The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1988
Filed:
Jan. 31, 1985
Katsuhiro Matsumoto, Tokyo, JP;
Akira Fujii, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A discharge gap measuring circuit measures the gap between a machining electrode and a workpiece in an electric discharge machining apparatus which uses a pulsed voltage as input. The circuit includes peak detecting means to measure the peak value of the voltage that develops between the machining electrode and the workpiece. Further, waiting time detecting means measure the time from the beginning of the input electrical pulse to the actual start of the discharge. An adder circuit combines the outputs of the two detecting circuits to produce a voltage representative of the actual gap. The output is used for controlling the position of the workpiece or the electrode to maintain the gap at a constant level so that a uniform workpiece finish and accelerated operation is obtained.