Nissei Plastic Industrial Co., Ltd.

Seiichi Sakurada

Takashi Hakoda

Fumio Shiozawa

Kazuki Miyairi

Tetsuo Ikeda

An ending target position Xes corresponding to the measurement ending position Xe, a rotation rate pattern Ar to rotate a screw, and a hypothetical retraction rate pattern Ab for the screwto retract are set in advance, the remaining rotation rate pattern Ar to stop the screwrotation at the ending target position Xes is predicated by calculation based on the screw position X detected at every specified time interval Ts at the time of measurement, based on which the screwis controlled to rotate to the measurement ending position Xe, the remaining retraction rate pattern Ab to stop the screwretraction at the ending target position Xe based on the screwretraction rate Vd detected at every specified time interval Ts, based on which the screwis controlled to retract to the measurement ending position Xe, the rotation and retraction of the screware stopped, and subsequently the screwis controlled to reverse rotate by a pre-set constant amount of rotation Rc while position controlling its position to the measurement ending position Xe.

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Nagano-ken, Japan

Seiichi Sakurada