Dispensing – Processes of dispensing
Patent
1988-03-07
1989-06-27
Huppert, Michael S.
Dispensing
Processes of dispensing
222 55, 222559, 137 8, 1374875, 137805, 137831, 239 69, 2395331, 239583, 91361, 91364, G01F 900, G01F 186, B67D 508
Patent
active
048421626
ABSTRACT:
Apparatus and method for dispensing fluid materials wherein the fluid is discharged from a nozzle at a rate controlled by a metering valve having a seat and a stem moveable with respect to the seat to modulate the flow. A servo-actuator connected in a feedback control loop is used to position the valve stem with respect to its seat in accordance with a control signal. The control signal is derived in accordance with the difference between a driving signal representing a desired flow rate and the sum of a pair of feedback signals. One feedback signal represents the actual flow rate while the other feedback signal is correlated to both the relative velocity and position of the stem with respect to the seat. The position-dependent velocity signal is generated by a transducer comprising a magnet and a coil influencable by the field of the magnet as the magnet and coil move relative one another. For any given velocity, the magnitude of the position-dependent velocity signal is greater when the stem and seat are close together than when they are further apart so that as the valve closes, the amount of feedback increases.
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Brochure: ASEA Robotics, Inc., Industrial Robot System For Gluing and Sealing (date unknown).
Omega Pressure and Strain Measurement Handbook, p. A-22.
Ammeen Edward S.
Huppert Michael S.
Nordson Corporation
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