To provide a double-feed detecting method which can accurately determine double feeding according to a thickness detection value of a check, even if the maximum thickness of the check to be carried is more than double as thick as the minimum thickness, and to provide a paper sheet processing device.
The double-feed detection system 1 includes a thickness detector 3 configured to detect the thickness of the check 4 carried in a carrying passage 101 of a check reading device 100, and the thickness of the passing check 4 is sampled from the thickness detector 3 in a fixed period. Change amount Δt of the sampled detection thickness is successively calculated, and the calculated change amount Δt of the sampled detection thickness is compared with a predetermined threshold value Th2. When the change amount Δt is more than the threshold value Th2, the check 4 is determined to be double-fed. In order to prevent the degradation in determination accuracy due to error components of the detection value, detection values are successively extracted by plural pieces in a sampling order, and an average value of them is calculated, and then double feed determination is carried out according to the calculated change amount of each average value.
| JP7298367 | Reader and double feed detection method |
| JPS58176833 | 【考案の名称】紙葉重複送り検出回路 |
| JPH06298405A | 1994-10-25 | |||
| JP2005225581A | 2005-08-25 | |||
| JP2003012192A | 2003-01-15 |
Osamu Suzawa
Kazuhiko Miyasaka