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Numerical control unit that pre-announces scheduled operations

  • US 5,428,547 A
  • Filed: 07/09/1992
  • Issued: 06/27/1995
  • Est. Priority Date: 07/10/1991
  • Status: Expired due to Term
First Claim
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1. In a numerical control unit for performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

  • a clock for counting a cycle signal and updating an initial time to generate a current time;

    initial time setting means for setting said clock at a selectable initial time;

    current time reading means for reading a current time from said clock;

    a time memory table for storing at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

    expected run time setting means for storing in said time memory table at least one of said first expected run time and said second expected run time;

    time expecting means for operating on at least one of said first expected run time and second expected run time from said table and a current time from said clock and thereby generating a corresponding first expected end time, comprising the end of said run, and a second expected end time, comprising the time of specified command execution;

    automatic start detecting means for detecting the start of the machining command program run; and

    wherein said current time reading means is operative to read the current time in response to the detection by said automatic start detecting means of the start of the machining command program run, andin response thereto, said time expecting means operates on at least one of said first expected run end time and said second expected run end time from said time expecting means and said first expected run time and second expected run time stored in said time memory table.

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