JP3446736B2 - Image reading device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique of an image reading apparatus capable of automatically feeding documents one by one and reading both sides.

[0002]

2. Description of the Related Art In a conventional image reading apparatus, when reading both sides of a document, first, the document is fed to a reading unit to read the front side, and is conveyed to a space on a discharge tray by a discharge roller, and then the document is read. It is configured such that the rotation direction of the discharge roller holding the trailing end is reversed, the document is reversed through the document return path and fed again to the reading unit, then the back side is read and discharged to the discharge tray. However,
Since the original after being read by the image reading device is discharged to the discharge tray with the front side facing up, if a plurality of originals are sequentially read as they are, for example, the first original, which is the first page, will be printed. The discharged original is not in the page order such that the back side of the second original, which is the fourth page, comes on the front side. So, as a technique that improved this point,
The original document which has been read on both sides and is conveyed to the discharge portion is switched back, and is conveyed again to the reading portion through the original document return path, and the reading portion does not perform the reading and passes the document as it is and discharges it. This makes it possible to reverse the front and back sides of a document that has been scanned on both sides and eject it with the front side of the document facing down, so that the next document can be stacked in order with the page order aligned. Become.

[0003]

However, in the above-mentioned prior art, when the originals are sequentially stacked, the originals whose both sides have been read are placed so that the originals can be stacked face down so that the page order is aligned. Since the document is switched back and conveyed again to the reading unit, the document passes through the document reading unit three times, which requires a lot of time to read both sides of the document. In addition, in the third passage, the original is not read, but is passed through the original reading unit, so that the next original cannot be fed during that time.
This has been a hindrance to improving the document reading speed.

In view of the above points, it is an object of the present invention to provide an image reading apparatus that shortens the time required to read both sides of a document and that aligns the page order of discharged documents. .

[0005]

The present invention uses the following means in order to solve the above problems.
In claim 1, a reversing unit for reversing the front and back of the paper supplied from the paper supply unit before the reading, and a conveying unit for reversing the conveyance direction and conveying the reversed paper to the reading unit.
A guide unit for guiding the sheet to the reading unit and a reversing unit for reversing the conveying direction of the sheet read by the reading unit and conveying the sheet again to the reading unit are provided so that both front and back sides of the sheet can be read. An image reading device, which accumulates on the document supply tray 9
Ejection port just below the paper feed port 8a for feeding the printed sheet originals
8b is provided, and the paper feed port 8a and the paper discharge port 8b are vertically intermediate.
Set the position to scan the paper supplied from the paper supply unit before scanning.
It is equipped with a temporary outlet 8c that reverses the
At the paper exit 8b through which the document after being fed is ejected,
Reverses the conveying direction of the paper that has been read by the reading unit,
It is designed to perform a switchback reversal of transporting again to the reading unit.
It was made.

According to claim 2, the image according to claim 1
In the reading device, the temporary discharge port 8c and the discharge port 8b
An extra roller 26 is provided between them, and the first and
The press roller 27 and the second press roller 29 are arranged to
Kitstra roller 26 and first press roller 27 are front and back
Conveying the reversed sheet original by reversing the conveying direction
The feeding means, the extra roller 26 and the second press row
La 29 and the platen glass 12 were read and processed.
The platen glass 1
2 is a reversing means for carrying the sheet up .

[0007]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a facsimile adopting an image reading apparatus, FIG. 2 is a side sectional view of the same, and FIG. 3 is an automatic document feeder (hereinafter, “ADF”) according to a first embodiment of the present invention.
4 is a side sectional view of FIG. 4, FIG. 4 is a block diagram showing the control configuration of the image reading apparatus according to the present invention, FIG. 5 is a flow chart showing the outline of the control configuration of the image reading apparatus according to the first embodiment of the present invention, and FIG. FIG. 7 is a flowchart showing an initial stage of the control configuration of the image reading apparatus according to the first embodiment of the present invention, FIG. 7 is a flowchart showing a second stage, FIG. 8 is a flowchart showing a third stage, and FIG. 10 is a flow chart showing the latter half of the loop portion, FIG. 11 is a flow chart showing the final stage of the same, FIG. 12 is a side sectional view of an ADF according to the second embodiment of the present invention, and FIG. 13 is a flow chart of the present invention. FIG. 14 is a flowchart showing the outline of the control configuration of the image reading apparatus in the second embodiment, and FIG.
16 is a flowchart showing an initial stage of the control configuration of the image reading apparatus according to the embodiment, FIG. 15 is a flowchart showing a second stage of the same, and FIG.
Is a flow chart showing the third stage, FIG. 17 is a flow chart showing the fourth stage, and FIG. 18 is a flow chart showing the final stage.

An image reading apparatus according to the present invention will be described by taking a facsimile apparatus as an example, and first, its entire configuration will be described. The facsimile apparatus shown in FIGS. 1 and 2 is configured by disposing a reading unit 1 above a recording unit 2. In the recording unit 2, a recording device 3 and a paper feed cassette 4 are vertically installed, respectively, and the sheets accumulated in the paper feed cassette 4 are fed to the recording device 3 and recorded, and then the recording paper is ejected. It is configured to be discharged to the tray 5.

The reading unit 1 has a hinge 10b extending from the bottom surface of a reading case 10 which is a partial structure of the reading unit 1, which is pivotally supported on a hinge pin 1a provided in the recording unit 2, thereby With respect to the recording unit 2, the hinge pin 1a is rotatable up and down.

In the reading unit 1, a reading device 6 is housed in a reading case 10. On the upper surface of the reading case 10, a transparent stationary document placing bed 11 is arranged,
The reading device 6 scans an original document placed on the stationary original document bed 11 while moving from the solid line position to the virtual line position in FIG.

A document holding cover 7 is arranged above the reading case 10 so that it can be opened and closed about one side thereof. The document holding cover 7 is used to cover the document placed on the stationary document placing bed 11. It is supposed to be pressed from above.

An ADF 8 is provided at one end of the document pressing cover 7.
Is attached. As shown in FIG. 1, the exterior portion of the ADF 8 is arranged in parallel in a direction orthogonal to the scanning direction of the reading device 6,
A document pressing cover 7 and side frames 7a and 7b are provided upright, and an ADF 8 is provided between both side frames 7a and 7b.
The ADF cover 14 that covers the entire document transport section is opened and closed. Side plates made of sheet metal (not shown) are vertically fixed to the inner opening surfaces of the side frames 7a and 7b along the end portions on the ADF cover 14 side. Each roller end of the roller shaft is supported. Document holding cover 7 and side frames 7a and 7b
One or both of the two cover the drive source of the drive roller and its transmission system, and the inner surface thereof is covered by the side plate.

The document pressing cover 7 and the side frames 7a and 7b form a main body of the ADF 8, and a document conveying section which is sandwiched by the main body of the ADF 8 and is covered by the ADF cover 14 is provided. Make up the whole.

A document feeding tray 9 is arranged above the document pressing cover 7 so as to be continuous with the sheet feeding port 8a of the ADF 8, and the ADF 8 is fed onto the document feeding tray 9 below the document feeding tray 9. The document discharge tray 7c is integrally formed so as to be continuous with the paper discharge port 8b arranged immediately below the port 8a. In the ADF 8, there are a paper feed port 8a and a paper ejection port 8b.
Up to the document transport path is configured.

The sheet originals accumulated on the original supply tray 9 are picked up one by one and fed to the paper feed port 8a. The original document fed by the ADF 8 and passing over the platen glass 12 is read by the reading device 6 at the initial position shown by the solid line in FIG. The read document is discharged from the discharge port 8b onto the document discharge tray 7c.

As described above, the reading unit 1 is used as a flat bed type scanner which scans the reading device 6 to read a static original, and the reading device 6 is fixed in position to feed the original to the ADF 8 for reading. It is configured so that it can be used as a sheet feed type scanner.

A key panel 13 is attached to one side of the reading case 10. By pressing various operation keys of the key panel 13, the contents of the document are read, the destination of the read contents is transmitted by facsimile, and the received contents and the read contents are recorded by the recording device 3. And various operations are performed.

Next, the internal structure of the ADF 8 of the automatic sheet conveying apparatus according to the first embodiment of the present invention will be described. In this description, in the side view shown in FIG. 3, the document transport direction is the front-rear direction (the document transport path is the front on the side of the paper feed port 8a and the paper discharge port 8b, and the rear on the side of the curved portion (transporting direction folding portion)). The horizontal direction is the right-left direction. Further, unless otherwise specified, as shown in FIG. 2, the ADF cover 14 is closed, and the document holding cover 7 is placed on the upper surface of the reading case 10 with no document on the document placing bed 11. The vertical and front-back positions of each structure will be described on the assumption that the structure is placed in a normal state.

First, the flow of the document transport path will be outlined. As shown in FIG. 3, the ADF 8 has a paper feed port 8a through a paper ejection port 8a.
Up to b, a first document feeding path R1 having a "c" shape in a side view and a second document feeding path R2 having a substantially "ε" shape in a side view are formed, and the paper feeding port 8a and the paper ejection port 8b are connected to each other. A temporary discharge port 8c is provided at an upper and lower intermediate position. An extra roller 26 is arranged between the temporary discharge port 8c and the paper discharge port 8b, and a first press roller 27 and a second press roller 29 are arranged above and below the extra roller 26. Further, a nip portion between the separate roller 22 and the retard roller 23 is provided near the sheet feeding port 8a, and the arms 20, 20 are swingably provided toward the front from both ends of the separate roller 22. The arm 20.2.
The pickup roller 21 is pivotally supported at the front end portion of 0. Then, the slave feed roller 2 is moved along the “ε” -shaped second document transport path R2 from the paper feed port 8a to the paper discharge port 8b.
4, a nip portion between the master feed roller 25, the extra roller 26 and the first press roller 27, a nip portion between the giant feed roller 28 and the first slave roller 31, the giant feed roller 28 and the second slave The nip portion with the roller 32, the giant feed roller 28 and the third slave roller 33
And a nip portion between the extra roller 26 and the second press roller 29 are arranged in this order.

The pickup roller 21, the separate roller 22, the retard roller 23, etc. separate the sheet originals accumulated on the original supply tray 9 one by one, and feed them from the paper feed port 8a to the original conveying path. I am trying. The second press roller 29 is vertically movable by a cam mechanism (not shown) or the like, and is controlled so that the contact between the extra roller 26 and the second press roller 29 can be released.

Here, the upper half of the second original feeding path R2 is a reversing means for reversing the sheet original fed from the paper feed port 8a before the reading, and includes the extra roller 26 and the first press roller. 27 is a conveying means for reversing the conveying direction of the sheet original whose front and back are reversed and conveying the sheet original onto the platen glass 12, and the giant feed roller 28 and the slave rollers 31, 32 and 33 convey the sheet original to the platen glass 12. As a guide unit for guiding upward, the extra roller 26 and the second press roller 29 reverse the conveying direction of the sheet original read on the platen glass 12, and reversely convey the sheet original to the platen glass 12 again. Is.

Of the above-mentioned rollers, the roller shafts 25a, 26a, 28 of the master feed roller 25, the extra roller 26, and the giant feed roller 28, respectively.
In a, both shaft ends are axially supported by the side plates of the ADF8 apparatus main body, and are fixed in position.
25, 26, 28 are adapted to be driven by a drive source and a transmission mechanism arranged inside either or both of the side frames 7a, 7b. That is, the rollers 22, 23, 25, 26, 28 are drive rollers,
Each roller 24.27.29.31.
Numerals 32 and 33 are driven rollers that rotate with each driving roller.

A first guide member 37 is disposed at a position slightly behind the nip portion between the slave feed roller 24 and the master feed roller 25, and at a branch position between the first document feeding path R1 and the second document feeding path R2. The first guide member 37 rotates in the up-down direction about the rotation fulcrum shaft 37a, and allows the document conveyance path to be selected. That is, when the reading surface of the original is selected by the screen operation of the function keys 18 provided on the key panel 13 and the single-sided reading mode is set, the first guide member 37 is rotated to the lower position A and the original is moved. Is conveyed to the first original conveying path R1 and when the double-sided reading mode is set, the first guide member is rotated to the upper position B and the original is conveyed to the second original conveying path R2. There is.

The roller shaft 27 of the first press roller 27
A second guide member 38 is disposed at a, and the guide member 38 is rotated to a lower position (document passing blocking position) C or an upper position (document passing position) D to control document passing / blocking. It is possible. At the intermediate position between the extra roller 26 and the giant feed roller 28 in the front-rear direction, the upper and lower second document transport paths R2 running in the front-rear direction.
Are connected by a third document feeding path R3, and a third guide member 39 is arranged below the third document feeding path R3. The third guide member 39 rotates up and down about a rotation fulcrum shaft 39a to control the passage direction of the document. That is, the third
When the guide member 39 is rotated to the lower position E,
When the lowermost second document transport path R2 running in the front-rear direction is blocked, the document flows through the third document transport path R3, while the third guide member 39 is rotated to the upper position F. ,
The third document transport path is blocked, and the document passes through the second document transport path R2 at the lowermost position. The third guide member 39 may be a flexible member such as a film, or may be arranged so as to open and close the transport path by its own weight.

Further, the first position detection is performed at an appropriate position on the second document feeding path R2 between the nip portion between the slave feed roller 24 and the master feed roller 25 and the nip portion between the extra roller 26 and the first press roller 27. A sensor 35 is provided, and a second position detection sensor 36 is provided near the confluence of the first document transport path R1 and the second document transport path R2 to detect the passage of each document. The rotation shaft 26a of the extra roller 26 and the rotation shaft 28a of the giant feed roller 28 have a first angle sensor 46 and a second angle sensor 48, respectively, which detect the rotation angle of each roller.

Next, the controller 40 of the image reading apparatus according to the first embodiment of the present invention, which is equipped with a document front / back reversing mechanism.
Will be described. The document conveyance pattern is controlled by the controller 40 shown in FIG. 4, and the controller 40 is connected to the following sensors and control members. Reference numerals 35 and 36 each include an optical sensor or a limit switch in which a light emitting element is arranged on one side of the conveyance path and a light receiving element is arranged on the other side. When the passage start and the passage completion are detected, a control signal (detection signal) is transmitted to the controller 40. Reference numerals 46 and 48 are the above-mentioned angle sensors including a potentiometer and the like, which detect the rotation angle of each roller, and when the rollers reach a predetermined rotation angle,
A control signal (detection signal) is transmitted to the controller. Three
Reference numerals 7, 38, 39 denote the above-mentioned guide members for restricting the document conveyance direction, which receives a control signal (switching signal) from the controller 40 to move the leading end of the guide member to an upper position or a lower position. Rotate to switch the document transport path. In addition, each roller 22, 23, 25, 26, 28
The drive source 41 and its transmission mechanism 42 drive and stop the respective rollers based on the control signal (drive signal) from the controller 40.
In 6, the forward and reverse rotations are controlled. Lifting mechanism 4 for the second press roller 29, which is composed of a cam mechanism or the like.
3 is a control signal (driving signal) from the controller 40
It is possible to move up and down based on. And FIG.
On the key panel 13 shown in, the function keys 18 for setting the reading mode such as conversion of single-sided / double-sided reading,
A start button 19 for starting a sheet document reading operation, and a stop button 1 for stopping the reading operation during reading of a plurality of sheet documents continuously.
6 and the like are arranged, and when the function key 18, the start button 19, the stop button 16 or the like is operated, a control signal is output to the controller 40.

The control configuration of the document front / back reversing mechanism according to the first embodiment of the present invention is schematically shown in FIG. 5, and its details will be described below. As shown in FIG.
First, the user sets the sheet original with the front side facing up on the original feeding tray 9, and operates the function key 18 of the key panel 13 to select the original reading surface mode to the double-sided reading mode (step S1). . Here, a control signal (switching signal) is input from the controller 40 to each guide member 37, 38, 39, and each guide member 37, 38, 39
All of 39 are switched to the upper positions B, D, F (step S).
2).

When the user presses the start button 19 arranged on the key panel 13 (step S3),
A control signal is input from the controller 40 to the extra roller 30, the drive source 41 of each of the rollers 22, 25, 26, 28 and the transmission mechanism 42 thereof. As a result, the extra roller 26 starts rotating in the forward direction (clockwise direction in FIG. 3) (step S4), and the pickup roller 21, the separate roller 22, and the retard roller 2 are rotated.
3rd etc. top sheet original (first sheet original)
Only the separated sheets are separated and fed from the paper feed port 8a to the document feeding path, and then are inherited by the master feed roller 25 and the slave feed roller 24 and fed to the second document feeding path R2 (step S5).

Then, the first sheet document is temporarily sent by the extra roller 26 and the first press roller 27 from the temporary discharge port 8c to the space on the discharge tray 7c, and then the first position detection sensor 35 is used. When the passage of the trailing edge of the first sheet document is detected (step S6),
A control signal notifying the detection is output to the controller 40, and the controller 40 outputs a control signal (switching signal) to the second guide member 38 and further outputs a control signal (reverse rotation command signal) to the extra roller 26.

In this way, in the controller 40, when the first position detection sensor 35 detects the passage of the trailing end of the first sheet document, the trailing end of the sheet document is moved from the position of the first position detection sensor 35 to the first position detection sensor 35. 2 The rotation angle of the extra roller 26 (first rotation) so that the sheet document is further fed by the distance conveyed to the position between the guide member 38 and the position of the nip portion between the extra roller 26 and the first press roller 27. Angle) is controlled. That is, as shown in FIG. 7, after the first rotation angle is detected by the first angle sensor 46 (step S7), most of the first sheet document is discharged from the temporary discharge port 8c, Only the end portion has the extra roller 26 and the first press roller 27.
The second guide member 3 prevents the sheet document from being fed backward in the direction of the paper feed port 8a at this moment while being nipped by
8 is switched to the lower position C (step S8), and the extra roller 26 is rotated in the reverse direction (counterclockwise direction in FIG. 3) (step S9), and the first sheet document is transferred to the extra roller 26 and (1) The press roller 27 is returned in the opposite direction.

The switchback-reversed first sheet original is drawn by the giant feed roller 28 and the first slave roller 31, and the leading end (the end before the switchback inversion) of the first sheet original is the second. When detected by the position detection sensor 36 (step S10), a control signal notifying the detection is output to the controller 40,
A control signal (read command signal) is output from the controller 40 to the reading device 6.

Thus, in the controller 40, when the second position detecting sensor 36 detects the passage of the leading edge of the first sheet document, the second angle sensor 48 causes the leading edge of the sheet document to reach the second position. The rotation angle (second rotation angle) of the giant feed roller 28 corresponding to the distance conveyed from the position of the detection sensor 36 to the rear end position of the platen glass 12 is measured, and after reaching the second rotation angle (step S11). ), First, reading of the back surface of the first sheet original is started (step S12).

As shown in FIG. 8, the first sheet original is conveyed by the giant feed roller 28 and the second slave roller 32 or the third slave roller 33, and the second position detection sensor 36 detects it. When it is detected that the trailing edge of the first sheet document has finished passing (step S13), the detection signal is sent to the controller 4
Output to 0. Then, a control signal (reading end command signal) is output from the controller 40 to the reading device 6,
After that, control signals are respectively output to the extra roller 26, the second guide member 38, the third guide member 39, and the transmission mechanism 42 of the drive source 41.

In this way, in the controller 40, when the second position detection sensor 36 detects the passage of the trailing end of the first sheet document, the angle sensor 48 detects the trailing end of the sheet document as the second position detection sensor. Rotation angle of giant feed roller 28 corresponding to the distance conveyed from position 36 to the front end position of platen glass 12 (third rotation angle: (third rotation angle)> (second rotation angle))
And the end of the sheet document moves from the position of the second position detection sensor 36 to the third guide member 39 and the extra roller 26.
Between the second press roller 29 and the position of the nip portion of the second press roller 29.
8 rotation angle (fourth rotation angle) is measured,
After the rotation angle is reached (step S14), the reading of the back surface of the first sheet original is completed (step S1).
5).

Further, after the fourth rotation angle is detected by the angle sensor 48 (step S16), most of the first sheet document is discharged from the sheet discharge port 8b, and only the end portion thereof is the extra roller. 26 and the second press roller 2
With the nip between 9 and 9, the extra roller 26
Rotation of the second guide member 3 is stopped (step S17).
8 is switched to the upper position D (step S18), and further, the third guide member 39 is switched to the lower position E so that the sheet document is not fed backward in the direction of the third slave roller 33 (step S19).

At this point, the pickup roller 21, the separate roller 22, the retard roller 23 and the like separate only the next uppermost layer sheet document (the second sheet document) from the paper feed port 8a to the document transport path. The extra roller 26 is taken in (step S20), and starts to rotate in the forward rotation direction (clockwise direction in FIG. 3) (step S21). The conveyance of the second sheet original is carried by the master feed roller 25 and the slave feed roller 24, and is fed to the second original conveyance path R2, where the leading edge of the second sheet original is the first. It is detected by the 1-position detection sensor 35 (step S22), is further conveyed by the extra roller 26 and the first press roller 27, and is temporarily discharged from the temporary discharge port 8c.
sent to the space above c.

When the extra roller 26 starts to rotate in the normal direction in step S21, the first sheet original is also switched back and conveyed, passes through the third original conveying path R3, and then the giant feed roller 28 and the second sheet conveying path R3. 1 Slave roller 31 is inherited. Then, the front end of the first sheet original (the end before the second switchback inversion, that is, the front end when set in the paper feed port 8a becomes the traveling direction side again) is set to the second position detection sensor 36. When it is detected (step S23), the detection signal is output to the controller 40, and the controller 40 outputs a control signal (down command signal) to the elevating mechanism 43 of the second press roller 29 and also to the reading device 6. A control signal (reading command signal) is output, and immediately after that, the third guide member 3
A control signal (switching signal) is output to 9.

Thus, the second press roller 29 is lowered, and the extra roller 26 and the second press roller 29 are moved.
And are separated from each other (step S24). As a result, between the rollers 26 and 29, the leading edge and the trailing edge of the sheet document whose conveying directions are opposite to each other are smoothly rubbed with each other without being interfered by the rollers 26 and 29.

In the controller 40, the angle sensor 48 starts measuring the rotation angle of the giant feed roller 28 when the second position detecting sensor 36 detects the leading edge of the first sheet document, and After reaching the rotation angle of 2 (step S25), reading of the front surface of the first sheet original is started (step S26). Immediately thereafter, a control signal (switching signal) is output from the controller 40 to the third guide member 39,
The guide member 39 is switched to the upper position F (step S27).

After that, the first sheet document is a giant feed roller 28, a second slave roller 32,
Alternatively, when the sheet is conveyed by the third slave roller 33 and the second position detection sensor 36 detects that the trailing edge of the first sheet document has finished passing (step S2).
8) From this time, the controller 40 starts measuring the rotation angle of the giant feed roller 28 by the angle sensor 48, and after reaching the third rotation angle (step S29), sends a control signal (reading signal) to the reading device 6. An end command signal) is output, and the reading of the front surface of the first sheet original is completed (step S30).

While the reading process of the first sheet document is being performed, the second sheet document is still conveyed through the second document conveying path R2 toward the temporary discharge port 8c. As shown in FIG. 10, the first position detection sensor 3
When the passage of the trailing end of the second sheet document is detected by 5 (step S31), a control signal notifying the detection is output to the controller 40. Then, from the controller 40, the second guide member 38, the extra roller 2
6, and a control signal is output to the lifting mechanism 43 of the second press roller 29 .

In the controller 40, measurement of the rotation angle of the extra roller 26 by the first angle sensor 46 is started when the first position sensor 35 detects the passage of the trailing edge of the first sheet document. When the rotation angle reaches the first rotation angle (step S32),
Most of the second sheet document is discharged from the temporary discharge port 8c, and only the end portion thereof is nipped by the extra roller 26 and the first press roller 27, and at this moment, toward the paper feed port 8a. The second guide member 38 is switched to the lower position C so that the sheet document is not fed backward (step S33). At the same time, the extra roller 26 is rotated in the reverse direction (counterclockwise direction in FIG. 3) (step S34), and the second sheet original is fed in the opposite direction by the extra roller 26 and the first press roller 27. Then, the second press roller 32 is raised and brought into contact with the extra roller 26 at this time (step S3).
5).

Thereafter, the reading process of the second sheet original document is returned to the step S10, and the reading process is performed following the same flow as that of the first sheet original document. On the other hand, the first sheet original is fed by the extra roller 26 and the second press roller 29 by the reverse rotation of the extra roller 26 in step S34.
It is discharged to the discharge tray 7c. In this way, as soon as the reading of the front side of the preceding sheet original is finished, the reading of the back side of the next sheet original is started, and the reading of the sheet original is successively performed. However,
When the last one sheet document is conveyed, the flow is as follows.

That is, when the last sheet original has passed through step S22 shown in FIG. 8, the first position detecting sensor 35 does not operate naturally because there is no next sheet original, so that the surface of the last sheet original is read. It is a control that only goes and ends. The first sheet original may be the last one sheet original, and in this case, step S1
From step S22 to step S22, the following flow is executed as it is.

The flow of the final sheet document will be described below. After the predetermined time elapses, the controller 40 measures the fourth rotation angle of the giant feed roller 28 by the angle sensor 48 in step S16 shown in FIG. If the passage of the original document is not detected by the first position detection sensor 35 (step S22), as shown in FIG.
The last sheet original switched back in step S21 is conveyed by the giant feed roller 28 and the first slave roller 31 via the third original conveying path R3, and the leading end of the last sheet original is moved to the second position. When the detection sensor 36 detects (step S36), the detection signal is output to the controller 40. Then, from the controller 40, the lifting mechanism 4 for the second press roller 29
A control signal (down command signal) is output to 3 and
A control signal (reading command signal) is output to the reading device 6, and immediately after that, a control signal (switching signal) is output to the third guide member 39.

Thus, the second press roller 29 is lowered, and the extra roller 26 and the second press roller 29 are moved.
And are separated from each other (step S37). In the controller 40, the angle sensor 48 starts measuring the rotation angle of the giant feed roller 28 from the time when the second position detection sensor 36 detects the leading edge of the last sheet document, and the second rotation angle is set to the second rotation angle. After reaching (step S38), reading of the front surface of the last sheet document is started (step S39). Immediately thereafter, the controller 40 sends a control signal (switching signal) to the third guide member 39.
Is output and the third guide member 39 is switched to the upper position F (step S40).

Thereafter, the last sheet document is conveyed by the giant feed roller 28 and the second slave roller 32 or the third slave roller 33, and the second sheet document is transferred to the second sheet roller 32.
When the position detection sensor 36 detects that the end of the last sheet document has finished passing (step S41),
The detection signal is output to the controller 40. From the controller 40, the extra roller 26,
After the control signal (raising command signal) is output to the elevating mechanism 43 of the second press roller 29, the control signal (reading end command signal) is output to the reading device 6.

In this way, the extra roller 26 is rotated in the reverse direction (counterclockwise direction in FIG. 3) (step S42), the second press roller 29 is raised, and the extra roller 26 and the second press roller 29 are moved. After returning to the contact state (step S43), the controller 40 detects the passage of the trailing end of the first sheet document by the second position detection sensor 36, and then detects the passage of the giant feed roller 28 by the angle sensor 48. The measurement of the rotation angle is started, and after the third rotation angle is reached (step S44), the reading of the surface of the last sheet original is completed (step S45).

Then, the last sheet document is fed by the extra roller 26 and the second press roller 29 and discharged to the discharge tray 7c. Finally, in the controller 40, for example, after the fourth rotation angle of the giant feed roller 28 is measured by the angle sensor 48 and then the predetermined rotation angle is further measured, after a predetermined time elapses, all rollers are moved. Stop (step S46).

With such a configuration, the original surface of the sheet original is reversed before being read at the initial stage of conveyance, and then the original is sent to the reading unit 2, so that the platen glass 12 only needs to be passed twice. The reading time of can be shortened.
Moreover, in such a configuration, the sheet original placed on the paper feed tray 9 with the front side facing upward is first read from the back side, inverted to read the front side, and then discharged with the front side facing down. Then, the next original is sequentially ejected onto it, and the page order is aligned.

In particular, the original supplied from the original supply tray 9 is turned upside down while being conveyed through the second original conveying path R2, and its conveying direction is reversed by the extra roller 26 and the second press roller 29. After that, it is conveyed toward the platen glass 12 side which is the reading unit, and further, the giant feed roller 28 and the slave rollers 31, 32.
Since the sheet document is nipped by 33 and conveyed to the platen glass 12 while being reliably guided, the sheet document does not enter the platen glass 12 from obliquely above, and reading defects due to skew of the document, document jamming, etc. Can be prevented.

By the way, when the original is long, the front end and the end of the original after the first side reading are respectively the extra roller 26 and the second press roller 29 which are the reversing means, and the extra roller 21 and the second which are the conveying means. Press roller 27
On the other hand, while being fed by different roller groups, the leading edge of the document after the second side reading and its trailing edge are both conveyed by the extra roller 26 and the second press roller 29, which are reversing means. Since the feeding directions are opposite to each other, in this embodiment, the extra roller 26 and the first press roller 27 constituting the conveying means are always in sliding contact with each other, while the extra roller 26 constituting the reversing means is in contact with each other. The second press roller 29 can be separated and joined.

In this way, the extra roller 26 and the second press roller 29 are separated from each other, and the leading edge of the original after reading the second surface and the trailing edge of the original are fed to the other rollers 28, 31, 32 ,.
It is conveyed by 33 and the rollers 26 and 29 are smoothly rubbed against each other. However, in order to separate and join the extra roller 26 and the second press roller 29 in this way, the elevating mechanism 43 including a motor, a cam, etc.,
Alternatively, an electromagnetic lifting mechanism including a solenoid is used, which increases the product cost. Therefore, in the present embodiment, the use of the elevating mechanism 43 or the electromagnetic elevating mechanism is minimized, that is, the extra roller 26 and the second press roller 2 constituting the reversing means.
The cost of the device is reduced by the structure in which the device is separated and joined only with the device 9.

Next, the internal structure of the ADF 8 of the automatic sheet conveying apparatus according to the second embodiment of the present invention will be described. First, when the flow of the document feeding path is outlined, as shown in FIG. 12, the ADF 8 is provided with a first document feeding path R1 having a “c” shape in side view and a side view substantially from the paper feeding port 8a to the paper exit 8b. A second document transport path R2 ′ having an “ε” shape is formed. An extra roller 26 is arranged near the paper discharge port 8b, and a press roller 29 is arranged below it. Further, a nip portion between the separate roller 22 and the retard roller 23 is arranged near the paper feed port 8a.
Arms 20 and 20 are swingably arranged from both ends of the arm 20 to the front, and a pickup roller 21 is pivotally supported on the front ends of the arms 20 and 20. Then, the nip portion between the slave feed roller 24 and the master feed roller 25 and the extra roller 26 are provided along the “ε” -shaped second document transport path R2 ′ from the paper feed port 8a to the paper discharge port 8b. The nip portion between the press roller 29, the nip portion between the giant feed roller 28 and the first slave roller 31, the giant feed roller 28 and the second slave roller 32
, A nip portion between the giant feed roller 28 and the third slave roller 33, and again a nip portion between the extra roller 26 and the press roller 29.

The pick-up roller 21, the separate roller 22, the retard roller 23 and the like separate the sheet originals accumulated on the original supply tray 9 one by one and feed them from the paper feed port 8a to the original conveying path. I am trying.

Here, the upper half of the second document feeding path R2 is a reversing means for reversing the sheet document fed from the paper feed port 8a before the reading, and includes the extra roller 26 and the press roller 29. Is a conveying means for reversing the conveying direction of the sheet originals which are turned upside down and conveying the sheet originals onto the platen glass 12. The conveying direction of the sheet originals read on the platen glass 12 is reversed and the platen glass 12 is again conveyed. It is a reversing means that conveys upward. Then, the giant feed roller 28 and the slave roller 31.
Reference numerals 32 and 33 are guide means for guiding the sheet original onto the platen glass 12.

Of the above-mentioned rollers, the roller shafts 25a, 26a, 28 of the master feed roller 25, the extra roller 26, and the giant feed roller 28, respectively.
In a, both shaft ends are axially supported by the side plates of the ADF8 apparatus main body, and are fixed in position.
25, 26, 28 are adapted to be driven by a drive source and a transmission mechanism arranged inside either or both of the side frames 7a, 7b. That is, the rollers 22, 25, 26, and 28 are drive rollers, and the rollers 24, 29, 31, 32, and 33 that are in contact with the rollers are rollers that are driven by the drive rollers.

A first guide member 37 is arranged slightly behind the nip portion between the slave feed roller 24 and the master feed roller 25, and at a first branch position between the first document transport path R1 and the second document transport path R2 '. The first guide member 37 is vertically rotated about a rotation fulcrum shaft 37a so that a document conveyance path can be selected. That is, when the reading surface of the original is selected by the screen operation of the function keys 18 provided on the key panel 13 and the single-sided reading mode is set, the first guide member 37 is rotated to the lower position A and the original is moved. Is conveyed to the first original conveying path R1 and when the double-sided reading mode is set, the first guide member is rotated to the upper position B, and the original is conveyed to the second original conveying path R2 ′. ing.

A second guide member 38 is provided at a second branch position downstream of the first branch position in the second document transport path R2 ', and the guide member 38 is at the lower position C.
Alternatively, it is rotated to the upper position D to control the passage direction of the document. Further, a third guide member 39 is arranged at a third branch position downstream of the second branch position (on the side of the sheet discharge port 8b) in the second document transport path R2 ′, and the guide member 39 is provided.
Is rotated to a lower position E or an upper position F to control the document passage direction.

Further, the first position detecting sensor is provided at an appropriate position on the second document feeding path R2 'between the nip portion between the slave feed roller 24 and the master feed roller 25 and the nip portion between the extra roller 26 and the press roller 29. 35 is provided, and a second position detection sensor 36 is provided near the confluence of the first document transport path R1 and the second document transport path R2 'to detect the passage of each document. The rotation shaft 26a of the extra roller 26 and the rotation shaft 28a of the giant feed roller 28 have a first angle sensor 46 and a second angle sensor 48, respectively, which detect the rotation angle of each roller.

Further, the controller 40 of the image reading apparatus according to the second embodiment of the present invention, which is equipped with a document front / back reversing mechanism.
Has the same configuration as the controller 40 of the image reading apparatus according to the first embodiment of the present invention, and is connected to the sensors and control members shown in FIG.

The control configuration of the document front / back reversing mechanism according to the second embodiment of the present invention is schematically shown in FIG.
, And the details will be described below. As shown in FIG. 14, first, the user sets the sheet original on the original feeding tray 9 with the front side up and operates the function keys 18 of the key panel 13 to change the original reading surface mode to the double-sided reading mode. (Step T1). Here, a control signal (switching signal) is input from the controller 40 to each of the guide members 37, 38, 39, the first guide member 37 is at the upper position B, the second guide member 38 is at the lower position C, and the third guide member. The member 39 switches to the lower position E (step T2).

When the user presses the start button 19 arranged on the key panel 13 (step T3),
A control signal is input from the controller 40 to the extra roller 30, the drive source 41 of each of the rollers 22, 25, 26, 28 and the transmission mechanism 42 thereof. As a result, the extra roller 26 starts rotating in the reverse direction (counterclockwise direction in FIG. 12) (step T4), and the uppermost sheet original (1) is picked up by the pickup roller 21, the separate roller 22, the retard roller 23 and the like. Only the first sheet original is separated and fed from the paper feed port 8a to the original feeding path, and then inherited by the master feed roller 25 and the slave feed roller 24, and the second original feeding path R
It is transported to 2 '(step T5).

Then, the first sheet document is discharged by the extra roller 26 and the press roller 29 to the discharge port 8.
When the first position detecting sensor 35 detects the passage of the trailing end of the first sheet original from step b, the control signal notifies the controller of the detection. A control signal is output from the controller 40 to the second guide member 38 and the extra roller 26.

In the controller 40, when the first position detection sensor 35 detects the passage of the trailing end of the first sheet document, the trailing end of the sheet document is moved from the position of the first position detection sensor 35 to the third guide. The rotation angle (first rotation angle) of the extratler roller 26 is controlled so that the sheet document is further fed by a distance that is conveyed between the member 39 and the nip position between the extra roller 26 and the press roller 29. is doing. That is, as shown in FIG.
After the first rotation angle is detected by the first angle sensor 46 (step T7), most of the first sheet document is discharged from the sheet discharge port 8b, and only the end portion of the first sheet document is the extra roller 26. While being nipped with the press roller 29, the second guide member 38 is switched to the upper position D so that the sheet document is not fed backward in the direction of the paper feed port 8a at this moment (step T8). At the same time, the extra roller 26 is rotated in the forward direction (clockwise direction in FIG. 12) (step T9), and the first sheet document is fed back in the opposite direction by the extra roller 26 and the press roller 29.

The switchback-reversed first sheet document is drawn by the giant feed roller 28 and the first slave roller 31, and the leading end of the first sheet document is detected by the second position detection sensor 36. Then (step T10), a control signal notifying the detection is output to the controller 40, and the control signal is output from the controller 40 to the lifting mechanism 43 of the press roller 29 and the reading device 6.

Here, the press roller 29 is lowered to separate the extra roller 26 and the press roller 29 from each other (step T11). This allows the rollers 26.2
Between sheet 9 and sheet 9, the leading edge and trailing edge of the sheet document, whose conveyance directions are opposite to each other, smoothly rub against each other without being interfered by both rollers 26 and 29. Further, in the controller 40, when the second position detection sensor 36 detects the passage of the leading edge (the end before the switchback inversion) of the first sheet document, the second angle sensor 48 detects the sheet document. The rotation angle (second rotation angle) of the giant feed roller 28 corresponding to the distance at which the front end is conveyed from the position of the second position detection sensor 36 to the rear end position of the platen glass 12 is measured, and the rotation angle is set to the second rotation angle. After reaching (step T12), first, reading of the back surface of the first sheet original is started (step T13).

Then, as shown in FIG. 16, the first sheet of the original is the giant feed roller 28 and the second sheet original.
Slave roller 32 or third slave roller 33
And the second position detection sensor 36
When it is detected that the trailing edge of the first sheet document has passed (step T14), the detection signal is output to the controller 40. Then, from the controller 40, the lifting mechanism 43 of the press roller 29, the third guide member 3
Control signals are output to the 9, the extra roller 26, and the reading device 6, respectively.

In the controller 40, when the second position detection sensor 36 detects the passage of the trailing end of the first sheet document, the third guide member 39 is switched to the upper position F (step T15), and the extra roller is moved. Two
6 is rotated in the reverse direction (counterclockwise direction in FIG. 12) (step T16), and the press roller 29
To raise the extra roller 26 and the press roller 2
9 and 9 are returned to the contact state (step T17). Further, from this time point, the rotation angle of the giant feed roller 28 (third rotation angle) corresponding to the distance at which the end of the sheet document is conveyed from the second position detection sensor 36 position to the front end position of the platen glass 12 by the angle sensor 48. :
(3rd rotation angle)> (2nd rotation angle)), the end of the sheet document is moved from the position of the second position detection sensor 36 to the third guide member 39, the extra roller 26, and the press roller 29. The rotation angle (fourth rotation angle) of the giant feed roller 28 corresponding to the distance conveyed to the nip position is measured, and after reaching the third rotation angle (step T18), one sheet is fed. The reading of the back surface of the sheet original of the eye is completed (step T19).

Further, after the fourth rotation angle is detected by the angle sensor 48 (step T20), most of the first sheet document is discharged from the sheet discharge port 8b, and only the end portion thereof is the extra roller. The third guide member 39 is switched to the lower position E (step T21) while being nipped between the 26 and the press roller 29, and the extra roller 26 is rotated in the forward direction (clockwise direction in FIG. 12). (Step T22).

In this way, the first sheet original is conveyed and passed to the giant feed roller 28 and the first slave roller 31, and as shown in FIG. 17, the leading edge (2 The end before the second switchback inversion, that is, the leading end when set in the paper feed port 8a becomes the traveling direction side again) is the second position detection sensor 3
When detected in step 6 (step T23), the detection signal is output to the controller 40. Then, a control signal is output from the controller 40 to the lifting mechanism 43 of the press roller 29 and the reading device 6.

Here, the press roller 29 is lowered to separate the extra roller 26 and the press roller 29 from each other (step T24). In addition, the controller 4
In the case of 0, the angle sensor 48 starts when the leading edge of the first sheet document is detected by the second position detection sensor 36.
Starts to measure the rotation angle of the giant feed roller 28, and after reaching the second rotation angle (step T
25) Reading of the front surface of the first sheet original is started (step T26).

Thereafter, the first sheet original is fed with the giant feed roller 28 and the second slave roller 32.
Alternatively, when the sheet is conveyed by the third slave roller 33 and the second position detection sensor 36 detects that the trailing end of the first sheet document has finished passing (step T2).
7), the detection signal is output to the controller 40, and control signals are output to the elevating mechanism 43 of the second guide member 38, the third guide member 39, the extra roller 26, and the press roller 29, respectively, and then the reading device 6 Control signals are output to the transmission mechanism 42 of the drive source 41.

Here, the third guide member 39 is moved to the upper position F.
To the second guide member 38 (step T28).
To the lower position C (step T29), and
The rotation of the extra roller 26 is reversed in the reverse direction (counterclockwise direction in FIG. 12) (step T30), and the press roller 29 is further raised to return the extra roller 26 and the press roller 29 to the contact state. (Step T31). Further, as shown in FIG. 18, in the controller 40, the angle sensor 48 detects the rotation angle of the giant feed roller 28 from when the second position detection sensor 36 detects the passage of the trailing end of the first sheet document. After the measurement is started and the third rotation angle is reached (step T32), the reading of the front surface of the first sheet original is finished (step T33). Then, by the pickup roller 21, the separate roller 22, the retard roller 23, etc., the next uppermost sheet document (2
Only the first sheet original is separated and taken into the original conveying path from the paper feed port 8a, and the second original sheet is fed to the master feed roller 25 and the slave feed roller 24.
And the sheet is conveyed to the second document conveying path R2 '(step T3).
4).

In this way, after both sides of the first sheet original have been read, the second sheet original is conveyed toward the sheet discharge port 8b, and the second position original is detected by the first position detection sensor 35.
When the passage of the leading edge of the first sheet document is detected (step T35), a control signal notifying the detection is output to the controller 40, and the control signal (switching signal) is output from the controller 40 to the third guide member 39. Then, the third guide member 39 is switched to the lower position E (step T3
6). Of course, here, the first sheet document has already been discharged by the extra roller 26 and the press roller 29.
It is discharged from b.

Thereafter, the second sheet original returns to step T6 shown in FIG. 15, is conveyed by following the flow up to step T33, the original is read, and the sheet originals are read one after another. .

However, in the case of the last one sheet original, the next original is to be taken in at the time when step T33 shown in FIG. 35 does not work, and ends after waiting a predetermined time.

The controller 40 measures the third rotation angle of the giant feed roller 28 by the angle sensor 48 in step T32 shown in FIG. 18, and then measures a predetermined rotation angle equal to or larger than the fourth rotation angle. If the passage of the document is not detected by the first position detection sensor 35 even after a predetermined time has elapsed (step T
37), all rollers are stopped (step T38). Of course, at this time, the last sheet document is discharged from the sheet discharge port 8b by the extra roller 26 and the press roller 29. In this way, reading from the first sheet document to the last sheet document is performed.

In both of the above-mentioned embodiments, the main body of the ADF 8 is formed to be long in the front-rear direction, and at the time of conveyance / reading after the switchback, even for a large sheet original such as A3 size, the leading end and the trailing end of the roller 26 are provided. In a double-sided image reading apparatus having a conveyance path that is long enough not to overlap at the nip position of 29, the elevating mechanism 43 of the press roller 29 is not required, and the number of parts can be reduced and cost can be reduced. . In this case, in the flow of sheet document conveyance,
In the embodiment, the operations of steps S25 and S30 are eliminated, while in the second embodiment, the operations of steps T12, T16, T25, and T29 are eliminated. Of course, other processing operations are performed according to the flow charts shown in FIGS. 6 to 11 in the first embodiment and FIGS. 14 to 18 in the second embodiment.

In both of the above embodiments, the document transport distance is measured by using the angle sensors 46 and 48, but instead, the drive source 41 may be measured by using a step motor. In this step motor, pulses are sequentially applied to the multiphase windings of the stator, and the rotor rotates by a constant angle for each pulse.
Then, the number of rotation steps of the step motor is counted,
By this step control, the conveyance distance of the sheet original is measured.

The two embodiments of the present invention have been described above. However, in such a configuration, the original surface of the sheet original is inverted before reading at the initial stage of conveyance, and then the original is sent to the reading unit 2. It is only necessary to pass the platen glass 12 twice, and the reading time on both sides of the original can be shortened. Moreover, in such a configuration, the sheet original placed on the paper feed tray 9 with the front side facing upward is first read from the back side, inverted to read the front side, and then discharged with the front side facing down. Then, the next original is sequentially ejected onto it, and the page order is aligned.

In particular, the original supplied from the original supply tray 9 is turned upside down while being conveyed along the second original conveying path R2 ', and the conveying direction is reversed by the extra roller 26 and the press roller 29. After that, the sheet is conveyed toward the platen glass 12 side which is the reading unit, and further, the giant feed roller 28 and the slave rollers 31, 32.3.
The sheet document is nipped by 3 and conveyed to the platen glass 12 while being surely guided, so that the sheet document does not enter the platen glass 12 from obliquely above, and reading failure due to skew of the document or document jamming occurs. Can be prevented.

[0084]

Since the present invention is configured as described above, it has the following effects. That is, claim 1
The paper supplied from the paper supply section before
Reversing means for reversing the inside and how to convey the paper that has been turned upside down
Conveying means for reversing the direction and conveying to the reading section
The guide means for guiding to the taker and the reading process by the reader
A reverse hand that reverses the paper transport direction and transports it again to the reading section.
Image reading that has a step and can read both front and back sides of the paper
The sheet collecting device is a sheet collecting device,
A paper ejection port 8b is provided directly below the paper feed port 8a for feeding originals.
At the upper and lower intermediate position between the paper feed port 8a and the paper discharge port 8b.
Switch before scanning the paper supplied from the paper supply unit.
After the temporary discharge port 8c that reverses the back is provided and is read
At the paper exit 8b through which the original document is ejected
Reverses the direction of conveyance of the paper that has been read by the printer and reads it again.
By performing the switchback reversal for transporting to the take-in section, it is only necessary to pass through the reading section twice, and it is possible to shorten the reading time on both sides of the paper. Further, since the sheet whose paper has been turned upside down is sandwiched by the conveying means and the conveying direction is reversed and the guiding means surely feeds the sheet to the reading section, the sheet is not skewed with respect to the reading section, and reading failure occurs. It is possible to prevent paper jams and paper jams. Further, in such a configuration, the paper placed on the paper feed tray with the front surface facing upward is read from the back surface through the reversing unit, and further, the front surface is read through the reversing unit and the front surface is directly read. The sheets are ejected downward, and the next sheet is ejected on top of them to complete the page order.

In addition, as in claim 2, according to claim 1,
In the image reading apparatus, the temporary discharge port 8c and the discharge port 8b
An extra roller 26 is provided between the
First press roller 27 and second press roller 29 are provided
The extra roller 26 and the first press roller 27
However, the sheet originals that are
It is a transporting means for transporting the extra roller 26 and the second roller.
The reading roller 29 and the reading process are performed on the platen glass 12.
Reverse the conveyance direction of the processed sheet original, and
By using the reversing means for conveying onto the glass 12 , the number of parts can be reduced and the cost can be reduced.

[0086]

[Brief description of drawings]

FIG. 1 is a perspective view of a facsimile that employs an image reading apparatus.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a side sectional view of the ADF according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a control configuration of an image reading apparatus according to the present invention.

FIG. 5 is a flowchart showing an outline of a control configuration of the image reading apparatus according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing an initial stage of the control configuration of the image reading apparatus according to the first embodiment of the present invention.

FIG. 7 is a flowchart similarly showing the second stage.

FIG. 8 is a flow chart showing a third step of the same.

FIG. 9 is a flowchart similarly showing the first half of the loop portion.

FIG. 10 is a flow chart showing the latter half of the loop unit.

FIG. 11 is a flow chart showing the final step of the same.

FIG. 12 is a side sectional view of an ADF according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing the outline of the control configuration of the image reading apparatus according to the second embodiment of the present invention.

FIG. 14 is a flowchart showing the initial stage of the control configuration of the image reading apparatus according to the second embodiment of the present invention.

FIG. 15 is a flowchart similarly showing the second stage.

FIG. 16 is a flowchart similarly showing the third stage.

FIG. 17 is a flowchart similarly showing the fourth step.

FIG. 18 is a flowchart similarly showing the final stage.

[Explanation of symbols]

8 ADF 8a Paper feed port 8b Paper exit 8c Temporary discharge port 9 Paper tray 17 Output tray 26 Extra Roller 27 First Press Roller 28 Giant Feed Roller 29 Second press roller R2 Second paper feed path (first embodiment) R2 'Second paper feed path (second embodiment) R3 Third paper transport path

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 85/00 B65H 29/58 B65H 29/60

Claims (2)

(57) [Claims] 1. A reversing device for reversing the front and back of a paper supplied from a paper supply unit before reading, a conveying device for reversing the conveyance direction and conveying the paper to the reading unit, and a reading unit for the paper. and guide means for guiding the conveying direction of the reading treated sheet by the reading unit reverses to, and a reversing means for conveying the re reader allows reading of both sides of the paper image
An image reading apparatus, which feeds sheet originals accumulated on the original supply tray 9
A paper discharge port 8b is provided immediately below the paper feed port 8a and
A paper supply unit is provided at an intermediate position above and below the paper discharge port 8b.
Temporary ejection to switch back the fed paper before scanning
Before the document after being read is ejected by providing the exit 8c
At the sheet discharge port 8b, the reading processing is performed by the reading unit.
A switch that reverses the paper transport direction and transports it again to the reading unit.
An image reading device characterized in that it is configured to perform a chi-back inversion . 2. The image reading apparatus according to claim 1,
Extra low is provided between the temporary discharge port 8c and the discharge port 8b.
And a first press roller 27,
The second press roller 29 is provided, and the extra roller 26
And the first press roller 27, the sheet original is turned upside down.
It is a conveyance means that reverses the conveyance direction of the draft and conveys it.
The strut roller 26 and the second press roller 29 are
How to transport sheet originals that have been read on the front glass 12
Reverse direction, reverse direction and convey again onto platen glass 12
An image reading device characterized in that it is a means .