Apparatus for electrostatically charging workpieces for spray co

Details Apparatus for electrostatically charging workpieces for spray co Apparatus for electrostatically charging workpieces for spray co

1974-04-10

1976-02-10

Stein, Mervin

Coating apparatus

With means to apply electrical and/or radiant energy to work...

Electrostatic and/or electromagnetic attraction or...

118630, B05B 502

Patent

active

039371808

ABSTRACT:
Disclosed herein are a method and apparatus for progressively charging an electrically isolated conductive workpiece from ground potential to high potential while the workpiece is supported by a moving grounded conveyor. A portion of the conveyor is selectively included in circuit with a high voltage source and a voltage divider to charge the isolated conveyed workpieces to high electrostatic potential with respect to ground. The highly charged workpieces are conveyed past a grounded spray device dispersing atomized particles (i.e., liquid or powder) which are at electrical ground potential. In accordance with well known electrostatic coating principles, the particles will be attracted to the high potential workpiece parts and will adhere thereto. As a more specific aspect of the invention, the high potential is applied to the workpieces through a unique "brush and commutator" apparatus which sequentially and gradually increases the charging of the workpiece from ground potential to a predetermined desired level for electrostatic spray deposition in a spray zone and thereafter sequentially gradually decreases the charge on the workpiece to ground potential after exiting the spray zone.

REFERENCES:
patent: 2553724 (1951-05-01), Ransburg
patent: 2655128 (1953-10-01), Ransburg
patent: 2805642 (1957-09-01), Tuttle et al.
patent: 3113037 (1963-12-01), Watanabe
patent: 3376156 (1968-04-01), Whitaker et al.

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