JPH0571944A - Device for detecting thickness of paper sheet - Google Patents

Abstract

PURPOSE:To obtain a device for detecting a thickness of a paper sheet which can reduce the number of output adjustments of a sensor and the adjustment time by enabling adjustment of a quantity of light of the sensor to be performed effectively. CONSTITUTION:A comparison means for outputting as an adjustment value for adjusting a difference when there is a difference by comparing an output of a sensor with an adjustment target value and a control means which calculates a compensation value by adding an acceleration prospect value for accelerating adjustment processing to the adjustment value and then adjusts an output of the sensor with this adjustment value are provided. By adding the acceleration prospect value for accelerating the adjustment processing to the compensation value of adjustment, a large amount of adjustment of sensor is taken, thus enabling adjustment to be speeded up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects, for example, when the banknotes are stacked one by one from a stacking unit where the banknotes are stacked and stacked, the thickness of the stacked banknotes is one or two. The present invention relates to such a sheet thickness detecting device.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned sheet thickness detecting device is
It had a structure as shown in FIG.

That is, a pickup roller 2 is provided in opposition to a reference roller 1 which is conveyed and driven by an appropriate motor.
The pickup roller 2 is pivotally supported on the middle portion of the pickup lever 3, and one end of the pickup lever 3 is pin 4
The pickup roller 2 is urged toward the reference roller 1 side by a spring 5, and the linear output sensor 6 is provided opposite to the other end of the pickup lever 3 described above. Reference numerals 7 and 8 denote scrapers that are urged toward the rollers 1 and 2 to clean the peripheral surfaces of the rollers 1 and 2, and 9 denotes a paper sheet conveyance line.

Then, the linear output sensor 6 detects the movement of the pickup lever 3 when the sheet passes between the rollers 1 and 2 and the output at that time determines the thickness of the sheet.

The above-mentioned linear output sensor 6 uses a well-known photoelectric sensor composed of a light projector and a light receiver, and a light shield plate 10 for adjusting the amount of light to be input is provided on the light receiver side. By adjusting the position of 10 with the screw 11, the output of the linear output sensor 6 can be adjusted.

Further, as shown in FIG. 5, in addition to the photoelectric sensor 12, the linear output sensor 6 is composed of a variable volume for adjusting the output of the sensor 6, and a variable adjuster 13 for outputting a digital value. And the D / A converter 14 that converts the digital value into an analog value and adjusts the current flowing through the photoelectric sensor 12 to change the light amount. Therefore, the output adjustment of the linear output sensor 6 is performed as described above. It has two adjusting means for adjusting by rotating the screw 11 for changing the position of the light shielding plate 10 and for adjusting the rotation of the variable adjuster 13 described above.

Since the output of the above linear output sensor 6 is output as an analog value, it is converted into a digital value by the A / D converter 15 and input to the CPU 16, and the display 17 is used.
Is displayed. Further, the CPU 16 has a ROM 18 storing a program and a RAM 19 storing an adjustment target value.

Further, as shown in FIG. 6, the output waveform of the above linear output sensor 6 has a linear area in the middle portion and has a curved waveform at both upper and lower end portions, so that an accurate paper sheet is obtained. For detecting the thickness of a class, the above-mentioned linear area of the intermediate portion must be used, and output adjustment to this area is required.

For example, the output of the linear output sensor 6 (output of the A / D converter 14) when the reference roller 1 and the pickup roller 2 are in direct contact with each other and the gap between the rollers 1 and 2 is 0 mm is digitalized. The value is set to the adjustment target value of 100, and the output of the linear output sensor 6 when the gap of 1 mm is opened between the reference roller 1 and the pickup roller 2 is set to the adjustment target value of 200 as a digital value. When set, the stroke of the pickup lever 3 is determined as the movement amount and stroke range from the gap 0 mm to the gap 1 mm between the rollers 1 and 2 described above. Therefore, by adjusting the output (waveform) of the linear output sensor 6, It must be adjusted so that its output matches the aforementioned adjustment target value.

This adjustment will be described with reference to the work flow of FIG. 7. First, when the linear output sensor 6 is attached to the pickup lever 3, the detection position of the sensor 6 is placed within the movable range of the lever 3 detection portion. After mounting, the gap between the rollers 1 and 2 is set to 0 mm, and the output of the linear output sensor 6 at that time, that is, whether the digital value is 100 ± 1 of the adjustment target value is confirmed on the display 16. If the displayed value deviates from the adjustment target value (step n1), the screw is adjusted to adjust the position of the light shielding plate 10 so that the displayed digital value becomes 100 ± 1 of the adjustment target value. 11 is rotated (step n2) to adjust the amount of light incident on the photoelectric sensor 12.

Next, a medium of 1 mm is interposed between the rollers 1 and 2 and the gap is set to 1 mm (step n).
3), the output of the linear output sensor 6 at that time, that is,
Whether the digital value is 200 ± 1 of the adjustment target value is confirmed on the display 16 (step n4). When the displayed value matches the adjustment target value, the next adjustment confirmation is performed. However, if the deviation is from the adjustment target value, the position of the light shielding plate 10 is adjusted so that the displayed digital value becomes 200 ± 1 of the adjustment target value (step n5), and the photoelectric sensor 12 is adjusted. Adjust the amount of incident light.

For example, if the digital value is 180, there will be a +20 deficiency, and this +20 is the adjustment value, and the position of the light shielding plate 10 is adjusted so that the digital value becomes 200 ± 1. Then, the output of the linear output sensor 6 is adjusted.

Next, the gap between the rollers 1 and 2 is 0 mm.
Then, the adjustment confirmation is executed (step n6). That is, the display 16 confirms whether or not the digital value of the output of the linear output sensor 6 is within 100 ± 1 of the adjustment target value. When the distance between the two rollers 1 and 2 is 1 mm, the digital output is 200 ± 1, and when the distance between the two rollers is 0 mm, the digital value is 100 ± 1.
In that case, the adjustment is OK, and the output when the distance between the rollers 1 and 2 is 1 mm is 180, which is a digital value of 180. However, when the distance between the rollers is 0 mm, the digital value is 100. If ± 1, the adjustment is OK (step n7, YES).

However, in reality, the adjustment is not completed in a small number of times as described above, a deviation from the target value occurs even when the above-mentioned adjustment target value 200 ± 1 is adjusted, and the above-mentioned adjustment target value 100 for confirmation of the adjustment. The deviation from the target value has occurred even with the adjustment of ± 1 (step n7, NO).

Therefore, the output cannot be adjusted properly by adjusting only the position of the light shield plate 10. Therefore, next, the photoelectric sensor 1 of the linear output sensor 6 is changed by the variable adjuster 13.
The amount of light is varied by adjusting the current flowing through 2 to adjust the output (step n8). However, when the adjustment by the variable adjuster 13 is executed, the adjustment value depending on the position of the light shielding plate 10 is naturally changed, and the position of the light shielding plate 10 needs to be adjusted again (return, step n1).

Further, since the actual adjustment amount is small in the adjustment by the variable adjuster 13 described above, for example, the adjustment target value is 100 ± 1, and the adjusted output is the digital value 12
If 0 is +20 over, use the variable adjuster 13
Even if you adjust 20 minutes and adjust to the target value of 100 ± 1,
Actually (returned step n7) is a digital value 115
The adjustment output is of a degree, and the change in adjustment is a digital value +
Only 5 can be obtained.

For the work of adjusting the output of the linear output sensor 6 as described above, the adjustment by the variable adjuster 13 is indispensable.
Considering that the adjustment amount of this adjustment is small, the shading plate 10
It is necessary to repeat the position adjustment frequently, and as a result, the position adjustment of the light shielding plate 10 and the light amount adjustment of the variable adjuster 13 are repeatedly executed, and the number of times is about 15 times which is a balanced adjustment number. However, there is a problem that adjustment takes time and requires skill.

[0018]

SUMMARY OF THE INVENTION In view of the small adjustment amount of the variable adjuster 13 described above, the present invention effectively adjusts the light amount of the photoelectric sensor so that the output adjustment of the sensor can be controlled. An object of the present invention is to provide a paper sheet thickness detection device that can be reduced in number and shortened in adjustment time.

[0019]

SUMMARY OF THE INVENTION According to the present invention, a pickup lever that is movable in proportion to the thickness of a paper sheet is axially supported in a paper sheet conveyance path, and a sensor is provided opposite to the movable portion of the lever.
A sheet thickness detecting device for detecting the thickness of a sheet based on the output difference of this sensor, and when the output of the sensor and an adjustment target value are compared and there is a difference, the difference is adjusted. Comparing means for outputting as an adjustment value for, and when the adjustment value is a value that requires adjustment, a correction value is calculated by adding a promotion prospective value for promoting the adjustment process to the adjustment value,
The thickness detection device for a paper sheet is provided with a control unit that adjusts the output of the sensor based on this correction value.

[0020]

In the paper sheet thickness detecting device of the present invention, when the output of the sensor and the adjustment target value are compared and there is a difference, the adjustment value which is the difference is used as an acceleration prospective value for promoting the adjustment process. The output of the sensor is adjusted with the added correction value.

[0021]

As a result of the above, according to the present invention, since the acceleration prospective value for accelerating the adjustment process is added to the adjustment correction value, the adjustment amount of the sensor can be increased and the adjustment can be speeded up. As a result, the number of adjustments is reduced and the adjustment time is shortened.

Further, since the light quantity of the photoelectric sensor can be automatically adjusted by the control means, the adjustment work does not require skill, and the adjustment work can be speeded up and its accuracy can be improved.

As a result, if the conventional number of adjustments is about 15 times, the adjustment can be completed in a small number of about 5 times in the present invention.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

Since the paper sheet thickness detecting device in this embodiment has the same structure as that shown in FIG. 4, the description of the structure is incorporated by reference in FIG. FIG. 1 shows a control circuit of the sheet thickness detecting apparatus. Components having the same functions as those in FIG. 5 described above are designated by the same reference numerals, and the details are incorporated by the description of FIG.

In FIG. 1, the D / A converter 14 and the CPU 16 are connected so that the CPU 16 automatically adjusts instead of adjusting the light amount by the variable adjuster 13 of the linear output sensor 6.

FIG. 2 shows the adjustment work flow. Since the adjustment by the light shield plate 10 is the same as the adjustment shown in FIG. 7, the steps n21 to n27 in FIG.
Since it is the same as steps n1 to n7, the description thereof will be omitted.

The above-mentioned automatic adjustment by the CPU 16 is to adjust the current flowing through the photoelectric sensor 12 to change the light quantity. The D / A converter 14 is controlled for this adjustment, and the RAM 19 is corrected. A correction value table 20 storing values is provided.

The correction values in the correction value table 20 described above are set as follows. That is, when the adjustment target value when the gap between the reference roller 1 and the pickup roller 2 is 0 mm is set to 100 as a digital value, step n in FIG.
If the determination of 27 is, for example, 120 as a digital value, 120-100 = 20, and this +20 is the adjustment value, but the acceleration prospective value for promoting the adjustment is added to the adjustment value to obtain the correction value. Is calculated.

That is, since the current digital value is 120, the adjustment is 120-20 (adjusted value) -20 (promotion expected value) = 80. Further, if the current digital value is 80 as another example, adjustment is made. Is set so that 80 + 20 (adjusted value) +20 (promotional expected value) = 120. The above-mentioned -20 (adjustment value) -20 (promotion potential value) +20 (adjustment value) +20 (promotion potential value) is used as the correction value.

The acceleration prospective value in the above-mentioned correction value is set under the condition that it is large when the adjustment value is large and small when the adjustment value is small.
Alternatively, like -20, it is similarly set for both + and-, and is provided as a table. Then, by accessing this table with the aforementioned adjustment value, the correction value obtained by adding the promotion prospective value to the adjustment value is read.

The light amount automatic adjustment processing of the sweep n28 in FIG. 2 will be described with reference to the flowchart of FIG.
In step n26 of FIG. 2, the digital value when the gap between the reference roller 1 and the pickup roller 2 is 0 mm is displayed on the display 17, and this digital value is stored in the predetermined area of RA19, and the CPU 16 sets the adjustment target. The value is compared with the digital value 100 to determine how much the adjustment value is in the + direction or the-direction, and the correction value is calculated from the current digital value (step n31).

For example, as in the above example, the current digital value is 120 and the adjustment value is 120-100 = 20.
If it is a (digital value), this adjustment value “+2
The correction value table 20 is accessed with "0" to read the correction value. As described above, this correction value is set to -20 (adjustment value) -20 (promotion expected value) = -40 (correction value). ing.

Next, an execution value (analog value) for executing this adjustment is calculated. This execution value is obtained by adding a value obtained by integrating a constant α to the above-mentioned correction value (for example, the above-mentioned digital value “−40”) to the execution value of the previous time (the value obtained by converting the current digital value into the analog value).

For example, the current digital value in the above example is 1
Assuming that the correction value has a digital value of -40 in 20, the current execution value (digit value) = 120-40.alpha., And the CPU 16 transfers this execution value (digit value) to the D / A converter 14 of the linear output sensor 6. By inputting, the D / A converter 14 converts this into an analog value and automatically adjusts the light amount of the photoelectric sensor 12 (step n32).

The output of the linear output sensor 6 at this time is converted into a digital value by the A / D converter 15, and the correction value calculated by subtracting the digital value 100 of the adjustment target value from this converted value is first obtained. It is determined whether the correction value is within the determined correction value ± 1 (step n33).
If it is O, the process returns to step 32, the previous execution value is adjusted so as to be within the above-mentioned correction value ± 1, and if OK is obtained by this adjustment, the automatic adjustment of the light amount is completed, and Return to step n21.

In this way, when the output adjustment shown in FIG. 2 is performed, the promotion expected value for promoting the adjustment process is added to the adjustment correction value, so that a large adjustment amount of the photoelectric sensor 12 can be obtained. Adjustments can be made faster, resulting in less adjustments and shorter adjustment times. Further, by adjusting with the CPU 16, the light quantity of the photoelectric sensor 12 can be automatically adjusted, so that the adjusting work does not require skill, and the adjusting work can be speeded up and its accuracy is improved. The correction value is stored in advance in the correction value table 20.
The calculation condition may be given to 16 and the calculation may be performed each time, and the correction value may be calculated by fuzzy control.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit of a sheet thickness detection device.

FIG. 2 is an adjustment work flowchart.

FIG. 3 is a flowchart of automatic light amount adjustment.

FIG. 4 is a configuration diagram of a sheet thickness detection device.

FIG. 5 is a control circuit block diagram of a conventional sheet thickness detection device.

FIG. 6 is an output waveform characteristic diagram of the sensor.

FIG. 7 is a conventional output adjustment work flowchart.

[Explanation of symbols]

 1 ... Reference roller 2 ... Pickup roller 3 ... Pickup lever 6 ... Linear output sensor 12 ... Photoelectric sensor 14 ... D / A converter 16 ... CPU 20 ... Correction value table

Claims (1)

[Claims] 1. A pickup lever, which is movable in proportion to the thickness of a paper sheet, is pivotally supported on a paper sheet conveyance path, and a sensor is provided in opposition to a movable portion of the lever. Based on an output difference of the sensor. A sheet thickness detecting device for detecting the thickness of a sheet, wherein when there is a difference by comparing the output of the sensor and an adjustment target value, a comparison is made to output the adjustment value for adjusting the difference. Means, and when the adjustment value is a value requiring adjustment, a correction value is calculated by adding an acceleration prospective value for promoting the adjustment process to the adjustment value, and the output of the sensor is adjusted by this correction value. An apparatus for detecting the thickness of paper sheets, which comprises a control means.