JPH0367932B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sheet document conveying device that feeds a sheet document to a predetermined position and then discharges the sheet document from the predetermined position.

Conventionally, this type of device has been installed in image processing devices such as copying machines and facsimile machines, and has achieved faster and more efficient image processing.

For example, automatic sheet document transport devices used in copying machines feed sheet documents stacked on a support stand to a predetermined exposure position, and then transport the exposed sheet documents in the same direction as the feeding direction. The paper is discharged to a discharge tray provided on the opposite side of the support base, and the transport path is formed in a substantially closed loop from the support base, through the exposure position, and back to the support member.

However, if the document is simply ejected to the output tray, the order of the ejected documents may be reversed, and when the document is to be conveyed again, the document must be manually placed from the output tray to the support member. There are drawbacks such as having to redo it.

In addition, with a structure equipped with a closed-loop transport path, the originals that return to the support stand are carried in from the opposite direction to the feed exit of the support stand, so if the original sizes are different, the leading edge of all originals will be may not be aligned with the feed outlet of the output tray. Furthermore, due to the closed loop configuration, there are also disadvantages such as the need to distribute the driving parts of the conveyance system throughout the apparatus.

Another drawback is that it takes time to eject the original at the exposure position and set the next original at the exposure position.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel automatic sheet document conveying device that solves the drawbacks of the conventional example described above.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the automatic sheet document conveying apparatus according to the present invention is used in a copying machine will be described below.
It should be noted that the present invention can be used not only for copying machines but also for devices such as facsimile machines.

FIG. 1 is an external perspective view of an embodiment of an automatic sheet document conveying apparatus according to the present invention installed in a copying machine. C is the main body of the copying machine, and A is an automatic sheet document conveying device mounted on the exposure platen of the copying machine C. Reference numeral 1 denotes a feeding tray on which originals are loaded and set, and can support one or more sheet originals.
They are arranged to be inclined downward in the direction of document feeding so that the document feeding side becomes lower.
Reference numerals 3 and 5 denote a feeding belt and a separation belt, respectively, for separating and feeding a plurality of sheet originals stacked on the feeding tray 1 one by one from the bottom side. Also,
Reference numerals 23 and 24 are operation panels through which the user inputs operation commands to the copying machine main body and the sheet document automatic conveyance device, respectively.

FIG. 2 is a sectional view of a portion of the automatic sheet document conveying device A and the copying machine C shown in FIG. In the figure,
1, 3, and 5 are feeding trays, respectively, as in Fig. 1;
They are a feeding belt and a separation belt. P is a sheet original stacked on the feed tray 1 with the image side facing upward.

Feed rollers 2 and 2a rotate the feed belt 3 in the direction of arrow E to feed the original. 4,4 more
A separating roller a rotates the separating belt 5 in the direction of arrow F and separates the documents one by one between it and the feeding belt 3. The feed belt 3 and the separation belt 5 constitute a separation supply section S. And this separation supply section S
is provided near the bottom of the document on the tray 1, which is tilted downward.

The first sheet path 6 is formed between the guides 7 and 8 and is a path for moving the original separated between the feeding belt 3 and separation belt 5 onto the original platen glass 9. Further, the second sheet path 10 is formed between the guides 11 and 12, and is a path for moving the document after image exposure by the illumination lamp L from the platen glass 9 to the feeding tray 1. Here, the second sheet path 10 is provided facing the first sheet path 6,
It extends from the end 9a of the platen glass 9 to the upper side of the separation belt 5 through the outside of the sheet path 6 (that is, the path away from the belt 18). and,
Upper end 1 of separation belt 5 of this sheet path 10
Ejection rollers 22, 22a are attached to 0a. The originals discharged from above the platen glass 9 are guided by the sheet path 10, and are fed by the feed belt 3 and the separation belt 5 to the direction (alpha direction in the figure) in which the stacked originals are sent out (the downstream side in the α direction). ) and is discharged onto the tray 1 in the opposite direction (β direction in the figure). That is, tray 1
The direction in which the document is sent out from the tray 1 and the direction in which the document is discharged to the tray 1 are opposite directions.

Reference numerals 13, 13a and 15, 15a are sheet feed roller pairs, each of which rotates in the direction of the arrow in the figure. roller 1
The document passing through the sheet path 6 between 3 and 13a is conveyed toward the platen glass 9, and
The document passing through the sheet path 10 between a and 1 is fed toward the feed tray 1. 16 is a deflection plate, and guide 1
2 so that its leading edge is in contact with the guide 7, and the leading edge of the document that has passed through the sheet path 6 is pushed aside and passes through the guide 7, and the document that is moved from the platen glass 9 to the sheet path 10 is attached to this guide. Since the tip of the deflection plate 16 is pressed by the guide 7, it can be moved smoothly. Note that this deflection plate 16 is made of a sheet-like material such as mimer.

Document conveyance rollers 17 and 17a rotate the document conveyance belt 18 and convey the document on the platen glass 9. Note that this roller 17 rotates in the direction of arrow C when conveying the original onto the platen glass 9 and setting it in a predetermined position, and rotates in the direction of arrow D when removing the original from the platen glass 9 after image exposure is completed. It is configured so that the direction of rotation can be changed. Further, reference numerals 19, 20, and 21 are belt press rollers that press the belt 18 against the glass 9 and press the belt 18 against the glass 9.
8 to ensure the conveyance of the original.

22, 22a are discharge rollers, and sheet path 10
The document passing through is kicked out onto the feed tray 1. A clock plate (not shown) rotates in synchronization with the conveyance roller 17, and the belt 1 is rotated by detecting the slits in the clock plate with a photo interrupter.
A clock pulse is formed according to the amount of movement of 8.

Each of S1 to S6 is a sensor for detecting a document, and S1 detects whether or not a document is placed on the feeding tray 1, and is a document sensor consisting of a lamp S1' and a phototransistor S1. S2 is a registration sensor that detects the presence of a document in the sheet path 6, and is a reflective sensor consisting of an LED and a phototransistor.

S3 is a first discharge sensor that detects the presence of a document in the sheet path 10, S4 is a platen sensor that detects a document on platen glass 9, and S5 is a sensor that detects that the document is discharged from platen glass 9 in the right direction in the figure. This is the second discharge sensor. sensor S3,
Both S4 and S5 have the same structure as the registration sensor S2.

S6 is a partition sensor that detects the position of a partition lever (not shown) placed on top of a set of documents;
A hole that detects the magnet attached to the partition lever
Consists of IC.

The upper lid of the separation supply section S can be opened and closed freely.
This facilitates processing such as paper removal when a document is jammed in the device.

FIG. 3 shows an operation panel 24 provided on the front side of the automatic sheet document conveying device A. As shown in FIG. Reference numeral 31 denotes a mode switch for instructing the sheet document automatic conveyance device A to carry out document conveyance. Further, 32 has an RDF mode in which the copying operation is sequentially performed once for each document fed one after another, and the feeding operation is repeated for a specified number of copies, and
Continuously perform copying operations for a specified number of sheets, and when the continuous copying is completed, feed the next document and perform the continuous copying operation again. repeat a number of times
This is a select switch that selects between ADF mode and ADF mode.

33, 34, and 35 are indicators made of LEDs, and the indicator 33 lights up when the ADF mode is selected, and the indicator 34 lights up when the RDF mode is selected. Further, the display 35 lights up when a document is jammed in the sheet document automatic conveyance device A.

FIG. 4 shows an operation panel 23 provided on the main body C of the copying machine. Reference numeral 41 indicates a jam lamp indicating that a jam has occurred within the copying machine main body, 42 a paper out lamp indicating that copy paper has run out, and 43 a toner out lamp indicating that the developer has run out. Numeral display 44 displays the numerical value input from numerical input key 45. 46 is an OK lamp indicating that the apparatus is ready for operation, and 47 is a copy button for instructing the start of a copying operation. Note that the numerical display 44 may be provided on the sheet document automatic conveyance device side.

FIG. 5 is a block diagram of an electric circuit for controlling the operation of the automatic sheet document conveying apparatus A shown in FIG.

Q1 is a control section of the main body of the copying machine including a well-known microcomputer. Q2 is a control unit consisting of a microcomputer that controls the automatic document feeder, and includes ROM, RAM, ALU, and I/O.
This is a well-known LSI that includes O-latches and the like. IRPT is an interrupt terminal of microcomputer Q2.
AI ₀ , AI ₁ , AI ₂ , AI ₃ , BI ₀ , BI ₁ , BI ₂ , BI ₃ ,
CI ₀ , CI ₁ , CI ₂ are input ports. Also AO ₀ ,
AO ₁ , AO ₂ , AO ₃ , BO ₀ , BO ₁ , BO ₂ , BO ₃ ,
CO ₀ , CO ₁ , CO ₂ , CO ₃ , DO ₀ , DO ₁ , EO ₀ ,
EO ₁ , EO ₂ , EO ₃ are output ports.

The control unit Q2 outputs a control signal to the output port in accordance with the input signal to the input port, and controls the operation of each part.

CK is a clock pulse detection sensor that detects a slit in the clock plate which rotates in synchronization with the aforementioned conveyance roller 17, and uses, for example, a photointerrupter consisting of an LED and a phototransistor.

S1 to S3, S5, and S6 are the original document detection sensors described above. DSW is an open/close switch that detects the open/close state of the upper cover of the separation supply section S.

Q3A, Q3B...Q3H are transistor arrays made up of transistors and the like.

M is a DC motor that drives the rollers of this device. CL1 is an electric clutch for transmitting the rotational force of the motor M to drive the rollers 2 and 4 in the direction of the arrow in the figure.

CL2 is an electric clutch for transmitting the rotational force of the motor M to drive the roller 17, and when the clutch CL2 is energized, the roller 17 rotates in the direction C in the figure.

Similarly, CL3 is a clutch for rotating the roller 17 in the opposite direction to that described above, and the clutch CL3 is shown in the figure.
When energized, the roller 17 rotates in the D direction. Note that the roller 13 rotates in the direction of the arrow shown when the clutches CL2 and CL3 are energized.

BK is for accurately stopping the roller 17 using an electric brake.

SW1 is a mode switch 31 operated by the user when using this device. SW2 is a select switch 32 for selecting the above-mentioned ADF or RDF.

PL1 is an indicator that lights up when in ADF mode. Go to PL2
This is an indicator that lights up in RDF mode. PL3 is an indicator that lights up when the original is jammed.

The input ports CI ₀ , CI ₁ , and CI ₂ input signals from the control unit Q1 of the copying machine main body, and the output ports
CO ₀ , CO ₁ , CO ₂ , CO ₃ , DO ₀ , DO ₁ , EO ₀ ,
EO ₁ , EO ₂ , and EO ₃ output control signals to the control section Q1.

FIG. 6 is a timing chart showing how signals are exchanged between the control unit Q1 of the copying machine main body and the control unit Q2 of the automatic sheet document feeder. Give an example.

When the power is turned on at time T ₀ , the copying machine main body C becomes ready for operation after a certain period of time.

Also, when the power is turned on, automatic sheet document feeder A sends a MODE signal (3) from output port CO ₀ to the copying machine.
At the same time as the R/A mode signal (4), a signal indicating whether the mode is 1 copy per original (hereinafter referred to as RDF) mode or 1 copy per original (hereinafter referred to as ADF) mode is issued. is sent from output port CO ₁ . Note that "1" indicates RDF mode and "0" indicates ADF mode. FIG. 6 is a diagram in the case of RDF mode. Furthermore, the MODE signal (3) is output when the mode of the automatic sheet document conveying device is selected and a document is placed on the feeding tray 1. FIG. 6 shows a case where a document is already on the feed tray 1.

Also indicates the separation of the manuscripts when they are placed at the same time.
OEND signal (6) is output from output port DO ₁ . This is a signal indicating the difference between the first document and the final document and is obtained from sensor S6.

FIG. 7 is a flowchart showing an operation control program for the copying machine main body C and the automatic sheet document conveying device A.

The copying operation will be explained below with reference to FIGS. 6 and 7.

As mentioned above, when the power is turned on, the initial set and standby processing are performed, and when the copy button 47 is pressed at time _T1 (step K1), the process proceeds to step K2.
Proceed to. In step K2, it is checked whether the operation mode of the automatic sheet document conveying device is selected, and if so, whether the mode is ADF mode or RDF mode. Then, a process is performed to change the display content of the numerical value inputted from the numerical value input section 45 and displayed on the numerical value display 44. That is, in ADF, it means the normal number of copies, and in RDF mode, since one copy is made for one feeding of the original, it means the number of copies of the original set. In other words, when using ADF, 1 is added for each copying operation, but when using RDF, 1 is added at the end of a series of copying operations.
Addition operation is performed.

When the above processing is completed, the first step is performed in step K3.
Original set request signal for setting the first original
The control unit Q1 sends ORQT(1) to the input port _CI1 .
The automatic sheet document feeder performs the document feeding operation between _T1 and _T2 , and upon completion of the document feeding operation, sends the document feeding completion signal OSET(5) from the output port _CO2 to the copying machine at time _T2 . Then, proceed to step K4.

In step K4, the copying machine performs a well-known copying operation, and when the optical system completes exposure, the process proceeds to step K5 or K.
Proceed to step 6. Here, depending on whether the mode is RDF mode or ADF mode, the process proceeds to steps K5 and K6, respectively.

In RDF mode, it is determined whether the copy counter CNT is incremented by +1 depending on whether the OEND signal (6) is output. And OEND
If there is, it will be added; if there is not, it will do nothing.
Then, in step K7, it is checked whether or not a predetermined number of copies have been completed. If the predetermined number of copies has not been reached, in step K8, an ORQT signal (1) and an OEXT signal (2) are sent to the sheet document automatic conveyance device at time _T3 . If it has been reached, proceed to step K9. ORQT(1) and
The automatic sheet document feeder that receives the OEXT signal (2) then processes the document feed and eject, and
Output OSET signal (5) at T ₄ . This causes the process to proceed to the copying operation of the next second document. Between T ₄ and T ₅ , the second copy is completed in the same way as described above, and since the set number of copies has not yet been completed, at time T ₅ the same ORQT signal ( ₁ ) and OEXT signal ( 2) shows the time
The second document is ejected and the third document is fed between _T5 and ^T6 , and an OSET signal ( ₅ ) is output at time T6. time
The copying operation for the third sheet is performed from _T6 , and at time _T7 , a signal similar to that at time _T3 is outputted, and the third sheet of original is ejected and the first sheet of original is fed. this time
At _T7 , the original delimiter signal OEND signal (6) is sent to the main body. As a result, the number of copies displayed changes from 0 to 1 (that is, one copy is completed) as explained in step K5. The above operations are repeated until the copy counter reaches the set number of copies N, and the process ends. In FIG. 6, the OEXT signal (2) is output at time T _N , and the automatic sheet document conveying device performs a discharge operation, and all operations are completed. In FIG. 7, as shown in step K9, the OEXT signal (2) is output, a flag (not shown) indicating the completion of copying is set, post-copying processing is performed, and the process returns to step K1.

Next, in the case of the ADF mode, the timing chart is almost the same as the timing chart shown at times T ₀ to T ₇ in FIG. 6 described above. The difference is that between T ₂ and _{T 3} , N copies are made for one document instead of one copy.
The operation from time T ₃ to time _{T 4} is performed after copying the sheet.
Similarly, the same applies to times T ₄ to T ₅ and T ₆ to _{T 7} .

In FIG. 7, at step K6, as shown in the flowchart, a counter is first incremented for each copy, the value is displayed, and it is checked whether the set number of copies has been reached. If the set number of sheets has not been reached, step K4 is repeated. If it has been reached, proceed to step K10 and check the OEND signal (6).
If OEND is not output, OEXT signal 2 and ORQT signal 1 are output, and a signal for exchanging the original is output. Then, upon input of the OSET signal (5), copying of the next original is started. If the OEND signal (6) is input, the process proceeds to step 9 and performs the same operation as in the RDF mode described above.

FIG. 8 is a timing chart showing the operation of the input/output load of the automatic sheet document conveying device A. 9th
10A and 10B are flowcharts showing the operation control program.

The operation will be explained mainly using a flowchart.

When a power switch (not shown) is turned on and power is supplied, all circuits within the automatic sheet document conveying apparatus enter the operating state. Then the microcomputer program starts. Step K11
The RAM and I/O ports are reset. In step K12, the input port _BI1 is read to see if the top cover of the separation supply section S is closed, and if it is closed, the process advances to step K13. If it is open, it waits in step K12 until it is closed.

At step K13, check input port BI ₂ and if mode switch 31 is pressed, step K14
Then, the input port BI ₃ determines whether the mode selected by the select key 32 is the RDF mode or the ADF mode. Then, in step K15, if the RDF mode is selected, output port BO ₂ and transistor array Q
PL2 is turned ON through 3H, and the RDF display 34 is lit. Also, in ADF mode, the output port
BO ₁ , PL1 through transistor array Q3G
Turn on and the ADF display 33 lights up. Then, the process advances to step K16.

In step K16, if the sensor S1 does not detect whether or not there is a document on the paper feed tray 1, the process returns to step K12. Output signal port CO ₀
Send more. At the same time, the R/A mode signal is sent to inform whether to operate in RDF mode or ADF mode.
Send from CO ₁ port. As mentioned above, ADF with “0”
Mode, “1” sets RDF mode.

In step K18, an original request ORQT signal, which is a command to send and set an original, is awaited from the copying machine control circuit Q1. When this signal arrives, the ADF mode subroutine operates the automatic sheet document feeder.
Subroutine subRDF for subADF or RDF mode
Run the program. After executing the subroutine, the process returns to step K12 and repeats in the above order.

Subroutine according to Figures 10A and 10B
Explain subRDF. The subroutine subRDF is entered, and in step K20 it is checked whether the original is to be fed or ejected. The ORQT signal is a document feed request signal from the copying machine main body. Similarly, the OEXT signal is a document discharge request signal. In this step, it is determined whether to request only document feeding, only document ejection, or simultaneous document feeding and ejecting. Jump to step K21, step K25, and step K28, respectively.

First, the case of paper feeding only will be explained.

At step K21, turn on motor M and turn clutch Cl.
1 to turn on, clutch Cl2 to turn on AO ₀ ~
Set AO ₂ to “H”. This allows the document to be fed from the feed tray 1 and seen to arrive at the leading edge detection sensor S2. Until the document arrives, the jam of the document is checked at step K22 by counting the clock CK. This jam detection counter is assigned the name CNT1 to a RAM (not shown) and counted.
If the count is within the predetermined count N1, it is not a jam; if it exceeds N1, it is treated as a jam and the process proceeds to the jam subroutine subJAM for processing the jam. still,
In the present invention, this process is omitted.

On the other hand, if the document is normally sent to sensor S2, the process advances to step K23. That is, the tip sensor S2
When detects a document, the clutch Cl1 is turned off to stop the feeding belt 3 and separation belt 5. At this time, the original is continuously conveyed in the direction of the platen glass 9 by the roller 13.

CNT2 is a counter for detecting a stuck jam, and CNT5 is a counter for knowing the length of the document in the feeding direction, and these counters are stored in the RAM under the names CNT2 and CNT5, respectively. It performs calculations by counting the number of clocks. When CNT2 becomes larger than a predetermined number N2, it is determined that there is a jam, and the jam processing is performed in the same manner as described above.

Four clock pulses CK are output per 1 mm of the document conveyance distance. Therefore, for example, if you send an A4 size (210 x 297 mm) document horizontally, 210 x 4 =
That's 840 pulses. Using this pulse, if the content of the counter CNT5 is around 840, it can be determined that the original is A4 size. The same information can be found for other sizes as well.

Normally, the document feed direction is, for example, except under certain conditions.
A3 size is defined as vertical, A4 size is horizontal, and A5 size is horizontal, so you can tell by the length in the feeding direction. However, if A4 size is horizontal, then A5
If you send the size vertically, it becomes difficult to tell. Needless to say, such a case can be achieved by detecting the length of the document in the width direction.

After passing through the sensor S2, the process moves to step K24. After the trailing edge of the document passes over sensor S2, when the number of clocks reaches _N0 , turn on motor M and close clutch CL.
2 is turned off, brake BK is turned on, and the original is stopped at the specified position. Now that the document has been fed to the specified position, a set completion signal OSET is sent to the copying machine.
Outputs the signal from output port CO ₂ . At the same time, the original size signal detected in step K23 is outputted from output ports _EO0 to _EO3 and sent to the main body of the copying machine. Based on this signal, the copying machine can also select copy paper according to the original and set the exposure scanning distance.

Next, a case where only the original is ejected will be described. In this case, the process advances from step K20 to step K25.
The output ports AO ₀ and AO ₃ are set to "H", the motor M is turned on, and the clutch Cl3 is turned on to drive the conveyor belt 18 in the direction of arrow D to begin discharging the original. In this case, the sensor S3 performs a jam check in step K26 (using CNT3), and after the original passes through the first ejection sensor S3, the jam is checked in step K2.
At step 7, after the clock N pulse, the motor is turned off and the clutch Cl3 is turned off to complete the process. The N pulse is sufficient time for the document to exit sheet path 10 after passing sensor S3.

Next, the case of document feeding and ejection will be described. In this case, the process advances to step K28. First, output port AO ₀ ,
Set AO ₃ to “H” and rotate motor M to transfer conveyor belt 1.
Turn on clutch Cl3 to reverse rotation. The document on platen glass 9 begins to move toward the left in the figure by belt 18 and is guided to roller 15 . The roller 15 rotates at a peripheral speed twice as fast as the conveyance speed of the belt 18. Further, the discharge roller 22 also rotates at the same speed as the roller 15. Also, belt 18
can be opened to the platen glass 9, the document conveying force of the rollers 15 becomes stronger than the document conveying force of the belt 18, and the document is discharged at a high speed at this point. When the leading edge of the document passes the first discharge sensor S3, the process advances to step K29.

In step 29, in order to feed the next document from the paper feed tray 1, the belt reverse clutch Cl3 is turned off while the motor M is kept on, and the forward rotation clutch Cl2 is turned on to rotate the belt 18 in the forward direction, that is, in the direction of arrow C. Furthermore, in order to rotate the paper feed belt 3 and separation belt 5, the clutch Cl1 is turned on.

Steps K30 and K31 are repeated until the document reaches the registration sensor S2. During this time, a jam in the discharged original is detected in step K31, and a jam in the fed original is detected in step K30. When the document reaches the registration sensor S2, the paper feed belt 3 and separation belt 5 are stopped in step K32, and the process proceeds to step K33.
In step K33, the paper size is detected in the same manner as described above. When the original passes through the registration sensor S2, the process proceeds to step K34.

During this time, if the original is ejected and set at the same time and the ejected original is long, the originals temporarily overlap each other between the belt 18 and the platen glass 9 and move in the opposite direction.
5 and 15a, so there is no problem. When the newly fed original passes through the registration sensor S2, the original to be ejected is already gone on the platen glass 9, so there is no problem in aligning the new original to the predetermined exposure position. .

Step K34 is the same as step K24 described above, which only involves document feeding, and therefore the explanation thereof will be omitted.

In addition, the subroutine subADF in ADF mode
Since this is a well-known technique and is not essential to the present invention, its explanation will be omitted.

In addition, steps K1 and K of the flowchart in Figure 7
4 is mainly for performing sequence control inside the main body of the copying machine. One of the ideas of the present invention, which is to use the numeric display on the copying machine body for RDF mode and ADF mode, may not be applicable to all copying machines.
For example, in a small, low-cost copying machine, it may not be possible to incorporate the above-mentioned display switching program into the copying machine. Furthermore, the number of signal lines between the copying machine and the automatic sheet document conveyance device may be limited. In such a case, as shown in FIG.
1 and a display 11-2 for displaying the number of copies can be newly provided and the number of copies can be displayed using the display.

In this case, fewer signals are required between the copying machine and the automatic sheet document conveyance device. It is easy to understand that this can be achieved by performing the same procedure as shown in the flowchart of FIG. 7 within the document processing apparatus.

FIG. 12 shows an example of a control circuit in that case.

Further, it is also possible to use the numerical display of the automatic sheet document conveyance device to display a plurality of information.

As explained above, according to the present invention, sheet originals are transported quickly by transporting the sheet originals ejected from a predetermined position at a speed faster than the speed at which the sheet originals on the original stacking means are separated and fed. The sheet original can be ejected from a predetermined position, and the next original can be fed to the predetermined position, allowing efficient exchange of sheet originals.

In addition, the automatic document feeder is configured to guide the document from the document stacking section to a predetermined position while reversing the front and back, eject the document from the guided side, and return it to the document stacking section while flipping the document front and back. can be summarized compactly.

Further, since the documents can be stacked with the side to be read facing upward, the documents can be fed while checking the image side of the document, and operability can be improved.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an embodiment of an automatic sheet document conveying device according to the present invention installed in a copying machine;
The figure is a sectional view of the sheet document automatic conveyance device shown in the first figure, FIG. 3 is a front view of the operation panel provided on the front of the sheet document automatic conveyance device, and FIG. 5 is a block diagram of the control circuit of the automatic sheet document feeder, FIG. 6 is a timing chart showing the state of signal transmission and reception between control units Q1 and Q2, and FIG. 7 is a diagram of the copying machine main body and sheets. FIG. 8 is a flowchart diagram showing the operation control program of the automatic document transport device; FIG. 8 is a timing chart diagram showing the operation of the input/output load of the automatic sheet document transport device; FIGS. 9, 10A, and 10.
FIG. B is a flowchart showing the operation control program of the control unit Q2, FIG. 11 is an external view of another embodiment of the present invention, and FIG. 12 is a circuit block diagram of the apparatus shown in FIG. Further, A is a sheet document automatic conveyance device, C is a copying machine main body, 1 is a paper feed tray, 18 is a conveyor belt, 23 and 24 are operation panels, S1 to S5
is the document sensor.

Claims (1)

[Scope of Claims] 1. An automatic document feeding device that transports a sheet original to a predetermined position 9 and then discharges the sheet original from the predetermined position, comprising: an original loading means 1 for stacking the sheet original; and the original loading means feeding means 3 and 5 for separating and feeding the upper sheet original from the lowermost one at a first speed; and a curved first feeding means 3 and 5 for reversing the front and back of the sheet original sent out by the feeding means and guiding it downward. a conveying path 6, a conveying means 18 for conveying the sheet original guided by the reversing means to the predetermined position, and then reversing the conveying direction and ejecting the sheet original from the predetermined position; Therefore, a second conveyance path 10 that reverses the front and back of the sheet document discharged from the predetermined position and guides it to the document stacking means; The sheet original is transported at a second speed faster than the first speed with a transporting force stronger than the transporting force of the sheet original by the transporting means.
An automatic sheet document conveying device comprising: a feeding means 15 for conveying at a speed of .