Detection system for power tool

Details Detection system for power tool Detection system for power tool

2008-10-03

2010-06-22

Alie, Ghassem (Department: 3724)

Cutting

With randomly actuated stopping means

C083S062100, C083S490000, C083S477100, C083S477200, C083S581000, C700S001000, C700S010000, C700S021000

Reexamination Certificate

active

07739934

ABSTRACT:
Power tool includes a movable blade and a detection system for detecting contact between the blade and an object. Detection system includes an excitation plate capacitively coupling the drive signal to the movable blade. A circuit generates an in phase component signal and a quadrature component signal from a blade current signal indicative of the instantaneous current drawn by the movable blade and calculates an energy of the blade current signal considering the in-phase and the quadrature components. The circuit compares the energy of the blade current signal to an adaptive trigger threshold to detect contact between the blade and the object based on whether the energy of the blade current signal is greater than the adaptive trigger threshold.

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