JPH06191680A - Detection device for double transmission - Google Patents

Abstract

PURPOSE:To enhance accuracy in judement by integrating thickness over the carrier length of a medium so as to be compared with the thickness integral capacity for one piece of the medium, and thereby judging whether or not double transmission takes place. CONSTITUTION:The presence or the absence of a medium 6 to be carried is detected by a medium detecting means 7, and the thickness of the medium 6 is then detected by a thickness detecting means 8. An integration means 10 integrates thickness over the carrier length (a space for an existence of a detected signal (a)) of the medium 6 based on the detected signal (a) by the medium detection means 7 and the detected signal (c) by the thickness detection means 8. An operation means 11 takes in an integral capacity (f) and an thickness integral capacity R for one piece of a normal medium recorded on a reference value storing means 9, the ratio (g) of both the integral capacities is obtained so as to be inputted to a double transmission judging means 12, so that it is judged whether or not double transmission takes place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a heavy running of a medium such as a bill used in an automatic depositing / dispensing machine, an automatic vending machine, or the like.

[0002]

2. Description of the Related Art Generally, in an automatic depositing / dispensing machine, banknotes inserted by a customer or banknotes stored in a device are separated one by one in accordance with transactions such as depositing and dispensing transactions. After the species and authenticity are discriminated, they are collected and processed for deposit or withdrawal. Then, in such a device, a double running detection device is used to determine whether or not a medium such as a banknote is reliably conveyed one by one. Such an overrun detection device is a device that detects whether or not one medium is conveyed or several mediums are overlapped, and a thickness, a transmitted light amount, or the like of the medium to be conveyed is set as a predetermined reference. Overrun was detected by comparing with the value.

In the above-mentioned overrun detection, in the method of discriminating the thickness of the conveyed medium, a detection roller which is in contact with the medium and changes according to the thickness is used to detect the thickness of the medium. Further, in the method of making a determination based on the amount of transmitted light of a medium, a light emitting diode, a photodiode, a phototransistor, or the like is installed in order to detect the amount of transmitted light so that the medium to be conveyed is sandwiched.

FIG. 2 is a block diagram of a conventional heavy running detection device. This overrun detection device is a device of the type that performs overrun determination based on the thickness of the conveyed medium, and a configuration for performing overrun determination based on the thickness of the conveyed medium will be described below.

The apparatus shown in the figure comprises a medium detecting means 1, a thickness detecting means 2, a reference value storing means 3, a comparing means 4 and a comparison result judging means 5. The medium detecting means 1 is a means for detecting the arrival of a medium (banknote or the like) to be conveyed, and is composed of a light emitting diode, a photodiode or the like. The thickness detecting means 2 is a means for detecting the thickness of the medium to be conveyed, and is composed of a detection roller or the like that comes into contact with the medium and is displaced according to the thickness. The reference value storage unit 3 is a memory that stores the upper limit value of the thickness of one normal medium. The comparison means 4 compares the output (detection result) of the thickness detection means 2 with the reference value stored in the reference value storage means 3, and outputs the comparison result to the comparison result determination means 5. It is a vessel. Further, the comparison result determination means 5 stores the comparison result by the comparison means 4 for each conveyed medium, and outputs the comparison result to a host device (not shown).

Next, the operation of the overrun detecting device having the above construction will be described. The medium detection unit 1 detects the medium to be conveyed and outputs a medium detection signal to the comparison result determination unit 5.
The comparison result judging means 5 prepares to judge an overrun from the comparison result of the comparing means 4 by the medium detection signal from the medium detecting means 1. On the other hand, the reference value storage means 3 takes out the upper limit reference value of the thickness of one normal medium and compares it with the upper limit reference value.
Output to. The comparison means 4 compares the reference value supplied from the reference value storage means 3 with the detection result of the thickness detection means 2 and outputs the comparison result to the comparison result determination means 5. Based on the comparison result from the comparison unit 4, the comparison result determination unit 5 makes a double-run determination each time a medium arrives, and outputs the double-run determination result to the host device.

Next, the operation of the medium overrun determination in the comparison means 4 and the comparison result determination means 5 will be described. Figure 3
FIG. 7 is an explanatory diagram of the overrun determination operation. In FIG.
The medium detection signal a is a signal output from the medium detection means 1, and means that the medium is not detected when "0" and the medium is detected when "1". The reference value b is the upper limit reference value stored in the reference value storage means 3, and the thickness detection signal c indicates the detection pattern of the thickness of the medium output from the thickness detection means 2. The thickness detection signal c
In, the medium is thicker as the waveform is higher, and the medium is thinner as the waveform is lower. Upper limit reference value b
Is preset such that its value is larger than the thickness of one normal medium and smaller than the thickness of two mediums.

The comparison result d is a comparison result output from the comparison means 4, and becomes "1" when the thickness detection signal c exceeds the reference value b, and becomes "0" when it does not exceed the reference value b. Therefore, when this signal is "0", the thickness of the medium is normal, and when this signal is "1", the thickness of the medium is two or more. The judgment result e is the judgment result output from the comparison result judging means 5, and when the signal is “0”, the medium conveyed is normal,
When it is "1", it means that it is determined that the conveyed medium is overrun. The medium detection signal a to the determination result e are
It corresponds to the signals a to e in FIG.

FIG. 4 shows an example of a medium corresponding to the judgment operation of FIG. In FIG. 4, the medium A is in a normally conveyed state, the medium B is in a state in which two sheets of the medium are conveyed in an overlapping manner with almost no deviation, and the medium C is in a state in which two sheets of the medium are conveyed with a large deviation. is there.

First, in the case of the medium A, when the medium A is conveyed, the medium detecting means 1 detects the arrival of the medium A, and the medium detection signal a changes from "0" to "1". Since the medium detection signal changes from "0" to "1", the comparison result determination means 5 sets the output to "0" and prepares to determine the double running of the arrived medium. As described above, since the medium A is a normal one sheet of carrier medium, the thickness detection signal c has a value smaller than the reference value b. Therefore, the comparison result d is "0"
The determination result e is “0” and the medium A is determined to be normal.

Next, in the case of the medium B, since the two media are conveyed while being superposed with almost no displacement, the thickness detection signal c is a value larger than the reference value b. Therefore, the comparison result d becomes "1", the judgment result e becomes "1", and the medium B is judged to be overrun. Further, in the case of the medium C, since the two media are conveyed while being offset from each other, the thickness detection signal c has a value larger than the reference value b in the portion where the media overlap. . Therefore, the comparison result d becomes "1", and the judgment result e becomes "1".
Is determined to be overrun.

[0012]

However, in the above-described conventional overrun detecting device, no matter how many sheets are stacked and conveyed, the determination result is simply overrun, and the number of overruns is unknown. Therefore, there is a problem that the number of conveyed media cannot be determined. Further, for example, there is a problem in that it is impossible to distinguish between a medium in a normal transport state in which a tape or the like is attached to a part of the medium and a medium in a heavy running state.

Hereinafter, such problems will be described. Figure 5
6A and 6B are an explanatory diagram of the overrun determination operation and an explanatory diagram of an example of the medium. First, in FIG. 6, the medium A is a medium in the normal transport state, like the medium A in FIG. Further, the medium D is in a state in which the three mediums are overlapped and conveyed with almost no deviation. Further, the medium E has a tape attached to a part of the medium, and E1 shows the tape attachment portion. Further, in FIG. 5, the medium detection signal a to the determination result e are the same as the medium detection signal a to the determination result e in FIG.

First, since the medium A has been described above, the description thereof is omitted here, and the cases of the mediums D and E will be described. The thickness detection signal c of the medium D with three sheets running over becomes a larger value than the thickness detection signal c of the medium B with two sheets running over, but the reference value b
Since the comparison result d and the determination result e are both the same as the comparison result d and the determination result e in FIG.
Is the same as That is, it is impossible to discriminate between the medium B on which two sheets have run over and the medium D on which three sheets have run over, and as a result, the number of transported media cannot be determined. On the other hand, in the case of the medium E to which the tape is attached, the thickness detection signal c exceeds the reference value b at the tape attachment portion E1 even though it is originally in the normal transport state, and therefore, the weight of It was mistaken for running.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is possible to reliably perform a double-run determination even on a medium to which a tape or the like is attached, and moreover, run three or more sheets. It is an object of the present invention to provide a heavy running detection device capable of detecting the number of conveyed media.

[0016]

According to a first aspect of the present invention, there is provided an overtravel detecting device, which is a medium detecting means for detecting the presence or absence of a medium to be conveyed, and a thickness detecting means for detecting the thickness of the medium. The thickness of the medium detected by the thickness detecting means,
An integrating unit that integrates based on the transport length of the medium detected by the medium detecting unit; a reference value storing unit that stores a preset reference value of the integrated amount of the thickness of one normal medium; Computation means for obtaining a ratio between the integral value of the thickness of the medium output by the integration means and the reference value, and overrun discrimination means for performing overrun discrimination of the medium based on the value obtained by the computation means. It is characterized by having.

In the overrunning detection device of the second invention, the medium detecting means for detecting the presence / absence of the medium to be conveyed, the thickness detecting means for detecting the thickness of the medium, and the thickness detecting means are detected. Integrating means for integrating the thickness of the medium based on the transport length of the medium detected by the medium detecting means, and a preset thickness of one normal medium to a plurality of thicknesses of the medium Reference value storage means for storing a reference value of the integrated amount for each number of sheets, comparison of the integrated value of the thickness of the medium output by the integration means, and a plurality of reference values stored in the reference value storage means Then, a magnitude relationship between the integrated value and each reference value is obtained, and based on this magnitude relationship, a computing unit that computes how many sheets of the medium are conveyed in an overlapping manner, and based on the value obtained by the computing unit Equipped with means for determining overrun of the medium It is characterized in that the. It is a thing.

[0018]

In the overrun detecting device of the first aspect of the present invention, when the medium is conveyed to the predetermined position, the medium detecting means detects the arrival of the medium. And the thickness detecting means is
The thickness of the medium to be conveyed is detected. The integrating means integrates the thickness of the medium from the thickness detecting means based on the transport length of the medium obtained from the detection signal of the medium detecting means, and outputs the integration result to the calculating means. The calculation means obtains the ratio of the reference value stored in the reference value storage means and the integration result from the integration means, and outputs this to the overrun determination means. The overrun determination means detects whether the medium is overrun, and if overrun, detects the number of overrun sheets based on the calculation result of the operation means.

In the overrunning detection device of the second invention, the medium detection, medium thickness measurement, and medium thickness integration processing are
This is performed in the same manner as the overrun detection device of the first invention. Then, the calculation means compares the plurality of reference values stored in the reference value storage means with the values of the integration results, obtains the magnitude relationship between them, and further, the media are conveyed in an overlapping manner based on the magnitude relationship. Calculate whether or not. The overrun determination means detects whether the medium is overrun, and if overrun, detects the number of overrun sheets based on the calculation result of the operation means.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings. << First Embodiment >> FIG. 1 is a block diagram showing a first embodiment of the heavy running detection apparatus of the present invention. The apparatus shown in the figure has a medium detecting means 7, a thickness detecting means 8, a reference value storing means 9, and an integrating means 1.
0, a calculation unit 11, and an overrun determination unit 12.

The medium detecting means 7 is a detecting means for detecting the presence or absence of the medium 6 such as a banknote being conveyed by an optical means such as reflected light or transmitted light and outputting a detection signal (medium detection signal). There is a photoelectric conversion element such as a light emitting diode, a phototransistor, or a photodiode. The thickness detecting unit 8 is a unit that detects the thickness of the medium 6 that is conveyed, converts the thickness of the medium 6 into an electric signal, and outputs the detection signal (thickness detection signal). . That is, the thickness detecting means 8 detects the detection roller that is in contact with the medium 6 and is displaced according to the thickness thereof, and the mechanical displacement of the detection roller.
It is composed of a converter that converts electrical displacement such as resistance value, electrostatic capacity, and inductance. The reference value storage means 9 is a storage device that stores the lower limit value of the thickness of one normal medium.

The integrating means 10 has one input end connected to the output end of the thickness detecting means 8 and the other input end connected to the output end of the medium detecting means 7, and these medium detecting signal and the thickness. Based on the detection signal, the output signal (medium thickness) of the thickness detecting means 8 is integrated with respect to the length in the conveying direction for each one of the conveyed mediums 6 (one set in the overrun state). , And outputs the integration result.

The computing means 11 outputs the output of the integrating means 10 and
It has a function of inputting the output of the reference value storage means 9 and the output of the medium detection means 7, and calculating the ratio between the integral value of the thickness of the medium 6 and the reference value based on these outputs. That is, the computing means 11 is one medium (or one set) to be conveyed.
Output signal of the integrating means 10 (integrated value of the thickness of the medium) for each
Is the dividend, and the reference value stored in the reference value storage means 9 is the divisor, these division operations are performed, and the division result is output to the overrun determination means 12. The overrun determination unit 12 has a function of inputting the output of the operation unit 11 and determining the number of overruns in the overrun determination and the overrun state based on the input operation result. is doing.

Next, the operation of the heavy running detector constructed as above will be described. FIG. 7 is a waveform diagram of the output signal of each unit for explaining the operation. FIG. 7 shows an example of three sets of media A, B, and C, and these media are the same as the media of FIG. 4 used in the description of the conventional art. That is, the medium A is the medium 6
In the normal conveyance state, the medium B is a state in which the two media 6 are conveyed while overlapping with almost no displacement, and the medium C is in a state in which the two media 6 are conveyed with a large deviation. Further, the medium detection signal a to the division result g in FIG. 7 and FIG. 8 described later correspond to the signals a to g in FIG. 1, respectively.

First, the output from the medium detecting means 7 outputs a signal of "1" when the medium 6 is detected, and outputs a signal of "0" when the medium is not detected. The medium detection signal a in FIG. 7 shows this waveform. When the arrival of the medium 6 is notified by the output from the medium detecting unit 7 that detects the arrival of the conveyed medium 6, that is, when the output from the medium detecting unit 7 changes from “0” to “1”,
The calculating means 11 resets the division result of the immediately preceding medium 6 as preparation for detecting the double running of the conveyed medium 6.

As the medium 6 is gradually transported, the thickness detecting means 8 detects the thickness of the transported medium 6 and outputs the detection result to the integrating means 10. An example of the thickness of the medium 6 (thickness detection signal) detected by the thickness detecting means 8 is shown in FIG. Further, the value of the thickness detection signal c becomes the “thick” direction of the arrow as the thickness of the medium 6 is detected thicker, and becomes the “thin” direction as the thickness is detected thinner.
The integrating means 10 integrates the thickness detection signal c of the medium 6 output by the thickness detecting means 8 and outputs an integration result f. The integration process is continued while the medium detection signal a is "1",
While the medium detection signal a is "0", the integration result f is reset and "0" is output. Further, in FIG. 7, the reference value R shown by a broken line is the lower limit value of the integrated value of the thickness of one medium stored in the reference value storage means 9, which is a standard value in advance. It is a reference value experimentally obtained from the integrated value of the medium 6.

The medium detecting signal a of the calculating means 11 is "1".
The integration result f when changing from “0” to “0” is divided by the integral value of the thickness of one medium 6 stored in the reference value storage means 9, and the quotient is stored in the overrun determination means 12. Output.
The output of the division result is shown in g of FIG. In the division result g in the figure, what is indicated by a broken line is "1" from the bottom,
"2" ..., which means that the number of conveyed sheets is 1, 2, ... The double running determining means 12 determines that there is no double running when the calculation result of the computing means 11 is "1", and determines that there is two sheets double running when the result is "2". The result is output to a host device (not shown).

When a normal medium such as the medium A is conveyed, the maximum value of the integration result f of the thickness detection signal c, that is, the integrated value of the thickness of one medium A is IA. Is greater than or equal to 1 and less than twice the reference value R stored in the reference value storage means 9. Similarly, when the values of the integration result f of the detection signals c of the medium B and the medium C are respectively IB and IC, both are more than twice and less than three times the reference value R stored in the reference value storage means 9. Becomes When this is expressed by an equation, the following equations (1) to (3) are obtained. R≤IA <2R (1) 2R≤IB <3R (2) 2R≤IC <3R (3)

The calculating means 11 divides the integrated values IA, IB and IC of the thicknesses of one set of each of the media A, B and C by the reference value R stored in the reference value storage means 9, and The quotient is output to the overrun determination means 12. Therefore, the media A, B, C
The respective outputs corresponding to are 1, 2, and 2. Then, the overrun determination unit 12 determines that the medium A is in the normal transport state (the number of transported sheets is 1) and the medium B and the medium C are in the double-run state based on the calculation result.

Next, an example will be described for a three-sheet overrun and a medium to which a tape is attached, which has problems in the conventional overrun detector. FIG. 8 is a waveform diagram for explaining this. In the figure, medium D and medium E are the same as medium D and E shown in FIG. Similar to the process for the media A, B, and C, the integration results f are obtained for the media D and E, and the integration results f are respectively ID and I.
Letting E be the relation between ID, IE and the reference value R, the following equations (4) and (5) are obtained. 3R≤ID <4R (4) R≤IE <2R (5)

Therefore, the outputs of the medium D and the medium E output from the computing means 11 are 3, 1 respectively, and when three sheets are overrun, the number of sheets can be discriminated. Can be detected. Moreover, the medium E, which was conventionally erroneously determined to be in the overrun state, can be accurately overrun.

It should be noted that it is conceivable that the overrun determination of the medium 6 is performed based on the average value of the thickness of the medium. However, as compared with the determination based on such average value, the medium is different as in the first embodiment. The discrimination based on the integral value of the thickness of 6 has the following advantages. For example, when a plurality of media are conveyed in a shifted state, the average value of the thickness of the media does not necessarily become the value of the thickness of the number of overrun sheets.
For example, in the case of the above-described medium C, the average value of the thickness is not equal to that of the two sheets because it is largely deviated, and when the division operation with the reference value is performed with such an average value, " The misjudgment result is "no overrun".

On the other hand, if the integrated value of the thickness of the medium 6 is used as in the above embodiment, even if the medium 6 is largely deviated (that is, the medium 6 is slightly overlapped). As a result, the accurate number of overruns can be calculated, and a reliable overrun determination can be performed irrespective of the shift state of the medium 6, and a tape or the like is attached to a part of the medium 6 like the medium E. It is possible to make accurate determinations even for those that have been registered.

<< Second Embodiment >> FIG. 9 is a block diagram showing a second embodiment of the heavy running detection apparatus according to the present invention. The apparatus shown in the figure has a medium detecting means 7, a thickness detecting means 8 and an integrating means 1.
0, a reference value storage unit 13, a calculation unit 14, and an overrun determination unit 15. Here, since the medium detecting means 7, the thickness detecting means 8 and the integrating means 10 have the same configurations as those of the first embodiment, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

The reference value storage means 13 is a storage device for storing a plurality of reference values, and includes a first reference value storage unit 13-1.
Second reference value storage unit 13-2, ... Nth reference value storage unit 1
It is composed of 3-n. First reference value storage unit 13-
1 stores the lower limit of the thickness of one normal medium 6, and the second reference value storage unit 13-2 has a function of storing the lower limit of the thickness of two normal media 6. Similarly, the n-th reference value storage unit 13-n stores the lower limit value of the thickness of n normal media.

The calculating means 14 includes the integrated value of the thickness of the medium output from the integrating means 10 and the first to nth reference value storage sections 13.
It is a means for comparing the output values of −1 to 13-n and calculating how many sheets of the medium are overlapped and conveyed based on the comparison result. The comparing means 16-1, 16-2, ... ,
16-n and a priority encoder 17.

Based on the medium detection signal from the medium detecting means 7, the first comparing means 16-1 has a medium present state of the medium 6 to be conveyed (one sheet in the normal conveying state, one in the double running state).
For each set), the output signal of the integrating means 10 (the integrated value of the thickness of the medium) is compared with the reference value stored in the first reference value storage unit 13-1, and so on. In addition, the second comparing means 16-2 has one sheet (or 1 sheet) of medium to be conveyed.
For each group, the output signal of the integrating means 10 (the integrated value of the thickness of the medium) is compared with the reference value stored in the second reference value storage section 13-2. -N is
The integrating means 10 is provided for each of the conveyed media (or one set).
Output signal (integrated value of the thickness of the medium) and the reference value stored in the nth reference value storage unit 13-n.

Further, the priority encoder 17
Is the comparison means 1 whose input end of the LSB (least significant bit) is
6-1 is connected to the output terminal, the second input terminal from the LSB is connected to the output terminal of the comparison means 16-2, and similarly, MS
The input end of B (most significant bit) is connected to the output end of the comparison means 16-n, and based on the output from the medium detection means 7, for each medium (or one set) conveyed, from the MSB. It has a function of weighting the comparison result input to the LSB and outputting the comparison result as a numerical value to the overrun determining unit 15.

Next, the operation of the second embodiment constructed as described above will be explained. FIG. 10 is a waveform diagram of each part for explaining the operation. In addition, in FIG.
Although examples of three sets of media A, B and C are shown, these media are the same as the media A, B and C of FIG. 4 used in the description of the prior art. And FIG.
And the medium detection signal a to encoder output j in FIG. 11 described later correspond to the signals a to j in FIG. 9, respectively.

The output from the medium detecting means 7 outputs a signal of "1" when the medium 6 is detected, and outputs a signal of "0" when the medium 6 is not detected. The medium detection signal a in FIG. 10 shows this detection signal. Each of the comparing units 16-1 to 16-n is notified of the arrival of the medium by the output from the medium detecting unit 7 which detects the arrival of the conveyed medium 6, that is, the output from the medium detecting unit 7. When the value changes from "0" to "1", the comparison result of the immediately preceding medium 6 is reset in preparation for the double running detection of the conveyed medium 6.

As the medium 6 is gradually conveyed,
The thickness detecting means 8 detects the thickness of the medium 6 to be conveyed,
Output to the integrating means 10. An example of the thickness of the medium (thickness detection signal) detected by the thickness detecting means 8 is shown in FIG. Further, in FIG. 10C, as the thickness of the medium 6 is detected thicker, the thickness detection signal c is in the “thick” direction of the arrow in the figure, and as it is thinner, it is “thin”.
Direction. The integrating means 10 integrates the thickness detection signal c of the medium 6 output by the thickness detecting means 8 and outputs an integration result f. The integration process is continued while the medium detection signal a is "1", and while the detection signal a is "0", the integration result f is reset and "0" is output.

The first reference value R1 in FIG. 10 is the lower limit of the integrated value of the thickness of one medium stored in the first reference value storage unit 13-1 and the second reference value. R2 represents the lower limit value of the integrated value of the thicknesses of the two media stored in the second reference value storage 13-2.

The comparing means 16-1 outputs the integration result f when the medium detection signal a changes from "1" to "0" as the first result.
Of the first reference value R1 stored in the reference value storage unit 13-1 and outputs the comparison result. H- in FIG.
1 shows the output of the comparison result. In FIG. 1 h-1,
When the integration result is equal to or larger than the first reference value R1, the signal of "1" is output, and when not, the signal of "0" is output.

The comparing means 16-2 also calculates the integration result f when the medium detection signal a changes from "1" to "0".
It compares with the second reference value R2 stored in the second reference value storage unit 13-2 and outputs the comparison result. The output of the comparison result is shown in h-2 of FIG. In FIG. 2H-2, a signal of "1" is output when the integration result is equal to or larger than the second reference value R2, and a signal of "0" is output otherwise. Similarly, the comparison means 16-n calculates the integration result f when the medium detection signal a changes from "1" to "0" as the nth time.
Of the reference value storage section 13-n, and outputs the comparison result. When the integration result is greater than or equal to the nth reference value Rn, the signal of "1" is output, and when not, the signal of "0" is output.

When one normal medium 6 such as the medium A is conveyed, the maximum value of the integration result f of the thickness detection signal c,
That is, when the integrated value of the thickness of one medium A is IA,
IA is greater than or equal to the first reference value R1 stored in the first reference value storage unit 13-1 and the second reference value storage unit 13-2.
Is smaller than the second reference value R2 stored in. Therefore, the output of the comparing means 16-1 becomes "1", and all the outputs of the comparing means 16-2 to 16-n become "0".

Similarly, if the values of the integration result f of the output signals c of the medium B and the medium C are IB and IC, respectively, both are the first reference value stored in the first reference value storage unit 13-1. A third reference value which is greater than or equal to the value R1 and greater than or equal to the second reference value R2 stored in the second reference value storage section 13-2 and which is stored in the third reference value storage section 13-3. Value R3
Will be smaller. Therefore, the output of the comparing means 16-1 and the output of the comparing means 16-2 are both "1", and all the outputs from the comparing means 16-3 to the comparing means 16-n are "0".

When the medium detection signal a changes from "1" to "0", the priority encoder 17 weights the outputs of the respective comparison means 16-1 to 16-n and converts them into numerical values. For example, in the case of medium A, the input is "1,
Since the output j is “0, 0, ..., 0”, in the case of the medium B and the medium C, the input is “1, 1,
Since 0, ..., 0 ”, its output j is“ 2 ”.
Then, based on the output j from the priority encoder 17, the double running determination means 15 does not perform double running when the value of the output j is "1", and when the value of the output j is "2", Judged to be double running.

Next, an example of the three-sheet overrun and the medium 6 to which a tape or the like is attached, which has been problematic in the prior art, will be described. FIG. 11 is a diagram for explaining the case of these media. In the figure, medium D and medium E are the same as the medium of FIG. Further, in the figure, the medium detection signal a, the thickness detection signal c, the integration result f, the comparison results h-1, h-2,
h-3 and encoder output j show output signals similar to those in FIG. 10, respectively.

First, the above-mentioned first to medium E from medium D
Similar to the operation of the embodiment, the integration result f is obtained for the medium D and the medium E. And this is respectively ID and IE
Then, ID is equal to or larger than the third reference value R3 stored in the third reference value storage unit 13-3, and is stored in the fourth reference value storage unit 13-4 (not shown). It is smaller than the reference value R4 of 4. Further, IE is equal to or larger than the first reference value R1 stored in the first reference value storage unit 13-1,
And the second stored in the second reference value storage unit 13-2.
Is smaller than the reference value R2 of.

Therefore, the respective inputs of the priority encoders 17 corresponding to the medium D and the medium E are "1,
0, "1, 0, 0, 0, ... 0". As a result, the outputs j of the priority encoder 17 become 3 and 1, respectively, and the accurate number of the conveyed media 6 can be detected.

In the second embodiment, the calculation means 14
Is composed of a plurality of comparing means 16-1 to 16-n and the priority encoder 17, but the present invention is not limited to this, and a certain value (integral result f in this embodiment) is set to a plurality of reference values. Other configurations may be used as long as they are compared with and the value is encoded.

Further, the medium 6 may be not only a banknote used in an automatic depositing / dispensing machine or the like, but also a paper sheet or the like used in a general document processing apparatus or the like. Has the same effect as.

[0053]

As described above, according to the overrun detection device of the first invention, the thickness of the medium to be conveyed is integrated, and the integration result and the preset thickness of one normal medium are integrated. Of the thickness of the medium to be conveyed and the normal value of the thickness of the medium to be conveyed, and the overrun determination is performed based on this ratio. The number of media is compared with the reference value for each number of sheets, and the number of mediums conveyed in an overlapped manner is calculated based on the comparison result. It is possible to accurately determine the number of running sheets, and it is possible to prevent erroneous determination in the case of a medium to which a tape or the like is attached.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of an overrun detection device of the present invention.

FIG. 2 is a block diagram of a conventional heavy running detection device.

FIG. 3 is an operation waveform diagram of each part in the conventional heavy running detection device.

FIG. 4 is an explanatory diagram of an example of a medium in a heavy running detection device of the related art and the present invention.

FIG. 5 is an operation waveform diagram of each part in another medium state in the conventional heavy running detection device.

FIG. 6 is an explanatory diagram of a medium example in another medium state in the conventional and the heavy running detection device of the present invention.

FIG. 7 is an operation waveform diagram of each part in the first embodiment of the overrun detection device of the present invention.

FIG. 8 is an operation waveform diagram of each part in the case of another medium state in the first embodiment of the overrun detection device of the present invention.

FIG. 9 is a block diagram of a second embodiment of the overrun detection device of the present invention.

FIG. 10 is an operation waveform diagram of each part in the second embodiment of the heavy running detection apparatus of the present invention.

FIG. 11 is an operation waveform diagram of each part in another medium state in the second embodiment of the overrun detection device of the present invention.

[Explanation of symbols]

 7 Medium Detecting Means 8 Thickness Detecting Means 9, 13 Reference Value Storage Means 10 Integrating Means 11, 14 Calculating Means 12, 15 Overrun Discriminating Means

Claims (2)

[Claims] 1. A medium detecting means for detecting the presence or absence of a medium to be conveyed, a thickness detecting means for detecting the thickness of the medium, and a thickness of the medium detected by the thickness detecting means, Integrating means for performing integration based on the transport length of the medium detected by the medium detecting means; reference value storing means for storing a preset reference value of the integrated amount of the thickness of one normal medium; A calculating means for obtaining a ratio between the integrated value of the thickness of the medium output by the means and the reference value; and a double running determining means for performing the double running determination of the medium based on the value obtained by the calculating means. A heavy running detection device characterized in that 2. A medium detecting means for detecting the presence / absence of a medium to be conveyed, a thickness detecting means for detecting the thickness of the medium, and a thickness of the medium detected by the thickness detecting means, Integrating means for integrating based on the transport length of the medium detected by the medium detecting means, and a reference for the preset integral amount for each number of sheets from the thickness of one normal medium to the thickness of a plurality of media A reference value storage means for storing a value, an integrated value of the thickness of the medium output by the integration means, and a plurality of reference values stored in the reference value storage means are compared, and the integrated values are respectively And a calculation means for calculating how many sheets of the medium are overlapped and conveyed based on the size relation, and the overrun determination of the medium is performed based on the value calculated by the calculation means. A heavy load characterized by having an overrun determination means. Sensing device.