Metering dispenser with screw pump

The combination of a dispensing system for dispensing a controlled quantity of a high viscosity material for application to a substrate, and a robotic system used therewith, comprising:

• reservoir means for holding the high viscosity material;
• nozzle means adapted to be manipulated by the robotic system in response to commands generated thereby;
• a screw pump having an inlet port communicating with said reservoir means and an outlet port connected to said nozzle means, said screw pump comprising a stator formed with a spiral cavity and a sprial rotor rotatably disposed within said cavity;
• a variable speed type drive motor having its drive shaft connected to the rotor of said screw pump;
• means responsive to said commands for determing the velocity of said nozzle means and providing a first signal representative of the velocity of the nozzle means;
• sensor means for sensing the rotational speed of said drive motor and providing a second signal representative of the motor speed;
• means responsive to said first signal for providing a third signal representative of a desired motor speed;
• and
• means responsive to said second and third signals for providing a motor drive signal supplied to said drive motor, whereby the nozzle means delivers a controlled quantity of the high viscosity material as it moves over the substrate.