The Nippon Signal Co., Ltd.

Masao Mukaidono

Koichi Futsuhara

Noboru Sugimoto

Masayoshi Sakai

Souichi Kumekawa

A method for assuring a safe work space operates so that a work enable signal is generated only when absence of workers from the work space where the workers work in cooperation with a machine is detected. The work enable signal has a logical value of 1 corresponding to a high energy state and only this signal can initiate activation of the machine sharing the subject work space thereby assuring safe environments for workers.

Method and apparatus for assuring safe work

The present invention is to provide a fail-safe slide operation control device for a press of simple structure when the electronic circuit by fail-safe signal processing as a circuit for monitoring overrun and confirming the OFF condition of an operation button, which is important function to control the slide, is used instead of a contact circuit composed of relays.

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Tokyo, Japan

Masao Mukaidono