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Driving tool and method for controlling same

  • US 7,646,157 B2
  • Filed: 03/16/2007
  • Issued: 01/12/2010
  • Est. Priority Date: 03/16/2007
  • Status: Active Grant
First Claim
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1. A method for controlling a driving tool having a power source, a driver, an actuator, a follower, and a control unit, the power source including a motor and a flywheel that is driven by the motor, the actuator operable for selectively moving the follower to push the driver into frictional engagement with a surface of the flywheel, the control unit operable for selectively activating the electric motor and the actuator, the control unit including a speed sensor that is configured to sense a rotational speed of an element of the power source and produce a speed signal in response thereto, the method comprising:

  • directly determining a rotational speed of an element in the power source;

    controlling electrical power provided to the motor based on the rotational speed of the element in the power source to cause the flywheel to rotate at a predetermined speed; and

    actuating the actuator to move the follower when a set of actuating criteria has been met, the follower pushing the driver into contact with the surface of the flywheel as the flywheel is rotating.

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