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Rotary atomizing electrostatic coating apparatus
| Details |
Inventors: Kazama, Shigenori; Sasaki, Ryo; Kubota, Kayo; Aizawa, Akihiko;
Assignee: Nissan Motor Co., Ltd. (Yokohama, JP)
Primary Examiner: Kashnikow; Andres
Assistant Examiner: Ganey; Steven J.
Attorney, Agent or Firm: Foley & Lardner
A rotary atomizing electrostatic coating apparatus having a rotating spray head, and a paint nozzle for feeding paint on the front surface of the spray head, in which the spray head is comprising a spray head main body made of an electrically insulating material, and a plurality of discharge electrodes having nearly band-form pattern extending outward approximately along the rear side shape of the spray head main body from the central side of the spray head main body with a mutual phase difference or extending symmetrically about the axis of rotation of the spray head main body. The plurality of discharge electrodes rotate together with the spray head main body, and the discharge current in the front side direction of the axis of rotation of the spray head is made uniform and increased, thereby enhancing the painting efficiency. |
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DETAILED DESCRIPTION It is hence an object of the invention to present an improved rotary atomizing electrostatic coating apparatus.
It is also an object of the invention to present a rotary atomizing electrostatic coating apparatus capable of increasing uniformly the discharge current in the front area portion of a rotary shaft of a spray head, and improving the painting efficiency.
The inventors, as a result of intensive research for solving the problems in the conventional apparatus as mentioned above, accomplished an improvement of the structure of the spray head, such as cup 2 shown in FIG.
1.
Namely, by using the spray head main body made of an electrically insulating material, and disposing a discharge electrode 8 of a specific shape at the rear side of this electrically insulating spray head main body, comparing with the case of the spray head made of conductive material, the inventors have discovered that the corona discharge current during the atomizing process of the metallic paint could be increased.
Moreover, by modifying the shape of the discharge electrode 8 located at the rear side of the spray head main body 2, the distribution pattern of discharge current toward the object was averaged, and in particular it was found that the discharge current formed in the front area portion of the rotary shaft of the spray head main body 2 can be increased, thereby leading to the present invention.
That is, the present invention to solve the above problems relates to a rotary atomizing electrostatic coating apparatus having a specific rotating spray head main body 2 as shown in FIG.
1.
The rotary atomizing electrostatic coating apparatus further comprising means for feeding paint onto the front plane of the spray head 2, in which the spray head is made of electrically insulating material, and (at the rear side of the spray head 2) a plurality of discharge electrodes 8 formed in band patterns extending outward almost along the rear shape of the spray head main body from the central side of the spray head, disposed at a mutual specific phase difference around the rotary shaft of the spray head as shown in FIG
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Semiconductor manufacture 
