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:
May. 05, 2009
Filed:
Jul. 24, 2006
Koji Yoneda, San Jose, CA (US);
Tatsuo Toyonaga, San Jose, CA (US);
Koji Yoneda, San Jose, CA (US);
Tatsuo Toyonaga, San Jose, CA (US);
Sodick Co., Ltd., Yokohama, Kanagawa, JP;
Sodick America Corporation, San Jose, CA (US);
Abstract
An electric discharge machining apparatus comprises a power supply () for applying a voltage to a work gap formed between a tool electrode (E) and the workpiece (W) and a motor () that moves the tool electrode relative to the workpiece. An electric discharges counter () counts a number of electric discharge occurrences within a specified period (Td) and generating a first count. A gap controller () multiplies the first count by a gain to generate position command or speed command for motor drive. An inversion counter () counts a number of inversions of the gap voltage upwards or downwards within a second specified period (Td) and generating a second count. An electric discharge discriminator () discriminates the occurrence of electric discharge when the second count reaches a set value.