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:
Apr. 24, 2007
Filed:
Mar. 22, 2006
Yoshiki Hashimoto, Hadano, JP;
Yoshikiyo Tanabe, Fujiyoshida, JP;
Nobuo Chino, Yamanashi, JP;
Fanuc Ltd, Yamanashi, JP;
Abstract
An emergency-stop device provided in a robot system, a machine tool or the like, arranged to promptly detect failure of a circuit through which an emergency stop signal is supplied to an CPU, without stopping the robot system, the machine tool or the like, to improve reliability. When at least one of emergency stop switches is opened, a CPU #or #issues an emergency stop command through one of input circuits, so that a switch SWor SWis opened by an output circuit #or #to emergency-stop the system. Switching means #are opened separately, at appropriate intervals, and change of output of each photo coupler is recognized. In this manner, it is checked that open/closed-state outputs related to contacts Cand CCand Ceach connected to one of the input circuits, indicate an open state. If regarding any of the contacts, change of output of the corresponding photo coupler is not recognized, the system is stopped and an action such as causing a buzzer and displaying of an alarm is taken.