JP2016024249A - Image forming apparatus, and control method of image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that reduces the number of times of execution of a preliminary supply process of supplying a developer from a removable developer supply part to a developing part, while avoiding inconvenience such as unnecessary disposal of developer, so as to prevent a deterioration of the developer; and a control method of the image forming apparatus.SOLUTION: A control part 8, every time preliminary supply start conditions are established, determines whether or not a developer supply part 11 has been replaced through comparison between current identification information on a developer supply part 11 that is read by an information reading part 7 from an identification information recording medium 112 of the developer supply part 11 and past identification information based on data in a reading data recording medium, and when it is determined that the developer supply part 11 has not been replaced, limits the number of times of execution of a preliminary supply control process within a range of the predetermined one or more limited number of times.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrophotographic image forming apparatus and a control method thereof.

  In general, an electrophotographic image forming apparatus includes a developing unit and a developer supply unit. The developing unit develops the electrostatic latent image on the image carrier by supplying the developer in the developing tank to the image carrier. The general image forming apparatus further includes a developer amount sensor that detects the amount of the developer in the developing tank. The developer is a two-component developer containing toner and a carrier or a one-component developer not containing the carrier.

  The developer replenishing unit replenishes the developer from a replenishing container that contains the developer to the developing tank. The replenishment container is called a developer container. The developer replenishing section is detachably attached to the main body including the developing section.

  In the image forming apparatus, when the amount of the developer in the developing tank is insufficient, a preparation replenishment step is performed as preparation for enabling execution of image formation. The preparation replenishing step is a step of operating the developer replenishing unit and the developing unit so that the developer is not present in the developing tank or the amount of the developer is increased from a very small amount to a developable amount.

  Further, the preparation replenishment step is also an example of a step of determining whether or not the developer replenishment unit with insufficient developer remaining amount has been replaced with a new developer replenishment unit (see, for example, Patent Document 1). ).

JP 2001-305845 A

  By the way, as the number of times of execution of the preparation and replenishment step increases, the toner or carrier remaining in the developing tank deteriorates, and image formation defects due to toner or carrier deterioration are more likely to occur. Therefore, it is desirable that the number of executions of the preparation and replenishment step is as small as possible unless other inconveniences occur.

  On the other hand, when the developer supply unit has an information recording medium on which unique identification information is recorded, it is possible to determine whether or not the developer supply unit is replaced. In this case, when the amount of the developer in the developing tank is insufficient, it is conceivable that the preparation replenishment step is not executed unless the developer replenishment section is replaced. Thereby, it is possible to prevent the developer (toner or carrier) remaining in the developing tank from being deteriorated more than necessary, and to prevent an image formation defect due to the deterioration of the developer.

  However, if the preparatory replenishment step is executed only after the developer replenishment unit is replaced, the following inconvenience may occur. For example, there is a case where the amount of the developer in the developing tank is insufficient due to a state defect that can be solved even though the developer remains in the supply container. In this case, the remaining developer cannot be used up, and the developer may be wasted.

  The object of the present invention is to reduce the number of executions of the preparation replenishment step for replenishing the developer from the removable developer replenishment unit to the development unit while avoiding inconveniences such as wasteful disposal of the developer, thereby deteriorating the developer. It is an object of the present invention to provide an image forming apparatus and a control method thereof.

  An image forming apparatus according to an aspect of the present invention includes a developing unit, a developer supply unit, a developer amount sensor, a read data recording unit, a preparation supply control unit, a replacement determination unit, and a number limit control unit. With. The developing unit develops the electrostatic latent image on the image carrier by supplying the developer in the developing tank to the image carrier. The developer replenishing unit replenishes the developer from a replenishing container that contains the developer to the developing tank. The developer replenishing section has an identification information recording medium in which unique identification information is recorded in advance, and is detachably attached to the main body including the developing section. The developer amount sensor is a sensor that detects the amount of the developer in the developer tank. The information reading unit reads the identification information from the identification information recording medium of the developer supply unit. The read data recording unit stores the data of the identification information read by the information reading unit in a read data storage medium every time a predetermined storage condition is satisfied. The preparation replenishment control unit satisfies a predetermined operation end condition when a predetermined preparation replenishment start condition is satisfied including a detection result of the developer amount sensor satisfying a predetermined shortage condition. The developer replenishing section and the developing section are operated until. The replacement determination unit supplies the developer by comparing the current identification information read by the information reading unit with the past identification information based on data of the read data storage medium every time the preparation supply start condition is satisfied. The presence or absence of replacement of the part is determined. The number-of-times limiting control unit is configured to set the number of executions of the preparation replenishment control unit when the replacement determining unit determines that the developer replenishing unit has not been replaced within a predetermined number of limiting times. Limit to.

  An image forming apparatus control method according to another aspect of the present invention is a control method of an image forming apparatus including the developing unit, the developer supply unit, the developer amount sensor, and the information reading unit. . The present control method includes a read data recording process, a preparation supply control process, and a replacement determination process. The read data recording step is a step of storing in the read data storage medium the data of the identification information read by the information reading unit every time a predetermined storage condition is satisfied. The preparation replenishment control step is a step of operating the developer replenishing unit and the developing unit until a predetermined operation completion condition is satisfied when a predetermined replenishment start condition is satisfied. The preparation replenishment start condition includes that the detection result of the developer amount sensor satisfies a predetermined shortage condition. In the replacement determination step, the developer replenishment is performed by comparing the current identification information read by the information reading unit with the past identification information based on data of the read data storage medium every time the preparation replenishment start condition is satisfied. The presence / absence of replacement of parts is determined. The number of executions of the preparation replenishment control step when the determination result that the developer replenishment unit is not replaced is obtained in the replacement determination step is limited to a predetermined number of limit times or more.

  According to the present invention, while avoiding inconveniences such as wasteful disposal of the developer, the number of executions of the preparation replenishment process for replenishing the developer from the removable developer replenishment unit to the development unit is reduced, and the developer is deteriorated. It is possible to provide an image forming apparatus and a control method therefor that can prevent the above.

FIG. 1 is a configuration diagram of an image forming apparatus according to the first embodiment of the present invention. FIG. 2 is a block diagram of related devices for developer replenishment control in the image forming apparatus according to the first embodiment of the present invention. FIG. 3 is a flowchart showing an example of a developer replenishment control process in the image forming apparatus according to the first embodiment of the present invention. FIG. 4 is a flowchart showing an example of the cover opening / closing history recording process in the image forming apparatus according to the first embodiment of the present invention. FIG. 5 is a flowchart showing an example of the developer supply unit ID recording process in the image forming apparatus according to the first embodiment of the present invention. FIG. 6 is a flowchart illustrating an example of a preparation supply control process in the image forming apparatus according to the first embodiment of the present invention. FIG. 7 is a configuration diagram of an image forming apparatus according to the second embodiment of the present invention. FIG. 8 is a flowchart showing an example of the replenishment part detachment history recording process in the image forming apparatus according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the following embodiment is an example which actualized this invention, Comprising: It does not have the character which limits the technical scope of this invention.

[First Embodiment]
First, a schematic configuration of the image forming apparatus 10 according to an embodiment of the present invention will be described with reference to FIG. The image forming apparatus 10 is an electrophotographic image forming apparatus. As shown in FIG. 1, the image forming apparatus 10 includes a sheet supply unit 2, a sheet transport unit 3, an image forming unit 4, an optical scanning unit 5, a fixing unit 6, an ID reading unit 7, and a developer in a housing 100. A quantity sensor 800, a cover sensor 801, an operation display unit 80, a control unit 8, and the like are provided.

  The image forming apparatus 10 is, for example, a printer, a copier, a facsimile machine, or a multifunction machine. The multifunction machine has both the printer function and the copier function.

  The sheet supply unit 2 includes a sheet receiving unit 21 and a sheet sending unit 22. The sheet receiving portion 21 is configured to be able to stack a plurality of recording sheets 9. The recording sheet 9 is a sheet-like image forming medium such as paper, coated paper, postcard, envelope, and OHP sheet.

  The sheet feeding unit 22 rotates in contact with the recording sheet 9 to send the recording sheet 9 from the sheet receiving unit 21 toward the conveyance path 30.

  The sheet conveyance unit 3 includes a conveyance roller 31. The conveyance roller 31 conveys the recording sheet 9 supplied from the sheet supply unit 2 toward the image forming unit 4, and further, the recording sheet 9 after image formation is discharged from the discharge port of the conveyance path 30. The sheet is discharged onto the discharge tray 101.

  The image forming unit 4 forms an image on the surface of the recording sheet 9 that is supplied from the sheet feeding unit 22 and is moving along the conveyance path 30. The image forming unit 4 includes a drum-shaped photoconductor 41, a charging device 42, a developing device 43, a transfer device 45, a charge eliminating device 46, a cleaning device 47, and the like. The photoreceptor 41 is an example of an image carrier.

  The photoconductor 41 rotates and the charging device 42 charges the surface of the photoconductor 41 uniformly. Further, an electrostatic latent image is written on the surface of the photosensitive member 41 charged by scanning the laser beam with the optical scanning unit 5.

  The developing device 43 develops the electrostatic latent image on the photoreceptor 41 with a developer. Further, the transfer device 45 transfers the image (developer image) on the surface of the photoconductor 41 to the recording sheet 9 moving on the conveyance path 30. For example, the developer is a one-component developer containing toner or a two-component developer containing toner and carrier.

  Further, the neutralization device 46 neutralizes the surface of the photoconductor 41 after image transfer, and the cleaning device 47 removes the developer remaining on the photoconductor 41 surface.

  The fixing unit 6 sandwiches the recording sheet 9 on which an image is formed between a fixing roller 61 including a heater 610 such as a halogen heater and a pressure roller 62, and sends the recording sheet 9 to a subsequent process. As a result, the fixing unit 6 heats the image of the developer on the recording sheet 9 and fixes the image on the recording sheet 9.

[Details of development equipment]
The developing device 43 includes a developer supply unit 11, an intermediate hopper unit 12, and a developing unit 13.

  As shown in FIG. 1, the developing unit 13 includes a developing tank 130, a developing roller 131, and a developer conveying member 132. The developer tank 130 is a container that stores the developer supplied from the developer replenishing unit 11 through the intermediate hopper unit 12.

  The developing unit 13 develops the electrostatic latent image on the photoconductor 41 by supplying the developer in the developing tank 130 to the photoconductor 41. The developer conveying member 132 conveys the developer to the periphery of the developing roller 131 by rotating in the developing tank 130. For example, the developer conveying member 132 is a screw-type member having a rotating shaft portion and a spiral blade portion formed around the rotating shaft portion.

  When image formation is performed, the developing roller 131 supplies the developer to the surface of the photoreceptor 41 to develop the electrostatic latent image on the surface of the photoreceptor 41 with the developer. The developing roller 131 may be referred to as a developing sleeve.

  The photoconductor 41, the developing roller 131, and the developer conveying member 132 are rotationally driven by the development driving unit 14. For example, the development driving unit 14 includes a motor and a gear mechanism that transmits the rotational force of the motor to each rotating body such as the photosensitive member 41.

  The developer supply unit 11 is detachably attached to the main body (inside the casing 100) of the image forming apparatus 10 including the developing unit 13. The cover sensor 801 is a sensor that detects an open / closed state of the cover 102 that is opened when the developer supply unit 11 is removed from the main body.

  The developer supply unit 11 includes a supply container 110, a developer delivery member 111, and an ID (IDentification) recording medium 112. The replenishing container 110 is a container for storing the developer. The developer delivery member 111 rotates to deliver the developer from the supply container 110 to the intermediate hopper 12.

  The ID recording medium 112 is an information recording medium in which a replenishment unit ID that is identification information unique to each developer replenishment unit 11 is recorded in advance. The ID recording medium 112 is an example of an identification information recording medium. For example, the ID recording medium 112 may be a known RF (Radio Frequency) tag. The RF tag is an example of an information recording medium having a built-in memory in which data of the replenishment unit ID is recorded and a wireless circuit capable of transmitting the data in the built-in memory using radio waves as a communication medium.

  It should be noted that the ID recording medium 112 may be a sheet on which a barcode or QR code (registered trademark) representing the replenishment unit ID is recorded.

  The intermediate hopper unit 12 conveys the developer supplied from the developer supply unit 11 to the developing tank while stirring. In other words, the developer replenishing section 11 replenishes the developer from the replenishing container 110 to the developing tank 130 via the intermediate hopper section 12. Note that the intermediate hopper 12 may be omitted. In that case, the developer replenishing section 11 replenishes the developer directly to the developing tank 130.

  The developer delivery member 111 and the intermediate hopper 12 of the developer replenishing unit 11 are driven by a replenishment driving unit 15. For example, the replenishment drive unit 15 includes a gear mechanism that transmits a rotational force of a drive source (motor) of the development drive unit 14 to the developer delivery member 111 and the intermediate hopper unit 12, and the gear mechanism and the drive source. A clutch capable of releasing the connection.

  The developer amount sensor 800 is a sensor that detects the amount of the developer in the developer tank 130. For example, it is conceivable that the developer amount sensor 800 is a magnetic permeability sensor that detects magnetism that changes in accordance with the amount of the developer in the developer tank 130. In addition, the developer amount sensor 800 may be a piezoelectric vibration sensor that outputs a signal that changes according to the amount of the developer (powder) present in the vicinity. It is also conceivable that the developer amount sensor 800 is a transmissive optical sensor.

  The ID reading unit 7 is an example of an information reading unit that reads the supply unit ID (identification information) from the ID recording medium 112 of the developer supply unit 11. When the ID recording medium 112 is the RF tag, the ID reading unit 7 is a RFID (Radio Frequency IDentification) reader.

  When the ID recording medium 112 is a sheet on which a barcode or QR code is recorded, the ID reading unit 7 is a barcode scanner or a QR code reading camera.

  The control unit 8 controls various devices included in the image forming apparatus 10. For example, the control unit 8 controls the development driving unit 14 and the replenishment driving unit 15 according to the detection result of the developer amount sensor 800. Further, the control unit 8 causes the operation display unit 80 including, for example, a liquid crystal panel and operation buttons to display an operation menu and information indicating the state of the apparatus.

  As shown in FIG. 2, the control unit 8 includes an MPU (Micro Processor Unit) 81, a memory 82, a signal interface 83, a drive circuit 84, and the like.

  The MPU 81 is a processor that executes various arithmetic processes. The control unit 8 performs overall control of the image forming apparatus 10 by the MPU 81 executing various control programs Pr1 to Pr6 stored in advance in the memory 82.

  The memory 82 is a nonvolatile storage unit in which information such as the control programs Pr1 to Pr6 for causing the MPU 81 to execute various processes is stored in advance. Further, the memory 82 is also a storage unit that can read and write various data D1, D2 by the MPU 81. It is also conceivable that a memory for storing the control programs Pr1 to Pr6 and a memory for recording the data D1 and D2 are provided separately.

  The signal interface 83 is an interface circuit that relays signal transfer between the MPU 81 and the sensors and control target devices. The MPU 81 inputs detection signals (measurement signals) from various sensors including the developer amount sensor 800 through the signal interface 83. Further, the MPU 81 exchanges data with the operation display unit 80 via the signal interface 83.

  Further, the MPU 81 outputs a control signal to the drive circuit 84 through the signal interface 83, thereby controlling the development drive unit 14, the replenishment drive unit 15, the charging device 42, the charge removal device 46, and the like.

  In the image forming apparatus 10, a preparation supply process is performed as preparation for enabling execution of image formation. In the preparation and replenishment step, the developer replenishment section 11, the intermediate hopper section 12, and the development are performed so that the developer in the developing tank 130 is increased to a developable amount from a state where the developer does not exist or hardly exists. This is a step of operating the unit 13.

  By the way, as the number of executions of the preparation and replenishment step increases, the developer (toner or carrier) remaining in the developer tank 130 deteriorates, and image formation defects due to the deterioration of the developer easily occur. Therefore, it is desirable that the number of executions of the preparation and replenishment step is as small as possible unless other inconveniences occur.

  On the other hand, when the developer supply unit 11 has the ID recording medium 112 on which the supply unit ID, which is unique identification information, is recorded, it is possible to determine whether or not the developer supply unit 11 is replaced. .

  In order to prevent the preparation replenishment step from being performed wastefully, the preparation replenishment step is performed unless the developer replenishment section 11 is replaced when the amount of the developer in the developer tank 130 is insufficient. It is possible not to execute. Thereby, it is possible to prevent the developer (toner or carrier) remaining in the developing tank 130 from being deteriorated more than necessary, and to prevent image formation defects due to the deterioration of the developer.

  However, if the preparation replenishment step is executed only after the developer replenishment unit 11 is replaced, the following inconvenience may occur. For example, although the developer remains in the supply container 110, the amount of the developer in the developing tank 130 may be insufficient due to a state defect that can be eliminated. In this case, the remaining developer cannot be used up, and the developer may be wasted.

  For example, in the developer replenishing unit 11, the amount of the developer in the developer tank 130 may be insufficient due to a temporary transport failure of the developer due to the deviation of the developer in the replenishing container 110. is there. In this case, if the developer replenishing portion 11 is removed and shaken and then attached to the main body portion again, the conveyance failure may be solved. Thereafter, if the preparation replenishment step is executed, the shortage of developer in the developing tank 130 is resolved. However, if the preparation and replenishment step is not executed, the remaining developer cannot be used up, resulting in a disadvantage that the developer must be discarded wastefully.

  On the other hand, when the image forming apparatus 10 is employed, a developer replenishment control process described later is performed. This reduces the number of executions of the preparation replenishment step of replenishing the developer from the removable developer replenishment unit 11 to the development unit 13 while avoiding inconveniences such as wasteful disposal of the developer. Degradation of the developer can be prevented.

  The controller 8 executes the developer replenishment control process described later when a predetermined preparation replenishment start condition is satisfied. The preparation replenishment start condition includes that a detection result of the developer amount sensor 800 satisfies a predetermined shortage condition. The step of determining the preparation / replenishment start condition is realized by the MPU 81 executing the start condition determination program Pr1. The MPU 81 that executes the start condition determination program Pr1 is an example of a start condition determination unit that determines the preparation supply start condition.

  The shortage condition is that the developer amount sensor 800 detects less than a predetermined first lower limit amount. In the present embodiment, the control unit 8 sets a state in which the detection result of the developer amount sensor 800 satisfies a predetermined first shortage condition and a second shortage condition that is a smaller amount of conditions than the first shortage condition. Judgment is made by distinguishing from the state to be satisfied. In other words, when the detection result of the developer amount sensor 800 satisfies the first shortage condition or the second shortage condition, the shortage condition is satisfied.

  The first shortage condition is that the developer amount sensor 800 detects a second lower limit amount that is less than the first lower limit amount and smaller than the first lower limit amount. The control unit 8 determines that the amount of the developer is in the “Low state” when the first shortage condition is satisfied. This “Low state” is a state in which the developer (toner) remains in the developing tank 130 in a very small amount that is insufficient for image formation.

  The second shortage condition is that the developer amount sensor 800 detects less than the second lower limit amount. The control unit 8 determines that the amount of the developer is in the “Empty state” when the second shortage condition is satisfied. The “Empty state” is a state in which the developer (toner) does not remain or hardly remains in the developing tank 130.

  The control unit 8 notifies the shortage state of the developer through the operation display unit 80 when the detection result of the developer amount sensor 800 satisfies the shortage condition. At this time, the control unit 8 distinguishes between a state where the detection result of the developer amount sensor 800 satisfies the first shortage condition and a state where the second shortage condition is satisfied, and notifies the shortage state of the developer. .

  The notification of the shortage state is realized by the MPU 81 executing the notification program Pr2. The MPU 81 that executes the notification program Pr2 is an example of a notification unit that notifies the shortage state of the developer.

  For example, the preparation replenishment start condition is that a start operation or a mounting operation of the developer replenishing unit 11 is detected in a state where the shortage condition is satisfied.

  The activation operation is, for example, an operation of turning on a main power switch (not shown) or an operation of touching the operation unit of the operation display unit 80. The operation of touching the operation unit of the operation display unit 80 is an operation of shifting the control unit 8 from the sleep state (power saving state) to the activated state.

  The controller 8 determines whether or not the operation of the cover 102 has been performed by referring to the change in the detection result of the cover sensor 801. For example, when the cover sensor 801 detects a change from the open state to the closed state of the cover 102, the control unit 8 determines that the mounting operation of the developer supply unit 11 has been performed. It is also conceivable that the preparation supply start condition is a condition other than the above example.

  The controller 8 determines whether or not the operation of the cover 102 has been performed by referring to the operation history data D1 recorded in the memory 82. A specific example of the operation history data D1 will be described later.

[Developer supply control process]
Next, an example of a control method of the image forming apparatus 10 will be described with reference to FIG. FIG. 3 is a flowchart showing an example of the developer replenishment control process executed by the control unit 8. In the following description, S1, S2,... Represent processing procedure identification codes. The processing of the control unit 8 shown below is realized by the MPU 81 executing a control program stored in the memory 82.

  The controller 8 executes the developer replenishment control process shown in FIG. 3 when the preparation replenishment start condition is satisfied.

<Process S1>
When the control unit 8 determines that the preparation / replenishment start condition is satisfied, the control unit 8 causes the ID reading unit 7 to read the supply unit ID and acquires the supply unit ID.

<Process S2>
Further, the control unit 8 determines whether or not the developer supply unit 11 is replaced. The control unit 8 compares the current replenishment unit ID acquired in step S1 with the past replenishment unit ID based on the record ID data D2 recorded in the memory 82 by executing a read data recording step described later. The presence / absence of the replacement is determined.

  That is, the control unit 8 determines that there is no replacement if the current supply unit ID matches the previous supply unit ID, and otherwise determines that there is replacement. Details of the read data recording step will be described later.

  The control unit 8 executes a replacement determination step (S1, S2) for determining whether or not the developer supply unit 11 is replaced every time the preparation supply start condition is satisfied. The replacement determination step (S1, S2) is realized by the MPU 81 executing the replacement determination program Pr3. The MPU 81 that executes the replacement determination program Pr3 is an example of a replacement determination unit that determines the presence or absence of the replacement.

  When the determination result in steps S1 and S2 indicates that the developer replenishing unit 11 has not been replaced (NO in S2), the control unit 8 shifts the process to a number limiting control step (S3 to S7) described later. When the determination result in steps S1 and S2 indicates that the developer replenishing unit 11 has been replaced (YES in S2), the control unit 8 shifts the process to a preparation replenishment control step (S9) described later.

<Steps S3 to S7>
When the determination result in steps S1 and S2 indicates that the developer replenishing unit 11 has not been replaced, the control unit 8 sets the number of executions of a preparatory replenishment control step (S9), which will be described later, to one or more times. The number limiting control step (S3 to S7) for limiting the number of times within the range of the limiting number is executed.

  For example, in the number-of-times limiting control step, the control unit 8 includes a first number-of-times limiting step in which the number of times of limitation is different depending on whether the amount of the developer is “Low state” or “Empty state”. The process is selectively shifted to either (S4, S5) or the second number limiting step (S6, S7) (S3).

  In the first number limiting step when the amount of the developer is in the “Low state”, the control unit 8 counts up the first variable for counting the number of times (S4). The first variable indicates the number of times that a preparation replenishment control step (S9) to be described later is executed when the amount of the developer is in the “Low state”.

  Further, the control unit 8 determines whether or not the number of times represented by the first variable is within a predetermined first limit number of times (S5). And if the frequency | count which the said 1st variable represents is less than the said 1st frequency | count, the said control part 8 will transfer a process to the preparation supply control process (S9) mentioned later (S5).

  Similarly, in the second number limiting step when the amount of the developer is in the “Empty state”, the control unit 8 counts up a second variable for counting the number of times (S6). The second variable indicates the number of times that the preparation replenishment control step (S9) described later is executed when the amount of the developer is in the “Empty state”.

  Further, the control unit 8 determines whether or not the number of times represented by the second variable is within a predetermined second limit number (S7). And if the frequency | count which the said 2nd variable represents is less than the said 2nd frequency | count, the said control part 8 will transfer a process to the preparation supply control process (S9) mentioned later (S7).

  In addition, when the number of times represented by the second variable exceeds the second limit number, the control unit 8 does not execute the preparation replenishment control step (9) and performs a predetermined message through the operation display unit 80. Is output, and the developer replenishment control process is terminated.

  The number limiting control process (S3 to S7) is realized by the MPU 81 executing the number limiting control program Pr4. As a result, the control unit 8 determines the number of executions of the preparation supply control step (S9) when it is determined that the developer supply unit 11 is not replaced as the first limited number of times or the first number of times. 2. Limit within the limit number of times. The MPU 81 that executes the number limit control program Pr4 is an example of a number limit control unit.

  In the number limiting control step (S3 to S7), the control unit 8 (number limiting control unit) indicates the number of executions of the preparation replenishment control step (S9), and the detection result of the developer amount sensor 800 is the first. Limiting is independently performed when the shortage condition ("Low state") is satisfied (S4, S5) and when the second shortage condition ("Empty state") is satisfied (S5, S7).

  Therefore, it is possible to finely control the limit on the number of executions of the preparation replenishment control process step by step in accordance with the shortage of the developer amount in the developer tank 130.

<Step S9>
The preparation replenishment control step (S9) is a step executed by the control unit 8 when the preparation replenishment start condition is satisfied. The controller 8 terminates the developer supply control process after executing the preparation supply control process (S9).

  The preparation supply control step (S9) is realized by the MPU 81 executing the preparation supply limit control program Pr5. The preparation replenishment control step (S9) operates the developer replenishment unit 11, the intermediate hopper unit 12, and the development unit 13 until a predetermined operation end condition is satisfied when the preparation replenishment start condition is satisfied. It is a process to make. The termination condition includes that a detection result of the developer amount sensor 800 satisfies a target condition larger than the shortage condition. The control unit 8 that executes the preparation replenishment limit control program Pr5 is an example of a preparation replenishment control unit.

[Preparation supply control process]
Here, a specific example of the preparation replenishment control step (S9) executed by the control unit 8 will be described with reference to FIG. FIG. 6 is a flowchart showing an example of the preparation replenishment control process.

<Step S31>
First, the control unit 8 operates the developing drive unit 14 and the replenishment drive unit 15, and operates the charge removal device 46 and the charging device 42. As a result, the developer delivery member 111 and the intermediate hopper 12 are operated, and the developer is supplied from the replenishing container 110 to the developer tank 130 via the intermediate hopper 12. Further, the developer conveying member 132 and the developing roller 131 are operated, and the developer supplied into the developing tank 130 is conveyed around the developing roller 131 while circulating in the developing tank 130.

  Further, the control unit 8 causes the operation display unit 80 to display a message indicating that the developer is being replenished.

<Process S32>
Further, the control unit 8 monitors whether or not the detection result of the developer amount sensor 800 satisfies a predetermined target condition (S32), and monitors whether or not a predetermined stop condition is satisfied. (S33) is performed. Then, the control unit 8 operates the developer supply unit 11, the intermediate hopper unit 12, and the developing unit 13 until the detection result of the developer amount sensor 800 satisfies the target condition or the stop condition. The target condition and the stop condition are examples of the end condition that triggers the end of the preparation supply control process.

  The target condition is a condition for detecting that an amount of the developer necessary for development is supplied into the developer tank 130. For example, the target condition is that the detection value of the developer amount sensor 800 exceeds a predetermined target level.

  The stop condition is, for example, that a predetermined upper limit time Tx has elapsed during the operation of the developer supply unit 11. The control based on the stop condition is a control for preventing the preparatory supply control process from continuing excessively due to some abnormality.

<Step S34>
Then, when the target condition is satisfied, the control unit 8 stops the developing drive unit 14 and the replenishment drive unit 15 and stops the charge removal device 46 and the charging device 42. Thereby, the said preparation supply process is complete | finished. That is, the developer delivery member 111 and the intermediate hopper 12 are stopped, and the developer transport member 132 and the developing roller 131 are also stopped.

  However, when the stop condition is satisfied before the detection result of the developer amount sensor 800 satisfies the target condition (YES in S33), the control unit 8 executes a stop process (S5). By executing the stop process, the preparation supply process is completed.

  The stop process is a process of stopping the development drive unit 14, the replenishment drive unit 15, the charge removal device 46, and the charging device 42. As a result, the developer delivery member 111, the intermediate hopper 12 and the developer transport member 132 are stopped. Further, it is conceivable that the stop process includes a process of displaying a message indicating that the replenishment of the developer is stopped on the operation display unit 80.

  In the image forming apparatus 10, when the amount of the developer in the developing tank 130 is insufficient, the number of executions of the preparation replenishment step is limited unless the developer replenishment unit 11 is replaced. (S3-S7). Thereby, it is possible to prevent the developer (toner or carrier) remaining in the developing tank 130 from being deteriorated more than necessary, and to prevent image formation defects due to the deterioration of the developer.

  As described above, there is a case where the amount of the developer in the developing tank 130 is insufficient due to a state defect that can be solved even when the developer remains in the supply container 110. . Even in this case, in the image forming apparatus 10, the preparation replenishment step can be executed to such an extent that the remaining developer can be used up within the limit number of times. Therefore, the inconvenience that the developer must be wasted can be avoided.

  Therefore, if the image forming apparatus 10 is employed, the developer is replenished from the removable developer replenishing unit 11 to the developing unit 13 while avoiding inconveniences such as wasteful disposal of the developer. Deterioration of the developer can be prevented by reducing the number of executions of the preparation supply step.

[Cover opening / closing history recording process]
Next, the cover opening / closing history recording process executed by the control unit 8 will be described with reference to FIG. The cover opening / closing history recording step is a step that is executed to determine whether or not the operation of the cover 102 has been performed when the preparation / replenishment start condition is determined. FIG. 4 is a flowchart showing an example of the developer supply control process.

<Step S11>
In the cover opening / closing history recording step, first, the control unit 8 determines whether or not the detection result of the developer amount sensor 800 satisfies the shortage condition.

<Step S12>
When the detection result of the developer amount sensor 800 satisfies the shortage condition, the control unit 8 refers to the output of the cover sensor 801 to determine whether or not the cover 102 is open. To do.

<Step S13>
When the shortage condition is satisfied and the cover 102 is in the open state, the control unit 8 records cover open history data in the memory 82 and returns the process to step S11.

<Step S14>
On the other hand, when the shortage condition is satisfied and the cover 102 is in the closed state, the control unit 8 determines whether or not the cover opening history data is recorded in the memory 82. When the cover opening history data is not recorded, the control unit 8 returns the process to step S11.

<Step S15>
When the cover opening history data is recorded, the control unit 8 records the cover opening / closing history data in the memory 82, and returns the process to step S11. The cover open / close history data is data indicating that an operation for closing the cover 102 after the cover 102 is opened under the condition where the shortage condition is satisfied.

<Step S16>
On the other hand, if the detection result of the developer amount sensor 800 does not satisfy the shortage condition in step S11, the control unit 8 erases the cover opening history data and the cover opening / closing history data in the memory 82. Then, the process returns to step S11.

  The control unit 8 determines whether or not the cover opening / closing history data is recorded in the memory 82 when determining the preparation supply start condition, whereby the detection result history of the cover sensor 801 is recorded. Determines whether or not an operation for closing the cover 102 has been performed. The cover opening data and the cover opening / closing history data are examples of the operation history data D1 recorded in the memory 82.

  In the above-described example, the preparatory supply start condition is that the cover sensor 801 indicates that the cover sensor 801 is closed after the cover 102 is opened after the detection result of the developer amount sensor 800 satisfies the shortage condition. Includes detected. In this case, it is possible to prevent the preparation replenishment control step (S9) from being performed in vain with the developer replenishment portion 11 having a shortage of developer mounted as it is. The operation history data D1 represents a history of detection results of the cover sensor 801.

[Reading data recording process]
Next, the read data recording process executed by the control unit 8 will be described with reference to FIG. The read data recording step is a step of recording the recording ID data D2 referred to in the replacement determination step (S1, S2) in the memory 82.

  The read data recording step is a step of recording, in the memory 82, data of the replenishment unit ID (identification information) read by the ID reading unit 7 every time a predetermined storage condition is satisfied. The read data recording step is realized by the control unit 8 executing the read data recording program Pr6. The control unit 8 that executes the read data recording program Pr6 is an example of a read data recording unit that records the recording ID data D2 in the memory 82. The memory 82 is an example of a read data storage medium.

<Step S21>
In the read data recording step, first, the control unit 8 determines whether or not the detection result of the developer amount sensor 800 satisfies the shortage condition.

<Step S22>
When the detection result of the developer amount sensor 800 satisfies the shortage condition, the control unit 8 determines whether or not an ID update flag that is a control variable is in an OFF state. The ID update flag indicates whether or not the recording ID data D2 has been recorded in the memory 82 after the detection result of the developer amount sensor 800 has changed from a state that does not satisfy the shortage condition to a state that satisfies the shortage condition. Note that the initial value of the ID update flag is OFF.

  On the other hand, when the ID update flag is in the ON state, the control unit 8 shifts the process to step S21 without recording (updating) the recording ID data D2.

<Step S23>
When the shortage condition is satisfied and the ID update flag is in the OFF state, the control unit 8 causes the ID reading unit 7 to read the supply unit ID and obtain the supply unit ID. To do. Further, the control unit 8 records the recording ID data D2 indicating the acquired supply unit ID in the memory 82.

  If the recording ID data D2 has already been recorded, the recording ID data D2 is updated. Further, the control unit 8 turns on the state of the ID update flag. Then, the said control part 8 makes a process transfer to process S21.

<Step S23>
On the other hand, when the detection result of the developer amount sensor 800 does not satisfy the shortage condition in step S21, the control unit 8 turns off the ID update flag and returns the process to step S11.

  In the example shown in FIG. 5, the storage condition is that the detection result of the developer amount sensor 800 has changed from a state where the shortage condition is not satisfied to a state where the shortage condition is satisfied. It is conceivable that the storage condition further includes other conditions. When the storage condition is satisfied, the control unit 8 records (updates) the record ID data D2. As described above, the change as to whether or not the shortage condition is satisfied is included in the storage condition, thereby obtaining the following effects.

  For example, the original developer replenishment unit 11 is mounted again after the developer replenishment unit 11 with insufficient developer is replaced with a new developer replenishment unit 11 in a state where the shortage condition is satisfied. It is thought that it is done. Even in such a case, according to the present embodiment, the number-of-times limiting control step (S3 to S7) is appropriately executed in a state where the original developer replenishing unit 11 is mounted again.

[Second Embodiment]
Next, an image forming apparatus 10A according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a configuration diagram of the image forming apparatus 10A. FIG. 8 is a flowchart showing an example of the replenishment part detachment history recording process in the image forming apparatus 10A. In FIG. 7, the same components as those shown in FIG. 1 are given the same reference numerals. Hereinafter, differences of the image forming apparatus 10A from the image forming apparatus 10 will be described.

  The image forming apparatus 10A has a configuration in which a replenishment unit sensor 802 is added as compared with the image forming apparatus 10A shown in FIG. The supply unit sensor 802 is a sensor that detects whether or not the developer supply unit 11 is attached to the main body (the housing 100).

  In the image forming apparatus 10A, the preparation replenishment start condition is that the activation operation or the mounting operation of the developer replenishing unit 11 is detected in a state where the shortage condition is satisfied. In the image forming apparatus 10A, the control unit 8 detects that the replenishing unit sensor 802 detects a change from the non-mounted state of the developer supplying unit 11 to the mounted state, and the cover open / close sensor is in a closed state of the cover. Is detected, it is determined that the developer replenishment unit 11 has been mounted.

  The history of the detachment operation of the developer supply unit 11 is recorded in the memory 82 as a part of the operation history data D1. The control unit 8 refers to the operation history data D1 recorded in the memory 82 to determine whether or not the developer replenishment unit 11 has been attached or detached.

[Replenishment part desorption history recording process]
Next, the replenishment part detachment history recording process executed by the control part 8 will be described with reference to FIG. The replenishment part detachment history recording process is a process executed to determine whether or not the developer replenishment part 11 has been removed and attached when the preparation replenishment start condition is determined.

<Step S41>
In the replenishment part detachment history recording step, first, the control part 8 determines whether or not the detection result of the developer amount sensor 800 satisfies the shortage condition.

<Step S42>
When the detection result of the developer amount sensor 800 satisfies the shortage condition, the control unit 8 refers to the output of the replenishing unit sensor 802 so that the developer replenishing unit 11 is not attached (detached). Is determined).

<Step S43>
When the shortage condition is satisfied and the developer replenishment unit 11 is not attached, the control unit 8 records replenishment unit removal history data in the memory 82 and returns the process to step S41. .

<Step S44>
On the other hand, when the shortage condition is satisfied and the developer replenishment unit 11 is not attached, the control unit 8 determines whether or not the replenishment unit removal history data is recorded in the memory 82. Determine. If the replenishment section removal history data is not recorded, the control section 8 returns the process to step S41.

<Step S45>
When the replenishment part removal history data is recorded, the control unit 8 records the replenishment part removal / attachment history data in the memory 82, and returns the process to step S41. The replenishment part removal / attachment history data is data indicating that an operation of attaching the developer replenishment part 11 after being removed from the main body part is performed under the condition where the shortage condition is satisfied.

<Step S46>
On the other hand, when the detection result of the developer amount sensor 800 does not satisfy the shortage condition in step S41, the control unit 8 displays the replenishment part removal history data and the replenishment part removal / attachment history data in the memory 82. Erase and return the process to step S41.

  The control unit 8 determines whether or not the replenishment unit removal / attachment history data is recorded in the memory 82 when the preparation replenishment start condition is determined, so that the detection result of the replenishment unit sensor 802 is detected. It is determined whether or not this history indicates that an operation for attaching the developer supply section 11 after it has been removed has been performed. The replenishment part removal history data and the replenishment part removal / attachment history data are examples of the operation history data D1 recorded in the memory 82.

  In the present embodiment, the preparation replenishment start condition is that, after the detection result of the developer amount sensor 800 satisfies the shortage condition, an operation of attaching after removing the developer replenishing unit 11 is performed. This includes that detected by the replenishment unit sensor 802. In this case, it is possible to prevent the preparation replenishment control step (S9) from being performed in vain with the developer replenishment portion 11 having a shortage of developer mounted as it is. The operation history data D1 represents a history of detection results of the replenishment unit sensor 802.

[Application example]
It is conceivable that the developing device 43 does not include the intermediate hopper 12. In this case, the developer is replenished directly from the replenishing container 110 of the developer replenishing unit 11 to the developing tank 130 of the developing unit 13.

  Further, in the image forming apparatuses 10 and 10A, the preparation replenishment when the control unit 8 determines that the developer replenishment unit 11 has been replaced in the replacement determination step (S1 and S2) (YES in S2). It is also conceivable to limit the number of executions of the control step (S9). In this case, the control unit 8 has a range of times greater than the limit number of times when the number of executions of the preparation replenishment control step (S9) is determined to be no replacement of the developer replenishment unit 11 (NO in S2). Restrict to within. This control is realized by the control unit 8 executing the number limit control program Pr4.

  Even when the control unit 8 determines that the developer supply unit 11 has been replaced, the preparation supply control step (S9) is repeated uselessly by limiting the number of executions of the preparation supply control step (S9). Can be prevented.

  The developing device, the image forming apparatus, and the control method thereof according to the present invention can be freely combined within the scope of the invention described in each claim, or the embodiments and application examples described above can be freely combined. It is also possible to configure the application example by appropriately modifying or omitting a part thereof.

2: Sheet feeding unit 3: Sheet conveying unit 4: Image forming unit 5: Optical scanning unit 6: Fixing unit 7: ID reading unit (information reading unit)
8: Control unit 9: Recording sheet 10, 10A: Image forming apparatus 11: Developer replenishing unit 12: Intermediate hopper unit 13: Developing unit 21: Sheet receiving unit 22: Sheet feeding unit 30: Conveying path 31: Conveying roller 41: Photoconductor (image carrier)
42: Charging device 43: Developing device 45: Transfer device 46: Static eliminating device 47: Cleaning device 61: Fixing roller 62: Pressure roller 80: Operation display unit 81: MPU
82: Memory 83: Signal interface 84: Drive circuit 100: Housing 101: Discharge tray 102: Cover 110: Supply container 111: Developer delivery member 112: ID recording medium (identification information recording medium)
130: Developing tank 131: Developing roller 132: Developer conveying member 610: Heater 800: Developer amount sensor 801: Cover sensor 802: Supply unit sensor D1: Operation history data D2: Recording ID data (data of the read data storage medium)
Pr1: Start condition determination program Pr2: Notification program Pr3: Replacement determination program Pr4: Number limit control program Pr5: Preparation replenishment limit control program Pr6: Reading data recording program

Claims (7)

A developing unit for developing the electrostatic latent image of the image carrier by supplying the developer in the developing tank to the image carrier;
It has an identification information recording medium in which unique identification information is recorded in advance, and is detachably attached to a main body including the developing unit, and the developer is supplied from a supply container containing the developer to the developing tank. A developer replenishment section to replenish;
A developer amount sensor for detecting the amount of the developer in the developer tank;
An information reading unit that reads the identification information from the identification information recording medium of the developer supply unit;
A read data recording unit that stores data of the identification information read by the information reading unit in a read data storage medium each time a predetermined storage condition is satisfied;
The developer replenishing unit until a predetermined operation end condition is satisfied when a predetermined replenishment start condition is satisfied, including that a detection result of the developer amount sensor satisfies a predetermined shortage condition; A preparation supply control unit for operating the developing unit;
Whether the developer replenishment unit is replaced or not is determined by comparing the current identification information read by the information reading unit with the past identification information based on data of the read data storage medium every time the preparation replenishment start condition is satisfied. An exchange determination unit to perform,
The number limiting control unit that limits the number of executions of the preparation replenishment control unit when the replacement determining unit determines that the developer replenishing unit is not replaced within a range of a predetermined number of limiting times or more. An image forming apparatus.   The image forming apparatus according to claim 1, wherein the storage condition includes a change in a detection result of the developer amount sensor from a state that does not satisfy the shortage condition to a state that satisfies the shortage condition. A cover sensor that detects a state of opening and closing of a cover that is opened when the developer replenishing section is removed from the main body;
The preparation replenishment start condition includes that the cover sensor detects that the operation of closing the cover after opening the cover after the detection result of the developer amount sensor satisfies the shortage condition; The image forming apparatus according to claim 1. A replenishment part sensor for detecting whether or not the developer replenishment part is mounted on the main body part;
The replenishment start sensor detects that the replenishment sensor detects that the developer replenishment section is mounted after the developer replenishment section is removed after the detection result of the developer amount sensor satisfies the shortage condition. The image forming apparatus according to claim 1, further comprising:
  The number-of-times limiting control unit indicates the number of times the preparation supply control unit performs control when the replacement determination unit determines that the developer supply unit is replaced, and the replacement determination unit does not replace the developer supply unit. 5. The image forming apparatus according to claim 1, wherein the image forming apparatus is limited within a range of the number of times that is greater than the number of times of limitation when it is determined. When the detection result of the developer amount sensor satisfies the shortage condition, the detection result of the developer amount sensor is in a state where a predetermined first shortage condition is satisfied and a condition smaller than the first shortage condition. Further comprising a notifying unit for notifying the developer shortage state by distinguishing from a state satisfying the second shortage condition,
The number-of-times restriction control unit independently determines the number of times the control of the preparation replenishment control unit is performed when the detection result of the developer amount sensor satisfies the first shortage condition and when the second shortage condition is satisfied. The image forming apparatus according to claim 1, wherein the image forming apparatus is limited. A developing unit for developing the electrostatic latent image of the image carrier by supplying the developer in the developing tank to the image carrier;
It has an identification information recording medium in which unique identification information is recorded in advance, and is detachably attached to a main body including the developing unit, and the developer is supplied from a supply container containing the developer to the developing tank. A developer replenishment section to replenish;
A developer amount sensor for detecting the amount of the developer in the developer tank;
An information reading unit that reads the identification information from the identification information recording medium of the developer replenishing unit;
A read data recording step of storing in the read data storage medium the data of the identification information read by the information reading unit each time a predetermined storage condition is satisfied;
The developer replenishing unit until a predetermined operation end condition is satisfied when a predetermined replenishment start condition is satisfied, including that a detection result of the developer amount sensor satisfies a predetermined shortage condition; A preparation replenishment control step of operating the developing unit;
Whether the developer replenishment unit is replaced or not is determined by comparing the current identification information read by the information reading unit with the past identification information based on data of the read data storage medium every time the preparation replenishment start condition is satisfied. An exchange determination step to perform,
The number of executions of the preparatory replenishment control step when a determination result indicating that the developer replenishment unit is not replaced is obtained in the replacement determination step is limited within a predetermined number of limit times; A method for controlling an image forming apparatus.

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