PURPOSE: To reduce the washing load.
CONSTITUTION: A valve 108 for discharging water is opened by a controller 100 when an automatic water discharge switch 112 is turned on, and washing water in a washing tank 28 is discharged into a waste liq. tank 106. The valve 108 is then closed and a water supply valve 102 is opened, and the washing replenishing tank 96 is supplied into the washing tank 28 to a reference level. A motor 88 is then driven to rotate each pair of rollers of a conveyor rack 42. A cycle consisting of the discharge of washing water, water supply to the washing tank 28 and rotation of the pair of rollers is conducted twice, and the precipitate, deposit, etc., in the washing tank 28 are removed. Finally, the valve 108 is opened to discharge the washing water from the tank 28, and washing is finished.
ICHIKAWA KAZUHARU
TAKIGAMI TOMOYUKI
