Image forming apparatus and method of operating image forming apparatus

Abstract

The time required for replacing the fixing unit is shortened. The image forming apparatus includes a control section, a display section, a detachable fixing unit, and a temperature measuring section that measures a temperature of the fixing unit or a vicinity thereof. The control unit displays, on the display unit, prediction information relating to the end of the cooling operation of the fixing unit in the cooling load on the basis of the measurement result of the temperature measurement unit.

Description

Technical Field

[0001] The present disclosure relates to an image forming apparatus and the like. Background Art

[0002] Conventionally, as a printing method for image forming apparatuses such as printers and multifunction machines, there is a dry electrophotographic method (laser printer method). In the laser printer method, after a toner is transferred to form an image on a paper, the image on the paper is heated and pressurized to fix the image on the paper. Therefore, an image forming apparatus that prints using the laser printing method is equipped with a fuser for heating and pressurizing the image on the paper.

[0003] The fuser has a fixing component that contacts the paper on which the fixed image is formed. The fixing component is, for example, a fixing belt. The fixing belt is configured so that its length direction is orthogonal to the conveying direction of the paper. In the present application, the width of the paper in the direction orthogonal to the conveying direction of the paper is referred to as the paper width. For example, in a general MFP (MultiFunction Printer) with a scanning function, the sub-scanning direction of the scanner is consistent with the conveying direction of the paper, and the main scanning direction of the scanner is orthogonal to the conveying direction of the paper. Therefore, in a general MFP, the paper width refers to the width of the paper in the main scanning direction.

[0004] Fig.26 (a) is a diagram for explaining the scratches generated on the fixing belt when an A5 paper repeatedly passes through. When an A5 paper 301 repeatedly passes through the fixing belt 303, scratches 305 and 307 are generated on the fixing belt 303 at positions corresponding to the paper width of the A5 paper 301. After these scratches are generated, consider that an A3 paper 309 larger than the A5 paper repeatedly passes through the same fixing belt 303.

[0005] At this time, if Fig.26 As shown in (b), on the fixing belt 303, scratches 311 and 313 are also generated at positions corresponding to the paper width of the A3 paper 309, but the scratches 311 and 313 are located substantially outside the A3 paper 309, and therefore do not affect the printing quality of the A3 paper 309. However, since the scratches 305 and 307 caused by the A5 paper 301 are contained within the paper width of the A3 paper 309, the printing quality of the A3 paper 309 is adversely affected. Specifically, stains 315 and 317 are generated in the A3 paper 309 at positions corresponding to the scratches 305 and 307 caused by the A5 paper 301.

[0006] In order to avoid this problem, it is considered to use the fixing belt only in printing of a specific paper width. Fig. 27 As shown in (a), when printing A5 paper 301, a fixing belt 303 is used. On the other hand, as shown in Fig. 27As shown in (b), when printing A3 paper 309, another fixing belt 321 is used. Due to repeated printing, scratches 305 and 307 are generated on the fixing belt 303. Even if scratches 311 and 313 are generated on the fixing belt 321, since fixing belts are prepared for each paper width, it is possible to avoid the scratches generated by printing other paper widths from adversely affecting the printing quality.

[0007] In this way, another method of replacing the fixing belt or fixing device is disclosed in Japanese Patent Publication No. 2017-003725. The types of media that can pass paper are diverse, and the fixing conditions for determining the final image quality also need to be carefully adjusted according to the thickness, surface properties, and concentration and glossiness of the desired image of the product.

[0008] As a countermeasure to these problems, Japanese Patent Application Laid-Open No. 2017-003725 proposes preparing dedicated fixing devices corresponding to common paper sizes and types of media, and enabling the user to obtain the most appropriate image quality by replacing the fixing devices as needed.

[0009] However, the fuser is generally hot after operation, so when replacing the fuser, it is required to wait for the fuser to cool down to a specified temperature before the replacement operation is carried out in consideration of the high temperature. In this regard, Japanese Patent Publication No. 2017-003725 proposes notifying the user whether the temperature of the installed fuser has dropped below a specified temperature. Summary of the invention Technical Problems to be Solved by the Invention

[0010] According to Japanese Patent Publication No. 2017-003725, although the user is notified when the temperature drops below a specified temperature, the time required for the temperature reduction is not notified. Generally, it takes a certain amount of time for a high-temperature fuser to cool down to a specified temperature, but existing image forming devices do not notify the user of the required time. Therefore, the user needs to continuously monitor the current temperature of the fuser while waiting for the fuser to cool down. If this monitoring is skipped, unnecessary waiting time is generated due to leaving the fuser at a specified temperature, resulting in the possibility that the entire replacement operation of the fuser may be delayed.

[0011] One aspect of the present disclosure has been made in view of such circumstances, and an object of the present invention is to improve the efficiency of the time required for the replacement work of the fixing unit. Technical solutions for solving technical problems

[0012] In order to solve the above-mentioned problem, one aspect of the present disclosure provides an image forming device, including: a control unit, a display unit, a detachable fixing unit, and a temperature measuring unit, wherein the temperature measuring unit measures the temperature of the fixing unit or the temperature near the fixing unit, and the control unit displays prediction information on the display unit based on the measurement result of the temperature measuring unit, and the prediction information is prediction information related to the end of the cooling action of the fixing unit in cooling loading.

[0013] In addition, one aspect of the present disclosure provides a working method of an image forming device, wherein the image forming device has a detachable fixing unit, and the working method includes: a step of measuring the temperature of the fixing unit or the temperature near the fixing unit; and a step of displaying prediction information based on the measurement result, wherein the prediction information is prediction information related to the end of the cooling action of the fixing unit in cooling loading. Beneficial Effects

[0014] According to one aspect of the present disclosure, it is possible to achieve efficiency in the time required for replacement work of the fixing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a functional block diagram of the image forming apparatus according to this embodiment. Figure 2 This is a flowchart for explaining the operation of the image forming apparatus according to the embodiment of the present disclosure. Figure 3 is a diagram showing an example of a main screen displayed on a display section of an image forming apparatus when a fixing unit is replaced according to an embodiment of the present disclosure. Figure 4 is a diagram illustrating an example of a machine adjustment screen displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Figure 5 is a diagram showing an example of an image quality adjustment screen displayed on a display section of an image forming apparatus when a fixing unit is replaced according to an embodiment of the present disclosure. Figure 6 is a diagram showing an example of other function screens displayed on the display section of the image forming apparatus when replacing the fixing unit according to the embodiment of the present disclosure. Figure 7 is a diagram showing an example of a fuser type display screen displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Figure 8 is a diagram showing an example of a precaution confirmation screen displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Fig. 9is a diagram showing an example of a precaution confirmation screen displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Fig.10 is a diagram showing an example of a replacement preparation start screen displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Fig.11 is a diagram illustrating an example of a fuser type designation request screen displayed on a display section of an image forming apparatus when replacing a fuser unit according to an embodiment of the present disclosure. Fig.12 is a diagram showing an example of a replacement confirmation screen displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Fig.13 is a diagram showing an example of a cooling-down screen displayed on a display section of an image forming apparatus when a fixing unit is replaced according to an embodiment of the present disclosure. Fig.14 is a diagram showing an example in which a preparation completion screen is displayed on a display section of an image forming apparatus when replacing a fixing unit according to an embodiment of the present disclosure. Fig.15 1 is a diagram showing an example of a replacement confirmation screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 1 of the embodiment of the present disclosure. Fig.16 1 is a diagram showing an example of a replacement confirmation screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 1 of the embodiment of the present disclosure. Fig.17 1 is a diagram showing an example of a cooling-down screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 2 of the embodiment of the present disclosure. Fig.18 1 is a diagram showing an example of a cooling-down screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 3 of the embodiment of the present disclosure. Fig.19 1 is a diagram showing an example of a replacement confirmation screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 4 of the embodiment of the present disclosure. Fig. 20 1 is a diagram showing an example of a cooling-down screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 4 of the embodiment of the present disclosure. Fig.21 1 is a diagram showing an example of a start timing setting screen displayed on the display section of the image forming apparatus when setting the timing for starting preparation for fixing unit replacement according to Modification 5 of the embodiment of the present disclosure. Fig. 22 This is a diagram showing an example of a screen displayed by other functions executable by the image forming apparatus after the start time of fixing unit replacement preparation is set until the start time according to Modification 5 of the embodiment of the present disclosure. Fig.23 It is shown that in the modification example 5 of the embodiment of the present disclosure, when executing Fig. 20 FIG. 1 is a diagram showing an example of a start confirmation screen displayed on the display unit of the image forming apparatus when the start time of another function is reached. Fig.24 1 is a diagram showing an example of a cooling-down screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 5 of the embodiment of the present disclosure. Fig.25 1 is a diagram showing an example of a cooling-down screen displayed on the display section of the image forming apparatus when replacing the fixing unit according to Modification 6 of the embodiment of the present disclosure. Fig.26 (a) is a diagram for explaining the scratches produced on the fixing belt when an A5 paper passes through. Fig.26 (b) is a diagram for explaining stains generated on an A3 paper when the paper passes through a fixing belt having a scratch. Fig. 27 (a) is a diagram for explaining scratches on a fixing belt for A5 paper when A5 paper passes through. Fig. 27 (b) is a diagram for explaining scratches generated on the fixing belt for A5 paper when A3 paper passes through. DETAILED DESCRIPTION

[0016] 1. Implementation Method 1.1 Functional Structure of Image Forming Device Figure 1 This is a functional block diagram of an image forming device according to one embodiment. The image forming device 1 is an MFP (Multi-Function Printer) or a compound machine, and typically has a copy function, an image scanning function, a fax function, and a printer function. The image forming device 1 may also have other functions, for example, an email sending and receiving function, a file server function, etc.

[0017] The image forming apparatus 1 includes a display unit 3, an operation unit 5, an image input unit 9, a paper feed unit 11, an image forming unit 13, a communication unit 19, a connection unit 21, a storage unit 23, and a control unit 29. The operation unit 5 includes a main power SW7. The image forming unit 13 includes a fixing unit 15, a temperature sensor 17, and a cooling unit 18. The storage unit 23 includes an installation unit type storage unit 25 and a setting information storage unit 27 for each unit type. The control unit 29 includes a cooling time estimation unit 31 and a temperature monitoring unit 33.

[0018] The display unit 3 is a functional unit for displaying images and texts. For example, it is composed of a liquid crystal display (LCD), an organic EL (Electro-luminescence) panel, etc. The display unit 3 can be a single display device or a display device connected to the outside.

[0019] The operation unit 5 receives operations from the user. For example, the operation unit 5 is composed of hardware keys and software keys. In addition, the operation unit 5 includes, for example, a task key for executing tasks such as FAX sending and image reading, and a stop key for stopping the operation. In addition, the operation unit may also include physical operation keys such as the task key, the stop key, the power key, and the power saving key. The main power SW7 is a switch for turning the main power of the image forming apparatus 1 on and off.

[0020] The display unit 3 and the operation unit 5 may be integrally configured. For example, a touch panel display may be used as the display unit 3 and the operation unit 5 .

[0021] The image input unit 9 reads an image (manuscript) and outputs it as image data. The image input unit 9 is composed of a common scanner (image input device). In addition, the image input unit 9 can input image data from an external storage medium such as a USB memory, or can receive images via a network. The sub-scanning direction of the image input unit 9 is consistent with the conveying direction of the paper of the paper feeding unit 11.

[0022] The paper supply unit 11 has a paper supply tray for storing media such as paper, and a conveying mechanism for conveying the media from the paper supply tray to the image forming unit 13. In addition, the paper supply unit 11 may also have a classification mechanism for classifying media (paper) with images formed thereon, a paper discharge tray for discharging the media with images formed thereon, and a conveying mechanism for conveying the media with images formed thereon to the classification mechanism and the paper discharge tray. Furthermore, the paper supply unit 11 may also have a conveying mechanism for conveying the media with images formed thereon to the image input unit 9, and a conveying mechanism for conveying the media whose images have been read by the image input unit 9 to the paper discharge tray, the classification mechanism, and the like.

[0023] The paper feed unit 11 conveys the medium along the sub-scanning direction of the image input unit 9. In the present application, as described above, the width of the paper in the direction orthogonal to the conveying direction of the medium (paper) is referred to as the paper width. Therefore, in the present embodiment, the paper width may also be referred to as the width of the paper in the main scanning direction of the image input unit 9. The paper feed unit 11 conveys the medium in such a manner that the length direction of the fixing belt (not shown) of the fixing unit 15 and the conveying direction of the medium are orthogonal to each other.

[0024] The image forming unit 13 forms (prints) an image on a medium such as copy paper based on the image data. The printing method of the image forming unit 13 is a laser printer. The image forming unit 13 can be either a monochrome laser printer or a color laser printer. The image forming unit 13 can also have a paper feeding mechanism for feeding the medium, a conveying mechanism for conveying the medium, a classification mechanism for classifying the medium after the image is formed, etc. The fixing unit 15 is a fixing device that heats and pressurizes the colorant image transferred to the paper to fuse the colorant image to the paper. The temperature sensor 17 (temperature measuring unit) is a sensor that measures the temperature of the fixing unit 15. The temperature sensor 17 converts the temperature of the fixing unit 15 into a physical quantity such as a voltage or a resistance value and outputs it.

[0025] The cooling section 18 is a device that is responsible for cooling the fixing unit 15. The cooling section 18 can directly lower the temperature of the fixing unit 15, or can indirectly lower the temperature of the fixing unit 15 by lowering the temperature of the air inside the housing of the image forming device 1. The cooling principle of the cooling section 18 is not particularly limited. For example, it can be air cooling or water cooling. It can be a heat pump that uses a reverse Carnot cycle like a refrigerator or an air conditioner, or it can be a heat pump that uses semiconductors such as Peltier elements. Specifically, the cooling section 18 is, for example, an electric fan that exhausts the air inside the housing of the image forming device 1 to the outside of the housing. Figure 1 In the figure, the cooling section 18 is shown as a part of the image forming section 13, but it may be provided outside the image forming section 13 as long as it can cool the fixing unit 15. In addition, it may be configured such that when the image forming apparatus 1 is normally operated, the electric fan that mainly exhausts air for the purpose of lowering the temperature of the control section 29 is operated at a higher rotation speed than usual, so that the cooling section 18 as the fixing unit 15 is also operated.

[0026] The communication unit 19 is a functional unit for connecting to a network. The communication unit 19 is composed of an interface that can connect to a wired LAN (Local Area Network) or a wireless LAN or LTE (Long Term Evolution) network, for example. The communication unit 19 is connected to the network, and thus connected to other devices and an external network.

[0027] The connection unit 21 connects the image forming apparatus 1 to other devices. For example, the connection unit 21 is a USB interface and is connected to a USB memory or the like. In addition, the connection unit 21 may also be configured to include a device (such as an antenna, etc.) for performing short-range wireless communication, such as NFC (Near field communication) or Bluetooth (registered trademark).

[0028] In addition, the communication unit 19 and the connection unit 21 may be integrally configured. For example, as an interface for wireless communication, a wireless LAN or Bluetooth may be used.

[0029] The storage unit 23 is a functional unit that stores various programs and various data required for the operation of the image forming apparatus 1. The storage unit 23 includes a recording device capable of temporarily storing DRAM (Dynamic Random Access Memory) and the like, and a non-temporary recording device such as an SSD (Solid State Drive) composed of a semiconductor memory and an HDD (Hard Disk Drive) composed of a magnetic disk. In addition, the storage unit 23 is configured as one for the sake of convenience, but it can also be configured as a device that serves different purposes, such as an area used for program execution (main storage area), an area for storing programs and data (auxiliary storage area), and an area used for cache.

[0030] The installation unit type storage unit 25 stores the type (unit type) of the fixing unit 15 currently installed in the image forming device 1. The unit type corresponds to the type of paper on which the image is fixed using the fixing unit. The type of paper is, for example, any one of the paper width, the material, thickness, shape (envelope), etc., or a combination thereof. The types of paper based on the paper width include, for example, the long side of A3 size (420 mm), the short side of A3 size and the long side of A4 size (297 mm), the short side of A4 size and the long side of A5 size (210 mm), etc. Similarly, there are the long side of B3 size (515 mm), the short side of B3 size and the long side of B4 size (364 mm), the short side of B4 size and the long side of B5 size (257 mm), etc.

[0031] The setting information storage unit 27 for each unit type stores setting information of the image forming device 1 determined for each unit type. The setting information for each unit type includes, for example, gram weight setting, paper type, paper attribute, fixing temperature setting, fixing pressure setting, primary transfer current value setting, secondary transfer current value setting, and PTC (Pre Transfer Charger) current value setting. The gram weight setting refers to the setting of the weight per square meter of each sheet of paper. The paper type refers to the setting of the type of paper, for example, uncoated paper, glossy paper, matte paper, embossed paper, etc. The paper attribute refers to the setting of the attribute of the paper, for example, the front and back of the paper, non-double-sided printing, etc. The fixing temperature setting is the setting of the temperature emitted by the fixing unit 15 when fixing the colorant image. The fixing pressure setting is the setting of the intensity of the pressure applied to the paper by the fixing unit 15 when fixing the toner image. The primary transfer current value setting is the setting of the current magnitude for attaching the toner to the intermediate transfer belt of the fixing unit 15, and is set for each color of black (Bk), cyan (C), magenta (M), and yellow (Y). The secondary transfer current value setting is the setting of the current magnitude for attaching the toner formed on the intermediate transfer belt to the paper, and is set for the front and back of the paper. The PTC current value setting is the setting of the current magnitude for giving a charge to the transferred toner.

[0032] The control unit 29 is a functional unit for controlling the entire image forming apparatus 1. The control unit 29 is composed of one or more control devices and control circuits, such as a CPU (Central Processing Unit) and a SoC (System on a Chip).

[0033] Furthermore, the control unit 29 can realize each function by reading out a program stored in the storage unit 23 and executing the program.

[0034] The cooling time estimation unit 31 estimates the time required for the temperature of the fixing unit 15 to drop to a level that allows the fixing unit 15 to be removed from the image forming unit 13 based on the current temperature of the fixing unit 15 measured by the temperature sensor 17 .

[0035] The temperature monitoring section 33 monitors the current temperature of the fixing unit 15 measured by the temperature sensor 17 in real time.

[0036] 1.2 Operation of Image Forming Apparatus 1 in Embodiment Figure 2This is a flowchart for explaining the operation of the image forming apparatus 1 when replacing the fixing unit 15. The image forming apparatus 1 can install three types of fixing units (unit types A, B, and C) as the fixing unit 15 on the image forming section 13. Unit type A is a fixing unit for A4 / A3 size. Unit type B is a fixing unit for B5 / B4 size. Unit type C is a fixing unit for envelope size. Here, the case where the unit type A installed in the image forming section 13 is replaced with the unit type B is described as an example.

[0037] The control unit 29 displays the home screen on the display unit 3 (step S1). Then, the control unit 29 displays the machine adjustment screen on the display unit 3 (step S3). Then, the control unit 29 displays the image quality adjustment screen on the display unit 3 (step S5). Then, the control unit 29 displays other function screens on the display unit 3 (step S7). Then, the control unit 29 displays the fuser type display screen before replacement on the display unit 3 (step S9). Then, the control unit 29 displays the precautions confirmation screen on the display unit 3 (step S11). Then, the control unit 29 displays the replacement preparation start screen on the display unit 3 (step S13). Then, the control unit 29 displays the fuser type designation request screen on the display unit 3 (step S15). Then, in order to confirm with the user whether the replacement preparation of the fuser unit can be started, the control unit 29 displays the replacement confirmation screen on the display unit 3 (step S17).

[0038] When an input indicating that preparations for replacement can be started is received via the operating unit 5 in the replacement confirmation screen (step S19, yes), the control unit 29 displays a cooling screen on the display unit 3 indicating that the temperature of the currently installed fixing unit 15 is waiting to drop to a specified value, and starts a cooling operation to cool the fixing unit 15 (step S21).

[0039] During the cooling operation of the fixing unit 15, the control unit 29 stops the supply of power to the fixing unit 15. In addition, during the cooling operation, the control unit 29 operates the cooling unit 18 to promote the temperature reduction of the fixing unit 15.

[0040] At the same time as the cooling action starts, the temperature monitoring unit 33 of the control unit 29 uses the temperature sensor 17 to measure the temperature of the fixing unit 15 or its vicinity (step S23). Thereafter, the temperature monitoring unit 33 uses the temperature sensor 17 to monitor the temperature of the fixing unit 15 until the cooling action is completed. Based on the measurement result of the temperature sensor 17, the cooling time estimation unit 31 of the control unit 29 generates prediction information related to the cooling time (step S25). The prediction information is, for example, the time required for the temperature of the fixing unit 15 to drop to a specified end temperature. In addition, the prediction information is, for example, the time when the fixing unit 15 is predicted to drop to the end temperature (estimated end time). The end temperature is a temperature predetermined as a temperature at which a user will not be burned even if he directly touches the fixing unit 15, for example, about 40 degrees.

[0041] Next, the control unit 29 displays the prediction information on the display unit 3 (step S27). At this time, a message indicating that the cooling process is in progress may also be displayed. By viewing the displayed prediction information, the user can know in advance when the cooling operation will end. Therefore, the user can leave the image forming device 1 until the moment when the prediction information prompts. In addition, by returning to the image forming device 1 before the moment when the prediction information prompts and continuing the operation, the user can remove the loaded fixing unit 15 from the image forming unit 13 without delay and install another fixing unit after the loaded fixing unit 15 reaches a replaceable temperature. As a result, the time required for the entire replacement operation of the fixing unit 15 including the cooling operation can be minimized.

[0042] Next, when the temperature monitored by the temperature monitoring unit 33 reaches the end temperature, the control unit 29 ends the cooling operation (step S29) and displays the preparation completion screen on the display unit 3 (step S31). By visually viewing the preparation completion screen, the user can confirm that the fixing unit 15 has actually reached the end temperature.

[0043] 1.3 Screen Examples of Image Forming Apparatus 1 in Embodiment The following describes an example of a screen displayed on the display unit 3 when replacing the fixing unit 15. Here, the display unit 3 and the operation unit 5 are integrally configured as a touch panel display.

[0044] Figure 3 1 is a diagram showing an example of a home screen displayed on the display unit 3 of the image forming apparatus 1 when the fixing unit 15 is replaced in the embodiment of the present disclosure. The home screen 51 is a screen displayed on the display unit 3 by the control unit 29 after the main power of the image forming apparatus 1 is turned on from the state where the main power is turned off. The home screen 51 includes a machine adjustment button 53. The control unit 29 displays the home screen 51 on the display unit 3, for example, in step S1. When the user touches the machine adjustment button 53, the control unit 29 displays a machine adjustment screen 55 described next.

[0045] Figure 4 1 is a diagram showing an example of a machine adjustment screen displayed on the display unit 3 of the image forming apparatus 1 when the fixing unit 15 is replaced in the embodiment of the present disclosure. In step S1, when the main screen 51 is displayed on the display unit 3, when the user touches the machine adjustment button 53, the control unit 29 proceeds to step S3 and displays the machine adjustment screen 55 on the display unit 3. The machine adjustment screen 55 is a menu screen related to various adjustment operations of the image forming apparatus 1. The machine adjustment screen 55 includes an image quality adjustment button 57. The image quality adjustment button 57 is an area that is touched when entering the image quality adjustment screen described next.

[0046] Figure 5 1 is a diagram showing an example of an image quality adjustment screen displayed on the display unit 3 of the image forming apparatus 1 when the fixing unit 15 is replaced in the embodiment of the present disclosure. In step S3, when the machine adjustment screen 55 is displayed on the display unit 3, if the user touches the image quality adjustment button 57, the control unit 29 proceeds to step S5 and displays the image quality adjustment screen 61 on the display unit 3. The image quality adjustment screen 61 is a menu screen related to the image quality adjustment of the image formed on the paper by the image forming unit 13. The image quality adjustment screen 61 includes other function buttons 63. The other function buttons 63 are areas that are touched when entering the other function screen 67 described below.

[0047] Figure 6 1 is a diagram showing an example of an other function screen displayed on the display unit 3 of the image forming apparatus 1 when the fixing unit 15 is replaced according to an embodiment of the present disclosure. In step S5, when the image quality adjustment screen 61 is displayed on the display unit 3, when the user touches the other function button 63, the control unit 29 proceeds to step S7 to display the other function screen 67 on the display unit 3. The other function screen 67 is a menu screen related to the image quality adjustment of the image formed on the paper by the image forming unit 13. The other function screen 67 includes a fixing unit replacement button 69. The fixing unit replacement button 69 is an area that is touched when advancing to the fixing device type display screen 73 described next.

[0048] Figure 7 1 is a diagram showing an example of a fuser type display screen displayed on the display unit 3 of the image forming apparatus 1 when replacing the fuser unit 15 in the embodiment of the present disclosure. In step S7, when the user touches the fuser unit replacement button 69 while the other function screen 67 is displayed on the display unit 3, the control unit 29 proceeds to step S9 and displays the fuser type display screen 73 on the display unit 3.

[0049] The fuser type display screen 73 is a screen that displays the unit type of the fuser unit 15 currently mounted on the image forming apparatus 1. The fuser type display screen 73 includes a unit type list 75. In the unit type list 75, unit types A 75a, B 75b, and C 75c are displayed.

[0050] Among these unit types, the control unit 29 displays the unit type of the currently installed fixing unit 15 in a selected state on the display unit 3 (for example, reverse display, emphasized display) based on the unit type stored in the installed unit type storage unit 25. As described above, the fixing unit 15 currently installed in the image forming apparatus 1 is unit type A, so the unit type A75a is displayed in a selected state. For example, when the user performs the initial setting of the image forming apparatus 1, the unit type stored in the installed unit type storage unit 25 is registered through the operation unit 5. Thereafter, the unit type stored in the installed unit type storage unit 25 is updated by the unit type specified in the fixing unit type specification request screen of step S11 described later.

[0051] By displaying the unit type of the currently mounted fixing unit 15 in this way, the user can easily recognize which unit type the currently mounted fixing unit 15 is. In addition, this can prevent the fixing unit 15 from being mistakenly replaced with another unit type.

[0052] If it is determined that the unit type of the fixing unit 15 does not need to be changed at the time of this confirmation, the user can touch the return button 79 to cancel the replacement of the fixing unit. If the fixing unit is to be replaced after confirmation, the user then touches the button 77. If the button 77 is touched next, the control unit 29 proceeds to step S7.

[0053] Figure 8 1 is a diagram showing an example of a precaution confirmation screen displayed on the display unit 3 of the image forming apparatus 1 when replacing the fixing unit 15 in the embodiment of the present disclosure. In step S9, when the fixing unit type display screen 73 is displayed on the display unit 3, if the user touches the button 77 next time, the control unit 29 proceeds to step S10 and displays the precaution confirmation screen 80 on the display unit 3.

[0054] The precaution confirmation screen 80 is a screen for notifying the user who performs the replacement operation of the fixing unit 15 of various precautions related to the replacement operation before the replacement operation, and requesting the user to confirm the contents of the notification. The precaution confirmation screen 80 includes a precaution display column 80a, a statement display column 80b, a check box 80c, a return button 80d, a next button 80e, and a scroll bar 80f.

[0055] The precaution display column 80a displays a message sent to the user who performs the replacement operation. The message in the precaution display column 80a may be a message listing precautions related to the replacement operation. Together with or in place of such a message, the message in the precaution display column 80a may also be a message that informs the user who performs the replacement operation that there is a risk of injury, burns, etc. In addition, the precaution display column 80a may not display the entire message at once. The message displayed by the precaution display column 80a scrolls up and down in response to the operation of the scroll bar 80f via the operating unit 5. In the precaution display column 80a, the entire message can be read by scrolling.

[0056] In the statement display column 80b, a message is recorded for the user who is performing the replacement operation to indicate that the user has received sufficient training on the appropriate handling method of the fixing unit before the replacement operation and understands the risks associated with the replacement operation. When the user agrees with the message in the statement display column 80b, the user checks the check box 80c via the operation unit 5. In the precaution confirmation screen 80, the check box 80c is not checked. When the check box 80c is not checked, the next button 80e is displayed in gray. The gray display indicates that the next button 80e is currently in a state where it cannot be selected.

[0057] The scroll bar 80f includes an up arrow button 80g, a down arrow button 80h, and a slider 80i. The scroll bar 80f is operated by the user via the operation unit 5 to scroll the messages displayed in the precaution display column 80a. When the up arrow button 80g is touched via the operation unit 5, the messages displayed in the precaution display column 80a are scrolled upward. Similarly, when the down arrow button 80h is touched, the messages are scrolled downward. Instead of touching the up arrow button 80g or the down arrow button 80h, the messages displayed in the precaution display column 80a can be scrolled up and down by moving the slider 80i up and down via the operation unit 5.

[0058] In the precaution confirmation screen 80, if the operation of checking the check box 80c is performed through the operation unit 5, the control unit 29 switches the screen displayed on the display unit 3 from the precaution confirmation screen 80 to the screen displayed on the display unit 3. Fig. 9 The precautions confirmation screen 80-2 is shown in the figure. Fig. 9This is another example of the precaution confirmation screen displayed on the display unit 3 of the image forming apparatus 1 when the fixing unit 15 is replaced in the embodiment of the present disclosure. In the precaution confirmation screen 80, the check box 80c that was originally blank is checked, and the check box 80c-2 is changed to a checked check box in the precaution confirmation screen 80-2. In addition, in response to the checked check box 80c-2, the next button 80e displayed in gray in the precaution confirmation screen 80 is changed to a normal display state like the next button 80e-2 in the precaution confirmation screen 80-2, indicating that it is in a selectable state.

[0059] Fig.10 1 is a diagram showing an example of a replacement preparation start screen displayed on the display unit 3 of the image forming apparatus 1 when replacing the fixing unit in the embodiment of the present disclosure. In step S13, the control unit 29 displays the replacement preparation start screen 81 on the display unit 3. The replacement preparation start screen 81 includes messages 83, 85, 87, a return button 89, a two-dimensional barcode 91, and a next button 93.

[0060] Message 83 is a message for notifying the user that preparations are required before replacing the fixing unit. The preparations include the cooling operation described above.

[0061] Message 85 is a message for informing the user that the fixing unit 15 will become hot. In particular, the fixing component of the fixing unit 15 is hot (e.g., 160 to 180 degrees) immediately after the image forming apparatus 1 outputs the medium on which the image is formed. Message 85 prompts the user to be careful not to directly touch the fixing unit 15 at such a high temperature.

[0062] Message 87 notifies the user of information for accessing the manual for the replacement operation. Message 87 records address information of the manual data that can be downloaded by a device other than the image forming apparatus 1. Specifically, the device other than the image forming apparatus 1 is, for example, a smartphone, a tablet, a personal computer, etc. (hereinafter referred to as a user terminal) of a user who performs the replacement operation of the fixing unit. By reading the program on the user terminal and operating it, even a user who has no knowledge of the fixing unit or the replacement procedure can safely perform the replacement operation.

[0063] Usually, the current state of the image forming device 1, commands that can be instructed or set for the image forming device 1 in real time, various numerical values, etc. are displayed on the display unit 3 of the image forming device 1. Since the display size of the display unit 3 is limited, it is difficult to display these displays and the manual at the same time. Although it is also considered to switch these displays and the manual display as needed, in this case, the operation is likely to become complicated. Such a problem can be avoided by displaying the manual on the user terminal.

[0064] As will be described later, the replacement operation of the fixing unit includes a process of turning on and off the main power of the image forming apparatus 1. Therefore, if the manual is displayed on the display unit 3 of the image forming apparatus 1, there will be a time during the operation when the manual cannot be checked. However, the user who has read the message 87 can download the manual to the user terminal, and can check the manual regardless of the on / off state of the power of the image forming apparatus 1.

[0065] Message 87 records a URL (Uniform Resource Locator) on the Internet as address information, but the address information recorded here is not limited to the address information of resources on the Internet, as long as it is the address information of resources that can be accessed by the user terminal and can download the data of the manual. For example, when the user terminal and the image forming device 1 can both be connected to the same LAN (Local Area Network), the manual can be stored in the storage unit 23 of the image forming device 1, and the control unit 29 acts as a file server to provide the manual data to the user terminal via the LAN. In addition, by setting a Bluetooth communication function in the communication unit 19 and / or the connection unit 21, and sharing files with a user terminal that also has a Bluetooth communication function, the user terminal can download the manual data from the image forming device 1 via the Bluetooth communication function.

[0066] Alternatively, the manual may be displayed on display unit 3 of image forming apparatus 1 instead of on the user terminal. In this case, as described above, the manual cannot be viewed while the main power of image forming apparatus 1 is turned on and off, but there is no need to prepare a separate user terminal.

[0067] The two-dimensional barcode 91 displays the address information of the specification data as a two-dimensional barcode. The address information represented by the two-dimensional barcode 91 may be the same address as the address information recorded in the message 87 or another address.

[0068] When the user touches the return button 89, the control unit 29 displays the fuser type display screen 73 on the display unit 3. When the user touches the next button 93, the control unit 29 proceeds to the next step S15.

[0069] Fig.11 1 is a diagram showing an example of a fuser type designation request screen displayed on the display unit 3 of the image forming apparatus 1 when replacing the fuser unit 15 in the embodiment of the present disclosure. The fuser type designation request screen 103 is a state after the user touches and selects the unit type B107b. Therefore, the unit type B107b is displayed in a selected state in the fuser type designation request screen 103.

[0070] When the user touches the button 111 in the next step on the fuser type specification request screen 103, the control unit 29 selects the unit type that is currently selected, i.e., the unit type B, and proceeds to the next step S17. In addition, at this time, the control unit 29 updates the unit type stored in the installation unit type storage unit 25 with the selected unit type. When the next button 111 is touched on the fuser type specification request screen 103, the control unit 29 updates the unit type stored in the installation unit type storage unit 25 to the unit type B.

[0071] By requesting the user to input the unit type of the replaced fixing unit as in the fixing unit type designation request screen 103 , it is possible to prevent the fixing unit from being replaced by another unit type by mistake.

[0072] Fig.12 1 is a diagram showing an example of a replacement confirmation screen displayed on the display unit 3 of the image forming device 1 when replacing the fixing unit 15 in an embodiment of the present disclosure. The replacement confirmation screen 113 has a message area 115. In the message area 115, a message 115a is displayed to confirm to the user that preparations for replacing the fixing unit 15 have been entered. In addition, the message area 115 has an OK button 115b and a Cancel button 115c. When the OK button 115b is touched (step S19, yes), the control unit 29 proceeds to step S21 and starts a cooling operation. When the Cancel button 115c is touched (step S19, no), the control unit 29 terminates (ends) the process.

[0073] Fig.13 1 is a diagram showing an example of a cooling screen displayed on the display unit 3 of the image forming apparatus 1 when the fixing unit 15 is replaced in the embodiment of the present disclosure. In step S21, the control unit 29 starts the cooling operation, and measures the temperature of the fixing unit 15 by the temperature sensor 17 through the temperature monitoring unit 33 (step S23), generates prediction information based on the measurement result (step S25), and displays the cooling screen 121 on the display unit 3 (step S27).

[0074] The cooling screen 121 includes a message area 123. The message area 123 displays a message 123a notifying the user until the temperature of the fixing unit 15 drops, prediction information 123b, and a stop button 125.

[0075] The required time and the scheduled end time are recorded in the prediction information 123b. The time "60 minutes" recorded as the required time is a value measured by the temperature sensor 17 and calculated by the cooling time estimation unit 31 of the control unit 29 based on the current temperature of the fixing unit 15. The time "11:52" recorded as the scheduled end time indicates the time after the required time has passed from the current time. By observing the required time, the user can understand the required time for the cooling operation. In addition, by observing the estimated end time, the user can understand when the replacement operation of the fixing unit after the cooling operation is completed can be performed.

[0076] After step S23, the temperature monitoring unit 33 also uses the temperature sensor 17 to periodically measure the temperature of the fixing unit 15 and compares it with the end temperature. If the stop button 125 is not touched and the temperature of the fixing unit 15 reaches or falls below the end temperature, the control unit 29 ends the cooling operation (step S29) and proceeds to step S31.

[0077] Fig.14 1 is a diagram showing an example of a preparation completion screen displayed on the display unit 3 of the image forming apparatus 1 when replacing the fixing unit 15 in the embodiment of the present disclosure. The control unit 29 displays the preparation completion screen 145 in step S31. The preparation completion screen 145 includes messages 147, 85, 87, a cancel button 151, a two-dimensional barcode 91, and a replacement start button 153.

[0078] The message 147 includes a message notifying the user that the temperature of the fixing unit 15 has reached the end temperature and that the replacement operation can be performed. In addition, the message 147 includes a message notifying the user that the power of the operation panel (display unit 3 and operation unit 5) is turned off and the image forming apparatus 1 is transferred to the standby state when the replacement start button 153 is touched. In addition, the message 147 includes a message instructing the user to turn off the main power switch 7 after the image forming apparatus 1 is transferred to the standby state to turn off the power of the image forming apparatus 1.

[0079] The cancel button 151 is a button for instructing the image forming apparatus 1 to stop replacing the fixing unit 15 .

[0080] The replacement start button 153 is a button for finally instructing the image forming apparatus 1 to replace the fixing unit 15. Fig.10 The description has been given, so the description is omitted here.

[0081] When the preparation completion screen 145 is displayed and the replacement start button 153 is touched, the power of the operation panel is turned off. Then, the user turns off the main power switch 7 of the image forming apparatus 1, removes the fixing unit 15 of the unit type A from the image forming section 13, and installs the fixing unit of the unit type B to the image forming section 13. After the installation, the image formation using the fixing unit of the unit type B can be performed by turning on the main power switch 7.

[0082] 1.4 Effects of implementation methods According to the embodiment, the following effects can be obtained.

[0083] In step S9 , since the fixing unit type display screen 73 is displayed, the user can confirm the unit type of the currently mounted fixing unit 15 before replacement.

[0084] In step S15, the fuser type designation request screen 103 is displayed to request the user to input the unit type, thereby prompting the user to reliably identify the unit type after replacement. In addition, this can prevent the fuser unit 15 from being replaced with an incorrect unit type.

[0085] In step S13, information for accessing the manual of the replacement operation is notified to the user as a message 87 of the replacement preparation start screen 81, so that the user can perform the replacement operation of the fixing unit 15 while viewing the user terminal. Therefore, even a user who does not have detailed knowledge about the structure of the image forming apparatus 1 and the replacement operation of the fixing unit 15 can safely perform the replacement operation. In addition, since the manual can be viewed using the user terminal, the user can view the manual regardless of whether the power of the image forming apparatus 1 is turned on or off.

[0086] In step S27, the time required until the cooling operation of cooling the fixing unit 15 is completed and the estimated end time are displayed. The user who sees this can understand the time when the fixing unit is touched after the cooling operation is completed. Therefore, the user can leave the image forming device 1 and perform other operations after the cooling operation starts until the estimated end time. In addition, if the image forming device 1 is returned to its original state before the estimated end time, there will be no delay after the cooling operation is completed, and the user can remove the fixing unit 15 being installed from the image forming unit 13 and replace it with another fixing unit.

[0087] 1.5 Variations of Implementation Methods 1.5.1 Deformation 1 In the above-described embodiment, in steps S21 to S25 , the prediction information generated together with the start of the cooling operation is displayed without being updated until the cooling operation is completed in step S29 .

[0088] In this variation, after the replacement confirmation screen 113 is displayed, the estimated end time is updated according to the passage of time. For example, the display may be displayed immediately after the cooling operation starts. Fig.15 After the replacement confirmation screen 113 is displayed, the temperature monitoring section 33 measures the temperature of the fixing unit 15 every one minute, generates an estimated end time, and updates the value of the estimated end time on the replacement confirmation screen 113 . Fig.16 It is showing Fig.15 The replacement confirmation screen 113 is displayed 5 minutes after the replacement confirmation screen 113. As can be seen by comparing the estimated end times, Fig.16 The estimated end time of "15:45" is updated to Fig.15 The time 5 minutes after the estimated end time "15:40". According to this variation, a more accurate estimated end time can be displayed.

[0089] 1.5.2 Transformation 2 This variation converts the Fig.13 The cooling screen 121 is replaced by Fig.17 Cooling screen 121. Fig.13 In the embodiment, the prediction information 123b is displayed as text information in the message area 123. In contrast, in the present variation, Fig.17 That is, after the control unit 29 obtains the required time in the same manner as in the above-mentioned embodiment, it periodically calculates the progress of the cooling operation and displays it as a progress bar 123c on the display unit 3. The progress is calculated by obtaining the elapsed time from the start of the cooling operation and obtaining the ratio of the elapsed time to the required time as a percentage. According to this variation, the progress of the cooling operation can be displayed substantially in real time.

[0090] 1.5.3 Transformation 3 In this variation, when the required time changes according to the change of environmental conditions, the prediction information of the cooling screen is updated. The environmental conditions are conditions related to the environment in which the image forming device 1 is configured, in particular, the temperature around the image forming device 1. In the above-mentioned embodiment, the prediction information is generated on the premise that the image forming device 1 is used while maintaining a general office environment. Therefore, when the image forming device 1 is set in an extremely hot place or a cold place, the prediction information may deviate from the actual process. In addition, when the cover of the image forming device 1 is opened to deliver cold air, the time taken to complete the cooling is shortened.

[0091] In the case where the configuration of the cooling unit 18 is simple, for example, when the main purpose is to exhaust only the air inside the housing of the image forming apparatus 1, the fixing unit 15 waits for the temperature to naturally drop by the heat dissipation of the surroundings. At this time, the time required until the temperature of the fixing unit 15 drops to the end temperature is affected by the temperature difference between the temperature of the surroundings of the image forming apparatus 1 and the temperature of the fixing unit 15.

[0092] Therefore, when generating the prediction information in step S25, the temperature monitoring unit 33 calculates the predicted temperature of the fixing unit 15 at a predetermined elapsed time (for example, every 1 minute after the start of the cooling operation) in addition to the above-mentioned prediction information, and stores it in the storage unit 23. Then, during the cooling operation, the temperature monitoring unit 33 measures the temperature of the fixing unit 15 using the temperature sensor 17 at every predetermined elapsed time, and calculates the difference between the predicted temperature at that time and the temperature stored in the storage unit 23. The calculated difference is compared with the threshold value, and when the difference exceeds the threshold value, the temperature monitoring unit 33 executes steps S25 and S27 again to update the prediction information.

[0093] In this variation, the display is displayed immediately after the cooling action starts. Fig.11 After the cooling screen 121 is displayed, time has passed, and after the environmental conditions have changed, both the required time and the estimated end time are updated. An example of the updated cooling screen 121 is shown in Fig.18 In. With Fig.13 Compared with the prediction information 123b, Fig.18 According to the forecast information 123d, the required time is shortened from 60 minutes to 45 minutes. At the same time, the estimated end time is changed from 11:52 to 11:37, which is also shortened by 15 minutes. According to this variation, prediction information can be updated according to changes in environmental conditions.

[0094] 1.5.4 Transformation 4 In this variation, before the cooling operation begins, Fig.12 The replacement confirmation screen 113 shows Fig.19 The replacement confirmation screen 113. Fig.19 The required time and the scheduled start time are displayed on the replacement confirmation screen 113.

[0095] In addition, in this variation, after the cooling operation starts, Fig.13 The cooling screen 121 shows Fig. 20 The cooling screen is 121. Fig. 20 The required time and the estimated end time are displayed in the cooling screen 121.

[0096] The current time is used as the scheduled start time. Preferably, the scheduled start time is updated in real time. The estimated end time is based on the Fig.19 The calculation is based on the time when the OK button 115b is touched on the replacement confirmation screen 113, so it cannot be calculated at the time before the OK button 115b is touched. Fig.19 The current time is displayed as shown, and auxiliary information on the estimated end time can be provided to the user even at a point in time before the OK button 115b is touched.

[0097] 1.5.5 Transformation 5 In the present variation, the start time of the replacement operation is set in the image forming apparatus 1, and the process shifts to the cooling operation after the set start time.

[0098] In step S13 of the above embodiment, instead of Fig.12 The replacement confirmation screen 113 shows Fig.21 The start time setting screen 401 is displayed. When the OK button 407 is touched while the check box 405 is not checked, the steps after step S19 are performed in the same manner as in the embodiment.

[0099] When the OK button 407 is touched with the check box 405 checked, the image forming apparatus 1 is set to start the replacement job of the fixing unit 15 at the start time set in the time setting 403. Thereafter, the user can use the image forming apparatus 1 to execute jobs other than the replacement job until the start time. Fig. 22 The screen 411 is an example of a screen related to functions that can be executed by the image forming apparatus 1 from the time the start time is set to the time the start time is reached. Fig.23 As shown, a message area 415 is displayed superimposed on a screen 413 related to a function currently being used by the user. The message area 415 displays a message notifying the user that the function of the image forming apparatus 1 cannot be used in the preparation work and that the fixing unit replacement operation is scheduled.

[0100] If in Fig.23 Touch the start button 415a on the screen 413 to start the cooling operation. Fig.24 The cooling screen 121 is displayed. Then, the process proceeds to steps S29 and S31 as in the embodiment. Fig.23 When the cancel button 415b is touched in the screen 413, the set replacement job is canceled.

[0101] According to this variation, the user can reserve a replacement job for the fixing unit in the image forming apparatus 1 .

[0102] 1.5.6 Transformation 6 In the above embodiment, in step S27, Fig.13 In the present variation, instead of Fig.13The cooling screen 121 shows Fig.25 Cooling screen 121.

[0103] and Fig.13 The cooling screen 121 is compared with the Fig.25 In the cooling screen 121, the prediction information 123g is displayed instead of the prediction information 123b. The prediction information 123g is different from the prediction information 123b in that the current time is included.

[0104] The current time included in the prediction information 123g is the current time indicated by the timer referenced when the image forming apparatus 1 generates the time information. The current time may be generated by a circuit included in the image forming apparatus 1 itself, or may be time information obtained from a Network Time Protocol (NTP) server using NTP.

[0105] By displaying the current time based on the time information of the image forming device 1 as the prediction information 123g, the user can understand the deviation between the time of the timer (such as a watch, a smart phone, etc.) carried by the user and the time based on the image forming device 1. Therefore, even if there is a deviation between the time referenced by the image forming device 1 and the time referenced by the user, the user can accurately know the time when the cooling action ends.

[0106] 1.5.7 Other variations The present disclosure is not limited to the above-mentioned embodiments, and various modifications are possible. That is, embodiments obtained by appropriately changing and combining technical means without departing from the scope of the present disclosure are also included in the technical scope of the present disclosure.

[0107] The programs running in the various devices of the embodiments are programs that control the CPU and the like (programs that enable the computer to function) to realize the functions of the above-mentioned embodiments. In addition, the information processed by these devices is temporarily stored in a temporary storage device (e.g., RAM) while being processed, and is then stored in various storage devices such as ROM (Read Only Memory) and HDD, and is read, modified, and written by the CPU as needed.

[0108] Here, the storage medium for storing the program may be any one of a semiconductor medium (e.g., ROM, nonvolatile memory card, etc.), an optical recording medium / magneto-optical recording medium (e.g., DVD (Digital Versatile Disc), MO (Magneto Optical Disc), MD (Mini Disc), CD (Compact Disc), BD (Blu-ray (registered trademark) Disk), etc.), a magnetic recording medium (e.g., a magnetic tape, a floppy disk, etc.). In addition, by executing the downloaded program, not only the functions of the above-mentioned embodiments can be realized, but also the functions of the present invention can be realized through joint processing by an operating system or other application programs based on the instructions of the program.

[0109] In addition, when the program is distributed to the market, it can be stored in a portable recording medium and processed, or transmitted to a server computer via a network such as the Internet. In this case, the storage device of the server computer is of course also included in the present disclosure.

Claims

1. An image forming device, characterized in that: include: a control unit, a display unit, a detachable fixing unit, and a temperature measuring unit for measuring the temperature of the fixing unit or the temperature in the vicinity thereof. The control unit displays prediction information on the display unit based on the measurement result of the temperature measurement unit, the prediction information being prediction information on the completion of a cooling operation of the fixing unit in the cooling mode.

2. The image forming apparatus according to claim 1, wherein: The prediction information includes a time required for the temperature of the loaded fixing unit to drop to a predetermined temperature.

3. The image forming apparatus according to claim 1 or 2, characterized in that: The prediction information includes an estimated end time predicted as a time when the temperature of the fixing unit being loaded is reduced to a predetermined temperature.

4. The image forming apparatus according to claim 1 or 2, wherein: The control unit repeatedly performs measurement by the temperature measuring unit, and displays the prediction information updated according to the measurement result on the display unit.

5. The image forming apparatus according to claim 1 or 2, wherein: The control unit displays the prediction information on the display unit before starting the cooling operation.

6. The image forming apparatus according to claim 5, wherein: Before the cooling operation starts, the control unit displays the current time or the scheduled start time, which is the time to start the cooling operation, on the display unit together with the forecast information.

7. The image forming apparatus according to claim 6, wherein: After the cooling operation starts, the control unit displays on the display unit an estimated end time that is predicted as a time when the temperature of the mounted fixing unit drops to a predetermined temperature.

8. The image forming apparatus according to claim 5, wherein: Before the cooling operation starts, the control unit displays the prediction information on the display unit and displays an input screen for receiving an input of a scheduled start time, which is a time scheduled to start the cooling operation, on the display unit.

9. The image forming apparatus according to claim 1 or 2, characterized in that: The control unit further displays the current time on the display unit.

10. The image forming apparatus according to claim 1 or 2, wherein: The control unit displays a graph indicating a progress of the cooling operation based on the prediction information and a current time on the display unit.

11. An operating method of an image forming apparatus, the image forming apparatus having a detachable fixing unit, characterized in that: include: a step of measuring the temperature of the fixing unit or the temperature in the vicinity thereof; as well as A step of displaying prediction information on the completion of a cooling operation of the fixing unit in the cooling mode based on the measurement result.

Images