JPH02249837A - Skew detector for paper sheets - Google Patents

Abstract

PURPOSE:To keep off any misjudgment on a skew occurrence attributed to bending at each tip angular part of paper sheets being conveying and a skew mode by setting a detected part of the paper sheets subject to detection by a sensor group to more than two spots. CONSTITUTION:In this detector, there is provided a control part which judges width of paper sheets, skew existence and the degree on the basis of a group of sensors 15-18 extending inward each from each specified position of both side edges in the cross direction of a conveying route 10 for paper sheets and the number of these sensors 15-18 covered by the paper sheets 20 passing through these sensors 15-18. A detected part of the paper sheets 20 subject to detection by these sensor groups 15-18 is set to more than two spots. The number of detecting elements covered at two spots in front and in the rear is checked and thereby discrimination between skewing and shifting is easily realizable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a skew detection device for paper sheets that can accurately detect when paper sheets such as banknotes are skewed during the transportation process.

(Prior art) In devices equipped with a mechanism for automatically accepting and dispensing paper sheets such as banknotes and tickets, such as two-car vending machines, ticket vending machines, and cash dispensing machines, paper It is highly necessary to detect the presence or absence of skew because the occurrence of skew during the transportation process of leaves causes erroneous identification in denomination, authenticity, etc. identification devices.

FIG. 3 is a schematic configuration explanatory diagram of a skew detection device provided in a banknote conveyance mechanism. Optical detection element groups 5 and 6 for detecting the passage of paper sheets are arranged to protrude inward, respectively. Each of the optical detection element groups 5 and 6 has a configuration in which the same number of elements are arranged in a line, and each element is composed of a pair of light emitting and light receiving elements. When one paper sheet blocks the light emitted from the light emitting element or the light received by the light receiving element, each element individually outputs a detection signal to a control section (not shown).

In the above configuration, when a paper sheet 1, for example, a banknote 1, conveyed in the direction of the arrow is skewed to the left as shown in the figure, the right corner of the leading edge of the banknote first hits the sensor group 6 on the right side. reached, followed by T.

The left corner of the tip reaches the left sensor 5 with a delay of time. Therefore, there is a lag in the timing at which each sensor group 5, 6 outputs a detection signal to the control unit, and the control unit can know the occurrence of skew based on the lag in the output timing of each signal.

The identification device prepares various identification patterns for determining denominations and authenticity according to various conditions such as skew direction and inclination angle. Identification is possible.

However, as shown in FIG.
, 6 at the same time, the control unit misjudges skew, and furthermore, when a sheet with one corner of the leading edge bent is conveyed in a skewed state, as shown in fbl of the same figure, Erroneous detection of the skew aspect (tilt angle) occurs. All of these causes erroneous identification.

(Objective of the Invention) The present invention has been made in view of the above, and it is possible to prevent the occurrence of skew due to the bending of the tip corner of conveyed filter paper sheets, and to prevent misjudgment regarding the form of skew, and to correctly identify the paper sheets. The purpose of the present invention is to provide a paper sheet skew detection device that enables the following.

(Summary of the invention) In a device for identifying the type, authenticity, etc. of paper sheets during the process of transporting the paper sheets, the identification device is configured to detect the type of paper sheets, the authenticity, etc. a group of sensors extending toward the sensor group; and a III control unit that determines the width of the paper sheet, the presence or absence of skew, and the degree thereof based on the number of sensors that are blocked by the sheet passing through the sensor group; The paper sheet is characterized in that the number of detected parts of the paper sheet to be detected by the group is two or more.

Further, the present invention is characterized in that the first detected part of the paper sheet to be detected by the sensor group is a predetermined distance behind the tip of the paper sheet.

Furthermore, the last detected part of the paper sheet to be detected by the sensor group is a predetermined distance ahead of the rearmost end of one paper sheet.

(Example) Hereinafter, five paper sheet skew detection apparatuses of the present invention will be described in detail based on examples shown in the accompanying drawings.

FIG. 1 is a schematic structural explanatory diagram of a first embodiment showing the principle of the present invention, in which first to fourth sensor groups +5.16°17.18 are mounted on each side wall 1) I2 of the conveyance path 10. A pair of sensor groups 15.16 on the leading side in the conveyance direction and a pair of sensor groups 17.18 on the rear side in the conveyance direction are respectively disposed in opposing positions. The distance between the front sensor group +5.16 and the rear sensor groups 17 and +8 is set to be smaller than the longitudinal length of the paper sheet 20 such as a banknote to be identified. Each sensor group 15 to 18 has a plurality of optical detection elements+5. , +5. , ...+5. l.

+6. , +6. , -・-16,, +7. ．． 171...
+7. , +8. ,+8□,...1B.

It has a configuration in which each optical detection element is arranged in a line to protrude inward in the width direction of the conveyance path.

When the banknote is being conveyed in a normal posture (non-skew posture) along the center of the conveyance path 10, the number of detection elements constituting each sensor group that are shielded is the same. In addition, if the posture is normal but the position is shifted to either the left or right side, for example to the left side, the number of shielded detection elements in the left sensor group 15 and 17 and the number of shielded detection elements in the right sensor group 16 The number of shielded sensing elements in .18 differs.

Next, the paper sheet 20 shown in Figure 1 is a banknote and is skewed to the left.The number of sensing elements in each sensor group 15, +6, 17, and 18 shielded by this banknote 20 is Q+, respectively. If Xx, Il+, Il,! , -j!
+ sO, 12□ -1! , □'40, a skew has occurred.

In the case of left skew, 21-β1>0, and in the case of right skew, ℃1-ε.

<Becomes 0.

When n, -λx = Q, n+ '-f2x° = 0, it means that the object is being transported in the correct posture along the center of the transport path.

If the six values of AI Ilx and βl' nxo are other than O and are the same value, it means that the width is aligned to the left or right in a non-skewed state. Further, if the 6 value is positive, the width is shifted to the left, and if it is negative, the width is shifted to the right.

By checking the number of sensing elements shielded at the front and rear in this way, it is possible to easily distinguish between skew and width shifting.

Note that in the non-skew state, the width of one banknote is Il
It can be known from the formula ++ilx, ρl'+Am'.

Next, as shown in FIG. 2, the skew detection function similar to that of the embodiment shown in FIG. be.

If the total longitudinal length of the bill 20 as the object to be detected is, for example, 50 mm, and the conveyance distance for one pulse of the pulse motor 27 is 1 mm, the timing of detection by the pair of pulse motors 27 is determined from the tip of the bill. 15
pulse (15 mm) and 100 pulse (100 m
m>, and in the detection at each time point, the sensing elements 151) 5g, ... 15n, 161.16m,
. . . Based on the number of shielded elements out of 16n, it is possible to know whether skew has occurred and its mode.

The method of detecting the presence or absence of skew, the direction of skew, the degree of width adjustment, etc. is exactly the same as in the case of FIG.

The banknote identification device identifies denominations and authenticity using both width detection and skew detection.

For example, as shown in FIG. 2 (bl), the width of the transport path 10 is set to 78 mm, the sensor pitch in the sensor group 15.16 is set to 2.5 mm, and the widths of the three types of banknotes A, B, and C are each 65 mm. ±2.5mm, 70±2.5mm, 75±
According to the detection method of the present invention, when the diameter is 2.5 mm,
Banknote A when the number of detections by the optical detection element is 5≦ and ≦7.

Banknote B when 8≦Km≦9.

When K, ≦lO, banknote C1 , respectively.

After determining the type of banknote in this manner, the presence or absence and degree of skew is determined using the skew detection method described above.

That is, the number of detection elements that detect five banknotes is 5≦K.

≦7, it is determined that the banknote is A, and furthermore, when the difference Ks in the number of elements detected by the opposing sensor groups 15 and 16 is IK, and when 1≧2, it is determined that an over-skipping has occurred. .

FIG. 2 (C1 is a diagram showing the state of the banknotes mentioned above,
Detection element in sensor 15 +5. The presence of the banknote 1 is detected in all of the cases 1 to 15. on the other hand.

Sensor 16 is a detection element! 6. to 16. 16 of them
The presence of banknotes is detected only in 16□ and 16□.

Therefore, in the above, the value of is .

K, = 5 + 2 = 7, so it is determined that it is one banknote A, and the difference in the number of detection elements is = 5 - 2 = 3, and when IK, 1≧2, it is determined that a skew has occurred.

Then, if K≧2, it is determined that there is a left skew, if Ks≦−2, it is determined that there is a right skew, and if Hcsl≦l, there is no skew.

Next, the total number of detection elements that detect banknotes is 8≦KW≦
In the case of 9, it is determined that a skew has occurred when the absolute value IK of the difference in the number of sensing elements is 1, and 1≧■.

Then, if Ks≧1, the left skew is determined, and if Ks≦−1, the right skew is established (I1).

If the total number of detection elements for detecting banknotes is ≦10, it is determined that there is no skew, and when l≦1, it is determined that there is no skew, and I
If Kj I>1, it is considered an abnormality and is rejected.

The control unit of the identification device not only stores the non-skew identification pattern for each denomination in the storage unit, but also assumes several scuba turns for each banknote.
An identification pattern is memorized for each assumed pattern. As a result, the accuracy of banknote identification can be improved.

Furthermore, the present invention can detect skew without error not only when the leading edge of the paper sheet is bent, but also when the trailing edge corner is bent.

Note that in the above embodiments of the present invention, one or two pairs of sensor groups are arranged facing each other on both sides of the conveyance path in the width direction, but when detecting long paper sheets, etc., it may be necessary to Of course, three or more pairs of sensor groups may be arranged depending on the situation.

In addition, in the embodiment of the present invention, the width of the banknote, the sensor pitch, etc. of the conveyance path 1 are set to predetermined values in advance, and the explanation is based on them. However, since the width of the conveyance path and the sensor pitch change depending on the shape of the bill being measured,
It is obvious that the six values of , niyu and KS 1 are not limited to the numerical values shown in this embodiment.

(5?! Bright effect) As described above, according to the present invention, it is possible to prevent the occurrence of skew due to the bending of the leading corner of the conveyed paper sheet, and to prevent misjudgment regarding the form of skew. Identification can be made.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration explanatory diagram of a first embodiment showing the principle of the present invention, and FIG. An explanatory diagram of an example in which a skew detection function similar to that of the embodiment in FIG.
al (b) is an explanatory diagram of a conventional example. 10...Transport route 1). 12...Each side wall +5.1
6.17.18...Sensor group +5. ．． +52. ~15
n, +6. , +6. ,~160.17. ．． +7□, ~1
7. , +8. ．． 183. ...18. 20...Paper sheets Figure 3 Cause 4 Patent applicant: Toyo Tsushinki Co., Ltd. Agent Patent attorney Hitoshi Suzuki

Claims (3)

[Claims] (1) In a device for identifying the type, authenticity, etc. of paper sheets during the process of transporting the paper sheets, the identification device is configured to face inward from predetermined positions on both widthwise edges of the paper sheet transport path. a control unit that determines the width of paper sheets, the presence or absence of skew, and the degree of skew based on the number of sensors that are blocked by the paper sheets passing through the sensor group; A skew detection device for paper sheets, characterized in that the number of detected parts of the paper sheets to be received is two or more. (2) A paper sheet skew detection device, wherein the first detected part of the paper sheet to be detected by the sensor group is a predetermined distance behind the leading edge of the paper sheet. (3) A paper sheet skew detection device, wherein the last detected part of the paper sheet to be detected by the sensor group is a predetermined distance ahead of the rearmost end of the paper sheet.