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 carrier, a charging member, a developing member, a drive unit, and a control unit. The drive unit rotates the image carrier, charging member, and developing member. The control unit controls the timing of applying voltage to the charging member and the developing member based on the current state of the image forming device, and controls the operating state of the drive unit to eliminate the charge on the image carrier corresponding to the charging member position and the developing member position. This prevents unnecessary carrier consumption and contamination of the actual image by the developed 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 an electrostatic voltage. 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 driving unit configured to drive the image bearing member, the charging member, and the developing member to rotate;

[0009] The image forming apparatus further includes a control unit configured to adjust a control timing for applying voltage to the charging member and the developing member according to a current state of the image forming apparatus, and to control an operating state of the driving unit to eliminate electric charge in areas of the image bearing member corresponding to positions of the charging member and the developing member.

[0010] In one embodiment, the apparatus further comprises: a charging voltage applying unit configured to apply a charging voltage to the charging member;

[0011] a developing voltage applying unit configured to apply a developing voltage to the developing member;

[0012] a voltage supply unit configured to supply a voltage to the charging voltage applying unit and the developing voltage applying unit;

[0013] The control unit is further configured to control a timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit and to control an operation state of the driving unit according to a current state of the image forming apparatus.

[0014] In one embodiment, the control unit adjusts the control timing of applying voltage to the charging member and the developing member according to the current state of the image forming apparatus, and controls the operating state of the driving unit, including:

[0015] When the image forming apparatus is in a jam state, the control unit controls the start of voltage supply to the developing member, controls the stop of voltage supply to the charging member, and controls the driving unit to operate.

[0016] In one embodiment, the control unit controls the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controls the operating state of the driving unit according to the current state of the image forming apparatus, including:

[0017] When the image forming apparatus is in a paper jam state, the control unit controls the development voltage applying unit to start supplying voltage, controls the charging voltage applying unit to stop supplying voltage, and controls the driving unit to operate.

[0018] In one embodiment, the control unit controls the start of the development voltage applying unit supplying voltage, specifically comprising: the control unit controls the start of the development voltage applying unit supplying voltage, and controls the stop of the development voltage applying unit supplying voltage after a first predetermined time has passed; and

[0019] 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.

[0020] In one embodiment, the control unit controls the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controls the operating state of the driving unit according to the current state of the image forming apparatus, further comprising:

[0021] When the image forming apparatus recovers from a paper jam state to a normal state, the control unit controls the start of the developing voltage applying unit supplying voltage, and after a third predetermined time has passed since the developing voltage applying unit started supplying voltage, controls the start of the charging voltage applying unit supplying voltage, and controls the operation of the driving unit.

[0022] In one embodiment, the control unit controls the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controls the operating state of the driving unit according to the current state of the image forming apparatus, further comprising:

[0023] When the image forming device 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 of the image forming device before the paper jam occurs, and controls the charging voltage applying unit to start supplying voltage after the driving unit runs for a fourth predetermined time.

[0024] 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

[0025] The first predetermined application time and the second predetermined time are a time that exceeds 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 does not exceed a time corresponding to a time difference between when the charging voltage applying unit starts supplying voltage to the charging member and when the developing voltage applying unit starts supplying voltage.

[0026] 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 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.

[0027] 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.

[0028] On the other hand, an embodiment of the present application further provides a method for controlling an image forming apparatus, the image forming apparatus comprising an image bearing member, a charging member, a developing member, and a driving unit; wherein the image bearing member is configured to rotate; 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 driving unit is configured to drive the image bearing member, the charging member, and the developing member to rotate; the method comprising:

[0029] According to the current state of the image forming apparatus, the control timing of applying voltage to the charging member and the developing member is adjusted, and the operation state of the driving unit is controlled to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position area.

[0030] In one embodiment, the control unit adjusts the control timing of applying voltage to the charging member and the developing member according to the current state of the image forming apparatus, and controls the operating state of the driving unit, including:

[0031] When the image forming apparatus is in a jam state, the control unit controls the start of voltage supply to the developing member, controls the stop of voltage supply to the charging member, and controls the driving unit to operate.

[0032] In one embodiment, the device further includes a charging voltage applying unit, a developing voltage applying unit, and a voltage supply unit, wherein the charging voltage applying unit is configured to apply a charging voltage to the charging component, the developing voltage applying unit is configured to apply a developing voltage to the developing component, and the voltage supply unit is configured to supply voltage to the charging voltage applying unit and the developing voltage applying unit; the method further includes: controlling the timing of the voltage supply unit supplying voltage 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 operating state of the driving unit.

[0033] In one embodiment, controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the operating state of the driving unit according to the current state of the image forming apparatus includes:

[0034] When the image forming device is in a paper jam state, the developing voltage applying unit is controlled to start supplying voltage, and after a first predetermined time, the developing voltage applying unit is controlled to stop supplying voltage; the charging voltage applying unit is controlled to stop supplying voltage; and the driving unit is controlled to run and stop running after a second predetermined time.

[0035] In one embodiment, controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and controlling the operating state of the driving unit further includes:

[0036] When the image forming apparatus recovers from a jam state to a normal state, the developing voltage applying unit is controlled to start supplying voltage, and after a third predetermined time has passed since the developing voltage applying unit started supplying voltage, the charging voltage applying unit is controlled to start supplying voltage, and the operation of the driving unit is controlled.

[0037] In one embodiment, controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and controlling the operating state of the driving unit further includes:

[0038] When the image forming device recovers to a normal state from a paper jam state, the driving unit is controlled to run in a direction opposite to the running direction of the image forming device 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 same as the running direction of the image forming device before the paper jam occurs, and the charging voltage applying unit is controlled to start supplying voltage.

[0039] 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.

[0040] The embodiments of the present application control the time for supplying voltage 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 for the driving unit to operate, thereby eliminating the charge in the areas corresponding to the charging component position and the developing component position 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

[0041] 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.

[0042] 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;

[0043] 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;

[0044] Figure 3A An exemplary diagram of some modules of an image forming device provided in an embodiment of the present application;

[0045] Figure 3B An exemplary diagram of some modules of another image forming device provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of the control timing of a motor, charging voltage, and developing voltage provided by the prior art;

[0047] 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;

[0048] 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;

[0049] 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;

[0050] Figure 8 A drive control schematic diagram provided in an embodiment of the present application. [Specific implementation method]

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 functions related to image formation may include but are not limited to: printing function, scanning function, copying function, and fax function. For example: Single-function printer: an image forming device with only a printing function. Multi-function printer: an image forming device with printing, copying, scanning and / or faxing functions, and the number of paper trays can also be selectively set. Digital multifunction printer: based on the copying function, with standard or optional printing, scanning and faxing functions, using digital principles, and outputting files in the form of laser printing, can edit images and text as needed, has a large-capacity paper tray, high memory, a large hard disk, strong network support and multi-task parallel processing capabilities.

[0056] 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:

[0057] 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 along the rotation direction of the image bearing member 10. Furthermore, the developing member is located in the rotation direction of the photosensitive drum and is located downstream of the charging member along the rotation direction of the photosensitive drum. 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 direction of clockwise rotation 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. The exposure unit 12 exposes the photosensitive drum to form an electrostatic latent image based on the image data to be printed. A developing voltage application unit (not shown) applies a developing voltage to the developing unit 13, which develops the electrostatic latent image to form a developed image on the surface of the photosensitive drum. The developed image is then transferred to paper via a transfer unit. This transfer unit can be a single transfer unit or a combination of a primary and secondary transfer units. 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 untransferred developer remaining on the photosensitive drum. Developers are divided into charged toner and charged carriers, with the toner and carrier having opposite charges. For the convenience of explaining the present embodiment, the charged toner is exemplarily considered to be positively charged and the charged carrier is considered to be negatively charged.

[0058] The image forming apparatus further includes a voltage supply unit, a charging voltage application unit, and a developing voltage application unit. The voltage supply unit is configured to supply voltage to the charging voltage application unit and the developing voltage application unit. The charging voltage application unit and the developing voltage application unit may be two independent, mutually non-interfering voltage application units, with the charging voltage application unit configured to apply a charging voltage to the charging member, and the developing voltage application unit configured to apply a developing voltage to the developing member. The charging voltage application unit and the developing voltage application unit may also be an integrated voltage application unit capable of applying voltage to the charging member and the developing member simultaneously or in a time-sharing manner. The charging voltage application unit and the developing voltage application unit may be supplied with voltage from the same voltage source or from different voltage sources. For example, the charging voltage application unit and the developing voltage application unit may be supplied with voltage from the same voltage supply unit or from two voltage supply units. When the charging voltage application unit and the developing voltage application unit are supplied with voltage from the same voltage supply unit, the charging voltage application unit and the developing voltage application unit are electrically connected to a voltage distribution unit, which in turn is electrically connected to the voltage supply unit. The voltage distribution unit is configured to distribute and control the voltage application and convert the voltage according to the control timing of the voltage application to the charging member and the developing member. Alternatively, the charging voltage applying unit and the developing voltage applying unit are directly electrically connected to the voltage supply unit. The voltage supply unit is further configured to convert a voltage into a voltage suitable for the charging voltage applying unit and the developing voltage applying unit, and to distribute the charging voltage to the charging member and the developing voltage to the developing member under the control of the control timing of the voltage application of the charging member and the developing member. It should be noted that the image forming apparatus may also have only one voltage supply unit, which is electrically connected to the charging member and the developing member and can directly supply voltage to the charging member and the developing member, without the need for the charging voltage applying unit and the developing voltage applying unit.

[0059] 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, the voltage supply to the photosensitive drum, charging roller, and developing roller is stopped. Consequently, residual charge, applied by the charging roller, may remain in the region S on the photosensitive drum surface between the charging roller position S1 and the developing roller position S2. When the jam occurs, the voltage supply from the charging voltage application unit is disconnected, causing the voltage of this portion of charge to drop. When the jam is resolved, this residual charge first reaches 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 cause, for example, the electric field force generated by the charge between the developing roller and the photosensitive drum to be 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 only a limited number of carriers within their life cycle. Therefore, to ensure the longevity of the image forming device, reducing carrier consumption is essential.

[0060] 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 normal image formation in the image forming apparatus, the image forming apparatus control unit first activates a driver, such as a motor, to initiate rotation, and controls the voltage supply unit to begin applying voltage to the charging voltage application unit, thereby supplying power to the charging roller. The charging roller then contacts the photosensitive drum, forming a charged portion and charging the photosensitive drum surface. After a predetermined time T1, the voltage supply unit then controls the developing voltage application unit to begin supplying power to the developing roller. If a paper jam occurs in the image forming apparatus, the area between the charging roller and the developing roller will retain charge from the charging roller until the apparatus returns to normal. Because the application of the developing roller voltage begins 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 passes the developing roller before the developing roller has applied voltage. Therefore, due to the electric field, the developing carrier is attracted to this area, forming an image, consuming the developing carrier. The developed image formed by the developing carrier can contaminate the actual image.

[0061] Therefore, to solve the above problems, please refer to Figure 3A , which is a partial structural example diagram of an image forming device provided in an embodiment of the present application, such as Figure 3A As shown, the image forming apparatus 300 includes an image bearing member 301, a charging member 302, a developing member 303, a driving unit 306, and a control unit 307. 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 rotational direction of the image bearing member 301 and downstream of the charging member 302 in the rotational direction of the image bearing member 301, and is configured to supply developer to the image bearing member 301; the driving unit 306 is configured to drive the image bearing member 301, the charging member 302, and the developing member 303 to rotate; and the control unit 307 is configured to adjust the control timing of applying voltage to the charging member 302 and the developing member 303 according to the current state of the image forming apparatus 300, and to control the operation state of the driving unit 306, so as to eliminate the charge in the area between the position of the charging member 302 and the position of the developing member 303 on the image bearing member 301 after a paper jam. Specifically, in one embodiment, the control unit 307 adjusts the control timing of applying voltage to the charging member 302 and the developing member 303 according to the current state of the image forming apparatus 300, and controls the operation state of the driving unit 306, including: when the image forming apparatus 300 is in a paper jam state, the control unit 307 controls the start of supplying voltage to the developing member 303, controls the stop of supplying voltage to the charging member 302, and controls the operation of the driving unit 306. Please refer to Figure 3B The image forming apparatus 300 further includes a charging voltage applying unit 304, a developing voltage applying unit 305, and a voltage supply unit 308. 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; and the control unit 307 is further configured to control the timing of the voltage supply unit 308 supplying voltage to the charging voltage applying unit 304 and the developing voltage applying unit 305, and to control the operating state of the driving unit 306, according to the current state of the image forming apparatus 300, so as to eliminate the charge of the areas corresponding to the positions of the charging member 302 and the developing member 303 on the image bearing member 301.

[0062] In one embodiment, the control unit 307 adjusts the control timing of applying voltage to the charging member 302 and the developing member 303 according to the current state of the image forming device 300, and controls the operating state of the driving unit 306 to eliminate the charge in the area corresponding to the position of the charging member 302 and the position of the developing member 303 on the image bearing member 301, including: when the image forming device 300 is in a paper jam state, the control unit 307 controls the voltage supply unit 308 to start supplying voltage to the developing voltage applying unit 304, controls the voltage supply unit 308 to stop supplying voltage to the charging voltage applying unit 304, and controls the driving unit 306 to operate to eliminate the charge in the area corresponding to the position of the charging member 302 and the position of the developing member 303 on the image bearing member.

[0063] Specifically, the control unit 307 controls the voltage supply unit 308 to start supplying voltage to the development voltage applying unit 305, and controls the voltage supply unit 308 to stop supplying voltage after a first predetermined time has passed. The control unit 307 controls the driving unit 306 to operate, and specifically controls the driving unit 306 to operate and stop operating after a second predetermined time has passed.

[0064] In the image forming apparatus 300 provided in the embodiment of the present application, when the image forming apparatus 300 is in a paper jam state, the control unit 307 controls the voltage supply unit 308 to start supplying voltage to the development voltage applying unit 305, and controls the voltage supply unit 308 to stop supplying voltage after a first predetermined time, and controls the driving unit 306 to operate and stop operating after a second predetermined time. Thus, when a paper jam occurs in the image forming apparatus 300, the voltage supplied to the development member 303 is not immediately stopped, so that a normal development voltage drop still exists between the development member 303 and the image bearing member 301, and a normal electric field and magnetic field relationship exists between the development member 303 and the image bearing member 301. If the electric field is not significantly greater than the magnetic field, the magnetic field relationship is normal, and the magnetic carrier is not attracted to the surface of the image bearing member 301 to form a carrier image, as the magnetic field is significantly smaller than the electric field, which would otherwise cause the carrier to be unable to be properly retained due to the excessively strong electric field. After a first predetermined time has passed, the supply of power to the developing member 303 is stopped, and the driving unit 306 is stopped. This time is sufficient to complete the normal development of the charge remaining in the portion of the image bearing member 301 corresponding to the charging member position and the developing member position. Compared to the case where, after a paper jam occurs in the image forming apparatus 300, the control unit 307 controls the voltage supply unit 308 to stop supplying voltage to the development voltage applying unit 305 and applying voltage to the charging voltage applying unit 304, and controls the driving unit 306 to stop operating, the charge remaining in the portion of the image bearing member 301 corresponding to the charging member 302 and the developing member 303 can be eliminated. This solves the problem that the charge remaining in the portion of the image bearing member 301 corresponding to the charging member 302 and the developing member 303, due to the paper jam, the power supply to the developing member 303 is stopped, and the toner cannot be absorbed in the developing portion to perform normal development, resulting in abnormal carrier consumption. The abnormal development results in a developed image that affects the quality of the actual image.

[0065] In one embodiment, the control unit 307 adjusts the control timing of applying voltage to the charging member 302 and the developing member 303 according to the current state of the image forming device 300, and controls the operating state of the driving unit 306, further comprising: when the image forming device 300 recovers from a paper jam state to a normal state, the control unit controls the voltage supply unit 308 to start supplying voltage to the developing voltage applying unit 305, and after a third predetermined time has passed since the voltage supply unit 308 starts supplying voltage to the developing voltage applying unit 305, controls the voltage supply unit 308 to start supplying voltage to the charging voltage applying unit 304, and controls the driving unit 306 to operate.

[0066] The image forming device 300 provided in the embodiment of the present application, when recovering from the paper jam state to the normal state after a paper jam occurs, the control unit 307 controls the voltage supply unit 308 to start supplying voltage to the developing voltage applying unit 305, and after a predetermined time has passed since the voltage supply unit 308 started supplying voltage to the developing voltage applying unit 305, controls the start of supplying voltage to the charging voltage applying unit 304, and controls the operation of the driving unit 306. In this way, for the charges in the areas corresponding to the charging member 302 position and the developing member 303 position on the image bearing member 301 when they first pass through the developing part, compared with the existing technology in which the developing voltage has not been supplied at this time, since the developing voltage can be supplied in time, the developing member 303 can normally supply the developer to the surface of the image bearing member 301, and supply the colorant other than the carrier to the surface of the image bearing member 301. In this way, normal developing operations can be performed, and the electric field force of the areas corresponding to the charging member 302 position and the developing member 303 position on the image bearing member 301 is much greater than the magnetic field force due to the influence of the residual charge electric field when the developing voltage is not turned on, causing the carrier to be adsorbed on the surface of the image bearing member 301 to form a developed image, polluting the actual image, and causing the carrier to be consumed unnecessarily.

[0067] In one embodiment, the control unit 307 adjusts the control timing of applying voltage to the charging member 302 and the developing member 303 according to the current state of the image forming device 300, and controls the operating state of the driving unit 306 to eliminate the charge in the area corresponding to the position of the charging member 302 and the position of the developing member 303 on the image bearing member 301. 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 voltage supply unit 308 to start supplying voltage to the charging voltage applying unit 304 to eliminate the charge in the area corresponding to the position of the charging member 302 and the position of the developing member 303 on the image bearing member 301.

[0068] like Figure 1As shown, the image bearing member 301 in the image forming apparatus 300, such as the photosensitive drum 10, 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.

[0069] In the image forming apparatus 300 provided in the embodiment of the present application, after a paper jam occurs and the apparatus 300 returns to normal operation, the control unit 307 controls the image bearing member 301 to rotate in the direction opposite to the direction in which the apparatus 300 was operating before the jam. After a predetermined period of driving, the surface of the image bearing member 301 rotates in the opposite direction from the position corresponding to the developing member 303 to the position corresponding to the charging member 302. Then, the control unit 307 controls the normal voltage supply timing control for the charging voltage applying unit 304 and the developing voltage applying unit 305 after the apparatus 300 is turned on. Specifically, the control unit 307 starts supplying a charging voltage to the charging voltage applying unit 304 and, after a period of time, resumes supplying a developing voltage to the developing voltage applying unit 305. In this manner, the charge in the areas of the image bearing member 301 corresponding to the charging member 302 and the developing member 303 is first returned to the corresponding charging portion of the charging member 302. After the charge is charged to the normal charging voltage, the normal developing operation is then performed in the corresponding developing portion of the developing member 303. Therefore, the residual charge in the area corresponding to the charging member 302 and the developing member 303 on the image bearing member 301 will not reach the developing part first due to paper jam and be abnormally developed, consuming the carrier and forming a developed image that pollutes the actual image.

[0070] 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 apparatus 300, and do not exceed 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. Figure 5 In one embodiment, the time corresponding to the time difference between the time when the charging voltage applying unit 304 starts to supply voltage to the charging member 302 and the time when the developing voltage applying unit 305 starts to supply voltage to the developing member 303 is the time corresponding to the absolute time difference between when, after the image forming apparatus 300 is turned on, the voltage is controlled to be supplied to the charging voltage applying unit 304 to provide the charging voltage to the charging member 302 (such as t1) and when the voltage is supplied to the developing voltage applying unit 305 to provide the developing voltage to the developing member 303 (such as t2).

[0071] 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 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. 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 is as described above and will not be further described here. 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 302 and the time when the developing voltage applying unit 305 starts supplying voltage to the developing member 303. The time corresponding to the time difference between the start time of the charging voltage applying unit 304 supplying voltage to the charging member 302 and the start time of the developing voltage applying unit 305 supplying voltage to the developing member 303 is as described above and will not be repeated here.

[0072] In one embodiment, 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 jam occurs, the running speed of the driving unit 306 is V1, and 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 running of the driving unit 306 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 running of the driving unit 306 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).

[0073] In one embodiment, when the image forming apparatus 300 is in a paper jam state, the control unit 307 controls the supply of voltage 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 voltage supply unit 308 to supply the same voltage as the voltage value before the paper jam occurred in the image forming apparatus 300 to the developing voltage applying unit 305 or the control unit 307 controls the voltage supply unit 308 to supply a voltage value K1 different from the voltage value K before the paper jam occurred in the image forming apparatus 300 to the developing voltage applying unit 305, and the voltage value K1 ∈ [K - 50, K + 50].

[0074] In an image forming apparatus provided in an embodiment of the present application, a control unit controls the supply of voltage to a developing voltage applying unit, i.e., controls the supply of voltage to a developing member, when the image forming apparatus recovers from a paper jam. The supplied voltage value K1 is the same as the voltage value K before the paper jam, i.e., K1=K. Alternatively, the supplied voltage value K1 is within a predetermined range of the voltage value K before the paper jam, such as K1∈[K-50,K+50]. In this way, by controlling the voltage value after the paper jam to be not significantly different from the voltage 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 due to the electric field between the developing member and the image bearing member not meeting the normal development conditions, thereby preventing the carrier from being unnecessarily consumed and forming an undesirable developed image that contaminates the desired image.

[0075] An embodiment of the present application provides a control method for an image forming device, wherein the image forming device includes an image bearing member, a charging member, a developing member, and a driving unit; wherein the image bearing member is configured to rotate; the charging member is configured to charge the surface of the image bearing member by contacting the image bearing member; the developing member 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 image bearing member; the driving unit is configured to drive the image bearing member, the charging member, and the developing member to rotate; the method includes: adjusting the control timing of applying voltage to the charging member and the developing member according to the current state of the image forming device, and controlling the operating state of the driving unit to eliminate the charge of the corresponding charging member position and developing member position area on the image bearing member.

[0076] Specifically, in one embodiment, the control unit adjusts the control timing of applying voltage to the charging component and the developing component according to the current state of the image forming device, and controls the operating state of the driving unit, including: when the image forming device is in a paper jam state, the control unit controls the start of supplying voltage to the developing component, controls the stop of supplying voltage to the charging component, and controls the operation of the driving unit.

[0077] Among them, the image forming device also includes a charging voltage applying unit, a developing voltage applying unit and a voltage supply unit, the charging voltage applying unit is configured to apply a charging voltage to the charging component, the developing voltage applying unit is configured to apply a developing voltage to the developing component, and the voltage supply unit is configured to supply voltage to the charging voltage applying unit and the developing voltage applying unit; the method also includes: according to the current state of the image forming device, controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the operating state of the driving unit.

[0078] Specifically, 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, a voltage supply 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 voltage supply unit is configured to supply power to the charging voltage applying unit and the developing voltage applying unit; the motor is configured to drive the photosensitive drum, the charging roller and the developing roller to rotate, and the method includes: according to the current state of the image forming device, controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the state of the motor operation to eliminate the charge of the image bearing member corresponding to the charging member position and the developing member position area.

[0079] 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.

[0080] In one embodiment, when the image forming apparatus is in a paper jam state, the voltage supply to the developing voltage applying unit is controlled, and the voltage supply is stopped after a first predetermined time; the voltage supply to the charging voltage applying unit is controlled to stop; and the driving unit is controlled to operate and stop operating after a second predetermined time.

[0081] 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 voltage to the developing voltage applying unit, and stops the voltage supply at time t4 after a first predetermined time; controls the stop of the supply of voltage 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 area S of the photosensitive drum surface, it is consistent with the relevant description above and will not be repeated here.

[0082] 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.

[0083] In one embodiment, when the image forming apparatus returns to normal operation from a paper jam, the voltage supply unit is controlled to begin supplying voltage to the developing voltage applying unit. After a third predetermined time has passed since the voltage supply unit began supplying voltage to the developing voltage applying unit, the voltage supply unit is controlled to begin supplying voltage 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 this time is sufficient to eliminate residual charge in area S of the photosensitive drum surface, this is consistent with the previous description and will not be further elaborated upon.

[0084] Specifically, please refer to Figure 6 , is a schematic diagram of the timing of controlling a motor, a charging voltage, and a developing voltage provided in an embodiment of the present application. In the figure, when the image forming device recovers from a paper jam state (t3) to a normal state (t5), the control unit in the image forming device controls the supply of the developing voltage first, and controls the rotation of the motor, and after a third predetermined time, such as T1, at time t6, the charging voltage is supplied again.

[0085] In this way, for the charge remaining in the S area of ​​the photosensitive drum surface before a paper jam occurs in the image forming device, when it first passes through the developing part, compared with the existing technology that has not supplied the developing voltage at this time, since the developing voltage can be supplied in time, the developing roller can normally supply the developer to the photosensitive drum surface, and supply the colorant other than the carrier to the photosensitive drum surface. In this way, normal developing operations can be performed, and the S area of ​​the photosensitive drum surface will not be affected by the residual charge electric field when passing through the developing part, causing the electric field force to be much greater than the magnetic field force, causing the photosensitive drum surface to adsorb the carrier and form a developed image, polluting the actual image, and causing the carrier to be consumed unnecessarily due to the fact that the developing voltage is not turned on.

[0086] 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 voltage 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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 device, characterized in that include: 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 driving unit configured to drive the image bearing member, the charging member, and the developing member to rotate; A control unit configured to adjust a control timing for applying voltage to the charging member and the developing member, and to control an operating state of the driving unit, according to a current state of the image forming apparatus, so as to eliminate electric charge in an area on the image bearing member corresponding to a position between the charging member and the developing 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.

2. The device according to claim 1, characterized in that Also includes: 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 voltage supply unit configured to supply a voltage to the charging voltage applying unit and the developing voltage applying unit; The control unit is further configured to control a timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit and to control an operation state of the driving unit according to a current state of the image forming apparatus.

3. The device according to claim 2, characterized in that The control unit controls the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and controls the operating state of the driving unit, including: When the image forming apparatus is in a jam state, the control unit controls the development voltage applying unit to start supplying voltage, controls the charging voltage applying unit to stop supplying voltage, and controls the driving unit to operate.

4. The device according to claim 3, characterized in that The control unit controls the start of the voltage supply by the developing voltage applying unit, specifically comprising: the control unit controls the start of the voltage supply by the developing voltage applying unit, and controls the stop of the voltage supply by the developing voltage applying unit 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.

5. The device according to claim 2, characterized in that The control unit controls the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and controls the operating state of the driving unit, further comprising: When the image forming apparatus recovers from a jam state to a normal state, the control unit controls the start of the developing voltage applying unit supplying voltage, and controls the driving unit to operate, and controls the start of the charging voltage applying unit supplying voltage after a third predetermined time has passed since the start of the developing voltage applying unit supplying voltage.

6. The device according to claim 2, characterized in that The control unit controls the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and controls the operating state of the driving unit, further comprising: When the image forming device recovers to a normal state from a paper jam state, the control unit controls the driving unit to run in a direction opposite to the running direction of the image forming device before the paper jam occurs, and after the driving unit runs for a fourth predetermined time, controls the driving unit to run in the same direction as the running direction of the image forming device before the paper jam occurs, and controls the start of the voltage supply by the charging voltage applying unit.

7. The device according to claim 4, 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 a time that exceeds 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 does not exceed a time corresponding to a time difference between when the charging voltage applying unit starts supplying voltage to the charging member and when the developing voltage applying unit starts supplying voltage.

8. The device according to claim 5, 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.

9. The device according to claim 6, 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.

10. A method for controlling an image forming device, characterized in that: The image forming apparatus includes an image bearing member, a charging member, a developing member, and a driving unit; wherein the image bearing member is configured to rotate; 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 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 device, the control timing of applying voltage to the charging member and the developing member is adjusted, and the operating state of the driving unit is controlled to eliminate the charge of the area corresponding to the charging member position and the developing member position on the image bearing member; wherein the state of the image forming device includes a paper jam state and / or recovery from a paper jam state to a normal state.

11. The method according to claim 10, characterized in that The apparatus further includes 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, and a voltage supply unit configured to supply voltage to the charging voltage applying unit and the developing voltage applying unit; The method further comprises: According to the current state of the image forming apparatus, the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit is controlled, and the operation state of the driving unit is controlled.

12. The method according to claim 11, characterized in that The controlling of the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and the controlling of the operating state of the driving unit comprises: When the image forming device is in a paper jam state, the developing voltage applying unit is controlled to start supplying voltage, and after a first predetermined time, the developing voltage applying unit is controlled to stop supplying voltage; the charging voltage applying unit is controlled to stop supplying voltage; and the driving unit is controlled to operate, and after a second predetermined time, the driving unit is controlled to stop operating.

13. The method according to claim 11, characterized in that The controlling of the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and the controlling of the operating state of the driving unit further includes: When the image forming apparatus recovers from a jam state to a normal state, the developing voltage applying unit is controlled to start supplying voltage, and the operation of the driving unit is controlled, and after a third predetermined time has passed since the developing voltage applying unit started supplying voltage, the charging voltage applying unit is controlled to start supplying voltage.

14. The method according to claim 11, characterized in that The controlling of the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming apparatus, and the controlling of the operating state of the driving unit further includes: When the image forming device recovers to a normal state from a paper jam state, the driving unit is controlled to run in a direction opposite to the running direction of the image forming device 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 same as the running direction of the image forming device before the paper jam occurs, and the charging voltage applying unit is controlled to start supplying voltage.

15. 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 10 to 14 are implemented.

Images