B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
B05B 5/10 (2006.01) B05B 5/08 (2006.01)
Patent
CA 2060683
REPULSION DEVICE FOR LOW CAPACITANCE ELECTROSTATIC PAINTING SYSTEMS Abstract of the Disclosure An electrostatic repulsion device is pro- vided in an electrostatic spray paint booth having a grounded ceiling and conveyor to improve transfer efficiency in applying the paint to a workpiece and maintain a safe working environment without requiring protective fencing between an operator and the appli- cation equipment. The device includes a length of electrical cable having a central resistive conductor and an insulation layer. The cable is designed to produce low electrical capacitance in operation when connected to a high voltage source. Conductive pins are mounted along the cable through the insulation to contact the conductor. The conductive pins are arranged parallel to the spray path in two longitudi- nal groups, with the first set being diametrically opposed to the second set. Each conductive pin has a discharge end that is substantially flush with the outside surface of the insulation of the electrical cable. The device is transversely mounted with respect to a spray path of charged, atomized paint particles dispensed from a non-conductive, rotary atomizer or low capacitance spray gun, so that an electrostatic field from the first set of conductive members repels the atomized, charged paint particles away from the grounded ceiling and conveyor of the paint booth towards a workpiece. The electrostatic field produced by the second set of conductive members bleeds accumulated charge from the low electrical capacitance repulsion device before a high energy spark or discharge can occur whenever a grounded operator or object comes into proximity with the device. This safety feature eliminates the need for protective fencing and interlocks within the spray booth.
Corporation Nordson
Macrae & Co.
LandOfFree
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