNECTED TO RECEIVE THE OUTPUT INDICATRIONS FROM SAID EXIT COUNTER AND SWITCHABLE BETWEEN A FOLLOW MODE FOR CONTINUOUSLY RESPONDING TO THE COUNTER INDICATIONS AND A STORAGE MODE FOR RENDERING SAME NON-RESPONSIVE TO THE COUNTER INDICATIONS FOR STORING A PRESELECTED COUNT, BISTABLE ELECTRONIC CIRCUIT MEANS DIRECTLY CONNECTED TO SAID STORAGE MEANS FOR SWITCHING SAME BETWEEN THE FOLLOW AND STORAGE MODES IN ACCORDANCE WITH THE STATE THEREOF AND NORMALLY ARANGED IN A STATE FOR MAINTAINING THE STORAGE MEANS IN THE STORAGE MODE AND CONNECTED TO BE RESPONSIVE TO THE OUTPUT SIGNAL FROM SAID MONOSTABLE