JPS6172391A - Sheet paper discriminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical field to which the invention pertains] The present invention relates to a banknote discriminating device used in automatic vending machines, etc., in which paper sheets are conveyed between a pair of opposing electrodes, and A paper sheet discriminating device that determines the state of paper sheets by detecting the capacitance of the paper sheet has a luxurious electrode structure that prevents paper sheets being conveyed between opposing electrodes from getting caught and stagnant.

[Prior art and its problems]

Conventional equipment for determining the status of paper sheets such as banknotes, such as the presence or absence of paper sheets, the stacking state, and the presence or absence of foreign objects attached, was initially used to mechanically detect paper sheets using needle-like probes. A method was adopted in which the thickness of the paper sheet was detected and a microswitch was driven by a needle, or a method was used in which light was projected onto the paper sheet and the amount of transmitted light was detected using a photoelectric element. Since this is a method of mechanically enlarging the thickness of paper sheets by bringing the tip of the probe into contact with the flea of the paper sheet, it is difficult to use paper sheets with multiple stacks of paper or paper sheets whose damaged parts have been repaired with cellophane tape. It is very difficult to adjust the mechanism to distinguish between a normal sheet and the vibration of the needle probe that occurs due to the presence of folds in the sheet. There is a problem that malfunctions in the discrimination operation are likely to occur due to vibrations of the transport mechanism that transports the paper, and the latter method also has the problem that it may be affected by external light and that foreign objects attached to the paper sheet 1c may be transparent. Since there are problems such as not being able to detect foreign objects when using tape, we have recently begun to deal with this problem.

A device that conveys paper sheets between two parallel plate-shaped detection electrodes provided in the rain detection electrode and detects the capacitance between the rain detection electrodes to determine the condition of the paper sheets has become common (special Gansho 58-573
9).

However, in such a capacitance detection method, in order to increase the detection sensitivity, it is necessary to make the gap between the detection electrodes as narrow as possible. There is a problem in that paper sheets easily get caught in the detection electrode and become stagnant.

[Purpose of the invention]

The present invention solves the problem of conventional paper sheet discriminating devices that employ the capacitance detection method as described above.
An object of the present invention is to provide a paper sheet discriminating device having an electrode structure in which a paper sheet transported between opposing detection electrodes does not get caught in the detection electrodes and become stagnant.

[Key points of the invention]

In order to achieve the above object, the present invention conveys a paper sheet between two detection electrodes provided oppositely, and detects the capacitance between the detection electrodes to detect the shape of the paper sheet. In the paper sheet discriminating device 1 that performs rabbit discrimination, the detection electrode is formed in a cylindrical or cylindrical shape. Even if the paper sheet comes into contact with the detection electrode when the paper sheet is moved, the detection electrode rotates, so that the paper sheet passes between the detection electrodes without becoming stagnant.

[Embodiments of the invention]

Figure 1 is a cut-away configuration diagram of the essential parts of the present invention.
1 is a conveyance path which is designed to convey the paper sheet 2 to be determined by a drive mechanism (not shown), and 3.4 is a pastry plate forming a part of the conveyance path 1; It is a board. Both the bottom plate 3 and the top plate 4 are fixed to a casing 5, which is not shown in the figure. Arrow P is the conveyance direction of the paper sheet 2, and the figure shows the conveyance path 1 being traversed along the arrow P direction IC. Reference numeral 6.7 denotes a lower detection electrode and an upper detection electrode, which are provided in the middle of the conveyance path 1 so as to face each other, and each detection electrode is formed into a cylindrical shape. Both 6a and 7a are mounted on the housing 5 so as to be perpendicular to the conveying direction P8 and the plane of the paper.
The detection electrodes 6 and 7 are connected to each other with a fixed shaft at the end of the IC.
The shafts 5a and 7a are supported by the radial support members 6b and 7b, and the detection electrodes 6 and 7 supported in this way are arranged so that they can freely rotate around the shafts 5a and 7a. It is composed of n. 8 is a gap formed between the electrodes 6 and 7, which is larger than the thickness of the paper sheet 2. Reference numeral 11 denotes an auxiliary electrode arranged to face electrode 6 with a gap 9 in between. The pole 12 is an auxiliary electrode Ic arranged so as to face the electrode 71 with a gap 10 in between.
．． 12 are each curved and formed into a rectangular shape so as to form a part of the cylindrical side surface, and 13 and 24 are auxiliary electrodes 1.
They are conductive wires that take out the potential from each of the 1.12 and 1.12. Reference numeral 15 denotes an insertion opening into which the paper sheets 2 are inserted (transfer path 1), and 16 refers to the transport path l]. A paper sheet discriminating device 17 is composed of the above-mentioned parts.

FIG. 2 is an equivalent circuit diagram showing the capacitance distribution between the conductive wires 13 and 14 in the gap 81ζ in FIG. Cx is the capacitance between electrodes 7 and CI is the capacitance between electrodes 7 and 7.
, 12 is 02, the combined electrostatic capacitance between the conductors 13 and 14, the capacitance C, is expressed as in equation (1) n, and the capacitance c, , c2' is the gap 9.10) The rust conductivity of the medium in the space is respectively nε1゜ε2) The area of the opposing electrodes forming the capacitances C, , C2 is S, , S2) the gap 9.
Each size of 10 is dInd! is approximately expressed as in equation (2). Here, , , and are constants of proportionality.

CI-(K+ε, 8.)/d+, (4=(K2
ε232)/d2...(2) The capacitance C,,C, is (
2) is expressed as 1, but in this case, d,, d, are small, and S 1 and S 2 are formed sharply, so C,, C, are both large, and as a result, -l@Equation (1) is transformed by one as shown in Equation (3).

C+ CX ...... (3) In other words, the capacitance CX changes depending on the presence or absence of paper sheets 2, the status of intussusception, and the state of foreign objects attached, and the capacitance Cx is clear from equation (3). The capacitance C between the conductor wires 13 and 14 can be detected by the capacitance C. Therefore, in the sheet discriminating device 171 shown in FIG. 1, the capacitance C is detected. As a result, by guiding each potential of the auxiliary electrodes 11.12 to a discriminating means such as an arithmetic circuit (not shown) through conductive wires 13.14, the paper sheets conveyed between the electrodes 6.7 are At this time, even if the paper sheet 2 that has entered the gap 8 collides with or comes in contact with the electrode 6.71, the stiff electrode 6.7 can freely move 1ζ
As it rotates, the paper sheet 2 is connected to the electrode 6.7I.
This does not mean that your progress will be hindered.

FIG. 3 is a cutaway configuration diagram of essential parts of another embodiment of the present invention, and the main difference from FIG. In this case, both the lower detection electrode 18 and the bottom plate 3 are fixed to the electrode mounting base 19 by means not shown.
, the bottom plate 3, the electrode 18, and the mounting base 19 constitute a planar bottom portion of the conveyance path 1. The conducting wire 13 is directly connected to the detection electrode 18+C in FIG. Since the discriminating device 20 is configured as described above, it is clear that the state of the paper sheet 2 is discriminated by detecting the capacitance between the conductors 13 and 14. When the paper sheet 2 enters the gap 8, not a single one of the detection electrodes 18 gets caught, and as a result, the conveyance of the paper sheet 2 does not become stagnant in the gap 8.

In the embodiments described above, the detection electrodes 6.7 are formed into a cylindrical shape, but it is clear that any of these electrodes may also be formed into a cylindrical shape, and the auxiliary electrode 11
．． It is also clear that the cross-sectional shape of 12 is not necessarily limited to the shape shown in FIGS. 1 and 3. Further, in the present invention, the detection electrodes 6 and 7 may be configured to rotate in the direction of the arrow shown in the figure in synchronization with the transport speed of the paper sheet 2 by an electric motor or the like. In such a case, the gap 9.10 is the electrode 6.
．． 7 may be filled with a material having a high dielectric constant by wrapping Teflon tape or the like.

Electrodes 6, 7H: When wrapped with Teflon tape, etc., the electrodes 6, 7 are rotated while the Teflon tape, etc. and the auxiliary electrodes 11° 12 slide, and in this case, as is clear from equation (2), there is no possibility of fleas. ,C,,C, are larger than when the gap 9.1° is filled with air, so the conductor 13.14
Errors in the detection of the capacitance Cx between the detection electrodes 6 and 7 or between the detection electrodes 18 and 18.7 are reduced through the capacitance C between them. When the detection electrode 6.7 is rotated by an electric motor, the potential from the stiff electrode is extracted from the auxiliary electrode 11.12.
It is also possible to take out the contact directly without using a contactor or the like. In the embodiment shown in FIG. 3, the potential of the lower detection electrode 1B is taken out directly by the conductor 13, but if necessary, the potential of the electrode 18 can be taken out using an auxiliary electrode in the same way as the potential of the upper detection electrode 7 is taken out. There is no problem in extracting the electric potential.

〔Effect of the invention〕

As described above, in the present invention+C'j6, one sheet of paper is expected to be detected between the two oppositely provided detection 'rLti,
Paper sheet discrimination technique 11 detects the silent beak between the detection electrodes and determines the condition of the paper sheet.In this paper sheet discrimination technique 11, at least one of the detection electrodes is moved in a direction perpendicular to the photographing and feeding direction of the paper sheet. It has a shaft and rotates once around the shaft to form a cylindrical or cylindrical shape, so that it is possible to detect paper sheets while transporting them. When the nuclear detection electrodes come into contact with each other, the rotation of one detection pole results in a paper sheet discriminating device that allows the paper sheets to pass between the detection electrodes without becoming stagnant. be.

[Brief explanation of the drawing]

Figures 1 and 3 are cut-away configuration diagrams of essential parts of the first and second embodiments of the present invention, and Figure 2 is an equivalent circuit diagram of the essential parts of Figure 1. . 1... Conveyance path, 2... Paper leaf% 6.
...Detection electrode, 6a...Axis, 7...
...Detection electrode, 7a...Axis, 11°12...
...Auxiliary lightning, pole, 17.20...Paper leaf condolence"
Man 1” device. Shi

Claims (1)

[Scope of Claims] 1) The paper sheet is conveyed between two detection electrodes provided opposite to each other on the conveyance path of the paper sheet, and the capacitance between the detection electrodes is detected to detect the paper sheet. In a paper sheet discrimination device that discriminates the state of leaves, at least one of the detection electrodes has an axis in a direction perpendicular to the conveyance direction of the paper sheets and is rotatable about the axis. A paper sheet discrimination device characterized by being formed into a cylindrical or columnar shape. 2) In the device according to claim 1, an auxiliary electrode is provided that forms a capacitance together with a detection electrode formed in a cylindrical or columnar shape, and the capacitance between the detection electrodes is reduced by the capacitance between the detection electrodes. A paper sheet discriminating device characterized by detecting paper sheets through a