C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/125
C25D 5/02 (2006.01) H05K 3/24 (2006.01)
Patent
CA 1200528
ABSTRACT OF THE DISCLOSURE Printed circuit boards are carried generally vertically, along a path, with the tabs at the lower end being immersed in an electrolyte. The boards are automatically conveyed through opposed serially arranged pairs of rollers, which drive them along their path. Brushes wipe the boards to prevent contact with electrolyte above the desired contact level, as they are conveyed along the path. The solution is constantly replenished and turbulence pro- vided by delivering electrolyte solution, with insoluble metallic ions in it, by pumping the solution from a sump, through an array of nozzles along each side of the path, thus providing fresh electrolyte along with providing tur- bulence to the electrolyte. The nozzles are charged at a sufficiently low level to avoid their destruction. Electrical contact is made with the printed circuit boards, by means of serially engaging the boards with spring fingers of a continuous conductor along each side of the boards as they are conveyed along their path, and thereby conducting the applied charge to the immersed tabs, whereby the tabs function as cathodes for electrodeposition of metallic ions thereon The drive for the boards is provided by means of opposed pairs of rollers. One roller in each pair is a driving roller, with the opposing roller functioning as an idler, but forming an interference fit between the rollers as the boards are carried therebetween. The idler rollers are arranged in a bank, for adjustably being positioned to accommodate boards of various thick- nesses. The electrical connection with the upper ends of the boards may like- wise be adjustably positionable to accommodate boards of various heights.
412693
Ash James J.
Brady Joseph M.
Goffredo Daniel L.
Shakley Conrad D.
Atotech Deutschland Gmbh
Chemcut Corporation
Smart & Biggar
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