JPH0193879A - Nature detector for sheet papers - Google Patents

Abstract

PURPOSE: To prevent mis-discrimination of a worn state of paper sheets by using a detection rotary body in contact with the paper sheet whose rotary amount changes depending on a friction so as to detect a property change caused by the difference from the friction coefficient. CONSTITUTION: When a paper money P to be carried is in contact with a detection rotating body 14, a torque in response to a friction caused through the contact is given to the detection rotating body 14. Then a rotary resistance provision means 18 provides a rotation resistance to the detection rotating body 14 to bring the detection rotating body 14 to be a prescribed halt state or in a rotating state driven at a different circumferential speed than the carrying speed of the paper money P when the torque is a prescribed value or below and to cause a change in a rotating amount of the detection rotating body 14 depending on the torque when the torque is a prescribed value or over. A rotary amount detection means 17 detects the change in the rotation amount to discriminate the property change.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is based on the magnitude of the friction coefficient and stiffness of paper sheets, which are the determining conditions for distinguishing between good and unfit banknotes. The present invention relates to a paper sheet property detection device that detects the properties of paper sheets.

(Prior Art) In the case of paper sheets, such as banknotes, it is necessary to collect the banknotes that have been worn out during the distribution process, as these days machines are used to count, identify, and process deposits and withdrawals.

Conventionally, as a device for obtaining discrimination conditions for determining the state of wear and tear of banknotes, Japanese Patent Laid-Open Nos. 61-168084 and 61-1 have been proposed.
There are those shown in each publication of No. 68085 and No. 61-169983.

The device disclosed in the above publication either generates sound by hitting an elastic body against the paper sheet, generates sound by rubbing the surface of the paper sheet, or uses a conveyance path that bends the paper sheet. This system generates sounds due to bending and deformation during conveyance, converts these sounds into electrical signals, and detects them.This electrical signal is used as a criterion for determining the state of wear and tear on paper sheets. It is something.

(Problem to be solved by the invention) However, with the above-mentioned conventional devices, it is very difficult to make a big splash of the generated sound, so it is necessary to make the part that picks up the sound completely soundproof, or to improve the mechanical structure of the device. There is a problem that the noise must be suppressed as much as possible, which increases the cost significantly.Also, even if the above conditions can be met, false detections are likely to occur due to the relationship with other sounds, resulting in The problem is that misclassification is likely to occur.

The present invention focuses on the fact that there is a difference in the coefficient of friction on the surface and the stiffness of the paper sheet itself between new paper sheets and paper sheets that are frequently used. A paper sheet property detection device that detects changes in properties due to differences in combination of coefficient and stiffness, and uses the detection results as a discrimination condition for determining the properties of paper sheets. This is what we are trying to provide.

[Structure of the invention]

(Means for Solving the Problems) From the above-mentioned viewpoint, in the first invention of the present application, the paper sheet is rotatably supported and conveyed, and the friction force generated by the contact is applied to the paper sheet. A detection rotary body is applied with a rotational force in the paper sheet conveying direction according to the force and changes the amount of rotation, and a rotational resistance is applied to the rotational force applied to the detection rotary body, and the rotational force is When the rotational force is below a predetermined value, the detection rotating body is held in a fixed stopped state or in a rotational state in which it rotates at a circumferential speed different from the conveyance speed of paper sheets, and when it is above a predetermined value, the detection rotating body is In the second aspect of the present invention, there is provided a rotational resistance applying means for causing a change in the amount of rotation of the rotating body, and a rotation amount detecting means for detecting a change in the amount of rotation of the rotating body for detection. In addition to the first invention, a driving rotary body that contacts the conveyed paper sheets and applies a conveying force is added, and the conveyed paper sheets are kept in contact between the driving rotary body and the detection rotary body. By allowing the paper sheet to enter the paper sheet, the paper sheet can enter smoothly and the properties of the paper sheet can be detected more accurately. By forming each circumferential surface of the rotary body to have concave and convex shapes facing each other in the width direction, and by deforming the conveyed paper sheet into a wave shape by contacting both of the concavo-convex circumferential surfaces, the stiffness of the paper sheet can be improved. The strength of the sheet acts as a normal force, which is a factor in the frictional force, so by detecting the frictional force, it is possible to detect the combination of the stiffness of the paper sheet and the size of the coefficient of friction.

In addition, "change in rotation amount" here means ■ change in rotation angle,
■Change in rotation speed, ■Change from rotation stop state to rotation state, ■Change from rotation state to rotation stop state. Change in speed reduction or reversal-stop →
(change to normal rotation), (2) change in rotational speed ((2) does not include the time element), etc.

(Function) In the first invention, when the conveyed paper sheet comes into contact with the detection rotating body, a rotational force corresponding to the frictional force is applied to the detection rotating body through the frictional force generated by the contact. At the same time, rotational resistance is applied to the sensing rotating body by the rotational resistance applying means, and when the rotational force is less than a predetermined value, the sensing rotating body is kept in a constant stopped state or the paper sheet conveyance speed is different. It is maintained in a rotational state rotating at a circumferential speed, and when the rotational force exceeds a predetermined value, the rotation amount of the detection rotating body is caused to change depending on the rotational force. Then, a change in the amount of rotation is detected by the amount of rotation detection means.

In the second invention, in addition to the effect of the first invention, a conveying force is applied to the paper sheet at a position where the driving rotation faces the detection rotating body, thereby smoothing the entry of the paper sheet.

In the third invention, in addition to the effect of the second invention, the stiffness of the paper sheet is reduced by deforming the paper sheet into a wave shape by the uneven peripheral surfaces of the driving rotary body and the detection rotary body. The strength of the force acts as a normal force, which is a factor of frictional force.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

1 to 3 show an embodiment of the first and second inventions of the present application, in which a conveying means for conveying banknotes P as an example of paper sheets is arranged between frames 1.1. Two upper belts 6.6 are wound between the pulleys 4.4 and 5.5 on the pulley shafts 2 and 3 which are pivotally supported, and a pulley shaft 7 which is also pivotally supported between the frames 1 and 1. Pulley 9 on top of 8
, 9゜1.0.10 Two strips of lower belt 1 wound between
1.degree. 11 are disposed vertically facing each other, and banknotes P are sandwiched between these upper and lower belts and conveyed in the direction of the arrow.

A drive rotor 12 is fixed to the axial center of the pulley shaft 2 of the upper belt 6.6, and a detection rotor 14 is mounted on a shaft 13 directly below the pulley shaft 2, facing the drive rotor 12. A predetermined gap smaller than the thickness of the banknote P to be handled is provided between the circumferential surfaces of both rotating bodies 12 and 14.

At the shaft ends of the pulley shafts 2 and 7, there is a pulley 15.1 which receives rotation from a motor (not shown) via a belt.
6 is fixed.

A rotation amount detection means 17 is provided at one end of the shaft 13 of the detection rotating body 14, and a rotation resistance imparting means 18 is provided at the other end.

A rotary encoder 19 is used as the rotation amount detection means 17 in the illustrated embodiment, and this encoder 19 is attached to the frame 1 via a mounting seat 2o, and this encoder 19 and the shaft 13 are connected to the end of the shaft 13. They are connected by a connecting member 21 fixed to. Therefore, by transmitting the rotational change of the detection rotating body 14 to the encoder 19 through the shaft 13, it is possible to detect a change in the amount of rotation.

Further, as shown in the second diagram, the signal from the encoder 19 is inputted to a property determining means, and the property is determined.

The rotational resistance imparting means 18 includes a receiving plate 22 fitted near the end of the shaft 13, a movable member 24 non-rotatably fitted to the coaxial shaft 13 via a key 23 and movable in the axial direction, and a movable member 24 that is movable in the axial direction. 13; a spring receiver 25 fixed to the end of the spring receiver 25; a compression spring 26 interposed between the spring receiver 25 and the movable member 24 to press the movable member 24 with a predetermined force;
The movable member 24 is pressed against the brake plate 28 by the force of the compression spring 26, and the movable member 24 is attached to the shaft 13 at a predetermined position. Frictional resistance is provided. The brake plate 28 is loosely fitted into the mounting bin 27 through a long hole, so that it absorbs and alleviates the shock when the banknote P is placed between the driving rotary body 12 and the detection rotary body 14. ing.

In the figure, reference numerals 29 and 30 denote a light emitting sensor and a light receiving sensor attached to the frame 1. When a banknote P passes, the optical path is cut off, and the passage of the banknote P is detected and the number of passing banknotes P is counted. It is also used to determine the timing for taking signals from the rotary encoder 19.

In the first invention, the driving rotary body 12 may be a roller or a guide plate that is not rotationally driven, or may be nothing.

Next, the effect will be explained.

The bill P is conveyed between the upper and lower belts 6 and 11 serving as conveyance means, and the leading end in the conveyance direction thereof is held between the drive rotary body 12 and the detection rotary body 14 and conveyed.

If the banknote P has a large coefficient of friction on the surface, such as a new banknote or something similar, the detection rotor 14 will experience rotational resistance due to friction when being conveyed between the drive rotor 12 and the detection rotor 14. The shaft 13 rotates by frictionally rotating by overcoming the rotational resistance by the applying means 18. This change in the amount of rotation of the shaft 13 is transmitted to the low-return encoder 19 through the connecting member 21, and based on the signal from the encoder 19, the banknote is determined to be a normal banknote by the property determining means.

When the banknote P is fatigued, the coefficient of friction on its surface is small, so even if it enters between the drive rotor 12 and the detection rotor 14, it is sent without much resistance, so the detection rotor 14 cannot overcome the rotational resistance by the rotational resistance imparting means 18 and is not rotated. Alternatively, even if the note barely overcomes the rotational resistance and is rotated, the change in the amount of rotation is small, and as a result, it is determined to be an unfit note.

FIG. 4 shows another embodiment of the first and second inventions of the present application.

In this embodiment, in order to apply rotation to the detection rotating body 14 at a circumferential speed different from the conveying speed of the banknote P, a brake plate 28 of the rotational resistance imparting means 18 is replaced by a brake plate fitted on the shaft 13 so as to be freely rotatable. A pulley 31 is disposed, and the side surfaces of the pulley 31 are arranged so as to be able to press against a receiving plate 22 fixed to the shaft 13 and a movable member 24 movable in the axial direction to the shaft 13, respectively, so that the pressing force of the compression spring 26 is applied. The rotational force transmitted to the pulley 31 by the shaft 13 through the receiving plate 22 and the movable member 24
The detection rotating body 14 is rotated.

Therefore, while the bill P does not enter, the detection rotating body 14 is rotated at a predetermined circumferential speed, and the detection rotating body 14 is rotated at a predetermined peripheral speed.
When a banknote P enters between the drive rotary body 12 and the friction coefficient of the surface of the banknote P is large, the detection rotary body 14
If the circumferential speed is set higher than the conveyance speed of the banknote P, it will be decelerated, and if it is set lower, it will rotate at an increased speed.One rotary encoder detects the change in the amount of rotation, and the property determining means detects the change in the rotation amount. It is determined that the banknote is normal.

If the friction coefficient of the surface of the incoming banknote P is small, the rotation of the detection rotating body 14 will not change, or even if it changes, it will be a small change, so the change in the amount of rotation will be small, and as a result, it will be determined that the banknote is a damaged note. It will be judged.

FIG. 5 shows an embodiment of the third invention of the present application. In this invention, in addition to the difference in the coefficient of friction of the banknotes P, the stiffness of the banknote P is also taken into account, and both of these factors are used to improve circulation. It is determined whether the banknote is inappropriate or not.

A plurality of concave and convex portions 32 and 33 are formed in the width direction of the peripheral surface of the driving rotary body 12 and the detection rotary body 14, and these concave portions 32
a, 33a and convex portions 32b, 33b are arranged to face each other with a predetermined gap therebetween. This uneven portion 32.
33 may have a rectangular groove shape as shown in the fifth figure, or may have a corrugated cross section as shown in the sixth figure. Since the other configurations are the same as those shown in FIG. 4, their explanation will be omitted.

Next, the effect will be explained.

When the banknote P enters between the driving rotary body 12 and the detection rotary body 14, the banknote P is deformed into a wave shape by the uneven portions 32 and 33 of the drive rotary body 12 and the detection rotary body 14, and is sent.

When the banknote P is a new banknote, since the banknote P has a strong stiffness, the restoring force that tries to return to the original state is strong, and this acts on the detection rotating body 14 as a large vertical force. Furthermore, since the friction coefficient of the surface is large, the rotational force due to friction becomes very large, and the detection rotating body 14 is accelerated or decelerated by the bill P, and the amount of rotation changes greatly. (At this time, the detection rotating body 14
The rotational force applied to is not limited to positive rotational force, and negative rotational force may also be applied. For example, when the detection rotary body 1° 4 is rotated at a circumferential speed faster than the conveyance speed of banknotes, a negative rotational force is applied in the conveyance direction by the banknotes being conveyed. ) The rotary encoder 19 detects the change in the amount of rotation, and the property determining means determines that the banknote is normal. If the incoming banknote P is worn out, its elasticity is weak, so the restoring force to return to its original state is weak (it does not act much as a normal force on the detection rotating body 14. Because the coefficient of friction is small,
The rotational force due to frictional force becomes very small.

As a result, the rotation of the detection rotating body 14 does not change, or even if it does change, it is a small change and the amount of rotation hardly changes. Therefore, it is determined that the note is unfit.

In addition, by applying the drive rotating body 12 shown in FIG. 5 to the paper sheet property detection device having the configuration shown in FIGS. 1 and 2, it is possible to detect both the friction coefficient and stiffness of the surface of paper sheets. Of course, it is possible to do so.

In the above judgment, the properties of the paper sheet include the degree of fatigue of the paper sheet, local abnormal thickness such as pasting with tape, folds, etc.
These combinations are collectively called. The device of the present invention can be applied to each of the detection purposes, that is, only detecting fatigue level, only detecting abnormal thickness, only detecting folds, and even detecting a combination of these. The property determining means p may adopt a detection form according to its detection purpose. In addition, depending on the detection purpose, both signals from other well-known property detection devices and signals from the bag and device of the present invention are inputted to the property determination means, and a detection form suitable for the above-mentioned purpose is determined. Just do it.

On the other hand, although the driving rotary body 12 and the detection rotary body 14 are both shown as having a roller structure in the illustrated embodiment, they may have a belt structure. The configurations of other parts are not limited to the embodiments, and design changes may be made arbitrarily without departing from the technical idea of the present invention.

〔Effect of the invention〕

As explained above, in order to detect the properties of paper sheets, the present invention extracts the difference in the coefficient of friction on the surface of paper sheets as a change in the amount of rotation of a rotating body for detection, and calculates the change in the amount of rotation. Detection is performed using a detection means, and the detection results are used to determine the properties of paper sheets,
In other words, since it is used as a discrimination condition for determining fitness or failure, it is possible to accurately detect the property regardless of the installation situation of the device. As a result, it becomes possible to provide a low-cost and high-probability correct/unfit bill discriminating device. Furthermore, as in the second invention, if the driving rotor that applies a conveyance force to the paper sheets is installed opposite to the detection rotor, the paper sheets can enter smoothly and prevent paper sheets from getting stuck and jamming. Furthermore, according to the third invention, since the properties of the paper sheet are detected based on both the coefficient of friction and the stiffness of the surface of the paper sheet, the detection accuracy can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the basic configuration of the present invention, FIG. 2 is a sectional view along the line ■-■ in FIG. 1, FIG. 3 is a side view of the conveying means in FIG. 1, and FIG. FIG. 5 is a view equivalent to FIG. 2 showing an embodiment of the invention, FIG. 5 is a view equivalent to FIG. 2 showing an embodiment of the third invention, and FIG. FIG. 12... Drive rotary body, 14... Detection rotary body, 17
...Rotation amount detection means, 18...Rotation resistance imparting means. Applicant's agent Mr. Sato Figure 2 Figure 1 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. Rotatably supported and in contact with the paper sheets being conveyed, and through the frictional force generated by the contact, a rotational force in the paper sheet conveyance direction corresponding to the frictional force is applied. Rotational resistance is applied to the rotating body for detection and the rotational force applied to the rotating body for detection, and when the rotational force is less than a predetermined value, the rotating body for detection is kept in a certain stopped state or the paper sheet is stopped. a rotational resistance imparting means that maintains the rotational state in which it rotates at a circumferential speed different from the conveyance speed, and causes the rotational amount of the detection rotational body to change in accordance with the rotational force when the rotational force exceeds a predetermined value; a rotation amount detection means for detecting a change in the rotation amount of the paper sheet, and the detection result of the rotation amount detection means is used as a condition for determining the properties of the paper sheet. property detection device. 2. A rotary drive body that contacts the paper sheets to be transported and applies a transport force, and a rotary device that is rotatable with a predetermined gap between the drive rotor and the paper sheets that are in contact with each other. A detection rotating body that is placed oppositely and is provided with a rotational force in the paper sheet transport direction corresponding to the frictional force generated by the contact of the paper sheets being conveyed, and a rotating force applied to the detection rotation body. When the rotational force is less than a predetermined value, the detection rotating body is placed in a fixed stopped state or in a rotating state in which it rotates at a circumferential speed different from the conveyance speed of paper sheets. rotational resistance imparting means for holding the rotational force and causing a change in the amount of rotation of the rotational body for detection in accordance with the rotational force when the rotational force exceeds a predetermined value; and rotational amount detection means for detecting a change in the amount of rotation of the rotational body for detection; What is claimed is: 1. A paper sheet property detecting device comprising: a detection result of the rotation amount detecting means is used as a condition for determining the property of the paper sheet. 3. A driving rotor whose circumferential surface is uneven in the width direction and which applies a conveying force by contacting the paper sheets to be conveyed, and an uneven circumferential surface opposite to the uneven circumferential surface of the drive rotary body. The paper sheet is rotatably arranged opposite to the driving rotary body with a predetermined gap therebetween so that the paper sheet being conveyed comes into contact with both uneven circumferential surfaces and is deformed into a wave shape. A detection rotating body that applies a rotational force in the sheet conveying direction according to the frictional force generated by contact with the leaves, and a rotational resistance to the rotational force applied to this detection rotating body. is applied, and when the rotational force is below a predetermined value, the detection rotating body is held in a fixed stopped state or in a rotational state in which it rotates at a circumferential speed different from the conveyance speed of paper sheets, and when the rotational force is above a predetermined value, The rotation resistance imparting means causes a change in the rotation amount of the detection rotor according to the rotational force, and the rotation amount detection means detects a change in the rotation amount of the detection rotor, and the rotation amount A paper sheet property detection device characterized in that the detection result of the detection means is used as a condition for determining the paper sheet property.