Image forming apparatus, control method thereof, and program

Abstract

The present invention provides a novel mechanism that enables efficient early detection of abnormalities in images, for example, when detecting abnormalities in an image forming apparatus. [Solution] The image forming apparatus includes a diagnostic means for diagnosing a first abnormality in an image formed on a sheet based on a first criterion and a second abnormality based on a second criterion that is stricter than the first criterion, and a setting means for setting whether or not to perform a diagnosis of the second abnormality. If the second criterion is a criterion that the diagnostic means cannot detect the second abnormality, the setting means is set not to diagnose the second abnormality.

Description

Technical Field

[0001] The present invention relates to an image forming apparatus, a control method thereof, and a program.

Background Art

[0002] There is known an image forming apparatus that detects an abnormality from an image formed and identifies a part of the cause from the detected abnormality. In an image forming apparatus having a reading unit, it is possible to read an image formed on a sheet output from the apparatus itself, detect an abnormality included in the image, and identify a part of the cause. Further, according to such an image forming apparatus, in order to perform maintenance work before a failure of the image forming apparatus actually occurs, it is also possible to diagnose a precursor of an unacceptable abnormality by setting a strict detection level of an abnormality. Patent Document 1 proposes an image forming apparatus that repairs an abnormality when an abnormality is detected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, when the detection level of an abnormality is set to be equivalent to the abnormality detection ability of the image forming apparatus, the detection level of a precursor of an abnormality is set more strictly than the detection level of an abnormality, so a precursor of an abnormality cannot be detected. Further, for example, even when the detection level of a precursor of an abnormality is set to a level exceeding the abnormality detection ability of the image forming apparatus, a precursor of an abnormality cannot be detected. However, even in such cases, the process for precursor diagnosis of an abnormality is executed. Therefore, the execution of the process for precursor diagnosis of an abnormality becomes wasteful.

[0005] The present invention has been made in view of at least one of the above-mentioned problems, and provides a novel mechanism that enables efficient early detection of abnormalities when detecting abnormalities in an image forming apparatus. [Means for solving the problem]

[0006] According to one aspect of the present invention, An image forming apparatus, A diagnostic means for diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The system includes a setting means for setting whether or not to perform the diagnosis of the second abnormality, The image forming apparatus is characterized in that, if the second criterion is a criterion that makes it impossible to detect the second abnormality by the diagnostic means, the setting means is set not to diagnose the second abnormality. [Effects of the Invention]

[0007] According to the present invention, when detecting an anomaly in an image forming apparatus, it is possible to efficiently perform a preliminary diagnosis of an anomaly. [Brief explanation of the drawing]

[0008] [Figure 1] Overview diagram of a printing system according to one embodiment. [Figure 2] Cross-sectional view of an image forming apparatus according to one embodiment. [Figure 3] Functional block diagram of a printing system according to one embodiment. [Figure 4] Display screen of an image forming apparatus according to one embodiment [Figure 5] Display screen of an image forming apparatus according to one embodiment [Figure 6] Flowchart of the process according to one embodiment [Figure 7] 1. Diagram illustrating the detection size of the following procedure. [Figure 8] Display screen of an image forming apparatus according to one embodiment [Figure 9]Display screen of an image forming apparatus according to an embodiment [Figure 10] Display screen of an image forming apparatus according to an embodiment [Figure 11] Display screen of an image forming apparatus according to an embodiment [Figure 12] Explanatory diagram of repair contents according to an embodiment [Figure 13] Flowchart of processing according to an embodiment [Figure 14] Explanatory diagram of detection size according to an embodiment [Figure 15] Display screen of an image forming apparatus according to an embodiment [Figure 16] Display screen of an image forming apparatus according to an embodiment [Figure 17] Display screen of an image forming apparatus according to an embodiment [Figure 18] Display screen of an image forming apparatus according to an embodiment

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiments, all of these plurality of features are not necessarily essential to the invention, and the plurality of features may be arbitrarily combined. Further, in the accompanying drawings, the same or similar configurations are denoted by the same reference numerals, and redundant descriptions are omitted.

[0010] In this specification, the term "image forming apparatus" broadly includes apparatuses that form (record) images on a recording material (also referred to as a recording medium, sheet, or paper), such as a single-function printer, copier, multifunction device, commercial printer, etc. Note that the following image forming apparatuses have a maximum sheet size that is A3 long-edge length in the conveyance direction and A3 short-edge length in the direction perpendicular to the conveyance direction (hereinafter also referred to as an A3 machine). Further, hereinafter, when the longitudinal direction of the sheet is arranged parallel to the sheet conveyance direction when the image is formed on the sheet, it is said that the sheet conveyance direction is horizontal, and when the short-side of the sheet is arranged parallel to the sheet conveyance direction, it is said that the sheet conveyance direction is vertical. Note that as the sheet, various sheet materials of different sizes and materials can be used, such as paper like plain paper or thick paper, sheet materials with surface treatment like coated paper, plastic films, cloth, and special-shaped sheet materials such as envelopes and index paper.

[0011] (First Embodiment) <Configuration of the Entire System> FIG. 1 is a diagram showing an example of a network configuration including a printing system 100 (image processing system) according to the present embodiment. As shown in FIG. 1, the printing system 100 includes an image forming apparatus 101 and an external controller 102. The image forming apparatus 101 and the external controller 102 are communicably connected via an internal LAN 105 and a video cable 106. Further, the external controller 102 is communicably connected to a client PC 103 via an external LAN 104.

[0012] The client PC 103 can issue print commands to the external controller 102 via the external LAN 104. The client PC 103 has a printer driver installed that has the function of converting image data to be printed into a Page Description Language (PDL) that can be processed by the external controller 102. Users who want to print can issue print commands via the printer driver from various applications installed on the client PC 103 by operating the client PC 103. Based on the print command from the user, the printer driver sends the PDL data, which is the print data, to the external controller 102. When the external controller 102 receives the PDL data from the client PC 103, it analyzes and interprets the received PDL data. Based on the result of the interpretation, it performs rasterization processing to generate a bitmap image (print image data) with a resolution matched to the image forming apparatus 101, and issues a print command by submitting a print job to the image forming apparatus 101.

[0013] Next, the image forming apparatus 101 will be described. The image forming apparatus 101 is configured to enable complex printing processes such as bookbinding by connecting multiple devices with different functions. Specifically, the image forming apparatus 101 has a printing unit 107 (image forming unit), a diagnostic unit 108, a stacker 109, and a finisher 110. Each module will be described below. Note that the diagnostic unit 108 is an example of the "diagnostic means" of the present invention.

[0014] The printing unit 107 prints images according to the print job and discharges the printed recording material (sheets). The printed recording material discharged from the printing unit 107 is transported through the diagnostic unit 108, the stacker 109, and the finisher 110 in that order. In this embodiment, the image forming apparatus 101 of the printing system 100 is an example of an image forming apparatus, but the printing unit 107 included in the image forming apparatus 101 may also be referred to as the image forming apparatus. The printing unit 107 forms (prints) images using toner (colorant) on the recording material fed and transported from the paper feed unit located at the bottom of the printing unit 107.

[0015] The diagnostic unit 108 is an image diagnostic device that diagnoses the presence or absence of abnormalities in the image forming apparatus 101 based on printed recording material that has been printed by the printing unit 107 and transported through the transport path. Specifically, the diagnostic unit 108 reads the image printed on the transported printed recording material and performs a diagnosis from the obtained read image. The diagnosis of abnormalities is determined by extracting a diagnostic area from the read image and confirming the difference in read signal values ​​within the extracted diagnostic area. The detailed processing of the diagnostic unit will be described later. The diagnostic unit is also used during quality control. It is also a device that inspects the printed recording material for defects or abnormalities in image quality based on a comparison between the data on the printed recording material, which has been printed by the printing unit 107 and transported through the transport path, and the printed data.

[0016] The stacker 109 is a device capable of stacking a large number of printed recording materials. The finisher 110 is a device capable of performing finishing processes such as stapling, punching, and saddle stitching on the transported printed recording materials. After processing by the finisher 110, the recording materials are discharged into a designated output tray.

[0017] In the configuration example shown in Figure 1, an external controller 102 is connected to the image forming apparatus 101, but this embodiment can also be applied to other configurations. For example, the image forming apparatus 101 may be connected to an external LAN 104, and print data may be transmitted from the client PC 103 to the image forming apparatus 101 without going through the external controller 102. In this case, data analysis and rasterization of the print data may be performed by the image forming apparatus 101.

[0018] <Hardware configuration of the image forming apparatus 101> A specific example of the operation of the image forming apparatus 101 will be explained with reference to Figure 2.

[0019] <Explanation of the paper feed deck> The printing unit 107 is equipped with, for example, six types of paper feed decks 361, 362, 363, 364, 365, and 366. Various types of recording material are stored in each paper feed deck. Of the recording material stored in each paper feed deck, the topmost recording material is separated one sheet at a time and fed to the transport path 303. In addition, each of the image forming stations 304 to 307 contains a photosensitive drum (photoreceptor) and uses different colored toners to form a toner image on the photosensitive drum. Specifically, each of the image forming stations 304 to 307 uses yellow (Y), magenta (M), cyan (C), and black (K) toners to form a toner image.

[0020] The toner images of each color formed in the image forming stations 304 to 307 are sequentially transferred onto the intermediate transfer belt 308 (primary transfer). The toner images transferred to the intermediate transfer belt 308 are transported to the secondary transfer position 309 as the intermediate transfer belt 308 rotates. At the secondary transfer position 309, the toner images are transferred from the intermediate transfer belt 308 to the recording material that has been transported along the transport path 303 (secondary transfer). After the secondary transfer, the recording material is transported to the fixing unit 311. The fixing unit 311 is equipped with a pressure roller and a heating roller. Heat and pressure are applied to the recording material as it passes between these rollers, fixing the toner image onto the recording material. The recording material that has passed through the fixing unit 311 is transported through the transport path 312 to the connection point 315 between the printing unit 107 and the diagnostic unit 108. In this way, a color image is formed (printed) on the recording material.

[0021] If further fixing is required depending on the type of recording material, the recording material that has passed through the fixing unit 311 is guided to the transport path 314 where the fixing unit 313 is located. The fixing unit 313 performs further fixing on the recording material being transported in the transport path 314. The recording material that has passed through the fixing unit 313 is transported to the connection point 315. If the operation mode for double-sided printing is set, the image is printed on the first side, and the recording material that has been transported in the transport path 312 or transport path 314 is guided to the inversion path 316. The recording material that has been inverted in the inversion path 316 is guided to the double-sided transport path 317 and transported to the secondary transfer position 309. As a result, the toner image is transferred to the second side of the recording material, which is opposite to the first side, at the secondary transfer position 309. After that, the recording material passes through the fixing unit 311 (and fixing unit 313), completing the formation of the color image on the second side of the recording material.

[0022] Once the image formation (printing) in the printing unit 107 is complete, the printed recording material, which has been transported to the connection point 315, is transported into the diagnostic unit 108. The diagnostic unit 108 is equipped with image reading units (331, 332) having CIS (Contact Image Sensors) on the transport path 330 through which the printed recording material from the printing unit 107 is transported. The image reading units (331, 332) are positioned opposite each other across the transport path 330. The image reading units (331, 332) are configured to read the upper surface (first surface) and lower surface (second surface) of the recording material, respectively. Note that the image reading units may be composed of, for example, a CCD (Charge Coupled Device) or a line scan camera instead of a CIS.

[0023] The diagnostic unit 108 performs various image diagnostic processes on the image forming apparatus 101 based on the image printed on the printed recording material being transported along the transport path 330. Specifically, when the printed recording material being transported reaches a predetermined position, the diagnostic unit 108 uses the image reading units (331, 332) to read the image of the printed recording material. Then, using the read image, it performs inspection diagnosis to check for abnormalities in the output being printed (an example of the "first abnormality" in this invention), and precursor diagnosis to diagnose precursors to abnormalities (an example of the "second abnormality" in this invention). In this embodiment, "abnormality (first abnormality)" refers to an abnormality that is unacceptable in terms of quality level, and "precursor (second abnormality)" refers to an abnormality in a preliminary stage that may become the first abnormality in the future. Image diagnostic methods are employed for these diagnoses. Furthermore, the diagnostic unit 108 identifies the cause of the precursor or abnormality from the diagnostic results of the inspection diagnosis or precursor diagnosis, and causes the printing unit 107 to automatically execute a process to repair the part causing the cause.

[0024] Precursor diagnosis identifies signs that are likely to lead to unacceptable abnormalities in the future, and does not require immediate repair after diagnosis. Furthermore, precursor diagnosis is basically performed on printed images while the user is printing. Image diagnosis is a diagnosis that identifies abnormalities and repairs them immediately. It is basically performed when printing is stopped. When image diagnosis is performed using the image forming apparatus 101 alone, an image diagnosis chart is printed, and the diagnosis is performed using the printed image. Image diagnosis is also used when analyzing the cause of an abnormality found on a printed material during inspection.

[0025] The recording materials that have passed through the diagnostic unit 108 are sequentially transported to the stacker 109. The stacker 109 is equipped with a stack tray 341. Printed recording materials transported from the diagnostic unit 108, which is located upstream in the transport direction of the printed recording materials, are loaded onto the stack tray 341. The printed recording materials that have passed through the diagnostic unit 108 pass through the transport path 344 inside the stacker 109. As the printed recording materials passing through the transport path 344 are guided to the transport path 345, they are loaded onto the stack tray 341.

[0026] The stacker 109 is further equipped with an escape tray 346 as a paper output tray. In this embodiment, the escape tray 346 is used to discharge recording material containing test charts used for image diagnosis by the diagnostic unit 108. Printed recording material passing through the transport path 344 is guided to the transport path 347 and then transported to the escape tray 346. Printed recording material that is transported without being stacked or discharged in the stacker 109 is transported to the downstream finisher 110 via the transport path 348. The escape tray 346 is also used to discharge printed recording material that has been determined to be defective by inspection by the diagnostic unit 108.

[0027] The stacker 109 further includes a reversal unit 349 for reversing the orientation of the printed recording material being transported. The reversal unit 349 is used, for example, to make the orientation of the recording material input to the stacker 109 the same as the orientation of the printed recording material when it is loaded onto the stack tray 341 and output from the stacker 109. Note that the reversal operation by the reversal unit 349 is not performed on printed recording material that is not loaded into the stacker 109 and is transported to the finisher 110.

[0028] The finisher 110 performs a finishing function specified by the user on the printed recording material transported from the diagnostic unit 108, which is located upstream in the transport direction of the printed recording material. In this embodiment, the finisher 110 has finishing functions such as stapling (single or double stapling), punching (two or three holes), and saddle stitching. The finisher 110 is equipped with two output trays 351 and 352. If no finishing process is performed by the finisher 110, the printed recording material transported to the finisher 110 is discharged to the output tray 351 via the transport path 353. If a finishing process such as stapling is performed by the finisher 110, the printed recording material transported to the finisher 110 is guided to the transport path 354. The finisher 110 uses the finishing processing unit 355 to perform a finishing process specified by the user on the printed recording material being transported along the transport path 354, and then ejects the finished printed recording material to the output tray 352.

[0029] <Functional Configuration Diagram> Figure 3 is a schematic diagram of the functional blocks of the image forming apparatus 101, the external controller 102, and the client PC 103.

[0030] <Image forming apparatus 101> The printing unit 107 of the image forming apparatus 101 includes a communication interface 201, a network interface 204, a video interface 205, a CPU 206, a memory 207, an HDD unit 208, a UI display unit 225, and an operation unit 226. The printing unit 107 further includes an image processing unit 202 and a print unit 203. These are connected to each other via a system bus 209 so that data can be sent and received from each other. The UI display unit 225 is an example of the "display means" of the present invention.

[0031] The communication interface 201 includes a communication module and is connected to the diagnostic unit 108, stacker 109, and finisher 110 via a communication cable 260. The CPU 206 communicates via the communication interface 201 for the control of each device. The network interface 204 includes a communication module such as a Network Interface Card (NIC) and is connected to the external controller 102 via the internal LAN 105 and is used for the communication of control data, etc. The video interface 205 includes a video module, etc. and is connected to the external controller 102 via a video cable 106 and is used for the communication of data such as image data. Note that the printing unit 107 (image forming apparatus 101) and the external controller 102 may be connected only by the video cable 106, provided that the operation of the image forming apparatus 101 can be controlled by the external controller 102.

[0032] The HDD unit 208 stores various programs and data. The CPU 206 controls the operation of the entire printing unit 107 by executing programs stored in the HDD unit 208. The memory 207 stores programs and data necessary for the CPU 206 to perform various processes. The memory 207 operates as the work area for the CPU 206. The UI display unit 225 is configured, for example, to include a touch panel display, and accepts input of various settings and operation instructions from the user, and is used to display print job management. For example, it displays the job management screen shown in Figure 4, allowing the user to perform touch or slide operations to check or change print jobs. The operation unit 226 is configured, for example, to include this touch panel display and buttons, and accepts touch or slide operations to instruct, for example, to change settings of the printing unit 107 and to execute various diagnostics.

[0033] The diagnostic unit 108 comprises a communication interface 211, a CPU 214, a memory 215, an HDD unit 216, image reading units 331 and 332, a UI display unit 241, and an operation unit 242. These devices are connected to each other via a system bus 219, enabling them to send and receive data. The communication interface 211 includes a communication module and is connected to the printing unit 107 via a communication cable 260. The CPU 214 performs the necessary communication for controlling the diagnostic unit 108 via the communication interface 211. The CPU 214 controls the operation of the diagnostic unit 108 by executing a control program stored in the memory 215. The memory 215 stores the control program for the diagnostic unit 108. The image reading units (331, 332) include, for example, a scanner and read images according to instructions from the CPU 214. In image diagnostics, the CPU 214 diagnoses whether there are any abnormalities in the image forming apparatus 101 based on the diagnostic images read by the image reading units (331, 332). In particular, during quality control, the CPU 214 reads the recording material printed by the image forming apparatus 101 via the image reading units (331, 332) and inspects the printed recording material for defects (abnormalities) based on the read images.

[0034] The UI display unit 241 is configured, for example, to include a touch panel display and is used to display the results of various diagnoses, the status of automatic repairs based on the diagnoses, and setting screens. The operation unit 242 is also configured to include this touch panel display and accepts touch or slide operations, for example, to change the settings of the diagnostic unit 108 and to instruct the execution of various diagnoses.

[0035] Figure 5 illustrates the diagnostic settings screen displayed on the UI display unit 241 of the diagnostic unit 108. The diagnostic settings screen allows you to set the inspection diagnostic level 501 and the predictive diagnostic setting 502. In the example shown in Figure 5, the inspection diagnostic level 501 is set to "normal" and the predictive diagnostic setting 502 is set to "implement," which are the default settings. As the inspection diagnostic level 501 changes in stages from "strict" to "normal" and then to "lenient," the size of the detected anomaly increases. Here, an example of the minimum detectable size at each level is the area shown in Figure 7. Although "strict," "normal," and "lenient" are displayed as inspection diagnostic levels, these are just examples, and the inspection diagnostic levels are not limited to these. For example, there may be diagnostic levels between "strict" and "normal," or between "normal" and "lenient," and there may be two, five, or any number of inspection diagnostic levels.

[0036] The HDD unit 216 stores setting information and image data necessary for various diagnostics. The setting information and image data stored in the HDD unit 216 can be reused. The stacker 109 controls whether the printed recording material that has passed through the transport path is ejected to the stack tray, ejected to the escape tray, or transported to the finisher 110 connected downstream in the transport direction of the printed recording material. The finisher 110 controls the transport and ejection of the printed recording material and performs finishing processes such as stapling, punching, or saddle stitching.

[0037] <External controller 102> The external controller 102 includes a CPU 251, memory 252, HDD unit 253, keyboard 256, display unit 254, network I / F (255, 257), and video I / F 258. These devices are connected to each other via a system bus 259, enabling them to send and receive data.

[0038] The CPU 251 controls the overall operation of the external controller 102, such as receiving print data from the client PC 103, performing RIP processing, and transmitting print data to the image forming apparatus 101, by executing programs stored in the HDD unit 253. The memory 252 stores programs and data necessary for the CPU 251 to perform various processes. The memory 252 operates as the work area for the CPU 251.

[0039] Various programs and data are stored in the HDD unit 253. The keyboard 256 is used to input operation instructions from the user to the external controller 102. The display unit 254 is, for example, a display and is used to display information about the application running on the external controller 102 and the operation screen. The network interface 255 is configured to include communication modules such as a NIC and a wireless circuit, and is connected to the client PC 103 via the external LAN 104 and is used for data communication such as print instructions. The network interface 257 is configured to include communication modules such as a NIC, and is connected to the image forming apparatus 101 via the internal LAN 105 and is used for data communication such as print instructions. The external controller 102 is configured to communicate with the printing unit 107, diagnostic unit 108, stacker 109, and finisher 110 via the internal LAN 105 and communication cable 260. The video interface 258 is configured to include a video module, is connected to the image forming apparatus 101 via video cable 106 and is used for data communication such as image data (print data).

[0040] <Client PC 103> The client PC 103 comprises a CPU 261, memory 262, HDD unit 263, display unit 264, keyboard 265, and network interface 266. These devices are connected to each other via a system bus 269, enabling them to send and receive data. The CPU 261 controls the operation of each device via the system bus 269 by executing programs stored in the HDD unit 263. This enables various processes to be performed by the client PC 103. For example, the CPU 261 generates print data and issues print commands by executing a document processing program stored in the HDD unit 263. The memory 262 stores programs and data necessary for the CPU 261 to perform various processes. The memory 262 operates as the work area of ​​the CPU 261.

[0041] The HDD unit 263 stores various applications such as document processing programs, printer drivers and other programs, and various data. The display unit 264 is, for example, a display and is used to display information about applications running on the client PC 103 and the operation screen. The keyboard 265 is used to input operation instructions from the user to the client PC 103. The network interface 266 is configured to include communication modules such as a NIC and a wireless circuit and is connected to the external controller 102 via the external LAN 104 for communication. The CPU 261 communicates with the external controller 102 via the network interface 266.

[0042] <Inspection and diagnostic processes and predictive diagnostic processes> Figure 6 is a flowchart illustrating the procedures for the inspection and diagnostic processes and the predictive diagnostic process performed during printing, which are initiated by a print command from the printing unit 107. The processes in Figure 6 are implemented, for example, by the CPU 206 of the printing unit 107 and the CPU 214 of the diagnostic unit 108 of the image forming apparatus 101 reading and executing programs stored in memory 207 and memory 215. Furthermore, the processes in Figure 6 are implemented, for example, by the CPU 251 of the external controller 102 reading and executing a program stored in memory 252. Also, the processes in Figure 6 are implemented, for example, by the CPU 251 of the client PC 103 reading and executing a program stored in memory 252. Before the start of the processes in Figure 6, the predictive diagnostic is set to "Perform".

[0043] In S601, the CPU 214 of the diagnostic unit 108 displays the diagnostic settings screen shown in Figure 5 in user mode on the UI display unit 241. The CPU 214 then accepts a slide operation of the arrow for the inspection diagnostic level 501 via the operation unit 242. The CPU 214 then sets the level indicated by this arrow as the inspection diagnostic level. Then, according to the setting of the inspection diagnostic level, the CPU 214 sets the detection size K for abnormalities in inspection, as shown in Figure 7, and sets the maximum size of abnormality to be detected. For example, if the inspection diagnostic level is set to "normal" as shown in Figure 5, the detection size K for abnormalities in inspection is set to 1.0 mm2. Details regarding the relationship between the inspection diagnostic level and the detection size area of ​​abnormalities shown in Figure 7 will be described later. Note that although this example shows the CPU 214 setting the detection size K from the user mode UI settings, the detection size K may also be set from the administrator mode settings or service mode settings.

[0044] In S602, the CPU 214 receives a slide operation of the arrow indicating the inspection diagnostic level 501 on the user mode diagnostic setting screen (Figure 5) via the operation unit 242. Then, it determines whether the inspection diagnostic level is set to "strict" according to the position of the arrow. If the CPU 214 detects that the arrow indicating the inspection diagnostic level is in the "strict" position, it determines that the inspection diagnostic level is set to "strict". The CPU 214 then sets the detection size K of the abnormality in the inspection to the limit size that the diagnostic unit 108 can detect (0.5 mm2) and proceeds to S603. On the other hand, if the CPU 214 does not detect that the arrow indicating the inspection diagnostic level is in the "strict" position, it does not determine that the inspection diagnostic level is set to "strict" and proceeds to S604. The CPU 214 may also determine whether the set value of the detection size K is 0.5 mm2 or less, and proceed to S603 if the set value is 0.5 mm2 or less, and otherwise proceed to S604.

[0045] In S603, the CPU 214 sets the warning diagnosis to "Do not perform" and changes the color of the "Do not perform" icon for the warning diagnosis setting as shown in Figure 8 (an example of "displaying in an identifiable manner that the second abnormality will not be diagnosed" in the present invention). In addition, the area for the warning diagnosis setting is grayed out (an example of "displaying the second setting as unselectable" in the present invention). In this way, it is indicated that the warning diagnosis setting is unselectable. Note that the CPU 214 in S603 is an example of the "setting means" in the present invention.

[0046] In the example above, the inspection diagnostic level and the implementation of predictive diagnostics can be set on the same diagnostic settings screen (Figures 5 and 8), but the inspection diagnostic level and the implementation of predictive diagnostics may also be set on separate screens. Figure 9 shows an example of the inspection diagnostic level setting screen, and Figure 10 shows an example of the predictive diagnostics implementation setting screen. Note that touching the OK icon on the settings screen shown in Figure 9 will transition to the settings screen shown in Figure 10.

[0047] More specifically, Figure 9(A) shows the case where the arrow icon indicating the inspection and diagnosis level is set to "normal," and Figure 9(B) illustrates the case where the arrow icon indicating the inspection and diagnosis level is set to "strict." When the arrow icon indicating the inspection and diagnosis level is set to "strict," the CPU 214 sets the predictive diagnosis to "do not perform." The CPU 214 then displays a pop-up containing a message indicating that the predictive diagnosis cannot be set to "perform," thereby alerting the user. This message is an example of the "message indicating that the diagnosis of the second abnormality cannot be performed when the first criterion is set to the strictest criterion among multiple criteria" of the present invention.

[0048] The CPU 214 then changes the color of the "Do not perform" icon on the settings screen shown in Figure 10(B). The CPU 214 then grays out the entire screen to indicate that the pre-diagnosis settings cannot be changed. On the other hand, if the CPU 214 does not detect that the arrow icon indicating the inspection diagnosis level is in the "strict" position, it displays a settings screen as shown in Figure 10(A) where either "Perform" or "Do not perform" the pre-diagnosis can be selected. The CPU 214 then accepts input for the pre-diagnosis settings via the operation unit 226.

[0049] Alternatively, the user can select an inspection and diagnostic level, and whether or not to perform a predictive diagnostic check may be automatically set according to the selected level. Figure 11 illustrates a settings screen where only the inspection and diagnostic level is selectable. If the arrow icon indicating the inspection and diagnostic level is in the "strict" position, the CPU 214 automatically sets the predictive diagnostic check to "do not perform". The CPU 214 then displays a pop-up message containing a message indicating that the predictive diagnostic check cannot be set to "perform", alerting the user. On the other hand, if the arrow icon indicating the inspection and diagnostic level is in the "normal" or "lenient" position, the CPU 214 automatically sets the predictive diagnostic check to "perform". The screen described above is just one example; the settings screen should be such that when the inspection and diagnostic level is set to "strict", the predictive diagnostic check is set to "do not perform".

[0050] In S604, the anomaly detection size for predictive diagnostics is set. More specifically, the anomaly detection size Z for predictive diagnostics is set according to the settings for inspection diagnostics and predictive diagnostics, as shown in Figure 7. More specifically, the anomaly detection size Z for predictive diagnostics is set to a value smaller than the size K.

[0051] In S605, the CPU 206 of the printing unit 107 displays a job management screen on the UI display unit 225, as shown in Figure 4. The user can input a print job by touching the print instruction 402 on the job management screen. The CPU 206 then accepts this print job via the operation unit 226. The CPU 206 then transmits the print job information to the external controller 102 via the network interface 204.

[0052] In step S606, the CPU 251 of the external controller 102 receives print job information from the printing unit 107 via the network interface 257. The CPU 251 then rasterizes the page to be printed and generates a bitmap for printing. In step S607, the CPU 251 transmits the rasterized bitmap data to the video interface 205 of the printing unit 107 via the video interface 258 and video cable 106. The CPU 206 of the printing unit 107 receives the bitmap data via the video interface 205 and performs printing.

[0053] In S608, the CPU 214 of the diagnostic unit 108 generates a reference image (an example of the "original image" in this invention) with modified resolution and other properties so that it can perform a difference comparison with the printed image read from the printed material in S610, using the bitmap that has been rasterized for printing. The reference image may be, for example, a normally printed image, and any normally printed image that can compare the difference with the image to be diagnosed and extract differences (abnormalities) in the image to be diagnosed is acceptable. Alternatively, the reference image may be generated from the image read by the image reading unit (331, 332) after reading the normally printed material. The image reading unit (331, 332) is an example of the "reading means" in this invention. In S609, the CPU 214 executes a process to have the printed material read by the image reading unit (331, 332). The CPU 214 then saves the read image as a diagnostic image in the HDD unit 216 of the diagnostic unit 108 and proceeds to S610.

[0054] In S610, the CPU 214 compares the reference image and the diagnostic image and generates differential image data to determine an anomaly in the printing unit 107. In S611, the CPU 214 derives the area of ​​the difference from the differential image data in S610 and determines whether this difference area is greater than the size K for anomaly detection in the inspection. If the CPU 214 determines that the difference area is greater than the size K, it determines that the inspection result is NG and proceeds to S612. On the other hand, if the CPU 214 determines that the difference area is less than or equal to the size K, it proceeds to S614.

[0055] In S612, the CPU 214 displays a job management screen on the UI display unit 241 indicating that the inspection result was NG. In S613, the stacker 109 discharges the printouts that failed inspection, which have been transported along the transport path, to the escape tray 346. The stacker 109 also discharges the printouts that did not fail inspection to the stack tray 341, or transports them to the finisher 110, which is connected downstream in the transport direction of the printed materials. By discharging only the printouts that failed inspection to the escape tray 346, the stacker 109 can distinguish between printouts that failed inspection and those that passed inspection.

[0056] In S614, the CPU 214 determines whether the setting for the precursor diagnosis is "implemented" or "not implemented". If the CPU 214 determines that the setting for the precursor diagnosis is "implemented", it proceeds to S615; if it determines that it is "not implemented", it proceeds to S618. In S615, the CPU 214 determines whether the difference area derived from the difference image data generated in S610 is greater than the anomaly detection size Z in the precursor diagnosis. If the CPU 214 determines that the difference area is greater than size Z, it proceeds to S616. On the other hand, if the CPU 214 determines that the difference area is less than or equal to size Z, it proceeds to S618.

[0057] In S616, the CPU 214 identifies the parts that are the precursors to the difference (anomaly) based on the characteristic information of the difference region. More specifically, the CPU 214 selects combinations of the same color with high similarity within the difference region, and identifies the parts causing the difference and the cause of the difference from the periodic information of the selected combinations. The characteristics of the difference region may be other than period, such as shape or directionality. The shape may be, for example, linear (hereinafter also called streaks) and dot (hereinafter also called dots). The directionality may be vertical or horizontal. The period may be, for example, the interval of anomalies formed on the printed material in the charger, developer, photosensitive drum, ITB unit, and secondary transfer. Figure 12 illustrates the relationship between such difference (anomaly) contributing parts, the cause of the difference, the repair content to repair this difference, and whether paper is required when repairing. The data shown in Figure 12 is pre-stored in memory 215. The CPU 214 then refers to this relationship data to identify the parts that are the cause of the difference, the cause of the difference, the repair details, and whether paper is needed for the repair, corresponding to the characteristics of the difference.

[0058] In S617, the CPU 214 saves the parts identified in S616 and the repair details to the HDD unit 216. In S618, the CPU 206 determines whether printing of all pages instructed to be printed in the print job has been completed. If the CPU 206 determines that printing has been completed, it proceeds to S619; otherwise, it returns to S606. In S619, the CPU 214 determines whether the repair details are stored in the HDD unit 216. If the CPU 214 determines that the repair details are stored, it determines whether actual repair is necessary. If the CPU 214 determines that repair is necessary, it proceeds to S620; otherwise, the flowchart process ends. In S620, the CPU 214 notifies the printing unit 107 of the repair details via the communication interface 211. Note that the CPU 214 in S620 is an example of the "output means" of the present invention. The printing unit 107 receives the repair details via the communication interface 201 from the CPU 206 and controls the execution of the repair details. The flowchart then ends.

[0059] <Regarding the relationship between inspection / diagnosis level and detection size> Figure 7 illustrates the relationship between the inspection diagnostic level, the detection size K of an anomaly in inspection, and the detection size Z of an anomaly in predictive diagnosis. Sizes K and Z are changed according to the respective settings of the inspection diagnostic level: "strict," "normal," and "lenient." In the example shown in Figure 7, the anomaly shape is a dot, and the detection size is defined by area (an example of "size"). However, for example, if the anomaly shape is a streak, the detection size may be defined by length, thickness, etc. (an example of "size"). Note that when the inspection diagnostic level is "strict," size K = 0.5 mm² is the detection limit of the image forming apparatus 101.

[0060] The dots shown in Figure 7 are abnormalities that occur when toner particles initially adhere to the drum or transfer belt, and then grow into dots using the attached toner as a nucleus. Therefore, in order to detect the precursors to the growth of these dots, the detection size Z is set to be smaller than the detection size K. Also, if the precursor diagnosis is set to "perform", the size Z is set to a value that does not exceed the detection limit of the diagnostic unit 108. On the other hand, if the precursor diagnosis is set to "do not perform", the size Z is set to a value that exceeds the detection limit of the diagnostic unit 108.

[0061] In other words, in the example in Figure 5, the inspection and diagnosis level is set to "normal," and the predictive diagnosis is set to "perform." In this case, size Z is set to a value smaller than size K and not exceeding the detection limit of the diagnostic unit 108 (for example, 0.5 mm²). On the other hand, in the example in Figure 8, the inspection and diagnosis level is set to "strict," and the predictive diagnosis is set to "do not perform." In this case, size Z is set to a value smaller than size K and exceeding the detection limit of the diagnostic unit 108 (for example, 0.2 mm²). Note that 0.2 mm² is an example of the "criterion for which the second abnormality cannot be detected" in the present invention. However, when size Z is set to 0.2 mm², the detection limit of the image forming apparatus 101 is 0.5 mm², so in reality, dots smaller than 0.5 mm² cannot be detected. Nevertheless, even in this case, programs such as data analysis for predictive diagnosis are executed unnecessarily. Therefore, according to the image forming system 1 of the first embodiment, in such cases, the predictive diagnosis is set to "do not perform" as in S603 above, thereby preventing the unnecessary execution of the predictive diagnosis.

[0062] <Repair contents> Using Figure 12, the relationship between the factor parts and causes of the difference (anomalies) corresponding to the characteristics of the difference, the repair content for repairing this difference, and whether paper is required when repairing is explained. The CPU 214 of the diagnostic unit 108 detects the shape of the difference, the directionality of the shape, and the period of the difference from the difference image. Then, by referring to this table information, the CPU 214 identifies the factor parts and causes of the difference corresponding to the difference image.

[0063] More specifically, the CPU 214 detects, for example, that horizontal streaks appear in the difference image and that their period indicates they are caused by the photosensitive drum. Such detection may be achieved, for example, by using known image processing techniques or independently developed algorithms. Note that streaks refer to linear abnormalities on, for example, drums or belts. The CPU 214 then refers to the table shown in Figure 12 and identifies the contributing part as the photosensitive drum and the cause as poor cleaning of the photosensitive drum. The CPU 214 then decides on cleaning the cleaning blade of the photosensitive drum as the repair method (an example of "removal of the cause of the second abnormality" in the present invention). Then, as described above, the printing unit 107 performs cleaning of the cleaning blade of the photosensitive drum. In this way, the repair of the cleaning blade of the photosensitive drum is performed.

[0064] Alternatively, the CPU 214 may detect, for example, that a dot has appeared in the differential image, and that its period indicates it is caused by the photosensitive drum. The CPU 214 then refers to the table shown in Figure 12 and identifies the photosensitive drum as the causative component, and that the cause is dust adhering to the photosensitive drum. The CPU 214 then decides to clean the photosensitive drum as the repair procedure. As described above, the printing unit 107 then performs the cleaning of the photosensitive drum. In this way, the repair of the photosensitive drum is carried out.

[0065] In this way, the cause of the anomaly is identified from the shape, direction, or period of the difference (anomaly) observed in the difference image, and a repair method appropriate to the cause is selected and the repair is carried out. Note that the contents of the table in Figure 12 are only a part of the repair methods, and the repair methods are not limited to these.

[0066] <Effects and Actions> According to the image forming system 1 described above, if the inspection and diagnosis level is set to "strict," predictive diagnosis is not performed. With this image forming system 1, it is possible to prevent predictive diagnosis from being wasted by performing the diagnosis when the detection size Z in predictive diagnosis is set to a value that exceeds the detection limit of the image forming apparatus 101. In addition, by not performing predictive diagnosis, it is possible to suppress repair work and cleaning work that does not require immediate attention. Therefore, it is possible to suppress the loss of opportunities for the user due to the shutdown of the image forming apparatus 101 and prevent a decrease in the user's productivity.

[0067] (Second Embodiment) In the first embodiment, an example was described in which a precursor diagnosis is not performed even if an anomaly detection size Z is set in the precursor diagnosis, when the inspection diagnosis level 501 is set to "strict". In the second embodiment, an example is described using Figures 13 and 14 in which a precursor diagnosis is not performed depending on the anomaly detection size Z in the precursor diagnosis. Processes common to Figure 6 are given the same reference number and their explanations are omitted.

[0068] Figure 14 illustrates the levels of early detection. The early detection level can be set from three options: "early detection," "standard detection," and "late detection." "Early detection" is set, for example, when you want to detect a problem early, even if it will require frequent repairs. On the other hand, "late detection" is set, for example, when you want to reduce the frequency of repairs. Note that the setting of the early detection level may be performed by a service technician (not shown in the figure).

[0069] Figure 14 illustrates the detection size Z when the early detection level is set to "early detection". In the first embodiment, as shown in Figure 7, when the diagnostic level in inspection is set to "lenient", the detection size Z is set to 1.0 mm². However, in the second embodiment, when the early detection level is set to "early detection", and the diagnostic level in inspection is set to "lenient", the detection size Z is set to 0.5 mm². Similarly, when the diagnostic level in inspection is set to "normal", the size Z is set to 0.2 mm², and when it is set to "strict", it is set to 0.1 mm².

[0070] By the way, in the second embodiment, even when the diagnostic level setting in inspection is set to "normal" instead of "strict," the detection size Z is set to 0.2, which is below the detection limit size of the diagnostic unit 108. In such cases, when the process shown in Figure 6 of the first embodiment is executed, a precursor diagnosis may be performed even though no precursor to an abnormality can be detected. Therefore, in the second embodiment, as shown in Figure 16, a message is displayed on the diagnostic screen indicating that a precursor diagnosis may not be possible. This is an example of the present invention's provision that "if the first setting is set to a standard other than the strictest of several standards, a message is displayed on the screen indicating the possibility that a second abnormality will not be diagnosed."

[0071] <Inspection and diagnostic processes and predictive diagnostic processes> The procedures for the inspection and diagnostic processing and the predictive diagnostic processing according to the second embodiment will be explained using Figure 13. Note that the processing in Figure 13 is realized, for example, by the CPU 206 of the printing unit 107 and the CPU 214 of the diagnostic unit 108 of the image forming apparatus 101 reading and executing programs stored in memory 207 and memory 215. Furthermore, the processing in Figure 13 is realized, for example, by the CPU 251 of the external controller 102 reading and executing a program stored in memory 252. Also, the processing in Figure 13 is realized, for example, by the CPU 251 of the client PC 103 reading and executing a program stored in memory 252. Note that before the start of the processing in Figure 13, the predictive diagnostic setting is set to "Perform".

[0072] In S601, the CPU 214 of the diagnostic unit 108 displays the diagnostic settings screen shown in Figure 5 in user mode on the UI display unit 241. The CPU 214 then accepts the setting input for the inspection diagnostic level 501 via the operation unit 242. The CPU 214 then sets the abnormality detection size K in the inspection, as shown in Figure 14, according to the setting of the inspection diagnostic level, and sets the maximum size of abnormality to be detected. For example, as shown in Figure 15, if the inspection diagnostic level is set to "normal", the abnormality detection size K in the inspection is set to 1.0 mm2.

[0073] In S1301, the CPU 214 sets the detection size Z for predictive diagnostics according to the inspection and diagnostic level setting, and determines the maximum size of predictive abnormalities to be detected. That is, in the example setting screen shown in Figure 15, the arrow indicating inspection and diagnostic level 501 is positioned as "normal". Therefore, the CPU 214 sets the abnormality detection size Z for predictive diagnostics to, for example, 0.2 mm², which allows for early detection of predictive abnormalities (Figure 14).

[0074] In S1302, the CPU 214 determines whether the detection size Z is less than 0.5 mm2, the maximum size detectable by the diagnostic unit 108. If the detection size Z is 0.5 mm2, the process proceeds to S603; otherwise, it proceeds to S604. In S603, the CPU 214 sets the predictive diagnostic to "Do not perform" and changes the color of the "Do not perform" icon in the predictive diagnostic settings, as shown in Figure 15. It also grays out the area for predictive diagnostic settings. This indicates that the predictive diagnostic setting cannot be selected. Thus, even when the diagnostic level is set to "normal," if the detection size of the abnormality in the predictive diagnostic is less than 0.5 mm2, the predictive diagnostic is not performed.

[0075] <Effects and Actions> The image forming apparatus 101 according to the second embodiment also achieves the same effects as the image forming apparatus 101 according to the first embodiment. In addition, the image forming apparatus 101 according to the second embodiment can determine whether or not to perform a predictive diagnosis even if the diagnostic level setting in the inspection is not "strict". Therefore, predictive diagnosis can be performed more efficiently.

[0076] (Third embodiment) In the third embodiment, the inspection diagnostic level and whether or not to perform a predictive diagnostic are set on the diagnostic settings screen according to the shape of the abnormality (dot, streak, etc.). More specifically, as shown in Figure 17, the inspection diagnostic level 501 is displayed as configurable on the diagnostic settings screen for both dots and streaks. Also, as shown in Figure 18, the predictive diagnostic setting 502 is displayed as configurable on the predictive diagnostic settings screen for both dots and streaks.

[0077] Figure 17 illustrates a diagnostic settings screen where the arrow indicating Pochi's inspection diagnostic level is set to "strict," and the arrow indicating Suji's inspection diagnostic level is set to "normal." In this case, the CPU 214 changes the color of the "Do not perform" icon for Pochi's predictive diagnostic settings, where the inspection diagnostic level is set to "strict," on the predictive diagnostic settings screen in Figure 18. The CPU 214 also grays out the entire setting area for Pochi to indicate that this setting cannot be changed. On the other hand, the CPU 214 changes the color of the "Perform" icon for Suji's predictive diagnostic settings, where the inspection diagnostic level is set to "normal."

[0078] <Effects and Actions> The image forming apparatus 101 according to the third embodiment also achieves the same effects as the image forming apparatus 101 according to the first embodiment. In addition, the image forming apparatus 101 according to the third embodiment allows for setting the implementation of a precursor diagnosis according to the shape of the abnormality. Therefore, the precursor diagnosis can be performed more efficiently.

[0079] <Variation> In the diagnostic settings screen shown in Figure 5, if the precursor diagnostic setting 502 is set to "Perform", the CPU 214 may display the "Strict" option for the inspection diagnostic level 501 as unavailable. This display is an example of the present invention's principle that "when the second setting is set to diagnose a second abnormality, the first criterion, which is the strictest of the multiple criteria, is displayed as unavailable."

[0080] Furthermore, if the system is set not to perform a premonitory diagnosis in S603, the judgment processes in S614 to S616 do not need to be performed. Also, in S608, the image forming apparatus 101 may receive a reference image generated outside the image forming apparatus 101 via the external LAN 104 and the internal LAN 105. Also, in S609, the CPU 214 may receive a diagnostic image read outside the image forming apparatus 101 via the external LAN 104 and the internal LAN 105. Also, in S617, the CPU 206 may transmit the identified part and repair details to the client PC 103 via the external LAN 104 and the internal LAN 105. The client PC 103 may then transmit a repair instruction including these repair details to another image forming apparatus 101 via the network.

[0081] <Other Embodiments> The present invention can also be realized by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be realized by a circuit (e.g., an ASIC) that implements one or more functions.

[0082] The invention is not limited to the embodiments described above, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, claims are attached to disclose the scope of the invention.

[0083] The disclosures herein include the following image forming apparatus, control method thereof, and program. (Item 1) An image forming apparatus, A diagnostic means for diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The system includes a setting means for setting whether or not to perform the diagnosis of the second abnormality, The image forming apparatus is characterized in that, if the second criterion is a criterion that makes it impossible to detect the second abnormality by the diagnostic means, the setting means is set not to diagnose the second abnormality. (Item 2) The image forming apparatus according to item 1, characterized in that if the first criterion is the same as the limit to which the diagnostic means can detect the first abnormality or is a criterion that makes it impossible to detect the first abnormality, or if the second criterion is a criterion that makes it impossible to detect the second abnormality by the diagnostic means, the setting means is set not to diagnose the second abnormality. (Item 3) The image forming apparatus according to item 1 or 2, characterized in that the setting means sets the second abnormality not to be diagnosed when the first criterion is set to the strictest criterion among a plurality of criteria. (Item 4) The image forming apparatus according to any one of items 1 to 3, characterized in that, if the second criterion is set to a size that cannot be detected by the diagnostic means, the setting means sets not to diagnose the second abnormality. (Item 5) The image forming apparatus according to item 3, characterized in that the second criterion can be set in stages for each of the multiple first criteria. (Item 6) The image forming apparatus according to any one of items 1 to 5, characterized in that the first criterion can be set for each type of the first abnormality. (Item 7) The system further comprises a reading means for reading the image formed on the sheet, The image forming apparatus according to any one of items 1 to 6, characterized in that the diagnostic means diagnoses whether or not the image read by the reading means has the first abnormality and the second abnormality, using the difference between the original image of the image before it is formed on the sheet and the image read by the reading means. (Item 8) The image forming apparatus according to any one of items 1 to 7, further comprising an output means that outputs content for removing the cause of the second abnormality when the diagnostic means diagnoses that the second abnormality exists. (Item 9) The image forming apparatus according to any one of items 1 to 8, further comprising a display means for displaying on a screen a first setting for setting the first criterion and a second setting for setting whether or not to perform the diagnosis of the second abnormality. (Item 10) The aforementioned display means is If the second setting is set not to diagnose the second abnormality, the system will display in an identifiable manner that the second abnormality will not be diagnosed. The image forming apparatus according to item 9, characterized in that the second setting is displayed as unavailable. (Item 11) The image forming apparatus according to item 9 or 10, characterized in that the display means displays on the screen that, if the first setting is set to a setting other than the most stringent of the multiple criteria, the second setting is set not to diagnose the second abnormality. (Item 12) The image forming apparatus according to any one of items 9 to 11, characterized in that the display means displays a message on the screen indicating the possibility that the second abnormality may not be diagnosed when the first setting is set to a setting other than the most stringent of the multiple criteria. (Item 13) The image forming apparatus according to any one of items 9 to 12, characterized in that when the second setting is set to diagnose the second abnormality, the first criterion displays the first setting, which is the most severe of the multiple criteria, as unavailable. (Item 14) The image forming apparatus according to any one of items 9 to 13, characterized in that the display means displays a message on the screen indicating that the diagnosis of the second abnormality cannot be performed when the first criterion is set to the strictest criterion among a plurality of criteria. (Item 15) The image forming apparatus according to any one of items 9 to 14, characterized in that the display means displays the first setting and the second setting on a single screen. (Item 16) The image forming apparatus according to any one of items 9 to 14, characterized in that the display means displays the first setting and the second setting on separate screens. (Item 17) A method for controlling an image forming apparatus, A diagnostic means includes a diagnostic step of diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The setting means includes a setting step of determining whether or not to perform the diagnosis of the second abnormality, If the second criterion is such that the diagnostic means cannot detect the second abnormality, the setting means sets the diagnostic means not to diagnose the second abnormality. A control method for an image forming apparatus. (Item 18) A program for causing a computer to execute each step in a control method for an image forming apparatus, wherein the control method is: A diagnostic means includes a diagnostic step of diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The setting means includes a setting step of determining whether or not to perform the diagnosis of the second abnormality, If the second criterion is such that the diagnostic means cannot detect the second abnormality, the setting means sets the diagnostic means not to diagnose the second abnormality. program. [Explanation of Symbols]

[0084] 1: Image forming system, 100: Printing system, 101: Image forming apparatus, 102: External controller, 103: Client PC, 107: Printing unit, 108: Diagnostic unit, 206, 214, 251, 261: CPU, 207, 215, 252, 262: Memory, 208, 216, 253, 263: HDD unit, 225, 241: UI display unit, 226, 242: Operation unit, 331: Image reading unit, 501: Inspection and diagnostic level, 502: Precursor diagnostic setting

Claims

1. An image forming apparatus, A diagnostic means for diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The system includes a setting means for setting whether or not to perform the diagnosis of the second abnormality, The image forming apparatus is characterized in that, if the second criterion is a criterion that makes it impossible to detect the second abnormality by the diagnostic means, the setting means is set not to diagnose the second abnormality.

2. The image forming apparatus according to claim 1, characterized in that if the first criterion is the same as the limit to which the diagnostic means can detect the first abnormality or is a criterion that makes it impossible to detect the first abnormality, or if the second criterion is a criterion that makes it impossible to detect the second abnormality by the diagnostic means, the setting means is set not to diagnose the second abnormality.

3. The image forming apparatus according to claim 1, characterized in that the setting means is set not to diagnose the second abnormality when the first criterion is set to the strictest criterion among a plurality of criteria.

4. The image forming apparatus according to claim 1, characterized in that, if the second criterion is set to a size that cannot be detected by the diagnostic means, the setting means is set not to diagnose the second abnormality.

5. The image forming apparatus according to claim 3, characterized in that the second criterion can be set in stages for each of the plurality of first criteria.

6. The image forming apparatus according to claim 1, characterized in that the first criterion can be set for each type of the first abnormality.

7. The system further comprises a reading means for reading the image formed on the sheet, The image forming apparatus according to claim 1, characterized in that the diagnostic means diagnoses whether or not the image read by the reading means has the first abnormality and the second abnormality using the difference between the original image of the image before it is formed on the sheet and the image read by the reading means.

8. The image forming apparatus according to claim 1, further comprising an output means that outputs content for removing the cause of the second abnormality when the diagnostic means diagnoses that the second abnormality exists.

9. The image forming apparatus according to any one of claims 1 to 8, further comprising a display means for displaying on a screen a first setting for setting the first criterion and a second setting for setting whether or not to perform the diagnosis of the second abnormality.

10. The aforementioned display means is If the second setting is set not to diagnose the second abnormality, the fact that the second abnormality is not diagnosed is displayed in an identifiable manner. The image forming apparatus according to claim 9, characterized in that the second setting is displayed as unavailable.

11. The image forming apparatus according to claim 9, characterized in that the display means displays on the screen that, if the first setting is set to a setting other than the strictest of the multiple criteria, the second setting is set not to diagnose a second abnormality.

12. The image forming apparatus according to claim 9, characterized in that the display means displays a message on the screen indicating the possibility that the second abnormality may not be diagnosed if the first setting is set to a setting other than the strictest of the multiple criteria.

13. The image forming apparatus according to claim 9, characterized in that when the second setting is set to diagnose the second abnormality, the first criterion is set to display as unavailable, where the first setting is the most severe of the multiple criteria.

14. The image forming apparatus according to claim 9, characterized in that the display means displays a message on the screen indicating that the diagnosis of the second abnormality cannot be performed when the first criterion is set to the strictest criterion among a plurality of criteria.

15. The image forming apparatus according to claim 9, characterized in that the display means displays the first setting and the second setting on a single screen.

16. The image forming apparatus according to claim 9, characterized in that the display means displays the first setting and the second setting on separate screens.

17. A method for controlling an image forming apparatus, A diagnostic means includes a diagnostic step of diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The setting means includes a setting step of determining whether or not to perform the diagnosis of the second abnormality, If the second criterion is such that the diagnostic means cannot detect the second abnormality, the setting means is set not to diagnose the second abnormality. A control method for an image forming apparatus.

18. A program for causing a computer to execute each step in a control method for an image forming apparatus, wherein the control method is: A diagnostic means includes a diagnostic step of diagnosing a first abnormality in an image formed on a sheet based on a first criterion, and diagnosing a second abnormality based on a second criterion that is stricter than the first criterion, The setting means includes a setting step of determining whether or not to perform the diagnosis of the second abnormality, If the second criterion is such that the diagnostic means cannot detect the second abnormality, the setting means is set not to diagnose the second abnormality. program.

Images