JP2018022091A - Image forming apparatus, and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that reduces power consumption in a power-saving mode.SOLUTION: An image forming apparatus 1 operates in a normal power mode and a power-saving mode. A main body of the image forming apparatus 1 is provided with a front door 22 and a right door 23. When any one of the doors is opened in the power-saving mode, the image forming apparatus 1 returns to the normal power mode. The image forming apparatus 1 includes a front door sensor 31 that detects opening/closing of the front door 22, a double doors sensor 32 that detects opening/closing of the double doors, and a right door sensor 33 that detects opening/closing of the right door 23. The front door sensor 31 and the right door sensor 33 operate in the normal power mode, and the double doors sensor 32 operates irrespective of the power modes. When detecting any one of the front door 22 and the right door 23 being opened in the power-saving mode by the double doors sensor 32, the image forming apparatus 1 switches the power mode to the normal power mode and operates.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image forming apparatus such as a printer, a copier, and a multifunction machine.

  With increasing environmental awareness, there is an increasing demand for power saving in image forming apparatuses. Therefore, some image forming apparatuses automatically reduce the power consumption during standby by automatically switching the power mode from the normal power mode to the power saving mode after a predetermined time has elapsed since the end of the image forming process or the user's operation. is there. The image forming apparatus returns from the power saving mode to the normal power mode when the user performs a predetermined operation using the operation unit or the like. Such an operation is a factor that reduces user convenience. In particular, an image forming apparatus that is set to frequently switch to the power saving mode increases the number of times that a user performs a predetermined operation, thus reducing usability.

  The image forming apparatus disclosed in Patent Document 1 returns to the normal power mode with the preparation for the image forming process as a trigger when waiting in the power saving mode. This image forming apparatus detects a change in the state of a unit that can be attached / detached or moved by a user in the power saving mode (opening / closing of a paper cassette, opening / closing of a door, etc.) with an optical sensor, and returns to the normal power mode using this as a trigger. Although a plurality of optical sensors are provided, peripheral components of the optical sensors are reduced by using a common power source for the plurality of optical sensors.

JP 2005-275154 A

  The plurality of optical sensors are provided corresponding to each of the units in which the image forming apparatus can be attached or detached. Therefore, the number of optical sensors themselves cannot be reduced. Further, since the optical sensor needs to operate even in the power saving mode, extra power consumption occurs even in the power saving mode.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus that reduces power consumption in a power saving mode.

  The image forming apparatus of the present invention is an image forming apparatus that operates in a first power mode and a second power mode that consumes less power than the first power mode. A plurality of components serving as triggers for switching from the second power mode to the first power mode, and power is supplied in the second power mode to detect the state of two or more components Power is supplied in a single first detection means and in the first power mode, power is not supplied in the second power mode, provided corresponding to the plurality of components, the first In the power mode, a plurality of second detection means for detecting the state of the corresponding component part, and the state in which the first detection means is two or more of the component parts in the second power mode When a change is detected, the power mode And a control unit that switches to the first power mode and identifies a state change of each of the two or more components based on detection results of the plurality of second detection units. .

  According to the present invention, only the first detection unit operates in the second power mode, and the power mode is switched from the second power mode to the first power mode according to the detection result of the first power mode. Therefore, it is possible to reduce power consumption by reducing the number of detection means in the second mode.

1 is an overall configuration diagram of an image forming apparatus. The arrangement example figure of an optical sensor. Explanatory drawing of a both door sensor. Truth table for judging opening and closing of the front door and the right door. The block diagram of a control system. The timing chart of the state transition of each power supply and each sensor. The flowchart showing the process at the time of electric power mode change.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 1 is an overall configuration diagram of an image forming apparatus according to the present exemplary embodiment. The image forming apparatus 1 includes an image reading unit 2 that reads a document image from a document D, an image forming unit 3 that forms an image on a sheet S, and an operation unit 210 that is a user interface. In the present embodiment, toner that is an example of a developer is used as a color material for image formation. The operation unit 210 includes various buttons that accept input of instructions from the display and the user.

  A document table 4 made of a transparent glass plate is provided above the image reading unit 2. The user places the document D at a predetermined position on the document table 4 with the image surface facing downward, and then presses and fixes the document D with the document crimping plate 5. An optical system having a lamp 6 that illuminates the document D and reflecting mirrors 8, 9, and 10 for guiding a light image of the illuminated document D to the image processing unit 7 is provided below the document table 4. Yes. The lamp 6 and the reflection mirrors 8, 9, and 10 move at a predetermined speed to scan the document D. The image processing unit 7 generates image data based on the optical image of the document D.

  The image forming unit 3 includes a photosensitive drum 11, a charging roller 12, a rotary developing unit 13, an intermediate transfer belt 14, a transfer roller 15, a cleaner 16, a laser unit 17, a paper cassette 18, a fixing device 19, and a discharge roller pair 21. .

  The charging roller 12 uniformly charges the surface of the photosensitive drum 11 before laser light irradiation. The laser unit 17 irradiates light on the surface of the photosensitive drum 11 charged based on the image data generated by the image processing unit 7 to form an electrostatic latent image. The rotary developing unit 13 attaches magenta (M), cyan (C), yellow (Y), and black (K) color toners to the electrostatic latent image formed on the surface of the photosensitive drum 11 to form a toner image. Form.

  The rotary developing unit 13 employs a rotary developing system, and includes a developing device 13K, a developing device 13Y, a developing device 13M, and a developing device 13C, and can be rotated by a motor (not shown). The developing device 13K develops a black electrostatic latent image, the developing device 13Y develops a yellow electrostatic latent image, the developing device 13M develops a magenta electrostatic latent image, and the developing device 13C develops a cyan electrostatic latent image. Used. When a monochrome toner image is formed on the photosensitive drum 11, the developing device 13 </ b> K rotates and moves to a developing position close to the photosensitive drum 11 for development. Similarly, when a full-color toner image is formed, developing devices 13Y to 13K are sequentially arranged at the developing position by the rotation of the rotary developing unit 13, and development is performed in order for each color.

  The toner image formed on the surface of the photosensitive drum 11 is transferred to the intermediate transfer belt 14. The cleaner 16 removes the toner remaining on the photosensitive drum 11 after the toner image is transferred. The transfer roller 15 transfers the toner image on the intermediate transfer belt 14 to the paper S fed from the paper cassette 18 or the manual feed tray 50. The fixing device 19 fixes the toner image on the conveyed paper S by heating and pressurizing. The sheet S on which the toner image is fixed in the fixing device 19 is discharged from the image forming apparatus 1 by the discharge roller pair 21.

  The image forming apparatus 1 has two power modes, a normal power mode and a power saving mode. In the normal power mode, the image forming apparatus 1 stands by while energizing each unit in the image forming apparatus 1 in order to quickly cope with image forming processing such as copying and printing. In the power saving mode, the image forming apparatus 1 leaves a job reception function such as reception of the operation unit 210 and facsimile, and stands by while stopping energization to other parts that do not require operation. Therefore, the power consumption in the power saving mode is smaller than the power consumption in the normal power mode.

  In order to reduce the power consumption of the image forming apparatus 1, it is better to keep the standby time in the power saving mode as long as possible. Switching from the normal power mode to the power saving mode can be performed at an arbitrary timing by the user operating the operation unit 210. When the user does not perform an operation on the operation unit 210, the image forming apparatus 1 automatically switches from the normal power mode to the power saving mode after a predetermined time has elapsed from the end of the image forming process or the end of the user operation. Switches. The image forming apparatus 1 returns from the power saving mode to the normal power mode by detecting a change in the state of a detachable or movable unit by the user (opening / closing of the paper cassette 18, opening / closing of a door provided in the main body, etc.).

  FIG. 2 is an exemplary illustration of an arrangement of optical sensors for detecting a change in the state of a unit that is detachable or movable by a user provided in the image forming apparatus 1. Here, a door provided in the main body of the image forming apparatus 1 will be described as an example of a unit that can be attached or detached or moved by the user.

  The image forming apparatus 1 includes a front door 22 that can be opened and closed on the main body so that a user can access the rotary developing unit 13 and the photosensitive drum 11. The image forming apparatus 1 also includes a right door 23 that can be opened and closed on the main body so that the user can access the intermediate transfer belt 14, the fixing device 19, and the paper S when the paper S is jammed by the discharge roller pair 21. The image forming apparatus 1 includes an optical sensor for detecting opening and closing of the front door 22 and the right door 23. In the present embodiment, the image forming apparatus 1 includes a front door sensor 31 as an optical sensor for detecting opening and closing of the front door 22. The image forming apparatus 1 includes a door sensor 32 as a single optical sensor for detecting that at least one of the front door 22 and the right door 23 is open. The image forming apparatus 1 includes a right door sensor 33 as an optical sensor for detecting opening and closing of the right door 23. The front door sensor 31, the both door sensors 32, and the right door sensor 33 may have any configuration as long as they can detect opening and closing of doors in addition to optical sensors such as a photo interrupter. . In the present embodiment, the optical sensor is turned off when the door is open, and the optical sensor is turned on when the door is closed.

  FIG. 3 is an explanatory diagram of the door sensor 32. Both door sensors 32 have a mechanical mechanism that does not turn on because the mechanical link does not operate when pressed from one of the doors, and turns on when pressed from both the front door 22 and the right door 23. Have. That is, the both door sensors 32 are turned off when one of the front door 22 and the right door 23 is open, and are turned on when both are closed. However, the door sensor 32 cannot identify which of the front door 22 and the right door 23 is opened or closed.

  FIG. 4 is a truth table for determining opening / closing of the front door 22 and the right door 23 in the normal power mode. This truth table represents the relationship between the detection results of the front door sensor 31, the door sensors 32, and the right door sensor 33 and the opening and closing of each door. In FIG. 4, “front door open” indicates that the front door 22 is open and the right door 23 is closed. “Right door open” indicates that the right door 23 is open and the front door 22 is closed. “Both doors open” indicates a state in which both the front door 22 and the right door 23 are open. “Both doors closed” indicates a state in which both the front door 22 and the right door 23 are closed. The parentheses indicate the state in the power saving mode. As will be described later, in the power saving mode, power is not supplied to the front door sensor 31 and the right door sensor 33, and the outputs of the front door sensor 31 and the right door sensor 33 are turned off regardless of the open / closed state of each door. Yes.

  When only the front door 22 is open, in the normal power mode, the front door sensor 31 and both door sensors 32 are turned off, and the right door sensor 33 is turned on. Although details will be described later, when the front door 22 is opened during the power saving mode, the detection result of the door sensors 32 is turned off to indicate that either the front door 22 or the right door 23 is opened, and this is used as a trigger. The image forming apparatus 1 returns from the power saving mode to the normal power mode. Since the right door 23 remains closed, the right door sensor 33 is turned on when the normal power mode is restored.

  When only the right door 23 is open, in the normal power mode, both the door sensor 32 and the right door sensor 33 are turned off, and the front door sensor 31 is turned on. When the right door 23 is opened during the power saving mode, the image forming apparatus 1 returns from the power saving mode to the normal power mode, similarly to the operation when the front door 22 is opened. Since the front door 22 remains closed, the front door sensor 31 is turned on when returning to the normal power mode.

  When both the front door 22 and the right door 23 are open, the front door sensor 31, the door sensor 32, and the right door sensor 33 are all turned off in the normal power mode. When both the front door 22 and the right door 23 are closed, the front door sensor 31, the both door sensors 32, and the right door sensor 33 are all turned on in the normal power mode.

  FIG. 5 is a configuration diagram of a control system that controls the operation of the image forming apparatus 1. This control system represents a configuration for controlling power supply when the power mode of the image forming apparatus 1 is switched, and a configuration for performing other controls such as image forming processing is omitted. As the control system, a load control unit 112 and a main control unit 113 are provided. The main control unit 113 operates with power supplied from the first power supply 201. The load control unit 112 operates with power supplied from the second power source 202.

  The main control unit 113 includes a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a LAN control unit 103, and a FAX control unit 104. The CPU 101 controls the operation of the image forming apparatus 1 by executing a computer program using the RAM 102 as a work area. The computer program is stored in a ROM (Read Only Memory) or storage (not shown). The RAM 102 is used for temporary data storage during the operation of the image forming apparatus 1. Since the RAM 102 is volatile, data cannot be retained if power supply is interrupted. The FAX control unit 104 realizes a facsimile function by the image forming apparatus 1 and controls transmission / reception of data via a public line. The LAN control unit 103 controls data transmission / reception with an external network such as a LAN (Local Area Network).

  The load control unit 112 includes an HDD (Hard Disk Drive) 108, a sensor control unit 109, a drive control unit 107, and a UI control unit 105. The HDD 108 is a mass storage device that stores various data such as print data and computer programs executed by the CPU 101. The HDD 108 transmits / receives data to / from each unit of the main control unit 113 via the system bus 114.

  The sensor control unit 109, the drive control unit 107, and the UI control unit 105 are each connected to the main control unit 113 through a dedicated bus. The sensor control unit 109 monitors the states of sensors such as the front door sensor 31, the both door sensors 32, and the right door sensor 33 in accordance with the control of the main control unit 113. The sensor control unit 109 transmits the detection result of each sensor to the main control unit 113. Note that the door sensor 32 also directly transmits the detection result to the main control unit 113. The drive control unit 107 controls the operation of the drive unit 106 according to the control of the main control unit 113, thereby driving and controlling various rollers provided in the image forming apparatus 1. The UI control unit 105 controls the operation unit 210. The UI control unit 105 displays various information on the display of the operation unit 210 in accordance with the control of the main control unit 113. The UI control unit 105 receives input of instructions from the user through various buttons of the operation unit 210 and transmits the input to the main control unit 113. The main control unit acquires a user instruction via the UI control unit 105.

  The first power source 201 converts the AC power supplied from the AC power source into DC power regardless of the power mode (normal power mode, power saving mode) of the image forming apparatus 1, and the subsequent device (main control unit 113). And the door sensor 32). Therefore, the main control unit 113 and the door sensor 32 always operate regardless of the power mode. The main control unit 113 monitors the detection result of the door sensor 32 during the power saving mode. When the main control unit 113 detects that at least one of the front door 22 and the right door 23 is opened based on the detection result of the door sensor 32 during the power saving mode, the main control unit 113 changes the power mode from the power saving mode to the normal power mode. Switch to. Therefore, the detection results of the door sensors 32 are directly input to the main control unit 113 without going through the load control unit 112.

  The second power source 202 converts the AC power supplied from the AC power source into DC power only when the power mode of the image forming apparatus 1 is the normal power mode, and the subsequent device (the load control unit 112, the front door sensor). 31 and the right door sensor 33). Therefore, the load control unit 112, the front door sensor 31, and the right door sensor 33 operate only in the normal power mode, and do not operate during the power saving mode.

  The main control unit 113 causes the first power supply 201 and the second power supply 202 to supply power to the subsequent apparatus in the normal power mode, causes the first power supply 201 to supply power to the subsequent apparatus in the power saving mode, and the second power supply. 202 causes power to be supplied to a subsequent device. Thereby, only the door sensor 32 operates in the power saving mode, and the front door sensor 31, the door sensor 32, and the right door sensor 33 all operate in the normal power mode. Therefore, the main control unit 113 cannot individually detect the opening / closing states of the front door 22 and the right door 23 during the power saving mode, but can individually detect them during the normal power mode.

  When the main control unit 113 returns the power mode to the normal power mode because the both door sensors 32 are turned off in the power saving mode, the front door sensor 31 and the right door sensor 33 are turned off with a time difference. become. Both door sensors 32 monitor the opening and closing of a plurality of doors (front door 22, right door 23) during the power saving mode. That is, during the power saving mode, one sensor monitors the opening and closing of a plurality of doors. Therefore, the number of sensors operating in the power saving mode can be reduced as compared with the conventional case, and further power saving in the power saving mode can be realized.

  FIG. 6 is a timing chart of state transition of each power source and each sensor according to the power mode.

  The main control unit 113 switches the power mode from the normal power mode to the power saving mode after elapse of a predetermined time from an instruction from the operation unit 210 or image formation processing or the end of the user operation. In this case, the main control unit 113 causes the second power source 202 to block power supply. The front door sensor 31 and the right door sensor 33 stop operating. Both door sensors 32 continue to operate.

  When the right door 23 is opened during the power saving mode, the detection result of both the door sensors 32 changes, and the main control unit 113 detects that at least one of the front door 22 and the right door 23 is opened. Thus, the main control unit 113 returns the power mode from the power saving mode to the normal power mode. For this purpose, the main control unit 113 causes the second power source 202 to resume supplying power. In order for the second power source 202 to resume power supply, the front door sensor 31 and the right door sensor 33 resume operation.

When the power mode is switched to the normal power mode, the opening / closing monitoring of the front door 22 and the right door 23 by the front door sensor 31 and the right door sensor 33 is resumed. The main control unit 113 detects opening / closing of the front door 22 and the right door 23 based on detection results of the front door sensor 31 and the right door sensor 33. Here, since the right door 23 is open, the detection result of the right door sensor 33 is turned off, and the detection result of the front door sensor 31 is turned on. The main control unit 113 detects that the right door 23 is opened based on detection results of the front door sensor 31 and the right door sensor 33.
When the front door 22 is opened during the power saving mode, when the power mode returns to the normal power mode, the detection result of the front door sensor 31 is turned off and the detection result of the right door sensor 33 is turned on. Become. Therefore, the main control unit 113 detects that the front door 22 is opened. When both the front door 22 and the right door 23 are opened during the power saving mode, when the power mode returns to the normal power mode, the detection results of the front door sensor 31 and the right door sensor 33 are both turned off. . Therefore, the main control unit 113 detects that both the front door 22 and the right door 23 are opened.

  The main control unit 113 displays that the door is open on the display of the operation unit 210 and instructs the user to close the door. In FIG. 6, the main control unit 113 displays on the display of the operation unit 210 that the right door 23 is open. When the user closes the door (the right door 23) according to the display on the operation unit 210, the detection result of the right door sensor 33 changes. The main control unit 113 detects that the right door 23 is closed based on the detection result of the right door sensor 33. When the main control unit 113 detects that the right door 23 is closed, the main control unit 113 ends the display on the operation unit 210.

  FIG. 7 is a flowchart showing processing related to the power mode and opening / closing of the door in the image forming apparatus 1. Here, a process of switching to the normal power mode when at least one of the front door 22 and the right door 23 is opened during the power saving mode will be described.

  The main control unit 113 determines whether to switch the power mode of the image forming apparatus 1 from the normal power mode to the power saving mode (S100). When not switching to the power saving mode (S100: N), the main control unit 113 controls the image forming apparatus 1 in the normal power mode, and thus advances the process to S103. When switching to the power saving mode (S100: Y), the main control unit 113 causes the second power source 202 to cut off the power supply and switches the power mode of the image forming apparatus 1 to the power saving mode.

  The main control unit 113 determines whether at least one of the front door 22 and the right door 23 is open during standby in the power saving mode (S101). The main control unit 113 determines whether at least one of the front door 22 and the right door 23 is opened based on the detection results of the both door sensors 32. The main control unit 113 repeats this determination until it detects that at least one of the front door 22 and the right door 23 is opened (S101: N). When at least one of the front door 22 and the right door 23 is opened (S101: Y), the main control unit 113 returns the power mode of the image forming apparatus 1 to the normal power mode (S102). The main control unit 113 restarts the power supply to the second power source 202 and switches the power mode of the image forming apparatus 1 to the normal power mode. The main control unit 113 identifies the opened door after switching to the normal power mode.

  The main control unit 113 determines whether or not the right door 23 has been opened from the detection result of the right door sensor 33 whose power supply has been resumed (S103). When the right door 23 is open (S103: Y), the main control unit 113 displays that the right door 23 is open on the display of the operation unit 210 and instructs the user to close the right door 23. . Here, the main control unit 113 displays “the right door is open” on the display of the operation unit 210 (S104). After the display, the main control unit 113 determines whether the right door 23 is closed from the detection result of the right door sensor 33 (S105). Until the right door 23 is closed, the main control unit 113 continues the display of S104 (S105: N). When the main control unit 113 detects that the right door 23 is closed by the right door sensor 33 (S105: Y), the main control unit 113 turns off the display of “the right door is open” (S106).

  When the right door 23 is closed in the process of S103 (S103: N), the main control unit 113 determines whether or not the front door 22 is opened from the detection result of the front door sensor 31 whose power supply has been resumed. (S107). When the front door 22 is open (S107: Y), the main control unit 113 displays that the front door 22 is open on the display of the operation unit 210 and instructs the user to close the front door 22. . Here, the main control unit 113 displays “the front door is open” on the display of the operation unit 210 (S108). After the display, the main control unit 113 determines whether or not the front door 22 is closed from the detection result of the front door sensor 31 (S109). The main control unit 113 continues displaying S107 until the front door 22 is closed (S109: N). When the main control unit 113 detects that the front door 22 is closed by the front door sensor 31 (S109: Y), the main control unit 113 turns off the display of “the front door is open” (S110).

  When the front door 22 is closed in the process of S106 (S107: N), both the front door 22 and the right door 23 are closed. This means that the door is closed between the time when it is determined that the door is open in the process of S101 and the time when the process of S103 or S107. In this case, the main control unit 113 repeats the processing from S100 again.

  Thereafter, the main control unit 113 determines whether both the front door 22 and the right door 23 are closed based on the detection results of the both door sensors 32 (S111). When at least one of the front door 22 and the right door 23 is open (S111: N), the main control unit 113 repeatedly performs the processes after S103. When both the front door 22 and the right door 23 are closed (S111: Y), the main control unit 113 repeats the processing from S100 again.

  As described above, the image forming apparatus 1 according to the present embodiment detects opening and closing of two or more doors with one sensor during the power saving mode. Therefore, the number of sensors monitored during the power saving mode can be reduced as compared with the conventional configuration in which a plurality of sensors are monitored corresponding to each door even in the power saving mode. Therefore, power consumption during the power saving mode is reduced. In the present embodiment, the detection target of the sensor has been described with a plurality of doors, but sensors provided in components other than the door that trigger the switching of the power mode from the power saving mode to the normal power mode when the state changes. If so, the number and power consumption can be reduced similarly. Such components include a unit such as a paper cassette 18 that can be attached to and detached from the image forming apparatus 1.

Claims (8)

An image forming apparatus that operates in a first power mode and a second power mode that consumes less power than the first power mode,
A plurality of components that trigger a switch from the second power mode to the first power mode by changing the state;
A single first detection means for supplying power in the second power mode and detecting the state of two or more of the components;
Power is supplied in the first power mode, power is not supplied in the second power mode, provided corresponding to the plurality of components, and in the first power mode, the corresponding component A plurality of second detection means for detecting a state;
When the first detection means detects a change in the state of any of the two or more components in the second power mode, the power mode is switched to the first power mode, and the plurality of second detections are performed. And a control unit that identifies a state change of each of the two or more constituent parts based on a detection result of the unit,
Image forming apparatus. A first power source for supplying power in both the first power mode and the second power mode;
A second power source that supplies power in the first power mode and shuts off the power supply in the second power mode, and
The first detection means is supplied with power from the first power source,
The plurality of second detection means are supplied with electric power from the second power source,
The image forming apparatus according to claim 1. The plurality of component parts are a plurality of doors that can be opened and closed on the main body of the image forming apparatus,
The first detecting means detects opening and closing of the two or more doors;
The second detection means detects opening and closing of the corresponding door,
The image forming apparatus according to claim 1. The control means switches the power mode to the first power mode when detecting that at least one of the two or more doors is opened from the detection result of the first detection means in the second power mode. It is characterized by
The image forming apparatus according to claim 3. The control means specifies the opened door from the detection result of the second detection means after switching the power mode to the first power mode.
The image forming apparatus according to claim 3 or 4. The control means instructs the user to close the identified opened door,
The image forming apparatus according to claim 5. Furthermore, it has a display means for displaying information,
The control means causes the display means to display prompting the user to close the opened door specified by the user,
The image forming apparatus according to claim 6. Operating in a first power mode and a second power mode that consumes less power than the first power mode;
A plurality of components that trigger a switch from the second power mode to the first power mode by changing the state;
A single first detection means for supplying power in the second power mode and detecting the state of two or more of the components;
Power is supplied in the first power mode, power is not supplied in the second power mode, provided corresponding to the plurality of components, and in the first power mode, the corresponding component A control method executed by an image forming apparatus comprising: a plurality of second detection means for detecting a state;
When the first detection means detects a change in the state of any of the two or more components in the second power mode, the power mode is switched to the first power mode, and the plurality of second detections are performed. Based on the detection result of the means, each state change of the two or more constituent parts is specified,
A method for controlling an image forming apparatus.

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