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:
Oct. 23, 1990
Filed:
Oct. 06, 1989
Miyuki Gotou, Aichi, JP;
Hiroshi Takeuchi, Aichi, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A mechanism for preventing the loosening of a wire electrode of an EDM apparatus which is wound around a bobbin. The mechanism is provided with a loosening preventive device 5 including a presser plate 8 for pressing the outer periphery of the wire electrode against the bobbin by a spring pressure. The loosening preventive device presses the wire before electrical discharge and is separated from the bobbin when the electrical discharge is started. When the wire is broken or the wire feeding is stopped, the wire breaking or the feeding stop is detected and the presser plate is immediately pressed against the outer periphery of the wire so as to prevent the returning wire from bulging or backlashing out of the bobbin.