Importance

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Abstract

When conductive paint is coated by electrostatic coating, the electrostatic charging has many problems. The external electrode is prevailingly used in most of the electrostatic coating spray guns but has many problems in operability, safety, practical usability, etc. when the guns are designed compact. The electrostatic coating spray guns need to be improved in operability, safer with electrostatic charging at a lower voltage, and smaller in structure. To solve such problems, there is provided an improved electrostatic coating spray gun (1) in which an atomizer (2) is provided at the front end thereof to atomize paint jet from a paint nozzle (25) disposed at the center of the atomizer (2) and electrostatically charge the atomized paint particles at a high voltage for attraction to an object to be coated, set at ground potential, charging electrodes (6) as external electrodes are provided on the inner front surface of an air cap (20) or the inner surface of the air cap (20) and a compressed air passage is formed between a paint jet port (26) at the ground potential and the charging electrodes (6). At charging, compressed air prevents discharge from the charging electrodes toward the paint at the ground potential to efficiently ensure ionizing discharge with necessary potential being retained at the charging electrodes (6) and effective charging of paint particles. Since voltage drop is thus prevented, a lower voltage may be used for necessary charging of the paint particles.

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First Claim