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Compensation scale for measuring the weight or mass of an object

  • US 5,347,092 A
  • Filed: 07/20/1992
  • Issued: 09/13/1994
  • Est. Priority Date: 01/20/1990
  • Status: Expired due to Fees
First Claim
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1. A compensation scale comprising,a movably guided component that is deflected from a predetermined position relative to a carrier of the scale in at least one direction by a load whose weight or mass is to be determined;

  • an electromagnetic arrangement which includes at least one coil for generating a force relative to the load;

    a lever coupled to the movably guided component and mounted to move about a pivot point for influencing the force generated by the electromagnetic arrangement relative to the load;

    a position sensor which determines the position of the movable component relative to the carrier and outputs a signal;

    a controller which determines current flowing through the coil as a function of the signal output by the position sensor so that the movable component returns to the predetermined position with the current being a measure for the weight or the mass of the load, the controller producing an uncorrected measuring result signal related to the current;

    at least two acceleration sensors disposed at the movable component for determining the translatory acceleration in the at least one direction and a rotational acceleration of the movable component about a rotation axis passing through the pivot point and essentially perpendicular to the lever, the acceleration sensors outputting signals to a correction signal processing arrangement which determines at least one correction signal for correcting the uncorrected measuring result signal representing the measure for the weight or mass of the load to produce a corrected measuring result signal.

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