Bill aligning apparatus

1. An apparatus for aligning a bill supplied onto a transfer path with a center line of the transfer path, the apparatus comprising:

a first centering roller arranged at one side of the transfer path to be inclined towards the center line and applying a frictional force to a portion of the bill positioned at one side of the transfer path so that the bill is moved to the center line, the first centering roller having a first driven wheel formed in a border part to face one edge line of the transfer path; and

a second centering roller arranged at the other side of the transfer path to be inclined towards the center line and applying a frictional force to another portion of the bill positioned at the other side of the transfer path so that the bill is moved to the center line, the second centering roller having a second driven wheel formed in a border part to face the other edge line of the transfer path,

wherein the first driven wheel is configured to rotate in a direction different from a rotation direction of the first centering roller, and

wherein the second driven wheel is configured to rotate in a direction different from a rotation direction of the second centering roller.

2. The apparatus of claim 1 , wherein the first centering roller and the second centering roller are configured such that a plurality of first centering rollers and a plurality of second centering rollers are arranged in a direction vertical to the transfer direction of the bill.

3. The apparatus of claim 2 , wherein the first centering rollers and the second centering rollers are arranged to cause a difference in frictional forces applied to the one portion and the other portion of the bill when a center of the bill is weighted towards one side or the other side of the center line.

4. The apparatus of claim 2 , wherein the first centering rollers provided in plural number are arranged such that at least one portion of the first centering roller overlaps with an adjacent first centering rollers in the transfer direction of the bill, and the second centering rollers provided in plural number are arranged such that at least one portion of the second centering roller overlaps with an adjacent second centering roller in the transfer direction of the bill.

5. The apparatus of claim 1 , wherein an inclination angle (θ′) between the first driven wheel or the second driven wheel and the center line satisfies a complementary angle of an inclination angle (θ) between the first centering roller or the second centering roller and the center line C.

6. The apparatus of claim 1 , wherein the inclination angle (θ′) between the first driven wheel or the second driven wheel and the center line reduces gradually from an alignment entrance side of the transfer path to an alignment exit side.

7. An apparatus for aligning a bill supplied onto a transfer path with a center line of the transfer path, the apparatus comprising:

a first centering roller arranged on the transfer path to be inclined towards the center line and having a first driven wheel formed in a border part to face one edge line of the transfer path; and

a second centering roller arranged on the transfer path to be inclined towards the center line so as to be symmetric to the first centering roller and having a second driven wheel formed in a border part to face the other edge line of the transfer path,

wherein the first driven wheel is configured to rotate in a direction different from a rotation direction of the first centering roller, and

wherein the second driven wheel is configured to rotate in a direction different from a rotation direction of the second centering roller.

8. The apparatus of claim 7 , wherein the first centering roller comprises:

a first rotating shaft adopted to provide a rotational force for moving the bill from one side of the transfer path to the center line;

a first roller body having a central part in which the first rotating shaft is disposed, and a border part in which the first driven wheel is rotatably installed,

wherein the first driven wheel is adopted to correct a traveling direction of the bill when a force is applied to the bill by the second centering roller.

9. The apparatus of claim 7 , wherein the second centering roller comprises:

a second rotating shaft adopted to provide a rotational force for moving the bill from the other side of the transfer path to the center line;

a second roller body having a central part in which the second rotating shaft is disposed, and a border part in which the second driven wheel is rotatably installed,

wherein the second driven wheel is adopted to correct a traveling direction of the bill when a force is applied to the bill by the first centering roller.

10. The apparatus of claim 7 , further comprising:

a bill position sensor sensing a position of the bill being moved along the transfer path and providing position information of the bill; and

a controller controlling an operation of the first centering roller and an operation of the second centering roller according to the position information of the bill so that the bill is aligned with the center line of the transfer path.

11. The apparatus of claim 10 , wherein the bill position sensor comprises:

an entrance position sensor providing information about an alignment entrance of the transfer path at which alignment of the bill begins;

an exit position sensor providing information about an alignment exit of the transfer path at which alignment of the bill is completed; and

an alignment position sensor providing width position information of the bill aligned with the center line.