JP7749987B2 - Image forming apparatus and image forming method - Google Patents

Description

This disclosure relates to an image forming apparatus and an image forming method.

JP 2020-3514 A (Patent Document 1) discloses an image forming device that uses a media sensor to acquire characteristic values of the paper to be fed, determines based on the acquired values whether the paper to be fed is of the type set for the job, and stops the job if the paper to be fed is not of the type set for the job.

Japanese Patent Application Laid-Open No. 2020-3514

The image forming device described above can prevent paper wear caused by using the wrong type of paper. However, some types of paper wear are caused by the wrong type of paper, while other types of wear are caused by factors related to the image forming device (for example, certain settings on the image forming device). With the image forming device described above, when wear actually occurs, it is difficult for the user to understand the cause, and the work required to resolve the wear can be time-consuming.

This disclosure has been made in light of this current situation, and one of its objectives is to provide an image forming apparatus and image forming method that improves user work efficiency in eliminating waste.

An image forming device according to one aspect of the present disclosure includes an image forming unit that forms an image on paper transported along a transport path, a scanner that acquires an image of the paper by scanning the paper as it is transported along the transport path, a measurement unit that measures characteristic values of the paper as it is transported along the transport path, a first determination unit that determines whether the paper is worn out based on the image acquired by the scanner, and an instruction unit that, if the paper is determined to be worn out during execution of a print job, instructs an output device to output information including the measurement values measured by the measurement unit.

Preferably, the image forming device further includes an estimation unit that, when it is determined that the paper is worn out, estimates the cause of the wear from the measurement value. The information including the measurement value further includes the cause of the wear.

Preferably, the image forming device further includes a storage device that stores paper characteristic values for each type of paper. When the paper is determined to be worn, the estimation unit estimates the cause of the wear by comparing the measurement value with the characteristic value corresponding to the type specified by the print job.

Preferably, the characteristic values include a value indicating a first characteristic. The estimation unit sets the value indicating the first characteristic among the characteristic values corresponding to the type specified by the print job as a first threshold, and if the value indicating the first characteristic among the measured values exceeds the first threshold, estimates that the cause of the waste is the wrong type of paper.

Preferably, the value indicating the first characteristic includes at least one of smoothness, basis weight, and paper thickness.

Preferably, the estimation unit estimates that the cause of the waste is an issue related to the image forming device if the value indicating the first characteristic among the measured values does not exceed the first threshold value.

Preferably, the characteristic values further include a value indicating a second characteristic different from the first characteristic. The value indicating the second characteristic is moisture content. The image forming unit is a printer equipped with a fixing unit. The measurement unit is provided downstream of the fixing unit on the transport path. The estimation unit sets the value indicating the second characteristic among the characteristic values corresponding to the type specified by the print job as a second threshold, and if the value indicating the first characteristic among the measured values does not exceed the first threshold and the value indicating the second characteristic among the measured values exceeds the second threshold, estimates that the cause of the waste is the fixing temperature in the fixing unit, among factors related to the image forming device.

Preferably, the image forming device further includes a paper feed tray that includes the tray that contained the paper determined to be worn and at least one other tray excluding the tray. The storage device further stores characteristic values of the paper contained in the paper feed tray as set values for each tray. When it is estimated that the cause of the wear is the wrong type of paper, the image forming device further includes a second determination unit that determines whether there is at least one other tray that contains paper having characteristics corresponding to the type specified by the print job by using a characteristic value corresponding to the type specified by the print job as a third threshold and comparing the set value corresponding to at least one other tray with the third threshold. When it is determined that there is at least one other tray that contains paper having characteristics corresponding to the type specified by the print job, the information including the measurement value further includes a message prompting the user to feed paper from the other tray.

Preferably, the image forming device further includes a transmitter that transmits a signal to a measuring unit when the paper is determined to be worn. The measuring unit is located downstream of the scanner on the transport path, and measures characteristic values of the transported paper in response to receiving the signal.

Preferably, the transport path includes a first transport path leading to a first tray onto which paper not determined to be worn is discharged, and a second transport path leading to a second tray onto which paper determined to be worn is discharged. The measurement unit is provided on the second transport path and measures the characteristic values of the paper upon detecting the paper that has been transported.

Preferably, the image forming unit further forms a test image on the same paper as the above-mentioned paper or on another paper different from the above-mentioned paper. The first determination unit further determines whether or not a change has occurred in the density of the test image based on an image of the paper on which the test image has been formed, acquired by the scanner. If the paper is not determined to be worn, the instruction unit further instructs the output device to output a measurement value in response to a determination that a change has occurred in the density of the test image.

In another aspect of the present disclosure, an image forming method executed by a computer includes forming an image on paper transported along a transport path, acquiring an image of the paper by scanning the paper transported along the transport path, acquiring characteristic values of the paper transported along the transport path as measured values, determining whether the paper is worn based on the acquired image, and, if the paper is determined to be worn during execution of a print job, instructing an output device to output information including the acquired measured values.

This disclosure provides an image forming apparatus and image forming method that improves the user's work efficiency in eliminating waste.

1 is a diagram for explaining an overview of an image forming apparatus according to a first embodiment. 1 is a block diagram showing a main hardware configuration of an image forming apparatus according to a first embodiment. FIG. 2 illustrates an example of a print job. FIG. 2 is a block diagram showing an example of a module realized by a processor in the first embodiment. FIG. 10 is a diagram illustrating an example of a characteristic information table. FIG. 10 is a diagram illustrating an example of a tray information table. FIG. 4 is a diagram illustrating an example of processing executed by the image forming apparatus in the first embodiment. FIG. 10 is a diagram illustrating an example of a screen displayed on an operation panel. FIG. 10 is a diagram illustrating an example of a screen displayed on an operation panel. FIG. 10 is a diagram illustrating an example of a screen displayed on an operation panel. FIG. 10 is a diagram illustrating an example of a screen displayed on an operation panel. FIG. 11 is a block diagram showing an example of a module realized by a processor in the second embodiment. FIG. 11 is a diagram illustrating an example of processing executed by an image forming apparatus according to a second embodiment. FIG. 10 is a diagram illustrating an image forming apparatus according to a third embodiment. FIG. 11 is a diagram illustrating an example of processing executed by an image forming apparatus according to a third embodiment. FIG. 10 is a diagram showing an example of an inspection image. FIG. 13 is a diagram illustrating an example of processing executed by an image forming apparatus according to a fourth embodiment.

Embodiments of the present invention will now be described with reference to the drawings. In the following description, identical parts and components are designated by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions of these will not be repeated. Note that the embodiments and variations described below may be selectively combined as appropriate.

Furthermore, in the following, the term "user" will be used to refer to both those who perform maintenance on image forming devices (service personnel) and those who manage and/or use image forming devices (operators).

[First Embodiment]
(1. Overview of Image Forming Apparatus)
An overview of an image forming apparatus according to the first embodiment will be described with reference to FIG. 1 . FIG. 1 is a diagram for explaining the overview of the image forming apparatus according to the first embodiment. The image forming apparatus 1 is connected to a terminal device 500 via a network 99. The image forming apparatus 1 receives a print job including document data to be printed from the terminal device 500, and forms an image on paper based on the print job (hereinafter also referred to as "printing"). The terminal device 500 is configured by, for example, a PC (Personal Computer), a smartphone, a tablet, or the like. The network 99 may be, for example, a public network such as the Internet, a public line, or a public wireless LAN (Local Area Network), or a private network such as a LAN or a VPN (Virtual Private Network).

The image forming apparatus 1 comprises a transport path 150 along which paper is transported, a paper feed tray T, and a paper output tray 140. Paper is sent out one sheet at a time from the paper feed tray T to the transport path 150. The paper feed tray T includes multiple trays (trays T1 to T6 in this example). Each of the multiple trays holds multiple sheets of paper. The number of trays can be two or more. As the paper is transported along the transport path 150, an image is formed on the paper, and the paper with the image formed is output to the paper output tray 140 as a printed product. In the following description, the side on which the paper feed tray T is located will be referred to as the upstream side of the transport path 150, and the side on which the paper output tray 140 is located will be referred to as the downstream side of the transport path 150.

The image forming device 1 further includes a printer 104, a scanner 105, a measuring device 106, an operation panel 107, and a control device 100.

The printer 104 is an example of an "image forming unit." The printer 104 forms an image on paper transported along the transport path 150. The printer 104 includes four photoconductors 104A corresponding to cyan, magenta, yellow, and black. A charger, an exposure unit, a developer, and other devices are arranged around each of the four photoconductors 104A, which form an image of the corresponding color on each of the four photoconductors 104A. The printer 104 also includes an intermediate transfer belt 104B, a secondary transfer unit 104C, and a fixing unit 104D. The images formed on each of the four photoconductors 104A are transferred to the intermediate transfer belt 104B. The secondary transfer unit 104C transfers the image on the intermediate transfer belt 104B to paper transported along the transport path 150. The fixing unit 104D is located downstream of the secondary transfer unit 104C on the conveying path 150, and applies heat and pressure to the paper on which the image has been formed, fixing the image to the paper.

Scanner 105 is located downstream of printer 104. Scanner 105 acquires an image of a sheet of paper on which an image is formed by scanning the sheet of paper transported along transport path 150. As an example, scanner 105 includes image sensor 105A and image sensor 105B. Image sensor 105A and image sensor 105B are, for example, CMOS (Complementary Metal Oxide Semiconductor) sensors or CCD (Charge Coupled Device) sensors. Image sensor 105A acquires an image of a first side of the sheet of paper (e.g., the front side) by scanning the first side, and outputs the acquired image to control device 100. Image sensor 105B acquires an image of a second side of the sheet of paper (e.g., the back side) by scanning the second side, and outputs the acquired image to control device 100.

The measuring device 106 is an example of a "measuring unit." The measuring device 106 measures the characteristic values of paper transported along the transport path 150 and outputs the measured characteristic values to the control device 100 as measurement values. As an example, the measuring device 106 is an optical sensor that has an irradiation unit that irradiates light onto the paper and a light receiving unit that receives light reflected by the paper. The sensor detects the characteristic values of the paper from the transmittance, reflectance, etc. when light is irradiated onto the paper.

The characteristic values include a value indicating a first characteristic and a value indicating a second characteristic. The first characteristic is the smoothness of the paper surface, the weight of the paper, or the thickness of the paper. The value indicating the first characteristic is a value indicating the smoothness of the paper surface or a value indicating the weight or thickness of the paper, such as smoothness, basis weight, or paper thickness. The second characteristic is a characteristic different from the first characteristic, and is the amount of moisture contained in the paper. The value indicating the second characteristic is a value indicating the amount of moisture contained in the paper, such as moisture content. In this embodiment, the measuring device 106 measures smoothness, basis weight, and paper thickness as values indicating the first characteristic, and moisture content as a value indicating the second characteristic.

In the example shown in FIG. 1, the measuring device 106 is provided downstream of the fixing unit 104D and upstream of the scanner 105 on the conveying path 150, but the location of the measuring device 106 is not limited to this. As another example, the measuring device 106 may be provided downstream of the scanner 105 (for example, position P1 in the figure). Furthermore, the location at which the measuring device 106 is provided is not limited to one. As an example, one measuring device 106 may be provided near the paper feed tray T (for example, position P2 in the figure) and one downstream of the fixing unit 104D. In this case, the measuring device 106 provided near the paper feed tray T measures a value indicating the first characteristic, and the measuring device 106 provided downstream of the fixing unit 104D measures a value indicating the second characteristic.

Operation panel 107 is an example of an "output device." Operation panel 107 is composed of a display and a touch panel. The display and touch panel are stacked on top of each other, and operation panel 107 accepts operations for image forming device 1 by touch operation. Furthermore, operation panel 107 may include hard buttons that accept operations for image forming device 1. In addition to accepting setting operations, operation panel 107 also provides various information to the user.

The control device 100 determines whether the paper is worn out based on the image acquired by the scanner 105. If the control device 100 determines that the paper is worn out during the execution of a print job, it causes the operation panel 107 to display information including the measurement values measured by the measuring device 106. This information may further include characteristic values of the paper corresponding to the type specified by the print job and the cause of the wear. This information may also further include a method for the user to deal with the problem.

An engineer can infer the cause of the wear from the measurement values. An experienced operator can infer the cause of the wear from the measurement values and the characteristic values of the paper corresponding to the type specified by the print job. Even an inexperienced operator can grasp the cause of the wear if it is displayed on the operation panel 107. Once the cause of the wear is known, the user can more easily determine how to resolve the wear. This improves the efficiency of the user's work to resolve the wear.

Furthermore, if the measures that the user should take to resolve the waste are displayed on the operation panel 107, the measures will be clear to the user. This improves the efficiency of the user's work to resolve the waste.

(2. Hardware Configuration)
The hardware configuration of the image forming apparatus 1 will be described with reference to Fig. 2. Fig. 2 is a block diagram showing the main hardware configuration of the image forming apparatus in embodiment 1. In addition to the printer 104, scanner 105, measuring device 106, operation panel 107, and control device 100 described above, the image forming apparatus 1 further includes a conveying unit 103, a communication interface 108, a memory card interface 109, and a storage device 120. These components are connected to each other via an internal bus 119 so as to be able to communicate with each other.

The control device 100 includes a processor 101 and a main memory 102. The processor 101 is, for example, configured with at least one integrated circuit. The integrated circuit is, for example, configured with at least one CPU (Central Processing Unit), at least one ASIC (Application Specific Integrated Circuit), at least one FPGA (Field Programmable Gate Array), or a combination thereof.

The processor 101 implements various processes according to this embodiment by expanding the program 121 stored in the storage device 120 into the main memory 102 and executing it. The main memory 102 is composed of volatile memory and functions as a work memory required for the processor 101 to execute the program.

The transport unit 103 includes a transport roller and a drive motor for driving the transport roller. The transport roller rotates while holding the paper, thereby transporting the paper.

The communication interface 108 exchanges data and signals with an external device. An example of an external device is the terminal device 500 shown in FIG. 1. As an example, the image forming device 1 receives a print job including document data to be printed from the terminal device 500 via the communication interface 108.

Memory card interface 109 mediates data transmission between processor 101 and memory card 109A. Memory card 109A may be a general-purpose semiconductor storage device such as an SD (Secure Digital), a magnetic recording medium such as a flexible disk, or an optical recording medium such as a CD-ROM (Compact Disk Read Only Memory).

The storage device 120 is, for example, a hard disk. As an example, the storage device 120 stores a program 121 for implementing various processes according to this embodiment and a print job 122.

Program 121 is provided stored on a storage medium such as memory card 109A. Program 121 is read from memory card 109A by memory card interface 109 and installed on image forming device 1.

Program 121 may be provided not as a standalone program, but as part of an arbitrary program. In this case, it works in cooperation with the arbitrary program to realize the processing according to this embodiment. Even if a program does not include some of these modules, it does not deviate from the spirit of image forming apparatus 1 according to this embodiment. In addition, some or all of the functions provided by program 121 may be realized by dedicated hardware.

In addition, instead of installing the program 121 stored on the memory card 109A into the image forming device 1, a program downloaded from a distribution server or the like via the communication interface 108 may be installed into the image forming device 1.

In addition to the manuscript data to be printed, the print job 122 also includes job information and page information. Here, we will explain the print job with reference to Figure 3. Figure 3 is a diagram showing an example of a print job.

The print job 122 includes job information and page information. The job information includes a job number, a name that identifies the manuscript data, and the total number of pages of the manuscript data. The page information includes, for each page, the paper size, a number (profile number) that identifies the type of paper, and information indicating which paper feed tray the paper will be fed from (tray number). In this way, in image forming device 1 (see Figure 1), the type of paper on which an image will be formed and which paper feed tray the paper will be fed from are specified by the print job.

Referring again to FIG. 2, the storage device 120 further stores a correct image 123, a characteristic information table 124, and a tray information table 125. These will be described later.

(3. Modules of Image Forming Apparatus)
Modules realized by the processor 101 in the first embodiment will be described with reference to Fig. 4. Fig. 4 is a block diagram showing an example of modules realized by the processor in the first embodiment. In the first embodiment, the processor 101 executes the program 121 to realize a first determination unit 131, an estimation unit 132, a second determination unit 133, and an instruction unit 134.

The first determination unit 131 determines whether the paper is worn out based on the image of the paper acquired by the scanner 105. In detail, the first determination unit 131 determines whether the paper is worn out by comparing the image of the paper acquired by the scanner 105 with the correct image 123 stored in the storage device 120.

The correct image 123 is a correct example of an image formed by the printer 104 (see Figure 2) and is stored in the storage device 120 based on input operations by the user. As one example, the correct image 123 is an image obtained by scanning a test print proof. As another example, the correct image 123 may be an image obtained by color-converting a raster image converted from the original data (vector image) included in the print job 122 to RGB.

The first determination unit 131 compares the image of the paper acquired by the scanner 105 with the correct image 123, and determines whether the paper is worn out by comparing the density, color, position, etc. of the image in the image of the paper acquired by the scanner 105 with those in the correct image 123.

When the first determination unit 131 determines that the paper is worn, the estimation unit 132 estimates the cause of the wear from the measurement values measured by the measuring device 106. As an example, the estimation unit 132 references the characteristic information table 124 and estimates the cause of the wear by comparing the measurement values measured by the measuring device 106 with the characteristic values corresponding to the type specified by the print job.

Now, the characteristics information table 124 will be described with reference to Figure 5. Figure 5 is a diagram showing an example of a characteristics information table. The characteristics information table 124 is a table that associates paper types, numbers (profile No.) that can identify those types, and characteristic values of the paper corresponding to those types. The types of characteristic values associated with the characteristics information table 124 match the types of characteristic values measured by the measuring device 106, and in this embodiment, these are smoothness, basis weight, paper thickness, and moisture content.

Referring again to FIG. 4, when the first determination unit 131 determines that the paper is worn, the estimation unit 132 first references the print job 122 and identifies the type of paper specified by the print job 122. Next, the estimation unit 132 extracts characteristic values corresponding to the identified paper type from the characteristic information table 124. As an example, if the print job 122 is the print job shown in FIG. 3, "2" is specified as the profile number, and therefore the estimation unit 132 extracts the smoothness (AAA_2 to AAZ_2), basis weight (BBB_2 to BBZ_2), paper thickness (CCC_2 to CCZ_2), and moisture content (DDD_2 to DDZ_2) associated with the profile number "2" in the characteristic information table 124 shown in FIG. 5.

The estimation unit 132 then sets the value indicating a first characteristic among the extracted characteristic values as a first threshold, and compares the values indicating the first characteristic among the measurement values measured by the measurement device 106 with the first threshold for each type of characteristic value. The estimation unit 132 also sets the value indicating a second characteristic among the extracted characteristic values as a second threshold, and compares the values indicating the second characteristic among the measurement values measured by the measurement device 106 with the second threshold.

If any of the measurement values (smoothness, basis weight, and paper thickness) indicating the first characteristic measured by the measuring device 106 exceeds a first threshold, the estimation unit 132 estimates that the cause of the wear is the wrong type of paper. In particular, if the measurement value for at least one of the smoothness, basis weight, and paper thickness exceeds the first threshold, the estimation unit 132 estimates that the cause of the wear is the wrong type of paper.

On the other hand, if none of the measurement values (smoothness, basis weight, and paper thickness) indicating the first characteristic measured by the measuring device 106 exceed the first threshold, the estimation unit 132 estimates that the cause of the wear is a factor related to the image forming device 1. In particular, if none of the measurement values for smoothness, basis weight, and paper thickness exceed the first threshold, the estimation unit 132 estimates that the cause of the wear is a factor related to the image forming device 1.

Furthermore, if none of the measurement values (smoothness, basis weight, and paper thickness) indicating the first characteristic measured by the measuring device 106 exceed the first threshold value, and the value (moisture content) indicating the second characteristic among the measurement values exceeds the second threshold value, the estimation unit 132 estimates that the cause of the waste is the fixing temperature, which is a factor related to the image forming device 1.

When it is estimated that the cause of the wear is the wrong type of paper, the second determination unit 133 determines whether there is at least one other tray (excluding the tray containing the paper determined to be worn) that contains paper with characteristics corresponding to the type specified by the print job 122 (hereinafter also referred to as an "alternate tray"). The second determination unit 133 determines whether there is an alternative tray based on the characteristic values contained in the characteristic information table 124 and the setting values contained in the tray information table 125.

Now, referring to Figure 6, the tray information table 125 will be described. Figure 6 is a diagram showing an example of a tray information table. The tray information table 125 is a table that associates information about each tray included in the paper feed tray T (see Figure 1). The user inputs information about each tray from the operation panel 107. As an example, the tray information table 125 associates a number (tray number) that can identify the tray with the type of paper stored in that tray, the size of that paper, and the characteristic values (setting values) of that paper.

Referring again to FIG. 4, when the second determination unit 133 determines that the cause of the wear is the wrong type of paper, it first references the tray information table 125 and extracts, for each tray, the setting values corresponding to at least one tray other than the tray specified by the print job 122 among the paper feed trays T (see FIG. 1). The tray specified by the print job 122 is the tray that contained the paper determined to be worn.

The second determination unit 133 then references the print job 122 and identifies the specified paper type. The second determination unit 133 then extracts characteristic values corresponding to the identified paper type from the characteristic information table 124. The second determination unit 133 then sets the characteristic values extracted from the characteristic information table 124 as third threshold values, and compares the setting values extracted from the tray information table 125 with the third threshold values for each type of characteristic value.

If there is a tray associated with a setting value that does not exceed the third threshold for all of the compared types, the second determination unit 133 determines that an alternative tray exists and identifies that tray as an alternative tray.

When the first determination unit 131 determines that paper is worn out during execution of the print job 122, the instruction unit 134 instructs the operation panel 107 to display information including the measurement values measured by the measuring device 106. The information including the measurement values may include characteristic values of the paper corresponding to the type specified by the print job, the cause of the wear estimated by the estimation unit 132, and a message urging paper to be fed from an alternative tray identified by the second determination unit 133.

In addition to or instead of instructing the operation panel 107 to display information including the measurement values, the instruction unit 134 may instruct the terminal device 500 (see FIG. 1) to display the information. Furthermore, if the image forming device 1 is equipped with a speaker, in addition to or instead of instructing the operation panel 107 to display information including the measurement values, the instruction unit 134 may instruct the speaker to output the information. This eliminates the need for the user to be constantly present in front of the image forming device 1, thereby improving user convenience.

(4. Processing Executed by Image Forming Apparatus)
The processing executed by the image forming apparatus 1 will be described with reference to FIG. 7. FIG. 7 is a diagram showing an example of processing executed by the image forming apparatus in the first embodiment. The processing shown in FIG. 7 is an example of processing executed when a print job including document data consisting of N pages (N is an integer equal to or greater than 1) is executed. The measuring device 106 is also assumed to be provided downstream of the fixing unit 104D and upstream of the scanner 105 on the conveying path 150 (see FIG. 1). The processing shown in FIG. 7 is realized by the processor 101 shown in FIG. 4 executing the program 121 (see FIG. 4).

In step S1, the processor 101 sets a variable n (n is an integer greater than or equal to 1) to 1.

In step S2, the processor 101 controls the conveying unit 103 (see Figure 2) to send one sheet of paper from the paper feed tray T (see Figure 1) specified by the print job to the conveying path 150 (see Figure 1).

In step S3, the processor 101 controls the printer 104 (see Figure 2) to form an image of the nth page of the manuscript data on paper.

In step S4, the processor 101 receives the paper characteristic values (smoothness, basis weight, paper thickness, and moisture content) measured by the measuring device 106 (see Figure 2) as measurement values from the measuring device 106.

In step S5, the processor 101 receives from the scanner 105 an image of the paper captured by the scanner 105 (see Figure 2).

In step S6, processor 101 compares the image of the paper received in step S5 with the correct image 123 (see Figure 4) to determine whether the paper is worn out. If the paper is determined to be worn out (YES in step S6), processor 101 proceeds to step S7. On the other hand, if the paper is determined not to be worn out (NO in step S6), processor 101 proceeds to step S14.

In step S7, the processor 101 determines whether at least one of the smoothness, basis weight, and paper thickness received in step S4 exceeds a threshold. The threshold is the smoothness, basis weight, and paper thickness of the paper corresponding to the type specified by the print job, and is associated with the characteristics information table 124 (see Figure 4).

If it is determined in step S4 that at least one of the smoothness, basis weight, and paper thickness received exceeds the threshold value (YES in step S7), the processor 101 proceeds to step S8. On the other hand, if it is determined that none of the smoothness, basis weight, and paper thickness received in step S4 exceeds the threshold value (NO in step S7), the processor 101 proceeds to step S11.

In step S8, processor 101 determines whether or not an alternative paper feed tray is available. If it is determined that an alternative paper feed tray is available (YES in step S8), processor 101 proceeds to step S9. On the other hand, if it is determined that an alternative paper feed tray is not available (NO in step S8), processor 101 proceeds to step S10.

In step S9, the processor 101 instructs the operation panel 107 (see Figure 4) to display the measurement values received in step S4, the cause of the waste, and the solution (feeding paper from an alternative paper feed tray).

Now, with reference to Figure 8, we will explain screen D1 displayed on the operation panel 107 as a result of the processing in step S9. Figure 8 is a diagram showing an example of a screen displayed on the operation panel. Screen D1 is an example of a screen displayed on the operation panel 107 as a result of the processing in step S9.

Screen D1 includes image 81 showing the measurement values measured by measuring device 106 (see Figure 2), image 82 showing the cause of the wear, and image 83 showing how to deal with the problem. Screen D1 also includes image 84 showing the characteristic values of the paper corresponding to the type specified by the print job. The characteristic values of the paper corresponding to the type specified by the print job in image 84 are values associated with characteristic information table 124 (see Figure 4). Display of images 81 to 84 on operation panel 107 is instructed by instruction unit 134 (see Figure 4).

Screen D1 also includes icons 85 corresponding to each tray of paper feed trays T (see Figure 1), and icons 86 for accepting user operations to change settings. Display of icons 85 and 86 on operation panel 107 is instructed by instruction unit 134. Icons 85 and 86 are icons for accepting a change of the paper feed tray to be used. As an example, when the user selects icon 85 corresponding to "Tray 2" and presses icon 86, the paper feed tray to be used is changed from the tray specified in the print job to Tray 2.

Note that screen D1 only needs to include at least image 81.

Referring again to FIG. 7, in step S10, the processor 101 instructs the operation panel 107 to display the measurement values received in step S4, the cause of the waste, and how to deal with it (check the type of paper in the paper feed tray).

Now, with reference to Figure 9, we will explain screen D2 displayed on the operation panel 107 as a result of the processing in step S10. Figure 9 is a diagram showing an example of a screen displayed on the operation panel. Screen D2 is an example of a screen displayed on the operation panel 107 as a result of the processing in step S10.

Screen D2 includes image 81 showing the measurement values measured by measuring device 106 (see Figure 2), image 82 showing the cause of the wear, and image 83 showing how to deal with the problem. Screen D2 also includes image 84 showing the characteristic values of the paper corresponding to the type specified by the print job. The characteristic values of the paper corresponding to the type specified by the print job in image 84 are values associated with characteristic information table 124 (see Figure 4). The display of images 81 to 84 on operation panel 107 is instructed by instruction unit 134 (see Figure 4). It is sufficient that screen D2 include at least image 81.

Referring again to FIG. 7, in step S11, the processor 101 determines whether the moisture content received in step S4 exceeds a threshold value. The threshold value is the moisture content of the paper corresponding to the type specified by the print job, and is associated with the characteristics information table 124 (see FIG. 4).

If it is determined in step S4 that the moisture content received exceeds the threshold value (YES in step S11), the processor 101 proceeds to step S12. On the other hand, if it is determined in step S4 that the moisture content received does not exceed the threshold value (NO in step S11), the processor 101 proceeds to step S13.

In step S12, the processor 101 instructs the operation panel 107 to display the measurement values received in step S4, the cause of the waste, and how to deal with it (adjust the fixing temperature).

Now, with reference to Figure 10, we will explain screen D3 displayed on the operation panel 107 as a result of the processing in step S12. Figure 10 is a diagram showing an example of a screen displayed on the operation panel. Screen D3 is an example of a screen displayed on the operation panel 107 as a result of the processing in step S12.

Screen D3 includes image 81 showing the measurement values measured by measuring device 106 (see Figure 2), image 82 showing the cause of the wear, and image 83 showing how to deal with the problem. Screen D3 also includes image 84 showing the characteristic values of the paper corresponding to the type specified by the print job. The characteristic values of the paper corresponding to the type specified by the print job in image 84 are values associated with characteristic information table 124 (see Figure 4). The display of images 81 to 84 on operation panel 107 is instructed by instruction unit 134 (see Figure 4). It is sufficient that screen D3 include at least image 81.

Referring again to FIG. 7, in step S13, the processor 101 instructs the operation panel 107 to display the measurement values received in step S4, the cause of the waste, and how to deal with the problem (adjustments related to the image forming apparatus other than the fixing temperature).

Now, with reference to Figure 11, we will explain screen D4 displayed on the operation panel 107 as a result of the processing in step S13. Figure 11 is a diagram showing an example of a screen displayed on the operation panel. Screen D4 is an example of a screen displayed on the operation panel 107 as a result of the processing in step S13.

Screen D4 includes image 81 showing the measurement values measured by measuring device 106 (see FIG. 2), image 82 showing the cause of the wear, and image 83 showing how to deal with the problem. Image 83 may include a message encouraging adjustment of settings of the image forming device other than the fixing temperature, such as settings related to the paper transport speed or paper feed timing. Screen D4 also includes image 84 showing the characteristic values of the paper corresponding to the type specified by the print job. The characteristic values of the paper corresponding to the type specified by the print job in image 84 are values associated with characteristic information table 124 (see FIG. 4). Display of images 81 to 84 on operation panel 107 is instructed by instruction unit 134 (see FIG. 4). It is sufficient that screen D4 includes at least image 81.

Referring again to FIG. 7 , in step S14, processor 101 determines whether variable n is greater than or equal to N. If it is determined that variable n is greater than or equal to N (YES in step S14), processor 101 ends the series of processes shown in FIG. 7 . On the other hand, if it is determined that variable n is less than N (NO in step S14), processor 101 proceeds to step S15.

In step S15, the processor 101 increments the variable n by 1 and proceeds to step S2.

In this way, according to the first embodiment, when paper is determined to be worn out during the execution of a print job, information including the paper characteristic values (measured values) measured by the measuring device 106 is output to an output device such as the operation panel 107. An engineer can infer the cause of the wear from the measured values. If the cause of the wear is known, the user can more easily determine how to resolve the wear. This improves the efficiency of the user's work to resolve the wear.

Furthermore, according to embodiment 1, when paper is determined to be worn out during the execution of a print job, in addition to the measurement values, the characteristic values of the paper corresponding to the type specified by the print job are output to the output device. An experienced operator can infer the cause of the wear from the measurement values and the characteristic values of the paper corresponding to the type specified by the print job. Once the cause of the wear is known, the user can more easily determine how to resolve the wear. This improves the user's work efficiency in resolving the wear.

Furthermore, according to embodiment 1, if paper is determined to be worn out during the execution of a print job, the cause of the wear is output to the output device in addition to the measurement value. This allows even an inexperienced operator to understand the cause of the wear, improving the efficiency of the user's work to resolve the wear.

Furthermore, according to the first embodiment, if paper is determined to be worn out during the execution of a print job, in addition to the measurement value, the output device outputs the corrective action that the user should take to resolve the wear. This clarifies the corrective action that the user should take, improving the efficiency of the user's work to resolve the wear.

Note that the image forming apparatus 1 may be a color printing machine or a monochrome printing machine. Furthermore, in the above, the measuring device 106 measures smoothness, basis weight, and paper thickness as values indicating the first characteristic, and moisture content as a value indicating the second characteristic, but the types of characteristic values measured by the measuring device 106 are not limited to this. The measuring device 106 may measure at least one of smoothness, basis weight, and paper thickness as a value indicating the first characteristic. Furthermore, the measuring device 106 may measure ream weight instead of paper thickness as a value indicating the first characteristic. Furthermore, the measuring device 106 may measure resistance instead of moisture content as a value indicating the second characteristic.

The measuring device 106 may also measure only the value indicating the first characteristic, without measuring the value indicating the second characteristic. In that case, in response to a determination that none of the smoothness, basis weight, and paper thickness received in step S4 exceed the threshold value (NO in step S7), the processor 101 instructs the operation panel 107 to display the measurement value received in step S4, the cause of the waste (items related to the image forming device), and a solution (adjustments related to the image forming device), and proceeds to step S14.

In the example shown in FIG. 7, the processor 101 executes the process of step S11 when it is determined that none of the smoothness, basis weight, and paper thickness received in step S4 exceed the threshold value (NO in step S7). However, if it is determined that the paper is worn (YES in step S6), it may execute both the process of step S7 and the process of step S11.

In addition, the image forming device 1 may not include the estimation unit 132 or the second determination unit 133. If the image forming device 1 does not include the estimation unit 132 or the second determination unit 133, in response to the determination that the paper is worn (YES in step S6), the processor 101 instructs the operation panel 107 to display the measurement values received in step S4, and proceeds to step S14. In such a case, the processor 101 may instruct the operation panel 107 to display the measurement values received in step S4, as well as the characteristic values of the paper corresponding to the type specified by the print job, and then proceeds to step S14. The characteristic values of the paper corresponding to the type specified by the print job are values associated with the characteristic information table 124.

Also, if the image forming device 1 does not have the second determination unit 133, the processor 101 proceeds to step S10 in response to determining that at least one of the smoothness, basis weight, and paper thickness received in step S4 exceeds the threshold value (YES in step S7).

[Embodiment 2]
The image forming apparatus in the second embodiment also has a configuration similar to that of the image forming apparatus 1 in the first embodiment. In the second embodiment, the measuring device 106 is provided downstream of the scanner 105 on the conveying path 150 (for example, at position P1 in FIG. 1 ), and the characteristic values of the paper are measured by the measuring device 106 only when the paper is determined to be worn.

Modules realized by the processor 101 in embodiment 2 will be described with reference to Figure 12. Figure 12 is a block diagram showing an example of modules realized by the processor in embodiment 2. In embodiment 2, when the processor 101 executes the program 121, a transmission unit 135 is realized in addition to the first determination unit 131, estimation unit 132, second determination unit 133, and instruction unit 134 described above.

When the first determination unit 131 determines that the paper is worn, the transmitting unit 135 transmits a signal to the measuring device 106. As an example, the transmitting unit 135 cooperates with a signal generating circuit (not shown) to transmit a signal to the measuring device 106. In response to receiving the signal, the measuring device 106 measures the characteristic values of the transported paper.

The processing executed by the image forming apparatus in embodiment 2 will be described with reference to Figure 13. Figure 13 is a diagram showing an example of processing executed by the image forming apparatus in embodiment 2. The processing shown in Figure 13 is an example of processing executed when a print job including manuscript data consisting of N pages (N is an integer equal to or greater than 1) is executed. The processing shown in Figure 13 is realized by the processor 101 shown in Figure 12 executing program 121 (see Figure 12).

The process shown in Figure 13 is similar to the process shown in Figure 7, except that step S6A has been added and that the process of receiving measurement values (step S4) is performed after step S6A. Processes in Figure 13 that are similar to those shown in Figure 7 are given the same step numbers and will not be described again.

First, processor 101 executes steps S1 to S3. Next, processor 101 executes step S5. Next, processor 101 executes step S6. If it is determined that the paper is worn out (YES in step S6), processor 101 proceeds to step S6A. On the other hand, if it is determined that the paper is not worn out (NO in step S6), processor 101 proceeds to step S14.

In step S6A, the processor 101 transmits a signal to the measuring device 106. After step S6A, the processor 101 proceeds to step S4.

The processor 101 then executes step S4 and then proceeds to step S7. Note that the processing from step S7 onwards is as described in Figure 7.

In this way, according to the second embodiment, if paper is determined to be worn out during the execution of a print job, information including the paper characteristic values (measurement values) measured by the measuring device 106 is output to an output device such as the operation panel 107. This improves the efficiency of the user's work to resolve the wear.

Furthermore, according to the second embodiment, the characteristic values of the paper are measured only when the paper is determined to be worn. Measurement by the measuring device 106 takes a certain amount of time, but according to the second embodiment, measurement is performed only when the paper is determined to be worn, which prevents a decrease in the productivity of the image forming device.

[Third embodiment]
In the third embodiment, the measuring device is provided on a transport path leading to a tray onto which paper determined to be worn is discharged, and measures the characteristic values of the paper upon detecting the paper being transported.

Figure 14 is a diagram showing an image forming apparatus in embodiment 3. Image forming apparatus 1A differs from image forming apparatus 1 (see Figure 1) in the following three points. The first difference is that it is equipped with two types of paper output trays. Image forming apparatus 1A is equipped with paper output tray 141 and paper output tray 142. Paper output tray 141 is a tray to which paper that has not been determined to be worn is output, and is an example of a "first tray." Paper output tray 142 is a tray to which paper that has been determined to be worn is output, and is an example of a "second tray."

The second difference is that the paper transport path 150 includes a first transport path 151 that leads to the paper output tray 141, and a second transport path 152 that leads to the paper output tray 142. The transport unit 103 (see FIG. 2) further includes a switch mechanism 153 for branching the transport path 150 into the first transport path 151 and the second transport path 152. The switch mechanism 153 switches the transport path 150 to the first transport path 151 when the first determination unit 131 (see FIG. 4) determines that the paper is not worn, and switches the transport path 150 to the second transport path 152 when the first determination unit 131 determines that the paper is worn.

The third point is that the measuring device 106 is provided on the second conveying path 152. The measuring device 106 measures the characteristic values of the paper in response to detecting the paper that has been conveyed. Because the second conveying path 152 leads to the paper output tray 142, to which paper determined to be worn is discharged, in the image forming apparatus 1A, the measuring device 106 measures the characteristic values of the paper only when the paper is determined to be worn.

The processing executed by the image forming apparatus in embodiment 3 will be described with reference to Figure 15. Figure 15 is a diagram showing an example of processing executed by the image forming apparatus in embodiment 3. The processing shown in Figure 15 is an example of processing executed when a print job including manuscript data consisting of N pages (N is an integer equal to or greater than 1) is executed. The processing shown in Figure 15 is realized by the processor 101 shown in Figure 4 executing program 121 (see Figure 4).

The process shown in Figure 15 is similar to the process shown in Figure 7, except that the process of receiving measurement values (the process of step S4) is executed when it is determined that the paper is worn (YES in step S6). Processes in Figure 15 that are similar to the processes shown in Figure 7 are given the same step numbers and will not be described again.

First, processor 101 executes steps S1 to S3. Next, processor 101 executes step S5. Next, processor 101 executes step S6. If it is determined that the paper is worn out (YES in step S6), processor 101 executes step S4 and then proceeds to step S7. On the other hand, if it is determined that the paper is not worn out (NO in step S6), processor 101 proceeds to step S14. Note that the processing from step S7 onwards is as described in Figure 7.

In this way, according to the third embodiment, if paper is determined to be worn out during the execution of a print job, information including the paper characteristic values (measured values) measured by the measuring device 106 is output to an output device such as the operation panel 107. This improves the efficiency of the user's work to resolve the wear.

Furthermore, according to the third embodiment, the characteristic values of the paper are measured only when the paper is determined to be worn. Measurement by the measuring device 106 takes a certain amount of time, but according to the third embodiment, measurement is performed only when the paper is determined to be worn, which prevents a decrease in the productivity of the image forming device.

[Fourth embodiment]
In the fourth embodiment, when the paper is not determined to be worn, the measurement value is output to an output device such as an operation panel in response to a determination that a change has occurred in the density of the inspection image.

The image forming apparatus in embodiment 4 has a configuration similar to that of image forming apparatus 1 in embodiment 1 (see Figure 1). Printer 104 (see Figure 2) forms a test image on paper in addition to an image based on the manuscript data included in the print job. The paper on which the test image is formed may be the same paper as the paper on which the image based on the manuscript data included in the print job is formed, or it may be a different paper.

Now, we will explain the inspection image with reference to Figure 16. Figure 16 is a diagram showing an example of an inspection image. In the example shown in Figure 16, inspection image G1 is formed on the same paper as the paper on which an image based on the manuscript data included in the print job is formed. Inspection image G1 is an image used to check whether the density of each color, cyan, magenta, yellow, and black, is appropriate. Image G2 is an image formed based on the manuscript data included in the print job.

The scanner 105 (see Figure 4) scans a sheet of paper on which the test image G1 is formed, thereby acquiring an image of the paper. A test image with the appropriate density as the correct image is stored in advance in the storage device 120 (see Figure 4). The first determination unit 131 (see Figure 4) compares the correct image with the image of the paper on which the test image G1 is formed, acquired by the scanner 105, to determine whether a change has occurred in the density of the test image G1. A change in the density of the test image G1 means that there is a difference of a predetermined value or more between the density of the test image G1 and the density of the correct image. If printing continues in such a case, the image quality intended by the user may not be achieved, and the paper may become worn.

When the first determination unit 131 does not determine that the paper is worn, and it is determined that a change has occurred in the density of the inspection image G1, the instruction unit 134 (see Figure 4) further instructs an output device such as the operation panel 107 to output the characteristic values (measurement values) of the paper measured by the measurement device 106 (see Figure 4).

The processing executed by the image forming apparatus in embodiment 4 will be described with reference to Figure 17. Figure 17 is a diagram showing an example of processing executed by the image forming apparatus in embodiment 4. The processing shown in Figure 17 is an example of processing executed when a print job including manuscript data consisting of N pages (N is an integer equal to or greater than 1) is executed. The processing shown in Figure 17 is realized by the processor 101 shown in Figure 4 executing program 121 (see Figure 4).

The process shown in Figure 17 is similar to the process shown in Figure 7, except for the addition of step S6B. The same step numbers are used for steps in Figure 17 that are similar to the steps in Figure 7, and descriptions will not be repeated. Here, only step S6B will be described.

In step S6B, processor 101 determines whether a change has occurred in the density of the inspection image. If it is determined that a change has occurred in the density of the inspection image (YES in step S6B), processor 101 proceeds to step S7. On the other hand, if it is determined that no change has occurred in the density of the inspection image (NO in step S6B), processor 101 proceeds to step S14.

In this way, according to the fourth embodiment, if paper is determined to be worn out during the execution of a print job, information including the paper characteristic values (measured values) measured by the measuring device 106 is output to an output device such as the operation panel 107. This improves the efficiency of the user's work to resolve the wear.

Furthermore, according to the fourth embodiment, if the paper is not determined to be worn, information including the paper characteristic values (measured values) measured by the measuring device 106 is output to an output device such as the operation panel 107 in response to a change in the density of the inspection image. If printing continues while a change in the density of the inspection image has occurred, the image quality intended by the user may not be achieved, and the paper may become worn. According to the fourth embodiment, if the paper is not determined to be worn, information including the paper characteristic values (measured values) measured by the measuring device 106 is output to an output device such as the operation panel 107 in response to a change in the density of the inspection image. An engineer can use the measurement values to estimate which parts of the image forming device need to be adjusted, making it possible to make adjustments before wear occurs. Therefore, according to the fourth embodiment, the occurrence of wear can be suppressed.

The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims, not the above description, and is intended to include all modifications that are equivalent in meaning to and within the scope of the claims.

1, 1A Image forming device, 81, 82, 83, 84, G2 Image, 85, 86 Icon, 99 Network, 100 Control device, 101 Processor, 102 Main memory, 103 Conveyor unit, 104 Printer, 104A Photosensitive member, 104B Intermediate transfer belt, 104C Secondary transfer unit, 104D Fixing unit, 105 Scanner, 105A, 105B Image sensor, 106 Measuring device, 107 Operation panel, 108 Communication interface, 109 Memory card interface, 109A Memory card, 119 Internal bus, 120 Storage device, 121 Program, 122 Print job, 123 Correct image, 124 Characteristics information table, 125 Tray information table, 131 First determination unit, 132 Estimation unit, 133 Second determination unit, 134 Instruction unit, 135 Transmission unit, 140, 141, 142: output tray, 150: transport path, 151: first transport path, 152: second transport path, 153: switch mechanism, 500: terminal device, D1, D2, D3, D4: screen, G1: inspection image, P1, P2: position, T: paper feed tray.

Claims (12)

an image forming unit that forms an image on a sheet transported through a transport path;
a scanner for scanning the paper sheet conveyed along the conveyance path to acquire an image of the paper sheet;
a measurement unit that measures a characteristic value of the paper transported along the transport path;
a first determination unit that determines whether the paper is worn out or not based on the image acquired by the scanner;
an instruction unit that instructs an output device to output information including a measurement value measured by the measurement unit when the paper is determined to be worn out during execution of a print job. the image forming apparatus further includes an estimation unit that, when it is determined that the paper is worn, estimates a cause of the wear from the measurement value;
The image forming apparatus according to claim 1 , wherein the information further includes a cause of the waste. the image forming apparatus further includes a storage device that stores the characteristic values of the paper by type of the paper;
3. The image forming apparatus according to claim 2, wherein when the paper is determined to be worn, the estimation unit estimates the cause of the wear by comparing the measurement value with the characteristic value corresponding to the type specified by the print job. the characteristic value includes a value indicative of a first characteristic;
The image forming apparatus of claim 3, wherein the estimation unit sets a value indicating the first characteristic among the characteristic values corresponding to the type specified by the print job as a first threshold value, and if the value indicating the first characteristic among the measured values exceeds the first threshold value, estimates that the cause of the waste is a different type of paper. The image forming apparatus of claim 4, wherein the value indicating the first characteristic includes at least one of smoothness, basis weight, and paper thickness. The image forming device of claim 4 or claim 5, wherein the estimation unit estimates that the cause of the waste is an issue related to the image forming device when the value indicating the first characteristic among the measured values does not exceed the first threshold. the characteristic value further includes a value indicating a second characteristic different from the first characteristic;
the value indicating the second property is water content;
the image forming unit is a printer equipped with a fixing unit,
the measuring unit is provided downstream of the fixing unit on the conveying path,
The image forming apparatus of claim 6, wherein the estimation unit sets a value indicating the second characteristic among the characteristic values corresponding to the type specified by the print job as a second threshold value, and when a value indicating the first characteristic among the measured values does not exceed the first threshold value and a value indicating the second characteristic among the measured values exceeds the second threshold value, the estimation unit estimates that the cause of the waste is the fixing temperature in the fixing unit among factors related to the image forming apparatus. the image forming apparatus further includes a paper feed tray including a tray in which the paper determined to be worn out was stored and at least one other tray other than the tray in which the paper was stored,
the storage device further stores the characteristic values of the sheets accommodated in the paper feed trays as set values for each tray;
the image forming apparatus further comprises a second determination unit that, when it is estimated that the cause of the waste is the wrong type of paper, determines whether or not there is at least one other tray storing paper having characteristics corresponding to the type specified by the print job by setting the characteristic value corresponding to the type specified by the print job as a third threshold value and comparing the setting value corresponding to the at least one other tray with the third threshold value;
An image forming apparatus according to any one of claims 3 to 7, wherein, when it is determined that there is at least one other tray containing paper having characteristics corresponding to the type specified by the print job, the information further includes a message prompting the user to feed paper from the other tray. the image forming apparatus further includes a transmitting unit that transmits a signal to the measuring unit when the paper is determined to be worn out;
The image forming apparatus according to any one of claims 1 to 8, wherein the measuring unit is provided downstream of the scanner on the conveying path, and measures the characteristic value of the conveyed paper in response to receiving the signal. the transport path includes a first transport path leading to a first tray onto which sheets not determined to be worn are discharged, and a second transport path leading to a second tray onto which sheets determined to be worn are discharged,
The image forming apparatus according to any one of claims 1 to 9, wherein the measuring unit is provided in the second transport path and measures the characteristic value of the paper in response to detecting the paper being transported. the image forming unit further forms a test image on the same paper as the paper or on another paper different from the paper;
the first determination unit further determines whether or not a change in density of the test image has occurred based on an image of the paper on which the test image has been formed, the image being acquired by the scanner;
An image forming apparatus according to any one of claims 1 to 10, wherein the instruction unit further instructs the output device to output the measurement value when it is determined that a change has occurred in the density of the inspection image if the paper is not determined to be worn. 1. A computer-implemented imaging method comprising:
forming an image on a sheet conveyed through a conveyance path;
acquiring an image of the paper by scanning the paper being transported along the transport path;
acquiring characteristic values of the paper transported through the transport path as measurement values;
determining whether the paper is worn out or not based on the acquired image;
and instructing an output device to output information including the acquired measurement value when the paper is determined to be worn out during execution of a print job.