JP5212564B2 - Image forming apparatus, image forming apparatus control method, image forming apparatus control program, and recording medium - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine or a printer, and more particularly to an image forming apparatus that can cope with a failure such as a paper jam (jam), a control method for the image forming apparatus, a control program for the image forming apparatus, and a recording medium About.

  If there are overlaps or omissions in printed matter printed using a printer, it may affect corporate activities. For example, if a delivery slip is printed and there is a missing piece, the missing portion will not be delivered. In addition, if there is an overlap when the invoice is printed, the same invoice is made many times.

  Normally, printers perform printing processing in order, so that duplication and omission do not occur. However, printing may stop for some reason during printing. For example, when a paper jam (jam) occurs or when the power is turned off. In such a case, the paper on which the image is formed may not be completely discharged. Therefore, an operation for removing the paper remaining in the printer is performed. When the printing process is resumed, depending on the situation, the printer may reprint from the page where the failure has occurred or may reprint from the next page. This is because the printer normally determines which paper to resume printing based on a signal from a sensor that detects that the paper has passed. The sensor mounting position is determined for each printer model. Because it is different. Therefore, depending on the printer, the page that was being printed at the time of the failure is not always printed again, and duplication or omission occurs. Even when job management is performed by the print server, since processing is performed based on the output state of the paper ascertained by the printer, duplication and omission occur in the same manner.

In order to reduce duplication and omission, a technique for printing jam information and printing status when a jam occurs is disclosed (for example, see Patent Document 1 or Patent Document 2).
In the invention described in Patent Document 1, when a jam occurs, the jam information relating to the location where the jam occurred, the number of sheets printed before the jam occurs, and the page on which printing is to be resumed is recorded on the paper and output. .

  Further, in the invention described in Patent Document 2, when an abnormality occurs during printing, after performing recovery processing associated with the occurrence of the abnormality and before restarting the image forming operation, Outputs tabbed paper. Thereby, it is possible to grasp the position of the paper on which the jam has occurred with a large paper or a paper with a tab. Note that Patent Document 2 also describes printing and discharging job information.

  By the way, when a large amount of printing is performed, the printed matter may be carried to a work table and post-processing such as boxing or bookbinding may be performed. In this case, a basket-type stacker (discharge tray) may be used as a printer discharge destination in order to easily carry a large amount of printed material without collapsing the cargo. This stocker is partitioned by a partition plate or the like according to the size of the paper to be printed, so that the printed matter discharged from the printer is aligned. When printing using such a stocker, the technique described in Patent Document 2 discharges a sheet different from the sheet size of the printed material, making it difficult to align the printed material and easily causing a jam.

  Furthermore, when a large amount of printing is performed, it is difficult to find a printed portion from the printed matter after a jam occurs and temporarily stops. Therefore, as described in Patent Document 1, even if jam information is acquired, it is difficult to specify a printed portion that may be duplicated or missing. For example, even when 2000 sheets of paper are printed, a jam occurs once, and even if job information related to the relevant part is acquired from the 2000 sheets, the job information from the 2000 sheets is obtained. It is difficult to specify the location.

  Further, in the technologies described in Patent Document 1 and Patent Document 2, in order to grasp the position of the paper on which the jam has occurred using a paper on which jam information is recorded, a large paper, or a paper with a tab, these papers are used. There was also a problem that wasted.

  The present invention has been made in view of the above-described problems, and even when a large amount of printed matter is printed, it is possible to efficiently identify paper resumed after a failure occurs during printing, and overlap the printed matter. An object of the present invention is to provide an image forming apparatus, a method for controlling the image forming apparatus, a control program for the image forming apparatus, and a recording medium.

In order to solve the above problems, the invention according to claim 1 is directed to image forming means for forming an image on a sheet based on image forming data for which an output request has been received, and an image based on the image forming data. a history recording means for detecting formation of occurrence of faulty Te 1 jobs during operation odor until completion of or store recovery times in which the detection of elimination of the fault, the sheet on which an image is formed by the image forming means When a failure occurs during the operation until the completion of the image formation based on the first output means for outputting and the image formation data, an image is formed by the image forming means when the failure is detected. a second output means for inverting and outputting the paper was a second reversal to the output means to count the number of the output sheets, the recovery times this number is stored in the history recording means When match is output to stop the second output means, and summarized in that and an output switching means for outputting by the first output means.

According to a second aspect of the invention, in the image forming apparatus according to claim 1, based on the recovery times, the fault that has occurred during the operation up to the formation of an image is completed based on the image formation data In this case, the image forming apparatus further includes first print end control means for inverting and outputting at least the paper on which image formation was last performed during image formation based on the image formation data.

According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect, the printed matter detection sensor that detects whether or not paper is present in the paper discharge tray, and when the power-on is detected, The gist of the present invention is that it further comprises power-on control means for inverting and outputting at least the first sheet when a sheet is present in the sheet discharge tray based on a signal from the print detection sensor.

According to a fourth aspect of the present invention, there is provided an image forming means for forming an image on a sheet based on the image forming data for which the output request has been received, and one job until the image formation based on the image forming data is completed. a control method for a history recording means for storing the restored number of times of the detection of the cancellation of the detection or the failure of the generation of the operation in the disabled Te smell harm, the image forming apparatus and control means, said control means The first output stage for outputting the paper on which the image is formed by the image forming means, and detection of the elimination of the trouble after the trouble occurs during the operation until the image formation based on the image formation data is completed. If you, the counting and the second output stage inverts and outputs the sheet on which an image is formed by the image forming means, the number of sheets which is inverted output at the second output stage, the number If it matches the history recording means to the stored recovery number, and summarized in that executing the stops the output of the second output stage, and an output switching stage to output by said first output stage To do.

According to a fifth aspect of the present invention, there is provided an image forming unit for forming an image on a sheet based on image forming data for which an output request has been received, and one job until image formation based on the image forming data is completed. a history recording means for storing the restored number of times of the detection of the cancellation of the detection or the failure of the generation of the operation in the disabled Te smell harm, there is provided a control program of the image forming apparatus and control means, said control means The first output means for outputting the paper on which the image is formed by the image forming means, and after the failure occurs during the operation until the image formation based on the image formation data is completed, the elimination of the failure is detected. If, counts the number of the second output means, and the sheet which is reversed and outputted by the second output means for inverting and outputting the sheet on which the image is formed by said image forming means, the If the number matches the recovery count stored in said history recording means, summarized in that the output of the second output means is stopped, to function as an output switching means for outputting by the first output means And

According to a sixth aspect of the present invention, there is provided an image forming unit for forming an image on a sheet based on the image forming data for which the output request has been received, and one job until image formation based on the image forming data is completed. a recording medium recording a control program of an image forming apparatus having a history recording means for storing the detection or recovery times in which the detection of elimination of the fault occurrence of operation in impaired Te odor harm, and control means The control means, the first output means for outputting the paper on which the image is formed by the image forming means, and the failure after the failure occurs during the operation until the image formation based on the image formation data is completed. If eliminated detects the, number of the second output means, and said second output means paper is inverted and output by which invert and output sheet on which an image is formed by said image forming means Counting, if this number is matched and recovery count stored in said history recording means, the output is stopped in the second output means, function as an output switching means for outputting by the first output means The gist of the present invention is that it can be read by a computer recording a control program to be executed.

(Function)
According to the present invention, when detecting the resolution of the failure and restarting the image forming apparatus, the control unit controls the reversing mechanism unit to reverse and output at least the first sheet that has been resumed. For this reason, since the sheet immediately after resuming the image forming operation can be grasped by the sheet whose front and back are reversed, it is possible to easily identify a place where there is a possibility of overlap or missing. Further, since the restarted location is specified by the paper on which the image to be printed is formed without using other paper, this paper can also be used as a printed matter, and the waste of paper can be reduced.

  According to the present invention, the control unit records the first flag in the first flag data storage unit when a failure occurs or when the image forming operation is resumed. When the first flag is recorded in the first flag data storage unit, the control unit controls the reversing mechanism unit to invert and output the last sheet. For this reason, it is possible to easily grasp whether or not a failure has occurred during the printing only by looking at the orientation of the last sheet. Therefore, even when a large amount of printing is performed, it is possible to easily grasp whether or not a failure has occurred during printing.

  According to the present invention, the control unit counts the number of times that the image forming operation is resumed. Then, for the number of sheets corresponding to this number from the end, the printed matter is reversed and output. For this reason, it is possible to grasp the number of failures that occurred during printing on a sheet preceding the sheet from the number of sheets that are subsequently reversed. Accordingly, it is possible to further reduce oversight of overlap and omission.

  According to the present invention, when the power supply is detected, the control unit reverses and outputs at least the first sheet based on a signal from the printed matter detection sensor if there is a sheet in the sheet discharge tray. . Depending on the failure that occurred during printing, it is necessary to turn off the power supply temporarily. In this case, information on how far the printing has been performed may be lost. Therefore, if the paper is already in the paper discharge tray when the power is turned on, the position where the image forming operation is resumed can be efficiently identified by inverting the first paper and outputting it. .

  According to the present invention, the control means records the second flag in the second flag data storage means when the power is turned on. When the second flag is recorded in the second flag data storage unit, the control unit controls the reversing mechanism unit to reverse and output at least the last sheet. For this reason, even when a large amount of printing is performed, it can be determined from the direction of the last sheet of the printed matter that has been printed whether or not the power is turned on during printing of the printed matter.

  According to the present invention, even when a large amount of printed matter is printed, it is possible to efficiently identify paper resumed after a failure occurs during printing, and to reduce duplication and omission in the printed matter.

1 is a schematic diagram of a system in an embodiment. Explanatory drawing explaining the process sequence of a recovery start control process and a printing end control process. Explanatory drawing explaining the state of the printed matter output. Explanatory drawing explaining the process sequence of the power-on control process of a control part.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, a client terminal 10 and a printer 20 as an image forming apparatus are connected via a network N.

  The client terminal 10 is a terminal used by a worker who instructs printing. The client terminal 10 includes a display, a keyboard, a pointing device, and the like. On the display, a screen related to the contents of the form to be printed is displayed. Using the keyboard and pointing device, the operator instructs the client terminal 10 to input data and execute printing. The client terminal 10 generates print data as image formation data based on a print execution instruction from an operator, and transmits the print data to the printer 20. Further, when the client terminal 10 waiting for a print end signal receives a request for print data from the printer 20 whose power has been turned on again, the client terminal 10 transmits the generated print data to the printer 20.

  On the other hand, the printer 20 includes a control unit 21 as a control means, an operation panel unit 22, an image forming unit 23, a paper transport unit 24, a job management unit 25, a data storage unit 26, a transport path paper detection sensor 27, and a cover open detection sensor. 28 and a stocker paper detection sensor 29. The operation panel unit 22, the image forming unit 23, the paper transport unit 24, the job management unit 25, and the data storage unit 26 are controlled by the control unit 21 and execute various processes described later. The conveyance path paper detection sensor 27, the cover open detection sensor 28, and the stocker paper detection sensor 29 supply various signals to be described later to the control unit 21. The printer 20 is provided with a power switch. When the power switch is turned on, the power is turned on to supply power to the units (21 to 26) and the sensors (27 to 29).

  The control unit 21 includes a CPU, a RAM, a ROM, and the like, and transmits and receives data to and from the client terminal 10. The control unit 21 performs processing described later (processing including a recovery start control stage, a first print end control stage, a second print end control stage, and a power-on control stage). For this reason, the control unit 21 of the present embodiment functions as a control unit for normal printing processing, and by executing a control program read from the recording medium, when a failure such as a jam occurs, a recovery start control unit or a print end Functions as control means and power-on control means.

In the recovery start control process, the recovery start control means records a recovery flag as will be described later, and executes a reverse output printing process.
The print end control means functions as a first print end control means and a second print end control means. This print end control means determines the presence or absence of a recovery flag. If the recovery flag is recorded, the last sheet is output in reverse and the recovery flag is cleared.

  The power-on control means determines whether or not there is a sheet output to the stocker 30 serving as a paper discharge tray when power-on is detected. If there is a sheet in the stocker 30, the recovery flag is recorded and the reverse output printing process is executed.

  The operation panel unit 22 includes a display unit including a touch panel display and an operation unit having various operation buttons (for example, a start button). The control unit 21 performs display regarding the location where the jam has occurred on the display unit, or receives an instruction from the operator via the display unit or the operation unit.

  The image forming unit 23 is a unit that functions to perform image formation in accordance with a control signal from the control unit 21. The image forming unit 23 includes a photosensitive drum, a charger, a laser scanner, a developing device, a static eliminator, a transfer roll, a cleaner, a fixing device, and the like. The image forming unit 23 operates the charger to uniformly charge the surface of the photosensitive drum, operates the laser scanner, irradiates the charged surface of the photosensitive drum with a laser beam, and electrostatic latent The image is written, the developing device is driven, and the formed electrostatic latent image is developed with toner or the like. Further, the image forming unit 23 drives the transfer roll to transfer the developed toner image onto the paper, and drives the fixing device to heat and press the paper to fix the toner image on the paper. The static eliminator removes unnecessary charges on the surface of the photosensitive drum. The cleaner removes unnecessary toner remaining on the surface of the photosensitive drum without being transferred.

  The paper transport unit 24 is a unit that functions to transport paper in accordance with a control signal from the control unit 21. The sheet transport unit 24 includes a plurality of rollers and the like. The sheet transport unit 24 acquires sheets one by one from the sheet feeding tray and introduces them into the image forming unit 23, and then prints the printed matter on which the image is formed in the image forming unit 23. Transport outside the discharge port. Further, the paper transport unit 24 includes a reversing mechanism for reversing the front and back of the paper. The reversing mechanism section reverses the front and back of the paper by guiding the paper on which the image has been formed to a switchback in the middle of the paper transport path and changing the transport direction of the paper.

  A basket-type stocker 30 is installed at the discharge port of the printer 20 of the present embodiment. The stocker 30 has a space that matches the size of the paper. Then, when the printed sheets are discharged from the discharge port and stored in the stocker 30, they are aligned and stacked.

  The job management unit 25 is a unit that stores and manages job information. This job information is information regarding print data acquired from the client terminal 10 via the control unit 21. The job information includes not only the image data constituting the print data but also, for example, the number of sheets to be formed and the number of copies.

  The data storage unit 26 stores various data and information necessary for the control unit 21 to execute the image forming process. The data storage unit 26 functions as first flag data storage means and second flag data storage means, and records a recovery flag. The recovery flag is a flag for indicating that the jam has been removed or that the paper is stored in the stocker 30 when the power is turned on, and functions as a first flag and a second flag.

Further, in this embodiment, cover opening instruction data and reverse output number data at the time of restoration are recorded.
The cover opening instruction data is data for instructing a cover to be opened. The cover opening instruction data is associated with an identifier that identifies each conveyance path sheet detection sensor 27. Using this opening instruction data, the control unit 21 can specify the cover corresponding to the jam occurrence location according to the conveyance path paper detection sensor 27 that supplied the paper detection signal.

  The reverse output number data at the time of recovery is data relating to the number of sheets to be output (reverse output number at the time of recovery) in a state where the front and back sides are reversed in a recovery start control process and a power-on control process described later. In this embodiment, “5” is used as the reverse output number at the time of restoration.

  The conveyance path sheet detection sensor 27 is a sensor that detects the presence or absence of a sheet, and is provided at a plurality of predetermined locations on the sheet conveyance path. The conveyance path sheet detection sensor 27 supplies a sheet detection signal to the control unit 21 when a sheet passes on the sheet conveyance path. The control unit 21 detects the passage timing of the end of the sheet on the sheet conveyance path based on the sheet detection signal of the conveyance path sheet detection sensor 27. Further, the control unit 21 detects that a jam has occurred when the passage timing exceeds a predetermined time set in advance. Further, when the supply of the cover open detection signal of the cover open detection sensor 28 is stopped and the paper detection signal from the conveyance path paper detection sensor 27 is not supplied, the control unit 21 removes the occurrence of the jam. Is detected.

  The cover opening detection sensor 28 is a sensor that detects opening of the cover of the printer 20. The cover opening detection sensor 28 is provided in the vicinity of each cover that covers the front surface, the side surface, and the like. Each cover open detection sensor 28 supplies a cover open detection signal to the control unit 21 when the corresponding cover is opened. Further, when the supply of the cover open detection signal is stopped, the control unit 21 determines that the cover associated with the cover open detection sensor 28 is closed.

  The stocker paper detection sensor 29 is a printed matter detection sensor that detects that paper is stored in the stocker 30. The stocker sheet detection sensor 29 supplies a printed matter detection signal to the control unit 21 when a sheet printed on the stocker 30 installed at the discharge port already exists.

Next, a method for controlling the image forming apparatus according to the present embodiment will be described with reference to FIGS.
First, the operator operates the client terminal 10 to specify a print target and give a print instruction. The client terminal 10 generates print data based on the identified target data and transmits the print data to the printer 20 via the network N.

  The printer 20 sequentially records the received print data in the job management unit 25. Then, the printer 20 executes normal print processing based on the print data stored in the job management unit 25. In this case, the control unit 21 drives the sheet conveying unit 24 to introduce the sheets one by one from the sheet feeding tray to the image forming unit 23. Then, the control unit 21 drives the image forming unit 23 to perform an image forming operation, and forms an image on the introduced paper. During this time, the control unit 21 monitors the occurrence of a jam based on the passage timing based on the conveyance path sheet detection sensor 27. Then, the control unit 21 drives the paper transport unit 24 to transport the paper (printed material) on which the image is formed by the image forming unit 23 to the stocker 30. The printed material is stacked in the stocker 30.

(Jam generation processing)
Here, it is assumed that a paper jam (jam) occurs in the printer 20 during such printing processing. Specifically, the control unit 21 of the printer 20 detects that a jam has occurred when the paper passage timing based on the paper passage detection signal exceeds a predetermined time.

  Thereby, the control part 21 performs a jam generation process. Specifically, the control unit 21 first stops the driving of each member of the image forming unit 23 and the sheet conveying unit 24 to interrupt the printing process.

  Next, the control unit 21 reads job information from the job management unit 25, generates a job history using the job information, and records it in the data storage unit 26. The job history includes the progress status of the job interrupted due to the occurrence of the jam, the image data of the page on which the image forming unit 23 was performing the image forming operation when interrupted, and the image data before and after this page. It is. Note that the job history recorded in the data storage unit 26 is used to restart the image forming operation.

  Then, the control unit 21 displays an error display screen indicating the occurrence of a jam on the display unit of the operation panel unit 22. Specifically, the control unit 21 specifies the location on the paper conveyance path where the occurrence of the jam is determined by the paper passage detection signal. Then, the cover corresponding to this location is specified using the cover opening instruction data in the data storage unit 26. Next, the control unit 21 displays on the display unit of the operation panel unit 22 an error display screen for opening the identified cover and instructing the removal of the jam. Thus, the jam generation process ends.

(Recovery start control process)
Here, the recovery start control process (S1-1 to S1-4) shown in FIG. 2 will be described.
The operator who has viewed the error display screen opens the cover corresponding to the jam occurrence location displayed on the operation panel unit 22. In this case, the cover open detection sensor 28 supplies a cover open detection signal to the control unit 21. Then, the operator removes the jammed paper from the printer 20 and closes the opened cover. In this case, the cover open detection sensor 28 stops supplying the cover open detection signal.

  At this time, if no paper detection signal is supplied from all the conveyance path paper detection sensors 27, the control unit 21 detects that the jam has been removed (step S1-1). Then, the control unit 21 displays on the display unit of the operation panel unit 22 to instruct to press the start button for resuming the printing process.

  Next, the control unit 21 records a recovery flag (step S1-2). Specifically, the recovery start control unit of the control unit 21 records in the data storage unit 26 a flag indicating that a jam has occurred during the printing process. Further, the recovery start control means reads the job history recorded in the data storage unit 26 to the job management unit 25.

  Thereafter, when the start button is pressed, the control unit 21 resumes the printing process interrupted due to the occurrence of a jam. Specifically, the control unit 21 compares the read job history with the print data recorded in the job management unit 25 and restarts the printing process. At this time, according to the location on the paper conveyance path where the occurrence of the jam is determined, the control unit 21 from the paper including the page on which the printing process was performed when the jam occurred or from the paper including the next page of this page, Resume the printing process.

  Then, the control unit 21 executes reverse output printing processing (step S1-3). Specifically, the recovery start control means of the control unit 21 generates a reversal control signal for performing control for reversing the paper. Here, similarly to the normal printing process, the control unit 21 performs an image forming operation based on the print data on the paper taken out from the paper feed tray. Then, the control unit 21 to which the reversal control signal is supplied drives the paper transport unit 24 to transport the image-formed paper (printed material) to the switchback, reverses the front and back directions, and discharges it to the stocker 30.

  At this time, the recovery start control unit of the control unit 21 counts the number of sheets discharged from the discharge port based on the sheet detection signal from the conveyance path sheet detection sensor 27. The paper discharged by this reverse output printing process is stored in the stocker 30 with the front and back sides reversed.

  Then, when the counted number of sheets has reached the reverse output number at the time of recovery recorded in the data storage unit 26, the recovery start control means stops the reverse control signal. Thereby, the control unit 21 ends the reverse output printing process. Specifically, the recovery start control means of the control unit 21 ends the generation of the inversion control signal. As a result, the control unit 21 executes normal printing processing for the remaining pages (step S1-4). Specifically, the control unit 21 drives the paper transport unit 24 and the image forming unit 23 based on the print data, and executes the remaining print processing. In this case, the control unit 21 discharges the sheet on which the image has been formed by the image forming unit 23 to the stocker 30 as it is without conveying it to the switchback. As a result, the paper on which the following pages are printed is stacked on the stocker 30 in the same direction as the printed material before the jam occurs on the five papers whose front and back are reversed.

  As described above, the control unit 21 of the printer 20 repeatedly performs the jam generation process and the recovery start control process every time a jam occurs during the printing process. Then, the control unit 21 of the printer 20 executes the next print end control process when the last paper image is formed.

(Printing end control process)
Next, the print end control process (S2-1 to S2-5) shown in FIG. 2 will be described.
When forming an image for the last page of the print data (step S2-1), the control unit 21 determines whether a recovery flag is recorded (step S2-2). Specifically, the printing end control unit of the control unit 21 checks whether or not a recovery flag is recorded in the data storage unit 26. Here, when the recovery flag is not recorded (in the case of “NO” in step S2-2), the control unit 21 executes normal output (step S2-3). Specifically, the control unit 21 discharges the paper on which the image of the last page has been formed to the stocker 30 without conveying it to the switchback. In this case, the printed matter stored in the stocker 30 is stacked with all the front and back sides aligned because no jam occurred during the printing process.

  On the other hand, when the recovery flag is recorded (in the case of “YES” in step S2-2), the control unit 21 executes the reverse output process (step S2-4). Specifically, the print end control unit of the control unit 21 supplies an inverted output instruction signal to the control unit 21. The control unit 21 conveys the last sheet to the switchback, inverts the front and back, and then discharges it to the stocker 30. In this case, the printed matter stored in the stocker 30 is stacked in a state in which the front and back of the sheet immediately after the resumption of printing and the last sheet are reversed because a jam has occurred during the printing process.

Then, the print end control means clears the recovery flag recorded in the data storage unit 26 (step S2-5). Thus, the print end control process ends.
Thereafter, the control unit 21 executes a print completion process. Specifically, an end signal indicating that the printing process has ended is transmitted to the client terminal 10 that has transmitted the print instruction. Further, the print data used for the printing process is deleted from the job management unit 25.

  Thereafter, the operator acquires the printed material stored in the stocker 30. Here, as shown in FIG. 3, when the front and back of the last sheet of the printed matter are reversed, the operator grasps the occurrence of jam during the printing process of the printed matter, and Search for paper with reversed. When the operator extracts a sheet whose front and back sides are reversed, it is confirmed whether or not there is a sheet that overlaps or is missing before and after this sheet. If there are overlapping sheets, the sheets are removed, and if there are missing sheets, the missing pages are printed. In addition, when there are no overlapping sheets or missing sheets, the operator changes the orientation of the printed matter whose front and back sides are reversed and reinserts the printed matter.

(Power-on control process)
Next, the power-on control process in the printer 20 will be described with reference to FIG. This power-on control process is performed when the power is turned on, for example, after the power is temporarily turned off because of a failure during the printing process. When the power is turned off, the data recorded in the job management unit 25 is deleted.

  When the operator turns on the power switch, the control unit 21 is turned on (step S3-1). In this case, power is supplied to each unit (21 to 26) and each sensor (27 to 29), and the control unit 21 detects power-on and performs a reset process (step S3-2). Specifically, for example, when the image forming unit 23 is in the middle of processing, the control unit 21 drives a cleaner or a static eliminator to end the image forming operation.

  Next, the control unit 21 acquires print data from the client terminal 10 (step S3-3). Specifically, the control unit 21 transmits an inquiry as to whether or not the client terminal 10 connected via the network N is waiting for a print end signal. In response to this, the client terminal 10 waiting for the end signal transmits the print data to the printer 20 again. Then, the control unit 21 of the printer 20 records the received print data in the job management unit 25.

  Next, the control unit 21 determines whether or not a sheet that has already been discharged is contained in the stocker 30 (step S3-4). Specifically, the power-on control means of the control unit 21 determines whether or not paper is in the stocker 30 based on the printed matter detection signal from the stocker paper detection sensor 29.

Here, when there is no paper in the stocker 30 (in the case of “NO” in step S3-4), the control unit 21 executes normal printing processing (step S3-5).
On the other hand, when the power is turned on after a failure occurs during the printing process and the power is turned on, since the printing process is performed halfway, the printed matter discharged until the power is turned off is stored in the stocker 30. In. Therefore, when there is a sheet in the stocker 30 (in the case of “YES” in step S3-4), first, the control unit 21 records a recovery flag as in step S1-2 (step S3). -6).

  Next, the control unit 21 executes the reverse output printing process in the same manner as in step S1-3 (step S3-7). Specifically, the power-on control means of the control unit 21 generates an inversion control signal. The control unit 21 supplied with the inversion control signal drives the paper transport unit 24 to transport the image-formed paper (printed material) to the switchback, reverses the front and back directions, and discharges the paper to the stocker 30. Here again, the power-on control means counts the sheets discharged from the discharge port, and stops the reverse control signal when the number of discharged sheets reaches the reverse output number at the time of restoration. Accordingly, the five sheets output immediately after the printing process is resumed are accommodated in the stocker 30 with the front and back sides reversed.

  And the control part 21 performs a normal printing process about the remaining pages (step S3-5). Specifically, the control unit 21 drives the paper transport unit 24 and the image forming unit 23 based on the print data recorded in the job management unit 25 and executes the printing process for the remaining pages. In this case, the control unit 21 discharges the sheet on which the image has been formed by the image forming unit 23 to the stocker 30 as it is without conveying it to the switchback. As a result, sheets of normal orientation are stacked on the stocker 30 on the five sheets that have been turned upside down and discharged immediately after the power is turned on.

  In this case, since the recovery flag is recorded (“YES” in step S2-2), the print end control unit of the control unit 21 executes the reverse output process for the last page (step S2-4). . As a result, when the power is turned on while there is a sheet printed on the stocker 30, the front and back sides of the sheet of the last discharged page are reversed.

According to this embodiment, the following effects can be obtained.
In this embodiment, when it is detected that the jam has been removed (step S1-1), the control unit 21 records a recovery flag (step S1-2), and when the printing process is resumed, reverse output printing is performed. Processing is executed (step S1-3). And the control part 21 performs a normal printing process about the remaining paper (step S1-4). For this reason, when the jam is removed and the printing process is resumed, the printed matter whose front and back sides are reversed is accommodated in the stocker 30. Therefore, when the worker searches for the reversed paper and extracts the paper whose front and back sides are reversed, the operator checks whether there is any overlapping or missing paper before and after this paper. It can be done easily. Accordingly, the location where the printing process is resumed can be efficiently identified from the paper whose front and back sides are reversed, so that duplication and omission of paper can be reduced. Further, since the location where the printing process is resumed is specified using the paper on which the original printing was performed without using other paper, the paper can be used efficiently. Furthermore, since it is only necessary to add a process of inverting and outputting the printed paper, the print data received from the client terminal 10 can be used as it is without any processing.

  In the present embodiment, the data storage unit 26 stores “5” as the reverse output number at the time of restoration. When executing the reverse output printing process (step S1-3), the control unit 21 ends the reverse output printing process when the number of sheets counted by the recovery start control unit matches the reverse output number at the time of recovery. Normal printing processing is performed (step S1-4). As a result, the continuous five sheets are stacked with the front and back sides reversed, so that it is difficult to overlook the sheets with the front and back sides reversed.

  In the present embodiment, the control unit 21 is turned on (step S3-1), acquires print data (step S3-3), and then has a sheet output to the stocker 30 (step S3-). In the case of “YES” in 4), the reverse output printing process is executed (step S3-7). For this reason, when the power is turned on and printing processing is performed in a state where there is a sheet printed on the stocker 30, the sheet immediately after the power is turned on is in an inverted state. Therefore, it is possible to efficiently identify the boundary between paper that has been printed before the power is turned off and paper that has been printed after the power is turned off and then turned on again. Can be reduced.

  In the present embodiment, when it is detected that the jam has been removed (step S1-1), the control unit 21 records a recovery flag (step S1-2). When the printing process for the last sheet is completed (step S2-1) and the recovery flag is recorded (in the case of “YES” in step S2-2), the control unit 21 executes the reverse output. (Step S2-4). Further, when the power is turned on (step S3-1) and there is a sheet output to the stocker 30 (in the case of “YES” in step S3-4), the control unit 21 records a recovery flag ( Step S3-6). In this case, since the recovery flag is recorded (“YES” in step S2-2), when the printing process for the last sheet is performed (step S2-1), the control unit 21 executes the reverse output. (Step S2-4). For this reason, it is possible to grasp that a jam has occurred or the power is turned on again in the middle of a bundle of printed matter by just looking at the direction of the last sheet. Therefore, it is possible to easily grasp whether or not it is necessary to check for overlapped or missing sheets in the printed matter.

Moreover, you may change the said embodiment as follows.
In the embodiment described above, the data storage unit 26 stores in advance reverse output number data at the time of restoration relating to the number of sheets to be output with the front and back sides reversed. Alternatively, the number of sheets to be reversed (the number of reversed output sheets at the time of restoration) may be changed according to the situation. For example, the control unit 21 may determine the number of sheets for reversing the front and back according to the number of jams that occurred during the printing process. In this case, the number of times of recovery is recorded as a recovery flag. Specifically, when the recovery flag is recorded (steps S1-2 and S3-6), the recovery start control unit of the control unit 21 acquires the number of times of recovery already recorded in the data storage unit 26. Then, the recovery start control means calculates a new number of times of recovery by adding “1” to the number of times of recovery, and updates and records the number of times of recovery in the data storage unit 26. Then, the restoration start control unit of the control unit 21 executes the reverse output printing process until the counted number of sheets matches the number of sheets corresponding to the calculated number of restorations (step S1-3). Accordingly, it is possible to grasp the number of jams that have occurred during the printing process for a sheet printed before this sheet, according to the number of continuous sheets with the front and back reversed. Accordingly, it is possible to further reduce oversight of overlap and omission.

  Further, the print end control means of the control unit 21 may reverse not only the last sheet but also the sheet on which an image is formed immediately before. In this case, the number to be reversed may be set in advance or may be changed according to the situation. For example, the number of sheets to be reversed may be determined according to the number of jams that occurred during the printing process. In this case, the number of times of recovery is recorded as a recovery flag. Then, the print end control means of the control unit 21 acquires the number of times of restoration every time an image is formed on a new sheet. The print end control means calculates the number of pages obtained by subtracting the acquired number of restorations from the number of printed sheets included in the job information. The printing end control means counts the number of sheets discharged from the discharge port based on the sheet detection signal. Then, the print end control means supplies a reverse output instruction signal to the control unit 21 so as to perform reverse output processing on all sheets output after the counted number of sheets coincides with the calculated page number. Then, when the last page is inverted and output, the control unit 21 sets the number of restorations to “0”. Accordingly, it is possible to grasp the number of jams that occurred during the printing process in accordance with the number of sheets whose front and back sides are reversed in the last portion of the printed matter.

  In the above embodiment, the control unit 21 guides the paper on which the image is formed by the image forming unit 23 to the reversing mechanism unit, and outputs the paper after reversing the front and back. Instead, the control unit 21 may generate image data obtained by rotating the image 180 degrees immediately after the jam is removed, and cause the image forming unit 23 to perform image formation based on the image data. . In this case, even in the printer 20 that is not provided with the reversing mechanism, immediately after the jam, the paper whose image orientation is rotated by 180 degrees is output. Therefore, when a paper whose orientation of the image is rotated by 180 degrees is searched, it can be confirmed whether there is a paper that overlaps or is missing before and after this paper. Further, a partition paper as a mark may be inserted immediately after the jam is removed. In this case, a paper feed tray or partition paper is prepared, and the control unit 21 discharges the partition paper immediately after the jam. In this case, colored paper can also be used as the partition paper. In addition, a sheet on which printing is performed so as to fill the entire surface or the peripheral edge of the sheet obtained from the sheet feeding tray may be used as the partition sheet. The occurrence of a jam can also be specified by these partition sheets, and overlapping or missing sheets can be confirmed.

  In the above embodiment, when it is detected that the jam has been removed (step S1-1), the control unit 21 records a recovery flag (step S1-2). Alternatively, the recovery flag may be recorded when a jam occurs.

  In the above embodiment, the control unit 21 deletes the data recorded in the job management unit 25 when the power supply is once turned off. Therefore, when the power is turned on (step S3-1), the control unit 21 performs a reset process (step S3-2), acquires print data (step S3-3), and prints based on the print data. Processing was performed. The present invention is not limited to this, and when the print data recorded in the job management unit 25 remains without being deleted after the power is turned off, the subsequent print processing may be performed based on the print data. Good. Specifically, after performing the reset process (step S3-2), the control unit 21 determines whether print data remains in the job management unit 25. If no print data remains, the print data is acquired (step S3-3), and the subsequent processing is executed. On the other hand, if print data remains in the job management unit 25, print processing is executed based on this print data. In this case, similarly to the recovery start control process, a recovery flag is recorded (step S1-2), and the first sheet is reversed and output (step S1-3). As a result, if print data remains, even if the power is turned off, the printing process can be continued. Accordingly, it is possible to reduce printing of overlapping sheets.

  In the above embodiment, a jam has been described as a specific example as an obstacle during an image forming operation. The present invention is not limited to this, and the present invention can be similarly applied to other failure occurrences such as when a failure occurs due to toner exhaustion or data transmission / reception.

  DESCRIPTION OF SYMBOLS 10 ... Client terminal, 20 ... Printer as image forming apparatus, 21 ... Control part as control means, 23 ... Image forming part, 24 ... Paper conveyance part, 26 ... 1st flag data storage means and 2nd flag data storage means A data storage unit, 29... Stocker paper detection sensor as a printed matter detection sensor, 30... Stocker as a paper discharge tray.

Japanese Patent Laying-Open No. 2003-29580 (FIG. 1) JP 2006-71709 A (FIGS. 5 to 7)

Claims (6)

An image forming unit for forming an image on a sheet based on the image forming data for which the output request has been received;
A history recording means for storing the restored number of times of the detection of the cancellation of the detection or the fault of the occurrence of faulty Te 1 jobs during operation odor to the formation of the image is completed based on the image formation data,
First output means for outputting the paper on which the image is formed by the image forming means;
After a failure occurs during the operation until the image formation based on the image formation data is completed, when the removal of the failure is detected, the paper on which the image is formed is reversed and output. Two output means;
The number of sheets output by being inverted by the second output means is counted, and when the number of sheets coincides with the number of restorations stored in the history recording means, the output of the second output means is stopped. An image forming apparatus comprising: an output switching unit configured to output the first output unit. When it is determined that the failure has occurred during the operation until the image formation based on the image formation data is completed based on the number of times of restoration , at least of the image formation based on the image formation data The image forming apparatus according to claim 1, further comprising a first print end control unit that inverts and outputs the paper on which image formation has been performed last. A printed matter detection sensor for detecting whether or not paper is present in the paper discharge tray;
And a power-on control means for reversing and outputting at least the first sheet when there is a sheet in the sheet discharge tray based on a signal from the printed matter detection sensor when power-on is detected. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. An image forming unit for forming an image on a sheet based on the image forming data for which the output request has been received;
A history recording means for storing the restored number of times of the detection of the cancellation of the detection or the fault of the occurrence of faulty Te 1 jobs during operation odor to the formation of the image is completed based on the image formation data,
A control method of an image forming apparatus comprising a control means,
The control means is
A first output stage for outputting a sheet on which an image is formed by the image forming unit;
After a failure occurs during the operation until the image formation based on the image formation data is completed, when the removal of the failure is detected, the paper on which the image is formed is reversed and output. Two output stages;
In the second output stage, the number of sheets that are reversed and output is counted, and when the number matches the number of restorations stored in the history recording means, the output in the second output stage is stopped. And executing an output switching step of outputting in the first output step. An image forming unit for forming an image on a sheet based on the image forming data for which the output request has been received;
A history recording means for storing the restored number of times of the detection of the cancellation of the detection or the fault of the occurrence of faulty Te 1 jobs during operation odor to the formation of the image is completed based on the image formation data,
A control program for an image forming apparatus comprising a control means,
The control means;
First output means for outputting the paper on which the image is formed by the image forming means;
After a failure occurs during the operation until the image formation based on the image formation data is completed, when the removal of the failure is detected, the paper on which the image is formed is reversed and output. Two output means, and
The number of sheets output by being inverted by the second output means is counted, and when the number of sheets coincides with the number of restorations stored in the history recording means, the output of the second output means is stopped. And causing the first output means to function as an output switching means. An image forming unit for forming an image on a sheet based on the image forming data for which the output request has been received;
A history recording means for storing the restored number of times of the detection of the cancellation of the detection or the fault of the occurrence of faulty Te 1 jobs during operation odor to the formation of the image is completed based on the image formation data,
A recording medium on which a control program of an image forming apparatus including a control unit is recorded,
The control means;
First output means for outputting the paper on which the image is formed by the image forming means;
After a failure occurs during the operation until the image formation based on the image formation data is completed, when the removal of the failure is detected, the paper on which the image is formed is reversed and output. Two output means, and
The number of sheets output by being inverted by the second output means is counted, and when the number of sheets coincides with the number of restorations stored in the history recording means, the output of the second output means is stopped. A computer-readable recording medium having recorded thereon a control program that functions as output switching means for output by the first output means.

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