JPH0962151A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent printing and recording operation from being stopped if possible when a fault is caused, and also to obtain a printed or recorded matter having high reliability. SOLUTION: A form 41 is fed from a paper feeding tray 42, and a toner image is transferred and fixed on it, and it is ejected on a paper ejecting tray 46. In the case that the fault is caused halfway, the form 41 at a position P2 or on an upstream side therefrom is temporarily stopped to be fed, and when the toner image in a page at the time of the occurrence of the fault is formed on the photoreceptor drum 43, feeding is restarted. Thus, the forms existing at the positions P1 and P2 become unnecessary to be subjected to a purging processing and are effectively used, so that the page order of the printed matter or the like is secured and the reliability is secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print control device for controlling the operation of a printing device that prints using cut sheets, and more specifically, is characterized by control when an abnormality occurs during printing. The present invention relates to a print control device.

[0002]

2. Description of the Related Art In a laser printer, for example, printing is performed by forming an electrostatic latent image on a photoconductor using print data obtained from an information source such as a host computer. The development of printing technology for such non-impact type printing devices has been remarkable, enabling high-quality printing on cut sheets and dramatically improving the reliability of the device against jams (paper jams). ing. As a result, such a non-impact type printing device is actively used in a special field such as a financial system in which a dot printer is used to print on fanfold paper from the viewpoint of reliability. It is becoming used.

However, in a field where high reliability of printing is required, such as a printing apparatus used in a financial backbone system, even one character of printed content may have a faint print, black spots or white spots. If there is a printing error such as "Yes", the displayed amount of money will be different.
It will be a fatal error. The same applies when some pages of a document that should be continuous are missing. Therefore, in this type of printing apparatus, an abnormality detection mechanism for ensuring the correctness of printing is arranged everywhere.

On the other hand, such a printing apparatus is generally a large-sized and high-speed apparatus and is often operated day and night. Therefore, while it is required to detect printing abnormalities, it is possible to perform non-stop operation as much as possible while avoiding productivity deterioration and human intervention due to machine stoppages, and the performance of printing results as described above. Are required to be prepared.

Japanese Patent Laid-Open No. 4-187478 discloses a technique for avoiding a jam when various abnormalities occur during printing. In this proposal, an error that does not affect printing, such as a communication error between a master CPU (central processing unit) that controls the printer as a whole and a slave CPU that shares control of each part, is dealt with. It is distinguished from other errors. When an error that does not affect printing occurs, the printed paper is ejected as a normal printed matter, while the paper supply for printing is stopped and the printer is stopped. Prevents unnecessary jams. Further, by distinguishing between an error at a position where a strict operation timing is required in the sheet conveyance system and an error where a strict operation timing is not particularly required at this conveyance system, the latter error is retried, If this succeeds,
By continuously operating the printing device without stopping it, the situation where the printing device is stopped is avoided as much as possible.

[0006]

However, according to this proposal, the error to be identified or detected in order to avoid the occurrence of jam is limited to the one which does not affect the printing. Therefore, when an error that affects printing occurs, it is out of the control range, and there is a problem that the effect of preventing the occurrence of a jam in the printing device is not sufficient.

Further, in the proposed apparatus, the retry when an error occurs is limited to the one which is not directly related to the timing of the paper transport system. Therefore, only a part of the error that does not actually stop the printing device is retried, and as a result, the stop ratio of the printing device cannot be sufficiently reduced. That is, the majority of electrical errors during printing that occur except when the main body of the image forming apparatus fails are accidental due to external noise or the like, but in general, these are directly related to the timing of the paper transport system. It is rarely specified that the error does not occur, and in the proposed apparatus, most errors are directly linked to the control that stops the printing operation.

Although the problems of the prior art have been described above centering on the printer, the same problem also occurs in an image forming apparatus that generally forms an image and records the image, such as a copying machine and a facsimile machine.

Therefore, a first object of the present invention is to provide an image forming apparatus capable of obtaining a highly reliable printed matter or recorded matter without stopping printing or recording operation as much as possible when an error or failure occurs. To do.

A second object of the present invention is to make the paper already sent out from the paper supply source as effective as possible when an error or failure occurs in recording an image of a plurality of pages, one page at a time. The present invention relates to an image forming apparatus which is utilized for recording.

A third object of the present invention is to connect a sorter to an image forming apparatus such as a copying machine when an error or failure occurs when recording images of a plurality of pages, one page at a time. The present invention relates to an image forming apparatus in which printed matter or recorded matter of each page is sorted into an appropriate bin and discharged.

[0012]

According to a first aspect of the present invention, there are provided (a) an image forming means for forming an image by various methods such as xerography, and (b) an image forming means by the image forming means. Failure occurrence detection means for detecting the occurrence of an affecting failure, (c) a paper supply source for supplying a paper for recording the formed image toward the image forming means, and (d)
A timing adjusting means arranged between the sheet supply source and the image forming means for adjusting the timing when the sheet sent out from the sheet supply source reaches the image forming means, and (e) a failure occurrence detecting means for preventing the occurrence of a failure. The image forming re-execution means for causing the image forming means to re-form an image when a failure occurs when it is detected, and (f) the timing adjusting means is re-executed when the image forming re-execution means re-forms an image. The image forming apparatus is provided with a timing adjusting means control means for adjusting according to the image formation.

That is, according to the first aspect of the invention, an image to be transferred onto the paper itself such as a toner image or a RAM (random access memory) by various methods such as xerography.
An electric image that has not been visualized is formed in a memory or the like, and the occurrence of a failure affecting these image formations is detected by the failure occurrence detection means. The detection of a failure by the failure occurrence detection unit is a detection of a failure (error) that may affect an image, and does not detect whether or not a failure has actually occurred in the image. The same applies to the inventions according to claims 2 to 4.

According to the present invention, the timing adjustment of the timing adjusting means for adjusting the timing at which the sheet for recording the formed image reaches the image forming means can be adjusted in accordance with the re-forming of the image. The faulty image will be re-formed. The re-formed image is recorded on the paper of which the timing is adjusted. In this way, when a failure that may affect the recording of an image is detected, the image is re-formed without stopping the recording control itself such as the image formation of the apparatus, and the timing is increased during the conveyance. It is possible to obtain a highly reliable printed matter or recorded matter by using the adjusted paper.

According to the second aspect of the present invention, (a) image forming means for forming an image by various methods such as xerography, and (b) occurrence of a fault affecting the image formation by the image forming means. Failure occurrence detection means for detecting
(C) A paper supply source that supplies a paper for recording the formed image toward the image forming means, and (d) is arranged between the paper supply source and the image forming means, and is sent out from the paper supply source. The timing adjusting means for adjusting the timing at which the sheet reaches the image forming means by temporarily stopping the sheet and sending it again at a predetermined timing, and (e) the failure occurrence detecting means has detected the occurrence of the failure. An image forming re-execution unit that causes the image forming unit to re-form an image when a failure occurs, and (f) a sheet or timing when the image forming re-execution unit re- forms an image The sheet before reaching the adjusting means is stopped at the timing adjusting means or at a predetermined position before this, and when the image is formed again, the sheet is stopped for this image. A timing adjustment means control means for adjusting the timing of the delivery of the paper in is provided in the image forming apparatus.

That is, according to the second aspect of the present invention, an image to be transferred such as a toner image or an electric image which has not been visualized in the RAM or the like is formed by various methods such as xerography, while these images are formed. Occurrence of a fault affecting formation is detected by the fault occurrence detecting means.
Then, while making it possible to adjust the timing adjustment of the timing adjusting means for adjusting the timing at which the sheet for recording the formed image reaches the image forming means, it is possible to re-execute the image formation. When the means re-forms the image, the timing adjusting means or the sheet before reaching the timing adjusting means is stopped at the timing adjusting means or at a predetermined position in front of the timing adjusting means, so that a failure may occur. When a certain image is formed again, the timing of feeding the stopped paper is adjusted with respect to this image. In this way, by simultaneously stopping the sheets on the transport path on the upstream side of the timing adjusting means, even if there are a plurality of sheets already sent to the transport path, they are not wasted, and It is possible to obtain a highly reliable printed matter or recorded matter by using the re-formed image without stopping recording control itself such as image formation of the apparatus.

According to the third aspect of the invention, (a) image forming means for forming an image in a predetermined order on successive pages, each page corresponding to one sheet of paper,
(B) Failure occurrence detection means for detecting the occurrence of a failure that affects the image formation by the image forming means, and (c) Paper for supplying the paper for recording the formed image toward the image forming means. The sheet is disposed between the sheet supply source and (d) the sheet supply source and the image forming means, and the sheet sent from the sheet supply source is temporarily stopped and is re-sent at a predetermined timing. (E) When the failure occurrence detection means detects the occurrence of a failure, the timing adjustment means for adjusting the timing at which the paper arrives, and the image formation from the same page as the image page formed when the failure occurs in the image forming means are formed again. Image forming re-execution means to be executed,
(F) When the image forming re-execution means re-forms an image, the timing adjusting means stops the stopped paper or the paper before reaching the timing adjusting means at the timing adjusting means or at a predetermined position before this. Before the re-adjustment of the timing is performed by the timing adjusting means control means for adjusting the timing of feeding the paper which is stopped for this image when the alternate image is formed again, and (g) the timing adjusting means control means. Image and the purge control means for discharging to the special tray the paper on which the image after the page where the failure occurrence detecting means detected the occurrence of the failure is recorded as the paper other than the paper on which the normal recording is performed. It is equipped in the forming device.

That is, the invention according to claim 3 relates to the case where images are formed in a predetermined order in such a manner that one sheet corresponds to one page by the image forming means by various techniques such as xerography. When the occurrence detection unit detects the occurrence of a failure, the sheet fed from the sheet supply source is temporarily stopped, and the image is formed from the same page as the image page formed when the failure occurs in the image forming unit. I'm trying to do it again. Further, regarding the paper of the page on which the image is formed again and the paper of the subsequent pages on which the image has already been formed, the trays other than the regular paper discharge tray (purge tray) are purged by the purge control. By ejecting the sheets, it is ensured that the sheets are ejected to the regular tray in a state in which the order of the pages is not disturbed even if the sheet is not damaged. Of course, according to the invention described in claim 3, not all the sheets once fed from the paper feed tray are accommodated in the purge tray as in the conventional case, but the timing is adjusted again by the timing adjusting means control means. Since the paper is recorded by the image reconstructed in the order of pages, the waste of the paper is reduced and it is possible to prevent the occurrence of a situation in which the apparatus is stopped when a failure occurs.

According to a fourth aspect of the present invention, (a) image forming means for forming an image in a predetermined order on successive pages, each page corresponding to one sheet of paper,
(B) Failure occurrence detection means for detecting the occurrence of a failure that affects the image formation by the image forming means, and (c) Paper for supplying the paper for recording the formed image toward the image forming means. The sheet is disposed between the sheet supply source and (d) the sheet supply source and the image forming means, and the sheet sent from the sheet supply source is temporarily stopped and is re-sent at a predetermined timing. The timing adjusting means for adjusting the timing at which the paper arrives, and (e) when the failure occurrence detecting means detects the occurrence of the failure, the image forming means again forms an image on the same page as the image page formed when the failure occurs. Image forming re-execution means to be performed, and (f)
When the image forming re-execution means re-forms an image, the paper which has been stopped by the timing adjusting means or the paper which has not reached the timing adjusting means is stopped at this timing adjusting means or at a predetermined position before this. When the image is formed again, the timing adjusting means control means for adjusting the timing of feeding the stopped paper to this image, and (g) the paper before the timing readjustment by the timing adjusting means control means are performed. Therefore, the paper on which the subsequent images are recorded excluding the page where the failure occurrence detection means has detected the occurrence of the failure is sequentially skipped to the bins corresponding to the pages where the occurrence of the failure of the sorter is skipped. First sorter bin control means for accommodating, and (h)
The image forming apparatus is provided with a second sorter bin control unit that stores the paper of the page on which the image formation is performed again by the image formation re-execution unit in the bin corresponding to the page in which the occurrence of the failure is detected.

That is, the invention according to claim 4 is the same as claim 3
It is an invention established from a different viewpoint from the described invention, and in this case, an image forming apparatus connected to a sorter is handled. When the bins are set in the sorter so as to correspond to the pages in order, it is not always necessary to interrupt the image forming operation currently in progress and to form the image again from the page in which the failure has occurred. That is, even if the bins are skipped and the sheets are accommodated, even if the sheets corresponding to the empty bins are accommodated in the bins later, the page order is ensured in correspondence with the bins of the sorter. Further, as a result, it is possible to reduce the ratio of the paper that is subjected to the purge control and is actually discarded, and it is possible to reduce the waste of paper.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a case where the image forming apparatus of the present invention is a printer, and print data is supplied from the host computer in the order of pages to perform printing will be described.

【Example】

FIG. 1 shows an outline of the configuration of the printer. The printer 11 of this embodiment includes a print control unit 13 that receives print data 12 from a host computer (not shown), and a print unit 14 that is connected to the print control unit and that records an image.

The print control unit 13 includes an input control device 21 that receives the print data 12. The received print data 12 is sequentially stored in the spool device 22 page by page, and is read out in a predetermined page order for printing. The print data read from the input control device 21 is input to the image generation device 23 and the image of each page is generated. This image is expanded in the page buffer 24 page by page. The first main control CPU 25 performs the overall control of the print control unit 13, and the image data expanded in the page buffer 24 is controlled by the first video control device 26 as print data, and the print unit 14 side. To send. Also,
Various other control data are transmitted / received to / from the printing unit 14 side via the first communication control device 27.

An example of such control data is whether the print data read from the spool device 22 for printing is in ascending order or descending order, or whether it is in a predetermined page order for double-sided recording. There is page identification information sent from the printing unit 14 for specifying. The printing unit 14 also sends a video synchronization signal indicating the transmission timing of the video data to the printing control unit 13. When the print control unit 13 receives the video synchronization signal, the print control unit 13 specifies the page to be currently transmitted, and prints the print data.
Will be sent to

The control operation by the first main control CPU 25 is performed by controlling a program stored in a hard disk (not shown) shared with the spool device 22. The RAM (not shown) stores these programs to be executed and also temporarily stores various data associated with the execution of the programs.

The printing unit 14 has a second main control CPU 31 for performing this overall control. The second main control CPU 31 controls the printing device unit 32 including the main body of the laser printer to record an image on a sheet not shown in the figure. Print control unit 13
The second video control device 34 transmits the video data from the first video control device 26 by using the control data obtained from the second communication control device 33 which transmits and receives various data to and from the first communication control device 27. The image data is received and transmitted to the ROS control device 35 to cause the printer device 32 to perform raster scanning of the image.

FIG. 2 shows the main part of the printing device section. The printing unit 14 is a sheet 4 cut into a predetermined size.
A sheet feeding tray 42 in which 1 is stacked is provided. The paper 41 sent out from the paper feed tray 42 is the photosensitive drum 4
3 and transfer corotron 44 and fixing device 4
The sheet is usually discharged to the sheet discharge tray 46 via 5, and this conveying route will be referred to as a main conveying path 47.
A route from the predetermined position before the end of the main transport path 47 to the purge tray 48 is called a purge transport path 49. The purging conveying path 49 is for conveying the sheet conveyed by the purging control. In this example, the purge tray 48 is arranged at the end of the purging transport path 49, but it is not necessary to arrange such a tray, and the purged paper 41 may flow out of the apparatus depending on the apparatus. You may make it discharge | emit by a formula.

In front of the photosensitive drum 43 and the transfer corotron 44 in the main conveyance path 47, a registration gate 51 for adjusting the conveyance timing of the paper 41 is arranged. Further, in this embodiment, resist rolls 52 and 53 are arranged immediately upstream of the registration gate 51. In addition, the first sheet sensor 5 for detecting the leading edge of the sheet 41 is provided between them.
4 are arranged. Registration gate 51
Is closed when the leading edge of the paper 41 sent out from the paper feed tray 42 to the main transport path 47 passes through the registration rolls 52 and 53 and is detected by the first paper sensor 54. It is supposed to block. At this time, the conveyance of the sheet 41 by the registration rolls 52 and 53 is also stopped. After that, the registration gate 51 opens in synchronization with the image formed on the photoconductor drum 43, and the feeding of the paper 41 is started by the constant speed rotation of the registration rolls 52 and 53.

FIG. 3 shows the periphery of the photosensitive drum. When the start of printing is instructed, the photosensitive drum 43 starts rotating at a constant speed in the direction of arrow 61 by a main motor (not shown) at the time of cycle up (startup). Then, when each unit including the fixing device 45 of the printing unit 14 is ready to start printing, the above-mentioned video synchronization signal is sent with the page identification information added. Around the photosensitive drum 43, for example, a charging device 62 represented by a charge corotron, a developing device 63, the transfer corotron 44 or the transfer device described above, and a cleaning device 64 are sequentially arranged in a clockwise direction. There is. The charger 62 uniformly charges the surface of the photoconductor drum 43 to a predetermined polarity.

A laser beam 66 is repeatedly scanned in the axial direction of the photoconductor drum 43 at a predetermined position on the drum surface between the charger 62 and the developing device 63.
The laser beam 66 is deflected by the laser beam modulated by the semiconductor laser 67 under the control of the second video controller 34 shown in FIG. Is deflected by a polygon mirror 68 that is typically used as.

Laser beam 6 on photoconductor drum 43
The electric charge at the position where 6 is irradiated disappears selectively by the on / off control of this beam, and an electrostatic latent image corresponding to the image of each page is formed on the drum surface. The position of the drum surface where the leading line of the image on each page is scanned by the laser beam 66 is defined as P ₁ . When the point P ₁ reaches the position P ₂ just above the transfer corotron 44 by the rotational movement of the drum surface, the paper 4
If the recording start position at the tip of 1 reaches this position P ₂ ,
The recording start positions of the pages are aligned. The opening / closing control of the registration gate 51 shown in FIG. 2 is performed for this timing adjustment.

By the way, in the printer 11 of this embodiment, various sensors other than the first paper sensor 54 shown in FIG. 1 are used for detecting various states in the apparatus. The sensors used in the printer 11 are roughly classified into a paper sensor for detecting the conveyance state of the paper, an influence on the formation of the image itself, and a problem on the quality of the paper on which the image is recorded. It is classified into an abnormality sensor for detecting a general abnormality of the device. These will be described with reference to FIGS. 2 and 3.

A second paper sensor 71 is arranged on the outlet side of the paper feed tray 42 in FIG. 2 to detect a feed error or the like when the conveyance of the paper 41 is started.
A third paper sensor 72 is arranged immediately after the transfer corotron 44 or in the vicinity of the surface of the drum, and a mistake in peeling the paper 41 from the photosensitive drum 43 is detected. Immediately after the fixing device 45 including a heat roll and a pressure roll, the fourth paper sensor 7
3 are arranged. The fourth paper sensor 73 detects the paper 4
The detection is performed when 1 is mistakenly wound around the roll surface of the fixing device 45. Instead of this, or in combination with this detection, the fixing temperature, that is, the abnormality of the fixing control device may be detected.

A fifth sheet sensor 74 is arranged in the vicinity of a branch point between the main conveyance path 47 and the purging conveyance path 49.
The occurrence of jams is monitored by a switching gate (not shown) at the branch point. A sixth paper sensor 75 is arranged near the entrance of the paper discharge tray 46 to monitor whether or not the paper 41 is normally discharged to the paper discharge tray 46. A seventh paper sensor 76 is arranged near the entrance of the purge tray 48, and is used to monitor whether or not the paper discharged by the purge control is normally discharged.

Next, the arrangement of the abnormality sensor for checking the abnormality other than the conveyance of the sheet will be described. A first abnormality sensor 78 is arranged in or near the second video control device 34 in FIG. The first abnormality sensor 78 is a sensor circuit that detects noise generated in or near the second video control device 34 and an error in video data. Video data error detection is
For example, it is detected that the video data is artificially generated in a section where the video data originally does not exist outside the scanning range of the image, or a signal that exceeds the amplitude of the binary signal as the video data is generated. Sometimes this is done by detecting.

Depending on the device, two or three or more signal processing circuits including a predetermined circuit portion of the print control unit 13 are prepared, and video data are processed in parallel by these signals, and the output side of these outputs is processed. The signal state may be checked in synchronization with the pixel clock. That is,
If the signal states of the video data output in parallel in synchronization with the pixel clock are completely the same, it is normal.
Abnormality may be detected when there is a portion that does not match.

A second path is provided on or near the path through which the laser beam 66 output from the polygon mirror 68 passes.
The abnormality sensor 79 is arranged. The second abnormality sensor 79 checks whether the level of the laser beam 66 output from the laser 67 is normal or not by detecting a beam outside the scanning region of the laser beam 66 corresponding to the image, for example. It is checked whether the polygon mirror motor (not shown) for rotating the mirror 68 is normally rotated.

Developing device 63 and transfer corotron 4
A third abnormality sensor 81 is arranged in the vicinity of the drum surface between 4 and 4. The third abnormality sensor 81 detects the actual density of the toner image of the image formed in a test in a predetermined area on the photosensitive drum 43 before the development of the regular image is performed. Then, it is arranged to inspect whether the charger 62 and the developing device 63 are operating normally. When the image density is out of order, the image density adjusting circuit (not shown) performs the adjustment, so that the detection is also performed when an abnormality occurs in the image density adjusting circuit.

Returning to FIG. 2, the fixing device 82 is provided with a fourth abnormality sensor 82. Fourth abnormality sensor 82
Checks whether the temperature for thermally fixing the toner image on the paper 41 is normal. Therefore, the fourth abnormality sensor 82 can substitute the existing temperature detecting element or circuit in the fixing temperature control circuit. Depending on the printer or other image forming apparatus, the abnormality sensor other than these may be used additionally or as a substitute for some or all of the abnormality sensors described above, depending on the unique viewpoint of the apparatus. Is.

A description will be given of how the printer 11 having such a configuration forms an electrostatic latent image of each page on the photosensitive drum 43 and controls the conveyance of the paper 41. As described above, when the instruction to cycle up is issued, the driving of the main motor is started, and the video synchronizing signal with the page identification information is sent from the printing unit 14 to the printing control unit 13, at a predetermined timing. Instruct to start feeding. As a result, the feed roll (not shown) is driven, and the feeding of the paper 41 from the paper feed tray 42 in FIG. 2 is started. The leading end of the fed first sheet 41 is the registration roll 52,
When the first sheet sensor 54 passes through 53 and detects this, the rotation of the registration rolls 52 and 53 is stopped. At this time, the registration gate 51 is closed. The printing unit 14 controls printing when the paper 41 is detected by the first paper sensor 54, or when necessary, a paper sensor is arranged further upstream than this and the front end of the paper 41 is detected. A trigger signal for notifying the section 13 of the transmission timing of the video data of the first page is transmitted. This trigger signal is sent in a form with page identification information added.

After a lapse of a predetermined time, a pixel sync signal for video data transfer is generated and video data reception is started. The received video data is converted into laser beam on / off information, and an electrostatic latent image is formed on the photosensitive drum 43 by using this. The registration gate 51 opens at a predetermined timing in synchronization with the rotation of the photosensitive drum 43, and starts the conveyance of the paper 41. In this way, the toner image is transferred to the first sheet of paper 41 conveyed by the registration rolls 52 and 53. The transferred toner image is fixed when the paper 41 passes through the fixing device 45, and is discharged to the paper discharge tray 46.

While such control for the first sheet of paper 41 is in progress, formation of electrostatic latent images on the second and subsequent sheets of paper 41 also proceeds in sequence while delaying the time.
As a result, if there is no problem in image formation or conveyance of each sheet 41, electrostatic latent images are formed on the photosensitive drum 43 one page at a time, for example, in ascending order. Images are sequentially recorded on the paper 41, and the paper output tray 46
Are sequentially discharged. When the printing of all pages is completed, control for ending the printing cycle is performed, and the operation of each part including the main motor is stopped in a predetermined sequence (cycle down) to complete the printing operation.

Next, the purge control for discharging the paper 41 to the purge tray 48 will be described. The purge tray 48 is
This is for ejecting defective printing paper detected during printing. If the second abnormality sensor 79 detects an abnormality, the image of the page being created at that time may have a problem in image quality. In the case of this example, the paper 41 of the page
Is advanced to the purging transport path 49 by the above-mentioned switching gate and discharged to the purging tray 48.

Main transport path 4 upstream of the switching gate
When the length of 7 is relatively long, there is a possibility that the succeeding sheets 41 other than those advanced to the purging conveying path 49 are conveyed in a line. Conventionally, the paper 4 that has caused an abnormality
As for the papers 41 after the first paper, all the papers already sent out from the paper feed tray 42 were to be discharged to the purge tray 48. Especially in the field of printing, it is important to print on each sheet 41 in the page order and to discharge the sheets 41 to the sheet discharge tray 46 in the page order.
That is, when a page is generated in which an abnormality has occurred and image recording is to be performed again, even if it can be estimated that there is no problem in the image of the subsequent pages, those pages are first output.
Since the order of the pages is out of order when the sheets are discharged to 6, the sheets are all discharged to the purge tray 48.

Also in this embodiment, this principle is the same as the conventional one. However, in this embodiment, the paper feed tray 42 is already used.
Even if the paper 41 is sent from the paper 41, if the paper 41 can be stopped before the photoconductor drum 43, the conveyance of the paper 41 is temporarily stopped. Then, for the page in which the abnormality has occurred, the image is again displayed on the photosensitive drum 43.
The image is to be recorded on the first one of the sheets of paper 41 that has been formed and stopped. That is, in the present embodiment, the paper 41 whose conveyance can be stopped at the registration gate 51 is temporarily stopped by stopping the discharge to the purge tray 48 so far, and is used for recording the image of the page in which the abnormality has occurred. I am trying to do it.

When the conveyance of the sheet 41 being conveyed before reaching the photosensitive drum 43 is temporarily stopped in this way,
Irrespective of this, it is not possible to start the conveyance of the following paper 41 from the paper feed tray 42. The succeeding paper 41 is, for example, the size device paper 4 at the registration rolls 52 and 53.
This is because there is a possibility of catching up with 1 and causing a jam. Therefore, in this embodiment, control for delaying the delivery of the succeeding sheet 41 is performed. These will be described later in detail.

FIG. 4 shows the relationship between the transport positions of the respective sheets in the printer of this embodiment. Each position of the sheet will be indicated by a symbol in relation to the conveyance control of each sheet described below. The position of the paper 41 existing in the paper feed tray 42 immediately before the start of conveyance is P _0, and the position where the leading edge of the paper 41 passes the registration rolls 52 and 53 and is stopped by the registration gate 51 is P ₂ . . It is assumed that the time required to reach the position P ₂ is twice the predetermined unit pitch, and the position of the paper 41 when this unit pitch has elapsed from the paper feed start position P ₀ is P ₁ .

Similarly, assuming that the position when three times the unit pitch when the sheet 41 is smoothly conveyed from the sheet feed start position P ₁ has elapsed is P ₃ , this is the main conveyance. This is a position before the purging transport path 49 branches from the path 47. The position is the P ₄ or P ₄ 'when the four times the unit pitch Similarly when the sheet 41 from the position P ₁ of the sheet feeding start is assumed were being conveyed smoothly has elapsed. Here, the position P ₄ is a position reached when only the main transport path 47 is transported, and the position P ₄ ′ is a position reached when switched to the purge transport path 49 by the purge control and transported.

In the above description, it is assumed that the sheet 41 is smoothly conveyed in the case of the present invention.
Is sometimes stopped at the position P ₂ for a relatively long time, so that such a case is excluded to explain the positional relationship.

FIGS. 5 and 6 show the state of sheet conveyance control in this embodiment, of which FIG. 5 shows the first half thereof, and FIG. 6 shows the latter half thereof. In these figures, (a) shows the transmission page number of the video data, and (b) shows the ID (identification number) of the paper 41 and the discharge destination of the paper 41. Figure (c)
Indicates the position, ID and page of the paper 41. Further, in these figures, "-" represents the state before the toner image is transferred, and "n" represents the page number on which the toner image is transferred. "(N)" represents the page number before the transfer of the toner image. Further, each number of ~ represents the pitch (cycle) for feeding the paper.

In this figure, the cycle up shown by the arrow C-up is performed at time t ₀ . After the lapse of the specified time, the first sheet 41 having the sheet ID “1” is started to be fed from the sheet feed tray 42 at the first pitch. Second paper 4 with paper ID "2" at the next second pitch 4
The delivery of 1 is started. The same applies hereinafter.

The delivery of the first sheet 41 having the sheet ID "1" and the control thereafter will be described in more detail.
When a predetermined time elapses after the cycle up is performed at time t ₀ , the paper feed signal H ₁ for the first paper 41 is transmitted from the printing unit 14 to the print control unit 13. The print control unit 13 responds with the paper ID of "1".
The feed command F _{1 of} is transmitted. At this time, since the paper 41 is still at the paper feed start position P ₀ , the video request signal for requesting the expansion of the video data is not output. In FIG. 5, this is represented by the code R ₀ .

At the second pitch, the second sheet 41
The paper feed signal H ₂ is sent from the printing unit 14 to the printing control unit 13. In response to this, the print control unit 1
3 sends a feed command F ₂ with a paper ID of “2”.
Further, the video request signal R ₁ is transmitted from the printing unit 14 to the printing control unit 13 at a predetermined timing in preparation for the transfer of the image on the first sheet 41. Based on this, the video signal V ₁ of the first page is sent to the printing unit 14 before the third pitch is started.

Thereafter, at the third pitch, the first sheet 41 having the sheet ID "1" reaches the position P ₂ , and the toner image corresponding to the first sheet 41 is formed on the photosensitive drum 43. Has been done. At the fourth pitch, the first sheet 41 having the sheet ID “1” has transferred the toner image and has reached the position P ₃ , and the second sheet 41 having the sheet ID “2” is the registration roll 52. , 53 is in the state of waiting for the conveyance.

It is assumed that a fixing temperature error has occurred in the fixing device 45 shown in FIG. 2 when the fifth sheet is fed at the next fifth pitch. At this time, the second
The toner image has already been transferred to the second sheet 41, but has not yet reached the branch point with the purging transport path 49. Therefore, as shown in FIG. 5B, the first sheet is discharged to the normal discharge tray 46 (bin), but the second tray having the problem is purged by the purge tray 48. The conveyance path is changed for discharging to (purge).

By the way, at the fifth pitch, the toner image of the next third sheet 41 is formed on the photosensitive drum 43, but at the time when the abnormal fixing temperature is detected, the third image is formed. The second sheet 41 is present at the position P ₂ before transfer of the toner image. If the process is continued as it is, the toner image of this page is transferred to the third sheet 41. However,
The second sheet 41 is discharged to the purge tray 48 by the purge control as an abnormal one (to be exact, an abnormal one may occur), so that the contents of one page are skipped. The third sheet 41 to which the toner image of the third page has been transferred is also destined to be discharged to the purge tray 48 by the purge control even if there is no problem in recording.

In order to prevent such waste in the present embodiment, as shown in FIG. 5B, the third sheet is the second sheet on which the toner image of the second page is transferred. I will transfer to. Then, before the sixth pitch starts, the video signal of the second page is sent to the printing unit 14 instead of the video signal V ₄ of the fourth page. During this time, the paper 41 is not delivered from the paper feed tray 42, and the third paper 41 stopped at the position P ₂ still stops at that position. The toner image is formed on the photosensitive drum 43 based on the video signal of the second page. On the other hand, the second sheet of paper 41 that has been determined to have poor fixing
Are discharged to the purge tray 48. In FIG. 7C, an asterisk * represents the sheet ID of the second sheet discharged to the purge tray 48 by the purge control. In this way, the sheet ID of the second sheet becomes the missing number, so the fifth sheet
At the time of the pitch, the paper ID of "3" or more is decreased by "1" and the ID information is transferred.

At the next seventh pitch, the video signal V ₃ of the third page is received and the toner image of that page is created, while the paper 41 is newly fed from the position P _0. . In this state, the sheet 41 stopped at the position P ₂ is also sent out through the registration gate 51, and the toner image of the second page is transferred. Further, the sheet 41 stopped at the position P ₁ also starts moving toward the position P ₂ by restarting the driving of the conveying path in this portion.

At the next eighth pitch, the video signal V ₄ of the fourth page is received and the toner image of that page is created, while the toner image of the third page is transferred to the paper 41. Then, the position P ₃ is reached. At this time, the paper 41 on which the image of the second page that has been re-imaged is recorded
Will be normally discharged to the discharge tray 46. Hereinafter similarly continue printing by the printer of this embodiment, when all printing is completed, so that the cycle down (C-dw) is performed at time t ₁ of the specification.

FIG. 7 shows the contents of the paper management control in the paper feed control section of this printer. The paper feed controller first initializes the paper ID to "0" (step S101). Then, it is checked whether or not the sheet 41 is being conveyed (step S10).
2) If it is in the stopped state (Y), the sheet feed signal H ₀ of the sheet ID is sent (step S103). On the other hand, when the paper 41 is being conveyed (step S102; N), this paper ID is changed to the number next to the ID shown in the paper management table (step S104). Then, the sheet feed signal H _n of the sheet ID is sent (step S103).

FIG. 8 shows the contents of the paper management table. Paper management table 91 is divided into N regions 92 ₁ to 92 _N to "N" from the paper ID is "1". Here, the numerical value N is the maximum number of sheets 41 that can be identified in the printer. In each of the regions 92 ₁ to 92 _N of the sheet management table 91, and the sheet ID, only one paper discharge tray 46 for discharging the sheet 41 where the abnormality has not occurred in a particular (this example discharge destination bin However, the purge tray 48 is a tray prepared when an abnormality occurs and is not specified here. The sheet feed tray (in this embodiment, only the sheet feed tray 42 is used). However, there may be a plurality of them.), The paper size, the current paper position, and the print status information are stored.

Returning to FIG. 7, the description will be continued. The paper feed control unit monitors whether or not the print control unit 13 receives a feed command of a designated paper ID as a response. When the feed command arrives (Y), the set paper ID is registered in the paper management table 91 (step S10).
6). When the feed command does not arrive (step S10)
5; N), this registration work is not performed. Next Step 1
At 07, it is determined whether or not the stop of conveyance of the waiting paper 41 due to the transfer of the paper number when the abnormality occurs is completed. When the conveyance of the sheet 41 on standby is started (Y), the conveyance stop of the sheet is released (step S108). Specifically, the registration gate 51 is opened.

FIG. 9 shows the control contents of the paper discharge controller. This part controls switching of the above-mentioned switching gate at the branch point. First, it is checked whether or not discharge is requested by the purging process (step S201). If there is no such special request, The discharge destination is set to the bin designated in the paper management table 91 (step S202). When the discharge by the purging process is requested (step S201;
Y), the purge tray 48 is set as the discharge destination (step S203). Then, these steps S202, 20
The sheet 41 is discharged to the discharge destination specified in any of 3 (step S204).

FIG. 10 shows the control contents of the abnormality detection control section. If an abnormality occurs, it is checked whether or not the toner image has not been transferred to the paper (step S301). If the registration gate 51 is open and the leading edge of the paper 41 has already reached the vicinity of the photoconductor drum 43 (N), the transfer of the paper is inevitable even after the transfer. Therefore, the error occurs after the transfer. When an error occurs after the transfer of the toner image (Y), the paper ID corresponding to the first paper related to the occurrence of the error to the paper for which the transfer of the toner image is completed is searched (step S30).
2). Then, the discharge destination of these sheets in the sheet management table 91 is changed to the purge tray 48 (step S303). Then, as described with reference to the fifth pitch in FIG. 6, the sheet ID numbers before the transfer of the toner image are changed (step S304). After that, the conveyance of each sheet 41 before the transfer of the toner image is temporarily stopped, and the toner image is re-formed during this period (step S305).

On the other hand, if it is determined in step S301 that there is an error in the stage where the toner image is not transferred (N), the toner image already fed from the paper feed tray 42 is started. The conveyance of the non-transferred paper 41 is temporarily stopped (step S305). This stop does not only occur at the position P ₂ described above,
_{The one} in ₁ will also be included.

Modification

In the embodiment described above, not only is the faulty sheet ejected by the purge control, but the same is true for a succeeding normal sheet on which an image such as a toner image has already been transferred or recorded. Then, it is decided to discharge to a special discharge means such as the purge tray 48 by the purge control. This is because, as described above, the sheets discharged to the regular discharge means such as the discharge tray 46 are not in ascending or descending order with respect to the page. However, when each bin is ejected in association with a page using a sorter, it is possible to remedy these sheets of paper in which no trouble has occurred by performing a certain device.

FIG. 11 shows a state in which a sorter is connected to a copying machine as an image forming apparatus. A sorter 102 is connected to the copying machine 101 of this embodiment. This sorter 102 includes first to tenth bottles 103 ₁ to
103 ₁₀ and one purge tray 104 are provided. The inside of the copying machine 101 has substantially the same configuration as the printer 11 of the previous embodiment except that an image reading unit is provided, and therefore detailed illustration and description thereof will be omitted. .

A sheet (not shown) discharged from the copying machine 101 is fed into the sorter 104 along a conveying path 106 indicated by a broken line. Then, the sheet for which the purge control is performed is conveyed upward and is discharged onto the purge tray 104 arranged above the sorter body. Further, for other sheets, for example, in the mode in which each page is sequentially discharged to each bin 103, the first bin 103 ₁ and the second bin 10
Sheets are accommodated page by page in order from the smallest numbered bin such as 3 ₂ and the third bin 103 ₃ .

In such a copying system, it is assumed that some trouble has occurred during copying of the second page of paper as described above. Therefore, the sheet of the second page is discharged onto the purge tray 104 of the sorter 102. On the other hand, according to the previous embodiment, the image of the third page is formed. Therefore, in this modified example, the images of the third and subsequent pages are copied as usual, and these are stored in the corresponding bins 103 ₃ ,. Then, when copying of all pages is completed, the image of the second page in which the failure has occurred is formed, and the image is formed in the second bin 1.
It is accommodated in 03 ₂ . Therefore, at the stage when the copying operation is completed, the sheets are sorted in the sorter 102 in page order, and the loss of sheets due to the purge control is minimized.

FIG. 12 shows the control operation of the paper discharge controller in this modification. The discharge control unit provided on the sorter 102 side shown in FIG. 11 determines whether or not the discharge destination is the purge tray 104 each time a sheet is sent (step S401). Then, when the discharge destination is the purge tray 104 (Y), control of a gate (not shown) is performed so as to discharge to this (step S40).
2). In other cases (step S401; N),
The sheet is stored in the corresponding bin 103 according to the sheet ID described in FIG. 8 (step S403). In this way, for example, when the paper for the second page is damaged, the second bin 103 ₂ corresponding to this page
And each sheet is accommodated in the corresponding bin 103 originally. That is, the transfer of the paper ID as in the previous embodiment is not performed.

FIG. 13 shows the control operation of the abnormality detection control section.
I gave it away. The image is affected inside the copying machine 101.
Error occurs, the toner image corresponding to this error
It is determined whether the paper has been transferred to the paper (step
S501). If it has not been transcribed yet, i.e.
If you can adjust the timing to convey the paper to the copy area
If it is, transfer the paper before transfer to a paused state,
Reform the toner image and then open the paper transport.
It is started (step S502). In this case,
There is no change in the discharge destination of the paper on which the toner image has been re-formed. I
Therefore, the timing of paper ejection is
Just slip it off each bin 103₁, 103 ₂, ... in order
The paper will be ejected.

On the other hand, if a failure occurs after the transfer of the toner image or in a state where the transfer of the toner image is inevitably caused (step S501; Y), the corresponding paper ID is set in the purge tray 104 (step S503). ). Then, a flag for starting copying corresponding to the sheet ID after the current series of copying is completed is set (step S504). Then, in consideration of the situation in which the sheet before the transfer of the toner image is sent out on the conveying path, the conveying path for the sheet on which the transfer is not performed is set to the suspended state (step S502).

FIG. 14 shows the control operation of the copy start control section of the copying machine in this modification. When the series of copying operations currently being performed is completed (step S6)
01; Y), and it is checked whether the flag for restarting copying described in step S504 is set (step S602). If this flag is not set (N), it means that all the sheets are stored in the regular bins 103 ₁ , 103 ₂ , ... Without performing the purge control. Therefore, in this case, the copying operation is finally ended.

On the other hand, when the flag for resuming copying is set (Y), the image of the page number indicated by the flag is formed and the corresponding page (fault Copying of the page in which the occurrence of is occurred (step S603). At this time, the sheet ID is also transmitted to the sorter 102 side, so that the image discharged to the purge tray 104 is copied again and stored in the bin 103 of the corresponding page as described with reference to FIG.

Although the image forming apparatus using the xerographic principle using the photoconductor drum has been described in the above-described embodiments and modified examples, it is possible to use other photoconductors such as a photoconductor belt. is there. Further, the present invention can be applied to an image forming apparatus that forms an image by another principle and transfers the image onto a sheet. Further, the present invention is
The same applies to an image forming apparatus that electrically or electronically performs image development processing and performs recording with a predetermined recording method based on the image development processing, for example, when dealing with an error during image development. be able to.

Further, in the embodiment, the image forming apparatus for transferring the image only on one side of the paper has been described for simplification of description. However, after transferring or recording the image on one side once, the same is performed on the other side. The present invention can also be applied to an image forming apparatus that transfers or records the image. In this case, images are formed on both sides of the paper in which the failure has occurred, and the paper is temporarily stopped before the image is processed.

In the embodiment, the timing of the paper is adjusted by combining the roller, the gate and the sensor.
Depending on the apparatus, the timing of the sheet conveyance may be adjusted by using another combination or a more simplified or complicated mechanism.

[0080]

As described above, according to the first aspect of the present invention, the occurrence of a failure affecting image formation is uniformly detected by the failure occurrence detecting means, and at the time of this detection, the recording of paper or the like is performed. I pretended that something was wrong. Therefore, since it is decided to re-form an image in which a failure may occur without complicating the control for detecting various abnormalities, it is possible to obtain a highly reliable printed matter or recorded matter with simple control. . Moreover, since the processing such as image formation on the apparatus side is executed without stopping, the apparatus can be effectively utilized.

According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the timing adjustment is performed when the conveyance of the sheet is temporarily stopped when the trouble occurs. Since the papers on the transport path on the upstream side of the means are also stopped at the same time, even if there are a plurality of papers already sent to the transport path, they are not wasted. Moreover, it is possible to obtain a highly reliable printed matter or recorded matter by using the re-formed image without stopping the recording control itself of the apparatus.

Further, according to the third aspect of the invention, when the image forming means forms a plurality of images in a predetermined order in such a manner that one sheet of paper corresponds to one page, the failure occurrence detecting means causes a failure. When the occurrence is detected, the sheet sent from the sheet supply source is temporarily stopped, and the image forming unit is made to form an image again from the same page as the image page formed when the failure occurs. ing. In addition, the sheet of the page on which the image is formed again and the sheet of the subsequent page on which the image has already been formed are discharged to a tray other than the regular discharge tray by the purge control. I have decided. For this reason, not only does the paper in the normally ejected path have no trouble, but the page order (including the ascending order, the descending order, or the predetermined page order in double-sided recording) is accurate. Of course, not all the papers once sent out from the paper feed tray are discarded, so the present invention also contributes to the reduction of the running cost of the image forming apparatus.

According to the invention described in claim 4, when the image forming apparatus connected to the sorter stores the sheets in the page order in the bin, the bin corresponding to the sheet in which the failure has occurred is skipped and each sheet is removed. If the sheets were sent to the sorter without being replaced and the image was formed again in response to the paper having the trouble, the sheets were stored later in the skipped bin.
As a result, not only can the sheets be taken out in page order, but the number of sheets actually discarded by the purge control can be further reduced, and efficient image formation can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a configuration of a printer of this embodiment as one form of an image forming apparatus.

FIG. 2 is a schematic configuration diagram showing a main part of a printing device section of the printer shown in FIG.

FIG. 3 is a schematic configuration diagram showing the periphery of a photosensitive drum of the printer shown in FIG.

FIG. 4 is an explanatory diagram showing a relationship of transport positions of respective sheets in the printer of this embodiment.

FIG. 5 is an explanatory diagram showing the first half of an example of paper conveyance control in the present embodiment.

FIG. 6 is an explanatory diagram showing the latter half of an example of paper conveyance control in the present embodiment.

FIG. 7 is a flowchart showing the contents of paper management control in the paper feed control unit of the printer of this embodiment.

FIG. 8 is an explanatory diagram showing the contents of a paper management table for managing each paper.

FIG. 9 is a flowchart showing the control contents of the paper discharge control unit of the printer of this embodiment.

FIG. 10 is a flowchart showing the control contents of the abnormality detection control unit of the printer of this embodiment.

FIG. 11 is a flowchart showing a control operation of a paper discharge control unit in the modified example of the invention.

FIG. 12 is a flowchart showing a control operation of a paper discharge control unit in this modified example.

FIG. 13 is a flowchart showing the control operation of the abnormality detection control section in this modification.

FIG. 14 is a flowchart showing a control operation of a sub-sign start control section of the copying machine in this modification.

[Explanation of symbols]

13 ... Printing control unit, 14 ... Printing unit, 25 ... First main control CPU, 31 ... Second main control CPU, 32 ... Printing device unit, 34 ... Second video control device, 41 ... Paper,
42 ... Paper feeding tray, 43 ... Photosensitive drum, 46 ... Paper discharging tray, 48, 104 ... Purge tray, 51 ... Registration gate, 52, 53 ... Registration roll, 54
... first paper sensor, 91 ... paper management table, 101
… Copier, 102… Sorter, 103… Bin

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G06F 3/12 G06F 3/12 M

Claims (4)

[Claims] 1. An image forming means for forming an image, a failure occurrence detecting means for detecting the occurrence of a failure affecting the image formation by the image forming means, and an image after the formation toward the image forming means. A paper supply source for supplying a paper for recording a sheet, and a timing adjustment arranged between the paper supply source and the image forming means for adjusting the timing when the paper sent from the paper supply source reaches the image forming means. Means, image forming re-execution means for causing the image forming means to re-form an image at the time of occurrence of a failure when the failure occurrence detecting means detects the occurrence of a failure, and the image forming re-execution means forms an image. An image forming apparatus comprising: a timing adjusting means control means for adjusting the timing adjusting means in accordance with the formation of an image to be performed again when the image forming apparatus is performed again. 2. An image forming means for forming an image, a failure occurrence detecting means for detecting the occurrence of a failure affecting the image formation by the image forming means, and an image after the formation toward the image forming means. A sheet supply source for supplying a sheet for recording a sheet, and a sheet disposed between the sheet supply source and the image forming unit, temporarily suspends the sheet sent from the sheet supply source, and restarts this at a predetermined timing. Timing adjusting means for adjusting the arrival timing of this sheet with respect to the image forming means by sending out, and when the failure occurrence detecting means detects the occurrence of a failure, the image forming means again forms an image when the failure occurs. And an image forming re-execution unit for causing the image forming re-execution unit to stop the sheet or the timing adjusting hand when the image forming re-executing unit re-forms an image. When the sheet before reaching the sheet is stopped at this timing adjusting means or at a predetermined position before this, the timing adjusting means for adjusting the timing of feeding the stopped sheet with respect to this image when the image is formed again An image forming apparatus comprising: a control unit. 3. An image forming means for forming images in a predetermined order on successive pages, each page corresponding to one sheet of paper, and an obstacle affecting the image formation by the image forming means. Is arranged between the paper supply source and the image forming means; a failure occurrence detecting means for detecting the occurrence of a paper; a paper supply source for supplying a paper for recording the formed image toward the image forming means; , A timing adjusting unit for temporarily stopping the sheet sent from the sheet supply source and sending the sheet again at a predetermined timing to adjust the timing at which the sheet reaches the image forming unit; and the failure occurrence detecting unit. Image formation re-execution means for causing the image forming means to form an image again from the same page as the page of the image formed at the time of occurrence of a failure when the occurrence of the failure is detected; When the image forming re-execution means re-forms an image, the timing adjusting means or the paper before reaching the timing adjusting means is stopped at the timing adjusting means or at a predetermined position before this. When the formation is performed again, the timing adjusting means control means for adjusting the timing of feeding the stopped paper to the image, and the paper before the timing readjustment by the timing adjusting means control means And a purge control means for discharging the paper on which the image after the page in which the failure occurrence is detected from the page where the failure is detected is discharged to a special tray as the paper other than the paper on which the normal recording is performed. Image forming apparatus. 4. An image forming means for forming an image in a predetermined order on successive pages, each page corresponding to one sheet of paper, and an obstacle affecting the image formation by the image forming means. Is arranged between the paper supply source and the image forming means; a failure occurrence detecting means for detecting the occurrence of a paper; a paper supply source for supplying a paper for recording the formed image toward the image forming means; , A timing adjusting unit for temporarily stopping the sheet sent from the sheet supply source and sending the sheet again at a predetermined timing to adjust the timing at which the sheet reaches the image forming unit; and the failure occurrence detecting unit. Image formation re-execution means for causing the image forming means to re-form the image of the same page as the image page formed when the failure occurs when the occurrence of the failure is detected; When the image forming re-execution unit re-forms an image, the timing adjusting unit or the sheet before reaching the timing adjusting unit is stopped at the timing adjusting unit or at a predetermined position before this. When the formation is performed again, the timing adjusting means control means for adjusting the timing of feeding the stopped paper to this image, and the paper before the timing readjustment by the timing adjusting means control means The paper on which the subsequent images are recorded, excluding the page in which the failure occurrence detecting means has detected the occurrence of the failure, is sequentially accommodated in the subsequent bins with the bin corresponding to the page in which the failure occurrence of the sorter is detected skipped. The first sorter bin control unit and the sheet of the page on which the image formation is performed again by the image formation re-execution unit, causes the failure to occur. An image forming apparatus, comprising: a second sorter bin control unit that stores a raw page in a bin corresponding to the detected page.