| 摘要 |
PROBLEM TO BE SOLVED: To solve shocking movement, by setting the opening angle of each communicating groove corresponding to opening angles of an air introducing opening and an air lead-through opening. SOLUTION: When a rotary disc 2 is rotated by an opening angle (a) between an air introducing opening 11 and a lead-through opening 12 after the base end of a communicating groove 20a is matched to the position of the air introducing opening 11, air introduced from the air introducing opening 11 is supplied to the first air chamber A of an air mat through a communicating hole 11a, the communicating groove 20a and the intake passage of a communicating hole 12a, and air supplying action is maintained while the rotary disc 2 is rotated by an angle (θA-a). After that, air supplying action is stopped while the rotary disc 2 is rotated by an angle (θA+a), and further, exhaust action is executed while the rotary disc 2 is rotated by an angle θ. The opening angle of each communicating groove is thus set corresponding to the opening angle (a) between the air introducing opening 11 and the lead-through opening 12, therefore shocking movement can be dissolved. |
