Solder paste dispenser for smd circuit boards

Abstract From the Canadian patent

A device for discretely controlled deposition of very small quantities of a viscous fluid at each of a succession of locations according to a digital X-Y-Z program. The primary application is for deposition of a slurry of small solder particles in a viscous fluid such as, for example an organic, acid RMA standard flux on a programmed succession of conductive pads or loci on or above the surface of a typical SMD circuit board. A pumping valve driven by pneumatic pressure effects a uniform deposition during the dwell time at each location. A free-piston syringe driven by pneumatic pressure supplies the slurry to a chamber within the pumping valve barrel which feeds a small orifice (such as …