JP2021196520A - Driving device and image forming apparatus - Google Patents

Abstract

To accurately determine an abnormality in a transmission state of drive transmission switching means.SOLUTION: A driving device 150 has drive transmission switching means that switches the state of drive transmission paths for transmitting a driving force from a driving source to bodies to be driven, and abnormality determination means 140 that determines the presence or absence of an abnormality in a transmission state of the drive transmission switching means, and comprises, as the drive transmission switching means, a plurality of drive transmission switching means 118, 119 that correspond to the plurality of drive transmission paths for transmitting the driving force from the same driving source 101 to bodies 6, 7 to be driven different from each other and switch the state of the drive transmission paths between a transmission state and a non-transmission state. The abnormality determination means selects a part of drive transmission switching means from the plurality of drive transmission switching means as an abnormality determination target, and determines the presence or absence of an abnormality in the transmission state for the abnormality determination target by using drive information on the driving source when the state of the drive transmission paths is switched to the transmission state with the selected abnormality determination target or control amount information on the driving source generated from the drive information.SELECTED DRAWING: Figure 2

Description

The present invention relates to a drive device and an image forming device.

Conventionally, it is determined whether or not there is an abnormality in the transmission state of the drive transmission switching means for switching the state of the drive transmission path for transmitting the driving force from the drive source to the driven body between the transmission state and the non-transmission state, and the drive transmission switching means. A driving device having an abnormality determination means is known.

For example, in Patent Document 1, a clutch (drive transmission switching means) for transmitting the rotational driving force of a motor (driving source) for driving a rotating body of an image forming apparatus to the rotating body is engaged (transmission state) and released (non-transmission). A drive device including a clutch control unit for switching between a state and a state) is disclosed. In this drive device, based on the rotation speed (drive information) of the motor when the clutch performs the coupling operation, the coupling time from the start of the clutch coupling operation to the steady state of the drive transmission has a predetermined upper limit. If it exceeds, it is determined that the responsiveness of the clutch is abnormal (abnormal in the transmission state), and it is determined that the life of the clutch has expired.

However, with the conventional drive device, there is a problem that it is difficult to determine the abnormality in the transmission state of the drive transmission switching means with high accuracy.

In order to solve the above-mentioned problems, the present invention comprises a drive transmission switching means for switching a state of a drive transmission path for transmitting a drive force from a drive source to a driven body into a transmission state and a non-transmission state, and the drive transmission. A drive device having an abnormality determining means for determining the presence or absence of an abnormality in a transmission state of the switching means, and as the drive transmission switching means, a plurality of driving forces that transmit driving forces from the same drive source to different driven bodies. A plurality of drive transmission switching means corresponding to each drive transmission path and switching the state of each drive transmission path between a transmission state and a non-transmission state are provided, and the abnormality determination means is one of the plurality of drive transmission switching means. The drive information of the drive source or the drive generated from the drive information when the drive transmission switching means of the unit is selected as the abnormality determination target and the state of the drive transmission path is set to the transmission state by the selected abnormality determination target. It is characterized in that the presence or absence of an abnormality in the transmission state of the abnormality determination target is determined by using the control amount information of the source.

According to the present invention, it is possible to determine with high accuracy the abnormality in the transmission state of the drive transmission switching means.

The schematic block diagram of the image forming apparatus in an embodiment. The schematic block diagram of the drive device which drives the transport roller provided in the image forming apparatus. The functional block diagram which shows the control system of the drive device. (A) is a graph showing data of the integrated control amount when a normal single electromagnetic clutch is turned on and off. (B) is a graph showing data of the integrated control amount when a single electromagnetic clutch in which slip (abnormality) occurs is turned on and off. (A) is a graph showing data of the integrated control amount when a plurality of normal electromagnetic clutches are turned on and off at the same time. (B) is a graph showing data of the integrated control amount when a plurality of electromagnetic clutches in which slip (abnormality) has occurred are turned on and off at the same time. The flowchart which shows the processing procedure for performing the abnormality determination of the electromagnetic clutch in failure diagnosis mode 1. (A) is a graph showing data of the integrated control amount when the setting for the failure diagnosis mode is used as the motor control gain when the electromagnetic clutch is normal. (B) is a graph showing the integrated control amount when the setting during normal operation is used as the motor control gain when the electromagnetic clutch is normal. (A) is a graph showing an integral control amount when the setting for the failure diagnosis mode is used as the motor rotation speed (motor speed) when the electromagnetic clutch is normal. (B) is a graph showing an integral control amount when the setting during normal operation is used as the motor rotation speed (motor speed) when the electromagnetic clutch is normal. Explanatory drawing which shows an example of the screen which displayed the failure diagnosis result in failure diagnosis mode 1. The flowchart which shows the processing procedure for performing the abnormality determination of the electromagnetic clutch in failure diagnosis mode 2. The explanatory view which shows an example of the screen for selecting the clutch which is the abnormality judgment target in failure diagnosis mode 2. Explanatory drawing which shows an example of the screen which displayed the failure diagnosis result in failure diagnosis mode 2. The flowchart which shows the processing procedure for performing the abnormality determination of the electromagnetic clutch in failure diagnosis mode 3. The flowchart which shows the processing procedure for performing the abnormality determination of the electromagnetic clutch in failure diagnosis mode 4.

Hereinafter, an embodiment in which the drive device according to the present invention is applied to a drive device of a transfer roller which is a rotating body as a driven body for transporting paper as a recording material in an image forming apparatus will be described.
In this embodiment, control of a DC motor used as a drive source for a rotating body for transporting paper in an electrophotographic image forming apparatus will be described as an example, but the present invention is not limited to this, and other methods such as an inkjet method and the like will be described. Of course, it can also be applied as a driving means for a transport rotating body of the image forming apparatus, an ink carriage, and a driving source provided in other electronic devices.

FIG. 1 is a schematic configuration diagram of an image forming apparatus according to the present embodiment.
The image forming apparatus 100 of the present embodiment generates a toner image which is a visible image of yellow, magenta, cyan, and black (hereinafter, referred to as “Y”, “M”, “C”, and “K”, respectively). Therefore, the photoconductor drums 1Y, 1M, 1C, 1K as four latent image carriers and the developing devices 2Y, 2M, 2C, 2K as developing means are provided. The developing devices 2Y, 2M, 2C, and 2K are provided with developing rollers 3Y, 3M, 3C, and 3K, respectively.

An exposure device 4 as a latent image forming means for forming a latent image is arranged in the lower part of the drawing of each developing device 2Y, 2M, 2C, 2K. The exposure apparatus 4 irradiates the photoconductor drums 1Y, 1M, 1C, and 1K with a laser beam emitted based on the image information to expose the photoconductor drums 1Y, 1M, 1C, and 1K. By this exposure, a Y electrostatic latent image, an M electrostatic latent image, a C electrostatic latent image, and a K electrostatic latent image are formed on each of the photoconductor drums 1Y, 1M, 1C, and 1K, respectively. The exposure apparatus 4 irradiates the photoconductor drum through the optical lens and the mirror while scanning the laser beam emitted from the light source with the polygon mirror rotationally driven by the motor.

Further, on the lower side of the drawing of the exposure apparatus 4, a paper feeding mechanism having a paper accommodating cassette 5, a paper feeding roller 6, a resist roller pair 7, and the like is arranged. The paper storage cassette 5 stores a plurality of sheets of paper 23 in a stacked manner, and the paper feed roller 6 is in contact with the top paper 23. When the paper feed roller 6 is rotated counterclockwise in the drawing by the drive device, the top paper 23 is fed between the rollers of the resist roller vs. 7. The resist roller pair 7 rotationally drives both rollers in order to sandwich the paper 23, but immediately stops the rotation immediately after sandwiching the paper 23. Then, the resist roller pair 7 feeds the paper 23 toward the secondary transfer nip described later at an appropriate timing.

Further, in the upper part of the drawing of the developing apparatus 2Y, 2M, 2C, 2K, an intermediate transfer unit 15 that moves the intermediate transfer belt 8 as an intermediate transfer body endlessly while being stretched is arranged. In addition to the intermediate transfer belt 8, the intermediate transfer unit 15 also includes four primary transfer bias rollers 9Y, 9M, 9C, 9K, a belt cleaning device 10, a secondary transfer backup roller 11, a cleaning backup roller 12, a tension roller 13, and the like. ing.

The intermediate transfer belt 8 is stretched on these seven rollers and is endlessly moved counterclockwise in the figure by the rotational drive of at least one of the rollers. The primary transfer bias rollers 9Y, 9M, 9C, and 9K each form an intermediate transfer belt 8 that is endlessly moved in this way by sandwiching the intermediate transfer belt 8 between the photoconductor drums 1Y, 1M, 1C, and 1K, respectively. is doing. These are of a method in which a transfer bias having the opposite polarity (for example, positive polarity) to the toner is applied to the back surface (loop inner peripheral surface) of the intermediate transfer belt 8.

All rollers except the primary transfer bias rollers 9Y, 9M, 9C, and 9K are electrically grounded. The intermediate transfer belt 8 sequentially passes through the primary transfer nips for Y, M, C, and K as it moves endlessly, and the Y toner image on each of the photoconductor drums 1Y, 1M, 1C, and 1K. The M toner image, the C toner image, and the K toner image are superimposed and primary transferred. As a result, a four-color superimposed toner image (hereinafter referred to as “four-color toner image”) is formed on the intermediate transfer belt 8.

Further, the intermediate transfer unit 15 is also provided with a contact / detachment mechanism for bringing the intermediate transfer belt 8 into contact with the photoconductor drums 1Y, 1M, 1C in a state where the intermediate transfer belt 8 is in contact with the photoconductor drum 1K. Has been done.

The secondary transfer backup roller 11 sandwiches the intermediate transfer belt 8 with the secondary transfer roller 16 to form a secondary transfer nip. The four-color toner image formed on the intermediate transfer belt 8 is transferred to the paper 23 by the secondary transfer nip. Then, in combination with the white color of the paper 23, a full-color toner image is obtained.

The transfer residual toner that has not been transferred to the paper 23 adheres to the intermediate transfer belt 8 after passing through the secondary transfer nip. It is cleaned by the belt cleaning device 10. In the secondary transfer nip, the paper 23 is sandwiched between the intermediate transfer belt 8 and the secondary transfer roller 16 whose surfaces move forward with each other, and is conveyed in the direction opposite to the resist roller pair 7 side.

When the paper 23 sent out from the secondary transfer nip passes between the rollers of the fixing unit 17 as a unit that can be attached to and detached from the image forming apparatus 100 main body, it receives the sound of heat and pressure and receives 4 on the surface. The color toner image is fixed. After that, the paper 23 is discharged to the outside of the machine through the space between the paper ejection rollers vs. 18 rollers.

A stack portion 20 is formed on the upper surface of the image forming apparatus 100 main body, and the paper 23 discharged to the outside of the machine by the paper ejection roller pair 18 is sequentially stacked on the stack portion 20.

A bottle support portion 21 is disposed between the intermediate transfer unit 15 and the stack portion 20 above the intermediate transfer unit 15. Toner bottles 22Y, 22M, 22C, and 22K are set in the bottle support portion 21 as an agent container for accommodating each color toner.

Each color toner in each toner bottle 22Y, 22M, 22C, 22K is appropriately replenished to the developing device 2Y, 2M, 2C, 2K by the toner supply device, respectively. Each toner bottle 22Y, 22M, 22C, 22K can be attached to and detached from the main body of the image forming apparatus 100 independently of the developing apparatus 2Y, 2M, 2C, 2K.

Further, the image forming apparatus 100 includes a main body control unit 30 including a CPU and a memory 31 for storing a program or the like executed by the main body control unit 30. The main body control unit 30 reads a program from the memory 31 and executes it based on an instruction signal input from an operation panel or the like, and controls each of the above-mentioned components.

FIG. 2 is a schematic configuration diagram of a drive device for driving a transfer roller included in the image forming device 100.
The drive device 150 shown in FIG. 2 includes a DC motor for driving any of the transfer rollers of the image forming device 100 shown in FIG. 1, a control circuit thereof, and the like. In the following description, a drive device for driving the paper feed roller 6 and the resist roller pair 7 shown in FIG. 1 by the same drive source will be given as an example. However, the same can be applied to transport rollers other than the paper feed roller 6 and the resist roller pair 7 (paper discharge roller pair 18, paper feed roller of the additional paper accommodating cassette, etc.).

The drive device 150 of the paper feed roller 6 and the resist roller pair 7 includes a DC motor 101 as a drive source, drive transmission gears 111 to 117 as drive transmission means, electromagnetic clutches 118 and 119 as drive transmission switching means, and drive control means. The control circuit 120 and the driver circuit 125 are provided.

The DC motor 101 is composed of, for example, a DC (direct current) brushless motor, and includes a gear 102a fixed to an output shaft 102 and an encoder 103 (see FIG. 3). The DC motor 101 rotates the paper feed roller 6 and the resist roller pair 7 via the gear 102a and the drive transmission gears 111 to 117.

The DC motor 101 of the present embodiment is configured as an inner rotor motor, but is not limited to this, and may be configured as an outer rotor motor. In particular, the outer rotor motor is generally suitable for constant speed control, and can be said to be suitable in the present embodiment aiming to maintain the target speed as quickly as possible with respect to a speed change.

The encoder 103 of the DC motor 101 includes, for example, an encoder disk and a photo sensor. The encoder 103 constitutes a drive information acquisition unit for acquiring drive information of the DC motor 101 which is a drive source. The encoder disk has a predetermined number of slits at predetermined angular intervals in the circumferential direction, is fixed perpendicularly and concentrically to the output shaft 102, and rotates with the rotation of the output shaft 102. The photosensor, which is an optical sensor, is attached to the DC motor 101 so as to sandwich the encoder disk. The slit of the encoder disk transmits and blocks the optical path, and the light receiving element of the photosensor turns into a pulse signal to control the encoder signal. It is transmitted to the circuit 120.

In the control circuit 120, the rotation amount and the rotation speed of the DC motor 101 are derived by measuring this pulse signal, and the position and speed information of the paper 23 are derived from the position and speed information of the paper feed roller 6 and the resist roller pair 7. Can be obtained. The photosensor has two sets of light emitting elements and light receiving elements, and is arranged so that the pulse signal phase difference of each is a predetermined amount (π / 2 [rad] in this embodiment).

The control circuit 120 generates an operation signal of the DC motor 101 based on the target drive signal output by the main body control unit 30 and the output signal of the encoder 103, sends the operation signal to the driver circuit 125, and then operates from the driver circuit 125. By passing a current corresponding to the signal through the DC motor 101, the paper feed roller 6 and the resist roller pair 7 are driven.

Further, in the present embodiment, among the drive transmission gears 111 to 117, the drive transmission gear 114 attached to the rotating shaft of the paper feed roller 6 and the drive transmission gear 117 attached to the drive shaft of the resist roller pair 7 are used. Electromagnetic clutches 118 and 119 as drive transmission switching means are built-in, respectively. The electromagnetic clutches 118 and 119 transmit the driving force from the input side to the output side of the drive transmission gears 114 and 117 by turning on (connecting) or off (releasing) the pair of built-in connecting members by electromagnetic force. It is designed to switch to the transmitted state or the non-transmitted state.

By turning on / off the electromagnetic clutches 118 and 119, the transmission and non-transmission of the driving force from the DC motor 101 to the paper feed roller 6 and the resist roller pair 7 are controlled independently of each other. The electromagnetic clutches 118 and 119 are controlled by a control signal from the control circuit 120.

FIG. 3 is a functional block diagram showing a control system of the drive device 150 in the present embodiment.
The target speed setting unit 130 sets the target rotation speed of the DC motor 101 (hereinafter, also simply referred to as “target speed”). Further, the abnormality determination unit 140 functions as an abnormality determination means and executes an abnormality determination process for performing an abnormality determination of the electromagnetic clutches 118 and 119. The target speed setting unit 130 and the abnormality determination unit 140 can be configured by the main body control unit 30.

The control circuit 120 in the drive device 150 of the present embodiment is mainly composed of a controller 121, a PWM (pulse width modulation) conversion unit 122, and a speed detection unit 123. The load connected to the DC motor 101 is a drive transmission gear 111-117, an electromagnetic clutch 118, 119, a paper feed roller 6, a resist roller pair 7, and the like. In the present embodiment, the controller 121, the PWM conversion unit 122, and the speed detection unit 123 can be configured as, for example, an ASIC that operates based on a command from the CPU.

The controller 121 has a target speed of the DC motor 101 set by the target speed setting unit 130 and a detected rotation speed (hereinafter, detected rotation speed) which is drive information of the DC motor 101 detected by the encoder 103 and sent from the speed detection unit 123. Based on the "rotational speed"), PID (proportional control, integral control, differential control) calculation, low-pass filter calculation, etc. are performed to perform feedback control for calculating the control amount.

The PWM conversion unit 122 converts a duty signal (drive duty of the PWM signal, duty value of the PWM signal) proportional to the control amount calculated by the controller 121. The driver circuit 125 applies a voltage proportional to the duty of the signal output from the PWM conversion unit 122 to the DC motor 101 to drive the DC motor 101. The DC motor 101 is driven by the output voltage from the driver circuit 125 and is controlled to rotate at the target speed set by the target speed setting unit 130.

The speed detection unit 123 detects the rotation speed of the DC motor 101 based on the encoder signal from the encoder 103 of the DC motor 101. The encoder 103 generates a signal having a frequency proportional to the rotation speed of the DC motor 101, and outputs this as an encoder signal. The speed detection unit 123 detects the rotation speed of the DC motor 101 based on this encoder signal, and sends the detected rotation speed to the controller 121.

Next, the abnormality determination process for determining the abnormality of the electromagnetic clutches 118 and 119 in the present embodiment will be described.
The electromagnetic clutches 118 and 119 of the present embodiment have abnormalities (abnormalities in the transmission state) such as slippage (state in which the driving force from the DC motor 101 cannot be accurately transmitted) when connected (in the transmission state) due to deterioration over time. Occurs. When such an abnormality occurs, the detected rotation speed, which is the drive information of the DC motor 101 used for the feedback control of the DC motor 101, and the control amount generated from the detected rotation speed are different from those in the normal state. Changes appear.

First, consider a case where there is only one electromagnetic clutch that switches the state of the drive transmission path that transmits the drive force from the drive source (DC motor 101) to the driven body. During the engagement of the electromagnetic clutch, the load of the driven body is constantly applied to the DC motor 101. At this time, if an abnormality such as slippage occurs in the electromagnetic clutch, the drive load applied to the DC motor 101 is higher than that in the normal state as a result of slippage or the like even when the electromagnetic clutch is engaged. It will be small. As a result, the detected rotation speed of the DC motor 101 has a smaller error from the target rotation speed than in the normal state, and the integrated control amount H2 generated from this detected rotation speed is shown in FIG. 4 (b). It is smaller than the normal integrated control amount H1 shown in (a). The rotation speeds of the paper feed roller 6 and the resist roller pair 7 which are the driven bodies do not reach the target value due to the occurrence of slippage or the like, and thus become abnormal.

On the other hand, when the electromagnetic clutch is normal, slipping or the like does not occur, so that the load applied to the DC motor 101 is larger than when an abnormality such as slipping occurs. As a result, the detected rotation speed of the DC motor 101 has a larger error from the target rotation speed than when an abnormality such as slippage occurs, and the integrated control amount H1 generated from this detected rotation speed is shown in FIG. As shown in (a), it is larger than the integral control amount H2 at the time of abnormality shown in FIG. 4 (b). Therefore, it is possible to determine the presence or absence of an abnormality in the electromagnetic clutch based on the difference in the integrated control amount between the normal time and the abnormal time.

Next, as in the present embodiment, the state of each drive transmission path for transmitting the drive force from the same drive source (DC motor 101) to the paper feed roller 6 and the resist roller pair 7 which are different driven bodies is changed. Consider a configuration including the electromagnetic clutches 118 and 119 for switching. With this configuration, it is difficult to determine the presence or absence of an abnormality with high accuracy in the following cases.

That is, when all the drive transmission paths are set to the transmission state by the two electromagnetic clutches 118 and 119, the number of driven bodies (paper feed roller 6 and resist roller pair 7) connected to the DC motor 101 becomes two. , The inertia of the entire driven body (entire load) connected to the DC motor 101 becomes large. In this case, even when the electromagnetic clutches 118 and 119 are normal, the inertia of the entire load during driving is large, so that deceleration is difficult and the detected rotation speed of the DC motor 101 is difficult to deviate from the target rotation speed. Therefore, the error between the detected rotation speed of the DC motor 101 and the target rotation speed is small, and as shown in FIG. 5A, the integrated control amount H3 is small. As a result, when trying to determine the presence or absence of an abnormality by setting all the drive transmission paths in the transmission state by the two electromagnetic clutches 118 and 119, even if the electromagnetic clutches 118 and 119 are normal, the detected rotation speed and the integrated control amount H3 is close to the integrated control amount H4 at the time of abnormality shown in FIG. 5B, and it is difficult to determine the presence or absence of abnormality with high accuracy.

Therefore, in the present embodiment, a part (one) electromagnetic clutch is selected from the two electromagnetic clutches 118 and 119 as the abnormality judgment target, and the drive transmission path is driven by the selected one electromagnetic clutch (abnormality judgment target). The presence or absence of an abnormality in the one electromagnetic clutch (abnormality judgment target) is determined by using the integrated control amount (control amount information) when the transmission state is set.

In the following description, the case where the presence or absence of abnormality of the electromagnetic clutches 118 and 119 is determined by using the integral control amount will be described, but the detected rotation speed may be used instead of the integral control amount.
Further, here, the electromagnetic clutch 118, which is a drive transmission switching means on the drive transmission path, transmits the driving force from the same drive source (DC motor 101) to the paper feed roller 6 and the resist roller pair 7 which are driven bodies. Although 119 describes two cases, the configuration may include three or more drive transmission switching means.

[Failure diagnosis mode 1]
Hereinafter, an example of a process of selecting one electromagnetic clutch to be abnormally determined from the two electromagnetic clutches 118 and 119 in order and determining the presence or absence of an abnormality in all the electromagnetic clutches 118 and 119 (hereinafter, “fault diagnosis”). Mode 1 ”) will be described.

FIG. 6 is a flowchart showing a processing procedure for determining an abnormality of the electromagnetic clutches 118 and 119 in the failure diagnosis mode 1.
When an operator such as a user or a maintenance company operates an operation panel or the like to instruct the start of the failure diagnosis mode 1, the abnormality determination unit 140 starts the failure diagnosis mode 1 and first determines the motor control gain. The setting and the setting of the motor rotation speed (motor speed) are changed from the setting during normal driving (during image formation operation) to the setting for the failure diagnosis mode (S1). In this failure diagnosis mode 1, it is possible to use the setting at the time of normal driving as it is, but in order to determine the presence or absence of an abnormality with higher accuracy, the setting for the failure diagnosis mode is used.

The reason for using the setting for the failure diagnosis mode as the motor control gain is as follows.
FIG. 7A is a graph showing data of the integrated control amount when the setting for the failure diagnosis mode is used as the motor control gain when the electromagnetic clutch is normal.
FIG. 7B is a graph showing data of the integrated control amount when the setting during normal operation is used as the motor control gain when the electromagnetic clutch is normal.

In general, the motor control gain plays the role of a control factor for controlling the response sensitivity. Therefore, the motor control gain during normal operation (during image formation operation) is set while adjusting the balance between operation stability and responsiveness, and as a result, the integrated control amount is as shown in FIG. 7 (b). It may show a waveform (the part surrounded by an ellipse) in which the rising waveform is blunted. However, in order to determine the presence or absence of an abnormality in the electromagnetic clutch from the integral control amount with higher accuracy, the displacement of the integral control amount and the sensitivity of the signal (waveform) are important. Therefore, the blunted waveform of the rising waveform as shown in FIG. 7B is unsuitable for determining the presence or absence of an abnormality in the electromagnetic clutch from the integrated control amount. Therefore, for the motor control gain used in this failure diagnosis mode 1, the displacement at the integrated control amount and the sensitivity of the signal (waveform) as shown in FIG. 7A are not used as they are at the time of normal driving. Use the settings for the fault diagnosis mode tuned to obtain.

The reason for using the setting for the failure diagnosis mode as the motor rotation speed (motor speed) is as follows.
FIG. 8A is a graph showing an integral control amount when the setting for the failure diagnosis mode is used as the motor rotation speed (motor speed) when the electromagnetic clutch is normal.
FIG. 8B is a graph showing an integral control amount when the setting during normal operation is used as the motor rotation speed (motor speed) when the electromagnetic clutch is normal.

In general, the higher the motor rotation speed (faster motor speed), the larger the displacement of the integrated control amount, which is advantageous in determining the presence or absence of an abnormality in the electromagnetic clutch from the integrated control amount with high accuracy. Therefore, for the motor rotation speed used in the failure diagnosis mode 1, a setting for the failure diagnosis mode, which is higher than the setting at the time of normal driving, is used. As a result, as shown in FIG. 8A, the integral control amount obtained in the failure diagnosis mode shows a displacement larger than the integral control amount in the normal operation shown in FIG. 8B, and the integral control amount is large. Therefore, it is possible to determine with higher accuracy whether or not there is an abnormality in the electromagnetic clutch.

In this way, if the motor control gain setting and the motor rotation speed (motor speed) are set for the failure diagnosis mode (S1), then the abnormality determination unit 140 performs all electromagnetic waves through the control circuit 120. After the coupling of the clutches 118 and 119 is turned off (disengaged) (S2), the driving of the DC motor 101 is started to turn on (coupling) only the first electromagnetic clutch 118 (S3). Then, a failure diagnosis (determination of the presence or absence of abnormality) of the first electromagnetic clutch 118 is performed (S4).

The failure diagnosis in the failure diagnosis process 1 is performed as follows, for example, using the integrated control amount.
First, the abnormality determination unit 140 acquires the data of the control amount (integral control amount) of the integral control (I control) calculated by the PID operation from the controller 121 of the control circuit 120 as a feature amount. The board of the control circuit 120 is provided with an output terminal for outputting each control amount in PID control, and the abnormality determination unit 140 is electrically connected to this output terminal and is based on a signal output from this output terminal. It is possible to acquire the control amount data.

The acquired integral control amount data is the integral control amount data when the electromagnetic clutch 118 is in the connected state (on state). As the data of the integral control amount, the average value of the control amount (integral control amount) of the integral control (I control) output from the controller 121 within a predetermined period can be used. The abnormality determination unit 140 compares the data of the integrated control amount with the data of the integrated control amount in the normal state, and determines whether or not the difference is equal to or greater than a predetermined threshold value.

Here, the data of the integrated control amount in the normal state is acquired, for example, at the time of the production process of the product or when the electromagnetic clutch 118 is replaced with a new one after the user has used it. As an acquisition method, for example, after starting the rotation of the DC motor 101 and stabilizing the rotation speed, the integral control (I control) output from the controller 121 while the electromagnetic clutch 118 is in the engaged state (on state). Acquire the data of the control amount (integral control amount) of. Then, the abnormality determination unit 140 stops the rotation of the DC motor 101 after storing the acquired data in the memory. The data of the integral control amount in the normal state stored in the memory is, for example, the control amount of the integral control (I control) output from the controller 121 within a predetermined period when the electromagnetic clutch 118 is in the engaged state (ON state). The average value of (integral control amount) can be used.

The abnormality determination unit 140 reads the data of the integral control amount in the normal state from the memory, and if it is determined that the difference between the data of the current integral control amount and the data of the integral control amount in the normal time is equal to or more than a predetermined threshold value, the electromagnetic wave is transmitted. It is determined that the clutch 118 is abnormal (abnormal in the transmission state). On the other hand, when it is determined that the difference is less than a predetermined threshold value, it is determined that the electromagnetic clutch 118 is abnormal (abnormal in the transmission state). Then, the failure diagnosis result (abnormality determination result) is stored in the memory, and the failure diagnosis of the electromagnetic clutch 118 is completed.

In the failure diagnosis, not only the diagnosis using the integral control amount but also the control amount (proportional control amount) of the proportional control (P control) calculated by the PID calculation may be used together. Further, the failure diagnosis can be performed by using the detected rotation speed before the PID calculation is performed instead of such a control amount.

When the failure diagnosis of the electromagnetic clutch 118 is completed in this way, the electromagnetic clutch 118 is set to the released state (off state) (S5), and then only the remaining electromagnetic clutch 119 is turned on (connected) (S6). Then, for this electromagnetic clutch 119, a failure diagnosis (determination of the presence or absence of an abnormality) is performed (S7) in the same manner as in the case of the electromagnetic clutch 118 described above, and when the failure diagnosis is completed, the electromagnetic clutch 119 is released (off state). (S8).

After completing the failure diagnosis for the two electromagnetic clutches 118 and 119 as described above, the abnormality determination unit 140 reads the failure diagnosis result for each of the electromagnetic clutches 118 and 119 from the memory, and for each of the electromagnetic clutches 118 and 119. The failure diagnosis result is displayed on the operation panel or the like as shown in FIG. 9 (S9). At this time, if necessary, incidental information such as a part replacement location and a type of replacement part may be displayed on the operation panel or the like.

As described above, according to the fault diagnosis mode 1, each of the electromagnetic clutches 118 and 119 is connected one by one, and the presence or absence of an abnormality is determined for each of the electromagnetic clutches 118 and 119. As a result, the integrated control amount when the electromagnetic clutches 118 and 119 are normal becomes larger than in the case where the two electromagnetic clutches 118 and 119 are all connected to determine the presence or absence of an abnormality, resulting in an abnormality (abnormality in the transmission state). ) It becomes easier to distinguish from the one at the time. Therefore, the presence or absence of abnormality in the electromagnetic clutches 118 and 119 can be determined with high accuracy.

In particular, in this failure diagnosis mode 1, since failure diagnosis is performed for all electromagnetic clutches 118 and 119, processing time is long, but the presence or absence of a failure location is detected in a situation where an abnormality or a location where a failure is foreseen is not clear. Useful in some cases.

[Failure diagnosis mode 2]
Next, an example of a process for determining the presence or absence of an abnormality (hereinafter referred to as “fault diagnosis mode 2”) will be described for only one electromagnetic clutch selected from the two electromagnetic clutches 118 and 119.
In the following description, the same contents as the above-mentioned failure diagnosis mode 1 will be omitted as appropriate.

FIG. 10 is a flowchart showing a processing procedure for determining an abnormality of the electromagnetic clutches 118 and 119 in the failure diagnosis mode 2.
When an operator such as a user or a maintenance company operates an operation panel or the like to instruct the start of the failure diagnosis mode 2, the abnormality determination unit 140 starts the failure diagnosis mode 2 and the above-mentioned failure diagnosis mode 1 Similarly, the setting of the motor control gain and the setting of the motor rotation speed (motor speed) are set for the failure diagnosis mode (S11). Then, the abnormality determination unit 140 turns off (releases) the connection of all the electromagnetic clutches 118 and 119 through the control circuit 120 (S12).

Next, in the failure diagnosis mode 2, for example, as shown in FIG. 11, the numbers of all the electromagnetic clutches subject to abnormality determination are displayed on the screen of the operation panel or the like, and the operator operates the operation panel or the like. Then, the electromagnetic clutch for which the failure diagnosis is performed is selected (S13). The operation information of this selection instruction (here, it is assumed that the clutch 1 = the electromagnetic clutch 118 is selected) is sent from the operation panel or the like to the abnormality determination unit 140.

After that, the drive of the DC motor 101 is started, only the selected clutch 1 (electromagnetic clutch 118) is turned on (connected) (S14), and the failure diagnosis (determination of the presence or absence of abnormality) of the electromagnetic clutch 118 is performed. (S15). The failure diagnosis in the failure diagnosis mode 2 can perform the same processing as the failure diagnosis mode 1 described above. When the failure diagnosis of the electromagnetic clutch 118 is completed in this way, the electromagnetic clutch 118 is set to the released state (off state) (S16), and the failure diagnosis result for the electromagnetic clutch 118 is displayed on the operation panel or the like as shown in FIG. (S17).

As described above, according to the fault diagnosis mode 2, it is determined whether or not there is an abnormality in only the electromagnetic clutch 118 selected by the operator among the two electromagnetic clutches 118 and 119. As a result, it is possible to determine whether or not there is an abnormality only in the electromagnetic clutch that the operator presumes to be out of order from the paper jam or machine error number (error information), so it is possible to determine whether or not there is an abnormality in all the electromagnetic clutches. It is advantageous in that the processing time can be shortened as compared with the above-mentioned failure diagnosis mode 1.

[Failure diagnosis mode 3]
Next, as in the failure diagnosis mode 1 described above, the electromagnetic clutches to be determined for abnormality are selected one by one from the two electromagnetic clutches 118 and 119 in order, and the presence or absence of abnormality in all the electromagnetic clutches 118 and 119 is present. Another example of the process of determining the above (hereinafter referred to as “fault diagnosis mode 3”) will be described.
In the failure diagnosis mode 3, the failure diagnosis mode of the electromagnetic clutch is automatically executed during the machine recovery process when an error such as a paper jam or a machine error occurs during the operation of the image forming apparatus 100. More specifically, a predetermined type such as when the number of consecutive occurrences of paper jam of a predetermined type (paper jam type) exceeds a threshold value or when a machine error of a predetermined type (machine error number) occurs. When the start condition is satisfied, the fault diagnosis process of the electromagnetic clutch is executed.
In the following description, the same contents as the above-mentioned failure diagnosis mode will be omitted as appropriate.

FIG. 13 is a flowchart showing a processing procedure for determining an abnormality of the electromagnetic clutches 118 and 119 in the failure diagnosis mode 3.
If an error occurs during the operation of the image forming apparatus 100 (during the image forming operation) (S21) and the error is a machine error (S22-1), a machine reboot operation is executed as a process for resolving the error. (S23-1), after that, the abnormality determination unit 140 determines whether or not the generated machine error corresponds to a predetermined machine error number (S24-1). The predetermined machine error number is, for example, a number corresponding to a machine error that may occur due to an abnormality in the electromagnetic clutches 118 and 119 that are subject to abnormality determination.

When the generated machine error is an error corresponding to a predetermined machine error number (Yes in S24-1), the above-mentioned failure diagnosis mode 1 operation is executed (S26). On the other hand, if the generated machine error is not an error corresponding to a predetermined machine error number (No in S24-1), the machine recovery operation is executed (S28).

Further, when the generated error is a paper jam (S22-2), a jam recovery operation is executed as a process for resolving the error (S23-2), and then the abnormality determination unit 140 determines that the generated paper jam is caused. It is determined whether or not the paper jam corresponds to a predetermined jam type (S24-2). The predetermined jam type is, for example, a number corresponding to a paper jam that may occur due to an abnormality in the electromagnetic clutches 118 and 119 that are subject to abnormality determination.

If the generated paper jam is not a paper jam corresponding to a predetermined jam type (No in S24-2), the machine return operation is executed (S28). On the other hand, if the generated paper jam is a paper jam corresponding to a predetermined jam type (Yes in S24-2), then it is determined whether or not the number of consecutive occurrences of the paper jam exceeds the threshold value. (S25). If the number of consecutive occurrences of the generated paper jam does not exceed the threshold value (No in S25), the machine return operation is executed (S28). On the other hand, when the number of consecutive occurrences of the generated paper jam exceeds the threshold value (Yes in S25), the operation of the above-mentioned failure diagnosis mode 1 is executed (S26).

After the operation of the failure diagnosis mode 1 is executed in this way (S26), if a failure of the electromagnetic clutches 118 and 119 is found (Yes in S27), the operation of the image forming apparatus 100 is stopped (S29). ), Notify the repair company, or temporarily continue the image formation operation by the error mode. On the other hand, if no failure of the electromagnetic clutches 118 and 119 is found (No in S27), the operation of returning to the machine is executed (S28).

As described above, according to the failure diagnosis mode 3, it is possible to execute the failure diagnosis process for determining the presence or absence of an abnormality in the electromagnetic clutches 118 and 119 without any instruction operation by the operator.

[Failure diagnosis mode 4]
Next, as in the above-mentioned failure diagnosis mode 2, another example of the process of determining the presence or absence of an abnormality only in the electromagnetic clutch selected from the two electromagnetic clutches 118 and 119 (hereinafter, “fault diagnosis mode 4””. ) Will be explained.
In the failure diagnosis mode 4, the failure diagnosis process of the electromagnetic clutch is automatically executed during the machine recovery process when an error such as a paper jam or a machine error occurs during the operation of the image forming apparatus 100. More specifically, a predetermined type such as when the number of consecutive occurrences of paper jam of a predetermined type (paper jam type) exceeds the threshold value or when a machine error of a predetermined type (machine error number) occurs. When the start condition is satisfied, the failure diagnosis process is executed for the electromagnetic clutch corresponding to the generated paper jam or machine error.
In the following description, the same contents as the above-mentioned failure diagnosis mode will be omitted as appropriate.

FIG. 14 is a flowchart showing a processing procedure for determining an abnormality of the electromagnetic clutches 118 and 119 in the failure diagnosis mode 4.
If an error occurs during the operation of the image forming apparatus 100 (during the image forming operation) (S31) and the error is a machine error (S32-1), a machine reboot operation is executed as a process for resolving the error. (S33-1), after that, the abnormality determination unit 140 determines whether or not the generated machine error corresponds to a predetermined machine error number (S34-1).

If the generated machine error is not an error corresponding to a predetermined machine error number (No in S34-1), the machine recovery operation is executed (S40). On the other hand, if the generated machine error is an error corresponding to a predetermined machine error number (Yes in S34-1), and if the corresponding machine error number is No1 (S35-1), the machine error number is No1. The corresponding clutch 1 (electromagnetic clutch 118) is selected as an error determination target (S36-1). If the corresponding machine error number is No. 2 (S35-2), the clutch 2 (electromagnetic clutch 119) corresponding to the machine error number No. 2 is selected as an abnormality determination target (S36-2). Then, the operation of the failure diagnosis mode 2 described above is executed for the selected electromagnetic clutch (S38).

Further, when the generated error is a paper jam (S32-2), a jam recovery operation is executed as a process for resolving the error (S33-2), and then the abnormality determination unit 140 determines that the generated paper jam is caused. It is determined whether or not the paper jam corresponds to a predetermined jam type (S34-2).

If the generated paper jam is not a paper jam corresponding to a predetermined jam type (No in S34-2), the machine return operation is executed (S40). On the other hand, if the generated paper jam is a paper jam corresponding to a predetermined jam type (Yes in S34-2), processing according to the jam type is executed as follows.

If the corresponding jam type is type A (S35-3), the threshold TA corresponding to this type A is read out, and it is determined whether or not the number of consecutive occurrences of the paper jam of this type A exceeds the threshold TA. (S37-1). Then, if the number of consecutive occurrences of the type A paper jam does not exceed the threshold value TA (No in S37-1), the machine return operation is executed (S40). On the other hand, when the number of consecutive occurrences of the paper jam of the type A this time exceeds the threshold TA (Yes of S37-1), the clutch 1 (electromagnetic clutch 118) corresponding to the type A of the paper jam is subject to abnormality judgment. (S36-3), and the above-mentioned failure diagnosis mode 2 operation is executed for the selected electromagnetic clutch 118 (S38).

If the corresponding jam type is type B (S35-4), the threshold TB corresponding to this type B is read out, and whether or not the number of consecutive occurrences of the paper jam of type B this time exceeds the threshold TB. Is determined (S37-2). Then, if the number of consecutive occurrences of the type B paper jam this time does not exceed the threshold value TB (No in S37-2), the machine return operation is executed (S40). On the other hand, when the number of consecutive occurrences of the paper jam of the type B this time exceeds the threshold TB (Yes of S37-2), the clutch 2 (electromagnetic clutch 119) corresponding to the type B of the paper jam is subject to abnormality judgment. (S36-4), and the above-mentioned failure diagnosis mode 2 operation is executed for the selected electromagnetic clutch 119 (S38).

If the corresponding jam type is type C (S35-5), the threshold TC corresponding to this type C is read out, and whether or not the number of consecutive occurrences of the paper jam of this type C exceeds the threshold TC. Is determined (S37-3). Then, if the number of consecutive occurrences of the type C paper jam does not exceed the threshold value TC (No in S37-3), the machine return operation is executed (S40). On the other hand, when the number of consecutive occurrences of the paper jam of the type C this time exceeds the threshold TC (Yes of S37-3), the clutch 1 and the clutch 2 (electromagnetic clutches 118 and 119) corresponding to the type C of the paper jam ) Is selected as the abnormality determination target (S36-5), and the above-mentioned failure diagnosis mode 2 operation is executed for the selected electromagnetic clutches 118 and 119 (S38).

After the operation of the failure diagnosis mode 2 is executed in this way (S38), if a failure of the electromagnetic clutches 118 and 119 is found (Yes in S39), the operation of the image forming apparatus 100 is stopped (S41). ), Notify the repair company, or temporarily continue the image formation operation by the error mode. On the other hand, if no failure of the electromagnetic clutches 118 and 119 is found (No in S39), the operation of returning to the machine is executed (S40).

As described above, according to the failure diagnosis mode 4, it is possible to execute the failure diagnosis process for determining the presence or absence of an abnormality in the electromagnetic clutches 118 and 119 without any instruction operation by the operator.

In the present embodiment, the driven body is the paper feed roller 6 and the resist roller pair 7, but the present invention includes a paper feed roller 6, a resist roller pair 7, a secondary transfer roller 16, and the like. The same can be applied to other transport rollers that transport the paper 23. Further, not limited to such a transport roller, a latent image carrier such as a photoconductor drum 1Y, 1M, 1C, 1K, an intermediate transfer body such as an intermediate transfer belt 8, and development of a developing roller 3Y, 3M, 3C, 3K, etc. It can be similarly applied to other driven bodies mounted on the image forming apparatus such as an agent carrier.

Further, in the present embodiment, the drive transmission switching means has been described as an example of the electromagnetic clutches 118 and 119, but the present invention is the same for other drive transmission switching means such as an electromagnetic brake, a solenoid, a one-way clutch, and a torque limiter. Can be applied to.

The above description is an example, and the effect peculiar to each of the following aspects is exhibited.
[First aspect]
In the first aspect, the state of the drive transmission path for transmitting the driving force from the drive source (for example, DC motor 101) to the driven body (for example, the paper feed roller 6 and the resist roller pair 7) is set to a transmission state and a non-transmission state. The drive device 150 includes a drive transmission switching means for switching (for example, electromagnetic clutches 118 and 119) and an abnormality determination means (for example, an abnormality determination unit 140) for determining the presence or absence of an abnormality in the transmission state of the drive transmission switching means. As the drive transmission switching means, it corresponds to a plurality of drive transmission paths that transmit the drive force from the same drive source (for example, DC motor 101) to different driven bodies (for example, the paper feed roller 6 and the resist roller pair 7). A plurality of drive transmission switching means (for example, electromagnetic clutches 118 and 119) for switching the state of each drive transmission path between the transmission state and the non-transmission state are provided, and the abnormality determination means is among the plurality of drive transmission switching means. When a part of the drive transmission switching means is selected as the abnormality judgment target and the state of the drive transmission path is set to the transmission state by the selected abnormality judgment target, the drive information (for example, the detected rotation speed) of the drive source or the said It is characterized in that the presence or absence of an abnormality in the transmission state of the abnormality determination target is determined by using the control amount information (for example, the integral control amount) of the drive source generated from the drive information.

The drive transmission switching means for switching the state of the drive transmission path between the transmission state and the non-transmission state is slipped during the transmission state due to deterioration over time (a state in which the driving force from the drive source is not accurately transmitted to the driven body). Abnormality (abnormality in transmission state) occurs. When such an abnormality occurs in the transmission state, the drive information of the drive source used for the drive control of the drive source and the control amount information generated from the drive information (for example, the proportional control amount and the integral control amount) are included in the drive information. Changes appear different from normal.
For example, a specific example of determining slippage (abnormality in the transmission state) of the drive transmission switching means using the proportional control amount of PID control will be described. While the state of the drive transmission path is the transmission state, the drive source is constantly subjected to a load transmitted from the driven body side rather than the drive transmission switching means as a drive load. At this time, if slip occurs in the drive transmission switching means, the load on the driven body side is less likely to be transmitted to the drive source due to the slip than in the drive transmission switching means, and the drive is applied to the drive source after the drive amount is stabilized. The load will be small. As a result, the error (residual) between the drive amount and the target drive amount indicated by the drive information of the drive source after the drive amount of the drive source is stable is small, and the integral control amount generated from this drive information is small. Become. It should be noted that the driving amount of the driven body is abnormal because the target driving amount is not reached due to slippage.
On the other hand, when the drive transmission switching means is normal, slip does not occur, so that the load on the driven body side is directly transmitted to the drive source as compared with the drive transmission switching means, and the drive is driven after the drive amount is stabilized. The drive load applied to the source will be greater than if slippage were occurring. As a result, the error (residual) between the drive amount and the target drive amount indicated by the drive information of the drive source after the drive amount of the drive source is stable is larger than that in the case where slip occurs, and from this drive information. The amount of integral control generated is also large.
Therefore, it is possible to determine the presence or absence of an abnormality in the transmission state in the drive transmission switching means based on such a difference in the integrated control amount.

Here, in the configuration provided with a plurality of drive transmission switching means for switching the state of each drive transmission path, each corresponding to a plurality of drive transmission paths for transmitting the drive force from the same drive source to different driven bodies. In the following cases, it is difficult to determine with high accuracy the presence or absence of abnormalities in the transmission state.
When all the drive transmission paths are in the transmission state by the plurality of drive transmission switching means, the number of driven bodies connected to the drive source increases, so that the inertia of the entire driven body connected to the drive source increases. It will be big. Therefore, even when the drive transmission switching means is normal, the drive amount of the drive source after the drive amount of the drive source is stabilized is unlikely to decrease due to the large inertia of the entire driven body, and the target drive amount is not reduced. It is hard to shift from. Therefore, as the number of driven bodies connected to the drive source increases, the error (residual) between the drive amount of the drive source and the target drive amount becomes smaller, and the integral control amount becomes smaller. Therefore, when trying to determine the presence or absence of an abnormality in the transmission state by setting all the drive transmission paths in the transmission state by a plurality of drive transmission switching means, the integral control amount when the drive transmission switching means is normal causes slippage. It becomes difficult to judge the presence or absence of slip with high accuracy because the value is close to the integral control amount in the case of.

In addition, although the specific example of determining the slip (abnormality in the transmission state) of the drive transmission switching means by using the proportional control amount of PID control has been described here, the drive information of the drive source and other than the proportional control amount are described. The same applies when the judgment is made using the control amount information. That is, even when the judgment is made using the drive information of the drive source or other control amount information, if all the drive transmission paths are set to the transmission state by a plurality of drive transmission switching means and the presence or absence of the abnormality in the transmission state is determined. When the drive transmission switching means is normal, the drive information and other control amount information have values close to those when slip occurs, and it may be difficult to determine the presence or absence of slip with high accuracy.

In this embodiment, drive information or control when a part of the drive transmission switching means is selected as an abnormality determination target from a plurality of drive transmission switching means and the drive transmission path is set to the transmission state by the selected abnormality determination target. Using the amount information, it is possible to determine the presence or absence of slippage (abnormality in the transmission state) of some of the drive transmission switching means that are the targets of the abnormality determination. As a result, the drive transmission switching means are normal and slip (transmission state), rather than the case where all the drive transmission paths are set to the transmission state by a plurality of drive transmission switching means and the presence or absence of slip (abnormality in the transmission state) is determined. It is possible to increase the difference in drive information and control amount information between the case where an abnormality occurs (time abnormality), and it becomes easier to determine the presence or absence of an abnormality during the transmission state. Therefore, even in a configuration provided with a plurality of drive transmission switching means for switching the state of each drive transmission path that transmits the drive force from the same drive source to different driven bodies, the presence or absence of an abnormality in the transmission state can be determined with high accuracy. can do.

[Second aspect]
The second aspect is characterized in that, in the first aspect, the abnormality determination means sequentially selects the abnormality determination target one by one from the plurality of drive transmission switching means.
According to this, it is possible to determine with high accuracy whether or not there is an abnormality in all of the plurality of drive transmission switching means as in the above-mentioned failure diagnosis mode 1.

[Third aspect]
In the third aspect, in the second aspect, when the error information (for example, paper jam, machine error) generated during the normal driving of operating the driven body satisfies the predetermined start condition, the abnormality determination means has the plurality. The drive transmission switching means of the above is characterized in that it is determined whether or not there is an abnormality in the transmission state.
According to this, as in the above-mentioned failure diagnosis mode 3, the presence or absence of an abnormality in all of the plurality of drive transmission switching means is determined at an appropriate timing when an abnormality in the plurality of drive transmission switching means is suspected. It can be judged with high accuracy.

[Fourth aspect]
The fourth aspect has the acquisition means (for example, an operation panel) for acquiring the selection information (for example, the operation information of the operator's selection instruction) for selecting the abnormality determination target in the first aspect, and the abnormality determination. The means is characterized in that an abnormality determination target indicated by selection information acquired by the acquisition means is selected from the plurality of drive transmission switching means.
According to this, as in the above-mentioned failure diagnosis mode 2, only the drive transmission switching means suspected of having an abnormality can be selected from the plurality of drive transmission switching means, and the presence or absence of the abnormality can be determined with high accuracy. The processing time can be shortened.

[Fifth aspect]
A fifth aspect is, in the first aspect, the abnormality determining means has information on an error (for example, paper jam, machine error) that has occurred during normal driving for operating the driven body for each of the plurality of drive transmission switching means. Is characterized by determining whether or not a predetermined start condition is satisfied, and determining whether or not there is an abnormality in the transmission state of the drive transmission switching means satisfying the predetermined start condition.
According to this, as in the above-mentioned failure diagnosis mode 4, it is possible to automatically determine the presence or absence of an abnormality in the drive transmission switching means suspected of having an abnormality among the plurality of drive transmission switching means, and process the process. The time can be shortened.

[Sixth aspect]
A sixth aspect is, in any one of the first to fifth aspects, the abnormality determining means has a larger driving amount (when determining the presence or absence of an abnormality in the transmission state, than during normal driving in which the driven body is operated. For example, in a state where the drive source is driven at a high rotation speed (high rotation speed), the drive information or the control amount information when the state of the drive transmission path is set to the transmission state by the abnormality determination target is used. It is characterized by.
According to this, the presence or absence of an abnormality in the drive transmission switching means can be determined from the drive information or the control amount information including the sign of the abnormality more prominently, so that the presence or absence of the abnormality in the drive transmission switching means can be determined with higher accuracy. can.

[7th aspect]
A seventh aspect is, in any one of the first to sixth aspects, the drive control means is a control amount generated from drive information (for example, detected rotation speed) and control adjustment value (for example, motor control gain) of the drive source. The drive source is controlled based on information (for example, an integrated control amount), and the abnormality determining means adjusts the control different from that during normal driving in which the driven body is operated when determining the presence or absence of an abnormality in the transmission state. The drive information or the control amount when the state of the drive transmission path is set to the transmission state by the drive transmission switching means in a state where the drive source is driven based on the control amount information generated by using the value. It is characterized by using information.
According to this, the presence or absence of an abnormality in the drive transmission switching means can be determined from the drive information or the control amount information including the sign of the abnormality more prominently, so that the presence or absence of the abnormality in the drive transmission switching means can be determined with higher accuracy. can.

[8th aspect]
In the eighth aspect, the state of the drive transmission path for transmitting the driving force from the drive source (for example, DC motor 101) to the driven body (for example, the paper feed roller 6 and the resist roller pair 7) is set to a transmission state and a non-transmission state. A drive device 150 having a drive transmission switching means for switching (for example, electromagnetic clutches 118 and 119) and an abnormality determination means (for example, an abnormality determination unit 140) for determining the presence or absence of an abnormality in the transmission state of the drive transmission switching means. The abnormality determining means is driven by the drive transmission switching means in a state where the drive source is driven with a drive amount (for example, a high rotation speed and a high rotation speed) larger than that during normal drive for operating the driven body. The drive information (for example, detected rotation speed) of the drive source when the state of the transmission path is set to the transmission state or the control amount information (for example, integral control amount) of the drive source generated from the drive information is used. It is characterized in that it is determined whether or not there is an abnormality in the transmission state of the drive transmission switching means.
According to this aspect, the presence or absence of an abnormality in the drive transmission switching means can be determined from the drive information or the control amount information including the sign of the abnormality more prominently, so that the presence or absence of the abnormality in the drive transmission switching means can be determined with higher accuracy. Can be done.

[9th aspect]
In the ninth aspect, the state of the drive transmission path for transmitting the driving force from the drive source (for example, DC motor 101) to the driven body (for example, the paper feed roller 6 and the resist roller pair 7) is set to a transmission state and a non-transmission state. Drive to control the drive source based on the drive transmission switching means (for example, electromagnetic clutches 118 and 119) and the control amount information (for example, integrated control amount) generated from the drive information (for example, detected rotation speed) of the drive source. A drive device 150 having a control means (for example, a control circuit 120 and a driver circuit 125) and an abnormality determination means (for example, an abnormality determination unit 140) for determining the presence or absence of an abnormality in a transmission state of the drive transmission switching means. The abnormality determining means drives the drive source based on control amount information (for example, integrated control amount) generated using a control adjustment value (for example, motor control gain) different from that at the time of normal drive for operating the driven body. Whether or not there is an abnormality in the transmission state of the drive transmission switching means by using the drive information or the control amount information when the state of the drive transmission path is set to the transmission state by the drive transmission switching means in the state of being engaged. It is characterized by judging.
According to this aspect, the presence or absence of an abnormality in the drive transmission switching means can be determined from the drive information or the control amount information including the sign of the abnormality more prominently, so that the presence or absence of the abnormality in the drive transmission switching means can be determined with higher accuracy. Can be done.

[10th aspect]
A tenth aspect is an image forming apparatus 100 including a driven body (for example, a paper feed roller 6 and a resist roller pair 7) driven by a driving device, and the driving device is any one of the first to ninth aspects. The driving device 150 is used.
According to this aspect, it is possible to provide an image forming apparatus capable of determining an abnormality in a transmission state of a drive transmission switching means with high accuracy.

[11th aspect]
The eleventh aspect is characterized in that, in the tenth aspect, it has a notification means (for example, an operation panel or the like) for notifying the determination result of the abnormality determination means in the drive device.
According to this, it is possible to inform the operator of the determination result of the abnormality in the transmission state of the drive transmission switching means.

1: Photoreceptor drum 2: Developing device 4: Exposure device 5: Paper storage cassette 6: Paper feed roller 7: Resist roller pair 8: Intermediate transfer belt 9: Primary transfer bias roller 16: Secondary transfer roller 17: Fixing unit 18 : Paper ejection roller pair 23: Paper 30: Main body control unit 31: Memory 100: Image forming apparatus 101: DC motor 102: Output shaft 102a: Gear 103: Encoder 111-117: Drive transmission gear 118, 119: Electromagnetic clutch 120: Control circuit 121: Controller 122: PWM conversion unit 123: Speed detection unit 125: Driver circuit 130: Target speed setting unit 140: Abnormality determination unit 150: Drive device

Japanese Unexamined Patent Publication No. 2019-132875

Claims (11)

A drive transmission switching means for switching the state of the drive transmission path for transmitting the drive force from the drive source to the driven body between a transmission state and a non-transmission state,
A drive device having an abnormality determining means for determining the presence or absence of an abnormality in the transmission state of the drive transmission switching means.
As the drive transmission switching means, each of a plurality of drive transmission paths that transmit the drive force from the same drive source to different driven bodies is supported, and the state of each drive transmission path is switched between a transmission state and a non-transmission state. Equipped with multiple drive transmission switching means
When the abnormality determination means selects a part of the drive transmission switching means as the abnormality determination target from the plurality of drive transmission switching means and sets the state of the drive transmission path to the transmission state by the selected abnormality determination target. The drive device is characterized in that the presence or absence of an abnormality in a transmission state of the abnormality determination target is determined by using the drive information of the drive source or the control amount information of the drive source generated from the drive information. In the drive device according to claim 1,
The abnormality determination means is a drive device characterized in that the abnormality determination target is sequentially selected one by one from the plurality of drive transmission switching means. In the drive device according to claim 2,
When the error information generated during normal driving for operating the driven body satisfies a predetermined start condition, the abnormality determining means determines whether or not there is an abnormality in the transmission state for the plurality of drive transmission switching means. A drive device characterized by. In the drive device according to claim 1,
It has an acquisition means for acquiring selection information for selecting the abnormality determination target, and has an acquisition means.
The abnormality determination means is a drive device comprising selecting an abnormality determination target indicated by selection information acquired by the acquisition means from the plurality of drive transmission switching means. In the drive device according to claim 1,
The abnormality determining means determines whether or not the error information generated during normal driving for operating the driven body satisfies a predetermined start condition for each of the plurality of drive transmission switching means, and determines whether or not the predetermined start condition is satisfied. A drive device comprising determining whether or not there is an abnormality in the transmission state of a drive transmission switching means that satisfies the conditions. The drive device according to any one of claims 1 to 5.
When determining the presence or absence of an abnormality in the transmission state, the abnormality determination means drives the drive source with a drive amount larger than that in the normal drive for operating the driven body, and the abnormality determination target determines the presence or absence of the abnormality. A drive device characterized in that the drive information or the control amount information when the state of the drive transmission path is set to the transmission state is used. The drive device according to any one of claims 1 to 6.
It has a drive control means for controlling the drive source based on the drive information of the drive source and the control amount information generated from the control adjustment value.
When determining the presence or absence of an abnormality in the transmission state, the abnormality determination means uses the control amount information generated using a control adjustment value different from that in the normal drive for operating the driven body to drive the drive source. A drive device characterized in that the drive information or the control amount information when the state of the drive transmission path is set to the transmission state by the drive transmission switching means in the driven state is used. A drive transmission switching means for switching the state of the drive transmission path for transmitting the drive force from the drive source to the driven body between a transmission state and a non-transmission state,
A drive device having an abnormality determining means for determining the presence or absence of an abnormality in the transmission state of the drive transmission switching means.
The abnormality determining means sets the state of the drive transmission path into a transmission state by the drive transmission switching means in a state where the drive source is driven with a drive amount larger than that during normal drive for operating the driven body. The drive device is characterized in that the presence or absence of an abnormality in the transmission state of the drive transmission switching means is determined by using the drive information of the drive source or the control amount information of the drive source generated from the drive information. .. A drive transmission switching means for switching the state of the drive transmission path for transmitting the drive force from the drive source to the driven body between a transmission state and a non-transmission state,
A drive control means for controlling the drive source based on the drive information of the drive source and the control amount information generated from the control adjustment value, and
A drive device having an abnormality determining means for determining the presence or absence of an abnormality in the transmission state of the drive transmission switching means.
The abnormality determining means is driven by the drive transmission switching means in a state where the drive source is driven based on the control amount information generated by using a control adjustment value different from that at the time of normal drive for operating the driven body. A drive device characterized in that the presence or absence of an abnormality in the transmission state of the drive transmission switching means is determined by using the drive information or the control amount information when the state of the drive transmission path is in the transmission state. An image forming apparatus having a driven body driven by a driving device.
An image forming apparatus according to any one of claims 1 to 9, wherein the driving device according to any one of claims 1 to 9 is used as the driving device. In the image forming apparatus according to claim 10,
An image forming apparatus comprising a notifying means for notifying a determination result of the abnormality determining means in the driving device.

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