Non-transitory recording medium and paper sheet handling apparatus

A paper sheet handling apparatus comprising:

• a displacement amount detector that includes a pressing part intended to press a paper sheet against a transporting face of a paper sheet transporting path and having an initial position at which the pressing part is not in contact with the transporting face of the paper sheet transporting path, the displacement amount detector detecting a displacement amount of displacement of the pressing part from the initial position in a direction perpendicular to the transporting face, the pressing part being displaced according to a thickness of a paper sheet passing between the transporting face and the pressing part;
• a reference displacement amount storage that stores a reference displacement amount;
• a paper sheet thickness storage that stores a thickness of one paper sheet;
• a tape thickness threshold storage that stores a tape thickness threshold;
• a determinator that, on the basis of the displacement amount detected by the displacement amount detector, the reference displacement amount stored by the reference displacement amount storage, the thickness of one paper sheet stored by the paper sheet thickness storage, and the tape thickness threshold stored by the tape thickness threshold storage, determines which of one paper sheet, a paper sheet having tape applied thereto, two paper sheets laid on top of one another, or another paper sheet is passing between the transporting face and the pressing part;
• a reference displacement amount updater that, when the determinator makes a determination that one paper sheet is passing between the transporting face and the pressing part, updates a value of the reference displacement amount stored by the reference displacement amount storage to a displacement amount detected by the displacement amount detector at a time of the determination;
• a paper sheet thickness calculator that, when the determinator makes a determination that two paper sheets laid on top of one another are passing between the transporting face and the pressing part, calculates a thickness of one paper sheet by subtracting the reference displacement amount stored by the reference displacement amount storage from a displacement amount detected by the displacement amount detector at a time of the determination;
• a paper sheet thickness updater that updates the thickness of one paper sheet stored by the paper sheet thickness storage to the thickness of one paper sheet calculated by the paper sheet thickness calculator;
• a tape thickness threshold calculator that calculates a tape thickness threshold on the basis of the thickness of one paper sheet calculated by the paper sheet thickness calculator;
• and
• a tape thickness threshold updater that updates the tape thickness threshold stored by the tape thickness threshold storage to the tape thickness threshold calculated by the tape thickness threshold calculator.