JPH07137905A - Paper sheet checking device and paper sheet conveying device used therefor - Google Patents

Abstract

PURPOSE:To provide a paper sheet checking device wherein paper sheets can be stacked at high speed without increasing control torque of a motor and a paper sheet conveying device wherein the paper sheets can be transferred at high speed with its simple structure without generating wear to the paper sheets. CONSTITUTION:In a paper sheet checking device, a pitch between paper sheets 10 to be conveyed is detected by a detecting means on a conveying passage 20 and controlled by a control means so that the paper sheets may be inserted from the specific positions of grooves of rotational body impellers 41. Thereby, the suitable insertion to the rotational body becomes possible by making use of all paper sheet pitch information between respective paper sheets positioned on the conveying passage from a takeout part to a stacking part even if the pitch deviation is generated in taking-out or conveying of following paper sheets. In a paper sheet conveying device, a guide 23 wherein a specific gap is provided on a belt conveying surface is provided between rollers so as to face a belt 21 wound around the conveying rollers 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet inspection apparatus and a paper sheet inspection apparatus for detecting the damage of collected paper sheets, authenticity, etc., and re-collecting waste paper sheets and reused paper sheets. The present invention relates to a paper sheet conveying device suitable for a class inspection device.

[0002]

2. Description of the Related Art First, a conventional paper sheet inspection apparatus will be described. The paper sheet inspection device, the collected paper sheets that have been collected and carried in are continuously taken out at a fine pitch at the take-out section, and then, while being conveyed at a high speed by a belt, damage to the paper sheets,
A device that detects authenticity, determines whether each paper sheet can be discarded or reused, and then branches the transport path to re-collect waste paper sheets and reused paper sheets separately. Is. The waste paper sheets accumulated by this device are then shredded. The processing speed of the paper sheets of this inspection device is about 20 to 30 sheets / sec, and the transport speed is always constant at 8 m / s.

FIG. 18 shows the construction of a paper sheet conveying device used in a conventional paper sheet inspection apparatus. This paper sheet is conveyed by sandwiching it from above and below with flat belts 61 and 62 each having an independent drive source at two positions in the width direction and the conveyance surfaces of which are in close contact with each other. These belts are driven by a motor connected to drive rollers. In order to drive the belt at a high speed, those motors having a capacity of several hundred W are usually adopted.

As shown in FIG. 18, rollers are alternately arranged on both sides of the conveying path in order to secure the close contact of the belt. In such a configuration, since the upper and lower belts have a minute amount of speed difference, it is necessary to apply a frictional force to each other, which results in a large resistance of the transport system and a large force for driving the belt. To do. Further, although the belt runs while slightly swinging in the width direction, since the surfaces are in contact with each other, the belts may be separated from each other due to the influence of mutual swinging. Further, since the belt constantly presses the upper and lower surfaces of the paper sheet, the surface of the paper sheet is hidden, and the place for detection is limited.

FIG. 19 shows a transport mechanism adopted when transporting paper sheets at a lower speed. The paper sheet is sandwiched between the drive roller 71 and the roller 72, and the upper and lower guides 73 are arranged between the rollers. This method is mechanically compact and lightweight, but since the tip of the paper sheet is completely free between the guides, the tip of the paper sheet easily collides with the roller and is easily damaged. It has a drawback that it is not suitable for high-speed transportation of various kinds. In addition, there is a problem in that slippage occurs due to variations in the driving force generated by each roller due to external factors such as wear and dirt on the roller surface, resulting in different transport speeds of paper sheets between the rollers, and jamming is likely to occur. There is also.

The take-out section for sending the paper sheets to the conveying path is
It is composed of a rotor with a hole that performs intermittent rotation and a stationary chamber connected to a vacuum pump, and sucks paper sheets one by one from a stack of paper sheets stacked each time the rotor stops,
After being peeled off from the bundle, the sheets are put into the conveying system at a predetermined sheet pitch (a space between the front ends or the rear ends of the paper sheets conveyed adjacent to each other). A pitch error is caused little by little during this take-out, and the paper sheet having a minute pitch error is continuously carried to the carrying system.

FIG. 20 shows a schematic structure of a paper sheet stacking unit in a conventional paper sheet inspection apparatus. The paper sheet stacking unit is mainly composed of a stacking impeller 71. The integrated impeller 71 is a rotating body having spiral grooves equally distributed around the center thereof, and is belt driven by the stepping motor 74.
The conveyed sheets are stopped by being inserted into the groove, then scraped out from the groove, accumulated again, and delivered to the next processing.

Here, in order to prevent the paper sheet from being damaged due to a paper jam or a collision with a blade, it is necessary to ensure that only one sheet is surely inserted into one groove. That is, since the conveyed paper sheets have the pitch error as described above, the paper sheet accumulating unit absorbs the pitch error by using some means, and the paper sheet to the accumulating impeller 71 is absorbed. Need to ensure leaf insertion. Therefore, conventionally, one point at the groove entrance of the integrated impeller 71 is defined as the insertion point 75, and the tip of the paper sheet is controlled so as to reach the insertion point 75.

Next, a method of controlling the stacking unit in the conventional paper sheet inspection apparatus will be described. A photoelectric sensor 72 is arranged at a position that crosses the conveying path about 1 pitch away from the integrated impeller 71. When a paper sheet crosses this portion, the sensor output changes to detect the leading edge of the paper sheet. Be done. A rotary encoder 73 is connected to a motor 74 that drives the integrated impeller 71 so that the position of the rotating blade can be detected.

When the tip of the paper sheet reaches the optical path of the photoelectric sensor 72 and interrupts the light, the sensor output changes, and the controller (not shown) reads the value of the encoder 73 by using it as a trigger, and the integrated blade. The insertion position of the paper sheet into the groove when the vehicle 71 rotates at the standard rotation speed is predicted. At this time, if the paper sheet is displaced from the groove insertion point 75, control for correcting it is performed. That is, when the arrival position of the paper sheet is displaced forward of the insertion point 75 on the groove entrance, the rotation speed of the integrated impeller 71 is increased.
In the opposite case, the control unit controls the stepping motor 74 so as to reduce the rotation speed of the integrated impeller 71. In any case, the rotation speed of the integrated impeller 71 is determined so that the leading edge of the paper sheet coincides with the insertion point. This calculation operation is performed every time the paper sheet reaches the position of the photoelectric sensor 72, and the rotation speed of the integrated impeller 71 is constantly changed in order to correct the pitch error between the paper sheets. Therefore, the stepping motor 74 always needs a control torque for acceleration / deceleration.

The paper sheets taken out are continuously sent to the accumulating impeller 71. However, if the paper sheet pitch is not affected by disturbance during conveyance, the paper sheet pitch immediately after taking out the paper sheets is set. Will continue to hold. On the other hand, the integrated impeller 71
The positional relationship between the blades adjacent to each other in the groove is fixed and cannot be appropriately changed according to the paper sheet pitch. Therefore, for the i-th sheet, the integrated impeller 7
If you change the rotation speed of 1 and shift the insertion position,
It is the shift amount of the + 1st sheet with respect to the accumulated impeller 71. That is, if only the insertion position of the immediately preceding paper sheet is considered depending on how the paper sheet pitch varies, the amount of deviation with respect to the subsequent paper sheets becomes excessive, and as a result, the control amount of the integrated impeller 71, That is, since the control torque of the motor becomes excessively large, there is a possibility that the motor may lose its control and lose control. Especially when trying to speed up the device,
This problem is a major obstacle.

[0012]

In the conventional paper sheet inspection apparatus, when the processing speed of the paper sheets is increased, the control torque required for the stepping motor for rotating the integrated impeller is increased. The motor may get out of control and lose control. Therefore, the processing speed is limited by the control torque of the stepping motor, which is an obstacle to increasing the processing speed. For this reason, a high-speed and high-torque motor is required, but excessively increasing the capacity of the motor leads to an increase in size, weight, and cost of the device.

Further, in a conventional sheet conveying apparatus using a belt, belt detachment may occur, and in order to prevent it, it takes a long time to strictly adjust belt tension, roller inclination and the like. , Productivity is not good. In addition, the drive loss of the conveyor belt is large, and when attempting high-speed conveyance, the motor becomes huge and it is difficult to realize a small and lightweight structure. The roller transport system is also not suitable for high-speed drive because it easily damages paper sheets.

Therefore, an object of the present invention is to provide a paper sheet inspection apparatus capable of high-speed stacking without increasing the control torque of the motor for driving the stacking impeller.

Another object of the present invention is to provide a paper sheet conveying apparatus which is capable of high-speed conveyance with a simple structure and is less likely to cause damage to the paper sheets.

[0016]

A paper sheet conveying apparatus according to the present invention is provided with a conveying section for sequentially conveying a plurality of paper sheets and a plurality of grooves into which the paper sheets can be inserted. A paper sheet including a rotating body that receives the paper sheets conveyed through the set while rotating one by one in each of the grooves, and an accumulating section that accumulates the paper sheets inserted in the groove of the rotating body. In the inspection device, the detection unit that detects the pitch between the paper sheets conveyed on the conveyance unit, and the paper sheet is rotated based on the pitch between the paper sheets detected by the detection unit. It is characterized in that it is provided with a control means for controlling the insertion into a predetermined position of the groove of the body.

The control means may be a rotation speed control means for controlling the rotation speed of the rotator based on the pitch between the paper sheets detected by the detection means, and the transport section is provided in the middle thereof. And a conveying speed of the sheets in the sub-conveying unit based on the pitch between the sheets detected by the detecting unit. It is good to have a means to change.

Further, the control means stores the pitch between the paper sheets, an arithmetic means for performing a predetermined arithmetic operation, and the arithmetic means for performing the arithmetic operation to the rotating body of the paper sheets. And a mechanism control means for controlling the insertion of the.

Further, the paper sheet conveying apparatus according to the present invention includes a pair of rollers arranged at a predetermined distance, a belt suspended by the pair of rollers and wound around the rollers at a predetermined angle, It is arranged between a pair of rollers,
A driving unit that includes a guide member that is arranged at a constant distance from the surface of the belt that faces the roller, and drives the belt while sandwiching paper sheets between the roller and the belt. Is configured to convey the paper sheet.

A plurality of the transport units may be arranged so that the belt forms a substantially cylindrical surface having a center of curvature in the same direction.

[0021]

In the paper sheet inspection apparatus according to the present invention, the pitch between the conveyed paper sheets is detected by the detecting means on the conveying path, and the paper sheet is detected based on the detected pitch between the paper sheets. The control means controls so that the rotor is inserted from a predetermined position in the groove of the rotating body (impeller). By using all the paper sheet pitch information between the paper sheets located on the transport path, it is possible to insert the paper sheet into the rotating body appropriately.

In the aspect of controlling the rotation speed of the rotating body of the paper sheet inspection apparatus according to the present invention, the paper sheet of a certain paper sheet and the paper sheet immediately before it are referred to while referring to the paper sheet pitch information. When the class pitch is larger or smaller than the standard pitch by a certain amount or more, the drive system of the rotating body is accelerated and decelerated while the paper sheet is passing on the transport path of the sub-transport unit, and the paper sheet of the integrated impeller is Since the control is performed so that the integrated impeller is inserted into the predetermined insertion range, the increase amount of the control torque of the integrated impeller can be further reduced.

Further, in a mode in which the sub-conveying unit of the paper sheet inspection apparatus according to the present invention is adopted, the paper sheet of a certain paper sheet and the paper sheet immediately before the paper sheet are referred to while referring to the paper sheet pitch information. When the class pitch is larger or smaller than the standard pitch by a certain amount or more, the drive system of the sub-transport unit is accelerated or decelerated while the paper sheet is passing on the transport path of the sub-transport unit, By correcting the paper sheet pitch with other paper sheets, the variation of the paper sheet pitch is suppressed to a predetermined amount or less, and the paper sheets are controlled to be inserted into the predetermined insertion range of the stacking impeller. Therefore, the control torque increase amount of the integrated impeller can be further reduced.

Further, the paper sheet conveying apparatus according to the present invention is
A guide having a constant gap on the belt conveying surface is provided between the rollers so as to face the belt wound around the conveying rollers, and the conveying rollers are arranged so as to have a center of curvature in the same direction. Therefore, the belt generates a centrifugal force by high-speed conveyance to enhance the contact force between the paper sheet and the belt.
Therefore, the conveyance can be performed with an extremely small driving force. In addition, the number of belts can be reduced compared to the conventional example due to the structure, and the mechanism can be downsized. Further, the belt can be driven easily with high resistance and the motor can be driven at high speed easily, and the belt does not come off. Therefore, it is not necessary to adjust the tension of the belt and the inclination of the roller. Can be greatly shortened. Further, since one side of the paper sheet is constantly pressed against the conveyor belt by the centrifugal force, the paper sheet does not flutter and damage between the rollers. By adopting this structure,
It is possible to easily insert a mechanism for correcting (posture) skew of a sheet being conveyed, and it is possible to configure a more stable conveyance detection system.

[0025]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram showing the overall configuration of a paper sheet inspection apparatus according to the present invention. The paper sheet inspection apparatus has a configuration in which a take-out unit 1, a conveyance (detection) unit 2, a sorting unit 3, and a stacking unit 4 are arranged in order. The paper sheets 10 in a stacked state are carried into the apparatus by a carrying means (not shown), separated one by one by a take-out rotor 11, and put into a carrying path 20 constituting the carrying section 2. A detection unit (not shown) is arranged above the surface of the paper sheet 10 on the transport path 20 to check the paper sheets 10 one by one for damage and authenticity. The stacking unit 4 is divided into a recycled paper sheet stacking unit 4a and a waste paper sheet stacking unit 4b, and the transport direction of the paper sheet 10 is sorted according to the inspection result. This sorting is performed by the sorting gate 31 provided on the transport path 20. A stacking impeller 41 is provided in each stacking unit 4a, 4b to receive and stop the paper sheets 1 conveyed at high speed, and stack them again. The reused paper sheets are bundled by a post-processing unit (not shown) and carried out from this apparatus. On the other hand, the discarded paper sheets are sent to a disposal (shredder) processing unit (not shown).

Photoelectric sensors for checking the passage of the paper sheet 10 are provided at several locations on the transport path 20.
This photoelectric sensor is used for taking out the paper sheets 10, passing through the transport path 20, confirming insertion into the stacking unit 4, and calculating the paper sheet pitch. Here, the paper sheet pitch refers to a space between the front ends or the rear ends of the paper sheets conveyed adjacent to each other. Further, an abnormality of the paper sheet 10 on the transport path 20 (abnormality of paper sheet length, abnormality of paper sheet pitch, etc.) can be detected. In particular, the photoelectric sensor 51 disposed immediately after the take-out roller 11 is used to calculate the paper sheet pitch immediately after taking out the paper sheet 10, and by calculating this paper sheet pitch, an abnormality is detected. When a large paper sheet pitch occurs, the system can detect it promptly and take appropriate action.

FIG. 2 is a block diagram showing the configuration of the control system 100 of the paper sheet inspection apparatus according to the present invention. This control system is composed of a microcomputer or the like, and has a calculation unit 101 for performing various calculations, a storage unit 102 for storing paper sheet pitch data, which will be described later, and a drive motor 120 for a belt or the like based on the calculation result of the calculation unit. Drive control unit 1 for driving
Has 03. In addition, various sensors 11 are added to this control system.
An output signal of 0 is given, and after the format of the data is adjusted by the arithmetic unit 101, arithmetic operations and storage are performed.

FIG. 3 shows the construction of the take-out section, and FIG. 4 shows the way in which the paper sheet 10 is taken out. The take-out rotor 11 is a thin-walled roller having a suction hole 16 formed on the circumferential side surface, and is driven by a gear, a cam, or a servomotor at a position where the suction hole 16 faces the paper surface within one turn. Intermittent drive is performed so as to stop temporarily. A sealed stationary chamber 12 is fitted inside the take-out rotor 11, and is connected to an external vacuum pump 13. The space inside the chamber 12 is maintained at a negative pressure with respect to the atmospheric pressure by the vacuum pump 13, and the positions of the suction hole 16 of the take-out rotor 11 and the notch 17 of the chamber 12 are aligned at the stop position of the take-out rotor 11. Okeba (Fig. 4
(A) and (b)), when the take-out rotor 11 is stopped, the paper sheet 10 on the paper feed tray 14 is separated from the lower paper sheet bundle and sucked into the suction hole 16 (FIG. 4C). Then, when the take-out rotor 11 starts rotating (FIG. 4 (d)), the sucked paper sheet 10 is lifted along the side surface of the rotor, and when its tip is inserted into the transport path, the rotor remains as it is. It is transported away from the side surface. In this case, paper sheet 1
When 0 is sucked and the take-out rotor 11 starts rotating, the lower sheet bundle is slightly dragged due to the influence of frictional force,
The position may shift. Further, in order to prevent the double sheet picking, the back side of the passing sheet is weakly sucked by the double sheet picking block 15, the second sheet is stopped here, and is not inserted into the transport section. At the next take-out timing, the pick-up rotor 11 is sucked and conveyed.

FIG. 6 is a timing chart showing how the paper sheet pitch is detected. The detection of the paper sheet pitch is shown in FIG.
The signal of the photoelectric sensor 51 shown in FIG. The sensor output changes from the H level to the L level when the leading edge or the trailing edge of the paper sheet crosses between the photoelectric sensors 51, but the signal of the timer may be fetched by using this signal as a trigger. The time difference between the i-th captured timer value T _i and the i + 1-th captured timer value T _{i + 1} is the i-th sheet pitch P _i . The paper sheet pitch P _i is sequentially stored in the memory.

FIG. 7 shows a schematic structure of the integrated unit. The integrated impeller 41 is rotationally driven by the stepping motor 42. A rotary encoder 43 is belt-coupled to the motor shaft. The rotary encoder 43 monitors the rotational position of the integrated impeller 41, and the encoder output is given to a control unit (not shown).

FIG. 8 shows the structure of the integrated impeller. In this integrated impeller 41, 12 spiral grooves are arranged at equal angles on a cylinder. The width of insertion of the paper sheets into this groove is in the range of θ1 to θ2 at the central angle with reference to the blade tip of the integrated impeller 41. The setting position of the insertion width is determined in consideration of the sheet length, the sheet conveying speed, the number of splines, and the rotation speed of the impeller. That is, L / V <(360 / N-θ2) / W (1) is not satisfied when the paper length L, the paper conveyance speed V, the number of splines N, and the rotation speed W of the integrated impeller are set. Then, the paper sheet and the integrated impeller 41 collide with each other. Therefore, θ2 that satisfies the formula (1) should be selected. From the above, the insertion width is determined θ
1 and θ2 are determined in the range of 0 <θ1 <θ2 <(360 / N−L · W / V) (2). Furthermore, (θ1 + θ2) on the groove entrance
When the position of / 2 is the origin and θe = (θ2-θ1) / 2 (3), ± θe is the insertion width.

Returning to FIG. 7, on the side surface of the integrated impeller 41,
A bare board 44 is arranged. The paper sheets inserted into the stacking impeller 41 are aligned by the scraping plate 44, and the tips thereof fall along the scraping plate 44 along with the rotation of the blades and are stacked again.

An insertion detection sensor 45 is arranged around the integrated impeller 41. The insertion detection sensor 45 is a sensor including a light emitting portion and a light receiving portion, and changes in output when a sheet passes. When the insertion detection sensor 45 is arranged so as to cross the transport path slightly before the point where the paper sheet reaches the entrance of the integrated impeller 41, that is, the intersection between the transport path and the outline of the integrated impeller 41. , Paper sheet collection impeller 4
The insertion into 1 can be confirmed. Using the output of the insertion detection sensor 45 as a trigger, the rotary encoder 43
By reading the value of, the insertion position of the paper sheet at the groove entrance of the integrated impeller 41 can be detected. It is also possible to improve the control characteristics by feeding back the insertion position information and the rotation speed information of the integrated impeller to the control unit and changing the weighting coefficient of the evaluation function described later.

FIG. 9 is a flowchart showing how the control unit 100 controls the stacking unit. The stacking unit is controlled by a signal from the controller, and determines the rotational speed of the stacking impeller by using the information on each paper sheet pitch from the paper sheet immediately before the insertion to the paper sheets behind a plurality of sheets. This is intended to reduce the peak of the control torque of the stepping motor 42 that drives the integrated impeller 41, by using the arrangement of the sheets immediately before the insertion up to the sheet behind the plurality of sheets as the control information. .

As shown in FIG. 9, the take-out roller 1
It is detected that the output of the sensor 51 arranged immediately after 1 has changed from high to low (step S101), and the sheet pitch P _i is calculated from the time between the falls (step S102). The sheet pitches P _i , P _{i + 1,} ... After the i-th sheet thus obtained are stored in the memory.

The paper sheet is conveyed on the conveying path, and the photoelectric sensor 47 (see FIG. 8) arranged on the conveying path separated from the accumulating impeller 41 by about 1 pitch at the standard sheet pitch is the i-th sheet. When the passage of a class is detected, the controller reads the position of the blade of the integrated impeller 41 by the encoder 43 and determines the insertion position of the i-th sheet (step S).
104). The target insertion position of this paper sheet is a predetermined position within the insertion width described above. The sheet pitches already stored are read (step S105), the evaluation function described later is calculated (step S106), and the rotation speed of the integrated impeller 41 is determined so as to obtain an appropriate insertion position. (Step S107). The motor of the impeller is controlled so as to obtain this rotation speed (step S10).
8). In order to save the memory capacity, the paper sheet pitch data P _i between the inserted paper sheet and the paper sheet immediately after the insertion are sequentially erased from the memory 102.

Here, in addition to ensuring the insertion of the paper sheet, the insertion position of the paper sheet is determined so that the pitch deviation amount of the next paper sheet becomes as small as possible. This greatly contributes to the reduction of the control torque. Therefore, in the present embodiment, when determining the insertion position, for example, an evaluation function J represented by the following equation is obtained, and a control amount that minimizes the value of this evaluation function is selected.

J = (control amount) ² + Σ (variation amount of paper sheet pitch resulting from control) ² (4) Formula is created by expressing the parameters of the formula (4) by the insertion position (insertion angle) into the groove. To do. The insertion position of the i-th paper sheet when the integrated impeller 41 continues to rotate at the standard speed with respect to the insertion width ± θe determined by the above formula (3) is θ _i .
Assuming that the insertion position changes by θc due to the change of the rotation speed, it is necessary that the following is satisfied: −θe <θ _i + θc <θe (5), and the control amount θc is −θe−θ _i <θc <θe−θ. It must be in the range _i (6). As described above, each paper sheet pitch Pi is stored in the memory immediately after being taken out. Therefore, the controller of the stacking unit can know the position of the i-th and subsequent sheets from this, and θ at that time can be known.
_{i + 1} , θ _{i + 2} ... Can be calculated. Therefore, using this information for control, the evaluation function Ji of the i-th sheet insertion control is Will be expressed as The second term in the equation (7) is a weighted effect on the paper sheet behind the i-th paper sheet, and θc that minimizes Ji in the equation (7) is satisfied in the range satisfying the expression (6). By selecting, it is possible to perform the control in which the insertion is reliable and the rear sheets are taken into consideration. In the equation (6), C _k is a weighting coefficient of control for each sheet, and n is the predicted number of sheets used for control.

Here, there are various patterns of paper sheet pitch error, and it is difficult to always output the optimum control value for all patterns with a fixed coefficient. In order to obtain the best control result, it is necessary not only to minimize the control torque of the stepping motor that drives the integrated impeller, but also to reduce the variation in the insertion position of the paper sheets. As a measure for that, a fixed coefficient that allows optimal control as much as possible for all patterns of paper sheet pitch error, or change the coefficient for each pattern,
Optimal control can be considered. In the former case, for example, at the time of adjustment at the factory, a conveyance test of hundreds to tens of thousands of sheets is performed, and at the same time, the sheet insertion position is observed to insert the sheets into the stacking impeller. The coefficient of the evaluation function is determined so that the position does not vary most in the insertion width.
In the latter case, a large number of combinations of coefficients effective for various patterns of paper sheet pitch error are prepared, and pattern matching of paper sheet pitch error is performed when the paper sheet is movable,
Fine control is possible by selecting the coefficient of the evaluation function each time. In the latter case, application of fuzzy rules is effective. Further, a method in which a coefficient is changed while operating the device by using a method used in learning control such as a neural network or AI using a high-speed arithmetic unit is also conceivable. According to this method, it is possible to reduce the amount of adjustment in the initial stage, and it is possible to obtain a very good result over time.

FIG. 10 is a graph showing the effect of the integrated control system of the paper sheet inspection apparatus according to the present invention. Here, the symbols on the horizontal axis have the following meanings. N. C. Control only by position information of paper sheets just before insertion F. C. 1 Control by the pitch information from the sheet just before insertion to the back one sheet F. C. 2 Controlled by the pitch information from the sheet just before insertion to the back of two sheets F. C. 3 Control by pitch information from the sheet just before insertion to the back of three sheets F. C. 4 Control based on pitch information from sheets just before insertion to the back of four sheets Note that the control conditions when obtaining this result are as follows.

Processing speed 2500 sheets / min Number of impeller grooves 12 (30 °) Impeller rotational inertia 16 kg · cm2 Insertion width 7.5 ° Paper sheet conveying speed 12 m / s Paper sheet pitch error ± 6 ms (max) Random Occurrence In this way, it can be seen that the control torque of the drive motor decreases as the number of sheets of paper used for control increases. In this experiment, it has been confirmed that a sufficient effect can be obtained with 3 to 4 preview sheets.

As described above, according to the paper sheet inspection apparatus of this embodiment, when the paper sheets are inserted into the stacking impeller,
Since it is possible to reduce the control torque of the motor that drives the integrated impeller, it is possible to realize higher-speed conveyance of paper sheets.

FIG. 11 is a schematic block diagram showing another embodiment of the paper sheet inspection apparatus according to the present invention. In this configuration, the sub-transport unit 6 having the sub-transport path 61 disposed immediately after the take-out unit 1 is provided. This sub transport path 61 is
It has such a length that almost one sheet can pass through, and is independently driven by an AC servo motor 62 different from the main conveyance path. The controller accelerates or decelerates the sub-conveyance path 61 based on the sheet pitch information immediately after the take-out section 1. When the paper sheet pitch error immediately after the take-out section 1 becomes a certain value or larger, the paper sheet pitch correction is performed by the controller. When it is detected that the paper sheet pitch P _i is longer (shorter) than the standard pitch by a certain amount or more, the paper sheet is detected by the sub-conveyance path 61.
The AC servo motor 62 accelerates (decelerates) the conveyance from the point of reaching (1) to reduce the pitch error between the i-th sheet and the preceding sheet by a predetermined amount. The conveyance path length of the sub-conveyance path 61 is LD, the standard conveyance speed V of the paper sheet, and the AC servomotor 62 instantaneously changes the conveyance speed of the paper sheet in the sub-conveyance unit 2 to V.
Assuming that it has the ability to accelerate and decelerate from min to Vmax, the pitch correction width Pa can be calculated by the following equation. LD / Vmax-LD / V≤Pa≤LD / Vmin-LD / V (8) For example, the paper sheet insertion width converted into the paper sheet pitch error of the integrated impeller is ± 10% of the standard paper sheet pitch, and is taken out. Occurrence of paper sheet pitch error is ± 30% of standard paper sheet pitch
In this case, if the sub-conveyance unit 6 has a correction capability such that Pa becomes about + 10% of the standard paper sheet pitch, the integrated impeller may absorb + 10% by the fluctuation of the rotation speed. Become. However, if the sub-transport unit 6 does not exist, it is necessary to absorb an error of ± 20% due to the fluctuation of the rotation speed. In this way, by providing the sub-conveying unit 6, it is possible to reduce the control torque of the stepping motor when controlling the stacking impeller, and as a result, it is possible to perform the stacking operation of the paper sheets at high speed. Becomes Further, by using the above-described method of controlling the stacking impeller according to the present invention together with the sheet pitch correction by the sub-conveying unit, it becomes possible to perform the sheet stacking operation at a higher speed.

Next, the transport system will be described.

FIG. 5 shows a partial schematic structure of one unit (transport unit) of the transport section 20, FIG. 5 (a) is a plan view, FIG. 5 (b) is a front view, and FIG. 5 (c) is a perspective view. It is a figure.
The transport unit includes a belt 21, a roller 22 and a guide 23. Two belts 21 are provided in parallel with the transport direction. The conveyance method is a conveyance width direction of the paper sheet 10 (direction orthogonal to the conveyance direction) by the roller 22 and the belt 21.
It holds two parts and transports them. The belt 21 is hung on a drive roller (not shown) provided at a position apart from the conveying surface and is driven at high speed. The roller 22 around which the belt 21 is hung rotates by idling, and the paper sheet 10 is carried out between the belt 21 and the roller 22. In order to ensure the conveyance of the paper sheet 10, the interval between the rollers 22 is set to be equal to or less than the paper sheet length in the conveyance direction, and at least a part of the paper sheet 10 is always held between the belt 21 and the roller 22. Therefore, the driving is performed stably. The guide 23 is arranged in a rail shape at a height having a clearance of about 0.5 to 3 mm with the belt 21 in the width direction of conveyance of the conveyed paper sheets. By using a resin material or a polymer material (for example, polytetrafluoroethylene resin) having lubricity as the surface material of the guide 23, damage to the paper sheet 10 due to contact can be reduced. Also,
It is also effective to coat the surface of the metal-worked guide with a lubricating material or to bond members made of the lubricating material.

Both end portions of the guide 23 are arcuate notches formed along the outer shape of the roller shaft from the side to the upper side of the roller shaft, and at the tip end downstream in the conveying direction, the guide upper surface is located above the roller. The inclined surface is formed so as to face, thereby preventing the paper sheets from wrapping around the lower side of the guide 23. Also, the guide is provided parallel to the belt,
Since the shape is such that the paper sheet is supported with a small width, even if the paper sheet 10 is bent or vibrated in the vertical direction during the conveyance, it does not hinder the conveyance. This is especially for paper sheets 10 during high speed conveyance.
Effectively prevent the damage of.

The advantage of this transport system is that the belt 21
Since no deviation force is generated in the belt, it is extremely unlikely that the belt will come off, and for that reason, adjustment of the belt tension is not necessary. Due to the simple structure, the number of rollers 22 and the number of belts 21 are small, so that the device can be used as a device. It is small in size and light in weight, generates a small amount of noise even when being conveyed at a high speed, and does not easily damage the paper sheet 10.

FIG. 12 is a block diagram showing the details of the transport path 20 shown in FIG. 1, in which the transport unit shown in FIG.
A plurality of these rollers are connected so that they are on the same arc. When the belt is conveyed at a high speed by such a conveying system, the belt runs between the rollers in an arc of radius R due to its own inertia. When the paper sheet is conveyed in this state, a centrifugal force F in the belt direction is applied to the paper sheet. Here, F can be expressed as F = mv ² / R (9) where m ... Mass of one sheet v ... Transport speed (belt speed) of paper 1 / R ... Curvature of transport path. Further, the conveyance force Fp of the paper sheet is: Fp = μF + Fr (10) where μ is the friction coefficient between the belt and the paper sheet Fr is the conveyance force of the roller-belt sandwiching portion.

From the equations (9) to (10), it can be seen that in this conveying system, the higher the sheet conveying speed is, the higher the pressure contact force of the sheet with the belt is. Therefore, one side of the paper sheet between the rollers is always pressed against the conveyor belt, and it is possible to avoid collision with the guide due to fluttering of the tip of the paper sheet and tear due to windage, which is extremely advantageous especially at high speed conveyance. Is. Another advantage of this transport method is that the belt is less likely to come off because the belt is not displaced, and the belt tension does not need to be adjusted for that reason. The number of the devices is small and the device is small and lightweight, and the noise generated even at high speed is small.

FIG. 13 shows an example of the structure of the transfer portion between the belts in the conveying system according to this embodiment. In this example, the base portion of the upstream belt is opposed to the leading end portion of the downstream transport belt, and as a result, the guide 2 is provided on the downstream side.
Reference numeral 3 denotes an upper side of the belt 21, and upstream of the guide 23, a guide 23 is disposed below the belt 21.

FIG. 14 shows another example of the transport unit. FIG. 14 (a) is a plan view, FIG. 14 (b) is a front view, and FIG. 14 (c) is a perspective view. In this conveying system, at least one position in the length direction of the paper sheet is sandwiched by a belt and a roller, and both widthwise end portions are guided from the outside of the roller. That is, only one belt is used and this belt is suspended between the two rollers 26, 26. Two guides 23 are provided outside the belt in the width direction. The shape of this guide is exactly the same as that described in FIG. Even with this transfer method, high-speed transfer is possible.

FIG. 15 shows a combination of the transfer unit shown in FIG. 14 and the transfer unit shown in FIG. 5 in the transfer section shown in FIG. In this conveyance device, the belt 21 on the downstream side is provided between the two rollers 27 at the front end as shown in FIG.
The roller 26 on the downstream side and upstream side of the transport unit shown in FIG. 4 is positioned. By doing so, the distance between the rollers 27 and 26 can be reduced, and a conveyance system with less jam can be realized.

FIG. 16 shows an example in which the paper sheet detectors 71, 72, 73 are arranged on the conveying path of the present invention. Since the rollers are concentratedly provided on one side of the conveying path, the size of the detection system can be designed quite freely on the side where no rollers are present, so that there are few restrictions on the size when designing the detection device. In addition, the distance from the paper sheets can be freely set. On the side where the roller exists, basically, a shake detection device and a conventional one can be arranged, and by integrating the detection device and the guide,
It is also possible to perform detection by approaching the paper surface.

FIG. 17 shows the construction of a carrying device 80 according to another embodiment of the present invention. FIG. 17 (a) is a plan view,
17B is a front view and FIG. 17C is a side view.
In this embodiment, a belt is used instead of the guide shown in FIG. That is, the roller in this embodiment is composed of a normal roller 81 and a roller portion 82 having a diameter smaller than that of the normal roller 81, and a belt 83 is provided between the rollers 81 and 81.
However, a belt 84 is hung between the rollers 82, 82. A clearance of about 0.5 to 3 mm is provided between the belts 83 and 84, so that the belt 84 plays the same role as the guide plate described in FIG.

As described above, according to the present invention, it is possible to freely select the manner of sandwiching the paper sheet, the location, and the position of the guide.

[0057]

As described above, according to the paper sheet inspection apparatus of the present invention, the insertion into the impeller is controlled on the basis of the pitch between the paper sheets. It is possible to provide a paper sheet inspection apparatus capable of performing extremely high-speed stacking operation without increasing the control torque of the motor that drives the vehicle.

Further, according to the paper sheet conveying apparatus of the present invention, the paper sheet is guided by the guide plate while the conveying force is given by the rollers and the belt, so that the paper sheet can be stably provided with a simple structure. High-speed transportation of items.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an overall configuration of a paper sheet inspection apparatus according to the present invention.

FIG. 2 is a block diagram showing the configuration of a control system of the paper sheet inspection apparatus according to the present invention.

FIG. 3 is a schematic configuration diagram of a paper sheet takeout unit of the paper sheet inspection apparatus according to the present invention.

FIG. 4 is an explanatory view of a paper sheet takeout procedure in the paper sheet inspection apparatus according to the present invention.

FIG. 5 is a schematic configuration diagram of a paper sheet transport unit of the paper sheet inspection apparatus according to the present invention.

FIG. 6 is a timing chart showing how a sheet pitch is detected.

FIG. 7 is a schematic configuration diagram of a paper sheet stacking unit of the paper sheet inspection apparatus according to the present invention.

FIG. 8 is an explanatory diagram of an insertion width in the integrated impeller of the paper sheet inspection apparatus according to the present invention.

FIG. 9 is a flowchart showing how the stacking unit of the paper sheet inspection apparatus according to the present invention is controlled.

FIG. 10 is a graph showing the effect of the control system of the paper sheet inspection apparatus according to the present invention.

FIG. 11 is a schematic configuration diagram of a sub-transport unit in the paper sheet inspection apparatus according to the present invention.

FIG. 12 is a configuration diagram showing details of a conveyance path 20 shown in FIG.

FIG. 13 is a configuration diagram of a delivery unit between belts in the paper sheet conveying apparatus according to the present invention.

FIG. 14 is a configuration diagram showing another example of the transport unit.

FIG. 15 is a configuration diagram showing a modified example of the delivery section shown in FIG.

FIG. 16 is a configuration diagram showing an example in which a plurality of detection units are arranged on a conveyance path.

FIG. 17 is a configuration diagram showing a configuration of a carrying device according to another embodiment of the present invention.

FIG. 18 is a configuration diagram of a paper sheet conveying device used in a conventional paper sheet inspection apparatus.

FIG. 19 shows a conventional transport mechanism adopted when transporting paper sheets at a lower speed.

FIG. 20 is a schematic configuration diagram of a paper sheet stacking unit in a conventional paper sheet inspection apparatus.

[Explanation of symbols]

 10 Paper Sheets 11 Take-out Rotor 12 Chamber 13 Vacuum Pump 14 Paper Feeding Stand 15 2 Sheets Preventing Block 16 Suction Hole 17 Notch of Chamber 20 Conveying Paths 21, 25, 83, 84 Belt 22, 26, 81, 82 Roller 23 Guide 31 Sorting gate 41 Integrated impeller 42 Stepping motor 43 Rotary encoder 44 Bare board 45 Insertion detection sensor 47 Photoelectric sensor 51, 52, 53, 53 sensor 61 Sub-transport path transport belt 62 AC servo motor 71 Drive roller 72 Roller 73 Guide

Claims (6)

[Claims] 1. A transport unit for sequentially transporting a plurality of paper sheets, and a plurality of grooves into which the paper sheets can be inserted are provided, and each of the paper sheets transported through the transport unit is rotated. 1 in the groove
In a paper sheet inspection apparatus including a rotating body that receives the sheets one by one, and a stacking unit that stacks the paper sheets that are inserted in the grooves of the rotating body, between the paper sheets that are transported on the transport unit. Detecting means for detecting the pitch, and control means for controlling the paper sheets to be inserted from a predetermined position of the groove of the rotating body based on the pitch between the paper sheets detected by the detecting means. A paper sheet inspection device characterized by being provided. 2. The rotation speed control means for controlling the rotation speed of the rotating body based on the pitch between the sheets detected by the detection means. The described paper sheet inspection apparatus. 3. The transport unit includes a sub-transport unit provided in the middle of the transport unit and driven independently of the transport unit, and the control unit is based on the pitch between the paper sheets detected by the detection unit. The paper sheet inspection apparatus according to claim 1, wherein the paper sheet inspection apparatus is a unit that changes a conveyance speed of the paper sheet in the sub-conveyance unit. 4. The storage means for storing the pitch between the paper sheets, a calculation means for performing a predetermined calculation, and a rotation means for the paper sheets based on the calculation result of the calculation means. 4. The paper sheet inspection apparatus according to claim 2, further comprising a mechanism control unit that controls insertion of the sheet. 5. A pair of rollers arranged at a predetermined distance, a belt suspended by the pair of rollers and wound around the rollers at a predetermined angle, and a belt disposed between the pair of rollers. A transport unit comprising a guide member arranged at a constant distance from the surface facing the roller, and holding the paper sheet between the roller and the belt, and driving the belt to drive the paper sheet. A paper sheet transporting device, which is configured to transport leaves. 6. The paper sheet conveying apparatus according to claim 5, wherein a plurality of the conveying units are arranged so that the belt forms a substantially cylindrical surface having a center of curvature in the same direction.