Toyoda Koki Kabushiki Kaisha

Mineo Ishikawa

Tamaki Tomita

Hayashi Kodama

Kazuo Moriya

A grinding machine provided with an apparatus for changing a feed rate of a grinding wheel relative to a workpiece just before the grinding wheel comes into contact with the workpiece. An electrode device is mounted adjacent to the grinding wheel and connected to an electric power source for applying a potential to the surface of the grinding wheel. A detecting device detects a difference of potential between the grinding wheel and the workpiece to generate an output voltage. A memory device memorizes the output voltage detected when the grinding wheel is distant from the workpiece. A setting device reduces the memorized output voltage at a predetermined rate to provide a reference voltage corresponding to a predetermined gap between the grinding wheel and the workpiece. A comparator circuit compares the output voltage with the reference voltage to generate a feed rate changing signal when the output voltage attains the reference voltage. A control device controls a feed device so as to change the feed rate of a wheel slide in accordance with the feed rate changing signal.

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Kariya, Japan

Mineo Ishikawa