| 摘要 |
In an apparatus for checking the condition of bank notes, each note is individually transported past a brush whose bristles are in contact with one face of the note. A piezoelectric bi-morph vibration sensor is attached to the brush, the voltage output from the sensor being dependent on the amplitude of vibration of the bristles of the brush brushing against a note. The poorer the condition of a note, i.e. the rougher that its surface is, then the greater will be the amplitude of vibration of the bristles. Thus, from the voltage output of the sensor it can be determined whether a note is of an acceptably good condition.
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