JPH02168108A - Detecting device of thickness of paper leaf - Google Patents

Abstract

PURPOSE:To enable correct detection of the thickness of a paper leaf by determining that an extraneous substance sticks on a reference roller or a detection roller, when detection data show a prescribed value or above in relation to reference data. CONSTITUTION:An angular displacement sensor 3 outputs a displacement amount signal in a state wherein a bank note is not conveyed. This signal is amplified by an amplifier 21 and then it is converted into a digital signal by an A/D converter 22 and delivered therefrom to a counter 23. Next, the digital signal is binary-coded in the counter 23 and stored as detection data D in a memory element 29 through a control element 28. In the control element 28, subsequently, a difference between the data DK and first reference data D1 stored in the memory element 29 is calculated and a difference signal (DK-D1) thus obtained is compared with second reference data D2 stored as a threshold value before hand in the memory element 29. When there is a part wherein the data D is larger than the data D2, it is judged that an extraneous substance sticks, and it is displayed in a display element 30 that the extraneous substance sticks.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to a paper sheet that detects the thickness of a banknote being conveyed, for example, in a banknote inspection device used in an automatic teller machine. This invention relates to a type of thickness detection device.

(Prior art) For example, as in a bill inspection device, a bill 1 being conveyed
In a device that reads information contained in each banknote, one of the important items is to detect the thickness of the banknote.

The thickness detection device for this purpose is used to determine whether a single banknote is being conveyed or whether there is no tape attached to it, and it is configured as follows. ing.

In other words, a movable detection roller is brought into contact with a reference roller that serves as a standard for thickness measurement, and by passing a banknote conveyed by a conveyor belt between these two rollers, the thickness of the banknote being detected is detected. The amount of displacement of the roller is converted into an electrical signal using, for example, an angular displacement sensor, and the electrical signal determines whether there is one bill, a bill with tape attached, or two or more bills. It is for discrimination.

However, in the conventional thickness detection device configured as described above, detection was performed assuming that the base south surface of the base roller and the circumferential surface of the detection roller do not change and are constant. When foreign matter such as dust adheres to the surface of the roller, the thickness of the banknote (paper sheet) determined by a thickness detection device using the back roller or detection roller will be the thickness of the foreign matter. This had the disadvantage that the thickness of the actual majesty could not be detected correctly.

(Problems to be Solved by the Invention) As described above, the present invention provides that when foreign matter such as dust adheres to the surface of the back roller or the detection roller, the 117' edge detection device using the reference roller or the detection roller can: This was done to solve the problem of not being able to accurately detect the thickness of paper sheets. It is an object of the present invention to provide a paper sheet thickness detection device that can accurately detect the thickness of paper sheets even when there is foreign matter such as dust on the surface of the detection roller. There is.

[Structure of the Invention] (Means for Solving the Problems) The paper sheet thickness detection device of the present invention comprises a base q roller serving as a constant reference roller of thickness rlt'1, and a freely displaceable roller that contacts this reference roller. In a thickness detection device that detects the thickness of a paper sheet by feeding a paper sheet, which is a fixed object, between a detection roller and converting the amount of displacement of the detection roller into an electric signal, processing means for obtaining reference data by converting the amount of displacement of the detection roller into an electric signal with no foreign matter adhering to the reference roller or the detection roller in advance, and no paper sheet existing between the reference roller and the detection roller; a paper sheet detection means for detecting the presence of a paper sheet between the back roller and the detection roller; a comparison means for comparing the detection data obtained by converting the detection data to the basic data; and when the detection data exceeds a predetermined value with respect to the reference data as a result of the comparison by the comparison means, the reference roller or the detection roller The present invention is characterized by comprising a determination means for determining whether a foreign substance is attached to the surface of the image forming apparatus.

(Function) The present invention cleans the uQ flora and the detection roller, which are the basis of the tp1 thickness, in advance to prevent any foreign matter from adhering to them, and obtains reference data based on the amount of displacement of the detection roller without conveying paper sheets. 11; is detected based on the amount of displacement of the detection roller when the paper sheet detection means detects that there is no paper sheet between the reference roller and the detection roller in the subsequent operating state. The data is compared with previously obtained reference data, and if there is a difference of more than a predetermined value between them, it is determined that there is a foreign object attached to the base q roller or the detection roller.

This may cause foreign matter to be attached to the reference roller or detection roller.
When something happens, we can notify you immediately.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a reference roller that is the basis of constant Δp1, 2 is a movable detection roller that contacts the reference roller 1, and 3 is an angular displacement sensor that converts the amount of displacement of the detection roller 2 into an electrical signal. Reference numeral 4 denotes a banknote, which is a regular object for the limbs, and 5 a conveyor belt that clamps and conveys the banknote 4.

The conveyor belt 5 runs between the base and the roller 1 and the detection roller 2.
When the banknote 4 held between the banknotes 4 is conveyed in the direction of the arrow shown in the figure, the detection roller 2 moves upward according to the thickness of the banknote 4, and the angular displacement sensor 3 detects a voltage according to the F hyperactivity of the detection roller 2. It is designed to output .

Further, 6 is a ♀I between the base roller 1 and the detection roller 2.
There is a sensor that detects whether CFff is 4 or (i: (1:).

FIG. 2 is a block diagram of the electric circuit of this embodiment.
is an amplifier 22 that amplifies the output signal of the angular displacement sensor 3;
11 is an A/D converter that converts the analog signal output from the amplifier 9 into a digital signal, and 11 is a counter that counts the digital signal output of the A/D converter 10 and holds the displacement amount of the detection roller 2 as a digital value. be. Further, 24 is a detection circuit that receives a detection signal from the position sensor 6 and detects whether or not a banknote 4 exists between the reference roller 1 and the detection roller 2, and detects the presence of the banknote 4. When this happens, a signal indicating this is sent to the control section 26. Further, 26 is a motor that rotationally drives the reference roller 1;
27 is a driver that drives the motor 27.

The control unit 28 is composed of, for example, a microcomputer, and controls the entire apparatus.

In other words, the output value of the counter 23 is taken in and the detection roller 2 is
It recognizes the amount of displacement of the sensor, receives the detection signal from the detection circuit 24, performs corresponding processing, and performs various other controls. Reference numeral 29 denotes a storage unit that stores control programs for operating the microcomputer of the control unit 2H, data necessary for processing, first base data, second reference data, etc. to be described later. Also,
The display unit 30 displays the status of the device, messages from the device, and the like.

Next, the operation in the above configuration will be explained. First, by cleaning the basic roller 1 and the detection roller 2, it is confirmed that no foreign matter such as dust is attached thereto, and in this state, the power is turned on. Then, the control unit 28 performs initialization processing and then sends a control signal to the motor 26 via the driver 27. As a result, the motor 26 is rotationally driven and the reference roller 1 starts rotating. Then, when the rotational speed of the reference roller 1 increases and reaches a steady state, the output of the position sensor 6 indicates whether or not the banknote 4 is present between the reference roller 1 and the detection roller 2 via the detection circuit 24. A signal is sent to the control section 28. When the control unit 28, which constantly monitors this signal, detects that the banknote 4 is not present,
The output of the angular displacement sensor 3 at that time is stored in the storage section 29 for one rotation of the reference roller. In other words, the angular displacement sensor 3 outputs a displacement signal when the banknote 4 is not being conveyed, and this signal is amplified to a predetermined value by the amplifier 21, and then converted into a digital signal by the A/D converter 22. It is converted and sent to the counter 23. The counter 23 generates binary data when the banknote 4 is not being conveyed by counting the received digital signals. The two-shift data from the angular displacement sensor 3 obtained when the banknote 4 is not being conveyed to the counter 23 in this way is sent to the control unit 28, and then stored in the storage unit 29 as the first reference data D1.
is stored in The first reference data D1 obtained in this way is shown in FIG. 4(a).

As shown in the figure, the detection roller 2 is in contact with the reference roller 1 with a predetermined pressure, so in a steady state it is in contact with the reference roller 1 at a predetermined angle, and the amount of displacement at this time is Let be fl.

On the other hand, the storage unit 29 stores data having a value that is a certain value higher than the amount of displacement outputted by the normal base q roller 1 to which no dust or the like is attached, as second reference data D2. That is, this second reference data D2 is used as a Threnon fold value when detecting foreign objects such as dust, which will be described later.

Next, when the device is in operation and the banknotes 4 are not being conveyed, that is, in a state where the position sensor 6 is not detecting the banknotes 4, the detection of foreign objects such as dust, which will be described below, is always performed.

That is, as shown in FIG. 3, consider a case where, for example, there is dust attached to the banknote 4 that has been conveyed, and this is transferred to the reference roller 1 and becomes a foreign object.

When the control section 28, which always receives the signal from the angular displacement sensor 3, detects that the banknote 4 is not present, the control section 28 changes the output of the angular displacement sensor 3 at that time to 21L/III'1.
Only one revolution of 0-1 is stored in the storage unit 29.

That is, the angular displacement sensor 3 outputs a displacement signal when the banknote 4 is not being conveyed, and this signal is amplified 11!
! z) After a predetermined amplification is performed in step 1, the signal is converted into a digital signal by an A/D converter 22 and sent to a counter 23. The counter 23 binarizes the signal from the angular displacement sensor 3 by counting the received digital signal, and records it as detection data DK via the control unit 28.
It is stored in section a 29. The detection data DK obtained in this way reflects the amount of displacement of the detection roller 2 due to the foreign object, and a signal is obtained in which the location corresponding to the foreign object changes significantly as shown in FIG. 4(b). .

Next, the control section 28 calculates the difference between the detection data DK obtained as described above and the first method data D1 detected previously and stored in the storage section 29. The data representing the difference obtained in this way has an eccentricity (D K −D
1. ) or IQ.

Next, the difference signal (DK-Dl) is compared with the second reference data D2 recorded in advance in the storage unit 29 as a threshold value, and the detected data DK is higher than the second reference data D2. If there is a large part, that part (4th
It is determined that a foreign object is attached to the area shown in Figure (d),
For example, the display unit 30 displays a message that foreign matter is attached.

Note that during normal thickness detection, that is, when detecting the thickness by conveying the banknote 4, the detection roller 2 moves up and down according to the thickness, and the angular displacement sensor 3 moves up and down according to the amount of displacement. Output a signal. After this signal is amplified to a predetermined value by an amplifier 21, it is converted into a digital signal by an A/D converter 22 and sent to a counter 23. The counter 23 obtains thickness data of the banknote 4 as binary data by counting the received digital 1g number. The binary data regarding the thickness of the banknote 4 obtained by the counter 23 in this way is sent to the control unit 28, where its validity is checked and used to determine whether the banknote 4 is genuine or not. It will be flooded.

As explained above, data indicating the amount of displacement of the detection roller 2 with respect to the surface position of the base q roller 1 of the device is created in advance, and when the device is in operation and the banknote 4
During the period when the roller is not being conveyed, the amount of displacement of the detection roller 2 with respect to the surface position of the reference roller 1 is detected, and if there is a change of more than a predetermined value (threshold value) when compared with the above reference data, the displacement of the detection roller 2 is detected. It is determined that there is a foreign object attached to roller 2, and a message to that effect is displayed.
If foreign matter adheres to the reference roller 1 or the detection roller 2 for some reason, the device can be stopped immediately and the foreign matter can be removed.
It is something that can be done.

In addition, the above threshold value is a value of 1 in the storage unit 2.
Since the value can be memorized and used, it is possible to select the optimum value for the device, and it is possible to improve the 1J requirement for thickness detection.

In the above embodiment, the paper sheet whose thickness is to be detected is a banknote, but the present invention is not limited to this. The same applies.

[Effects of the Invention] As detailed above, according to the present invention, the reference roller and the detection roller, which meet the A+++ standard thickness, are cleaned in advance to prevent foreign matter from adhering to them, and paper sheets are not conveyed. Based on the amount of displacement of the detection roller, <u; semi-data is created, and in the subsequent operating state, the paper sheet removal means is used to ensure that no paper sheet exists between the base mulberry roller and the detection roller. When detected, dangerous! Based on the displacement of 410-ra? 1
? The detection data obtained is compared with the previously obtained reference data, and if there is a difference of more than a predetermined value between them, it is determined that there is a foreign object on the base roller or detection roller. Therefore, even if foreign matter such as dust adheres to the step surface of the reference roller or detection roller, the thickness of the paper sheet can be accurately detected even if foreign matter such as dust adheres to the step surface of the reference roller or detection roller.
lj) can be done.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram of the main parts of the thickness detection device, Fig. 2 is a block diagram of the electric circuit,
FIG. 3 is an explanatory diagram illustrating a state in which dust is attached, and FIG. 4 is a waveform diagram illustrating the operation. DESCRIPTION OF SYMBOLS 1... Reference roller, 2... Detection roller, 3... Angular displacement sensor, 4... Banknote (paper sheet) 6... Position sensor (paper sheet detection means) 24... Detection circuit, 27
...Driver, 26...Motor, 28...Control unit, 29...Storage unit, 30...Display unit, D...Foreign object.

Claims (1)

[Claims] A paper sheet, which is an object to be measured, is fed between a reference roller that serves as a standard for measuring thickness and a displaceable detection roller that contacts this reference roller, and the displacement of the detection roller at this time is In a thickness detection device that detects the thickness of paper sheets by converting the amount into an electrical signal, the displacement amount of the detection roller is converted into an electrical signal in advance with no foreign matter attached to the reference roller or the detection roller. processing means for obtaining reference data; paper sheet detection means for detecting that no paper sheet exists between the reference roller and the detection roller; a comparison means for comparing the detection data obtained by converting the displacement amount of the detection roller into an electric signal and the reference data when detecting that there is no paper sheet in between; and a comparison result by the comparison means. , a determination means for determining that foreign matter is attached to the reference roller or the detection roller when the detection data exceeds a predetermined value with respect to the reference data. Detection device.