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Tool holder for monitoring tool service time

  • US 4,890,306 A
  • Filed: 03/14/1988
  • Issued: 12/26/1989
  • Est. Priority Date: 03/30/1987
  • Status: Expired due to Fees
First Claim
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1. A tool holder holding a tool and replaceably attached to a main spindle of a machine tool, said tool holder comprising:

  • a body holding said tool;

    sensor means provided in said body for detecting whether or not said tool is used in a machining operation;

    counter means provided in said body for counting time cumulatively during the time when the output signal from said sensor means indicates that said tool is used, and for storing said cumulatively counted time as service time;

    output means provided in said body for outputting said service time held in said counter means to an outside circuit; and

    reset switch means provided on said body for resetting said counter means, whereby said counter means may be reset when said tool is reground or replaced.

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