JP2021035268A - Image forming apparatus - Google Patents

Abstract

To provide an image forming apparatus that can execute abnormal determination of a fan motor at an appropriate timing.SOLUTION: An image forming apparatus comprises: a fan motor that is provided in an image forming unit; and a control unit that drives the fan motor. The control unit includes a current detection unit that detects a current flowing in the fan motor, and an abnormality determination unit that determines an abnormality in the fan motor based on the current detection unit. The abnormality determination unit determines the abnormality in the fan motor after the lapse of a predetermined period from the start-up of the fan motor.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to an image forming apparatus equipped with a fan motor.

The image forming apparatus is equipped with a fan motor to dissipate heat inside the apparatus.

It is generally known that an inrush current is generated when driving a fan motor, and a method of adjusting the rotation speed of the fan motor in order to suppress the current has been proposed (see Patent Document 1). ..

On the other hand, conventionally, a method of detecting an abnormality of the fan motor by detecting the drive current of the fan motor has also been adopted.

Japanese Unexamined Patent Publication No. 2001-177984

In this respect, when the rotation speed of the fan motor is adjusted, the drive current of the fan motor is not in a normal state, so that an abnormality may be erroneously detected.

The present disclosure has been made in view of the above background, and an object of the present disclosure is to provide an image forming apparatus capable of executing an abnormality determination of a fan motor at an appropriate timing.

An image forming apparatus according to a certain aspect includes a fan motor provided in the image forming unit and a control unit for driving the fan motor. The control unit includes a current detection unit that detects the current flowing through the fan motor, and an abnormality determination unit that determines an abnormality of the fan motor based on the current detection unit. The abnormality determination unit determines an abnormality of the fan motor after a lapse of a predetermined period from the start of the fan motor.

Preferably, the control unit further includes a motor control unit that executes deceleration control when the fan motor is started.

Preferably, the motor control unit executes full speed control after deceleration control for a certain period of time when starting the fan motor.

Preferably, the abnormality determination unit determines the abnormality of the fan motor during the period of full speed control of the fan motor.

Preferably, the motor control unit executes full speed control after deceleration control for a certain period of time when restarting the fan motor immediately after the fan motor is stopped, and the abnormality determination unit restarts the fan motor. After the lapse of a predetermined period, the abnormality of the fan motor is judged.

Preferably, the abnormality determination unit determines the abnormality of the fan motor when the abnormality value of the current is detected a plurality of times during the detection period based on the detection result of the current detection unit.

Preferably, the abnormality determination unit determines the abnormality of the fan motor when the ratio of the number of detections of the abnormal value of the current to the plurality of detections in the detection period based on the detection result of the current detection unit is equal to or more than a predetermined ratio. To judge.

Preferably, the control unit further includes a voltage detection unit that detects a voltage input to the fan motor, and a voltage determination unit that determines whether or not the voltage detected by the voltage detection unit is equal to or lower than the reference voltage. The motor control unit does not execute deceleration control when the voltage detected by the voltage detection unit is equal to or less than the reference voltage based on the determination result of the voltage determination unit.

Preferably, the control unit further includes a voltage detection unit that detects a voltage input to the fan motor, and a voltage determination unit that determines whether or not the voltage detected by the voltage detection unit is equal to or lower than the reference voltage. Based on the determination result of the voltage determination unit, the abnormality determination unit determines the abnormality of the fan motor after the lapse of the first predetermined period when the voltage detected by the voltage detection unit is equal to or less than the reference voltage.

Preferably, based on the determination result of the voltage determination unit, the abnormality determination unit, when the voltage detected by the voltage detection unit is larger than the reference voltage, after the lapse of the second predetermined period longer than the first predetermined period. , Judge the abnormality of the fan motor.

Preferably, the abnormality determination unit determines the abnormality of the fan motor after a lapse of a predetermined period from the start of the fan motor, and when the fan motor is restarted immediately after the fan motor is stopped, the period is shorter than the predetermined period. After the lapse of time, the abnormality of the fan motor is judged.

Preferably, the motor control unit executes full-speed control without deceleration control when restarting the fan motor immediately after the fan motor is stopped, and the abnormality determination unit starts from a predetermined period after restarting the fan motor. After a short period of time, the fan motor is judged to be abnormal.

Preferably, the image forming apparatus further includes a shutter mechanism capable of adjusting the amount of air blown from the fan motor. The control unit further includes a timing adjustment unit that adjusts a predetermined period based on the adjustment amount of the shutter mechanism.

Preferably, the shutter mechanism reduces the amount of air blown out when the fan motor is started, and the control unit further includes a motor control unit that performs full speed control when the fan motor is started.

Preferably, the control unit further includes a lock abnormality determination unit that determines a lock abnormality of the fan motor.

Preferably, the lock abnormality determination unit determines the lock abnormality of the fan motor before a predetermined period.

Preferably, when the abnormality determination unit determines the lock abnormality of the fan motor by the lock abnormality determination unit, the abnormality determination unit does not determine the abnormality of the fan motor.

The above and other objectives, features, aspects and advantages of the invention will become apparent from the following detailed description of the invention as understood in connection with the accompanying drawings.

It is a figure explaining the appearance of the image forming apparatus 1 according to Embodiment 1. FIG. It is a figure explaining the structure of the image forming apparatus 1 according to Embodiment 1. FIG. It is a block diagram which shows the main hardware composition of the image forming apparatus 1 according to Embodiment 1. FIG. It is a figure explaining the control object of the control apparatus 101 according to Embodiment 1. FIG. It is a figure explaining the functional block of the image forming apparatus 1 according to Embodiment 1. FIG. It is a figure explaining the electric current at the time of starting the fan motor 62 of the image forming apparatus 1 according to Embodiment 1. FIG. It is a figure explaining the timing of detecting the abnormality determination of the abnormality determination unit 132 according to Embodiment 1. FIG. It is a figure explaining the flow of the abnormality detection start of the abnormality determination part 132 according to Embodiment 1. FIG. It is a figure explaining the electric current at the time of starting of the fan motor 62 according to the modification 1 of Embodiment 1. FIG. It is a figure explaining the timing of detecting the abnormality determination of the abnormality determination unit 132 according to the modification 1 of Embodiment 1. FIG. It is a figure explaining the flow of the abnormality detection start of the abnormality determination part 132 according to the modification 1 of Embodiment 1. FIG. It is a figure explaining the flow of the abnormality detection start of the abnormality determination part 132 according to the modification 2 of Embodiment 1. FIG. It is a figure explaining the current at the time of starting of the fan motor 62 according to the modification 2 of Embodiment 1. FIG. It is a figure explaining the flow of the abnormality detection start of the abnormality determination part 132 according to the modification 3 of Embodiment 1. FIG. It is a figure explaining the current at the time of starting of the fan motor 62 according to the modification 3 of Embodiment 1. FIG. It is a figure explaining the current at the time of starting and restarting the fan motor 62 of the image forming apparatus 1 according to the modification 4 of Embodiment 1. FIG. It is a figure explaining the timing of detecting the abnormality determination of the abnormality determination unit 132 according to the embodiment. It is a figure explaining the flow of the abnormality detection start of the abnormality determination part 132 according to the modification 4 of Embodiment 1. FIG. It is a figure explaining the current at the time of starting and restarting the fan motor 62 of the image forming apparatus 1 according to the modification 5 of Embodiment 1. FIG. It is a figure explaining the timing of detecting the abnormality determination of the abnormality determination unit 132 according to the modification 5 of Embodiment 1. FIG. It is a figure explaining the flow of the abnormality detection start of the abnormality determination part 132 according to the modification 5 of Embodiment 1. FIG. It is a figure explaining the shutter mechanism according to Embodiment 2. FIG. It is a figure explaining the electric current at the time of starting the fan motor 62 of the image forming apparatus 1 according to Embodiment 2. FIG. It is a figure explaining the timing of detecting the abnormality determination of the abnormality determination unit 132 according to Embodiment 2. FIG.

Hereinafter, embodiments of the technical concept according to the present disclosure will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions are the same. Therefore, the detailed description of them will not be repeated.

In the following embodiments, the image forming apparatus includes, for example, an MFP, a printer, a copier, a facsimile, or the like.

(Embodiment 1)
[1. Configuration of image forming apparatus 1]
FIG. 1 is a diagram for explaining the appearance of the image forming apparatus 1 according to the first embodiment.

With reference to FIG. 1, as the image forming apparatus 1, the image forming apparatus 1 as a color printer is shown. Hereinafter, the image forming apparatus 1 as a color printer will be described, but the image forming apparatus 1 is not limited to the color printer. For example, the image forming apparatus 1 may be a monochrome printer, or may be a monochrome printer or a multifunction device of a color printer and a facsimile (so-called MFP (Multi Functional Peripheral)).

The image forming apparatus 1 includes a scanner 20 as an image reading unit and a printer 25 as an image forming unit. The scanner 20 is provided with an ADF (Auto Document Feeder) 24. The printer 25 is provided with a cassette 37 for storing paper.

The image forming apparatus 1 includes a display panel 105 for displaying various setting operations and information related to the image forming apparatus 1. The display panel 105 is provided on the front side of the image forming apparatus 1.

FIG. 2 is a diagram illustrating a configuration of an image forming apparatus 1 according to the first embodiment.

With reference to FIG. 2, a scanner 20 is provided on the upper part of the image forming apparatus 1. The scanner 20 includes a cover 21, a paper base 22, a tray 23, and an ADF 24. One end of the cover 21 is fixed to the paper base 22, and the cover 21 is configured to be openable and closable with the one end as a fulcrum. The operator can set the original on the paper base 22 by opening the cover 21. When the image forming apparatus 1 receives a scan instruction while the original is set on the paper base 22, the image forming apparatus 1 starts scanning the original set on the paper base 22. Further, when the image forming apparatus 1 receives a scan instruction with the originals set in the tray 23, the ADF 24 automatically reads the originals one by one.

The printer 25 includes image creation units 90Y, 90M, 90C, 90K, an IDC (Image Density Control) sensor 19, a transfer belt 30, a primary transfer roller 31, a transfer drive 32, a secondary transfer roller 33, and the like. The cassettes 37A to 37C, a driven roller 38, a driving roller 39, a timing roller 40, a cleaning unit 43, and a fixing device 60 are provided.

The image creation units 90Y, 90M, 90C, and 90K are arranged in order along the transfer belt 30. The image creation unit 90Y receives the toner supply from the toner bottle 15Y and forms a yellow (Y) toner image. The image creating unit 90M receives the toner supply from the toner bottle 15M and forms a toner image of magenta (M). The image creating unit 90C receives the toner supply from the toner bottle 15C and forms a toner image of cyan (C). The image creation unit 90K receives the toner supply from the toner bottle 15K and forms a black (BK) toner image.

The image creating units 90Y, 90M, 90C, and 90K are arranged along the transfer belt 30 in the order of rotation of the transfer belt 30, respectively. The image creation units 90Y, 90M, 90C, and 90K each include a photoconductor 10, a charging device 11, an exposure device 13, a developing device 14, a cleaning unit 17, and a toner sensor 18, which are rotatably configured. Be prepared.

After the image creation units 90Y, 90M, 90C, and 90K operate as described above, the transfer of the transfer drive 32 causes a yellow (Y) toner image, a magenta (M) toner image, and a cyan (C) toner image. The toner image and the black (BK) toner image are sequentially superimposed and transferred from the photoconductor 10 to the transfer belt 30. As a result, a color toner image is formed on the transfer belt 30.

The IDC sensor 19 detects the density of the toner image formed on the transfer belt 30. Typically, the IDC sensor 19 is a light intensity sensor including a reflective photo sensor, which detects the reflected light intensity from the surface of the transfer belt 30.

The transfer belt 30 is stretched between the driven roller 38 and the driving roller 39. The drive roller 39 is connected to a motor (not shown). By controlling the motor, the drive roller 39 rotates. The transfer belt 30 and the driven roller 38 rotate in conjunction with the drive roller 39. As a result, the toner image on the transfer belt 30 is sent to the secondary transfer roller 33.

Papers of different sizes are set in each of the cassettes 37A to 37C. Paper is an example of a recording medium. The paper is fed one by one from any of the cassettes 37A to 37C to the secondary transfer roller 33 along the transport path 41 by the timing roller 40. The transfer voltage applied to the secondary transfer roller 33 is controlled according to the timing at which the paper is fed.

The secondary transfer roller 33 applies a transfer voltage having a polarity opposite to the charging polarity of the toner image to the paper being conveyed. As a result, the toner image is attracted from the transfer belt 30 to the secondary transfer roller 33, and the toner image on the transfer belt 30 is transferred. The timing of transferring the paper to the secondary transfer roller 33 is controlled by the timing roller 40 according to the position of the toner image on the transfer belt 30. As a result, the toner image on the transfer belt 30 is transferred to an appropriate position on the paper.

The fuser 60 pressurizes and heats the paper passing through the fuser 60. As a result, the toner image is fixed on the paper. After that, the paper is discharged to the tray 49.

The cleaning unit 43 collects the toner remaining on the surface of the transfer belt 30 after the toner image is transferred from the transfer belt 30 to the paper. The recovered toner is conveyed by a conveying screw (not shown) and stored in a waste toner container (not shown).

[2. Hardware configuration]
FIG. 3 is a block diagram showing a main hardware configuration of the image forming apparatus 1 according to the first embodiment.

An example of the hardware configuration of the image forming apparatus 1 will be described with reference to FIG.

In addition to the scanner 20 and the printer 25, the image forming apparatus 1 includes a control device 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, a network interface 104, a display panel 105, and a microphone 106. , The storage device 110 and the like.

The control device 101 is composed of, for example, at least one integrated circuit. An integrated circuit is composed of, for example, at least one CPU (Central Processing Unit), at least one ASIC (Application Specific Integrated Circuit), at least one FPGA (Field Programmable Gate Array), or a combination thereof.

The control device 101 controls the operation of the image forming device 1 by executing various programs such as the program 112 for adjusting the control parameters of the image forming device 1.

The control device 101 reads the program 112 from the storage device 110 into the RAM 103 based on the reception of the execution instruction of the program 112. The RAM 103 functions as a working memory and temporarily stores various data necessary for executing the program 112.

An antenna (not shown), a wireless module, or the like is connected to the network interface 104. The image forming apparatus 1 exchanges data with an external communication device via an antenna or a wireless module. External communication devices include, for example, mobile communication terminals such as smartphones, servers, and the like. The image forming apparatus 1 may be configured so that the program 112 can be downloaded from the server via the antenna.

The display panel 105 is composed of a display and a touch panel. The display and the touch panel are overlapped with each other, and an operation on the image forming apparatus 1 is received by a touch operation. Further, the display panel 105 can not only accept the setting operation but also provide various information to the user.

The storage device 110 is, for example, a hard disk, an SSD (Solid State Drive) or other storage device. The storage device 110 may be either a built-in type or an external type. The storage device 110 stores a program 112 or the like according to the present embodiment. However, the storage location of the program 112 is not limited to the storage device 110, and may be stored in the storage area of the control device 101 (for example, a cache or the like), the ROM 102, the RAM 103, an external device (for example, a server), or the like.

The program 112 may be provided as a part of any program, not as a stand-alone program. In this case, the control process according to the present embodiment is realized in cooperation with an arbitrary program. Even a program that does not include such a part of modules does not deviate from the purpose of the program 112 according to the present embodiment.

Further, some or all of the functions provided by the program 112 may be realized by dedicated hardware. Further, the image forming apparatus 1 may be configured in the form of a so-called cloud service in which at least one server executes a part of the processing of the program 112.

The microphone 106 accepts voice input.

[2.1 Control target]
FIG. 4 is a diagram illustrating a controlled object of the control device 101 according to the first embodiment.

As shown in FIG. 4, the control device 101 controls the fan motor 62. The fan motor 62 is provided in the fuser 60 as an example.

The power supply unit 64 receives an AC voltage from an external input power supply and supplies a DC voltage to various hardware. As an example, the power supply unit 64 supplies a DC voltage to the control device 101. The fan motor 62 receives a voltage supply via the control device 101.

The control device 101 operates by receiving the supply of the DC voltage output from the power supply unit 64, and also controls the fan motor 62. At that time, the control device 101 supplies the fan motor 62 with a voltage for driving the fan motor 62.

In this example, the fan motor 62 refers to a fan and a motor provided as an integrated type.

[3. Functional block]
FIG. 5 is a diagram illustrating a functional block of the image forming apparatus 1 according to the first embodiment.

With reference to FIG. 5, the control device 101 realizes a functional block that executes various functions by executing the program 112 stored in the storage device 110.

The control device 101 includes a current detection unit 130, an abnormality determination unit 132, a lock abnormality determination unit 134, a motor control unit 136, a voltage detection unit 138, a voltage determination unit 139, a timing adjustment unit 140, and a shutter mechanism. Includes the adjusting unit 142.

The current detection unit 130 detects the current (driving current) that flows when driving the fan motor 62.

The abnormality determination unit 132 determines an abnormality of the fan motor 62. In this example, the abnormality determination unit 132 determines an abnormality based on the amount of drive current flowing through the fan motor 62 detected by the current detection unit 130.

The lock abnormality determination unit 134 determines whether or not the fan motor 62 is locked. When the fan motor 62 is locked, it means that the fan is not rotating. If the fan does not rotate, a lock signal is output from the fan motor 62 to the control device 101. The lock abnormality determination unit 134 determines whether or not the fan motor 62 is locked based on whether or not the lock signal from the fan motor 62 is received.

The motor control unit 136 controls the operation of the fan motor 62.

The voltage detection unit 138 detects the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101.

The voltage determination unit 139 determines whether or not the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is equal to or higher than a predetermined reference voltage.

The timing adjusting unit 140 adjusts the timing of abnormality determination, which will be described later.

The shutter mechanism adjusting unit 142 adjusts the shutter mechanism described later.

FIG. 6 is a diagram illustrating a current at the time of starting the fan motor 62 of the image forming apparatus 1 according to the first embodiment.

As shown in FIG. 6, an inrush current flows when the fan motor 62 is started. In this example, the case where the current stabilizes in the vicinity of the elapse of about 3 seconds is shown.

Therefore, in the first embodiment, the abnormality of the fan motor 62 is determined during the period when the current is stable (in the normal state).

FIG. 7 is a diagram illustrating a timing for detecting an abnormality determination of the abnormality determination unit 132 according to the first embodiment.

As shown in FIG. 7, the motor control unit 136 executes control for driving the fan motor 62 at full speed at the time of starting.

The abnormality determination unit 132 determines an abnormality of the fan motor 62 after a predetermined period of time has elapsed (for example, after 3 seconds) after the start-up. Specifically, the abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

In this example, the abnormality determination unit 132 may determine as an abnormality when the current value detected by the current detection unit 130 is an abnormal value a plurality of times. For example, the abnormality determination unit 132 may detect a current value every 20 ms and determine that the current value is abnormal for N consecutive times (N ≧ 2). It is possible to ensure the reliability of the abnormality by making a judgment multiple times.

The lock abnormality determination unit 134 determines whether or not the fan motor 62 is locked after a lapse of a predetermined period (1 second as an example) after the start. Specifically, the lock abnormality determination unit 134 determines whether or not the lock signal from the fan motor 62 is received.

In this example, the lock abnormality determination unit 134 may determine that the fan motor 62 is locked multiple times as an abnormality. For example, the lock abnormality determination unit 134 may detect the lock signal and determine that the lock signal is abnormal when it is detected continuously for N seconds (N ≧ 2). It is possible to ensure the reliability of the abnormality by making a judgment multiple times.

Further, when the lock abnormality determination unit 134 determines that the abnormality has occurred, the abnormality determination unit 132 may not determine the abnormality because the abnormality has already occurred.

FIG. 8 is a diagram illustrating a flow for starting detection of an abnormality of the abnormality determination unit 132 according to the first embodiment.

As shown in FIG. 8, the control device 101 instructs the start of the fan motor (step S2). The motor control unit 136 instructs the fan motor 62 to start. For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the predetermined period has elapsed (step S4). Specifically, the abnormality determination unit 132 determines whether or not a predetermined period (3 seconds as an example) has elapsed since the activation.

In step S4, when the control device 101 determines that a predetermined period (3 seconds as an example) has elapsed (YES in step S4), the control device 101 starts abnormality detection (step S6). When the abnormality determination unit 132 determines that the predetermined period has elapsed, the abnormality determination unit 132 starts abnormality detection. The abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

By this process, the period in which the inrush current is generated immediately after the start of the fan motor 62 is removed, and the abnormality detection is started in the period in which the drive current in the normal state is generated. This enables highly reliable abnormality detection.

In this example, the case where the predetermined period is set to 3 seconds has been described, but the present invention is not limited to this, and any period can be set.

(Modification example 1)
In the first modification of the first embodiment, a method of suppressing the inrush current will be described. Specifically, in the first modification of the first embodiment, the deceleration control is executed for the fan motor 62 immediately after the start of the start.

FIG. 9 is a diagram illustrating a current at startup of the fan motor 62 according to the first modification of the first embodiment.

As shown in FIG. 9, an inrush current flows when the fan motor 62 is started. In this example, the case where the current stabilizes in the vicinity of the elapse of a predetermined period is shown. Further, in this example, the case where the inrush current is generated twice is shown.

In the first modification of the first embodiment, the deceleration control is executed for a certain period immediately after the start-up, and then the full speed control is executed.

The motor control unit 136 executes deceleration control on the fan motor 62 for a certain period (1 second as an example) immediately after the start-up. Then, the motor control unit 136 executes full-speed control after a certain period of time. Then, the abnormality determination unit 132 starts abnormality detection after the lapse of the first predetermined period (1.5 seconds as an example) during full speed control of the fan motor 62.

FIG. 10 is a diagram illustrating a timing for detecting an abnormality determination of the abnormality determination unit 132 according to the first modification of the first embodiment.

As shown in FIG. 10, in the first modification of the first embodiment, the deceleration control is executed for a certain period immediately after the start-up, and then the full-speed control is executed.

The motor control unit 136 executes deceleration control on the fan motor 62 for a certain period (1 second as an example) immediately after the start-up. Then, the motor control unit 136 executes full-speed control after a certain period of time. Then, the abnormality determination unit 132 starts abnormality detection after the lapse of the first predetermined period (1.5 seconds as an example) during full speed control of the fan motor 62.

The abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current. The abnormality determination unit 132 may determine as an abnormality when the current value detected by the current detection unit 130 a plurality of times is an abnormal value.

The lock abnormality determination unit 134 determines whether or not the fan motor 62 is locked after a lapse of a predetermined period (1 second as an example) after the start. Specifically, the lock abnormality determination unit 134 determines whether or not the lock signal from the fan motor 62 is received. The lock abnormality determination unit 134 may determine as an abnormality when it is determined that the fan motor 62 is locked a plurality of times.

FIG. 11 is a diagram illustrating a flow of starting abnormality detection of the abnormality determination unit 132 according to the first modification of the first embodiment.

As shown in FIG. 11, the control device 101 instructs the deceleration start of the fan motor 62 (step S3). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Next, the control device 101 determines whether or not a certain period of time has elapsed (step S5). Specifically, the motor control unit 136 determines whether or not a certain period (1 second as an example) has elapsed since the motor was started.

In step S5, when the control device 101 determines that a certain period of time has elapsed (YES in step S5), the control device 101 instructs the fan motor 62 to reach full speed (step S7). For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the first predetermined period has elapsed (step S9). Specifically, the abnormality determination unit 132 determines whether or not a first predetermined period (1.5 seconds as an example) has elapsed since the fan motor 62 operates at full speed.

Next, when the control device 101 determines that the first predetermined period has elapsed (YES in step S9), the control device 101 starts abnormality detection (step S11). When the abnormality determination unit 132 determines that the first predetermined period (1.5 seconds as an example) has elapsed, the abnormality detection unit 132 starts abnormality detection. Specifically, the abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

In the modified example of the first embodiment, the motor control unit 136 can suppress the amount of inrush current by controlling the deceleration of the fan motor 62 immediately after the start of operation. An inrush current is also generated when the fan motor 62 is controlled at full speed, but since it is a change after the deceleration control is performed, it is possible to suppress an increase in the amount of the inrush current. The abnormality determination unit 132 determines whether or not an abnormality has occurred in the fan motor 62 during the period of full speed control. It is possible to shorten the period from when the inrush current is generated to when it stabilizes after the start of startup, and to accelerate the period when the drive current in the normal state is generated and start abnormality detection at an early stage. This enables highly reliable abnormality detection at an early stage.

(Modification 2)
In the first modification of the first embodiment, a case where the fan motor 62 is decelerated and then controlled at full speed during a certain period immediately after the start of the start is described.

In the second modification of the first embodiment, the case where the motor control unit 136 does not execute the deceleration control when the voltage input to the fan motor 62 is low will be described.

The voltage detection unit 138 detects the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101.

The voltage determination unit 139 determines whether or not the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is equal to or higher than a predetermined reference voltage.

When the motor control unit 136 determines as a determination result of the voltage determination unit 139 that the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is not equal to or higher than a predetermined reference voltage, the motor control unit 136 performs deceleration control. Execute full speed control without executing.

When the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is not equal to or higher than a predetermined reference voltage, that is, when the voltage is lower than the reference voltage, the inrush current is also reduced.

Therefore, when the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is not equal to or higher than a predetermined reference voltage, full-speed control is executed. The abnormality determination unit 132 determines an abnormality after a predetermined period of time has elapsed (for example, 2 seconds) after the fan motor 62 is controlled at full speed.

FIG. 12 is a diagram illustrating a flow of starting abnormality detection of the abnormality determination unit 132 according to the second modification of the first embodiment.

As shown in FIG. 12, the control device 101 confirms the voltage output from the power supply unit 64 to the fan motor 62 (step S0). Specifically, the voltage detection unit 138 detects the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101.

Next, the control device 101 determines whether or not the voltage output from the power supply unit 64 to the fan motor 62 is equal to or higher than the reference voltage (step S1). Specifically, the voltage determination unit 139 determines whether or not the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is equal to or higher than a predetermined reference voltage.

In step S1, when the control device 101 determines that the voltage output from the power supply unit 64 to the fan motor 62 is equal to or higher than the reference voltage (YES in step S1), the control device 101 instructs the deceleration start of the fan motor 62 (YES in step S1). Step S3). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Since the subsequent processing is the same flow as that described with reference to FIG. 11, the detailed description thereof will not be repeated.

On the other hand, in step S1, when the control device 101 determines that the voltage output from the power supply unit 64 to the fan motor 62 is not equal to or higher than the reference voltage (NO in step S1), the control device 101 instructs the fan motor 62 to start at full speed. (Step S8). The motor control unit 136 instructs the fan motor 62 to start at full speed.

Next, the control device 101 determines whether or not the predetermined period has elapsed (step S10). Specifically, the abnormality determination unit 132 determines whether or not a predetermined period (2 seconds as an example) has elapsed since the activation.

In step S10, when the control device 101 determines that the predetermined period has elapsed (YES in step S10), the control device 101 starts abnormality detection (step S11). When the abnormality determination unit 132 determines that a predetermined period (2 seconds as an example) has elapsed, the abnormality detection unit 132 starts abnormality detection. When the abnormality determination unit 132 determines that the predetermined period has elapsed, the abnormality determination unit 132 starts abnormality detection. The abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

FIG. 13 is a diagram illustrating a current at the time of starting the fan motor 62 according to the second modification of the first embodiment.

As shown in FIG. 13, an inrush current flows when the fan motor 62 is started.

In the second modification of the first embodiment, the voltage output from the power supply unit 64 to the fan motor 62 is determined, and if the voltage is lower than the reference voltage, the motor control unit 136 causes the fan motor immediately after the start of startup. Full speed control is performed for 62. Then, after the lapse of a predetermined period, the abnormality is determined. When the voltage is lower than the reference voltage, it is expected that the amount of inrush current is small. Therefore, even when the full-speed control is executed immediately after the start of the start without executing the deceleration control for the fan motor 62, the period from the inrush current to the stabilization to the drive current in the normal state is short.

Therefore, when the voltage output from the power supply unit 64 to the fan motor 62 is lower than the reference voltage, full-speed control for the fan motor 62 may be executed immediately after the start of startup to start abnormality detection at an early stage. It is possible.

(Modification example 3)
In the second modification of the first embodiment, when the voltage output from the power supply unit 64 to the fan motor 62 is lower than the reference voltage, the motor control unit 136 controls the fan motor 62 at full speed immediately after the start-up. The case of executing is explained.

On the other hand, when the voltage output from the power supply unit 64 to the fan motor 62 is higher than the reference voltage, it is desirable to delay the timing of starting abnormality detection more than usual until the drive current in the normal state stabilizes. In some cases.

In the third modification of the first embodiment, when the voltage output from the power supply unit 64 to the fan motor 62 is lower than the reference voltage, the timing for starting the abnormality detection is advanced, and the power supply unit 64 to the fan motor 62. When the output voltage is equal to or higher than the reference voltage, the case where the timing for starting the abnormality detection is delayed will be described.

FIG. 14 is a diagram illustrating a flow of starting abnormality detection of the abnormality determination unit 132 according to the third modification of the first embodiment.

As shown in FIG. 14, the control device 101 confirms the voltage output from the power supply unit 64 to the fan motor 62 (step S0). Specifically, the voltage detection unit 138 detects the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101.

Next, the control device 101 determines whether or not the voltage output from the power supply unit 64 to the fan motor 62 is equal to or higher than the reference voltage (step S1). Specifically, the voltage determination unit 139 determines whether or not the voltage output from the power supply unit 64 to the fan motor 62 via the control device 101 is equal to or higher than a predetermined reference voltage.

In step S1, when the control device 101 determines that the voltage output from the power supply unit 64 to the fan motor 62 is equal to or higher than the reference voltage (YES in step S1), the control device 101 instructs the deceleration start of the fan motor 62 (YES in step S1). Step S3). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Next, the control device 101 determines whether or not a certain period of time has elapsed (step S5). Specifically, the motor control unit 136 determines whether or not a certain period (1 second as an example) has elapsed since the motor was started.

In step S5, when the control device 101 determines that a certain period of time has elapsed (YES in step S5), the control device 101 instructs the fan motor 62 to reach full speed (step S7). For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the second predetermined period has elapsed (step S9). Specifically, the abnormality determination unit 132 determines whether or not a second predetermined period (1.8 seconds as an example) has elapsed since the fan motor 62 operates at full speed.

Next, when the control device 101 determines that the second predetermined period has elapsed (YES in step S9), the control device 101 starts abnormality detection (step S11). When the abnormality determination unit 132 determines that the second predetermined period (1.8 seconds as an example) has elapsed, the abnormality detection unit 132 starts abnormality detection. The abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

In step S1, when the control device 101 determines that the voltage output from the power supply unit 64 to the fan motor 62 is not equal to or higher than the reference voltage (NO in step S1), the control device 101 instructs the deceleration start of the fan motor 62 (NO). Step S12). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Next, the control device 101 determines whether or not a certain period of time has elapsed (step S14). Specifically, the motor control unit 136 determines whether or not a certain period (1 second as an example) has elapsed since the motor was started.

In step S14, when the control device 101 determines that a certain period of time has elapsed (YES in step S14), the control device 101 instructs the fan motor 62 to reach full speed (step S16). For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the third predetermined period has elapsed (step S18). Specifically, the abnormality determination unit 132 determines whether or not a third predetermined period (1.2 seconds as an example) has elapsed since the fan motor 62 operates at full speed.

Next, when the control device 101 determines that the third predetermined period has elapsed (YES in step S18), the control device 101 starts abnormality detection (step S11). When the abnormality determination unit 132 determines that the third predetermined period (1.2 seconds as an example) has elapsed, the abnormality detection unit 132 starts abnormality detection. The abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

FIG. 15 is a diagram illustrating a current at startup of the fan motor 62 according to the third modification of the first embodiment.

As shown in FIG. 15, in the third modification of the first embodiment, the voltage output from the power supply unit 64 to the fan motor 62 is determined, and the voltage output from the power supply unit 64 to the fan motor 62 is the reference voltage. In the above case, the abnormality is determined after the second predetermined period elapses (1.8 seconds) after the full speed control is performed. When the voltage output from the power supply unit 64 to the fan motor 62 is equal to or higher than the reference voltage, it is expected that the amount of inrush current is large. Therefore, when full-speed control is executed for the fan motor 62, the period from the generation of the inrush current to the stabilization of the drive current in the normal state is relatively long. Therefore, when the voltage output from the power supply unit 64 to the fan motor 62 is equal to or higher than the reference voltage, when full-speed control is executed for the fan motor 62, a longer period than usual is secured and abnormality detection is started. .. This makes it possible to reliably detect an abnormality while the drive current is stable.

On the other hand, the voltage output from the power supply unit 64 to the fan motor 62 is determined, and if the voltage output from the power supply unit 64 to the fan motor 62 is lower than the reference voltage, full speed control is performed before the third. After the lapse of a predetermined period (1.2 seconds), an abnormality is determined. When the voltage output from the power supply unit 64 to the fan motor 62 is lower than the reference voltage, it is expected that the amount of inrush current is small. Therefore, even when full-speed control is executed for the fan motor 62, the period from the generation of the inrush current to the stabilization of the drive current in the normal state is short. Therefore, when the voltage output from the power supply unit 64 to the fan motor 62 is lower than the reference voltage, it is possible to start abnormality detection at an early stage even when full-speed control is executed for the fan motor 62. Is.

In this example, the case where the deceleration control is executed immediately after the start of the fan motor 62 has been described, but the same applies to the case where the full speed control is executed immediately after the start as described in the first embodiment. Is.

(Modification example 4)
In the above embodiment, the configuration immediately after startup has been described. In this modification 4, the case of restarting will be described.

FIG. 16 is a diagram illustrating currents at the time of starting and restarting the fan motor 62 of the image forming apparatus 1 according to the fourth modification of the first embodiment.

As shown in FIG. 16, an inrush current flows when the fan motor 62 is started and restarted. On the other hand, when restarting, the inrush current is smaller than when restarting.

Therefore, in the modified example 4 of the first embodiment, the abnormality of the fan motor 62 is determined at an early stage at the time of restarting.

FIG. 17 is a diagram illustrating a timing for detecting an abnormality determination of the abnormality determination unit 132 according to the embodiment.

As shown in FIG. 17, in the modified example 4 of the first embodiment, the deceleration control is executed for a certain period immediately after the start-up and immediately after the restart, and then the full-speed control is executed.

The motor control unit 136 executes deceleration control on the fan motor 62 for a certain period (1 second as an example) immediately after the start and the restart. The motor control unit 136 executes full-speed control after a certain period of time. The abnormality determination unit 132 starts abnormality detection after the lapse of the first predetermined period (1.5 seconds as an example) during full speed control of the fan motor 62.

Further, in the case of restarting, the abnormality determination unit 132 determines an abnormality after the lapse of a fourth predetermined period (1.2 seconds as an example) during full speed control of the fan motor 62. Specifically, the abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

In this example, the abnormality determination unit 132 may determine as an abnormality when the current value detected by the current detection unit 130 is an abnormal value a plurality of times. For example, the abnormality determination unit 132 may detect a current value every 20 ms and determine that the current value is abnormal for N consecutive times (N ≧ 2). It is possible to ensure the reliability of the abnormality by making a judgment multiple times.

The lock abnormality determination unit 134 determines whether or not the fan motor 62 is locked after a lapse of a predetermined period (1 second as an example) after the start. Specifically, the lock abnormality determination unit 134 determines whether or not the lock signal from the fan motor 62 is received.

In this example, the lock abnormality determination unit 134 may determine that the fan motor 62 is locked multiple times as an abnormality. For example, the lock abnormality determination unit 134 may detect the lock signal and determine that the lock signal is abnormal when it is detected continuously for N seconds (N ≧ 2). It is possible to ensure the reliability of the abnormality by making a judgment multiple times.

FIG. 18 is a diagram illustrating a flow of starting abnormality detection of the abnormality determination unit 132 according to the fourth modification of the first embodiment.

As shown in FIG. 18, the control device 101 determines whether or not the start of the fan motor 62 is a restart immediately after the stop (step S20).

In step S20, when the control device 101 determines that the start of the fan motor 62 is not a restart immediately after the stop (NO in step S20), the control device 101 instructs the deceleration start of the fan motor 62 (step S3). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Next, the control device 101 determines whether or not a certain period of time has elapsed (step S5). Specifically, the motor control unit 136 determines whether or not a certain period (1 second as an example) has elapsed since the motor was started.

In step S5, when the control device 101 determines that a certain period of time has elapsed (YES in step S5), the control device 101 instructs the fan motor 62 to reach full speed (step S7). For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the first predetermined period has elapsed (step S9). Specifically, the abnormality determination unit 132 determines whether or not a first predetermined period (1.5 seconds as an example) has elapsed since the fan motor 62 operates at full speed.

Next, when the control device 101 determines that the first predetermined period has elapsed (YES in step S9), the control device 101 starts abnormality detection (step S11). When the abnormality determination unit 132 determines that the first predetermined period has elapsed, the abnormality determination unit 132 starts abnormality detection. Specifically, the abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

On the other hand, when the control device 101 determines that the start of the fan motor 62 is a restart immediately after the stop (YES in step S20), the control device 101 instructs the deceleration start of the fan motor 62 (step 22). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Next, the control device 101 determines whether or not a certain period of time has elapsed (step S24). Specifically, the motor control unit 136 determines whether or not a certain period (1 second as an example) has elapsed since the motor was started.

In step S24, when the control device 101 determines that a certain period of time has elapsed (YES in step S24), the control device 101 instructs the fan motor 62 to reach full speed (step S26). For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the fourth predetermined period has elapsed (step S28). Specifically, the abnormality determination unit 132 determines whether or not a first predetermined period (1.2 seconds as an example) has elapsed since the fan motor 62 operates at full speed.

Next, when the control device 101 determines that the fourth predetermined period has elapsed (YES in step S28), the control device 101 starts abnormality detection (step S11). When the abnormality determination unit 132 determines that the fourth predetermined period has elapsed, the abnormality determination unit 132 starts abnormality detection. Specifically, the abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

In the fourth modification of the first embodiment, when the fan motor 62 is restarted immediately after the stop, the inrush current becomes small, so that the current amount of the drive current stabilizes at an early stage. Therefore, if the startup is a restart immediately after the stop, it is possible to start the abnormality detection at an early stage.

In this example, the case where the deceleration control is executed immediately after the start of the fan motor 62 has been described, but the same applies to the case where the full speed control is executed immediately after the start as described in the first embodiment. Is.

(Modification 5)
In the fourth modification of the first embodiment, the case where the deceleration control is executed even when the start of the fan motor 62 is a restart immediately after the stop has been described. On the other hand, since the inrush current becomes small, it is possible to execute full-speed control when the fan motor 62 is restarted immediately after it is stopped.

FIG. 19 is a diagram illustrating currents at the time of starting and restarting the fan motor 62 of the image forming apparatus 1 according to the fifth modification of the first embodiment.

As shown in FIG. 19, an inrush current flows when the fan motor 62 is started and restarted. On the other hand, when restarting, the inrush current is smaller than when restarting. Therefore, in the modified example 4 of the first embodiment, the abnormality of the fan motor 62 is determined at an early stage at the time of restarting.

In this respect, at the time of restart, full speed control is executed immediately after startup.

FIG. 20 is a diagram illustrating a timing for detecting an abnormality determination of the abnormality determination unit 132 according to the modification 5 of the first embodiment.

As shown in FIG. 20, in the modified example 5 of the first embodiment, the deceleration control is executed for a certain period immediately after the start-up, and then the full speed control is executed. On the other hand, immediately after restarting, full speed control is executed.

The motor control unit 136 executes deceleration control on the fan motor 62 for a certain period (1 second as an example) immediately after the start-up. Then, the motor control unit 136 executes full-speed control after a certain period of time. The abnormality determination unit 132 starts abnormality detection after the lapse of the first predetermined period (1.5 seconds as an example) during full speed control of the fan motor 62.

The motor control unit 136 executes full-speed control on the fan motor 62 when the start of the fan motor 62 is a restart immediately after the stop. The abnormality determination unit 132 starts abnormality detection after the lapse of a fourth predetermined period (1.2 seconds as an example) during full speed control of the fan motor 62.

FIG. 21 is a diagram illustrating a flow of starting abnormality detection of the abnormality determination unit 132 according to the fifth modification of the first embodiment.

As shown in FIG. 21, the difference is that step S22 and step S24 are deleted as compared with FIG.

Since the other configurations are the same, the detailed description thereof will not be repeated.

In the fifth modification of the first embodiment, when the fan motor 62 is restarted immediately after the stop, the inrush current becomes smaller, so that the current amount of the drive current stabilizes at an early stage. Therefore, when the start is a restart immediately after the stop, it is possible to execute the full speed control for the fan motor 62 and start the abnormality detection at an early stage.

(Embodiment 2)
In the second embodiment, the configuration of the shutter mechanism provided in the fuser 60 will be described.

FIG. 22 is a diagram illustrating a shutter mechanism according to the second embodiment.

With reference to FIG. 22, the fuser 60 includes a fixing roller 60A. The fixing roller 60A is heated by a heating device (not shown). When the fixing roller 60A and the paper come into contact with each other, the toner image is fixed on the paper by being pressurized and heated. On the other hand, since the size of the paper is different, the fixing area is different depending on the size. In this example, the fixing regions of the four types of paper sizes A, B, C, and D are shown, respectively. The size is in the order of paper D> paper C> paper B> paper A.

If the temperature outside the fixing region of the fixing roller 60A is high, stains may be transferred to the paper. Therefore, in this example, the outside of the fixing region of the fixing roller 60A is cooled by a fan motor.

Specifically, fan motors 62A and 62B are provided on one end side and the other end side of the fixing roller 60A, respectively. Shutter mechanisms 64A and 64B are provided in each of the fan motors 62A and 62B, respectively. The shutter mechanism 64A is provided so as to cover the fan motor 62A, and the opening amount of the air outlet can be adjusted. The shutter mechanism 64B is provided so as to cover the fan motor 62B, and the opening amount of the air outlet can be adjusted. Specifically, three shutters B1 to B3 that can be opened and closed are provided.

In the case of fixing the paper A, all the shutters B1 to B3 are opened in order to cool the outside of the fixing region of the fixing roller 60A corresponding to the paper A. In this case, the air from the air outlet is output to the outside of the fixing region of the paper A of the fixing roller 60A.

In the case of fixing the paper B, all the shutters B1 and B2 are opened in order to cool the outside of the fixing region of the fixing roller 60A corresponding to the paper B. In this case, the air from the air outlet is output to the outside of the fixing region of the paper B of the fixing roller 60A.

In the case of fixing the paper C, all the shutters B1 are opened in order to cool the outside of the fixing region of the fixing roller 60A corresponding to the paper C. In this case, the air from the air outlet is output to the outside of the fixing region of the paper C of the fixing roller 60A.

In the case of fixing the paper D, all the shutters B1 to B3 are closed because there is no outside of the fixing region of the fixing roller 60A corresponding to the paper D. In this case, the air from the air outlet is not output to the fixing roller 60A.

FIG. 23 is a diagram illustrating a current at the time of starting the fan motor 62 of the image forming apparatus 1 according to the second embodiment.

As shown in FIG. 23, an inrush current flows when the fan motor 62 is started. Further, it is shown that the inrush current differs depending on the size of the paper.

Specifically, the smaller the paper size, the larger the inrush current, and the larger the paper size, the smaller the inrush current. By opening the shutter, the load on the fan motors 62A and 62B increases, so the inrush current increases. On the other hand, by closing the shutter, the load on the fan motors 62A and 62B is reduced, so that the inrush current is reduced. Therefore, the timing at which the drive current stabilizes differs depending on the size of the paper.

In the second embodiment, the timing of determining the abnormality of the fan motor 62 is adjusted according to the size of the paper.

In the second embodiment, the length of a predetermined period in which the timing of starting abnormality detection can be adjusted according to the size of the paper is adjusted. It is assumed that a predetermined period according to the size of the paper is preset and stored in the storage device 110.

Specifically, the larger the paper size, the earlier the timing of the predetermined period for determining the abnormality of the fan motor 62, and the smaller the paper size, the later the timing of the predetermined period for determining the abnormality of the fan motor 62.

FIG. 24 is a diagram illustrating a timing for detecting an abnormality determination of the abnormality determination unit 132 according to the second embodiment.

As shown in FIG. 24, the control device 101 confirms the size of the paper (step S30). The timing adjustment unit 140 acquires the size information of the paper input via the display panel 105.

Next, the control device 101 adjusts the shutter mechanism (step S32). The shutter mechanism adjusting unit 142 controls the opening and closing of the shutters B1 to B3 according to the size of the paper input via the display panel 105.

Next, the control device 101 sets a predetermined period (step S34). The timing adjustment unit 140 sets a predetermined period stored in advance in the storage device 110 based on the paper size information input via the display panel 105.

Next, the control device 101 instructs the deceleration start of the fan motor 62 (step S36). The motor control unit 136 instructs the fan motor 62 to start decelerating. For example, the motor control unit 136 instructs the fan motor 62 to operate at half speed.

Next, the control device 101 determines whether or not a certain period of time has elapsed (step S38). Specifically, the motor control unit 136 determines whether or not a certain period (1 second as an example) has elapsed since the motor was started.

In step S38, when the control device 101 determines that a certain period of time has elapsed (YES in step S38), the control device 101 instructs the fan motor 62 to reach full speed (step S40). For example, the motor control unit 136 instructs the fan motor 62 to operate at full speed.

Next, the control device 101 determines whether or not the set predetermined period has elapsed (step S42). Specifically, the abnormality determination unit 132 determines whether or not a predetermined predetermined period has elapsed since the fan motor 62 operates at full speed.

Next, when the control device 101 determines that the set predetermined period has elapsed (YES in step S42), the control device 101 starts abnormality detection (step S44). When the abnormality determination unit 132 determines that the set predetermined period has elapsed, the abnormality determination unit 132 starts abnormality detection. The abnormality determination unit 132 determines whether or not the current value of the drive current detected by the current detection unit 130 is an abnormal value. For example, it is determined whether or not the current value is equal to or higher than a predetermined reference current.

Then, the process ends (end).

In this example, the case where the deceleration control is executed immediately after the start of the fan motor 62 has been described, but the same applies to the case where the full speed control is executed immediately after the start as described in the first embodiment. Is.

Further, in this example, the configuration in which the blowout amount is adjusted by the shutter mechanism before starting is described, but after the fan motor 62 is controlled at full speed with the air blowout amount reduced by the shutter mechanism, the shutter is released. The blowout amount may be adjusted by a mechanism. As a result, the start-up can be started with a small load, so that the inrush current can be suppressed and the abnormality detection can be started at an early stage.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Image forming device, 10 Photoreceptor, 11 Charging device, 13 Exposure device, 14 Developer, 15C, 15K, 15M, 15Y toner bottle, 17,43 Cleaning unit, 18 Toner sensor, 20 Scanner, 21 Cover, 22 Paper stand , 23, 49 trays, 25 printers, 90C, 90K, 90M, 90Y image creator, 101 control device, 102 ROM, 103 RAM, 104 network interface, 105 display panel, 106 microphone, 110 storage device, 112 programs.

Claims (17)

The fan motor provided in the image forming part and
A control unit for driving the fan motor is provided.
The control unit
A current detector that detects the current flowing through the fan motor,
Including an abnormality determination unit that determines an abnormality of the fan motor based on the current detection unit.
The abnormality determination unit is an image forming apparatus that determines an abnormality of the fan motor after a lapse of a predetermined period from the start of the fan motor. The image forming apparatus according to claim 1, wherein the control unit further includes a motor control unit that executes deceleration control when the fan motor is started. The image forming apparatus according to claim 2, wherein the motor control unit executes full-speed control after deceleration control for a certain period of time when the fan motor is started. The image forming apparatus according to claim 3, wherein the abnormality determination unit determines an abnormality of the fan motor during the period of full speed control of the fan motor. When the fan motor is restarted immediately after the fan motor is stopped, the motor control unit performs deceleration control for a certain period of time and then executes full speed control.
The image forming apparatus according to claim 2, wherein the abnormality determination unit determines an abnormality of the fan motor after a lapse of the predetermined period after restarting the fan motor. The image according to claim 1, wherein the abnormality determination unit determines an abnormality of the fan motor when the abnormality value of the current is detected a plurality of times during the detection period based on the detection result of the current detection unit. Forming device. The fan motor is used when the ratio of the number of detections of an abnormal value of the current to a plurality of detections during the detection period based on the detection result of the current detection unit is equal to or higher than a predetermined ratio. The image forming apparatus according to claim 6, which determines the abnormality of the above. The control unit
A voltage detector that detects the voltage input to the fan motor,
Further including a voltage determination unit for determining whether or not the voltage detected by the voltage detection unit is equal to or lower than the reference voltage.
The image according to claim 2, wherein the motor control unit does not execute the deceleration control when the voltage detected by the voltage detection unit is equal to or lower than the reference voltage based on the determination result of the voltage determination unit. Forming device. The control unit
A voltage detector that detects the voltage input to the fan motor,
Further including a voltage determination unit for determining whether or not the voltage detected by the voltage detection unit is equal to or lower than the reference voltage.
Based on the determination result of the voltage determination unit, when the voltage detected by the voltage detection unit is equal to or lower than the reference voltage, the abnormality determination unit has an abnormality of the fan motor after the lapse of the first predetermined period. The image forming apparatus according to claim 1. Based on the determination result of the voltage determination unit, the abnormality determination unit has a second predetermined period longer than the first predetermined period when the voltage detected by the voltage detection unit is larger than the reference voltage. The image forming apparatus according to claim 9, wherein after the lapse of time, the abnormality of the fan motor is determined. The abnormality determination unit
After the predetermined period has elapsed from the start of the fan motor, an abnormality of the fan motor is determined, and the abnormality is determined.
The image forming apparatus according to claim 1, wherein when the fan motor is restarted immediately after the fan motor is stopped, an abnormality of the fan motor is determined after a period shorter than the predetermined period has elapsed. The motor control unit executes full-speed control without deceleration control when restarting the fan motor immediately after the fan motor is stopped.
The image forming apparatus according to claim 2, wherein the abnormality determination unit determines an abnormality of the fan motor after a period shorter than the predetermined period has elapsed after restarting the fan motor. Further equipped with a shutter mechanism capable of adjusting the amount of air blown from the fan motor,
The image forming apparatus according to claim 1, wherein the control unit further includes a timing adjustment unit that adjusts the predetermined period based on the adjustment amount of the shutter mechanism. The shutter mechanism reduces the amount of air blown out when the fan motor is started.
The image forming apparatus according to claim 13, wherein the control unit further includes a motor control unit that executes full-speed control when the fan motor is started. The image forming apparatus according to claim 1, wherein the control unit further includes a lock abnormality determination unit for determining a lock abnormality of the fan motor. The image forming apparatus according to claim 15, wherein the lock abnormality determination unit determines a lock abnormality of the fan motor before the predetermined period. The image forming apparatus according to claim 16, wherein the abnormality determination unit does not determine an abnormality of the fan motor when the lock abnormality determination unit determines a lock abnormality of the fan motor.

Images