Emergency-stop device

Details Emergency-stop device Emergency-stop device

2007-04-24

2007-04-24

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

C307S115000, C361S115000

Reexamination Certificate

active

11385998

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 #1or #2issues an emergency stop command through one of input circuits, so that a switch SW10or SW20is opened by an output circuit #1or #2to emergency-stop the system. Switching means #1, #2are 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 C11and C21/C12and C22,each 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.

REFERENCES:
patent: 4653003 (1987-03-01), Kirstein
patent: 6051894 (2000-04-01), Shimogama
patent: 6570355 (2003-05-01), Morita et al.
patent: 6711713 (2004-03-01), Rumpler et al.
patent: 6734581 (2004-05-01), Griffis
patent: 6882155 (2005-04-01), Lazzaro
patent: 7133747 (2006-11-01), Hashimoto et al.
patent: 0336973 (1989-10-01), None
patent: 1099519 (2001-05-01), None

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