JP2928221B1 - Image forming apparatus and image forming apparatus cleaning method - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To simply and reliably perform cleaning of a pressure roller of a fixing device. SOLUTION: A detecting unit 102 detects a remaining amount of toner,
The detection result is supplied to the control unit 103. The control unit 103
When the remaining amount of toner detected by the detection unit 102 is equal to or smaller than a predetermined reference value, data corresponding to a predetermined image pattern stored in the image storage unit 104 is read and supplied to the image forming unit 105. The image forming unit 105 expands the data supplied from the image storage unit 104, and
6 The printing unit 106 generates cleaning paper on which an image pattern corresponding to the data supplied from the image forming unit 105 has been printed, and transports the cleaning paper to the fixing device. The fixing device cleans the pressure roller using the cleaning paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image forming apparatus and an image forming apparatus.
Image forming apparatus and image forming apparatus cleaning method, and more particularly to an image forming apparatus and an image forming apparatus that generate cleaning paper at a predetermined timing and clean a pressure roller
The present invention relates to an apparatus cleaning method .

[0002]

2. Description of the Related Art Conventionally, pressure roller cleaning paper used for cleaning a pressure roller constituting a fixing device of an electrophotographic printer is attached to an EP cartridge. The user cleans the pressure roller using the pressure roller cleaning paper.

[0003]

However, when using the pressure roller cleaning paper, it is necessary to have the user pass the cleaning paper. For this reason, the cleaning may not be reliably performed by the user, and the toner may continue to accumulate on the pressure roller, and the cleaning paper may not be able to remove the fixed toner. As a result, troubles such as paper entanglement and contamination occur, and the cycle of component replacement as the life of the fixing device has been shortened. This can be prevented by ensuring that the pressure roller is regularly cleaned by the cleaning paper.

There is a case where the cleaning paper is not passed by the user because the attached paper must be set in the printer, and the operation of feeding, passing, and discharging the printer, such as test printing, must be performed. This is because the operation is complicated.

In the cleaning method of the fixing device disclosed in Japanese Patent Application Laid-Open No. 63-266473, some sheets are forcibly applied when the number of prints reaches a predetermined number, and in the case of single-sided printing, the sheets are forcibly applied. A method has been proposed in which the printing surface is brought into contact with a pressure roller by passing the paper through double-sided printing to remove toner adhered to the pressure roller. However, the apparatus to which the above method is applied does not have the image storage unit 104 for storing the print pattern of the cleaning paper as shown in FIG. 3 as shown in FIG. Is used to clean toner adhered to the surface of the pressure roller. For this reason, depending on the print pattern, there is a problem in that the toner fixed to the surface of the pressure roller is adsorbed and the black density for cleaning is insufficient, and the cleaning effect may not be expected.

In order to use the printing result as cleaning paper, the toner on the surface of the pressure roller
There is a problem that stains are attached to the print result. further,
Since data for one-sided printing is forcibly passed through double-sided printing for a certain number of sheets, there is a problem that throughput is surely deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and aims to easily, regularly and reliably clean a pressure roller without imposing a burden on a user. It is.

[0008]

According to the first aspect of the present invention, there is provided an image forming apparatus for forming an image on a print sheet with toner, a toner holding unit for holding the toner, and applying heat to the print sheet. A fixing device that consists of a heat roller and a pressure roller that applies pressure to the printing paper. The fixing device fuses an image formed with toner on the printing paper to the printing paper by a hot press method, and the paper that conveys the printing paper to the fixing device. A conveyance unit, comprising a sheet reversing unit for reversing the front and back of the printing paper, an image forming apparatus that prints a predetermined image on one side or both sides of the printing paper, and a storage unit that stores a predetermined image pattern, detection means for detecting the remaining amount of toner held in the toner holding portion, the remaining amount of toner detected by the detecting means
Storing the remaining amount of toner and the remaining amount of toner
Detected by the remaining amount of stored toner and detection means
It is provided with a comparing means for comparing the amount of remaining toner, bets
The remaining toner amount stored in the toner remaining amount storage means is detected.
Is held in the toner holding unit detected by the discharging means.
When the remaining amount of toner is smaller than the remaining amount, the image pattern stored in the storage unit is printed on one side of the printing paper, the printing paper is reversed, and the printing paper is transported to the fixing device again.
An image forming apparatus cleaning method according to claim 2, wherein
An image forming device that forms an image on a printing paper with toner, and a toner
And a heat holding unit that holds the toner
Pressure roller to apply pressure to printing rollers and printing paper
Heats an image formed with toner on printing paper.
A fixing device that fuses to printing paper by a pressure method and a mark on the fixing device
The paper transport section that transports the printing paper and the front and back of the printing paper are reversed
And a sheet reversing unit for causing a predetermined image to be
An image forming apparatus that prints on one side or both sides,
Storage means for storing the image pattern;
Detecting means for detecting the remaining amount of toner held
Image forming device cleaning
A toning method, wherein the toner detected by the detecting means is
The remaining amount of toner is stored.
The remaining amount of toner detected by the
The remaining toner amount is detected by the detecting means.
When the remaining toner amount is less than the remaining amount,
The printed image pattern on one side of the printing paper
Inverts the paper, again to said that you conveyed to a fixing device
You. Image forming apparatus and image forming apparatus according to the present invention
In the learning method, the
Stores the remaining amount of toner and stores the remaining amount of toner
And the remaining amount of toner detected by the detection means
And the remaining amount of the stored toner is detected by the detecting means.
When the detected toner amount is smaller than the remaining amount, the image pattern stored in the storage unit is printed on one side of the printing paper,
The printing paper is turned over and transported to the fixing device again.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of an electrophotographic printer to which the image forming apparatus of the present invention is applied. The electrophotographic printer includes a printer unit 30 and a duplex unit 27. Laser scan unit 12
Outputs a laser beam for forming a latent image on the OPC drum 9. That is, the laser light generated by the laser diode 13 is applied to the polygon mirror 15 which is driven to rotate by the polygon motor 14. The laser light applied to the polygon motor 15 is reflected, enters the laser mirror 16, is further reflected by the laser mirror 16, scans the OPC drum 9, and forms a latent image.

On the OPC drum 9, a sensor (not shown) for outputting a horizontal synchronizing signal when a laser beam is scanned outside the printing area is provided in order to synchronize in the vertical and horizontal directions. However, a detailed description thereof is omitted here.

The EP cartridge 4 attaches negatively charged toner to the latent image formed on the OPC drum 9. That is, the toner stored in the toner hopper 5 is first supplied to the supply roller 6. As a result, the toner is supplied to the supply roller 6 pressed against the developing roller 7.
The laser scan unit 12 adheres to the surface of the developing roller 7 due to the negative charge (development bias).
Adheres to the latent image formed on the surface of the OPC drum 9.

Since the toner on the OPC drum 9 is negatively charged, the toner on the surface of the OPC drum 9 is transferred to the paper 25 by using the electrostatic force by positively charging the paper 25 by the transfer roller 11. The cleaning blade 10 scrapes off the toner remaining on the OPC drum 9 and cleans it.

The fixing device 1 has a built-in heater (not shown), and a heat roller 2 which can be heated to a high temperature;
, And fixes the toner on the sheet 25 by heat and pressure.

Next, the operation will be described. The paper 25 stored in the hopper 17 is fed one by one by the pick roller 18. Paper 2 fed from hopper 17
5 is sent in the direction of arrow A by the feed roller 21-1. Also, the paper 2 set on the front tray 19
Sheets 5 are fed one by one by the front pick roller 20 and fed in the direction of arrow H.

The paper 25 fed from the hopper 17 or the front tray 19 is fed in the direction of arrow B by the feed roller 21-2, passes through the developing and fixing steps of the EP cartridge 4 and the fixing device 1, and passes through the feed roller 21-. The paper is fed in the direction of the arrow G by the paper guide 23 which can swing with 4, and is discharged to the stacker 26 by the feed roller 21-5.

At the time of double-sided printing, paper 25 is fed from the hopper 17 or the front tray 19, and after the front surface is printed in the developing-fixing process, the paper 25 is moved along the paper guide 2
Switching is performed at 3, and the paper is taken into the duplex unit 27, the sheet is turned upside down, and the back side is printed again through the development-fixing process.

In the duplex unit 27, the paper 25 is fed in the direction of arrow C by the feed roller 21-6. Thereafter, the sheet is fed in the direction of arrow D by the swingable duplex guide 24 and the duplex roller 22. Then, in a state where the rear end of the sheet 25 is over the duplex guide 24 and over the duplex roller 22, the guide direction of the duplex guide 24 and the rotation direction of the duplex roller 22 are switched to form the sheet 2.
5 is sent in the direction of arrow E, and the front and back are reversed.

Thereafter, the paper 25 is fed to the feed roller 21.
-7, the direction of arrow F, feed rollers 21-8, 2
The paper is sequentially fed in the direction of arrow A by 1-9 and 21-1 and in the direction of arrow B by feed roller 21-2, and the back surface is printed again through the development-fixing process. Thereafter, the paper guide 23 is switched to the feed roller 21-4.
Is fed in the direction of arrow G by the
The sheet is discharged to the stacker 26 by -5.

The illustration and description of the motors and gears for driving the rollers, and the actuators for driving the paper guide 23 and the duplex guide 24 are omitted here.

FIG. 2 is a block diagram showing an example of the electrical configuration of the embodiment shown in FIG. The operation panel 101 transmits various information of the control unit 103 to an unillustrated LED (light).
emitting diode) or LCD (li
The settings can be displayed on a liquid crystal display, or a predetermined setting can be changed by a button or the like. The detection unit 102 detects the remaining amount of toner in the toner hopper 5 of the EP cartridge 4. Usually, a transmission type optical sensor or a capacitance type capacitor is used for the detection unit 102.

ROM (read only memory)
The image storage unit 104 configured by y) and the like stores a print pattern of cleaning paper as shown in FIG. The image forming unit 105 develops a print pattern stored in the image storage unit 104 and outputs the print pattern to the print unit 106.

The printing pattern of the cleaning paper mainly prints a solid black image longer than the peripheral length of the pressure roller 3 within the maximum printable range width for each paper size. The control unit 103 receives the signal of the detection unit 102 as an input, detects the amount of remaining toner, and issues an alarm indicating that there is no toner to the LED constituting the operation panel 101.
It can be displayed on a display device such as an LCD or an LCD.

Also, a signal such as a button press from the operation panel 101 is input and various settings can be changed. Also,
The control unit 103 develops the print pattern of the cleaning paper stored in the image storage unit 104 into the image forming unit 105, outputs the developed print pattern to the print unit 106, and controls the operation of the print unit 106. Is possible.

The control unit 103 has a CPU (cent
ral processing unit) and rewritable EEPROM (electrically
asable and programmable
ead only memory), etc.
As will be described later, the remaining toner amount detected by the detection unit 102 is stored, the newly detected remaining toner amount is compared with the stored remaining toner amount, and it is determined whether toner replenishment has been performed. It is made to judge. The printing unit 106 has the configuration described above with reference to FIG.

In the above configuration, the toner remaining on the surface of the OPC drum 9 adheres to the surface of the transfer roller 11 and adheres from the surface of the transfer roller 11 to the surface of the pressure roller 3 via the back surface of the paper 25. Further, the toner floating in the printer unit 27 is
Adheres to the surface of The toner adhering to the surface of the pressure roller 3 is fixed on the surface of the pressure roller 3 by the heat of the heat roller 2.

Due to the toner fixed on the surface of the pressure roller 3, a peeling failure occurs in which the paper 25 is hardly peeled off from the pressure roller 3, and troubles such as paper entanglement and paper contamination occur.

In the present invention, after printing the stored print pattern of the cleaning paper, the duplex unit 27 is printed.
Then, the paper is turned over to pass between the heat roller 2 and the pressure roller 3, so that the solid black print pattern comes into contact with the surface of the pressure roller 2. At this time, the toner adhered to the pressure roller 3 and the toner on the paper 25 are softened by applying heat again by the heat roller 2. As a result, the releasability of the toner fixed to the pressure roller 3 from the pressure roller 3 is greater than the releasability of the softened toner on the paper 25 from the paper 25.
The toner fixed on the upper surface is taken into the sheet 25. Thus, the pressure roller 3 is cleaned.

Next, the operation of the above-described embodiment shown in FIGS. 1 and 2 will be described with reference to the flowcharts of FIGS. In the image forming apparatus of the present invention, the method of cleaning the pressure roller 3 is as follows.
There are a method of directly instructing and executing from the operation panel 101, a method of executing when the EP cartridge 4 is replaced, and a method of executing in accordance with the number of prints.

First, referring to the flowchart of FIG.
A method in which a user directly instructs and executes the instruction from the operation panel 101, and a method which is executed when the EP cartridge 4 is replaced will be described. First, in step S100, the control unit 103 confirms whether or not the user has pressed the online button on the operation panel 101 and is in an offline state in which the printer does not receive print data from an upper-level host.

If it is off-line, step S10
Proceed to 1 to process the data being printed. Thereafter, the data reception operation of the printer is temporarily stopped.
Check if the cleaning mode has been set from. If the cleaning mode is not set, another setting is changed, or the setting is returned to the online state without changing the setting. Therefore, the process proceeds to step S102.

On the other hand, in step S100, if it is confirmed that the user is online, or if step S1
If it is determined in step 01 that the online mode has been set without setting the cleaning mode, the process proceeds to step S102.

In step S102, it is determined whether or not to perform the pressure roller cleaning process when replacing the EP cartridge 4. That is, in step S102, the detection unit 102 detects the remaining amount of toner in the toner hopper 5 of the EP cartridge 4. If the remaining amount of toner is larger than a preset reference value, the toner hopper 5
Since the toner remains in the cartridge and there is no need to replace the EP cartridge 4, the process is terminated. If the remaining amount of toner is smaller than the preset reference value, the process proceeds to step S103, where the LED on the operation panel 101 or the LC
A toner out alarm is displayed on D. The toner absence alarm may be displayed not only on the operation panel 101 but also on the display of the host.

After displaying the toner-out alarm, step S1
In step 04, the detection unit 102 detects the remaining amount of toner again. As a result, when it is detected that there is no remaining toner, it is determined that the EP cartridge 4 has not been replaced, and the process ends. On the other hand, if it is detected that there is a remaining amount of toner, it is determined that the EP cartridge 4 has been replaced, and the process proceeds to step S105 to perform a pressure roller cleaning process.

If the operation panel 101 sets the cleaning mode in step S101, the process proceeds to step S105. At this time, if unprinted print data remains during processing, the print data is forcibly discharged and printing is performed.

In step S105, the control unit 103 first confirms whether the setting of the sheet feeding destination is from the hopper 17 or the front tray 19. If the paper feed destination is set to the hopper 17,
In step S106, the size of the sheet 25 set on the hopper 17 is read from a sheet size sensor (not shown) attached to the hopper 17.

Thereafter, in step S 107, the print pattern of the cleaning paper corresponding to the size of the paper 25 is read from the image storage unit 104. Then, the process proceeds to step S108, where the read print pattern is developed on the image forming unit 105. Next, in step S109, the pick roller 18 is driven, and
5 is fed.

On the other hand, if the control unit 103 determines in step S105 that the paper feed destination is set to the front tray 19, the process proceeds to step S110, where the control panel 103 or the host computer sets the paper feed destination. The size of the paper 25 on the front tray 19 is read. Thereafter, in step S111, a print pattern of the cleaning paper corresponding to the size of the sheet 25 is read from the image storage unit 104.

Next, the process proceeds to step S 112, where the read print pattern is developed on the image forming unit 105. next,
In step S113, the front pick roller 20
Is driven to feed the paper 25 from the front tray 19.

Step S109 or step S113
In step, when the sheet is fed, the process proceeds to step S114. In step S114, the fed paper 25
Is the first pass and the process of forming a print pattern of the cleaning paper on the surface of the paper 25 is necessary, or is the second pass and the printing printed on the front surface of the paper 25 is necessary. It is checked whether the pattern is inverted by the duplex unit 27 and is in a state of being on the back side.

If the number of paper passes is the first time, step S
Proceeding to 115, a print pattern is formed on the OPC drum 9 by the laser light from the laser unit 12. Next, in step S116, the latent image developed with the toner on the OPC drum 9 is transferred onto the paper 25.
Next, in step S117, the toner transferred to the paper 25 is fixed by passing the paper 25 between the heat roller 2 and the pressure roller 3 of the fixing device 1.

In step S118, if the paper 25 that has passed through the fixing device 1 is the first paper passing, the paper guide 2
3 is driven by the control of the control unit 103 so that the paper 25 is taken into the duplex unit 27.
As a result, the paper 25 is guided by the paper guide 23,
It is taken into the duplex unit 27.

Next, in step S119, the duplex guide 24 is driven by the control of the control unit 103 so that the paper 25 is sucked into the duplex tray 28. As a result, the paper 25 is sucked into the duplex tray 28 by the guidance of the duplex guide 24. At this time, in step S120, the control unit 103 rotates the duplex roller 22 forward so that the paper 25 advances in the direction of arrow D.

Then, the process returns to step S119 in a state where the end portion of the sheet 25 is disengaged from the duplex guide 24 and is placed on the duplex roller 22, and the duplex guide 24 is driven to guide the sheet 25 in the F direction. Is done. Then, the process proceeds to step S121,
The control unit 103 causes the duplex roller 22 to
5 is reversed so as to advance in the direction of arrow E. As a result, the paper 25 is guided in the direction of arrow F by the duplex guide 24, and is discharged from the duplex tray 27.
Then, the sheet 25 whose front and back surfaces are reversed advances in the directions of arrows A and B, and the second sheet passing is performed. Thereafter, the process returns to step S114.

In step S114, since the cleaning pattern has already been printed on the back surface of the sheet 25, and there is no need to print the cleaning pattern, the print pattern generation processing in steps S115 and S116 is skipped, and step S117 is performed. Proceed to.

In step S117, the image is fixed. That is, the paper 25 on which the cleaning pattern is printed on the back surface is passed between the heat roller 2 and the pressure roller 3 of the fixing device 1, so that the solid black print pattern comes into contact with the surface of the pressure roller 2. At this time,
Heat is applied again to the paper 25 by the heat roller 2 to soften the toner. As a result, the releasability of the toner fixed to the pressure roller 3 is better for the paper 25.
Since the releasability of the softened toner is larger than the above, the toner fixed on the pressure roller 3 is taken into the paper 25 and the pressure roller 3 is cleaned.

Next, the process proceeds to step S118, where the control unit 1
In No. 03, the paper guide 23 is driven so that the paper 25 is guided in the direction of arrow G because the number of times the paper 25 has passed through the fixing device 1 is the second time. As a result, paper 25
Is guided in the direction of arrow G by the paper guide 23. Then, in step S122, the paper 25 is discharged (discharged) to the stacker 26 by the feed roller 21-5, and the process ends.

As described above, in the above embodiment,
The cleaning of the toner that gradually adheres to the surface of the pressure roller 3 of the fixing device 1 is performed when the EP cartridge is replaced by detecting the remaining amount of the toner. This makes it possible to reliably clean the pressure roller 3 before a large amount of toner adheres to the pressure roller 3. Further, the printer stores a print pattern for cleaning, the printer generates cleaning paper, and the cleaning paper is inverted by the duplex printing mechanism.
By passing the paper, the user can easily clean the toner fixed to the pressure roller 3 of the fixing device 1. Further, since the printer has the cleaning mode, the user can easily clean the pressure roller 3 of the fixing device 1 at any time other than when the EP cartridge is replaced.

The basic configuration of the printer is the same as that of the above-described embodiment shown in FIG. 1, but the cleaning of the pressure roller 3 of the fixing unit 1 is performed by the control unit 103 of the printer main body.
It is also possible for the printer to automatically execute it based on the count value of the number of prints stored by the printer. That is, the control unit 103 is equipped with a print number counter for counting the number of prints, and when the number reaches the preset number, the pressure roller 3 of the fixing device 1 is cleaned.

Next, referring to the flowchart of FIG.
The cleaning operation of the pressure roller 3 of the fixing device 1 using the printed sheet counter will be described. However,
The same steps as those in FIG. 4 are denoted by the same reference numerals, and a description thereof will be omitted as appropriate. First, the control unit 103
In advance, the number of prints X serving as a reference for determining whether or not to perform the cleaning operation of the pressure roller 3 of the fixing device 1 is set in advance. Then, in step 202, it is determined whether or not the actual number of printed sheets P is larger than the reference value X.

If it is determined that the number of prints P is larger than the reference value X, the process proceeds to step S203. Step S203
, The operation panel 10 is controlled by the control unit 103.
1 and an alarm indicating that a cleaning operation is required is displayed on the display of the host.

The user can select whether or not to perform the cleaning operation. In step S204, the user selects one of them using the operation panel 101. If the user selects to perform cleaning, the process proceeds to step S205, where the count value P of the printed sheet counter is reset (P = 0), and the cleaning operation from step S105 is performed. Thus, the pressure roller 3 of the fixing device 1 can be reliably cleaned.
The operation after step S105 is the same as the case described above with reference to FIG. 4, and the description thereof is omitted here.

If it is determined in step S202 that the number of prints P is smaller than or equal to the reference value X, the process ends. If the user selects not to perform cleaning in step S204, the process ends.

As another embodiment, the detection of whether or not the EP cartridge 4 has been replaced is performed not by the detection unit 102 detecting the remaining amount of toner as described above, but by the number of prints. A counter for the number of printed sheets to be counted may be mounted on the EP cartridge 4, and the counting may be performed based on the count value of the number of printed sheets counter.

That is, a counter for the number of printed sheets is mounted on the EP cartridge 4, and the counted number of printed sheets P is temporarily stored in the control unit 103 as P2. Then, the control unit 103 checks the count value of the number-of-printed-sheets counter of the EP cartridge 4, and if P <P2, determines that the EP cartridge 4 has been replaced, and proceeds to step S10 in FIG.
It is also possible to execute the cleaning process of the pressure roller 3 of the fixing device 1 after 5.

In the above embodiment, the case where the present invention is applied to an electrophotographic printer has been described. However, the present invention can be applied to other printers.

[0057]

As described above, the image formation according to claim 1
3. An apparatus and an image forming apparatus according to claim 2.
According to the method, the residual toner detected by the detecting means is
The amount of toner stored, and the detection means
Is compared with the remaining amount of toner detected by
The amount of remaining toner is detected by the detection means.
When the remaining amount is less than the remaining amount, the image pattern stored in the storage unit is printed on one side of the printing paper, the printing paper is reversed, and the paper is conveyed to the fixing device again, so that maintenance of the pressure roller is easy. And it can be performed reliably.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of an embodiment of an image forming apparatus according to the present invention.

FIG. 2 is a block diagram showing an example of an electrical configuration of the embodiment of FIG.

FIG. 3 is a diagram illustrating an example of cleaning paper.

FIG. 4 is a flowchart illustrating a cleaning method of the image forming apparatus of FIG. 1;

FIG. 5 is a flowchart illustrating another cleaning method of the image forming apparatus of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixing device 2 heat roller 3 pressure roller 4 EP cartridge 5 toner hopper 6 supply roller 7 developing roller 8 charger 9 OPC drum 10 cleaning blade 11 transfer roller 12 laser scan unit 13 laser diode 14 polygon motor 15 polygon mirror 16 laser mirror 17 hopper 18 Pick roller 19 Front tray 20 Front pick roller 21 Feed roller 22 Duplex roller 23 Paper guide 24 Duplex guide 25 Paper 26 Stacker 27 Duplex unit 28 Duplex tray 30 Printer unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03G 15/20 105 G03G 15/08 114 G03G 21/10

Claims (2)

(57) [Claims] 1. An image forming apparatus for forming an image on a print sheet with toner, a toner holding unit for holding the toner, a heat roller for applying heat to the print sheet, and a pressure roller for applying pressure to the print sheet. A fixing device that fuses the image formed with the toner on the printing paper to the printing paper by a hot press method, a paper transport unit that transports the printing paper to the fixing device, and the printing paper An image forming apparatus for printing a predetermined image on one side or both sides of the printing paper, comprising: a sheet reversing unit for reversing the front and back sides of the printing paper; and a storage unit for storing a predetermined image pattern; Detecting means for detecting the remaining amount of the retained toner; and recording the remaining amount of the toner detected by the detecting means.
Storing the remaining amount of toner and storing the remaining amount of toner stored in the remaining amount storing unit.
Remaining amount and remaining amount of toner detected by the detecting unit
Comparing means for comparing the toner amount stored in the toner remaining amount storage means.
The remaining amount of toner is detected by the detecting means.
When the remaining amount of the toner held in the holding unit is less than
Can, and printing the image pattern stored in said storage means on one of the print sheet, and reversing the printing paper, again, the image forming apparatus characterized by conveying to the fixing device. 2. An image forming an image on a printing paper with toner.
An image forming device, a toner holding unit for holding the toner,
Heat roller for applying heat to the printing paper and the printing paper
And a pressure roller for applying pressure.
The image formed with toner on paper is subjected to the hot pressing method.
A fixing device for fusing to a printing paper; and
Turn the paper transport unit that transports the paper upside down
And a paper reversing unit for rotating a predetermined image for the printing.
An image forming apparatus that prints on one side or both sides of paper,
Storage means for storing a predetermined image pattern, and the toner
A detection for detecting the remaining amount of the toner held in the holding unit.
For cleaning an image forming apparatus having an output unit
A method of cleaning the forming apparatus, wherein a remaining amount of the toner detected by the detecting unit is recorded.
Storing and storing the remaining amount of the toner,
The remaining amount of toner stored is compared with the remaining amount of toner detected by the detecting means.
When the detected remaining amount of the toner is smaller than the remaining amount,
Means for printing the image pattern stored in the means on a piece of printing paper
Surface, and the printing paper is reversed, and the fixing device is again
Image forming apparatus cleaning transported to
Method.