Image formation device

Abstract

To provide an image formation device capable of easily confirming a print page which should have been printed on paper being double fed.SOLUTION: An image formation device comprises: a conveying part for sequentially conveying a plurality of sheets; a printing part for printing a plurality of print pages on the plurality of sheets, respectively; a double feeding detection part for detecting occurrence of double feeding to paper included in the plurality of sheets; and a notification part for notifying error information that may identify a print page that should have been printed on the paper being double fed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an image forming apparatus. [Background technology]

[0002] Patent document 1 discloses an image forming apparatus including an image reading means for reading an image of a document placed on a document placing section, an image forming means for forming the read image on a transfer material, a document feeding device for sequentially sending multiple images to the image placing section, and a control means for stopping the operation of the document feeding device and the image forming means when duplicate document feeding occurs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-85647 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in Patent Document 1, when a multi-feed occurs, the image forming operation is stopped, so when a multi-feed occurs while printing multiple sheets, the user needs to check the printed sheets to confirm the sheets on which the multi-feed occurred. Therefore, an object of one aspect of the present disclosure is to provide an image forming device that can easily confirm the print page that should have been printed on the sheet on which the multi-feed occurred. [Means for solving the problem]

[0005] An image forming apparatus according to one embodiment of the present disclosure includes a transport unit that transports multiple sheets of paper in sequence, a printing unit that prints multiple print pages on each of the multiple sheets of paper, a multi-feed detection unit that detects that a multi-feed has occurred in a sheet of paper included in the multiple sheets of paper, and a notification unit that notifies error information that can identify the print page that should have been printed on the sheet of paper on which the multi-feed has occurred. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a block diagram showing an example of a configuration of an image forming apparatus. [Diagram 2] 5 is a flowchart showing an example of an operation of the image forming apparatus according to the first embodiment. [Figure 3A] FIG. 13 is a diagram showing an example of a single sheet of printed paper when no multifeed has occurred; [Figure 3B] FIG. 13 is a diagram showing an example of two printed sheets of paper when double feeding occurs; [Figure 4] 6 is a flowchart showing an example of a multi-feed handling process in the image forming apparatus according to the first embodiment. [Diagram 5] 10A and 10B are diagrams illustrating an example of a print result and a paper ejection method. [Figure 6] 3 is a flowchart showing an example of the operation of the image forming apparatus subsequent to FIG. 2. [Figure 7] FIG. 13 is a diagram showing an example of a screen showing a page number indicated by error information. [Figure 8] 10 is a flowchart showing an example of an operation of an image forming apparatus according to a second embodiment. [Figure 9] 10 is a flowchart showing an example of a multi-feed handling process in an image forming apparatus according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] First embodiment A first embodiment will be described with reference to Figures 1 to 7. In the drawings, the same or similar elements are given the same reference numerals, and duplicated explanations will be omitted.

[0008] 1 is a block diagram showing an example of the configuration of an image forming apparatus 100. Furthermore, the image forming apparatus 100 is provided with a plurality of paper discharge ports for discharging a plurality of printed sheets of paper.

[0009] The communication unit 101 is an interface for connecting to a network.

[0010] The display unit 102 displays information to be presented to a user. For example, the display unit 102 is configured with a liquid crystal panel, an organic EL (Electro-Luminescence) panel, or the like.

[0011] The reception unit 103 receives an operation by a user. For example, the reception unit 103 is configured with a touch panel.

[0012] Image input unit 104 acquires manuscript data and paper size information. For example, image input unit 104 acquires manuscript data and paper size information by communication unit 101 receiving manuscript data and paper size information transmitted from a terminal device (not shown) connected to image forming apparatus 100 via a network. For example, the terminal device is a PC (Personal Computer), a smartphone, a tablet terminal, etc. The manuscript data includes at least a plurality of print pages. The paper size information indicates the paper size for the plurality of print pages indicated by the manuscript data. Then, image input unit 104 stores the input manuscript data and paper size information in storage unit 105.

[0013] The storage unit 105 is a recording medium capable of recording various data, programs, etc. For example, the storage unit 105 is configured with an HDD (Hard Disk Drive), an SSD (Solid State Drive), a semiconductor memory, etc. The storage unit 105 stores manuscript data, paper size information, etc.

[0014] The storage section 106 stores the sheets of paper and feeds the sheets of paper in sequence.

[0015] The transport unit 107 transports a plurality of sheets of paper in sequence. Specifically, the transport unit 107 transports a plurality of sheets of paper in sequence toward the printing unit 108, and transports printed sheets of paper to one of a plurality of paper discharge ports. The transport unit 107 is composed of rollers for transporting the sheets of paper, etc.

[0016] Furthermore, the conveying unit 107 conveys the paper in which no double feed has occurred so as to be discharged by the first paper discharge method, and conveys the paper in which a double feed has occurred so as to be discharged by the second paper discharge method.

[0017] The printing unit 108 prints the multiple print pages included in the manuscript data onto the multiple sheets of paper transported by the transport unit 107. Specifically, the printing unit 108 prints the multiple print pages onto the multiple sheets of paper, respectively, to generate multiple printed sheets of paper. The printing unit 108 prints onto the paper by an electrophotographic method, an inkjet method, a thermal transfer method, or the like. Furthermore, after printing onto the sheet of paper on which the multiple feed occurred, the printing unit 108 reprints onto a new sheet of paper the print pages that should have been printed on the sheet of paper on which the multiple feed occurred.

[0018] The control unit 109 executes various processes according to the programs and data stored in the storage unit 105. For example, the control unit 109 is configured with a processor such as a CPU (Central Processing Unit). The control unit 109 includes a size detection unit 111, a double feed detection unit 112, a conveyance control unit 113, and an alarm unit 114.

[0019] The dimension detection unit 111 detects the dimension of the paper being transported by the transport unit 107 .

[0020] Multi-feed detection unit 112 detects that multi-feed has occurred in a sheet of paper included in the plurality of sheets of paper transported by transport unit 107. For example, when the dimensions detected by dimension detection unit 111 are larger than the designated paper size indicated by the paper size information, multi-feed detection unit 112 detects that multi-feed has occurred in the sheets of paper being transported by transport unit 107. Note that multi-feed refers to a state in which two or more sheets of paper are transported overlapping each other, when the sheets should be transported separately one by one.

[0021] The transport control unit 113 controls the transport unit 107 to transport the paper.

[0022] The notification unit 114 notifies error information that can identify the print page that should have been printed on the paper where the multi-feed occurred. For example, the error information indicates the page number of the print page that should have been printed on the paper where the multi-feed occurred.

[0023] FIG. 2 is a flowchart showing an example of the operation of the image forming apparatus 100 according to the present embodiment.

[0024] In step S201, image input unit 104 acquires manuscript data and paper size information. For example, communication unit 101 acquires manuscript data and paper size information by receiving manuscript data and paper size information transmitted from a terminal device connected to image forming apparatus 100 via a network. Then, image input unit 104 stores the acquired manuscript data and paper size information in storage unit 105.

[0025] In step S202, the printing unit 108 reads the first page of the manuscript data stored in the storage unit 105 as a print page.

[0026] In step S203, the conveyance control unit 113 pulls out the paper stored in the storage unit 106 and feeds one sheet of paper to the storage unit 106. Note that the process of reading the manuscript data in step S202 and the process of feeding the paper in step S203 may be executed in parallel.

[0027] In step S204, the conveyance control unit 113 causes the conveyance unit 107 to convey the paper fed in step S203.

[0028] In step S205, the printing unit 108 prints the print page read in step S202 onto the paper conveyed in step S204. Through the processes in steps S201 to S205, the printing unit 205 prints the multiple print pages onto multiple papers, respectively, to generate multiple printed papers.

[0029] In step S206, dimension detection unit 111 detects the dimension of the paper being transported by transport unit 107. The dimension detected by dimension detection unit 111 is the dimension of the paper printed by printing unit .

[0030] In step S207, the double feed detection unit 112 determines whether the detected dimensions are larger than the paper size indicated by the paper size information stored in the storage unit 105. However, if the detected dimensions are within the range of variation in paper size, the result is not included in this determination.

[0031] In step S207, if the detected dimension is equal to or smaller than the paper size indicated by the paper size information, the control unit 109 proceeds to step S401 illustrated in Fig. 4. On the other hand, in step S207, if the detected dimension is larger than the paper size indicated by the paper size information, the multi-feed detection unit 112 determines in step S208 that a multi-feed has occurred. That is, in the image forming apparatus 100 according to the present embodiment, by executing the processes of steps S205 to S208, the multi-feed determination unit 112 detects whether a multi-feed has occurred for the paper on which the print page has been printed by the printing unit 108, thereby detecting whether a multi-feed has occurred after the printing unit 108 has printed.

[0032] The print result will be described with reference to Figures 3A and 3B. Figure 3A is a diagram showing an example of a printed sheet 301 when no double feeding has occurred. An image 300 is printed on the sheet 301. Since the image 300 fits within the sheet 301, the print result of the sheet 301 is successful.

[0033] On the other hand, Fig. 3B is a diagram showing an example of printed paper 302 and paper 303 when a multi-feed occurs. As shown in Fig. 3B, when a multi-feed occurs, image 300 is printed across paper 302 and paper 303. In other words, since a portion of image 300 is not printed on paper 302, the print result of paper 302 is a failure.

[0034] In the next step S209, the control unit 109 executes a multiple feeding handling process indicated by the processes of steps S401 to S409 illustrated in FIG.

[0035] The multi-feed handling process in the image forming apparatus 100 according to the present embodiment will be described with reference to Fig. 4. Fig. 4 is a flow chart showing an example of the multi-feed handling process in the image forming apparatus 100 according to the present embodiment.

[0036] In step S401, the multifeed detection unit 112 stores in the storage unit 105 the page number of the print page printed on the sheet on which it is determined that a multifeed has occurred in step S208 illustrated in FIG.

[0037] In step S402, the conveyance control unit 113 sets a second paper ejection method different from the first paper ejection method for the print page to be printed on the paper where the double feed occurred. For example, the first paper ejection method is to eject the paper to a normal paper ejection position, and the second paper ejection method is to eject the paper to a paper ejection position different from the normal paper ejection position. For example, the second paper ejection method is to eject the paper to a position moved from the normal paper ejection position along the paper ejection direction.

[0038] Alternatively, the first paper ejection method may be to eject the paper to one of a plurality of paper ejection outlets, and the second paper ejection method may be to eject the paper to a paper ejection outlet other than the one of the plurality of paper ejection outlets.

[0039] In step S403, conveyance control unit 113 conveys the paper on which the multi-feed has occurred to conveyance unit 107 so as to be discharged by the second paper discharge method. In other words, conveyance control unit 113 discharges the paper on which the multi-feed has occurred to conveyance unit 107 so that the user can easily check the paper on which the multi-feed has occurred from among multiple printed papers and can easily remove the paper on which the multi-feed has occurred. This allows image forming apparatus 100 to reduce the work time required for the user to check the paper on which the multi-feed has occurred.

[0040] In step S404, the conveyance control unit 113 sets the first paper ejection method. For example, the conveyance control unit 113 sets the conveyance unit 107 to eject the paper to the standard paper ejection position. In other words, the conveyance control unit 113 sets the conveyance unit 107 to eject the paper to the paper ejection port that ejects the paper that is not being fed multiple times.

[0041] In step S405, the conveyance control unit 113 pulls out the paper stored in the storage unit 106, and causes the storage unit 106 to feed one sheet of paper.

[0042] In step S406, the conveyance control unit 113 causes the conveyance unit 107 to convey the paper fed in step S405 toward the printing unit .

[0043] In step S407, printing unit 108 prints the print page that should have been printed on the paper on which the multi-feed occurred, onto the paper transported in step S406. Specifically, after printing on the paper on which the multi-feed occurred, printing unit 108 reprints, onto a new sheet of paper, the print page that should have been printed on the paper on which the multi-feed occurred. Then, transport control unit 113 causes transport unit 107 to transport the new reprinted paper so that it is discharged using the second paper discharge method. In other words, transport unit 107 transports the new reprinted paper so that it is discharged using the second paper discharge method.

[0044] An example of the process of steps S402 to S407 will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of a print result and a paper ejection method.

[0045] When it is determined that the occurrence of the multi-feed has been detected in step S208 illustrated in FIG. 2, the image 500 is printed across both the paper 501 and the paper 502. Then, the conveyance control unit 113 executes the processes of steps S402 to S403 illustrated in FIG. 4, thereby causing the conveyance unit 107 to convey the paper 501 and the paper 502 so as to be discharged in a different paper discharge method from that of the paper 503 in which the multi-feed has not occurred. Then, the conveyance control unit 113 executes the processes of steps S404 to S407, thereby reprinting the image 500 indicated by the print page on the paper 503. In this way, the image forming apparatus 100 allows the user to easily distinguish between the paper 501 and the paper 502 in which the multi-feed has occurred and the reprinted paper 503.

[0046] In the next step S408, the dimension detection unit 111 detects the dimensions of the printed paper. That is, the dimension detection unit 111 detects the dimensions of the paper reprinted in step S407.

[0047] In step S409, the multi-feed detection unit 112 determines whether the detected dimension is larger than the paper size indicated by the paper size information stored in the storage unit 105. If the detected dimension in step S409 is equal to or smaller than the paper size indicated by the paper size information, the control unit 109 ends the multi-feed handling process and proceeds to step S601 illustrated in FIG. 6. On the other hand, if the detected dimension in step S409 is larger than the paper size indicated by the paper size information, the control unit 109 returns the process to step S402. That is, if a multi-feed occurs again after the printing unit 108 reprints, on a new sheet of paper, the print page that should have been printed on the sheet on which the multi-feed occurred, the control unit 109 repeats the processes of steps S402 to S409 until the occurrence of the multi-feed is no longer detected.

[0048] The operation of the image forming apparatus 100 will be further described with reference to Fig. 6. Fig. 6 is a flow chart showing an example of the operation of the image forming apparatus 100 following Fig. 2.

[0049] 2 or step S409 shown in FIG 4, if the detected dimensions are equal to or smaller than the paper size indicated by the paper size information, then in step S401, conveyance control unit 113 causes conveyance unit 107 to convey the paper in which no double feed has occurred so as to be discharged by the first paper discharge method. In other words, conveyance unit 107 conveys the paper in which no double feed has occurred so as to be discharged by the first paper discharge method.

[0050] In step S602, the printing unit 108 determines whether or not all print pages of the manuscript data stored in the storage unit 105 have been printed. If all print pages have not been printed in step S602, the printing unit 108 reads the next print page from the manuscript data in step S603. That is, the printing unit 108 reads an unprinted print page included in the manuscript data stored in the storage unit 105. Then, the control unit 109 returns the process to step S205 illustrated in FIG. 2.

[0051] On the other hand, if all print pages have been printed in step S602, then in step S604, the notification unit 114 determines whether or not the occurrence of a multi-feed has been detected. Specifically, the notification unit 114 determines whether or not the page number of the print page printed on the paper on which the multi-feed has occurred is stored in the storage unit 105. If the page number of the print page printed on the paper on which the multi-feed has occurred is stored in the storage unit 105, the notification unit 114 determines that the occurrence of a multi-feed has been detected. On the other hand, if the page number of the print page printed on the paper on which the multi-feed has occurred is not stored in the storage unit 105, the notification unit 114 determines that the occurrence of a multi-feed has not been detected.

[0052] If it is determined in step S604 that a multi-feed has not occurred, control unit 109 ends the process of printing the print page included in the document data. On the other hand, if it is determined in step S604 that a multi-feed has occurred, notification unit 114 notifies, in step S605, error information indicating the page number of the print page printed on the paper on which the multi-feed occurred. For example, notification unit 114 causes display unit 102 to display screen 701 (see FIG. 7) indicating the page number indicated by the error information. This allows image forming apparatus 100 to allow the user to easily check the print page that should have been printed on the paper on which the multi-feed occurred.

[0053] Alternatively, when communication unit 101 receives the manuscript data and paper size information from the terminal device in step S201, notification unit 114 may notify the terminal device that is the sender of the manuscript data of the error information. When the terminal device receives the error information, the terminal device displays screen 701 indicating the page number indicated by the error information on a display unit (not shown) of the terminal device. This allows the user to recognize the page number of the print page printed on the paper where the multiple feed occurred by operating a terminal device that is located at a different location from image forming device 100, without moving to the location where image forming device 100 is installed.

[0054] If notification unit 114 did not notify error information indicating the page number of the print page printed on the paper where the multifeed occurred, the user would need to check each printed and ejected paper sheet one by one to check whether the print result meets the user's expectations. However, image forming apparatus 100 notifies error information indicating the page number of the print page printed on the paper where the multifeed occurred, so that the user does not need to check each printed and ejected paper sheet one by one. This allows image forming apparatus 100 to reduce the time spent by the user on the checking task.

[0055] 7 is a diagram showing an example of a screen 701. For example, the screen 701 indicates that a multiple feed has occurred for print pages 5 and 15. This allows the user to recognize from the screen 701 that printing of the print pages 5 and 15 of the manuscript data has failed.

[0056] (Variation 1) When image forming apparatus 100 performs double-sided printing, if a multi-feed occurs, a paper jam may occur when transport unit 107 transports the paper, which may cause a malfunction of image forming apparatus 100. Therefore, as a first modified example of image forming apparatus 100 according to the present embodiment, printing unit 108 may stop printing if a multi-feed occurs during double-sided printing. This makes it possible for image forming apparatus 100 according to this modified example to prevent malfunctions caused by the occurrence of a multi-feed.

[0057] Furthermore, in image forming apparatus 100 according to this modification, when control unit 109 cancels printing, notification unit 114 notifies the user of error information indicating that printing is to be canceled. For example, notification unit 114 causes display unit 102 to display a message indicating that printing is to be canceled. Alternatively, notification unit 114 may notify the terminal device that is the sender of the manuscript data of a message indicating that printing is to be canceled. In this way, image forming apparatus 100 according to this modification can make the user aware that printing is to be canceled.

[0058] (Variation 2) As a second modification of the image forming apparatus 100 according to the present embodiment, the printing unit 108 may print a plurality of print pages included in the document data, and then reprint a print page that should have been printed on the paper on which the multi-feed occurred, onto a new sheet of paper. In other words, when the multi-feed occurs, the printing unit 108 may reprint a print page that should have been printed on the paper on which the multi-feed occurred, after printing all print pages of the document data, without executing the processes of steps S407 to S409 illustrated in FIG. 4. This allows the image forming apparatus 100 according to this modification to gather the reprinted sheets at the end of the plurality of ejected sheets of paper, thereby allowing the user to more easily identify the reprinted print pages from the plurality of ejected sheets of paper.

[0059] (Variation 3) As a third modified example of the image forming apparatus 100 according to the present embodiment, the image forming apparatus 100 may discharge a sheet on which the page printed on the sheet on which the multifeed occurred and subsequent pages are to be printed, using the second paper discharge method. In other words, the conveying unit 107 may convey a sheet on which the page that should have been printed on the sheet on which the multifeed occurred and subsequent pages are to be printed, and which has not been subjected to the multifeed, so as to discharge the sheet using the second paper discharge method instead of the first paper discharge method. In this way, the image forming apparatus 100 according to this modified example allows the user to easily recognize the page that should have been printed on the sheet on which the multifeed occurred and subsequent pages are to be printed.

[0060] (Variation 4) As a fourth modification of the image forming apparatus 100 according to the present embodiment, the image forming apparatus 100 may discharge a sheet on which the page printed on the sheet on which the multifeed occurred and subsequent pages are printed by a different paper discharge method from that used for the previous page. In other words, when a new multifeed occurs after the occurrence of the multifeed, the conveying unit 107 conveys the sheet on which the page that should have been printed on the new sheet on which the multifeed occurred and subsequent pages are printed and on which the multifeed has not occurred, by discharging the sheet by the first paper discharge method instead of the second paper discharge method. In this way, the image forming apparatus 100 according to this modification outputs the sheet on which the multifeed occurred by a different paper discharge method from that used for the sheet on which the page immediately before the print page printed on the sheet was printed. As a result, the image forming apparatus 100 according to this modification allows the user to easily recognize the print page that should have been printed on the sheet on which the multifeed occurred.

[0061] Second Embodiment The second embodiment will be described with reference to Figures 8 and 9. In the drawings, the same or similar elements are given the same reference numerals, and duplicated explanations are omitted. Configurations and processes having substantially the same functions as the other embodiments are referred to by the same reference numerals, and explanations are omitted, and differences from the other embodiments are described.

[0062] The difference between image forming apparatus 100 according to this embodiment and image forming apparatus 100 according to the first embodiment is that multi-feed detection unit 112 detects that multi-feeding has occurred for unprinted paper.

[0063] 8 is a flowchart showing an example of the operation of the image forming apparatus 100 according to the present embodiment. The processes in steps S801 to S804 are similar to the processes in steps S201 to S204 shown in FIG.

[0064] In step S805, the dimension detection unit 111 detects the dimension of the paper being transported by the transport unit 107. The dimension detected by the dimension detection unit 111 is the dimension of the paper on which no printing has been performed by the printing unit .

[0065] In step S806, the multi-feed detection unit 112 determines whether the detected dimension is larger than the paper size indicated by the paper size information stored in the storage unit 105. In step S806, if the detected dimension is equal to or smaller than the paper size indicated by the paper size information, the control unit 109 proceeds to step S809. On the other hand, in step S806, if the detected dimension is larger than the paper size indicated by the paper size information, the multi-feed detection unit 112 determines in step S807 that a multi-feed has occurred. That is, in the image forming apparatus 100 according to this embodiment, the multi-feed detection unit 112 detects whether a multi-feed has occurred before the printing unit 108 prints by detecting whether a multi-feed has occurred for a sheet on which a print page has not been printed by the printing unit 108. Then, in step S808, the control unit 109 executes a multi-feed handling process indicated by the processes of steps S901 to S908 illustrated in FIG. 9.

[0066] In step S809, the printing unit 108 prints the print page read in the process of step S802 on the paper transported in step S804. That is, when the image forming apparatus 100 according to the present embodiment determines that a multi-feed has occurred, it executes a multi-feed handling process by the processes of steps S901 to S907 illustrated in Fig. 9, and then prints the print page read in the process of step S802 on the paper.

[0067] A multi-feed handling process in the image forming apparatus 100 according to this embodiment will be described with reference to Fig. 9. Fig. 9 is a flow chart showing an example of the multi-feed handling process in the image forming apparatus 100 according to this embodiment. The processes in steps S901 to S906 are similar to the processes in steps S301 to S306 exemplified in Fig. 3, and therefore detailed description will be omitted.

[0068] In step S906, the conveyance control unit 113 causes the conveyance unit 107 to convey the paper fed in step S905 toward the printing unit 108, and then in step S907, the dimension detection unit 111 detects the dimensions of the paper being conveyed.

[0069] In step S908, multi-feed detection unit 112 determines whether the detected dimension is larger than the paper size indicated by the paper size information stored in storage unit 105. If the detected dimension in step S908 is equal to or smaller than the paper size indicated by the paper size information, control unit 109 ends the multi-feed handling process and proceeds to step S809 illustrated in Fig. 8. On the other hand, if the detected dimension is larger than the paper size indicated by the paper size information in step S207, control unit 109 returns the process to step S902. That is, control unit 109 repeats the processes of steps S902 to S908 until occurrence of multi-feeding is no longer detected.

[0070] As described above, the image forming apparatus 100 according to the present embodiment can print the print pages included in the document data onto paper without causing a reliably double feed.

[0071] In the above embodiment, a method for detecting occurrence of a multi-feed has been described by exemplifying a method in which the multi-feed detection unit 112 detects occurrence of a multi-feed based on the dimensions detected by the dimension detection unit 111. However, in the image forming apparatus 100, the method for detecting occurrence of a multi-feed is not limited to a method for detecting occurrence of a multi-feed based on the dimensions detected by the dimension detection unit 111, and the details are not important as long as occurrence of a multi-feed can be detected.

[0072] For example, image forming apparatus 100 may include an ultrasonic sensor that detects the thickness of the paper being transported by transport unit 107. In this case, multi-feed detection unit 112 detects that a multi-feed has occurred in the paper being transported by transport unit 107 when the thickness detected by the ultrasonic sensor exceeds a predetermined thickness. Alternatively, image forming apparatus 100 may include a camera that captures the paper being transported. In this case, multi-feed detection unit 112 may detect that a multi-feed has occurred in the paper being transported by transport unit 107 when an image acquired by the camera includes an image of two or more overlapping sheets of paper being transported.

[0073] The processes executed in the above-described embodiments are not limited to the process modes exemplified in the above-described embodiments. The above-described functional blocks may be realized using either a logic circuit (hardware) formed in an integrated circuit or the like, or software using a CPU. The processes executed in the above-described embodiments may be executed by multiple computers. For example, the processes executed in each functional block of the image forming apparatus 100 may be partially executed by another computer, or all of the processes may be shared and executed by multiple computers.

[0074] The present disclosure is not limited to the above-mentioned embodiment, and may be replaced with a configuration substantially the same as the configuration shown in the above-mentioned embodiment, a configuration having the same action and effect, or a configuration capable of achieving the same purpose. The present disclosure also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, by combining the technical means disclosed in each embodiment, a new technical feature can be formed. [Explanation of symbols]

[0075] 100 image forming apparatus, 101 communication unit, 102 display unit, 103 reception unit, 104 image input unit, 105 storage unit, 106 storage unit, 107 transport unit, 108 printing unit, 109 control unit, 111 size detection unit, 112 double feed detection unit, 113 transport control unit, 114 notification unit, 300 image, 301 paper, 302 paper, 303 paper, 500 image, 501 paper, 502 paper, 503 paper, 701 screen

Claims

1. A conveying unit that conveys a plurality of sheets of paper in sequence; a printing unit that prints a plurality of print pages on each of the plurality of sheets of paper; a multi-feed detection unit that detects occurrence of multi-feeding in a sheet included in the plurality of sheets; a notification unit that notifies error information that can identify a print page that should have been printed on the sheet where the multiple feed occurred; Equipped Image forming device.

2. The conveying unit conveys the paper in which the double feed has not occurred so as to be discharged by a first paper discharge method, and conveys the paper in which the double feed has occurred so as to be discharged by a second paper discharge method. The image forming apparatus according to claim 1 .

3. After printing on the paper on which the multi-feed occurred, the printing unit reprints, on a new sheet of paper, the print page that should have been printed on the paper on which the multi-feed occurred. The image forming apparatus according to claim 1 .

4. The conveying unit conveys the paper in which the double feed has not occurred so as to be discharged by a first paper discharge method, and conveys the new paper so as to be discharged by a second paper discharge method. The image forming apparatus according to claim 3 .

5. the first paper ejection method is to eject the paper to a normal paper ejection position; The second paper ejection method is to eject the paper to a paper ejection position different from the normal paper ejection position.

5. The image forming apparatus according to claim 2 or 4.

6. the printing unit prints the plurality of print pages onto the plurality of sheets of paper, respectively, to generate a plurality of printed sheets of paper; a plurality of paper discharge ports for discharging the plurality of printed sheets of paper; Further equipped with the first paper discharge method is discharging the paper to one of the plurality of paper discharge ports, The second paper discharge method is to discharge the paper to a paper discharge outlet other than the one paper discharge outlet among the plurality of paper discharge outlets.

5. The image forming apparatus according to claim 2 or 4.

7. After printing on the paper on which the multi-feed occurred, the printing unit reprints, on the new paper, the print page that should have been printed on the paper on which the multi-feed occurred. The image forming apparatus according to claim 3 .

8. After printing the plurality of print pages, the printing unit reprints, onto the new paper, the print page that should have been printed on the paper on which the multifeed occurred. The image forming apparatus according to claim 3 .

9. The multi-feed detection unit detects whether or not the multi-feed has occurred for a sheet on which a print page has been printed by the printing unit. The image forming apparatus according to claim 1 .

10. The multi-feed detection unit detects whether or not the multi-feed has occurred for a sheet of paper on which a print page has not been printed by the printing unit. The image forming apparatus according to claim 1 .

11. The conveying unit conveys a sheet on which a page subsequent to the page that should have been printed on the sheet on which the multifeed occurred is to be printed and which is not subject to the multifeed, so as to discharge the sheet by the second sheet discharge method instead of the first sheet discharge method.

5. The image forming apparatus according to claim 2 or 4.

12. When a new multifeed occurs after the occurrence of the multifeed, the conveying unit conveys a sheet on which the print page that should have been printed on the sheet on which the new multifeed occurred and subsequent pages are printed, so as to be discharged in a paper discharge method different from that of the print page immediately preceding the print page that should have been printed on the sheet on which the new multifeed occurred. The image forming apparatus according to claim 11.

13. The printing unit stops printing if the multiple feeding occurs during double-sided printing. The image forming apparatus according to claim 1 .

Images