JP6984537B2 - Image processing device - Google Patents

Description

The present invention relates to an image processing device that performs control to keep the rotational position of a motor constant.

An image processing device such as an image forming device, an image reading device, or a multifunction device includes a motor for driving a mechanism for transporting a recording material on which an image is formed in the image forming device, a mechanism for transporting a document in an image reading device, and the like.

For example, the mechanism for transporting the recording material includes a resist roller for suspending the recording material. When the motor is a drive source for a mechanism such as the resist roller, a motor control device controls the motor through a motor driver.

The motor control device outputs a control signal so that the rotation position of the motor specified based on the rotation detection signal from the sensor that detects the rotation of the motor satisfies the target condition. The motor driver supplies electric power corresponding to the control signal to the motor.

The motor driver executes an interlock control for stopping power supply to the motor when the lock condition of the motor is satisfied. The lock condition is a condition that the state in which the control signal and the rotation detection signal do not change while the power is being supplied to the motor continues for a predetermined time.

The interlock control is a control for avoiding excessive heat generation and failure of the motor due to continuous power supply to the motor under a situation where the motor is in a locked state.

Further, the motor control device may execute holding control for holding the rotational position of the motor constant while supplying power to the motor. It is desired to avoid the interlock control by the motor driver being executed while the motor control device is executing the holding control.

For example, it is known that the motor control device changes the control signal in a time shorter than the predetermined time while the holding control is being executed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-109803

By the way, when the motor control device executes the holding control in a state where an external force is applied to the motor, when the motor driver continues to supply electric power to the motor, the electric power causes the temperature of the motor. Consumed to raise. Such power consumption is wasteful.

Further, when the holding control is executed with an external force applied to the motor and the power supply to the motor is stopped by the interlock control or the like, the motor may rotate due to the external force. .. It is dangerous for the motor to rotate unintentionally in this way.

An object of the present invention is to reduce the power consumption of the motor when the control for keeping the rotation position of the motor constant is executed, and to cause the motor whose power supply is stopped to rotate unintentionally due to an external force. The purpose is to provide an image processing device that can be prevented.

The image processing device according to one aspect of the present invention includes a motor, a motor driver, a motor control device, and a brake device. The motor drives a mechanism related to image processing. The motor driver supplies electric power according to the control signal to the motor, and it is predetermined that the control signal and the rotation detection signal that changes according to the rotation of the motor do not change while the power is supplied to the motor. When the lock condition of continuing for the reference time is satisfied, the power supply to the motor is stopped. The motor control device outputs the control signal corresponding to the rotation detection signal to the motor driver. The brake device keeps the motor in a stopped state against an external force applied to the rotation shaft of the motor when an operation signal is input. When the motor control device executes holding control for holding the rotation position of the motor constant, the first holding until the rotation detection signal satisfies a predetermined target condition before the lock condition is satisfied. The control signal corresponding to the rotation detection signal is output to the motor driver while the power is supplied to the motor during the period, and the brake is used in the second holding period after the rotation detection signal satisfies the target condition. The operation signal is output to the device, and the stop control signal, which is the control signal for stopping the power supply to the motor, is output to the motor driver.

According to the present invention, the power consumption of the motor when the control for keeping the rotation position of the motor constant is executed is reduced, and the motor whose power supply is stopped is unintentionally rotated by an external force. It becomes possible to provide an image processing device that can be prevented.

FIG. 1 is a configuration diagram of an image processing device according to an embodiment. FIG. 2 is a block diagram of a motor control-related device in the image processing device according to the embodiment. FIG. 3 is a flowchart showing an example of the procedure of motor holding control in the image processing apparatus according to the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples that embody the present invention, and do not limit the technical scope of the present invention.

[Configuration of image processing device 10]
The image processing apparatus 10 according to the embodiment is an apparatus that executes image processing such as a printing process for forming an image on a sheet 92 and an image reading process for reading an image from a document 91 (see FIG. 1).

As shown in FIG. 1, the image processing device 10 controls an image forming device 2 that executes the printing process, an image reading device 1 that executes the image reading process, an image forming device 2 and an image reading device 1. The control device 8 is provided.

For example, the image processing device 10 is a copying machine, a facsimile machine, a multifunction device, or the like. In the present embodiment, the image forming apparatus 2 is a printer that executes the printing process by an electrophotographic method.

The image to be printed is an image read by the image reading device 1 and an image represented by print data received from a host device (not shown). The sheet 92 is an image recording medium, such as paper or a synthetic resin sheet.

The control device 8 executes various data processes related to the print processing job and the like, and further controls various electric devices.

As shown in FIG. 1, the image reading device 1 includes a platen glass 13, an image sensor unit 110, a movable support device 11, a platen cover 12, and the like.

The platen cover 12 covers the platen glass 13 and the document 91 on the platen glass 13. The image reading device 1 further includes an ADF (Auto Document Feeder) 14 incorporated in the platen cover 12.

The ADF 14 includes a plurality of document transfer rollers 141, a document sensor 142, and a document transfer motor M1. The document sensor 142 detects the document 91 at a predetermined position on the document transport path 140.

The plurality of document transport rollers 141 are mechanisms for transporting the document 91 along the document transport path 140 by being rotationally driven. The document transfer motor M1 is a drive source for driving a plurality of document transfer rollers 141.

The control device 8 controls the operating state of the document transfer motor M1 according to the timing when the document 91 is detected by the document sensor 142.

The manuscript 91 is placed on the platen glass 13 or conveyed by the ADF 14. The image sensor unit 110 executes the scanning process for the document 91 on the platen glass 13 or the scanning process for the document 91 conveyed by the ADF 14.

The image forming apparatus 2 executes the print processing based on the image read from the document 91 by the image reading apparatus 1 or the print processing based on the image represented by the print data received from another apparatus.

As shown in FIG. 1, the image forming apparatus 2 includes a sheet conveying apparatus 3 and a printing processing apparatus 4. The sheet transfer device 3 sends the sheet 92 from the sheet accommodating portion 20 to the sheet transfer path 30, and further conveys the sheet 92 along the sheet transfer path 30.

The sheet transfer device 3 includes a plurality of sheet transfer rollers 31, a sheet sensor 32, and a sheet transfer motor M2. The plurality of sheet transport rollers 31 include a resist roller 31a that suspends the sheet 92. The seat sensor 32 detects the seat 92 at a predetermined position on the seat transport path 30.

The plurality of sheet transport rollers 31 are mechanisms for transporting the sheet 92 along the sheet transport path 30 by being rotationally driven. The seat transfer motor M2 is a drive source for driving a plurality of sheet transfer rollers 31. The sheet transfer motor M2 is an example of a recording material transfer motor.

The control device 8 controls the operating state of the seat transfer motor M2 according to the timing when the seat 92 is detected by the seat sensor 32.

The print processing device 4 includes an image forming device 4x, a laser scanning unit 40, a transfer device 44, and a fixing device 46.

In the image forming apparatus 4x, the drum-shaped photoconductor 41 rotates, and the charging device 42 uniformly charges the surface of the photoconductor 41. Further, the laser scanning unit 40 writes an electrostatic latent image on the surface of the charged photoconductor 41.

Further, the developing device 43 of the image forming device 4x develops the electrostatic latent image into a toner image. The transfer device 44 transfers the toner image on the surface of the photoconductor 41 to the sheet 92. Subsequently, the fixing device 46 heats and pressurizes the toner image on the sheet 92 to fix the toner image on the sheet 92.

The image forming apparatus 2 shown in FIG. 1 has a tandem type printing processing apparatus 4. Therefore, the print processing device 4 includes four image forming devices 4x corresponding to toners of different colors. Further, the transfer device 44 includes four primary transfer devices 441, an intermediate transfer belt 440 and a secondary transfer device 442.

The four image forming devices 4x include a photoconductor 41, a charging device 42, and a developing device 43, respectively. The four image forming devices 4x form the toner images of cyan, magenta, yellow and black on the surface of the photoconductor 41, respectively.

In each of the image forming apparatus 4x, the primary transfer apparatus 441 transfers the toner image from the photoconductor 41 to the intermediate transfer belt 440. As a result, a color image composed of the toner images of four colors is formed on the intermediate transfer belt 440.

The secondary transfer device 442 transfers the toner images of the four colors on the intermediate transfer belt 440 to the sheet 92.

In the following description, the document transfer motor M1 and the sheet transfer motor M2 are collectively referred to as a motor M0. The motor M0 drives a mechanism related to the image processing.

In the present embodiment, the motor M0 is a DC motor. For example, it is conceivable that the motor M0 is a brushless DC motor. Hereinafter, the configuration related to the control of the motor M0 will be described.

As shown in FIG. 2, the control device 8 includes a motor controller 81 and a motor driver 82 as components related to the control of the motor M0. The motor controller 81 is a motor control device that controls the motor M0 through the motor driver 82.

For example, the motor controller 81 includes an MPU (Micro Processing Unit), a RAM (Random Access Memory), a secondary storage device, a communication device, and the like. The MPU is an example of a processor. The RAM is a computer-readable volatile storage device. The secondary storage device is a computer-readable non-volatile storage device.

The MPU controls the motor driver 82 by executing a program stored in advance in the secondary storage device. At that time, the MPU loads the program into the RAM, and further temporarily stores the data generated or referenced in the process of executing the program in the RAM.

Further, the MPU outputs a control signal SC0 to the motor driver 82 through the communication device. The control signal SC0 is a direction control signal instructing the rotation direction of the motor M0, a drive control signal instructing to supply electric power to the motor M0, a stop control signal instructing to stop power supply to the motor M0, and a motor. Includes a power control signal that indicates the power supplied to M0.

The power control signal is a signal that supports the power supplied to the motor M0. For example, it is conceivable that the power control signal is a PWM (Pulse Width Modulation) signal. The stop control signal is an example of the control signal SC0 for stopping the power supply to the motor M0.

The motor controller 81 may be realized by another processor such as a DSP (Digital Signal Processor).

The motor driver 82 is realized by a circuit such as an ASIC (Application Specific integrated Circuit).

The motor driver 82 supplies electric power corresponding to the control signal SC0 to the motor M0. Specifically, the motor driver 82 supplies a current to the motor M0 when receiving the drive control signal from the motor controller 81, and supplies a current to the motor M0 when receiving the stop control signal from the motor controller 81. To stop.

Further, when the motor driver 82 receives the drive control signal, the motor driver 82 supplies a current having a magnitude corresponding to the power control signal to the motor M0. At that time, the motor driver 82 outputs the current to the motor M0 so as to flow in the direction corresponding to the direction control signal.

As shown in FIG. 2, the image processing device 10 includes a rotation sensor 80 that detects the rotation of the motor M0 and outputs a detection signal. Hereinafter, the detection signal of the rotation sensor 80 is referred to as a rotation detection signal SD0. The rotation detection signal SD0 is a signal that changes according to the rotation of the motor M0.

For example, the rotation sensor 80 is an encoder or Hall element that outputs a pulse signal each time the rotation axis MS0 of the motor M0 or the rotating body interlocking with the rotation axis MS0 rotates by a predetermined unit angle. In this case, the pulse signal is the rotation detection signal SD0.

The motor controller 81 outputs a control signal SC0 corresponding to the rotation detection signal SD0 to the motor driver 82.

The motor controller 81 may control the motor M0 in the speed control mode or may control the motor M0 in the holding control mode. The speed control mode is an operation mode for controlling the rotation speed of the motor M0 to approach a preset target speed. The holding control mode is an operation mode for performing motor holding control for holding the rotation position of the motor M0 at a predetermined target position while supplying power to the motor M0.

In the speed control mode, the motor controller 81 executes feedback control based on the comparison between the rotation speed of the motor M0 and the preset target speed. On the other hand, in the holding control mode, the motor controller 81 executes feedback control based on the comparison between the rotation position of the motor M0 and the target position.

In the speed control mode, the motor controller 81 specifies the rotation speed of the motor M0 based on the rotation detection signal SD0 from the rotation sensor 80, and corresponds to the difference between the specified rotation speed and the preset target speed. The power control signal of the control signal SC0 is adjusted.

On the other hand, in the holding control mode, the rotation position of the motor M0 is specified based on the rotation detection signal SD0 from the rotation sensor 80, and the control signal SC0 is described according to the difference between the specified rotation position and the target position. The direction control signal is set, and the power control signal of the control signal SC0 is adjusted.

Further, the motor driver 82 executes the interlock control when the drive control signal is received. When the motor driver 82 receives the drive control signal, the power is being supplied from the motor driver 82 to the motor M0.

In the interlock control, when the lock condition that the control signal SC0 and the rotation detection signal SD0 do not change while the power is being supplied to the motor M0 is maintained for a predetermined reference time, the motor M0 is satisfied. Stop supplying power to.

The interlock control is a control for avoiding excessive heat generation and failure of the motor M0 due to continuous power supply to the motor M0 under a situation where the motor M0 is in the locked state.

When the power supply to the motor M0 is stopped by the interlock control, the motor driver 82 cannot control the motor M0 until it is reset.

That is, in the speed control mode, a state in which the control signal SC0 and the rotation detection signal SD0 do not change for a long time while feeding power to the motor M0 is an abnormality such as a state in which an excessive load is applied to the motor M0. It is in a state of being. By performing the interlock control, it is possible to avoid the occurrence of a situation in which the motor M0 excessively generates heat or fails in such an abnormal state.

On the other hand, in the holding control mode, when the rotation position of the motor M0 coincides with the target position, it is normal that the control signal SC0 and the rotation detection signal SD0 do not change during the power supply to the motor M0. ..

Therefore, when the motor M0 is normally controlled in the holding control mode, it is necessary to avoid a situation in which the motor driver 82 stops supplying power to the motor M0 due to the interlock control.

By the way, when the motor controller 81 executes the motor holding control in a state where an external force is applied to the motor M0, when the motor driver 82 continues to supply electric power to the motor M0, the electric power causes the temperature of the motor M0. Consumed to raise. Such power consumption is wasteful.

Further, when the motor holding control is executed with the external force applied to the motor M0, if the power supply to the motor M0 is stopped by the interlock control or the like, the motor M0 may rotate due to the external force. be. It is dangerous for the motor M0 to rotate unintentionally in this way.

In the holding control mode, the motor controller 81 executes the motor holding control shown in FIG. The motor holding control is a control for keeping the rotational position of the motor M0 constant. As a result, the image processing device 10 can reduce the power consumption of the motor M0 when the motor holding control is executed, and can prevent the motor M0 whose power supply is stopped from unintentionally rotating due to an external force.

As shown in FIG. 2, the image processing device 10 further includes a regenerative braking circuit 83 and an external braking device 7.

The regenerative brake circuit 83 and the external brake device 7 hold the motor M0 in a stopped state against an external force applied to the rotation shaft MS0 of the motor M0 when the operation signals SC1 and SC2 are input from the motor controller 81.

When the first operation signal SC1 is input, the regenerative brake circuit 83 cuts off the power supply line from the motor driver 82 to the motor M0 and short-circuits the power input terminal of the motor M0. As a result, the regenerative brake circuit 83 operates the motor M0 as a generator.

For example, the regenerative brake circuit 83 short-circuits the pair of power input terminals of the motor M0 to the ground potential or the output terminal of the DC power supply when the first operation signal SC1 is input. The regenerative brake circuit 83 is an example of a regenerative brake device.

The regenerative brake circuit 83 connects the power supply line from the motor driver 82 to the motor M0 in a state where the first operation signal SC1 is not input.

When the second operation signal SC2 is input, the external brake device 7 exerts a braking force on the rotating shaft MS0 of the motor M0 or the rotating body interlocking with the rotating shaft MS0. For example, the external brake device 7 is an electromagnetic brake device or the like.

The external brake device 7 releases the action of the braking force on the rotating body linked to the rotating shaft MS0 or the rotating shaft MS0 in a state where the second operation signal SC2 is not input.

The braking force for the motor M0 by the external braking device 7 is stronger than the braking force for the motor M0 by the regenerative braking circuit 83.

Hereinafter, an example of the motor holding control procedure will be described with reference to the flowchart shown in FIG. In the following description, S1, S2, ... Represent the identification code of a plurality of steps in the motor holding process.

<Process S1>
In the holding control mode, the motor controller 81 acquires the rotation detection signal SD0 from the rotation sensor 80 at any time. Further, the motor controller 81 determines whether or not the rotation detection signal SD0 satisfies a predetermined target condition.

For example, the target condition is a condition that the state in which the rotation detection signal SD0 and the position error based on the target position are within a predetermined allowable position range continues for a predetermined target time or longer. The position error is the difference between the rotation position of the motor M0 specified by the rotation detection signal SD0 and the target position. The target time is shorter than the reference time.

When the motor controller 81 determines that the rotation detection signal SD0 satisfies the target condition, the process shifts to the process S3, and when not, the process shifts to the step S2.

<Process S2>
In step S2, the motor controller 81 outputs the direction signal of the control signal SC0 according to the direction of the position error to the motor driver 82. Further, the motor controller 81 adjusts the power control signal of the control signal SC0 according to the magnitude of the position error, and outputs the adjusted power control signal to the motor driver 82.

The motor controller 81 shifts the process from the process S2 to the process S1. As a result, the processes of steps S1 and S2 are repeated until the rotation detection signal SD0 satisfies the target condition.

In a situation where the processes of steps S1 and S2 are repeated, the power control signal of the control signal SC0 changes at any time. Therefore, the power supply to the motor M0 is not stopped by the interlock control of the motor driver 82.

<Process S3>
In step S3, the motor controller 81 determines the load state of the motor M0 based on the content of the power control signal of the control signal SC0.

In the present embodiment, the motor controller 81 specifies the motor power supply amount, which is the magnitude of the power supplied to the motor M0 corresponding to the power control signal. For example, for the motor feeding amount, the duty ratio of the power control signal, which is a PWM signal, or the moving average value of the duty ratio is specified as the motor feeding amount.

Then, the motor controller 81 determines that the load of the motor M0 is no load when the motor feeding amount is lower than the predetermined first threshold value.

In the present embodiment, the condition that the motor feeding amount corresponding to the power control signal is lower than the first threshold value is an example of a predetermined no-load condition.

Similarly, in the motor controller 81, when the motor feeding amount exceeds the first threshold value and falls below the second threshold value larger than the first threshold value, the load of the motor M0 is low. Judge that there is.

The second threshold value is set within a range in which the torque output by the motor M0 to which the electric power corresponding to the second threshold value is supplied is balanced with the braking force with respect to the motor M0 by the regenerative braking circuit 83.

Further, the motor controller 81 determines that the load of the motor M0 is a high load when the motor feeding amount exceeds the second threshold value.

Then, when the motor controller 81 determines that the load of the motor M0 is the no load, the process shifts to the step S6, and when it is determined that the load of the motor M0 is the low load, the process is performed. The process is shifted to S4, and when it is determined that the load of the motor M0 is the high load, the process is shifted to the step S5.

<Process S4>
In step S4, the motor controller 81 outputs the first operation signal SC1 to the regenerative brake circuit 83. As a result, the regenerative brake by the regenerative brake circuit 83 acts on the motor M0. After that, the motor controller 81 shifts the process to step S6.

<Process S5>
In step S5, the motor controller 81 outputs the second operation signal SC2 to the external brake device 7. As a result, the brake by the external brake device 7 acts on the motor M0. After that, the motor controller 81 shifts the process to step S6.

<Process S6>
In step S6, the motor controller 81 outputs the stop control signal to the motor driver 82. After that, the motor controller 81 shifts the process to step S7.

By the process of step S6, the motor driver 82 stops the power supply to the motor M0 and also stops the interlock control.

When the rotation detection signal SD0 satisfies the target condition, the processes from step S1 to step S6 are executed in a time shorter than the reference time. Therefore, the stop control signal is output from the motor controller 81 to the motor driver 82 before the power supply to the motor M0 is stopped by the interlock control of the motor driver 82.

As shown above, when the content of the power control signal of the control signal SC0 indicates a situation in which the load of the motor M0 is the no load, the motor controller 81 determines the first operation signal SC1 and the second operation signal SC2. Is not output, but the stop control signal is output to the motor driver 82 (steps S3 and S6).

Therefore, the unloaded motor M0 is held in the stopped state, and the image processing device 10 does not consume the electric power for holding the motor M0 in the stopped state.

Further, when the content of the power control signal of the control signal SC0 indicates a situation in which the load of the motor M0 is the low load, the motor controller 81 applies the regenerative brake by the regenerative brake circuit 83 to the motor M0 while applying the motor. The driver 82 stops the power supply to the motor M0 (steps S3, S4, S6).

Therefore, the low-load motor M0 is held in the stopped state by the regenerative brake, and the regenerative brake circuit 83 consumes almost no electric power for holding the motor M0 in the stopped state.

The power consumed by the regenerative braking circuit 83 to keep the motor M0 in the stopped state is smaller than the power consumption of the external braking device 7 in operation.

Further, when the content of the power control signal of the control signal SC0 indicates a situation in which the load of the motor M0 is the high load, the motor controller 81 applies the braking force of the external brake device 7 to the motor M0 while applying the motor. The driver 82 stops the power supply to the motor M0 (steps S3, S5, S6).

Therefore, the high-load motor M0 is held in the stopped state by the strong braking force of the external braking device 7, and the external braking device 7 consumes very little electric power to keep the motor M0 in the stopped state.

That is, the power consumption of the operating external brake device 7 is smaller than the power consumed by the operating motor M0 to output a torque balanced with the external force.

<Process S7>
In step S7, the motor controller 81 determines whether or not the rotation detection signal SD0 is maintained in a state satisfying the target condition.

Then, when the motor controller 81 determines that the state in which the rotation detection signal SD0 satisfies the target condition is maintained, the process of step S7 is repeated, and if not, the process is shifted to step S8.

<Process S8>
In step S8, the motor controller 81 outputs the direction signal of the control signal SC0 according to the direction of the position error to the motor driver 82, as in step S2.

Further, in step S8, the motor controller 81 adjusts the power control signal of the control signal SC0 according to the magnitude of the position error, and outputs the adjusted power control signal to the motor driver 82.

<Process S9>
Subsequently, the motor controller 81 outputs the drive control signal to the motor driver 82. As a result, the motor driver 82 supplies electric power corresponding to the direction signal and the electric power control signal to the motor M0.

<Process S10>
Subsequently, the motor controller 81 stops the output when the first operation signal SC1 is output to the regenerative brake circuit 83, and outputs the second operation signal SC2 to the external brake device 7. Stop the output.

After that, the motor controller 81 shifts the process to step S1. As a result, the motor controller 81 repeats the process from step S1.

As shown above, the motor controller 81 executes the motor holding control for holding the rotational position of the motor M0 constant (see FIG. 3).

In the motor holding control, the motor controller 81 is in a state where power is supplied to the motor M0 in the first holding period until the rotation detection signal SD0 satisfies the predetermined target condition before the lock condition is satisfied. The control signal SC0 corresponding to the rotation detection signal SD0 is output to the motor driver 82 (steps S1 and S2 in FIG. 3).

Further, the motor controller 81 outputs the first operation signal SC1 to the regenerative braking circuit 83 or the second to the external braking device 7 in the second holding period after the rotation detection signal SD0 satisfies the target condition. The operation signal SC2 is output (steps S4 and S5 in FIG. 3).

Further, the motor controller 81 outputs the operation signal SC1 or SC2 and outputs the stop control signal SC0, which is a control signal SC0 for stopping the power supply to the motor M0, to the motor driver 82 during the second holding period (FIG. 3). Step S6).

Therefore, if the image processing device 10 is adopted, it is possible to reduce the power consumption of the motor M0 when the control for keeping the rotational position of the motor M0 constant is executed. Further, it is possible to prevent the motor M0 whose power supply is stopped from unintentionally rotating due to an external force.

Further, the motor controller 81 selects one of the regenerative brake circuit 83 and the external brake device 7 as the output destination of the operation signal SC1 or SC2 according to the content of the power control signal in the first holding period (FIG. 3). Steps S3 to S5).

Therefore, a more suitable braking device is selected from the two viewpoints of reduction of power consumption and reliable stop of the motor M0 according to the load applied to the motor M0 during the first holding period.

Further, when the content of the power control signal in the first holding period satisfies the no-load condition, the motor controller 81 outputs the stop control signal without outputting the operation signals SC1 and SC2 (FIG. 3). Steps S3 and S6).

Further, the motor controller 81 outputs the operation signal SC1 or SC2 and the stop control signal when the content of the power control signal in the first holding period does not satisfy the no-load condition (step S3 in FIG. 3). ~ S5).

Therefore, if the load of the motor M0 is the no-load that does not require the regenerative brake circuit 83 and the external brake device 7, the rotational position of the motor M0 is maintained constant in a state of lower power consumption.

Further, the motor controller 81 outputs the drive control signal to the motor driver 82 and an operation signal to the regenerative brake circuit 83 and the external brake device 7 when the predetermined return condition is satisfied in the second holding period. The output of SC1 and SC2 is stopped (steps S7, S8, S10 in FIG. 3).

In the present embodiment, the return condition is a condition that the rotation detection signal SD0 does not maintain the state of satisfying the target condition. The drive control signal output in step S8 is an example of the control signal SC0 that restarts the power supply to the motor M0.

If the situation changes such as a change in the external force applied to the motor M0 after the power supply to the motor M0 is stopped by the processing of steps S7 to S10, the feedback control of the motor M0 based on the rotation detection signal SD0 is promptly started. can do. At that time, it is not necessary to reset the motor driver 82.

[Application example]
In the image processing apparatus 10 shown above, it is conceivable that the rotation sensor 80 includes two sensors for one motor M0. In this case, the rotation sensor 80 includes a first rotation sensor that outputs a rotation detection signal SD0 to the motor driver 82, and a second rotation sensor that outputs a rotation detection signal SD0 to the motor controller 81.

1: Image reading device 2: Image forming device 3: Sheet transfer device 4: Print processing device 4x: Image drawing device 7: External braking device 8: Control device 10: Image processing device 11: Movable support device 12: Platen cover 13: Platen glass 20: Sheet accommodating part 30: Sheet transfer path 31: Sheet transfer roller 31a: Resist roller 32: Sheet sensor 40: Laser scanning unit 41: Photoreceptor 42: Charging device 43: Developing device 44: Transfer device 46: Fixing device 80: Rotation sensor 81: Motor controller 82: Motor driver 83: Regenerative braking circuit (regenerative braking device)
91: Manuscript 92: Sheet (recording material)
110: Image sensor unit 140: Document transfer path 141: Document transfer roller 142: Document sensor 440: Intermediate transfer belt 441: Primary transfer device 442: Secondary transfer device M0: Motor M1: Document transfer motor M2: Sheet transfer motor MS0: Rotation axis SC0: Control signal SC1: First operation signal SC2: Second operation signal SD0: Rotation detection signal

Claims (4)

The motor that drives the mechanism related to image processing,
The electric power corresponding to the control signal is supplied to the motor, and the state in which the control signal and the rotation detection signal that changes according to the rotation of the motor do not change while the power is supplied to the motor continues for a predetermined reference time. When the lock condition is satisfied, the motor driver that stops the power supply to the motor and
A motor control device that outputs the control signal corresponding to the rotation detection signal to the motor driver, and
A brake device that holds the motor in a stopped state against an external force applied to the rotation shaft of the motor when an operation signal is input.
When the motor control device executes holding control for holding the rotation position of the motor at a preset target position, the rotation detection signal before the lock condition is satisfied is predetermined with respect to the target position. The control signal corresponding to the rotation detection signal is output to the motor driver in a state where power is supplied to the motor in the first holding period until the target condition is satisfied, and the rotation detection signal satisfies the target condition. In the second holding period after that, the operation signal is output to the brake device, and the stop control signal, which is the control signal for stopping the power supply to the motor, is output to the motor driver.
The brake device is
A regenerative braking device that cuts off the power supply line to the motor by inputting the operation signal and operates the motor as a generator.
An external braking device that exerts a braking force on the rotating shaft of the motor or a rotating body interlocking with the rotating shaft by inputting the operation signal is provided.
The motor control device is an image processing device that selects one of the regenerative braking device and the external braking device as an output destination of the operation signal according to the content of the control signal in the first holding period. The motor that drives the mechanism related to image processing,
The electric power corresponding to the control signal is supplied to the motor, and the state in which the control signal and the rotation detection signal that changes according to the rotation of the motor do not change while the power is supplied to the motor continues for a predetermined reference time. When the lock condition is satisfied, the motor driver that stops the power supply to the motor and
A motor control device that outputs the control signal corresponding to the rotation detection signal to the motor driver, and
A brake device that holds the motor in a stopped state against an external force applied to the rotation shaft of the motor when an operation signal is input.
The motor control device executes holding control for holding the rotation position of the motor at a preset target position.
When the motor control device executes the holding control, the motor controls the motor in a first holding period until the rotation detection signal satisfies a predetermined target condition for the target position before the lock condition is satisfied. The control signal corresponding to the rotation detection signal is output to the motor driver while power is being supplied to the motor driver.
Further, the motor control device in the first holding period in the case of executing the holding control, when no load satisfy the contents of the control signal is predetermined, the stopped without outputting the actuation signal Output the control signal,
Further, the motor control device in the first holding period in the case of executing the holding control, if the contents of the control signal does not satisfy the no-load condition, and outputs the operation signal and the stop control signal,
Further, when the motor control device executes the holding control, the motor control device outputs the operation signal to the brake device and outputs the operation signal to the motor in the second holding period after the rotation detection signal satisfies the target condition. An image processing device that outputs a stop control signal, which is the control signal for stopping power supply, to the motor driver. The motor control device outputs the control signal for restarting the power supply to the motor to the motor driver and the operation to the brake device when the predetermined return condition is satisfied in the second holding period. The image processing apparatus according to claim 1 or 2, wherein the output of a signal is stopped. The motor drives a recording material transport motor that drives a mechanism for transporting the recording material in an image forming apparatus that forms an image on the recording material, or a mechanism for transporting the document in an image reading device that reads an image from a document. The image processing apparatus according to any one of claims 1 to 3, which includes one or both of the document transport motors.

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