JPH10231035A - Paper sheet feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deliver paper sheets with specified spaces and convey them at high speed by temporarily reducing the speed of a bite roller in case of a space between the paper sheets being small, and resetting the speed of the bite roller to the same speed as the speed in a lower reaches conveying path before the rear end of the paper sheet is detached from the bite roller. SOLUTION: A driving pulley 47a and a driving pulley 48a are temporarily reduced in speed from the time of the tip of a succeeding paper sheet 2b being engaged with an engaging point (λ) until the time of the rear end of the succeeding paper sheet 2b passing through completely. Since a preceding paper sheet 2 is conveyed on at constant speed, at 3.4m/s, for instance, a space to the succeeding paper sheet 2b is lengthened so as to be able to obtain a minimum space L or more. In this case, it is necessary to set the conveyed length of the paper sheet 2 to the minimum length of the paper sheet 2 or less before the driving pulley 47a and driving pulley 48a are reset to the specified conveying speed, 3.4m/s, for instance, after being temporarily reduced in speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet processing apparatus provided with separating means for separating supplied paper sheets into single leaves.

[0002]

2. Description of the Related Art A paper sheet supply apparatus for separating paper sheets one by one or one by one from a supply means, which is provided with an interval control means for controlling the interval between the paper sheets, is particularly useful. There is a paper sheet supply apparatus disclosed in Japanese Patent Application Laid-Open No. 64-28133. In the above-mentioned conventional example, the pickup roller has a speed-controllable pickup roller and a first detector for detecting the leading end of the sheet sandwiched by the pickup roller, and the end of one sheet is the second sheet. Continuous from the time after passing through one detector until the next sheet leading edge arrives
It is configured to measure two intervals, calculate the acceleration or deceleration time necessary for correcting the interval by comparing the measured interval with a preset value, and control the rotation speed of the pickup roller. .

[0003]

However, the above-mentioned prior art has the following problems.

For example, if the length of a paper sheet is shorter than the acceleration or deceleration time required for correction, the rear end of the paper sheet passes the pickup roller before the correction is completed. Not done. Alternatively, if the leading edge of the paper sheet reaches the downstream transport path during acceleration for correction, the speed of the pickup roller is higher, so that the paper sheet is held at the distal end by the lower downstream transport path,
Buckles and jams occur.

The above-mentioned prior art does not describe the length of paper sheets or the relationship between the pickup roller and the downstream conveyance path when calculating the acceleration or deceleration time required for such an interval correction. .

Further, in the above-described conventional example, the leading end of the paper sheet is held by a pickup roller, and the leading end is provided at this position. When the leading end is detected by a detector, the driving roller stops instantaneously. Then, the feeding operation by the suction belt is also stopped, but since the conveyance force of the pickup roller is stronger than the suction force by the suction belt, the sheet sandwiched by the pickup roller is sent to the downstream conveyance path. However, the conveyance force of the pickup roller decreases due to the friction coefficient decreasing from the initial state due to aging or adhesion of dust and paper powder to the surface, and when the suction force is smaller than the suction force by the suction belt, the paper slips and is conveyed. The problem of being unable to do so occurs.

Further, for example, when a perforation is provided so that the leading end of the conveyed paper sheet is easily cut, the leading end is detected by the detector when only the leading end of the perforated sheet is clamped by the pickup roller. Since the detection is detected and the driving roller stops instantaneously, there is a problem that only the tip of the perforation is pulled by the pickup roller and cut.

An object of the present invention is to solve the above-mentioned problems and to provide a sheet feeding apparatus which can send sheets at predetermined intervals and convey the sheets at high speed.

[0009]

The paper sheet processing apparatus of the present invention has the following configuration.

[0010] That is, a sheet feeding means, a suction belt for sucking and conveying the sheets one by one, and the second and subsequent sheets of the sheets are taken out and conveyed. Friction member, a downstream transport path for transporting the sheets separated one by one, and a pair of speed-controllable bites between the suction belt and the downstream transport path. A roller, at least one interval detection for detecting an interval between the paper sheets, a bite detection means for detecting that the leading end of the paper sheet has been bitten by the bite roller, and a speed control of the bite roller. And interval control means for controlling the interval between the paper sheets, and stops the suction belt when the jam detection means detects the leading end of the paper sheet, and detects the interval or the jam detection. Detect paper sheet spacing by either Then, the driving of the suction belt is started, and the interval between the paper sheets is measured by the engagement detecting means. If the measured interval between the paper sheets is smaller than a preset value, the engagement roller is used. Is controlled so as to temporarily reduce the speed of the sheet, and before the trailing end of the sheet leaves the jammed roller, the speed of the jammed roller is controlled to return to the same speed as the downstream conveyance path. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is a schematic view of a sorting machine for sorting postal letters such as postcards and sealed letters, which is an embodiment of the paper sheet processing apparatus of the present invention.

The letter sorter shown in FIG. 1 reads not only the postal code but also the address written on the paper sheet, and processes this paper sheet by printing this information as a bar code on the paper sheet. Things. Therefore, a separating unit 4 for separating sheets one by one, a detecting unit 20 for detecting double feed of sheets, an interval correcting unit 21 for correcting an interval between preceding sheets, and a sheet In addition to the positioning means 3 for correcting the skew and shift of the printer, a reading unit 9a for reading a postal code and an address, a printer 22 for printing a barcode, and a barcode reading unit 9 for reading a barcode
b, 9c. As the printer 22 for printing a barcode, an ink jet printer is used for printing on paper sheets of various thicknesses and materials.

Next, the flow of sheets in the letter sorter shown in FIG. 1 will be described.

The paper sheets 2 set on the hopper, which is the supply means 1 of the letter sorter, are separated one by one by separation means 4. Such a sheet separating means generally employs a suction method using a vacuum suction belt. The vacuum chamber is subjected to a negative pressure to suction the sheets 2 to the suction belt, and the suction belt is, for example, an electric motor. By rotating using the driving means, it is possible to separate and convey only one of the paper sheets 2 closest to the suction belt.

The paper sheets 2 separated one by one are double-fed by the detecting means 20 and flexural rigidity (hardness) of the paper sheets in order to prevent erroneous classification of the paper sheets and obstacles during transportation in advance. Is detected.
Sheets that are regarded as double feed by the detection means 20 or whose bending stiffness (hardness) is excessive are switched into the reject box 24 by switching the transport gate 23 on the downstream side of the detection means 20. .

Sheets that are not regarded as abnormal by the detecting means 20 are conveyed to the positioning means 3 and skew and shift are corrected. The positioning means 3 corrects the posture of the paper sheet or reads the barcode printing position in order to normally read by the address reading section 9a and the barcode reading section 9b on the downstream side. It is provided to match the sensor position.

The paper sheet 2 that has passed through the positioning means 3 is read by a destination reading section 9a first of all, where the postal code and the destination are read, and then a bar code reading section 9b provided downstream thereof is used to read the sender and other stations. Reads the barcode given to the paper sheet.

For the paper sheet 2 to which no bar code is given, a bar code is printed at the position of the paper sheet 2 determined by the ink jet printer 22 based on the information read by the address reading section 9a.

The paper sheet 2 on which the barcode is printed is
The barcode is read by the barcode reading unit 9c downstream of the printer 22. According to the barcode information, switching of the gate 25 and a gate (not shown) provided above the sorting shelf 11 is performed so that the sheets are stacked on the sorting shelf 11 determined in advance. The paper sheet 2 whose address could not be read is provided with an ID code and is conveyed to the reject section shelf 11A.

In the sorting machine shown in FIG.
On the downstream side of c, there is provided a paper sheet overlapping conveyance path 5 composed of two long and short conveyance routes. This means that if two sheets are stacked on the same section shelf in succession, the succeeding sheet is stacked on the preceding sheet, and the two sheets are stacked on the section shelf in a state where the two sheets are stacked. To improve the integration reliability. Normally, paper sheets are conveyed along the longer conveyance path 7b of the stacked conveyance paths of the paper sheets. When the paper sheets are stacked, the succeeding paper sheets are conveyed to the shorter conveyance path 7a.
Is transported and stacked on the preceding sheet. By stacking the sheets in this way, when the sheets are continuously stacked on the same section shelf, a jam due to the succeeding sheet colliding with the preceding sheet is prevented.

A transport path 16 for transporting paper sheets to the sorting shelf is provided above each section of the sorting shelf 11.

FIG. 2 is a simplified block diagram showing the configuration of the sorting machine of the present invention shown in FIG. In FIG. 2, the supply means is capable of holding a plurality of paper sheets 2, and can move the paper sheets 2 in the direction of arrow A. The supply control means 68 controls the operation of the supply means 1.

The separation control means 67 controls the operation of the separation means 4.

The conveying means 7 conveys the paper sheets 2 separated into single leaves by the separating means 4. Conveying means 7
Is transported by sandwiching the front and back of the paper sheet 2 separated by the separation means 4 between two belts, for example.

The interval correcting means 21 is composed of, for example, a pair of biting rollers capable of changing the rotation speed, or a biting belt wound around the rollers (a biting belt is illustrated in this drawing). The interval detecting means 21a includes, for example, a pair of light emitting elements and light receiving elements facing each other with the transport means 7 interposed therebetween, and is arranged so as to be shielded from light while the paper sheet 2 passes.

The interval measurement control means 70 can measure the interval between the paper sheet 2 and the preceding paper sheet 2 by measuring, for example, the time during which the signal from the interval detection means 21a is not blocked. The interval control means 71 is the interval correction means 2
1 is controlled.

The reading means 9 comprises an address reading section 9a or a bar code reading section 9b for reading an address, such as an address or a bar code, which is given to the sheet 2 in advance.

The stacking means 11 is capable of sorting and stacking the sheets 2 after the reading has been performed, and includes a plurality of stacking means.

The sorting information input means 72 is means for inputting sorting information for sorting the paper sheets 2.

The sorting selecting means 13 associates the sorting information input from the sorting information inputting means 72 with the destination code read by the reading means 9 and sorts the paper sheets 2 to one of the corresponding stacking means 11. It is a means to put in.

The control unit 66 controls the reading unit 9, the distribution unit 61, the separation control unit 67, the supply control unit 68, the interval measurement control unit 70, the interval control unit 71, and the section information input unit 72.

Next, an example of the structure of the separating means 4 capable of separating the paper sheets 2 at such a minimum interval will be described with reference to FIG.

In FIG. 3, the separation belt 40 is made of rubber, for example, and has a structure in which suction holes are provided on one surface.
The suction box 41 is a hollow box, which is in contact with the separation belt 40 on the side opposite to the paper sheet 2. The paper sheet 2 is adsorbed to the separation belt 40 through the passage. The separation pulley 42 can rotate or stop the suction belt 40 in the direction of arrow B by an electric motor (not shown) or the like. The supply belt 43 can be moved in a direction (C direction) in which the supplied paper sheets 2 are placed and approach the separation belt 40. The supply belt driving pulley 44 drives the supply belt 43. The holding member 45 is made of, for example, rubber and has springs 46a, 46a.
The force is urged in the direction of the separation belt 40 by b.

Next, the mechanical configuration of the interval correction means 21 will be described. The driving pulley 47a is a pulley that is rotated in the direction A by an electric motor (not shown), and the driven pulley 47b is a rotatably supported pulley. A belt 47c is wound around the driving pulley 47a and the driven pulley 47b. ing. The driven pulley 48b is connected to the bracket 4
A pulley rotatably provided on 9a, which is rotatably supported around a rotation center 49b together with a bracket 49a. The drive pulley 48a is a pulley that is rotated in the D direction by an electric motor (not shown), and a belt 48c is wound around the drive pulley 48a and the driven pulley 48b. The spring 49 allows the bracket 49 a
, The belt 48c wound around the driven pulley 48b and the belt 47c wound around the drive pulley 47a.
On the other hand, it can be biased at point a. When a thick sheet of paper meshes between the belt 47c and the belt 48c, the driven pulley 48b
Since it can rotate around b and move in the direction of arrow E, it does not hinder the passage of thick paper sheets. Note that the drive pulleys 47a and 48a do not need to be driven by separate electric motors, and the respective drive pulleys may be linked to rotate in a predetermined rotation direction by a single electric motor. The above is the configuration of the interval correction unit 21.

The downstream conveying means 51 is constituted by opposing conveying belts 51a and 51b, and forms a part of the conveying means 7, and can convey letters at a predetermined speed. The conveying belts 51a and 51b can contact each other at the point B to apply a conveying force to the paper sheet.

The pair of the light emitting element 52a and the light receiving element 52b is
This is a detection sensor that can detect the passage of the leading edge and the trailing edge of the paper sheet 2. The interval detecting means 21a is a similar detection sensor, and includes the belt 47c and the belt 48c.
Is located slightly downstream from the meshing point of the paper sheet 2, and detects the leading end of the paper sheet 2 after meshing with the belt 47c and the belt 48c.

Next, the operation of the separating means 4 in this embodiment will be described with reference to FIGS.

In FIG. 3, the paper sheet 2a closest to the separation belt 40 is pulled by the negative pressure from the suction box 41 through the suction holes provided in the separation belt 40.
It is adsorbed to zero. The separation belt 40 is rotating in the direction B so that the surface speed is, for example, 3.4 m / s. The adsorbed paper sheets 2a are transported together with the separation belt 40 in the direction F. At this time, the paper sheet 2a is placed on the supply belt 43, and comes to rest at the same state as the suction belt 40 at 3.4 m / s.
Although the acceleration is inversely proportional to the mass, when the mass of the paper sheet 2a is lightweight, for example, about 1 g to 2 g, it accelerates almost immediately, but when the mass of about 50 g is present, for example. It takes time until the speed of the separation belt 40 is reached, and the paper is conveyed while slipping with the separation belt 40. On the other hand, the trailing paper sheet 2b is stopped by the front end being pressed by the pressing member 45.

FIG. 4 shows a state in which the leading end of the leading sheet 2a passes through the mesh point A, and the detection sensor serving as the interval detecting means 21a is shielded from light. When the detection sensor of the interval detecting means 21a is shielded from light, the separation belt 40 is momentarily stopped. The sheet 2a is conveyed at a constant speed, for example, 3.4 m / s, because the sheet 2a is held between the belt 47c and the belt 48c at the point A. Here, assuming that the conveyance force received by the sheet 2a from the belts 47c and 48c at the point A is greater than the suction force received by the sheet 2a from the separation belt 40, even if the separation belt 40 stops. The sheet 2a is transported at the transport speed of the belt 47c and the belt 48c. Conversely, if the separation belt 40 temporarily removes the sheet 2a
If the suction force received by the belt 47c and the belt 48c is larger than the conveyance force received by the paper sheet 2a from the belt 47c and the belt 48c at the point A, the belt 47c and the belt 48c slip at the point A and the paper sheet 2 is removed. It is necessary to prevent such a condition from being satisfied because the transfer cannot be performed.

Further, as an example, when the paper sheet 2 is a postal matter, a perforation may be provided at a leading end portion of about 5 mm to 10 mm to make it easy to separate. If the separation belt 40 is immediately stopped when the leading end of the paper sheet 2 reaches the engagement point A, only the leading end of the perforation is pulled at a predetermined speed, and the suction force of the separation belt 40 is reduced. Add to eyes.
For this reason, there is a possibility that the paper sheet 2 may be cut into two pieces from the perforated portion. In order to prevent such a phenomenon, the sheet 2 is conveyed about 10 mm to 15 mm after the leading end of the sheet 2 reaches the engagement point A, and separated after the perforated portion passes the engagement point A. The belt 40 may be stopped.

Next, as shown in FIG. 5, when the trailing end of the preceding sheet 2a passes through the leading end of the succeeding sheet 2b,
A detection sensor 52a downstream of the succeeding sheet 2b;
Alternatively, the detection sensor 52b enters a transmission state.

FIG. 5 shows that the leading end of the following sheet 2 is located between the detection sensor 52a and the detection sensor 52b.
2B shows the case where the trailing end of the preceding paper sheet 2 passes through the detection sensor 52a when the leading end of the succeeding paper sheet 2 is above the detection sensor 52a. The detection sensor 52a changes from the light blocking state to the transmission state. Alternatively, when the leading end of the succeeding sheet 2b is between the detection sensor 52b and the interval detecting unit 21a, the interval detection is performed when the rear end of the preceding sheet 2a passes the interval detecting unit 21a. The means 21a changes from the light-shielding state to the transmission state. As described above, when any one of the detection sensors changes from the light blocking state to the transmission state, the separation belt 40 is instantaneously rotated at a predetermined speed again to start the conveyance of the succeeding sheet 2b. Here, the preceding paper sheet 2a is conveyed at a constant speed, for example, 3.4 m / s due to the engagement at the point A, but when the mass of the following paper sheet 2b is large, FIG. As described above, a gap is generated between the paper sheet 2a and the preceding paper sheet 2a because the paper is slipped with the separation belt 40. On the other hand, when the letter is light, the interval with the preceding sheet 2a is almost equal to the minimum interval at which one of the detection sensors is in the transmitting state, and is conveyed at a short interval of at most about 10 mm.

Next, as shown in FIG. 6, the leading end of the following paper sheet 2b passes through the mesh point A, and the distance detecting means 21a
Is shielded from light. FIG. 6 is the same as FIG. 4 except for the preceding paper sheet 2a. At this point, the succeeding paper sheet 2b is also engaged at the engagement point A, so that the transport speed becomes a constant speed, for example, 3.4 m / s. Therefore,
At this time, the interval L between the preceding paper sheet 2 and the following paper sheet 2 is constant during the subsequent conveyance. If the interval L is smaller than the minimum interval L (minimum) that can be conveyed, an obstacle such as collision of letters on the downstream conveyance path or the stacking means occurs. It is necessary to make the interval longer than the minimum interval L (minimum). Therefore, the drive pulley 47a and the drive pulley 48a are provided between the time when the leading end of the succeeding paper sheet 2b meshes with the meshing point a as shown in FIG. 6 and the time when the rear end of the succeeding paper sheet 2b finishes passing. Is temporarily decelerated, the preceding paper sheet 2 continues to be conveyed at a constant speed, for example, 3.4 m / s. Therefore, the distance between the following paper sheet 2b and the minimum distance L is increased.
(Minimum) or more.

Here, the length of the sheet 2 being conveyed until the driving pulley 47a and the driving pulley 48a are temporarily decelerated and returned to a predetermined conveying speed, for example, 3.4 m / s again, is set to the sheet length. It must be set to be less than the minimum length of class 2. Otherwise, while the drive pulley 47a and the drive pulley 48a are temporarily decelerating, the rear end of the sheet 2 passes the mesh point A, and the interval between the sheets 2 becomes the minimum interval L (minimum). Will be below.

Next, the temporary deceleration described above will be described with reference to FIG.

FIG. 7 shows that the interval L between the sheets 2 is the minimum interval L
FIG. 10 is a diagram illustrating a change in speed of the drive pulleys 47a and 48a when the distance is smaller than (minimum) and the interval needs to be extended;
The abscissa indicates the elapsed time. Here, it is necessary to increase the interval between the sheets by L (minimum) -L. In FIG. 7, the speed L2 is equal to the transport speed of the downstream transport path 51, for example, 3.4 m / s. V1 represents the temporarily decelerated speed, which is smaller than 3.4 m / s. After the leading end of the paper sheet 2 has been bitten at the biting point a, the time t
After the lapse of 0, the speed is reduced to the speed V1 within the time t1. After the conveyance at the speed V1 for the time t2, the speed is restored to the speed V2 again within the time t1.

Here, the time t0 is set so that the perforated portion at the leading end of the paper sheet 2 passes through the biting point A.
The time t1 of the speed change is determined by the limit of the acceleration / deceleration rate of the motor or the like as the driving source. Here, the following paper sheets 2
After the leading end of the b is bitten at the biting point A, a series of acceleration / deceleration is completed and the sheet 2 is returned to the speed V2.
The transported distance L2 of b is expressed as follows.

The distance by which the succeeding paper sheet 2b is conveyed is obtained by the following equation.

L2 = (t0 · V2) + (t2 · V1) + t1 · (V2−V1) That is, the first term is that the perforation at the leading end of the succeeding paper sheet 2b is the biting point a. Conveyance distance to pass, No.
The second term is the transport distance during low-speed transport at the speed V1, and the third term is the transport distance during acceleration / deceleration.

The change in the distance L between the sheets at this time will be described. The preceding sheet 2a has a constant speed V2.
, The transport distance is expressed as follows.

The distance L1 = conveyed distance of the preceding sheet 2a =
(t0 + 2.t1 + t2) .V2 Therefore, the distance between the preceding paper sheet 2a and the following paper sheet 2b becomes longer by L1-L2. As described above, the velocity V is set so that L1−L2 is equal to (minimum distance L between sheets (minimum) −measured distance L between sheets 2).
1. The time t2 may be determined. Here, t0 and t1 may be constant values. For example, if the speed V2 is 3.4 m / s and the perforation position at the leading end of the paper sheet is 20 mm or less from the leading end of the paper sheet, t0 may be set to 6 ms.

Here, it is necessary to set the distance L2 at which the succeeding sheet 2b is conveyed to be shorter than the length of the shortest sheet 2 to be supplied. Otherwise, as described above, the rear end of the paper sheet 2 passes through the biting point A during the acceleration / deceleration shown in FIG. Assuming that the paper sheet is a postal matter and the length of the shortest postal matter is 140 mm, L2 may be less than 140 mm.

On the other hand, when the mass of the succeeding paper sheet 2b is large, the paper sheet 2b slides with respect to the separation belt 40 during acceleration. The distance L between the paper sheets shown in FIG. 6 may be larger than the minimum distance. In such a case, it is effective to temporarily increase the conveyance speed of the succeeding paper sheet 2b than the preceding paper sheet 2a to shorten the interval with the preceding paper sheet 2a. However, in such a case, the leading end of the succeeding paper sheet 2b is connected to the downstream conveying means 51a and 51b.
If the sheet 2 is bitten by the engagement point b, the speed at which the sheet 2 is pushed from behind becomes higher, so that the sheet 2 may buckle and jam, especially when the sheet 2 has low rigidity. . Therefore, when accelerating the succeeding sheet 2b in this way, it is necessary to decelerate again before the leading end of the sheet reaches the engagement point B and to return to the predetermined conveying speed.

FIG. 8 shows, contrary to FIG. 7, that the succeeding sheet 2b is temporarily accelerated to a speed V3 greater than the speed V2 and the time t3 is increased.
FIG. 7 is a diagram showing a speed change until the sheet is conveyed only to return to the speed V2 again. As in the description of FIG. 7, the transport distance L2 of the succeeding paper sheet 2b in this case is expressed as follows.

L2 = (t0 · V2) + (t3 · V3) + t1 · (V3−V2) Here, it is necessary to decelerate again before the leading end of the paper sheet reaches the engagement point B and return to the predetermined conveying speed. Therefore, if the distance between the engagement point A and the engagement point B is L3, , L2 <L3.

The distance L over which the preceding sheet 2a is conveyed is
Since 1 is L1 = (t0 + 2.t1 + t3) .V2, the interval between the succeeding sheet 2b and the preceding sheet 2a is shortened by L2-L1.

If the interval between the sheets measured by the interval measuring means 21a is only slightly larger than the minimum interval, the preceding sheet 2b is accelerated by accelerating the succeeding sheet 2b. It is necessary to adjust the speed V3 or the time t3 so that the interval with the class 2a is not smaller than the minimum interval. On the other hand, if the distance between the succeeding paper sheet 2b and the preceding paper sheet 2a is sufficiently large compared to the minimum distance, the distance is as small as possible within a range where the above-described relationship of L2 <L3 is maintained. It is needless to say that it is desirable to reduce

Here, in order to prevent breakage of the perforated letter, the drive pulley
7a and 48a, the interval detecting means 21a is provided downstream of the mesh point A, and the interval detecting means 21a is provided after the perforation position at the leading end of the paper sheet passes the mesh point A. 21 a may detect the leading end of the paper sheet 2.

Next, the conveying force of the paper sheet 2 at the engagement point A will be described.

As described above, the conveying force of the sheet 2 at the engagement point A is larger than the suction force of the separation belt 40.
If the condition is not satisfied, the paper sheet 2 slips at the engagement point A, so that the paper sheet 2 cannot be transported. Here, in the case of a single-sided drive configuration in which the meshing point a portion is constituted only by a pair of pulleys of the drive pulley 47a and the driven pulley 48b, the drive pulley 47 of the driven pulley 48b
Assuming that the pressing force with respect to a is F and the friction coefficient between the driving pulley 47a and the sheet 2 is μ, the conveying force S applied to the sheet 2 is expressed as S = F · μ. On the other hand, FIGS.
As described in the above, if the driving force from the driving pulleys 47a and 48a is transmitted to the belts 47c and 48c to apply a conveying force from both the front and back sides of the sheet 2, the sheet 2 is added to the sheet 2. The conveying force S can be expressed as S = 2 · F · μ, and a double conveying force can be obtained. That is,
By using a double-sided drive configuration as compared with the case where the meshing point A is a single-sided drive configuration, slip at the meshing point A can be prevented. Furthermore, even if the friction coefficient of the surface of the pulley or the belt is reduced to half, the same conveying force can be obtained, so that the service life can be extended. Further, when the conveying force is equal and sufficient, the pressing force F of the pulley can be halved, so that the damage of the letter can be reduced.

Further, compared to a configuration in which the paper sheets 2 are directly conveyed by a driving pulley or a driven pulley, a configuration in which the paper sheets 2 are conveyed by a belt wound around a pulley can further increase the service life. Can be. For example, the outer peripheral length of a 40 mm diameter pulley is about 125 mm, but when a 40 mm diameter pulley is arranged 60 mm apart and the belt is wound around the outer circumference, the belt length is about 245 mm, and the outer peripheral length is about Double. Therefore, assuming that the materials are the same, the life with respect to wear and a decrease in the coefficient of friction is approximately doubled.

[0063]

According to the present invention, the fluctuation of the interval between the conveyed sheets can be reduced, and the conveying force can be increased to extend the service life. A kind of processing device can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a mail sorting machine as an embodiment of a paper sheet processing apparatus.

FIG. 2 is a simplified block diagram showing a configuration of the sorting machine of the present invention shown in FIG. 1;

FIG. 3 is a side view illustrating an example of a configuration of a supply unit configuring the present invention.

FIG. 4 is a side view showing another example of the configuration of the supply unit that constitutes the present invention.

FIG. 5 is a side view showing still another example of the configuration of the supply unit constituting the present invention.

FIG. 6 is a side view showing another example of the configuration of the supply unit that constitutes the present invention.

FIG. 7 is a diagram illustrating an example of an interval correction operation according to the present invention.

FIG. 8 is a diagram showing another example of the interval correction operation according to the present invention.

[Explanation of symbols]

1 ... supply means, 2 ... paper sheets, 3 ... alignment means, 4 ... separation means,
5 ... superimposing means, 7 ... transport means, 9 ... reading unit, 11
... Accumulation means, 13 ... Distribution selection means, 20 ... Detection means, 21
... interval correction means, 21a ... interval detection means, 22 ... printer, 2
3 ... Transport gate, 24 ... Reject box, 25 ... Gate, 40 ... Separation belt, 41 ... Suction box, 42 ... Separation pulley, 43 ... Supply belt, 44 ... Supply belt drive pulley, 45 ...
Holding member, 46a, 46b ... spring, 47a, 48a ... drive pulley, 47
b, 48b: driven pulley, 47c, 48c: belt, 49a: bracket, 49b: center of rotation, 50: spring, 51: downstream conveying means, 5
2a, 52b: detection sensor, 61: distribution control unit, 66: control means, 67: separation means control means, 68: supply means control means,
70: interval measuring means control means, 71: interval control means, 72: sorting information input means.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Tamamoto 502, Kandachicho, Tsuchiura-shi, Ibaraki Pref.

Claims (5)

[Claims] A sheet feeding means, a separation belt for sucking and conveying the sheets one by one, and a second and subsequent sheets among the sheets are taken out and conveyed. A friction member for preventing the sheet from being separated, a downstream transport path for transporting the sheets separated one by one, and a pair of speed-controllable bites between a separation belt and the downstream transport path. A roller, one or more passage detecting means provided between the separation belt and the jamming roller for detecting the passage of the paper sheet, and provided near the jamming roller to detect an interval between the paper sheets. At least one interval detection unit, comprising: an interval control unit that controls the speed of the jamming roller to control the interval between the sheets, wherein the interval detection unit detects the leading end of the sheet. Stop the suction belt and use the interval detecting means or the When any one of the over-detection means no longer detects the paper sheet, the separation belt starts to be driven, and the jam detection means measures the interval between the paper sheets, and the measured paper sheet If the distance between the sheets is smaller than a preset value, the speed of the jamming roller is temporarily reduced, and the speed of the jamming roller is lowered before the trailing end of the paper sheet leaves the jamming roller. A sheet feeding apparatus comprising a control unit for controlling the speed of the sheet to be substantially the same as the speed of the conveying path. 2. The sheet feeding apparatus according to claim 1, wherein each of the pair of biting rollers is driven. 3. The sheet feeding apparatus according to claim 1, wherein the pair of biting rollers are biting belts formed by winding a belt around the pair of biting rollers. 4. When the speed of the biting roller is higher than the speed of the downstream transport path, the speed of the biting roller is reduced before the leading end of the sheet is bitten into the downstream transport path. 2. The paper sheet feeding device according to claim 1, wherein the speed is controlled to be substantially the same as the speed. 5. The apparatus according to claim 1, wherein the control unit controls the stop of the suction belt after the leading end of the paper sheet is engaged with the engagement roller and the paper sheet is conveyed by a predetermined distance. 6. The paper sheet supply device according to 1.