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:
Jul. 23, 2002
Filed:
Feb. 01, 2001
Sodick Co., Ltd., Kanagawa, JP;
Abstract
A power supply ( ) and a method for electric discharge machining by repeatedly providing a current pulse to a working gap ( ) formed between a tool electrode ( ) and a workpiece ( ) includes a d.c. power source (E), first switching elements (Tr -Trn) connected between the d.c. power source and the working gap, capacitors (C -C ) connected in parallel with the working gap, second switching elements ( ) for controlling current flow from the capacitor to the working gap, a detector ( ) for detecting start of an electric discharge, and a controller ( ) for controlling the first switching elements and the second switching elements in response to the detector. Current is supplied from the d.c. power source through the first switching elements to the working gap only for a first time interval (&tgr; ON) starting from the commencement of electric discharge, and a current is supplied from the capacitor through the second switching elements to the working gap for only a second time interval (T) is shorter than the first time interval, starting from the commencement of an electric discharge.