Boots – shoes – and leggings
Utility Patent
1998-02-27
2001-01-02
Terrell, William E. (Department: 3651)
Boots, shoes, and leggings
C222S077000, C222S055000, C177S025130
Utility Patent
active
06168305
ABSTRACT:
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,103,401 discloses a system for controlling the discharge rates of loss-in-weights feeder systems using an algorithm to filter the loss in weight of a container of material when a discharge of material from that container is taking place, the filtered loss then being compared to a desired loss and a proportional integral algorithm of the error being used to control the output signal controlling the speed of the discharge device to maintain the desired loss.
The major disadvantage of this and other loss-in-weight algorithms lies in the fact that the derivation of the loss is subject to disturbances from many influences. These disturbances cause a perturbation on the controlling output which in turn causes a perturbation in the loss of material. The resulting perturbation in the loss of material is in turn sensed by the control algorithm and an incorrect change in output is made. These disturbances can in severe cases lead to oscillation of the controlling output and hence erratic feeding of material.
SUMMARY OF THE INVENTION
The present invention overcomes these disadvantages and provides more stable control of the discharge of the material by maintaining a model of the weight loss with respect to discharge speed for control of the discharge speed wherein the model for weight loss is updated continuously only when the weight loss is constant and stable. The stability criterion may be user-set parameters.
This algorithm is always active and may be used in conjunction with the system of U.S. Pat. No. 5,103,401.
It is therefore an object of this invention to provide a loss-in-weight feeder system algorithm that is free of disturbances affecting existing loss-in-weight feeder system algorithms.
This, together with other objects of the invention, will become apparent from the following detailed description of the invention and the accompanying drawings.
REFERENCES:
patent: 3875383 (1975-04-01), Somerville et al.
patent: 4549620 (1985-10-01), Dee et al.
patent: 5103401 (1992-04-01), Johnson
patent: 5132897 (1992-07-01), Allenberg
patent: 5149080 (1992-09-01), Yamamoto
patent: 5260880 (1993-11-01), Tump
patent: 5341307 (1994-08-01), Myhre et al.
patent: 5524796 (1996-06-01), Hyer
Gray, Esq. John L.
Kegler Brown Hill & Ritter LPA
Merrick Industries, Inc.
Terrell William E.
Tran Knoi H.
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