Image forming device and control method thereof

Abstract

The present application provides an image forming device and a control method thereof. The image forming device includes an image bearing member, a charging member, a developing member, a charging voltage applying unit, a developing voltage applying unit, a driving unit, and a control unit. The charging voltage applying unit applies a charging voltage to the charging member, the developing voltage applying unit applies a developing voltage to the developing member, and the driving unit rotates the image bearing member, the charging member, and the developing member. The control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit, and controls the timing of the driving unit's operation, based on the current state of the image forming device, to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position. This avoids the problem of unnecessary carrier consumption and the resulting developed image contaminating the actual image after a paper jam occurs in the image forming device.

Description

Technical field

[0001] The present application relates to the field of image forming, and more particularly to an image forming device and a control method thereof that performs processing when resuming a normal imaging process after a paper jam occurs. [Background Technology]

[0002] The image recording method used in image forming devices corresponds to an electrostatic imaging process. In this process, a charging section in the image forming device charges an image bearing member, uniformly charging the surface of the image bearing member. An exposure section then illuminates the surface of the image bearing member to form an electrostatic latent image. In a developing section, a carrier in a developer (comprising a toner and a carrier) transports the toner onto the electrostatic latent image, and a developing voltage is applied to form a developed image. The developed image is then overlaid on paper, and the developed image is transferred to the paper using electrostatic forces. A fixing process forms a recorded image. However, during this imaging process, due to certain reasons, a paper jam may occur. In this case, the application of the charging and developing voltages is stopped, resulting in a residual surface potential on the surface of the image bearing member between the charging and developing sections. After the paper jam is resolved and normal imaging is resumed, the image forming device resumes the previous imaging process. This causes the carrier to develop the electrostatic latent image in the area of ​​the image bearing member with the residual surface potential, resulting in unnecessary carrier consumption, an imbalance in developer concentration, and contamination of the image. [Summary of the invention]

[0003] The embodiment of the present application provides an image forming device and a control method thereof, which can solve the problem that when the image forming device returns to normal imaging processing after a paper jam occurs, the carrier is unnecessarily consumed and the image is contaminated when the developed image is formed.

[0004] In one aspect, an embodiment of the present application provides an image forming device, comprising:

[0005] an image bearing member configured to rotate;

[0006] a charging member configured to charge a surface of the image bearing member by coming into contact with the image bearing member;

[0007] a developing member located in a rotational direction of the image bearing member and downstream of the charging member in the rotational direction, the developing member being configured to supply a developer to the image bearing member;

[0008] a charging voltage applying unit configured to apply a charging voltage to the charging member;

[0009] a developing voltage applying unit configured to apply a developing voltage to the developing member;

[0010] a driving unit configured to drive the image bearing member, the charging member, and the developing member to rotate;

[0011] The image forming apparatus further includes a control unit configured to control a timing for supplying power to the charging voltage applying unit and the developing voltage applying unit, and to control a timing for operating the driving unit to eliminate electric charges in areas of the image bearing member corresponding to the charging member position and the developing member position, according to a current state of the image forming apparatus.

[0012] In one embodiment, the control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit, and controls the timing of operating the driving unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position, according to the current state of the image forming apparatus, including:

[0013] When the image forming apparatus is in a paper jam state, the control unit controls the supply of power to the developing voltage applying unit, controls the stop of the supply of power to the charging voltage applying unit, and controls the driving unit to operate to eliminate the charge of the area corresponding to the charging member position and the developing member position on the image bearing member.

[0014] In one embodiment, the control unit controls the supply of power to the development voltage applying unit, specifically comprising: the control unit controls the supply of power to the development voltage applying unit, and stops the power supply after a first predetermined time has passed; and

[0015] Controlling the driving unit to operate specifically includes: controlling the driving unit to operate, and stopping the operation of the driving unit after a second predetermined time has passed.

[0016] In one embodiment, the control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit, and controls the timing of operating the driving unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position, based on the current state of the image forming apparatus, further comprising:

[0017] When the image forming apparatus recovers from a paper jam state to a normal state, the control unit controls the supply of power to the developing voltage applying unit, and after a third predetermined time has passed since the power was supplied to the developing voltage applying unit, supplies power to the charging voltage applying unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position area.

[0018] In one embodiment, the control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit, and controls the timing of operating the driving unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position, based on the current state of the image forming apparatus, further comprising:

[0019] When the image forming apparatus recovers from a paper jam state to a normal state, the control unit controls the driving unit to run in a direction opposite to the running direction before the paper jam occurs in the image forming apparatus, and after the driving unit runs for a fourth predetermined time, controls the supply of power to the charging voltage applying unit to eliminate the charge of the area corresponding to the charging member position and the developing member position on the image bearing member.

[0020] In one embodiment, the first predetermined time and the second predetermined time are the time required for the surface of the image bearing member to rotate from a position corresponding to the position where the charging member is located to a position corresponding to the position where the developing member is located; or

[0021] The first predetermined application and the second predetermined time are longer than the time required for the image bearing member, the charging member, and the developing member to stop rotating when a paper jam occurs in the image forming apparatus, and are shorter than the time corresponding to the time difference between when the charging voltage applying unit and the developing voltage applying unit start supplying power.

[0022] In one embodiment, the third predetermined time is the time required for the image bearing member to rotate from the position corresponding to the charging member to the position corresponding to the developing member, or the third predetermined time is the time corresponding to the time difference between the start time of the charging voltage applying unit supplying voltage to the charging member and the start time of the developing voltage applying unit supplying voltage to the developing member.

[0023] In one embodiment, the fourth predetermined time is the time required for the image bearing member to rotate from the position corresponding to the developing member to the position corresponding to the charging member, or the fourth predetermined time is the time corresponding to the time difference between the start time of the charging voltage applying unit supplying voltage to the charging member and the start time of the developing voltage applying unit supplying voltage to the developing member.

[0024] On the other hand, an embodiment of the present application further provides a control method for an image forming apparatus, the image forming apparatus comprising an image bearing member, a charging member, a charging voltage applying unit, a developing member, a developing voltage applying unit, and a driving unit; wherein the charging member is configured to charge a surface of the image bearing member by contacting the image bearing member; the developing member is located in a rotational direction of the image bearing member and downstream of the charging member in the rotational direction, and is configured to supply a developer to the image bearing member; the charging voltage applying unit is configured to apply a charging voltage to the charging member; the developing voltage applying unit is configured to apply a developing voltage to the developing member; the driving unit is configured to drive the image bearing member, the charging member, and the developing member to rotate; the method comprising:

[0025] According to the current state of the image forming apparatus, the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and the timing of operating the driving unit are controlled to eliminate the charge of the areas corresponding to the charging member position and the developing member position on the image bearing member.

[0026] In one embodiment, the controlling of the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and the controlling of the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus comprises:

[0027] When the image forming apparatus is in a jam state, power is supplied to the developing voltage applying unit by controlling the power supply, and after a first predetermined time has passed, the power supply is stopped; power is supplied to the charging voltage applying unit by controlling the power supply is stopped; and the driving unit is controlled to operate, and after a second predetermined time has passed, the driving unit is stopped to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position area.

[0028] In one embodiment, the controlling of the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and the controlling of the timing of operating the driving unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus further comprises:

[0029] When the image forming apparatus recovers from a paper jam state to a normal state, power is controlled to be supplied to the developing voltage applying unit, and after a third predetermined time has passed since power was supplied to the developing voltage applying unit, power is supplied to the charging voltage applying unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position area.

[0030] In one embodiment, the controlling of the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and the controlling of the timing of operating the driving unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus further comprises:

[0031] When the image forming apparatus recovers from a paper jam state to a normal state, the driving unit is controlled to run in a direction opposite to the running direction of the image forming apparatus before the paper jam occurs, and after the driving unit runs for a fourth predetermined time, the driving unit is controlled to run in a direction identical to the running direction of the image forming apparatus before the paper jam occurs, and power is controlled to be supplied to the charging voltage applying unit to eliminate the charge of the area on the image bearing member corresponding to the position of the charging member and the position of the developing member.

[0032] On the other hand, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements the method described in the second aspect above when the program is executed.

[0033] The embodiments of the present application control the time of supplying power to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming device, and control the time of operation of the driving unit, thereby eliminating the charge in the corresponding charging component position and developing component position areas on the image bearing component, thereby preventing the image forming device from being unnecessarily consumed and the image from being contaminated due to the formation of a developed image when it returns to a normal state after a paper jam occurs.

Brief Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 An example of a partial structure of an imaging component of an image forming device provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the charging voltage, developing voltage, and motor control timing of the image forming device provided in an embodiment of the present application;

[0037] Figure 3 An exemplary diagram of some modules of an image forming device provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of the timing of controlling a motor, charging voltage, and developing voltage provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of the timing of controlling a motor, charging voltage, and developing voltage provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of the timing of controlling a motor, charging voltage, and developing voltage provided in an embodiment of the present application;

[0041] Figure 7 A schematic diagram of the timing of controlling a motor, charging voltage, and developing voltage provided in an embodiment of the present application;

[0042] Figure 8 A drive control schematic diagram provided in an embodiment of the present application. [Specific implementation method]

[0043] In order to better understand the technical solution of the present application, the embodiments of the present application will be described in more detail below in conjunction with the relevant drawings.

[0044] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0046] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0047] In the embodiment of the present application, the image forming device is a device having at least one function related to image formation, and the above-mentioned image forming-related functions may include but are not limited to: printing function, scanning function, copying function, and fax function. For example:

[0048] Single-function printer: An image forming device with only printing function.

[0049] Multifunction printer: An image forming device with printing, copying, scanning and / or faxing capabilities, and optionally with a set number of paper trays.

[0050] Digital MFP: Based on the copy function, it has standard or optional printing, scanning, and fax functions. It uses digital principles and outputs documents in the form of laser printing. Images and text can be edited as needed. It has a large-capacity paper tray, high memory, large hard disk, powerful network support, and multi-tasking parallel processing capabilities.

[0051] Please refer to Figure 1 , an embodiment of the present application provides an example of a partial structure of an imaging component in an image forming device. Figure 1 In the embodiment of the present invention, the structure of the imaging component in the image forming device includes:

[0052] The image bearing member is a photosensitive drum 10, a charging unit 11, an exposure unit 12, a developing unit 13, a transfer unit 14, a fixing unit (not shown), a de-electrification unit 15, and a cleaning unit 16. The charging unit 11 includes a charging member, such as a charging roller, which charges the surface of the photosensitive drum 10 by contacting the photosensitive drum 10. The developing unit 13 includes a developing member, such as a developing roller, and a powder hopper, the roller surface of the developing roller contacts the developer in the powder hopper and supplies the developer to the photosensitive drum during rotation. The developing unit 13 is located in the rotation direction of the image bearing member 10 and is located downstream of the charging unit 11 in the rotation direction. Furthermore, the developing member is located in the rotation direction of the photosensitive drum and is located downstream of the charging member in the rotation direction. For example, when the photosensitive drum rotates in the clockwise direction, the position of the developing member is located downstream of the position of the charging member corresponding to the clockwise rotation direction of the photosensitive drum. During the imaging process of an image forming device, a charging voltage application unit (not shown) applies a charging voltage to the charging roller, charging the photosensitive drum 10. An exposure unit 12 exposes the photosensitive drum 10 to form an electrostatic latent image based on the image data to be printed. The electrostatic latent image is then developed by the developing unit 13 to form a developed image on the surface of the photosensitive drum 10. The developed image is then transferred to paper by a transfer unit, which can be a single transfer unit or a combination of a primary transfer unit and a secondary transfer unit. Finally, a fixing unit permanently retains the image on the paper through high-temperature and high-pressure treatment. Furthermore, a de-charge unit, such as a de-charge lamp 15, removes any charge remaining on the photosensitive drum 10 after transfer. A cleaning unit 16 cleans any remaining developer on the photosensitive drum 10 that has not been transferred. The developer is divided into a charged toner and a charged carrier, with the toner and carrier having opposite charges. For the sake of illustration, the charged toner is assumed to be positively charged, and the charged carrier is assumed to be negatively charged. During the development process of the image forming device, voltages are applied to the charging roller and the developing roller respectively through the charging voltage applying unit and the developing voltage applying unit. When the photosensitive drum obtains the charged charge from the charging roller and rotates to the developing unit, a voltage drop is formed between the developing roller and the photosensitive drum. When the voltage drop meets the voltage drop required for normal development conditions, the positively charged colorant is transported by the negatively charged carrier, so that the positively charged colorant on the surface of the developing roller is adsorbed onto the electrostatic latent image on the surface of the photosensitive drum, thereby forming a developed image.However, when a paper jam occurs in an image forming device, power to the photosensitive drum, charging roller, and developing roller is stopped. Consequently, residual charge from the charging roller may remain in the region S between the charging roller position S1 and the developing roller position S2 on the photosensitive drum surface. This residual charge, when the power supply to the charging voltage application unit is disconnected during a paper jam, causes the voltage of this residual charge to decrease. Upon recovery from the jam, this residual charge will first reach the developing roller position S2, but the developing roller has not yet been supplied with voltage. Consequently, the voltage drop between the developing roller and the photosensitive drum may not fall within the voltage drop range under normal developing conditions. This can result in, for example, the electric field force generated by the charge between the developing roller and the photosensitive drum being significantly greater than the magnetic field force. This can cause charged carriers to be attracted to the photosensitive drum, forming a developed image. This can lead to unnecessary carrier consumption, and the developed image formed by the carriers can contaminate the desired image. It should be noted that the carriers in an image forming device have a limited number of carriers within their lifespan. Therefore, minimizing carrier consumption is essential to ensure the longevity of the image forming device.

[0053] Please refer to Figure 2 , is a schematic diagram of the charging voltage, developing voltage, and motor control timing of an image forming device provided in an embodiment of the present application. Figure 2 During the normal imaging process of the image forming device, the image forming device control unit first activates the drive, such as starting the motor to rotate, and applies power to the charging voltage application unit, starting to supply power to the charging roller. The charging roller then contacts the photosensitive drum to form a charged portion, charging the photosensitive drum surface. After a predetermined time T1 has passed, the developing voltage application unit is controlled to supply power to the developing roller. When the image forming device recovers from a paper jam and returns to normal, the area between the charging roller and the developing roller on the photosensitive drum surface corresponding to the area between the charging roller and the developing roller will retain a charge from the charging roller. Because the development roller voltage is applied after the predetermined time T1 of the charging voltage and motor activation, the area between the charging roller and the developing roller on the photosensitive drum surface that passes the developing roller first, and because the developing roller has not yet been supplied with power, the electric field causes the developing carrier to be attracted to this area before the developing roller is supplied with power, forming an image. This consumes the developing carrier, and the developed image formed by the developing carrier can cause contamination of the actual image.

[0054] Therefore, to solve the above problems, please refer to Figure 3 , is a partial structural example diagram of an image forming device provided in an embodiment of the present application, such as Figure 3As shown, the image forming apparatus 300 includes an image bearing member 301 , a charging member 302 , a developing member 303 , a charging voltage applying unit 304 , a developing voltage applying unit 305 , a driving unit 306 , and a control unit 307 . Among them, the image bearing member 301 is configured to rotate; the charging member 302 is configured to charge the surface of the image bearing member 301 by contacting the image bearing member 301; the developing member 303 is located in the rotation direction of the image bearing member 301 and downstream of the charging member 302 along the rotation direction, and is configured to supply developer to the image bearing member 301; the charging voltage applying unit 304 is configured to apply a charging voltage to the charging member 301; the developing voltage applying unit 305 is configured to apply a developing voltage to the developing member 303; the driving unit 306 is configured to drive the image bearing member 301, the charging member 302 and the developing member 303 to rotate; the control unit 307 is configured to control the time of supplying power to the charging voltage applying unit 304 and the developing voltage applying unit 305 according to the current state of the image forming device 300, and control the time of running of the driving unit 306 to eliminate the charge of the area corresponding to the charging member position and the developing member position on the image bearing member.

[0055] In one embodiment, the control unit 307 controls the time of supplying power to the charging voltage applying unit 304 and the developing voltage applying unit 305, and controls the time of running the driving unit 306 to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position area according to the current state of the image forming device 300, including: when the image forming device 300 is in a paper jam state, the control unit 307 controls the supply of power to the developing voltage applying unit 304, controls the stop of supplying power to the charging voltage applying unit 305, and controls the driving unit 306 to run to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position area.

[0056] Specifically, the control unit 307 controls the supply of power to the developing voltage applying unit 304, and stops the power supply after a first predetermined time. The control unit 307 controls the operation of the driving unit 306, and specifically controls the operation of the driving unit, and stops the operation after a second predetermined time. In one embodiment, the control unit 307 controls the time of supplying power to the charging voltage applying unit 304 and the developing voltage applying unit 305 according to the current state of the image forming device 300, and controls the time of operating the driving unit 306. The control unit also includes: when the image forming device 300 returns to a normal state from a paper jam state, the control unit controls the supply of power to the developing voltage applying unit 305, and supplies power to the charging voltage applying unit 304 after a third predetermined time has passed since the power was supplied to the developing voltage applying unit 305.

[0057] In one embodiment, the control unit 307 controls the time for supplying power to the charging voltage applying unit 304 and the developing voltage applying unit 305 according to the current state of the image forming device 300, and controls the time for the driving unit 306 to run to eliminate the charge in the area corresponding to the charging component position and the developing component position on the image bearing member. The control unit 307 also includes: when the image forming device 300 recovers from a paper jam state to a normal state, the control unit 307 controls the driving unit 306 to run in a direction opposite to the running direction of the image forming device 300 before the paper jam occurs, and after the driving unit 306 runs for a fourth predetermined time, controls the supply of power to the charging voltage applying unit 304 to eliminate the charge in the area corresponding to the charging component position and the developing component position on the image bearing member.

[0058] like Figure 1 As shown, the image bearing member, such as the photosensitive drum 10, in the image forming apparatus 300 rotates in the clockwise direction. That is, before a paper jam occurs in the image forming apparatus 300, the control unit 307 controls the driving unit 306 to operate, thereby driving the image bearing member 301 to rotate in the clockwise direction. For example, the control unit 307 controls the driving unit 306 to operate in the clockwise direction, thereby driving the image bearing member 301 to rotate in the clockwise direction. When the image forming apparatus 300 recovers from the jammed state after a paper jam occurs, the control unit 307 controls the driving unit 306 to operate, thereby driving the image bearing member 301 to rotate in the counterclockwise direction. For example, the control unit 307 controls the driving unit 306 to operate in the counterclockwise direction, thereby driving the image bearing member 301 to rotate in the counterclockwise direction.

[0059] In one embodiment, the first predetermined time and the second predetermined time described above are the time required for the surface of the image bearing member 301 to rotate from the position corresponding to the charging member 302 to the position corresponding to the developing member 303; or, the first predetermined time and the second predetermined time described above are the time required for the image bearing member 301, the charging member 302 and the developing member 303 to stop rotating when a paper jam occurs in the image forming device 300, and do not exceed the time corresponding to the time difference between the charging voltage applying unit 304 and the developing voltage applying unit 305 when the two start to supply power.

[0060] In one embodiment, the third predetermined time is the time required for the image bearing member 301 to rotate from the position corresponding to the position of the charging member 302 to the position corresponding to the developing member 303, or the third predetermined time is the time corresponding to the time difference between the time when the charging voltage applying unit 304 starts supplying voltage to the charging member 302 and the time when the developing voltage applying unit 305 starts supplying voltage to the developing member 303. In one embodiment, the fourth predetermined time is the time required for the image bearing member 301 to rotate from the position corresponding to the developing member 303 to the position corresponding to the charging member 302, or the fourth predetermined time is the time corresponding to the time difference between the time when the charging voltage applying unit 304 starts supplying voltage to the charging member 301 and the time when the developing voltage applying unit 305 starts supplying voltage to the developing member 303.

[0061] In one implementation, the above-mentioned first predetermined time, second predetermined time, third predetermined time, and fourth predetermined time may be the same or different. Exemplarily, the above-mentioned first predetermined time, second predetermined time, third predetermined time, and fourth predetermined time may also be the time T1 that is delayed compared to the charging voltage and motor start time with respect to the development voltage start time. In addition, it should be noted that the above-mentioned first predetermined time, second predetermined time, third predetermined time, and fourth predetermined time have different corresponding actual times due to their respective states. Exemplarily, before paper jamming occurs, the running speed of the driving unit 306 is V1. Correspondingly, the speed at which the driving unit 306 drives the image carrier member 301 to rotate is V3. When a paper jam occurs and after recovering from the paper jam state, the running speed of the driving unit starts from V2 (V2 < V1) until it reaches V1. Correspondingly, the speed at which the driving unit 306 drives the image carrier member 301 to rotate starts from V4 until V3 (V4 < V3). Then, after recovering from the paper jam state to the normal state, the time for the control unit 307 to control the driving unit 306 to run and the time T3 required for the surface of the image carrier member 301 to rotate from the position corresponding to the charging member 302 to the position corresponding to the developing member 303 are longer than the time for the control unit 307 to control the driving unit 306 to run and the time T2 required for the surface of the image carrier member 301 to rotate from the position corresponding to the charging member 302 to the position corresponding to the developing member 303 in the normal state before the paper jam occurred (T3 > T2).

[0062] In one implementation, when the image forming apparatus 300 is in a paper jam state, the control unit 307 controls the supply of power to the developing voltage applying unit 305, including: when the image forming apparatus 300 is in a paper jam state, the control unit 307 controls the supply of power to the developing voltage applying unit 305 that is the same as the power value before the paper jam occurred in the image forming apparatus 300, or the control unit 307 controls the supply of a power value K1 different from the power value K before the paper jam occurred in the image forming apparatus 300 to the developing voltage applying unit 305, and the power value K1 ∈ [K - 50, K + 50].

[0063] In an image forming apparatus provided in an embodiment of the present application, a control unit controls the supply of power to a developing voltage applying unit, i.e., controls the supply of power to a developing member, when the image forming apparatus recovers from a paper jam. The supplied power value K1 is the same as the power value K before the paper jam, i.e., K1=K. Alternatively, the supplied power value K1 is within a predetermined range of the power value K before the paper jam, such as K1∈[K-50,K+50]. In this way, by controlling the power value after the paper jam to be not significantly different from the power value in the normal state before the paper jam, it is possible to ensure that, after the image forming apparatus recovers from a paper jam, the electric field relationship between the developing member and the image bearing member still meets normal development conditions (e.g., the voltage drop formed between the developing roller and the image bearing member falls within a normal voltage drop range, the electric field force is not much greater than the magnetic field force, and the toner is adsorbed on the surface of the photosensitive drum for normal development). This prevents the carrier from being adsorbed to the surface of the image bearing member to form an undesirable developed image that contaminates the desired image due to the electric field between the developing member and the image bearing member not meeting the normal development conditions, and the carrier from being unnecessarily consumed.

[0064] An embodiment of the present application provides a control method for an image forming device, wherein the image forming device includes a photosensitive drum, a charging roller, a charging voltage applying unit, a developing roller, a developing voltage applying unit, and a motor; wherein the charging roller is configured to form a charging portion by contacting the photosensitive drum and to charge the surface of the photosensitive drum at the charging portion; the developing roller is located in the rotation direction of the image bearing member and downstream of the charging member along the rotation direction, and is configured to supply developer to the photosensitive drum at the developing portion facing the photosensitive drum; the charging voltage applying unit is configured to apply a charging voltage to the charging roller; the developing voltage applying unit is configured to apply a developing voltage to the developing roller; the motor is configured to drive the photosensitive drum, the charging roller, and the developing roller to rotate, and the method includes: controlling the time for supplying power to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming device, and controlling the time for the motor to run to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position area.

[0065] Please refer to Figure 4 Figure 1 is a schematic diagram of the timing sequence for controlling the motor, charging voltage, and developing voltage in a conventional image forming apparatus. In the figure, after the image forming apparatus is powered on, at time t1, the control unit controls the motor to begin rotating and supplies power to the charging voltage application unit, providing a charging voltage to the charging roller to charge the photosensitive drum. After time t1, at time t2, the control unit controls the development voltage application unit to supply a developing voltage, thereby applying developer to the photosensitive drum surface. If a paper jam occurs in the image forming apparatus, at time t3, the motor stops rotating, the charging voltage stops supplying, and the development voltage stops supplying.

[0066] In one embodiment, when the image forming apparatus is in a paper jam state, power is controlled to be supplied to the developing voltage applying unit and the power supply is stopped after a first predetermined time has passed; power is controlled to be stopped to the charging voltage applying unit; and the driving unit is controlled to operate and stop operating after a second predetermined time has passed.

[0067] Specifically, please refer to Figure 5 , is a schematic diagram of the timing of a motor, charging voltage, and developing voltage control provided by an embodiment of the present application. In the figure, when the image forming device is in a paper jam state (at time t3), unlike the prior art, the control unit of the image forming device controls the supply of power to the developing voltage applying unit, and stops the power supply at time t4 after a first predetermined time; controls the stop of the supply of power to the charging voltage applying unit; and controls the rotation of the motor, and stops the rotation at time t4 after a second predetermined time, wherein the first predetermined time and the second predetermined time may be different from time T1 or the same. Moreover, the first predetermined time and the second predetermined time may also be other identical times or different times. As long as the time is sufficient to eliminate the residual charge in the S area of ​​the photosensitive drum surface, it is consistent with the relevant description above and will not be repeated here.

[0068] The control method for an image forming device provided in an embodiment of the present application, when a paper jam occurs in the image forming device, stops the charging roller from charging the photosensitive drum surface, while continuing to supply power to the developing roller and continuing to rotate the motor, thereby driving the photosensitive drum and developing roller to rotate normally for a period of time, which is exactly the time required for the S area of ​​the photosensitive drum surface to rotate from position S1 to position S2. This method, compared to the prior art in which the power supply to the charging roller and developing roller is stopped and the motor is stopped when a paper jam occurs, can solve the problem that the charge remaining in the S area of ​​the photosensitive drum surface, which has been charged by the charging roller, cannot be absorbed by the developing roller to perform normal development due to the cessation of power supply to the developing roller due to the paper jam, resulting in abnormal carrier consumption. This abnormal development forms a developed image that affects the actual image quality. Because the voltage supply to the developing roller is not immediately stopped after a paper jam occurs in the image forming device, a normal development voltage drop still exists between the developing roller and the photosensitive drum, resulting in a normal electric and magnetic field relationship between the developing roller and the photosensitive drum. If the electric field is not significantly greater than the magnetic field, the magnetic field relationship is normal. The magnetic carrier will not be attracted to the photosensitive drum surface to form a carrier image due to the magnetic field being too strong, causing the carrier to be unable to maintain its normal position due to the magnetic field being much smaller than the electric field. After a period of time sufficient to properly develop the residual charge in the S region, the voltage supply to the developing roller is stopped, and the motor rotation is stopped.

[0069] In one embodiment, when the image forming apparatus returns to normal operation from a paper jam, power is supplied to the developing voltage applying unit. After a third predetermined time has passed since power was supplied to the developing voltage applying unit, power is supplied to the charging voltage applying unit. The third predetermined time may be the same as or different from time T1, and may also be another time. As long as the third predetermined time is sufficient to eliminate residual charge in region S of the photosensitive drum surface, this time is consistent with the previous description and will not be further elaborated here.

[0070] Specifically, please refer to Figure 6 , a schematic diagram of a motor, charging voltage, and developing voltage control timing provided by an embodiment of the present application. In the diagram, when the image forming device returns to a normal state (t5) from a paper jam state (t3), a control unit in the image forming device controls the supply of developing voltage and motor rotation, and then, after a third predetermined time, such as T1, supplies the charging voltage again at time t6. Thus, for the charge remaining on the photosensitive drum surface area S before a paper jam occurs in the image forming device, when it first passes through the developing section, compared to the prior art where no developing voltage is supplied at this time, the developing roller can normally supply developer, and toner in addition to the carrier, to the photosensitive drum surface. This allows normal development operations to be performed without causing the residual charge electric field on the photosensitive drum surface area S to be significantly greater than the magnetic field force when passing through the developing section due to the absence of the developing voltage, causing the carrier to be attracted to the photosensitive drum surface, forming a developed image, contaminating the actual image, and causing unnecessary carrier consumption.

[0071] In one embodiment, when the image forming apparatus returns to normal operation from a paper jam, the drive unit is controlled to operate in a direction opposite to the direction in which the image forming apparatus was operating before the paper jam occurred. After the drive unit has been operating for a fourth predetermined time, the drive unit is controlled to operate in the same direction as the direction in which the image forming apparatus was operating before the paper jam occurred, and power is supplied to the charging voltage applying unit. The fourth predetermined time may be the same as or different from time T1, and may also be another time. As long as this time is sufficient to eliminate residual charge in area S of the photosensitive drum surface, it is consistent with the previous description and will not be further elaborated here.

[0072] Specifically, please refer to Figure 7, is a schematic diagram of a motor, charging voltage, and developing voltage control timing provided by an embodiment of the present application. In the diagram, when the image forming device returns to a normal state (t5) from a paper jam state (t3), a control unit in the image forming device controls the motor to reverse for a fourth predetermined time. The fourth predetermined time may be the same as or different from time T1. Specifically, the fourth predetermined time is the time required for the motor to drive the photosensitive drum surface position corresponding to the developing roller position S2 to reverse from the corresponding developing roller position S2 to the corresponding charging roller position S1. For example, the fourth predetermined time is considered to be the same as time T1. After the fourth predetermined time T1, at time t7, the charging voltage is supplied to the charging roller. After the fifth predetermined time T1, at time t8, the developing voltage is supplied to the developing roller. The fifth predetermined time may be the same as or different from time T1, and is not specifically limited here. Preferably, the fifth predetermined time is considered to be the same as time T1. This ensures that even if a paper jam occurs during imaging, the image forming device can still perform normal imaging when it returns to a normal state from the paper jam state, without causing other problems that could affect image quality.

[0073] The control method for an image forming device provided in an embodiment of the present application is to reversely run the motor for a period of time after a paper jam occurs in the image forming device, and then reversely rotate the surface position of the photosensitive drum corresponding to the developing roller position from the corresponding developing roller position to the corresponding charging roller position. Then, the normal timing control of supplying the charging voltage and developing voltage after the image forming device is turned on is started, that is, the charging voltage is supplied for a period of time, and after a period of time, the developing voltage is again supplied. In this way, the residual charge in the S area of ​​the photosensitive drum surface is first returned to the charging part, and after being charged to the normal charging voltage by the charging roller, the normal developing operation is performed in the developing part. This prevents the residual charge in the S area of ​​the photosensitive drum surface due to the paper jam from first reaching the developing part and being abnormally developed, consuming the carrier, and forming a developed image that contaminates the actual image.

[0074] In one embodiment, after the S area of ​​the photosensitive drum surface undergoes a normal development operation using the above-described method, the S area of ​​the photosensitive drum surface, regardless of whether or not a normal transfer operation is performed, undergoes a de-electrification operation to de-electrify the charge remaining on the photosensitive drum surface, converting it to a charge with a rated voltage. For example, the S area of ​​the photosensitive drum surface passes through the de-electrification unit, where the voltage carried by the surface charge is de-electrified to a rated voltage, such as -20V. This reduces the residual charge to the rated voltage value, facilitating normal charging of the charge with the same voltage the next time it passes through the charging unit. In this way, the residual charge in the S area of ​​the photosensitive drum surface caused by a paper jam can be processed, preventing carrier development in the developing unit, which consumes the carrier and forms a developed image that contaminates the actual image.

[0075] Please refer to Figure 8 , is a driving control schematic diagram provided by an embodiment of the present application, including the following Figure 1The image bearing member, namely the photosensitive drum 10, the charging unit 11, the exposure unit 12, the developing unit 13, the transfer unit 14, the fixing unit (not shown), the de-electrification unit 15, and the cleaning unit 16, also includes a drive, such as a motor 80, a transmission system 81, and a transmission system 82. The developing unit 13 includes a powder supply screw 131 configured to supply developer to the developing roller, and a stirring screw 132 configured to stir the developer in the developing unit 13. The transmission system 81 controls the operation of the image bearing member 10, such as controlling the image bearing member 10 to rotate clockwise at a first predetermined speed. The transmission system 82 controls the operation of the developing unit 13, such as controlling the stirring screw 132 in the developing unit 13 to start stirring, controlling the powder supply screw 131 to start supplying powder to the developing roller, and controlling the developing roller to start rotating counterclockwise at a second predetermined speed. The first predetermined speed is different from the second predetermined speed. Preferably, the second predetermined speed is faster than the first predetermined speed. When the second predetermined speed is faster than the first predetermined speed, even if the developing roller jumps during rotation, it can ensure that the powder supply screw supplies a relatively saturated developer concentration to the developing roller, thereby ensuring the quality of the developed image. This is because the surface of the developing roller is not actually completely smooth and has small fluctuations. Therefore, when the developing roller rotates, it may jump. Due to the fluctuations on the surface of the developing roller, the concentration of the developer may be lower when the developer is supplied to the photosensitive drum for the low part. Therefore, the developed image formed on the photosensitive drum will be lighter than the developed image formed with a normal developer concentration. However, if the speed of the developing roller is faster than that of the photosensitive drum, then within the same time, the powder supply screw can supply a more saturated developer concentration to the developing roller, and the developing roller can then supply a relatively saturated developer concentration to the photosensitive drum, thereby forming a normal developed image on the photosensitive drum. When the image forming apparatus issues a command to the driver to initiate driving, motor 80 controls transmission system 81 to cause the photosensitive drum to begin rotating clockwise at a first predetermined speed. The charging roller in the charging unit, through friction with the photosensitive drum, begins rotating counterclockwise. Simultaneously, motor 80 controls transmission system 82 to cause the developing roller to begin rotating counterclockwise at a second predetermined speed. In one embodiment, when the image forming apparatus issues a command to the driver to initiate driving, both transmission system 81 and transmission system 82 are driven simultaneously. Similarly, when the image forming apparatus issues a command to the driver to stop driving, motor 80 controls transmission system 81 to stop the rotation of the photosensitive drum driven by transmission system 81, and further stops the rotation of the charging roller driven by friction with the photosensitive drum. Simultaneously, motor 80 controls transmission system 82 to stop the rotation of the developing roller driven by transmission system 82.

[0076] In addition, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored, characterized in that the steps of the above method are implemented when the program is executed.

[0077] It is understood that the structures illustrated in the embodiments of this application do not constitute specific limitations on the image forming device. In other embodiments of this application, the image forming device may include more or fewer components than illustrated, or may combine or separate certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0078] In the description of this application, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more, and the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An image forming apparatus comprising: an image bearing member configured to rotate; a charging member configured to charge a surface of the image bearing member by coming into contact with the image bearing member; a developing member located in a rotational direction of the image bearing member and downstream of the charging member in the rotational direction, the developing member being configured to supply a developer to the image bearing member; a charging voltage applying unit configured to apply a charging voltage to the charging member; a developing voltage applying unit configured to apply a developing voltage to the developing member; a driving unit configured to drive the image bearing member, the charging member, and the developing member to rotate; Characterized in that the image forming device further comprises: A control unit configured to control a timing for supplying power to the charging voltage applying unit and the developing voltage applying unit, and to control a timing for operating the driving unit, so as to eliminate charges in areas of the image bearing member corresponding to the charging member position and the developing member position, according to a current state of the image forming apparatus, wherein the state of the image forming apparatus includes a paper jam state and / or recovery from a paper jam state to a normal state.

2. The device according to claim 1, characterized in that The control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and controls the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus, including: When the image forming apparatus is in a paper jam state, the control unit controls the supply of power to the developing voltage applying unit, controls the stop of the supply of power to the charging voltage applying unit, and controls the driving unit to operate to eliminate the charge of the area corresponding to the charging member position and the developing member position on the image bearing member.

3. The device according to claim 2, characterized in that The control unit controls the supply of power to the development voltage applying unit, specifically including: the control unit controls the supply of power to the development voltage applying unit and stops the power supply after a first predetermined time has passed; and Controlling the driving unit to operate specifically includes: controlling the driving unit to operate, and stopping the operation of the driving unit after a second predetermined time has passed.

4. The device according to claim 1, characterized in that The control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and controls the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus, and further includes: When the image forming apparatus recovers from a paper jam state to a normal state, the control unit controls the supply of power to the developing voltage applying unit, and after a third predetermined time has passed since the power was supplied to the developing voltage applying unit, supplies power to the charging voltage applying unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position area.

5. The device according to claim 1, characterized in that The control unit controls the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and controls the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus, and further includes: When the image forming apparatus recovers from a paper jam state to a normal state, the control unit controls the driving unit to operate in a direction opposite to the direction in which the image forming apparatus was operating before the paper jam occurred, and after the driving unit has operated for a fourth predetermined time, controls the driving unit to operate in a direction identical to the direction in which the image forming apparatus was operating before the paper jam occurred, and controls the supply of power to the charging voltage applying unit to eliminate the charge in the area on the image bearing member corresponding to the charging member position and the developing member position.

6. The device according to claim 3, characterized in that The first predetermined time and the second predetermined time are times required for the image bearing member to rotate from a position corresponding to the charging member to a position corresponding to the developing member; or, The first predetermined time and the second predetermined time are longer than the time required for the image bearing member, the charging member, and the developing member to stop rotating when a paper jam occurs in the image forming apparatus, and are shorter than the time corresponding to the time difference between when the charging voltage applying unit and the developing voltage applying unit start supplying power.

7. The device according to claim 4, characterized in that The third predetermined time is the time required for the image bearing member to rotate from the position corresponding to the charging member to the position corresponding to the developing member, or the third predetermined time is the time corresponding to the time difference between the time when the charging voltage applying unit starts supplying voltage to the charging member and the time when the developing voltage applying unit starts supplying voltage to the developing member.

8. The device according to claim 5, characterized in that The fourth predetermined time is the time required for the image bearing member to rotate from the position corresponding to the developing member to the position corresponding to the charging member, or the fourth predetermined time is the time corresponding to the time difference between the time when the charging voltage applying unit starts supplying voltage to the charging member and the time when the developing voltage applying unit starts supplying voltage to the developing member.

9. A method for controlling an image forming device, characterized in that: The image forming apparatus includes an image bearing member, a charging member, a charging voltage applying unit, a developing member, a developing voltage applying unit, and a driving unit; wherein the charging member is configured to charge a surface of the image bearing member by contacting the image bearing member; the developing member is located in a rotational direction of the image bearing member and downstream of the charging member in the rotational direction, and is configured to supply a developer to the image bearing member; the charging voltage applying unit is configured to apply a charging voltage to the charging member; the developing voltage applying unit is configured to apply a developing voltage to the developing member; the driving unit is configured to drive the image bearing member, the charging member, and the developing member to rotate; the method includes: According to the current state of the image forming apparatus, the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit, and the timing of operating the driving unit are controlled to eliminate the charge in the areas corresponding to the charging member position and the developing member position on the image bearing member, wherein the state of the image forming apparatus includes a paper jam state and / or recovery from a paper jam state to a normal state.

10. The method according to claim 9, characterized in that The controlling of the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus comprises: When the image forming apparatus is in a jam state, power is supplied to the developing voltage applying unit by controlling the power supply, and after a first predetermined time has passed, the power supply is stopped; power is supplied to the charging voltage applying unit by controlling the power supply is stopped; and the driving unit is controlled to operate, and after a second predetermined time has passed, the driving unit is stopped to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position area.

11. The method according to claim 9, characterized in that The method further comprises controlling the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and controlling the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus. When the image forming apparatus recovers from a paper jam state to a normal state, power is controlled to be supplied to the developing voltage applying unit, and after a third predetermined time has passed since power was supplied to the developing voltage applying unit, power is supplied to the charging voltage applying unit to eliminate the charge on the image bearing member corresponding to the charging member position and the developing member position area.

12. The method according to claim 9, characterized in that The method further comprises controlling the timing of supplying power to the charging voltage applying unit and the developing voltage applying unit and controlling the timing of operating the driving unit to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position according to the current state of the image forming apparatus. When the image forming apparatus recovers from a paper jam state to a normal state, the driving unit is controlled to run in a direction opposite to the running direction of the image forming apparatus before the paper jam occurs, and after the driving unit runs for a fourth predetermined time, the driving unit is controlled to run in the same direction as the running direction of the image forming apparatus before the paper jam occurs, and power is controlled to be supplied to the charging voltage applying unit to eliminate the charge of the area corresponding to the charging member position and the developing member position on the image bearing member.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed, the steps of the method according to any one of claims 9 to 12 are implemented.

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