The liquid supply apparatus of the present invention, a storage tank for storing the liquid, a first end connected to the storage tank extending from the reservoir tank, the liquid remaining therein over time a predetermined amount, the supply line to flow back into the storage tank, the storage tank or the arranged supply line, liquid feed unit for feeding the liquid to the second end of the supply conduit from the reservoir tank, the liquid feed, time measuring unit, and which is connected to the timer unit and the liquid feed unit, a control unit for the liquid supply unit based on the passed time is driven for a predetermined time period for measuring an elapsed time from the stop of the liquid feed by parts, including.本発明の液体供給装置は、液体を貯留する貯留タンク、第1の端部が前記貯留タンクに接続され前記貯留タンクから延出し、内部に残留している前記液体が経時的に所定量、前記貯留タンクに逆流する供給管路、前記貯留タンク、または前記供給管路に配置され、前記貯留タンクから前記供給管路の第2の端部に前記液体を送液する送液部、前記送液部による前記送液の停止からの経過時間を計測する計時部、及び前記送液部と前記計時部に接続され、前記経過時間の長さに基づき前記送液部を所定時間駆動させる制御部、を含む。
