M. Sakai et al., LOGIC AND METHOD OF SAFETY IN CONTROLLING A POWER PRESS, JSME international journal. Series C, dynamics, control, robotics, design and manufacturing, 36(4), 1993, pp. 470-477
The Ministry of Labor in Japan has established a standard for the mech
anical structure of power presses. The standard stipulates that the po
wer press be equipped with an overrun monitor function that enables th
e slide to be forcibly stopped when the slide fails to stop within a s
pecified allowable range around the top dead center. The operation of
the power press is considered to be a man-machine system in which both
the operator and the machine may make errors. The overrun monitor fun
ction is defined as a requirement for safe operation of the system. A
signal processing method is established for fail-safe operation of the
overrun monitor function. A fail-safe overrun monitor system based on
the signal processing method is presented.