Edge finder

The utility model discloses an edge finder which comprises a base, an upper cantilever and a lower cantilever are fixedly installed on the base, a magnetic column is fixedly installed on the upper cantilever, and a lower contact is arranged on the lower cantilever. One end of the elastic piece is fixedly connected with the base, the other end of the elastic piece is connected with the circuit board, a magnet is fixed on the circuit board and located under the magnetic column, the magnetic pole of the upper end of the magnet is the same as that of the lower end of the magnetic column, the circuit board is provided with an upper contact, and the upper contact makes contact with the lower contact under the repelling acting force of the magnetic column and the magnet. And the T-shaped limiting piece penetrates through the hole and is fixedly connected with the lower cantilever. The copper plate plays a role in lower limit supporting and electric conduction, the copper nail plays a role in upper limit, and when a