A Construction Method of Safety Work System Based on Confirming Rotation Stop

• Published in: Nihon Kikai Gakkai ronbunshū. C Vol. 60; no. 576; pp. 2730 - 2737
• Main Authors: Sakai, Masayoshi, Futsuhara, Koichi, Suzuki, Masatoshi, Sugimoto, Noboru
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 1994
• Subjects: Door Switch; Fail-Safe; Industrial Machine; Interlock; Motion Monitor; Safety Control; Safety Engineering; Stop Confirmation
• DOI: 10.1299/kikaic.60.2730
• ISSN: 0387-5024

A man-machine work system such as press working is constructed so that the worker is permitted to enter the work space freely, and safety is assured only on the movable machine-side. This paper describes interlocking systems which guard the worker automatically. In this paper, a safety system based on confirming the rotation-stop state of a motor is proposed and the method for constructing fail-safe rotation-stop sensors is presented. In the interlocking system shown here, work-start permission to the man-side is provided as a mechanical output from the machine-side. The rotation-stop-state confirmation signal is produced as a logical product of the confirmation signal indicating that the sensor monitoring rotation of the motor is normal and the output of NOT operation which does not erroneously report rotation-stop-state. The safety system presented in this paper meets the requirement of Section 9.7 of British Standard Code of practicefor safety of machinery.