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:
Dec. 04, 2001
Filed:
Nov. 04, 1999
Tatsuo Toyonaga, Yokohama, JP;
Masateru Minamikawa, Yokohama, JP;
Sodick Co., Ltd., Yokohama, JP;
Abstract
A wire cut electrical discharge processing device comprising a device (,) which takes up a wire electrode, the wire electrode (,) traveling along a wire conveying path; a servo motor (,B) which applies tension to the traveling wire electrode; a NC device which generates signals which indicate a set value for the tension; a force detector (,) which detects the tension applied to the wire electrode and generates signals which indicate the detected value; and a tension control device (,) which processes signals which indicate the set value of the tension and the signals which indicate the detected value of the tension and which supplies speed command signals which direct the speed of rotation of the servo motor. The tension control device comprises two continuously connected notch filters (,and,) which check different frequencies. The unnecessary frequency setting device (,) sets the minimum value of the unnecessary frequency for one of the notch filters and sets the maximum of the unnecessary frequency for the other notch filter.