Motion detecting system for use in a safety system for power equipment
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United States of America Patent
Stats
-
Apr 15, 2008
Grant Date -
Dec 7, 2006
app pub date -
Aug 18, 2006
filing date -
Aug 14, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A woodworking machine including a detection system adapted to detect a dangerous condition between a person and a working portion of the machine is disclosed. The machine includes a reaction system associated with the detection system to cause a predetermined action to take place relative to the working portion upon detection of the dangerous condition. A motion detection system is adapted to detect motion of the working portion and to disable the reaction system when the working portion is not moving. The motion detection system may sense whether motion in a machine has stopped by monitoring the back emf produced on the motor leads as the motor coasts to a stop. The woodworking machine may take the form of a saw, the working portion may be a blade adapted to cut when spinning, and the dangerous condition may be a person contacting the blade.
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