| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an automatic watering device having a structure which surely prevents water leak when stopping water by water supply from an agricultural waterway to a rice field, and enabling unmanned draining and stopping water. Ž<P>SOLUTION: The automatic watering device enables unmanned draining and stopping water to perform an operation of draining water in the evening and stopping water in the early morning, by attaching a light sensor to the device, and vertically moving a valve of a passage to drain and stop water when an illumination in the sky becomes out of a previously fixed illumination range. The device is so formed that in a mechanism in which a male screw is processed in a part of about one-third in the middle of a main axis on a perpendicular line of a motor axis and a corresponding female screw part moves only in a range of the male screw so as to prevent water leak, it is possible to drain and stop water by attaching a valve to the female screw part, and to ensure water leak prevention, an elastic body is put between the female screw part and the valve. As a result of this, the valve is always continuously pushed downward using repulsion of the elastic body when stopping water, so water leak hardly occurs. Furthermore, the female screw is useful for overload prevention of a motor because of coming off from a screw thread when passing the one-third part. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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