JP2010281942A - Image forming apparatus, method for deciding exchange time of roller in the same, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of exactly deciding time of maintenance, and to provide a method for deciding exchange time of a roller in the image forming apparatus and a program. <P>SOLUTION: A toner image is formed by supplying toner to a latent image formed on an image carrier, and transferred to transfer paper. The transfer paper is thermally fixed by a fixing roller and a pressing roller, and a surface of the fixing roller or the pressing roller is cleaned by a roller cleaning member. During image forming operation, a dot existing spot is defined in a grid pattern in a subscanning direction and a main scanning direction, density of pixels in the defined spot is calculated, and the exchange time of the roller cleaning member is decided, based on the calculated results and pixel density. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, and a facsimile, a method for determining a roller replacement time for the image forming apparatus, and a program.

Image forming apparatuses such as copiers, printers, and facsimile machines are frequently used in the workplace, for example, so that maintenance inspection is essential. In particular, the fixing roller and the pressure roller are one of the parts to be replaced.
Japanese Patent Application Laid-Open No. H10-228561 discloses a technique for displaying the replacement time of the fixing roller and the pressure roller.

  The invention described in Patent Document 1 relates to an image forming apparatus. This modeling apparatus includes a developing unit, a reflection density detecting unit, a transfer unit, a fixing roller and a pressure roller, an integrating unit, a replacement time determining unit, and a display unit for displaying.

  The developing means supplies toner to the latent image formed on the image carrier to form a toner image. The reflection density detecting means detects the reflection density of the toner image on the image carrier. The transfer unit transfers the toner image formed by the developing unit onto the transfer paper. The fixing roller and the pressure roller heat-fix the transfer paper to which the toner is attached by the transfer unit. The accumulating unit counts the number of sheets transferred by the transfer unit. The replacement time determination means obtains the replacement time of the fixing roller or the pressure roller based on the reflection density on the image carrier detected by the reflection density detection means and the integrated transfer number of sheets integrated by the integration means. When the replacement time determining means determines that the fixing roller or the pressure roller is to be replaced, the display means displays to that effect to the user.

  As a method for determining the replacement time of the fixing roller or the pressure roller, it has been proposed to use an integration unit that integrates the integrated value of the non-image area of the document according to the image area ratio of the document, and an integration result of the integration unit. .

  However, if the integrated value of the non-image area is simply calculated, the replacement time cannot be accurately determined, for example, when image formation is intensively performed only in a certain area.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image forming apparatus, a method for determining a roller replacement time for an image forming apparatus, and a program that can accurately determine the time for maintenance and inspection.

  In order to solve the above-mentioned problems, the invention described in claim 1 includes a developing unit that supplies toner to a latent image formed on an image carrier to form a toner image, and a toner image formed by the developing unit. A transfer means for transferring the toner onto the transfer paper, a fixing roller and a pressure roller for thermally fixing the transfer paper to which toner is adhered by the transfer means, a roller cleaning member for cleaning the surface of the fixing roller or the pressure roller, And calculating means for calculating a pixel density at a specific location in an image forming apparatus that specifies the location of dots in a grid pattern in the sub-scanning direction and the main scanning direction during an image forming operation, and And determining means for determining the replacement time of the roller cleaning member based on the calculation result and the pixel density.

  According to a second aspect of the present invention, there is provided developing means for supplying toner to a latent image formed on an image carrier to form a toner image, and transfer for transferring the toner image formed by the developing means onto a transfer sheet. Image forming operation, and a fixing roller and a pressure roller for thermally fixing the transfer paper to which toner is adhered by the transfer means, and a roller cleaning member for cleaning the surface of the fixing roller or the pressure roller. In an image forming apparatus that specifies a dot location in a grid pattern in the sub-scanning direction and the main scanning direction, a calculation unit that calculates a pixel density at a specific location, a calculation result by the calculation unit, and a pixel density And determining means for determining a replacement time of the fixing roller and the pressure roller.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the determining unit determines an operating speed of the roller cleaning member based on a calculation result by the calculating unit and a pixel density. To do.

  According to a fourth aspect of the present invention, in the first or second aspect of the invention, the determining means determines based on paper type information.

  The invention according to claim 5 is the invention according to claim 1 or 2, characterized in that the determining means determines based on a linear velocity.

  According to a sixth aspect of the present invention, in the first or second aspect of the present invention, the determining means determines based on a monochrome mode or a color mode.

  The invention described in claim 7 is characterized in that, in the invention described in claim 1 or 2, the replacement of parts is notified to the user by displaying on the panel.

  According to the eighth aspect of the present invention, toner is supplied to the latent image formed on the image carrier to form a toner image, the toner image is transferred onto a transfer sheet, and the transfer is performed by a fixing roller and a pressure roller. The paper is thermally fixed, the surface of the fixing roller or the pressure roller is cleaned with a roller cleaning member, and the location of dots is specified in a grid pattern in the sub-scanning direction and the main scanning direction during the image forming operation, The pixel density at a specific location is calculated, and the replacement time of the roller cleaning member is determined based on the calculation result and the pixel density.

  According to a ninth aspect of the present invention, toner is supplied to the latent image formed on the image carrier to form a toner image, the toner image is transferred onto a transfer sheet, and the transfer is performed by a fixing roller and a pressure roller. The paper is thermally fixed, the surface of the fixing roller or the pressure roller is cleaned with a roller cleaning member, and the location of dots is specified in a grid pattern in the sub-scanning direction and the main scanning direction during the image forming operation, The pixel density at a specific location is calculated, and the replacement timing of the fixing roller and the pressure roller is determined based on the calculation result and the pixel density.

  According to a tenth aspect of the present invention, there is provided a developing means for forming a toner image by supplying a toner to a latent image formed on an image carrier in order to determine a replacement time of the fixing roller and the pressure roller. A transfer unit that transfers the toner image formed by the developing unit onto a transfer paper; a fixing roller that thermally fixes the transfer paper to which the toner is adhered by the transfer unit; and a roller cleaning member that cleans the surface of the pressure roller. , Means for specifying the location of dots during the image forming operation in a grid pattern in the sub-scanning direction and the main scanning direction, calculation means for calculating the pixel density at the specific location, and calculation results and pixel density by the calculation means And a program for functioning as a determining means for determining the replacement time of the roller cleaning member.

  According to an eleventh aspect of the present invention, in order to determine the replacement time of the fixing roller and the pressure roller, a developing means for supplying a toner to the latent image formed on the image carrier to form a toner image. A transfer unit that transfers the toner image formed by the developing unit onto a transfer paper; a fixing roller that thermally fixes the transfer paper to which the toner is adhered by the transfer unit; and a roller cleaning member that cleans the surface of the pressure roller. , Means for specifying the location of dots during the image forming operation in a grid pattern in the sub-scanning direction and the main scanning direction, calculation means for calculating the pixel density at the specific location, and calculation results and pixel density by the calculation means And a program for functioning as a determining means for determining the replacement timing of the fixing roller and the pressure roller.

  According to the present invention, the replacement time of the roller cleaning member is determined on the basis of the pixel density at the specific location and the pixel density. Therefore, it is possible to realize provision of an image forming apparatus capable of accurately determining the maintenance inspection time, a roller replacement time determining method for the image forming apparatus, and a program.

1 is a diagram schematically illustrating an example of a basic configuration of a digital printer to which an image forming apparatus according to the present invention is applied. 1 is a diagram schematically showing an example of an internal mechanism in a laser printer main body to which an image forming apparatus according to the present invention is applied. FIG. 3 is an enlarged view of the fixing device (fixing unit) 30 shown in FIG. 2. 1 is a block diagram schematically showing an example of a printer controller 100 in the present embodiment. FIG. 4 is an explanatory diagram schematically showing writing area division of the image forming apparatus according to the present invention. 1 is a diagram illustrating an example of a web-type fixing device used in an image forming apparatus according to the present invention. FIG. 3 is an example of a flowchart for explaining the operation of the image forming apparatus according to the present invention. It is another example of the flowchart for demonstrating operation | movement of the image forming apparatus which concerns on this invention.

<Features>
In the present invention, a writing ASIC (application specific integrated circuit) has a function that can specify the location of dots in a grid pattern in the sub-scanning direction and the main scanning direction, and more accurately at the side edge. Since the pixel density can be calculated, the replacement time can be calculated accurately.

<Configuration>
FIG. 1 is a diagram schematically showing an example of a basic configuration of a digital printer to which an image forming apparatus according to the present invention is applied.
The printer includes a laser printer body 1, a controller 2 that performs image processing, an engine 3 that performs image formation, an engine control board 4 that controls the engine, and an operation panel 5.
The input / output interface 6 of the engine control board 4 exchanges data among the host computer 15, the controller 2, the operation panel 5, the engine board 4, and the engine 3.
A CPU (central processing unit) 7 is a program in a memory (ROM (read-only memory)) 9 in which a control program of the engine 3 is stored, a mode instruction from the operation panel 5, The entire engine 3 is controlled by a command from the controller 2.

In the figure, 8 is a work memory of the CPU 7 and an input buffer (RAM (random access memory)) for input data, and 10 is an error history of the engine 3 and a mode instruction content from the operation panel 5. A nonvolatile memory (EEPROM (electrically erasable read-only memory)) to be stored.
Reference numeral 11 denotes a DIP-SW (dip switch) for setting the control mode of the engine 3, and reference numeral 12 denotes a laser writing unit including an LD (laser diode), a polygon motor, and the like. It has a pixel number measuring means for counting.
Reference numeral 13 denotes a sequence device group that manages the engine sequence of the fixing system, the developing system, and the drive system. Reference numeral 14 denotes sensors for checking the paper path and the sequence state. Reference numeral 15 denotes a host computer that transmits and receives data.

FIG. 2 is a diagram schematically showing an example of an internal mechanism in a laser printer main body to which the image forming apparatus according to the present invention is applied.
In the figure, reference numeral 20 denotes an apparatus main body. Inside the apparatus main body 20, a photosensitive member 21 on a belt is provided in the center, and around the photosensitive member 21, a charging charger 22, a developing unit 23, and a transfer charger 24 are sequentially arranged in a driving direction indicated by an arrow in the drawing. The cleaning unit 25 is disposed, the optical writing unit 26 having the pixel number measuring unit is disposed above the developing unit 23, and the sheet feeding cassette 27 containing the sheet is detachable on the lower side of the apparatus main body 20. And a sheet conveying system for feeding and discharging.

  In the above configuration, when an image is formed, a motor (not shown) is driven to rotate the paper feed roller 28, and the sheet is sent out from the paper feed cassette 27 in the direction of the arrow in the figure, and the image is held by the registration roller pair 29 at the timing. It is conveyed to the lower side of the photosensitive member 21 as a body.

  The photosensitive member 21 rotates in the clockwise direction indicated by an arrow in the figure. At that time, the surface is uniformly charged by the charging charger 22, and then the laser beam from the optical writing device 26 is irradiated to electrostatically charge the photosensitive member 21. A latent image is formed. This latent image is visualized by toner when passing through the position of the developing unit 23, and this visible image is transferred by the transfer charger 24 onto the upper surface of the sheet conveyed to the lower side of the photoreceptor 21.

The sheet after the image transfer is conveyed to a fixing device (fixing unit) 30, and the transferred image is fixed by the fixing device 30.
The sheet exiting the fixing device 30 is transported into the face-down transport path 31 by an FD (face down) / FU (face up) switching solenoid claw 34, and the recording surface is faced down by a face-down discharge roller pair 32. The paper is discharged onto the face-down paper discharge tray 33 in the down state, or is directly discharged onto the face-up paper discharge tray 35 in the face-up state with the recording surface up.
On the other hand, the residual toner is removed from the photoreceptor 21 after image transfer by the cleaning device 25.

FIG. 3 is an enlarged view of the fixing device (fixing unit) 30 shown in FIG.
As shown in FIG. 3, the fixing unit 30 includes upper and lower fixing rollers 45 and 46 including heat source lamps 43 and 44, and a thermistor 58 that detects the surface temperature of the fixing roller 45 is in contact with the fixing roller 45. Thus, temperature information for controlling the surface temperature of the fixing rollers 45 and 46 to a necessary fixing temperature is obtained.
Further, the fixing unit 30 is equipped with a memory 49 for storing information unique to the fixing unit 30.

  The memory 49 is a non-volatile memory having a backup function using an EEPROM or a battery, and can be read and written. When the fixing unit 30 is mounted on the apparatus main body 1, the memory 49 is used for operation control mounted on the apparatus main body 1. It is connected to the main body CPU 7 (FIG. 1). With this configuration, information specific to the fixing unit 30 stored in the memory 49 can be read by the main body CPU 7 on the apparatus main body 1 side, and control according to the specific information can be performed. It is also possible to store information and use it as needed. For example, the main body CPU 7 can determine whether or not the usage frequency of the fixing unit 30 stored in the memory 49 has reached a value corresponding to the life of the fixing unit 30, and can perform processing corresponding thereto.

  The memory 49 is mounted on the substrate 81 together with the thermistor 82. The substrate 81 is installed in a heat insulating chamber 85 separated from the fixing rollers 45 and 46 in the fixing unit 30 by a heat insulating wall 83 to suppress the influence of heat from the fixing rollers 45 and 46. Further, when the ambient temperature of the substrate 81 becomes equal to or higher than a predetermined temperature, the temperature of the memory 49 is guaranteed by detecting the ambient temperature by the thermistor 82 and driving the cooling fan 84.

FIG. 4 is a block diagram schematically showing an example of the printer controller 100 in the present embodiment.
In the figure, reference numeral 101 denotes a CPU that controls the entire printer controller 100 according to a program in a programmable ROM (Programmable.ROM in the figure) 104, a mode instruction from the panel device, and a command from the host device 112. An IC card (Card) 102 supplies font data and a program from the outside.
Reference numeral 103 denotes a non-volatile random access memory (NVRAM) that stores the contents of mode instructions from the panel device, and reference numeral 104 denotes a program ROM in which a control program for the printer controller 100 is stored. It is.
Reference numeral 105 denotes a font ROM (Font ROM in the figure) that stores font pattern data, and 106 is used as a work memory for the CPU 101, an input buffer for input data, a page buffer for print data, a memory for downloaded fonts, and the like. RAM.

107 is an engine interface (Engine I / F in the figure) that communicates commands and status and print data with the engine 108, 108 is an engine that actually performs printing, 109 is a command with the panel device 110 and commands. And a panel interface (Panel I / F in the figure) for status communication.
Reference numeral 110 denotes a panel device that informs the user (user) of the current printer status and gives a mode instruction. Reference numeral 111 denotes a host interface (Host I / F in the figure) that communicates with the host device 112. Yes, usually Centro I / F or RS232C.
Reference numeral 112 denotes a host device which is an upper device of the printer, 113 denotes a disk interface (DISK I / F in the figure) for communicating with the disk device 114, and 114 denotes font data, a program, print data, etc. These are disk devices (DISK in the figure) for storing various data such as floppy disk devices and hard disk devices.

FIG. 5 is an explanatory view schematically showing the writing area division of the image forming apparatus according to the present invention.
As a pixel counting method, as shown in FIG. 5, the writable area can be divided into the sub-scanning direction and the main scanning direction, and the pixels can be counted in each divided area. When the number of scanning lines reaches N (LINE), the number of pixels is determined, and the determination is notified to the engine 3 and the CPU 7 by interruption.
The scanning line N can be set to a predetermined register from the outside and can be changed. The CPU 7 calculates the pixel density for each divided area. Here, the pixel density is the number of write pixels per area of the divided area.

  For the cleaning of the embodiment of the fixing device shown in FIG. 3, an aluminum cleaning roller 47 is provided in pressure contact with the pressure roller 46. The cleaning roller 47 can be driven by the pressure roller 46 or driven by a drive motor.

  FIG. 6 is a view showing an example of a web-type fixing device used in the image forming apparatus according to the present invention, and holds the web-like cleaning member 7-1 on the peripheral surface of the fixing roller 7-23. Cleaning means are provided for this purpose. This cleaning means includes a cleaning member 7-1, a take-up roller 7-2, a delivery roller 7-3, and a pressing roller 7-4.

  The cleaning member 7-1 is made of a material such as a web-like Nomex paper (registered trademark) or a heat-resistant nonwoven fabric. The take-up roller 7-2 is for moving and winding the cleaning member 7-1 and is driven by a drive motor. The delivery roller 7-3 is wound around one end of the cleaning member 7-1 and feeds the wound cleaning member 7-1. The pressing roller 7-4 presses the cleaning member 7-1 against the fixing roller 7-23 with a pressing spring.

FIG. 7 is an example of a flowchart for explaining the operation of the image forming apparatus according to the present invention.
The operation will be described with reference to FIG.
First, when the copy button is turned on (S1) and a print request is received from the host computer 16, image data is sent to the engine 3 via the printer controller 2.
The engine 3 performs image processing on the image data sent from the controller 2, and then performs LD lighting on the photosensitive member 21 to create an image (S2).
Here, the pixel number measuring means of the writing unit 12 divides the writing area in the main scanning direction and the sub-scanning direction, divides it into a grid pattern, specifies the pixels on the fixing side end, and counts the number of pixels.
The CPU 7 measures the pixel density based on the pixel number information of the writing unit 12 (S3), performs weighting calculation based on the measured pixel density and pixel density (S4), and calculates the lifetime determination integrated value A. (S5).
The CPU 7 determines whether or not the integrated value A exceeds a preset life set value C (S6). If the integrated value A exceeds the set life value C, the CPU 7 determines that the life is reached ( (S6 / Y), the user is notified of this (exchange display) on the panel (S7).
When the exchange is performed (S8), 0 is substituted for the integrated value A (S9), and the process is terminated.
When it is determined that the integrated value A is not greater than the life set value C (S6 / N), the process ends.

  Here, the weighting can be performed more suitably by setting the paper type, the linear velocity, and the color mode. This life determination is performed for the cleaning member, the fixing roller, and the pressure roller in the same flow by changing parameters such as an integrated value, a weight value, and a life value.

Further, in a fixing device in which the cleaning roller 47 is driven by a drive motor, the cleaning capability can be increased by increasing the speed of the cleaning roller 47, for example, when the predetermined threshold is exceeded.
FIG. 8 is another example of a flowchart for explaining the operation of the image forming apparatus according to the present invention.
The operation will be described with reference to FIG.
S21 to S23 are the same as S1 to S3 shown in FIG.
Weighting calculation is performed based on the measured pixel density and pixel density (S24), and the cleaning speed control integrated value B is calculated (S25).
The CPU 7 determines whether or not the integrated value B exceeds a preset speed determination value D (S26), and determines that the integrated value B exceeds the speed determination value D (S26 / Y). Then, the cleaning roller rotation speed is increased (S28) and the process ends. If it is determined that the integrated value B does not exceed the speed determination value D (S26 / N), the cleaning roller rotation speed is decreased (S27) and the process ends.

<Program>
The image forming apparatus according to the present invention described above is realized by a program that causes a computer to execute processing. Examples of the computer include general-purpose computers such as personal computers and workstations, but the present invention is not limited to this. Therefore, as an example, a case where the present invention is realized by a program will be described below.

As a program, for example,
To determine when to replace the fuser roller and pressure roller,
(1) developing means for supplying toner to the latent image formed on the image carrier to form a toner image;
(2) transfer means for transferring the toner image formed by the developing means onto transfer paper,
(3) It has a fixing roller that heat-fixes the transfer paper to which the toner is adhered by the transfer means, and a roller cleaning member that cleans the surface of the pressure roller. Means to specify a grid pattern in the scanning direction,
(4) a calculation means for calculating the pixel density at a specific location, and
(5) Determination means for determining the replacement time of the roller cleaning member based on the calculation result by the calculation means and the pixel density,
As a program for making it function.

Also, to determine when to replace the fixing roller and pressure roller,
(a) developing means for supplying toner to the latent image formed on the image carrier to form a toner image;
(b) transfer means for transferring the toner image formed by the developing means onto transfer paper,
(c) a fixing roller that heat-fixes the transfer paper to which the toner has been adhered by the transfer means, and a roller cleaning member that cleans the surface of the pressure roller. Means to specify a grid pattern in the scanning direction,
(d) a calculation means for calculating the pixel density at a specific location, and
(e) a determination unit that determines the replacement timing of the fixing roller and the pressure roller based on the calculation result by the calculation unit and the pixel density;
As a program for making it function.

  Thus, the image forming apparatus according to the present invention can be realized anywhere as long as there is a computer environment capable of executing the program.

<Storage medium>
Such a program may be stored in a computer-readable storage medium.
Here, examples of the storage medium include a computer-readable storage medium such as a CD-ROM (Compact Disc Read Only Memory), a flexible disk (FD), and a CD-R (CD Recordable), a flash memory, and a RAM (Random). Examples include semiconductor memories such as Access Memory (ROM), Read Only Memory (ROM), and FeRAM (ferroelectric memory), and HDD (Hard Disc Drive).

  The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. is there.

<Description of effects>
According to the present embodiment, since the replacement of the roller cleaning member is determined based on the pixel density at the specific location and the pixel density, in the case of use in which image formation is concentrated on the specific location, the replacement time is based on that location. Therefore, an output image suitable for the user can be provided.

  According to the present embodiment, the replacement of the fixing roller and the pressure roller is determined based on the pixel density at a specific location and the pixel density. Therefore, in the case of use in which image formation is concentrated at a specific location, the location is used as a reference. Since the replacement time can be calculated, an output image suitable for the user can be provided.

  According to this embodiment, since the operating speed of the roller cleaning member is controlled based on the pixel position, the cleaning ability or the oil application ability is increased when an image having a high density is formed only at a certain position, and the fixing roller Can always be maintained in an appropriate state.

  According to this embodiment, by applying control based on the difference in paper type, more suitable control can be performed and good fixing quality can be maintained.

  According to this embodiment, by applying control based on the difference in linear velocity, more suitable control can be performed and good fixing quality can be maintained.

  According to this embodiment, by applying control based on the difference in color mode, more suitable control can be performed and good fixing quality can be maintained.

  According to the present embodiment, the user can know the replacement time of the parts through the panel, and can suitably perform the parts replacement.

7-1 Cleaning member 7-2 Winding roller 7-3 Feeding roller 7-4 Pressing roller 7-5 Heater 7-10 Pressure roller 7-23 Fixing roller 7-48 Transfer paper 20 Device main body 21 Photoconductor 22 Charger charger 23 Developing Unit 24 Transfer Charger 25 Cleaning Device 26 Writing Device 27 Paper Feed Cassette 28 Paper Feed Roller 29 Registration Roller Pair 30 Fixing Device 43, 44 Heat Source Lamp 45, 46 Fixing Roller 49 Memory 47 Cleaning Roller

Japanese Patent Laid-Open No. 11-305611

Claims (11)

Developing means for supplying toner to the latent image formed on the image carrier to form a toner image;
Transfer means for transferring the toner image formed by the developing means onto transfer paper;
A fixing roller and a pressure roller for thermally fixing the transfer paper to which toner is adhered by the transfer means;
An image forming apparatus that includes a roller cleaning member that cleans the surface of the fixing roller or the pressure roller, and that specifies the location of dots in a grid pattern in the sub-scanning direction and the main scanning direction during an image forming operation In
A calculation means for calculating a pixel density at a specific location;
Determining means for determining a replacement time of the roller cleaning member based on a calculation result by the calculating means and a pixel density;
An image forming apparatus comprising: Developing means for supplying toner to the latent image formed on the image carrier to form a toner image;
Transfer means for transferring the toner image formed by the developing means onto transfer paper;
A fixing roller and a pressure roller for thermally fixing the transfer paper to which toner is adhered by the transfer means;
An image forming apparatus that includes a roller cleaning member that cleans the surface of the fixing roller or the pressure roller, and that specifies the location of dots in a grid pattern in the sub-scanning direction and the main scanning direction during an image forming operation In
A calculation means for calculating a pixel density at a specific location;
Determining means for determining a replacement time of the fixing roller and the pressure roller based on a calculation result by the calculating means and a pixel density;
An image forming apparatus comprising:   The image forming apparatus according to claim 1, wherein the determining unit determines an operating speed of the roller cleaning member based on a calculation result obtained by the calculating unit and a pixel density.   The image forming apparatus according to claim 1, wherein the determining unit determines based on paper type information.   The image forming apparatus according to claim 1, wherein the determining unit determines based on a linear velocity.   The image forming apparatus according to claim 1, wherein the determining unit determines based on a monochrome mode or a color mode.   3. The image forming apparatus according to claim 1, wherein the replacement of the component is notified to the user by displaying on a panel. Supplying toner to the latent image formed on the image carrier to form a toner image;
Transferring the toner image onto a transfer paper;
The transfer paper is thermally fixed with a fixing roller and a pressure roller,
Cleaning the surface of the fixing roller or the pressure roller with a roller cleaning member;
During the image forming operation, the location of dots is specified in a grid pattern in the sub-scanning direction and main scanning direction,
Calculate the pixel density at a specific location,
A roller replacement time determination method for an image forming apparatus, wherein the roller cleaning member replacement time is determined based on a calculation result and a pixel density. Supplying toner to the latent image formed on the image carrier to form a toner image;
Transferring the toner image onto a transfer paper;
The transfer paper is thermally fixed with a fixing roller and a pressure roller,
Cleaning the surface of the fixing roller or the pressure roller with a roller cleaning member;
During the image forming operation, the location of dots is specified in a grid pattern in the sub-scanning direction and main scanning direction,
Calculate the pixel density at a specific location,
A roller replacement time determination method for an image forming apparatus, wherein the replacement time of the fixing roller and the pressure roller is determined based on a calculation result and a pixel density. To determine when to replace the fuser roller and pressure roller,
Developing means for supplying toner to the latent image formed on the image carrier to form a toner image;
Transfer means for transferring the toner image formed by the developing means onto transfer paper;
A fixing roller that heat-fixes the transfer paper to which the toner is adhered by the transfer means, and a roller cleaning member that cleans the surface of the pressure roller, and the dot location is determined during the image forming operation in the sub-scanning direction and the main scanning direction. And means to specify a grid pattern,
A calculating unit that calculates a pixel density at a specific location; and a determining unit that determines a replacement time of the roller cleaning member based on a calculation result by the calculating unit and a pixel density;
Program to function as. To determine when to replace the fuser roller and pressure roller,
Developing means for supplying toner to the latent image formed on the image carrier to form a toner image;
Transfer means for transferring the toner image formed by the developing means onto transfer paper;
A fixing roller that heat-fixes the transfer paper to which the toner is adhered by the transfer unit, and a roller cleaning member that cleans the surface of the pressure roller, and the location of dots during the image forming operation is determined in the sub-scanning direction and the main scanning direction. And means to specify a grid pattern,
A calculation unit that calculates a pixel density at a specific location; and a determination unit that determines a replacement time of the fixing roller and the pressure roller based on a calculation result by the calculation unit and a pixel density;
Program to function as.

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