B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
222/11
B05B 12/02 (2006.01) B05B 12/08 (2006.01) B05B 13/04 (2006.01) B05C 5/02 (2006.01) B05D 1/02 (2006.01) G05D 7/06 (2006.01)
Patent
CA 1300088
ABSTRACT APPARATUS AND METHOD FOR DISPENSING FLUID MATERIALS Apparatus and method for dispensing fluid material whereby the fluid is discharged from a nozzle onto a workpiece. Delivery of fluid to the nozzle is controlled by a metering valve located in close proximity to the nozzle. The flow of dis- pensed fluid is sensed by a pressure transducer disposed to sense the pressure drop across the nozzle. The pressure transducer generates a feed- back signal which can be applied by way of a closed loop control system to an electropneumatic servo- valve which operates a double-acting air cylinder which in turn operates the metering valve to control the pressure drop across the nozzle thereby con- trolling the flow of dispensed fluid in accordance with a driving signal. Where the dispenser is carried by a robot, the driving signal can be cor- related to the relative speed between the workpiece and the nozzle to accurately control the amount of fluid per unit length contained in a bead deposited on the surface of the workpiece. Due to the rapid response of the system such precise control is possible even during relatively rapid changes in the Abstract (cont'd) relative speed between the nozzle and the workpiece. Also disclosed are means for insuring that the volume of fluid dispensed over a predetermined interval corresponds to a desired setpoint thereby correcting for changes in the intrinsic viscosity of the dispensed fluid as may be caused by changes in its temperature.
546806
Corporation Nordson
Macrae & Co.
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