Paper sheet receiving/dispensing apparatus

A paper sheet receiving/dispensing apparatus of a strip film type for receiving a paper sheet by sandwiching the paper sheet between two strip films respectively held by two holding rollers, and by winding the paper sheet around a winding drum along with the strip films, and for dispensing the paper sheet by rewinding the strip films wound around the winding drum, comprising:

• a stepping motor for driving rotations of the holding rollers and the winding drum in forward and backward directions;
• the two strip films leaders of which are affixed on a winding shaft, on at least one of front and back sides, with marks at intervals of a predetermined pattern in a predetermined shape and in a color different from a color of the strip films;
• a detection sensor for detecting the marks;
• a storage device for storing a stepping motor slewing table that indicates an association between an index corresponding to a roll outer diameter of the strip films wound around the winding drum and the number of driving pulses or a pulse cycle of the stepping motor, which is specified by the index;
• and
• a controlling unit, wherein
• the controlling unit comprises
• pulse signal obtaining unit obtaining a pulse signal indicating that the marks have been detected by the detection sensor during running of the strip films,
• drum rotation number calculating unit calculating the number of rotations of the winding drum based on the number of pulses of the pulse signal obtained by the pulse signal obtaining unit,
• roll outer diameter calculating unit calculating the roll outer diameter based on the number of rotations of the winding drum, which is calculated by the drum rotation number calculating unit, and thicknesses of the strip films and the paper sheet, which are obtained in advance,
• driving pulse setting unit setting the number of driving pulses for the stepping motor based on the roll outer diameter calculated by the roll outer diameter calculating unit, and the stepping motor/slewing table stored in the storage device, and
• velocity controlling unit controlling a running velocity of the strip films to be a predetermined constant velocity by applying, to the stepping motor, the number of driving pulses set by the driving pulse setting unit.