System for precisely controlling discharge rates of loss-in-weig

Details System for precisely controlling discharge rates of loss-in-weig System for precisely controlling discharge rates of loss-in-weig

1989-11-21

1992-04-07

Lall, Parshotam S.

Boots, shoes, and leggings

177105, 222 56, 222 58, G01G 1108, G01G 1316, G06F 1520

Patent

active

051034018

ABSTRACT:
System for controlling the discharge rate of a material feeder. A weight scale connected to the material is sampled and the samples input to a digital processor. The digital processor determines for consecutive time intervals during discharge of said material, a weight loss over the time interval. The weight loss for the interval is compared with a desired weight loss which is calculated from a desired setpoint material discharge rate. The resulting error is averaged with subsequent errors to form a control signal for the material feeder. The calculation of errors over each subsequent interval increases the resolution of the control signal, increasing the ability to control discharge rates to compensate for changes in material density which otherwise affect discharge rates.

REFERENCES:
patent: 4164260 (1979-08-01), Blodgett
patent: 4301510 (1981-11-01), Ricciardi et al.
patent: 4754822 (1988-07-01), Altenpohl et al.
patent: 4882784 (1989-11-01), Tump

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