Fail safe power feed system
First Claim
1. IN COMBINATION WITH ELECTRICAL MACHINING EQUIPMENT HAVING MEANS FOR PASSING ELECTRICAL DISCHARGE ACROSS A GAP BETWEEN AN ELECTRODE AND A CONDUCTIVE WORKPIECE FOR ERODING SAID WORKPIECE, SERVO MEANS FOR CONTROLLING THE GAP SPACING BETWEEN SAID ELECTRODE AND SAID WORKPIECE AND FOR MAINTAINING SAID SPACING SUBSTANTIALLY CONSTANT AS MATERIAL IS ERODED FROM THE WORKPIECE BY CAUSING RELATIVE ADVANCE OF THE ELECTRODE AND WORKPIECE, MEANS FOR CONTROLLING OPERATION OF SAID SERVO MEANS INCLUDING A MOTIVE MEANS AND A SENSING CIRCUIT OPERABLY RESPONSIVE TO CHANGE A SINGLE PARAMETER OF THE DISCHARGE CIRCUIT OF SAID EQUIPMENT, A TRANSISTOR CONNECTED BETWEEN SAID SENSING CIRCUIT AND SAID MOTIVE MEANS AND OPERABLE BETWEEN CONDUCTIVE AND NONCONDUCTIVE STATES RESPONSIVE TO THE OUTPUT OF SAID SENSING CIRCUIT, A REFERENCE VOLTAGE CONNECTED IN THE BASE-EMITTER LEAD OF SAID TRANSISTOR FOR MAINTAINING SAID TRANSISTOR IN A NORMALLY NONCONDUCTIVE STATE, SAID TRANSISTOR OPERABLE IN ITS CONDUCTIVE STATE TO CONTROL THE OPERATION OF SAID MOTIVE MEANS TO INCREASE GAP SPACING AND OPERABLE IN ITS NONCONDUCTIVE STATE TO CONTROL THE OPERATION OF SAID MOTIVE MEANS TO DECREASE GAP SPACING, AND AT LEAST ONE DIODE OF RELATIVELY HIGHER CURRENT RATING AND HIGHER TOTAL CONDUCTION VOLTAGE IS CONNECTED ACROSS THE BASE AND EMITTER JUNCTION OF SAID TRANSISTOR IN LIKE POLARITY WITH SAID BASE-EMITTER JUNCTION.
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1 Claim
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1. IN COMBINATION WITH ELECTRICAL MACHINING EQUIPMENT HAVING MEANS FOR PASSING ELECTRICAL DISCHARGE ACROSS A GAP BETWEEN AN ELECTRODE AND A CONDUCTIVE WORKPIECE FOR ERODING SAID WORKPIECE, SERVO MEANS FOR CONTROLLING THE GAP SPACING BETWEEN SAID ELECTRODE AND SAID WORKPIECE AND FOR MAINTAINING SAID SPACING SUBSTANTIALLY CONSTANT AS MATERIAL IS ERODED FROM THE WORKPIECE BY CAUSING RELATIVE ADVANCE OF THE ELECTRODE AND WORKPIECE, MEANS FOR CONTROLLING OPERATION OF SAID SERVO MEANS INCLUDING A MOTIVE MEANS AND A SENSING CIRCUIT OPERABLY RESPONSIVE TO CHANGE A SINGLE PARAMETER OF THE DISCHARGE CIRCUIT OF SAID EQUIPMENT, A TRANSISTOR CONNECTED BETWEEN SAID SENSING CIRCUIT AND SAID MOTIVE MEANS AND OPERABLE BETWEEN CONDUCTIVE AND NONCONDUCTIVE STATES RESPONSIVE TO THE OUTPUT OF SAID SENSING CIRCUIT, A REFERENCE VOLTAGE CONNECTED IN THE BASE-EMITTER LEAD OF SAID TRANSISTOR FOR MAINTAINING SAID TRANSISTOR IN A NORMALLY NONCONDUCTIVE STATE, SAID TRANSISTOR OPERABLE IN ITS CONDUCTIVE STATE TO CONTROL THE OPERATION OF SAID MOTIVE MEANS TO INCREASE GAP SPACING AND OPERABLE IN ITS NONCONDUCTIVE STATE TO CONTROL THE OPERATION OF SAID MOTIVE MEANS TO DECREASE GAP SPACING, AND AT LEAST ONE DIODE OF RELATIVELY HIGHER CURRENT RATING AND HIGHER TOTAL CONDUCTION VOLTAGE IS CONNECTED ACROSS THE BASE AND EMITTER JUNCTION OF SAID TRANSISTOR IN LIKE POLARITY WITH SAID BASE-EMITTER JUNCTION.
Specification
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Current AssigneeRobert S. Webb
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Original AssigneeRobert S. Webb
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InventorsWebb, Robert S.
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Application NumberUS04/102,679Time in Patent Office1,167 DaysField of SearchUS Class Current219/69.19CPC Class CodesB23H 1/026 Power supply protection, e....
