JPH06215224A - Paper sheet reader and its signal processing method - Google Patents

Abstract

PURPOSE:To make it possible to start the reading of a pattern from a reading means until a paper sheet reaches the reading means always when rotation on the surface of the paper sheet is included within a judging processing enabled range in a paper sheet reader for reading out the pattern of a paper sheet by a one-dimensional reading means. CONSTITUTION:The setting positions of a one-dimensional reading means 3 for reading out the pattern of a carried paper sheet 2 and detecting means 4, 5 arranged on the upstream side of the means 3 in the carrying direction to detect the arrival of the sheet 2 are determined by using the absolute value thetamax of the maximum value of rotational angles of the sheet 2 to judge the sheet 2 and a control means 6 monitors output signals 41, 51 from the means 4, 5 and an output signal 31 from the means 3 and outputs a trigger signal 61 for starting the reading of a pattern from the means 3 to an A/D converter 7. Thereby the pattern reading from the means 3 can be surely started until the sheet 2 reaches the means 3 always when rotational amount within the surface of the sheet 2 is included within the judging processing enabled range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet reader for reading a pattern of a sheet conveyed on a conveying path in a width direction of the conveying path by a one-dimensional reading means, and more particularly to a sheet being conveyed. If the rotation of the paper sheet in the plane is within the range that can be discriminated, the paper sheet reading device and the signal thereof can always start reading the pattern by the reading means before the paper sheet reaches the reading means. Regarding processing method.

[0002]

2. Description of the Related Art In a discriminating apparatus for discriminating paper sheets such as banknotes and securities conveyed on a conveyance path, a pattern of conveyed paper sheets is read by a one-dimensional image sensor in the width direction of the conveyance path and two-dimensionally read. Image is generated and the two-dimensional image is processed to discriminate the paper sheet. Generally, when a paper sheet is conveyed in a direction parallel to the surface of the paper sheet, the paper sheet undergoes rotation in the plane (rotation about the normal line to the surface of the paper sheet) during the conveyance. The angle of the edge of the paper sheet with respect to the transport path center line changes, and the shape of the read pattern also becomes a rotated shape. A conventional paper sheet reader used for this purpose is composed of a one-dimensional image sensor and two detecting means as in the apparatus disclosed in Japanese Patent Laid-Open No. 4-180193, and the two detecting means are paper sheets. The rotation angle of the paper sheet is calculated from the time difference for detecting, and when the arrival of the paper sheet is detected by the two detecting means, the output signal of the image sensor is A / D converted to read the pattern of the paper sheet. After the start, the discriminating means corrects the pattern of the paper sheet read by the reading means based on the calculated rotation angle of the paper sheet to discriminate the paper sheet.

[0003]

In a general paper sheet conveying apparatus, the posture of the paper sheet to be conveyed changes depending on the state of the paper sheet and the like, and the paper sheet is conveyed during the conveyance. Rotation occurs about the normal line standing on the surface of. The rotation angle at which normal paper sheet discrimination processing is possible is determined by the device, and the discrimination device detects the rotation angle of the conveyed paper sheets, and if the rotation angle is within the discriminable range, the discrimination processing is performed. If it exceeds the discriminable range, the discrimination process is not performed. As a method for detecting the rotation angle of the conveyed paper sheet, a method of calculating the rotation angle from the difference between the arrival times of the two edges of the paper sheet by using two detection means or a reading means is used. There is a method of calculating the rotation angle by a mathematical method after differentiating the two-dimensional image to obtain the edge of the image. The pattern of the paper sheet read by the reading means is processed and determined based on the rotation angle obtained by these methods. In order to reliably perform this series of processing, it is necessary to read the pattern in a sufficient area where the discrimination processing is possible, and for that purpose, it is necessary to accurately generate the trigger signal for starting the reading of the pattern from the reading means. .

However, in the above-mentioned conventional technique, the arrival of the paper sheet for calculating the rotation angle of the paper sheet is detected, and the paper sheet for generating the trigger signal for starting the reading of the pattern from the reading means is detected. Since only two detecting means are used for detection, the arrival of the paper sheet may be detected by the two detecting means depending on the positional relationship between the two detecting means and the reading means and the rotation angle of the paper sheet. There is a problem that the paper sheet reaches the reading unit before the rotation angle is calculated, and the accurate pattern of the paper sheet cannot be processed. Further, there is also a problem that unnecessary data is always read when the absolute value of the rotation angle of the paper sheet is large and the discrimination processing cannot be performed.

An object of the present invention is to ensure that the paper sheet is always conveyed if the in-plane rotation angle formed by the straight line side of the conveyed paper sheet in the conveying direction and the center line of the reading means is within the range in which discrimination processing can be performed. The pattern can be read by the time when the pattern reaches the reading means to read the pattern in a sufficient area where the sheet can be discriminated and the sheet whose angle exceeds the discriminable range It is an object of the present invention to provide a paper sheet reader and a signal processing method therefor capable of canceling the reading of the pattern by the time the paper sheet reaches the reading means.

[0006]

In order to achieve the above-mentioned object, the present invention provides a detecting means on each side of the center line of the conveying path.
When used individually, the width of the conveying path is H, the length of the straight line side in the traveling direction of the paper sheet is W, and the straight line side capable of discriminating the paper sheet is the center line of the reading means. When the maximum absolute value of the in-plane rotation angle to be formed is θmax, the installation distance Y of the detection means from the end on the far side in the width direction of the transport path is Y ≦ W · cos θmax, and the absolute value of the angle is set. Is θmax, the installation distance X between the detecting means and the reading means on the side opposite to the side where the leading edge of the paper sheet first reaches the reading means is set to the reading means. The one-dimensional reading sensor of the reading means is arranged at a position where X = (W · cos θmax + Y−H) tan θmax based on the reached position.

According to the present invention, when one detecting means is used, the width of the conveying path is H, the length of the straight side directed in the traveling direction of the paper sheet is W, and the paper sheet is discriminated. The maximum value of the absolute value of the in-plane rotation angle formed by the straight line with the center line of the reading means is θmax, and the tip of the paper sheet whose absolute value is θmax reaches the reading means first. When the installation distance of the detection means from the end of the conveyance path on the side opposite to the side in the width direction is Y, the installation distance X of the detection means and the reading means in the conveyance direction.
Is based on the position where the leading edge of the paper sheet first reaches the reading means, and a one-dimensional reading sensor of the reading means is arranged at a position where X = (W · cos θmax−Y) tan θmax.

In the present invention, one detecting means is provided on each side of the center line of the conveying path, the width of the conveying path is H, the length of a straight side in the traveling direction of the paper sheet is W, and the paper sheet is When the maximum absolute value of the in-plane rotation angle formed by the straight line that is the center of the reading means is θmax, the installation distance of the detection means from the end on the far side in the width direction of the conveyance path can be determined. Y is set to Y ≦ W · cos θmax, and the conveyance direction of the detection unit and the reading unit on the side opposite to the side where the leading edge of the sheet whose absolute value of the angle is θmax reaches the reading unit first. When the installation distance X is set to a position where X = (W · cos θmax + Y−H) tan θmax with reference to the position where the leading edge of the paper sheet first reaches the reading unit, when the one-dimensional reading sensor of the reading unit is arranged, The control means monitors the output signals of the two detecting means and the reading means and In the case where the reading means starts reading the pattern of the paper sheet before or simultaneously with the two detecting means before the picking means, and the paper sheet reaches the reading means before the at least one detecting means. Is for processing the signal so that the reading means does not read the pattern of the paper sheet.

The present invention is also capable of discriminating a sheet by using one detecting means, the width of the conveying path is H, the length of a straight side directed in the traveling direction of the sheet is W, and the sheet is discriminated. The maximum absolute value of the in-plane rotation angle formed by the straight line with the center line of the reading means is θmax, and the side where the leading edge of the paper sheet whose absolute value of the angle is θmax reaches the reading means first is When the installation distance of the detection means from the widthwise end of the opposite transport path is Y,
The installation distance X between the detecting means and the reading means in the transport direction is set to X = (W · cos θmax−Y) tan θmax with reference to the position where the leading edge of the paper sheet first reaches the reading means. When the reading sensor is arranged, the control unit monitors the output signal of the detection unit and the output signal of the reading unit, and when the sheet arrives at the detection unit before or at the same time as the reading unit, the sheet by the reading unit is detected. When the reading of the pattern of the paper sheet is started and the paper sheet reaches the reading means before the detecting means, the signal is processed so that the reading means does not read the pattern of the paper sheet.

According to the present invention, the paper sheet is also a reading means or 2
The signal is processed so as to start reading the pattern of the paper sheet from the reading means at the time when either one of the detecting means or one detecting means is first reached.

[0011]

When the detecting means and the reading means are arranged with respect to the conveying path as described above, the straight side directed in the traveling direction of the conveyed paper sheet is the first detecting means. When passing through and then reaching the reading means and the remaining one detection means at the same time, in this state, the angle formed by the straight line side of the paper sheet and the center line of the reading means is the maximum angle .theta.max which is just discriminable. The pattern reading is performed. When the straight side of the paper sheet in the traveling direction reaches the reading means after passing through the two detecting means, the angle formed by the straight side of the paper sheet and the center line of the reading means is determined. The state is smaller than the maximum possible angle θmax, and in this case, the pattern is naturally read.

Further, when the straight side of the conveyed paper sheet in the traveling direction reaches the reading means before any one of the detecting means, the straight side of the paper sheet is read by the reading means. Since the angle formed with the center line of is larger than the maximum discriminable angle θmax and the pattern cannot be discriminated even if it is read, the reading is not performed.

In the paper sheet reading apparatus of the present invention, the angle formed by the straight line side of the conveyed paper sheet with the center line of the reading means is
If the pattern of the paper sheet is within a range in which the pattern of the paper sheet can be discriminated, the discriminated paper sheet pattern always reaches the detecting means before reaching the reading means. Even when the straight side reaches the reading means and the detecting means at the same time, the pattern of the paper sheet to be discriminated starts at least about 1 mm from the inside of the straight side, so that when the straight side reaches the reading means. Even if the reading unit is instructed to start reading, the reading unit can sufficiently start reading by the time the pattern reaches the reading unit. Therefore, the control means can start the reading of the pattern by the reading means before the paper sheet reaches the reading means, and the conveyed paper sheet if the paper sheet reaches the reading means before the detection means. Since it can be detected that the rotation of the class exceeds the rotation angle at which the determination processing can be performed, the control unit can prevent the reading of the pattern of the sheet from the reading unit without performing the calculation.

[0014]

EXAMPLES The present invention will be described below with reference to examples.

FIG. 1 shows the construction of a paper sheet reader according to an embodiment of the present invention. The paper sheet reader shown in FIG.
A one-dimensional reading means 3 which is installed on the transport path 1 for transporting the sheet 2 and reads the pattern of the paper sheet 2 in the width direction of the transport path 1, and a paper which is installed upstream of the reading means 3 on the transport path 1 in the transport direction. Detecting means 4 and 5 for detecting arrival of leaves 2 and detecting means 4 and
Control means 6 connected to the output side of 5 and the output side of the reading means 3 for receiving the output signals of the detecting means 4, 5 and the reading means 3.
And an A / D converter 7 connected to the output side of the control means 6 and the reading means 3, a storage means 8 connected to the output side of the A / D converter 7, and a storage means 8. The calculation means 9 is included. Each of the detecting means 4 and 5 is composed of a combination of a light emitting element and a light receiving element, and the light receiving element receives the spot light projected from the light emitting element and outputs an output signal having a value corresponding to the amount of received light. In the present embodiment, the output signal of the detecting means becomes an output signal of a value which means that the sheet 2 arrives when the actual light receiving area becomes half of the element light receiving area.

The positional relationship between the reading means 3 and the detecting means 4 and 5 is shown in FIG. The detecting means 4 and the detecting means 5 are located symmetrically with respect to the center line extending in the conveying direction of the conveying path 1, and the installation distances of the detecting means 4 and the detecting means 5 from the far end in the width direction of the conveying path 1. Y is the width of the conveying path 1 is H, the length of the paper sheet 2 in the width direction of the conveying path is W, and the absolute value of the maximum value of the rotation angle of the paper sheet 2 capable of discriminating the paper sheet 2 Θmax
Is set to a value satisfying the relationship of Y ≦ W · cos θmax (Equation 1). The absolute value of the rotation angle is θmax (rotating up to θmax as shown)
The detecting means 4 and the reading means 3 on the opposite side to the side where the leading edge of the paper sheet 2 reaches the reading means 3 first when viewed from the center line of the transport path.
The installation distance X in the conveyance direction is set to X = (W · cos θmax + Y−H) tan θmax (Equation 2) with reference to the position where the leading edge of the paper sheet 2 first reaches the reading unit 3. Since the detecting means 4 and 5 are installed symmetrically with respect to the center line of the transport path, the same applies to the detecting means 5.

Next, the operation of the apparatus having the above structure will be described. The paper sheet 2 is conveyed in the direction of the arrow on the conveying path 1 with the straight side facing the downstream direction of conveyance. Ideally, this straight side is preferably conveyed in a state of being parallel to the center line of the reading means. The reading unit 3 scans the sensor over the entire width of the conveyance path 1 to read the pattern (the pattern of the conveyance path when the sheet has not arrived) and outputs the output signal 31. The detecting means 4 and 5 start the arrival detection of the paper sheet 2 and output the output signals 41 and 51, respectively. The control means 6 monitors the input output signal 31 of the reading means 3 and the output signals 41, 51 of the detection means 4, 5 and inputs the output signal 31 of the paper sheet 2 in a state in which the output signal 31 indicates the pattern of the conveyance path. When the output signals 41 and 51 having a value indicating arrival are input, a trigger signal 61 for starting A / D conversion of the output signal 31 of the reading means 3 is output. At this time, the detecting means 4 and 5 may output an output signal indicating arrival of the paper sheet 2 when the amount of received light reaches a preset value.

The reading means 3 starts reading the pattern (the pattern of the conveying path when the sheet has not arrived) at the same time when the sheet 2 starts to be conveyed, and starts outputting the signal 31.
However, the A / D converter 7 does not perform A / D conversion of the signal 31 until the trigger signal is input from the control means 6.
The A / D converter 7 for A / D converting the output signal 31 of the reading means 3 starts A / D conversion of the output signal 31 of the reading means 3 when the trigger signal 61 is input from the control means 6, and A / D conversion is performed. /
The D-converted digital signal 71 is output. Storage means 8
When the digital signal 71 which is the one-dimensional pattern data of the paper sheet 2 is input from the A / D converter 7, the two-dimensional image data is created from the input one-dimensional pattern data of the paper sheet 2. Then, the calculation means 9 calculates the two-dimensional image data of the paper sheet 2 stored in the storage means 8. These are all controlled by a controller (not shown). The conveyance path 1 is controlled so that the paper sheet 2 to be conveyed does not protrude from the side surface in the conveyance path width direction, and it is not necessary to consider the protrusion of the paper sheet 2 from the conveyance path 1.

The operation of the embodiment shown in FIG. 1 will be described with reference to the flow chart shown in FIG. Paper sheet 2 is transport path 1
When it starts being conveyed in the direction of the arrow above, in step 100,
The output signal 31 obtained by scanning the sensor of the one-dimensional reading unit 3 starts to be input to the control unit 6 in the input waiting state, and the detection unit 4 and the detection unit 5 output the output signal 41 and the output signal 51.
Start the output of. When the absolute value of the rotation angle of the paper sheet 2 is equal to or smaller than the rotation angle θmax at which the determination processing can be performed, the paper sheet 2 always reaches the detection means 4 and the detection means 5 before the reading means 3. Further, the paper sheet 2 is detected by the detecting means 4 and the detecting means 5.
When the reading means 3 reaches the reading means 3 before any one of them, the absolute value of the rotation angle of the paper sheet 2 is always larger than the rotation angle θmax at which discrimination processing can be performed.

In step 101, the control means 6 determines whether or not the output signal 41 of the detection means 4, the output signal 51 of the detection means 5 and the output signal 31 of the reading means 3 are equal to or greater than the reference value indicating the presence of the sheet 2. To monitor. Detection means 4 and detection means 5
And the reading means 3 assume that each output signal becomes a reference value indicating the presence of the paper sheet 2 with the edge of the paper sheet 2 reaching the center thereof, and the paper sheet 2 is detected by the detecting means 4 and the detecting means. 5
If the reading means 3 reads the pattern from the reading means 3, the reading means 3 reads the pattern from the reading means 3, and if the reading means 3 reaches the reading means 3 before at least one of the detecting means 4 and the detecting means 5. When reading the pattern of the paper sheet 2, the control means 6 outputs the trigger signal 61 for starting the A / D conversion to the A / D converter 7 in step 102. When the reading of the pattern is stopped, the process returns to step 100 after the time until the sheet 2 passes through the reading unit 3, and the control unit 6 outputs the detection unit 4 until the next sheet is conveyed. The input of the signal 41, the output signal 51 of the detecting means 5 and the output signal 31 of the reading means 3 is awaited.

When the trigger signal 61 is input to the A / D converter 7 in step 102, the process proceeds to step 103. A /
When the trigger signal 61 is input to the D converter 7, the A / D converter 7 A / D converts the output signal 31 of the reading means 3,
The A / D converted digital signal 71 is output to the storage unit 8 as one-dimensional pattern data by a predetermined capacity for image calculation processing, and the A / D conversion is completed. Next, in step 104, the storage means 8 creates and stores the two-dimensional image data of the conveyed paper sheet 2 from the input digital signal 71 which is the one-dimensional pattern data. Further, in step 105, the calculation means 9 performs calculation of the two-dimensional image data stored in the storage means 8, for example, processing such as image differentiation.

It takes time for the arithmetic processing of the electronic circuit until the A / D conversion is started after the rotation angle of the conveyed paper sheet 2 is determined and the trigger signal is output, which is a so-called delay. Time will occur. However, the delay time of this electronic circuit is very small compared to the conveying speed, and the pattern reading for discriminating the paper sheets is sufficiently delayed even if it is started from about 1 mm inside from the peripheral edge of the paper sheets. You may

According to this embodiment, the paper sheet 2 capable of discriminating the paper sheet 2 based on the absolute value of the rotation angle of the paper sheet 2 is used.
If the absolute value of the maximum value of the rotation angle is less than or equal to θmax, the pattern reading can be started before the sheet 2 reaches the reading unit 3, and the pattern reading must be started before the pattern reading is started. The effect that the rotation angle of the paper sheet 2 can be calculated, and unnecessary pattern reading can be eliminated if the absolute value of the rotation angle of the paper sheet 2 exceeds the rotation angle θmax at which discrimination processing can be performed. There is.

Next, FIG. 4 shows the construction of a paper sheet reader of another embodiment to which the present invention is applied. The components having the same functions as those in the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof is omitted. A detection unit 20 installed at the center of the conveyance path 1 and upstream of the reading unit 3 in the conveyance direction to detect arrival of the paper sheet 2.
4 outputs an output signal 241. FIG. 5 shows the positional relationship between the reading means 3 having a one-dimensional sensor and the detecting means 204. The installation distance X between the detection unit 204 and the reading unit 3 in the conveyance direction is the length W of the paper sheet 2 in the conveyance path width direction, and the rotation angle of the paper sheet 2 capable of discriminating the paper sheet 2. The detection means 204 from the end in the width direction of the conveyance path 1 on the side opposite to the side where the leading edge of the sheet 2 conveyed at the maximum absolute value θmax and the rotation angle θmax reaches the reading means 3 first. Is set to Y, and X = (W · cos θmax−Y) tan θmax (Equation 3) is set with reference to the position where the leading edge of the paper sheet 2 first reaches the reading unit 3.

A control means 206 is arranged so as to be connected to the output side of the detection means 204 and the reading means 3, and the output side of the control means 206 is connected to the control signal input side of the A / D converter 7. The control unit 206 monitors the input output signal 31 of the reading unit 3 and the input output signal 241 of the detecting unit 204, detects the arrival of the sheet 2 and outputs the output signal 3 of the reading unit 3.
The trigger signal 61 for starting the A / D conversion of 1 is A / D
Output to the D converter 7.

The operation of the embodiment shown in FIG. 4 will be described with reference to the flow chart shown in FIG. When the sheet 2 starts to be conveyed on the conveying path 1 in the direction of the arrow, the control means 6 in the input waiting state receives the output signal 241 of the detection means 204 and the output signal 31 obtained by scanning the sensor of the one-dimensional reading means 3. It is input (step 300). When the absolute value of the rotation angle of the paper sheet 2 is equal to or smaller than the rotation angle θmax at which the determination processing can be performed, the paper sheet 2 reaches the detection means 204 before the reading means 3. When the paper sheet 2 reaches the reading means 3 before the detection means 204, the absolute value of the rotation angle of the paper sheet 2 is always larger than the rotation angle θmax at which discrimination processing can be performed. The control unit 206 monitors whether or not the output signal 241 of the detection unit 204 and the output signal 31 of the reading unit 3 are equal to or greater than a reference value indicating the presence of the paper sheet 2. The detection means 204 and the reading means 3 are designed so that each output signal becomes a reference value indicating the presence of the paper sheet 2 with the edges of the paper sheet 2 reaching the centers thereof. If the paper sheet 2 reaches the detecting means 204 earlier than the reading means 3, the reading means 3 reads the pattern. If the paper sheet 2 reaches the reading means 3 before the detecting means 204, the reading means 3 reads the pattern. Be canceled.

When the pattern is read, the process proceeds to step 302, where the control means 206 generates the trigger signal 61 for starting the A / D conversion and outputs it to the A / D converter 7. When the reading of the pattern is stopped, the process returns to step 300 after the time until the sheet 2 passes through the reading unit 3, and the control unit 206 outputs the output of the detection unit 204 until the next sheet is conveyed. The input waiting state of the signal 241 and the output signal 31 of the reading means 3 is set. When the trigger signal 61 is output, the process proceeds to step 303. In step 303, when the trigger signal 61 is input to the A / D converter 7, the A / D converter 7 outputs the output signal 31 of the reading means 3.
The digital signal 71 obtained by A / D conversion is output to the storage unit 8 by a predetermined capacity for image calculation processing, and the A / D conversion is completed. Then, step 304
Then, the storage means 8 creates and stores the two-dimensional image data of the paper sheet 2 conveyed from the input digital signal 71. Further, in step 305, the calculation means 9 calculates the two-dimensional image data stored in the storage means 8, for example,
Processing such as image differentiation is performed.

According to this embodiment, if the absolute value of the rotation angle of the paper sheet 2 is equal to or less than the maximum absolute value θmax at which the paper sheet 2 can be discriminated, the paper sheet 2 is always read by the reading means. It is possible to start reading the pattern by the time when the number reaches 3, and it is possible to eliminate useless reading of the pattern when the absolute value of the rotation angle of the paper sheet 2 exceeds the rotation angle θmax at which discrimination processing can be performed. .

Next, another operation of the two embodiments shown in FIGS. 1 and 4 will be described with reference to the flow chart shown in FIG. In step 400, when the sheet 2 starts to be conveyed on the conveying path 1 in the direction of the arrow, the output signal 41, the output signal 51 or the output signal 241 and the output signal 31 are sent to the control means 6 or the control means 206 in the input waiting state. Begins to be entered. If the paper sheet 2 is conveyed, it can always be detected by the reading means 3,
When the absolute value of the rotation angle of the paper sheet 2 is equal to or smaller than the rotation angle θmax at which the determination processing can be performed, differentiation or the like is performed to accurately process the image of the paper sheet 2, so that the paper sheet 2 reaches the reading means 3. The pattern (the pattern obtained by scanning the transport path when there is no sheet 2 and the sensor data) before it is required. In this case, since the paper sheet 2 always reaches the detecting means 4, 5 or the detecting means 204 before the reading means 3, the paper sheet 2 reaches the reading means 3 by the detecting means 4, 5 or the detecting means 204. Can always be detected before. In step 401, the control means 6 or 206 outputs the output signal 41,
51 or the output signal 241 and the output signal 31 are the paper sheets 2
It is monitored whether or not it exceeds a reference value indicating the presence of. When the paper sheet 2 first reaches any one of the detection unit 4, the detection unit 5, or the detection unit 204 and the reading unit 3, the reading unit 3 starts reading a pattern (A / D conversion of the output signal 31). Therefore, when the arrival of the paper sheet 2 is detected, the control unit 6 or the control unit 206 outputs the trigger signal 61 for starting the A / D conversion to the A / D converter 7 in step 402. In step 403, when the trigger signal 61 is input to the A / D converter 7, the A / D converter 7 A / D-converts the output signal 31 of the reading means 3 to obtain a digital signal 71 for image calculation processing. Then, the data corresponding to the predetermined capacity is output to the storage means 8, and the A / D conversion is completed. Next, in step 404, the storage means 8 creates and stores two-dimensional image data of the conveyed paper sheet 2 from the input digital signal 71. Further, step 40
In step 5, the calculation means 9 calculates the two-dimensional image data stored in the storage means 8, for example, performs processing such as image differentiation.

According to the present embodiment, it is possible to read the pattern of a sufficient area in which the sheet 2 can be discriminated regardless of the rotation angle of the sheet 2, so that the sheet 2 being conveyed can be read. There is an effect that the paper sheet 2 can be accurately discriminated without being influenced by the conveyance state.

In the embodiment of the present invention, the one-dimensional sensor of the reading means 3 is arranged at a right angle to the conveying path, but the reading means 3 is arranged obliquely to the center line of the conveying path and two detecting means are used. When the detection means is used, the line connecting the two detection means does not have a positional relationship perpendicular to the center line of the conveyance path, and when one detection means is used, it is not the center of the conveyance path. ,
The installation positions can be calculated by the same formula.

Further, the control means outputs the trigger signal only to the A / D converter, but the output destination of the signal is not limited to this. A signal indicating whether or not to read may be output. For example, it is possible to speed up the control of the transport path by outputting a non-readable signal to the control device of the transport path,
If the reading is impossible, the controller can perform processing other than image processing.

Further, when a plurality of types of paper sheets having different sizes are conveyed, the sensor may be arranged at the position of the minimum value of the distance calculated by each formula.

The output signals of the detecting means and the reading means indicate the presence of the paper sheet at the time when the edge of the paper sheet reaches the center of each sensor, but the setting of the reference value is not limited to this. is not. Further, although the detection means is spot light, it is not limited to this, and slit light or the like may be used. Further, the pattern displayed on the paper sheet may be a magnetically displayed pattern and the straight sides may be magnetically displayed, and the detection means and the reading means may detect the magnetism.

[0035]

According to the present invention, when the rotation of the conveyed sheet is within the range in which the sheet can be discriminated by the control means, the sheet is always detected before the sheet reaches the reading means. Then, the reading of the pattern from the output of the reading means can be started, so that it is possible to read from the paper sheet the pattern of a sufficient area where the discrimination processing of the paper sheet is possible. Further, if the paper sheet reaches the reading means before the detection means, it can be detected that the rotation of the paper sheet exceeds the discriminable range, so that unnecessary pattern reading is not performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of an embodiment of the present invention.

FIG. 2 is a plan view showing a positional relationship between a reading unit and a detecting unit according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating the operation of the exemplary embodiment of the present invention.

FIG. 4 is a block diagram showing a main configuration of another embodiment of the present invention.

FIG. 5 is a plan view showing a positional relationship between a reading unit and a detecting unit according to another embodiment of the present invention.

FIG. 6 is a flowchart illustrating the operation of another embodiment of the present invention.

FIG. 7 is a flowchart illustrating an example of another operation according to the exemplary embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 conveyance path 2 paper sheets 3 reading means 4, 5,204 detection means 6,206 control means 7 A / D converter 8 storage means 9 computing means 31 output signal 41 output signal 51 output signal 61 trigger signal. 71 Digital signal 241 Output signal

Claims (6)

[Claims] 1. A one-dimensional reading means for reading a pattern of paper sheets conveyed on a conveyance path in a width direction of the conveyance path with a straight side facing the traveling direction, and a one-dimensional reading means installed on the upstream side of the reading means in the conveyance direction. At least 2 for detecting the arrival of said paper sheet
In a paper sheet reader including individual detecting means,
The installation distance Y of the two detection means from the far side end of the conveying path is H, the width of the conveying path is W, and the length of a straight line side in the traveling direction of the paper sheet is W. , Θmax is the maximum absolute value of the in-plane rotation angle formed by the straight line side capable of discriminating the paper sheets with the center line of the reading means, and there is a relationship of Y ≦ W · cos θmax, and the absolute value of the angle is Is θmax, the installation distance X in the transport direction between the detecting means and the reading means on the side opposite to the side where the leading edge of the sheet first reaches the reading means is equal to the leading edge of the sheet. A paper sheet reader, wherein X = (W · cos θmax + Y−H) tan θmax with reference to the position that first reaches the reading means. 2. A one-dimensional reading means for reading a pattern of a paper sheet conveyed on a conveying path in a width direction of the conveying path with a straight side facing the traveling direction, and a one-dimensional reading means installed on the upstream side in the conveying direction of the reading means. In the paper sheet reading apparatus including one detection means for detecting the arrival of the cut paper sheet, the installation distance X between the detection means and the reading means in the conveyance direction is W is the length of the straight line side directed in the direction, θmax is the maximum absolute value of the in-plane rotation angle formed by the straight line side capable of discriminating the paper sheet with the center line of the reading means, and the absolute value of the angle. Is θmax, the installation distance of the detection means from the widthwise end of the conveyance path on the side opposite to the side where the leading edge of the paper sheet first reaches the reading means is Y, and the paper sheet is With reference to the position where the tip of the class first reaches the reading means, X = (W · cos θmax Y) paper sheet reading apparatus characterized by being configured Tanshitamax. 3. A one-dimensional reading means for reading a pattern of paper sheets conveyed on a conveyance path in a width direction of the conveyance path with a straight side facing the traveling direction, and a one-dimensional reading means installed upstream of the reading means in the conveyance direction. At least two detecting means for detecting the arrival of the paper sheet, and a control means for determining whether or not the pattern reading of the paper sheet is necessary according to the output signals of the reading means and the detecting means. And the installation distance Y of the two detection means from the end on the far side in the width direction of the conveyance path is such that the width of the conveyance path is H and the length of a straight side directed in the traveling direction of the paper sheets. And W is the maximum value of the absolute value of the in-plane rotation angle formed by the straight line side capable of discriminating the paper sheets with the center line of the reading means, and there is a relationship of Y ≦ W · cos θmax, When the absolute value of the angle is θmax, the leading edge of the paper sheet is first The installation distance X in the transport direction between the detecting means and the reading means on the side opposite to the side that reaches the picking means is X = (W, with reference to the position where the leading edge of the paper sheet first reaches the reading means. Cos θmax + Y−H) In the signal processing method of the paper sheet reader set to tan θmax, the control means monitors the output signals of the two detection means and the output signal of the reading means, When the sheet reaches the two detecting means before or at the same time as the reading means, the reading means starts reading the pattern of the paper sheet, and the paper sheet precedes at least one detecting means. The signal processing method of the paper sheet reading apparatus, wherein the reading means does not read the pattern of the paper sheet when it reaches the reading means. 4. A one-dimensional reading means for reading a pattern of a paper sheet conveyed on a conveying path with a straight side directed in the traveling direction in a width direction of the conveying path, and a reading means installed upstream of the reading means in the conveying direction. And a control unit for determining whether or not the pattern reading of the paper sheet is necessary according to the output signals of the reading unit and the detection unit. The installation distance X of the detection unit and the reading unit in the transport direction is W, where the length of the straight line side in the traveling direction of the paper sheet is W, and the straight line side capable of discriminating the paper sheet. Is the maximum absolute value of the in-plane rotation angle formed by the center line of the reading means, and the absolute value of the angle is θmax.
In the state, the installation distance of the detection means from the end in the width direction of the conveyance path on the side opposite to the side where the leading edge of the paper sheet first reaches the reading means is Y, and In the signal processing method of the paper sheet reading apparatus, wherein X = (W · cos θmax−Y) tan θmax is set based on the position where the leading edge first reaches the reading means, the control means includes the one detecting means. Output signal of the reading means and the output signal of the reading means, and when the paper sheet reaches the detecting means before or at the same time as the reading means, the reading of the pattern of the paper sheets by the reading means is started. However, when the paper sheet reaches the reading means before the detecting means, the reading means does not read the pattern of the paper sheet. Method. 5. A one-dimensional reading means for reading a pattern of a paper sheet conveyed on a conveying path with a straight side directed in the traveling direction in the width direction of the conveying path, and a one-dimensional reading means installed upstream of the reading means in the conveying direction. At least two detecting means for detecting the arrival of the paper sheet, and a control means for determining whether or not the pattern reading of the paper sheet is necessary according to the output signals of the reading means and the detecting means. And the installation distance Y of the two detection means from the end on the far side in the width direction of the conveyance path is such that the width of the conveyance path is H and the length of a straight side directed in the traveling direction of the paper sheets. And W is the maximum value of the absolute value of the in-plane rotation angle formed by the straight line side capable of discriminating the paper sheets with the center line of the reading means, and there is a relationship of Y ≦ W · cos θmax, When the absolute value of the angle is θmax, the leading edge of the paper sheet is first The installation distance X in the transport direction between the detecting means and the reading means on the side opposite to the side that reaches the picking means is X = (W, with reference to the position where the leading edge of the paper sheet first reaches the reading means. Cos θmax + Y−H) In the signal processing method of the paper sheet reader set to tan θmax, the control means monitors the output signals of the two detection means and the output signal of the reading means, The signal processing method of the paper sheet reading apparatus, wherein reading of the pattern of the paper sheet by the reading means is started at the time when the first reading means reaches either the reading means or the two detecting means. . 6. A one-dimensional reading means for reading a pattern of paper sheets conveyed on a conveying path with a straight side in the traveling direction in a width direction of the conveying path, and a one-dimensional reading means installed upstream of the reading means in the conveying direction. And a control unit for determining whether or not the pattern reading of the paper sheet is necessary according to the output signals of the reading unit and the detection unit. The installation distance X of the detection unit and the reading unit in the transport direction is W, where the length of the straight line side in the traveling direction of the paper sheet is W, and the straight line side capable of discriminating the paper sheet. Is the maximum absolute value of the in-plane rotation angle formed by the center line of the reading means, and the absolute value of the angle is θmax.
In the state, the installation distance of the detection means from the end in the width direction of the conveyance path on the side opposite to the side where the leading edge of the paper sheet first reaches the reading means is Y, and In the signal processing method of the paper sheet reading apparatus, wherein X = (W · cos θmax−Y) tan θmax is set based on the position where the leading edge first reaches the reading means, the control means includes the one detecting means. Of the pattern of the sheet by the reading unit when the sheet first reaches either the reading unit or the one detecting unit by monitoring the output signal of the reading unit and the output signal of the reading unit. A signal processing method for a paper sheet reading device, characterized by starting reading.