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Machine tool

  • US 6,402,442 B2
  • Filed: 05/07/2001
  • Issued: 06/11/2002
  • Est. Priority Date: 05/08/2000
  • Status: Expired due to Fees
First Claim
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1. A machine tool comprising:

  • a spindle, a clamp unit for fixing a tool in a taper hole provided in the spindle, the clamp unit including a holder for holding a holder portion of the tool, a driving rod coupled to the holder, a driver for moving the driving rod along an axis thereof, and a spring for biasing the driving rod in one direction along the axis thereof, whereby the driving rod is moved along the axis thereof by the driver and the spring and the tool is fixed in the taper hole of the spindle with the holder portion thereof held by the holder;

    a controlling section for controlling an operation of the clamp unit; and

    a service life end detecting section for counting a number of times of actuation of the clamp unit and, when a count of the number reaches a predetermined reference actuation number, judging that a service life of the spring ends.

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