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System for measuring the longitudinal or angular displacement of a movable component

  • US 3,982,106 A
  • Filed: 11/10/1975
  • Issued: 09/21/1976
  • Est. Priority Date: 05/14/1973
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring the longitudinal or angular displacement of a component, comprising a scale carrier adapted to be supported by the component and movable in a predetermined measurement direction, said scale carrier having a first track comprising an increment scale subdivided into equal graduation units, first stationary reading means defining a first reading location for reading the graduation units moving past the reading location, evaluation means in circuit with said first reading means and comprising an increment counter for the continuous storage of the algebraic sum of the graduation units of the increment scale moving past said first reading location and read by said first reading means, the movable scale carrier possessing a second track arranged substantially parallel to the increment scale, said second track containing a multiplicity of absolute value markings, each marking possessing a predetermined spacing from the next following marking, second stationary reading means defining a second reading location for reading the absolute value markings moving past the second reading location, said evaluation means including means for counting each said spacing in graduation units of the increment scale, the spacing of each marking from the next following marking characterizing an absolute value of its spacing from a null position, said evaluation means including a fixedly programmed allocation device, said evaluation means including means for determining the number of graduation units of the increment scale which have been counted sign-correct at the increment counter from the time of throughpassage of any given one of the absolute value markings up to the throughpassage of the next following absolute value marking, said evaluation means further ascertaining for said characteristic spacing value the associated correct absolute value from said fixedly programmed allocation device and correcting any possibly previously incorrect counter state of the increment counter to the correct absolute value.

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