| 摘要 |
PURPOSE:To inhibit the plugging of a spraying gun, in stopping its spraying motion, by performing the closing motion of a stopping mechanism and the opening motion of each control valve at the same time, in advance of the returning motion of a cylinder for driving a pressure pump as a pressing means. CONSTITUTION:During stopping spraying motion, the closing motion of the needle valve 5a of a stopping mechanism 5 and the opening motions of control valves 3 are performed at the same time. A time is started in concurrence with the motion of the control valves 3, to perform the returning motion of a cylinder 9 for driving a pressure pump in a state delayed in a certain time by said timer. Hence, at the stage of returning the cylinder 9, the control valves 3 are already opened to hold the interiors of Homal hoses 4A, 4B extending from the control valves 3 to a spraying nozzle part 2 under an unsealed condition without the formation of negative pressure. Thus, the plugging of the spraying nozzle part 2 is inhibited.
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