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US4316516: Weighing balance with automatic zero correction

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Filing Information

Inventor(s) Walter Kupper ·
Assignee(s) Mettler Instrumente AG ·
Attorney/Agent(s) Marianne Rich ·
Primary Examiner Miller, Jr.; George H. ·
Application Number US6195331
Filing date 10/09/1980
Issue date 02/23/1982
Predicted expiration date 10/09/2000
U.S. Classifications 177/25  · 177/50  ·
International Classifications G01G 1904  ·
Kind CodeA
International Classifications 17725;50;185;210 FP;DIG. 3 ·
Foreign Priority CH1130979 - 12/20/1979 ·
3 Claims, No Drawings


Abstract

When the difference between the weight proportional signal and the tare value is less than a predetermined threshold value, it is assumed that the zero point is changing. Main difference signals less than the threshold signal are stored and subsequently generated ones algebraically added to the first one. The so-created cumulative difference signal is compared to a predetermined limiting value. When it exceeds the limiting value the cumulative difference signal is divided by the number of differences which together created the cumulative difference signal. The so-formed average difference signal is added to the tare value prior to generation of the next main difference signal.

Independent Claims | See all claims (3)

  1. 1. In weighing method comprising the steps of periodically generating digital weight proportional signals, comparing said weight proportional signals to a reference signal and generating main difference signals corresponding to the difference therebetween, comparing said main difference signals to a predetermined threshold signal and furnishing a first or a second difference signal when said main difference signal is, respectively, less than or at least equal to said predetermined threshold signal, and displaying only said second difference signal, the improvement comprising the steps ofstoring a first difference signal; algebraically adding subsequently generated first difference signals to the so-stored first difference signal, thereby creating a cumulative first difference signal;comparing said cumulative first difference signal to a predetermined limiting value and furnishing a comparator output signal only when said cumulative first difference signal exceeds said limiting value;counting the number of first difference signals received until said cumulative first difference signal exceeds said limiting value signal and furnishing a counting signal signifying the number of so counted first difference signals;dividing said cumulative first difference signal by said counting signal thereby creating an average difference signal; andwherein said average difference signal is applied to said weight proportional signals or said reference signal when generating said main difference signals.
  2. 3.3. In weighting apparatus having means for periodically generating digital weight proportional signals, first comparing means for comparing said weight proportional signals to a reference signal and generating main difference signals corresponding to the difference therebetween, second comparing means for comparing said main difference signals to a predetermined threshold signal and furnishing a first or a second difference signal when said main difference signal is less than or at least equal to said threshold signal, respectively, automatic zero correcting apparatus comprisingmeans for storing a first difference signal in a first predetermined storage (32);means for algebraically adding subsequently furnished first difference signals to the so-stored first difference signal, thereby creating a cumulative difference signal;means for comparing said cumulative difference signal to a predetermined limiting value and furnishing an excess difference signal when said cumulative first difference signal exceeds said predetermined limiting value;means for counting the number of first difference signals together constituting said cumulative first difference signal and furnishing a counting signal signifying the so-counted number of first difference signals;means for dividing said cumulative first difference signal by said counting signal, thereby creating an average value difference signal; andmeans for applying said average value difference signal to said first comparing means so that said comparing means generates said main difference signal in part in dependence on said average value signal.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3665169 FAIRBANKS MORSE INC Henderson et al. May 1972
US3786884 METTLER INSTRUMENTE AG Allenspach Jan 1974
US3797595 MANGOOD CORP Yin et al. Mar 1974
US3860802 SARTORIUS WERKE GMBH Knothe et al. Jan 1975
US3986012 Reliance Electric Company Loshbough et al. Oct 1976
US4044846 MATILAINEN WALTTERI Matilainen Aug 1977
US4137979 Ltd. Kubota Itani Feb 1979