Omron Tateisi Electronics Co.

Hideaki Nakamura

Tamotsu Shimamori

Shinichi Murashige

Hiroyuki Yamada

Takeshi Yamada

Ryoichi Miyake

Tatsuhiko Naito

Takaharu Takinami

Kiyokazu Yoshimura

Kazuaki Otsuka

Koichi Tshujino

Tetsuro Iwakiri

Norio Miyawaki

Tatemitsu Hirayama

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.

Tool monitoring system

In this transducer, for converting an analog input signal into an analog output signal whose level corresponds to the level of the analog input signal, there are included: an A/D converter for converting the analog input signal into a digital signal; an input device comprising a plurality of switches; an upper limit setting means for setting an upper limit value for the analog input signal, according to operation of the switches; a lower limit setting means for setting a lower limit value for the analog input signal, according to operation of the switches; a storage device, for storing a current value of the digital signal output by the A/D converter; a comparison means for comparing the current value of the digital signal output by the A/D converter as converted from the analog input signal, and the upper limit value and the lower limit value, all of which are stored in the storage device; an output means for producing an output when the comparison executed by the comparison means indicates that the current value of the digital signal output by the A/D converter as converted from the analog input signal has exceeded the upper limit value, or has dropped below the lower limit value; and a D/A converter for converting the digital signal output by the A/D converter as converted from the analog input signal into an analog output signal whose level corresponds to the level of the analog input signal. Variations on this theme are also disclosed.

Transducer for process control

Transducer and related circuitry

A transducer which converts an analog input signal into an analog output signal whose level corresponds to the level of the analog input contains an A/D converter and comparison means for indicating when the value of digital A/D output exceeds or falls below certain limits and includes an AC effective value-DC conversion circuit which avoids expensive square root circuitry while providing accurate conversion. A rectified voltage and a feedback voltage are applied to a current squaring circuit whose output is applied to an averaging circuit. The squaring circuit has a first conversion means for generating a current proportional to the rectified input and a second conversion means for dividing the sum of the rectified and feedback voltages, and converting the result to a rectified current. The currents are then summed and supplied to the averaging means.

Growing community of inventors

Joyo, Japan

Hideaki Nakamura