| 摘要 |
A slot detecting apparatus comprises a sensor for detecting a slot of a workpiece, comparators, and a discriminating circuit. The sensor moves over the workpiece so as to traverse the slot and produce an output having a waveform which is substantially an M-shape. The comparators compare the level of the output of the sensor with a plurality of threshold levels which are mutually different, and each produce a comparison result for each of the plurality of threshold levels. The discriminating circuit discriminates the position of the slot based on a comparison result which indicates that the output of the sensor has a waveform which is substantially an M-shape, from among a plurality of comparison results which are obtained from the comparators for the plurality of threshold levels.
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