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:
Jan. 26, 1999
Filed:
Oct. 31, 1997
Yoshihide Kinbara, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An electric discharge machine is equipped with a current detector 410 for causing an auxiliary discharge circuit 200 to be operated and for detecting that a value of an auxiliary current exceeds a predetermined value; a timer 401 having first setting time longer than time defined until flowing of charge current into the auxiliary current is ended; a timer 403 having second setting time defined after a detection is made that the value of the auxiliary current exceeds the predetermined value until the discharge operation is brought into a stable condition after the first setting time; an operation means 470 for stopping the auxiliary discharge circuit 200 after the second setting time has passed, and for causing the main discharge circuit 300 to be operated during preselected time; and a timer 440 having a setting time longer than such time that after the operation means causes the main discharge circuit to be operated during the preselected time, the current value of the main discharge circuit 300 becomes lower than, or equal to a predetermined value; and for producing an end signal after this setting time has passed.