Automatic weighing machines

Details Automatic weighing machines Automatic weighing machines

1975-06-09

1977-08-09

Hartary, Joseph W.

Weighing scales

Weigher responsive material control

Discharge valve or gate

177122, 251205, G01G 1304

Patent

active

040404960

ABSTRACT:
The invention provides an automatic weighing machine for weighing out a predetermined quantity of fluid materials into a container. The machine includes a fluid material valve of the downward delivery type comprising a closure member having a plurality of selectable positions corresponding to different flow rates through the valve. A weighing control system is adapted to control the valve so as to dispense an appropriate weight of fluid material into the container in accordance with a predetermined program. The control system comprises one or more load cells arranged to provide an electrical output dependent upon the weight of the container plus its contents, and a comparator for comparing the signal from the load cell or cells with a predetermined target weight to be achieved in accordance with the program whereby to provide an electrical error signal instantaneously representative of the additional weight of fluid material to be dispensed. A control means sequentially adjusts the valve to lower flow rate positions in dependence upon both the magnitude of the error and the rate of change of the error.

REFERENCES:
patent: 924940 (1909-06-01), Rough
patent: 2763457 (1956-09-01), Gregory
patent: 2829856 (1958-04-01), Gregory
patent: 3106974 (1963-10-01), Williams

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