PROBLEM TO BE SOLVED: To provide an automatic water supply stopper which can exert a stable water stopping performance without increasing torque required for stopping water and suppress a cost by achieving the miniaturization of a motor and a solar cell.SOLUTION: The present invention provides an automatic water supply stopper 100 comprising: a water supply tap 102 which has a seal material 112 and a valve body 110 provided in a way capable of pressing from the upstream against the seal material 112 a water supply tap driving mechanism 104 a solar cell 106 and a battery 108, the water supply tap driving mechanism 104 being provided with a prism portion (valve stem) 120 which moves forward and backward toward the direction close to and away from the valve body 110 by rotational drive, the valve body 110 being pressed from the upstream against the seal material 112 by water pressure at the time of stopping water, the valve body 110 being pressured from downstream against the valve body 110 by an upstream tip 118a of a spindle (valve stem) 118 by moving the spindle 118 to the upstream at the time of flowing water, and being separated from the seal material 112.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】自動給水栓において、止水に必要なトルクが増大することなく、安定した止水性能を発現することができ、且つモーター及び太陽電池の小型化を図ることでコストを抑える。【解決手段】シール材112とシール材112に対して上流側から押圧可能に設けられた弁体110とを有する給水栓102と、給水栓駆動機構104と、太陽電池106と、バッテリー108と、を備え、給水栓駆動機構に104は、回転駆動により弁体110に対して近接離間する方向に進退移動する角柱部(弁軸)120が設けられ、止水時には水圧により弁体110がシール材112に上流側から押圧され、通水時にはスピンドル(弁軸)118を上流側へ移動させることによりスピンドル118の上流側先端118aが弁体110に対して下流側から押圧して弁体110がシール材112から離間する自動給水栓100。【選択図】図1
