Coating processes – Nonuniform coating
Patent
1990-09-18
1993-02-16
Lawrence, Evan
Coating processes
Nonuniform coating
427 96, 118243, 118263, 118697, 901 43, B05D 500, B05D 126, B05C 102
Patent
active
051869829
ABSTRACT:
A method and an assembly useful for dispensing small quantities of liquid materials onto a workpiece. The assembly includes an applicator having a pin movable along a passageway from a retracted position to an extended position. As the pin moves to the extended position, a forward end of the pin picks up a small dot of the liquid materials and carries the dot to a position external of a housing of the applicator and into contact with a selected location on the workpiece. As the pin is retracted, a portion of the dot remains on the selected location and detaches from the pin. The assembly is particularly useful for dispensing small dots of solder paste at relatively high speeds in automated fashion at selected locations on a circuit board.
REFERENCES:
patent: 4110591 (1978-08-01), Trinchera
patent: 4159079 (1979-06-01), Phillips, Jr.
patent: 4332335 (1982-06-01), Fiorentini
patent: 4452917 (1984-06-01), Proksa et al.
patent: 4646676 (1987-03-01), Kidder et al.
patent: 4695482 (1987-09-01), Weiswurm
Blette Russell E.
Roeser John O.
Christoff James D.
Griswold Gary L.
Kirn Walter N.
Lawrence Evan
Minnesota Mining and Manufacturing Company
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