Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Takashi Shirase

Takashi Okamuro

Yasuki Kimura

Hiroo Sakamoto

Tsuneo Hamaguchi

Masamitsu Okamura

Hiroyasu Kawase

Ikio Sugiura

Shinobu Yoshida

Shuichi Maezono

Masaki Iwata

An automatic screw tightening method includes measuring a datum on time-varying screw tightening torque from a motor and a datum on time-varying motor rotational speed between a screw tightening start time point for a male thread with respect to a female threaded hole and a screw tightening completion time point; extracting a plurality of features from measurement-based data on the time-varying screw tightening torque and the time-varying motor rotational speed; and determining, with use of the features, whether a tightened state of the male thread is fit or unfit. In the determination, determining a unified numerical index from the features is included, and the numerical index is compared with a predetermined threshold in the determination of whether the tightened state is fit or unfit. The numerical index is a Taguchi (T) method-based overall evaluation measure from the features.

Automatic screw tightening method and automatic screw tightening apparatus

An electron gun assembling apparatus has a cathode driving mechanism (12,13) for moving a cathode (1), a laser displacement gage (14) to measure a height of a surface of the cathode (1) in a non-contact manner at a cathode surface measuring position outside an electron gun assembly (24), an electric micrometer (11) to measure a height of an upper surface of a first electrode (3) in the electron gun assembly (24), and an electric micrometer (8) to measure a height of a lower surface of a second electrode (4) in the electron gun assembly (24).

Electron gun assembling apparatus and method of assembling electron gun

Growing community of inventors

Tokyo, Japan

Takashi Shirase