JPH0616193B2 - Circulating automatic document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is intended to obtain a copy sheet for double-sided copying (double-sided transfer) from a sheet-shaped double-sided original, and particularly when the copy sheet for double-sided copying is taken from a single-sided original, the copy sheets are arranged in page order. The present invention relates to a document feeder that discharges all of them.

Conventionally, in a circulation type automatic document feeder, when a double-sided copy function is connected, a sheet-shaped single-sided original is fed from the last page from one original stacking table, and a double-sided copy sheet is obtained from the single-sided original. When there are an odd number of sheet-shaped one-sided originals, it is necessary to know whether the sheet-shaped one-sided originals are an odd number or an odd number in order to make the back side of the last page of the copy paper a blank space. Therefore, first, a method is adopted in which a plurality of sheet-shaped single-sided originals are sequentially fed and circulated, and the number of the single-sided originals is counted.

However, in the above method, since the one-sided original document circulates on the original document platen and returns to the original position, the time loss increases and the conveyance of the one-sided original document is unstable. There is.

The present invention has been made in view of the above-mentioned problems of the prior art. It is possible to count the number of single-sided sheet originals in a short time and reduce the time loss. An object of the present invention is to provide a circulating type automatic document feeder which improves the stability in conveying a single-sided sheet original when determining whether the original is an even number.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, in FIG. 1, A is a circulating type document feeder, and B is a copying machine main body capable of making double-sided and single-sided copy sheets. Reference numeral 1 denotes a first document stacking table, which descends to the left side and is inclined. A feeding roller 2a is provided adjacent to the left side of the first document stacking table 1, the feeding belt 3 is wrapped around the feeding roller 2a, and the feeding roller 2 is attached to the other end of the feeding belt 3. The feeding belt 3 is wound around the feeding rollers 2a, 2 and rotates in the direction of arrow C. Feed rollers 2a, 2
Is rotated in the same direction as the rotation direction of the feeding belt 3 (direction of arrow C). 4, 4a are separation rollers, which are arranged in a row above the left feeding roller 2 and a separation belt 5 is wound around these two separation rollers 4, 4a.
The separation belt 5 rotates in the direction of arrow D. In this way, the separation belt 5 and the feeding belt 3 separate one sheet from the lowermost portion of a plurality of sheet-shaped originals (sheet originals) placed on the first original stacking table 1. A conveying roller 6 is located on the lower left side of the feeding roller 2. Reference numerals 6a and 6b are rollers that press the conveying roller 6 against each other, and are located on the right and left sides of the conveying roller 6, respectively. Reference numeral 7 denotes a conveyor belt driving roller, which is directly below the feeding roller 2. Then, the conveyor belt drive roller 7 rotates in both forward and reverse directions. 7a is a conveyor belt driven roller, and a conveyor belt 8 is wound around the conveyor belt driving roller 7 and the conveyor belt driven roller 7a. The above-mentioned conveyor belt driven roller 7a is at the side end of the circulation type document feeder A. A feeding roller 9a is located on the upper left side of the roller 6, and a separation roller 9b is in pressure contact with the upper portion of the feeding roller 9a. Reference numeral 10 is a switchback mechanism, the details of which will be described later. The above-mentioned transport roller 6, rollers 6a, 6
b, the feeding roller 9a, the separation roller 9b, and the switchback mechanism 10 constitute a double-sided document reversing / reversing mechanism. Reference numerals 11 and 11a denote two paper discharge rollers. The paper discharge roller 11a is provided above the separation roller 4a, and the paper discharge roller 11 is pressed against the paper discharge roller 11a. The paper discharge rollers 11a, 11 have a function of discharging the copied document onto the first document stacking table 1, and the conveyance force of the paper discharge rollers 11a, 11 is that of the switchback mechanism 10. Is weaker than. Three
Reference numeral 4a denotes a second document stacking table provided on the left side of the feeding roller 9a and the separating roller 9b, and this second document stacking table 34a.
The auxiliary feeding roller 35 near the feeding roller 9a at the right end of the
There is a. The above-mentioned feeding roller 9a and separation roller 9b
This constitutes a separating device for the second original stacking table 34a, and the separating device also serves as the reversing / reversing mechanism for double-sided originals as described above. The auxiliary feeding roller 35a, the feeding roller 9a, and the separating roller 9b constitute a feeding unit that separates and feeds one-sided originals on the second original stacking table 34a one by one. Further, the feeding roller 9a and the separating roller 9b, which are a part of the feeding means, constitute a part of a reversing and reversing mechanism for reversing the front and back of the read double-sided sheet document and guiding it to the reading device again. . A sensor 28 is provided below the conveyor belt driving roller 7 and the roller 6a, a sensor 29 is provided on the right side of the separation roller 9b, a sensor 30 is provided above the roller 6b, and a sensor 31 is provided on the lower left side of the switchback mechanism 10. There is. The sensor 29 is the second document stacking table 3
4a through a fifth original paper path Va described below
It is a counting unit that counts the number of single-sided originals that move to the original stacking table 1. The feeding roller 9a and the separating roller 9b
Can be rotated both forward and backward via a clutch (not shown). The first original paper path I is provided between the left feeding roller 2, the roller 6a and the conveyor belt driving roller 7, the second original paper path IIa is provided below the conveyor belt 8, and the third original paper path IIIa is provided. The fourth original paper path IVa is provided between the feeding roller 9a, the roller 6b and the conveyance belt driving roller 7, and the fifth original paper path V is provided between the feeding roller 9a and the separating roller 9b.
a is between the separation roller 9b and the switchback mechanism 10,
The sixth original paper path VIa is provided between the switchback mechanism 10 and the paper discharge roller 11, and the seventh original paper path VIIa is provided between the first original paper path Ia and the third original paper path IIIa.

Next, the copying machine body B will be described.

Reference numeral 12 denotes a platen glass which is a document platen, which is located below the transport belt 8 and which has the above-described second document sheet path.
IIa is formed between the conveyor belt 8 and the platen glass 12. A photosensitive drum 13 is located below the platen glass 12. 14 is a charger, which is above the photosensitive drum 13, 15 is a developing device, 16 is a transfer charger, and 17 is a cleaner, which are provided around the photosensitive drum 13, respectively. 18 is a paper feed cassette, which is the photosensitive drum 1
3 is on the right side of 3, and 19 is a fan-shaped sheet feeding roller, which is located on the upper left side of the sheet feeding cassette 18. The register rollers 20 and 20a are provided between the photosensitive drum 13 and the paper feed cassette 18, and the register roller 20a is in pressure contact with the lower surface of the register roller 20. Reference numeral 21 denotes a copy paper transport belt that transports the copy paper after transfer to the fixing rollers 22 and 22a. The copy paper transport belt 21 is wound around a pair of rollers and is located on the left side of the photosensitive drum 13. The fixing rollers 22, 22 are provided on the left side of the copy paper transport belt 21.
a, and the fixing roller 22 is pressed against the upper surface of the fixing roller 22a. Reference numeral 24 is an intermediate tray for storing copy paper after one-sided transfer, and this intermediate tray 24 is the photosensitive drum 1
It is disposed below 3 and inclined toward the left side. Reference numeral 25 denotes a sheet re-feeding roller for re-feeding the single-sided copy sheets stored in the intermediate tray 24, which is adjacent to the right side of the intermediate tray 24. Reference numerals 26 and 26a denote copy sheet discharge rollers, which are on the left side of the fixing rollers 22 and 22a, and one copy sheet discharge roller 26 is in pressure contact with the upper surface of the other copy sheet discharge roller 26a. Reference numeral 27 denotes a paper discharge tray for storing the copy paper after the completion of transfer, which is arranged on the left side of the copy paper discharge rollers 26a, 26. First
The copy paper path Ib is located between the paper feed roller 19 and the register rollers 20 and 20a, the first copy paper path IIb is located above the copy paper transport belt 21, and the third copy paper path Ib.
IIIb is curved in a semi-circular shape toward the lower right and is connected to the left side of the fixing roller 22a, the fourth copy paper path IVb is connected to the right side of the third copy paper path IIIb, and is connected to the lower side of the copy paper conveyance belt 21. is there. The fifth copy paper path Vb is located on the intermediate tray 24, is curved at the right end of the above-mentioned fourth copy paper path IVb, and is connected to the fifth copy paper path Vb. Sixth
The copy paper path VIb is located between the re-feed roller 25 and the register rollers 20 and 20a, is curved to the lower left, and is connected to the fifth copy paper path Vb. The eighth copy paper path VIIIb is horizontally provided between the fixing rollers 22a and 22 and the copy paper discharging rollers 26a and 26, and is connected to the upper end of the third copy paper path IIIb on the left side of the fixing rollers 22a and 22. is doing. 7th copy paper path VII
b is the eighth copy paper path VIIIb and the third copy paper path IIIb
Between Reference numerals 32 and 33 denote optical sensors that detect the leading edge or the trailing edge of the copy sheet in the moving direction.
Is below the fixing roller 22 a, and the optical sensor 33 is between the intermediate tray 24 and the re-feeding roller 25.

Next, with reference to FIG. 2 and FIG. 3, a document separating section to which an embodiment of the present invention is applied will be described.

In FIG. 2 and FIG. 3, 34 and 34 are partition plates, and these partition plates 34 and 35 are for distinguishing a document before exposure (before reading) from a document after exposure (after reading),
It is arranged on both outer sides of the feeding belts 3, 3. Partition plate arms 35 and 35 are pivotally attached to the left and right sides of the partition plates 34 and 34 at fulcrums 36 and 36, respectively. The partition plates 34, 34 rotate about fulcrums 36, 36 in the directions of arrows E and F in FIG. Further, 37 and 37 are friction plates, which are gears 3 fixed to both ends of the shaft of the separating roller 4a.
Arm gears 40, 40 engaged with 9a, 39a, respectively
And the partition plate arms 35, 35, and when the separation rollers 4, 4a rotate and the feeding belts 3, 3 come into contact with the partition plates 34, 34, the partition plate arms 35, 3
5 rotates in the direction of arrow G in FIG. This promotes document feeding from the first document stacking table 1. In addition, the partition plate arm 35,
Rollers 41, 41 receiving the load of 35 are provided on the lower surfaces of the feeding belts 3, 3, respectively. 44, 44 are pin shafts 38, 38, 39, which are erected on the partition plates 34, 34,
The springs 44, 44 are provided between the springs 39 and 39 and cross the fulcrums 36, 36. As a result, the partition plates 34, 34 can be rotated in the directions of arrows E and F in FIG. Peripheries 45, 45 of the partition plates 34, 34
Has a cam shape, and when the partition plates 34, 34 rotate in the direction of arrow E in FIG. 2 and the partition plate arms 35, 35 rotate in the direction of arrow G in FIG. 34,34
So that the shafts 46, 46 return in the direction of arrow F in FIG.
Is orthogonally arranged below the feed belts 3 and 3 in FIG. Reference numeral 47 denotes an optical sensor, which is the feeding belts 3, 3
Below. The optical sensor 47 is the partition plate arm 3
The rotation of the partition plate arms 35, 35 is detected when 5, 5 are rotated in the direction of arrow G in FIG. 3, and this indicates that one cycle of document copying is completed. In FIG. 3, reference numeral 48 denotes a sensor, which is the partition plate arm 3
After the light sensor 5 and the light sensor 35 are detected by the optical sensor 47, they are located at the positions indicated by the chain line in FIG.

Next, the drive unit will be described with reference to FIG.

In FIG. 4, 49 is a motor, 50 is a motor pulley provided on the motor 49,
A belt 51 is wound around a pulley 53 and a pulley 55 that are coaxial with the paper discharge roller 11a. A belt 52 is wound around the pulley 55 and a pulley 54 coaxial with the conveying roller 6, while a pulley 54 coaxial with the conveying roller 6 and a roller 53a.
The belt 59 is hung on the pulley 61 coaxial with
The roller 61a is pressed against the roller 53a, and the roller 61a
a drives the switchback mechanism 10. Feed roller 9
A belt 58 is wound around a pulley 60 coaxial with a and a pulley 54 coaxial with the conveying roller 6, and a pulley 52a coaxial with the separating roller 9b and a belt 6 with the pulley 60.
2, the pulley 60a is capable of forward and reverse rotation.
A clutch 57 is in pressure contact with the separation roller 4 and the pulley 55, and transmits the power of the motor 49 to the separation roller 4. Reference numeral 56 denotes a clutch, which is in pressure contact with the motor pulley 50 and the conveyance belt drive roller 7, and
Switch between forward and reverse rotation of.

Further, the feeding of the final pages of a plurality of originals will be described with reference to FIGS. 2 and 3.

There are partition plates 34, 34 just above the last page. When the last page is fed, the partition plates 34, 34 are fed by the feeding belt 3,
3, the partition plates 34, 3 are contacted by frictional force between them.
4 rotates in the direction of arrow E in FIG. 2, and is brought into the state of the chain double-dashed line in FIG. 2 by the force of the springs 44, 44. Since a load is applied to the partition plate arms 35, 35 by the friction plates 37, 37 in the direction of arrow G, the partition plates 34, 34 rotate in the direction of arrow E in FIG. And partition plate 3
4, 34 and the partition plate arms 35, 35 are overlapped with each other and indicated by an arrow G.
Rotate in the direction. Then, the feeding roller 2 and the separation roller 4 have a sensor 4 whose rear end is at the rear end of the separation roller 4.
When it is detected by 8, each stops. Therefore, the partition plate arms 35, 35 rotate after the document of the last page is fed, and then stop at the broken line in FIG. 3, and the partition plates 34, 34 are folded by the partition plate arms 35, 35. . When the last page of the document is fed, that is, when the partition plate arms 35, 35 are detected by the sensor 47, the last page is returned to the first document stacking table 1 after exposure, and the feeding roller is fed until one cycle is completed. 2 and the separation roller 4 are stopped and started to rotate at the first sheet in the second cycle, the partition plates 34, 34
Will be placed on the last page of the manuscript. Incidentally, the known exposure scanning optical system includes the light source 12a and the first mirror 13 shown in FIG.
a, second mirror 13b, lens 12b, third mirror 13
c and the fourth mirror 13d.

Next, the operation of obtaining a double-sided copy sheet from a double-sided original will be described with reference to FIG.

First, a plurality of double-sided originals on the first original stacking table 1 are fed one by one by the feeding belt 3 and the separation belt 5 to the paper feeding belt 3 from the bottom of the double-sided original, and the fed double-sided originals are fed. The original passes through the first original paper path Ia, is inverted, and is placed on the platen glass 12 with the upper surface of the first original stacking table 1 facing downward. At this time, the stop position of the double-sided document is determined by the sensor 28 which detects the trailing end of the double-sided document in the moving direction and which is set by a preset clock signal. When the double-sided original is positioned on the platen glass 12, the copying operation of the copying machine body B is started, and the copy paper is fed from the paper feed cassette 18 to the paper feed roller 19
Will feed one sheet. Copy paper fed is first
After passing through the copy paper path Ib, the image is transferred, and then passes between the second copy paper path IIb and the fixing rollers 22 and 22a to obtain a single-sided copy paper. The single-sided copy paper is the third
Intermediate tray 2 after passing the fourth copy paper path IIIb, IVb
Enter 4. At this time, the transferred surface of the one-sided copy paper faces upward.

On the other hand, the double-sided original is conveyed from the platen glass 12 to the fourth original paper path IVa through the third original paper path IIIa after the completion of the single-sided copy, that is, after the reading. At this time, the feeding roller 9a rotates counterclockwise and the separation roller 9b rotates clockwise. Next, when the sensor 29 detects the trailing end of the double-sided original in the moving direction, the feeding roller 9a and the separating roller 9b rotate in reverse, and the double-sided original moves from the fourth original paper path IVa to the fifth original paper path Va. After passing, it is transferred to the sixth original paper path VIa. At this time, when the rear end of the double-sided original in the moving direction is detected by the sensor 31, the double-sided original is switched back by the switchback mechanism 10, passes from the sixth original paper path VIa to the seventh original paper path VIIa, and again. It is sent onto the platen glass 12. At this time, in the double-sided original, the surface opposite to the previously copied surface is facing down, and the opposite surface is copied. Therefore, the double-sided original has both sides copied at this point. The double-sided originals on the platen glass 12 for which double-sided copying has been completed are the third and fourth original paper paths IIIa and IV.
It passes through a and is inverted as described above. When the sensor 29 detects the leading edge of the double-sided original in the moving direction, the feeding of the next double-sided original, that is, the lowermost double-sided original on the first original stacking table 1, is started. The double-sided original after the switchback after the double-sided copying is completed is the fifth and sixth original paper path V.
After passing through a and VIa, the sheet is again placed on the top of the double-sided original on the first original stacking table 1 by the paper feed rollers 11 and 11a. At this time, the double-sided original is placed with the same side as that when it is fed up. On the other hand, regarding the copy paper, the copy paper is contained in the intermediate tray 24 with the transferred surface facing up. After the single-sided transfer, copy paper is the most paper feed roller 2.
5, the sheet is re-fed, passes from the fifth copy sheet path Vb to the sixth copy sheet path VIb, and the untransferred surface faces up and is carried into the first copy paper path Ib to be transferred. After that, the copy paper passes between the second copy paper path IIb and the fixing rollers 22 and 22a, and the third copy paper path III.
b, the fourth copy paper path IVb is entered. After that, the copy paper is discharged from the fourth copy paper path IVb to the seventh copy paper path VIIb onto the paper discharge tray 27 by the copy discharge paper rollers 26 and 26a. At this time, the copy paper is ejected with the transferred side facing down.

By repeating the above-described operation for the number of originals placed on the first original stacking table 1, one set of double-sided copy paper obtained from one set of double-sided originals is output to the discharge tray 2
Since one set of double-sided originals are placed in the same page order on the sheet 7, one cycle is completed. If the desired number of sets is set on the display unit (not shown), the same operation is repeated for the same number of cycles, and the desired number of sets of double-sided copy paper are set on the discharge tray 27 in page order. In addition, a double-sided original arranged in page order is placed on the first original stacking table 1.

Next, the operation of obtaining a double-sided copy sheet from a single-sided original will be described.

When a double-sided copy sheet is to be obtained from a single-sided original, the surface on which a plurality of single-sided originals are to be copied is placed on the second original stacking table 34a. The plural one-sided originals are separated one by one from the lowermost part. That is, the feeding and replenishing roller 35a and the feeding roller 9a rotate in the clockwise direction, and the separating roller 9b rotates in the counterclockwise direction, so that the single-sided original separated from the bottom is fed to the fifth and sixth original paper paths Va, VIa. And is sequentially loaded onto the first document stacking table 1 by the discharge rollers 11 and 11a. At this time, the sensor 29, which is a counting unit, confirms the one-sided original document, counts the number of the one-sided original document, and determines whether the number is an even number or an odd number. As is apparent from the above description, the fifth original paper path Va and the sixth original paper path VIa allow the one-sided originals to pass from the second original stacking table 34a to the first original stacking table 1 without passing through the platen glass 12. The transport path is configured to guide the sheet without inverting.

The lowermost single-sided document placed on the first document stacking table 1 is fed by the feeding belt 3 and the separation belt 5, and the fed single-sided document passes through the first document sheet path Ia and the platen glass 12 is fed. Placed on top. When the number of single-sided originals is determined to be an even number by the counting means, the first single-sided original from the bottom of the plurality of single-sided originals placed on the first original stacking table 1, that is, the first original is sent first. Single-sided originals are not copied, and promptly pass the 7th and 6th original paper paths.
After passing through VIIa and VIa, the discharge rollers 11 and 11a
The original document surface is discharged onto the first document stacking table 1 as it is. Next, the second single-sided original from the bottom is sent to the platen glass 1
When it is placed on the paper feeding roller 1, the copying operation of the copying machine main body B is started, and the copy paper is fed from the paper feeding cassette 18 to the paper feeding roller 1.
9 feeds one sheet. The fed copy paper is transferred after passing through the first copy paper path Ib, passes between the fixing rollers 22 and 22a through the second copy paper path IIb, and a one-sided copy paper is obtained. The single-sided copy paper is the third,
Intermediate tray 2 after passing the fourth copy paper path IIIb, IVb
Enter 4. At this time, the transfer surface of the copy paper is facing upward. On the other hand, for the single-sided original, after the single-sided copying is completed, the seventh and sixth original paper path VI is passed from the platen glass 12
After passing through Ia and VIa, the sheets are again placed on the uppermost part of the original on the first original stacking table 1 by the paper discharge rollers 11 and 11a. After that, the next single-sided original to be fed (the third single-sided original from the bottom) is conveyed onto the platen glass 12,
As in the case of the first sheet from the bottom, the copying machine body B is not interlocked with this one-sided original, and the conveyed one-sided original is immediately returned to the first original stacking table 1. Hereinafter, only the even-numbered one-sided originals counted from the bottom are copied onto the copy sheet, and the odd-numbered one-sided originals are ejected without being copied. Due to the above-described document feeding, copy sheets having one surface transferred are stacked on the intermediate tray 24 in the copying machine body B with the transfer surface facing upward.
As described above, after the one-sided transfer is completed by the first original feeding, the transfer is performed on the back surface (non-transferred surface) of the copy paper by the second original feeding. In other words, in the second document feeding, only the first, third, fifth, ... Odd-numbered one-sided documents from the bottom are copied, and the second, fourth, sixth, ... The even-numbered one-sided original is ejected without being copied. When the lowermost (first from the bottom) single-sided original of a plurality of single-sided originals is placed on the platen glass 12, the copying operation of the copying machine main body B is started, and the copy paper is fed from the paper feed cassette 18. One sheet is fed by the feeding roller 19 to be transferred, and after being transferred, the sheet is ejected onto the sheet ejection tray 27 by the sheet ejection rollers 26 and 26a. On the other hand, the one-sided original on the platen glass 12 passes through the seventh and sixth original paper paths VIIa and VIa and is discharged onto the first original stacking table 1. Next, the second one-sided original document from the bottom is ejected without being copied, and when the third one-sided original document from the bottom is placed on the platen glass 12, the intermediate tray 24 in the copying machine body B is The 5th and 6th bottom copy papers (two single-sided originals have already been transferred to the top surface)
Transferred after passing through the copy paper paths Vb and VIb, passing between the second copy paper path IIb and the fixing rollers 22 and 22a, and discharged to the discharge tray 27 by the discharge rollers 26 and 26a.
Thereafter, the odd-numbered one-sided originals from the bottom are sequentially transferred onto the copy paper in the intermediate tray 24 and discharged.

The above-described operation is performed, and one set of double-sided copy paper obtained from a plurality of single-sided originals is placed on the discharge tray 27 in the order of pages.

The above operation is performed for the odd-numbered one-sided original, but the same operation is performed for the even-numbered one-sided original.

For even-numbered one-sided originals, the first, third, fifth, ... To copy the even-sided single-sided original. However, for feeding the second copy paper in the copying machine main body B, the intermediate tray 24
The copy paper for single-sided copying is fed, transferred, and then ejected.

Next, the operation of obtaining a single-sided copy sheet from a single-sided original will be described.

Among the single-sided originals on the first original stacking table 1, the uppermost single-sided originals are sequentially separated one by one, and the first original paper path I
After passing a, transfer is performed on the copy paper on the platen glass 12. After this, the single-sided originals are the seventh and sixth original paper path VII.
After passing through a and VIa, it is stacked again on the first document stacking table 1 in the same direction as the state before being fed, on the uppermost part of the one-sided document. The copy paper is separated from the paper feed cassette 18, and the supplied copy paper passes between the first and second copy paper paths Ib and IIb and between the fixing rollers 22 and 22a, and then the eighth copy. It is placed on the discharge tray 27 through the paper path VIIIb with the transfer surface facing upward.

As described above, switching from a double-sided original to a double-sided copy paper, a single-sided original to a double-sided copy paper, or a single-sided original to a single-sided copy paper can be performed by selecting a mode with an operation unit (not shown) of the copying machine body B. There is.

Since the present invention is configured as described above, the number of single-sided sheet originals when the single-sided sheet originals are moved from the second original stacking table to the first original stacking table without being turned over without being circulated. Since the one-sided sheet manuscript does not hurt, the calculation can be done in a short time, the time loss can be reduced, that is, the speed can be increased, and the one-sided sheet manuscript does not pass on the manuscript platen during the calculation.
This has the effect of improving the stability in conveying a single-sided sheet document.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a detailed top view of a separating portion in this embodiment, FIG. 3 is a detailed side view of the separating portion in this embodiment, and FIG. It is a detailed side sectional view of a drive part in an example. DESCRIPTION OF SYMBOLS 1 ... 1st original stacking table, 2 ... Feeding roller 2a ... Feeding roller, 3 ... Feeding belt, 4, 4a ... Separation roller, 5 ... Separation belt, 6 ... Conveying roller, 6a, 6b ... Roller, 7 ... Transport belt driving roller, 7a ... Transport belt driven roller, 8 ... Transport belt, 9a ... Feed roller, 9b ... Separation roller, 10 ... Switchback mechanism, 11, 11a ... Discharge roller, 12 ... Platen glass, 12a ... Light source , 12b ... Lens, 13 ... Photosensitive drum, 13a ... First mirror, 13b ... Second mirror, 13c ... Third mirror, 13d ... Fourth mirror, 14 ... Charging device, 15 ... Developing device, 16 ... Transfer charging device, 17 ... Cleaner, 18 ... Paper feed cassette, 19 ... Feed roller, 20, 20a ... Register roller, 21 ... Copy paper transport belt, 22, 22a ... Fixing roller, 24 ... Intermediate tray, 2 ... Refeeding roller, 26, 26a ... Copy paper discharging roller, 27 ... Paper discharging tray, 28, 29, 30, 31, 32, 33 ... Sensor 34, 34 ... Partition plate, 34a ... Second document stacking table, 35, 35 ... Partition plate arm, 35a ... Auxiliary feeding roller, 36, 36 ... Support point, 37, 37 ... Friction plate, 38, 38, 39, 39 ... Pin shaft, 39a, 39b ... Gear, 40, 40 ... Arm gear , 41, 41 ... Roller, 44, 44 ... Spring, 45, 45 ... Outer circumference, 46, 46 ... Shaft, 47 ... Optical sensor, 48 ... Sensor, 49 ... Motor, 50 ... Motor pulley, 51 ... Belt, 52 ... Belt, 52a ... pulley, 53 ... pulley, 53a ... roller, 54 ... pulley, 55 ... pulley, 56 ... clutch, 57 ... clutch, 58 ... belt, 59 ... belt, 60 ... pulley, 61 ... pulley, 61a ... Roller, Ia, IIa, IIIa, IVa, Va, VIa, VIIa ... First,
2nd, 3rd, 4th, 5th, 6th, 7th manuscript paper paths, Ib, IIb, IIIb, IVb, Vb, VIb, VIIb, VIIIb
... 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th copy paper paths, A ... Circulating document feeder, B ... Copier body.

Claims (2)

[Claims] 1. A circulation in which a sheet original is supplied to the original platen one by one from a plurality of sheet originals stacked on a first original stacking table and read, and then the sheet original is returned to the first original stacking table. In the automatic type automatic document feeder, a second original stacking table, which is separate from the first original stacking table, and on which a plurality of single-sided sheet originals are placed when copying a single-sided sheet original onto copy paper, Feeding means for separating and feeding single-sided sheet originals one by one on the original stacking table, and single-sided sheet originals from the second original stacking table to the first original stacking table without passing through the original platen. And a conveying path for guiding the sheet without reversing the sheet, and when a single-sided sheet original moves from the second original stacking table to the first original stacking table, the number of single-sided sheet originals is calculated to determine whether it is an odd number or an even number. And a counting means for Circulating automatic document feeder according to claim. 2. A reversing / reversing mechanism for reversing the front and back of a double-sided sheet document after reading and guiding it to the reading device again. A circulating automatic document feeder according to the item.