| 摘要 |
The present invention relates to a circuit-switching device for a hooping machine and, in particular, to a device characterised by a rotary disc having a certain number of reflecting regions 18 and a corresponding number of non-reflecting regions 19, each located between two reflecting regions 18, a photocoupler 20 arranged at a suitable point distant from the reflecting region 18, a high-pass filter 21 connected to the photocoupler and a relay 23 connected to the high-pass filter. <IMAGE>
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