JPS6216899B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet document conveying device, and more specifically, it separates and feeds sheet documents one by one, guides them to a predetermined position, and then discharges the sheet document from the predetermined position, thereby transporting the front and back sides of the sheet document. The present invention relates to a sheet document general feeding device that reverses a document and guides it to a predetermined position again.

Conventional sheet document general feeders use an arc-shaped closed loop reversing guide in which the sheet document rotates once, in order to invert the sheet document from front to back and guide it back to the exposure platen. Ta. Therefore, with the above-mentioned conventional sheet document conveying device, the sheet document is forcibly deformed greatly by the closed-loop reversal guide, so the sheet document is easily damaged or jammed, and the device tends to be large. It was hot.

Hereinafter, the conventional example will be specifically explained by citing the publication number.

(a) Utility Model Publication No. 55-16600 This publication describes a sheet feeding device that exposes a double-sided sheet of text to the exposure location of a copying machine, and its specific configuration is as follows.

When making a one-sided copy, the text is placed in the hopper in the order of pages, face up, fed from the bottom and returned to the hopper. During double-sided copying, one side is read on the platen, the front and back sides are reversed through a reversing path indicated by a drive roller, and then returned to the platen, where the other side is read.
Thereafter, the originals are returned to the hopper in the original page order through the sheet original reversing guide path.

However, in the configuration of document (a), an arc-shaped closed loop reversing guide that rotates the sheet original once is used to reverse the front and back of the sheet original, so the sheet original is forced to be greatly deformed. It hurts easily.

(b) JP-A-52-149128 This publication discloses a device that turns over a document sheet during each circulation in order to present both sides to a processing section for copying, and details thereof. The structure is as follows.

The double-sided originals are stacked in the first hopper with the pages facing upwards in ascending order. The originals are fed in order from the bottom, turned over, and deposited on the second hopper. The document in the second hopper is fed from below, passed through a guide path, turned over, and the sixth page is directed toward the exposure plate and read. Thereafter, it is directed to a second sheet turning device and guided through a guiding structure into a guiding path. Then, by reverse rotation of the propelling roller, the sheet is again directed toward the exposure plate, and the fifth page is read. Thereafter, when only a portion is to be copied, the pages are returned to the first hopper in the original order through the guide path. On the other hand, when making multiple copies, the sheets are turned upside down by forward and reverse rotation of the propelling roller, and are returned to the second hopper through the guide.

However, in the configuration shown in the document (b), a sheet document ejected from a predetermined position is U-turned and returned in the opposite direction, and after the sheet is reversed, it is ejected from one end opposite to the ejection port again to the predetermined position. Since the device is guided by the position, the device becomes complicated and tends to be large.

In other words, there are rollers on both sides of the platen glass to flip the document upside down and return it to the platen glass, and the distance between these rollers must be greater than or equal to the maximum dimension of the document guided to the platen glass. This is because there is.

(c) Japanese Unexamined Patent Publication No. 52-149127 This publication discloses a copying machine that produces double-sided copying, and its specific configuration is as follows.

The double-sided originals are stacked in the first hopper in ascending order of pages, facing upwards. The originals are fed in order from the top, turned over, and stacked in the second hopper with the youngest pages facing down. At this time, the light passes through the exposure plate but is not read.
Next, the documents are sequentially fed into the second hopper from the bottom, and then returned to the first hopper in the same state. During this time, even-numbered pages (2, 4, 6) of the original are sequentially read by the exposure plate. This operation is repeated to make multiple copies of the same document. Thereafter, the original is returned to the first hopper.
At this time, the front and back sides of the document are inverted, and the pages are stacked in descending order of size, facing downward.
From this state, the documents are fed sequentially from the top and deposited in the second hopper, and then fed sequentially from the bottom, and the odd pages (1, 3, 5) of the document are sequentially read onto the exposure plate.

However, in the configuration shown in document (c), in order to reverse the front and back of the sheet document and guide it to the predetermined position again, the document is circulated in the same direction from one end of the predetermined position to the other end many times. Therefore, it is easy to increase the size.

That is, similar to the reason explained in the above-mentioned document (b), this is because the document conveyance guides are located on both sides of the platen glass.

In addition, once one side of the original has been scanned, it is turned over and placed on a tray, and then guided to the platen again to read the other side, so when circulating multiple originals, , it is not possible to obtain continuous double-sided copies from a single original.

(d) Japanese Unexamined Patent Publication No. 56-36664 This publication describes that double-sided originals loaded on a stack are guided to a platen, one side is read, and then the front and back sides are reversed through an original document inverter and placed in a stack. The original document aligner is shown returning and loading the original and again guiding the original to the platen to read the other side.

However, in the configuration shown in the document (d), as in the above-mentioned document (c), the original image after one side has been read is once loaded onto the stack with the front and back reversed, and then guided to the platen again. Since the other side is read by scanning the original image, if a plurality of original images are stacked on the stack 4, it is not possible to copy both sides of the original image continuously.

The present invention has been made in view of the drawbacks of the above-mentioned conventional examples, and an object of the present invention is to provide a novel sheet document conveying device.

Another object of the present invention is to provide a sheet document conveying device that has a simple configuration and can be made smaller and lighter.

A further object of the present invention is to provide a sheet document general feeding device that can smoothly turn the front and back sides of a sheet document without putting any strain on the sheet document, and that can reduce the size of the device.

The present invention will be explained below based on the drawings.

FIG. 1 is a longitudinal sectional front view showing a schematic configuration of an example of a copying machine equipped with a sheet document conveying device according to the present invention.

The copying machine of this example is broadly divided into a double-sided document circulation device A as a sheet document conveyance device, and a copying machine main body B containing copying process equipment. It is located on the top plate of the case.

(1) Double-sided document circulation device A 1 is the document placement table, 2 is the paper feed belt drive shaft, 2
A is a paper feed belt driven shaft, between which the paper feed belt 3 is placed and rotates in the direction of arrow C in the figure. 4 is a separation belt drive shaft, 4a is a separation belt driven shaft, and a separation belt 5 is placed between them and rotates in the direction of arrow D in the figure. A plurality of sheet-shaped originals placed on the original placing table 1 are separated one by one from the bottom by a paper feed belt 3 and a separation belt 5. 6 is a conveyance roller, and 6a and 6b are rollers that are in pressure contact with the conveyance roller 6, respectively. Reference numeral 7 denotes a conveyor belt driving roller located near the left side of the platen glass 12 disposed on the top plate of the main body of the copying machine, and 7a denotes a conveyor belt driven roller located near the right side of the platen glass 12. A belt 8 is attached. The suspension belt 8 has a lower surface facing the upper surface of the platen glass 12, which is extremely close to the upper surface.
or are in contact with it. Reference numerals 9 and 10 each represent a document switchback mechanism, the details of which will be described later. 1
Reference numerals 1 and 11a denote paper ejecting rollers that eject the copied original onto the original platen 1. Further, the document conveying force of the paper ejection rollers 11 and 11a is weaker than that of the switchback mechanism 10. Therefore, even if the switchback mechanism reverses the rotation, it will not interfere with conveyance.

Reference numeral 59 denotes a double-sided copying cover, which is folded around the shaft 59a to the position shown by the broken line in the figure when obtaining a single-sided copy from a single-sided original or a double-sided copy from a single-sided original; however, when obtaining a double-sided copy from a double-sided original, When the original approaches the switchback mechanism 9, the original appears on the copying machine main body B, so this is to prevent placing objects or touching the copying machine main body from interfering with the switching of the original. It is designed to open at the solid line position in the figure.

Reference numerals 28, 29, 30, and 31 denote optical sensors that detect the leading edge or trailing edge of the original document, which are disposed at required locations on the original circulation path (paper path).

(2) Copying machine main body B 12 is a platen glass, 13 is a photosensitive drum that is rotated in the direction of the arrow around a shaft 13a, 1
4 is a charger, 15 is a developer, 16 is a transfer charger, and 17 is a cleaner. 18 is a cassette for storing copy paper; 19 is a paper feed roller that feeds the copy paper in the cassette one by one;
20 and 20a are register rollers, and 21 is a conveyance belt device that conveys the copy paper after transfer to fixing devices 22 and 22a. 23 is a switchback mechanism 9, 10 in the double-sided original circulation device A;
It is a switchback mechanism with the same function as the . 24
Reference numeral 25 indicates an intermediate tray that stores copy paper after one-sided copying, and a paper refeed roller 25 that refeeds the copy paper from the intermediate tray 24. 26 and 26a are paper ejection rollers that transport the paper after copying to the paper ejection tray 27.
Drain to the top. Reference numerals 32 and 33 denote optical sensors for detecting the leading or trailing edge of the copy paper, which are disposed in the switchback mechanism 23 and the intermediate tray 24, respectively.

(3) Details of the document separating section in apparatus A FIG. 2 is a top view of the document separating section, and FIG. 3 is a side view of the same.

In FIGS. 2 and 3, 60 is a partition plate that separates the original before exposure from the original after exposure. This partition plate 60 is supported by a fulcrum 62 on a partition plate arm 61. Also 6
Reference numeral 3 denotes a friction plate, which is sandwiched between an arm gear 66 engaged with a gear 65 fixed to the separation belt driven shaft 4a and the partition plate arm 61, and rotates the separation belt drive shaft and the driven shaft 4, 4a. By doing so, a load is applied to the partition plate arm 61 in the direction of arrow G (FIG. 3). This facilitates the feeding of the original from the original placing table 1. Further, a roller 67 is attached which receives the load of the partition plate arm 61 via the paper feed belt 3. Reference numeral 70 denotes a spring that is applied between the shaft 68 on the partition plate 60 and the shaft 69 on the partition plate arm 61, so that the line connecting the shafts 68 and 69 crosses the fulcrum 62, so that it moves in the directions of arrows E and F, respectively. Move the partition plate 60. Also, the outer periphery 71 of the partition plate 60
has a cam shape, and when the partition plate 60 and the partition plate arm 61 rotate in the direction of arrow G, the cam 7
The partition plate 60 is configured to be returned to the F direction by a shaft 72 attached at a position where it engages with the partition plate 60. Reference numeral 73 denotes an optical sensor that detects rotation of the partition plate arm 61 in the G direction, thereby making it possible to determine that one cycle of document copying has been completed.

That is, the partition plate 60 exists immediately above the last page of the original placed on the original placing table 1. When the last page is fed, the partition plate 60 comes into contact with the paper feed belt 3, so the frictional force between them causes the partition plate 60 to rotate in the direction of arrow E, and the force of the spring 70 causes the partition plate 60 to be in the state indicated by the two-dot chain line in the figure. become. Here, since a load is applied to the partition plate arm 61 in the direction of arrow G by the friction plate 63, when the partition plate 60 is folded, it starts rotating in the G direction. The paper feed belt drive shaft 2 and the separation belt drive shaft 4 each stop when the trailing edge of the document is detected by the sensor 100 provided on the downstream side of the sheet path a. When it is fed, it will stop at the position indicated by the two-dot chain line in FIG. 3 after rotation. When the feeding of the final page, that is, the partition plate arm 61 is detected by the sensor 73, the final page returns to the original platen 1 after double exposure, and the paper feed belt drive shaft 2 and separation belt continue until one complete cycle is completed. If the drive shaft 4 is stopped and starts rotating at the first page of the second cycle, the partition plate 60 will be placed on top of the last page.

(4) Drive system of device A FIG. 4 is a sectional rear view showing the drive section.
In the figure, 41 is a motor, and 42 is a motor pulley. Also, the conveyance roller 6, rollers 6a and 6b that are in pressure contact with it, and paper ejection rollers 11 and 11a.
Belts 43, 44 for transmitting drive to the pulleys 45, 46, 47 are placed around pulleys 45, 46, 47. Furthermore, 48 is a clutch that transmits drive from the motor 41 to the conveyor belt drive roller 7, and is capable of switching between normal rotation and reverse rotation. 49 is a clutch that transmits the drive from the pulley 47 to the paper feed belt drive shaft 2 and the separation belt drive shaft 4.

Further, belts 50 and 51 for transmitting drive to pulleys 52 and 53 provided in the switchback mechanisms 9 and 10 are wrapped around the pulley 46.

As described above, the driving parts can be concentrated in one place without being separated.

(5) Double-sided original - double-sided copy A plurality of sheet-like double-sided originals with the pages in the same order are placed on the original placing table 1 with the first page facing down or facing up. The placed originals are fed one by one from the bottom by the paper feed belt 3 and separation belt 5, and the fed originals pass through the paper path a (Fig. 1) and are fed by the feeding force of the conveyor belt 8. The document is fed onto the platen glass 12 with the upper image surface facing downward on the document placement table 1. The rear edge of the document is detected by the sensor 28, and after a predetermined timer period has elapsed from that point, the conveyor belt 8 is rotated. dynamic drive is stopped. As a result, the document is automatically positioned and set at a predetermined position on the paper path a on the platen glass 12 surface. When the original is positioned on the platen glass 12, a copying operation on the side of the copying machine main body B is started, and a toner image of the downward image surface of the original on the platen glass 12 is formed on the surface of the photosensitive drum 13. Then, one sheet of copy paper is fed from inside the cassette 18 by a paper feed roller 19. After the fed copy paper passes through paper path b, the toner image on the surface of the photosensitive drum 13 is transferred onto one side of the copy paper, passes through paper path b, and passes through a fixing device to obtain a one-sided copy.

The single-sided copy paper passes through paper paths b and b and enters paper path b of the intermediate tray 24 with the transfer screen facing upward.

On the other hand, after one-sided copying is completed, the original on the platen glass 12 is conveyed from above the platen glass 12 to the paper path a through the paper path a by the reverse rotation drive of the conveyor belt 8. Next, when the trailing edge of the document is detected by the sensor 29, the switchback mechanism 9 switches back and moves from paper path a to paper path a and then to paper path a. Here, when the trailing edge of the document is detected again by the sensor 31, the switchback mechanism 10 switches back and passes from paper path a to paper path a, and the conveyor belt 8, which is currently rotating in the forward direction, transfers the document onto the platen glass 12 again. and is positioned and set at a predetermined position on the platen glass 12. At this time, the side of the document opposite to the side that was previously copied is facing down, and a toner image of that image side is formed on the surface of the photosensitive drum 13.

On the other hand, the copy paper that has been copied on one side earlier and placed in the intermediate tray 24 is re-fed by the re-feed roller 25, passes from paper path b to b, and passes the paper path with the uncopied side facing up. b, and the toner image formed on the surface of the photosensitive drum 13 is transferred onto that surface. Thereafter, it passes through paper path b and fixing devices 22 and 22a, and enters paper path b from paper path b. Here, when the rear end of the copy paper is detected by the sensor 32, it is switched back by the switchback mechanism 23, and the paper is ejected onto the paper ejection tray 27 by the paper ejection rollers 26, 26a through the paper path b. At this time, the paper is ejected with the side that was later copied facing down. That is, a double-sided copy that is the same as the double-sided original is discharged to the paper discharge tray 27.

After double-sided copying, the original on the platen 12 is reversely fed to the left of the platen glass by the reverse rotation of the conveyor belt 8, and enters the paper path a→a.
When the trailing edge of the document is detected by the sensor 29, it is switched back by the switchback mechanism 9 and passes through the paper path a → a to the paper discharge rollers 11,
11a, the original document is returned to the original document mounting table 1, and placed on the uppermost sheet of the stacked originals on the document mounting table 1. The returned document is placed with the same side facing up as it was fed.

Further, in response to the document trailing edge detection signal from the sensor 29, feeding of the next document, that is, the lowest document of the documents placed on the table 1 is started.

By repeating the above operations for the number of originals placed on the document tray, one set (one set) of double-sided copies from the double-sided original is ejected onto the output tray 27 in the same page order as the original. and one cycle is completed.

When the desired number of sets (number of copies) is entered on the operation panel, the same operation is repeated until the predetermined number of copies have been completed, and the desired number of copy sets with the same page order are obtained on the paper output tray. Also, the originals with the same page order are placed on the original placing table.

In order to realize the switchback operation in the switchback mechanisms 9 and 10,
This can be achieved if the trailing edge of the document is engaged with the switchback mechanisms 9 and 10 immediately before the switchback operation is performed. Therefore, no driving force is required at the front edge of the switchback mechanism. In other words, the front edge can be in an open state, and there is no need for a mechanism to cover the size of the document, allowing the apparatus to be provided as compactly as possible. Therefore, at the time of switchback, the leading edge of the document is switched back in the switchback mechanisms 9 and 10 with the leading edge exposed to the outside.

(6) Single-sided original - double-sided copy A plurality of single-sided originals are placed on the original placing table 1 with the image side facing upward. The placed originals are separated one by one starting from the lowest one, and the originals pass through a paper path a and are transferred to a platen glass 1 by a conveyor belt 8.
2 with the image surface facing downward, and is automatically positioned and set at a predetermined position on the platen. Then, a toner image of the downward image surface of the set document on the platen glass 12 is formed on the surface of the photosensitive drum 13.

On the other hand, one sheet of copy paper is fed from the cassette 18 by the paper feed roller 19, passes through the paper path b, reaches the transfer section 16, and the toner image on the surface of the photosensitive drum 13 is transferred to one side of the copy paper. .
The copy paper that has undergone this image transfer passes through paper path b → fuser 22, 22a → paper path b → paper path b → paper path b of the intermediate tray 24 in the same way as in the case of item (5) above, with the image side facing upward. It will be brought in.

The single-sided original on the platen glass 12, which has been copied, is driven back to the left by the reverse rotation of the conveyor belt 8, and is returned to the original table 1 along the path of paper path a → paper path a → paper ejection rollers 11 and 11a. The document is placed on the uppermost sheet of the stacked documents on the table 1 with the image surface facing upward. When the leading edge of the document is detected by the sensor 30 during the returning process, feeding of the next document, that is, the lowest document on the table 1 is started.

When the next document is automatically fed and positioned on the platen glass 12, a toner image of the document image is formed on the surface of the photosensitive drum 13.

On the other hand, the copy paper that has been copied on one side and placed in the intermediate tray 24 is conveyed to the transfer section 16 along the paper path b→b, and the toner image on the photosensitive drum 13 side is transferred to the back side of the paper. Pass b → Fixing device 22, 22a → Paper pass b →
The paper ejection tray 2 is routed by the paper ejection rollers 26 and 26a.
7 and is discharged with the back side facing upward. That is, double-sided copies in which images of two single-sided originals are copied on the front and back sides are discharged onto the tray 27.

By repeating the above operations for the number of originals placed on the original platen 1, a set of double-sided copies from the single-sided original are ejected onto the paper ejection tray 27 in order from the last page, and the copies are placed on the ejection tray 27. be done. Copying a plurality of copies is carried out by setting the required number of copies using the operation section, and then repeatedly transporting the documents stacked on the document tray 1 in a circular manner the required number of copies.

(7) Single-sided original - Single-sided copy The original is transported in exactly the same manner as in the case of obtaining a double-sided copy from a single-sided original in item (6) above. The sheets are separated one by one, pass through paper path a, are transported and positioned onto platen glass 12, and after copying is completed, pass through paper paths a, a and are placed on document tray 1 again before being fed. They are loaded on top in the same direction.

Separate copy paper from cassette 18.
The fed copy paper passes through paper paths b and b, passes through the fixing device, and then passes through paper path b and is placed on the paper discharge tray 27 with the copied side facing upward.

The above-described operations are repeated for the number of originals placed on the original placing table, and one set of one-sided copies from the one-sided original are placed on the paper ejection tray 27 in order from the last page upward.

Copying a plurality of copies is carried out by setting the required number of copies using the operation unit, and then repeatedly conveying the stacked originals on the document tray the required number of copies.

Each mode selection/switching of the above (5), double-sided copy from a double-sided original, (6), double-sided copy from a single-sided original, and (7), single-sided copy from a single-sided original, is made by selecting the mode on the operation panel (not shown). This is made possible by selecting a switch.

The sheet document conveying device according to the present invention has the configuration as described above, and after discharging the sheet document from a predetermined position, the sheet document is reversed in the forward and backward directions twice without passing the sheet document through the separation and feeding means. The sheet original is turned over and guided again to a predetermined position from the side from which it was ejected. As a result, there is no need to deform the sheet original to an extremely large extent in order to reverse the front and back sides, so there is an effect that no stress is applied to the sheet original. Furthermore, since the sheet document reversing guide is configured only on one side when viewed from a predetermined position, the device does not become complicated and can be made smaller. Furthermore, the front and back sides of a double-sided document can be successively guided to a predetermined position.

In addition, the entire automatic document feeder can be made more compact by having a configuration in which the document is guided to a predetermined position while being reversed, the document is ejected from the guided side, and the document is returned to the stacking section while being reversed. In addition to being able to organize the drive mechanism compactly. That is, this is because, for example, the components such as the reversing means can be assembled mainly on one side of a predetermined position. Also,
It is also possible to downsize the automatic document recoil device. In other words, for example, even if the document reading position is lengthened in the length direction to read a large-sized document, the entire automatic document conveying device does not need to be large.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing a schematic configuration of an example of a sheet document conveying device according to the present invention, FIG. 2 is a top view of the document separating section, FIG. 3 is a side view of the same, and FIG. 4 is a view of the drive section. Cross-sectional rear view. A is the document circulation device, B is the copying machine main body, 1 is the document placement table, 3 is the paper feed belt, 5 is the separation belt, a
~a is a document conveyance path (paper path), and bb is a copy paper conveyance path (same).

Claims (1)

[Scope of Claims] 1. A stacking unit 1 for stacking sheet originals; separation and feeding means 3 and 5 for separating and feeding the sheet originals stacked on the stacking unit one by one; the separation and feeding unit 3; A sheet path a, which guides the sheet original fed by 5 to a predetermined position 12;
a, the sheet original discharged from the predetermined position 12 is reversed twice in the forward and backward direction of conveyance without passing through the separation and feeding means 3 and 5, and the front and back of the sheet original are reversed. Sheet reversal path a, a, leading from the ejected side to the above predetermined position again
A sheet document conveying device comprising: a, a, and the following. 2 Sheet reversal paths a, a, a, a are first sheet reversal paths a, a, which switch back the sheet document discharged from the predetermined position 12;
a, and a second sheet reversing path a, in which the sheet original that has been switched back and guided by the first sheet reversing path a, a is switched back again, and the sheet original with the front and back sides reversed is guided to the predetermined position 12, The sheet document conveying device according to claim 1, comprising: a; 3. A stacking unit 1 for stacking sheet originals; separation feeding means 3 and 5 for separating and feeding the sheet originals stacked on the stacking unit one by one; A first sheet path a that guides the sheet original by reversing its front and back sides, a second sheet path a that guides the sheet original guided by the first sheet path a to a predetermined position 12, and returns it in the opposite direction. The sheet original discharged from the predetermined position 12 is not passed through the separating and feeding means 3 and 5, but its conveying direction is reversed back and forth twice to turn the sheet original upside down, and the side from which the sheet original is discharged is A sheet document conveying device comprising: a sheet reversing path a, a, a, a for guiding the sheet from the sheet to the predetermined position 12 again. 4. The sheet original conveying device according to claim 3, wherein the sheet reversing paths a, a, a, a, a are provided with switchback mechanisms 9, 10 for reversing the conveying direction of the sheet original. 5 Sheet reversal path a, a, a, a is
a first sheet reversal path a for switching back the sheet document discharged from the predetermined position 12;
a, and a second sheet reversing path a, in which the sheet original that has been switched back and guided by the first sheet reversing path a, a is switched back again, and the sheet original with the front and back sides reversed is guided to the predetermined position 12, The sheet document conveying device according to claim 4, comprising: a. 6 a stacking section 1 for stacking sheet originals; separation feeding means 3 and 5 for separating and feeding the sheet originals stacked on the stacking section one by one; a first sheet path a that guides the sheet original by reversing its front and back sides; a second sheet path a that guides the sheet original guided by the first sheet path a to a predetermined position 12; Then, the sheet original discharged from the predetermined position 12 is not passed through the separating and feeding means 3 and 5, but the conveying direction is reversed twice to turn the sheet original upside down, and the sheet original is discharged. a sheet reversing path a, a, a, a, which guides the sheet original from the side to the predetermined position 12 again, and a sheet reversing path a, a, a, a, which guides the sheet document that is returned in the opposite direction and is discharged from the predetermined position 12 from the separation feeding side to the stacking section. A sheet document conveying device comprising three sheet paths a and a. 7. The sheet original conveying device according to claim 6, wherein the sheet reversing paths a, a, a, a, a are provided with switchback mechanisms 9, 10 for reversing the conveying direction of the sheet original. 8 Sheet reversal path a, a, a, a is
a first sheet reversal path a for switching back the sheet original discharged from the predetermined position 12;
a, and a second sheet reversing path a, in which the sheet original that has been switched back and guided by the first sheet reversing path a, a is switched back again, and the sheet original with the front and back sides reversed is guided to the predetermined position 12, The sheet document conveying device according to claim 7, comprising: a. 9 a stacking section 1 for stacking sheet originals; separation feeding means 3 and 5 for separating and feeding the sheet originals stacked on the stacking section one by one; Sheet paths a, a that reverse the front and back of the sheet original and guide it to a predetermined position 12, and convey the sheet original that is returned from the predetermined position 12 in the opposite direction and is discharged without passing through the separation and feeding means 3 and 5. A sheet reversing path a, a, a, a capable of reversing the direction back and forth twice to reverse the front and back of the sheet original and guiding the sheet original from the ejected side to the above-mentioned predetermined position again. , When processing only one side of a sheet original, the sheet original is reversed from front to back and guided to the above-mentioned predetermined position by sheet paths a, a, and then returned from the above-mentioned predetermined position in the opposite direction, and then the sheet original is returned to the above-mentioned predetermined position in a part a of the above-mentioned sheet reversing pass. , a, and then turn it upside down and place it in the loading section 1.
A sheet document conveying device characterized by a sheet document conveying device.