Coating processes – Spraying
Patent
1999-02-04
2000-07-18
Beck, Shrive
Coating processes
Spraying
118302, 222148, 239113, 239119, B05D 102
Patent
active
06090450&
ABSTRACT:
An apparatus and method for painting a workpiece while switching paint colors between successive painting cycles includes a paint supply switching device, a paint feed line connected to the paint supply switching device, a separating element adapted to move back and forth in at least a portion of the paint feed line, first and second receiver stations adapted to receive the separating element at the end positions of its travel in the paint feed line, and a paint spray nozzle at a terminal end of the paint feed line. The separating element is actively held in the first receiver station while paint of a first color is supplied through the paint feed line and sprayed from the nozzle onto a workpiece. To switch to a paint of a second color, the supply of the first paint is terminated, the separating element is released from the first receiver station, and a pushing medium pushes the separating element through the paint feed line, while residual paint is pushed from the paint feed line out through the spray nozzle. The separating element forms a sealing barrier between the pushing medium and the residual paint. Sensors detect the arrival of the separating element in the second receiver station, and the flow of pushing medium is terminated to avoid spraying the pushing medium out through the spray nozzle. Then a pushing medium pushes the separating element back into the first receiver station.
REFERENCES:
patent: 2965114 (1960-12-01), Harden
patent: 4311724 (1982-01-01), Scharfenberger
patent: 5192595 (1993-03-01), Akeel et al.
patent: 5221047 (1993-06-01), Akeel
patent: 5289947 (1994-03-01), Akeel et al.
patent: 5326031 (1994-07-01), Konieczynski
patent: 5582350 (1996-12-01), Kosmyna et al.
Kahmann Ralf
Klein Udo
Ott Winfried
Weiss Volker
Beck Shrive
Calcagni Jennifer
Fasse W. F.
Fasse W. G.
LacTec GmbH Gesellschaft fuer Moderne Lackiertechnik
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