PROBLEM TO BE SOLVED: To increase pressure in a massage bag in a short period of time without increasing a fluid amount which can be supplied per unit time.SOLUTION: Pressure in an air cell reaches target pressure in a short period of time by starting expansion from a state in which the pressure remains in the air cell. Concretely, when a prescribed time t3 elapses after the start of contraction motion, an exhaust port of a solenoid valve is closed in a state in which the pressure remains in the air cell (Refer to (3)). That is, both an air intake port and the exhaust port are closed, and the air cell goes into a pressure-remaining state in which the pressure remains in the air cell, and the pressure-remaining state is maintained (Refer to (4)). Then, when a prescribed time t4 elapses in the pressure-remaining state, the air intake port is opened, and expansion motion for supplying air to the air cell is started (Refer to (5)).COPYRIGHT: (C)2014,JPO&INPIT【課題】単位時間当たりの供給可能な流体量を多くすることなく、マッサージ用袋体内の圧力を短時間で高くする。【解決手段】エアセルに圧力が残った状態から膨張を開始することで、エアセル内の圧力は目標の目標圧力に短時間で到達する。具体的には、収縮動作を開始して所定の時間t3が経過すると、エアセルに圧力が残った状態で、電磁弁の排気ポートが閉じられる((3)を参照)。つまり、吸気ポートと排気ポートの両方が閉じられエアセルに圧力が残った残圧状態となり、この残圧状態が維持される((4)を参照)。そして、この残圧状態で所定の時間t4が経過すると、吸気ポートが開きエアセルに空気を供給する膨張動作が開始される((5)を参照)。【選択図】図5
