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:
Mar. 25, 2003
Filed:
Oct. 24, 2001
Sadao Sano, Kanagawa, JP;
Akio Hosaka, Fukui, JP;
Other;
Abstract
An electric discharge machine having an electrode mounting device ( ) for mounting a tool electrode, a quill ( ) movable in the vertical direction and having the tool mounting device attached to a lower end, at least two linear motor movers ( ) attached to the quill and disposed symmetrically about the central axis of the quill, at least two linear motor stators ( ), each disposed opposite one of the at least two movers, and a balance device ( ) for balancing a gravitational force acting on the quill. The balance device has an air cylinder ( ) arranged coaxially with the quill so that a balance force having a force vector aligned with the central axis of the quill is generated. The air cylinder is preferably mounted in a hole formed in the center of the quill and extends in a vertical direction.