JPH0792851B2 - Width detection method for paper sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to a method for detecting the dimensional width of paper sheets such as banknotes. The general-purpose optical detection element is shifted to use a fortune number sequence, and the dimensional width of the paper sheets may be misset. With the aim of providing a width detection method that can measure with high accuracy without any need, parallel n rows of photoelectric detection elements arranged at intervals of n times the required measurement unit in the input conveyance path of paper sheets The measurement unit is shortened by the measurement unit, the target width direction of the paper sheet is set on the measurement unit substantially parallel to the detection element, and the sheet is conveyed in the direction orthogonal to the element array, and the width of the paper sheet is detected by the detection element array. In the width detection method for measuring the length in the direction, the position of the paper sheet measured in the first row of the detection element is the position of the second row measured at the timing of the width measurement of the paper sheet according to the transport speed. Read the data in the second column, and so on. Synchronization to be configured to read the data of n columns.

[Industrial application field]

The present invention relates to a method for detecting the width of paper sheets such as banknotes.

[Conventional technology]

2. Description of the Related Art Conventionally, in automated teller machines that handle banknotes, in order to prevent erroneous payments due to set mistakes of banknotes, a method of measuring and identifying dimensions separately from banknote discrimination is widely used.
New bills issued after 1984 have the same short side length, so it is necessary to detect the length of the long side. In order to shorten the processing time for old banknotes, the short side was conveyed and the difference in the length of the short side was detected by the passage time, but this method cannot be applied to new banknotes.

Therefore, in order to shorten the time, the new bills are conveyed in the short side direction in the same manner as the old bills, and the long side is divided into a plurality of long side edges as shown in Fig. 4 (a). A method of arranging the photoelectric detection elements 2 side by side for detection is adopted.

By the way, the difference in the long side width of 10,000 yen, 5,000 yen or 5,000 yen, 1,000 yen banknotes is about 5 mm, but the minimum measurement interval, that is, the measurement accuracy of about 1 mm is necessary considering some skewed sets. . Therefore, it suffices to provide a detection element set to such a minimum measurement interval, but there is a problem that it is expensive and unreliable because it is a special small detection element.

Therefore, as shown in FIG. 2B, if a general inexpensive and highly reliable sensing element 11 is used, the minimum measurement interval is about 3 mm, so that both ends are offset by 1 mm to form a three-row parallel array. , The banknotes 1 are detected at the same time when the banknotes 1 come over the three rows of detection elements, and as shown in FIG. 3B, dimensional information with an accuracy of about 1 mm is obtained.

[Problems to be Solved by the Invention]

As shown in FIG. 3 (b), the banknote 1
Normal measurement is possible when the long sides of the bills are substantially parallel. However, as shown in FIG. 3 (c), if there is some skew in the set of the banknote 1, the detection unit indicated by a black circle Although the data accuracy on the left side can be obtained, the data on the right side is missing, and the high accuracy of the whole cannot be obtained. In this case, the lack of data on one side is a problem, and if the skewing itself is mild, it is not necessary to correct it. If necessary, it is easy to prepare a correction coefficient according to the angle and convert it in the forward direction. is there.

It is an object of the present invention to provide a width detection method capable of measuring the dimensional width of paper sheets such as banknotes with high accuracy without a risk of missetting, by using a plurality of rows of optical detection elements for general use.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, in the input conveyance path of the paper sheet, parallel n rows of photoelectric detection elements arranged at intervals of n times the required measurement unit are shortened at both ends by the measurement unit. The target sheet width direction of the sheet is set substantially parallel to the detection element array on the sheet, and the sheet is conveyed in the direction orthogonal to the element array. In the width detection method for measuring the width of the paper sheet, when the position of the paper sheet measured in the first row of the detection element is aligned with the conveyance speed, the position of the paper sheet in the second row is measured. The data in the second column is read, and thereafter, the data in the n-th column is similarly read in synchronization with the transport speed.

[Action]

As shown in FIGS. 1A to 1C, after the banknote 1 is detected in the first row of the photoelectric detection element group 10, this position is conveyed to the second row in parallel. Second
The third row is detected at the timing when the third row is detected and similarly the third row is conveyed.

As a result, if the data on both sides of the first column is set so as not to be lost, the second and third columns will not be lost, and complete high-accuracy measurement becomes possible. Is the long-side information measured by the result of
A length of m precision is obtained. In this case, skew correction is performed if necessary as described above, but this is not the gist of the present invention.

〔Example〕

2 (a) and 2 (b) are configuration explanatory views of an embodiment of the present invention.

FIG. 1A shows an example of the detection circuit of the pair of optical detection elements 11. The banknote 1 passes between the light emitting element 11a and the light receiving element 11b. The primary circuit has a light emitting element 11a and a resistor R ₁ and is driven by a voltage E ₁ . Secondary circuit is driven by a voltage E ₂ has a light-receiving element 11b resistor R _2, and outputs the changed voltage at the time when a translucent shielding, any constant voltage has a resistance R ₃ in parallel The output is made and both outputs are inputted to the comparator 12 so that the "H" signal when light is shielded and the "L" signal is obtained when light is transmitted as shown in the figure.

FIG. 3B is a configuration diagram corresponding to the principle explanatory diagram. That is, the first row first stage, the second row first stage of the elements arranged in three rows of the optical detection element group 10 shown in the principle explanatory diagram of FIG.
Outputs P ₁ , P ₂ , of 1st stage of 3rd column, 2nd stage of 1st column
Take out P ₃ , P ₄ ... and sort them as 1st latch 21, 2nd latch 22, 3rd latch 23, 1st latch 21. Then, the first latch 21 is driven by a trigger input from a trigger generator (not shown), the delay circuit 24 delays a predetermined timing to drive the second latch 22, and the delay circuit 25
Then, the third latch 23 is driven with a predetermined timing shift.

These first latch 21, second latch 22, third latch 23, first
Take the outputs S0, S1, S2, S3 ... from the latch 21 .... The output signals S0, S1, S2, S3 ... Are used as the width information of the paper sheets.

With the above configuration, the current state is first stored in the first latch 21, and after the predetermined timing, the second latch 22 is further delayed by the predetermined timing and stored in the third latch 23. As a result, the first latch 21 is stored.
The long-side direction information of the banknote as shown in the figure is obtained.

〔The invention's effect〕

As described above, according to the present invention, since the general-purpose optical detecting elements are shifted and used in a plurality of rows, the number is large, but the cost is still low and the reliability is high. In addition, by using the method of detecting at multiple timings in synchronization with the conveyance of banknotes, if the initial detection is successful, the data on both sides will not be lost in subsequent detection, and overall high-precision dimension measurement will be secured. can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the principle of the present invention, FIGS. 2 (a) and 2 (b) are explanatory views of an embodiment of the present invention, and FIGS. 3 (a) to 3 (c) are conventional examples. 1 is a bill, 10 is an optical detection element group, 11 is a detection element, 11a is a light emitting element, 11b is a light receiving element, 12
Is a comparator, 21, 22 and 23 are latches, and 24 and 25 are delay circuits.

Claims (1)

[Claims] 1. A required measurement unit, n, is provided in an input conveyance path for paper sheets.
Parallel n rows of photoelectric detection elements arranged at a double interval are provided with the both ends being shortened by the measurement unit respectively, and the target width direction of the paper sheet is set on the parallel n rows substantially parallel to the detection element rows. In a width detection method in which the sheet is conveyed in a direction orthogonal to the element row and the width of the sheet in the width direction is measured by the detection element row, the width measurement timing of the sheet is detected according to the conveyance speed. By reading the data of the second row when the position of the paper sheet measured in the first row of the element reaches the position of the second row, and by reading the data of the nth row in synchronization with the transport speed in the same manner, A width detection method for paper sheets characterized by determining the length of the paper sheet in the width direction from the range detected at each timing.