JPH087488Y2 - Paper sheet counting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a paper sheet counting machine, and is particularly used for counting the number of bills and the like.

[Prior Art] As one of the paper sheet counters that have been proposed so far, the vacuum pressure inside the suction shaft that revolves around the axis of revolution revolves around the bills as they are picked up and picked up, and the passage of the suction shaft is detected. There is known a bill counting machine that counts bills according to the output signal of the proximity switch. In this type of paper counting machine,
It is generally necessary to keep the suction head and the rotor to which it is attached stationary in place at the start. This is because when the suction head is not stopped at a fixed position, the suction surface of the suction head is not in close contact with the paper sheets, so that outside air flows in and the inside of the suction head reaches a certain vacuum pressure. This is because it is not possible to adsorb paper sheets.

Therefore, as a means for stopping the rotor at a fixed position,
For example, a locking groove corresponding to a fixed position is provided on the outer peripheral surface of the rotor, and a stopper that engages with the locking groove is provided. There is a method of stopping the rotor at a fixed position engaged with, or a method of driving the stopper at the end of the counting operation to stop the rotor at the fixed position.

[Problems to be solved by the device]

However, in the conventional device in which the suction head and the rotor are stopped at the fixed position in this way so that the suction head can surely adsorb to the paper sheet at the start of counting, this fixed position always attaches a new paper sheet to the holder. It is determined by the correspondence between the positions of the paper sheets and the suction head at the time. Therefore, when the actual counting is performed, the attachment of the paper sheets to the holder is not always standard, or there are creases on the paper sheets, the degree of fatigue or damage, and the difference in the types of paper sheets. ,
In some cases, the optimum position of the suction head with respect to the paper sheets actually attached to the holder does not match the fixed position determined as a standard in advance. In such a case, despite the fact that the suction head and rotor are in the fixed position at the start of counting,
There is a problem that the suction head is difficult to adsorb the paper sheets and cannot be adsorbed without using a fairly powerful vacuum pump.

The present invention has been made to solve such a problem, and provides a paper sheet counting machine capable of surely adsorbing paper sheets without being affected by deterioration of the paper sheets themselves or a mounting state. The purpose is to provide.

[Means for solving the problem]

According to the present invention, a rotor that rotates about an axis, and a paper sheet that is provided on a circumference of a predetermined radius on the rotor and revolves around the axis while rotating about its axis and is in a counting position by the internal vacuum pressure. Suction head for adsorbing sheets one by one, a holder for holding paper sheets to be counted and moving to the counting position, a vacuum pump for reducing the internal pressure of the suction head, and the suction A vacuum switch that is turned on when the internal pressure becomes equal to or lower than a predetermined pressure due to the close contact between the head and the paper sheets, and a counting operation of the paper sheets corresponding to the turning operation of the paper sheets by the suction head. In a paper sheet counter including counting means, a driving means for rotating the rotor at least at two speeds of low speed and high speed, and the suction head at the counting position at the start of counting, vacuum Rotated at high forward rotation of said rotor by said driving means when the switch is in the ON state,
And a control means for temporarily rotating the rotor at a low speed under the drive condition when the vacuum switch is in an off state, and at a high speed for the condition that the vacuum switch is in an on state. Is characterized by.

[Action]

The on / off state of the vacuum switch is constantly monitored,
When the suction head and the rotor cannot suck the sheet even though the suction operation is performed at the fixed position, the suction head and the rotor are rotated at a low speed in the forward direction, and the position of the suction head is set to the holder. Even if it is a vacuum pump with a small suction force, it can be sucked by shifting the paper sheet little by little, and when the suction head securely sucks the paper sheet, the suction head and the rotor are rotated at high speed. I try to start counting paper sheets. Therefore, reliable adsorption and counting are possible.

〔Example〕

FIG. 4 is a perspective view showing a configuration of a paper sheet counting unit to which the present invention is applied.

Five suction heads 7 are rotatably attached to a support plate 8 which is rotationally driven by a belt 18 and a rotary plate 9. The suction head 7 has a hollow interior, and a plurality of pores 13 are provided on the suction surface. The inside of the suction head is decompressed by a vacuum pump (not shown). The suction head 7 is adapted to rotate along with the rotation (revolution) of the support plate 8. A position detection plate 10 is attached to the support plate 8, and a cutout 12 is provided in the position detection plate 10 in correspondence with the suction head position.
Reference numeral 12 is adapted to be detected by the detector 11 which is composed of a photo interrupter.

The bill A to be counted is mounted on the holder 2 having the rotatable bottom plate 4, and then pressed against the holder side wall by the spring-loaded pressing rod 6. At the time of counting, the holder 2 is rotationally biased so as to approach the suction head. In addition,
In order to detect the mounting state of the banknotes in the holder 2, the light emitter 14
Also, a detector including the light receiver 14a is provided.

FIG. 1 is a block diagram of a control unit that controls such a paper sheet counting unit.

The operation signal from the operation switch 21 is an I / O port on the CPU 20
The calculation result is input via 22 and is applied via the I / O port 25 to the holder motor 31, which drives the holder 2, the rotor motor control means 50, and the vacuum pump 43. The rotor motor control means 50 controls the rotation of the rotor motor, and the vacuum pump 43 drives the rotor and the suction head 42. The vacuum switch 60 determines whether the suction head is performing the correct suction operation, and the counting means 70 counts the bills.
The rotor position is detected by the rotor position detection means.
80 respectively, and the result is C through I / O port 26
Captured by PU20. The CPU 20 has a ROM 23 and a RAM 24, and performs control based on the operation timing and sequence of each unit stored in these.

Next, the operation of the device of the present invention will be described with reference to the flowchart of FIG. 2 and the timing chart of FIG.

(1) Setting First, when the paper sheet A is loaded into the holder 4, the pressing rod 6
The paper sheets are pressed against the holder wall by the press, and then the start switch is pressed (FIG. 3 (a)), the holder motor is driven and the holder is rotated to a predetermined suction position (step S1, FIG. 3). (B)).

(2) Prevention of defective installation of paper sheets Next, by rotating the rotor / motor at low speed,
The rotor is reversely rotated at a low speed (S2, (Fig. 3 (g)).) When the fixed position detecting means 11 detects the notch 12 which is a detected element provided in the rotor (S3, Fig. 3 (j)). )),
The brake is applied to stop the rotor at a fixed position (S4, Fig. 3 (i)). As will be described later, the rotor remains stationary at the fixed position even before the low speed reverse rotation operation, and the notch 12 is provided corresponding to the position of the suction head 7, so that the suction head 7 is separated by one interval by this operation. This means that the reverse rotation operation is performed, so that it is possible to prevent a failure in setting the paper sheets in the holder, such as bills entering between the suction heads.
The low-speed reverse rotation operation of the rotor may be performed while the paper sheet holder is being mounted.

(3) Suction operation It has been confirmed that by the operations up to this point, the paper sheets are securely attached to the holder and the holder is closed (Fig. 3 (e)). In addition, the rotor is stopped at a fixed position (3rd
For the sake of illustration (j), the suction surface of the suction head 7 provided on the rotor should normally be in close contact with the sheet A. Therefore, if the vacuum pump is operated at this time (FIG. 3 (k)), the inside of the suction head can be kept at a constant vacuum pressure (S5). Note that the vacuum pump may be started from an earlier point in time, in which case the suction of the paper sheets will start from this point.

When the inside of the suction head 7 reaches a certain vacuum pressure, the vacuum switch detects this and outputs a detection signal indicating that the vacuum switch is ON (S6, FIG. 3 (l)). In this state, the sheets are ready for counting, and the next counting operation is started (FIG. 3 (m)).

On the other hand, if the vacuum switch remains off even after the vacuum pump is started, the specified time, for example 500 ms
When it was confirmed that the vacuum switch did not turn on even after the passage of time (step S21, FIG. 3 (j)), it was judged that the fixed position did not match the optimum position for adsorption, and the rotor The motor controller rotates the rotor motor at a low speed in the forward direction (step S22, FIG. 3 (g)). As a result of the low-speed forward rotation of the rotor, the position of the suction head gradually shifts with respect to the paper sheets. It has a constant vacuum pressure. Therefore, it is monitored whether or not the vacuum switch is turned on (step S23, FIG. 3 (l)). When the vacuum switch outputs a detection signal indicating ON, the sheets are ready for counting in this state.

The state of the vacuum switch after the low speed rotation is monitored for a predetermined time (step S24, FIG. 3 (j)). If the vacuum switch does not turn on after the predetermined time has elapsed, the rotor is rotated at that time. It stops (step S26), and waits for a predetermined time sufficient to stop while monitoring the state of the vacuum switch (step S27). If the vacuum switch is turned on during this period, the next counting operation starts at that point. However, if the vacuum switch is not turned on even after waiting for a predetermined time, an error display indicating that the suction operation of the paper sheets has failed is performed, and the resetting of banknotes is instructed (step S28).

(4) Counting operation On condition that the vacuum detection signal of the vacuum switch is ON in each of the steps S6, S23, and S26 described above, the rotor / motor control unit rotates the rotor / motor at high speed to rotate the rotor / motor. At high speed (S7, FIG. 3 (f)) and start counting (S8, FIG. 3 (m)).

Hereinafter, as the suction head 7 attached to the rotor is sucking and turning the sheets one after another according to the rotation of the rotor, the notches 12 of the passing rotor are counted, and the sensor 11 detects the notch 12 and detects the detection signal. Paper sheets can be counted by counting.

(5) Stopping operation After counting all the paper sheets, there is no paper sheet to be sucked by the suction head, and the outside air enters into the suction head through the suction hole 13. Therefore, the vacuum pressure cannot be maintained inside the suction head, and the vacuum switch is turned off (S9,
Fig. 3 (l)). Also, when performing batch counting,
When the counting of a predetermined number of batches is completed, the batch stopper operates and the paper leaves the suction head 7, so that the vacuum switch is turned off in the same manner. This vacuum switch is off
When it becomes, the counting is finished (S10, FIG. 3 (m)). The vacuum pump is stopped (S11, FIG. 3 (k)), and the stop operation is started. At this point, the rotor motor controller
The rotor / motor is switched from high-speed forward rotation to low-speed forward rotation, and the rotor is set to low-speed forward rotation (S12, FIG. 3 (f) (g)).
In this case, in order to ensure that the rotor motor changes from high speed rotation to low speed rotation, a predetermined time (S1
3). When the fixed position detection sensor 11 detects the notch 12 (S14, FIG. 3 (j)) after the predetermined time has elapsed and the low speed rotation is surely performed, the rotor / rotor is detected by the detection signal.
Apply DC braking to the motor (S15, Fig. 3 (i)). As a result, the rotor is stopped at the fixed position.

Next, the operation of the rotor / motor control circuit will be described with reference to FIG.

FIG. 5 is a circuit diagram showing a detailed configuration of the rotor motor control means 50. A speed control circuit 51 for adjusting the rotation speed of the rotor / motor, a motor drive control for controlling the rotation direction of the rotor / motor and the brake. The circuit 52 and transistors Q1 to Q7 for supplying current to the motor M are the main components.

The speed control circuit 51 adjusts the output voltage thereof and adjusts the amount of current flowing to the motor by the npn type transistor Q6 and the pnp type transistor Q7. That is, when rotating at a low speed, the output voltage of the speed control circuit 51 is reduced to reduce the current flowing through Q7. On the other hand, when rotating at high speed, the output voltage of the speed control circuit 51 is increased to increase the current flowing through Q7. The rotor motor is equipped with a sensor 53 for detecting a rotation speed, and the detection signal Sv is fed back to maintain an accurate rotation speed.

As a method of controlling the speed of the rotor / motor, the output of the speed control circuit 51 may be a pulse signal and the duty ratio thereof may be changed to adjust the amount of current flowing through Q7.

Forward / reverse rotation / brake of the rotor / motor is performed by controlling ON / OFF of bridge-connected pnp transistors Q1 and Q2 and npn transistors Q3 and Q4 by a motor drive control circuit 51. That is, in normal rotation, the transistors Q1 and Q4 are turned on and the transistors Q2 and Q3 are turned on.
Set to FF. When reversing, the transistors Q2 and Q3
Is turned on and the transistors Q1 and Q4 are turned off. When applying the brake, turn on the transistors Q3 and Q4 and turn off the transistors Q1 and Q2.

The rotor / motor control can be realized by combining the above high-speed / low-speed control with the forward / reverse / brake control.

Further, as described above, since the function of feeding back the rotational speed is provided, the rotation can be surely started. That is, for example, when the belt is difficult to move due to low temperature, it does not rotate at the time of rotation start or rotation failure is likely to occur.In such a case, increase the current flowing in Q6 and Q7 in the speed control circuit to a value higher than usual. The rotor motor can be rotated.

Also, the pnp-type transistor Q5 and the resistor R1 connected to the power supply Vcc are the overcurrent protection circuit of the rotor motor,
When the amount of current flowing through R1 exceeds the set value, transistor Q5
Is ON and Q5 is OFF when the value is less than the set value, and operates so that the current above the set value does not flow to the rotor motor.

In the above embodiment, the brake was performed as part of the motor control by the motor control circuit, but a mechanical electromagnetic brake,
A disc brake or the like can be used.

Further, although the notch is used in the embodiment for detecting the position of the suction head, other means can be used as long as the positions correspond.

Further, in the above-described embodiment, the suction operation is performed at a fixed position as shown in FIG. 6, and the rotor motor is rotated at the low speed forward rotation when the paper sheet cannot be sucked. The maximum value of the displacement (displacement position P, Q) as shown in Fig. 6 in consideration of the displacement between the suction position and the optimum suction position.
At the shift position P, which is the opposite direction of the rotation direction of the sheet, the suction operation is first performed, and when the sheets cannot be sucked, the rotor
The motor may be rotated at a low speed.

[Effect of device]

As described above, in the present invention, since the optimum position of the suction operation of the paper sheet does not match the predetermined fixed position, the suction head and the paper sheet do not come into close contact at the start of counting and the vacuum switch is turned on. Even when such a situation does not occur, the suction head and the roller are once rotated at a low speed in the forward direction, so that suction can be reliably performed. Further, since the suction operation is easier than in the conventional case, the vacuum pump can also be sucked by a small vacuum pump having a small suction force, so that the counter itself can be made smaller and lighter.

[Brief description of drawings]

FIG. 1 is a block diagram showing the construction of a paper sheet counter according to the invention, FIG. 2 is a flow chart showing the operation of the device of the present invention, FIG. 3 is a timing chart of the operation, and FIG. FIG. 5 is a circuit diagram showing the configuration of the rotor / motor control means used, FIG. 5 is an enlarged perspective view showing details of the rotor portion, and FIG. 6 is a plan view showing another embodiment of the present invention. 2 ... Holder, 7 ... Suction head, 8 ... Support plate, 10 ...
… Rotating plate, 11 …… Detector, 12 …… Notch, 20 …… CPU, 4
3 ... Vacuum pump, 50 ... Rotor motor control means, 51 ...
… Speed control circuit, 52… Motor drive control circuit, 60…
… Vacuum switch, 70 …… Counter, 80 …… Rotor position detector.

Claims (1)

[Scope of utility model registration request] 1. A rotor which rotates about an axis, and a paper sheet which is provided on a circumference of a predetermined radius on the rotor and revolves around the axis while rotating about its axis to be in a counting position by an internal vacuum pressure. A suction head that sucks and flips the sheets one by one, a holder that holds the paper sheets to be counted and moves to the counting position, a vacuum pump for reducing the internal pressure of the suction head, and the suction head And a vacuum switch that is turned on when the internal pressure becomes equal to or lower than a predetermined pressure due to the close contact with the paper sheet, and a counting operation for counting the paper sheet corresponding to the turning operation of the paper sheet by the suction head. A paper sheet counter comprising: means for rotating the rotor at least in two speeds, a low speed and a high speed; and the suction head at the counting position at the start of counting, When the switch is in the ON state, the drive means rotates the rotor at a high speed in the forward direction, and when the vacuum switch is in the OFF state, the rotor is once rotated at the low speed in the forward condition. A sheet counting machine, comprising: a control unit for rotating the high-speed forward rotation on condition that the vacuum switch is turned on.