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:
Feb. 02, 1993
Filed:
Oct. 08, 1991
Applicant:
Inventors:
Takuji Magara, Aichi, JP;
Masahiro Yamamoto, Aichi, JP;
Assignee:
Mitsubishi Denki K.K., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23H / ; B23H / ;
U.S. Cl.
CPC ...
219 6912 ; 269-8 ;
Abstract
A wire-type electric discharge machining apparatus capable of attracting material from a workpiece to an integral electromagnet. An aperture is located proximate the electromagnet. When material is attracted by the electromagnet, the aperture will be obstructed. Attraction is confirmed by measuring the pressure in a chamber in communication with the aperture, such that a low pressure indicates obstruction, and thus attraction of the material to the electromagnet. If based on this measurement it appears that the material has not been attracted to the electromagnet, a further attempt is made at a different location of attraction.