JPH0313145B2 - - 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, and with this high-speed processing of paper sheets, instability has arisen in the intake of paper sheets between the blades. ing.

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. The device is provided with a paper sheet passage detection sensor that detects the passage of paper sheets on the conveyance path, and the control unit compares the light blocking time of the paper sheet passing detection sensor with a set time, and when the light blocking time is longer than the set time, The apparatus is configured to include means for decelerating the impeller to approximately the lower limit speed and driving the impeller at the standard speed after the trailing edge of the sheet passes the sheet passage sensor.

[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 sheet enters the impeller is controlled to be in the stable paper intake area, and then the impeller is driven at the standard rotation speed, and when overlapping of paper sheets is detected, the minimum speed is set. After driving at speed, it is controlled to change to standard speed.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, 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. The impeller 21 is rotationally driven by a pulse motor 24 connected to its shaft 23. Near the outer periphery of the impeller 21, the paper sheet B is placed on the impeller 2.
A conveyance path 25 is provided for insertion between the two,
Rollers 25a and 25b are disposed at the end of the conveyance path 25. The blades 2 of the impeller 21 are installed in the accumulation section 20.
A stopper (stopping means) 26 is provided for removing the sheet B inserted between the two.

A sheet passage detection sensor 27 is provided in the conveyance path 25 to detect passage of the sheet B. This paper sheet passage detection sensor 27 detects a certain distance L from the impeller entry point A of the paper sheet B, where the leading edge of the paper sheet B carried out from the conveyance path 25 and the outer periphery of the impeller 21 match.
(hereinafter referred to as impeller control distance) front conveyance path 25
is placed on top. The impeller control distance is set to be slightly smaller than the length of the sheet in the conveying direction.
The installation position of the sheet passage detection sensor 27 functions as an impeller control reference. 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 in the main body 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 unit 36 that stores a drive signal T table (FIG. 4) and a time setting table (FIG. 2) for accelerating and decelerating the counter 35 and the impeller 21, and a signal input/output unit. It has a built-in interface section 34 that performs the following. Control circuit 31
The output from the impeller is input to the drive circuit 33, and the speed of the pulse motor 24 for driving the impeller is controlled.

The counter 35 has a timer function in order to cause the control circuit 31 to output a standard speed drive command to the pulse motor 24 after the 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 sensor 27 (hereinafter referred to as a passage sensor) detects the leading edge of the paper sheet B. The moment the rising signal of the passing sensor is input to the control circuit 31, the timer is cleared and the clock is started. 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 blades The car 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 intake 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
If the leading edge of paper sheet B is detected in the range of
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 the paper sheet B) in the stable region when the leading edge of the 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.
Since the impeller is further decelerated to 1/3, 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° x 0.0625 = 15° (2) In this example, there are 12 blades, 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 degrees. 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 decelerated 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. Category 4
The maximum value of the initial phase of 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 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 Fig. 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.

FIG. 2 shows the contents of the time setting table, where Tc (certain time) is the time required from when the leading edge of the paper sheet B passes the passage sensor 27 until it reaches the impeller entry point A; Tl is the standard time during which the paper sheet B blocks light from the passing sensor 27, that is, a time corresponding to the standard width of the paper sheet B in the transport direction, and Td is the time of 2×Tl.

As described above, the timer is cleared by the rising signal of the passing sensor 27 and starts counting time. 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 rotated at the standard speed (in this example,
400pps) and continues to measure time.
is pending. If the output of the passage sensor 27 falls after Tl has elapsed, the width of the sheet B is the standard value, so the impeller 21 continues to be driven at the standard speed and waits for the detection of the next sheet B. Become.

On the other hand, if the output of the passage sensor 27 remains in the rising (light-blocking) state even after Tl has elapsed, the width of paper sheet B is longer than the standard value (set time) (two or more sheets are in the conveying direction). In this case, the drive speed of the impeller 21 is changed to the lowest value (lower limit speed) (the lowest value that can drive the pulse motor 24 without causing resonance, in this example, 40 pps). After waiting for the output of the passage sensor 27 to fall, the drive speed of the impeller is changed to the standard speed, and the process waits for the detection of the next sheet. In this case, if the passage sensor 27 does not fall even after the time of 2×Tl, that is, Td has elapsed, it is determined that the sheet B has accumulated on the conveyance path and a jam has occurred, and the apparatus is stopped. and perform abnormality processing.

As described above, if the paper sheets are carried out in an overlapping manner and the width thereof is longer than the standard value, the control circuit 31 drives the impeller 21 at the lowest speed for a time corresponding to the length exceeding the standard value. By providing the driving means consisting of the motor drive circuit 33, it is possible to reliably insert paper sheets between the blades.

FIG. 5 is a flowchart showing the above-mentioned explanation.

〔Effect of the invention〕

According to the paper sheet stacking device of the present invention, the stability of paper sheet intake by the impeller is improved, 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 a table of setting times, and Figure 3 is the first
FIG. 4 is a diagram showing a control table for the pulse motor, and FIG. 5 is a flowchart explaining the control operation of the present invention. 21...impeller, 22...blade, 26...stopper (stopping means), 27...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 of the impeller and create a space between each blade. A paper sheet stacking device comprising a control unit for receiving the paper sheet at a predetermined position of the paper sheet, and a stop means for removing the paper sheet from between the respective blades, detecting passage of the paper sheet on the conveyance path. A paper leaf passage detection sensor is provided, and the control unit compares the light blocking time of the paper leaf passing detection sensor with a set time, and when the light blocking time is longer than the set time, the control unit controls the impeller to approximately the lower limit speed. A paper sheet stacking device comprising means for decelerating the paper sheet and driving the impeller at a standard speed after the rear end of the paper sheet passes the paper sheet passage sensor.