Magnetic thread reader
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United States of America Patent
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Jun 20, 2006
Grant Date -
Mar 11, 2004
app pub date -
Jan 7, 2002
filing date -
Jan 8, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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