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Position feedback control method and power tool

  • US 10,377,008 B2
  • Filed: 10/30/2015
  • Issued: 08/13/2019
  • Est. Priority Date: 10/30/2015
  • Status: Active Grant
First Claim
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1. A power tool, comprising:

  • a chuck having a distal end configured to secure a tool; and

    a motor configured to rotate the chuck and the tool secured to the chuck;

    a first position sensor comprising;

    a first radiation source configured to project first radiation toward a workpiece; and

    a first radiation receiver configured to receive the first radiation reflected by the workpiece and generate, based on the first radiation received by the first radiation receiver, a first signal that is indicative of a first distance between the first position sensor and the workpiece;

    a second position sensor comprising;

    a second radiation source configured to project second radiation toward the workpiece; and

    a second radiation receiver configured to receive the second radiation reflected by the workpiece and generate, based on the second radiation received by the second radiation receiver, a second signal that is indicative of a second distance between the second position sensor and the workpiece; and

    a controller configured to;

    determine, based on the first signal, the first distance between the first position sensor and the workpiece;

    determine, based on the second signal, the second distance between the second position sensor and the workpiece;

    generate an output signal indicative of whether the first distance and the second distance specify a first angle of the power tool with respect to the workpiece that is within a predetermined range;

    retain any of the first distance and the second distance that is greater than a distance between a respective one of the position sensors and the distal end of the chuck;

    determine, based on the retained distances, a measurement of a drive depth of the tool into the workpiece; and

    generate, based on the measurement, one or more control signals that control operation of the motor.

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