Paper sheet receiving/dispensing apparatus
A paper sheet receiving/dispensing apparatus includes strip films at least one of which is affixed, 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, and a storage device for storing a table that indicates an association between a roll outer diameter of the strip films wound around a winding drum and driving pulses of a stepping motor. The apparatus calculates the roll outer diameter based on the number of rotations of the winding drum, which is calculated based on detection pulses of the marks, and thicknesses of the strip films and a paper sheet, and controls rotations of the motor with driving pulses read from the table.
1. 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.
2. The paper sheet receiving/dispensing apparatus according to claim 1 , wherein
the intervals of the predetermined pattern are unequal intervals that sequentially become wider or narrower based on a predetermined rule.
3. The paper sheet receiving/dispensing apparatus according to claim 1 , wherein
the intervals of the predetermined pattern are constantly equal intervals.
4. The paper sheet receiving/dispensing apparatus according to claim 1 , wherein
if the roll outer diameter is smaller, the number of driving pulses is set to a larger number per second, or the pulse cycle is set to a narrower width, and
if the roll outer diameter is larger, the number of driving pulses is set to a smaller number per second, or the pulse cycle is set to a wider width.