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AssigneeDe La Rue International Limited
InventorsJohn Buttifant, John Alan Skinner, Peter Dilwyn Evans, Michael Potter, Peter Alan Pullan, Barry Clifford Scowen
Estimating the term…
A method of detecting a magnetic thread comprises causing relative movement between the thread and an array of magnetic heads, each head generates a signal upon detecting a portion of the thread. The arrival of a thread at one of the heads is detected, that head being denoted a primary head, and the head on each side a secondary head. Output signals from the primary and secondary heads are monitored to generate a representation of the thread, and the magnitude of the signals from the primary and secondary heads are compared such that if the magnitude of the output signal from a secondary head exceeds that from the primary head, the primary and secondary heads are reallocated accordingly.
A method of detecting a magnetic thread comprising causing relative movement between a thread and an array of magnetic heads, each of which generates a signal upon detecting a portion of the thread;
Apparatus for detecting a magnetic thread comprising an array of magnetic heads each of which is connected to a respective processor which processes signals generated by the associated magnetic head;
Dependencies are inferred from the claim text.