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. 29, 1998
Filed:
Jul. 22, 1997
Shinichi Kono, Yamanashi, JP;
Junichi Tezuka, Yamanashi, JP;
Fanuc Ltd., Yamanashi, JP;
Abstract
A method and apparatus for controlling a machine in a power failure. The present invention is applicable to such machines that a tool and a workpiece must always be controlled in synchronization with each other, and allows the tool and workpiece to stop without any damage in the power failure situation. If a power failure occurs during a synchronous cutting operation, the present invention disables a power regeneration function, connects a discharge resistor unit to a DC link of a power regeneration circuit, decelerates motors for tool drive and workpiece drive in synchronization with each other, and retracts the tool back to a safe area by driving a motor for tool feed with the power regenerated from the other two motors.