| 摘要 |
A sheet dispenser mechanism (10) is described. The mechanism includes upper and lower transport guides (12, 14) for conveying a sheet such as a bank note therebetween, only one of the transport guides (12) being movable in a plane transverse to the surface of the bank note (38). A piezoelectric sensor (36) is mechanically coupled to the movable transport guide (12). A detecting circuit (52) monitors the output from the piezoelectric sensor (36). When a single bank note (38) is being transported the movable transport guide (12) is deflected by the thickness of the bank note and the detecting circuit (52) detects a first signal. If two sheets are stuck together and transported as a single sheet then the movable transport guide (12) is deflected by the thickness of the two sheets and the detecting circuit (52) detects a second signal which is greater than the first signal, thereby indicating that multiple sheets are present.
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