JP2008215855A - Paper sheet handling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems wherein, in a device for conveying paper sheets by a conveyance means, measuring simultaneously a frictional characteristic of the paper sheets, and discriminating the state of the paper sheets, if a moisture content rate of the paper sheets is changed, the frictional characteristic of the paper sheets is also changed, and thereby the state of the paper sheets cannot be discriminated accurately by a fixed discrimination value, and even a normal bill is sometimes repayed. <P>SOLUTION: A contact type temperature/humidity sensor capable of responding at high speed with high accuracy is provided on an upstream part on the conveyance side of a roller pair. The moisture content rate of each paper sheet is detected instantly by being brought into contact with the paper sheet when conveying the paper sheets, and a frictional characteristic discrimination value is determined from a detected value, and compared with a measured value of a frictional force (or a friction coefficient), to thereby discriminate an abnormal bill from a normal bill. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a friction characteristic measuring apparatus that measures and selects friction characteristics such as a friction force and a friction coefficient of paper sheets.

  2. Description of the Related Art Conventionally, in an apparatus that feeds and conveys paper sheets, such as an automatic teller machine (ATM), for example, a conveying means such as a roller or a belt is brought into contact with the paper sheets, and the friction between the paper sheets and the conveying means. It is transported by feeding out paper sheets.

  However, the friction coefficient between the paper sheet and the conveying means, which is a coefficient for determining the frictional force applied to the paper sheet, varies depending on the state of the paper sheet, for example, the degree of wrinkles, the strength of the waist, and dirt. For this reason, even if the pressing force applied to the paper sheet by the conveying means is constant, depending on the state of the paper sheet, an error such as a jam (paper jam), skew, or deformation may occur.

  Therefore, conventionally, the state of the paper sheet is determined, and the friction characteristics such as the friction force and the friction coefficient of the paper sheet are detected. For example, banknotes having an extremely low friction coefficient are prevented from being returned to the apparatus, or are withdrawn as they are and returned to the user to carry out transport control such as elimination and avoidance of error causes. As described above, for example, a measurement method described in Japanese Patent Application Laid-Open No. 2003-315193 has been proposed as a method capable of instantaneously measuring the friction characteristics of a paper sheet while conveying paper sheets such as banknotes.

  In this measurement method, two pairs of rollers are provided before and after the sheet conveying direction, and different pressures are applied to each pair of rollers to provide different speed differences between the two pairs of rollers. It is driven to rotate. The load torque is measured from the slip generated between the paper pair of one roller pair, the friction coefficient of the paper sheet is calculated from the measured value, and the state of the paper sheet is determined. .

  Further, the apparatus described in Japanese Patent Application Laid-Open No. 2002-139392 includes means for measuring the temperature and humidity in the apparatus when the environmental temperature and humidity change. There has been proposed an apparatus for accurately detecting the texture of a paper sheet, which includes a CPU for adding and subtracting the measured value of the temperature and humidity as a correction value to the detected value of the texture of the paper sheet detected by the piezoelectric element. .

JP 2003-315193 A JP 2002-139392 A

  However, although the above-mentioned conventional technology takes into consideration the change in the frictional characteristics of the paper sheet when the environmental conditions such as the temperature and humidity in the surroundings and the apparatus are changed, for example, the paper sheet is left outdoors for a long time. If the moisture content of the paper sheet is left uncorrelated with the temperature and humidity in the device, or if the paper sheet is placed in a pocket for a long time, the moisture content of the paper sheet is the ambient temperature and humidity conditions No consideration is given to cases where it differs. Therefore, when correcting the discriminating value for determining the state of the paper sheet with the friction coefficient, there is a case where the correction of the water content of the actual paper sheet is performed and the determination of the state of the paper sheet is mistaken. There is a problem that an error occurs such that a paper sheet to be processed normally is returned to the user.

  An object of the present invention is to provide a paper sheet handling apparatus that can more accurately determine a paper sheet state even when the frictional characteristics of the paper sheet change due to changes in temperature and humidity, etc., and has high detection accuracy. It is in.

  An object of the present invention is a paper sheet handling apparatus for transporting paper sheets placed in a paper sheet storage space and storing them in a paper sheet storage, wherein the transport means and the transport means transport the paper sheets. And at least two roller pairs provided before and after the paper sheet in the conveying direction, an applying means for applying different pressing force to each roller, and each roller pair having a speed difference. The state of the paper sheet is determined based on the detection value and the detector that measures the frictional force or the rotational speed change of the paper sheet from the slip generated between the rotationally driven motor and one of the roller pair and the paper sheet. In a paper sheet handling apparatus having a paper sheet discriminating circuit for discriminating, a paper for setting a paper sheet discriminating value based on the detector for detecting the moisture content of each paper sheet on the conveying means and the detected value This is achieved by providing a leaf discrimination value setting circuit.

  The above-mentioned object is achieved by a detector that detects the water content of each paper sheet contacting the paper sheet.

  The above object is achieved by providing a small contact temperature / humidity sensor as a detector for detecting the moisture content of each paper sheet.

  The above object is also provided as a detector for detecting the water content of each paper sheet by providing a pair of roller pairs composed of a metal roller and a rubber roller. This is achieved by providing a circuit for detecting the above.

  Further, the above object is to provide a conductive brush sensor composed of a conductive brush as a detector for detecting the moisture content of each paper sheet, and to pass a current through the conductive brush sensor, its current value, resistance, etc. This is achieved by providing a circuit for detecting the above.

  According to the present invention, it becomes possible to correct the discrimination value for sorting abnormal banknotes and normal banknotes according to the moisture content of the paper sheets, and even when the friction characteristics of the paper sheets change due to changes in temperature and humidity, etc. The leaf state can be determined more accurately, and a paper sheet handling apparatus with high detection accuracy can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a paper sheet handling apparatus provided with an embodiment of the present invention.
In FIG. 1, a paper sheet handling apparatus 1 is used for a deposit system of a financial institution such as a bank. An input port 3 is provided on the operation panel surface provided on the front side of the metal housing 2. The insertion port 3 can be freely opened and closed by an automatic or manual slide lid 4. Inside the metallic casing 2 is provided a paper sheet accommodation space 6 for temporarily storing paper sheets 5 inserted from the insertion slot by the customer. A guide plate 7 having a predetermined inclination angle is disposed on the front side of the paper sheet storage space 6, and the guide plate 7 reciprocates between stoppers (not shown). A bill press plate 8 that can reciprocate in the horizontal direction along a guide rail (not shown) is disposed on the back side of the sheet storage space 6.

  When the slider lid 4 is closed after the paper sheets 5 are inserted and then the bill press plate 8 is further advanced with the bill press plate 8 sandwiching a predetermined number of paper sheets 5, the guide plate 7 is moved to a predetermined stopper position. It is a structure that moves forward.

  As shown in FIG. 1, the guide plate 7 is formed with a roller window 10 for exposing a part of the feeding roller 9. The feeding roller 9 rotates while making frictional contact with the surface of the paper sheet 5 in contact with the guide plate 7 among the paper sheets 5 sandwiched between the guide plate 7 and the bill press plate 8. Further, the sheets 5 are fed upward along the guide plate 7 one by one. A part of the peripheral surface of the feeding roller 9 protrudes from the roller window 10 into the paper sheet storage space and feeds the paper sheet 5 when the paper sheet is fed out, and has a friction portion on a part of the peripheral surface. It has a configuration.

FIG. 2 is a schematic configuration diagram showing the operation of the paper sheet handling apparatus provided with this embodiment.
In FIG. 2, the paper sheet handling apparatus 1 has a paper sheet transport path 11 for transporting the paper sheet 5 fed out from the paper sheet storage space 6. The paper sheet transport path 11 has a paper sheet inlet 12 that communicates with the paper sheet storage space 6 after the slide lid 4 is closed. Two pairs of paper sheets 5 and feed rollers 20 and 21 are arranged in the paper sheet transport path 11 in order to transport the paper sheets 5 to a temporary storage or a storage (not shown).

In the two pairs of feed rollers 20 and 21 shown above, the upstream feed roller 20 is provided with a detector 22 for measuring the rotational torque or the rotational speed change. The rotation speed of the roller 21 is set to be higher than that of the roller 20, the paper sheet 5 is pulled by the feed roller 21, and the feed roller 20 is frictionally rotated by the frictional force of the paper sheet 5. A coefficient of friction is detected.

  The measured value is input to the paper sheet discriminating circuit 31 shown in FIG. The paper sheet discriminating circuit 31 discriminates between an abnormal banknote and a normal banknote by comparing the measured value with a friction coefficient discriminating value corresponding to the moisture content of each paper sheet.

  The operation of the paper sheet handling apparatus 1 based on the configuration described above with reference to FIGS. 1 and 2 will be briefly described. As shown in FIG. 1, the customer first operates the panel, opens the slide lid 4, and deposits the paper sheet 5 into the paper sheet accommodation space 6. Thereafter, as shown in FIG. 2, the slide lid 4 is automatically closed.

  After the completion of the insertion of the paper sheet 5 is detected, the bill press plate 8 is advanced by a drive motor (not shown). Then, the bill press plate 8 further advances with the bill press plate 8 and the guide plate 7 sandwiching a predetermined number of sheets 5, and the guide plate 7 is advanced to a predetermined position and stopped. In this state, the paper sheet transport path 11 and the paper sheet accommodation space 6 communicate with each other through the paper sheet inlet 12. Thereafter, the feeding roller 9 and the feeding rollers 20 and 21 are interlocked.

  As shown in FIG. 2, after the driving of the feeding roller 9 starts, the paper sheet 5 in the paper sheet accommodation space 6 is moved upward toward the paper sheet introduction port 12 by the feeding roller 9 along the guide plate 7. Will be paid out. By the above operation, the paper sheets 5 are moved one by one from the paper sheet accommodation space 6 to the paper sheet conveyance path 11 through the paper sheet introduction port 12.

FIG. 3 shows a block diagram of the detector and circuit configuration of the present invention.
In FIG. 3, the paper sheet handling apparatus 1 of the present invention has a contact temperature / humidity sensor 15 having high accuracy and high speed response shown in FIG. Is provided. The contact-type temperature / humidity sensor 15 and the paper sheet 5 when the paper sheet is conveyed contact each other to instantaneously measure the moisture content of each paper sheet 5, and the measured value is set to the discrimination value shown in FIG. It is configured to input to the circuit 30. The discriminant value setting circuit 30 sets a friction coefficient discriminating value for discriminating between abnormal bills and normal bills based on the moisture content, and outputs it to the paper sheet discriminating circuit 31.

  Thereafter, each paper sheet 5 whose moisture content has been measured is transported to the feed rollers 20 and 21 through the paper sheet transport path 11, and rotational torque, rotational speed change, and the like are detected by the detector 22 as a frictional force ( Is converted into a coefficient of friction) and input to the paper sheet discrimination circuit 31. The paper sheet discriminating circuit 31 discriminates the state of the paper sheet based on the friction characteristic, outputs an instruction for selecting each paper sheet to the paper sheet selecting circuit 32, and the paper sheet is selected.

  Next, a method for detecting the dynamic friction coefficient of paper sheets using the feed rollers 20 and 21 will be described with reference to FIG.

FIG. 4 shows the two pairs of feed rollers 20 and 21 described above.
In FIG. 4, a detector 22 for measuring the rotational torque or rotational speed of the roller 20 is connected to the feed roller 20, and the amount of change due to the paper sheet being fed is detected instantaneously.

  Hereinafter, the operation will be described. First, the feed roller 20 is rotated at the speed ω1 by the first motor 23, and a predetermined contact load N is applied to the paper sheet 5 in the paper sheet transport path 11. The paper sheet 5 is fed out from the paper sheet accommodation space 6 shown in FIG. 1 and conveyed in the paper sheet conveyance path 11. When the paper sheet 5 reaches the feed roller 20, the feed roller 20 rotates freely and the paper sheet is fed. 5 is conveyed to the feed roller 21. The feed roller 21 is also free to rotate. The feed roller 21 is rotated at the speed ω2 by the second motor 24, and ω1 <ω2.

Here, if the frictional force between the paper sheet 5 and the feeding roller 21 is sufficiently larger than the frictional force between the paper sheet 5 and the feeding roller 20, the paper sheet 5 is accelerated by the feeding roller 21 and the paper sheet Friction force F is generated between 5 and the feed roller 20. This frictional force F is measured as a torque T applied to the friction roller or a change in the rotational speed. Using this torque T and a predetermined contact load N applied to the paper sheet 5 by the feed roller 20, the dynamic friction coefficient μ when the feed roller 20 is conveyed at a speed ω1 and the feed roller 21 is conveyed at a speed ω2 (ω2> ω1). _d is calculated.

  First, the torque T applied to the feed roller 20 is expressed by the following equation where the frictional force F and the radius r of the feed roller 20 are given.

T = r · F …………………………………………………………………………………… (1)
The frictional force F is calculated from the above equation. Calculate the dynamic friction coefficient μ _d from the following equation.

μ _d = F / N ………………………………………………………………………………………………………………………………………………………… (2)
As described above, the frictional force F (or the friction coefficient μ _d ) of the paper sheet 5 is detected based on the torque generated by the speed difference between the feed rollers 20 and 21, or the rotational speed, and the moisture content of each paper sheet is determined. An abnormal banknote and a normal banknote are discriminated based on the determined friction coefficient discrimination value.

Next, the discrimination value setting operation will be described in more detail based on the flowchart of FIG.
In FIG. 5, first, after the completion of the insertion of the paper sheet 5 into the paper sheet accommodation space 6 is detected, the bill press board 8 and the guide board 7 sandwich the predetermined number of paper sheets 5 in between. 8 further advances, and the guide plate 7 is advanced to a predetermined position and stopped. Thereafter, the paper sheet 5 in the paper sheet accommodation space 6 is fed upward toward the paper sheet inlet 12 by the feeding roller 9 along the guide plate 7.

  By this operation, the paper sheets 5 are moved one by one from the paper sheet accommodation space 6 to the paper sheet conveyance path 11 through the paper sheet introduction port 12. Thereafter, each paper sheet 5 moved to the paper sheet transport path 11 is contacted with a contact-type temperature / humidity sensor 15 that responds with high accuracy and high speed, and the moisture content of each paper sheet 5 is instantaneously measured. The value is input to the discriminant value setting circuit 30 in FIG.

The discriminant value setting circuit 30 sets a friction coefficient discriminating value for discriminating between abnormal bills and normal bills based on the moisture content. Thereafter, each paper sheet 5 whose moisture content has been measured is transported to the feed rollers 20 and 21 through the paper sheet transport path 11, and the friction force F ( Alternatively, the friction coefficient μ _d ) is detected and input to the paper sheet discrimination circuit 31. The paper sheet discriminating circuit 31 compares the measured value (friction coefficient μ _d ) with the friction coefficient discriminating value (friction coefficient μ ₀ ) corresponding to the moisture content of each paper sheet, whereby an abnormal banknote and a normal banknote are compared. Is determined. Based on the result, an instruction to sort each paper sheet is output to the paper sheet sorting circuit 32, and sorting is performed. That is, if μ ₀ ≦ μ _d, it is determined as a normal banknote and conveyed to a paper sheet storage (not shown).

On the other hand, if μ ₀ > μ _d, it is determined that the banknote is abnormal, and the process ends as a paper sheet temporary storage or refund.

FIG. 6 is a diagram showing an example of the contact-type temperature / humidity sensor 15 used in this embodiment.
In FIG. 6, a contact-type temperature / humidity sensor 15 used in the present invention is a single-chip type sensor module capable of measuring temperature / humidity, and includes a capacitive polymer sensing element 16 and a bandgap temperature sensor 17 for measuring humidity at the top. Equipped with on-chip A / D converter 18 and interface circuit 18, digital output can be obtained.

  By adopting such a configuration, low cost, high signal quality, and high-speed response can be obtained, and the influence of external noise can be minimized. By using the contact type temperature / humidity sensor 15 that is simple and capable of high-speed response, the moisture content of the paper sheet can be quickly measured on the paper sheet conveyance path 11.

  In another embodiment, as shown in FIG. 7, as a device for detecting the moisture content of the paper sheet, a pair of roller pairs in the upper part is a metal roller 25 and the lower part is a rubber roller 26. 11, a current is applied to the paper sheet by applying a voltage between the feed rollers 20 and 21, and the current value (or resistance value) is measured to convert the moisture content of the paper sheet. The configuration is as follows.

  The measured value is input to the discrimination value setting circuit 30, and a friction coefficient discrimination value for discriminating between abnormal bills and normal bills is set. After that, the measurement data of the frictional force (or friction coefficient) of the paper sheet 5 caused by the speed difference between the feed rollers 20 and 21 is detected by the detector 22, and the friction coefficient is determined according to the moisture content of each paper sheet. An abnormal banknote and a normal banknote are discriminated based on the value.

  In another embodiment, as shown in FIG. 8, as a device for detecting the moisture content of the paper sheet 5, a conductive brush sensor 27 is provided on the paper sheet conveyance path 11 of the paper sheet 5, A configuration in which a current value (or resistance value) flowing through the paper sheet is detected by applying a voltage thereto, and the moisture content of the paper sheet is converted based on the detected value and input to the discrimination value setting circuit 30. To do.

  The conductive brush sensor 27 shown in FIG. 8 includes a conductive brush 29 made by sewing conductive fibers on a pile on a conductive base 29 made of a conductive material such as aluminum as shown in FIG. It is configured to be fixed with a conductive adhesive. As the conductive fiber, it is conceivable to use conductive nylon by dispersing carbon particles in the rayon fiber, or conductive nylon.

  The leading end of the conductive brush sensor 27 protrudes into the paper sheet transport path 11, the constant current power source 35 is connected to the conductive brush sensor 27, and a current is supplied every time the paper sheet 5 is transported. Then, the moisture content of the paper sheet 5 is measured from the current value or resistance value, and the abnormal banknote and the normal banknote are discriminated based on the friction coefficient discrimination value corresponding to the moisture content of each paper sheet 5.

  Although not shown in the figure, when a current is passed through the paper sheet, be sure to install a static elimination brush, etc., to reduce the charge of the paper sheet by flowing the charge after measurement and to make it easier to store. To do.

  Further, the method for detecting the moisture content of the paper sheet by a contact sensor or the like is not limited to the above technique.

  As described above, according to the present invention, it is possible to change the discrimination value for sorting abnormal banknotes and normal banknotes according to the moisture content of the paper sheets, and even when the friction coefficient changes due to changes in temperature and humidity, etc. It is possible to more accurately determine the state of the paper, and to provide a paper sheet handling device with high detection accuracy.

It is a schematic block diagram which shows the initial state of the paper sheet handling apparatus which is embodiment of this invention. It is a schematic block diagram which shows operation | movement of the paper sheet handling apparatus which is embodiment of this invention. It is a block diagram explaining the detector and circuit structure of this invention. It is explanatory drawing explaining the measuring method of the slip of the paper sheet of the paper sheet handling apparatus of this invention. It is a flowchart explaining operation | movement of the paper sheet handling apparatus of this invention. It is explanatory drawing of the contact-type temperature-humidity sensor of the paper sheet handling apparatus of this invention. It is a schematic block diagram which shows the other Example of the paper sheet handling apparatus of this invention. It is a schematic block diagram which shows the other Example of the paper sheet handling apparatus of this invention. It is a block diagram which shows the structure of the conductive brush sensor of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper sheet handling apparatus 2 Metal housing 3 Slot 4 Cover lid 5 Paper sheet 6 Paper sheet accommodation space 7 Guide plate 8 Bill press plate 9 Feeding roller 10 Roller window 11 Paper sheet conveyance path 12 Paper sheet Inlet 15 Contact temperature / humidity sensor 20, 21 Feed roller 22 Detector 23 First motor 24 Second motor 25 Metal roller 26 Rubber roller 27 Brush sensor 30 Discrimination value setting circuit 31 Paper sheet discrimination circuit 32 Paper sheet sorting circuit

Claims (5)

A paper sheet handling device for transporting paper sheets placed in a paper sheet storage space and storing them in a paper sheet storage, installed in a transport means for transporting the paper sheets and the transport means, And at least two sets of roller pairs provided before and after the sheet conveying direction, an applying unit for applying different pressing forces to the rollers, and a motor for rotating the roller pairs with a difference in speed. And a paper sheet for determining the state of the paper sheet based on the detection value and a detector for measuring a frictional force or a rotational speed change of the paper sheet from a slip generated between one of the roller pair and the paper sheet In a paper sheet handling apparatus having a class discrimination circuit,
A paper sheet characterized in that a detector for detecting the moisture content of each paper sheet and a paper sheet discriminant value setting circuit for setting a paper sheet discriminant value based on the detected value are provided on the conveying means. Handling equipment. In the paper sheet handling apparatus according to claim 1,
A paper sheet handling apparatus, wherein a detector for detecting the moisture content of each paper sheet contacts the paper sheet. In the paper sheet handling apparatus according to any one of claims 1 and 2,
A paper sheet handling apparatus comprising a small contact temperature / humidity sensor as a detector for detecting the moisture content of each paper sheet. In the paper sheet handling apparatus according to any one of claims 1 and 2,
As a detector for detecting the moisture content of each paper sheet, there is provided a pair of roller pairs composed of a metal roller and a rubber roller, and a circuit for passing a current through the roller pair and detecting the current value, resistance, etc. A paper sheet handling apparatus characterized by being provided. In the paper sheet handling apparatus according to any one of claims 1 and 2,
As a detector for detecting the moisture content of each paper sheet, there is provided a conductive brush sensor composed of a conductive brush, a current is passed through the conductive brush sensor, and a circuit for detecting the current value, resistance, etc. A paper sheet handling apparatus characterized by being provided.

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