Stevens, Davis, Miller & Mosher
Tool monitoring system
 A tool monitoring system for detecting a tool failure of a tool employed in a tool machine, comprising artificial signal generating unit for generating a predetermined artificial tool failure signal simulating the acoustic emission signal obtained in an actual failure of the tool, acoustic emission transducing unit adapted to be mounted on the tool machine near the tool and driven by the artificial signal generating unit for applying the artificial tool failure signal to the tool machine, acoustic emission sensing unit mounted on the tool machine near the tool so as to receive, in a setting mode of the system where the transducing unit is mounted on the machine, the applied artificial tool failure signal from the acoustic emission transducing unit through the tool machine and, in a monitoring mode of the system where the tool is operated, an acoustic emission from the tool, and signal processing unit for analyzing an output signal generated from the acoustic emission sensing unit to detect the tool failure of the tool. 
Omron Tateisi Electronics Co.
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Norio Koichi Kiyokazu Takaharu Tatemitsu Tatsuhiko Ryoichi Tetsuro Takeshi Kazuaki Hideaki Hiroyuki
Miyawaki Tshujino Yoshimura Takinami Hirayama Naito Miyake Iwakiri Yamada Otsuka Nakamura Yamada