JPS60188252A - Device for detecting two paper overlap - Google Patents

Abstract

PURPOSE:To make it possible to detect an overlap of two papers among papers of several kinds with use of a single photosensor, by setting threshold values of the amount of transmission light, classified by the kinds of papers so that the overlap of two papers which are transferred are detected with the use of a threshold value appropriate to the kind of the associated papers. CONSTITUTION:In the case of application to a banknote pay-out device, before the start of a banknote feed-out device in which a predetermined kind of banknotes are stored, a reference value for judging an overlap of two papers of banknotes is read out from a memory 27 and is delivered as a two-paper-overlap reference voltage V2 to a comparator 23. Then, the feed-out device of the banknotes is initiated, and judgement on the output of the comparator 23 is initiated in accordance with an H signal which is delivered from a comparator 21 when the output of a light receiving unit 4a in an optical type two-paper overlap detector 4 which is amplified by an amplifier 20 lowers below a predetermined value. Further, when the level of the output of the comparator 23 is high, the overlap of two banknotes is determined, and therefore, a distributing flapper is driven in accordance with the result of the determination to retrieve the banknotes into a retrieving box.

Description

Detailed Description of the Invention (AlTechnical Field) This invention relates to a paper sheet double-ply detection device that checks double-ply paper sheets while conveying them, and in particular, to a double-ply detection device for checking multiple types of paper sheets with a single optical sensor. The present invention relates to a detection device capable of

(bl Conventional technology and its disadvantages In banknote counting machines, etc., it is necessary to check for double stacking of banknotes, so a double stack detection device is used. Conventionally, as a double stack detection device, the detection method is based on a mechanical structure. However, the former type of device cannot be applied unless all the thicknesses are the same, and when checking banknotes of different thicknesses, the same method is used only for different thicknesses. In addition, with the latter optical method, the checking process is complicated because it checks for double stacking using the transmission pattern of the light that passes through the banknote. Even if it depends on the method, the printed pattern,
It is difficult to accurately check multiple banknotes with different amounts of transmitted light, and as with the mechanical method described above, it is necessary to add a detection unit for each paper type. was there.

As mentioned above, when detecting double stacking of multiple types of paper sheets, conventional double stack detection devices require a detection section for each type, which has the problem of increasing the size of the device and increasing costs ( C1 Purpose of the Invention The purpose of the present invention is to solve the above-mentioned conventional problems, to set a threshold value for the amount of transmitted light for each type of paper sheet, and to set a threshold value according to the type of paper sheet being conveyed. By checking for double stacking, it is possible to check for double stacking with - number of optical sensors for paper sheets with different printing patterns, thicknesses, paper qualities, etc., making it possible to reduce the size and price of paper sheets. The object of the present invention is to provide a double-layer stack detection device of the same type.

(d) Structure and effect of the invention In order to achieve the -1-2 objective, the present invention includes one optical sensor that irradiates light onto gjL leaves and detects the amount of transmitted light, and integrates the output of the optical sensor. an integrating means; a double-overlap determining means for determining whether or not two sheets are stacked by comparing the magnitude of the integral value of the integrating means with a threshold value for the paper sheets being conveyed; and a check timing generation means for generating a judgment timing for the double-layer judgment means from the output of the optical sensor. shall be.

According to this invention, double stacking is detected by comparing and checking the amount of transmitted light using a threshold value set according to the type of paper sheets being conveyed. can be accurately and stably checked with one optical sensor, and as a result, such a highly versatile double-layer detection device can be constructed in a small size and at a low cost.

fe) Embodiment FIG. 1 is a paper which is an embodiment of this invention. 19 is a schematic configuration diagram of a two-sheet stack detection device.

The banknote dispensing devices 1 to 3 each store banknotes of different denominations, and have a built-in dispensing mechanism for dispensing the stored banknotes. The double stack detector 4 is composed of a light receiver 4a and a light emitter 4b, and emits light onto the banknotes fed out from each banknote feeding device, and detects the amount of transmitted light. The banknotes fed out from the banknote feeding devices 1 to 3 are transferred to a conveyance path 9, respectively.
~ 11, a single-branch feed path 12 equipped with a double-layer detector 4
transported to. The banknotes that have passed the double stack detector 4 are guided to a conveyance path 13 or 14. Sorting flapper 5 is t
Ilt feed route 12 to I! The banknotes are sorted by switching the general route to 1, 13 or 14. The banknotes 8a that are determined to be normal banknotes that are not double stacked are discharged to the discharge port 6 via the conveyance path 13. The banknote 8b determined to be double stacked is Il
It is collected into the collection box 7 via the transport path 14.

FIG. 2 shows a schematic configuration of the control section. The light emitted from the light projector 4b passes through the bill and is received by the light receiver 4a. The transmitted light is converted into an electrical signal via the light receiver 4a and amplified by the amplifier 20. Output 3 of amplifier 20
0 is led to a comparator 21 and an integrator 22. The integrator 22 integrates this output 30, and the output 32 of the integrator 22 is led to a comparator 23 for determining whether two sheets are overlapped. The comparator 21 compares the preset bill passage detection reference value with the output 3 of the amplifier 20.
Compare with 0. The comparator 23 compares the output 32 of the integrator 22 with a double-ply determination reference value (threshold value) set for each denomination of banknotes. This reference value is a value slightly larger than the integral value of the integrator 22 measured when exactly one bill of each denomination is passed through the double stack detector 4. The outputs 31,34 of these comparators are routed to the CPU 26 via the I10 port 25. The CPU 26 controls the bill dispensing processes of the bill dispensing devices 1 to 3 and the double stack check process for each denomination of bills. The memory 27 includes a CPU
An area is provided for storing a control program based on 26 and double-bill determination reference value data set for each denomination. The banknote feeding devices 1 to 3 are connected to the CI via the I10 boat 36.
) Connected to U26.

The detection principle of the above-mentioned double-layer detection device will be explained with reference to the waveform diagram shown in FIG. FIG. 3 (Δ) shows the output waveform of the amplifier 20. The solid line in the figure shows the case where one sheet of paper 711 is being conveyed, and the broken line shows the case where two sheets are being conveyed in stacks. A reference voltage v1 (see FIG. 3(A)) is set in the comparator 21 as the bill passage detection reference value. iJr when two banknotes are stacked on the detector 4! When the voltage starts to decrease, the amount of light received by the photoreceiver 4a decreases, and the output of the amplifier 20 decreases to V.
It becomes smaller than l. The output of the comparator 21 becomes high when the output of the amplifier 2o becomes lower than V1 (the third
1al(n)). The output of the comparator 21 becomes high during the time '1'0 from the time T1 when the output of the amplifier 2o becomes less than V1 to the time T2 when the output exceeds Vl again.

The output of the comparator 21 changes from high to low at the point '2'
is the point at which the paper 9 () has passed, and at this point, the comparator 23
Find the timing to compare and check the two sheets.

FIG. 3(C) shows the output waveform of the integrator 22. The solid line and the broken line in the same figure correspond to the output waveform of the solid line and the broken line in FIG. 3(A), respectively. Before feeding out the banknotes, the CPU 26 passes the banknotes through the I10 port 25 and outputs the double-bill judgment reference value stored in the memory 27 as a digital value 35 to the D/A converter 24, depending on the type of banknote to be fed out. The output 33 of the D/A converter 24 is led to one input of the comparator 23. As shown in FIG. 3(C), a double stack determination reference value set corresponding to the denomination of the banknote to be checked is set in the comparator 23 as a double stack reference voltage v2. Since there is a difference in the amount of transmitted light when one sheet is fed out and when two sheets are fed out in a stack, these differences appear as a difference in the integral value of the integrator 22, as shown in FIG. 3(C). Zunawara,
When two sheets are transported in layers, the passing end point T2
From time T3, just before , the output of the integrator 22 exceeds 2. Then, from when the output of the integrator 22 exceeds ■2,
The output of the comparator 23 becomes high (FIG. 3(D)). In this way, when two sheets are stacked, the output of the comparator 23 changes from low to high.
Each time the output of the comparator 23 is determined in step 2, it is possible to determine whether or not two sheets are overlapped.

Next, the specific operation of the two-sheet stacking check process by the -2 double-sheet stacking detection device will be explained with reference to flowcharts 1 to 4 in FIG.

First, in step nl (hereinafter, step n) is simply referred to as 01, the number of bills to be dispensed from each bill dispensing device is set. Each feeding device sequentially feeds out a set number of banknotes, and adds 31 to the number of 6 sheets of paper 1.
When dispensing banknotes of the denominations stored in the 1i9 dispensing device 1, processes n2 to n8 are performed. For the denomination of the banknotes stored in the bill dispensing device 1, the double stack determination reference value ζ stored in advance in the memory 27 is read out and set in the comparator 23 as the double stack reference voltage 2 (n3). After setting the threshold value for double stack determination using the reference voltage V2, the feeding device 1
The banknote feeding starts (n4). Subsequently, as explained with reference to FIG. 3, it is detected that the output of the comparator 21 changes from high to low, and the timing for checking the double stacking is created (n5). At the timing created through this comparator 21, the output of the comparator 23 is determined and a two-sheet overlap check is performed (n6). That is, as shown in FIG. 3(D), the time T when the banknotes have finished passing through the double stack detector 4
At step 2, it is determined whether the output of the comparator 23 is high or not, and when it is high, it is determined that the banknote is a double stack of banknotes, and the banknote is collected in the collection box 7 (n6, n7). On the other hand, when the output of the comparator 23 is low, it is determined that one bill is fed out, and the bill is discharged into the discharge port 6. The above double stack check is performed on the number of bills to be dispensed (n5 to n8).

Next, when the bill is fed out from the bill feeding device 2 and checked for double stacking, the process proceeds to n2-n9-nIo. At nlO, the double stack judgment reference value stored in the memory 27 for the denomination of the banknote stored in the banknote feeding device 2 is set in the comparator 23 as the reference voltage 2. After setting the threshold value for determining the double stack, the banknotes fed out from the bill payout device 2 are checked at times n5 to n8, as in the case described above. Also, when checking for double stacking by feeding out bills from the feeding device 3 (n 12), the comparator uses the double stacking judgment reference value stored for the denomination of WjL banknotes stored in the device as a threshold value. Set it to 23, start dispensing the ilL bill, and check for double stacking (n1
3. n14).

As described above, by setting the double-ply judgment standard value in the comparator 23 according to the denomination of the banknotes stored in each feeding device, the double-ply detector 4 of -111,1 detects the double-ply paper stack for multiple types of banknotes. Check accurately
Moreover, it can be performed stably. In addition, when changing the banknotes to be dispensed, just change the settings in the memory 27 without changing the configuration of the device. The double sheet overlap determination reference value setting area of the memory 27 corresponds to the threshold value setting means of the present invention, and n6 and the comparator 23 correspond to the double sheet overlap determination means of the present invention.Furthermore, n5 and the comparator 21
corresponds to the check timing generating means of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram of a two-sheet overlapping detection device that is an embodiment of the present invention, Fig. 2 is a schematic block diagram of the same two-sheet overlapping detection device, and Figures 3 (A) to (D) are two-sheet overlapping detection by the same two-sheet overlapping detection device. FIG. 4 is a waveform diagram for explaining the principle of this, and FIG. 4 is a flowchart showing the specific operation of the two-sheet overlap check process by the same two-sheet overlap detection device. 4-Dual stacked detector (optical sensor),

Claims (1)

[Claims] +11 A device for checking double stacking while conveying paper sheets, comprising: one optical sensor that irradiates light onto the paper sheets and detects the amount of transmitted light; and an integral that integrates the output of the optical sensor. means for determining the presence or absence of double stacking of paper sheets by comparing the magnitude of the integral value of the integrating means with a threshold value for the paper sheets being transported; a threshold setting means for setting a threshold according to the type of paper sheets; and a check timing generation means for generating a judgment timing by the double-sheet judgment means from the output of the optical sensor. Detection device.