JPH0313146B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a paper sheet stacking device for stacking and storing paper sheets such as banknotes, and in particular, to a paper sheet stacking device for stacking and storing paper sheets such as banknotes. The present invention relates to a paper sheet stacking device that can be inserted into a paper sheet stacking device.

[Conventional example]

2. Description of the Related Art Conventionally, there is a device that uses an impeller having a plurality of blades as a device for sequentially accumulating paper sheets being carried out in a storage section thereof. This type of paper sheet stacking device holds paper sheets that are sequentially carried out between the blades of an impeller, and sequentially stacks the paper sheets in a storage section by rotation of the impeller.

In this type of paper sheet stacking device, in order to insert paper sheets between the blades, the speed of the impeller is increased or decreased according to the time when the paper sheets enter the impeller, and the paper sheets are placed between the specified blades. A method has been used in which the vehicle is plunged into the ground (see Japanese Utility Model Publication No. 160347/1983 and Japanese Patent Application Laid-open No. 65757/1983).

[Problem to be solved by the invention] In recent years, there has been a demand for high-speed processing of paper sheets in conventional paper sheet stacking devices. There is instability in the intake between the two.

An object of the present invention is to provide a paper sheet stacking device that can stably stack paper sheets at high speed.

[Means to solve the problem]

In order to achieve the above object, the paper sheet stacking device according to the present invention includes an impeller rotated by a pulse motor, and a plurality of impellers provided on the outer periphery of the impeller to receive paper sheets conveyed through a conveyance path. a control unit that controls the driving speed of the impeller to receive the paper sheets at a predetermined position between the respective blades, and a stop means that separates the paper sheets from between the respective blades. In the apparatus, two paper leaf passage detection sensors for detecting the passage of paper sheets are provided in the conveyance path orthogonally to the paper leaf conveyance direction, and the control unit is configured to control the control unit so that at least one of the paper leaf passage detection sensors detects the passage of paper sheets. Timing starts after the light is blocked by the tip of the leaf, and when the time it takes for the trailing edge of the leaf to pass through the two leaf passage detection sensors exceeds the set time, the impeller is decelerated to approximately the lower limit speed. The apparatus is configured to include means for driving the impeller at a standard speed after the trailing edge of the sheet passes through two sheet passage detection sensors.

[Effect]

According to the present invention, the paper sheets that are carried out at any timing are taken into the stable area (predetermined position) where the paper sheets can be stably taken in between the blades of the impeller, and the paper sheets are reliably placed in the storage section. Accumulate. That is,
A certain value of impeller rotation speed is selected based on the correspondence between the passing detection signal of the leading edge of the paper sheet at the impeller control reference point on the conveyance path and the initial phase of the impeller at this time, and the impeller is accelerated or decelerated. The entry phase at which the leading edge of the paper leaf enters the impeller was controlled to be located in the stable paper intake region, and then the impeller was driven at the standard rotation speed, and the length of the paper leaf was detected to be longer than the specified length. In this case, it is controlled to drive at the lowest speed.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, an impeller 21, which is a means for accumulating paper sheets B, is rotatably provided in the main body 1. This impeller 21 is provided with a plurality of blades 22 on its circumference. Impeller 21
is rotationally driven by a pulse motor 24 connected to its shaft 23. Near the outer periphery of the impeller 21,
Conveyance path 2 for inserting paper sheet B between blades 22
5 is provided, and a roller 25 is provided at the end of the conveyance path 25.
a, 25b are arranged. The stacking section 20 is provided with a stopper (stopping means) 26 for removing the sheet B inserted between the blades 22 of the impeller 21.

As shown in FIG. 2, two sheet passage detection sensors 27A and 27B for detecting the passage of sheet B are provided in the conveying path 25 at right angles to the sheet conveying direction (arrow). ing. The paper sheet passage detection sensors 27A, 27B detect a certain distance L (hereinafter referred to as "impeller" It is arranged on the conveyance path 25 in front (referred to as the vehicle control distance). The impeller control distance is set to be slightly smaller than the length of the sheet in the conveying direction. The installation positions of the sheet passage detection sensors 27A and 27B function as impeller control standards. This function will be described later.

A disk 29 having one light passage hole 28 is fixed to the impeller shaft 23 . A rotational phase detection sensor 30 for detecting the rotational phase of the impeller 21 is provided on the whole 1 near the disk 29. Impeller 2
1 and the disk 29, when the tip of the blade 22 is located at the impeller entry point A of the paper sheet B (impeller rotation phase θ=0), the rotation phase detection sensor 30
However, due to the light passing hole 28 of the disc 29, the output is
It is set to switch from OFF to ON.

The control circuit 31 includes a storage section 36 that stores a table of drive signals T (FIG. 4) for accelerating and decelerating the counter 35 and the impeller 21, and an interface section 34 that inputs and outputs signals. There is. The output from the control circuit 31 is input to the drive circuit 33, and the speed of the pulse motor 24 for driving the impeller is controlled. Note that the counter 35 is connected to the control circuit 31
A timer function is provided to output a standard speed drive command to the pulse motor 24 after the paper sheet B enters between the blades 22 (after a certain period of time has elapsed).

The counter 35 counts up the excitation pulses of the pulse motor 24, and one count corresponds to the number of pulses for the blade 2.
It is set as a value obtained by dividing the rotation angle θ between the two into 360 equal parts. The count value is logically cleared when it reaches 360, and is forcibly cleared every time the impeller rotates by the output of the rotational phase detection sensor 30.

When the paper sheet B is carried out from the conveyance path 25 while the impeller 21 is rotating at the standard speed, the paper sheet passage detection sensors 27A and 27B (hereinafter referred to as passage sensors) detect the leading edge of the paper sheet B. do. The timer is cleared at the moment the rising signal of the passing sensor is input to the control circuit 31 and starts counting time. At the same time, a drive signal T (specifically, the excitation frequency of the pulse motor) is selected from the table in FIG. 4 corresponding to the counter value at that moment, and this drive signal T is input to the motor drive circuit 33 to drive the impeller. is driven by acceleration and deceleration.

As shown in FIG. 4, nine driving speeds are set based on count values corresponding to the initial phase of the impeller. In this example, the stable sheet handling area (predetermined position) is set at 67° to 190°, with the angle between the blades 22 being 360°, as shown in FIG.

When the leading edge of the paper sheet B is detected in the range of classifications 1 to 3, it is driven by the drive signal T corresponding to each classification to take in the paper leaf between the blades 22a, and then
When the leading edge of the paper sheet B is detected in the range of 9 to 9, it is similarly driven by the drive signal T and the next blade interval 2 is detected.
2b will take in the paper leaf. (See Figure 1) The required movement phase is the phase that should be rotated in order to position the blade phase (the entry phase of paper sheet B) in the stable region when the leading edge of paper sheet B reaches the impeller entry point. ,
The frequency is the excitation pulse rate of the pulse motor 24 required at that time.

Here, FIG. 4 will be explained by taking an example.
Category 8 is a category in which the drive signal T is driven at a standard speed of 400pps, but the pulse motor is driven at a standard speed of 200pps.
The speed of the impeller is further reduced to 1/3, so the absolute angle θ at which the impeller rotates per second at 400pps can be found using equation (1).

θ=400/200×360゜×1/3=240゜ ...(1) On the other hand, the time required for the tip of the paper to reach the impeller entry point is Tc = 62.5m, as shown in Figure 2.
s, and the absolute angle θ' at which the impeller rotates during this period is determined by equation (2).

θ′=240°×0.0625=15° (2) In this example, the number of blades is 12, so the absolute angle between the blades is 30°, which corresponds to the counter value of 360°. Therefore, the absolute angle θ'=15° corresponds to the counter value of 180°, which coincides with the required movement phase of section 8 of 180°.

The maximum value of the initial phase in section 3 is 112°. In order to take in paper sheets at the maximum value of 190° in the stable region, the required movement phase is 190° - 112° = 78°, and the standard speed is reduced from 400pps to 175pps to be taken in between the current blades. Good. The drive frequency of 175pps is sufficiently higher than the pulse motor's resonant frequency of 100pps, so there is no risk that the pulse motor will step out. The maximum value of the initial phase in section 4 is 158°. If we consider the case where the sheet is taken between the current blades by decelerating the drive as in section 3 since it is within the stable region, the required movement phase will be 190° - 158° = 32°. From the relationship between the required movement phase and the drive frequency, for example, the deceleration drive frequency in this case is determined from the numerical value of Category 1: 325pps
×32°/146°=71pps. Therefore, the resonant frequency
Since it is less than 100pps and there is a risk that the pulse motor will step out, the speed is increased to 700pps as shown in Figure 4 to bring it into the stable region between the next blades.

In this way, no matter what timing the paper sheet B is taken out, it is possible to reliably take the paper sheet B into the stable area between the blades shown in FIG. 3.

Next, paper sheet B is conveyed by the conveyance path 25.
As shown by the two-dot chain line in FIG. 2, cases in which several sheets are conveyed in piles or diagonally conveyed will be explained.

Fig. 5 shows the contents of the time setting table, and Tc (certain time) is determined by the period of time when the leading edge of the paper sheet B passes at least one of the passing sensors 27A and 28B and reaches the impeller entry point A. The time required to reach the destination, Tl, is the standard time for the leading and trailing ends of the sheet B to shield the passage sensors 27A, 27B, that is, the time corresponding to the standard width of the sheet B in the transport direction, Td.
is the time of 2×Tl.

As described above, the timer is cleared by a rising signal from at least one of the passing sensors 27A, 27B, and starts counting. When Tc has elapsed, it is assumed that the leading edge of the paper sheet B has reached the impeller entry point A, and the impeller is driven at the standard speed (400 pps in this example), and timekeeping is continued to wait for Tl to elapse. When Tl elapses, two passing sensors 2
When the outputs of 7A and 27B fall, paper sheet B
Since the width is a standard value, the impeller 21 continues to be driven at the standard speed and waits for the detection of the next sheet B.

On the other hand, even after Tl has elapsed, the two passing sensors 27
If the output of A or 27B is in the rising (light-blocking) state, it will take longer than the standard value (set time) for paper sheet B (when two or more sheets overlap in the conveying direction or when skew conveying In this case, the drive speed of the impeller 21 is reduced to approximately the lower limit speed (the lowest value that can drive the pulse motor 24 without resonance, in this example, 40 pps), and after paper sheet B After the end passes the two passing sensors 27A and 27B, the output is waited for to fall, the impeller drive speed is changed to the standard speed, and the next sheet of paper is waiting for detection. In this case, even if the time of 2×Tl, that is, Td has passed, the two passing sensors 27A and 27B
If B is not in the falling state, there is no paper sheet B on the conveyance path.
stagnates, it is determined that a jam has occurred, the device is stopped, and abnormality processing is performed.

As described above, when paper sheets are carried out in an overlapping manner or in a diagonal direction, time measurement is started after at least one of the passing sensors is blocked by the leading edge of the paper leaf, and when the trailing edge of the paper leaf is 2 When the time it takes to pass through several passing sensors exceeds the set time, the above
A counter 35 that decelerates the impeller to approximately the lower limit speed based on NAND judgment, and drives the impeller at the standard speed after the trailing edge of the sheet passes through two sheet passing sensors.
By providing a driving means consisting of a control circuit 31 having a storage section 36 and a motor drive circuit 33, it is possible to reliably insert paper sheets between the blades.

FIG. 6 is a flowchart showing the contents of the explanation described above.

〔Effect of the invention〕

According to the paper sheet stacking device of the present invention, even overlapping paper sheets or obliquely conveyed paper sheets can be stably taken in by the impeller, and paper sheets can be stably stacked at high speed. .

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure shows the arrangement of the sheet passage detection sensor shown in Fig. 1, Fig. 3 is an enlarged view of a part of Fig. 1, Fig. 4 shows the control table of the pulse motor, and Fig. 5 shows the settings. FIG. 6, which is a diagram showing a time table, is a flowchart explaining the control operation of the present invention. 21...impeller, 22...blade, 26...stopper (stopping means), 27A, 27B...sheet passage detection sensor.

Claims (1)

[Claims] 1. An impeller rotated by a pulse motor, a plurality of blades provided on the outer periphery of the impeller to receive paper sheets conveyed through a conveyance path, and a drive speed of the impeller controlled to control the driving speed between each blade. A paper sheet stacking device comprising: a control section for receiving the paper sheet at a predetermined position; and a stop means for removing the paper sheet from between the respective blades; two paper sheet passage detection sensors are provided perpendicularly to the paper sheet transport direction, and the control unit measures time after at least one of the paper sheet passage detection sensors is blocked by the leading edge of the paper sheet. When the time required for the trailing edge of the paper sheet to pass through the two paper sheet passage detection sensors exceeds the set time, the impeller is decelerated to approximately the lower limit speed, and the trailing edge of the paper sheet is A paper sheet stacking device comprising means for driving the impeller at a standard speed after the paper passes the two paper sheet passage detection sensors.