JP3518500B2 - Double-sided document reader - 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 a document reading device capable of automatically feeding documents one by one to read both front and back sides.

[0002]

2. Description of the Related Art In a conventional document reading apparatus, when reading both sides of a document, first, the document is fed to a reading section to read the front side, and is conveyed to a discharge port on a discharge tray by a discharge roller, and then the document is read. It is configured to reverse the rotation direction of the discharge roller that holds the rear end of the sheet, reverse the document through the document return path, feed the document again to the reading unit, and then read the back surface and discharge the document to the discharge tray. It was Further, as a modification of the above technique, the document conveyed to the discharge port after the reading of both sides is completed is switched back again, and is conveyed again to the reading unit through the document returning path. At this time, the reading unit performs reading. Instead, a technique has been devised in which the documents are passed through as they are, discharged with the front side of the documents facing downward, and sequentially stacked while reordering the pages stacked in the paper feed port.

[0003]

However, in the above-mentioned prior art, in order to rearrange the original pages in order after the both sides of the original have been read, the switchback is inverted again on the discharge tray to feed the original to the original return path, and the original is returned again. The sheets were sequentially stacked by reversing the front and back so that the front side faces down and ejected to the paper ejection tray.
As a result, the document passes through the reading section three times, and
During the second pass, the original is not read, but is passed through the original reading unit. Therefore, the next original cannot be taken in until the preceding original is completely discharged. It was a harmful effect of shortening. Further, the return path is usually shorter than the length of the original document, and the leading edge side of the leading original of the switchback-reversed original reaches the discharge port through the return route while the end side of the original document is still fed at the discharge port. Since it is being sent, and the traveling direction is opposite to that of the leading end side and the trailing end side, therefore, the discharge roller is separated and the carrying force of the other rollers is used to move the leading end side and the trailing end side. I was passing each other. In order to separate the discharge rollers in this way, an expensive mechanism such as an actuator is required, which increases the cost.

In order to solve at least one of the above problems, the present invention improves the double-sided document reading device to shorten the time required to read both sides of a document, or eliminates the mechanism for separating the discharge rollers to reduce the cost. The challenge is to reduce

[0005]

The present invention uses the following means in order to solve the above problems.
A document reading device for reading both front and back sides of a document according to claim 1.
Document, place the original after scanning on the bottom of the paper feed port.
A paper ejection port for ejecting is arranged, and a second surface is provided below the paper ejection port.
Placed a temporary outlet that reverses the front and back of the document after scanning
Switch the paper output port back after reading the first side.
Also serves as a temporary discharge port when turning over
First original transport that scans the first side of the original and guides it to the exit
The feeding path consists of an arcuate path curved from the paper feed port and an arcuate path.
A ramp extending to the path and connected to the ramp to the paper exit
It consists of a horizontal path that goes to
A branch point Q is provided at the connecting position, and the first document is conveyed from the branch point Q.
Switch the document back to the circular path of the path
The second document transport path that scans the surface and guides it to the temporary discharge port
Extend and branch to the point where the arcuate path transitions to a ramp
A point S is provided, and a third point is provided from the branch point S toward the temporary discharge port.
The document transport path is extended and located between the branch point S and the temporary discharge port.
Lay the "U" in side view from the interposition to the upper horizontal path.
A fourth document transport path having a curved shape is formed .

According to a second aspect of the present invention, in the double-sided document reading apparatus according to the first aspect, the reading of the first side of the next original is controlled during the discharging operation of the preceding original.

As in claim 3, claim 1 or claim
In the double-sided document reading device according to the item 2,
The outlet is composed of three rollers.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a facsimile adopting a double-sided original reading device, FIG. 2 is a side sectional view of the same, and FIG.
4 is a side sectional view of the ADF of the double-sided document reading apparatus, FIG. 4 is an explanatory view showing a power transmission configuration to each drive roller for document transportation, FIG. 5 is a block diagram showing a control configuration of the double-sided document reading apparatus, and FIG. FIG. 7 is a side sectional view of the ADF showing the flow of originals in the first step of the double-sided original reading apparatus, FIG. 7 is a side sectional view of the ADF showing the flow of originals in the second step, and FIG. 8 is the same as the third step. FIG. 9 is a side sectional view of the ADF showing the flow of the document.
1 is a time chart of the control configuration of the double-sided document reading apparatus, FIG.
0 is a flow chart showing the first stage of the control configuration of the double-sided document reading apparatus, FIG. 11 is a flow chart showing the same second stage, FIG. 12 is a flow chart showing the third stage, and FIG. 13 is a flow chart showing the fourth stage. FIG. 14 is a flowchart showing the fifth step, and FIG. 15 is a flowchart showing the final step.

A double-sided document 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 has a recording unit 2
The reading unit 1 is arranged above the. Recording unit 2
The recording device 3 and the paper feed cassette 4 are respectively installed in the upper and lower sides, and the paper accumulated in the paper feed cassette 4 is fed to the recording device 3 and is recorded, and then is fed to the recording paper discharge tray 5. It is configured to discharge.

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,
When a document is placed on the stationary document placing bed 11, the reading device 6 moves from the solid line position in FIG. 2 to the imaginary line position for scanning.

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. The appearance of ADF8 is as shown in Fig. 1.
Side frames 7a and 7b are provided upright in parallel in a direction orthogonal to the scanning direction of the reading device 6, and an openable and closable ADF cover that covers the entire document transport section of the ADF 8 is provided between both side frames 7a and 7b. It is arranged so that 14 is sandwiched. A of each side frame 7a and 7b
A side plate made of sheet metal (not shown) is vertically fixed to the inner opening surface along the DF cover 14 side end, and for example, among the feed rollers described later, each shaft end of the roller shaft of the drive roller is Is pivotally supported. Original cover 7
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 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 8c arranged immediately below the port 8a. Inside the ADF 8, there are a paper feed port 8a to a paper ejection port 8c.
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 inserted into the paper feed port 8a. A 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 8c 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, A of the automatic sheet conveying apparatus according to the present invention
The internal structure of the DF8 will be described. In this description, in the side view shown in FIG. 3, the document transport direction is the front-back direction (the document transport path is the front on the side of the paper feed port 8a and the paper discharge port 8c, and the rear is on the side of the curved portion (transport direction folding portion)). And)
The vertical direction and the front-back position of each structure will be described with the horizontal direction as the horizontal direction.

First, the structure of the document feeding path according to the present invention will be described. As shown in FIG. 3, first, the paper feed port 8a
A first document feeding path R1 having a shape in which a substantially “?” Character is laid down in a side view is formed from the sheet discharging port 8c to the sheet discharging port 8c. The first
The document transport path R1 is an arcuate path R1a curved in a “C” shape from the paper feed opening 8a, a horizontal path R1c horizontally directed to the paper exit 8c, the arcuate path R1a and the horizontal path R1c.
And a branch point Q is provided at a rear end position of the horizontal path R1c, and a second document transport path R2 extends rearward from the branch point Q and the first document transfer path R2 is provided. They are communicated with each other at the curved portion of the document transport path R1. Here, this communication point is referred to as a confluence point P.

A branch point S is provided at a portion of the first original feeding path R1 where the arcuate path R1a transitions to the inclined path R1b, and the sheet original feeding direction is set below the sheet discharge port 8c. A temporary discharge port 8b for reversing is provided, and a third discharge is provided from the branch point S toward the temporary discharge port 8b.
The document transport path R3 is extended. A branch point T is provided at an intermediate position between the branch point S and the temporary discharge port 8b in the third document transport path R3, and a side view is seen from the branch point T to a first document transport path R1 running forward and backward.
A fourth document transport path R4 having a shape in which a “U” is laid down is formed. Here, the fourth document transport path R4 and the first
A point of communication with the document transport path R1 is defined as a confluence point R. The document transport path is formed in this way, wherein the first transport path according to claim 1 is the first document transport path R1, and the second transport path is also the horizontal path R1c of the first document transport path R1. 2 Confluence point P of the original document transport path R2 and the first original document transport path R1
Is a path composed of an arcuate path R1a from the first to the branch point S and a third document transport path R3.
The reverse path connecting the transport path and the second transport path is the fourth document transport path R4.

Next, regarding the arrangement of the rollers for feeding the sheet originals, an extra roller 30 which can rotate in the forward and reverse directions is provided between the temporary discharge port 8b and the discharge port 8c, and the originals above and below it. A first press roller 31 and a second press roller 32 are arranged so as to be in sliding contact with each other on the transport paths R1 and R3. Here, the nip portion between the extra roller 30 and the first press roller 31 in the first original feeding path R1 is E, and the nip portion between the extra roller 30 and the second press roller 32 in the third original feeding path R3 is F. .

A nip portion A between the separate roller 22 and the retard roller 23 is provided near the sheet feeding port 8a, and the arms 20 can be swung forward from both ends of the separate roller 22. The arm 20
A pickup roller 21 is pivotally supported at the front end of 20. Then, the nip portion A between the separate roller 22 and the retard roller 23 and the registration roller 2 are provided along the first document transport path R1 from the paper feed port 8a to the paper discharge port 8c.
4 and the nip portion B between the registration follow roller 25 and the first
The nip portion C between the feed roller 26 and the first slave roller 27, the second feed roller 28 and the second slave roller 2
Nip portion D of 9 and nip portion E of the extra roller 30 and the first press roller 31 are arranged in this order.

Thus, the pickup 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 first original conveyance path R1.

Of the above-mentioned rollers, the registration roller 2
4, first feed roller 26, second feed roller 2
8 and each roller shaft 24a ・ 2 of the extra roller 30
6a, 28a, 30a have both shaft ends with the above-mentioned A
The rollers 22, 24, 26, 28, 30 are axially supported by the side plates of the DF8 device main body and fixed in position, and the rollers 22, 24, 26, 28, 30 are arranged inside either or both of the side frames 7a, 7b. It is designed to be driven by a transmission mechanism. That is, as shown in FIG.
.. 23.24.26.28.30 are drive rollers, and each roller 25.27.29.3 is in contact with it.
1.32 is a driven roller that rotates with each drive roller.

Then, as shown in FIG. 3, between the first document transport path R1 and the third document transport path R3 immediately before the branch point S, the document transport paths R1 and R3 are switched. The first guide member 37 is provided, and the branch point Q
Immediately after the first document transport path R1 and the second document transport path R
2, a second guide member 38 for switching between the document transport paths R1 and R2 is disposed, and the branch point T
Immediately after the first document transport path R1 and the fourth document transport path R
4, a third guide member 39 for switching between the document transport paths R1 and R4 is provided.

The first guide member 37 is the solenoid 4
The paths are electrically switched using actuators such as 7. It is controlled to feed the sheet original to the first original feeding path R1 after reading the first side (front side) of the original and to the second original feeding path R2 after reading the second side (back side) of the original. . On the other hand, the guide member 38.3
A flexible member such as a film is used for 9 and a path is opened depending on the conveyance direction of the sheet original, and after passing the sheet original, its original weight and its elasticity return to the original position and close the path. Is configured as follows.

More specifically, the second guide member 38 is normally urged so that it can pass from the branch point R to the confluence point P and closes the path from the branch point S to the branch point R. Has been done. That is, in the conveyance from the sheet discharge port 8c to the branch point Q, the confluence point R is formed along the second guide member 38.
In the conveyance from the branch point S to the branch point Q, on the other hand, the leading edge of the sheet document is moved to the second guide member 3
When the trailing edge of the sheet document passes the branch point Q position, the second guide member 38 returns to its original position due to its own weight and its elasticity.

The third guide member 39 has substantially the same structure, and normally, it can pass from the nip portion F toward the confluence point R and close the path from the branch point S toward the nip portion F. Is urged by. That is, the temporary discharge port 8
When being conveyed from b to the branch point T, it is guided in the direction of the confluence R along the third guide member 39, while when being conveyed from the branch point S to the branch point T, the leading edge of the sheet document is conveyed. Is pushed up the third guide member 39 and conveyed toward the temporary discharge port 8b, and when the trailing end of the sheet document passes the branch point T position, the third guide member 39 is moved by its own weight and its elasticity. Return to position. Thus, the second guide member 38 and the third guide member 39 are not electrically switched, an inexpensive member is used, and the structure is simple.

Next, each sensor relating to the conveyance of the sheet original will be described. First, a document set sensor (hereinafter referred to as "D") is provided near the paper feed port 8a of the first document feeding path R1.
S sensor ”) 43 is provided. When a sheet document is set deep inside the paper feed port 8a, it is detected by the DS sensor 43, and accordingly, the start button 19 and the drive source 4 are detected.
1 is connected to the drive source 41 so that the drive source 41 can be driven. Conversely, when the original is not set, even if the start button 19 is pressed while the circuit is cut off. The drive source 41 does not start, and thus the blank feeding of the document is prevented. Then, along the first document transport path R1, a confluence point P with the second document transport path R2 is formed.
A registration sensor 44 is provided in the vicinity, and a reversal sensor 45 is provided in the vicinity of a branch point S from the third document transport path R3. Each of the sensors 43, 44, and 45 has a light emitting element arranged on one side in its transport path,
The controller 40 shown in FIG. 5 is configured by an optical sensor having a light receiving element arranged on the other side, a limit switch, or the like, and detects when the sheet document passing through the sensor arrangement position starts to pass or when the sheet passes. The control signal (detection signal) is output to.

Further, in addition to the sensors 43, 44, 45, the controller 40 shown in FIG. 5 is also connected to the following control members to control the sheet original conveyance pattern. Reference numeral 37 denotes the above-mentioned first guide member that regulates the conveyance direction of the document, and the controller 40
A control signal (switching signal) is received from the switch to switch the document transport path. That is, in the normal state, the first guide member 37 closes the third document transport path R3 and opens the first document transport path R1. By receiving the control signal (switching signal) from the controller 40, An electric current is applied to the solenoid 47, and an actuator acts to rotate the first guide member 37 slightly upward to close the first document transport path R1 and open the third document transport path R3.

The pickup roller 21 is constructed so as to swing up and down using an actuator such as a solenoid 46, receives a control signal (drive signal) from the controller 40, and a current is passed through the solenoid 46. The actuator acts and the pickup roller 21 rotates downward to press the sheet document. In addition, the drive source 41 of each roller 22, 23, 24, 26, 28, 30 is
Receiving a control signal (driving signal) from the controller 40, each of the rollers 22, 23, 24, 26, 28
・ Drive and stop 30. As the drive source 41, a pulse motor is sequentially applied to the multi-phase winding of the stator, and a step motor or the like in which the rotor rotates by a constant angle is used for each pulse, and the controller 40 performs step control. hand,
The number of rotation steps of the drive source 41 is measured.

The rollers 22, 23, 24, 26, 28
4 is interlocked with the forward / reverse rotation of the drive source 41. However, in the extra roller 30, it is controlled via the forward / reverse rotation switching mechanism 48 shown in FIG. 4 and is interlocked with the switching operation of the first guide member 37. A control signal (switching signal) is output from the controller 40 to the electromagnetic clutch 49 of the forward / reverse rotation switching mechanism 48, and the rotation direction of the extra roller 30 is switched. The forward / reverse rotation switching mechanism 48 is provided between the drive source 41 and the extra roller 30, and is provided between the drive shaft to which the power from the drive source 41 is transmitted and the output shaft for outputting to the extra roller 30. Is a same-direction transmission mechanism that transmits rotation in the same direction as the drive shaft, and the other has a reverse rotation transmission mechanism that reverses and transmits the rotation direction, and is spline-fitted to the drive shaft or the output shaft. The electromagnetic clutch 49 is slidably displaced, the connection with one transmission mechanism is released, the connection is made with the other transmission mechanism, and only one rotation is taken out to the output shaft via the electromagnetic clutch 49. Thus, in conjunction with the switching operation of the first guide member 37, a control signal (switching signal) is output from the controller 40 to the electromagnetic clutch 49 of the forward / reverse rotation switching mechanism 48, and the rotation direction of the extra roller 30 is switched. The configuration of the forward / reverse rotation switching mechanism 48 is not limited to the above description, and in addition, the first guide member 37 may be used.
And the forward / reverse rotation switching mechanism 48 may be shared, that is, a single switching device may operate the first guide member 37 and the forward / reverse rotation switching mechanism 48. In this case, the actuator (electromagnetic clutch 49) of the forward / reverse rotation switching mechanism 48 via the solenoid 47, and the first
The actuator of the guide member 37 is operated together.
With this configuration, the number of parts can be reduced, the cost can be reduced, and the rotation direction of the extra roller 30 is switched at the same time in association with the switching operation of the first guide member 37. It can be conveyed in a desired direction.

Further, as shown in FIG. 4, an electromagnetic clutch 51 is provided between the drive source 41 and the separate roller 22, and receives a control signal (stop command signal) from the controller 40, The electromagnetic clutch 51 is disengaged and the separate roller 22 is stopped. Of course, in addition to the electromagnetic clutch 51, other power connection / disconnection mechanism may be used. A one-way clutch 50 is provided between the drive source 41 and the registration roller 24, and the power is transmitted only when the drive source 41 is rotating in the reverse direction. Further, on the key panel 13 shown in FIG. 1, a function key 18 for setting a reading mode such as conversion of single-sided / double-sided reading, a start button 19 for starting a sheet original reading operation, and a plurality of sheet originals A stop button 16 or the like is arranged to stop the reading operation during the continuous reading of documents, and the function key 18, the start button 19, and the stop button 1 are arranged.
When an operation such as 6 is performed, a control signal is output to the controller 40.

Here, the flow of double-sided reading of a sheet original according to the present invention will be outlined. First, as shown in FIG. 6, in the first process, the sheet original set on the original feeding tray 9 with its front side facing up is the sheet feeding port 8a → nip portion A → merging point P → nip portion B → nip. The first surface of the document, that is, the front surface, is read by being conveyed to the part C → nip part D → branch point S → branch point Q → merging point R → nip part E → sheet discharge port 8c. Next, as shown in FIG.
In the process, the sheet discharge port 8c → nip E → merging point R → branch point Q
→ Confluence point P → Nip part B → Nip part C → Nip part D → Branch point S → Branch point T → Nip part F → Temporary discharge port 8b and the back side, which is the second side of the document, is read. . Then, as shown in FIG. 8, in the third process, the temporary discharge port 8b → nip portion F → branch point T → merging point R → nip portion E.
→ The document is conveyed to the sheet discharge port 8c, turned upside down, and discharged onto the discharge tray 7c with the front side of the document down. Hereinafter, double-sided reading of a sheet original according to the present invention will be described based on the time chart shown in FIG. 9 and the flowcharts shown in FIGS. 10 to 15. Further, it is appropriate to refer to the drawings showing the conveyance patterns of the sheet originals shown in FIGS. 6 to 8 as appropriate.

As shown in FIG. 10, first, the user sets the front side of the sheet original on the original feeding tray 9 and inserts it deep inside the feeding opening 8a (step S1).
The leading edge of the sheet document is detected by the DS sensor 43 (step S2), and the document is thus prepared for taking in.

Next, the user operates the function key 18 of the key panel 13 to select the double-sided reading mode for the original reading surface (step S3), and presses the start button 19 provided on the key panel 13 ( Step S
4), the controller 40 to the pickup roller 21,
A control signal is output to the drive source 41 and the electromagnetic clutch 51 of the separate roller 22, and the pickup roller 21
A positive pulse is applied to the solenoid 46, and the solenoid 46 is momentarily excited. As a result, the pickup roller 21 rotates downward (step S5) and presses the sheet original document, and the position and orientation of the sheet original document are maintained until the end of capturing all the sheet original documents. At the same time, the drive source 41 starts to rotate in the normal direction (step S6),
The electromagnetic clutch 51 of the separate roller 22 is connected (step S7), and the drive rollers 22, 26, 28 start rotating in the forward direction (clockwise in FIG. 6).

The extra roller 30 starts to rotate in the reverse rotation direction (counterclockwise in FIG. 6) via the reverse rotation transmission mechanism of the forward / reverse rotation switching mechanism 48, and the registration roller 2
The rotational power of No. 4 is cut off by the one-way clutch 50 and stopped as it is. In this way, only the uppermost sheet document (first sheet document) is separated by the pickup roller 21, the separate roller 22, the retard roller 23, etc., and is slowly taken in from the paper feed port 8a (step S8).

When the leading edge of the first sheet document is detected by the registration sensor 44 (step S9),
After the leading edge of the sheet document is conveyed from the position of the registration sensor 44 to the position of the nip portion B between the registration roller 24 and the registration follow roller 25 by the step control of the driving source 41, the rotation direction of the driving source 41 is reversed ( Step S10). At this time, the leading edge of the sheet document is in contact with the nip portion B between the registration roller 24 and the registration follow roller 25, and when the drive source 41 starts rotating in the reverse direction, the one-way clutch 50 is connected. The registration roller 24 starts to rotate. Further, the rotation directions of the other rollers 26, 28, 30 are also reversed, that is, the feed rollers 26, 28 rotate in the reverse rotation direction (counterclockwise in FIG. 6), and the reverse rotation transmission mechanism of the forward / reverse rotation switching mechanism 48 operates. The extra roller 30 through which it starts rotating in the forward direction (clockwise in FIG. 6). At this time, a control signal is output to the electromagnetic clutch 51 of the separate roller 22, the electromagnetic clutch 51 is disengaged, the rotation of the separate roller 22 is stopped (step S11), and the sheet original is not continuously taken in. is there.

In this manner, the registration roller 24 and the registration follow roller 25 convey the sheet document while adjusting the skew of the sheet document. In the controller 40, the leading edge of the sheet document is moved from the position of the registration sensor 44 to the platen by the step control of the driving source 41. The number of rotation steps (first rotation angle) of the drive source 41 corresponding to the distance conveyed to the rear end position of the glass 12 is measured, and after reaching the first rotation angle as shown in FIG. 11 (step S12), a control signal is output from the controller 40 to the reading device 6, and first,
Reading of the front surface of the first sheet original is started (step S13).

In this way, the first sheet document is a registration roller 24, a registration follow roller 25, a first feed roller 26, a first slave roller 27, and
When the registration sensor 44 detects that the trailing edge of the first sheet document has been conveyed by the second feed roller 28 and the second slave roller 29 (step S14), the detection signal is sent to the controller. 40, and a control signal is output from the controller 40 to the reading device 6.

Further, after the registration sensor 44 detects the passage of the trailing end of the first sheet document, the controller 40 conveys the trailing end of the sheet document from the registration sensor 44 position to the front end position of the platen glass 12. The number of rotation steps (second rotation angle) of the drive source 41 corresponding to the distance is measured, and after the second rotation angle is reached (step S15), the reading of the front surface of the first sheet original is completed. Yes (step S16).

Then, the first sheet original is the first
The flow advances further to the downstream side of the first document transport path R1 along the guide member 37, pushes up the second guide member 38, and is transported in the direction of the sheet discharge port 8c. Then, the first sheet document is fed out by the extra roller 30 and the first guide roller 31, the leading end thereof is discharged from the sheet discharge port 8c, and the trailing end thereof passes the reversing sensor 45 position (step S17). The detection signal is output from the inversion sensor 45 to the controller 40. From this time, in the controller 40, the number of rotation steps of the drive source 41 (third rotation angle) corresponding to the distance that the end of the sheet document is conveyed from the position of the reversal sensor 45 to the intermediate position between the branch point Q and the confluence point R. ) Is measured and after reaching the third rotation angle (step S18), a control signal is output from the controller 40 to the drive source 41, and the rotation direction of the drive source 41 is reversed (step S19).

At this point, the drive source 41 starts to rotate in the normal direction, whereby the one-way clutch 50 is disengaged,
The registration roller 24 stops. In addition, the other roller 26
The rotation directions of 28 and 30 are reversed, that is, the feed rollers 26 and 28 rotate in the forward direction (clockwise in FIG. 6), and the extra roller 30 via the reverse transmission mechanism of the forward / reverse rotation switching mechanism 48 is Reverse direction (counterclockwise in Figure 6)
Begins to rotate to.

Here, the first sheet original document nipped by the extra roller 30 and the first guide roller 31 is switchback reversed and conveyed in the reverse direction (backward). After the trailing edge Q of the first sheet original has passed the branch point Q, the second guide member 38 returns to its original position due to its own weight, so that the first sheet original does not pass through the second guide. The sheet is fed along the member 38 to the second document feeding path R2.

Then, as shown in FIG. 12, when the leading edge of the first sheet document is detected again by the registration sensor 44 (step S20), the leading edge of the sheet document is set by the step control of the driving source 41. From the position of the registration sensor 44 to the registration roller 24 and the registration follow roller 25
After being conveyed to the position of the nip portion B between and, the rotation direction of the drive source 41 is reversed (step S21). At this time,
The leading edge of the sheet original is in contact with the nip portion B between the registration roller 24 and the registration follow roller 25. When the drive source 41 starts rotating in the reverse direction, the one-way clutch 50 is connected and the registration roller is rotated. Two
4 begins to rotate. In addition, other rollers 26, 28, 30
Also the rotation direction is reversed, that is, the feed roller 26.
28 rotates in the reverse rotation direction (counterclockwise in FIG. 7), and the extra roller 30 via the reverse rotation transmission mechanism of the forward / reverse rotation switching mechanism 48 starts rotating in the forward rotation direction (clockwise in FIG. 7).

At this time, the control signal is output from the controller 40 to the first guide member 37,
An electric current is applied to the solenoid 47 of the guide member 37. As a result, the solenoid 47 is excited to rotate the first guide member 37 slightly upward (step S22).

In this way, the first document transport path R1 is closed and the third document transport path R3 is opened. By switching the first guide member 37, a control signal is output to the forward / reverse rotation switching mechanism 48 and the electromagnetic clutch 49 is switched. Then, the power from the drive source 41 is transmitted this time through the same-direction transmission mechanism of the forward / reverse rotation switching mechanism 48, and the extra roller 30 immediately starts rotating in the reverse rotation direction (counterclockwise direction in FIG. 7) ( Step S23). Incidentally, the above-mentioned first guide member 3
7 and the normal / reverse rotation switching mechanism 48 share the switching device, the operations of steps S22 and S23 occur at the same time, and the solenoid 47 is excited, so that the first guide member 37 and the forward / reverse direction are reversed. The rotation switching mechanism 48 is switched.

In this manner, the skew of the sheet original is conveyed by the registration roller 24 and the registration follow roller 25 while being adjusted. In the controller 40, the leading edge of the sheet original is moved from the position of the registration sensor 44 to the platen by the step control of the driving source 41. The number of rotation steps (first rotation angle) of the drive source 41 corresponding to the distance conveyed to the rear end position of the glass 12 is measured, and after reaching the first rotation angle (step S24), the controller 40 A control signal is output to the reading device 6 to start reading the back surface of the first sheet document (step S25).

In this way, the first sheet document is a registration roller 24, a registration follow roller 25, a first feed roller 26, a first slave roller 27, and
When the registration sensor 44 detects that the trailing end of the first sheet document has been conveyed by the second feed roller 28 and the second slave roller 29 (step S26), the detection signal is sent to the controller. 40, and a control signal is output from the controller 40 to the reading device 6.

After the registration sensor 44 detects the passage of the trailing end of the first sheet document, the controller 40 conveys the trailing end of the sheet document from the registration sensor 44 position to the front end position of the platen glass 12. The number of rotation steps of the drive source 41 corresponding to the distance (second
Is measured and the second rotation angle is reached (step S27), the reading of the back surface of the first sheet original is finished (step S28).

Then, the first sheet original is the first original.
The sheet is fed to the third document feeding path R1 along the guide member 37, and then the third guide member 39 is pushed up and fed to the temporary discharge port 8b direction. Then, as shown in FIG. 13, the first sheet document is fed out by the extra roller 30 and the second guide roller 32, and the end thereof is discharged from the temporary discharge port 8b and the end thereof is at the reversing sensor 45 position. After passing (step S29), the detection signal is output from the inversion sensor 45 to the controller 40. From this time, in the controller 40, the number of rotation steps of the drive source 41 (the fourth rotation angle) corresponding to the distance at which the trailing edge of the sheet document is conveyed from the position of the reversal sensor 45 to the intermediate position between the branch point T and the nip portion F. Is measured and the fourth
When the next sheet original (the second sheet original) is present at the paper feed port 8a by the DS sensor 43 after the rotation angle of the above (step S30) (step S31), the controller 40 drives the drive source. A control signal is output to 41 and the electromagnetic clutch 51 of the separate roller 22. As a result, the drive source 41 starts to rotate in the normal direction (step S32), and the electromagnetic clutch 51 of the separate roller 22 is connected (step S33), so that each drive roller 2
2.26.28.30 is the forward rotation direction (clockwise in FIG. 6)
Begins to rotate to. The rotational power of the registration roller 24 is cut off by the one-way clutch 50, and the registration roller 24 stops there.

In this way, the next sheet original is separated by the pickup roller 21, the separate roller 22, the retard roller 23, etc., and is slowly taken in from the paper feed port 8a (step S34).

Then, when the leading edge of the next sheet original is detected by the registration sensor 44 (step S35), the leading edge of the sheet original is moved from the position of the registration sensor 44 to the registration roller 24 by the step control of the driving source 41. After being conveyed to the position of the nip portion B with the follower roller 25, the rotation direction of the drive source 41 is reversed as shown in FIG. 14 (step S36). At this time, the leading edge of the sheet document is in contact with the nip portion B between the registration roller 24 and the registration follow roller 25, and when the drive source 41 starts rotating in the reverse direction, the one-way clutch 50 is connected. The registration roller 24 starts to rotate. Further, the rotation directions of the other rollers 26, 28, 30 are also reversed, that is, the feed rollers 26, 28 rotate in the reverse rotation direction (counterclockwise in FIG. 6), and the reverse rotation transmission mechanism of the forward / reverse rotation switching mechanism 48 operates. Extra roller 30 through
Starts to rotate in the forward direction (clockwise in FIG. 6).

At this time, the separate roller 22,
A control signal is output to the first guide member 37, the electromagnetic clutch 51 of the separate roller 22 is disengaged, and the rotation of the separate roller 22 is stopped (step S37).
The current flowing through the solenoid 47 of the first guide member 37 is cut off, and the first guide member 37 is returned to its original position (step S38). Here, the first guide member 37 closes the third document transport path R3 to open the first document transport path R1, and by this switching, a control signal is output to the forward / reverse rotation switching mechanism 48, and the electromagnetic clutch 49 is switched. The power from the drive source 41 is transmitted via the reverse rotation transmission mechanism of the forward / reverse rotation switching mechanism 48, and the extra roller 30 immediately reverses in the forward rotation direction (clockwise in FIG. 6) and starts rotating ( Step S39).

In this way, the next sheet original is conveyed while the skew of the sheet original is adjusted by the registration roller 24 and the registration follow roller 25, and the controller 40
Then, the leading edge of the sheet original is moved from the position of the registration sensor 44 to the platen glass 1 by the step control of the driving source 41.
2 The number of rotation steps (first rotation angle) of the drive source 41 corresponding to the distance conveyed to the rear end position is measured, and the first
After the rotation angle is reached (step S40), a control signal is output from the controller 40 to the reading device 6, and the reading of the front surface of the next sheet original is started (step S41).

In this way, the next sheet document is registered with the registration roller 24, the registration follow roller 25, the first feed roller 26, the first slave roller 27, and the second sheet.
The sheet is conveyed by the feed roller 28 and the second slave roller 29, and when the registration sensor 44 detects that the trailing edge of the next sheet document has finished passing (step S
42), the detection signal is output to the controller 40,
A control signal is output from the controller 40 to the reading device 6.

Further, since the registration sensor 44 detects the passage of the trailing end of the next sheet document, the controller 40 conveys the trailing end of the sheet document from the position of the registration sensor 44 to the front end of the platen glass 12. The number of rotation steps (second rotation angle) of the drive source 41 corresponding to the distance is measured, and after the second rotation angle is reached (step S43), reading of the next sheet original surface is completed (step S44). ). Then, the next sheet original is conveyed by the second feed roller 28 and the second slave roller 29, further advances to the downstream side of the first original conveying path R1 along the first guide member 37, and then the second sheet original is conveyed. The guide member 38 is pushed up and conveyed in the direction of the sheet discharge port 8c.

At the same time when the next sheet original is taken in at step S35, the first sheet original nipped by the extra roller 30 and the second guide roller 32 is switched back and reversed (in the reverse direction). Go back). The third guide member 39 is returned to its original position by its own weight when the trailing end of the first sheet document passes the branch point T toward the temporary discharge port 8b. Therefore, the first sheet document is guided along the third guide member 39 to the fourth document transport path R4 this time.

Then, the first sheet document is fed out from the sheet discharge port 8c by the extra roller 30 and the first press roller 31, and the document tray faces down.
It is discharged to c (step S45).

The state at this time will be described in detail. At this time, the next sheet original is also conveyed along the first original conveying path R1 according to the flow of steps S34 to S44. The next sheet original catches up while the paper is being ejected. Therefore, when it is fed by the extra roller 30 and the first press roller 31, the end side of the first sheet document and the leading side of the next sheet document overlap each other, and the first sheet document is discharged. After that, the next sheet document is switched back and inverted. By controlling in this way, when reading both sides of a plurality of sheet originals, the reading time can be shortened and the working efficiency is improved. After that, the next sheet original is returned to the step S17 and is conveyed in the same manner as the first sheet original, and the reading process is performed.

In this way, the sheet originals are read one after another, but when the reading of both sides of the last sheet original is completed, there is no next sheet original, so the DS sensor 43 is turned off, and No is returned in step S31. Selected, in this case the controller 40 to drive source 41
The control signal is output to. (Precisely, as shown in FIG. 9, the DS sensor 43 is accurately operated when the last sheet document (here, the second sheet document) has been taken in.
Is turned off. After that, a control signal is output from the controller 40 to the pickup roller 21, and a negative pulse is applied to the solenoid 46 of the pickup roller 21. This momentarily energizes the solenoid 46,
The pickup roller 21 rotates upward and returns to its original position. As shown in FIG. 15, the drive source 41 starts to rotate in the forward direction (step S46), and the last sheet original nipped by the extra roller 30 and the second guide roller 32 is switched back. And proceed in the opposite direction (backward).

At this time, since the third guide member 39 is returned to its original position by its own weight, the last sheet document is fed along the third guide member 39 to the fourth document feed path R4.
Will be guided to. Then, the last sheet document is fed out from the sheet discharge port 8c by the extra roller 30 and the first press roller 31, and is discharged to the discharge tray 7c (step S47).

In the controller 40, the step of rotating the drive source 41 from when the drive source 41 reverses the rotation direction in step S47 to when the last sheet document is completely discharged through the fourth document transport path R4. The number (fifth rotation angle) is measured, and when the fifth rotation angle is reached (step S48), a control signal is output to the first guide member 37 and the drive source 41.

The control signal cuts off the current flowing through the solenoid 47 of the first guide member 37 to close the third document transport path R3, which is the original position of the first guide member 37, and open the first document transport path R1. To the normal state (step S49), and by this switching, the forward / reverse rotation switching mechanism 4
A control signal is output to 8 and the electromagnetic clutch 49 is connected to the reverse transmission mechanism of the forward / reverse rotation switching mechanism 48 (step S50). That is, by this operation, the forward / reverse rotation switching mechanism 48 is returned to the initial state at the time of starting the document taking. Finally, the drive source 41 is stopped upon receiving the control signal (step S51). In this way, reading from the first sheet document to the last sheet document is performed,
A series of operations is completed. It should be noted that in the time chart shown in FIG. 9, the number of originals read is two for the sake of convenience in terms of space, and the second sheet original corresponds to the last sheet original here.

By thus constructing the document transport path, the platen glass 12 at the reading position of the sheet document is read.
The upper passage is required only twice when reading the front side and the back side of the original, so that the next sheet original can be immediately taken into the first original conveying path R1 during the discharging process after reading both sides of the original, improving the original reading speed. Can be achieved.

Further, the sheet original before being discharged after double-sided reading does not pass through the reading position, the fourth original feeding path R
The sheet original is fed by the extra roller 30 and the second press roller 32 while being ejected by the extra roller 30 and the first press roller 31. Three
1 or the rollers 30 and 32 can be stably conveyed without being separated from each other, whereby the control configuration of the apparatus can be simplified. Further, since the discharged sheet originals are stacked on the discharge tray 7c in the order of the original pages through the fourth original conveying path R4, it is possible to save the trouble of rearranging the originals and improve the working efficiency.

[0068]

Since the present invention is configured as described above, it has the following effects. That is, claim 1
The document reading device that scans both the front and back
And eject the scanned document to the bottom of the paper feed slot.
A paper output port, and the second side is read at the bottom of the paper output port.
Place a temporary outlet that reverses the front and back of
The paper exit is switched back after reading the first side.
It also serves as a temporary outlet when the originals are
The first original transport path that scans the first side and guides it to the paper exit
Is curved from the paper feed port to the curved path and extends to the circular path.
An inclined road that is installed and connected to the inclined road toward the paper exit
Consists of a horizontal path, and the connecting position of the ramp and the horizontal path
Is provided with a branch point Q, and from the branch point Q to the first document transport path.
Switch the document back to the arc path and read the second side.
Extends the second document transport path that guides you to the temporary collection discharge port
Then, at the point where the arcuate path shifts to the slope, the branch point S
And a third document from the branch point S toward the temporary discharge port.
The transfer route is extended to an intermediate position between the branch point S and the temporary discharge port.
From the stand to the upper horizontal path with a "U" shape lying in side view
By forming the fourth document transport path in the shape of a letter, the document needs to pass through the reading section only twice when reading the first side and the second side of the document, and therefore the next document is immediately discharged in the discharging process after both sides of the document are read. The original can be taken into the reading unit, and the original reading speed can be improved. In addition, the original document after double-sided scanning is discharged through the inversion path that does not pass through the reading unit, but the discharge roller serving as a discharging unit is separated to send the document from the second transport path side to the first transport path side. It is not necessary to do so, and the control configuration can be simplified. Further, since the discharged originals are stacked on the discharge tray in the order of the original pages through the inversion path, it is possible to save the trouble of rearranging the originals and improve the work efficiency.

Then, in the double-sided document reading apparatus according to a second aspect of the present invention, the double-sided document reading device is controlled to start reading the first side of the next document while the preceding document is being discharged. When both sides of the document are read, the operation time can be shortened and the reading processing efficiency can be improved.

[0070] Furthermore, as according to claim 3, specifically, before
A drive / driven roller that constitutes the discharge means of the paper discharge port,
A drive / driven roller that constitutes the discharge means of the temporary discharge port
Drive rollers are shared and the upper and lower driven rollers are respectively driven.
Roller sliding contact, and thus the paper exit and temporary ejection
By configuring the mouth with three rollers, it is possible to reduce the number of parts and lead to cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view of a facsimile that employs a double-sided original reading device.

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

FIG. 3 is a side sectional view of an ADF of the double-sided document reading device.

FIG. 4 is an explanatory diagram showing a power transmission configuration to each drive roller related to document transportation.

FIG. 5 is a block diagram showing a control configuration of a double-sided document reading device.

FIG. 6 is a side sectional view of the ADF showing the flow of a document in the first process of the double-sided document reading device.

FIG. 7 is a side sectional view of the ADF similarly showing the flow of the original document in the second process.

FIG. 8 is a side sectional view of the ADF similarly showing the flow of the original document in the third process.

FIG. 9 is a time chart diagram of the control configuration of the double-sided document reading device.

FIG. 10 is a flowchart showing the first stage of the control configuration of the double-sided document reading device.

FIG. 11 is a flow chart showing the second stage of the same.

FIG. 12 is a flow chart showing a third step of the same.

FIG. 13 is a flowchart similarly showing the fourth step.

FIG. 14 is a flowchart similarly showing the fifth step.

FIG. 15 is a flow chart showing the final step of the same.

[Explanation of symbols]

8 ADF 8a Paper feed port 8b Temporary discharge port 8c Paper exit 21 Pickup roller 22 Separate roller 30 Extra Roller 31 First Press Roller 32 Second press roller 40 controller 41 Drive source R1 First original feeding path R2 Second document transport path R3 Third document transport path R4 4th original transport path

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI G03G 15/00 106 G03G 15/00 106 107 107 107 H04N 1/04 H04N 1/12 Z (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 1/00-1/00 108 H04N 1/04-1/207

Claims (3)

(57) [Claims] 1. A document reading device for reading both front and back sides of a document.
At the bottom of the
Place the paper exit to be ejected, and read the second surface on the bottom of the exit.
Temporary discharge port that reverses the front and back of the original after picking
Switch the paper output port back after reading the first side.
It also serves as a temporary discharge port when turning over, and guides the first side of the original from the paper feed port to the reading and discharge port.
The first document feeding path is a circular arc path curved from the paper feed port.
And a ramp extending in an arcuate path and connected to the ramp
And a branch point Q is provided at the connecting position of the inclined path and the horizontal path.
From the point Q to the arcuate path of the first document transport path, scan the document.
Switch back and read the second side and guide to the temporary discharge port
The second document transport path is extended and the arcuate path is inclined.
A branch point S is provided at a point where the road is moved to, and
A third document transport path is extended toward the temporary discharge port, and a horizontal position is provided above the intermediate position between the branch point S and the temporary discharge port.
To the path, the 4th original document conveyance path with a side view "U"
A double-sided document reading device having a path formed therein . 2. A double-sided document reading apparatus according to claim 1, wherein the double-sided document reading apparatus is controlled so as to start reading the first side of the next original while the preceding original is being discharged. 3. The double-sided original according to claim 1 or 2.
In the draft reading device, the paper discharge port and the temporary discharge port are
A double-sided document reading device characterized by being composed of two rollers.