Coating apparatus – Control means responsive to a randomly occurring sensed...
Patent
1990-06-08
1991-10-15
Hoag, Willard E.
Coating apparatus
Control means responsive to a randomly occurring sensed...
118686, 118400, 118429, 118500, 1984751, B05C 302, B05C 310
Patent
active
050564617
ABSTRACT:
A fixture for supporting a circuit board in a position generally horizontal to the surface of the protective material in the tank as it is dipped into a tank and coated with protective material. This allows a precisely predetermined area of the circuit board to be dipped into the protective coating material. The fixture has pivots above its center of gravity allowing the fixture to pivot will respect to a conveyor system so the position of the circuit board is maintained as generally horizontal to the surface of the protective material in the tank.
A weir is used to control the level of the surface of the protective material in the tank. Sonar is used for sensing the distance between the surface of the protective material and a fixed point. Jacks are used to adjust the level of the tank and thus control the depth to which said circuit board is dipped into said protective material so that the depth of each dip is controlled to a minimum of 0.38 mm. The invention allows only a predetermined portion of the circuit board to be coated with the protective material. Accordingly, there is no need for masking other portions of said circuit board with masking material and time is saved in producing the coated circuit boards.
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patent: 4597931 (1986-07-01), Watanabe et al.
patent: 4794018 (1988-12-01), Scheetz
patent: 4840821 (1989-06-01), Miyaki et al.
Hoag Willard E.
The Paint Line Supply Co., Inc.
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