Pneumatic position controller for I.S. machine mechanism

Glass manufacturing – Control responsive to condition sensing means

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Details

65260, 65163, 65239, 65241, 65DIG13, C03B 3504, C03B 944

Patent

active

054257948

ABSTRACT:
A machine for forming glass containers from discrete gobs of molten glass comprising a mechanism displaceable between retracted and advanced position. A pneumatic actuator having upper and lower chambers controlled by a servo pneumatic valve controller, controls the displacement of the pneumatic actuator. A position lead based upon the actual position of the mechanism is calculated and differenced with a position demand to define a position delta. A position lag is calculated based on the position delta. The pressures within the upper and lower chambers are sensed and based thereon a force representative of the force being applied to the piston is calculated and differenced with the position lag to define a force error and a lag force is calculated based on the force error. The servo pneumatic valve controller is driven with the lag force.

REFERENCES:
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patent: 4427431 (1984-01-01), Mumford et al.
patent: 4494973 (1985-01-01), Perry
patent: 4529429 (1985-07-01), Wood
patent: 4623375 (1986-11-01), Cardenas-Franco et al.
patent: 4705552 (1987-11-01), Liska et al.
patent: 4783746 (1988-11-01), Cardenas-Franco

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