JPH0124668Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a flowchart in a paper sheet counting machine that automatically switches to flow abnormality detection processing corresponding to the type of paper sheets even when the type of paper sheets handled changes. This invention relates to an abnormality detection circuit.

2. Description of the Related Art In general, paper sheet counting machines include banknote counting machines used in banking operations and paper sheet counting machines that count various types of paper such as voting papers for elections. All of these paper sheet counting machines feed out a group of paper sheets fed into the paper sheet counting machine one by one into the paper sheet conveying device using the sheet feeding device, and the paper sheets fed into the sheet feeding device are By counting the number of paper sheets, the number of paper sheets in the input paper sheet group is counted. However, it is extremely difficult for such a sheet counting machine to reliably separate and take out a single sheet from a group of sheets that have been input. A passage detector installed in the conveyance path through which the sheet taken out passes detects the passage time of the sheet, and based on this detection result, the length (or width) of each sheet passing through the conveyance path is measured. ,
Flow abnormality detection that determines whether the paper sheet whose passage was detected by the passage detector is two or more sheets conveyed in a chain, based on the length data (or width data) obtained as a result. A circuit is provided. In the case of a flow abnormality detection circuit installed in such a sheet counting machine, a passage detector installed in the conveyance path outputs an output every time the type of sheet group input into the sheet counting machine changes. The length data obtained based on the length of the passage detection signal (the length of the period during which the passage detection signal is output) and the predetermined standard length data (this standard length data is usually measured by a timer). It is necessary to change the reference length data of the comparator that compares the length (set by etc.).

By the way, in the case of conventional flow abnormality detection circuits, the operator directly changed the reference length data supplied to the comparator provided in the flow abnormality detection circuit, so When changing the type, the number of operations required by the operator increases, and input errors by the operator may result in incorrect counting of sheets.
Further, there are other inconveniences such as having to measure the length of the group of paper sheets to be fed in advance to obtain necessary length data.

In view of the above points, this invention automatically sets the standard length data corresponding to the type of paper sheet even when the type of paper sheet to be input is changed, thereby making it possible for the operator to It is possible to reduce the number of operating procedures and prevent troubles caused by input errors by the operator.
This provides a flow abnormality detection circuit in a paper sheet counting machine that can eliminate the need to measure the length of a group of paper sheets being input, and detects when a sheet in a group of paper sheets that has been input passes through a predetermined position on the path of the same sheet. a length detecting means for detecting the length of the paper sheet when the length of the sheet is detected; a storage means for capturing and storing length data obtained by the length detecting means at a predetermined time; and a length stored in the storage means. Based on the data and the length data obtained by the length detecting means each time the paper leaf passes through the length detecting means, the paper sheet whose length is detected by the length detecting means is correctly detected. and discriminating means for discriminating whether or not the predetermined paper sheet has been fed out,
The present invention is characterized in that an abnormal flow of paper sheets is detected based on the determination result.

An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a sheet counter using the circuit of this invention. In this figure, 1 is a hopper on which a large number of paper sheets are accumulated. The paper sheets accumulated in the hopper 1 are sequentially passed through the slit 1a by a guide roller 2 and supplied to a feed roller 3. The feeding roller 3 is driven by a counting motor M1.
A clutch (not shown) for transmitting rotation between the feeding roller 3 and the counting motor M1 and a brake (not shown) for abruptly stopping the feeding roller 3 are provided. There is. Friction members 3a and 3b are provided at positions facing the feed roller 3, and the difference in frictional force between the feed roller 3 and the friction members 3a and 3b allows the paper sheets accumulated in the hopper 1 to be sequentially moved intermittently. It is supplied to the conveyance path 4 in a consistent manner. In this conveyance path 4, light emitters and receivers 5a and 5b for counting paper sheets are installed in the conveyance path 4.
They are placed opposite each other in between. The paper sheet passing through the conveyance path 4 reaches the acceleration roller 6 after its passage is detected by the light emitters and receivers 5a and 5b.
The accelerating rollers 6 are rotationally driven by the counting motor M1, and the paper sheets clamped by these accelerating rollers 6 are accelerated and fed into the collecting wheel 7. Accumulation car 7
is rotated in the direction of arrow B by a stacking wheel motor (not shown), and stacks the sheets on the bill tray 8 while arranging the sheets that have been sequentially accelerated and thrown in. The presence or absence of the paper on this bill tray 8 is detected by the transmitter/receiver 9.
a, 9b.

On the other hand, although not shown in the figure, on the front right side of the sheet counting machine, there are input means 17, which will be described later, at the bottom, namely a count button, an add button, a preset button,
A repeat button, a start button, a stop button, a numeric keypad, a light button, a clear button, etc. are provided, and above them there is a display means 18 (to be described later), i.e., a count display. A display for displaying the number of repeats and a light amount setting display are respectively provided. These displays may be 7-segment LED, LCD, plasma displays, or
It consists of a dot matrix type display such as a CRT.

Figure 2 is a block diagram showing an example of the circuit of this invention configured using a CPU system.
FIG. 3 is a flowchart for explaining FIG. 2. In FIG. 2, the CPU 10 executes a program to be described later, and is connected to an address bus.
It is connected to each ROM 11, RAM 12, keyboard and display I/O port 13, timer 14, output port 15, and input port 16 via AB, data bus DB, and control bus CB.

The keyboard and display I/O port 13 is connected to each pressed button when each button of the input means 17 provided at the lower right side of the front panel of the sheet counting machine shown in FIG. 1 is pressed. Generates a signal corresponding to and sends it to the CPU 10, and vice versa,
Various display data supplied from the CPU 10 are temporarily stored, and the temporarily stored display data is decoded and sequentially sent to the display means 18 for display.
Note that the display such as the number of sheets displayed by the display means 18 is suppressed to zero to make it easier to see.

When the timer 14 is supplied with a timing start signal from the CPU 10, it erases the clocking data stored up to that point and starts its timing operation, and when it is later supplied with a timing end signal from the CPU 10, At the same time as finishing the timekeeping operation, the timekeeping data obtained as a result of the timekeeping is stored, and the stored timekeeping data is supplied to the CPU 10. Note that this timer 14 also starts timing in parallel with the above-mentioned operation when a timing start signal is supplied from the CPU 10, and when a predetermined period of time has elapsed from the time when this timing started.
An interrupt signal is supplied to the CPU 10 to indicate that the clock start signal has not been supplied for a predetermined period.
It is designed to notify CPU10.

The output port 15 is connected to a counting motor M1 that drives the guide roller 2, feed roller 3, and acceleration roller 6 shown in FIG. A clutch biasing solenoid that connects (or disengages) a clutch that is provided coaxially with the roller 2 and transmits the driving force generated by the counting motor M1 to the guide roller 2 and the feed roller 3; A brake energizing solenoid is installed coaxially to activate the brake mechanism that stops the feed roller 3 and the guide roller 2, and a buzzer circuit installed in the sheet counting machine and generates a long buzzer sound and a short buzzer sound. The corresponding counting motor drive signal, accumulating car motor drive signal, clutch energizing solenoid drive signal, brake energizing solenoid drive signal, long sound generation signal, and short sound generation signal are respectively supplied, and the double detection circuit 19 is Provides double detection level data. That is, when the output port 15 receives a counting motor drive start signal from the CPU 10, it supplies a counting motor drive signal to the counting motor M1 to energize the counting motor M1 and drive the acceleration roller 6 to rotate. In this case, when the clutch biasing solenoid is in operation, the accelerating roller 6, the guide roller 2, and the feeding roller 3 are also rotationally driven. In addition, the output port 15 is
When an accumulating car motor drive start signal is supplied from the CPU 10, an accumulating car motor drive signal is supplied to the accumulating car motor to energize the accumulating car motor and rotationally driving the accumulating car 7. Also, output port 15
When supplied with a clutch drive start signal from the CPU 10, the controller supplies a clutch energizing solenoid drive signal to the clutch energizing solenoid to energize the clutch energizing solenoid and bring the clutch into the connected state. As a result, when the counting motor M1 is generating driving force, the driving force generated by the counting motor M1 is transmitted to the guide roller 2 and the feeding roller 3, and this transmitted driving force causes the guide roller 2 and the feeding roller The roller 3 is rotationally driven. Also, output port 15 is the CPU
When a brake drive start signal is supplied from 10, a brake energizing solenoid drive signal is supplied to the brake energizing solenoid to energize the brake energizing solenoid and put the brake in an operating state. As a result, the feed roller 3 and the guide roller 2 are braked and stopped. In addition, when the output port 15 receives a long sound generation start signal from the CPU 10, it supplies the long sound generation signal to the buzzer circuit to generate a long buzzer sound, and conversely, the short sound generation start signal is sent from the CPU 10. is supplied, a short tone generation signal is supplied to the buzzer circuit, and the buzzer circuit generates a short buzzer tone. Also, output port 15 is CPU1
When double detection level data is supplied from 0, the supplied double detection level data (or the double detection level data obtained as a result of decoding the supplied double detection level data) is sent to the double detection circuit. Supply to 19.

A double detection circuit 19 detects whether or not two or more sheets of paper passing through the conveyance path 4 are being conveyed in an overlapping manner based on a transmitted light amount signal that reaches the light receivers 5b and a reference corresponding to one sheet of paper. Detection is performed by comparing the transmitted light amount signal, and the double detection level data supplied from the output port 15 is converted into corresponding analog data (reference transmitted light amount signal).
It comprises a DA converter and a comparator that compares the magnitude of the reference transmitted light amount signal obtained by the DA converter and the transmitted light amount signal supplied from the light receivers 5b, 5b. And this double detection circuit 1
9 outputs a double feed detection signal when the transmitted light amount signal supplied from the light receivers 5b, 5b is smaller than the reference transmitted light amount signal obtained as a result of converting the double detection level data supplied from the output port 15. occurs,
This generated double feed detection signal is input to port 16.
supply to.

When the input port 16 is supplied with a double feed detection signal from the double detection circuit 19, it generates an interrupt signal and supplies it to the CPU 10, and detects when two or more sheets passing through the conveyance passage 4 overlap. In addition, the input port 16 inputs the transmitted light quantity signal supplied from the light receivers 5b, 5b to a predetermined size (this size means that the light reaching the light receivers 5b, 5b does not reach the paper sheet). When the magnitude of the transmitted light quantity signal output by the light receivers 5b, 5b is set to be slightly smaller than the magnitude of the transmitted light amount signal when the light is not attenuated by
When the transmitted light quantity signal from b, 5b becomes larger than a predetermined magnitude, a passage detection end signal is supplied to the CPU 10. The same input port 16 also sends a paper sheet to the CPU 10 when another input, that is, a transmitted light amount signal from the light receiver 9b for detecting the presence or absence of a paper sheet on the bill tray 8 becomes smaller than a predetermined level. Provides detection signal.

The ROM11 stores programs based on the flowchart described below, and also
The RAM 12 serves as a work area for programs stored in the ROM 11. Note that tolerance data d ₁ and d ₂ , which will be described later, are stored in advance in this RAM 12.

In the above configuration, the operator of the sheet counting machine turns on the power switch (not shown) provided on the sheet counting machine, and then sets the group of sheets to be counted into the hopper 1 of the sheet counting machine. When the start button of the input means 17 is pressed (step 1 in Fig. 3), the keyboard and I/O
The O port 13 generates a start signal corresponding to the pressed start button, and this causes the CPU 1 to
0 becomes operational, and each part of the device starts its operation. That is, when the start button provided on the input means 17 is pressed, the CPU 10 first supplies a counting motor drive start signal and an accumulating car motor drive start signal to the output port 15. As a result, the counting motor M1 and the accumulating car motor are
Each starts rotating and drives the accelerating roller 6 and the accumulating wheel 7 to rotate. After that, the CPU 10 inputs the preset double detection level data (or the light button and numeric keypad of the input means 17).
Newly input double detection level data) and a clutch drive start signal are supplied to the output port 15. As a result, the double detection circuit becomes capable of double detection, and both the guide roller 2 and the feed roller 3 rotate in the direction of arrow A, and the sheets in the group of sheets placed in the hopper 1 are sequentially conveyed. aisle 4
Send to. In addition, in parallel with the operation described above,
The CPU 10 erases a predetermined counting register in the CPU 10 (this register stores the number of sheets counted) (step 2 in FIG. 3),
Perform initial settings for counting operation. In this state, the sheet of paper conveyed through the conveyance path 4 is placed between the light emitting and receiving devices 5a and 5 which are disposed opposite to each other across the conveyance path 4.
When the light begins to pass between the light receivers 5b and 5b, the amount of light that reaches the light receivers 5b and 5b decreases.
The level of the transmitted light amount signal outputted by 5b decreases. As a result, the double detection circuit 19 determines the magnitude of the transmitted light amount signals from the light receivers 5b, 5b based on the double detection level data supplied from the output port 15, and as a result, double feeding is detected. In this case, a double feed detection signal is supplied to the input port 16. The input port 16 performs predetermined processing such as interrupting the CPU 10 when a double feed detection signal is supplied from the double detection circuit 19, and also performs predetermined processing such as interrupting the CPU 10, and also inputs the voltage of the transmitted light amount signal from the light receivers 5b, 5b. A passage detection start signal is generated and supplied to the CPU 10 based on the fact that the detection signal has decreased. CPU10
When supplied with the passage detection start signal from the input port 16 (step 3 in FIG. 3), it generates a time measurement start signal and supplies the generated time measurement start signal to the timer 14. When the timer 14 is supplied with the time measurement start signal from the CPU 10, it erases the previous time measurement data stored up to that point (in this case, the previous time measurement data is zero data or undefined data) and starts its time measurement operation. Start (Step 4 in Figure 3). And after this,
The CPU 10 reads the count data stored in the count register that has been initialized (in this case, the count data previously stored in this register has been erased due to the initial setting), and 1 is added to this read count data and stored in the count register again (step 5 in FIG. 3). After this, when the paper sheet being conveyed in the conveyance path 4 finishes passing between the light emitters and receivers 5a and 5b, the level of the transmitted light amount signal output from the light receivers 5b and 5b increases, and as a result, , an input port 16 supplies a passage detection end signal to the CPU 10. When the CPU 10 is supplied with the passage detection end signal from the input port 16 (step 6 in FIG. 3), it generates a time measurement end signal and the timer 14
supply to. When the timer 14 is supplied with the timing end signal from the CPU 10, it finishes the timing operation that was being performed up to that point (step 7 in Figure 3), and also uses the timing data obtained as a result of timing (this counting data is the standard (becomes length data)
Supplies to CPU10. The CPU 10 captures and stores the clock data supplied from the timer 14, reads the count data stored in the count register, and determines whether the read count data is 1 (step 8 in FIG. 3). ),As a result,
Since the read counting data is 1, the stored timing data is stored in a register at a predetermined location in the RAM 12 (hereinafter referred to as this register).
(referred to as _R1 ) (step 9 in Figure 3). Then, when the next paper sheet conveyed through the conveyance path 4 begins to pass between the light emitters and receivers 5a and 5b, and the level of the transmitted light amount signal output from the light receivers 5b and 5b decreases, the CPU 10 performs the above-mentioned process. Repeat the operation (operations from step 3 to step 7 in FIG. 3). After that, the CPU 10 reads the count data stored in the count register,
It is determined whether the read count data is 1 or not (step 8 in FIG. 3). As a result, since the read count data is not 1, the time measurement data from the timer 14 stored at that time ( This timing data becomes the paper length data) in the RAM 12.
(hereinafter, this register will be referred to as Rn) at a predetermined location (step 10 in FIG. 3). After that, the same CPU10
The tolerance data d ₁ stored in the RAM 12 and the reference length data stored in the register R ₁ of the RAM 12 are read, and the read tolerance data d ₁ and the reference length data are added. , stores the resulting upper limit length data, then reads the length data stored in the register Rn of the RAM 12, and combines this read length data with the stored upper limit length data. (Step 11 in Figure 3), and as a result, if the read length data is larger than the stored upper limit length data, that is, if a chain flow occurs, the predetermined Error stop processing, for example, outputs a clutch drive stop signal, brake drive start signal, etc. to the output port 15 to stop each part of the device, and supplies an error display signal to the keyboard and display I/O port 13 for display. The means 18 is caused to display an error (step 12 in FIG. 3).
In addition, in the case described above, if the read length data is smaller than or equal to the stored upper limit length data, the CPU 10 reads the tolerance data d ₂ stored in the RAM 12 and the same RAM 12.
At the same time as reading the reference length data stored in _the register R ₁ of Later on,
The length data stored in register Rn of RAM 12 is read, and the read length data is compared with the stored lower limit length data (step 13 in Figure 3). If the length data is smaller than the stored lower limit length data, that is, if a torn ticket (paper sheet) is detected, the predetermined error stop process described above is performed (step 12 in Figure 3). ), or conversely, if the read length data is greater than or the same as the stored lower limit length data, check whether the keyboard and display I/O port 13 are outputting a stop signal. Determine (Step 14 in Figure 3).
And I/O port 1 for keyboard and display
3 is outputting a stop signal, that is, when the operator presses the stop button of the input means 17 provided in the sheet counting machine, the CPU 10 performs a predetermined counting end process, for example, A counting motor drive stop signal, an accumulating car motor drive stop signal, etc. are output to the output port 15 to stop each part of the device (steps in Figure 3).
15), and conversely, keyboard and display I/O
When the port 13 is not outputting a stop signal, the CPU 10 performs the operations described above (operations from steps 3 to 8 and steps 10 to 10 in FIG. 3) based on step 3 described above.
15) repeatedly. Note that in step 3 described above, if the timer 14 outputs an interrupt signal while the CPU 10 is in the waiting state, the CPU 10 stops the waiting state and performs the counting end process in step 15. ing.

Furthermore, in this embodiment, the tolerance data d ₁ ,
Assuming that d ₂ is stored in RAM 12 in advance,
The allowable error of each sheet is determined while counting the group of sheets fed into the sheet counter, and each of the determined allowable errors is displayed on the display means 18 during the counting operation or after the counting operation is completed. , based on each permissible error data or maximum permissible error data displayed by this display means 18, or based on predetermined permissible error data,
Of course, it is also possible for the operator to input the tolerance data. Also, instead of RAM12
It may be stored in the ROM 11 in advance.

In addition, since this embodiment is provided with a double detection circuit 19, the double feed detection can be performed in parallel with the above-mentioned sheet length detection, and more accurate counting can be performed. .

FIG. 4 shows the configuration of the circuit shown in FIG. 2 organized by function. Hereinafter, the functions of each processing means will be explained in accordance with the flowchart of FIG.

In this figure, 20 is a main control unit that controls the entire apparatus, 21 is a sheet counting means having a counter, etc., and 22 is a light emitter/receiver 5 in FIG.
paper sheet detection means, 23, comprising: a, 5b;
is a timing means configured with a re-trigger timer;
Reference numeral 24 denotes an AND gate; 25, comparison data storage means comprising a register, a data latch circuit, etc.; and 26, the data written in the comparison data storage means 25 and the data supplied from the AND gate 24 to the reference data storage means 27. Comparison means 28 is a variation constant storage means for storing data for correcting variations in the data input to the comparison means 26.

These components have the following correspondence with the components of the circuit shown in FIG. 2, respectively.

That is, specifically, the main control section 20, the gate means 24, the comparison means 26
The functions of the CPU 10 are performed by the CPU 10, the number counting means 21, and the comparison data storage means 2.
5 and the reference data storage means 27 are performed by the RAM 12 under the control of the CPU 10, the light receiver 5b performs the function of the paper sheet detection means 22, and the timer 14 performs the function of the time measurement means 23.

Next, the functions of each of the above means will be explained again with reference to the flowchart of FIG.

S1: When the start button of the input means 17 provided on the front panel of the paper sheet counting machine shown in FIG. 1 is pressed, a counting start signal is generated and control is started.

S2: When the generated counting start signal is supplied to the sheet number counting means 21, the sheet number counting means 21 clears the number of sheets counted value that has been held up to then, and also calculates the number of sheets based on the output level of the light receiver 5b. The leaf detection means 22 determines the passage of a paper sheet, and the process proceeds to the next step S4 on the condition that the passage detection signal rises.

S4: When the passage detection signal rises,
The timer in the clock means 23 is cleared and timing starts.

S5: The sheet number counting means 21 counts up.

S6: The paper sheet detection means 2 detects that the paper sheet being conveyed in the conveyance path 4 has passed a predetermined position.
2 is detected and the passage detection signal falls, the process proceeds to the next step S7.

S7: The timer in the timer 23 is stopped by the fall of the passage detection signal.

S8: If the count value of the sheet number counting means 21 is 1, proceed to S9; otherwise, proceed to steps after S10.

S9: In counting the first sheet, since 1 is supplied from the sheet number counting means 21 to the AND gate 24, the time measurement data from the time measurement means 23 passes through the AND gate 24 and is supplied to the reference data storage means 27. Standard length R ₁
After that, the process returns to S3.

S10: When the second and subsequent bills pass, the count value of the bill counting means 21 will no longer be 1.
Proceeding to S10, the time measurement data measured by the time measurement means 23 is supplied to the comparison data storage means 25, and is stored as the length Rn of the second and subsequent sheets.

S11: The comparison means 26 compares the tolerance data d ₁ stored in the variation constant storage means 28 and the sheet length data R ₁ and Rn stored in both the storage means 25 and 27.
It is determined that Rn>R ₁ +d ₁ , and if YES, it is assumed that the length of the paper sheet is abnormal, and the process proceeds to S12, where the process ends with a predetermined error stop. On the other hand, in the case of NO, the process advances to the next step S13.

S13: Similarly, the comparing means 26 determines that Rn<R ₁ - d ₂ , and if YES, it is regarded as abnormal and proceeds to S12 as in the case of S11,
Terminates with an error stop. on the other hand,
If NO, it is determined whether a stop signal has been input (S14); if NO, the process returns to S3; if YES, the process proceeds to S15, and the control ends.

Note that the comparison means 26 is the comparison data storage means 2.
The above-described operation is repeated every time new length data is supplied from 5. Further, when the main control section 20 is supplied with an error stop signal from the comparison means 26, the main control section 20 performs a predetermined error stop process, for example, performs various parts of the device such as the guide roller 2, the feeding roller 3, etc. shown in FIG. A stop signal for stopping is output and supplied to each part of the apparatus, and an error display signal is supplied to a display (not shown) to display an error.

This circuit with the above configuration also operates in the same manner as the circuit shown in Fig. 2, and determines the length of the paper sheet passing through the conveyance path 4, and based on this determination result, there is an abnormality in the flow of the paper sheet. Perform detection.

In the above-mentioned embodiment, the length of the first sheet passing through the conveyance path 4 is stored as standard length data, so that when the first sheet flows in a chain, The second sheet of paper is determined to be a torn ticket and the circuit performs error stop processing. Therefore, even if the first sheet of paper flows in a chain, high counting accuracy can be maintained.

As explained above, this invention includes a length detecting means for detecting the length of a paper sheet in a group of input paper sheets when the sheet passes through a predetermined position in the passage of the sheet; storage means for capturing and storing length data obtained by the means at a predetermined time;
The length of the paper sheet is detected by the length detection means based on the length data stored in the storage means and the length data obtained by the length detection means each time the paper sheet passes the predetermined position. A discriminating means is provided for discriminating whether or not a sheet of paper that has been fed out is a predetermined sheet of paper that has been fed normally. Even when the type of paper sheet is changed, the standard length data corresponding to the type of paper sheet can be automatically set. Trouble can be prevented,
Furthermore, it is possible to eliminate the need to measure the length of the paper sheet group to be input.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of a paper sheet counter using the circuit of this invention, Figure 2 is a block diagram showing an example of the circuit of this invention configured using a CPU system, and Figure 3 is a diagram of the paper counter using the circuit of this invention. FIG. 4 is a flowchart for explaining the figure, and is a block diagram showing a case where the CPU system shown in FIG. 2 is classified and expressed by function. 10...CPU (discrimination means), 12...RAM (storage means), 14...Timer (length detection means), 20
... Main control section, 21 ... Sheet number counting means, 22 ...
Paper sheet detection means, 23... Time counting means, 24... AND gate (gate means), 26... Comparison means, 2
7... Reference data storage means, 28... Variation constant storage means.

Claims (1)

[Scope of utility model registration request] In a paper sheet counting machine that separates and feeds loaded stacked paper sheets one by one and counts the fed paper sheets by a sheet counting means, the separated paper sheets are separated in a direction along the paper surface. A sheet detecting means for outputting a passage detection start signal and a passage detection end signal each time a sheet passes through a specific point in a conveyance path, and a passage detection start signal and a passage detection signal supplied from the sheet detecting means. a clock means for detecting time data corresponding to the length of the passed paper sheet from a detection end signal; a reference data storage means for storing the time data measured by the time clock means; gate means that allows input of the time data into the reference data storage means only when the first paper sheet conveyed is counted;
The time data sequentially supplied from the timing means for the second and subsequent paper sheets conveyed through the conveyance path is compared with the data stored in the reference data storage means, and it is determined that the time data from the time measurement means is outside the permissible range. 1. A flow abnormality detection circuit in a paper sheet counting machine, characterized in that the circuit comprises a comparison means for outputting an error stop signal when the value is equal to the current value.