Patent ID: 8136705

Claim:
A dispenser for dispensing a volume of viscous material on a substrate, the dispenser comprising: a frame; a gantry system coupled to the frame; a dispenser unit coupled to the gantry system, the dispenser unit comprising a housing having a chamber, a piston disposed in the chamber, the piston having an elongate body, the piston being configured to move between a pre-dispense position and a dispense position within the chamber, a motor to drive the movement of the piston within the chamber, the motor comprising a rotating shaft, a wheel coupled to the rotating shaft, the wheel having at least one drive magnet, and a driven magnet disposed between wheel and the piston, wherein the motor comprising a plurality of drive magnets disposed circumferentially around the wheel; and a nozzle coupled to the housing, the nozzle having an orifice to dispense viscous material.