JP2019035785A - Image formation apparatus, control method and program of image formation apparatus - Google Patents

Abstract

When a separation process cannot be performed due to a power failure for a component that is performing a separation process during a normal shutdown, the recovery at the time of recovery depends on the time from the power failure until the power supply returns. It was necessary to automatically prevent image degradation by changing the processing operation. A plurality of components that are pressed against each other at the time of image formation and separated from each other at the time of stoppage are detected. After a power failure is detected, the power failure information is stored in a memory, and the power failure occurs when the power is restored from the power failure. An image forming apparatus that executes a return process for causing the component parts to perform rotational driving for a second predetermined time in a pressure contact state based on the determined time. [Selection] Figure 8

Description

  The present invention relates to a return operation of an image forming apparatus such as a copying machine or a printer using an electrophotographic process method, a control method therefor, and a program.

  2. Description of the Related Art Conventionally, some image forming apparatuses perform control so that when a commercial power supply is restored after a power failure, the state is automatically restored to a state corresponding to the state of the power supply SW at the time of the power failure without any user operation. In this case, a seesaw SW capable of maintaining the state is used as the power supply SW.

In Patent Document 1, in an image forming apparatus in which an anti-offset liquid is applied between a fixing roller and a pressure roller, after the image forming apparatus has been stopped for a certain period of time, paper on which no toner is placed is removed from the nip portion of the roller. The technology to pass through is disclosed. Thereby, it is possible to prevent the offset prevention liquid from adhering to the paper when the operation is resumed.
Patent Document 2 discloses an apparatus that separates an image forming unit that is in contact with an image carrier when the image forming apparatus is stopped for a long time.

JP-A-5-72842 JP 2002-149032 JP

The image forming apparatuses described in Patent Documents 1 and 2 execute processing so that the next image formation is not hindered when the main body is stopped for a long time. However, the image forming apparatus is not supposed to cope with a case where the power OFF state due to an unexpected power failure or the like continues for a long time.
The image forming apparatus described in Patent Document 1 passes the paper once so that the offset preventing liquid does not adhere to the paper, and extra paper is required. Furthermore, there is also disclosed a means for returning to normal when a power failure occurs unexpectedly, such as a power failure, and the fixing roller and pressure roller, primary transfer roller and photoconductor drum, etc. are in contact with each other for a long time. There is no.
Further, in the configuration of the prior art that returns to the state of the seesaw SW after a power failure, it is not known how long the power has been cut off because it is not known that a power failure has occurred.

In order to solve the above problems, an image forming apparatus of the present invention has the following configuration.
An image forming apparatus having a plurality of components that are pressed against each other at the time of image formation and separated from each other at the time of stoppage. The image forming apparatus has a detection means for detecting a power failure, a storage means for storing power failure information, and power supply from the power failure. And a control means for executing rotation driving of the plurality of component parts in a pressure contact state for a second predetermined time if the power failure time is equal to or longer than the first predetermined time. Features.

  When a separation process cannot be performed due to a power failure for a component that is performing a separation process during normal shutdown, the recovery process operation at the time of recovery is performed according to the time from the power failure until the power supply returns. By changing the image quality, it is possible to automatically prevent image deterioration.

Sectional drawing which shows the structure of the image forming apparatus which concerns on the Example of this invention. The figure which shows the separation operation | movement of the primary transfer roller which concerns on the Example of this invention. The figure which shows the separation operation | movement of the pressure roller which concerns on the Example of this invention. Correspondence table between power failure state and return state according to an embodiment of the present invention Control block diagram according to an embodiment of the present invention The figure which shows the timing chart which concerns on the Example of this invention The figure which shows the flowchart which concerns on the Example of this invention. The figure which shows the flowchart which concerns on the Example of this invention.

[Configuration of image forming apparatus]
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
First, the configuration of the image forming apparatus 100 including a plurality of component parts will be described. FIG. 1 is a cross-sectional view illustrating the basic configuration of the image forming apparatus 100, and includes a user interface (UI) 126 for a user to operate. Here, an electrophotographic full-color image forming apparatus 100 in which a toner container that contains a developer (hereinafter referred to as “toner”) to be replenished to the developing device is detachable is illustrated.

The image forming apparatus 100 includes process cartridges 103Y, 103M, 103C, and 103K that are arranged on a substantially horizontal straight line with a fixed interval in a detachable manner, and yellow (Y), magenta (M), and cyan, respectively. (C) A black (K) image is formed.
Each process cartridge 103 is provided with a drum-type electrophotographic photosensitive member (hereinafter referred to as “photosensitive drum”) 104 as an image carrier. Around the photosensitive drum 104, a primary charger 109, a developing unit 105, and a drum cleaner device 112 are arranged. Further, primary transfer rollers 114 are arranged at positions facing the respective photosensitive drums 104 via the intermediate transfer belt 101. Further, a laser exposure device 108 is installed below the primary charger 109 and the developing means 105.

The photosensitive drum 104 is a negatively charged OPC photosensitive member having a photoconductive layer on an aluminum drum base, and is driven to rotate at a predetermined process speed by a driving device (not shown).
A primary charger 109 as a primary charging unit uniformly charges the surface of the photosensitive drum 104 to a predetermined negative potential with a charging bias voltage applied from a charging bias power source (not shown).

The developing means 105 contains toner (developer), and attaches each color toner to each electrostatic latent image formed on each photoconductive drum 104 to develop (visualize) the toner image.
A primary transfer roller 114 as a primary transfer unit is disposed in the intermediate transfer belt unit 115 so as to face the photosensitive drum 104 and is urged toward the photosensitive drum 104.
The drum cleaner device 112 is a cleaning unit for removing the transfer residual toner remaining on the photosensitive drum 104 during the primary transfer from the photosensitive drum 104, and includes a cleaning blade and the like.

The intermediate transfer belt unit 115 includes a drive roller 116 that also serves as a secondary transfer counter roller and a gear on a drive roller shaft (not shown), and is rotationally driven by a drive gear on a main body (not shown). The drive roller 116 is disposed so as to face the secondary transfer roller 117 with the intermediate transfer belt 101 interposed therebetween.
A fixing device 150 having a fixing roller 118 and a pressure roller 119 is installed in a vertical path configuration on the downstream side of the secondary transfer roller 117 in the conveyance direction of the recording medium P.

  The laser exposure device 108 is constituted by laser light emitting means for emitting light corresponding to a time-series electric digital pixel signal of given image information. The laser exposure device 108 forms an electrostatic latent image of each color according to image information on the surface of each photoconductor drum 104 charged by each primary charger 109 by exposing each photoconductor drum 104.

[Operation of image forming apparatus]
Next, an image forming operation by the above-described image forming apparatus 100 will be described.
When an original is read by the original reading device 120 and an image formation start signal is issued, each photosensitive drum 104 of each process cartridge 103 is driven to rotate at a predetermined process speed and is uniformly negatively charged by the primary charger 109. Is charged. The laser exposure device 108 irradiates an externally input color-separated image signal from the laser light emitting element, and forms an electrostatic latent image of each color on each photoconductive drum 104.
First, each color toner is attached to the electrostatic latent image formed on the photosensitive drum 104 by the developing means 105 to which a developing bias having the same polarity as the charging polarity (negative polarity) of the photosensitive drum 104 is applied. To visualize it as a toner image. This toner image is primarily transferred to the driven intermediate transfer belt 101 by a primary transfer roller 114 to which a photosensitive drum 104 and a primary transfer bias (opposite polarity (positive polarity) to toner) are applied.

Thereafter, in the same manner, yellow, magenta, cyan, and black toner images are sequentially superimposed on the intermediate transfer belt 101 to form a full-color toner image on the intermediate transfer belt 101.
The transfer residual toner remaining on each photoconductive drum 104 is scraped off and collected by a cleaner blade or the like provided in each drum cleaner device 112.

  Then, the full color toner image on the intermediate transfer belt 101 is moved to the secondary transfer portion between the transfer drive roller (secondary transfer counter roller) 116 and the secondary transfer roller 117. The recording medium P such as paper fed from the paper feed cassette 121 or the manual feed tray 122 passes through the transport path formed substantially vertically in accordance with the timing at which the leading edge of the toner image is moved to the secondary transfer unit. Then, it is conveyed by the registration roller 123 to the secondary transfer section. A full-color toner image is secondarily transferred collectively to the recording medium P conveyed to the secondary transfer section by the secondary transfer roller 117 to which a secondary transfer bias (opposite polarity (positive polarity) from the toner) is applied. The

At this time, the residual toner remaining on the intermediate transfer belt 101 during the secondary transfer is scraped off by the transfer cleaning device 107, and is conveyed and collected as waste toner.
The recording medium P on which the full-color toner image is formed is conveyed to the fixing device 150 located downstream, and the full-color toner image is heated and pressed at the fixing nip portion between the fixing roller 118 and the pressure roller 119. Then, it is thermally fixed on the surface of the recording medium P. Thereafter, the recording medium P is discharged onto the discharge tray 125 on the upper surface of the main body by the first discharge roller 124, and a series of image forming operations is completed.

[Separation between primary transfer roller and photosensitive drum]
The movement of the primary transfer roller 114 disposed inside the intermediate transfer belt 101 will be described with reference to FIG. During normal image formation, the primary transfer roller 114 is in contact with the photosensitive drum 104 via the intermediate transfer belt 101 (FIG. 2a). If the photosensitive drum 104 and the intermediate transfer belt 101 are pulled out for replacement in such a contact state, they may rub against each other, scratching the surface and causing image defects.

In order to avoid this, the suspension roller 127 that suspends the intermediate transfer belt 101 and the primary transfer roller 114 are separated from the photosensitive drum 104 at a predetermined timing, for example, when the door is opened (FIG. 2b). . By doing so, it is possible to replace the surfaces of the photosensitive drum 104 and the intermediate transfer belt 101 without scratching each other. When the primary transfer roller 114 is in contact with the photosensitive drum 104 via the intermediate transfer belt 101, the intermediate transfer belt 101 is suspended by the respective rollers with a predetermined tension. If the belt continues to stop in this state, the intermediate transfer belt 101 will be curled, and when reading the density detection pattern formed on the surface of the intermediate transfer belt 101, the error in the distance from the sensor will increase, and the density adjustment will be successful. There is a possibility that trouble will be lost.

  Therefore, at the timing of shut-off of the image forming apparatus 100 where the stop time continues, the suspension roller 127 and the primary transfer roller 114, which suspend the intermediate transfer belt 101, are separated from the photosensitive drum 104 (FIG. 2b). The tension is not applied. The operation of separating the primary transfer roller 114 and the suspension roller 127 can be realized, for example, by moving a member supporting each roller using a motor.

  Next, with reference to FIG. 3, the operation of pressing and separating the fixing roller 118 and the pressure roller 119 in the fixing device 150 will be described. During normal image formation, the pressure roller 119 is in contact with the fixing roller 118 with a predetermined pressure (FIG. 3a). At this time, as shown in FIG. 3a, the fixing roller 118 is in a deformed state as indicated by the letter C. If this state continues for a predetermined time or longer, the fixing roller 118 does not return from the deformed state, causing image defects. The possibility comes out. In order to avoid the fixing roller 118 from being deformed by such a pressure state, the pressure roller 119 can be separated from the fixing roller 118 as shown in FIG.

In this way, deformation of the fixing roller 118 can be suppressed and image defects can be prevented. The separation operation of the pressure roller 119 can be realized by moving the support member of the pressure roller 119 using, for example, a motor. Further, the same effect can be obtained not by the pressure roller 119 but by the fixing roller 118 for the separation operation. Further, by separating the fixing roller 118 and the pressure roller 119, there is an advantage that it is easy to remove the paper sandwiched between the rollers when the paper is jammed.

  FIG. 4 is a table showing a correspondence relationship between a state when the power supply from the commercial power supply to the image forming apparatus 100 is stopped and a state where the image forming apparatus is shifted when the power supply is restored thereafter. This is a process that is automatically performed without any user operation. Here, it is assumed that a power failure occurs. When a power failure occurs when the image forming apparatus 100 is in the power OFF state, the power is turned OFF even when the power supply is restored. When the image forming apparatus 100 is in the power-on state, for example, when a power failure occurs during standby, the image forming apparatus 100 is in a standby state upon return. Even when a power failure occurs during printing or sleep, the printer shifts to the standby state upon return. In this way, the operation is basically restored to the power failure state, but when the power is turned on, the operation returns to the standby state.

  Next, control of the image forming apparatus according to the present embodiment will be described with reference to the block diagram of FIG. The control board 200 that controls the image forming apparatus 100 is supplied with DC power generated by a power source 300 from a commercial power source. The control board 200 has a CPU 201 to which a ROM 206, a RAM 207, and an EEPROM 208 are connected. In response to a signal from the CPU 201, the ASIC 202 issues a command to drive the fixing attachment / detachment mechanism 213 that presses and separates the fixing roller 118 and the pressure roller 119 and the first transfer attachment / detachment mechanism 214 that presses and separates the primary transfer roller 114. Is done. There is a power failure detection unit 203 in the input portion supplied from the power supply 300. Here, at least the input voltage of the power supplied from the commercial power source to the control board 200 is detected to detect the power failure. The RTC 204 is also supplied with power from the battery 209 so as to be operable even when the power supply from the power source 300 is lost, and has a function of measuring the current time.

[Power failure detection operation]
Here, a specific operation for power failure detection will be described. Although the input from the power source 300 to the control board 200 is not necessarily one system, the power failure detection unit 203 is connected to the power system linked to the supply from the commercial power source, for example, the output of the all-night power source. In this embodiment, since the output of the night power supply is 12 [V], it can be detected that the night power 12 [V] input to the control board 200 has dropped to about the threshold voltage 10 [V]. Is set.

This threshold voltage is determined for the purpose of detecting before a trouble occurs in a device driven by the night-time power supply 12 [V]. Specifically, when the low-voltage malfunction prevention function of the DC / DC converter supplied with the night-time power supply 12 [V] operates at 7.5 [V], for example, 10 [V] ] Is set to the set value. Of course, this threshold voltage needs to be a voltage that is not detected when the image forming apparatus is operating normally and the commercial power is normally supplied.

When the power failure detection unit 203 detects a voltage drop in this manner, it determines that a power failure has occurred, and writes a power failure occurrence flag in the EEPROM 208 and simultaneously writes the date and time information of the RTC 204. After that, when recovering from the power failure, the length of time that the power failure occurred is obtained by taking the difference between the date and time information stored in the EEPROM 208 and the date and time information newly acquired from the RTC 204. Can be calculated. Depending on the length of this time, the recovery operation at the time of return can be optimally controlled as will be described later, and image deterioration can be prevented.

  FIG. 6 is a timing chart showing the movement at this time. When the night-time power supply 12 [V] falls below the threshold voltage (Vth) 10 [V], the power failure detection unit 203 determines that a power failure has occurred, sets a power failure detection flag, and writes information about the flag in the EEPROM 208. At this time, the voltage continues to decrease, but the writing is completed before it falls below the voltage required for writing.

  Next, the contents of the recovery according to the above-described stop time will be described. When the primary transfer roller 114 is in contact with the photosensitive drum 104 via the intermediate transfer belt 101 when the power is restored from a power failure, the time during which the power was stopped due to the power failure is reduced to a predetermined time, for example, 4 hours (T1). Check if it has passed. Therefore, if it is 4 hours (T1) or less, it is determined that the intermediate transfer belt 101 is not particularly damaged due to winding or the like, and a normal start-up process is performed to shift to a standby state.

The normal start-up process in this case is a control for performing density correction by generating a density correction pattern on the intermediate transfer belt 101 and reading it with an optical sensor (not shown). is there. In addition, as a start-up process, there is a control for reading a color misregistration correction pattern with an optical sensor (not shown) and correcting a positional deviation between the colors.
If the stop time exceeds 4 hours (T1), it is determined that the intermediate transfer belt 101 is damaged, and the intermediate transfer belt 101 is rotationally driven, for example, for 30 seconds before normal startup processing. By doing so, since start-up processing such as density correction control and color misregistration correction control can be performed in a state where the intermediate transfer belt 101 is curled, deterioration in image quality can be suppressed.

Similarly, when the fixing roller 118 and the pressure roller 119 are in contact with each other in a pressurized state upon recovery from a power failure, if the stop time at the time of the power failure is, for example, within 8 hours (T2), the fixing roller 118 The operation of separating the pressure roller 119 and the pressure roller 119 is executed to shift to the standby state.
If the time that has been stopped due to a power failure exceeds 8 hours (T2), it is determined that the fixing roller 118 is damaged. In the normal startup process, no particular operation is performed, but here, by rotating the fixing roller 118 and the pressure roller 119 for a predetermined time (for example, several minutes), the state of the fixing roller 118 before the power failure is brought closer to the image quality. Can be suppressed. After rotating for a predetermined time, the fixing roller 118 and the pressure roller 119 are separated from each other and then the standby state is entered. Note that during the rotation for a predetermined time, the start-up process for parts other than the fixing device is also performed in parallel, so that the time for the start-up process can be shortened.

Next, the control at the time of a power failure and the return control from the power failure state of the image forming apparatus of the present invention will be described with reference to the flowcharts of FIGS. The following processing is realized by the CPU 201 on the control board 200 developing the program stored in the ROM 206 in the RAM 207 and executing it.
FIG. 7 is a flowchart showing the control when a power failure occurs. When a power failure occurs (S101), the power failure detection unit 203 detects a power failure as described above (S102), and sets a power failure occurrence flag in the EEPROM 208. At this time, the time t1 when the power failure occurs is simultaneously stored in the EEPROM 208 (S103). The control so far is executed until the power supply is stopped (S104).

FIG. 8 is a flowchart showing control when returning from a power failure. When the supply of power is resumed (S201), first, the data in the EEPROM 208 is checked to see if the power failure occurrence flag is set (S202).
If the power failure flag is not set (No in S202), it is determined that a power failure has not occurred and the shutdown has been performed normally, and after performing normal startup processing (S213), the device enters the standby state. (S214), and the sequence is terminated (S215). The normal startup process at this time is a process such as density correction control or color misregistration correction control as described above.
On the other hand, when the power failure occurrence flag is set in S202 (Yes in S202), the power failure time Δt = t2-t1 is calculated from the current time t2 obtained by the RTC 204 and the power failure occurrence time t1 (S203).

Next, in S204, it is determined whether or not the primary transfer roller 114 is in contact with the photosensitive drum 104 via the intermediate transfer belt 101. If it is in contact (Yes in S204), the process proceeds to S205, and it is determined whether the time Δt during which a power failure has occurred is greater than a predetermined time T1. In the above example, T1 is 4 hours, and this value is determined in advance based on the examination data. When Δt is larger than T1, the intermediate transfer belt 101 and the photosensitive drum 104 are driven to rotate while the primary transfer roller 114 is in contact with the photosensitive drum 104 via the intermediate transfer belt 101 (S206). Although the primary transfer roller 114 is also rotating, it may be configured to rotate following the friction with the inner side of the intermediate transfer belt 101.
Subsequently, the process proceeds to S207. Similarly, if it is not in the pressure contact state in S204 (No in S204), and Δt is equal to or less than T1 in S205 (No in S205), the process proceeds to S207.

In step S207, after the rotation is started, it is determined whether the fixing roller 118 and the pressure roller 119 are in a pressure contact state. When the fixing roller 118 and the pressure roller 119 are in a pressure contact state (Yes in S207), it is determined whether or not the time Δt during which a power failure occurred in S208 is greater than a predetermined time T2. In the example described above, T2 is 8 hours, and this value is determined in advance based on the examination data. When Δt is larger than T2 (Yes in S208), the fixing roller 118 and the pressure roller 119 are rotationally driven (S209).
Subsequently, the process proceeds to S210. Further, if the fixing roller 118 and the pressure roller 119 are not in the pressure contact state in S207 (No in S207), and if Δt is equal to or less than T2 in S208 (No in S208), the process proceeds to S210.

  In S210, when the intermediate transfer belt 101 is driven to rotate in S206, the rotation of the intermediate transfer belt 101 is finished when a predetermined time (for example, 30 seconds) has elapsed, and the primary transfer roller 114 is moved to the home position ( S211). Here, the home position is a state in which, for example, only the primary transfer roller 114 of Bk is in contact with the photosensitive drum 104 via the intermediate transfer belt 101. Further, depending on the usability of the image forming apparatus 100, a state where all four colors are in contact may be set as the home position, and a state where all the four colors are separated may be set as the home position.

  If the fixing roller 118 and the pressure roller 119 are rotated in S209 after the primary transfer roller 114 has been moved to the home position in S211, they are stopped when a predetermined time (for example, several minutes) has passed. , They are separated (S212). Thereafter, a normal startup process is executed in S213, and when the normal startup process is completed, the standby state is entered (S214), and the sequence is ended (S215). It should be noted that a normal start-up process may be executed before the rotation of the fixing roller 118 and the pressure roller 119 is completed, and this makes it possible to reduce the time until the transition to the standby state.

  As described above, according to the present invention, when the separation process cannot be performed due to a power failure on the primary transfer roller or the fixing roller that is performing the separation process at the time of normal shutdown, an appropriate processing operation at the time of return is performed. It is possible to prevent image degradation automatically.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

101 intermediate transfer belt
104 photoconductor drum
114 Primary transfer roller
118 fixing roller
119 pressure roller

Claims (16)

An image forming apparatus having a plurality of components pressed against each other during image formation,
Detection means for detecting a power failure;
When the detection means detects a power failure, storage means for storing information on the power failure;
When the power supply is restored from the power failure, if the power outage time calculated from the power outage information is less than the first predetermined time, a predetermined start-up process is executed, and the power outage time is If longer than the first predetermined time, the control means for executing rotation driving for the second predetermined time in a pressure contact state of the plurality of component parts before execution of the predetermined startup process;
An image forming apparatus comprising:   The image forming apparatus according to claim 1, wherein the predetermined start-up process includes density correction by generating a density correction pattern on the intermediate transfer belt and reading the pattern with a sensor.   The image forming apparatus according to claim 1, wherein the predetermined start-up process includes reading a color misregistration correction pattern with a sensor and performing color misregistration correction.   The image forming apparatus according to claim 1, wherein the power failure information includes a power failure and a power failure occurrence time.   5. The clock means according to claim 1, wherein the control means calculates a time during which the power outage occurred from the information on the power outage and the current time. The image forming apparatus described in 1.   The image forming apparatus according to claim 1, wherein the component includes an intermediate transfer belt, a photosensitive drum, and a primary transfer roller.   After the second predetermined time has elapsed, the rotational drive of the intermediate transfer belt is terminated, and only the primary transfer roller is moved to the home position where it contacts the photosensitive drum via the intermediate transfer belt. The image forming apparatus according to claim 6.   The image forming apparatus according to claim 1, wherein the component includes a pressure roller and a fixing roller.   The image forming apparatus according to claim 8, wherein after the second predetermined time has elapsed, the rotational driving of the pressure roller and the fixing roller is stopped and separated.   The image forming apparatus according to claim 1, wherein the time during which the power failure has occurred is a difference between a time when the power failure occurs and a time when the power supply is restored. An image forming apparatus having first and second components that are pressed against each other during image formation and separated from each other when stopped,
Detection means for detecting a power failure;
When the detection means detects a power failure, storage means for storing information on the power failure;
If the power failure time calculated from the power failure information is equal to or longer than the first predetermined time when the power supply is restored from the power failure, the first component is in a pressure contact state for a second predetermined time. Rotational drive,
If the power outage time is equal to or longer than a third predetermined time, control means for causing the second component to perform rotational driving for a fourth predetermined time in a pressure contact state;
An image forming apparatus comprising: The first component is an intermediate transfer belt, a photosensitive drum, and a primary transfer roller,
The image forming apparatus according to claim 11, wherein the second component is a pressure roller and a fixing roller.   The image according to any one of claims 11 to 12, wherein the control unit causes the rotation drive of the first component and the rotation drive of the second component to be executed in parallel. Forming equipment. A control method for an image forming apparatus, comprising: a plurality of components that are pressed against each other during image formation and spaced apart from each other when stopped; and a storage unit,
A detection process to detect a power outage;
When a power failure is detected in the detection step, a storage step of storing information on the power failure in the storage means;
If the power failure time calculated from the power failure information is equal to or longer than the first predetermined time when the power supply is restored from the power failure, the plurality of components are rotated in a second predetermined time in a pressure contact state. A control process for executing driving;
A control method for an image forming apparatus, comprising: A control method for an image forming apparatus, comprising first and second components that are pressed against each other during image formation and separated from each other when stopped, and a storage means,
A detection process to detect a power outage;
When a power failure is detected in the detection step, a storage step of storing information on the power failure in the storage means;
If the power failure time calculated from the power failure information is equal to or longer than the first predetermined time when the power supply is restored from the power failure, the first component is in a pressure contact state for a second predetermined time. Rotational drive,
If the power outage time is equal to or longer than a third predetermined time, a control step of causing the second component to rotate for a fourth predetermined time in a pressure contact state;
A control method for an image forming apparatus, comprising: A program for causing a computer to execute the control method for an image forming apparatus according to claim 14 or 15.

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