Nordson Corporation

John P Byers

Patrick T Hogan

Michael A Reighard

Richard G Christyson

Kenneth Zalewski

Drew Roberts

James D Powell

Alan Ray Lewis

Alec J Babiarz

Floriana Suriawidjaja

Jacques Mycke

Rick Zakrajsek

Jeffrey Minnich

Mark Van Der Heijden

A control system for use in a liquid dispensing system to measure and adjust a liquid spray pattern dispensed from the liquid dispensing system. The control system includes a sensor that detect edges of the liquid spray pattern and, from the detected positions of those edges, is operable to adjust the liquid spray pattern to a pattern width set by the operator. The control system is also operable to measure the width of the liquid spray pattern and the offset of the liquid spray pattern relative to a nozzle centerline of the liquid dispensing system and provide warnings to the operator if those measurements fall outside of acceptable ranges.

Method and apparatus for measuring and adjusting a liquid spray pattern

A first embodiment includes a control system which operates a spray gun to apply an even coating of flux to a circuit board or a plurality of different length circuit boards irrespective of the speed that the circuit board(s) move through a coating chamber. In a second embodiment, the control system pulses the spray gun on and off with a pulsing pattern that coats a plurality of zones of a circuit board with spray patterns of different length and thickness.

Method and control system for applying solder flux to a printed circuit

A system for accurately dispensing controlled amounts of viscous material. The system includes a pressurized supply of the viscous material, a dispenser connected with the pressurized supply and a feedback control for ensuring that a discrete dispensed amount corresponds closely to the desired dispensed amount for a particular application. The different methods of feedback control include changing pressure of the pressurized supply after measuring a dispensed amount and comparing the dispensed amount with a stored value representing the desired amount. Another manner of feedback control includes changing an air operating pressure associated with the dispenser. A third type of feedback control includes adjusting the duration that the dispenser is maintained on to dispense the viscous material. Each of these types of feedback control are preferably used in succession, as necessary, to ensure that the desired amount of viscous material is discharged from the dispenser. Methods of controlling an amount of viscous material discharged from a dispenser further include using one or more of the feedback controls described above.

Viscous material dispensing system and method with feedback control

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Avon Lake, OH, United States of America

John P Byers