| 摘要 |
PURPOSE:To facilitate multistage position control for an output shaft of a negative pressure cylinder by controlling electricity supplied to a pair of electromagnetic valves to control two negative pressure in-and-out valves in a multistage control device suitable to an air blow-off opening switching device in an air conditioner for cars. CONSTITUTION:A double-acting negative pressure cylinder 1 is adapted to introduce negative pressure from a negative pressure source 9 through a three-way electromagnetic valve 70 and two negative pressure in-and-out valves 10a, 10b and is controlled at multistage position. In this case, a plurality of sliders 41a- 41d of a position control switch 40 are coupled to an output shaft 6 of the cylinder 1 through a sliding shaft 42 and a coupling band 43. A plurality of stators 44a-47a of the position control switch 40 are connected to a coil of one electromagnetic valve 70a of the three-way electromagnetic valve 70, the other stators 44b-47b being connected to a coil of the other electromagnetic valve 70b. Current collecting stators 55-58 are connected to fixed contacts of a location switching switch 80, and multistage position control for the negative pressure cylinder 1 is performed by operation of the switch 80. |
