| 摘要 |
PURPOSE: A sensor for bottom thread by recognition of wireless frequency is provided to accurately sense loose of the bottom thread which is wound in a bobbin and to stop the operation. CONSTITUTION: A sensor for bottom thread by recognition of wireless frequency comprises: an elastic contact point(11) of a wireless frequency recognition switch(10) in a bobbin(1) in which the bottom thread(100) is wound; an RFID(Radio Frequency IDentification Switch) tag(12) which is fixed at the side(2) of the bobbin; an antenna which is electrically contacted through the RFID tag and elastic contact point and transfers signal wave.
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