JPH0524558B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a banknote counting machine that counts banknotes while turning them over at regular intervals with a suction shaft. This invention relates to an off-pressure adjustment function of a banknote counting machine that aims to improve counting accuracy by appropriately varying the off-pressure that serves as a criterion for determining whether or not there is paper.

``Prior Art'' As a banknote counting machine that counts banknotes by detecting changes in suction pressure (vacuum pressure), the one shown in Japanese Patent Application Laid-open No. 88076/1983 has been known for a long time. It is being

This bill counting machine is equipped with a pressure conversion element that detects the vacuum pressure in the suction shaft, and the number of changes in vacuum pressure detected by this pressure conversion element (the number of changes in vacuum pressure above a certain level (off pressure)). The banknotes loaded in the holder are counted by appropriately counting the number of increases and decreases (increases and decreases in one set).

"Problems to be Solved by the Invention" By the way, in the above banknote counting machine, the suction pressure of the banknotes suctioned by the suction shaft varies under the following conditions. In other words, (1) changes due to paper quality (thin paper has higher adhesion to the suction shaft, resulting in higher suction pressure), (2) changes in vacuum pump rotation speed due to voltage fluctuations, (3) vacuum pump (4) Resistance that occurs locally due to dirt entering the piping system, (5) Air leakage that occurs in the part that generates vacuum pressure on the suction shaft, (6) Air pressure when used at high altitudes. The suction pressure of banknotes fluctuates depending on the conditions such as change.

In particular, (1) changes due to paper quality have a large influence. For example, when trying to count thin paper sheets while the off-pressure (the level used as a criterion for determining whether or not there are bills to be picked up by the suction shaft) is always constant, the suction pressure is too high. There is a risk of overcounting (changes in suction pressure that would not normally be counted) may occur, and conversely, when trying to count thick paper sheets, the suction pressure may be too high. If the value becomes too low, changes in adsorption pressure that would normally be counted may be overlooked, causing a stop on the way.

In other words, conventional banknote counting machines detect abnormalities based on pressure changes when the banknotes are sucked, but there is no way to determine whether or not there is an abnormality as described above. Since the threshold value (off pressure) is not adjusted and is set at a constant value, it is not possible to immediately respond to the state changes as explained in (1) to (6) above. This may lead to frequent unnecessary stops,
As a result, a problem occurred in that detection accuracy decreased.

The present invention has been made in view of the above circumstances, and is a banknote counting machine having an off-pressure adjustment function that prevents unnecessary stops during banknote counting and prevents the accuracy of banknote counting from decreasing. The purpose is to provide

"Means for Solving the Problems" In order to achieve the above object, this invention:
As shown in Figure 1, in a bill counting machine that counts bills loaded in a holder by suctioning them to a suction shaft and turning them over one by one, the pressure is used to detect the suction pressure of the suction shaft when bills are attracted. A conversion element A and an off-pressure adjustment that determines an off-pressure that is a criterion for determining whether or not there is a banknote to be attracted to the suction shaft, based on the suction pressure detected by the pressure conversion element A. When the adsorption pressure detected by the means (b) and the pressure conversion element (a) falls below the off-pressure determined by the off-pressure adjustment means,
A counting completion determination section box is provided to stop the drive of the suction shaft and finish counting the banknotes.

"Function" According to the present invention, the off-pressure adjustment means determines the off-pressure, which is a criterion for determining whether or not there is a banknote to be adsorbed on the suction shaft, based on the adsorption pressure detected by the pressure conversion element. Furthermore, in the counting end determination section, when the suction pressure detected by the pressure conversion element falls below the off pressure, the driving of the suction shaft is stopped and the counting of banknotes is completed.

That is, in the present invention, the off-pressure, which is the criterion for determining whether or not there is a banknote to be attracted to the suction shaft, is not constant, but the off-pressure is determined by the paper quality of the banknote, the paper quality of the banknote,
Since the settings are changed in response to changes in the status of the vacuum pump, (1) changes due to paper quality, (2)
It is possible to effectively respond to changes in the rotation speed of the vacuum pump due to voltage fluctuations, (3) aging of the vacuum pump, (4) dust in the piping system, air leakage from the suction shaft (5), and (6) changes in atmospheric pressure. This makes it possible to prevent frequent unnecessary stops caused by (1) to (6).

"Example" Hereinafter, an example of the present invention will be described based on FIGS. 2 to 7.

First, the general structure of the banknote counting mechanism will be explained according to FIGS. 3 and 4. This counting mechanism places banknotes S on a holder 1 and horizontally rotates the holder 1 around an axis 2. By this, the third
When the holder 1 is in the closed position, the rotary cylinder 3 is rotated counterclockwise in the figure 1 about the axis 4. The suction shaft 5 on the rotary tube 3 is rotated clockwise around the shaft 6, and vacuum pressure is applied to the inside of the suction shaft 5 to turn over the banknotes S on the holder 1 one by one while counting. The basic configuration is as follows.

The shafts 4 and 6 of the rotary cylinder 3 and the suction shaft 5 are formed hollow as shown in FIG.
Suction port 9 of vacuum pump 8 via suction line 7
The vacuum pressure of this vacuum pump 8 is connected to the opening 1 provided in a part of the outer periphery of the absorption shaft 5.
By acting on the banknote S through the suction shaft 5, one banknote S is attracted to the suction shaft 5. Further, a pressure sensor (pressure conversion element) 11 is provided in the middle of the suction pipe 7, and the pressure sensor 11 increases the vacuum pressure in the suction pipe 7 to a level that can attract banknotes. It is now possible to detect whether or not the user has done so.

On the other hand, an exhaust pipe line 13 is connected to the exhaust port 12 of the vacuum pump 8, so that the exhaust gas from the vacuum pump 8 is discharged to the outside.

Further, a plurality of actuation pieces 17 made of a magnetic material are attached to the outer periphery of the rotary cylinder 3, and these actuation pieces 17 act as a magnetic sensor (rotary cylinder position sensor) 18.
Depending on whether the
Is the inside in a position where it communicates with the vacuum pump 8)?
Alternatively, it is detected whether the opening 10 is in the starting position (the position immediately before the opening 10 directly faces the bill S and the inside of the suction shaft 5 is shut off from the vacuum pump 8).

In addition, in FIG. 4, reference numeral 19 is a counting motor that drives the rotary cylinder 3 via a belt 20;
1 is a pump motor that drives the vacuum pump 8 via a belt 22; 23 is a holder motor that rotates the holder 1; 24A and 24B are
Holder 1 in closed position (position close to suction shaft 5)
This is a holder position detection switch that detects whether the holder is in the open position (a position away from the suction shaft 5).

Next, FIG. 2 and FIG. This will be explained with reference to FIG.

This off-pressure adjustment circuit 34 has a function of determining an off-pressure that is a criterion for determining whether or not there are bills to be attracted to the suction shaft.
A ROM (off pressure information storage unit) 35 stores off pressure corresponding to the suction pressure of banknotes, a counting program, etc. (described later), and various data are written and read according to the programs stored in this ROM 35. It mainly consists of a RAM 36 that performs these functions, and a CPU 37 that controls these. The CPU 37 is connected via an input side I/O port 38 to holder position detection switches (holder open/close position sensors) 24A, 24B, a magnetic sensor (rotating barrel position sensor (RPS)) 18, and a pressure sensor (pressure converter). An A/D converter 39 for A/D converting the signal detected by the element) 11 is connected to the output side I/O port 4.
0, a holder motor 23, a counting motor (referred to as a rotary cylinder motor) 19, and a pump motor 2.
1 are connected to each other.

The ROM 35 of the off-pressure adjustment circuit 34 stores an off-pressure (Voff) determined in accordance with the suction pressure of the banknote.
In addition, the on-pressure (Von) as the vacuum pressure necessary to start turning up the banknote (driving the counting motor 19) is stored, and the minimum An initial minimum pressure (Vntg) as the required suction pressure is stored, as well as a program for counting banknotes.

Note that the off-pressure stored in the ROM 35 is, as described above, a criterion for determining whether or not there is a banknote to be attracted to the suction shaft 5, and is the off-pressure that is determined by the pressure sensor 11. One of the plurality of stored banknotes is appropriately selected based on the detected suction pressure of the banknote. Specifically, the off-pressure is set to increase or decrease according to the suction pressure of the banknote, as shown by the symbol _A1 in FIG. 2 (the higher the suction pressure of the banknote, the higher the off-pressure is. ) as well as the suction pressure of banknotes (line indicated by A ₂ )
The off pressure band is set to a lower value and within a predetermined pressure width (the off pressure band set in this way is referred to as an off pressure band A).

The reason why the width of the off-pressure band A is determined as shown in Fig. 2 is because if it is set in a higher pressure area _A3 , the suction pressure of the banknotes (during counting) will frequently exceed the off-pressure. This is because there is a risk that the adsorption pressure may drop below the limit, causing a stop during the process.Also, if the off-pressure band A is set to the low pressure area _A4 , changes in the adsorption pressure that would normally not be detected may occur. (at the time of counting) may be counted, which may lead to overcounting.

Note that, as shown in the table of the ROM 35, one of the pre-stored off pressures is appropriately selected according to the suction pressure of the banknote detected by the pressure sensor 11, but the present invention is not limited to this. Depending on the suction pressure of, for example, the calculation formula (Y=AX+B, where Y: off pressure,
The off-state may be calculated using a constant (A<1).

Next, the bill counting program stored in the ROM 35 will be explained with reference to FIGS. 6 and 7. Note that StepN in FIG. 6 indicates Step N in the following explanation.

<Step 1> start.

<Step 2> Set the counter to 0 and proceed to the next step 3.

<Step 3> Based on the output signals of the holder position detection sensors 24A and 24B, it is determined whether the holder 1 is in the closed position, and if NO, the holder motor 23 is driven to set the holder 1 in the closed position. If the answer is YES (step 4), the pump motor 21 is started to be driven to suck outside air from the suction shaft 5 (step 5), and the process proceeds to the next step 6.

<Step 6> Depending on the presence or absence of the output from the rotary barrel position sensor (RPS) 18, the suction shaft 5 is at the starting position (that is, the position immediately before the opening 10 of the suction shaft 5 directly faces the banknote S, and the suction shaft 5 is in the starting position). If the determination is NO, the counting motor 19 is driven in reverse at low speed to set the suction shaft 5 to the starting position (step 7). ),
If YES, proceed to the next step 8.

<Step 8> Determine whether the vacuum pressure (V) of the pump motor 21 has reached the on-pressure (Von) or higher, and select NO.
In the case of YES, the counting motor 19 is started to be driven (timing
T ₀ ) (step 9), proceed to the next step 10.

<Step 10> It is detected whether the output signal from the rotating barrel position sensor (RPS) 18 has reached the first falling timing, and if YES, the process proceeds to step 14.
If NO, proceed to step 11.

To be more precise about this step 10, it is determined from the fall timing of the output from the rotary cylinder position sensor (RPS) 18 whether or not the timing is a little later than that shown in FIG. , when this timing is reached, the processing from the switch 14 onwards is started.

<Step 11> Before the output from the rotary barrel position sensor (RPS) 18 reaches the first fall timing, it is determined whether the bill suction pressure (V) has reached the initial minimum pressure (Vtng) or less. , in the case of YES, an alarm is issued to indicate that the suction shaft 5 cannot perform the suction peeling operation (step 12), and the driving of the counting motor 19 and the pump motor 21 is terminated (step 13). ), and if the determination at step 11 is NO, the process returns to step 10.

<Step 14> In step 11, the suction pressure (V) of the banknote does not fall below the initial minimum pressure (Vtng), and in step 10, the fall timing of the signal from the rotary barrel position sensor (RPS) 18 (as described above) is determined. To,
To be exact, the timing was a little later.
In the case of YES, the counter is incremented by 1 (timing T ₁ ) (step 14), and based on the suction pressure (V) detected by the pressure sensor 11, the off pressure stored in the ROM 35 is increased. Select one and store it in the RAM 36 (step 15).

<Step 16> As in Step 10 described above, it is determined whether the falling timing of the signal from the rotary barrel position sensor (RPS) 18 has arrived (to be more precise, the timing is slightly delayed, as described above). Yes, yes
In the case of NO, the process proceeds to steps 14 to 15, where the banknote count value is counted up and the off pressure is set (timings _T2 to Tn), and in the case of NO, the process proceeds to the next step 17.

In this way, the off-pressure is set at each falling timing of the signal from the rotary cylinder position sensor (RPS) 18, and this off-pressure is used as a criterion for determining the banknotes (one piece) to be counted thereafter. .

<Step 17> It is determined whether the suction pressure (V) of the banknotes is lower than the off pressure (Voff) set in step 15, and if NO, it is assumed that there are still banknotes to be counted. Return to the original step 16,
If YES, it is assumed that there are no banknotes to be counted and all counting has been completed, and the driving of the counting motor 19 and pump motor 21 is ended (step 13), and this flow is ended (step 18).

In step 15 above, the off pressure is determined as appropriate from the table shown in FIG. 5 based on the suction pressure of each bill detected by the pressure sensor 11, but the present invention is not limited to this. , the off-pressure may be determined from the average value of the suction pressure for several banknotes.

In the banknote counting machine having the off-pressure adjustment function configured as described above, based on the suction pressure of a predetermined number of banknotes detected by the pressure sensor 11,
The off-pressure can be selected as appropriate from the table shown in the ROM 35 in Figure 5, or the off-pressure can be calculated as appropriate using a calculation formula. Changes in the rotational speed of the vacuum pump, (3) aging of the vacuum pump, (4) resistance generated locally due to dirt entering the piping system, and (5) air resistance generated in the area where vacuum pressure is generated on the suction shaft. Even if the suction level of banknotes fluctuates due to leakage, (6) atmospheric pressure changes when used at high altitudes, etc., it can be effectively dealt with, thereby improving banknote counting accuracy. This has the effect of being able to achieve this goal.

"Effects of the Invention" As explained in detail above, according to the present invention, the off pressure is determined based on the adsorption pressure detected by the pressure conversion element, so It is possible to effectively cope with changes in suction pressure due to changes in the rotational speed of the vacuum pump, etc., and thereby the bill counting accuracy can be improved.

[Brief explanation of drawings]

1 to 7 are diagrams showing the present invention, in which FIG. 1 is a functional block diagram thereof, FIG. 2 is a diagram showing the relationship between bill suction pressure and off pressure, and FIG. 3 is a bill counting diagram. FIG. 4 is a front sectional view of the bill counting machine shown in FIG. 3, FIG. 5 is a block diagram showing the off-pressure adjustment circuit, and FIG. 6 is a flowchart showing counting control. , FIG. 7 is a diagram showing the relationship between the output of the pressure conversion element, the rotary cylinder position sensor, and the counting timing and time. 11...Pressure sensor (pressure conversion element), 34...
...Off pressure adjustment circuit (off pressure adjustment means, counting end determination section), (off pressure setting section), (off pressure calculation means). 3
5...ROM (off pressure information storage unit).

Claims (1)

[Scope of Claims] 1. In a banknote counting machine that counts banknotes loaded in a holder while suctioning them to a suction shaft and turning them over one by one, pressure conversion detects the suction pressure of the suction shaft when the banknotes are sucked. an off-pressure adjustment means that determines an off-pressure that is a criterion for determining whether or not there is a banknote to be adsorbed on the suction shaft, based on the adsorption pressure detected by the pressure conversion element; When the suction pressure detected by the pressure conversion element falls below the off-pressure determined by the off-pressure adjustment means, stopping the drive of the suction shaft,
1. A banknote counting machine having an off-pressure adjustment function, characterized by comprising a counting end determination section for terminating banknote counting. 2 The off-pressure adjustment means includes an off-pressure setting section that selects one of a plurality of off-pressures stored in advance in an off-pressure information storage section based on the adsorption pressure detected by the pressure conversion element. A bill counting machine having an off-pressure adjustment function according to claim 1, characterized in that the bill counting machine is constructed as follows. 3. The off-pressure adjusting means is characterized by comprising an off-pressure calculation means that calculates the off-pressure based on the adsorption pressure detected by the pressure conversion element according to a certain calculation law. A banknote counting machine having an off-pressure adjustment function according to claim 1.