JPS6216898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for transporting sheet originals, and more particularly, to separating and feeding sheet originals one by one, guiding the sheet originals to a predetermined position, and then ejecting the sheet originals from the predetermined position. The present invention relates to a method and apparatus for conveying a sheet document by reversing the front and back sides of the document and guiding it to a predetermined position again.

Traditionally, devices of this type have been used, for example, to load a stack of pages that make up a multi-page document into a supply tray that is placed above an exposed platen on the outside of a copier for original documents. Repeatedly pull out the lowest page of the pages supported with the side to be copied facing upward and guide the page from the bottom of the supply tray to the exposed platen. After that, the original sheet is ejected from the exposure platen, and the original sheet is turned over and guided to the exposure platen again. In particular, an arcuate closed-loop reversal guide that rotates the sheet document once has been used as a structure for reversing the front and back sides of the sheet document.

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 discloses a sheet feeding device that exposes a double-sided sheet of text to an 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), since 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, the sheet original is forcibly deformed to a large extent and easily damaged. .

(b) JP-A-52-149128 This publication discloses a device that turns the original sheet inside out during each circulation in order to instruct the processing section for copying to do both sides, 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 accumulating roller, the sheet is again directed toward the exposure plate, and the fifth page is read. after that,
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 accretion 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 that turn the document upside down and return it to the platen glass, and the distance between these rollers is set to be greater than or equal to the maximum dimension of the document guided to the platen glass. This is because it is necessary.

(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 in the second hopper are sequentially fed from the bottom and 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), the original sheet is circulated in the same direction many times from one end of the predetermined position to the other end in order to reverse the front and back of the sheet original and guide it to the predetermined position again. Therefore, the configuration is complicated and it is easy to increase the size.

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

(d) Japanese Unexamined Patent Publication No. 56-36664 This publication describes that both originals loaded on a stack are led to a platen, one side is read, and then the front and back sides are reversed via an original document inverter and the originals are stacked. An original document aligning device is shown which loads the originals back to the platen and again guides the originals to the platen to read the other side.

However, in the configuration shown in document (d), the original document stack and the platen are arranged side by side in the horizontal direction, so the device tends to be large in the horizontal direction.
In other words, both the stack and the platen need to have a length that matches the maximum size of the document to be used.

The present invention has been made in view of the above-mentioned disadvantages of the conventional example, and provides a sheet document conveying method and device that can smoothly turn the front and back sides of a sheet document without putting strain on the sheet document, and can reduce the size of the device. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1, 2, 3, and 4 illustrate one embodiment of the present invention.

FIG. 1 is a sectional view of an automatic document circulation device of the present invention. In FIG. 1, reference numeral 1 denotes a feeding tray on which documents are stacked and set. Further, reference numerals 2 and 2a denote feeding rollers that rotate the feeding belt 3 in the direction of arrow A to feed the original. Separation rollers 3 and 3a rotate the separation belt 5 in the direction of arrow B to separate the document from the feed belt 3. Also, the first seat pass 6
is formed between the guides 7 and 8, and is a path for moving the original separated between the feeding belt 3 and separation belt 5 onto the original platen glass 9. In addition, the second sheet path 10 includes a guide 1
1 and 12, and is a passage for moving the original after image exposure from the platen glass 9 to the feeding tray 1. 1 more
3, 14, and 15 are sheet feeding rollers, and roller 1
The document passing through the sheet path 6 between rollers 14 and 14 is conveyed toward the platen glass 9, and the document passing through the sheet path 10 is conveyed between the rollers 14 and 15 to the feeding tray 1.
send in the direction Further, reference numeral 16 denotes a deflection plate, which is pasted on the guide 12 so that its tip is in contact with the guide 7. The document moving to the path 10 can move smoothly because the tip of the deflecting plate 16 is pushed by the guide 7. Note that this deflection plate 16 may be made of any material as long as it is a flexible sheet-like material such as mylar or thin plate stainless steel. Reference numerals 17 and 17a denote document conveyance rollers, which rotate the document conveyance belt 18 and convey the document. Note that these rollers 17 and 17a move the original onto the platen glass 9.
The original is rotated in the direction of arrow C when being conveyed upward and set, and the direction of rotation is changed to the direction of arrow D when the original is removed from the platen glass 9 after image exposure. The conveyance rollers 17, 17
a uses roller 17 as a driving roller, and roller 17a
By using a driven roller rotated by the belt 18, there is a structural advantage that the drive system can be consolidated, and a functional advantage is that the document is conveyed on the sagging side of the belt 18, which improves the conveyance performance due to the increase in frictional force. You can satisfy the advantages at the same time. Further 19, 20,
Reference numeral 21 denotes a belt pressing roller, which presses the belt 18 against the glass 9 to ensure that the belt 18 conveys the document. Further, 22 and 22a are ejection rollers that kick out the original that has passed through the sheet path 10 onto the feeding tray 1. Further 23, 23a,
24 and 25 are optical sensors, respectively, and 23 and 23
a detects the presence or absence of a document on the feed tray 1, and
Detects the passage of the original within the sheet path 6. Further, the sensor 25 detects passage of the original within the sheet path 10.

Next, a document separating section to which an embodiment of the present invention is applied will be explained using FIGS. 2 and 3.

FIG. 2 is a top view showing the document separating section. Third
The figure is a side view showing the document separating section.

In FIGS. 2 and 3, 26 is a partition plate that separates the original before exposure from the original after exposure. This partition plate 26 has a partition plate arm 27
is supported by a fulcrum 28. Further, 29 is a friction plate, and a gear 31 fixed to the separation roller shaft 30
It is sandwiched between the arm gear 32 engaged with the partition plate arm 27, and as the separation rollers 4, 4a rotate, the partition plate arm 27 moves to the arrow G.
Apply directional load. This facilitates document feeding from the supply tray 1. Further, a roller 33 is attached which receives the load of the partition plate arm 27 via the feeding belt 3. 36 is the partition plate 26
This is a spring that is hung between the upper shaft 34 and the shaft 35 on the partition plate arm 27, and thereby the shafts 34, 3
Since the line connecting 5 crosses the fulcrum 28, the arrow E
The partition plate 26 is moved in the and F directions, respectively.
The outer periphery 37 of the partition plate 26 is shaped like a cam, and when the partition plate 26 and the partition plate arm 27 are reversed in the direction of arrow G, a shaft 38 attached to a position that engages with the cam 37 moves the partition plate 26 in the F direction. It is configured to return to. Reference numeral 39 denotes an optical sensor that detects the rotation of the partition plate arm 27 in the G direction, thereby making it possible to determine that one cycle of document copying has been completed.

Next, the driving section will be explained using FIG. 4.

FIG. 4 is a sectional rear view showing the drive section. In the figure, 41 is a motor, and 42 is a motor pulley. Further, belts 43, 44 for transmitting drive to the feed rollers 13, 14, 15 and the discharge rollers 22, 22a are wrapped around pulleys 45, 46, 47. Furthermore, 48 is a clutch that transmits drive from the motor 41 to the conveyance roller 17, and
Reverse switching is now possible. 49 is a clutch that transmits drive from the pulley 47 to the feed roller 2 and separation roller 4.

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

Next, the operation will be explained.

For multiple originals set on feed tray 1, turn on the copy start button (not shown) on the main unit.
In response to the signal, the feed rollers 2, 2a and separation rollers 3, 3a begin to rotate in opposite directions, and the sheets are separated and fed into the sheet path 6 one by one.

At this time, the feeding speed of the feeding rollers 13 and 14 is configured to be twice the feeding speed of the feeding rollers 2 and 2a, so that the trailing edge of the document fed after separation and the next document are separated. There will always be a gap between it and the tip. At the same time that the sensor 40 provided along the sheet path 6 detects this gap, the feeding rollers 2, 2a and the separation rollers 3, 3a stop rotating. Since the leading edge of the document fed here has already been gripped by the feed rollers 13 and 14, the document is transported by the feed rollers 13 and 14, and the trailing edge of the document is provided on the downstream side of the sheet path 6. After a time elapses from the moment when the sensor 24 detects the document to the document reference position on the platen, the roller 17 stops, and the document is set at a predetermined position on the platen glass 9 and stopped. Then, the exposure operation of the lamp L on the copying machine main body side is started. At this time, the conveyance roller 1
7 and 17a are rotating in the direction of arrow C. Next, when the exposure completion signal is received from the main body, the conveyance roller 17
starts rotating in the direction D, and the belt 18 discharges the original onto the sheet path 10 from above the platen glass 9. The leading edge of the document passing through the sheet path 10 is detected by a sensor 25 provided on the downstream side of the rollers 14 and 15 of the sheet path 10, and at the same time, a signal from the sensor 25 causes the feeding roller to
Then, the separation roller 4 starts rotating, and the next document is fed. At the same time, the conveying roller 17 changes its rotation direction to the C direction. The originals that have passed through the sheet path 10 are kicked out by rollers 22 and 22a and are stacked on the partition plate 26 on the feed tray 1.
At this time, since the feeding tray 1 is sloped so that the document is downwardly directed toward the separating section, the roller 2
After being kicked out by the originals 2 and 22a, the originals are aligned with their leading ends abutting the separation roller 3a.

Reference numeral 50 denotes a static elimination needle, which functions to eliminate static electricity from the originals that have passed through the sheet path 10 so that the originals can be loaded onto the feeding tray 1 smoothly. This operation is repeated thereafter.

Next, a description will be given of the case where the last page of a plurality of original documents is to be fed. A partition plate 26 is present immediately above the last page. When the last page is fed, the partition plate 26 comes into contact with the feeding belt 3, so the frictional force between them causes the partition plate 26 to rotate in the direction of arrow E, and the force of the spring 36 causes the partition plate 26 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 22 in the direction of arrow G by the friction plate 29, when the partition plate 26 is folded, it starts rotating in the G direction. The feeding roller 2 and the separating roller 4 are each provided on the downstream side of the sheet path 6 and stop when the trailing edge of the document is detected by the sensor 40. Therefore, the partition plate arm 27 stops when the last page is fed. After rotation, it will stop at the position indicated by the broken line in the figure. When the last page is fed, that is, the partition arm 27 is detected by the sensor 39, the last page returns to the feed tray 1 after double exposure, and the feed roller 2 and separation roller 3 are moved until one complete cycle is completed. If the partition plate 26 is stopped and starts rotating at the first page of the second cycle, the partition plate 26 will be placed on top of the last page.

Next, the double-sided original copying function will be explained.

Here, the paper path switching member 16' is rotatable about a shaft 113, and is switched from the position shown by the solid line to the position shown by the broken line by another power (for example, a solenoid).

A sheet material 112 is fixed to the paper path side of the switching member 16', and the sheet material 112 is designed to press against the surface of the platen 9 or the belt 18 through its bending elasticity to reliably guide the paper. Switching member 1
6' is switched to the state indicated by the broken line in the figure before the roller 17 starts rotating, that is, immediately after copying is completed.

The state of the switching member 16' indicated by the solid line is as described above.
It is a state diagram which functions only as ADF, DF, and R-ADF.

The original 116 on the platen 9, whose first side has already been copied, is conveyed to the left by the frictional force with the belt 18 as the roller 17 rotates in the direction of arrowhead D.

The document passes under the member 16', displacing the flexible guide 110 and entering the paper path 114. In front of it are rollers 103, 104, 1.
There is a switchback means consisting of 05,106. The normal feed roller 104 and the reverse roller 103 are each rotating in the direction of the arrow shown in the figure. The driven pressing rollers 105 and 106 are supported by a swing plate 107,
It is able to swing around a shaft 108, and by using other power (such as a solenoid), the normal feed roller 104 and roller 105 swing in the direction of the dashed arrow from the illustrated normal feed roller 104 and roller 105 in the pressure contact state to rotate the reverse roller 103 and roller 1.
06 is switched to the pressure contact side by an electric signal or the like.

The belt 18 continues to rotate in the direction of arrow D until the leading edge of the document 116 passes through the normal feed roller 104 and the roller 105 and reaches the sensor 117. When the sensor 117 detects the leading edge of the document, the rotation of the roller 17 is changed in the direction of arrow C in response to the signal, and the next document is ready to be received from the bottom of the document tray 1. The trailing edge of the document 116 enters the path 114 and the sensor 11
When the rear end is detected by 8, the signal causes the rocking plate 107 to rotate to the right (arrow E) (by the action of a solenoid, etc.), thereby rotating the reversing roller 103 and roller 1.
06 comes into pressure contact, and at the same time the conveying force of the normal feed roller 104 is released, the document 116 starts moving backward, is guided in the direction of the path 10 by the guide 110, is conveyed onto the feeding tray, and the document 116 is It is loaded with the second side facing up. Therefore, when the copying of the other originals on the stack is completed and the original 116 is fed next, the second side becomes the copying side as described in connection with FIG. 1.

The reversing path cover 115 is provided with a rib portion 115a as a guide suitable for a paper guide, and is also provided with an opening portion 115b for a long document. The top surface of the cover 115 is nearly horizontal;
It can also be used for other purposes such as a document placement table.

Furthermore, the aforementioned switchback means 104, 10
3, 105, and 106 function sufficiently as shown in the figure, but from the standpoint of paper conveyance, they should be turned upside down, that is, with the forward and reverse rollers 104, 103 on top, and the swinging rollers 105, 1
Experiments have confirmed that it is better to lower the 06 level.

Note that the feeding tray 1 can be rotated around the rollers 2 and stored in the state 1' indicated by the broken line in the figure.
The roller 2a rotating via the belt 3 also rotates at the same time.
It becomes state a′. In this stored state, it does not function as a BR-ADF, R-ADF, or ADF that handles multiple original sheets, but can function only as a manual feeder for a single original sheet, that is, as a DF.

Furthermore, the pressing roller 19 is normally pushed toward the belt 18 by a spring 122 via an arm 119 around a central shaft 120, but when the document is replaced, it is pushed away from the belt 18 side by the action of a solenoid 121. . This is because when exchanging originals in the B-R-ADF and R-ADF modes, the original fed onto the platen 9 and the original ejected from the platen 9 to the left may temporarily come into contact with each other and pass each other. Therefore, it was devised to avoid hindering its transportability.

As described above, the present invention provides an extremely versatile double-sided document automatic circulation conveyance device that is small, lightweight, inexpensive, and highly reliable.The device according to the present invention can be applied to all general copying machines. Not only is this possible, but it is even more effective if used in combination with a double-sided copying device.

Furthermore, when copying is performed using the R-ADF according to the present invention, a set of well-ordered copies of the original can be obtained each time, so it can be used in conjunction with a copying machine with an oscillating output tray of known technology. If used, a large sorter or the like for collation becomes unnecessary, and from this point of view it can be seen that it is particularly suitable for general-purpose and small-sized copying machines.

As described above, the sheet document conveying method and device according to the present invention reverses the front and back sides of the separated and fed sheet document and guides it to a predetermined position, and after ejecting the sheet document from the predetermined position, The sheet document is reversed twice through different passes to turn the sheet document upside down, and then guided again to a predetermined position from the side from which it was ejected. As a result, there is no need to bend the sheet document extremely in order to turn the front and back sides, so there is an effect that no strain is applied to the sheet document. 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.

In addition, with a configuration in which the front and back sides of the sheet original are rotated and guided to a predetermined position below, the sheet original can be fed to the predetermined position from above, thereby making it possible to downsize the apparatus.

Further, by feeding the next sheet document while the previous sheet document is being conveyed, there is an effect that the interval at which sheet documents are sent out can be shortened.

Further, in the case where a roller that rotates in the direction of conveying the sheet original is provided in each reversing path, the apparatus can be made smaller and simpler by using the roller also.

In addition, by providing an opening in a part of the sheet reversing path to expose a part of the sheet original,
It is effective to be able to visually see which pages are being processed.

Further, by providing the sheet document loading means above a predetermined position and guiding the sheet to the predetermined position along a curved sheet path, it is possible to further reduce the size of the apparatus.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a top view of the separating part showing details of the separating part, FIG. 3 is a detailed side view of the separating part, and FIG. 4 is a sectional rear view showing the driving part. In the figure, 1 is a feeding tray, 2 is a feeding roller, 4 is a separation roller, 9 is a platen glass, 1
7 is a conveyance roller, and 18 is a conveyance belt.

Claims (1)

[Scope of Claims] 1. A sheet that separates and feeds sheet originals one by one and guides them to a predetermined position 9, then discharges the sheet originals from the predetermined position 9, turns the sheet originals upside down, and guides them to the predetermined position again. In the original transport method, the sheet original that has been separated and fed is moved downward while being bent so that the front and back sides are reversed and guided to a predetermined position. After the sheet original is ejected from the predetermined position, A sheet original conveying method characterized in that the sheet original is reversed twice through different paths 114, 10, 3, and 6 to turn the sheet original upside down, and then guided again to a predetermined position from the ejected side. 2. Feeding means 3 and 5 for separating and feeding the sheet originals one by one, and a curved sheet path 6 for reversing the separated and feeding sheet originals and guiding them to a predetermined position 9 below.
and a sheet reversing path 114 that reverses the conveying direction of the sheet original ejected from the predetermined position 9 twice to turn the sheet original upside down, and guides the sheet original from the ejected side to the predetermined position again. 10,
3, 6, and a sheet document conveying device characterized by comprising the following. 3. The sheet reversing paths 114, 10, 3, and 6 are branched from the first path 114 that guides the sheet original in one direction, and the sheet reversing paths 114, 10, 3, and 6 are branched from the first path 114 and the sheet original is conveyed in the opposite direction through the first path 114. a second path 10 for guiding the sheet document, and a second path 10 for guiding the sheet original in the first path 114;
is provided on the downstream side of the branching point 110 with the path 10, and conveys the sheet original in one direction until the trailing edge of the sheet original passes the branching point 110,
Reversible conveyance rotation means 104, 105, 103, 10 that switches to convey the sheet document in the opposite direction when the rear end of the sheet document passes the branch point 110.
6. A sheet document conveying device according to claim 2, comprising: 6. 4 Reversible conveyance rotation means 104, 105, 103,
A detection means 118 for detecting the trailing edge of the sheet document is provided between 106 and the branch point 110, and the detection means detects the reversible conveyance rotation means 104, 105, 1.
The sheet document conveying device according to claim 3, which controls switching between 03 and 106. 5 Reversible conveyance rotation means 104, 105, 103,
106 is a normal rotation roller 10 that rotates in one direction.
4, 105, and a reversing roller 1 rotating in the opposite direction.
03, 106, and means 107 for switching the normal rotation rollers 104, 105 and the reverse rotation rollers 103, 106 so as to alternately act on the sheet document. 6. Claim 3, comprising a flexible guide 110 arranged to guide the sheet to the second path 10 at the branching point 110 and displaced by the original sheet conveyed in one direction along the first path 114. The sheet document conveying device according to any one of items 1 to 5. 7 feeding means 3 for feeding sheet originals one by one;
5, 13, and 14, a sheet path 6 for reversing the front and back sides of the fed sheet original and guiding it to a predetermined position 9, and reversing the conveyance direction of the sheet original ejected from the predetermined position 9 twice. A sheet reversing path 114, 10, which reverses the front and back of the sheet original and guides the sheet original from the ejected side to a predetermined position again.
3, 6; conveying means 104, 105 provided in the sheet reversing paths 114, 10, 3, 6 and further conveying the sheet original discharged from the predetermined position 9; and the sheets conveyed by the conveying means 104, 105. A sheet document conveying device comprising control means 117 and 49 for controlling the supply means 3, 5, 13, and 14 so that the next sheet document is fed while the document is being conveyed. 8. A conveying body 18 is provided in the sheet path 6 and rotates in one direction C to guide the sheet original to a predetermined position and then stops. 8. The sheet document conveying device according to claim 7, wherein the sheet document conveying device rotates in one direction C. 9 supply means 3 and 5 for separating and feeding sheet originals one by one; a sheet path 6 for reversing the front and back of the separated and fed sheet originals and guiding them to a predetermined position 9; and a sheet ejected from the above-mentioned predetermined position 9. A sheet reversing path 114, 10, which reverses the document conveying direction back and forth twice to reverse the front and back of the sheet document, and guides the sheet document back to a predetermined position from the side from which it was ejected.
3, 6, a first sheet conveyance roller 13 that is located within the sheet path 6 and rotates; and a first sheet conveyance roller 13 that is located within the sheet reversal path 114, 10, 3, 6 and rotates in the same direction as the first sheet conveyance roller 13. a second sheet conveying roller 15 that rotates in a direction opposite to that of the first and second sheet conveying rollers, and a second sheet conveying roller 15 that rotates in a direction opposite to that of the first and second sheet conveying rollers; A sheet document conveying device comprising: a rotating third sheet conveying roller 14; 10. The sheet document conveyance device according to claim 9, wherein the third sheet conveyance roller 14 is a driving roller, and the first and second sheet conveyance rollers 13 and 15 are driven rollers. 11 feeding means 3 and 5 for separating and feeding sheet originals one by one; a sheet path 6 for guiding the separated and fed sheet originals to a predetermined position 9; A sheet reversing path 114, 10, which reverses the front and back of the sheet original twice by reversing it back and forth, and guides the sheet original again to a predetermined position from the side from which it was ejected.
3, 6, and an opening 115 provided in a portion 114 of the sheet reversing path, through which a portion of the sheet original is exposed.
A sheet document conveying device comprising: b. 12 A stacking means 1 for stacking sheet originals; supply means 3 and 5 for separating and feeding sheet originals one by one from the above-mentioned stacking means 1; A curved sheet path 6 that leads to a predetermined position 9, and a back and forth reversal of the conveyance direction of the sheet original ejected from the above-mentioned predetermined position 9 are performed twice to reverse the front and back of the sheet original, and the side from which the sheet original is ejected is sheet reversing path 114, 10,
3, 6, and a sheet document conveying device characterized by comprising the following. 13 Supply means 3 and 5 for separating and feeding the sheet originals one by one; a sheet path 6 for guiding the separated and fed sheet originals to a predetermined position 9; and a sheet path 6 for guiding the separated and fed sheet originals to a predetermined position 9; a means 16' for guiding the sheet original through the lower part of the sheet path 6; and a means 16' for guiding the sheet original through the lower part of the sheet path 6; A sheet document conveying device comprising: sheet reversing paths 114, 10, 3, and 6 for reversing the front and back sides of the sheet document and guiding the sheet document from the ejected side to a predetermined position again.