JPH04125241A - Sheet delivery device - Google Patents

Abstract

PURPOSE:To eliminate a delay caused by a slip so as to control an acceleration to a maximum value even though the slip rate of a sheet varies, by detecting speeds of the sheet and a roller so as to calculated the slip rate, and by controlling the drive or the roller so that the slip rate falls in an optimum slip range. CONSTITUTION:There are provided a roller speed detecting means 24 for detecting the rotational speed of a roller 13, and a sheet speed detecting means 26 for detecting the speed of a sheet fed by the roller 13. A CPU 27 calculates a slip rate in accordance with outputs from both detecting means 24, 26, and accordingly, a speed control means 19 is controlled so that the slip rate falls in an optimum slip range.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention is used in banknote processing devices used in banking, printing machines, copying machines, etc. This invention relates to a paper sheet feeding device that feeds paper sheets one by one.

(B) Prior art The above-mentioned paper sheet feeding devices have conventionally been of the constant speed rotation type shown in FIG. 4 and the intermittent rotation type shown in FIG. 5.

To explain the constant speed rotation type paper sheet feeding device shown in FIG. (e.g. rubber, etc.)
A part of the outer periphery of the pick-up roller 4 is mounted on the bottom plate 3, and a part of the outer periphery of the feed roller 5 is mounted on the bottom plate 3. A gate roller 6 is mounted on the upper side of the feed roller 5 and is in contact with the upper part of the feed roller 5 to control the delivery of one sheet of paper 1. 5 are interlocked and connected by a belt 7 so as to rotate at a constant speed, and the shaft 8 of the pickup roller 4 is configured to be driven and controlled via a drive source and an electromagnetic clutch (not shown).

In addition, the intermittent rotation type paper sheet feeding device shown in FIG.
To explain using the above-mentioned part names and symbols, the pickup roller 4 is made of a material with a high friction coefficient, such as rubber, all around, and while the feed roller 5 rotates continuously, the pickup roller Reference numeral 4 is configured to send out the paper sheets 1 by intermittently driving and controlling another power system one by one using an electromagnetic clutch (not shown).

Note that other parts are similar to the configuration shown in FIG. 4.

(c) Problems to be Solved by the Invention However, in the paper sheet feeding device shown in FIGS. 4 and 5, in order to increase the feeding processing speed of the paper sheet 1, it is necessary to 4 must be increased, but if this speed is increased, a slip will occur between the pickup roller 4 and the paper sheet 1 at the beginning of acceleration of the paper sheet 1, and the driving force of the pickup roller 4 will be reduced. Both lateral forces have the problem of rapidly decreasing as shown in FIG.

Further, as the pickup roller 4 is used, if the friction coefficient μ decreases due to wear, dirt, etc., the above-mentioned slip increases more significantly.

As a result, the timing of feeding paper sheets becomes unstable,
The deviation of the feeding pitch may become large, or the disturbance force that applies a rotational moment to the sheet during feeding (for example,
If uneven low drag force is applied to the left and right sides of the guide, etc.),
Since the lateral force of the pickup roller 4 is low, there is a problem in that skew is likely to occur.

For example, in a banknote processing apparatus, these effects cause banknote jams and discrimination errors, and appear in a decrease in the reading rate of banknote discrimination.

Therefore, the present invention solves the above-mentioned problems by controlling the feeding of paper sheets so that the optimum slip area A is achieved as shown in FIG. It is an object of the present invention to provide a paper sheet feeding device that can prevent the skew of paper sheets and also correct the skew of paper sheets.

(d) Means for Solving the Problems The first aspect of the present invention comprises: a roller for feeding paper sheets; a roller speed detection means for detecting the rotational speed of the roller;
paper sheet speed detection means for detecting the speed of paper sheets sent out by the roller; speed control means for controlling the rotational speed of the roller; and calculating a slip rate based on the outputs of both of the detection means; The paper sheet feeding device is characterized in that it includes a control means for driving and controlling the speed control means so that the slip rate is in an optimum slip region.

A second aspect of the present invention provides a left and right independently driven roller for feeding paper sheets, a left and right roller speed detection means for detecting the rotational speed of the left and right rollers, and a paper sheet that is fed by each of the rollers. left and right paper sheet speed detection means for respectively detecting the left and right speeds of the paper sheets, left and right speed control means for separately controlling the rotational speed of each of the rollers, skew detection means for detecting the skew of the paper sheets, and the above-mentioned A slip rate is calculated based on each output of each speed detecting means, and each of the speed control means is drive-controlled so that the slip rate is in the optimum slip region, and the left and right speeds are controlled based on the output of the skew detecting means. The paper sheet feeding device is characterized in that it is equipped with a control means that independently controls the control means.

(E) Function The paper sheet feeding device of the first invention calculates the slip rate of the paper sheet based on the outputs of the roller speed detection means and the paper sheet speed detection means, and this slip rate is optimal. The control means controls the speed control means of the roller so that the slip ratio is within the range.

Further, the sheet feeding device of the second invention calculates the slip rate of the sheet based on the outputs of the left and right roller speed detection means and the left and right sheet speed detection means, and calculates the slip rate of the sheet based on the outputs of the left and right roller speed detection means and the left and right sheet speed detection means. The control means drives and controls the left and right speed control means of the roller so that the slip ratio is in the optimum slip ratio region, and also drives and controls the left and right speed control means individually based on the output of the skew detection means.

(F) Effects of the Invention As a result of the above, according to the present invention, the respective speeds of the paper sheet and the roller are detected, the slip rate λ of the paper sheet is calculated from these, and the slip rate λ of the paper sheet is calculated so as to be in the optimum slip area. By controlling the drive of the rollers, the following effects can be obtained.

That is, by applying a driving force commensurate with the slip ratio λ to the roller, the delivery delay due to slip can be eliminated, and even if the slip ratio λ changes, the acceleration can always be controlled to the maximum value (within the range of the slip ratio λ).

Furthermore, by ensuring the lateral resistance of the rollers, the stability of the skew of paper sheets can be improved.

Furthermore, the paper sheets may be soiled by the roller due to slipping (
black marks) can be prevented.

In addition, by independently controlling the drive of the left and right rollers, skew can be actively corrected, and the accumulated paper sheets can be
Even if the paper sheets are not aligned, the skew can be corrected and the paper sheets sent out.

(g) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a banknote dispensing device, and in FIG. 1, the entire circumferential surface is formed of a material with a high friction coefficient (such as rubber) on the upper surface side of a bottom plate 12 that stores banknotes 10 by pressing them with a pressing plate 11. A part of the outer periphery of the pickup roller 13 is exposed to support the pickup roller 13, and a part of the outer periphery of the feed roller 14 is placed on the bottom plate 12 on the banknote 10 delivery port side.
The feed roller 1 is mounted facing the upper surface side, and
4, a gate roller 15 is placed in contact with the roller 14 to control the delivery of one bill 10, and while the aforementioned feed roller 14 rotates continuously, the pickup roller 13 is driven by a separate power source. The banknote system is configured to send out the banknotes 10 by controlling the drive intermittently one by one.

The idle roller 16 is supported on a shaft so as to rotate when it comes into contact with the banknote 10 being sent out in order to detect the speed of the banknote.
The photoelectric sensor 17 detects the feeding of the banknote 10.

FIG. 2 shows a block diagram of a drive control circuit for the pickup roller 13. The output of the motor 19 is input to the drive shaft 18 bearing the pickup roller 13 via pulleys 20, 21, a belt 22, and a torque control clutch 23. Ru.

A pickup roller 13 is attached to the drive shaft 18 mentioned above.
Roller speed detection encoder 2 for detecting the speed of
4 is installed.

Further, a banknote speed detection encoder 26 for detecting the feeding speed of banknotes 10 is also attached to the rotating shaft 25 of the idle roller 16 described above.

The output signals of these encoders 24 and 26 and the output signal of the photoelectric sensor 17 for detecting the banknote 10 described above are input to the CPU 27.

The above-mentioned CPU 27 controls the delivery of the banknote 10 and calculates the slip rate λ of the banknote 10 in accordance with the program stored in the ROM 28, and controls the drive of the motor 19. Necessary data such as data (output values) corresponding to respective detection speeds from, the calculated slip ratio λ, and the number of bills 10 sent out are stored.

The target speed setter 30 sets the drive output value of the motor 19 corresponding to the standard speed of the pickup roller 13.
The amplifier 31 adds or subtracts the drive output value from the target speed setter 30 using the correction control value (output value) from the CPU 27, and controls the speed of the pickup roller 13 to the speed where the optimum slip region A shown in FIG. 6 is achieved. The drive output value of the motor 19 is controlled to be the same as that of the motor 19.

In the banknote feeding device configured in this way, when the required number of banknotes 10 to be fed is inputted to the CPU 27 via an appropriate input means, the motor 19 is operated at the standard output value set in the target speed setting device 30. The drive is controlled, and at the same time the feed roller 14 is also driven in the sending direction.

When the CPU 27 controls the torque control clutch 23 to remain ON for the time required to send out one banknote 10 and the pickup roller 13 rotates in the sending direction, the banknote 10
is sent out, and as the banknote 10 is sent out, the idle roller 16 also rotates.

Next, the CPU 27 reads output signals indicating the speeds of the roller speed detection encoder 24 and the bill speed detection encoder 26, and calculates the slip ratio λ.

That is, the slip rate λ= (VR-v)/VR However, VR is the speed of the pickup roller 13, and the banknote 1
Next, it is determined whether the calculated current slip rate λ is the optimum slip area A shown in FIG. 6. For example, if the slip rate λ is large, the rotation of the pickup roller 13 is reduced. A corrected control value that falls within the optimum slip region A is calculated, and this value is input to the amplifier to correct the drive output value of the motor 19 and drive the motor 19.

By controlling the drive of the motor 19 in this manner, the pickup roller 13 can send out the banknote 10 in the optimum slip area A, and the process of sending out the banknote 10 can be improved.

Note that the above-described correction is executed multiple times for feeding one bill, and the pickup roller 13 is controlled so that the drive is always in the optimum slip region A.

FIG. 3 shows another embodiment in which the pickup roller 13 mentioned above is divided into left and right parts and independently suspended so that the skew of the banknotes 10 can be corrected.

That is, each drive shaft 18a, 18b bearing each pickup roller 13a, 13b has each motor 19a, 19.
The output of b is the pulley 20a, 20b.

21a, 2ib, belts 22a, 22b,) are input via torque control clutches 23a, 23b.

Roller speed detection encoders 24a and 24b for detecting the speeds of pickup rollers 13a and 13b are attached to each of the aforementioned drive shafts 18a and 18b, respectively.

Further, banknote speed detection encoders 26a, 26b for detecting the feeding speed of the banknotes 10 are also attached to the rotating shafts 25a, 25b of the respective idle rollers 15a, 16b.

These encoders 24a, 24b, 26a, 2
6b and the output signals of photoelectric sensors 17a and 17b arranged on the left and right sides to detect the skew of the banknote 10 are input to the CPU 27.

The CPU 27 described above is the same as in the first embodiment, and controls the feeding of the banknotes 10 and calculates the slip rate λ of the banknotes 10 in accordance with the program stored in the ROM 28 to control the motor 19a. .

19b, and the RAM 29 stores data (output values) corresponding to the detected speeds from each encoder 24a, 24b, 26a, 26b, the calculated slip rate λ, the number of bills 10 to be delivered, etc. Store necessary data.

The target speed setter 30 sets the drive output value of the motors 19a, 19b corresponding to the standard speed of the pickup rollers 13a, 13b, as in the first embodiment described above, and the amplifiers 31a, 31b use the correction from the CPU 27. The drive output of the motors 19a, 19b is controlled by adding or subtracting the drive output value from the target speed setter 30 using the control value (output value) to control the speed of the respective pickup rollers 13a, 13b to the optimum slip area A. Control to value.

Furthermore, the comparison units 32a and 32b correct the difference in feeding due to the skew of the banknote 10.

When the banknote feeding device configured in this manner sends out the banknotes 10, the motor 19 is operated as in the first embodiment described above.
a and 19b are driven and controlled by the standard output value set in the target speed setting device 30, and at the same time the left and right feed rollers (first
(corresponding to 14 in the figure) is also driven in the delivery direction.

Each torque control clutch 23a, 23 is controlled by the CPU 27.
ON time required for b to send out one banknote 10 synchronously
When the pickup rollers 13a and 13b synchronously rotate in the feeding direction under the control of
When the banknote 10 is sent out, the left and right idle rollers 16a, 16
b also rotates.

Next, the CPU 27 uses the roller speed detection encoder 24a.
, 24b and the bill speed detection encoders 26a, 26b, and as in the case of the first embodiment described above, the respective pickup rollers 13a, 13b are read.
Calculate the slip rate λ.

It also reads output signals from the left and right photoelectric sensors 17a and 17b, determines the skew of the banknote 10 based on the output signals, and calculates a correction value for correcting the skew.

That is, the output difference between both sensors 17a and 17b is read, and this is divided into two to calculate a correction value such that the leading side of the skewed banknote 10 is sent out slowly (and the delayed side is sent out quickly). The left and right comparators 32a and 3
Correct each in 2b.

Next, the CPU 27 uses the roller speed detection encoder 24a.
, 24b and the bill speed detection encoders 26a, 26b, the respective slip ratios λ of the pickup rollers 13a, 13b calculated in the same manner as in the first embodiment described above are shown in FIG. If the optimum slip area A is not within the optimum slip area A, a correction control value that falls within the optimum slip area A is calculated for each pickup roller 13a, 13b, and these values are calculated for each pickup roller 13a, 13b. The signal is inputted to the amplifiers 31a and 31b to correct the drive output values of the respective motors 19a and 19b, and drive and control the respective motors 19a and 19b.

By independently driving and controlling the motors 19a and 19b in this way, the left and right pickup rollers 13a and 13b can feed out the banknote 10 in the optimum slip area A, and at the same time, it is possible to correct the skew of the banknote 10. Therefore, the processing for sending out the banknotes 10 can be improved.

Note that the above-described correction is also performed multiple times for feeding one bill 10, as in the first embodiment described above, to ensure that the drive of the pickup rollers 13a and 13b is always in the optimum slip region A. In addition, the skew of the banknote 10 is also controlled to be constantly corrected.

In addition, although the above-mentioned embodiment explained the delivery of banknotes, the present invention can also be used for the delivery of other paper sheets.

In the correspondence between the structure of this invention and the above-mentioned embodiments, the paper sheet of this invention corresponds to the banknote 10 of the embodiment, and the roller is the pickup roller 13.13a.

13b, the roller speed detection means is the roller speed detection encoder 2.
4, 24a, and 24b, the sheet speed detection means is as follows:
Bill speed detection encoder 26. 26 a, 26
Corresponding to b, the speed control means are motors 19.19a,
19b and amplifiers 31, 31a, and 31b, the skew detection means corresponds to the photoelectric sensors 17a and 17b, and the control means corresponds to the CPU 27, but the present invention is not limited to the configuration of the above-described embodiment. It's not something you can do.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, in which FIG. 1 is a schematic partial cross-sectional side view of a banknote feeding device, FIG. 2 is a block diagram of a drive control circuit for a pickup roller, and FIG. A block diagram of the drive control circuit for the pick-up roller in the example shown in FIG. It is. 10...Banknote 13.1.3a, 1.3b...Pickup roller 1
6.16a, ], 6b... Idle roller 17a, 1
7b... Photoelectric sensors 19.19a, 1.9b... Motors 24.24a, 24b... Encoders for roller speed detection 26, 26 a, 26 b... Encoder for bill speed detection 27... CPU 30.・・Target speed setting device 10・Paper rack 13・Bikkua ν propeller 16・Idle roller 17・Yu esenpu 1 1M chain 1?J side diagram Figure 2/Tsukuassive D-La HJ# circuit circuit diagram 99 Figure 10
・Maro 1 buttocks 16...Idol Roichira procedural amendment (voluntary) October 30, 1990

Claims (2)

[Claims] (1) A roller that sends out paper sheets, Roller speed to detect the rotational speed of the above rollers degree detection means; Speed of paper sheets sent out by the above rollers paper sheet speed detection means for detecting the Speed control to control the rotation speed of the above rollers means and Slip based on the output of both detection means above The slip rate is calculated and the slip rate is the optimum slip rate. Drive the speed control means above so that the area and a control means for controlling Paper sheet feeding device. (2) Left and right independently driven rollers that send out paper sheets; The left side detects the rotation speed of the left and right rollers above. Right roller speed detection means, The left side of the paper sheets sent out by each of the above rollers. Left and right paper sheets whose speeds are detected respectively on the right side speed detection means; Control the rotation speed of each of the above rollers separately. Left and right speed control means; Skew detection to detect skew in paper sheets means and Based on each output of each speed detection means mentioned above, Calculate the slip ratio and find out that the slip ratio is the optimal slip ratio. Each speed control hand above so that the lip area is In addition to controlling the drive of the stage, it also performs the above skew detection. Left and right speed control hands based on the output of the output means and control means for independently controlling the stages. Paper sheet feeding device.