JPH09281762A - Image forming device provided with automatic document feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the probability of the occurrence of forcedly stopping processing for preventing the coexistence of transfer papers after/before the formation of an image is completed, when a document is jammed at the time of feeding. SOLUTION: This image forming device is provided with an image forming means, a document feeding means, a document exposure control means, a document feeding abnormality detecting means, a forcedly stopping means for the transfer paper and a selection control means for judging whether forced stopping is executed or not, by the presence of the connection of a postprocessing means (sorter), when the carrying of the document is abnormal during the formation of the image. When the sorter is not connected, the sheet is ejected and when the sorter is connected, the carrying of the sheet is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus provided with an automatic document feeder, and more particularly, to a process when a paper jam occurs in an image forming apparatus such as a copying machine, a printer or a facsimile.

[0002]

2. Description of the Related Art Conventionally, when a document feeding abnormality (hereinafter referred to as a document feeding jam) occurs during document feeding by a document feeding device, a corresponding sheet (transfer sheet) is a sheet waiting by a registration roller. Therefore, the paper is discharged as invalid paper to a processing device such as a sorter (not shown). That is, after the preparation of the processing apparatus is completed by the registration roller, the sheet is discharged as a blank sheet.

However, in the feeding mode in which the image is formed by fixing the image exposure means at a predetermined position and moving the document at a predetermined speed by the document feeding device, the sheet (transferring) corresponding to the document feeding jam occurs. paper)
Is already passing through or after passing through the registration roller, and the registration roller unit cannot wait for the preparation of the processing apparatus. That is, there has been a problem that unfinished sheets (transfer paper) are mixed with transfer paper that has already been completed in the processing apparatus.

Therefore, when a document feeding abnormality is detected by the document feeding abnormality detecting means for the purpose of preventing the mixture of the transfer sheet for which the image formation is completed and the transfer sheet for which the image formation is not completed at the time of the document feeding jam. It is conceivable to forcibly stop the transfer paper during image formation.

[0005]

However, if the transfer sheet being image-formed is forcibly stopped in all cases of the document feeding jam in the flow-reading mode, the operator may force the transfer sheet to be stopped. There is a risk that the probability of removal will increase considerably and the operability will decrease.

Therefore, an object of the present invention is to determine the situation in which forced stop is to be made, and to minimize the probability of forcibly stopping the sheet on which an image is being formed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and when an original conveyance abnormality is detected by an original feeding abnormality detection means during image formation, processing is performed. A determination means for determining the type of mode of the means or the presence or absence of connection of the processing means, or a determination means for determining the type of abnormality detected by the document feeding abnormality detection means,
An image forming apparatus including a forced stop control means for forcibly stopping a sheet being image-formed under a predetermined condition, and continuing to discharge the sheet under other conditions.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of an electrophotographic copying machine as an example of an image forming apparatus according to the present invention. The copying machine 1 shown in FIG. 1 includes a circulation type automatic document feeder (hereinafter, referred to as RDF) 2 for automatically feeding a document, and an image forming apparatus main body (hereinafter, simply referred to as an apparatus main body) 3. The RDF 2 can be freely used in combination with the apparatus main body 3.

The apparatus main body 3 is provided with a document table glass 5 as a document placing table on the upper part. Below this, there is an optical system 6 as image reading means.
Is provided with a document illumination lamp (exposure lamp) 6a, a scanning mirror 6b, a zoom lens 6c, and a motor (not shown). The exposure lamp 6a illuminates the document, and the reflected light from the document is scanned by the scanning mirror 6b. The zoom lens 6c irradiates the photosensitive drum 7a. Photoconductor drum 7
There are the following two methods for irradiating a with the reflected light from the document. First, with a document fixed on the platen glass 5, a method of moving the exposure lamp 6a (hereinafter referred to as fixed reading) and a method with the exposure lamp 6a fixed,
There is a method of moving the document on the platen glass 5 (hereinafter, referred to as non-scanning). S1 is a document jam detecting unit, and particularly, it is located downstream of the separating unit and detects a jam at the time of document separation.

An image forming section 7 is disposed below the optical system 6, and the image forming section 7 includes a photosensitive drum 7a rotatably arranged in the direction of an arrow 7R, and the photosensitive drum 7.
A high voltage unit 7b, a blank exposure unit 7c, a potential sensor 7d, a developing device 7e, a transfer charging device 7f, a separation charging device 7g, and a cleaning device 7h, which are sequentially arranged around a in the direction of a. I have it.

The photosensitive drum 7a is rotationally driven by a main motor (not shown), corona-charged by the high-voltage unit 7b, and then reflected light of the original is irradiated from the optical system 6 to form an electrostatic latent image. Is configured. The electrostatic latent image is developed by the developing device 7e and visualized as a toner image.

On the other hand, in the lower part of the apparatus main body 3, there are provided paper feed cassettes 9 of a first-stage cassette 9a, a second-stage cassette 9b, a third-stage cassette 9c and a fourth-stage cassette 9d. Each cassette is also provided with a sheet feeding section, but as an example, the sheet feeding section of the three-stage cassette 9c will be described. The sheet material S is fed to the upper end of the tip of the three-stage cassette 9c. A paper roller 11a and a pickup roller 10a are arranged. Further, on the downstream side, the transport rollers 12a, 12
b, 12c, and 12d are arranged so that the sheet material S is conveyed to the registration roller 13 provided near the image forming unit 7. Further, a multi-bypass tray 14 for conveying the sheet material S to the image forming unit by hand is provided near the image forming unit 7.

Further, downstream of the image forming section 7, there is arranged a conveyor belt 15 for conveying the image-formed sheet material S downstream, and a toner image is formed on the downstream side of the conveyor belt 15 by heating. A fixing device 16 for fixing the sheet material S is provided. In the vicinity of the fixing device 16, there is provided a paper discharge flapper 17 for switching between a path A2 for carrying both sides and multiplex recording and a path A1 for discharging the apparatus main body 3 out of the apparatus. Ejection roller 1 on path A1
9. A discharge tray for storing discharged sheets is provided. A sorter can be connected instead of the discharge tray, but the configuration of the sorter is the same as in FIG. S2 is a connection detection sensor.

Below the fixing device 16, there is provided a conveying path 20 for a sheet material S to be double-sided and for multiple copying. Downstream thereof, a temporary storage tray discharge roller 21 for discharging the sheet material to a temporary storage tray 23. And a discharge sensor 22 for detecting the discharge of the sheet material S. In the vicinity of the discharge sensor 22, there is provided a sheet re-feeding device 34 for temporarily storing the sheet S conveyed after image formation and then re-feeding the sheet S sequentially.

The temporary storage tray 23 has an oblique structure in order to assist in reaching the re-feed / separation belt 33, and a re-feed roller 31 is disposed near the tip thereof, and further downstream thereof. The re-feeding / delivering roller 32 and the re-feeding / separating belt 33 are in contact with each other, and are configured to re-feed the sheet material S one by one. In addition, the re-feeding and sending roller 32
A multiple flapper 36 is disposed in the vicinity of the re-feed / separation belt 33, and a reverse conveying path for reversing the image forming surface of the sheet material S at the time of multiple recording is provided above and below the multiple flapper 36. 37, downwardly conveys a conveying path 39 for conveying the sheet material S to the image forming section 7 and conveying rollers 40a, 40.
b, 40c and 40d are provided respectively.

Further, sensors 50, 51, 52, 53, 54, 55, 56, 57, 5 for detecting the passage of the sheet material S.
8 are provided.

FIG. 2 is a block diagram of the control device 100 of this embodiment. The control device 100 includes a CPU 101 that controls the entire copying machine according to a control procedure stored in a read-only memory (ROM) 102, and a read-only memory (that stores a control procedure (control program) of the control device of the apparatus main body 3 ( ROM) 102, a random access memory (RAM) 103 that is a main storage device used as a storage area for input data and a work storage area, an output of a control signal of the CPU 101 with respect to a load such as a main motor, a sensor, and the like. It comprises an I / O 104 for inputting a signal and sending it to the CPU 101.

FIG. 3 shows an arrangement configuration example of the operation panel 200 provided in the apparatus main body 3 described above.

In FIG. 3, reference numeral 601 denotes a user mode key, which allows an operator (user) to turn on / off automatic sorting.
OFF, ON / OFF for sorter front extraction, ON / OFF for both sides of skip, O for manual feeder automatic start
N / OFF, ON / OFF of automatic selection of cassette, ON / OFF setting of buzzer, slightly small mode change, preheat mode setting, specification setting initialization, standard mode change, auto clear time change, auto power It is used for setting and adjusting off time, setting weekly timer, day / time setting, zoom fine adjustment, feeder cleaning, wire cleaning, etc.

An all reset key 610 is pressed to return to the standard mode.

Reference numeral 605 denotes a copy start key (copy start key), which is pressed to start copying.

A clear key 604 is used to release the set number of copies.

A stop key 609 is pressed to interrupt continuous copying. After the copying at the time when this key is pressed is completed, the copying operation is stopped.

Reference numeral 608 is a ten-key pad which is pressed to set the number of copies.

Reference numeral 602 denotes a guide key, which is used when displaying the explanation of the functions corresponding to various keys on the message display.

Reference numeral 607 denotes a preheat key, which is pressed to enter the preheat mode. This key is a self-illuminated key and lights up in the preheating mode.

An interrupt key 606 is interrupted during the copying operation and pressed when another copying is performed. This key is a self-illuminated key that lights when an interrupt is received,
Lights during interruption.

Reference numeral 615 is an LC for displaying information regarding copying.
This is a message display with a D (liquid crystal) type touch panel, and displays characters and figures in 240 × 320 dots. In the standard state, this message display is used to set the mode for fixed-size variable-size key, same-size key, zoom key, slightly smaller key, paper selection key, copy density key, sorter key for selecting the sorter function, and duplex copy. Double-sided key, other, frame eraser, binding margin,
Cover / sheet, reduced layout, enlarged layout, OHP
Applied mode keys for setting copy modes related to applied copy, such as insertion, page continuous copying, multiplexing, mixed originals, photographs, mode memory, etc. are displayed, and by touching the part corresponding to each key, the contents are furthermore displayed. The window for the file is displayed. In addition to this, an operation procedure when a paper jam or an error occurs is also displayed.

FIG. 4 is an explanatory diagram of the image forming operation by the flow reading.

First, a document is set on the RDF 2 (a),
When the copy start key 605 is turned on, RDF2 becomes 2
The document number is fed from the right, and the apparatus main body 3 moves the optical system 6 to the center of the document table 5 and locks the optical system by an optical system locking means (not shown) (b). The second manuscript is optical system 6
When it is conveyed to immediately before (c), the RDF 2 sends an image destination signal to the apparatus body 3, and the apparatus body 3 turns on the exposure lamp,
The resist is controlled according to the image destination signal (d). At this time, the first document is fed following the second document. Subsequently, the first document is exposed and the second document is discharged from the left (e). Then, the optical system 6 returns to the pole position, and the first document is discharged from the left (f).

FIG. 5 is a perspective view showing a detachable unit and an openable / closable unit of the apparatus body 3. This perspective view shows the LCD on the operation panel 200 when a jam occurs.
Displayed at 615, the processing procedure is instructed.

In FIG. 5, reference numeral 301 denotes a fixing transport unit in which each unit from the registration roller 13 to the discharge roller 19 is integrated, and 302 is a temporary storage tray in which the temporary storage tray 23 and the re-feeding device 34 are integrated. Unit, 30
Reference numeral 3 denotes a re-feeding / conveying unit in which conveyance rollers 40a, 40b, 40c, 40d that convey the sheet material re-fed from the temporary storage tray 23 are integrated, and will be described later.
Each unit is integrated and can be pulled out forward.

Reference numerals 304, 305, 306, and 307 are paper feed cassettes.

Reference numeral 310 is a manual feed cover, 311 is an upper right door, and 312 is a lower right door, which are constructed such that they can be opened and closed with the back side as a fulcrum.

FIG. 6 is a perspective view for instructing opening / closing of the upper right door 311 and FIG. 7 is a perspective view for instructing to pull out the fixing / conveying unit 301.

Next, details of this embodiment will be described.

FIG. 8 is a flow chart of a control task for controlling the paper feeding of the apparatus main body 3.

When the copy start key 605 is turned on, the paper feeding task is activated, and the paper task for controlling the conveyance of the sheet material S is activated (S101), and the paper task position counter indicates the position of the paper feeding cassette position. The counter is set (S102). This position counter takes a negative value on the upstream side (paper feed side) and a positive value on the downstream side (paper discharge side) with the position of the registration roller 13 set to zero, and the encoder clock of the main motor (not shown) or , Counted up by the internal timer clock. In this embodiment,
It is counted up by the encoder clock, but the count value of the paper feed cassette position is set to a value obtained by dividing the actual distance from the paper feed cassette position to the registration roller 13 by the moving distance per pulse of the encoder clock (hereinafter referred to as "counter value"). , The position counter is a value calculated in the same way as the method defined here). Further, it waits until the value obtained by subtracting the position counter value of the paper feed cassette position from the position counter value of the previous paper task becomes larger than the count value corresponding to the paper feed (S103), and the next paper feed request is issued. If there is, the next paper task is started (S101), and if there is no request, it ends.

Next, the operation of the paper task will be described.

FIG. 9 is an operation flow chart of the paper task.

The paper task started by the paper feed task checks whether it passes the next sensor to be passed on the conveyance path (S201). When the paper task passes the sensor, the value of the position counter is checked. The value is corrected to the absolute position counter value of the sensor (S202), and further, the transport roller or the like disposed on the transport path to be driven next is turned on or the transport roller or the like which has already passed is turned off (S203).

Next, it is checked whether or not a jam has occurred (S204). If a jam has occurred, it is calculated which of the units 301 to 312 the current position counter belongs to (S205). ), The current position count value is subtracted from the position counter of a predetermined position that is optimal for stopping in the unit to which the unit belongs (S20).
6) Wait for the count value corresponding to the difference to elapse (S207), and turn off the transporting rollers and the like that are being driven (S208). Further, it is checked whether or not there is a succeeding sheet on the upstream side (S209), and if there is a succeeding sheet, the occurrence of a jam is notified to the succeeding sheet (S210). It is checked whether or not it has passed through the separation charger 7g (S211), and if it has passed, the post-rotation control for high voltage is started (S2).
12) Then, control is transferred to the next task, and the processing ends. This task is activated for a certain period of time or as needed.

Next, the display control displayed on the operation panel 200 when a jam occurs will be described.

FIG. 10 is a control flow chart of the jam display task.

When a jam occurs, the jam display task is activated. First, the number of sheet materials remaining in the apparatus main body 3 is calculated from the number of paper tasks, and the number N of removed sheets is obtained (S301). Then, the number Ui of the stopped unit of each sheet is calculated (S302). This unit number Ui has two numbers, a first unit and a second unit, in case, for example, it is unavoidably stopped between units. For example, for the sheet stopped immediately before the registration roller 13, the processing for the upper right door 311 shown in FIG. 6 is the first unit, and the fixing conveyance unit 301 shown in FIG. 7 is the second unit. That is, the sheet can be easily removed by preferentially processing the first unit.

Next, it is determined whether there is a unit to be removed preferentially. This is because if the paper of the priority unit is not removed first, there is damage to the paper that should be removed, the stop position of the paper that causes the jam cannot be accurately determined, or the paper cannot be stopped between the units. For example, when stopped. First, the primary variable i for counting the number of removed sheets is 1
Is set (S303), it is determined whether the primary variable i reaches the number of removed sheets N (S304), and it is checked whether the unit is a predetermined priority unit (S30).
5) If it is the priority unit, the priority unit presence flag is set (S306), the primary variable i is incremented (S307), and the number of removed sheets is repeated N times.

If the above-mentioned priority unit presence flag is set (S308), a paper removing process described later is executed (S309), and the paper to be removed preferentially is removed.

Next, the remaining paper is similarly removed. First, the primary variable i is set to 1 (S31
0), while determining that the primary variable i reaches the number of removed sheets N (S311), the sheet removing process described later is executed (S31).
2), increment the primary variable i (S313),
The number of removed sheets is repeated N times, and the process is completed.

Next, the paper removing process will be described.

FIG. 11 is a control flow chart of the paper removing process.

First, a display prompting the processing of the first unit number is displayed on the LCD of the operation panel 200 (S40).
1) Wait for the first unit to be detached or opened / closed (S402), and then the sensor in the first unit can detect the sheet, that is, detached / opened / closed. The sensor has detected the paper before,
At the same time, it is checked whether the sensor is turned off by attachment / detachment or opening / closing (S403). If the detection of the sensor is valid and the sensor is OFF, the removal is completed and the processing ends. In other cases, the removal is not completed.
Check if the unit number of is set (S
404), if there is no second unit number, it is determined that the detection of the sensor is valid (S405). If the sensor is not valid, it is determined that the removal is completed. Wait for desorption or opening / closing (S402). If the second unit is set, a display prompting the processing of the second unit number is displayed on the LCD of the operation panel 200 (S406), and the second unit is detached or opened / closed (S407). Or, when it is opened and closed, the sensor in the second unit can detect and the sensor is OF
If it is detectable (S408) and the sensor is OFF, the removal is completed and ends. In other cases, the removal is not completed, and the detection effectiveness of the sensor is determined. (S409), if the sensor is not valid, it is determined that the removal is completed, and if the sensor is valid, the second process is performed again.
Wait for the unit to be removed or opened or closed (S407).

Next, when a jam occurs, the temporary storage tray 23
The process for reusing the remaining paper will be described.

FIG. 12 is a processing flow chart after the jam processing.

First, it is checked whether paper remains in the temporary storage tray 23 (S501), and the temporary storage tray 23 is checked.
If there is no paper remaining in the tray, normal recovery data is calculated (S506). If paper remains, it is checked whether or not the temporary storage tray 32 has been attached / detached after all jam processing is completed (S502). If there is,
The process display of the temporary storage tray 32 is displayed (S503), and the process waits until the temporary storage tray is removed (S504). After the removal, the process display is repeated until there is no more paper in the temporary storage tray (S505). When the paper runs out, the recovery data is calculated (S506),
finish.

Next, the processing of the monitoring unit for monitoring the occurrence of jams, especially the processing when the copy operation is in the flow-reading mode, will be described.

First, an embodiment in which the type of mode of the processing means (post-processing means) or the presence or absence of connection is determined will be described.

FIG. 13 is a jam monitoring flow chart (No. 1).

First, waiting for the copy start key 605 to be pressed (S601), when the copy start key 605 is pressed, it is judged from the original size, the copy magnification, etc. whether or not the flow reading operation is possible (S602). If the flow reading is possible, the flow reading mode flag is set (S60
3) If the flow reading mode flag is set (S
604), monitors the JAM of RDF2 (S605), R
When a JAM of DF2 occurs, a determination control circuit including a switch S2 (not shown) determines whether the processing device is mounted (S606). If the processing device is mounted, the sorting mode is a non-sort without sorting. Whether the mode is the mode is judged by the judgment control circuit including the mode selection button (S
607), in the case other than the non-sort mode (for example, the sort mode), the corresponding paper task during image formation is JA
The occurrence of M is notified (S608), monitoring is continued until the copy is completed (S609), and the process is completed when the copy is completed.

That is, when a jam of the RDF 2 occurs in the flow reading mode, basically, the jam is stopped for the corresponding sheet (paper) on which the image is being formed, but the sorting device is mounted. If the processing mode such as sorting mode or stapling is not specified even if the paper is not installed or if it is installed, the paper that has not been subjected to image formation is ejected from the machine as it is Perform stop processing. This can minimize the probability of forcibly stopping the transfer paper during image formation.

This is because when the sorter is not connected and a simple paper discharge tray is mounted, or in the non-sort mode, even if paper is discharged, paper for which image formation has not been completed can be easily distinguished. This is because it is possible.

Next, an embodiment in which the type of abnormality detected by the document feeding abnormality detecting means is judged will be described.

FIG. 14 is a jam monitoring flow chart (No. 2).

First, waiting for the copy start key 605 to be pressed (S701), if the copy start key 605 is pressed, it is judged from the original size, the copy magnification, etc. whether or not the flow reading operation is possible (S702). If the flow reading is possible, the flow reading mode flag is set (S70).
3) If the flow reading mode flag is set (S
704), monitoring the JAM of RDF2 (S705), R
When the JAM of DF2 occurs, it is determined by the determination control circuit including the sensor S1 whether the type of the jam of the RDF2 is the jam of the separation portion for the next document (S7).
06), when it is other than the separation unit jam, the corresponding paper task during image formation is notified of the occurrence of JAM (S708),
Monitoring is continued until the copy is completed (S709), and the process is completed when the copy is completed.

That is, when the jam of the RDF2 occurs in the flow-reading mode, basically, the jam is stopped for the corresponding sheet on which the image is being formed.
If the type of jam is a jam that does not affect the document conveyance during image formation, such as a separation jam for the next document, the RDF jam is detected at the same timing as the conventional one, and the stop operation is performed. After the sheet is ejected). As a result, it is possible to prevent the state of the paper on which the image formation is not completed, and to minimize the probability of forcibly stopping the transfer paper during the image formation.

In the present embodiment, the judgment is made by the separation jam of the RDF2.
Any document that does not affect the document conveyance during image formation may be excluded from the target of forced stop.

The sheet stopped by the jam is taken out by opening the front door of the copying machine. The same is true for the jammed document, which is taken out from the pass. After the jam is cleared, the document is reset, the document is set again, and the copy button is pressed to restart.

The same applies to the case where the sheet is ejected without being stopped, and the original jam may be taken out and then the original may be set again. By displaying that the blank sheet is discharged, the operator starts the restart after removing the blank sheet from the tray.

Another combination of the copying machine and the sorter will be described with reference to FIG.

100 is an upper cassette, and the sheets in the cassette are separated and fed one by one by the action of the separating claw and the feeding roller 101 and guided to the registration rollers 106. 1
Reference numeral 02 denotes a lower cassette. Sheets in the cassette are separated and fed one by one by the action of a separation claw and a feeding roller 103, and are guided to a registration roller 106. A manual guide 104 guides sheet materials one by one to a registration roller 106 via a roller 105. Reference numeral 108 denotes a sheet stacking device (deck type), which is an intermediate plate 10 that is raised and lowered by a motor or the like.
8a, the sheets on the middle plate are separated and fed one by one by the action of
Lead to zero.

Reference numeral 112 is a photosensitive drum, 113 is a reading optical system, 114 is a developing device, 115 is a transfer charging device, and 116 is a separation charging device, which constitute an image forming section.

Reference numeral 117 is a conveyor belt for conveying the image-formed sheet material, 118 is a fixing device, 119 is a conveyor roller, and 120 is a flapper. The sheet material on which the image is formed is guided to the discharge roller 121 by the flapper 120 and is conveyed into the sorter 122. The sorter 122 includes a non-sort tray 122a, a sort bin tray 122b,
It has a non-sort tray discharge roller 122c and a sort bin tray discharge roller 122d. The non-sort tray and the sort bin tray move up and down to sort sheets one by one.
A discharge tray may be attached instead of the sorter.

An automatic document feeder 130 has a tray 130a, a separating means 130b, a return path 130c, and a discharge roller 130d. Documents are positioned one by one on the platen 131 by the apparatus 130 and read by the optical system. A transport belt 132 guides the document to the platen in a forward rotation (arrow A), and discharges the document from the platen in a reverse rotation.

An image is formed on the photosensitive drum in accordance with the set number of copies for one original placed on the platen, and the sheet material for the number of copies is set in the cassette 10.
Each time an image is formed on the photosensitive drum, the image is fed from any of 0, 102, and the deck 108. The registration between the image on the photosensitive drum and the sheet material is performed by the registration roller 106.

When the required number of copies are formed, the original is ejected from the platen, and the next original is positioned on the platen. Hereinafter, the same applies.

Reference numeral 200 denotes an intermediate tray, which is used to form an image on both sides of a sheet material or to form an image on one side of the sheet material (multiplexing). To stock. 201 is a conveying roller, 2
Numeral 02 is a transport belt, 203 is a flapper, 204 is a transport belt, and 205 is a transport roller. In the case of double-sided copying, the sheet is guided to the intermediate tray 200 through the path 206. The sheet has the image side facing up. In the case of multiple copy, the sheet material is guided to the intermediate tray 200 through the path 207. The sheet material has the image side facing down.

The sheet material stacked on the intermediate tray 200 includes auxiliary rollers 209, 210 and a pair of forward / reverse separation rollers 2
By the action of 11, the sheets are separated one by one from below and are re-fed. The re-fed sheet material is conveyed by the conveying rollers 213, 2.
14, 214, roller 110, registration roller 106
Through to the image forming unit. After image formation, the paper is discharged in the same manner as described above.

According to the number of copies set for one original placed on the platen, first one-sided copy is made, and these are stacked on the intermediate tray 200. After that, the original is reversed on the platen and guided again on the platen, and this image is read by the number of copies. The read image is formed on a sheet material re-fed from the intermediate tray 200 every time the image is read. They are sorted by the sorter 122 in page order.

On the other hand, the original is fed by the automatic original feeding device 1
There is also a method of making only one copy for each circulation. According to this method, even when a plurality of copies are created, a copy group in which the page order is uniform is sequentially obtained, so that the required number of copies can be obtained separately without the sorter. When performing double-sided copying by this method, both sides of one original are continuously read, the front and back sides of the sheet material are continuously copied and ejected, and then the same is applied to both sides of the next original.
If this is repeated for sensitivity, a group of divided double-sided copies can be obtained.

[0080]

As described above, when the document feeding abnormality detecting means detects the document feeding abnormality during image formation, the type of the post-processing means or the presence / absence of connection, or the document feeding abnormality. The probability of forcibly stopping the transfer paper during image formation is minimized by determining the type of abnormality detected by the detection means and forcibly stopping the transfer paper during image formation only under certain conditions. Therefore, it is possible to surely prevent the transfer paper on which image formation is completed and the transfer paper on which image formation is not completed from being mixed.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a copying apparatus.

FIG. 2 is a configuration block diagram of a main body control device.

FIG. 3 is an external view of an operation panel.

FIG. 4 is an operation diagram of a flow-reading mode.

FIG. 5 is a perspective view of a main body unit.

FIG. 6 is a perspective view of a right door processing screen.

FIG. 7 is a perspective view of a fixing transport unit processing screen.

FIG. 8 is a flowchart of a paper feeding task.

FIG. 9 is a flowchart of a paper task.

FIG. 10 is a flowchart of a jam display task.

FIG. 11 is a flowchart of paper removal processing.

FIG. 12 is a flowchart of a jam post-processing task.

FIG. 13 is a flowchart (part 1) of the jam monitoring unit.

FIG. 14 is a flowchart (part 2) of the jam monitoring unit.

FIG. 15 is a schematic sectional view of another embodiment of the copying machine with a sorter.

[Explanation of symbols]

 1 Copying Machine 2 Revolving Automatic Document Feeder (RDF) 3 Image Forming Apparatus Main Body 5 Platen Glass 6 Optical System 7 Image Forming Section 9 Paper Feed Cassette 13 Registration Roller

Claims (13)

[Claims] 1. A document feeding unit for feeding a document, a reading unit for reading the fed document, an image forming unit for forming an image of the read document on a sheet, and a sheet for feeding to the image forming unit, In the image forming apparatus including the automatic document feeder, which has a sheet conveying unit that discharges the image-formed sheet and an abnormality detecting unit that detects an abnormality in the document feeding in the document feeding unit, An image forming apparatus provided with an automatic document feeder, which has a selection control means for selecting whether to stop the sheet conveyance or eject the sheet when an abnormality is detected. 2. The selection control means, when the processing means for processing the discharged sheet is connected, stops the conveyance of the sheet, and when not connected, discharges the sheet. An image forming apparatus comprising the automatic document feeder according to claim 1, which is controlled. 3. The selection control means, when the processing means for processing the discharged sheet is connected, stops the conveyance of the sheet when the processing mode for operating the processing means is selected, and the processing mode The image forming apparatus including the automatic document feeder according to claim 1, wherein the conveying unit is controlled so that the sheet is discharged when is not selected. 4. The selection control means controls the conveying means to discharge the sheet when the processing means for processing the discharged sheet is not connected, while the selection control means processes the discharged sheet. When the means is connected, the conveyance means is controlled so that the conveyance of the sheet is stopped when the processing mode for operating the processing means is selected and the sheet is discharged when the processing mode is not selected. An image forming apparatus comprising the automatic document feeder according to claim 1. 5. The image forming apparatus having an automatic document feeder according to claim 1, wherein the selection control means makes a selection based on the type of abnormality detected by the abnormality detection means. 6. The selection control means stops the sheet when the type of abnormality affects the image formation on the sheet, and discharges the sheet when the type of abnormality does not affect the sheet.
An image forming apparatus comprising the automatic document feeder according to claim 5. 7. The image forming apparatus having an automatic document feeder according to claim 6, wherein the type of abnormality is a jam when separating the next document. 8. The image forming apparatus according to claim 1, wherein the processing means is a sorter having a large number of bin trays for distributing sheets. 9. The processing means is a binding means for binding a sheet bundle discharged onto a tray, according to claim 1.
And an image forming apparatus including the automatic document feeder. 10. The image forming apparatus according to claim 1, wherein the processing unit is a sorter with a binding unit. 11. An image forming apparatus provided with an automatic document feeder according to claim 1, wherein the reading means is fixed and the document is read while traveling. 12. An image forming apparatus provided with the automatic document feeder according to claim 1, wherein the set document is read by moving the reading means. 13. The document feeding unit includes a tray on which a document is placed, a feeding unit that separates and feeds the documents on the tray one by one, and a conveying unit that feeds the fed document to the reading unit. The sheet conveying means includes a cassette for storing the sheets, a feeding means for separating and feeding the sheets one by one from the cassette, a pause for the fed sheets, and a resist for sending the sheets to the image forming means with a timing. A rotation unit and a discharge rotation unit that discharges the image-formed sheet.
13. An image forming apparatus including the automatic document feeder according to any one of 12.