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. 27, 1984
Filed:
Jan. 12, 1982
Akihiko Shimizu, Kawasaki, JP;
Japax Incorporated, Kanagawa, JP;
Abstract
An improved electrode feed system for use in effecting electrical machining between a working electrode and a workpiece electrode across a machining gap has a quick-response electrode retraction and reciprocation capability. The movable electrode is securely supported by an axially movable machining head into which a feed screw extends, the latter being driven by a servo motor responsive via a control circuit to the progress of machining in the gap. In the machining head, the feed screw is in mesh with a feed nut which is restrained from rotation for axially moving the head when the feed screw is rotated by the gap-responsive servo motor, thereby displacing the movable electrode as machining proceeds. The improved system includes a cylinder formed within the machining head and the feed nut is slidably received in the cylinder for axial movement relative thereto, the feed nut being constructed and arranged to define a pair of separate chambers in the cylinder. A plunger-type reciprocation pump is provided outside the machining head to alternately fluid-pressurize the two chambers in the cylinder to axially reciprocate the machining head. The feed nut is spring-biased to a neutral position. In the reciprocation pump, an electric drive motor is rotated alternately in opposite directions to cyclically reciprocate via a feed screw and nut a movable cylinder on a fixed position, whereby to alternately pressurize the respective chambers in the machining head, and thereby axially reciprocate the latter.