DETECTION SYSTEM FOR POWER EQUIPMENT

摘要

Woodworking machines including conductive cutters adapted to cut workpieces, and motors adapted to drive the cutters are disclosed. The machines also include a contact detection system adapted to detect contact between a person and the cutter, and to distinguish contact between the person and the cutter from contact between the workpiece and the cutter. The machines further include a reaction system adapted to cause a predetermined action to take place upon detection of contact between the person and the cutter by the contact detection system.

主权项

1. A woodworking machine comprising:
a cutter adapted to cut a workpiece; and a contact detection system adapted to detect contact between a person and the cutter, the contact detection system including: an excitation system adapted to supply an electrical signal having a first amplitude and period, the electrical signal being coupled to the cutter to induce a corresponding electrical signal of a second amplitude on the cutter, and a sensing system adapted to sense the second electrical signal induced onto the cutter, where the sensing system is adapted to detect contact between a person and the cutter based on a change in the sensed second electrical signal over a detection period, where the detection period is between 5 and 150 microseconds and at least twice the period of the first electrical signal.