JP4176551B2 - Paper sheet take-out device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper sheet take-out device that separates paper sheets that have been input in a lump, such as mail and banknotes, and picks them up one by one.
[0002]
[Prior art]
For example, in a conventional paper sheet take-out device that separates paper sheets such as postal items and banknotes one by one, a feed roller that feeds the paper sheets in the transport direction, and a feed roller across the transport path A separation roller is provided that is disposed at the opposite position and rotates in the opposite direction to the feed roller to prevent a plurality of paper sheets from being fed out, and separates and transports the paper sheets. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP 2000-264489 A (first page, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the conventional paper sheet take-out device, the paper sheet is sandwiched between the above-described feed roller and separation roller, and the paper sheet is separated while these rollers are rotated in reverse to each other. That is, the paper sheets are separated by the difference in the friction coefficient between the feed roller and the paper sheets and the friction coefficient between the separation roller and the paper sheets, and the paper sheets are sent out in the conveying direction in which the feed roller rotates. At this time, since the separation roller functions as a brake for preventing the conveyance of the paper sheets, the separation roller is likely to be unevenly worn. When this uneven wear occurs, there is a problem in that taking out of paper sheets becomes worse, a conveyance abnormality occurs, and a determination abnormality occurs in the determination unit.
[0005]
Accordingly, the present invention can prevent abnormal conveyance of paper sheets by determining abnormal operation due to uneven wear of the separating roller and generating an abnormal signal when uneven wear exceeding the set value occurs. An object of the present invention is to provide a paper sheet take-out device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a feed roller that feeds a sheet to be transported along a transport path, and a surface of the feed roller that is in a position opposite to the feed roller with respect to the transport path. disposed Te, a separation roller for separating a plurality of the paper sheet one by one, a power source for rotating the separation roller in the direction opposite to the conveying direction of the feed roller, with the rotation of the separation roller The encoder outputs a signal, and the separation roller is rotated by the feed roller by rotating the feed roller in a state where the separation roller is not driven by the power source, and is output from the encoder along with the rotation. And a partial wear detecting means for calculating a signal and detecting the partial wear of the separation roller.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
FIG. 1 is a schematic sectional side view of a paper sheet take-out device according to an embodiment of the present invention. The paper sheet take-out device according to the embodiment of the present invention includes a supply unit 10 that supplies the paper sheet 1, a feed roller unit 20 that feeds the paper sheets 1 accumulated in the supply unit 10, and the feed roller. A controller 30 that controls the section 20, a separation roller section 40 that separates the sheets 1 in order to transport the sheets 1 fed by the feeding roller section 20 one by one, and uneven wear as uneven wear detection means. It is comprised with the detection part 50. FIG.
[0009]
The supply unit 10 includes a backup plate 12 that accumulates the sheets 1, a rail 11 that moves the backup plate 12 in the direction of the arrow B in the figure, and a drive source (not shown) that moves the backup plate 12. .
[0010]
The feeding roller unit 20 feeds the paper 1 accumulated on the backup plate 12, a supporting member 22 that supports the feeding roller 21 and the motor 24, and the power of the motor 24. And a drive belt 23 for transmission to the motor.
[0011]
The controller 30 includes a motor driver that controls the rotational speed ω and the driving torque τ of the motor 24.
[0012]
The separation roller unit 40 is disposed downstream of the feeding roller 21 in the conveying direction in order to convey the paper sheet 1 fed by the feeding roller 21 in the direction indicated by the arrow A, and is indicated by a direction indicated by the arrow C (counterclockwise). And a separation roller 42 disposed at a position opposite to the feed roller 41. The separation roller 42 is arranged in the direction indicated by the arrow D (counterclockwise direction) in order to separate and convey the sheets 1 one by one when the sheets 1 are fed out by the feeding roller 21. This is a transport roller that rotates and rotates in the direction (arrow A ′ direction in FIG. 2) opposite to the paper sheet transport direction (arrow A direction in FIG. 2) by the feed roller 41.
[0013]
FIG. 2 is a diagram illustrating a state in which the paper sheet 1 is conveyed in the separation roller unit 40. As the feed roller 41 rotates in the direction indicated by the arrow C, the paper sheet 1a receives a force (Fa) in the direction indicated by the arrow A. Further, since the separation roller 42 rotates in the direction of the arrow D in the figure, it receives a force (Fa ′) in the direction of the arrow A ′ in the figure. That is, the paper sheet 1a receives both the force (Fa) in the direction of the arrow A and the force (Fa ') in the direction of the arrow A'.
[0014]
Here, the feed roller 41 and the separation roller so that the friction coefficient μa between the feed roller 41 and the paper sheet 1a and the friction coefficient μa ′ between the separation roller 42 and the paper sheet 1a satisfy the condition of the following expression (1). 42 roller surface material is set.
[0015]
μa> μa '(1)
By setting in this way, the paper sheet 1a is conveyed in the direction of arrow A in the figure. Further, the paper sheet 1a and the paper sheet 1b are separated by setting the friction coefficient μab between the paper sheet 1a and the paper sheet 1b so as to satisfy the condition of the following expression (2).
[0016]
μa> μab (2)
However, since the separation roller 42 rotates reversely to separate the paper sheet 1a and the paper sheet 1b, the surface of the separation roller 42 is always worn with the conveyance of the paper sheet 1, and the uneven wear state shown in FIG. It is easy to become.
[0017]
Next, the uneven wear detector 50 for detecting the uneven wear will be described with reference to FIGS. FIG. 3 is a diagram showing the connection of the uneven wear detector 50. The uneven wear detection unit 50 is connected to the A-phase pulse 51 and the B-phase pulse 52 output from the motor 43 with an encoder that drives the separation roller 42 of the separation roller unit 40. A B-phase pulse 52 is detected.
[0018]
FIG. 4 is a block diagram illustrating an internal configuration of the uneven wear detection unit 50. The uneven wear detector 50 receives the A-phase pulse 51 and the B-phase pulse 52 of the motor 43 with an encoder, detects the phase difference, and is connected to the change point detector 54 to obtain the obtained position. A counter 55 that converts the phase difference into a count value, a too short detection unit 56 that is connected to the counter 55 and determines the length of the calculated count value, and a too short detection unit 56 that is a too long detection unit The detection unit 57 includes an abnormality generator 58 that is connected to the too short detection unit 56 and the too long detection unit 57 and detects abnormality of the separation roller 42 based on the length determination.
[0019]
FIG. 5 is a timing chart for explaining the operation of the uneven wear detector 50. Hereinafter, the operation of the uneven wear detection process by the uneven wear detector 50 will be described for each step.
[0020]
In the first step, in order to detect uneven wear, the feed roller 41 is rotated at a constant speed, and is rotated without applying torque (no load state) to the separation roller 42 by this rotational force. That is, while the paper sheet 1 is being conveyed, a torque for rotating the separation roller 42 in the direction of the arrow D is applied, but in this step, a torque for rotating the separation roller 42 in the direction of the arrow D is not applied.
[0021]
The separation roller 42 is rotated by the rotational force of the feed roller 41, and an A-phase pulse 51 (see FIG. 5A) and a B-phase pulse 52 (see FIG. 5B) are output from the motor with encoder 43. .
[0022]
Here, the A-phase pulse 51 and the B-phase pulse 52 will be described.
[0023]
For example, when the separation roller 42 rotates at 10 rps, one rotation is 100 ms. When the resolution of the encoder is 1024 pulses per revolution, the period t _{1 of} one pulse is 97.7 μs according to the following equation (3) (see FIG. 5B). The pulses of this waveform have a phase difference of 90 ° and are output as an A-phase pulse 51 and a B-phase pulse 52.
[0024]
t ₁ = 100 ms / 1024 = 97.7 μs (3)
In the second step, the A-phase pulse 51 and the B-phase pulse 52 output from the motor 43 with encoder are input to the change point detector 54, and the rising or falling of each of the A-phase pulse 51 and the B-phase pulse 52 is detected. Change points are detected. Here, the phase difference t ₂ between the A-phase pulse 51 and the B-phase pulse 52 is detected.
[0025]
That is, the phase difference from the rising change point of the B phase pulse 52 shown in FIG. 5 (B) to the falling change point of the A phase pulse 51 shown in FIG. 5 (A), and the A phase pulse shown in FIG. 5 (A). phase difference from falling transition point of 51 to the rising change point of B-phase pulse 52 shown in FIG. 5 (B) corresponds to t _2.
[0026]
In particular, the phase difference t ₂ between the A-phase pulse 51 and the B-phase pulse 52 at no load is set to 90 ° (1/4 cycle), and the positions of the A-phase pulse 51 and the B-phase pulse 52 at this time are set. The phase difference t ₂ indicates the value of the phase difference t _2S in a standard state without uneven wear, and is 24.4 μs as shown in the following equation (4).
[0027]
t _2S = 97.7 μs / 4 = 24.4 μs (4)
In the third step, the phase difference t ₂ between the A-phase pulse 51 and the B-phase pulse 52 detected by the change point detector 54 is input to the counter 55. Counter 55 is at the reference clock 32 MHz, obtains the phase difference _{t 2} the counter to count FD.
[0028]
FD = t ₂ / T ₃₂
In _{particular, FD S = t 2S / T} 32 = 24.4μs showing a count value FD _S under standard conditions without uneven wear in the following equation (5) / 0.03125μs = 781 ·· (5)
T ₃₂ = 0.03125 μs: period of the reference clock 32 MHz.
[0029]
In the fourth step, the count value FD output from the counter 55 is output to the detection unit 56 and the detection unit 57 that are too short, and the length is determined. That is, the too short detection unit 56 compares the detection level LVS (first reference value) with the count value FD. The too long detection unit 57 compares the too long detection level LVL (second reference value) with the count value FD.
[0030]
Here, the too short detection level LVS and the too long detection level LVL will be described. Too short detection level LVS and the detection level LVL too long, is set based on the count value FD _S under standard conditions without uneven wear, for example the following equation using the ± 5% value (6), by (7) . That is, the short too detection level LVS uses 95% value corresponding to -5% of the count value FD _S. The detection level LVL too long, using a 105% value corresponding to + 5% of the count value FD _S.
[0031]
LVS = FD _S × 0.95 = 781 × 0.95 = 741 (6)
LVL = FD _S × 1.05 = 781 × 1.05 = 820 (7)
The reason why the ± 5% value is used is that the allowable take-out value and malfunction limit value expected by the paper sheet processing apparatus (not shown) on which the paper sheet take-out apparatus of the present invention is mounted are ± 5%. However, the present invention is not limited to this.
[0032]
The take-out allowable value refers to an allowable value of uneven wear with respect to the transport pitch because the transport pitch fluctuates due to uneven wear when the take-out device takes out and feeds out the paper sheet. The malfunction limit value is a limit value of partial wear that leads to malfunction due to the separation roller unit being unable to separate paper sheets and transporting a plurality of sheets.
[0033]
Here, when the count value FD is in the range of the following equation (8), the uneven wear value is a normal value, and when it is out of the range, an abnormality generator 58 issues an alarm as an abnormal wear value abnormality, for example.
[0034]
LVS ≦ FD ≦ LVL (8)
That is, the abnormality generator 58 determines that the length of the count value FD is determined by the too short detection unit 56 and the too long detection unit 57 and is within the range of the expression (8), the separation roller 42 is determined to be normal, If it is not within the range of equation (8), it is determined that there is an abnormal wear of the separation roller 42, and an alarm is issued to prompt the replacement of the roller.
[0035]
As described above, according to the above embodiment, the abnormal operation due to the uneven wear of the separation roller is determined in advance, and if the uneven wear exceeding the set value has occurred, an abnormal signal is generated, Abnormal conveyance of leaves can be prevented in advance.
[0036]
【The invention's effect】
According to the present invention, abnormal operation due to uneven wear of the separation roller is discriminated in advance, and an abnormal signal is generated when uneven wear exceeding the set value has occurred to prevent abnormal conveyance of paper sheets in advance. It is possible to provide a paper sheet take-out device that can handle paper.
[Brief description of the drawings]
FIG. 1 is a schematic sectional side view of a paper sheet takeout device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a state in which paper sheets are conveyed in a separation roller unit.
FIG. 3 is a diagram showing connection of a partial wear detection unit.
FIG. 4 is a block diagram showing an internal configuration of a partial wear detection unit.
FIG. 5 is a timing chart for explaining the operation of the uneven wear detector.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper sheet 10 Supply part 11 Rail 12 Backup plate 20 Feeding roller part 21 Feeding roller part 22 Supporting member 23 Drive belt 24 Motor 30 Controller 40 Separation roller part 41 Feeding roller 42 Separation roller 43 Motor 50 with encoder Uneven wear detection part 51 A Phase pulse 52 B phase pulse 54 Change point detector 55 Counter 56 Too short detector 57 Too long detector 58 Abnormality generator

Claims (5)

A feed roller for feeding the paper sheets are fed transportable along a transport path,
A separation roller that is disposed in contact with the surface of the feed roller at a position facing the feed roller with respect to the transport path, and separates the plurality of sheets one by one;
A power source that rotationally drives the separation roller in a direction opposite to the conveying direction of the feed roller;
An encoder that outputs a signal along with the rotation of the separation roller;
The separation roller is rotated by the feed roller by rotating the feed roller in a state where the separation roller is not driven by the power source, and a signal output from the encoder is calculated along with the rotation, and the separation is performed. An apparatus for taking out paper sheets, comprising: uneven wear detection means for detecting uneven wear of a roller . 2. The paper sheet take-out device according to claim 1, wherein the uneven wear detecting means rotates the separation roller in contact with the feed roller while keeping the rotation speed of the feed roller constant .   The encoder output signal is composed of a two-phase pulse signal, detects a phase difference between the two-phase pulse signals when the separation roller rotates, and the phase difference is within a preset reference value range. 2. The paper sheet take-out device according to claim 1, wherein uneven wear of the separation roller is detected based on whether or not. The uneven wear detecting means includes
Change point detecting means for detecting rising or falling of the two-phase pulse signal;
Counting means for counting the phase difference between the change points obtained by the change point detection means with a reference clock;
Discriminating means for discriminating uneven wear based on the count value obtained by the counting means;
4. The paper sheet take-out apparatus according to claim 3, further comprising an alarm generating means for generating an alarm when uneven wear is detected based on the determination result of the determining means. The discrimination means includes
The count value counted by the counting means is compared with first and second reference values set in advance,
5. The paper sheet take-out device according to claim 4, wherein the alarm generation means generates an alarm when the count value exceeds a range of the first and second reference values.

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