| 摘要 |
A liquid supply system including a main tank, a feed pump, a subtank, a negative pressure maintenance mechanism, and a directional control valve. The main tank stores liquid. The feed pump sucks the liquid held in the main tank through a pump suction opening and discharges the liquid through a pump discharge opening. The subtank holds the liquid discharged from the pump discharge opening and supplies the liquid to the liquid ejecting head. The negative pressure maintenance mechanism monitors a supply channel from the subtank to the liquid ejecting head so that the supply channel is opened only when the pressure of a channel to the liquid ejecting head is lower than a predetermined pressure. The directional control valve restrains liquid from flowing from the pump discharge opening to the pump suction opening when the pressure of the pump discharge opening is less than a predetermined pressure.
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