JPH0381893A - Device for recognizing paper sheet and the like - Google Patents

Abstract

PURPOSE:To stably segment read data by comparing a printing pattern read out by the other side sensor group out of plural paper sheet and the like discriminating sensor groups with a selected decision reference value to decide the read contents. CONSTITUTION:A right side decision reference value selecting means 5 reads out a decision reference value based upon the right end position of paper money M found out by a right end position detecting sensor group 3 and a decision reference value is selected in accordance with the right end position detecting sensor detecting the right end position of the paper money M out of plural right end position detecting sensors R1 to R10. A right side decision means 51 decides whether the integrated values of respective areas 1 to 3 are included within the selected range of an upper limit value and a lower limit value or not. Then an integrated decision part 12 synthesizes the decided results of the right decision means 51 and the left decision means 52 to decide the sort of paper money M.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper sheet recognition device incorporated into an automatic teller machine, an automatic teller machine, a currency exchange machine, and the like.

(Prior Art) Automatic teller machines, automatic teller machines, currency exchange machines, etc. used in financial institutions are equipped with paper sheet recognition devices for recognizing paper sheets, that is, banknotes. . Such a paper sheet recognition device detects the type, authenticity, dirt, damage, etc. of banknotes.

FIG. 2 is a block diagram showing the configuration of a conventional paper sheet recognition device.

The illustrated device includes a conveyance means 1, a paper sheet discrimination sensor group 2, a right edge position detection sensor group 3, and a left edge position detection sensor group 4.
, a longitudinal length detecting section 8, a read data cutting section 9, a determining means 10, and the like.

The conveyance means 1 includes a conveyance path 11 and a plurality of drive rollers 12a.
, 12b, etc.

The conveyance path 11 has a width slightly wider than the width of the banknote M in the longitudinal direction. Bills M are transported one by one along the transport path 11 in the lateral direction. A light source 13 is provided at a predetermined location on this conveyance path 11 .

Drive rollers 12a and 12b are provided on the left and right sides of the conveyance path 11, respectively. A plurality of these drive rollers 12a and 12b are provided in the middle of the conveyance path 11.

The light source 13 is a linear light source that irradiates the paper surface of the banknote M with light.

The paper sheet discrimination sensor group 2 includes a plurality of paper sheet discrimination sensors (for example, six
pieces) are arranged. The paper sheet discrimination sensor group 2 is provided on the front side and the back side (not shown) of the banknote M. The paper sheet discrimination sensor group 2 on the front side of the banknote M receives the reflected light from the light source 13 on the banknote M. Further, the paper sheet discrimination sensor group on the back side of the banknote M receives the light transmitted through the banknote M by the light source 13. These paper sheet discrimination sensor groups detect the print pattern of the banknote M and output it as the strength of an electric signal.

The read data storage unit 21 inputs the output of the paper sheet discrimination sensor group 2. This read data storage section 21 has a capacity that can store all the printing patterns on the banknote M.

In the read data storage unit 21, analog signals of each sensor S1 to S6 of the banknote discrimination sensor group 2 when a banknote passes are stored as A.
A /D converter is used to convert the data into digital data strings, and these digital data strings are temporarily stored.

The right end position detection sensor group 3 is for detecting the amount of displacement of the right end of the banknote M in the longitudinal direction. The right end position detection sensor group 3 is made up of sensors R1 to RIO that are composed of a plurality of (for example, 10) photo ink lenses arranged linearly in the longitudinal direction of the banknote M. That is, the right edge position detection sensor group 3 is composed of a pair of a light emitting element group and a light receiving element group provided on the front side and the back side of the banknote M, respectively. The output of the right end position detection sensor group 3 is input to the right end position detection section 31.

The left end position detection sensor group 4 is for detecting the left end position of the banknote M, and determining the longitudinal length of the banknote M from the difference between the left end position and the right end position detected by the right end position detection sensor group 3. Similarly to the right edge position detection sensor group 3, this left edge position detection sensor group 4 is also configured by sensors L1 to LIO, each of which is composed of a plurality of (for example, 10) photo ink lenses arranged linearly in the longitudinal direction of the banknote M. It is configured. The output of the left end position detection sensor group 4 is input to the left end position detection section 41 .

The right end position detection section 31 and the left end position detection section 41 determine whether the output of any one of the sensors R1 to RIO or L1 to LIO is larger or smaller than a reference output value. When the outputs of the sensors R1 to RIO or L1 to LIO are larger than the reference output value, it is determined that there is no banknote M in a certain part of the sensor. In addition, sensors R1 to R
When the output of IO or L1 to LIO is smaller than the reference output value, it is determined that the banknote M is present in a certain part of the sensor. Then, the right end position detection unit 31 detects the position of the rightmost sensor that has determined that the banknote M is present.
The right end position of the banknote M is determined, and this right end position data is output. On the other hand, the left end position detection unit 41 determines the position of the leftmost sensor that has determined that the banknote M is present as the left end position of the banknote M, and outputs this left end position data.

The outputs of the right end position detection section 31 and the left end position detection section 41 are as follows.
Both are input to the longitudinal length detection section 8.

Further, the outputs of the right end position detection section 31 and the read data storage section 21 are both input to the read data cutting section 9.

The longitudinal length detecting section 8 calculates the longitudinal length from the right end position data from the right end position detecting section 31 and the left end position data from the left end position detecting section 41.

The read data cutting unit 9 includes a cutting data table 9a that stores a plurality of data on predetermined banknote characteristic pattern positions (from how many millimeters to how many millimeters from the right end in the longitudinal direction). Read data extraction section 9
Based on this cutout data table 9a, only data at the required characteristic pattern position is cut out from the digital data string read by the banknote discrimination sensor group 2 stored in the read data storage section 21. The digital data strings of the characteristic pattern positions thus cut out are sequentially transferred to the determination means 10.

The determining means 10 compares the characteristic pattern sent from the read data cutting section 9 with the characteristic pattern determination reference value outputted from the determination reference value selection means 11 and outputs the comparison result to the comprehensive determining section 12.

The determination reference value selection means 11 selects a feature pattern determination reference value based on the right end position detection result of the right end position detector 31 from among the feature pattern determination reference values prepared in advance for each right end position data of the right end position detector 31. Select and output. As a result, when the banknote M is conveyed with a horizontal shift, the print pattern read by the paper sheet discrimination sensor group 2 will be different, and the characteristic pattern determination reference value will also be changed accordingly. In this way, even if the banknote M shifts laterally, the banknote M can be recognized.

The comprehensive determination unit 12 determines the denomination of the banknote M, based on the comparison result by the determination unit 10 and the longitudinal length data of the longitudinal length detection unit 8.
A final determination of authenticity, defacement, etc. is made.

Next, the processing of the right end position detection section 31 and the processing of the determination reference value selection means 11 will be explained with reference to FIG.

FIGS. 3(a), 3(b), and 3(C) are explanatory diagrams of conventional paper sheet recognition operations.

FIG. 3(a) is an example of a case where the banknote is conveyed at the standard position (lateral deviation amount O). At this time, the right end position detection section 31
In this case, it is determined by the sensors R4 to R10 that the banknote M is present, and the position data corresponding to the sensor R4 is output as the right end position data.

In the determination reference value selection means 11, characteristic pattern determination reference values are prepared for each right end position detection data (for each lateral shift amount) of the right end position detection section. For example, when there is no lateral shift, the area to be read by the sheet discrimination sensors S4 and S6 is the shaded area shown on the right side of FIG. Let's call it track q. Next, when the banknote shifts to the right or left and the rightmost sensors that determine that the banknote M is present are R3 and R5, the areas to be read by the paper sheet discrimination sensor S4 are set to S4, respectively. Track p+1.
This will be referred to as track p-i of S4. Similarly, for the paper sheet discrimination sensor S6, the track q+1 of S6 is also
, S6 will be referred to as track q-1. Similarly, if the banknote shifts to the right or left by m right edge position detection sensor groups, tracks p+m, pm, and
The track of S6 is called q+m%q-m.

In the example of FIG. 3(a), since there is no lateral shift, the sheet discrimination sensors S4 and S6 are 1, and the tracks p and 86 of S4 are
The characteristic pattern determination reference value corresponding to track q is selected, and the determination means compares the actually read print pattern in the shaded area on the left side of FIG. 3(a) with the selected characteristic pattern determination reference value. Compare and judge.

In the example of FIG. 3(b), the banknote shifts to the left, the right edge position detection unit determines that the sensors R8 to RIO are present, and the right edge position detection result indicates the position corresponding to sensor R8. Data is output. Therefore, since the sensor R4 is laterally shifted by four sensors to the left, the determination reference value selection means selects the paper sheet discrimination sensors S4 and S6 as s4.
The feature pattern determination reference values corresponding to track p-4 of 86 and track q-4 of 86 are selected. As a result, the printed pattern reading areas 84 and 86 on the left side of FIG. 4(b) (
The determination unit compares the area (shaded area) of track p-4 of S4 and track Q-4 of 86, which correspond to the characteristic pattern determination value on the right side of FIG. 4(b).

Next, let us consider a case where a banknote with a crease as shown in FIG. 4(C) is conveyed.

Similarly to the figure (b), in the right end position detection section 31, the sensor R8
is the sensor in which the rightmost banknote is present, and the determination reference value selection means 11 determines that the paper sheet discrimination sensors S4 and S6 are the sensor in which the rightmost banknote is present. The feature pattern determination reference value corresponding to is selected.

On the other hand, the printed pattern reading areas of the paper sheet discrimination sensors S4 and S6 are the areas indicated by the hatched area on the left side of FIG. 4(C).

(Problems to be Solved by the Invention) However, the above-described device has the following problems.

That is, in the case of FIG. 3(C), since the banknote M is not completely stretched in the longitudinal direction at the folded part, as can be seen by comparing it with FIG. 3(b), the paper sheet Discrimination sensor S
The area of the print pattern read in steps 4 and S6 ends up being shifted from its original position.

In addition to the folding of banknotes, similar track deviations also occur when the banknotes get wet with water and then dry, which causes the banknotes to shrink. In this way, the paper sheet recognition device
Since banknotes that are passed through human hands are to be handled, it is also necessary to recognize folded or shrunken banknotes. For this reason, there is a problem with such banknotes that the jet rate increases during recognition.

On the other hand, conventionally, in order to reduce the amount of bill pasting, there is a method of lenient judgment values during recognition, but this method has the problem of increasing the risk of erroneous recognition.

The present invention has been made with attention to the above points, and an object of the present invention is to provide a paper sheet recognition device that can prevent an increase in the rejection rate without lenient judgment values when recognizing banknotes. That is.

(Means for Solving the Problems) A paper sheet recognition device of the present invention includes a conveyance means for conveying paper sheets, and a paper sheet arranged in a direction perpendicular to the conveyance direction and for reading a printed pattern on the paper sheets. A leaf discrimination sensor group, a one end position detection sensor group that detects the position of one end of the paper sheet, an other end position detection sensor group that detects the other end position of the paper leaf, and the paper leaf discrimination sensor group one end side determination reference value selection means for selecting a determination reference value for the sensor group on one side based on the one end position detection result of the one end position detection sensor group; the other end side determination reference value selection means for selecting the determination reference value for the sensor group on the other side based on the other end position detection result of the other end position detection sensor group; and the paper sheet discrimination sensor One end side determination means for making a determination by comparing the printed pattern read by the sensor group on the negative side of the group with the determination reference value selected by the one end side determination reference value selection means;
The other end side, which is determined by comparing the print pattern read by the sensor group on the other side of the sheet discrimination sensor group with the determination reference value selected by the other end determination reference value selection means. The present invention is characterized by comprising a determination means.

(Operation) In the above-described apparatus, first, the print pattern on the paper sheet is read by the paper sheet discrimination sensor group. Then, based on the one end position detected by the one end position detection means, the one end determination reference value selection means selects the determination reference value for the one end side of the paper sheet. On the other hand, based on the other end position detected by the other end position detection means, the other end determination reference value selection means selects the determination reference value for the other end of the paper sheet. Therefore, the distance from the position reference when selecting the determination reference value to the predetermined position on the paper sheet does not become long. Therefore, as shown in Fig. 6(c), even if the paper sheet has wrinkles, etc., the judgment standard values for recognizing the printed pattern on the paper sheet are as shown in Fig. 3(C). It can be obtained more accurately than in the conventional case. As a result, it is possible to prevent an increase in the rejection rate due to the inability to recognize paper sheets without making the determination reference value too strict.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the paper sheet recognition device of the present invention.

The illustrated device includes a conveyance means 1, a paper sheet discrimination sensor group 2, a right edge position detection sensor group 3, and a left edge position detection sensor group 4.
, the judgment reference value selection means 5 on the right side, the judgment reference value selection means 6 on the left side, the longitudinal length detection section 8, and the judgment means 5 on the right side.
1, a determination means 52 on the left side, and the like.

The conveyance means l includes a conveyance path 11 and a plurality of drive rollers 12a.
, 12b, etc. Since the details of each part are the same as those of the conventional device shown in FIG. 2 described above, repeated explanations will be omitted.

As in the conventional case, a plurality (for example, six) of paper sheet discrimination sensor groups 2 are arranged linearly in the longitudinal direction of the banknote M, that is, in the direction orthogonal to the transport direction of the banknote. The paper sheet discrimination sensor group 2 is provided on the front side and the back side (not shown) of the banknote M. The paper sheet discrimination sensor group 2 on the front side of the banknote M is
The light reflected from the light source 13 on the banknote M is received. Further, the paper sheet discrimination sensor group on the back side of the banknote M receives the light transmitted through the banknote M by the light source 13. These paper sheet discrimination sensor groups detect the print pattern of the banknote M and output it as the strength of an electric signal.

The right end position detection sensor group 3 is for detecting the amount of deviation of the right end of the banknote M in the longitudinal direction. The right end position detection sensor group 3 is constituted by a sensor R1-RIO consisting of a plurality (for example, 10) of photointerrupters arranged linearly in the longitudinal direction of the banknote M. That is, the right edge position detection sensor group 3 is composed of a pair of a light emitting element group and a light receiving element group provided on the front side and the back side of the banknote M, respectively. The output of the right end position detection sensor group 3 is input to the right end position detection section 31.

The left end position detection sensor group 4 is for detecting the amount of deviation of the left end of the banknote M in the longitudinal direction. Similarly to the right edge position detection sensor group 3, this left edge position detection sensor group 4 also has a plurality (for example, 10
Sensors L1 to L10 consisting of photo ink ladle
It is made up of. The output of the left end position detection sensor group 4 is input to the left end position detection section 41 .

The right end position detection section 31 and the left end position detection section 41 determine whether the output of any one of the sensors R1 to R10 or L1 to LIO is larger or smaller than a reference output value. When the outputs of the sensors R1 to RIO or L1 to LIO are larger than the reference output value, it is determined that there is no banknote M in a certain part of the sensor. In addition, sensors R1 to R
When the output of IO or L1 to LIO is smaller than the reference output value, it is determined that the banknote M is present in a certain part of the sensor. Then, the right end position detection unit 31 detects the position of the rightmost sensor that has determined that the banknote M is present.
The right end position of the banknote M is determined, and this right end position data is output. On the other hand, the left end position detection unit 41 determines the position of the leftmost sensor that has determined that the banknote M is present as the left end position of the banknote M, and outputs this left end position data.

The output of the right end position detection section 31 is input to the judgment reference value selection means 5 on the right side. Further, the output of the left end position detection section 41 is inputted to the left side determination reference value selection means 6.

The right-side determination reference value selection means 5 selects the right-end position detection section 3 in advance.
Based on the right end position detection result of the right end position detection section 31, a feature pattern determination reference value is selected and output from among the feature pattern determination reference values prepared for each right end position data.

The left side determination reference value selection means 6 is configured to select the left end position detection section 4 in advance.
Based on the left end position detection result of the left end position detection section 41, a feature pattern determination reference value is selected and output from among the feature pattern determination reference values prepared for each left end position data.

On the other hand, the banknote M read by the paper sheet discrimination sensor group 2
The upper print pattern is input to and stored in the read data storage section 22 on the right side and the read data storage section 23 on the left side.

Further, the output of the read data storage section 22 on the right side is input to the read data cutting section 24 on the right side. The output of the read data storage section 23 on the left side is input to the read data cutting section 25 on the left side.

The read data cutting unit 24 on the right side reads a cutting data table 24a on the right side that stores a plurality of data on predetermined characteristic pattern positions of banknotes (from how many millimeters to how many millimeters from the right end in the longitudinal direction). We are prepared. The read data cutout section 24 extracts the data at the required characteristic pattern position from the digital data string read by the sheet discrimination sensor group 2 stored in the read data storage section 22 based on the cutout data table 24a on the right side. Cut out only. The digital data strings of the characteristic pattern positions thus cut out are sequentially transferred to the determining means 51 on the right side.

The left side read data cutting unit 25 reads a left side cutting data table 25a that stores a plurality of data of predetermined characteristic pattern positions of banknotes (from how many millimeters to how many millimeters from the left end in the longitudinal direction). We are prepared. The left read data cutting unit 25 selects a required characteristic pattern position from the digital data string read by the paper sheet discrimination sensor group 2 stored in the read data storage unit 23 based on the left side cutting data table 25a. Cut out only what is there. The digital data strings of the characteristic pattern positions thus cut out are sequentially transferred to the determination means 52 on the left side.

Further, the outputs of the right end position detection section 31 and the left end position detection section 41 are both input to the longitudinal length detection section 8.

The longitudinal length detecting section 8 calculates the longitudinal length from the right end position data from the right end position detecting section 31 and the left end position data from the left end position detecting section 41.

The determining means 51 performs various feature extraction processes from the received read data string corresponding to each feature pattern position.

Then, the extracted features are compared with the feature pattern determination reference value selected by the determination reference value selection means 5 on the right side.

The determining means 52 performs various feature extraction processes from the received read data string corresponding to each feature pattern position.

Then, the extracted features are compared with the feature pattern judgment reference value selected by the judgment reference value selection means 6 on the left side.

The comprehensive judgment unit 12 makes a final judgment on the denomination, authenticity, defacement, etc. of the banknote M based on the comparison results of the judgment means 51 and 52 and the longitudinal length data.

Note that if the separation of paper sheet discrimination sensor group 2 is performed at a position close to the longitudinal center of the banknotes that have been transported without lateral deviation, detection errors due to bending or shrinkage of banknotes can be minimized. be able to. However, it is not always necessary to completely divide the right side and left side of the paper sheet discrimination sensor group 2 into two, and for convenience of distinguishing the printing pattern of banknotes, the paper sheet discrimination sensor group 2 is The discrimination sensor group may be cut out to the right or left side for discrimination.

Next, the operation of the above-described device will be explained.

FIG. 4 is a graph showing an example of a data string read by the sheet discrimination sensor.

Each paper sheet discrimination sensor S forming the paper sheet discrimination sensor group 2
1 to S6 read the print pattern at each predetermined location on the banknote M. As shown in FIG. 4, for example, the sensor S1 reads a print pattern in the transverse direction at a certain position of the sensor S1. That is, the horizontal axis in FIG. 4 represents the position of the banknote M in the lateral direction by number. Further, the vertical axis in FIG. 4 indicates A/D converted data values corresponding to the numbers on the horizontal axis.

FIG. 5 is a flowchart showing the processing procedure for the read data string of FIG.

The data string read by sensor S1 is processed according to the flowchart shown in FIG. First, the read data cutting unit 24 cuts out data strings from areas 1 to 3 in the transverse direction read by the sensor S1 shown in FIG. 4 (step Sl). Then, an integral value is determined for each data string of areas 1 to 3 (step S2). This integral value is
This value represents the characteristics of the print pattern.

Next, the right-side determination reference value selection means 5 reads the determination reference value based on the right end position of the banknote M determined by the right end position detection sensor group 3 (step S3). This criterion value consists of an upper limit value and a lower limit value of the integral value to be obtained in step S2. Ten upper limit values and lower limit values are prepared for the sensor S1 corresponding to the right end position detection sensors R1 to RIO. The right-side determination reference value selection means 5 selects a determination reference value depending on whether any of the right-end position detection sensors R1 to RIO has detected the right-end position. Similarly, ten sensors S2 to S6 are prepared corresponding to the right end position detection sensor or the left end position detection sensor.

Next, the determining means 51 on the right side determines whether the integral value of each area 1 to 3 is within the range of the upper limit value and lower limit value selected in step S3 (step S4).

The above processing is similarly performed for the sensors S2 to S6. However, for the sensors S1 to S4, the determination reference values are selected based on the right end position, and for the sensors S3 to S6, the determination reference values are selected based on the left end position.

Thereafter, the comprehensive determination section 12 integrates the determination results of the right-side determination means 51 and the left-side determination means 52, and determines the denomination, etc. of the banknote M.

Next, the determination reference value selection means 5.6 in the above-mentioned device
The process will be explained in detail with reference to FIG.

FIGS. 6(a), (b), and (c) are explanatory diagrams of paper sheet recognition operations according to the present invention. The left side of FIGS. 6(a), (b), and (C) shows three types of bill running states, and the right side shows the process of selecting the determination reference value by the determination reference value selection means.

FIG. 6 is an example of a case where banknotes are conveyed in a standard position (no lateral deviation). At this time, the right end position detection section 31
Sensors R4 to RIO determine that a banknote is present, and position data corresponding to sensor R4 is output as a right end position detection result.

On the other hand, the left end position detection unit 41 determines that the sensors L1 to L5 are in a state where a banknote is present, and outputs position data corresponding to the sensor L5 as a left end position detection result.

In FIG. 6(a), left banknote discrimination sensors S4 and S
6, the left-side determination reference value selection means 6 learns that there is no lateral shift from the left end position detection result, and selects S4.
The feature pattern determination reference values corresponding to track p of S6 and track q of S6 are selected and output. Judgment means 5 on the left side
In step 2, the printed patterns 84 and 86 in the shaded area on the left side of FIG. 6(a) are compared with the characteristic pattern determination reference value in the shaded area on the right side of FIG. 6(a). .

In the example of FIG. 6(b), the banknote is laterally shifted to the left, and the left end position detection unit determines that the sensors L1 to L9 are in a state where the banknote exists, and the left end position detection result is the sensor L9.
The position data corresponding to is output. Therefore, sensor L
5, there is a horizontal shift of four sensors to the left, so the left-side determination reference value selection means selects track p-4 of S4 and track q- of S6 for sheet discrimination sensors S4 and S6.
The feature pattern determination reference value corresponding to 4 is selected. As a result, for the printed pattern reading area 84 and S6 on the left side of FIG. 6(b) (shaded area), the track p of S4 corresponding to the characteristic pattern determination reference value on the right side of FIG. 6(b)
-4 and the area (shaded area) of track q-4 of S6 are compared by the determination means 52 on the left side.

In the example of FIG. 6(C), a case is shown in which a banknote with a crease is conveyed. As in the case of FIG. 6(b), the right end position of the banknote is in a state where the banknote exists up to the right end position detection sensor R8, but the left end position of the banknote is completely folded in the long plane direction. Since the banknotes are not fully extended, the banknotes are present up to the left end position detection sensor L7. Therefore, in the left-side determination reference value selection means 6, the left end position is shifted two sensors 9 to the left from the standard left end position of the sensor L5.

For this reason, the paper sheet discrimination sensors S4 and S6 are
The feature pattern determination reference values corresponding to track p-2 of S4 and track q-4 of S6 are selected. As a result, the reading areas of the paper sheet discrimination sensors S4 and S6 shown by the hatched area on the left side of FIG. 6(C), and the determination reference value selection means 6 shown by the shaded area on the right side of FIG. The deviation from the area showing the selection result in is smaller than in the case shown in FIG. 3(C). Therefore, banknotes can be recognized accurately.

The invention is not limited to the embodiments described above.

That is, in the above-described embodiment, a case has been described in which the banknotes M are conveyed in the transverse direction, but the present invention is not limited to this, and may be conveyed in the longitudinal direction.

Further, in FIG. 1, a case has been described in which data is cut out in the lateral direction of the banknote M, but data may be cut out in the long direction. In this case, when the banknote M is transported by the transport means 1, the paper sheet discrimination sensor group 2 detects the upper and lower end positions of the banknote M. Then, for the upper side of the banknote M, the read data is extracted based on the upper end position of the banknote M, and for the lower side of the banknote M, the read data is cut out based on the upper end position of the banknote M.
The read data is cut out based on the lower end position of .

Further, in the above-described embodiments, a device for recognizing banknotes has been described, but it is of course possible to recognize other paper sheets such as securities, bonds, or similar securities.

(Effects of the Invention) As explained above, in the paper sheet recognition device of the present invention, the print pattern on the right side and left side or the upper and lower ends of the sheet is judged based on the position of the one end. Since the print pattern on the other end side with respect to the one end is selected based on the position of the other end, the following effects can be obtained.

In other words, the lateral deviation of the judgment reference value can be corrected independently for one end of the paper sheet and the other end, and even if the paper sheet is shrunk or has folds, positional deviation can be corrected. This makes it possible to cut out read data stably and without difficulty. Therefore, paper sheets can be accurately identified with a low rejection rate.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the paper sheet recognition device of the present invention, Fig. 2 is a block diagram showing a conventional paper sheet recognition device, and Fig. 3 (a), (b), and (C). is an explanatory diagram of a conventional paper sheet recognition operation, FIG. 4 is a graph showing an example of a read data string by a paper sheet discrimination sensor, FIG. Figure 6 (a), (
b) and (C) are explanatory diagrams of the paper sheet recognition operation of the present invention. DESCRIPTION OF SYMBOLS 1... Conveyance means, 2... Paper sheet discrimination sensor group, 3.
...Right end position detection sensor group, 4.Left end position detection sensor group, 5.Right side judgment/reference value selection means, 6.Left side judgment reference value selection means, 8.Longitudinal length. Detection unit, 22.23...Read data storage unit, 31...Right end position detection unit, 41...Left end position detection unit, 51...Right side determination means, 52...Left side determination means.

Claims (1)

[Scope of Claims] A conveyance means for conveying paper sheets; a group of paper sheet discrimination sensors that are arranged in a direction perpendicular to the conveyance direction and read the print pattern on the paper sheets; and one end of the paper sheets. Judgment for the sensor group on one side of the one end position detection sensor group that detects the position, the other end position detection sensor group that detects the other end position of the paper sheet, and the paper sheet discrimination sensor group one end side determination reference value selection means for selecting a reference value based on the one end position detection result of the one end position detection sensor group; and a determination criterion for the sensor group on the other side of the paper sheet discrimination sensor group. another end side determination reference value selection means for selecting a value based on the other end position detection result of the other end position detection sensor group; and a sensor group on one side of the paper sheet discrimination sensor group. one edge side determination means for comparing and determining the read print pattern with the determination reference value selected by the one edge side determination reference value selection means; and the paper sheet discrimination sensor group,
It is characterized by comprising other end side determination means for making a determination by comparing the printed pattern read by the sensor group on the other side with the determination reference value selected by the other end determination reference value selection means. paper sheet recognition device.