Transfer printing cleaning device, control method and image forming equipment

Abstract

The embodiment of the invention provides a transfer printing cleaning device, a control method and image forming equipment, and the transfer printing cleaning device comprises a transfer printing part which is used for transferring a portrait on an image bearing body to a recording medium; the first cleaning part is arranged to be opposite to the transfer printing part; the first cleaning component and / or the transfer printing component receive a power supply of the voltage applying device, when the transfer printing cleaning device is in a first state, a first potential difference is formed between the first cleaning component and the transfer printing component, and carbon powder on the transfer printing component is transferred to the first cleaning component under the action of the first potential difference; and the second cleaning part is used for collecting the carbon powder on the first cleaning part. According to the embodiment of the invention, the cleanliness of the recording medium in the transfer printing process can be improved, and the cleaning function about transfer printing can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of image forming, and particularly to a transfer cleaning device, a control method, and an image forming apparatus. Background Art

[0002] An image forming apparatus is a device that forms an image on a recording medium (such as paper) through an imaging principle, including but not limited to printers, copiers, fax machines, scanners, and multifunction machines that integrate functions such as printing, copying, faxing, and scanning.

[0003] An image forming apparatus usually includes a transfer member that transfers a toner image on an image carrier to a recording medium (for example, paper). Generally, not too much toner is carried on the transfer member. However, in some application scenarios, due to the influence of other factors, the image on the image carrier may be transferred to the transfer member, causing a certain amount of toner to be carried on the transfer member. Therefore, during the transfer process, the toner on the transfer member will be transferred to the back of the recording medium, resulting in a certain degree of contamination on the back of the recording medium.

[0004] It should be noted that the information disclosed in the background art section of the present application is only intended to deepen the understanding of the general background art of the present application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The present application provides a transfer cleaning device, a control method, and an image forming apparatus to facilitate solving the problem that the back of a recording medium is contaminated by toner during the transfer process in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a transfer cleaning device, including: A transfer member configured to transfer an image on an image carrier to a recording medium; A first cleaning member arranged opposite to the transfer member; The first cleaning member and / or the transfer member receive power from a voltage application device. When the transfer cleaning device is in a first state, a first potential difference is formed between the first cleaning member and the transfer member, and the toner on the transfer member is transferred to the first cleaning member under the action of the first potential difference; A second cleaning member configured to collect the toner on the first cleaning member.

[0007] In a possible implementation, the first cleaning member and / or the transfer member receive power from a voltage application device. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning member and the transfer member, and the toner collected on the first cleaning member is transferred to the side of the transfer member under the action of the second potential difference, and the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member.

[0008] In a possible implementation, when the transfer cleaning device is in the first state, the transfer member arranged opposite to the first cleaning member and the imaging member are in an imaging state, and the first cleaning member is used to clean the toner on the surface of the transfer member.

[0009] In a possible implementation, when the transfer cleaning device is in the second state, the transfer member arranged opposite to the first cleaning member and the imaging member are in a non-imaging state, and the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member.

[0010] In a possible implementation, the second cleaning member includes a toner accommodating chamber, and the toner accommodating chamber is used to collect the toner on the first cleaning member.

[0011] In a possible implementation, transferring the toner collected on the first cleaning member to the second cleaning member through the transfer member includes: The potential difference between the transfer member and the image carrier satisfies: the toner on the first cleaning member can be transferred from the transfer member to the image carrier; the second cleaning member includes a cleaning blade opposite to the surface of the image carrier, and the cleaning blade collects the toner on the surface of the image carrier into the toner accommodating chamber inside the second cleaning member.

[0012] In a possible implementation, before the transfer cleaning device is in the first state, it includes: If the current printing mode is a borderless printing mode, the transfer cleaning device is started to be in the first state, and the first potential difference is controlled to be formed between the first cleaning member and the transfer member to meet the following conditions: the normally polarized toner on the transfer member can be transferred to the first cleaning member.

[0013] In a possible implementation, before the transfer cleaning device is in the first state, it further includes: If the current printing mode is not a borderless printing mode, the transfer cleaning device is started to be in the first state, and the first potential difference is controlled to be formed between the first cleaning member and the transfer member to meet the following relationship: the abnormally polarized toner on the transfer member can be transferred to the first cleaning member.

[0014] In a possible implementation, it further includes: The time point t1 when applying a cleaning voltage to the first cleaning member to form a first potential difference with the transfer member is earlier than the time point t2 when applying a transfer voltage to the transfer member, and t2 - t1 = Δt, where Δt ≥ S / V line ; where S is the arc length between the first tangent point and the second tangent point on the transfer member, and the second tangent point points to the first tangent point along the rotation direction of the transfer member, and V line is the linear velocity of the transfer member. The first tangent point is the tangent point between the transfer member and the image carrier, and the second tangent point is the tangent point between the transfer member and the first cleaning member.

[0015] In a possible implementation, the same voltage application device is used to apply power to the first cleaning member and / or the transfer member, so that the transfer cleaning device is in the first state or the second state.

[0016] In a possible implementation, it further includes: When it is detected that the toner transferred to the first cleaning member needs to be cleaned, the second cleaning member is started to collect the toner on the first cleaning member.

[0017] In a possible implementation, in at least one of the following ways, it is detected that the toner transferred to the first cleaning member needs to be cleaned: The accumulated actual number of printed dots is greater than or equal to a preset dot threshold; The accumulated actual number of printed pages is greater than or equal to a preset page threshold; The accumulated actual idle running distance of the drum motor is greater than or equal to a preset distance; The accumulated duration when the transfer cleaning device is in the first state is greater than or equal to a preset duration; Before starting the printing operation and / or after ending the printing operation.

[0018] In a possible implementation, when it is detected that the toner transferred to the first cleaning member needs to be cleaned, starting to use the second cleaning member to collect the toner on the first cleaning member includes: When performing a continuous K-page printing operation, between the time point when the transfer of the i-th page image is completed and the time point when the transfer of the (i + 1)-th page image starts, start using the second cleaning member to collect the toner on the first cleaning member.

[0019] In a possible implementation, when it is detected that the toner transferred to the first cleaning member needs to be cleaned, starting to use the second cleaning member to clean the toner on the first cleaning member includes: When performing a continuous K-page printing operation, if it is detected during the printing operation of the i-th page that the toner transferred to the first cleaning member needs to be cleaned, then between the time point when the transfer of the i-th page image is completed and the time point when the transfer of the (i + 1)-th page image starts, start cleaning the first cleaning member using the second cleaning member.

[0020] In a possible implementation, it further includes: Set at least one complete cleaning cycle T cycle , within the complete cleaning cycle T cycle , use the second cleaning member to collect the toner on the first cleaning member; Wherein, within the complete cleaning cycle T cycle , the distance that the first cleaning member rotates is greater than or equal to twice the circumference distance of the first cleaning member.

[0021] In a second aspect, an embodiment of the present application provides a control method for a transfer cleaning device, including using the transfer cleaning device of any item in the first aspect to perform the following steps: Control the voltage application device to apply power to the first cleaning member and / or the transfer member. When the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member and the transfer member, so that the toner on the transfer member is transferred to the first cleaning member under the action of the first potential difference; Use the second cleaning member to collect the toner on the first cleaning member.

[0022] In a possible implementation, it further includes: Control the voltage application device to apply power to the first cleaning member and / or the transfer member. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning member and the transfer member, so that the toner collected on the first cleaning member is transferred to the transfer member under the action of the second potential difference, and the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member.

[0023] In a third aspect, an embodiment of the present application provides an image forming device, including: the transfer cleaning device of any item in the first aspect.

[0024] The transfer cleaning device, control method, and image forming device provided by the present application have at least the following technical effects: In the present application, the first cleaning member is arranged opposite to the transfer member, and the first cleaning member and / or the transfer member receive power from a voltage application device. When the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member and the transfer member, so that the toner on the transfer member can be transferred to the first cleaning member. Further, a second cleaning member is included, which can be used to collect the toner on the first cleaning member. Furthermore, the transfer cleaning device, the control method, and the image forming apparatus according to the embodiments of the present application can clean the toner on the transfer member, thereby helping to reduce the situation where the toner on the transfer member soils the recording medium during printing and affects the use. At the same time, the first cleaning member can also be cleaned. Therefore, the cleaning method for transfer in the embodiments of the present application can improve the cleanliness of the recording medium during the transfer process and also help to improve the cleaning function for transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Structural schematic diagram of a monochromatic image forming apparatus provided by an embodiment of the present application; Figure 2 Structural schematic diagram of a color image forming apparatus provided by an embodiment of the present application; Figure 3A and 3B Structural schematic diagram of a transfer cleaning device provided by an embodiment of the present application; Figures 3C - 3J Schematic diagram of voltage configuration of a transfer roller and a first cleaning member provided by an embodiment of the present application; Figure 4A and 4B Structural schematic diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 5A and 5B Structural schematic diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 6A and 6B Structural schematic diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 7A and 7B Structural schematic diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 8A and 8BSchematic structural diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 9A and 9B Schematic structural diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 10A and 10B Schematic structural diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 11A and 11B Schematic structural diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 12A and 12B Schematic structural diagram of another transfer cleaning device provided by an embodiment of the present application; Figure 13A and 13B Schematic application scenario diagram of a monochrome image forming device provided by an embodiment of the present application; Figure 14A and 14B Schematic application scenario diagram of a color image forming device provided by an embodiment of the present application; Figure 15 Schematic process diagram of continuous printing cleaning provided by an embodiment of the present application; Figure 16 Schematic process diagram of cleaning before starting a printing operation provided by an embodiment of the present application; Figure 17 Schematic process diagram of a control method for a transfer cleaning device further provided by an embodiment of the present application; Figure 18 Schematic structural diagram of an image forming device further provided by an embodiment of the present application. Detailed implementation manners

[0027] For a better understanding of the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0028] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the", and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0031] An image forming apparatus is an apparatus that forms an image on a recording medium through an imaging principle, including but not limited to printers, copiers, fax machines, scanners, and multifunction machines that integrate functions such as printing, copying, faxing, and scanning. Specifically, the recording medium can be paper or sheet materials of other materials. For ease of understanding, paper is used as an example for illustration hereinafter.

[0032] According to the color of the toner used, the image forming apparatus can be classified into a monochromatic image forming apparatus and a color image forming apparatus.

[0033] Among them, a monochromatic image forming apparatus refers to an image forming apparatus that performs an image forming operation using only a single color toner. In practical applications, the "single color toner" is usually black toner. Of course, it may also be cyan, magenta, yellow, or other color toners, and the embodiments of the present application do not make specific limitations thereto. When the "single color toner" is black toner, the monochromatic image forming apparatus may also be referred to as a "black and white image forming apparatus".

[0034] A color image forming apparatus refers to an image forming apparatus that performs an image forming operation using a plurality of color toners. In practical applications, the "plurality of color toners" is usually cyan, magenta, yellow, and black toners. Of course, it may also be a combination of other color toners, and the embodiments of the present application do not make specific limitations thereto.

[0035] See Figure 1 , which is a schematic structural diagram of a monochromatic image forming apparatus provided by an embodiment of the present application. As Figure 1 shown, the monochromatic image forming apparatus 100 includes a laser scanning unit (LSU) 101, a photosensitive drum 102, a charging roller 103, a developing roller 104, a toner cartridge 105, a transfer roller 106, a heating roller 107, a pressure roller 108, a discharge roller 109, a discharge paper tray 110, etc. Generally speaking, the processing cartridge includes a photosensitive drum 102, a charging roller 103, a developing roller 104, and a toner cartridge 105 for containing toner.

[0036] The charging roller 103 is used to charge the surface of the photosensitive drum 102; the LSU 101 is used to emit a beam of light. Under the action of the beam of light, an electrostatic latent image is formed on the surface of the photosensitive drum 102; the developing roller 104 is used to develop a toner image on the surface of the photosensitive drum 102; the transfer roller 106 is used to transfer the toner image onto the paper P and convey the paper P carrying the toner image to the clamping area between the heating roller 107 and the pressure roller 108; the heating roller 107 and the pressure roller 108 are used to fix the toner image on the paper P and convey the fixed paper P to the discharge roller 109; the discharge roller 109 is used to discharge the paper P into the discharge paper tray 110 and stack it up.

[0037] It should be added that in the embodiment of the present application, the toner contained in the toner cartridge 105 can be black, cyan, magenta, yellow or other colors. In addition, the above-listed monochromatic image forming device 100 is only taken as an example, and the component composition and component settings of the monochromatic image forming device 100 can be adjusted according to the actual situation on the premise of not affecting the improvement idea of the present invention.

[0038] See Figure 2 , which is a schematic structural diagram of a color image forming device provided by an embodiment of the present application. As Figure 2 shown, the color image forming device 200 includes photosensitive drums 201C / M / Y / K, charging rollers 202C / M / Y / K, developing rollers 203C / M / Y / K, toner cartridges 204C / M / Y / K, transfer belt 205, primary transfer rollers 206C / M / Y / K, secondary transfer roller 207, paper feed cassette 208, paper feed rollers 209, conveying rollers 210, paper detection sensor 220, laser scanning unit (LSU) 211, heating roller 212, pressure roller 213, discharge roller 214 and discharge paper tray 215, etc. Generally speaking, the process cartridges C / M / Y / K respectively include photosensitive drums 201C / M / Y / K, charging rollers 202C / M / Y / K, developing rollers 203C / M / Y / K and toner cartridges 204C / M / Y / K for containing toner.

[0039] The LSU 211 is in the form of a single LSU and includes four light paths. Four charging rollers 202C / M / Y / K are used to charge the surfaces of the four photosensitive drums 201C / M / Y / K respectively; four light beams (not shown in the figure) are emitted from the four light paths of the LSU to form an electrostatic latent image on the surfaces of the photosensitive drums 201C / M / Y / K; four developing rollers 203C / M / Y / K are used to develop a toner image of one color on the surfaces of the photosensitive drums 201C / M / Y / K respectively; the color image forming apparatus 200 adopts a secondary transfer method, that is, the four photosensitive drums 201C / M / Y / K sequentially transfer the toner images to the transfer belt 205; then the color toner image formed on the transfer belt 205 is secondarily transferred to the paper P by the secondary transfer roller 207. The paper supply cassette 208 is used to store the paper P, and the paper feed roller 209 is used to convey the paper P to the conveyance path (i.e., the paper path channel described later). The conveyance roller 210 is used to convey the paper P to the secondary transfer roller 207.

[0040] The secondary transfer roller 207 conveys the imaged paper P to the clamping area of the heating roller 212 and the pressure roller 213. The heating roller 212 and the pressure roller 213 are used to fix the toner image on the paper P. The heating roller 212 and the pressure roller 213 convey the fixed paper P to the discharge roller 214, and the discharge roller 214 discharges the paper P to the discharge paper cassette 215 and stacks them up.

[0041] Among them, the laser scanning unit 211 obtains an optical analog image signal of the original document / source file through the exposure of the optical print head. The paper detection sensor 220 is used to detect whether there is paper P in the paper path channel at its location.

[0042] The paper supply cassette 208 is provided with a paper outlet. The paper feed roller 209 is specifically used to feed the paper P contained in the paper supply cassette 208 from the paper outlet into the paper path channel for transfer requirements. The color image forming apparatus 200 further includes a driving mechanism (not shown in the figure) for driving the paper feed roller 209 to work. The driving mechanism is a driving motor for driving the paper feed roller 209 to move to achieve the paper feeding operation. The driving mechanism is electrically connected to the controller (not shown in the figure) of the color image forming apparatus to realize the working control of the driving mechanism by the controller. The controller is electrically connected to the paper detection sensor 220, and the paper detection sensor 220 sends the detection result information of whether there is paper P on the paper path channel to the controller.

[0043] The color image forming apparatus 200 further includes an operation panel (not shown in the figure). The operation panel includes an operation part (not shown in the figure) composed of various keys and a touch panel type display part (not shown in the figure).

[0044] It should be noted that in the embodiments of the present application, C represents cyan, M represents magenta, Y represents yellow, and K represents black. In addition, the above-listed color image forming apparatus 200 is only an example, and the component composition and component settings of the color image forming apparatus 200 can be adjusted according to actual situations without affecting the improvement idea of the present invention.

[0045] For the sake of convenience of description, in the embodiments of the present application, the component in the image forming apparatus for carrying the toner image is referred to as an "image carrier". For example, Figure 1 the photosensitive drum 102 in the illustrated monochromatic image forming apparatus 100; Figure 2 the transfer belt 205 in the illustrated color image forming apparatus 200. The component in the image forming apparatus for transferring the toner image on the image carrier to the paper is referred to as a "transfer component". For example, Figure 1 the transfer roller 106 in the illustrated monochromatic image forming apparatus 100; Figure 2 the secondary transfer roller 207 in the illustrated color image forming apparatus 200.

[0046] Generally speaking, during the transfer process, since there is paper between the transfer component and the image carrier, the toner image on the image carrier usually will not be transferred to the transfer component, that is, the transfer component will not carry too much toner. However, in some application scenarios, due to the influence of other factors, some of the toner images on the image carrier may be transferred to the transfer component, causing the transfer component to carry a certain amount of toner. Further, the toner on the transfer component will be transferred to the back of the paper, resulting in a certain degree of contamination on the back of the paper.

[0047] For example, in the application scenario of borderless printing in the longitudinal direction, it is required that the head of the toner image be strictly aligned with the head of the paper. However, due to mechanical and electrical errors, there is a probability that the head of the toner image and the head of the paper have an error of 2 - 3 mm, resulting in some of the toner images in the longitudinal direction (the direction of paper transmission) being directly transferred to the transfer component, that is, the transfer component carries a certain amount of toner. When the toner on the transfer component rotates one week with the transfer component, the toner on the transfer component will stick to the back of the paper, resulting in a certain degree of contamination on the back of the paper.

[0048] Another example is in the application scenario of borderless printing in the horizontal direction, where it is required that the paper be centered and not tilted. However, during the paper transmission process, the paper may be tilted or not centered, resulting in some of the toner images on both sides of the paper being directly transferred to the transfer component, that is, the transfer component carries a certain amount of toner. When the toner on the transfer component rotates one week with the transfer component, the toner on the transfer component will stick to the back of the paper, resulting in a certain degree of contamination on the back of the paper.

[0049] In view of the above problems, an embodiment of the present application provides a transfer cleaning device, which includes a transfer member, a first cleaning member, and a second cleaning member. Among them, the transfer member is used to transfer the portrait on the image carrier to the recording medium; the first cleaning member is arranged opposite to the transfer member; the first cleaning member and / or the transfer member receive power from a voltage application device. When the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member and the transfer member, and the toner on the transfer member is transferred to the first cleaning member under the action of the first potential difference; the second cleaning member is used to collect the toner on the first cleaning member.

[0050] In an embodiment of the present application, when the transfer cleaning device is in the first state, the toner on the transfer member can be transferred to the first cleaning member under the action of the first potential difference, so that the toner on the transfer member can be cleaned, thereby helping to reduce the situation that the toner on the transfer member soils the paper during printing and affects the use. In addition, by collecting the toner on the first cleaning member through the second cleaning member, the cleaning effect of the first cleaning member can be further improved.

[0051] Therefore, in the transfer cleaning method of the embodiment of the present application, the cleanliness of the paper during the transfer process can be improved, and the cleaning function of the transfer can also be helped to be improved.

[0052] In a possible implementation manner, the first cleaning member and / or the transfer member receive power from a voltage application device. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning member and the transfer member, and the toner collected on the first cleaning member is transferred to the side of the transfer member under the action of the second potential difference, and the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member.

[0053] That is to say, in an embodiment of the present application, when it is necessary to collect the toner on the first cleaning member through the second cleaning member, first, the toner collected on the first cleaning member is transferred to the transfer member, and then transferred to the second cleaning member through the transfer member.

[0054] In specific implementation, there may be various implementation manners for "transferring the toner collected on the first cleaning member to the second cleaning member through the transfer member", which will be described separately below.

[0055] In a possible implementation manner, the second cleaning member is arranged at a position opposite to the image carrier, as shown in the following Figure 3A 、 3B, the implementation manners shown in FIGS. 8A and 8B. In the embodiments of the present application, the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member, specifically including: first, transferring the toner collected on the first cleaning member to the transfer member; second, transferring the toner on the transfer member to the image carrier; and finally, transferring the toner on the image carrier to the second cleaning member.

[0056] In a specific implementation, the potential difference between the transfer member and the image carrier satisfies: the toner on the first cleaning member can be transferred from the transfer member to the image carrier; the second cleaning member includes a cleaning blade opposite to the surface of the image carrier, and the cleaning blade collects the toner on the surface of the image carrier into the toner receiving chamber inside the second cleaning member.

[0057] In a possible implementation manner, the second cleaning member is disposed at a position opposite to the transfer member, as shown in Figure 4A , 4B , FIGS. 5A, 5B, 9A, 9B, 10A, and 10B. In the embodiments of the present application, the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member, specifically including: first, transferring the toner collected on the first cleaning member to the transfer member, and then transferring the toner on the transfer member to the second cleaning member.

[0058] In a possible implementation manner, two second cleaning members may also be provided. One second cleaning member is disposed at a position opposite to the image carrier, and the other second cleaning member is disposed at a position opposite to the transfer member. As shown in Figure 6A , 6B , FIGS. 11A and 11B. In the embodiments of the present application, the two second cleaning members can jointly collect the toner on the first cleaning member.

[0059] It should be added that, in some possible implementation manners, the second cleaning member may also be disposed at a position opposite to the first cleaning member, as shown in Figure 7A , 7B , FIGS. 12A and 12B. In the embodiments of the present application, the second cleaning member can directly collect the toner on the first cleaning member. That is to say, without passing through the transfer member, the toner on the first cleaning member can be directly transferred to the second cleaning member.

[0060] As described above, in different image forming apparatuses, the specific structures corresponding to the image carrier and the transfer member may be different. For example, in the Figure 1 shown monochromatic image forming apparatus 100, the image carrier is the "photosensitive drum 102", and the transfer member is the "transfer roller 106"; in the Figure 2In the color image forming apparatus 200 shown, the image carrier is the "transfer belt 205", and the transfer member is the "secondary transfer roller 207". For ease of understanding, the technical solutions provided by the embodiments of the present application will be described separately for the monochrome image forming apparatus 100 and the color image forming apparatus 200 below.

[0061] See Figure 3A and 3B , which is a schematic structural diagram of a transfer cleaning device provided by an embodiment of the present application. As shown in Figure 3A and 3B , the transfer cleaning device includes a transfer member 301, a first cleaning member 302, and a second cleaning member 303. In addition, for ease of description, an image carrier 304 and a developing roller 305 are also shown in Figure 3A and 3B . In the embodiment of the present application, the image carrier 304 is the photosensitive drum 102 in the monochrome image forming apparatus 100 shown in Figure 1 ; the transfer member 301 is the transfer roller 106 in the monochrome image forming apparatus 100 shown in Figure 1 .

[0062] During the process of the image forming apparatus performing an image forming operation, the toner in the developing roller 305 is successively transferred to the surface of the photosensitive drum 102, and a toner image is developed on the surface of the photosensitive drum 102; further, the transfer roller 106 transfers the toner image onto the paper P. Generally, during the transfer process, since there is a paper P between the transfer roller 106 and the photosensitive drum 102, therefore, the toner image on the photosensitive drum 102 usually does not transfer to the transfer roller 106, that is, the transfer roller 106 does not carry too much toner. However, in some application scenarios (for example, borderless printing), it may cause a part of the toner image on the photosensitive drum 102 to transfer to the transfer roller 106, so that the transfer roller 106 will carry a certain amount of toner. Further, the toner on the transfer roller 106 will transfer to the back surface of the paper P, resulting in a certain degree of contamination on the back surface of the paper P.

[0063] To avoid the contamination of the back surface of the paper P, the embodiment of the present application provides a first cleaning member 302 at a relative position of the transfer roller 106. When the transfer cleaning device is in the first state, the toner carried on the transfer roller 106 is cleaned by the first cleaning member 302, that is, the toner carried on the transfer roller 106 is transferred to the first cleaning member 302. For ease of description, in the embodiment of the present application, the state where the toner is transferred from the transfer roller 106 to the first cleaning member 302 is referred to as the "first state" of the transfer cleaning device, as shown in Figure 3A .

[0064] It is understandable that toner usually carries an electric charge (negative charge or positive charge). Therefore, by setting a corresponding potential difference between the first cleaning member 302 and the transfer roller 106, the transfer of toner from the transfer roller 106 to the first cleaning member 302 can be achieved. For the convenience of description, in the embodiments of the present application, the potential difference that satisfies this condition is referred to as the "first potential difference".

[0065] In a specific implementation, a voltage application device is provided in the image forming apparatus, and a corresponding power supply can be applied to the first cleaning member 302 and / or the transfer roller 106 through the voltage application device, so that the first potential difference is satisfied between the transfer roller 106 and the first cleaning member 302.

[0066] Generally speaking, in the embodiments of the present application, the first cleaning member 302 and / or the transfer roller 106 can receive the power supply of the voltage application device. When the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member 302 and the transfer roller 106, and the toner on the transfer roller 106 is transferred to the first cleaning member 302 under the action of the first potential difference.

[0067] Specifically, the potential difference is also called the electromotive force difference. The direction of the electric field is defined as the direction of the electric force received by the positive charge. The electric field lines point from the high electric potential to the low electric potential region, and the direction of the electric field lines is consistent with the direction of the electric field. Among them, the direction of the electric field is determined by the direction of the potential difference. When there is a potential difference △V = |V2 - V1|, regardless of whether the two are positive voltages or negative voltages, the direction of the electric field always points from the high electric potential end (high potential) to the low electric potential end (low potential). And the positive charge will move from the high electric potential to the low electric potential in the electric field, and the negative charge will move against the direction of the electric field in the electric field, that is, from the low electric potential to the high electric potential.

[0068] In a possible implementation manner, when the toner carries a negative charge, since the negative charge moves towards the direction of higher electric potential, a higher voltage (relative to the transfer roller 106) can be applied to the first cleaning member 302 to achieve the transfer of toner from the transfer roller 106 to the first cleaning member 302.

[0069] Combined with Figure 3C As shown, specifically, positive voltages can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the first cleaning member 302 is greater than the potential of the transfer roller 106. For example, a positive voltage V1 is applied to the transfer roller 106, and a positive voltage V2 is applied to the first cleaning member 302, and V2 is greater than V1. At this time, the first potential difference: △V = V2 - V1, and the direction of the electric field: from the first cleaning member 302 with high electric potential to the transfer roller 106 with low electric potential. Furthermore, the toner carrying a negative charge can be transferred from the transfer roller 106 to the first cleaning member 302.

[0070] Or, combined with Figure 3DAs shown, a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the first cleaning member 302 is greater than that of the transfer roller 106. For example, a negative voltage of V1 is applied to the transfer roller 106, and a negative voltage of V2 is applied to the first cleaning member 302, where |V2| < |V1|. At this time, the first potential difference: ΔV = |V2 - V1|, and the electric field direction: from the first cleaning member 302 with a higher potential to the transfer roller 106 with a lower potential. Thus, the toner carrying negative charges can be transferred from the transfer roller 106 to the first cleaning member 302.

[0071] That is to say, when the toner carries negative charges, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "first potential difference"; or a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "first potential difference".

[0072] In a possible implementation, when the toner carries positive charges, since the positive charges move in the direction of lower potential, a lower voltage (relative to the transfer roller 106) can be applied to the first cleaning member 302 to achieve the transfer of the toner from the transfer roller 106 to the first cleaning member 302.

[0073] Combined with Figure 3E As shown, specifically, a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the first cleaning member 302 is less than that of the transfer roller 106. For example, a negative voltage of V1 is applied to the transfer roller 106, and a negative voltage of V2 is applied to the first cleaning member 302, where |V2| > |V1|. At this time, the first potential difference: ΔV = |V2 - V1|, and the electric field direction: from the transfer roller 106 with a higher potential to the first cleaning member 302 with a lower potential. Thus, the toner carrying positive charges can be transferred from the transfer roller 106 to the first cleaning member 302.

[0074] Or, combined with Figure 3F As shown, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the first cleaning member 302 is less than that of the transfer roller 106. For example, a positive voltage of V1 is applied to the transfer roller 106, and a positive voltage of V2 is applied to the first cleaning member 302, where V2 < V1. At this time, the first potential difference: ΔV = V1 - V2, and the electric field direction: from the transfer roller 106 with a higher potential to the first cleaning member 302 with a lower potential. Thus, the toner carrying positive charges can be transferred from the transfer roller 106 to the first cleaning member 302.

[0075] That is to say, when the toner carries positive charges, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "first potential difference"; or a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "first potential difference".

[0076] Ideally, the toner carried on the transfer roller 106 has the same polarity of charge. However, in actual applications, there may be toner with a changed polarity. For the sake of convenience of description, in the embodiments of the present application, the toner with a polarity that meets the expectation is referred to as "toner with normal polarity"; the toner with a polarity that does not meet the expectation is referred to as "toner with abnormal polarity". Exemplarily, the toner with normal polarity carries a negative charge, and the toner with abnormal polarity carries a positive charge; or, the toner with normal polarity carries a positive charge, and the toner with abnormal polarity carries a negative charge. That is to say, there may be toner carrying a positive charge and toner carrying a negative charge on the transfer roller 106 at the same time.

[0077] Since negative charges move towards the direction of higher electric potential and positive charges move towards the direction of lower electric potential, therefore, when transferring toner with different polarities from the transfer roller 106 to the first cleaning member 302, the potential difference configured between the transfer roller 106 and the first cleaning member 302 is different. In order to transfer all the toner with two polarities on the transfer roller 106 to the first cleaning member 302, two potential states can be configured for the first potential difference. For the sake of convenience of description, these two potential states are respectively referred to as "first potential state" and "second potential state". In the first potential state, the toner with normal polarity on the transfer roller 106 is transferred to the first cleaning member 302; in the second potential state, the toner with abnormal polarity on the transfer roller 106 is transferred to the first cleaning member 302.

[0078] Exemplarily, the toner with normal polarity carries a negative charge; the toner with abnormal polarity carries a positive charge. In the first potential state, the potential of the first cleaning member 302 is greater than the potential of the transfer roller 106. At this time, the direction of the electric field is from the first cleaning member 302 with a higher electric potential to the transfer roller 106 with a lower electric potential (as shown in Figure 3C and 3D ). Therefore, the toner with normal polarity (toner carrying a negative charge) can be transferred from the transfer roller 106 to the first cleaning member 302. In the second potential state, the potential of the first cleaning member 302 is less than the potential of the transfer roller 106. At this time, the direction of the electric field is from the transfer roller 106 with a higher electric potential to the first cleaning member 302 with a lower electric potential (as shown in Figure 3E and 3F ). Therefore, the toner with abnormal polarity (toner carrying a positive charge) can be transferred from the transfer roller 106 to the first cleaning member 302.

[0079] Exemplarily, the toner with normal polarity carries a positive charge; the toner with abnormal polarity carries a negative charge. In the first potential state, the potential of the first cleaning member 302 is less than the potential of the transfer roller 106. At this time, the direction of the electric field is from the transfer roller 106 with a higher electric potential to the first cleaning member 302 with a lower electric potential (as shown in Figure 3E and3F (as shown). Therefore, toner with a normal polarity (positively charged toner) can be transferred from the transfer roller 106 to the first cleaning member 302. In the second potential state, the potential of the first cleaning member 302 is greater than that of the transfer roller 106. At this time, the direction of the electric field is from the first cleaning member 302 with a high potential to the transfer roller 106 with a low potential (as Figure 3C and 3D shown). Therefore, toner with an abnormal polarity (negatively charged toner) can be transferred from the transfer roller 106 to the first cleaning member 302.

[0080] Further analysis shows that since the first potential state and the second potential state are opposite, when transferring the toner with a normal polarity on the transfer roller 106 to the first cleaning member 302 in the first potential state, it is also possible to transfer the toner with an abnormal polarity on the first cleaning member 302 to the transfer roller 106; when transferring the toner with an abnormal polarity on the transfer roller 106 to the first cleaning member 302 in the second potential state, it is also possible to transfer the toner with a normal polarity on the first cleaning member 302 to the transfer roller 106.

[0081] To avoid this problem, before switching from the first potential state to the second potential state (transferring toner with a normal polarity first and then toner with an abnormal polarity), it is usually necessary to ensure that the toner with a normal polarity transferred to the first cleaning member 302 has been removed, so as to prevent the toner with a normal polarity on the first cleaning member 302 from being transferred to the transfer roller 106 again after switching to the second potential state. Or, before switching from the second potential state to the first potential state (transferring toner with an abnormal polarity first and then toner with a normal polarity), it is usually necessary to ensure that the toner with an abnormal polarity transferred to the first cleaning member 302 has been removed, so as to prevent the toner with an abnormal polarity on the first cleaning member 302 from being transferred to the transfer roller 106 again after switching to the first potential state.

[0082] It should be added that in practical applications, the proportion of toner with an abnormal polarity is usually small. Even if there is a small amount of toner with an abnormal polarity on the transfer roller 106, it will not cause too obvious contamination on the back of the paper P. Therefore, only the toner with a normal polarity on the transfer roller 106 can be transferred to the first cleaning member 302. In other words, the first potential difference only includes the first potential state.

[0083] In a possible implementation manner, the first cleaning member 302 is in a columnar structure, and the transfer roller 106 and the first cleaning member 302 are arranged in parallel (the axes of the transfer roller 106 and the first cleaning member 302 are parallel). In addition, the surface of the transfer roller 106 and the surface of the first cleaning member 302 can be tangent (in contact) or separated, and the embodiments of the present application do not make specific limitations on this.

[0084] Among them, the first cleaning member 302 rotates with the rotation of the transfer roller 106. Those skilled in the art can also configure a driving mechanism for the first cleaning member 302 when the surfaces of the transfer roller 106 and the first cleaning member 302 are tangent to each other, and drive the first cleaning member 302 to rotate through the driving mechanism. The embodiments of the present application do not make specific limitations on this.

[0085] When the surfaces of the transfer roller 106 and the first cleaning member 302 are separated from each other, it is usually necessary to configure a driving mechanism for the first cleaning member 302 to drive the first cleaning member 302 to rotate. However, when the surfaces of the transfer roller 106 and the first cleaning member 302 are separated from each other, the distance between the surfaces of the transfer roller 106 and the first cleaning member 302 should not be too large, so as to prevent the toner from being unable to be transferred from the transfer roller 106 to the first cleaning member 302 under the action of the first potential difference.

[0086] It should be added that those skilled in the art can also set the first cleaning member 302 to other structures or shapes according to actual needs, and the embodiments of the present application do not make specific limitations on this.

[0087] Furthermore, after the toner on the transfer roller 106 is transferred to the first cleaning member 302, it is also necessary to remove the toner on the first cleaning member 302. On the contrary, if the toner on the first cleaning member 302 is not removed, in some cases (for example, the potential of the transfer roller 106 and / or the first cleaning member 302 changes, or the toner on the first cleaning member 302 accumulates too much, resulting in insufficient cleaning of the transfer roller 106, etc.), it may still cause contamination on the back of the paper P. Therefore, the transfer cleaning device provided by the embodiments of the present application further includes a second cleaning member 303, and the second cleaning member 303 can collect the toner on the first cleaning member 302.

[0088] Specifically, the first cleaning member 302 and / or the transfer roller 106 can receive power from a voltage application device. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning member 302 and the transfer roller 106, and the toner collected on the first cleaning member 302 is transferred to the side of the transfer roller 106 under the action of the second potential difference, and the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the transfer roller 106.

[0089] In the embodiment of the present application, when the transfer cleaning device is in the second state, the toner on the first cleaning member 302 can be transferred to the transfer roller 106 under the action of the second potential difference, and further transferred to the second cleaning member 303 through the transfer roller 106, and the toner on the first cleaning member 302 can be collected by the second cleaning member 303. For ease of understanding, the following will be described in detail with specific embodiments.

[0090] Please continue to refer to Figure 3A and Figure 3B , in the embodiment of the present application, the second cleaning member 303 is disposed at a position opposite to the photosensitive drum 102. The relative position relationship between the second cleaning member 303 and the photosensitive drum 102 is configured such that when the photosensitive drum 102 rotates relative to the second cleaning member 303, the second cleaning member 303 can collect the toner on the surface of the photosensitive drum 102. That is to say, the second cleaning member 303 can directly collect the toner on the surface of the photosensitive drum 102.

[0091] Specifically, the second cleaning member 303 includes a cleaning blade 3031 opposite to the surface of the photosensitive drum 102 and a toner receiving chamber 3032. When the photosensitive drum 102 rotates relative to the second cleaning member 303, the cleaning blade 3031 on the second cleaning member 303 can scrape the toner on the surface of the photosensitive drum 102 and collect the scraped toner in the toner receiving chamber 3032 of the second cleaning member 303. Of course, those skilled in the art can also set the second cleaning member 303 to other structures according to actual needs. For example, the second cleaning member 303 is prepared from a material having a toner adsorption function, and the toner is collected by adsorption of the toner.

[0092] In the embodiment of the present application, since the second cleaning member 303 can directly collect the toner on the surface of the photosensitive drum 102, when it is necessary to collect the toner on the first cleaning member 302 by the second cleaning member 303, it is necessary to transfer the toner on the first cleaning member 302 to the photosensitive drum 102. Specifically, first, the toner on the first cleaning member 302 is transferred to the transfer roller 106; then, the toner on the transfer roller 106 is transferred to the photosensitive drum 102. For ease of description, in the embodiment of the present application, the state in which the toner is transferred from the first cleaning member 302 to the transfer roller 106 is referred to as the "second state" of the transfer cleaning device, as Figure 3B shown.

[0093] As described above, the toner usually carries an electric charge (negative charge or positive charge). Therefore, by setting a corresponding potential difference between the first cleaning member 302 and the transfer roller 106, the toner can be transferred from the first cleaning member 302 to the transfer roller 106. For ease of description, in the embodiment of the present application, the potential difference that satisfies this condition is referred to as the "second potential difference".

[0094] In a specific implementation, a voltage application device is provided in the image forming apparatus, and a corresponding power supply can be applied to the transfer roller 106 and / or the first cleaning member 302 through the voltage application device, so that a second potential difference is satisfied between the transfer roller 106 and the first cleaning member 302.

[0095] In a possible implementation manner, when the toner carries a negative charge, since the negative charge moves in the direction of higher electric potential, therefore, a higher potential (relative to the first cleaning member 302) can be applied to the transfer roller 106 to achieve the transfer of the toner from the first cleaning member 302 to the transfer roller 106.

[0096] Combined with Figure 3G As shown, specifically, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the transfer roller 106 is greater than the potential of the first cleaning member 302. For example, a positive voltage of V3 is applied to the transfer roller 106, and a positive voltage of V4 is applied to the first cleaning member 302, where V3 > V4. At this time, the second potential difference: ΔV = V3 - V4, and the electric field direction: from the transfer roller 106 with higher electric potential to the first cleaning member 302 with lower electric potential, and thus the toner carrying negative charge can be transferred from the first cleaning member 302 to the transfer roller 106.

[0097] Or, combined with Figure 3H As shown, a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the transfer roller 106 is greater than the potential of the first cleaning member 302. For example, a negative voltage of V3 is applied to the transfer roller 106, and a negative voltage of V4 is applied to the first cleaning member 302, where |V3| < |V4|. At this time, the second potential difference: ΔV = |V3 - V4|, and the electric field direction: from the transfer roller 106 with higher electric potential to the first cleaning member 302 with lower electric potential, and thus the toner carrying negative charge is transferred from the first cleaning member 302 to the transfer roller 106.

[0098] That is to say, when the toner carries a negative charge, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "second potential difference"; or a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "second potential difference".

[0099] In a possible implementation manner, when the toner carries a positive charge, since the positive charge moves in the direction of lower electric potential, therefore, a lower voltage (relative to the first cleaning member 302) can be applied to the transfer roller 106 to achieve the transfer of the toner from the first cleaning member 302 to the transfer roller 106.

[0100] Combined with Figure 3IAs shown, specifically, a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the transfer roller 106 is less than that of the first cleaning member 302. For example, a negative voltage of V3 is applied to the transfer roller 106, and a negative voltage of V4 is applied to the first cleaning member 302, where |V3| > |V4|. At this time, the second potential difference: ΔV = |V4 - V3|, and the electric field direction is from the first cleaning member 302 with a higher potential to the transfer roller 106 with a lower potential. Thus, the toner carrying positive charges can be transferred from the first cleaning member 302 to the transfer roller 106.

[0101] Or, in combination with Figure 3J As shown, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 respectively, and the potential of the transfer roller 106 is less than that of the first cleaning member 302. For example, a positive voltage of V3 is applied to the transfer roller 106, and a positive voltage of V4 is applied to the first cleaning member 302, where V3 < V4. At this time, the second potential difference: ΔV = V4 - V3, and the electric field direction is from the first cleaning member 302 with a higher potential to the transfer roller 106 with a lower potential. Thus, the toner carrying positive charges can be transferred from the first cleaning member 302 to the transfer roller 106.

[0102] That is to say, when the toner carries positive charges, a positive voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "second potential difference"; or a negative voltage can be applied to the transfer roller 106 and the first cleaning member 302 to satisfy the "second potential difference".

[0103] In a possible implementation, a corresponding power supply can be applied to the transfer roller 106 and / or the first cleaning member 302 through the same voltage application device, so that the transfer cleaning device is in the first state or the second state. It can be understood that realizing the first state and the second state through the same voltage application device can save the number and layout of the voltage application devices. While enabling the toner to be transferred to the expected object, it also makes the structure of the image forming device simpler and the hardware cost lower.

[0104] Ideally, the polarities of the charges carried by the toner on the first cleaning member 302 are the same. However, in practical applications, there may be toner with a changed polarity. That is to say, there may be toner carrying positive charges and toner carrying negative charges on the first cleaning member 302 at the same time.

[0105] Since negative charges move towards higher potential and positive charges move towards lower potential, when toner of different polarities is transferred from the first cleaning member 302 to the transfer roller 106, the potential difference configured between the transfer roller 106 and the first cleaning member 302 is different. To transfer all the toner of the two polarities on the first cleaning member 302 to the transfer roller 106, two potential states can be configured for the second potential difference. For ease of explanation, these two potential states are respectively referred to as the "third potential state" and the "fourth potential state". In the third potential state, the toner of the normal polarity on the first cleaning member 302 is transferred to the transfer roller 106; in the fourth potential state, the toner of the abnormal polarity on the first cleaning member 302 is transferred to the transfer roller 106.

[0106] Exemplarily, the toner of the normal polarity carries negative charges; the toner of the abnormal polarity carries positive charges. In the third potential state, the potential of the transfer roller 106 is greater than that of the first cleaning member 302. At this time, the direction of the electric field is from the transfer roller 106 with higher potential to the first cleaning member 302 with lower potential (as shown in Figure 3G and 3H ). Therefore, the toner of the normal polarity (the toner carrying negative charges) can be transferred from the first cleaning member 302 to the transfer roller 106. In the fourth potential state, the potential of the transfer roller 106 is less than that of the first cleaning member 302. At this time, the direction of the electric field is from the first cleaning member 302 with higher potential to the transfer roller 106 with lower potential (as shown in Figure 3I and 3J ). Therefore, the toner of the abnormal polarity (the toner carrying positive charges) can be transferred from the first cleaning member 302 to the transfer roller 106.

[0107] Exemplarily, the toner of the normal polarity carries positive charges; the toner of the abnormal polarity carries negative charges. In the third potential state, the potential of the transfer roller 106 is less than that of the first cleaning member 302. At this time, the direction of the electric field is from the first cleaning member 302 with higher potential to the transfer roller 106 with lower potential (as shown in Figure 3I and 3J ). Therefore, the toner of the normal polarity (the toner carrying positive charges) can be transferred from the first cleaning member 302 to the transfer roller 106. In the fourth potential state, the potential of the transfer roller 106 is greater than that of the first cleaning member 302. At this time, the direction of the electric field is from the transfer roller 106 with higher potential to the first cleaning member 302 with lower potential (as shown in Figure 3G and 3H ). Therefore, the toner of the abnormal polarity (the toner carrying negative charges) can be transferred from the first cleaning member 302 to the transfer roller 106.

[0108] Upon further analysis, since the third potential state and the fourth potential state are opposite, therefore, in the third potential state, while transferring the toner with the normal polarity on the first cleaning member 302 to the transfer roller 106, it is also possible to transfer the toner with the abnormal polarity on the transfer roller 106 to the first cleaning member 302; in the fourth potential state, while transferring the toner with the abnormal polarity on the first cleaning member 302 to the transfer roller 106, it is also possible to transfer the toner with the normal polarity on the transfer roller 106 to the first cleaning member 302.

[0109] To avoid this problem, before switching from the third potential state to the fourth potential state (transferring the toner with the normal polarity first and then the toner with the abnormal polarity), it is usually necessary to ensure that the toner with the normal polarity transferred to the transfer roller 106 has been removed, so as to prevent the toner with the normal polarity on the transfer roller 106 from being transferred to the first cleaning member 302 again after switching to the fourth potential state. Or, before switching from the fourth potential state to the third potential state (transferring the toner with the abnormal polarity first and then the toner with the normal polarity), it is usually necessary to ensure that the toner with the abnormal polarity transferred to the transfer roller 106 has been removed, so as to prevent the toner with the abnormal polarity on the transfer roller 106 from being transferred to the first cleaning member 302 again after switching to the third potential state.

[0110] It should be added that in practical applications, the proportion of the toner with the abnormal polarity is usually small, and even if the first cleaning member 302 carries a small amount of the toner with the abnormal polarity, it will not have too much impact on the contamination on the back of the paper P. Therefore, only the toner with the normal polarity on the first cleaning member 302 can be transferred to the transfer roller 106. In other words, the second potential difference only includes the third potential state.

[0111] Furthermore, after transferring the toner on the first cleaning member 302 to the transfer roller 106, it is also necessary to transfer the toner on the transfer roller 106 to the photosensitive drum 102. In a specific implementation, the potential difference between the transfer roller 106 and the photosensitive drum 102 satisfies that the toner on the first cleaning member 302 can be transferred from the transfer roller 106 to the photosensitive drum 102. It can be understood that after transferring the toner on the first cleaning member 302 from the transfer roller 106 to the photosensitive drum 102, the cleaning blade 3031 of the second cleaning member 303 can collect the toner on the surface of the photosensitive drum 102 into the toner containing chamber 3032 inside the second cleaning member 303. Regarding the setting method and working principle of the potential difference between the photosensitive drum 102 and the transfer roller 106, reference can be made to the descriptions of the first potential difference and the second potential difference in the above text. For the sake of brevity, it will not be elaborated here.

[0112] Please continue to refer to Figure 3A, when the transfer cleaning device is in the first state, the first cleaning member 302 is used to clean the toner on the surface of the transfer roller 106. That is, at this time, the image forming apparatus is in an imaging state, that is, the image forming apparatus is in a state of transferring the toner image on the photosensitive drum 102 to the paper P. It can be understood that when the image forming apparatus is in the imaging state, controlling the transfer cleaning device to work in the first state can timely remove the toner on the surface of the transfer roller 106, and prevent the toner on the surface of the transfer roller 106 from reaching the back side of the paper P after rotating one week, resulting in contamination of the back side of the paper P.

[0113] Of course, those skilled in the art can also control the transfer cleaning device to work in the first state when the image forming apparatus is in a non-imaging state, and clean the residual toner on the surface of the transfer roller 106 through the first cleaning member 302. The embodiments of the present application do not make specific limitations on this.

[0114] Please continue to refer to Figure 3B , when the transfer cleaning device is in the second state, the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the transfer roller 106 and the photosensitive drum 102. At this time, the image forming apparatus is in a non-imaging state.

[0115] It can be understood that in the embodiments of the present application, when the image forming apparatus is in the imaging state, due to the presence of the paper P gap between the photosensitive drum 102 and the transfer roller 106, the toner on the transfer roller 106 cannot be transferred to the photosensitive drum 102. From another perspective, when the image forming apparatus is in the imaging state, if the transfer cleaning device is controlled to work in the second state, the toner on the first cleaning member 302 will be directly transferred to the back side of the paper P through the transfer roller 106, resulting in contamination of the back side of the paper P. Therefore, in the embodiments of the present application, the transfer cleaning device can only be controlled to work in the second state when the image forming apparatus is in a non-imaging state.

[0116] It should be added that in other parts of this article, "the image forming apparatus is in the imaging state" may also be expressed as: the transfer member 301 arranged opposite to the first cleaning member 302 and the imaging member are in the imaging state. "The image forming apparatus is in the non-imaging state" may also be expressed as: the transfer member 301 arranged opposite to the first cleaning member 302 and the imaging member are in the non-imaging state. In the embodiments of the present application, the transfer member may be the transfer roller 106, and the imaging member may be the developing roller 305, the photosensitive drum 102, etc.

[0117] In addition, during the process of performing consecutive image forming operations on multiple pages, there will be a certain interval between the sheets P corresponding to two adjacent pages in the paper path channel, that is, there will be a certain interval between the head of the sheet P corresponding to the previous page and the tail of the sheet P corresponding to the next page. This interval can also be referred to as the "paper interval". In the embodiments of the present application, when the paper interval is located at the position corresponding to the transfer member 301, the image forming apparatus is in a non-imaging state.

[0118] Please continue to refer to Figure 3A , ideally, during the transfer process, all the toner images on the surface of the photosensitive drum 102 will be transferred, that is, the toner images will be transferred to the sheet P or the transfer roller 106. However, in practical applications, there may be untransferred toner (i.e., non-transferred toner) in the toner images on the surface of the photosensitive drum 102. It can be understood that if the non-transferred toner is not removed, the non-transferred toner continues to adsorb on the surface of the photosensitive drum 102, which will interfere with the subsequent toner images. Therefore, in the embodiments of the present application, the second cleaning member 303 is disposed at a position opposite to the photosensitive drum 102, and can also play a role in removing the non-transferred toner. In other words, in the embodiments of the present application, the second cleaning member 303 can, on the one hand, collect the toner on the first cleaning member 302; on the other hand, it can remove the non-transferred toner on the surface of the photosensitive drum 102, realizing the reuse of the second cleaning member 303.

[0119] It should be added that Figure 3A and 3B the rotation directions of the developing roller 305, the photosensitive drum 102, the transfer roller 106, the first cleaning member 302, and the sheet P transmission direction shown in

[0120] are only for an exemplary illustration, and the embodiments of the present application do not make specific limitations thereto. Figure 4A and 4B Refer to Figure 4A and 4B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiments of the present application. As shown in Figure 3A and 3B , the difference between the embodiments of the present application and the embodiments shown in

[0121] In the embodiment of the present application, since the second cleaning member 303 can directly clean the toner on the surface of the transfer roller 106, when it is necessary to clean the toner on the first cleaning member 302 by the second cleaning member 303, it is only necessary to transfer the toner on the first cleaning member 302 to the transfer roller 106, and there is no need to further transfer the toner on the transfer roller 106 to the photosensitive drum 102.

[0122] Please continue to refer to Figure 4A , when the transfer cleaning device is in the first state, the first cleaning member 302 is used to clean the toner on the surface of the transfer roller 106. At the same time, the second cleaning member 303 can also collect the toner on the surface of the transfer roller 106. That is to say, in the embodiment of the present application, when the transfer cleaning device is in the first state, the first cleaning member 302 and the second cleaning member 303 can jointly remove the toner on the surface of the transfer roller 106, thereby improving the cleaning effect of the toner on the surface of the transfer roller 106.

[0123] It can be understood that when the transfer cleaning device is in the first state, the cleaning order of the first cleaning member 302 and the second cleaning member 303 for the toner on the surface of the transfer roller 106 is related to "the relative positional relationship between the photosensitive drum 102, the transfer roller 106, the first cleaning member 302 and the second cleaning member 303 and the rotation direction of the transfer roller 106". For the convenience of description, in the embodiment of the present application, the tangent point between the transfer roller 106 and the photosensitive drum 102 is called "the first tangent point A", and the tangent point between the transfer roller 106 and the first cleaning member 302 is called "the second tangent point B".

[0124] In the embodiment of the present application, along the rotation direction of the transfer roller 106, the first tangent point A is located on the downstream side of the second tangent point B, and the second cleaning member 303 is located on the downstream side of the first tangent point A. According to this positional relationship, after a part of the toner image on the photosensitive drum 102 is transferred to the position of the first tangent point A of the transfer roller 106, as the transfer roller 106 rotates, the toner carried on the transfer roller 106 will first reach the position corresponding to the second cleaning member 303, and the second cleaning member 303 can clean the toner on the surface of the transfer roller 106. If the second cleaning member 303 cannot completely clean the toner on the surface of the transfer roller 106 (there is residual toner), as the transfer roller 106 rotates, the residual toner on the transfer roller 106 will reach the position of the second tangent point B, and the first cleaning member 302 can further clean the residual toner on the transfer roller 106, thereby improving the cleaning effect of the toner on the surface of the transfer roller 106.

[0125] Please continue to refer to Figure 4A, when the transfer cleaning device is in the first state, the image forming apparatus is in the imaging state. It can be understood that when the image forming apparatus is in the imaging state, controlling the transfer cleaning device to operate in the first state can remove the toner on the surface of the transfer roller 106 by the first cleaning member 302 and the second cleaning member 303 together, improving the cleaning effect of the toner on the surface of the transfer roller 106, and preventing the toner on the surface of the transfer roller 106 from reaching the position on the back surface of the paper P after rotating one week, resulting in contamination of the back surface of the paper P.

[0126] Of course, those skilled in the art can also control the transfer cleaning device to operate in the first state when the image forming apparatus is in the non-imaging state according to actual needs, and remove the residual toner on the surface of the transfer roller 106 by the first cleaning member 302 and the second cleaning member 303 together. The embodiments of the present application do not make specific limitations on this.

[0127] Please continue to refer to Figure 4B , when the transfer cleaning device is in the second state, the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the transfer roller 106. At this time, the image forming apparatus is in the non-imaging state.

[0128] In the embodiment of the present application, along the rotation direction of the transfer roller 106, the first tangent point A is located on the downstream side of the second tangent point B, and the second cleaning member 303 is located on the downstream side of the first tangent point A. According to this positional relationship, when the toner collected on the first cleaning member 302 is transferred to the second tangent point B position of the transfer roller 106, as the transfer roller 106 rotates, it will first reach the first tangent point A position and then reach the second cleaning member 303 position.

[0129] It can be understood that if the image forming apparatus is in the imaging state, the toner on the surface of the transfer roller 106 first reaches the first tangent point A position, which will cause the toner to be directly transferred to the back surface of the paper P, resulting in contamination of the back surface of the paper P. Therefore, in the embodiment of the present application, the transfer cleaning device can only be controlled to operate in the second state when the image forming apparatus is in the non-imaging state.

[0130] It should be added that for other content involved in the embodiments of the present application, reference can be made to Figure 3A and Figure 3B the description of the embodiments shown. For the sake of brevity, it will not be repeated here.

[0131] Refer to Figure 5A and 5B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiment of the present application. As shown in Figure 5A and 5B shown, the embodiment of the present application and Figure 4A and 4BThe difference of the illustrated embodiment is that, in the embodiment of the present application, along the rotation direction of the transfer roller 106, the second tangent point B is located on the downstream side of the first tangent point A, and the second cleaning member 303 is located on the downstream side of the second tangent point B.

[0132] As Figure 5A shown, when the transfer cleaning device is in the first state, according to the above position relationship of the first tangent point A, the second tangent point B and the second cleaning member 303, after a part of the toner image on the photosensitive drum 102 is transferred to the position of the first tangent point A of the transfer roller 106, as the transfer roller 106 rotates, the toner carried on the transfer roller 106 will first reach the position of the second tangent point B. The first cleaning member 302 can remove the toner on the surface of the transfer roller 106. If the first cleaning member 302 cannot completely remove the toner on the surface of the transfer roller 106 (there is residual toner), as the transfer roller 106 rotates, the residual toner on the transfer roller 106 will reach the position of the second cleaning member 303, and the second cleaning member 303 can further remove the residual toner on the transfer roller 106, thereby improving the cleaning effect of the toner on the surface of the transfer roller 106.

[0133] Please continue to refer to Figure 5A , when the transfer cleaning device is in the first state, the image forming apparatus is in the imaging state. It can be understood that when the image forming apparatus is in the imaging state, controlling the transfer cleaning device to operate in the first state can remove the toner on the surface of the transfer roller 106 by the first cleaning member 302 and the second cleaning member 303 together, improve the cleaning effect of the toner on the surface of the transfer roller 106, and prevent the toner on the surface of the transfer roller 106 from reaching the position on the back of the paper P after rotating one week, causing contamination on the back of the paper P.

[0134] Of course, those skilled in the art can also control the transfer cleaning device to operate in the first state when the image forming apparatus is in the non-imaging state, and remove the toner on the surface of the transfer roller 106 by the first cleaning member 302 and the second cleaning member 303 together. The embodiment of the present application does not make specific limitations on this.

[0135] Please continue to refer to Figure 5B , when the transfer cleaning device is in the second state, the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the transfer roller 106. At this time, the image forming apparatus is in the non-imaging state.

[0136] In the embodiment of the present application, along the rotation direction of the transfer roller 106, the second tangent point B is located on the downstream side of the first tangent point A, and the second cleaning member 303 is located on the downstream side of the second tangent point B. According to this positional relationship, when the toner collected on the first cleaning member 302 is transferred to the position of the second tangent point B of the transfer roller 106, as the transfer roller 106 rotates, it will first reach the position of the second cleaning member 303 and be removed by the second cleaning member 303.

[0137] It can be understood that if the image forming apparatus is in the imaging state, the toner on the surface of the transfer roller 106 first reaches the position of the second cleaning member 303 and is removed by the second cleaning member 303. Even if a small amount of residual toner reaches the position of the first tangent point A as the transfer roller 106 rotates, it will not cause too serious contamination to the back surface of the paper P. Therefore, in the embodiment of the present application, the transfer cleaning device can be controlled to operate in the second state when the image forming apparatus is in the non-imaging state, and can also be controlled to operate in the second state when the image forming apparatus is in the imaging state.

[0138] It should be added that for other content involved in the embodiment of the present application, reference can be made to Figure 4A and Figure 4B the description of the embodiments shown. For the sake of brevity, it will not be repeated here.

[0139] Refer to Figure 6A and 6B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiment of the present application. As shown in Figure 6A and 6B , the difference between the embodiment of the present application and the embodiments shown in Figure 3A and 3B is that in addition to setting the second cleaning member 303 at a position opposite to the photosensitive drum 102, the second cleaning member 303 is also set at a position opposite to the transfer roller 106; the difference between the embodiment of the present application and the embodiments shown in Figure 4A and 4B is that in addition to setting the second cleaning member 303 at a position opposite to the transfer roller 106, the second cleaning member 303 is also set at a position opposite to the photosensitive drum 102.

[0140] That is to say, two second cleaning members 303 are provided in the embodiment of the present application. By using the two second cleaning members 303 to clean the toner on the first cleaning member 302, the cleaning effect of the toner can be improved.

[0141] For example, in Figure 6BIn this case, when the transfer cleaning device is in the second state, after the toner collected on the first cleaning member 302 is transferred to the second tangent point B of the transfer roller 106, it reaches the first tangent point A as the transfer roller 106 rotates. At the first tangent point A, the toner can be transferred from the transfer roller 106 to the photosensitive drum 102, and then is removed by the second cleaning member 303 disposed at a position opposite to the photosensitive drum 102. In addition, at the first tangent point A, there may be some residual toner that is not transferred to the photosensitive drum 102. The residual toner continues to rotate with the transfer roller 106 and reaches the position of the second cleaning member 303, and then is removed by the second cleaning member 303. Therefore, by providing two second cleaning members 303, the cleaning effect of the toner can be improved.

[0142] It should be added that for other contents involved in the embodiments of the present application, reference can be made to the descriptions of the above embodiments. For the sake of brevity, they will not be repeated here.

[0143] See Figure 7A and 7B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiments of the present application. As Figure 7A and 7B shown, the difference between the embodiments of the present application and the embodiments shown in Figure 3A and 3B is that the second cleaning member 303 is disposed at a position opposite to the first cleaning member 302, and the second cleaning member 303 can directly collect the toner on the surface of the first cleaning member 302.

[0144] It can be understood that since the second cleaning member 303 can directly collect the toner on the surface of the first cleaning member 302, it is not necessary to transfer the toner collected on the first cleaning member 302 to the transfer roller 106. That is to say, in the embodiments of the present application, it is only necessary to control the transfer cleaning device to work in the first state, and it is not necessary to control the transfer cleaning device to work in the second state.

[0145] Furthermore, in the embodiments of the present application, since the second cleaning member 303 can directly remove the toner on the surface of the first cleaning member 302, therefore, regardless of whether the image forming apparatus is in an imaging state (as Figure 7A shown) or a non-imaging state (as Figure 7B shown), it is possible to control the transfer cleaning device to work in the first state, and the toner on the transfer roller 106 is collected by the first cleaning member 302. Further, the toner on the first cleaning member 302 is collected by the second cleaning member 303.

[0146] It should be added that for other contents involved in the embodiments of the present application, reference can be made to the descriptions of the above embodiments. For the sake of brevity, they will not be repeated here.

[0147] See Figure 8A and 8B , which is a schematic structural diagram of another transfer cleaning device provided by an embodiment of the present application. As shown in Figure 8A and 8B , the transfer cleaning device includes a transfer member 301, a first cleaning member 302, and a second cleaning member 303. In addition, for the convenience of description, an image carrier 304 is also shown in Figure 8A and 8B . In the embodiment of the present application, the image carrier 304 is the transfer belt 205 in the color image forming device 200 shown in Figure 2 ; the transfer member 301 is the secondary transfer roller 207 in the color image forming device 200 shown in Figure 2 .

[0148] During the process of the image forming device performing an image forming operation, the secondary transfer roller 207 transfers the toner image on the transfer belt 205 to the paper P. Generally speaking, during the transfer process, since there is paper P between the secondary transfer roller 207 and the transfer belt 205, therefore, the toner image on the transfer belt 205 usually does not transfer to the secondary transfer roller 207, that is, the secondary transfer roller 207 does not carry too much toner. However, in some application scenarios (for example, borderless printing), it may cause some toner images on the transfer belt 205 to transfer to the secondary transfer roller 207, so that the secondary transfer roller 207 will carry a certain amount of toner. Further, the toner on the secondary transfer roller 207 will transfer to the back of the paper P, resulting in a certain degree of contamination on the back of the paper P.

[0149] To avoid the contamination on the back of the paper P, the embodiment of the present application sets the first cleaning member 302 at the relative position of the secondary transfer roller 207. When the transfer cleaning device is in the first state, the toner carried on the secondary transfer roller 207 is cleaned by the first cleaning member 302, that is, the toner carried on the secondary transfer roller 207 is transferred to the first cleaning member 302. For the convenience of description, in the embodiment of the present application, the state where the toner is transferred from the secondary transfer roller 207 to the first cleaning member 302 is called the "first state" of the transfer cleaning device, as shown in Figure 8A .

[0150] It can be understood that toner usually carries charges (negative charges or positive charges). Therefore, by setting a corresponding potential difference between the first cleaning member 302 and the secondary transfer roller 207, the transfer of toner from the secondary transfer roller 207 to the first cleaning member 302 can be achieved. For the convenience of description, in the embodiment of the present application, the potential difference that satisfies this condition is called the "first potential difference".

[0151] In a specific implementation, a voltage application device is provided in the image forming apparatus, and a corresponding power supply can be applied to the first cleaning member 302 and / or the secondary transfer roller 207 through the voltage application device, so that a first potential difference is satisfied between the secondary transfer roller 207 and the first cleaning member 302.

[0152] Generally speaking, in the embodiments of the present application, the first cleaning member 302 and / or the secondary transfer roller 207 can receive the power supply of the voltage application device. When the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member 302 and the secondary transfer roller 207, and the toner on the secondary transfer roller 207 is transferred to the first cleaning member 302 under the action of the first potential difference.

[0153] In a possible implementation, when the toner carries a negative charge, since the negative charge moves in the direction of higher electric potential, a higher voltage (relative to the secondary transfer roller 207) can be applied to the first cleaning member 302 to achieve the transfer of the toner from the secondary transfer roller 207 to the first cleaning member 302. Specifically, when the toner carries a negative charge, a positive voltage can be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "first potential difference"; or a negative voltage can be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "first potential difference".

[0154] In a possible implementation, when the toner carries a positive charge, since the positive charge moves in the direction of lower electric potential, a lower voltage (relative to the secondary transfer roller 207) can be applied to the first cleaning member 302 to achieve the transfer of the toner from the secondary transfer roller 207 to the first cleaning member 302. Specifically, when the toner carries a positive charge, a positive voltage can be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "first potential difference"; or a negative voltage can be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "first potential difference".

[0155] It should be added that in the embodiments of the present application, the working principle of the transfer of the toner from the secondary transfer roller 207 to the first cleaning member 302 is the same as the working principle of the transfer of the toner from the transfer roller 106 to the first cleaning member 302 described above. Therefore, for the specific voltage configuration when the secondary transfer roller 207 and the first cleaning member 302 satisfy the "first potential difference", reference can be made to the above ( Figures 3C - 3FThe voltage configuration when the transfer roller 106 and the first cleaning member 302 satisfy the "first potential difference" is not described herein again for the sake of brevity. Ideally, the toner carried on the secondary transfer roller 207 has the same polarity of charge. However, in actual applications, there may be toner with a changed polarity. For the convenience of description, in the embodiments of the present application, the toner with a polarity that meets the expectation is referred to as "toner with a normal polarity"; the toner with a polarity that does not meet the expectation is referred to as "toner with an abnormal polarity". Exemplarily, the toner with a normal polarity carries a negative charge, and the toner with an abnormal polarity carries a positive charge; or, the toner with a normal polarity carries a positive charge, and the toner with an abnormal polarity carries a negative charge. That is to say, there may be toner carrying a positive charge and toner carrying a negative charge on the secondary transfer roller 207 at the same time.

[0156] Since negative charges move towards the direction of higher electric potential and positive charges move towards the direction of lower electric potential, when transferring toner with different polarities from the secondary transfer roller 207 to the first cleaning member 302, the potential difference configured between the secondary transfer roller 207 and the first cleaning member 302 is different. In order to transfer all the toner with two polarities on the secondary transfer roller 207 to the first cleaning member 302, two potential states can be configured for the first potential difference. For the convenience of description, these two potential states are respectively referred to as the "first potential state" and the "second potential state". In the first potential state, the toner with a normal polarity on the secondary transfer roller 207 is transferred to the first cleaning member 302; in the second potential state, the toner with an abnormal polarity on the secondary transfer roller 207 is transferred to the first cleaning member 302.

[0157] Exemplarily, the toner with a normal polarity carries a negative charge; the toner with an abnormal polarity carries a positive charge. In the first potential state, the potential of the first cleaning member 302 is greater than the potential of the secondary transfer roller 207. At this time, the electric field direction is from the first cleaning member 302 with a higher electric potential to the secondary transfer roller 207 with a lower electric potential. Therefore, the toner with a normal polarity (toner carrying a negative charge) can be transferred from the secondary transfer roller 207 to the first cleaning member 302. In the second potential state, the potential of the first cleaning member 302 is less than the potential of the secondary transfer roller 207. At this time, the electric field direction is from the secondary transfer roller 207 with a higher electric potential to the first cleaning member 302 with a lower electric potential. Therefore, the toner with an abnormal polarity (toner carrying a positive charge) can be transferred from the secondary transfer roller 207 to the first cleaning member 302.

[0158] Exemplarily, toner with normal polarity carries a positive charge; toner with abnormal polarity carries a negative charge. In the first potential state, the potential of the first cleaning member 302 is less than the potential of the secondary transfer roller 207. At this time, the electric field direction is from the secondary transfer roller 207 with a higher potential to the first cleaning member 302 with a lower potential. Therefore, the toner with normal polarity (toner carrying a positive charge) can be transferred from the secondary transfer roller 207 to the first cleaning member 302. In the second potential state, the potential of the first cleaning member 302 is greater than the potential of the secondary transfer roller 207. At this time, the electric field direction is from the first cleaning member 302 with a higher potential to the secondary transfer roller 207 with a lower potential. Therefore, the toner with abnormal polarity (toner carrying a negative charge) can be transferred from the secondary transfer roller 207 to the first cleaning member 302.

[0159] Upon further analysis, since the first potential state and the second potential state are opposite, therefore, in the first potential state, while transferring the toner with normal polarity on the secondary transfer roller 207 to the first cleaning member 302, it is also possible to transfer the toner with abnormal polarity on the first cleaning member 302 to the secondary transfer roller 207; in the second potential state, while transferring the toner with abnormal polarity on the secondary transfer roller 207 to the first cleaning member 302, it is also possible to transfer the toner with normal polarity on the first cleaning member 302 to the secondary transfer roller 207.

[0160] To avoid this problem, before switching from the first potential state to the second potential state (transferring toner with normal polarity first and then toner with abnormal polarity), it is usually necessary to ensure that the toner with normal polarity transferred to the first cleaning member 302 has been removed, so as to prevent the toner with normal polarity on the first cleaning member 302 from being transferred to the secondary transfer roller 207 again after switching to the second potential state. Or, before switching from the second potential state to the first potential state (transferring toner with abnormal polarity first and then toner with normal polarity), it is usually necessary to ensure that the toner with abnormal polarity transferred to the first cleaning member 302 has been removed, so as to prevent the toner with abnormal polarity on the first cleaning member 302 from being transferred to the secondary transfer roller 207 again after switching to the first potential state.

[0161] It should be added that in practical applications, the proportion of toner with abnormal polarity is usually small. Even if the secondary transfer roller 207 carries a small amount of toner with abnormal polarity, it will not cause too obvious contamination on the back of the paper P. Therefore, only the toner with normal polarity on the secondary transfer roller 207 can be transferred to the first cleaning member 302. In other words, the first potential difference only includes the first potential state.

[0162] In a possible implementation, the first cleaning member 302 has a columnar structure, and the secondary transfer roller 207 and the first cleaning member 302 are arranged in parallel (the axes of the secondary transfer roller 207 and the first cleaning member 302 are parallel). In addition, the surface of the secondary transfer roller 207 and the surface of the first cleaning member 302 may be tangent (in contact) or separated, and the embodiments of the present application do not make specific limitations thereto.

[0163] Wherein, the first cleaning member 302 rotates with the rotation of the secondary transfer roller 207. Those skilled in the art can also, according to actual needs, configure a driving mechanism for the first cleaning member 302 to drive the first cleaning member 302 to rotate when the surface of the secondary transfer roller 207 is tangent to the surface of the first cleaning member 302. The embodiments of the present application do not make specific limitations thereto.

[0164] When the surface of the secondary transfer roller 207 is separated from the surface of the first cleaning member 302, generally a driving mechanism needs to be configured for the first cleaning member 302 to drive the first cleaning member 302 to rotate. However, when the surface of the secondary transfer roller 207 is separated from the surface of the first cleaning member 302, the distance between the surface of the secondary transfer roller 207 and the surface of the first cleaning member 302 should not be too large, so as to prevent the toner from being unable to be transferred from the secondary transfer roller 207 to the first cleaning member 302 under the action of the first potential difference.

[0165] It should be further noted that those skilled in the art can also set the first cleaning member 302 to other structures or shapes according to actual needs, and the embodiments of the present application do not make specific limitations thereto.

[0166] Furthermore, after transferring the toner on the secondary transfer roller 207 to the first cleaning member 302, it is also necessary to remove the toner on the first cleaning member 302. On the contrary, if the toner on the first cleaning member 302 is not removed, in some cases (for example, the potential of the secondary transfer roller 207 and / or the first cleaning member 302 changes, or the toner on the first cleaning member 302 accumulates too much, resulting in insufficient cleaning of the secondary transfer roller 207, etc.), it may still cause contamination on the back of the paper P. Therefore, the transfer cleaning device provided by the embodiments of the present application further includes a second cleaning member 303, and the second cleaning member 303 can collect the toner on the first cleaning member 302.

[0167] Specifically, the first cleaning member 302 and / or the secondary transfer roller 207 can receive the power supply of the voltage application device. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning member 302 and the secondary transfer roller 207, and the toner collected on the first cleaning member 302 is transferred to the side of the secondary transfer roller 207 under the action of the second potential difference, and the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the secondary transfer roller 207.

[0168] In the embodiment of the present application, when the transfer cleaning device is in the second state, the toner on the first cleaning member 302 can be transferred to the secondary transfer roller 207 under the action of the second potential difference, and further transferred to the second cleaning member 303 through the secondary transfer roller 207, and the toner on the first cleaning member 302 is collected by the second cleaning member 303. For ease of understanding, the following will be described in detail with specific embodiments.

[0169] Please continue to refer to Figure 8A and Figure 8B , in the embodiment of the present application, the second cleaning member 303 is disposed at a position opposite to the transfer belt 205. The relative position relationship between the second cleaning member 303 and the transfer belt 205 is configured such that when the transfer belt 205 rotates relative to the second cleaning member 303, the second cleaning member 303 can clean the toner on the surface of the transfer belt 205. That is to say, the second cleaning member 303 can directly collect the toner on the surface of the transfer belt 205.

[0170] Specifically, the second cleaning member 303 includes a cleaning blade 3031 opposite to the surface of the transfer belt 205 and a toner accommodating chamber 3032. When the transfer belt 205 rotates relative to the second cleaning member 303, the cleaning blade 3031 on the second cleaning member 303 can scrape the toner on the surface of the transfer belt 205 and collect the scraped toner in the toner accommodating chamber 3032 of the second cleaning member 303. Of course, those skilled in the art can also set the second cleaning member 303 to other structures according to actual needs. For example, the second cleaning member 303 is prepared from a material having a toner adsorption function, and the toner is collected by adsorption of the toner.

[0171] In the embodiments of the present application, since the second cleaning member 303 can directly collect the toner on the surface of the transfer belt 205, when it is necessary to collect the toner on the first cleaning member 302 through the second cleaning member 303, it is necessary to transfer the toner on the first cleaning member 302 to the transfer belt 205. Specifically, first, transfer the toner on the first cleaning member 302 to the secondary transfer roller 207; then, transfer the toner on the secondary transfer roller 207 to the transfer belt 205. For the convenience of description, in the embodiments of the present application, the state of transferring the toner from the first cleaning member 302 to the secondary transfer roller 207 is referred to as the "second state" of the transfer cleaning device, as Figure 8B shown.

[0172] As described above, toner usually carries an electric charge (negative charge or positive charge). Therefore, by setting a corresponding potential difference between the first cleaning member 302 and the secondary transfer roller 207, the transfer of toner from the first cleaning member 302 to the secondary transfer roller 207 can be achieved. For the convenience of description, in the embodiments of the present application, the potential difference that satisfies this condition is referred to as the "second potential difference".

[0173] In a specific implementation, a voltage application device is provided in the image forming apparatus, and a corresponding power supply can be applied to the secondary transfer roller 207 and / or the first cleaning member 302 through the voltage application device, so that the second potential difference is satisfied between the secondary transfer roller 207 and the first cleaning member 302.

[0174] In a possible implementation manner, when the toner carries a negative charge, since the negative charge moves in the direction of higher electric potential, a higher potential (relative to the first cleaning member 302) can be applied to the secondary transfer roller 207 to achieve the transfer of toner from the first cleaning member 302 to the secondary transfer roller 207. That is to say, when the toner carries a negative charge, a positive voltage can be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "second potential difference"; a negative voltage can also be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "second potential difference".

[0175] In a possible implementation manner, when the toner carries a positive charge, since the positive charge moves in the direction of lower electric potential, a lower voltage (relative to the first cleaning member 302) can be applied to the secondary transfer roller 207 to achieve the transfer of toner from the first cleaning member 302 to the secondary transfer roller 207. That is to say, when the toner carries a positive charge, a positive voltage can be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "second potential difference"; a negative voltage can also be applied to both the secondary transfer roller 207 and the first cleaning member 302 to satisfy the "second potential difference".

[0176] It should be noted that in the embodiments of the present application, the working principle of the transfer of toner from the first cleaning member 302 to the secondary transfer roller 207 is the same as that of the transfer of toner from the first cleaning member 302 to the transfer roller 106 in the above text. Therefore, for the specific voltage configuration when the secondary transfer roller 207 and the first cleaning member 302 satisfy the "second potential difference", reference can be made to the voltage configuration when the transfer roller 106 and the first cleaning member 302 satisfy the "second potential difference" in the above text ( Figures 3G - 3J section). For the sake of brevity, it will not be elaborated here.

[0177] In a possible implementation manner, a corresponding power supply can be applied to the secondary transfer roller 207 and / or the first cleaning member 302 through the same voltage application device, so that the transfer cleaning device is in the first state or the second state. It can be understood that realizing the first state and the second state through the same voltage application device can save the number and layout of the voltage application devices, and while enabling the toner to be transferred to the expected object, it also makes the structure of the image forming apparatus simpler and the hardware cost lower.

[0178] Ideally, the toner carried on the first cleaning member 302 has the same polarity of charge. However, in practical applications, there may be toner with a changed polarity. That is to say, there may be toner carrying positive charges and toner carrying negative charges on the first cleaning member 302 at the same time.

[0179] Since negative charges move towards the direction of higher electric potential and positive charges move towards the direction of lower electric potential, therefore, when transferring toner with different polarities from the first cleaning member 302 to the secondary transfer roller 207, the potential difference configured between the secondary transfer roller 207 and the first cleaning member 302 is different. In order to transfer all the toner with two polarities on the first cleaning member 302 to the secondary transfer roller 207, two potential states can be configured for the second potential difference. For the sake of easy explanation, these two potential states are respectively referred to as the "third potential state" and the "fourth potential state". In the third potential state, the toner with the normal polarity on the first cleaning member 302 is transferred to the secondary transfer roller 207; in the fourth potential state, the toner with the abnormal polarity on the first cleaning member 302 is transferred to the secondary transfer roller 207.

[0180] Exemplarily, toner with normal polarity carries a negative charge; toner with abnormal polarity carries a positive charge. In the third potential state, the potential of the secondary transfer roller 207 is greater than that of the first cleaning member 302. At this time, the electric field direction is from the secondary transfer roller 207 with a high potential to the first cleaning member 302 with a low potential. Therefore, toner with normal polarity (toner carrying a negative charge) can be transferred from the first cleaning member 302 to the secondary transfer roller 207. In the fourth potential state, the potential of the secondary transfer roller 207 is less than that of the first cleaning member 302. At this time, the electric field direction is from the first cleaning member 302 with a high potential to the secondary transfer roller 207 with a low potential. Therefore, toner with abnormal polarity (toner carrying a positive charge) can be transferred from the first cleaning member 302 to the secondary transfer roller 207.

[0181] Exemplarily, toner with normal polarity carries a positive charge; toner with abnormal polarity carries a negative charge. In the third potential state, the potential of the secondary transfer roller 207 is less than that of the first cleaning member 302. At this time, the electric field direction is from the first cleaning member 302 with a high potential to the secondary transfer roller 207 with a low potential. Therefore, toner with normal polarity (toner carrying a positive charge) can be transferred from the first cleaning member 302 to the secondary transfer roller 207. In the fourth potential state, the potential of the secondary transfer roller 207 is greater than that of the first cleaning member 302. At this time, the electric field direction is from the secondary transfer roller 207 with a high potential to the first cleaning member 302 with a low potential. Therefore, toner with abnormal polarity (toner carrying a negative charge) can be transferred from the first cleaning member 302 to the secondary transfer roller 207.

[0182] Upon further analysis, since the third potential state and the fourth potential state are opposite, therefore, in the third potential state, while transferring the toner with normal polarity on the first cleaning member 302 to the secondary transfer roller 207, it is also possible to transfer the toner with abnormal polarity on the secondary transfer roller 207 to the first cleaning member 302; in the fourth potential state, while transferring the toner with abnormal polarity on the first cleaning member 302 to the secondary transfer roller 207, it is also possible to transfer the toner with normal polarity on the secondary transfer roller 207 to the first cleaning member 302.

[0183] To avoid this problem, before switching from the third potential state to the fourth potential state (transferring toner with normal polarity first and then toner with abnormal polarity), it is usually necessary to ensure that the toner with normal polarity transferred to the secondary transfer roller 207 has been cleared, so as to prevent the toner with normal polarity on the secondary transfer roller 207 from being transferred to the first cleaning member 302 again after switching to the fourth potential state. Or, before switching from the fourth potential state to the third potential state (transferring toner with abnormal polarity first and then toner with normal polarity), it is usually necessary to ensure that the toner with abnormal polarity transferred to the secondary transfer roller 207 has been cleared, so as to prevent the toner with abnormal polarity on the secondary transfer roller 207 from being transferred to the first cleaning member 302 again after switching to the third potential state.

[0184] It should be added that in practical applications, the proportion of toner with abnormal polarity is usually small. Even if a small amount of toner with abnormal polarity is carried on the first cleaning member 302, it will not have too much impact on the contamination of the back surface of the paper P. Therefore, only the toner with normal polarity on the first cleaning member 302 can be transferred to the secondary transfer roller 207. In other words, the second potential difference only includes the third potential state.

[0185] Furthermore, after transferring the toner on the first cleaning member 302 to the secondary transfer roller 207, it is also necessary to transfer the toner on the secondary transfer roller 207 to the transfer belt 205. In a specific implementation, the potential difference between the secondary transfer roller 207 and the transfer belt 205 satisfies that the toner on the first cleaning member 302 can be transferred from the secondary transfer roller 207 to the transfer belt 205. It can be understood that after transferring the toner on the first cleaning member 302 from the secondary transfer roller 207 to the transfer belt 205, the cleaning blade 3031 of the second cleaning member 303 can collect the toner on the surface of the transfer belt 205 into the toner storage chamber 3032 inside the second cleaning member 303. Regarding the setting method and working principle of the potential difference between the transfer belt 205 and the secondary transfer roller 207, reference can be made to the description of the first potential difference and the second potential difference in the above text. For the sake of brevity, it will not be elaborated here.

[0186] Please continue to refer to Figure 8A , when the transfer cleaning device is in the first state, the first cleaning member 302 is used to clean the toner on the surface of the secondary transfer roller 207. That is, at this time, the image forming device is in an imaging state, that is, the image forming device is in a state of transferring the toner image on the transfer belt 205 to the paper P. It can be understood that when the image forming device is in an imaging state, controlling the transfer cleaning device to work in the first state can timely clear the toner on the surface of the secondary transfer roller 207, and prevent the toner on the surface of the secondary transfer roller 207 from reaching the position of the back surface of the paper P after rotating one week, resulting in contamination of the back surface of the paper P.

[0187] Of course, those skilled in the art can also control the transfer cleaning device to operate in the first state when the image forming apparatus is in a non-imaging state, and clean the residual toner on the surface of the secondary transfer roller 207 through the first cleaning member 302. The embodiments of the present application do not make specific limitations thereto.

[0188] Please continue to refer to Figure 8B , when the transfer cleaning device is in the second state, the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the secondary transfer roller 207 and the transfer belt 205. At this time, the image forming apparatus is in a non-imaging state.

[0189] It can be understood that in the embodiments of the present application, when the image forming apparatus is in an imaging state, due to the presence of the paper P interval between the transfer belt 205 and the secondary transfer roller 207, the toner on the secondary transfer roller 207 cannot be transferred to the transfer belt 205. From another perspective, when the image forming apparatus is in an imaging state, if the transfer cleaning device is controlled to operate in the second state, the toner on the first cleaning member 302 will be directly transferred to the back surface of the paper P through the secondary transfer roller 207, causing contamination of the back surface of the paper P. Therefore, in the embodiments of the present application, the transfer cleaning device can only be controlled to operate in the second state when the image forming apparatus is in a non-imaging state.

[0190] It should be added that in other parts of this article, "the image forming apparatus is in an imaging state" may also be expressed as: the transfer member 301 arranged opposite to the first cleaning member 302 and the imaging member are in an imaging state. "The image forming apparatus is in a non-imaging state" may also be expressed as: the transfer member 301 arranged opposite to the first cleaning member 302 and the imaging member are in a non-imaging state. In the embodiments of the present application, the transfer member may be the secondary transfer roller 207, and the imaging member may be the transfer belt 205, the photosensitive drum 201C / M / Y / K, etc.

[0191] In addition, during the process of performing continuous image forming operations on multiple pages, there will be a certain interval between the papers P corresponding to adjacent two pages in the paper path channel, that is, there will be a certain interval between the head of the paper P corresponding to the previous page and the tail of the paper P corresponding to the next page. This interval may also be referred to as the "paper interval". In the embodiments of the present application, when the paper interval is located at the position corresponding to the transfer member 301, the image forming apparatus is in a non-imaging state.

[0192] Please continue to refer to Figure 8A, Ideally, during the transfer process, all the toner images on the surface of the transfer belt 205 will be completely transferred, that is, the toner images will be transferred to the paper P or the secondary transfer roller 207. However, in practical applications, there may be toner that has not been completely transferred (i.e., untransferred toner) in the toner images on the surface of the transfer belt 205. It can be understood that if the untransferred toner is not removed, the untransferred toner will continue to adsorb on the surface of the transfer belt 205, which will interfere with the subsequent toner images. Therefore, in the embodiments of the present application, the second cleaning member 303 is disposed at a position opposite to the transfer belt 205, and can also play a role in removing the untransferred toner. In other words, in the embodiments of the present application, the second cleaning member 303 can, on the one hand, collect the toner on the first cleaning member 302; on the other hand, it can remove the untransferred toner on the surface of the transfer belt 205, realizing the reuse of the second cleaning member 303.

[0193] It should be noted that Figure 8A and 8B The rotational directions of the transfer belt 205, the secondary transfer roller 207, the first cleaning member 302, and the transport direction of the paper P shown are only for an exemplary illustration, and the embodiments of the present application do not make specific limitations thereto.

[0194] See Figure 9A and 9B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiments of the present application. As Figure 9A and 9B shown, the difference between the embodiments of the present application and the embodiments shown in Figure 8A and 8B is that in the embodiments of the present application, the second cleaning member 303 is disposed at a position opposite to the secondary transfer roller 207. The relative position relationship between the second cleaning member 303 and the secondary transfer roller 207 is configured such that when the secondary transfer roller 207 rotates relative to the second cleaning member 303, the second cleaning member 303 can clean the toner on the surface of the secondary transfer roller 207. That is to say, the second cleaning member 303 can directly clean the toner on the surface of the secondary transfer roller 207.

[0195] In the embodiments of the present application, since the second cleaning member 303 can directly clean the toner on the surface of the secondary transfer roller 207, when it is necessary to clean the toner on the first cleaning member 302 by the second cleaning member 303, it is only necessary to transfer the toner on the first cleaning member 302 to the secondary transfer roller 207, and there is no need to further transfer the toner on the secondary transfer roller 207 to the transfer belt 205.

[0196] Please continue to refer to Figure 9A, when the transfer cleaning device is in the first state, the first cleaning member 302 is used to clean the toner on the surface of the secondary transfer roller 207. At the same time, the second cleaning member 303 can also collect the toner on the surface of the secondary transfer roller 207. That is to say, in the embodiment of the present application, when the transfer cleaning device is in the first state, the first cleaning member 302 and the second cleaning member 303 can jointly remove the toner on the surface of the secondary transfer roller 207, thereby improving the cleaning effect of the toner on the surface of the secondary transfer roller 207.

[0197] It can be understood that when the transfer cleaning device is in the first state, the cleaning sequence of the first cleaning member 302 and the second cleaning member 303 for the toner on the surface of the secondary transfer roller 207 is related to "the relative positional relationship between the transfer belt 205, the secondary transfer roller 207, the first cleaning member 302 and the second cleaning member 303, and the rotation direction of the secondary transfer roller 207". For the sake of convenience of description, in the embodiment of the present application, the tangent point between the secondary transfer roller 207 and the transfer belt 205 is called "the first tangent point A", and the tangent point between the secondary transfer roller 207 and the first cleaning member 302 is called "the second tangent point B".

[0198] In the embodiment of the present application, along the rotation direction of the secondary transfer roller 207, the first tangent point A is located on the downstream side of the second tangent point B, and the second cleaning member 303 is located on the downstream side of the first tangent point A. According to this positional relationship, after a part of the toner image on the transfer belt 205 is transferred to the position of the first tangent point A of the secondary transfer roller 207, as the secondary transfer roller 207 rotates, the toner carried on the secondary transfer roller 207 will first reach the position corresponding to the second cleaning member 303, and the second cleaning member 303 can remove the toner on the surface of the secondary transfer roller 207. If the second cleaning member 303 cannot completely remove the toner on the surface of the secondary transfer roller 207 (there is residual toner), as the secondary transfer roller 207 rotates, the residual toner on the secondary transfer roller 207 will reach the position of the second tangent point B, and the first cleaning member 302 can further remove the residual toner on the secondary transfer roller 207, thereby improving the cleaning effect of the toner on the surface of the secondary transfer roller 207.

[0199] Please continue to refer to Figure 9A , when the transfer cleaning device is in the first state, the image forming apparatus is in an imaging state. It can be understood that when the image forming apparatus is in the imaging state, controlling the transfer cleaning device to work in the first state can jointly remove the toner on the surface of the secondary transfer roller 207 by the first cleaning member 302 and the second cleaning member 303, improve the cleaning effect of the toner on the surface of the secondary transfer roller 207, and prevent the toner on the surface of the secondary transfer roller 207 from reaching the position on the back surface of the paper P after rotating one week, causing contamination of the back surface of the paper P.

[0200] Of course, those skilled in the art can also control the transfer cleaning device to operate in the first state when the image forming device is in a non-imaging state, and the residual toner on the surface of the secondary transfer roller 207 can be removed jointly by the first cleaning member 302 and the second cleaning member 303. The embodiments of the present application do not make specific limitations thereto.

[0201] Please continue to refer to Figure 9B , when the transfer cleaning device is in the second state, the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the secondary transfer roller 207. At this time, the image forming device is in a non-imaging state.

[0202] In the embodiments of the present application, along the rotation direction of the secondary transfer roller 207, the first tangent point A is located on the downstream side of the second tangent point B, and the second cleaning member 303 is located on the downstream side of the first tangent point A. According to this positional relationship, when the toner collected on the first cleaning member 302 is transferred to the second tangent point B position of the secondary transfer roller 207, as the secondary transfer roller 207 rotates, it will first reach the first tangent point A position and then reach the second cleaning member 303 position.

[0203] It can be understood that if the image forming device is in an imaging state and the toner on the surface of the secondary transfer roller 207 first reaches the first tangent point A position, it will cause the toner to be directly transferred to the back surface of the paper P, resulting in contamination of the back surface of the paper P. Therefore, in the embodiments of the present application, the transfer cleaning device can only be controlled to operate in the second state when the image forming device is in a non-imaging state.

[0204] It should be added that for other contents involved in the embodiments of the present application, reference can be made to Figure 8A and Figure 8B the descriptions of the embodiments shown. For the sake of brevity, they will not be elaborated here.

[0205] Refer to Figure 10A and 10B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiments of the present application. As Figure 10A and 10B shown, the difference between the embodiments of the present application and Figure 9A and 9B the embodiments shown is that in the embodiments of the present application, along the rotation direction of the secondary transfer roller 207, the second tangent point B is located on the downstream side of the first tangent point A, and the second cleaning member 303 is located on the downstream side of the second tangent point B.

[0206] As Figure 10AAs shown, when the transfer cleaning device is in the first state, according to the above positional relationship between the first tangent point A, the second tangent point B, and the second cleaning member 303, after a part of the toner image on the transfer belt 205 is transferred to the position of the first tangent point A of the secondary transfer roller 207, as the secondary transfer roller 207 rotates, the toner carried on the secondary transfer roller 207 will first reach the position of the second tangent point B. The first cleaning member 302 can remove the toner on the surface of the secondary transfer roller 207. If the first cleaning member 302 cannot completely remove the toner on the surface of the secondary transfer roller 207 (there is residual toner), as the secondary transfer roller 207 rotates, the residual toner on the secondary transfer roller 207 will reach the position of the second cleaning member 303, and the second cleaning member 303 can further remove the residual toner on the secondary transfer roller 207, thereby improving the cleaning effect of the toner on the surface of the secondary transfer roller 207.

[0207] Please continue to refer to Figure 10A , when the transfer cleaning device is in the first state, the image forming apparatus is in the imaging state. It can be understood that when the image forming apparatus is in the imaging state, by controlling the transfer cleaning device to operate in the first state, the first cleaning member 302 and the second cleaning member 303 can jointly remove the toner on the surface of the secondary transfer roller 207, improve the cleaning effect of the toner on the surface of the secondary transfer roller 207, and prevent the toner on the surface of the secondary transfer roller 207 from reaching the back surface position of the paper P after rotating one week, causing contamination of the back surface of the paper P.

[0208] Of course, those skilled in the art can also control the transfer cleaning device to operate in the first state when the image forming apparatus is in the non-imaging state, and the first cleaning member 302 and the second cleaning member 303 can jointly remove the toner on the surface of the secondary transfer roller 207. The embodiments of the present application do not make specific limitations on this.

[0209] Please continue to refer to Figure 10B , when the transfer cleaning device is in the second state, the toner collected on the first cleaning member 302 is transferred to the second cleaning member 303 through the secondary transfer roller 207. At this time, the image forming apparatus is in the non-imaging state.

[0210] In the embodiments of the present application, along the rotation direction of the secondary transfer roller 207, the second tangent point B is located on the downstream side of the first tangent point A, and the second cleaning member 303 is located on the downstream side of the second tangent point B. According to this positional relationship, when the toner collected on the first cleaning member 302 is transferred to the position of the second tangent point B of the secondary transfer roller 207, as the secondary transfer roller 207 rotates, it will first reach the position of the second cleaning member 303 and be removed by the second cleaning member 303.

[0211] It is understandable that if the image forming apparatus is in an imaging state, the toner on the surface of the secondary transfer roller 207 first reaches the position of the second cleaning member 303 and is removed by the second cleaning member 303. Even if a small amount of residual toner reaches the first tangent point A with the rotation of the secondary transfer roller 207, it will not cause too serious contamination to the back surface of the paper P. Therefore, in the embodiment of the present application, the transfer cleaning device can be controlled to operate in the second state when the image forming apparatus is in a non-imaging state, and the transfer cleaning device can also be controlled to operate in the second state when the image forming apparatus is in an imaging state.

[0212] It should be noted that for other content involved in the embodiments of the present application, reference can be made to Figure 9A and Figure 9B the description of the embodiments shown. For the sake of brevity, it will not be repeated here.

[0213] Refer to Figure 11A and 11B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiment of the present application. As Figure 11A and 11B shown, the difference between the embodiment of the present application and the embodiments shown in Figure 8A and 8B is that in addition to arranging the second cleaning member 303 at a position opposite to the transfer belt 205, a second cleaning member 303 is also arranged at a position opposite to the secondary transfer roller 207; the difference between the embodiment of the present application and the embodiments shown in Figure 9A and 9B is that in addition to arranging the second cleaning member 303 at a position opposite to the secondary transfer roller 207, a second cleaning member 303 is also arranged at a position opposite to the transfer belt 205.

[0214] That is to say, two second cleaning members 303 are arranged in the embodiment of the present application. By cleaning the toner of the first cleaning member 302 with the two second cleaning members 303, the cleaning effect of the toner can be improved.

[0215] For example, in Figure 11BIn the case where the transfer cleaning device is in the second state, after the toner collected on the first cleaning member 302 is transferred to the second tangent point B of the secondary transfer roller 207, it reaches the first tangent point A as the secondary transfer roller 207 rotates. At the first tangent point A, the toner can be transferred from the secondary transfer roller 207 to the transfer belt 205, and then removed by the second cleaning member 303 disposed at a position opposite to the transfer belt 205. In addition, at the first tangent point A, there may be some residual toner that is not transferred to the transfer belt 205. The residual toner continues to rotate with the secondary transfer roller 207 and reaches the second cleaning member 303, and then is removed by the second cleaning member 303. Therefore, by providing two second cleaning members 303, the cleaning effect of the toner can be improved.

[0216] It should be added that for other content involved in the embodiments of the present application, reference may be made to the descriptions of the above embodiments. For the sake of brevity, it will not be repeated here.

[0217] See Figure 12A and 12B , which is a schematic structural diagram of another transfer cleaning device provided by the embodiments of the present application. As Figure 12A and 12B shown, the difference between the embodiments of the present application and the embodiments shown in Figure 8A and 8B is that the second cleaning member 303 is disposed at a position opposite to the first cleaning member 302, and the second cleaning member 303 can directly collect the toner on the surface of the first cleaning member 302.

[0218] It can be understood that since the second cleaning member 303 can directly collect the toner on the surface of the first cleaning member 302, it is not necessary to transfer the toner collected on the first cleaning member 302 to the secondary transfer roller 207. That is to say, in the embodiments of the present application, it is only necessary to control the transfer cleaning device to work in the first state, and it is not necessary to control the transfer cleaning device to work in the second state.

[0219] Furthermore, in the embodiments of the present application, since the second cleaning member 303 can directly remove the toner on the surface of the first cleaning member 302, regardless of whether the image forming apparatus is in an imaging state (as Figure 12A shown) or a non-imaging state (as Figure 12B shown), it is possible to control the transfer cleaning device to work in the first state, and the toner on the secondary transfer roller 207 is collected by the first cleaning member 302. Further, the toner on the first cleaning member 302 is collected by the second cleaning member 303.

[0220] It should be added that for other content involved in the embodiments of the present application, reference may be made to the descriptions of the above embodiments. For the sake of brevity, it will not be repeated here.

[0221] In a possible implementation, if the current printing mode is borderless printing mode, the transfer cleaning device is started to be in the first state, and a first potential difference is formed between the first cleaning member 302 and the transfer member 301 to meet the following condition: the toner with normal polarity on the transfer member 301 can be transferred to the first cleaning member 302.

[0222] When the printing mode is borderless printing mode, part of the toner image on the image carrier 304 is relatively easy to be transferred to the transfer member 301. At this time, most of the toner carried on the transfer member 301 is toner with normal polarity. In the embodiments of the present application, controlling the first potential difference to meet the condition that the toner with normal polarity on the transfer member 301 can be transferred to the first cleaning member 302 can transfer most of the toner carried on the transfer member 301 to the first cleaning member 302, so as to minimize the contamination on the back of the paper P.

[0223] In a possible implementation, if the current printing mode is not borderless printing mode, the transfer cleaning device is started to be in the first state, and a first potential difference is formed between the first cleaning member 302 and the transfer member 301 to meet the following condition: the toner with abnormal polarity on the transfer member 301 can be transferred to the first cleaning member 302.

[0224] When the printing mode is not borderless printing mode, part of the toner image on the image carrier 304 is not easy to be transferred to the transfer member 301. At this time, most of the toner carried on the transfer member 301 is toner with abnormal polarity. In the embodiments of the present application, controlling the first potential difference to meet the condition that the toner with abnormal polarity on the transfer member 301 can be transferred to the first cleaning member 302 can transfer most of the toner carried on the transfer member 301 to the first cleaning member 302, so as to minimize the contamination on the back of the paper P.

[0225] In practical applications, there is a certain distance between "the tangent point (the first tangent point A) between the transfer member and the image carrier" and "the tangent point (the second tangent point B) between the transfer member and the first cleaning member". Therefore, if the synchronization control is performed on "applying a cleaning voltage to the first cleaning member to form a first potential difference with the transfer member" and "applying a transfer voltage to the transfer member", when the transfer member starts to transfer, some areas on the transfer member have not been cleaned.

[0226] Based on this, in the embodiments of the present application, the time point t1 when starting to apply a cleaning voltage to the first cleaning member to form a first potential difference with the transfer member is earlier than the time point t2 when starting to apply a transfer voltage to the transfer member, and t2 - t1 = Δt, Δt ≥ S / V lineAmong them, S is the arc length between the first tangent point A and the second tangent point B on the transfer member, and is the arc length from the second tangent point B pointing to the first tangent point A along the rotation direction of the transfer member, and V line is the linear velocity of the transfer member. That is to say, before starting the transfer, it is at least necessary to ensure that the cleaning of the arc length S has been completed.

[0227] For the convenience of understanding, the technical solutions provided by the embodiments of the present application will be described separately for the monochromatic image forming apparatus 100 and the color image forming apparatus 200 below.

[0228] See Figure 13A , which is a schematic diagram of an application scenario of a monochromatic image forming apparatus provided by an embodiment of the present application. In the embodiment of the present application, the image carrier 304 is Figure 1 the photosensitive drum 102 in the monochromatic image forming apparatus 100 shown; the transfer member 301 is Figure 1 the transfer roller 106 in the monochromatic image forming apparatus 100 shown.

[0229] As Figure 13A shown, there is a certain distance between the first tangent point A and the second tangent point B. In order to ensure that the position of the first tangent point A of the transfer roller 106 has been cleaned (cleaned by the first cleaning member 302) at the start of the transfer, the time point at which the first cleaning member 302 starts cleaning the transfer roller 106 generally needs to be earlier than the time point of starting the transfer.

[0230] On the contrary, if the formation of the first potential difference between the first cleaning member 302 and the transfer roller 106 is started while applying the transfer voltage (starting the transfer) to the transfer roller 106. Since the arc length S from the second tangent point B pointing to the first tangent point A along the rotation direction of the transfer roller 106 has not been cleaned, it may cause the toner carried in the area corresponding to the arc length S to be transferred to the back of the paper P, thereby causing contamination on the back of the paper P. For the convenience of description, in the embodiment of the present application, the time point at which the cleaning voltage is applied to the first cleaning member 302 to form the first potential difference with the transfer roller 106 (the time point at which the first cleaning member 302 starts cleaning the transfer roller 106) is defined as t1; the time point at which the transfer voltage is applied to the transfer roller 106 (the time point of starting the transfer) is defined as t2. In the embodiment of the present application, t1 and t2 need to satisfy the relationship: t2 - t1 = Δt, Δt ≥ S / V line Among them, V line is the linear velocity of the transfer roller 106. That is to say, before starting the transfer, it is at least necessary to ensure that the cleaning of the arc length S has been completed.

[0231] See Figure 14A , which is a schematic diagram of an application scenario of a color image forming apparatus provided by an embodiment of the present application. In the embodiment of the present application, the image carrier 304 is Figure 2The transfer belt 205 in the color image forming apparatus 200 shown; the transfer member 301 is Figure 2 the secondary transfer roller 207 in the color image forming apparatus 100 shown.

[0232] As Figure 14A shown, there is a certain distance between the first tangent point A and the second tangent point B. To ensure that the position of the first tangent point A of the secondary transfer roller 207 has been cleaned (cleaned by the first cleaning member 302) at the start of transfer, the time point at which the first cleaning member 302 starts cleaning the secondary transfer roller 207 generally needs to be earlier than the start of transfer.

[0233] Conversely, if while starting to apply a transfer voltage to the secondary transfer roller 207 (starting transfer), starting to control the formation of a first potential difference between the first cleaning member 302 and the secondary transfer roller 207. Since the arc length S from the second tangent point B along the rotation direction of the secondary transfer roller 207 to the first tangent point A has not been cleaned, it may cause the toner carried in the area corresponding to the arc length S to be transferred to the back of the paper P, thereby causing contamination on the back of the paper P. For ease of explanation, in the embodiments of the present application, the time point at which a cleaning voltage is applied to the first cleaning member 302 to form a first potential difference with the secondary transfer roller 207 (the time point at which the first cleaning member 302 starts cleaning the secondary transfer roller 207) is defined as t1; the time point at which a transfer voltage is applied to the secondary transfer roller 207 (the start of transfer) is defined as t2. In the embodiments of the present application, t1 and t2 need to satisfy the relationship: t2 - t1 = Δt, Δt ≥ S / V line where, V line is the linear velocity of the secondary transfer roller 207. That is, before starting transfer, it is at least necessary to ensure that the cleaning of the arc length S has been completed.

[0234] Similarly, since there is a certain distance between "the tangent point (the first tangent point A) between the transfer member and the image carrier" and "the tangent point (the second tangent point B) between the transfer member and the first cleaning member". Therefore, if synchronous control is performed on "stopping the application of the cleaning voltage to the first cleaning member to form the first potential difference with the transfer member" and "stopping the application of the transfer voltage to the transfer member", it will result in some areas on the transfer member not being cleaned after the transfer member ends transfer.

[0235] Based on this, in the embodiments of the present application, the time point t1' at which the application of the cleaning voltage to the first cleaning member to form a first potential difference with the transfer member is stopped is later than the time point t2' at which the application of the transfer voltage to the transfer member is stopped, and t1' - t2' = Δt', Δt' ≥ S' / V line where, S' is the arc length between the first tangent point A and the second tangent point B on the transfer member, and is the arc length from the first tangent point A along the rotation direction of the transfer member to the second tangent point B, Vline is the linear velocity of the transfer member. That is, after the transfer is completed, it is at least necessary to ensure that the cleaning of the arc length S’ is completed.

[0236] For the sake of easy understanding, the technical solutions provided in the embodiments of the present application will be described separately for the monochromatic image forming apparatus 100 and the color image forming apparatus 200 below.

[0237] See Figure 13B , which is a schematic diagram of an application scenario of another monochromatic image forming apparatus provided in the embodiment of the present application. In the embodiment of the present application, the image carrier 304 is Figure 1 the photosensitive drum 102 in the monochromatic image forming apparatus 100 shown in Figure 1 ; the transfer member 301 is

[0238] As Figure 13B shown, there is a certain distance between the first tangent point A and the second tangent point B. In order to ensure that the first tangent point A of the transfer roller 106 can be cleaned (cleaned by the first cleaning member 302) at the end of the transfer, the time point when the first cleaning member 302 finishes cleaning the transfer roller 106 usually needs to be later than the end of the transfer time point.

[0239] On the contrary, if the formation of the first potential difference between the first cleaning member 302 and the transfer roller 106 is ended at the same time as the transfer voltage applied to the transfer roller 106 is ended (the transfer is ended). Since the arc length S’ from the first tangent point A along the rotation direction of the transfer roller 106 to the second tangent point B has not been cleaned, it may cause the area corresponding to the arc length S’ to carry toner. The toner carried in the area corresponding to the arc length S’ may be transferred to the back of the paper P during the next transfer, thereby causing contamination on the back of the paper P. For the sake of easy explanation, in the embodiment of the present application, the time point when the cleaning voltage applied to the first cleaning member 302 is stopped to form the first potential difference with the transfer roller 106 (the time point when the first cleaning member 302 stops cleaning the transfer roller 106) is defined as t1'; the time point when the transfer voltage applied to the transfer roller 106 is stopped (the time point when the transfer is stopped) is defined as t2'. In the embodiment of the present application, t1' and t2' need to satisfy the relationship: t1' - t2' = Δt', Δt' ≥ S’ / V line . Wherein, V line is the linear velocity of the transfer roller 106. That is, after the transfer is stopped, it is at least necessary to ensure that the cleaning of the arc length S’ can be completed.

[0240] See Figure 14B , which is a schematic diagram of an application scenario of another color image forming apparatus provided in the embodiment of the present application. In the embodiment of the present application, the image carrier 304 is Figure 2The transfer belt 205 in the color image forming apparatus 200 shown; the transfer member 301 is Figure 2 the secondary transfer roller 207 in the color image forming apparatus 100 shown.

[0241] As Figure 14B shown, there is a certain distance between the first tangent point A and the second tangent point B. In order to ensure that when the transfer is completed, the position of the first tangent point A of the secondary transfer roller 207 can be cleaned (cleaned by the first cleaning member 302), the time point at which the first cleaning member 302 finishes cleaning the secondary transfer roller 207 generally needs to be later than the time point of the end of the transfer.

[0242] On the contrary, if while ending the application of the transfer voltage to the secondary transfer roller 207 (ending the transfer), the formation of the first potential difference between the first cleaning member 302 and the secondary transfer roller 207 is ended. Since the arc length S' of the first tangent point A along the rotation direction of the secondary transfer roller 207 pointing to the second tangent point B has not been cleaned yet, it may cause the area corresponding to the arc length S' to carry toner. The toner carried in the area corresponding to the arc length S' may be transferred to the back of the paper P during the next transfer, thereby causing contamination on the back of the paper P. For the sake of easy explanation, in the embodiments of the present application, the time point at which the application of the cleaning voltage to the first cleaning member 302 is stopped to form the first potential difference with the secondary transfer roller 207 (the time point at which the first cleaning member 302 stops cleaning the secondary transfer roller 207) is defined as t1'; the time point at which the application of the transfer voltage to the secondary transfer roller 207 is stopped (the time point of stopping the transfer) is defined as t2'. In the embodiments of the present application, t1' and t2' need to satisfy the relationship: t1' - t2' = Δt', Δt' ≥ S' / V line . Wherein, V line is the linear velocity of the secondary transfer roller 207. That is to say, after stopping the transfer, at least it is necessary to ensure that the cleaning of the arc length S' can be completed.

[0243] It can be understood that if the amount of toner carried on the transfer member 301 is small, the amount of toner collected by the first cleaning member 302 is small. In this case, it is not necessary to clean the first cleaning member 302 frequently. On the contrary, if the first cleaning member 302 is cleaned too frequently, it may increase the complexity of the control timing of the transfer cleaning device. In the embodiments of the present application, if it is detected that the toner transferred to the first cleaning member 302 needs to be cleaned, the second cleaning member 303 is started to collect the toner on the first cleaning member 302. On the contrary, if it is detected that the toner transferred to the first cleaning member 302 does not need to be cleaned, the second cleaning member 303 is not started to collect the toner on the first cleaning member 302.

[0244] In a specific implementation, a preset cleaning condition can be set. If it is detected that the preset cleaning condition is met, indicating that the toner transferred to the first cleaning member 302 needs to be cleaned, the second cleaning member 303 is used to clean the toner on the first cleaning member 302. If it is detected that the preset cleaning condition is not met, indicating that the toner transferred to the first cleaning member 302 does not need to be cleaned, the second cleaning member 303 is not used to clean the toner on the first cleaning member 302. Thereby, the cleanliness of the first cleaning member 302 can be ensured, while improving the cleaning effect, it can also prevent the first cleaning member 302 from being cleaned too frequently and affecting normal use.

[0245] Specifically, if the preset cleaning condition is met, the transfer cleaning device is activated to be in the second state to use the second cleaning member 303 to clean the toner on the first cleaning member 302. For the specific content of the second state, reference can be made to the above description. For the sake of brevity, it will not be elaborated here.

[0246] In a possible implementation manner, in the following at least one way, it is detected that the toner transferred to the first cleaning member needs to be cleaned: The accumulated actual print dots are greater than or equal to a preset dot threshold. In practical applications, the accumulated actual print dots are usually positively correlated with the amount of toner collected on the first cleaning member 302. Therefore, the amount of toner collected on the first cleaning member 302 can be reflected by the accumulated actual print dots.

[0247] The accumulated actual print pages are greater than or equal to a preset page threshold. In practical applications, the accumulated actual print pages are usually positively correlated with the amount of toner collected on the first cleaning member 302. Therefore, the amount of toner collected on the first cleaning member 302 can be reflected by the accumulated actual print pages.

[0248] The accumulated actual idle running distance of the motor of the photosensitive drum is greater than or equal to a preset distance. In practical applications, there is usually no image when the motor is idling, and there is no paper between the photosensitive drum and the transfer member 301. For example, paper intervals, or the waiting downtime after completing the image forming operation, etc. At the same time, when the motor is idling, it will also cause a small amount of toner to be carried on the surface of the photosensitive drum. At this time, since there is no paper between the photosensitive drum and the transfer member 301, the toner on the surface of the photosensitive drum will be transferred to the transfer member 301 and then to the first cleaning member 302. Therefore, the accumulated actual idle running distance of the motor of the photosensitive drum is usually positively correlated with the amount of toner collected on the first cleaning member 302. Therefore, the amount of toner collected on the first cleaning member 302 can be reflected by the accumulated actual idle running distance of the motor of the photosensitive drum.

[0249] The cumulative duration of the transfer cleaning device in the first state is greater than or equal to a preset duration. In practical applications, the cumulative duration of the transfer cleaning device in the first state is usually positively correlated with the amount of toner collected on the first cleaning member 302. Therefore, the amount of toner collected on the first cleaning member 302 can be reflected by the cumulative duration of the transfer cleaning device in the first state.

[0250] Before starting the printing operation and / or after ending the printing operation. Cleaning the toner on the first cleaning member 302 by the second cleaning member 303 before starting the printing operation can ensure that the first cleaning member 302 has more toner accommodation space after starting the printing operation, and as much as possible avoid cleaning the first cleaning part during the timing of the printing operation.

[0251] Cleaning the toner on the first cleaning member 302 by the second cleaning member 303 after ending the printing operation can ensure that the first cleaning member 302 is in a clean state when starting the next printing operation.

[0252] It should be added that those skilled in the art can combine the conditions listed above as preset cleaning conditions according to actual needs, that is, select multiple conditions as preset cleaning conditions, and the embodiments of the present application do not make specific limitations on this.

[0253] In a possible implementation manner, when it is detected that the toner transferred to the first cleaning member needs to be cleaned, then start using the second cleaning member to collect the toner on the first cleaning member, including: When performing continuous K-page printing operations, between the time point when the i-th page image transfer is completed and the time point when the (i + 1)-th page image transfer starts, start using the second cleaning member 303 to clean the toner on the first cleaning member 302. Wherein, K≥2, 1≤i<K, or set according to actual cleaning requirements.

[0254] That is to say, the interval between the transfer of adjacent two-page images can be used to clean the first cleaning member 302. That is, after a certain number of sheets of paper are printed, the second cleaning member 303 can be used to achieve periodic cleaning of the first cleaning member 302, which helps to ensure its cleanliness.

[0255] In a possible implementation manner, when it is detected that the toner transferred to the first cleaning member needs to be cleaned, then start using the second cleaning member to collect the toner on the first cleaning member, including: During the execution of a continuous K-page printing operation, if it is detected during the printing operation of the i-th page that the toner transferred to the first cleaning member needs to be cleaned, then between the time point when the transfer of the i-th page image is completed and the time point when the transfer of the (i + 1)-th page image starts, the second cleaning member 303 is used to clean the first cleaning member 302.

[0256] In the embodiments of the present application, if it is detected during the printing operation that the first cleaning member needs to be cleaned, then the adjacent two-page image transfer interval can be utilized to clean it using the second cleaning member. Thus, while reducing the impact on normal printing operations caused by overly frequent cleaning, it can also help ensure the cleanliness of the first cleaning member.

[0257] For ease of description, in the embodiments of the present application, the process of cleaning the first cleaning member 302 using the adjacent two-page image transfer interval is referred to as "continuous printing cleaning". The following provides an exemplary description of continuous printing cleaning in combination with a specific implementation manner.

[0258] See Figure 15 is a schematic flowchart of a continuous printing cleaning provided in the embodiments of the present application. As Figure 15 shown, it mainly includes the following steps.

[0259] Step S1501: Meet the preset cleaning condition, that is, detect that the toner transferred to the first cleaning member needs to be cleaned.

[0260] Step S1502: Set the paper interval time to the original paper interval time + N cleaning cycles.

[0261] In the embodiments of the present application, if the preset cleaning condition is met, it indicates that the first cleaning member needs to be cleaned using the adjacent two-page image transfer interval time. Therefore, the paper interval time is set. That is, the paper interval time is extended to reserve N cleaning cycles of cleaning time for the cleaning of the first cleaning member. The specific content of the cleaning cycle will be introduced in detail below.

[0262] Step S1503: Send the page synchronization signal of the current page.

[0263] Specifically, after receiving the image formation data of the current page, the image forming device generates a page synchronization signal, and the imaging member of the image forming device can perform corresponding operations according to this page synchronization signal.

[0264] Step S1504: Delay the time when all exposures of the current page are completed to: (distance from the exposure point to the transfer point of the photosensitive drum + paper length + original paper interval) / printing line speed + N cleaning cycles.

[0265] Specifically, adjust the time for completing the full exposure of the current page to: (the distance from the exposure point to the transfer point of the photosensitive drum + the paper length + the original paper interval) / the printing line speed + N cleaning cycles. That is to say, add N cleaning cycles to the paper interval between the current page and the next page to clean the toner on the first cleaning component.

[0266] Exemplarily, when the current page is Portrait A, after the exposure of Portrait A starts, adjust the time for completing the full exposure of Portrait A to: (the distance from the exposure point to the transfer point of the photosensitive drum + the paper length + the original paper interval) / the printing line speed + N cleaning cycles.

[0267] Step S1505: When the trailing edge of the paper of the current page leaves the transfer component, start the continuous printing cleaning timing sequence.

[0268] It can be understood that since the portrait and the paper are synchronized, after the trailing edge of the paper of the current page leaves the transfer component, the toner image of the current page has also been transferred. At this time, the continuous printing cleaning timing sequence can be started to clean the toner on the first cleaning component.

[0269] Specifically, after the trailing edge of the paper of the current page leaves the transfer component, control the transfer cleaning device to be in the second state, form a second potential difference between the first cleaning component and the transfer component, and the toner collected on the first cleaning component is transferred to the side of the transfer component under the action of the second potential difference, and then the toner collected on the first cleaning component is transferred to the second cleaning component through the transfer component.

[0270] For the specific content of cleaning the toner on the first cleaning component, reference can be made to the above description. For the sake of brevity, it will not be elaborated here.

[0271] In addition, since N cleaning cycles are added to the paper interval between the current page and the next page, the duration of the continuous printing cleaning timing sequence should be N cleaning cycles.

[0272] Step S1506: The time for restoring the paper interval is the original paper interval time.

[0273] Specifically, after completing the cleaning of the toner on the first cleaning component, restore the paper interval time of the next page to the original paper interval time, and then normal continuous printing can be carried out.

[0274] It should be added that in a continuous printing job, there may be multiple continuous printing cleaning timing sequences, and the embodiments of the present application do not make specific limitations on this.

[0275] In the embodiments of the present application, the first cleaning component is cleaned by using the interval time between the transfer of two adjacent page portraits. While completing the cleaning of the first cleaning component, the interruption of continuous multi-page printing operations can be avoided, improving the user experience.

[0276] It is understandable that when the toner on the first cleaning member 302 is collected by the second cleaning member 303, if the cleaning time is too short, the toner on the first cleaning member 302 may not be completely removed. Based on this, in the embodiments of the present application, at least one complete cleaning cycle T is set. cycle , during the complete cleaning cycle T cycle , the toner on the first cleaning member 302 is collected by the second cleaning member 303. Among them, during the complete cleaning cycle T cycle , the distance that the first cleaning member 302 rotates is greater than or equal to twice the circumference distance of the first cleaning member 302 to ensure that the toner on the first cleaning member 302 is cleaned.

[0277] Furthermore, during the complete cleaning cycle T cycle , it includes a first cleaning sub-cycle T cycle1 and a second cleaning sub-cycle T cycle2 . Among them, during the first cleaning sub-cycle T cycle1 , the toner with normal polarity on the first cleaning member 302 is collected by the second cleaning member 303; during the second cleaning sub-cycle T cycle2 , the toner with abnormal polarity on the first cleaning member 302 is collected by the second cleaning member 303. Thus, it can be ensured that both the toner with normal polarity and the toner with abnormal polarity on the first cleaning member 302 can be removed.

[0278] In a possible implementation manner, during the first cleaning sub-cycle T cycle1 , the distance that the first cleaning member 302 rotates is greater than or equal to the circumference distance of the first cleaning member 302 to ensure that the toner with normal polarity on the first cleaning member 302 is cleaned.

[0279] In a possible implementation manner, during the second cleaning sub-cycle T cycle2 , the distance that the first cleaning member 302 rotates is greater than or equal to the circumference distance of the first cleaning member 302 to ensure that the toner with abnormal polarity on the first cleaning member 302 is cleaned.

[0280] In practical applications, before the image forming apparatus starts the printing operation, it usually includes a pre-print preparation stage. In the embodiments of the present application, the time of the pre-print preparation stage can be used to clean the first cleaning member 302. For the convenience of understanding, it will be introduced in detail below in combination with specific implementation manners.

[0281] See Figure 16 , which is a schematic diagram of a cleaning process before starting the printing operation provided by the embodiments of the present application. As Figure 16 shown, it mainly includes the following steps.

[0282] Step S1601: Record T ex .

[0283] Specifically, T ex is the time point when the image starts to be exposed.

[0284] Step S1602: Record T read .

[0285] Specifically, T read is the time point when the feedback calculation for the pre-transfer processing timing is completed. Since cleaning can only start after the image starts to be exposed and the feedback calculation is completed, after receiving the start printing instruction, it is necessary to record the time point T ex when the image starts to be exposed and the time point T read when the feedback calculation for the pre-transfer processing timing is completed respectively. It should be noted that T read may be before T ex or after T ex .

[0286] Step S1603: Determine whether the condition: T ex >= T read .

[0287] Specifically, since T read may be before T ex or after T ex , it is necessary to determine whether the condition: T ex >= T read is satisfied. If the judgment result is yes, go to step S1605; if the judgment result is no, go to step S1604.

[0288] Step S1604: S clean = S img -(T read - T ex ) V line .

[0289] Specifically, S clean is the maximum allowable cleaning distance, S img is the distance from the image start exposure point to the cleaning end point, and V line is the printing line speed.

[0290] Since cleaning usually does not start until the feedback calculation is completed. Therefore, if the time point T read when the feedback calculation is completed is later than the time point T ex when the image starts to be exposed, then it is necessary to subtract T img from the distance S read from the image start exposure point to the cleaning end point.ex The distance corresponding to the time difference, and obtain the maximum allowable cleaning distance S clean .

[0291] Step S1605: S clean = S img .

[0292] It can be understood that when the time point T at which the image starts to be exposed ex is later than the time point T at which the feedback calculation is completed read , the maximum allowable cleaning distance S clean is equal to the distance S from the image start exposure point to the cleaning end point img .

[0293] Step S1606: Determine whether the condition is satisfied: S clean - S cycle > 0.

[0294] Specifically, S cycle is a cleaning cycle distance. In one possible implementation, a cleaning cycle distance includes a first cleaning sub-cycle distance S f and a second cleaning sub-cycle distance S e . Among them, in the first cleaning sub-cycle distance S f , the second cleaning member 303 is used to collect the toner with the normal polarity on the first cleaning member 302; in the second cleaning sub-cycle distance S e , the second cleaning member 303 is used to collect the toner with the abnormal polarity on the first cleaning member 302.

[0295] It can be understood that by judging the condition: S clean - S cycle > 0, it can be determined whether one or more complete cleaning cycles can be performed within the maximum allowable cleaning distance S clean . Specifically, if the judgment result is yes, go to step S1607; if the judgment result is no, go to step S1609.

[0296] Step S1607: n =( S clean / S cycle) .

[0297] Specifically, if S clean - S cycle > 0, it means that at least one complete cleaning cycle can be performed within the maximum allowable cleaning distance S clean . Further, according to the ratio of the maximum allowable cleaning distance S clean and the cleaning cycle distance S cycle , the number of cleaning cycles n can be determined.

[0298] Step S1608: D clean=( S clean -n S cycle) / V line 。

[0299] Specifically, D clean is the delay time for starting a cleaning cycle. During the delay time, the cleaning operation is not performed; after reaching the delay time D clean , the cleaning operation is started. Specifically, the cleaning operations for n consecutive cleaning cycles are performed.

[0300] Step S1609: D clean = 0, S e = S e -(S cycle -S clean )。

[0301] Specifically, if S clean -S cycle <0, it means that a complete cleaning cycle cannot be performed within the maximum allowable cleaning distance S clean . At this time, the cleaning operation needs to be started immediately, that is, D clean = 0, and the cleaning time is compressed (the cleaning time is less than a complete cleaning cycle).

[0302] In a possible implementation, a cleaning cycle distance includes a first cleaning sub-cycle distance S f and a second cleaning sub-cycle distance S e . Among them, during the first cleaning sub-cycle distance S f , the toner with normal polarity on the first cleaning member 302 is cleaned; during the second cleaning sub-cycle distance S e , the toner with abnormal polarity on the first cleaning member 302 is cleaned. In practical applications, since the proportion of abnormal polarity on the first cleaning member is small, when a complete cleaning cycle cannot be performed within the maximum allowable cleaning distance S clean , the second cleaning sub-cycle distance S e can be compressed to try to ensure that a complete first cleaning sub-cycle can be performed, and thus it can be ensured that the toner with normal polarity on the first cleaning member 302 can be removed.

[0303] Corresponding to the above embodiments, the embodiments of the present application also provide a control method for a transfer cleaning device.

[0304] See Figure 17 , which is a schematic flowchart of a control method for a transfer cleaning device provided by the embodiments of the present application. This method can be applied to the transfer cleaning device in the above embodiments, such asFigure 17 As shown, it mainly includes the following steps.

[0305] Step S1701: Control the voltage application device to apply power to the first cleaning member and / or the transfer member. When the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member and the transfer member, so that the toner on the transfer member is transferred to the first cleaning member under the action of the first potential difference.

[0306] Step S1702: Use the second cleaning member to collect the toner on the first cleaning member.

[0307] In the embodiment of the present application, when the transfer cleaning device is in the first state, a first potential difference is formed between the first cleaning member and the transfer member, so that the toner on the transfer member can be transferred to the first cleaning member. In addition, the second cleaning member can clean the toner on the first cleaning member. Furthermore, the toner on the transfer member can be cleaned, thereby helping to reduce the situation that the toner on the transfer member soils the paper during the printing process and affects the use. At the same time, the first cleaning member can also be cleaned. Therefore, the cleaning method for transfer in the embodiment of the present application can improve the cleanliness of the paper during the transfer process and also help to improve the cleaning function for transfer.

[0308] In a possible implementation manner, the control method of the transfer cleaning device further includes: controlling the voltage application device to apply power to the first cleaning member and / or the transfer member. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning member and the transfer member, so that the toner collected on the first cleaning member is transferred to the transfer member under the action of the second potential difference, and the toner collected on the first cleaning member is transferred to the second cleaning member through the transfer member.

[0309] It should be noted that for the specific content of the method embodiment, reference can be made to the description of the device embodiment above. For the sake of brevity, it will not be repeated here.

[0310] Corresponding to the above embodiment, the embodiment of the present application further provides an image forming apparatus.

[0311] See Figure 18 , which is a schematic structural diagram of an image forming apparatus further provided by the embodiment of the present application. As Figure 18 shown, the image forming apparatus includes a transfer cleaning device 1801. For the specific content of the transfer cleaning device, reference can be made to the description above. For the sake of brevity, it will not be repeated here.

[0312] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent the cases of A existing alone, A and B existing simultaneously, and B existing alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple.

[0313] Those of ordinary skill in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be implemented by a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0314] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0315] In several embodiments provided by the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0316] The above is only the specific implementation manner of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application and should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. A transfer cleaning device, characterized in that: include: A transfer component, used for transferring the image on the image carrier to the recording medium; A first cleaning component is arranged opposite to the transfer component; The first cleaning component and / or the transfer component receives power from a voltage applying device, and when the transfer cleaning device is in a first state, a first potential difference is formed between the first cleaning component and the transfer component, and the toner on the transfer component is transferred to the first cleaning component under the action of the first potential difference; The second cleaning component is used to collect carbon powder on the first cleaning component.

2. The transfer cleaning device according to claim 1, characterized in that: The first cleaning component and / or the transfer component receives power from a voltage applying device. When the transfer cleaning device is in a second state, a second potential difference is formed between the first cleaning component and the transfer component, and the carbon powder collected on the first cleaning component is transferred to the transfer component side under the action of the second potential difference, and the carbon powder collected on the first cleaning component is transferred to the second cleaning component through the transfer component.

3. The transfer cleaning device according to claim 1, characterized in that: When the transfer cleaning device is in the first state, the transfer component and the imaging component arranged opposite to the first cleaning component are in an imaging state, and the first cleaning component is used to clean the carbon powder on the surface of the transfer component.

4. The transfer cleaning device according to claim 2, characterized in that: When the transfer cleaning device is in the second state, the transfer component and the imaging component arranged opposite to the first cleaning component are in a non-imaging state, and the toner collected on the first cleaning component is transferred to the second cleaning component through the transfer component.

5. The transfer cleaning device according to claim 1, characterized in that: The second cleaning component comprises a carbon powder containing chamber, and the carbon powder containing chamber is used to collect carbon powder on the first cleaning component.

6. The transfer cleaning device according to claim 2, characterized in that: Transferring the carbon powder collected on the first cleaning component to the second cleaning component via the transfer component comprises: The potential difference between the transfer component and the image carrier satisfies that: the carbon powder on the first cleaning component can be transferred from the transfer component to the image carrier; the second cleaning component includes a cleaning scraper opposite to the surface of the image carrier, and the cleaning scraper collects the carbon powder on the surface of the image carrier into the carbon powder containing chamber inside the second cleaning component.

7. The transfer cleaning device according to claim 1, characterized in that: The transfer cleaning device is in a first state, and previously comprises: If the current printing mode is the borderless printing mode, the transfer cleaning device is started in the first state, and a first potential difference is controlled to be formed between the first cleaning component and the transfer component to meet the following condition: the carbon powder with normal polarity on the transfer component can be transferred to the first cleaning component.

8. The transfer cleaning device according to claim 1, characterized in that: The transfer cleaning device is in a first state, and previously includes: If the current printing mode is not the borderless printing mode, the transfer cleaning device is started in the first state, and a first potential difference is controlled to be formed between the first cleaning component and the transfer component to satisfy the following relationship: carbon powder with abnormal polarity on the transfer component can be transferred to the first cleaning component.

9. The transfer cleaning device according to claim 1, characterized in that: Also includes: The time point t1 at which the cleaning voltage is applied to the first cleaning component to form a first potential difference with the transfer component is earlier than the time point t2 at which the transfer voltage is applied to the transfer component, and t2-t1=Δt, Δt≥S / V line ; Wherein, S is the arc length between the first tangent point and the second tangent point on the transfer member, and is the arc length from the second tangent point to the first tangent point along the rotation direction of the transfer member, V line is the linear velocity of the transfer member, the first tangent point is the tangent point between the transfer member and the image carrier, and the second tangent point is the tangent point between the transfer member and the first cleaning member.

10. The transfer cleaning device according to claim 2, characterized in that: The same voltage applying device is used to apply power to the first cleaning member and / or the transfer member, so that the transfer cleaning device is in the first state or the second state.

11. The transfer cleaning device according to claim 1, characterized in that: Also includes: When it is detected that the toner transferred onto the first cleaning member needs to be cleaned, the second cleaning member is started to collect the toner on the first cleaning member.

12. The transfer cleaning device according to claim 11, characterized in that: The need to clean the toner transferred to the first cleaning component is detected by at least one of the following methods: The accumulated actual printing points are greater than or equal to the preset point threshold; The accumulated actual number of printed pages is greater than or equal to the preset page number threshold; The accumulated actual idling distance of the photosensitive drum motor is greater than or equal to the preset distance; The accumulated time duration that the transfer cleaning device is in the first state is greater than or equal to a preset time duration; Before starting a print operation and / or after ending a print operation.

13. The transfer cleaning device according to claim 11, characterized in that: When it is detected that the toner transferred to the first cleaning component needs to be cleaned, the second cleaning component is started to collect the toner on the first cleaning component, including: When performing a continuous K-page printing operation, between the time point when the image of the i-th page is completed and the time point when the image of the i+1-th page starts to be transferred, the second cleaning component is started to collect the toner on the first cleaning component.

14. The transfer cleaning device according to claim 13, characterized in that: When it is detected that the toner transferred to the first cleaning component needs to be cleaned, the second cleaning component is started to collect the toner on the first cleaning component, including: When performing a continuous K-page printing operation, if it is detected during the i-page printing operation that the toner transferred to the first cleaning component needs to be cleaned, the second cleaning component is started to clean the first cleaning component between the time point when the i-page image transfer is completed and the time point when the i+1-page image transfer starts.

15. The transfer cleaning device according to claim 1, characterized in that: Also includes: Set at least one complete cleaning cycle T cycle , in the complete cleaning cycle T cycle , collecting carbon powder on the first cleaning member using the second cleaning member; In the complete cleaning cycle T cycle In the embodiment, the first cleaning component rotates a distance greater than or equal to twice the circumference of the first cleaning component.

16. A control method for a transfer cleaning device, characterized in that: The method comprises using the transfer cleaning device according to any one of claims 1 to 15 to perform the following steps: Controlling the voltage applying device to apply power to the first cleaning component and / or the transfer component, when the transfer cleaning device is in a first state, a first potential difference is formed between the first cleaning component and the transfer component, so that the toner on the transfer component is transferred to the first cleaning component under the action of the first potential difference; The toner on the first cleaning member is collected by a second cleaning member.

17. The method according to claim 16, characterized in that Also includes: The voltage applying device is controlled to apply power to the first cleaning component and / or the transfer component. When the transfer cleaning device is in the second state, a second potential difference is formed between the first cleaning component and the transfer component, so that the carbon powder collected on the first cleaning component is transferred to the transfer component under the action of the second potential difference, and the carbon powder collected on the first cleaning component is transferred to the second cleaning component through the transfer component.

18. An image forming device, characterized in that: include: The transfer cleaning device according to any one of claims 1 to 15.

Images