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US 2006/0124782 A1Published application
Spray gun for electrostatic painting
AssigneeAnest Iwata Corporation
InventorsTakuya Matsumoto, Yasuhiro Ochii, Atsushi Morohoshi
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AssigneeAnest Iwata Corporation
InventorsTakuya Matsumoto, Yasuhiro Ochii, Atsushi Morohoshi
Estimating the term…
A spray gun for electrostatic painting in which an external electrode sustaining a high voltage can be fixed/removed while sustaining insulation from a spray unit on the ground potential side by limiting current supply to paint appropriately when electrostatic painting is performed using conductive paint e.g. water based paint, and safety and handling performance are enhanced while ensuring the painting efficiency as the spray gun for electrostatic painting. On the outside of the spray gun (1) having the spray unit (5) at the forward end thereof, the external electrode (7) having an electrode projecting from the forward end part thereof is provided removably at the part (13) of the gun body being connected with the electrode while being separated from the paint passage such that it can be replaced readily. The part being connected with a high voltage output end part through a high resistor for limiting current can be shortened while sustaining safety by providing a turn-up part so that a sufficient creeping discharge preventing distance is ensured up to the exposed part on the outer surface. Furthermore, the electrode body itself is simplified so that it can be replaced with one touch, and it is composed of a flexible resilient material in order to prevent damage.
An electrostatic-painting spray gun including an atomizer provided at the forward end thereof and an external charging electrode disposed outside, and projected ahead of, the atomizer while being separated, with an electric insulation being kept, from a passage through which a paint is supplied to the atomizer;
An electrostatic-painting spray gun including an atomizer provided at the forward end thereof and an external charging electrode disposed outside, and projected ahead of, the atomizer while being separated, with an electric insulation being kept, from a passage through which a paint is supplied to the atomizer;
An external charging-type electrostatic-painting spray gun including an atomizer provided at the forward end thereof and a charging electrode provided outside the atomizer while being separated, with an electrical insulation being kept, from a passage through which a paint is supplied to the atomizer, wherein:
An external charging-type electrostatic-painting spray gun including an atomizer provided at the forward end thereof and a charging electrode provided outside the atomizer while being separated, with an electrical insulation being kept, from a passage through which a paint is supplied to the atomizer, wherein a forward-end electrode is disposed in such a manner that any streamer discharge will be prevented from occurring toward a paint spray nozzle of the atomizer and the electrode will gradually be opened from the center axis of spraying as it goes away from the end of spray not to be applied with the end of paint spray flow.
An electrostatic-painting spray gun including a high-resistance resistor of more than 150 MΩ provided between a forward-end electrode and high voltage output, wherein the forward-end electrode is disposed in such a manner that in case the discharge current from the forward-end electrode be maintained at 60 to 150 μA with a charging voltage of −70 kV being applied, any streamer discharge will be prevented from occurring toward a paint spray nozzle of the atomizer and the electrode will gradually be opened from the center axis of spraying as it goes away from the end of spray not to be applied with the end of paint spray flow.
Dependencies are inferred from the claim text.