| 摘要 |
PROBLEM TO BE SOLVED: To reduce driving force necessary for switching a flowpath mechanize enough and small a driving source, and improve enough reliability thereof. SOLUTION: In a flowpath-switching machine which consists of a casing 1 having connecting flanges 2A, 2B and 2C, a shielding plate type shutter 3 which consists of a flexible film member is used, and a switch of a flowpath shown by arrow A and a flowpath shown by arrow B is obtained by winding up the shutter 3 with a driving mechanism 4, and rewinding the shutter 3 with a return spring 6. Since there is no risk that the shutter for switching a flowpath direction has the large moment, torque of the driving mechanism necessary for switching the flowpath can be reduced. Thereby, the flowpath-switching machine can be mechanized enough and small, and reliability thereof can be improved enough.
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