Paper medium recognition device and method for aligning said paper medium
A paper medium recognition device according to one embodiment of the present invention includes: a main body that provides a transportation path in which an alignment reference line for aligning a paper medium is arranged on one side; and an alignment unit which has a transportation roller which transports the paper medium in the longitudinal direction along the transportation path, and which has an alignment roller that is arranged in the direction orthogonal to the transportation roller so as to transport the paper medium in the width direction toward the alignment reference line. A phase difference is provided during the rotation of the transportation roller and the alignment roller, and thus the paper medium can be alternately transported in the longitudinal direction and width direction.
1. A paper media recognition device, comprising:
a main body; and
an alignment unit in the main body and configured to align a paper medium with a reference alignment surface, the paper medium being transferred along a transfer path in the main body, the alignment unit comprising:
a transfer roller configured to transfer the paper medium along the transfer path; and
an alignment roller configured to transfer the paper medium in a direction traversing the transfer path and toward the reference alignment surface, and
wherein the transfer roller and the alignment roller have a phase difference such that a distance that the paper medium is transferred by the alignment roller is longer than a distance that the paper medium is transferred by the transfer roller and
wherein the transfer roller has a first non-circular shape having first symmetrical opposite ends to contact the paper medium as the transfer roller is rotated, and the alignment roller has a second non-circular shape having second symmetrical opposite ends to contact the paper medium as the alignment roller is rotated, and wherein a length of the first symmetrical opposite ends along which the transfer roller contacts the paper medium is shorter than a length of the second symmetrical opposite ends along which the alignment roller contacts the paper medium.
2. The device of claim 1 , wherein
the alignment roller has a phase difference of an acute angle range with respect to the transfer roller.
3. The device of claim 2 , wherein the phase difference between the transfer roller and the alignment roller ranges from 30° to 60°.
4. The device of claim 1 , wherein the alignment roller contacts the paper medium after the transfer roller disengages from the paper medium.
5. The device of claim 1 , further comprising a first shaft on which the transfer roller is installed, a second shaft extending parallel to the first shaft, and another transfer roller installed on the second shaft transfer roller,
wherein the alignment roller is installed between the first and second shafts and on a third shaft oriented perpendicular to the first and second shafts.
6. The device of claim 5 , further comprising a bevel gear unit connecting the third shaft with the second shaft, and
an alignment drive motor connected to the first axis and the second axis to rotate the first axis and the second axis.
7. The device of claim 6 , wherein the bevel gear unit comprises: a first gear provided on either of the first shaft or the second shaft; and a second gear provided on the third shaft,
wherein a ratio between a number of teeth of the first gear and a number of teeth of the second gear is 1:1.
8. A method for aligning a paper medium of paper media recognition device, the device comprising: a main body; and an alignment unit in the main body and configured to align the paper medium with a reference alignment surface, the paper medium being transferred along a transfer path in the main body, the alignment unit configured to transfer the paper medium in a direction traversing the transfer path and toward the reference alignment surface, wherein the alignment roller has a phase difference with respect to the transfer roller such that a distance that the paper medium is transferred by the alignment roller is longer than a distance that the paper medium is transferred by the transfer roller,
the paper medium alignment method comprising:
driving the alignment unit when an approach detecting sensor provided in a front end of the alignment unit and disposed on the transfer path senses approach of the paper medium;
aligning the paper medium with the reference alignment surface by means of interlocking the transfer roller and the alignment roller with each other;
sensing whether the paper medium is aligned with the reference alignment surface using a plurality of alignment sensors; and
interrupting the operation of the alignment unit when completion of the alignment of the paper medium is sensed,
wherein in the alignment operation, after the transfer roller is rotated by the phase difference while the paper medium is in contact with the transfer roller, the alignment roller holds the paper medium, and
wherein the transfer roller has a first non-circular shape having first symmetrical opposite ends to contact the paper medium as the transfer roller is rotated, and the alignment roller has a second non-circular shape having second symmetrical opposite ends to contact the paper medium as the alignment roller is rotated, and wherein a length of the first symmetrical opposite ends along which the transfer roller contacts the paper medium is shorter than a length of the second symmetrical opposite ends along which the alignment roller contacts the paper medium.
9. The method for aligning paper medium of claim 8 , wherein
the alignment roller is oriented such that the alignment roller has a phase difference of an acute angle range with respect to the transfer roller.