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Reliability monitoring system

  • US 4,130,787 A
  • Filed: 03/10/1977
  • Issued: 12/19/1978
  • Est. Priority Date: 03/10/1977
  • Status: Expired due to Term
First Claim
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1. A system for monitoring operation of a computer controlled machine tool, said machine tool including a machine control unit having an input operatively connected to said computer and an output operatively connected to said machine tool along an input-output bus, data on the input-output bus of said machine control unit operating said machine tool, comprising:

  • means for receiving idealized path data for said machine tool from the input side of said machine control unit;

    means for detecting changes of state in the transient data on the input-output bus of said machine control unit;

    means dedicated to the monitoring system for determining the actual position of said machine tool independently of any other tool position monitoring means;

    means for comparing the idealized path data for said machine tool with the actual position of the machine tool as determined by said dedicated means for determining actual machine tool position; and

    means for indicating machine tool malfunction when the data collected by said monitoring system from one of the input-output bus of the machine control unit and the actual machine tool position determined by the dedicated means for determining actual tool position falls outside a predetermined value.

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