| 摘要 |
PROBLEM TO BE SOLVED: To enable a car washing customer to freely select a washing liquid at a terminal device side and to make a switching time difference of the washing liquid generated by a length of liquid-feed conduit buried in an underground or the like as less as possible in a systematized car washing machine. SOLUTION: When wax water injected at an intermediate pressure is selected, during the time until the wax water arrives at spray guns 8-10, a liquid-feed pressure is made to a high pressure and an amount of fed wax water is made larger than a defined amount. When it is injected from the spray guns 8-10, the liquid feed pressure is decreased to the intermediate pressure and the amount of wax water is returned to the defined amount. In the case where detergent water injected at a low pressure is selected, the similar operation is carried out. In the car washing machine provided with the spray guns 8-10 such that a diffusion nozzle having a small bore diameter and a nozzle for foaming detergent water having a large bore diameter are switchable, at the time of injection of the foaming detergent water, after remained water in flexible hoses 5-7 is discharged from the nozzle for foaming detergent water having a large bore diameter by feeding a compression air, the foaming detergent water is fed and injected.
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