Patent ID: 6082289
Filing Date: 2000-07-04
Classification: B05C,H05K

Abstract:
A liquid dispensing system for receiving liquid from a liquid source and for dispensing on a medium at a high rate small amounts of the liquid, the system comprising:a pump assembly including:a housing, anda cartridge including a chamber for receiving liquid from the liquid source and a nozzle assembly through which the liquid is dispensed, said cartridge being mounted in said housing and being slideably movable relative to the housing between a lower first position in which said nozzle assembly of said cartridge dispenses the liquid, and an upper second position at which said cartridge does not dispense the liquid, wherein when in the lower first position, the nozzle assembly is spaced a predetermined distance above the medium;a controller for controllably causing said cartridge to move between said first and second position; andan inlet in the housing for receiving a fluid, the fluid moving said cartridge from said one of said first position and said second position to the other of said first position and said second position when the fluid is introduced, wherein said fluid is a gas;wherein the cartridge includes an annular piston and the housing includes an annular bushing around the cartridge, the bushing having an annular face adjacent an annular face of said annular piston when said cartridge is in one of said first and second positions, the fluid increasing a gap between said annular piston and said annular bushing.