Citizen Watch Company, Ltd.

Kohichi Kazahari

Takashi Ihara

Kenji Noguchi

Masahiro Muramatsu

Masayuki Araki

Atsushi Inoue

A machine tool () includes: a front spindle () having a front chuck (); a rear spindle () having a rear chuck (); a controller () configured to cause the rear chuck () to perform a fastening operation for fastening a work (W) fastened to the front chuck () to the rear chuck (); and a detector () configured to detect an abnormality caused by the fastening operation by the rear chuck (), based on measurement data associated with a vibration of at least one of the front chuck () and the rear chuck ().

Machine tool and detection method

A satellite radio-controlled watch, including a receiving unit for receiving a satellite radio wave containing time information and position information; a storage unit for storing intersection point information indicating a position of an intersection point between a reference line along a great circle orthogonal to a specific great circle on the earth or a reference line along the specific great circle on the earth or a circle parallel to the great circle and a time zone boundary, and time difference division information on a wedge-shaped or belt-shaped area that is adjacent to the reference line and to which the intersection point belongs, and a time zone determination unit for determining a time zone, based on the position information, the intersection point information, and the time difference division information.

Growing community of inventors

Higashikurume, Japan

Kohichi Kazahari