PURPOSE: To improve weighing precision by switching a weighing mode from a complete discharge control mode to a discharge control mode automatically when a weighing error exceeds a permissible error, and weighing an overweighed raw material.
CONSTITUTION: A CPU12 supplies a discharge command to a comparison control circuit 5. A weight detecting circuit 10 supplies a discharge to the comparison control circuit 5. The comparison control circuit 5 drives an electromagnetic feeder 9 when discharging operation starts, performing the discharging operation at a high speed. When the discharge attains to the command, the comparison control circuit 5 stops the electromagnetic feeder 9. The CPU12 subtracts the remaining amount in a hopper 6 from a charge command and supplies the result to the comparison control circuit 5 as the 2nd charge command. Then, the weighing mode is changed from the discharge control mode to the complete discharge control mode and the 2nd weighing is started.
TAKANO TOSHIJI
FUJIMOTO TSUNEZOU
