Conveyance state determination system and program

Abstract

To provide a conveyance state determination system and a program that can prevent waste of sheets and reduction in productivity.SOLUTION: A conveyance state determination system (image forming system 10) comprises: a first acquisition unit (control unit 210) that acquires actual state information corresponding to a change in the speed of sheets on a sheet conveyance path on the basis of results of detection performed by a plurality of sheet detection sensors 260 arranged on the conveyance path; a second acquisition unit (control unit 210) that acquires reference state information to be compared with the actual state information; and an output unit (control unit 210) that compares the actual state information with the reference state information to output evaluation information for evaluating the state of a conveying device (image forming apparatus 200) that conveys the sheets by using the conveyance path.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a transport state determination system and a program. [Background technology]

[0002] 2. Description of the Related Art Image forming apparatuses that form images on paper are known in the art. In image forming apparatuses, problems may occur in the transport of paper depending on the state of the image forming apparatus.

[0003] In this regard, Patent Document 1 describes a technology that collects and analyzes jam information to calculate, diagnose, and display the risk of failure in order to prevent failures in image forming devices in advance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-323455 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the invention described in Patent Document 1 is a method for analyzing jam information when a jam has already occurred. Therefore, it is difficult to prevent a jam in advance, which leads to the problem of wasting paper due to the jam. In addition, because it is difficult to prevent a jam in advance, it leads to the problem of the image forming apparatus stopping due to the jam, which reduces productivity.

[0006] An object of the present invention is to provide a transport state determination system and program that can suppress paper waste and reduced productivity. [Means for solving the problem]

[0007] The transport state determination system described in claim 1 is made to achieve the above object, a first acquisition unit that acquires actual state information corresponding to a change in speed of the paper on the paper transport path based on detection results of a plurality of paper detection sensors arranged on the paper transport path; a second acquisition unit that acquires reference state information to be compared with the actual state information; an output unit that compares the actual state information with the reference state information to output evaluation information for evaluating the state of a conveying device that conveys the paper through the conveying path; Equipped with.

[0008] The invention described in claim 2 is the transport state determination system described in claim 1, The evaluation information is information corresponding to whether the transport device is normal or abnormal.

[0009] The invention described in claim 3 is the transport state determination system described in claim 1, The evaluation information is the conformance rate between the actual state information and the reference state information in a normal state of the transport device, or the conformance rate between the actual state information and the reference state information in a predetermined abnormal state of the transport device.

[0010] The invention described in claim 4 is the transport state determination system described in claim 1, The evaluation information is information indicating a change in the conformance rate between the actual state information and the reference state information in a normal state of the conveying device, or information indicating a change in the conformance rate between the actual state information and the reference state information in a specified abnormal state of the conveying device.

[0011] The invention described in claim 5 is the transport state determination system described in claim 1, The reference state information includes a data set corresponding to a change in the speed of the sheet on the transport path when the transport device is in a normal state.

[0012] The invention described in claim 6 is the transport state determination system described in claim 1, The reference state information includes a data set corresponding to the speed change of the paper on the transport path when the transport device is in a normal state, and a data set corresponding to the speed change of the paper on the transport path when the transport device is in a predetermined abnormal state.

[0013] The invention described in claim 7 is the conveyance state determination system described in claim 1, The actual state information and the reference state information include a data set corresponding to a change in the speed of the sheet in accordance with the timing at which the sheet passes through a plurality of sections on the transport path.

[0014] The invention described in claim 8 is the transport state determination system described in claim 1, The actual state information and the reference state information include a data set corresponding to a change in the speed of a plurality of sheets of paper depending on the timing of the sheets passing through the transport path.

[0015] The invention described in claim 9 is the transport state determination system described in claim 1, The reference state information includes an estimate by a state space model.

[0016] The invention described in claim 10 is the transport state determination system described in claim 1, At least one of the actual state information and the reference state information includes a data set corrected based on paper characteristic information indicating characteristics of the paper.

[0017] The invention described in claim 11 is the transport state determination system described in claim 10, The paper characteristic information is information corresponding to the characteristics of the paper detected by the media sensor.

[0018] The invention described in claim 12 is the transport state determination system described in claim 1, A notification unit is provided to notify the user of the evaluation information.

[0019] The invention described in claim 13 is the transport state determination system described in claim 1, The evaluation information is a conformance rate between the actual state information for each type of abnormal state of the transport device and the reference state information in the abnormal state of the transport device.

[0020] The invention described in claim 14 is the transport state determination system described in claim 1, The first acquisition unit acquires in real time detection results of the plurality of paper detection sensors corresponding to changes in speed of the paper on the transport path.

[0021] The program according to claim 15 comprises: The computer of the transport status determination system a first acquisition unit that acquires actual state information corresponding to a change in speed of the paper on the paper transport path based on detection results of a plurality of paper detection sensors arranged on the paper transport path; a second acquisition unit that acquires reference state information to be compared with the actual state information; an output unit that compares the actual state information with the reference state information to output evaluation information for evaluating the state of a conveying device that conveys the paper through the conveying path; Function as. [Effects of the Invention]

[0022] According to the present invention, paper waste and reduced productivity can be suppressed. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a diagram showing a schematic configuration of an image forming system according to an embodiment of the present invention; [Figure 2] FIG. 2 is a functional block diagram showing a control structure of the image forming system according to the present embodiment. [Figure 3A] FIG. 6 is a diagram illustrating an example of a detection signal from a paper detection sensor. [Figure 3B] 10A and 10B are diagrams showing the times when the leading edge or trailing edge of the paper is detected by the paper detection sensor. [Figure 4]FIG. 10 is a diagram showing an example of a data set acquired by a paper detection sensor. [Figure 5] 10 is a flowchart showing a transport state determination process. [Figure 6] 10 is a flowchart showing a transport state determination process according to the first modification. [Figure 7] 10 is a flowchart showing a transport state determination process according to a second modified example. [Figure 8] 13 is a flowchart showing a transport state determination process according to a third modified example. [Figure 9] FIG. 4 is a diagram illustrating an example of a display screen displayed on a display unit. [Figure 10] FIG. 10 is a diagram illustrating an example of a correction coefficient table. [Figure 11] 13 is a flowchart showing a transport state determination process according to a fourth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0025] <1. Image Forming System Configuration> 1 shows a schematic configuration of an image forming system 10 according to this embodiment, and FIG. 2 shows a functional block diagram showing the control structure of the image forming system 10. 1 and 2, an image forming system 10 serving as a transport state determination system according to this embodiment includes a paper feeder 100, a paper information detection device 400, an image forming device 200, and a post-processing device 300. In the image forming system 10, the paper feeder 100, the paper information detection device 400, the image forming device 200, and the post-processing device 300 are connected in this order along the transport direction of the paper P. The image forming system 10 supplies the paper P loaded in the paper feeder 100 to the image forming device 200 via the paper information detection device 400. Next, the image forming system 10 forms an image on the paper P using the image forming device 200, and then conveys the paper P from the image forming device 200 to the post-processing device 300. Next, the image forming system 10 performs a predetermined post-processing on the paper P after the image formation process using the post-processing device 300, and then discharges the paper P from the post-processing device 300.

[0026] <1-1. Paper feeder configuration> In the image forming system 10, the paper feeder 100 stores paper P for image formation and supplies paper P to the image forming apparatus 200 via the paper information detection device 400 in accordance with an image formation job. As shown in FIG. 1, the paper feeder 100 includes a conveying unit 110, a paper supply unit 120, etc.

[0027] The paper supply unit 120 includes, for example, a plurality of paper supply trays arranged inside the paper feeder 100. The paper supply unit 120 is capable of holding a plurality of sheets of paper P in a stacked state. In the example shown in FIG. 1, the paper feeder 100 includes four paper supply units 120 arranged one above the other. Each paper supply unit 120 individually stores paper of different types, sizes, etc.

[0028] The transport unit 110 includes take-out rollers (not shown) that take out the paper P from each paper supply unit 120, and a plurality of transport rollers 111 that are provided along a predetermined transport path and transport the paper P. The transport path of the transport unit 110 merges the plurality of paper supply units 120 into one path and is connected to the paper information detection device 400. As a result, the transport unit 110 drives the transport rollers 111 to transport the paper P fed out from the paper supply unit 120 to the paper information detection device 400.

[0029] <1-2. Configuration of the paper information detection device> The paper information detection device 400 is connected to the rear stage of the paper feeder 100. The paper information detection device 400 includes a control unit 410, a transport unit 420, and a media sensor 430.

[0030] The control unit 410 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like, and controls the overall operation of each unit of the paper information detection device 400.

[0031] The transport section 420 includes a plurality of roller pairs and transports the paper P transported from the paper feeder 100 to the image forming apparatus 200 or the purge tray 440. The transport section 420 includes a transport path 421 connected to the image forming apparatus 200, and a transport path 422 branching from the transport path 421 and connected to the purge tray 440.

[0032] The media sensor 430 detects paper characteristic information, which is a value that indicates the physical property value of the paper P or the current, voltage, or other characteristic of a sensor corresponding to the physical property value of the paper P. The paper characteristic information is information that corresponds to the characteristics of the paper P. The media sensor 430 includes a size sensor 431, a paper thickness sensor 432, a basis weight sensor 433, and a moisture percentage sensor 434 on the transport path 421. The size sensor 431, the paper thickness sensor 432, the basis weight sensor 433, and the moisture percentage sensor 434 detect paper characteristic information corresponding to the size, paper thickness, basis weight, and moisture percentage, respectively, while transporting the paper P transported along the transport path 421 at the transport speed during image formation, without stopping the paper P. The media sensor 430 includes a stiffness sensor 435, a surface property sensor 436, and a resistance sensor 437 on the conveying path 422. The stiffness sensor 435 and the surface property sensor 436 are arranged upstream (below) the resistance sensor 437. In the example shown in FIG. 1 , the stiffness sensor 435 and the surface property sensor 436 are arranged in this order in the conveying direction (Z direction), but this order may be reversed. The stiffness sensor 435, the surface property sensor 436, and the resistance sensor 437 stop the paper P at their respective sensor positions to perform detection, and then send the paper P to the next sensor downstream. The conveying unit 420 ejects the paper P, after measurements by the stiffness sensor 435, the surface property sensor 436, and the resistance sensor 437, to the purge tray 440 without conveying it to the image forming apparatus 200.

[0033] The size sensor 431 is disposed on the most upstream side of the media sensors 430. The size sensor 431 measures a physical quantity corresponding to the size of the paper P and outputs the measurement result. The size sensor 431 is, for example, an image sensor, and detects the edge of the paper P by photographing the paper P as it is conveyed. The paper thickness sensor 432 is disposed second from the upstream side among the media sensors 430. The paper thickness sensor 432 measures a physical quantity corresponding to the thickness of the paper and outputs the measurement result. The basis weight sensor 433 and the moisture percentage sensor 434 are arranged downstream of the paper thickness sensor 432. The basis weight sensor 433 and the moisture percentage sensor 434 are arranged side by side at the same position in the transport direction (X direction) of the paper P and at different positions in the width direction (Y direction). The basis weight sensor 433 measures a physical quantity corresponding to the basis weight of the paper and outputs the measurement result. The moisture percentage sensor 434 measures a physical quantity corresponding to the moisture content (moisture percentage) of the paper and outputs the measurement result.

[0034] The stiffness sensor 435 measures a physical quantity corresponding to the stiffness of the paper sheet P and outputs the measurement result. The surface property sensor 436 measures the presence or absence of a coating on the surface of the paper P, the type of coating if present, and the surface properties such as surface roughness or smoothness, and outputs the measurement results. The resistance sensor 437 measures the electrical resistance of the paper P and outputs the measurement result.

[0035] <1-3. Configuration of image forming device> Image forming apparatus 200 is connected to the rear stage of paper information detection device 400. Image forming apparatus 200 forms an image on paper P transported from paper information detection device 400. Image forming apparatus 200 includes control unit 210, operation display unit 220, scanner 230, image forming unit 240, transport unit 250, paper detection sensor 260, memory unit 270, and communication unit 280.

[0036] The control unit 210 has a CPU and memory, and controls the entire image forming apparatus 200. The CPU is a control circuit composed of a multi-core processor or the like that controls the above-mentioned units and executes various arithmetic processing according to a program. Each function of the image forming apparatus 200 is realized by the CPU executing the corresponding program. The memory is a high-speed accessible main storage device that temporarily stores programs and data as a working area. The memory is, for example, DRAM, SDRAM, SRAM, etc. In this embodiment, the control unit 210 controls the paper feeder 100. The control unit 210 controls the paper information detection device 400 via the control unit 410. The control unit 210 controls the post-processing device 300.

[0037] The operation display unit 220 includes an operation unit and a display unit. The display unit includes a display device such as an LCD (Liquid Crystal Display), and displays various screens according to instructions of a display signal input from the control unit 210. The operation unit includes a touch panel formed to cover the display screen of the display unit, and various operation buttons such as numeric buttons, a start button, etc. The operation unit outputs operation signals based on user operations to the control unit 210. The operation unit accepts operation instructions from the user.

[0038] Scanner 230 optically scans an original document transported from an ADF (Auto Document Feeder) onto a contact glass or placed on the contact glass. Next, scanner 230 scans light from a light source onto the original document, and forms an image of the reflected light on the light receiving surface of a CCD (Charge Coupled Device) sensor to read the original document image. Next, scanner 230 A / D converts the scanned image to generate image data.

[0039] Image forming unit 240 forms an image on paper P based on image data. Image forming unit 240 includes photoconductor drums 241Y, 241M, 241C, and 241K corresponding to the colors yellow (Y), magenta (M), cyan (C), and black (K), charging units 242Y, 242M, 242C, and 242K, exposure units 243Y, 243M, 243C, and 243K, developing units 244Y, 244M, 244C, and 244K, and primary transfer rollers 245Y, 245M, 245C, and 245K. Image forming unit 240 also includes an intermediate transfer belt 246, a secondary transfer roller 247, and a fixing unit 248.

[0040] The charging sections 242Y, 242M, 242C, and 242K uniformly charge the photosensitive drums 241Y, 241M, 241C, and 241K, respectively. The exposure units 243Y, 243M, 243C, and 243K include a laser light source, a polygon mirror, a lens, etc. The exposure units 243Y, 243M, 243C, and 243K scan and expose the surfaces of the photosensitive drums 241Y, 241M, 241C, and 241K, respectively, with a laser beam based on image data for each color to form an electrostatic latent image. The developing units 244Y, 244M, 244C, and 244K develop the electrostatic latent images on the photosensitive drums 241Y, 241M, 241C, and 241K by applying toner of each color to the electrostatic latent images.

[0041] The primary transfer rollers 245Y, 245M, 245C, and 245K sequentially transfer (primary transfer) the toner images of each color formed on the photosensitive drums 241Y, 241M, 241C, and 241K, respectively, onto the intermediate transfer belt 246. That is, the primary transfer rollers 245Y, 245M, 245C, and 245K form a color toner image on the intermediate transfer belt 246 in which the toner images of four colors are superimposed. The secondary transfer roller 247 transfers the color toner image on the intermediate transfer belt 246 all at once onto one side of the paper P supplied from the supply tray (secondary transfer). The fixing unit 248 fixes the toner image onto the paper P by applying heat and pressure to the paper P by passing the paper P through a fixing nip formed by a fixing roller and a pressure roller.

[0042] The transport section 250 has a predetermined transport path for transporting the paper P, and includes a plurality of transport rollers 251, a reversing path 252, a registration section 253, and the like, which are provided along the transport path. The transport section 250 drives the transport rollers 251 to transport the paper P along the predetermined transport path within the image forming apparatus 200. The transport section 250 outputs the paper P to the post-processing apparatus 300 after the image formation. In the case of single-sided printing in which an image is formed on one side of the paper P in the image forming apparatus 200, the conveying unit 250 conveys the paper P from the fixing unit 248 to the post-processing device 300 under the control of the control unit 210. On the other hand, in the case of double-sided printing in which images are formed on both sides of the paper P, the conveying unit 250 conveys the paper P from the fixing unit 248 to the reversing path 252 and reverses the paper surface under the control of the control unit 210. Next, the conveying unit 250 feeds the paper P again upstream of the registration unit 253 in the conveying direction. The registration unit 253 includes a registration roller and transports the paper P to the transfer nip between the secondary transfer roller 247 and the intermediate transfer belt 246. The registration unit 253 corrects the inclination of the paper P transported on the transport path and adjusts the transport timing of the paper P.

[0043] A plurality of paper detection sensors 260 are provided at predetermined intervals on the transport path of the paper P. Specifically, as shown in FIG. 1 , a total of nine paper detection sensors 260 are provided on the upstream side of the registration unit 253, between the registration unit 253 and the secondary transfer roller 247, on the downstream side of the fixing unit 248, and on the reversing path 252. The paper detection sensor 260 detects the passing timing of each of the multiple sheets of paper P transported on the transport path. For example, the paper detection sensor 260 detects the passing timing of the leading edge and trailing edge of the paper P in the transport direction of the paper P. The paper detection sensor 260 outputs the detection result to the control unit 210. FIG. 3A shows an example of the detection signal of one paper detection sensor 260. FIG. 3B shows the time when the leading edge or trailing edge of a sheet of paper is detected by the paper detection sensor 260. In the example shown in FIGS. 3A and 3B, time t1 is the time when the paper detection sensor 260 detects the leading edge of the first sheet of paper. Time t2 is the time when the paper detection sensor 260 detects the trailing edge of the first sheet of paper. Time t3 is the time when the paper detection sensor 260 detects the leading edge of the second sheet of paper. Time t4 is the time when the paper detection sensor 260 detects the trailing edge of the second sheet of paper. Time t5 is the time when the paper detection sensor 260 detects the leading edge of the third sheet of paper. Time t6 is the time when the paper detection sensor 260 detects the trailing edge of the third sheet of paper. Time t7 is the time when the paper detection sensor 260 detects the leading edge of the fourth sheet of paper. Time t8 is the time when the paper detection sensor 260 detects the trailing edge of the fourth sheet of paper. Time t9 is the time when the paper detection sensor 260 detects the leading edge of the fifth sheet of paper.

[0044] The storage unit 270 is a large-capacity auxiliary storage device that stores various programs including an operating system, various data, etc. The storage of the storage unit 270 is, for example, a hard disk, a solid state drive, a flash memory, a ROM, etc. The storage unit 270 stores a state space model, which will be described later.

[0045] The communication unit 280 transmits and receives various information required for various setting values ​​and operation timing control to and from other devices.

[0046] <1-4. Configuration of post-processing device> Post-processing device 300 is connected to the rear stage of image forming device 200. Post-processing device 300 includes, for example, multiple post-processing units, and performs predetermined post-processing in the post-processing units specified by a job on paper P on which an image has been formed in image forming device 200. For example, post-processing device 300 includes post-processing units that perform processes such as perforation, folding, foil stamping, binding, cutting, stapling, gluing, and binding. As shown in FIG. 1, the post-processing device 300 includes a conveying section 350. The conveying section 350 conveys the paper P that has been subjected to image formation processing and that has been conveyed from the image forming apparatus 200 to a post-processing unit (not shown). The conveying section 350 discharges the post-processed paper P onto a paper discharge tray 352 by a discharge section 351 provided along the conveying path.

[0047] <2. State space model> Next, a description will be given of the state space model stored in storage unit 270 of image forming apparatus 200. Before image forming apparatus 200 is put into operation, control unit 210 of image forming apparatus 200 executes the following process to store the state space model in storage unit 270. Specifically, the control unit 210 causes the conveying unit 250 to convey a plurality of sheets of paper P, and obtains the detection results of the plurality of sheets of paper P from the plurality of sheet detection sensors 260. 4 shows an example of the detection results of multiple sheets of paper P by multiple sheet detection sensors 260. In the example shown in Fig. 4, the detection result of the sheet P is the time when the sheet detection sensor 260 detects the leading edge of the sheet P. The detection result of the sheet P may also be the time when the sheet detection sensor 260 detects the trailing edge of the sheet P. Control unit 210 generates a data set by chronologically arranging the detection results of multiple sheets of paper P for each sheet detection sensor 260. It is possible to calculate a change in the transport speed of sheet P based on the timing of passage of sheet P detected by multiple sheet detection sensors 260 and the positions of multiple sheet detection sensors 260. Therefore, a data set in which the detection results of multiple sheets of paper P for each sheet detection sensor 260 are arranged in chronological order is a data set corresponding to a change in the transport speed of sheet P in image forming apparatus 200.

[0048] When the image forming apparatus 200 is in a normal state, the control unit 210 acquires detection results of multiple sheets of paper P from multiple sheet detection sensors 260. Next, the control unit 210 executes an identification calculation by substituting a data set (normal data set) generated based on the detection results in the normal state into a state space model. The state space model is given by equation (1) representing a state equation and equation (2) representing an observation equation. x t+1 =Ax t +Bu t +Ke t ...Formula (1) y t =Cx t +Du t +e t ...Formula (2) In the above formula, x t is the state matrix, and y t is the output vector, and u t is the input vector, A, B, K, C, D are the coefficient matrices, and e t is the error term. That is, the control unit 210 calculates the above A, B, K, C, and D (coefficient matrix) in the state space model using the normal data set. The state space model using the calculated coefficient matrix is ​​set as a normal model, which is a state space model in the normal state of the image forming apparatus 200. The control unit 210 stores the normal model in the storage unit 270.

[0049] Alternatively, the control unit 210 may store the normal model acquired from an external device via the communication unit 280 in the storage unit 270. In this case, the external device calculates a coefficient matrix of the state space model using the normal data set acquired from the image forming apparatus 200. Next, the external device stores the state space model using the calculated coefficient matrix as the normal model in its own storage unit.

[0050] <3. Operation of the image forming system> Next, a description will be given of the operation of the image forming system 10 according to this embodiment. The control unit 210 of the image forming apparatus 200 executes a transport state determination process shown in FIG.

[0051] (Transportation status determination process) Control unit 210 causes paper feed device 100 to feed multiple sheets of paper P. Next, control unit 210 causes paper information detection device 400 to transport the multiple sheets of paper P on a transport path within image forming device 200, and acquires detection results of the multiple sheets of paper P from multiple paper detection sensors 260 (step A1). Next, the control unit 210 generates actual state information, which is a data set in which the detection results of the multiple sheets of paper P acquired in step A1 are arranged in chronological order for each sheet detection sensor 260 (step A2). That is, the actual state information includes a data set corresponding to the speed change of the paper in accordance with the timing of the paper passing through a plurality of sections on the transport path inside the image forming apparatus 200. A section on the transport path inside the image forming apparatus 200 is a section from the position where a predetermined paper detection sensor 260 is installed to the position where the next paper detection sensor 260 is installed in the transport direction. The actual state information includes a data set corresponding to the speed change of a plurality of sheets of paper in accordance with the timing of the sheets passing through the transport path in the image forming apparatus 200 .

[0052] In other words, the control unit 210 acquires actual state information corresponding to speed changes of the paper P on the transport path based on the detection results of the multiple paper detection sensors 260 arranged on the transport path of the paper P. The control unit 210 functions as a first acquisition unit. The control unit 210 acquires the detection results of the multiple paper detection sensors 260 corresponding to speed changes of the paper P on the transport path in real time.

[0053] Next, the control unit 210 substitutes the actual state information generated in step A2 into the normal model stored in the storage unit 270 to acquire an estimated value based on the normal model (step A3). The estimated value based on the normal model is reference state information (normal reference state information) in the normal state of the image forming apparatus 200. In other words, the control unit 210 acquires reference state information for comparison with the actual state information. The control unit 210 functions as a second acquisition unit. The reference state information includes a data set corresponding to a change in the speed of a sheet on a conveying path within the image forming apparatus 200 when the conveying apparatus (image forming apparatus 200) is in a normal state. The reference state information includes a set of data corresponding to the speed change of the sheet in accordance with the timing at which the sheet passes through a plurality of sections in the transport path within the image forming apparatus 200 . The reference state information includes a set of data corresponding to the speed change of a plurality of sheets of paper in accordance with the timing of their passage along the transport path within the image forming apparatus 200 .

[0054] Next, the control unit 210 calculates a normal conformance rate, which is the conformance rate between the actual state information generated in step A2 and the estimated value (normal reference state information) by the normal model acquired in step A3 (step A4). In step A4, the control unit 210 calculates the normal conformance rate, which is fit, by taking the interval correlation between the actual state information, which is u, and the estimated value by the normal model, which is y, using equation (3).

number

[0055] Next, the control unit 210 determines whether the normal matching rate calculated in step A4 is greater than a predetermined threshold (for example, 50%) (step A5). If the normal matching rate is greater than the predetermined threshold (step A5; YES), the control unit 210 determines that the conveyance state of the paper P by the conveyance unit 250 is normal (step A6). On the other hand, if the normal matching rate is equal to or less than the predetermined threshold (step A5; NO), the control unit 210 determines that the state of conveyance of the paper P by the conveyance unit 250 is abnormal (step A7). After executing step A6 or step A7, the control unit 210 displays the judgment result and / or normal conformance rate in step A6 or step A7 on the display unit of the operation display unit 220 (step A8). That is, the control unit 210 compares the actual state information with the reference state information to output evaluation information for evaluating the state of the conveying device (image forming device 200) that conveys paper through the conveying path. The control unit 210 functions as an output unit. The evaluation information in this embodiment is information corresponding to whether the conveying device is normal or abnormal. In step A8, the control unit 210 notifies the user of the evaluation information by displaying it on the display unit of the operation display unit 220. The control unit 210 functions as a notification unit. Next, the control unit 210 ends the transport state determination process.

[0056] <4. Modifications> <4-1. Variation 1> Next, a description will be given of Modification 1 of the present invention. In Modification 1, the same components as those in the above embodiment are given the same reference numerals, and the description thereof will be omitted.

[0057] The state space model stored in the storage unit 270 of Modification 1 includes an abnormality model. Before the image forming apparatus 200 is put into operation, the control unit 210 of the image forming apparatus 200 executes the following process to store the abnormality model in the storage unit 270. Specifically, when image forming apparatus 200 is in a predetermined abnormal state, control unit 210 causes conveyance unit 250 to convey multiple sheets of paper P and acquires detection results of the multiple sheets of paper P from multiple sheet detection sensors 260. Control unit 210 arranges the detection results of the multiple sheets of paper P for each sheet detection sensor 260 in chronological order to generate a data set in the abnormal state (an abnormal data set). Control unit 210 calculates a coefficient matrix of a state space model using the abnormal data set. Next, control unit 210 stores a state space model using the calculated coefficient matrix in storage unit 270 as an abnormal model.

[0058] Next, the transport state determination process of the first modified example shown in FIG. 6 will be described.

[0059] (Transportation state determination process of modified example 1) The control unit 210 executes steps B1 to B4 similar to steps A1 to A4 of the transport state determination process of the above embodiment. Next, the control unit 210 acquires an estimated value by the abnormality model by substituting the actual state information generated in step B2 into the abnormality model stored in the storage unit 270 (step B5). The estimated value by the abnormality model is reference state information (abnormal reference state information) for the abnormal state of the image forming apparatus 200. The reference state information includes a data set corresponding to a change in the speed of the paper on the conveying path in the image forming apparatus 200 when the conveying apparatus (image forming apparatus 200) is in a predetermined abnormal state.

[0060] Next, the control unit 210 calculates the abnormality matching rate, which is the matching rate between the actual state information generated in step B2 and the estimated value (abnormal reference state information) by the abnormality model acquired in step B5 (step B6). In step B6, the control unit 210 calculates the abnormality matching rate, which is fit, by taking the interval correlation between the actual state information, which is u, and the estimated value by the abnormality model, which is y, using the above formula (3). Next, the control unit 210 displays the normal matching rate calculated in step B4 and / or the abnormal matching rate calculated in step B6 on the display unit of the operation display unit 220 (step B7), and ends the transport state determination process. That is, the control unit 210 outputs, as evaluation information, the conformance rate (normal conformance rate) between the actual state information and reference state information (normal reference state information) in a normal state of the conveying device (image forming device 200). Alternatively, the control unit 210 outputs, as evaluation information, the conformance rate (abnormal conformance rate) between the actual state information and reference state information (abnormal reference state information) in a predetermined abnormal state of the conveying device (image forming device 200).

[0061] <4-2. Variation 2> Next, a description will be given of Modification 2 of the present invention. In Modification 2, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0062] Next, the transport state determination process of the second modified example shown in FIG. 7 will be described.

[0063] (Transportation state determination process of modified example 2) Control unit 210 causes paper feed device 100 to feed a predetermined number of sheets (e.g., 100 sheets) of paper P. Next, control unit 210 causes the predetermined number of sheets of paper P to be transported on a transport path within image forming apparatus 200, and acquires detection results of the predetermined number of sheets of paper P (1st to 100th sheets) by multiple paper detection sensors 260 (step C1). Next, the control unit 210 generates actual state information for the 1st to 100th sheets of paper P based on the detection results of the 1st to 100th sheets of paper P obtained in step A1 by the plurality of paper detection sensors 260 (step C2). Next, the control unit 210 substitutes the actual state information of the 1st to 100th sheets of paper P generated in step C2 into the normal model stored in the memory unit 270 to obtain an estimated value (normal reference state information) by the normal model (step C3). Next, the control unit 210 calculates a normal matching rate, which is the matching rate between the actual state information of the 1st to 100th sheets of paper P generated in step C2 and the normal reference state information corresponding to the 1st to 100th sheets of paper P obtained in step C3 (step C4).

[0064] Next, control unit 210 causes sheet feeding device 100 to feed a predetermined number of sheets (e.g., 100 sheets) of paper P. Next, control unit 210 causes the predetermined number of sheets of paper P to be transported on the transport path within image forming device 200, and obtains the detection results of the predetermined number of sheets of paper P (101st to 200th sheets) by multiple sheet detection sensors 260 (step C5). Next, control unit 210 generates actual state information for the 101st to 200th sheets of paper P based on the detection results of the 101st to 200th sheets of paper P obtained in step C5 by the plurality of paper detection sensors 260 (step C6). Next, the control unit 210 substitutes the actual state information of the 101st to 200th sheets of paper P generated in step C6 into the normal model stored in the memory unit 270 to obtain an estimated value (normal reference state information) by the normal model (step C7). Next, the control unit 210 calculates a normal matching rate, which is the matching rate between the actual state information of the 101st to 200th sheets of paper P generated in step C6 and the normal reference state information corresponding to the 101st to 200th sheets of paper P obtained in step C7 (step C8).

[0065] Next, the control unit 210 displays the normal matching rates corresponding to the 1st to 100th sheets of paper P calculated in step C4 and the normal matching rates corresponding to the 101st to 200th sheets of paper P calculated in step C8 on the display unit of the operation display unit 220 (step S9). As a result, the control unit 210 displays information indicating changes in the normal matching rates. Next, the control unit 210 ends the transport state determination process.

[0066] In the conveyance state determination process of Modified Example 2, the control unit 210 may execute the following process. Specifically, the control unit 210 substitutes the actual state information of the 1st to 100th sheets of paper P into the abnormality model stored in the storage unit 270 to obtain an estimated value by the abnormality model (abnormal reference state information). Next, the control unit 210 calculates an abnormality matching rate, which is the matching rate between the actual state information of the 1st to 100th sheets of paper P and the abnormal reference state information corresponding to the 1st to 100th sheets of paper P. Next, the control unit 210 substitutes the actual state information of the 101st to 200th sheets of paper P into the abnormality model to obtain an estimated value by the abnormality model (abnormal reference state information). Next, the control unit 210 calculates an abnormality matching rate, which is the matching rate between the actual state information of the 101st to 200th sheets of paper P and the abnormal reference state information corresponding to the 101st to 200th sheets of paper P. Next, the control unit 210 displays the abnormal conformance rates corresponding to the 1st to 100th sheets of paper P and the abnormal conformance rates corresponding to the 101st to 200th sheets of paper P on the display unit of the operation display unit 220. In this way, the control unit 210 displays information indicating changes in the abnormal conformance rates. That is, the control unit 210 outputs, as evaluation information, information indicating a change in the conformance rate (normal conformance rate) between the actual state information and the reference state information (normal reference state information) in a normal state of the conveying device (image forming device 200). Alternatively, the control unit 210 outputs, as evaluation information, information indicating a change in the conformance rate (abnormal conformance rate) between the actual state information and the reference state information (abnormal reference state information) in a predetermined abnormal state of the conveying device.

[0067] <4-3. Variation 3> Next, a description will be given of Modification 3 of the present invention. In Modification 3, the same components as those in the above embodiment are given the same reference numerals, and the description thereof will be omitted.

[0068] The state space model stored in storage unit 270 of Modification 3 includes abnormality models corresponding to multiple types of abnormal states. Before image forming apparatus 200 is put into operation, control unit 210 of image forming apparatus 200 executes the following process to store multiple types of abnormality models in storage unit 270. Specifically, when roller A of transport rollers 251 is deteriorated, control unit 210 transports multiple sheets of paper P using transport unit 250 and acquires detection results of the multiple sheets of paper P from multiple sheet detection sensors 260. A jam that occurs during transport of sheets of paper P due to deterioration of roller A is designated as jam A. Control unit 210 arranges the detection results of the multiple sheets of paper P for each sheet detection sensor 260 in chronological order to generate a data set (jam A data set) for an abnormal state in which jam A is likely to occur. Next, control unit 210 calculates a coefficient matrix of a state space model using the jam A data set. Next, control unit 210 stores a state space model using the calculated coefficient matrix in storage unit 270 as a jam A model.

[0069] Furthermore, in an abnormal state in the speed of the motor that drives the transport roller 251, the control unit 210 transports multiple sheets of paper P using the transport unit 250 and acquires detection results of the multiple sheets of paper P from the multiple sheet detection sensors 260. A jam that occurs during the transport of the sheets of paper P due to an abnormality in the speed of the motor that drives the transport roller 251 is designated as jam B. The control unit 210 arranges the detection results of the multiple sheets of paper P for each sheet detection sensor 260 in chronological order to generate a data set (jam B data set) in an abnormal state in which jam B is likely to occur. Next, the control unit 210 calculates a coefficient matrix of a state space model using the jam B data set. Next, the control unit 210 stores the state space model using the calculated coefficient matrix in the storage unit 270 as a jam B model.

[0070] Furthermore, in a state where the temperature inside image forming apparatus 200 has abnormally risen, control unit 210 conveys multiple sheets of paper P using conveying unit 250 and acquires detection results of the multiple sheets of paper P from multiple sheet detection sensors 260. A jam that occurs during the conveyance of sheets of paper P due to the abnormal rise in temperature inside image forming apparatus 200 is designated as jam C. Control unit 210 arranges the detection results of the multiple sheets of paper P for each sheet detection sensor 260 in chronological order to generate a data set (jam C data set) in an abnormal state where jam C is likely to occur. Next, control unit 210 calculates a coefficient matrix of a state space model using the jam C data set. Next, control unit 210 stores a state space model using the calculated coefficient matrix in storage unit 270 as a jam C model.

[0071] Next, the transport state determination process of the third modified example shown in FIG. 8 will be described.

[0072] (Transportation state determination process of modified example 3) The control unit 210 executes steps D1 to D4 similar to steps A1 to A4 of the transport state determination process of the above embodiment. Next, the control unit 210 substitutes the actual state information generated in step D2 into any of the abnormality models stored in the storage unit 270 to obtain an estimated value (abnormal reference state information) based on the abnormality model (step D5). The estimated value by the jam A model is reference state information corresponding to the deterioration state of roller A of the transport rollers 251. The estimated value by the jam B model is reference state information corresponding to the speed abnormality state of the motor that drives the conveyance roller 251. The estimated value by the jam C model is reference state information corresponding to the trend of the transport time of the paper P when the diameter of the transport roller 251 expands abnormally due to an abnormal rise in temperature inside the image forming apparatus 200.

[0073] Next, the control unit 210 calculates an abnormality conformance rate, which is the conformance rate between the actual state information generated in step D2 and the estimated value by the abnormality model (abnormal reference state information) acquired in step D5 (step D6). The conformance rate between the actual state information and the estimated value by the jam A model is set to the abnormality conformance rate of jam A. The conformance rate between the actual state information and the estimated value by the jam B model is set to the abnormality conformance rate of jam B. The conformance rate between the actual state information and the estimated value by the jam C model is set to the abnormality conformance rate of jam C. Next, the control unit 210 determines whether or not all types of abnormal matching rates have been calculated (step D7). If there is an abnormal conformance rate that has not been calculated (step D7; NO), the control unit 210 shifts the transport state determination process to step D5.

[0074] On the other hand, if all types of abnormal matching rates have been calculated (step D7; YES), the control unit 210 determines whether the normal matching rate calculated in step D4 is greater than all types of abnormal matching rates (step D8). If the normal conformance rate is greater than all types of abnormal conformance rates (step D8; YES), the control unit 210 determines that the conveyance state of the paper P by the conveyance unit 250 is normal (step D9). Next, the control unit 210 displays the determination result in step D9, the normal matching rate, and all types of abnormal matching rates on the display unit of the operation display unit 220 (step D10), and ends the transport state determination process.

[0075] On the other hand, if the normal matching rate is equal to or lower than either of the abnormal matching rates (step D8; NO), the control unit 210 determines whether the abnormal matching rate of jam A is higher than the abnormal matching rates of other types (the abnormal matching rate of jam B and the abnormal matching rate of jam C) (step D11). If the abnormal conformance rate for jam A is higher than the abnormal conformance rates for other types (step D11; YES), control unit 210 determines that the state of conveyance of sheet P by conveyance unit 250 is an abnormal state in which jam A is likely to occur (step D12). Next, the control unit 210 displays the determination result in step D12, the normal matching rate, all types of abnormal matching rates, and the abnormality factors on the display unit of the operation display unit 220 (step D13), and ends the transport state determination process.

[0076] FIG. 9 shows an example of a display screen 221 that the control unit 210 displays on the display unit of the operation display unit 220 in step D13. In the example shown in FIG. 9, the control unit 210 displays on the display screen 221 a normal matching rate 221a, an abnormal matching rate 221b for all types, a determination result 221c in step D12, and a cause of jam A 221d.

[0077] On the other hand, if the abnormal conformance rate of jam A is equal to or lower than any of the other abnormal conformance rates (step D11; NO), the control unit 210 determines whether the abnormal conformance rate of jam B is higher than the abnormal conformance rate of jam C (step D14). If the abnormal matching rate of jam B is greater than the abnormal matching rate of jam C (step D14; YES), control unit 210 determines that the state of conveyance of sheet P by conveyance unit 250 is an abnormal state in which jam B is likely to occur (step D15). Next, the control unit 210 transitions the transport status determination process to step D13, and displays the determination results in step D15, the normal matching rate, all types of abnormal matching rates, and the abnormality factors on the display unit of the operation display unit 220, and ends the transport status determination process.

[0078] On the other hand, if the abnormal conformance rate of jam B is equal to or lower than the abnormal conformance rate of jam C (step D14; NO), control unit 210 determines that the state of conveyance of sheet P by conveyance unit 250 is an abnormal state in which jam C is likely to occur (step D16). Next, the control unit 210 transitions the transport status determination process to step D13, and displays the determination results in step D16, the normal matching rate, all types of abnormal matching rates, and the abnormality factors on the display unit of the operation display unit 220, and ends the transport status determination process. In other words, the control unit 210 outputs, as evaluation information, the conformance rate (abnormal conformance rate) between the actual state information for each type of abnormal state of the conveying device (image forming device 200) and the reference state information (abnormal reference state information) for the abnormal state of the conveying device.

[0079] <4-4. Variation 4> Next, a description will be given of Modification 4 of the present invention. In Modification 4, the same components as those in the above embodiment are given the same reference numerals, and the description thereof will be omitted.

[0080] The storage unit 270 of the fourth modification stores a correction coefficient table T1. As shown in Fig. 10 , the correction coefficient table T1 stores correction coefficients for correcting the detection results of the paper detection sensor 260 for each type of paper characteristic information of the paper P detected by the media sensor 430 and for each paper detection sensor 260.

[0081] Next, the transport state determination process of the fourth modification shown in FIG. 11 will be described.

[0082] (Transportation state determination process of modified example 4) The control unit 210 causes the paper feeder 100 to feed a plurality of sheets of paper P. Next, the control unit 210 acquires paper characteristic information, which is the detection result of any one of the sheets of paper P by the media sensor 430 of the paper information detection device 400 (step E1). In step E1, the control unit 210 acquires the size, paper thickness, basis weight, moisture content, stiffness, surface properties, and stiffness of the paper P as the paper characteristic information. Next, the control unit 210 causes the plurality of sheets P to be transported on a transport path within the image forming apparatus 200, and acquires the detection results of the plurality of sheets P by the plurality of sheet detection sensors 260 (step E2). Next, the control unit 210 generates actual state information based on the detection results of the plurality of sheets P by the plurality of sheet detection sensors 260 acquired in step E2 (step E3).

[0083] Next, the control unit 210 determines whether or not the sheet characteristic information of the sheet P acquired in step E1 is greater than a predetermined reference value (step E4). If the paper characteristic information of the paper P is greater than the predetermined reference value (step E4; YES), the control unit 210 corrects the actual state information generated in step E3 using the correction coefficient stored in the correction coefficient table T1 (step E5). In the example shown in FIG. 10, for example, if the moisture content of the paper P is higher than the predetermined reference value, the control unit 210 corrects the actual state information by executing the following process. Specifically, the control unit 210 multiplies the detection result of the first paper detection sensor 260 by a correction coefficient of 0.9. Furthermore, the control unit 210 multiplies the detection result of the second paper detection sensor 260 by a correction coefficient of 0.2. Furthermore, the control unit 210 multiplies the detection result of the third paper detection sensor 260 by a correction coefficient of 0.5. Furthermore, the control unit 210 multiplies the detection result of the fourth paper detection sensor 260 by a correction coefficient of 1.2. Furthermore, the control unit 210 multiplies the detection result of the fifth paper detection sensor 260 by a correction coefficient of "0.8."

[0084] Next, the control unit 210 substitutes the actual state information corrected in step E5 into the normal model stored in the storage unit 270 to obtain an estimated value (normal reference state information) based on the normal model (step E6). Next, the control unit 210 calculates a normal matching rate, which is a matching rate between the actual state information corrected in step E5 and the normal reference state information acquired in step E6 (step E7).

[0085] On the other hand, if the paper characteristic information of the paper P is below a predetermined reference value (step E4; NO), the control unit 210 substitutes the actual state information generated in step E3 into the normal model stored in the memory unit 270 to obtain an estimated value (normal reference state information) based on the normal model (step E8). Next, the control unit 210 calculates a normal matching rate, which is the matching rate between the actual state information generated in step E3 and the normal reference state information acquired in step E8 (step E9).

[0086] After executing step E7 or step E9, the control unit 210 executes steps E10 to E13, which are similar to steps A5 to A8 of the transport state determination process of the above embodiment, and ends the transport state determination process.

[0087] In step E6 of the transport state determination process of the above-described modified example 4, the control unit 210 may acquire an estimated value by the normal model by substituting the uncorrected actual state information generated in step E3 into the normal model. In this case, in step E7, the control unit 210 calculates a normal matching rate, which is the matching rate between the actual state information corrected in step E5 and the estimated value by the normal model based on the uncorrected actual state information.

[0088] Alternatively, in step E7 of the transport status determination process of the above-mentioned variant example 4, the control unit 210 may calculate a normal matching rate, which is the matching rate between the actual status information generated in step E3 without correction and the estimated value by the normal model based on the corrected actual status information.

[0089] <5. Effects> As described above, the transport state determination system (image forming system 10) according to this embodiment includes a first acquisition unit (control unit 210) that acquires actual state information corresponding to changes in the speed of the paper on the transport path based on the detection results of multiple paper detection sensors 260 arranged on the paper transport path. The transport state determination system according to this embodiment includes a second acquisition unit (control unit 210) that acquires reference state information to be compared with actual state information. The transport state determination system according to this embodiment includes an output unit (control unit 210) that outputs evaluation information for evaluating the state of a transport device (image forming device 200) that transports paper along a transport path by comparing actual state information with reference state information. Therefore, before a jam occurs during the transport of paper P, the evaluation information of the state of the transport device can be obtained, and the jam can be prevented in advance based on the evaluation information. This makes it possible to reduce paper waste and reduced productivity.

[0090] In the conveyance state determination system (image forming system 10) according to this embodiment, the evaluation information is information corresponding to whether the conveyance device (image forming device 200) is normal or abnormal. Therefore, before a jam occurs during the transport of the paper P, it is possible to know whether the transport device is in a normal state or an abnormal state, and therefore it is possible to prevent a jam in advance.

[0091] In the conveying state determination system (image forming system 10) according to this embodiment, the evaluation information is the conformance rate between the actual state information and the reference state information in the normal state of the conveying device (image forming device 200), or the conformance rate between the actual state information and the reference state information in a specified abnormal state of the conveying device. Therefore, it is possible to know the conformance rate between the current state of the conveying device and the normal state, or the conformance rate between the current state and the abnormal state, before a jam occurs in the conveying of paper P. This makes it possible to prevent a jam beforehand.

[0092] In the conveying state determination system (image forming system 10) according to this embodiment, the evaluation information is information indicating a change in the conformance rate between the actual state information and the reference state information in the normal state of the conveying device (image forming device 200), or information indicating a change in the conformance rate between the actual state information and the reference state information in a specified abnormal state of the conveying device. Therefore, before a jam occurs in the transport of paper P, it is possible to grasp the change in the compatibility rate between the current state of the transport device and the normal state, or the change in the compatibility rate between the current state and the abnormal state, thereby making it possible to prevent a jam in advance.

[0093] In the conveyance state determination system (image forming system 10) according to this embodiment, the reference state information includes a data set corresponding to a change in the speed of the paper on the conveyance path in the normal state of the conveyance device (image forming device 200). Therefore, before a jam occurs in the transport of paper P, it is possible to grasp the results of a comparison between the current speed change of paper and the speed change of paper when the transport device is in a normal state, thereby making it possible to prevent a jam beforehand.

[0094] In the conveying state determination system (image forming system 10) according to this embodiment, the reference state information includes a data set corresponding to the speed change of the paper on the conveying path when the conveying device (image forming device 200) is in a normal state, and a data set corresponding to the speed change of the paper on the conveying path when the conveying device is in a specified abnormal state. Therefore, before a jam occurs in the transport of paper P, it is possible to grasp the results of a comparison between the current speed change of the paper and the speed change of the paper when the transport device is in a normal state. It is also possible to grasp the results of a comparison between the current speed change of the paper and the speed change of the paper when the transport device is in a specified abnormal state. This makes it possible to prevent jams in advance.

[0095] In the transport state determination system (image forming system 10) according to this embodiment, the actual state information and the reference state information include a data set corresponding to the speed change of the sheet depending on the timing at which the sheet passes through a plurality of sections on the transport path. Therefore, data corresponding to the transport state of the paper on the transport path can be easily obtained.

[0096] In the transport state determination system (image forming system 10) according to this embodiment, the actual state information and the reference state information include a data set corresponding to the speed change of a plurality of sheets in accordance with the passing timing of the sheets on the transport path. Therefore, data corresponding to the transport state of the paper on the transport path can be easily obtained.

[0097] In the transport state determination system (image forming system 10) according to this embodiment, the reference state information includes an estimated value based on a state space model. Therefore, reference state information for comparison with actual state information can be easily obtained.

[0098] In the conveyance state determination system (image forming system 10) according to this embodiment, at least one of the actual state information and the reference state information includes a data set corrected based on paper characteristic information indicating the characteristics of the paper. Therefore, it is possible to obtain more accurate evaluation information on the state of the conveying device according to the characteristics of the paper.

[0099] In the transport state determination system (image forming system 10) according to this embodiment, the paper characteristic information is information corresponding to the characteristics of the paper detected by the media sensor. Therefore, the paper characteristic information can be easily obtained.

[0100] The transport state determination system (image forming system 10) according to this embodiment includes a notification unit (control unit 210) that notifies the user of evaluation information. Therefore, the user can grasp the evaluation information of the state of the conveying device before a jam occurs during the conveyance of the paper P, and can prevent the jam in advance based on the evaluation information.

[0101] In the conveyance state determination system (image forming system 10) according to this embodiment, the evaluation information is the conformance rate between the actual state information for each type of abnormal state of the conveyance device and the reference state information in the abnormal state of the conveyance device. Therefore, before a jam occurs during the transport of the paper P, the type of abnormal state with a relatively high conformance rate can be grasped, making it easier to prevent a jam beforehand.

[0102] In the transport state determination system (image forming system 10) according to this embodiment, the first acquisition unit (control unit 210) acquires in real time the detection results of a plurality of sheet detection sensors corresponding to changes in the speed of the sheet on the transport path. Therefore, data corresponding to the current transport state of the paper on the transport path can be easily obtained.

[0103] Although the present invention has been specifically described above based on the embodiments thereof, the present invention is not limited to the above embodiments and can be modified within the scope of the present invention. For example, in the above embodiment, the control unit 210 acquires the physical property values ​​detected by the media sensor 430 as paper characteristic information, but this is not limited to this. The control unit 210 may acquire the physical property values ​​based on paper information set by the user via the operation display unit 220. In other words, the control unit 210 acquires the physical property values ​​of the paper P as paper characteristic information based on paper information such as the paper type, basis weight, and size of the paper P.

[0104] In addition, in the above embodiment, the control unit 210 functions as a "first acquisition unit," a "second acquisition unit," an "output unit," and a "notification unit," but this is not limited to this. The image forming system 10 may include an external device connected for communication with the image forming apparatus 200, and the external device may function as the "first acquisition unit," the "second acquisition unit," the "output unit," and the "notification unit."

[0105] In addition, the detailed configuration and operation of each device constituting the image forming system can be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0106] 10. Image forming system 100 Paper feeder 110 Conveying section 120 Paper supply unit 400 Paper information detection device 410 Control Unit 420 Conveyor 421,422 Transport route 430 Media Sensor 431 Size Sensor 432 Paper thickness sensor 433 Basis weight sensor 434 Moisture Sensor 435 Stiffness Sensor 436 Surface Sensor 437 Resistive Sensor 440 Purge Tray 200 Image forming device 210 control unit (first acquisition unit, second acquisition unit, output unit, notification unit) 220 Operation display section 230 Scanner 240 Image forming unit 241Y, 241M, 241C, 241K Photoconductor Drum 242Y, 242M, 242C, 242K charging unit 243Y, 243M, 243C, 243K Exposure section 244Y, 244M, 244C, 244K developing section 245Y, 245M, 245C, 245K Primary transfer roller 246 Intermediate transfer belt 247 Secondary transfer roller 248 Fixing part 250 conveyor 251 Transport roller 252 Reverse Route 253 Resist Section 260 Paper detection sensor 270 Storage section 280 Communications Department 300 Aftertreatment device 350 Conveyor 351 Discharge section 352 Paper output tray P paper

Claims

1. a first acquisition unit that acquires actual state information corresponding to a change in speed of the paper on the paper transport path based on detection results of a plurality of paper detection sensors arranged on the paper transport path; a second acquisition unit that acquires reference state information to be compared with the actual state information; an output unit that compares the actual state information with the reference state information to output evaluation information for evaluating the state of a conveying device that conveys the paper through the conveying path; A transport status determination system comprising:

2. The transport state determination system according to claim 1 , wherein the evaluation information is information indicating whether the transport device is normal or abnormal.

3. The transport state determination system of claim 1, wherein the evaluation information is a conformance rate between the actual state information and the reference state information in a normal state of the transport device, or a conformance rate between the actual state information and the reference state information in a specified abnormal state of the transport device.

4. The transport state determination system of claim 1, wherein the evaluation information is information indicating a change in the conformance rate between the actual state information and the reference state information in a normal state of the transport device, or information indicating a change in the conformance rate between the actual state information and the reference state information in a specified abnormal state of the transport device.

5. The transport state determination system according to claim 1 , wherein the reference state information includes a data set corresponding to a change in speed of the paper on the transport path when the transport device is in a normal state.

6. The transport state determination system of claim 1, wherein the reference state information includes a data set corresponding to a change in the speed of paper on the transport path when the transport device is in a normal state, and a data set corresponding to a change in the speed of paper on the transport path when the transport device is in a specified abnormal state.

7. The transport state determination system according to claim 1 , wherein the actual state information and the reference state information include a data set corresponding to a change in speed of the sheet depending on the timing of passing the sheet through a plurality of sections on the transport path.

8. The transport state determination system according to claim 1 , wherein the actual state information and the reference state information include a data set corresponding to a change in speed of a plurality of sheets of paper in accordance with the timing of their passage along the transport path.

9. The transport state determination system according to claim 1 , wherein the reference state information includes an estimated value based on a state space model.

10. The transport state determination system according to claim 1 , wherein at least one of the actual state information and the reference state information includes a data set corrected based on paper characteristic information indicating characteristics of the paper.

11. The transport state determination system according to claim 10 , wherein the paper characteristic information is information corresponding to characteristics of the paper detected by a media sensor.

12. The transport state determination system according to claim 1 , further comprising a notification unit that notifies a user of the evaluation information.

13. The transport state determination system according to claim 1 , wherein the evaluation information is a conformance rate between the actual state information for each type of abnormal state of the transport device and the reference state information for the abnormal state of the transport device.

14. The transport state determination system according to claim 1 , wherein the first acquisition unit acquires in real time detection results of the plurality of paper detection sensors corresponding to changes in speed of the paper on the transport path.

15. The computer of the transport status determination system a first acquisition unit that acquires actual state information corresponding to a change in speed of the paper on the paper transport path based on detection results of a plurality of paper detection sensors arranged on the paper transport path; a second acquisition unit that acquires reference state information to be compared with the actual state information; an output unit that compares the actual state information with the reference state information to output evaluation information for evaluating the state of a conveying device that conveys the paper through the conveying path; A program to function as a

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