Method for dispensing viscous materials a constant height above

Details Method for dispensing viscous materials a constant height above Method for dispensing viscous materials a constant height above

1991-09-09

1992-05-05

Fisher, Richard V.

Coating processes

Measuring, testing, or indicating

427 58, 427 96, 156356, B05C 1100, B05C 500

Patent

active

051106159

ABSTRACT:
A method is provided for dispensing viscous materials which first requires the step of providing a dispensing device for holding a quantity of a viscous material to be dispensed through a tip thereof. Next, the dispensing device is coupled to a dispensing control so that a metered amount of viscous material will be dispensed in response to a dispensing control signal. Next, the dispensing device is moved along an axis to selectively position the tip a predetermined distance away from the surface of a workpiece positioned adjacent thereto in response to an applied height control signal. The height control signal is generated by processing output signals from a camera which is moved along the axis with the dispensing device to determine when an image of the workpiece surface is maximally in focus. The final step of the method is to cause the dispensing control to apply the dispensing control signal to cause a metered amount of the viscous material to be dispensed from the tip of the dispensing device onto the workpiece surface.

REFERENCES:
patent: 4576481 (1986-03-01), Hansen
patent: 4661368 (1987-04-01), Rohde et al.
patent: 4724480 (1987-04-01), Hecker et al.
patent: 4760269 (1988-07-01), McKenna
patent: 4762578 (1988-08-01), Burgin, Jr. et al.
patent: 4814626 (1989-03-01), Doemens et al.
patent: 4816861 (1989-03-01), Taniguchi et al.

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