| 摘要 |
PURPOSE:To control the flow of air in an agricultural house and ideally perform the control of temperature in the house by attaching a string to a fixed rotational shaft and a transfer rotational shaft in a tangential type and further fixing one end of a soft thin filmy on the transfer rotation shaft. CONSTITUTION:The left half of a house is covered with a sheet 8 and the right half is covered with a sheet 10. At the position of a shaft Y the left end U of the sheet 10 is placed the sheet 8 to close the ridge of the house with the sheets 8 and 10. When the shaft Y is rotated counter clock wise toward the arrow, the shaft Y is left transferred and the sheet 8 and the string 4 and wound up and the string 4 is simultaneously unwound from the shaft X. The sheet on the ridge is opened only a distance of the counter clock wise rotation of the shaft Y, and when the shaft Y is transferred to a position of Z, the sheet of the ridge is opened for only a distance of U-V. In order to close the sheets of the ridge the shaft X is rotated clock wise when the string is an outer tangential type or the shaft X is rotated counter clock wise when the shaft X is an inner tangential type, thereby pulling the string of the shaft Z to rotate clock wise and pull the shaft Z in the direction. At the position of the shaft Y the sheet of the ridge is perfectly closed. The degree of closing or opening of the sheet can be controlled by suitably selecting the position of the shaft Z. |
