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:
Sep. 21, 1982
Filed:
Jun. 12, 1980
Johann Janicke, La Chapelle Rambaud, FR;
Roger Girardin, Vernier, CH;
Ateliers des Charmilles, S.A., Geneva, CH;
Abstract
An automatic wire rethreading mechanism for traveling wire EDM apparatus wherein the workpiece is cut by electrical discharges by an electrode in the form of a wire, comprising a mechanism for automatically threading the electrode wire through a pre-drilled hole in the workpiece, the automatic wire threading mechanism being adapted to thread the wire at the beginning of a cutting operation and any time the electrode wire is ruptured in the course of a cutting operation. The position of the pre-drilled hole is memorized, as well as the relative position of the wire and workpiece at the instant of wire rupture. The workpiece and the electrode wire holders are returned to their start position along a predetermined path and, after threading the wire again through the pre-drilled hole, the electrode wire and the workpiece are displaced relative to each other, without applying electrical discharges between the electrodes, along the already cut path until the wire electrode and the workpiece are positioned relative to each other in the same position as occupied when the electrode wire ruptured.