Unbalance point corrective method and apparatus

An unbalance point correction apparatus comprising:

• an unbalance point measuring apparatus to measure unbalance points by rotating an object to be measured;
• a corrective data operational/computing circuit to operationally output corrective data by preset corrective characteristics based on the measurement result of the unbalance points;
• an unbalance point correction apparatus to correct the unbalance points of said object to be measured based on the corrective data;
• a control circuit to control said unbalance point measuring apparatus to repeat measurement of the unbalance points of said measured object whose unbalance points were already measured and corrected once;
• and
• a correction circuit of corrective characteristics to correct said corrective characteristics based on the measurement result of unbalance points if the result of the repeat measurement is greater than a preset level.

An unbalance point corrective method comprising:

• rotating an object a first time to detect the amount and angle of any unbalance of the object;
• using preset corrective characteristics to correct the object for the unbalance detected during said first rotating time;
• rotating said object a second time to detect the amount and angle of any unbalance remaining in said object after it has been corrected;
• combining the amount and angle of unbalance detected in the corrected object with the amount and angle of unbalance detected during said first rotating time to form a correction quantity;
• using said correction quantity to improve said corrective, characteristics;
• and
• using said improved corrective characteristics to correct the object for unbalance.

An unbalance point correction apparatus which comprises:

• means upon which an object to be rotated is placed,
• means for rotating said object,
• a vibration detection device for detecting any unbalance points of said object,
• an analysis circuit for receiving signals from said vibration detection device for analyzing the signals and for providing an output corresponding to an angular position and amount of any unbalance,
• a memory circuit for receiving signals from said analysis circuit,
• a corrective data output circuit for receiving signals from said analysis circuit,
• an unbalance point correcting device for receiving signals from said corrective data output circuit,
• an operational computer circuit which receives signals from said memory circuit,
• an unbalance correction computer which receives a signal from said operational computer circuit and from said data output circuit,
• an angle correction computer which receives a signal from said unbalance correction computer and which directs a signal to an angular positioning circuit,
• a control circuit for controlling said data output circuit, said unbalance point correcting device, said memory circuit, said angular positioning circuit and a motor drive circuit which positions said object in a position for unbalance correction.