Electric tool and controlling method thereof
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United States of America Patent
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Oct 20, 2015
Grant Date -
Dec 15, 2011
app pub date -
Jan 4, 2010
filing date -
Jan 4, 2009
priority date (Note) -
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Abstract
A power tool including a motor for rotatably driving a tool bit at an attained rotational speed, a source for supplying an electric current to the motor, a sensor for measuring the current, and a control device. The control component fulfills the task of detecting a variation of the slope of the current in the course of time, and generates a control signal. The rotational speed of the tool is reduced in response to the control signal. The power tool automatically detects whether the work piece operated by the tool bit reaches a predetermined position by electronic control means. It may make sure that the screw is driven into a piece of wood and does not go beyond the predetermined position once it detects that the work piece reaches the position and carries out a changing action.
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