Weighing scales – Shock absorber – damper – Electrical or magnetic
Patent
1975-10-28
1976-10-19
Hartary, Joseph W.
Weighing scales
Shock absorber, damper
Electrical or magnetic
177210, G01G 2310
Patent
active
039865711
ABSTRACT:
Weighing apparatus of the return-to-zero load compensation type is disclosed, characterized by the provision of voltage-responsive impedance means for modifying the pan position sensing signal to remove undesirable variations therein produced by interference or external vibrations or excessive swinging of the weighing pan by the load. In one embodiment, a dampening circuit is connected between the pan position sensing circuit and the control signal generating means for dampening sensing signals having an amplitude less than a given limit amplitude. In a second embodiment, the voltage-responsive means serves to render inoperable the differential section of a proportional-differential-integral controller when the pan position sensing signals are less than a given limit amplitude. In both embodiments, the voltage-responsive impedance means comprises a pair of diodes connected in polarity opposition in parallel in the corresponding signal-modifying circuit.
REFERENCES:
patent: 2914310 (1959-11-01), Bahrs
patent: 3133606 (1964-05-01), Thomson
patent: 3172493 (1965-03-01), Koch et al.
Kunz Peter
Strobel Felix
Hartary Joseph W.
Laubscher Lawrence E.
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