JP2002080148A - Double image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double image reader for shortening a time required for reading the double faces of a document and discharging the document being put in the order of original pages. SOLUTION: A second document carrying passage R2 where the document is turned upside down so that its second face can be read after the first face is read is formed a passage for carrying the document in one direction without reversing the carrying direction. A reversing member is provided for nipping the document at its end after the first face is read and moving it to the second document carrying passage R2. The reversing member has an extra roller 30 for guiding the document to be carried, arms 33, 33 extending from a rotating shaft 30a of the extra roller 30, and a planetary guide roller 31 mounted at the end of the arms 33, 33. The planetary guide roller 31 which is pressed against the extra roller 30 using the arms 33, 33 can be moved along the extra roller 30.

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 sequentially and reading both sides of the original.

[0002]

2. Description of the Related Art In a conventional image reading apparatus, when reading both sides of a document, the document is first fed to a reading section and the first document is read.
After reading the surface (front side) and transporting the document to the discharge port on the discharge tray by the discharge roller, the rotation direction of the discharge roller nipping the trailing end of the document in the feeding direction is reversed, and the document is reversed through the document return path. The document is fed to the reading unit again, and then the second side (back side) of the document is read and discharged to the discharge tray. Further, as an improvement of the above technology, the original conveyed to the discharge port after reading both sides is switched back again, and is again conveyed to the reading unit through the original return path, at which time the reading unit performs reading. There is also a technique in which the document is passed through the document as it is, discharged with the front side of the document facing down, and sequentially stacked while rearranging the pages stacked in the sheet feeding port in the order.

[0003]

However, in the above prior art, in order to rearrange the original pages after reading both sides of the document, the document is fed back to the document return path after being switched back on the paper discharge tray and fed back to the document return path. The paper was discharged onto the paper output tray with the front and back turned upside down and sequentially stacked.
As a result, the document passes through the reading unit three times,
In the first pass, the document is passed through the document reading unit even though the document is not read, so that the next document cannot be fed during that time, which has been an adverse effect of improving the document reading speed. . Furthermore, after scanning both sides of the original, the original must be conveyed again through the original return path, which increases the original conveyance distance, which may damage the original in the conveying path or cause the original to jam. Will inevitably be higher.

In view of the foregoing, the present invention provides a double-sided image reading apparatus which reduces the time required for reading both sides of a document and discharges the discharged document in the original page order. That is the task.

[0005]

The present invention uses the following means to solve the above problems.
That is, as described in claim 1, a paper feed tray and a paper output tray are vertically arranged, a transport path is provided between the paper feed tray and the paper output tray, and a reading unit is provided in the meantime. An image reading apparatus for sequentially reading a first surface and a second surface of a document by the reading unit, wherein after reading the first surface of the document, the document is conveyed in one direction without reversing the conveyance direction of the document and the second surface is read; There is provided a front / back inversion path for reading the image.

According to a second aspect of the present invention, a reversing member is provided in the conveyance path of the double-sided image reading device for navigating the leading end thereof and moving to the reversing path after reading the first surface of the document.

[0007] Further, according to a third aspect of the present invention, the reversing member includes an arc-shaped guide member provided at a discharge portion of a transport path;
An arm member extending from the guide member and a roller member attached to the tip of the arm member, the roller member is pressed against the guide member, and can be moved along the guide member in that state. To

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a facsimile employing a two-sided image reading apparatus, FIG. 2 is a side sectional view of the same, FIG. 3 is a side sectional view of an ADF of the two-sided image reading apparatus according to the present invention, and FIG. FIG. 5 is a block diagram showing the control configuration of the reading apparatus, FIG. 5 is a flowchart showing the first half of the control configuration of the double-sided image reading apparatus according to the present invention, FIG. 6 is a flowchart showing the middle half thereof, and FIG. FIG. 8 is a side sectional view of an ADF of a double-sided image reading apparatus according to another embodiment of the present invention.

A double-sided image reading apparatus according to the present invention will be described first with reference to a facsimile apparatus as an example. The facsimile apparatus shown in FIGS. 1 and 2 includes a reading unit 1 disposed above a recording unit 2. The recording unit 2 is provided with a recording device 3 and a paper feed cassette 4 which are vertically arranged inside. The paper deposited in the paper feed cassette 4 is fed to the recording device 3 for recording, and then the recording paper is discharged. It is configured to discharge to the tray 5.

The reading section 1 has a hinge 10b extending from the bottom surface of a reading case 10 which is a part of the reading section 1, and is pivotally supported on a hinge pin 1a provided in the recording section 2. With respect to the recording section 2, the recording section 2 can be turned up and down about the hinge pin 1a as a fulcrum.

In the reading section 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 provided.
The reading device 6 moves from the solid line position in FIG. 2 to the virtual line position to scan the original placed on the stationary original placing bed 11.

Above the reading case 10, a document holding cover 7 which can be opened and closed about one side thereof is arranged, and a document placed on the stationary document loading bed 11 is held by the document holding cover 7. Pressing from above.

An ADF is attached to one end of the document holding cover 7.
(Automatic Document Feeder / Auto Document Feeder)
8 is attached. As shown in FIG. 1, the exterior portion of the ADF 8 has side frames 7a and 7b standing in parallel in a direction orthogonal to the scanning direction of the reading device 6, and a document of the ADF 8 is provided between the side frames 7a and 7b. The ADF cover 14 that covers the entire transport unit is disposed so as to be sandwiched. A sheet metal side plate (not shown) is fixed in an upright state on an inner opening surface of each of the side frames 7a and 7b along the ADF cover 14 side end.
Among the respective feed rollers described later, each shaft end of the roller shaft of the drive roller is supported. One or both of the side frames 7a and 7b cover the drive source of the drive roller and its transmission system, and the inner surface thereof is covered with the side plate.

The document holding cover 7, the side frames 7a and 7b, the both side plates, the driving source for the driving roller and the transmission system to be provided form an apparatus main body of the ADF 8, and are sandwiched between the left and right sides of the apparatus main body. The document feeder covered by the ADF cover 14 is provided to constitute the ADF 8 as a whole.

A document supply tray 9 is provided above the document holding cover 7 so as to be continuous with the paper feeding port 8a of the ADF 8, and the document feeding tray 9 of the ADF 8 A document discharge tray 7c is integrally formed so as to be continuous with a paper discharge port 8c disposed immediately below the port 8a. The ADF 8 has a paper feed port 8a to a paper discharge port 8c.
A document transport path is configured up to this point.

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

As described above, the reading unit 1 is used as a flat bed type scanner that scans the reading device 6 to read a still original, and also reads the original while feeding the original to the ADF 8 with the reading device 6 fixed in position. It is configured to be able to be used as a sheet feed type scanner for performing the operation.

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

Next, the AD of the double-sided image reading apparatus according to the present invention will be described.
The internal structure of F8 will be described. In this description, in the side view shown in FIG. 3, the document transport direction is the front-rear direction (the paper feed path 8a and the paper discharge port 8c side is forward in the document transport path, and the curved portion (transport direction folded portion) side is backward in the document transport path). And.)
The horizontal direction is defined as a horizontal direction, and the front, rear, left, and right positions of each structure are described.

First, an outline of the document conveying path according to the present invention will be described. As shown in FIG. 3, the paper discharge port 8c is provided between the upper and lower document feed trays 9 and the document discharge tray 7c. A transfer port 8b is provided below the transfer port 8b to take the original document again into the transport path. A first document transport path R1 is formed from the paper feed port 8a to the paper discharge port 8c in a shape in which the character “T” is turned left and right as viewed from the side, and a document is formed in a continuous part of the first document transport path R1. The platen glass 12 serving as a reading position is provided.

A second document transport path R2 extends rearward from the receiving port 8b.
Is communicated with the first document transport path R1 immediately before the first document transport path R1. Further, a junction R is provided behind the paper discharge port 8c in the first document transport path R1, and a third point is located rearward from the junction R.
An original transport path R3 is extended and communicates with the first original transport path R1 at a position above the platen glass 12. Here, a communication point between the first document conveyance path R1 and the second document conveyance path R2 is a junction point Q, and a communication point between the first document conveyance path R1 and the third document conveyance path R3 is a branch point P. In addition, concave spaces 8d and 8e are respectively recessed above the front of the exit of the first document transport path R1 and below the front of the entrance of the second document transport path R2.

Next, regarding the arrangement of the rollers for feeding the sheet document, an extra roller 30 for guiding the sheet document along the rotation surface thereof is disposed between the transfer port 8b and the paper discharge port 8c. ing. The extra roller 30
Is configured to be rotatable in the forward and reverse directions. Arms 33 are rotatably attached to the rotation shaft 30a.
A planetary guide roller 31 is pivotally supported at the tip of 33. At this time, the planetary guide rollers 31
And the extra roller 30 are slid in contact with each other, and the slidable contact portion (nip portion) is designated by E. The arm 33
A first feeler sensor 34 is attached to the rotating shaft 31a of the planetary guide roller 31 that supports the 33, and the first feeler sensor 34 detects passage of the leading edge of the document.

Thus, the first side of the document (hereinafter referred to as "front side")
After reading, the sheet original conveyed to the discharge port 8c with its front side down is sandwiched by the nip portion E by control described later, and the extra roller 30 is rotated in the normal rotation direction (clockwise in FIG. 3) in that state. Let the arm 33
Let 33 go around. In this way, the arms 33 are rotated half a turn, and the sheet document is transferred from the discharge port 8c to the transfer port 8b.
After that, the rotation of the extra roller 30 is temporarily stopped, and the sheet document is unlocked. At this time, the planetary guide roller 31 is engaged with the concave space 8e in front of the entrance to the second document transport path R2, so that the rotation of the arms 33 is also restricted, and thus,
The unlocked sheet document is fed into the second document transport path R2 by the extra roller 30 and the planetary guide roller 31 that have started to rotate in the forward rotation direction again. The extra roller 30 and the arm 3
3. The second mechanism is constituted by a reversing mechanism constituted by a planetary guide roller 31 and a first feeler sensor 34 and the like.
In the document transport path R2, the second surface of the document (hereinafter, “back side”) is downward, and the second document transport path is a so-called reversal path according to claim 1 or claim 2, Next, the back side of the sheet document is read via the reversing mechanism and the reversing path.

A nip portion A between the separate roller 22 and the retard roller 23 is provided near the paper feed port 8a, and the arms 20 can swing forward from both ends of the separate roller 22. And the arm 2
A pickup roller 21 is pivotally supported at the front end of the pickup roller 0.20. Further, a large feed roller 24 is disposed above the platen glass 12, and thus the paper feed port 8 is provided.
a, a nip portion A between the separate roller 22 and the retard roller 23, a nip portion B between the feed roller 24 and the first guide roller 25, and A nip C between the roller 24 and the second guide roller 26, a nip D between the extra roller 30 and the third guide roller 32, and a nip E between the extra roller 30 and the planetary guide roller 31 are arranged in this order. ing. A nip F between the slave roller 27 and the master roller 28 is provided between the junction P and the junction R in the third document transport path R3.

Thus, the pickup roller 21,
The sheet documents stacked on the document supply tray 9 are separated one by one by a separate roller 22, a retard roller 23, and the like, and are fed from the paper feed port 8a to the document conveyance path. An arc-shaped separator 36 is disposed on the rear side of the feed roller 24, and the separator 36 and the first guide roller 25 are configured to be slidable back and forth by a cam mechanism or the like (not shown). . In a normal state, the separator 36 is connected to the feed roller 2.
4, the feed roller 24 and the first guide roller 25 are in sliding contact with each other, and when the separator 36 and the first guide roller 25 are slid rearward by the cam mechanism or the like, The separator 36 protrudes rearward from the rotation surface of the feed roller 24,
The sheet document passing through the first document transport path R1 does not come into contact with the rotation surface of the feed roller 24, and
Along with the feed rollers 24
Also, the contact between the first guide roller 25 and the first guide roller 25 is released, and the first guide roller 25 does not follow, and the sheet document can pass through the first document transport path R1 without being subjected to the rotational resistance by the feed roller 24. . That is, when the sheet document is transported from the second document transport path R2 to the third document transport path R3, the transport direction of the sheet document and the rotation direction of the feed roller 24 are opposite.
6 prevents contact between the sheet document and the feed roller 24.

Of the above-mentioned rollers, the feed roller 2
4. The respective roller shafts 24a, 28a, 30a of the master roller 28 and the extra roller 30 have both shaft ends pivotally supported by the respective side plates of the ADF 8 apparatus main body, and are fixed in position. 28 and 30 are driven by a drive source and a transmission mechanism disposed inside one or both of the side frames 7a and 7b shown in FIG. That is, the rollers 22, 24, 28.3
Reference numeral 0 denotes a driving roller, and each of the rollers 25, 26, 27, 31, and 32 that comes into contact with each other is a driven roller that rotates with each driving roller.

A turning fulcrum shaft 37a is provided immediately before the branch point P between the first document transport path R1 and the third document transport path R3 to switch between the document transport paths R1 and R3. A first guide member 37 is provided, and a second guide member 38 for switching between the document transport paths R1 and R2 is provided at the junction Q with the rotation shaft 26a of the second guide roller 26 as a pivot point. I do. The guide members 37 and 38
The rotation fulcrum shaft is clamped by a spring or the like, lightly urged to close one path, the path is determined by the direction of document transport, a flexible member such as a film is used, and its elasticity, Alternatively, there is a device that opens and closes a route using its own weight, and a device that switches the route electrically using an actuator such as a solenoid. Here, the former is adopted as the guide members 37 and 38, and the rotation fulcrum shaft is held by a spring (not shown).

In front of the branch point R, a second feeler sensor 35 for detecting the passage of a sheet document is provided vertically. Reference numeral 35a denotes a rotation fulcrum shaft of the second feeler sensor 35. Further, a potentiometer is attached to a rotating shaft 31a which is a rotation fulcrum shaft of the first feeler sensor 34. And the merging point P
A position detection sensor 44 is provided in the vicinity.

Further, as shown in FIG. 4, the controller 40 is also connected to the following control members.
It controls the conveyance pattern of the sheet document. 34 ・ 35
Is a feeler sensor in which a potentiometer is attached to the rotation fulcrum shaft, and detects the passage of a document by rotating the feeler sensor, and transmits a control signal (detection signal) to the controller. Reference numeral 44 denotes a position detection sensor such as a linear scale having a light source and a condensing lens placed on one side of the transport path and a light receiving element placed on the other side. When the time and the completion of the passage are detected, a control signal (detection signal) is transmitted to the controller 40.

Each roller 22, 23, 24, 28,
The drive source 41 of the drive unit 30 and its transmission mechanism 42 receive a control signal (drive signal) from the controller 40 and drive / stop the respective rollers. In particular, the extra roller 30 is controlled to be rotatable forward and reverse. Have been. still,
As the drive source 41, a pulse is sequentially applied to the polyphase winding of the stator, and a step motor or the like in which the rotor rotates by a fixed angle for each pulse is used. The controller 40 performs step control, The rotation step of the drive source 41 is measured. The separator 36 including a cam mechanism and the sliding mechanism 43 for the first guide roller 25 receive a control signal (drive signal) from the controller 40 and receive the control signal (drive signal) from the controller 40. The roller 25 is slid back and forth. Further, on the key panel 13 shown in FIG. 1, a liquid crystal panel 18 for setting a reading mode such as a conversion of single-sided / double-sided reading, a start button 19 for starting a sheet document loading operation, and a plurality of sheet documents A stop button 16 and the like for stopping the reading operation in the middle, such as when reading continuously, are arranged. When the operation of the liquid crystal panel 18, the start button 19, the stop button 16 and the like is performed, the controller 4 is stopped.
The control signal is output to 0.

Here, the flow of double-sided reading of a sheet document according to the present invention will be briefly described. As shown in FIG. In one process, the document is conveyed to the paper feed port 8a → the nip portion A → the branch point P → the nip portion B → the nip portion C → the junction R → the nip portion D → the nip portion E → the discharge port 8c to read the original surface. Then, in the second process, the leading end of the sheet document is rotated by a half turn while being locked by the lock member, and the discharge port 8c → the receiving port 8b → the junction Q → the nip section B →
The document is conveyed to a branch point P → a nip portion F → a junction R → a nip portion D → a nip portion E → a sheet discharge port 8c where the back side of the document is read and discharged. Hereinafter, both-side reading of a sheet document according to the present invention will be described with reference to flowcharts shown in FIGS.

As shown in FIG. 5, first, the user sets a sheet document on the document feed tray 9 with the front side up, and operates the liquid crystal panel 18 of the key panel 13 to
The document reading side mode is selected as the double side reading mode (step S1), and the start button 1
When 9 is pressed (step S2), a control signal (drive signal) is input from the controller 40 to the drive source 41 of each roller 22, 23, 24, 28, 30 and its transmission mechanism 42,
The pickup roller 21, the separate roller 22,
Only the uppermost sheet document (first sheet document) is separated by the retard roller 23 and the like, and is fed from the paper feed port 8a to the first document transport path R1 (step S).
3).

When the first sheet document is pushed down the first guide member 37 and passes through the branch point P, its leading end is detected by the position detecting sensor 44 (step S4), and the detection signal is output to the controller 40. You. Then, the controller 40 controls the driving source 41 to control the rotation of the driving source 41 corresponding to the distance by which the leading edge of the sheet document is transported from the position detection sensor 44 position to the rear end position of the platen glass 12 (first step). Is measured and reaches the first rotation angle (step S5).
A control signal (read start command signal) is output from the controller 40 to the reading device 6, and reading of the front surface of the first sheet document is first started (step S6).

Then, the first sheet document is the second sheet document.
It is guided by the guide member 38 in the direction of the junction R, and is conveyed by the feed roller 24 and the first guide roller 25, and by the feed roller 24 and the second guide roller 26. When the 2 feeler sensor 35 is pushed up (Step S7), the detection signal is output to the controller 40, and is fed out by the extra roller 30 and the third guide roller 32, and the extra roller 30 and the planetary guide roller 31. The leading edge of the first sheet document contacts the first feeler sensor 34. At this time, the first feeler sensor 34 swings up and down (step S8), and a control signal (detection signal) is output from the first feeler sensor 34 to the controller 40. Then, a control signal is output from the controller 40 to the extra roller 30 and the first feeler sensor 34, and the rotation of the extra roller 30 is temporarily stopped (step S9). And FIG.
As shown in (1), the planetary guide roller 31 is locked so as not to rotate, and the leading end of the first sheet document is pressed against the outer peripheral portion of the extra roller 30 (step S1).
0). Here, the extra roller 30 is rotated half a clockwise direction (clockwise in FIG. 3) (step S1).
1) The first sheet document locked by the planetary guide roller 31 in this manner is substantially
Rotate by 80 ° and transfer the tip to the inheritance port 8b. At this time, the extra roller 30 is stopped, that is, the leading end of the first sheet document is
It stops at the position b and waits until its end passes the junction Q.

When the end of the first sheet document has been detected by the position detection sensor 44 (step S12), a detection signal is output to the controller 40, and As shown, the controller 40 calculates the length of the sheet document, and calculates the end time of reading the document. That is, the rotation step of the drive source 41 from the time when the leading edge of the sheet document passes through the position of the position detection sensor 44 to the time when the trailing edge of the sheet document has passed is measured by the step control, and the document length is obtained from the rotation angle. The document size is identified.

When the document size is identified, the controller 40 rotates the drive source 41 corresponding to the document length (more precisely, the length obtained by adding the front and rear widths of the platen glass 12 to the document length). The step (second rotation angle) is selected, and the controller 40 continues the measurement, and sets the second rotation angle to the first rotation angle from the time when the leading edge of the sheet document passes the position detection sensor 44 position. Is measured, a new rotation angle (third rotation angle) obtained by adding
Is reached (step S13), a control signal (reading end command signal) is output from the controller 40 to the reading device 6, and reading of the front surface of the first sheet document is completed (step S14).

When the second feeler sensor 35 detects that the end of the first sheet document has passed (step S15), a detection signal is output to the controller 40, and the planetary guide is output. The sheet document is unlocked by the roller 31 (step S16). Then, the extra roller 30 starts to rotate in the forward rotation direction again (step S17), and further causes the separator 36 to slide backward with the first guide roller 25 (step S18). Then, the first sheet document is fed to the second document transport path R2 by the extra roller 30 and the planetary guide roller 31, and pushes up the second guide member 38 to place it on the platen glass 12. It is transported.

After the separator 36 and the first guide roller 25 are slid backward, or at the same time, the controller 40 controls the driving source 41 to control the first sheet passing through the vicinity of the receiving port 8b. The rotation step (fourth rotation angle) of the drive source 41 corresponding to the distance by which the leading edge of the sheet document is conveyed to the front end position of the platen glass 12 is measured, and after the fourth rotation angle is reached (step S19). Then, a control signal is output from the controller 40 to the reading device 6 and the sliding mechanism 43 of the separator 36, and reading of the back surface of the first sheet document is started as shown in FIG. 7 (step S20).

In the controller 40, a rotation step (fifth rotation angle) of the drive source 41 corresponding to the document length (more precisely, the length obtained by adding the front and rear width of the platen glass 12 to the document length). Is selected and the controller 40
Then, the measurement is continued and a new rotation angle (the sixth rotation angle is obtained by adding the fifth rotation angle to the fourth rotation angle from the time when the end of the sheet document has passed the position of the second feeler sensor 35).
Is measured, and after reaching the sixth rotation angle (step S21), a control signal is output from the controller 40 to the reading device 6 and the transmission mechanism 42 to the extra roller 30, and the first sheet is output. The reading of the back side of the sheet document is terminated (step S22).

On the other hand, the first sheet document is conveyed along the separator 36 without coming into contact with the feed roller 24, and is moved to the third document conveying path R3 by the first guide member 37 restored to the original position. Is fed.
Then, the first sheet document is fed out by the master roller 28 and the slave roller 27, and when the leading end pushes up the second feeler sensor 35 again (step S23), the detection signal is output to the controller 40. , From the controller 40 to the separate roller 2
Control signals (drive signals) are output to the second transmission mechanism 42 and the sliding mechanism 43. In this manner, the first sheet document is divided into the extra roller 30 and the third guide roller 32.
Is discharged to the paper discharge tray 7c (step S2).
4).

After discharging the sheet document, the extra roller 3
Numeral 0 denotes a half rotation in the reverse rotation direction (counterclockwise in FIG. 3) together with the arms 33, 33 to return the planetary guide roller 31 from the receiving port 8b to the paper discharge port 8c, and the concave space 8d at the original position. In a state where the planetary guide roller 31 is unlocked.
0 is again rotated in the forward rotation direction (step S25).

Here, taking in of the next sheet document (second sheet document) is started (step S26), and immediately thereafter, the separator 36 and the first guide roller 25 are slid forward. Return to the original position, nip the feed roller 24 and the first guide roller 25 again,
A state in which the sheet can be fed forward is set (step S27). Then, the leading end of the second sheet document is detected by the position detection sensor 44.
Is detected (step S28), the process returns to step S5, and both sides of the second sheet document are read in accordance with the above flow. In this manner, sheet documents are successively taken in. However, when reading of both sides of the last sheet document is completed, the passage of the leading end is detected by the second feeler sensor 35 in step S24 because there is no next sheet document. From time to time, in the controller 40,
For example, by measuring a predetermined rotation angle of the drive source 41,
After waiting for a predetermined time (step S29), it is confirmed by the position detection sensor 44 that the document does not pass, and all rollers are stopped (step S30). In this way, reading from the first sheet document to the last sheet document is performed, and a series of operations is completed.

As another embodiment (another embodiment 1), FIG.
As shown in (2), a new guide roller (fourth guide roller 29) is disposed below the second guide roller 26, and the sheet document is placed on the platen glass by the second guide roller 26 and the fourth guide roller 29. The sheet may be moved in 12 directions, and the conveyance of the sheet document may be further ensured. As described above, the arrangement configuration of the rollers and the sensors, the configuration of the transport path, and the like are not limited to the embodiments described above,
Other configurations may be used as long as they are according to the third aspect.

[0044]

As described above, the present invention has the following advantages. That is, claim 1
Place the paper feed tray and the paper output tray up and down as shown in
A transport path is provided between the paper feed tray and the paper discharge tray, and a reading section is provided at the same time.
And an image reading device for sequentially reading the originals.
After reading the front side, the front and back reverse path is provided to transport the document in one direction without reversing the transport direction of the document and read the second side, so always without rotating the rollers forward and reverse with the document nipped Reading can be started from the leading end side of the fed original, which is effective in preventing damage and jamming of the original.

According to a second aspect of the present invention, in the conveyance path of the double-sided image reading apparatus, a reversing member is provided for nipping the leading end of the original after reading the first side of the original and moving to the reversing path. It is not necessary to reverse the transport direction of the original and feed it to the original return path.Because the original can be turned upside down via the reversing member, the original transport distance is shorter than in the past, preventing the original from being damaged or jammed. It is valid.

Further, the reversing member may be provided with an arc-shaped guide member provided at a discharge portion of the transport path, an arm member extended from the guide member, and a tip of the arm member. The roller is attached to the guide member, and the roller member is pressed against the guide member. In this state, the roller member can be moved along the guide member. There is no need to feed the original, and the original can be turned upside down along the guide member. Therefore, the original transport distance is shorter than in the related art, which is effective in preventing the original from being damaged or jammed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a facsimile employing a double-sided image reading device.

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

FIG. 3 is a side cross-sectional view of the ADF of the duplex image reading apparatus according to the present invention.

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

FIG. 5 is a flowchart showing the first half of the control configuration of the duplex image reading apparatus according to the present invention.

FIG. 6 is a flowchart showing a middle half of the same.

FIG. 7 is a flowchart showing the second half of the same.

FIG. 8 is a side sectional view of an ADF of a double-sided image reading apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 8 ADF 8a Paper feed port 8b Transfer port 8c Discharge port 9 Paper feed tray 30 Extra roller 31 Planetary guide roller 33 Arm 34 Lock member 34a Tip 36 Separator R1 First document transport path R2 Second document transport path R3 Third Document transport path

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 1/00 108 H04N 1/00 108M 5C062 1/04 1/12 Z 5C072 F term (reference) 2H028 BA03 BA09 BB02 BB04 2H076 AA58 BA24 BA42 BA57 BA58 BA63 3F053 EA01 EA08 EB01 EC02 ED15 ED25 LA01 LA11 LB02 3F100 AA03 BA05 CA12 CA13 DA11 EA02 EA03 3F102 AA01 AA14 AB01 BA06 BA11 DA09 DA15 5C062 AA05 AB17 BA03 AD01 BA01 AD03 XA01

Claims (3)

[Claims] 1. A paper feed tray and a paper discharge tray are vertically arranged, a transport path is provided between the paper feed tray and the paper discharge tray, and a reading unit is provided at the end of the conveyance path. In the image reading apparatus for sequentially reading the first and second surfaces of the document, the first surface of the document is read, and then the second surface is read by transporting the document in one direction without reversing the transport direction of the document. A double-sided image reading device provided with a front / back inversion path. 2. The reversing member according to claim 1, wherein a reversing member is provided on the conveyance path of the double-sided image reading device, the reversing member moving the reversing path while holding the leading end after reading the first side of the document. Double-sided image reading device. 3. The reversing member includes an arc-shaped guide member provided at a discharge portion of a transport path, an arm member extending from the guide member, and a roller member attached to a tip of the arm member. 3. A double-sided image reading apparatus according to claim 2, wherein said roller member is pressed against said guide member, and is movable along said guide member in this state.