Developer roller, process cartridge, and processing method for developer roller

Abstract

Disclosed in the present application are a developer roller, a process cartridge, and a processing method for the developer roller. The developer roller comprises a magnetic core and a developer sleeve, wherein the developer sleeve is made of metal, is sleeved on the magnetic core, and comprises a sleeve body and a working surface; the working surface is located on an outer surface of the sleeve body, and the working surface and the sleeve body are integrally formed and made of the same material; the working surface is a rough surface with a textured structure and is configured to carry toner; and the absolute value of the difference in the roughness of any two points on the working surface is ΔR1, where 0≤ΔR1≤0.6 μm. The roughness of the working surface of the developer roller in the present application is relatively uniform, such that a surface of the developer roller can stably and uniformly bear the toner, and the toner charge in different areas is consistent, making the density of a print image uniform, thus ensuring the photocopying quality of printed matter.

Description

Developing roller, processing box and developing roller processing method

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 29, 2023, with application number 202311869964.5 and application name “Developing roller, processing box and processing method of developing roller”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of image forming technology, and in particular to a developing roller, a processing box, and a processing method of the developing roller. Background Art

[0003] During the laser printing process, the surface coating of the developer roller and sleeve directly contacts and transports toner. Therefore, the coating quality affects the toner's carrying capacity and charge, which in turn directly impacts the image quality. The developer roller's surface coating must possess excellent conductivity, wear resistance, adhesion, and surface roughness to facilitate toner transfer.

[0004] In the prior art, a coating with a certain roughness is usually formed on the developing sleeve by oil spraying or sand blasting. However, the roughness of the coating formed by oil spraying or sand blasting is uneven, which affects the amount of toner adsorbed onto the photosensitive drum for imaging, and further affects the uniformity of the image concentration. Summary of the Invention

[0005] In order to overcome the problems existing in the above-mentioned prior art, the main purpose of the present application is to provide a developing roller whose rough surface for carrying carbon powder is not easily worn and has a relatively uniform roughness.

[0006] In order to achieve the above objectives, this application specifically adopts the following technical solutions:

[0007] In a first aspect, the present application provides a developing roller, comprising:

[0008] Magnetic core;

[0009] A developing sleeve, wherein the developing sleeve is made of metal and is sleeved on the magnetic core. The developing sleeve comprises a sleeve body and a working surface, wherein the working surface is located on the outer surface of the sleeve body, and the working surface and the sleeve body are integrally formed and made of the same material;

[0010] The working surface is a rough surface with a concave-convex structure and is used to carry carbon powder; the absolute value of the roughness difference between any two points on the working surface is ΔR1, and 0≤ΔR1≤0.6μm.

[0011] In some embodiments, the absolute value of the roughness difference between any two points on the working surface is 0≤ΔR1≤0.3 μm.

[0012] In a second aspect, the present application further provides a developing roller, comprising:

[0013] Magnetic core;

[0014] A developing sleeve, wherein the developing sleeve is made of metal and is sleeved on the magnetic core. The developing sleeve comprises a sleeve body and a working surface, wherein the working surface is located on the outer surface of the sleeve body, and the working surface and the sleeve body are integrally formed and made of the same material;

[0015] The working surface is a rough surface with a concave-convex structure and is used to carry carbon powder; the maximum absolute value of the roughness difference between any two points on the working surface is ΔR max , and 0.1μm≤ΔR max ≤0.6μm.

[0016] In some embodiments, the ΔR max Satisfies: 0.1μm≤ΔR max ≤0.3μm.

[0017] In a third aspect, the present application further provides a developing roller, comprising:

[0018] Magnetic core;

[0019] A developing sleeve, wherein the developing sleeve is made of metal and is sleeved on the magnetic core. The developing sleeve comprises a sleeve body and a working surface, wherein the working surface is located on the outer surface of the sleeve body, and the working surface and the sleeve body are integrally formed and made of the same material;

[0020] The working surface is a rough surface with a concave-convex structure and is used to carry carbon powder; the absolute value of the roughness difference between any two points on the working surface located in the axial direction of the developing sleeve is ΔR2, and the absolute value of the roughness difference between any two points on the working surface located in the circumferential direction of the developing sleeve is ΔR3, and,

[0021] 0≤ΔR2≤0.6μm;

[0022] 0≤ΔR3≤0.6μm.

[0023] In some embodiments, an absolute value ΔR2 of a roughness difference between any two points on the working surface located in the axial direction of the developing sleeve satisfies: 0≤ΔR2≤0.3 μm; and / or

[0024] An absolute value ΔR3 of a roughness difference between any two points on the working surface in the circumferential direction of the developing sleeve satisfies the following: 0≤ΔR3≤0.3 μm.

[0025] In some embodiments, the roughness value of the working surface is Ra, and 0.9 μm≤Ra≤3.0 μm.

[0026] In some embodiments, the roughness value Ra of the working surface satisfies: 1.3 μm≤Ra≤1.9 μm.

[0027] In some embodiments, no chamfers are provided on either end of the sleeve body.

[0028] In some embodiments, at least one end of the sleeve body is chamfered.

[0029] In some embodiments, the developing roller further includes a transmission head and a conductive mechanism respectively disposed at both ends of the sleeve body, the transmission head being used to receive an external driving force, and the conductive mechanism being used to connect the sleeve body to an external power source.

[0030] In some embodiments, the conductive mechanism includes a mounting bracket and a wire; the mounting bracket is installed at the end of the sleeve body; the wire is installed on the mounting bracket, one end of the wire is connected to the sleeve body, and the other end of the wire is used to connect to the external power supply.

[0031] In some embodiments, the sleeve body and the working surface are both made of aluminum.

[0032] In some embodiments, the concavo-convex structure of the rough surface has a regular or irregular shape.

[0033] In some embodiments, the concave-convex structure of the rough surface is arranged regularly or irregularly.

[0034] In some embodiments, the rough surface is formed by rolling a processing roller on the outer surface of the sleeve body, and the concave-convex structure on the rough surface is generated by transfer printing of the processing roller.

[0035] In some embodiments, the concave-convex structure of the rough surface is transferred from the processing roller to the outer surface of the sleeve body when the processing roller applies a predetermined pressure to the outer surface of the sleeve body and drives the sleeve body to rotate a preset number of circles, so that the rough surface has a preset roughness.

[0036] In some embodiments, the rough surface is formed by a processing roller group rolling the outer surface of the sleeve body, wherein the processing roller group includes a plurality of processing rollers, and the plurality of processing rollers are spaced apart in the circumferential direction to form a processing area for accommodating the sleeve body.

[0037] In some embodiments, the processing roller assembly includes three processing rollers, and the three processing rollers are spaced apart along the circumferential direction to form a processing area for accommodating the sleeve body.

[0038] In some embodiments, the line connecting the axes of the three processing rollers on the same cross section forms an equilateral triangle or an isosceles triangle.

[0039] In some embodiments, the roughness of the outer surface of the processing roller is greater than or equal to the preset roughness of the working surface.

[0040] In a fourth aspect, the present application also provides a processing box, which includes a photosensitive drum, a powder bin, a waste powder bin and the developing roller described in any of the above embodiments, the photosensitive drum is installed in the waste powder bin, and the developing roller is installed in the powder bin.

[0041] In a fifth aspect, the present application further provides a method for processing a developing roller, the method comprising:

[0042] Controlling the processing roller to apply a predetermined pressure to the outer surface of the sleeve body of the developing roller;

[0043] Controlling the rotation of the processing roller to drive the sleeve body to rotate a preset number of turns, so that the concave-convex structure of the processing roller is transferred to the outer surface of the sleeve body, so that the outer surface of the sleeve body forms a working surface with a preset roughness;

[0044] in,

[0045] The absolute value of the roughness difference between any two points on the working surface is

[0046] ΔR1, and 0≤ΔR1≤0.6μm; or

[0047] The absolute value of the roughness difference between any two points on the working surface located in the axial direction of the developing sleeve is ΔR2, and the absolute value of the roughness difference between any two points on the working surface located in the circumferential direction of the developing sleeve is ΔR3, and 0≤ΔR2≤0.6μm; 0≤ΔR3≤0.6μm; or

[0048] The maximum absolute value of the roughness difference between any two points on the working surface is ΔR max , and 0.1μm≤ΔR max ≤0.6μm.

[0049] In some embodiments, a predetermined pressure is applied to the outer surface of the sleeve body of the developing roller by at least one group of processing roller groups, and the rotation of at least one group of processing roller groups is controlled to drive the sleeve body to rotate a preset number of times, so that the concave and convex structure of at least one group of processing roller groups is transferred to the outer surface of the sleeve body, so that the outer surface of the sleeve body forms a working surface with a preset roughness, wherein the processing roller group includes a plurality of processing rollers, and the plurality of processing rollers are spaced apart in the circumferential direction to form a processing area for accommodating the sleeve body.

[0050] In some embodiments, the processing roller set includes three processing rollers, and the line connecting the axes of the three processing rollers on the same cross section forms an equilateral triangle or an isosceles triangle.

[0051] In some embodiments, the roughness of the outer surface of the processing roller is greater than or equal to the maximum value of the roughness of the working surface.

[0052] Compared to the prior art, the developing roller of the present application includes a magnetic core and a developing sleeve. The developing sleeve is sleeved around the magnetic core and includes a sleeve body and a working surface. The working surface is located on the outer surface of the sleeve body and is integrally formed with the sleeve body and made of metal. The working surface is a rough surface with a concave-convex structure, and at least a portion of the working surface is used to carry toner. Therefore, during the operation of the developing roller, the working surface used to carry toner is not easily worn, thereby improving the stability of the developing roller quality and the quality of printed copies. Moreover, because the roughness of the developing roller working surface changes little throughout the life cycle of the process cartridge, the overall toner consumption is reduced.

[0053] Furthermore, the absolute value of the roughness difference between any two points on the working surface for carrying toner satisfies ΔR1, which satisfies 0≤ΔR1≤0.6μm. Alternatively, the absolute values ​​of the roughness difference between any two points on the working surface for carrying toner in the axial and circumferential directions of the developing sleeve satisfies ΔR2 and ΔR3, respectively, which satisfies 0≤ΔR2≤0.6μm and 0≤ΔR3≤0.6μm. In other words, the roughness of the working surface for carrying toner is relatively uniform, enabling the developing roller surface to stably and evenly carry toner, while also ensuring a consistent toner charge across different areas, resulting in uniform printed image density and ensuring high-quality photocopies. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a three-dimensional view of a processing box provided in an embodiment of the present application.

[0055] FIG2 is a schematic structural diagram of a developing roller provided in an embodiment of the present application.

[0056] FIG3 is a three-dimensional view of the processing roller assembly provided in an embodiment of the present application.

[0057] FIG4 is a schematic structural diagram of a developing roller provided in an embodiment of the present application.

[0058] Figure symbols: 1, developing roller; 11, magnetic core; 12, developing sleeve; 121, working surface; 122, non-working surface; 2, processing roller; 100, processing box. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0060] In the description of this application, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more, and the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0061] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also indirectly connected to the other element "on" or "under" through an intermediate element.

[0062] It should be noted that surface roughness refers to the unevenness of the machined surface with small spacing and tiny peaks and valleys. The distance (wave pitch) between two peaks or two valleys is very small (less than 1 mm), which belongs to the micro-geometric shape error. Surface roughness is generally formed by the processing method used and other factors. Due to the differences in processing methods and workpiece materials, the depth, density, shape and texture of the marks left on the machined surface are different. The roughness characteristic parameter Ra selected in this application refers to the arithmetic mean deviation of the profile, which is the arithmetic mean of the absolute value of the profile deviation within a certain sampling length. In this industry, 3 to 5 positions are generally selected on the rough surface of the developing roller to measure the Ra value, so as to determine the Ra range of the rough surface of the developing roller, that is, the roughness Ra of any point on the rough surface of the developing roller is within the aforementioned determined range. For example, 5 positions are evenly selected on the rough surface along the axial direction of the developing roller for measurement.

[0063] Laser printers are a common device used in offices and homes. The process cartridge is removably installed within the printer body, powered by the printer and supplying toner. The process cartridge primarily comprises a photosensitive drum, a developing roller, a toner hopper housing, and a waste toner hopper housing. The photosensitive drum is mounted within the waste toner hopper housing, while the developing roller is mounted within the toner hopper housing. The magnetic developing roller consists of a magnetic core and a developing sleeve. The developing sleeve is made of metal and coated. The coating requires a certain level of conductivity, wear resistance, and roughness.

[0064] The developing roller is a crucial component for transporting toner. During operation, the magnetic core remains stationary, while the developing sleeve rotates around its axis. Toner supplied from the powder hopper is attracted to the surface of the developing sleeve by the magnetic force of the magnetic core. Friction between the toner on the developing sleeve and the powder blade creates static electricity, forming a thin, uniform layer of toner on the sleeve's surface that rotates with the sleeve. As the developing roller rotates, carrying the toner, the static electricity is applied to the metal developing sleeve, where it is affected by the electric field. Furthermore, the magnetic force of the developing roller's magnetic core binds the toner to the sleeve's surface, resulting in opposite directions of the magnetic and electric forces. While the magnetic force is constant, the electric force varies depending on the developing roller's charging voltage. When the developer roller's charging voltage is high, the electric force on the toner is greater than the magnetic force, causing the toner to break away from the developer roller and fly out. When the developer roller's charging voltage is low, the electric force on the toner is less than the magnetic force, causing the toner to be bound by the magnetic force and return to the surface of the developer roller's developing sleeve. During toner transport, the developer roller and photosensitive drum are precisely positioned relative to each other. Positioning members secure the rotating shaft of the developer roller and developing sleeve to the process cartridge, allowing for free rotation. When the developer roller, carrying toner, rotates within a certain distance of the photosensitive drum, the toner on the developer roller's surface is attracted to the electrostatic latent image formed on the photosensitive drum surface by the magnetic force of the core, the electric force of the developer roller, and the electric force of the photosensitive drum, completing development. The visible image formed on the photosensitive drum surface is then transferred to paper, where it is cured by the printer's heat and pressure.

[0065] During the laser printing process, the surface coating of the developer roller and sleeve directly contacts and transports toner. Therefore, the coating quality affects the toner carrying capacity and charge, which in turn directly affects the image quality. The developer roller surface coating must not only have good electrical properties, but also good wear resistance, adhesion, and surface roughness to facilitate toner transfer.

[0066] If the coating on the developer roller's developing sleeve is too rough, such as with damaged areas or dirt, it will cause periodic defects such as dots, lines, and patches on the printed page. If the coating on the developer roller is too thin, it will not be conducive to the transfer of toner and it will be difficult to build a good toner layer. The print quality produced by such a developer roller will be very shallow. Deep wear lines in the circumferential direction will cause vertical white lines on the printed page. A poor developer roller surface will cause serious ghosting in printed products.

[0067] On the other hand, in order to achieve high-precision images, the relative position relationship between the developing roller and the photosensitive drum needs to be maintained at a certain level so that the toner can be transferred from the developing roller to the photosensitive drum stably and evenly. This places precision requirements on the outer surface of the developing roller, that is, the outer diameter of the developing roller must fluctuate within a predetermined precision range to ensure that the relative position of the developing roller and the photosensitive drum remains in a certain stable state so that the toner is provided stably and evenly, thereby achieving stable and uniform high-quality image printing.

[0068] Thus, the developing roller plays an important role in the laser printer, and the quality of the developing roller directly affects the quality of printing.

[0069] In the prior art, the developing sleeve of a developing roller is typically a circular sleeve formed from metal, alloy, or compound. A processing technique is employed to form a conductive coating on the sleeve surface to a predetermined roughness. This allows for stable and reliable transport of carbon powder on the developing sleeve of the developing roller during high-speed rotation, ensuring that the image printing concentration is not affected and achieving uniform printing. The developing sleeve of the developing roller can be made of aluminum, brass, stainless steel, or conductive resin, but aluminum is generally used due to cost and precision considerations. The aluminum tube of the developing sleeve of the developing roller is typically formed from a cylindrical blank having the desired inner and outer diameters by extrusion, rough drawing, and straightening. The cylindrical blank is then cut into aluminum tubes of a predetermined length, and a flange member is pressed into the end of the aluminum tube. The tube is then subjected to a cleaning and baking process, such as turning or centerless grinding, and then the surface of the aluminum tube is coated to achieve the desired surface roughness. When surface processing the aluminum developing sleeve, the conventional method is to spray oil or sandblast the aluminum base to form a conductive coating. Taking the oil spraying process as an example, the first thing to do is to prepare the oil spraying process materials, that is, the oil material. Commonly used oil material components include resin, graphite, conductive particles, acetone, thickener, etc. The components are synthesized into oil according to a certain ratio, and sprayed on the surface of the developing sleeve for multiple times. After high-temperature curing and polishing, a coating with a certain roughness is formed on the developing sleeve. The coating surface has a certain concave-convex structure to absorb carbon powder. When the coating surface reaches a certain roughness, it can rub against the carbon powder and the scraper to make the carbon powder statically charged, so that the developing roller can transport the carbon powder to the photosensitive drum to complete the printing task.

[0070] The developing rollers produced in the above-mentioned prior art have large dispersion in performance parameters, poor consistency in performance indicators, unstable quality, and poor coating durability.

[0071] The oil spraying process results in a wide range of surface roughness variations between different areas of the developer roller and sleeve. The solid particles in the conductive coating are often poorly dispersed, making it difficult to achieve a uniformly rough surface. The coating's roughness values ​​vary significantly from area to area. Because synthetic oils are sprayed in mass production, the surface roughness values ​​of developer rollers produced during the same spraying process vary widely, and coatings applied from batch to batch can even further vary in quality. This variation in roughness results in uneven toner distribution at different locations on the same developer roller surface, leading to significant variations in charge levels and uneven blackness values ​​on the printed page, impacting print quality.

[0072] Oil spraying or sandblasting can cause deformation on the developer roller surface, negatively impacting its rotation. Excessive outer diameter runout can cause fluctuations in the gap between the developer sleeve and the photosensitive drum, leading to an unstable developer supply to the drum and, consequently, a lack of proper toner concentration in the resulting image. Furthermore, the environmental hazards and human health impacts of the coating materials used in the spray coating process, such as acetone, cannot be ignored.

[0073] Furthermore, the coating material on the developer sleeve produced by the oil-spraying process has poor wear resistance, causing the concave-convex structure of the developer sleeve coating to rapidly wear out from constant friction with toner and the scraper, reducing its roughness and the amount of toner absorbed, ultimately causing the printed image to fade. To ensure that the printed image remains within an acceptable lightening range even when the concave-convex structure is severely worn later in the life cycle of the process cartridge, the initial roughness of the concave-convex structure of the developer sleeve coating must be increased. However, this will cause the developer roller to carry a large amount of toner during operation during the initial use of the process cartridge, increasing toner consumption.

[0074] The invention aims to address the problem that the graphite resin coating of the conventional developer roller is easily worn out during long-term use. When the concave-convex structure of the coating is worn, the amount of toner adsorbed decreases, the coating becomes unevenly rough, and the developer roller cannot stably transport toner, which significantly affects the density of the image formed and results in poor print quality. The invention of this application is to prepare a developer roller with good wear resistance. The coating of the developer roller is not easily worn out by friction during the toner transport process, ensuring that the toner is stably adsorbed on the developer roller surface and can be transported evenly and reliably.

[0075] 1 and 2 , an embodiment of the present application discloses a processing box 100, which includes a photosensitive drum, a developing roller 1, a powder bin, and a waste powder bin. The photosensitive drum is mounted in the waste powder bin, and the developing roller 1 is mounted in the powder bin. The developing roller 1 includes a magnetic core 11 and a developing sleeve 12. The developing sleeve 12 is sleeved on the magnetic core 11, and the developing sleeve 12 is coaxially arranged with the magnetic core 11. Specifically, the developing sleeve 12 includes a sleeve body, a non-working surface 122, and a working surface 121 for carrying toner. The working surface 121 is located on the outer surface of the sleeve body, and the working surface 121 and the non-working surface 122 are integrally formed with the sleeve body and made of the same material. The working surface 121 is provided as a rough surface with a concave-convex structure, and the non-working surface 122 is provided on the outer surface of the sleeve body and located at both ends of the working surface 121. Among them, the developing sleeve 12 is a cylindrical sleeve formed of metal, alloy or compound. In this embodiment, the developing sleeve 12 is made of aluminum, that is, an aluminum tube. The working surface 121 is a rough surface with a preset roughness formed by rolling the outer surface of the aluminum tube with a processing roller. The non-working surface 122 is a smooth surface of the outer surface of the aluminum tube without rolling the processing roller, and can also be partially or completely a rough surface with a concave-convex structure. The roughness of the rough surface of the non-working surface 122 can be the same as or different from the roughness of the working surface 121.

[0076] In some embodiments, the absolute value ΔR1 of the roughness difference between any two points on the working surface 121 satisfies 0≤ΔR1≤0.6 μm, that is, ΔR1=|Ra1-Ra2|, where Ra1 and Ra2 are the roughness values ​​measured at any two positions on the working surface 121 for carrying carbon powder.

[0077] Specifically, the absolute value ΔR1 of the roughness difference between any two points on the working surface 121 for carrying carbon powder may be 0 μm, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, etc.

[0078] In some embodiments, the ranges of the roughness Ra and the roughness Ra of the working surface 121 in the axial direction of the developing sleeve 12 can be the same or different. The roughness of any two points on the working surface 121 for carrying toner in the axial direction of the developing sleeve 12 are Ra3 and Ra4, respectively, and the absolute value of the difference between the two is ΔR2 = |Ra3-Ra4|, and ΔR2 meets the following range condition: 0≤ΔR2≤0.6μm. Specifically, the absolute value ΔR2 can be 0μm, 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, etc. The roughness of any two points on the working surface 121 in the circumferential direction of the developing sleeve 12 is Ra5 and Ra6, respectively, and the absolute value of the difference between the two is ΔR3 = |Ra5-Ra6|, and ΔR3 meets the following range condition: 0≤ΔR3≤0.6μm. Specifically, the absolute value ΔR3 may be 0 μm, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, etc.

[0079] In some embodiments, the roughness value Ra of the working surface 121 is in the range of 0.9 μm ≤ Ra ≤ 3.0 μm. Specifically, the roughness value Ra of the working surface 121 can be 0.9 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm, 3.0 μm, etc. The roughness range of the product can be determined according to actual needs. For example, the roughness Ra of the working surface of product A is in the range of 0.9 μm ≤ Ra ≤ 1.5 μm, and the absolute value range of the roughness difference between any two points on the working surface of product A satisfies [0, 0.6 μm]. For another example, the roughness Ra of the working surface of product B is in the range of 1.0 μm ≤ Ra ≤ 1.6 μm. For another example, the roughness Ra of the working surface of product C is in the range of 1.3 μm ≤ Ra ≤ 1.9 μm. The roughness Ra of the working surface of product D is in the range of 2.4μm≤Ra≤3.0μm, and so on.

[0080] In some embodiments, the maximum absolute value of the roughness difference between any two points on the working surface 121 is ΔR max , and 0.1μm≤ΔR max ≤0.6 μm. Specifically, the maximum absolute value ΔRmax of the roughness difference between any two points on the working surface 121 can be 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, etc.

[0081] Theoretically, the more uniform the surface roughness of the aluminum tube of the developing roller, the better, that is, the roughness difference between any two points is 0, but due to the limitations of the manufacturing process, absolute uniformity is impossible. Within the range that the process can achieve, if the roughness difference between any two points on the working surface 121 is too small, the life of the processing roller will be seriously reduced, making the overall production cost too high. Taking aluminum tube A and aluminum tube B as an example, the roughness range of aluminum tube A is 1.5μm to 2.1μm, and the roughness range of aluminum tube B is 1.8μm to 1.9μm. According to the roughness transfer relationship (which can be determined in actual production), the appropriate roughness of the processing roller surface is determined, and a processing roller with appropriate roughness is used to process aluminum tube A and aluminum tube B. The surface roughness of the processing roller must be greater than the maximum roughness of the aluminum tube. For example, a processing roller C with a roughness of 2.3μm (0.2μm greater than the maximum roughness of aluminum tube A) is selected to process aluminum tube A, and a processing roller D with a roughness of 2.1μm (0.2μm greater than the maximum roughness of aluminum tube B) is selected to process aluminum tube B. Since the minimum roughness of aluminum tube A is 1.5μm, the minimum roughness of aluminum tube B is 1.8μm. In other words, in the quality inspection link, when it is detected that the minimum roughness of the working surface of the produced aluminum tube is lower than 1.5μm, it means that the processing roller is seriously damaged and needs to be replaced. When processing the latter, if it is found that the minimum roughness of the working surface of the produced aluminum tube is lower than 1.8μm, it means that the processing roller is seriously damaged and needs to be replaced. The roughness attenuation over the life of the processing roller can be measured by referring to the difference between the roughness of the processing roller and the minimum roughness of the aluminum tube. This is 0.8μm (2.3μm to 1.5μm) for processing roller C, and 0.3μm (2.1μm to 1.8μm) for processing roller D. It can be seen that the roughness attenuation over the life of processing roller C is greater than that over the life of processing roller D. In other words, the life of processing roller C used to process aluminum tube A is longer than that of processing roller D used to process aluminum tube B. The manufacturing cost of the processing rollers is essentially the same, and the wear and tear of the processing rollers significantly affects the production cost of the developing roller. During the life of the processing roller, the number of aluminum tubes A processed is greater than the number of aluminum tubes B processed. Therefore, the cost per aluminum tube A is less than the cost per aluminum tube B. For example, when the maximum absolute value of the roughness difference between any two points on the working surface of the aluminum tube E is 0.05 μm, the roughness attenuation corresponding to the life of the processing roller will be very small, the number of aluminum tubes that can be processed by one processing roller will be very small, and the production cost of the aluminum tube will be too high.

[0082] In addition, the roughness value of the aluminum tube working surface needs to be selected according to the particle size of the carbon powder. If the surface roughness value is too small, the carbon powder delivery amount is reduced and the image color is light. If the surface roughness value is too large, the carbon powder delivery amount is increased, and the surface of the developing roller is prone to filtering, resulting in carbon powder overflow, and also increasing the amount of powder consumed. Based on the conventional carbon powder particle size, the preferred range of the surface roughness value Ra of the developing roller of this application is [0.9μm, 3.0μm], and the ideal surface roughness value Ra is [1.3μm, 1.9μm], so that the amount of carbon powder carried and the stable adsorption of carbon powder can be achieved to the best effect. This range and ideal value can be changed according to the actual size of the carbon powder particles used. The part of the developing roller of the present application that carries the toner is a working surface with a predetermined roughness value obtained by directly processing the aluminum base on the surface of the aluminum tube. The working surface is a part of the aluminum base. The aluminum base will not be worn during the friction of the developing roller, and the surface roughness value will not decay sharply during use to affect the toner carrying. Therefore, the surface roughness value of the developing roller does not need to be designed to be too large when it is initially put into use, and no toner waste will be caused.

[0083] In some embodiments, the rough surface may be a concave-convex structure with a regular or irregular shape, or the rough surface may be a concave-convex structure with a regular or irregular arrangement.

[0084] Furthermore, the developing roller 1 includes a transmission head and a conductive mechanism, each disposed at either end of the sleeve body. The transmission head is configured to receive an external driving force. The conductive mechanism includes a mounting bracket and a conductive wire, the mounting bracket being mounted at an end of the sleeve body. The conductive wire is mounted on the mounting bracket, one end of the conductive wire being connected to the sleeve body, and the other end of the conductive wire being configured to connect to an external power source, thereby enabling the sleeve body to be connected to the external power source via the conductive mechanism.

[0085] Compared to the graphite resin coating of existing developer rollers, this embodiment utilizes the same material (aluminum) for the working surface 121, the non-working surface 122, and the sleeve body, resulting in excellent wear resistance for the developer sleeve 12. The concave-convex structure of the developer sleeve 12 is prevented from rapid wear from constant friction with toner and scrapers. This ensures minimal change in the roughness of the aluminum tube's working surface over the life of the process cartridge, allowing the initial roughness of the aluminum tube surface to be machined to a moderate value, reducing overall powder consumption. Preferably, the concave-convex structure on the working surface 121 is generated by the transfer of the concave-convex structure from the processing roller to the outer surface of the aluminum developer sleeve during the rolling process of the aluminum developer sleeve. The concave-convex structure is integral with the aluminum developer sleeve, making it stable and secure and preventing separation from the developing sleeve.

[0086] Specifically, the coating on the developer roller that carries toner, typically produced by conventional sandblasting or oil-spraying processes, is formed by attaching other materials to the surface of an aluminum tube. During use, friction causes wear of the coating material, rapidly reducing the surface roughness. To prevent this rapid degradation of the developer roller coating's roughness, which could affect printed image density, the initial surface roughness of the developer roller coating produced using conventional techniques typically exceeds the roughness range required to match the toner particle size. This ensures that the desired image can be produced even at the end of the process cartridge's lifecycle. This also results in excessive toner consumption at the beginning of the lifecycle, causing waste.

[0087] In addition, compared with the prior art, in the preferred embodiment of the present application, the surface of the developing roller aluminum tube is repeatedly rolled by the processing roller to form a working surface with a concave-convex structure, and the surface roughness is relatively uniform. The absolute value of the roughness difference between any two points is within the first threshold range, that is, within the range of [0, 0.6μm], among which [0, 0.3μm] is preferred.

[0088] In this embodiment, the instrument used to measure the roughness Ra of a certain position on the working surface 121 is Mitutoyo SJ.210 from Japan, with an instrument accuracy of 0.001 μm; the instrument used to measure the diameter of the developing roller is Mitutoyo from Japan, with an instrument accuracy of 0.001 mm.

[0089] During the test, test points were selected at the same position on the working surface of different developing rollers. The test points selected in this application are distributed at both ends and the middle of the working surface of the developing roller. Three test points of the developing roller are selected as shown in Figure 4 (points A1, B1, and C1). The roughness Ra values ​​of points A1, B1, and C1 on the same developing roller are tested and recorded using a roughness tester. Developing rollers with different experimental test data are used in the same image forming device for printing tests. The test temperature is 20℃±3℃, the test humidity is 40%RH~80%RH, and the number of printed pages is set to four stages: 0 pages in the initial stage, 100 pages in the first stage, 1000 pages in the second stage, and 2000 pages in the third stage. The changes in the working surface of the developing roller after the printing is completed are tested at different stage nodes, including the changes in the wear value, roughness value, print blackness value, and toner consumption of the developing roller working surface. The wear of the developing roller working surface can be obtained by measuring the diameter of the developing roller working surface at the completion nodes of different printing stages and performing processing calculations. The range of variation in the surface roughness of the developing roller can be obtained by calculating the difference in roughness between the test position with the largest roughness and the test position with the smallest roughness. The range of variation in the black value on the printed paper can be tested using a color density tester. The weight of toner consumed for printing a predetermined number of papers can be measured using an electronic scale. The various data in the experimental tests are recorded. The above data are shown in Table 1-11 below.

[0090] Table 1

[0091] Table 2

[0092] Table 3

[0093] Table 4

[0094] Table 5

[0095] Table 6

[0096] Table 7

[0097] Table 8

[0098] Table 9

[0099] Table 10

[0100] Table 11

[0101] Among them, the above Tables 1 to 10 are data of an embodiment of a developing roller of the present invention, in which the roughness of the working surface of the developing roller ranges from 0.9 μm to 3.0 μm, and Table 11 is data of a comparative example of an existing oil-sprayed / sand-blasted plus coated developing roller, in which the roughness of the rough surface ranges from 1.3 μm to 1.9 μm.

[0102] The roughness of the developing roller working surface in Tables 1 and 2 ranges from 0.9μm to 1.3μm. For developing roller No. 1, as an example, the print test data for developing roller No. 1-1 in Table 1 was collected starting with the initial printing phase of 0 pages, followed by 100 pages in the first phase, 1000 pages in the second phase, and 2000 pages in the third phase. From the first phase to the third phase, the blackness (a measure of print quality) varied from 1.16 to 1.21, the toner consumption varied from 3.2g to 3.7g, and the thickness of the working surface wore from 0.001mm to 0.015mm. In the first phase (same as the initial state), the roughness difference ranged from 0μm to 0.25μm, with a maximum roughness difference of 0.25μm. By the completion of the third phase of printing, the maximum roughness attenuation at each test point was 0.09μm.

[0103] The roughness range of the working surface of the developing roller in Tables 3 to 5 above is 1.3μm to 1.9μm, which is represented by developing roller No. 2. Taking developing roller No. 2-1 in Table 3 as an example, printing test data is performed from 0 pages in the initial printing stage to 100 pages in the first stage, 1000 pages in the second stage, and 2000 pages in the third stage. The blackness change range that characterizes the printing quality is 1.44 to 1.48, the powder consumption change range is 4.1g to 4.9g, the wear range of the working surface thickness is 0.001mm to 0.002mm, and the change in the roughness difference in the first stage (same as the initial state) is 0μm to 0.192μm and the maximum roughness difference is 0.192μm. When the third stage printing test is completed, the maximum roughness attenuation corresponding to each test point is 0.082μm.

[0104] The roughness range of the working surface of the developing roller in Tables 6 to 10 above is 1.9μm to 2.5μm, which is represented by developing roller No. 3. Taking developing roller No. 3-1 in Table 6 as an example, printing test data is performed from 0 pages in the initial printing stage to 100 pages in the first stage, 1000 pages in the second stage, and 2000 pages in the third stage. The blackness change range that characterizes the printing quality is 1.54 to 1.64, the powder consumption change range is 5.0g to 5.6g, the wear range of the working surface thickness is 0.015mm to 0.002mm, and the change in the roughness difference in the first stage (same as the initial state) is 0μm to 0.231μm and the maximum roughness difference is 0.231μm. The maximum roughness attenuation corresponding to each test point is 0.176μm.

[0105] The roughness range of the working surface of the No. 4 developing roller in Table 11 of the prior art is 1.3μm~1.9μm. The printing test data is performed from 0 pages in the initial printing stage to 100 pages in the first stage, 1000 pages in the second stage, and 2000 pages in the third stage. The blackness change range that characterizes the printing quality is 1.19~1.4, the powder consumption change range is 3.4g~5.6g, the wear range of the working surface thickness is 0.003mm~0.008mm, and the roughness difference of the test points in the first stage (same as the initial state) changes from 0μm to 0.353μm and the maximum roughness difference is 0.353μm. The maximum roughness attenuation corresponding to each test point reaches 0.261μm.

[0106] It should be noted that the wear of the working surface thickness is the average of the absolute values ​​of the difference between the diameter of the working surface measured at the end of the printing job and the diameter of the working surface in the initial printing state; the maximum roughness difference refers to the difference between the maximum and minimum roughness values ​​at points A1, B1, and C1; the blackness value is a value that characterizes the printing quality. Generally speaking, a blackness value in the range of 1.4 to 1.5 indicates better printing quality. The roughness attenuation value corresponding to each test point is the attenuation value calculated by the difference between the roughness value of the same test point in the first stage and the roughness value of the third stage.

[0107] In this embodiment, it can be seen from the maximum value of the roughness difference at the test point that the roughness difference of developing rollers No. 1, 2, and 3 can be controlled within the range of 0μm to 0.3μm. However, as the surface roughness value of the working surface continues to increase, for example, the surface roughness of the working surface of developing roller No. 3 exceeds 1.9μm, it can be clearly seen that the printing blackness value and powder consumption also increase accordingly, the printing quality gradually deviates from the optimal range, and the carbon powder consumption also exceeds the powder consumption of developing roller No. 2. When the working surface roughness value is low, that is, when the surface roughness of the working surface of developing roller No. 1 is below 1.3μm, although the powder consumption is reduced, its printing blackness is also greatly reduced, which will affect the printing quality. In order to meet the optimal printing blackness range of 1.4 to 1.5 and less powder consumption, the preferred range of roughness in this application is 1.3μm to 1.9μm.

[0108] The roughness range of the developing roller is set according to the toner commonly used in image forming equipment to match the toner size and transport the toner, resulting in better print quality on the finished product. The preferred working surface roughness range of the developing roller in this application is 1.3-1.9 μm to match the required toner size, effectively transporting toner and ensuring excellent print quality for image printing.

[0109] Printing quality tests and powder consumption tests were conducted on the developer roller of the present application, which preferably has a working surface roughness range of 1.3μm to 1.9μm, and the prior art No. 4 developer roller, which also preferably has a surface roughness of a coating that matches the conventional printing toner size. From a structural point of view, the obvious difference between the developer roller of the present application and the prior art developer roller is that the roughness difference of the test points selected for each developer roller in the embodiment of the present application is all between 0μm and 0.3μm, and the roughness difference of the two test points (B1, C1) with the largest difference in roughness on the developer roller is within the range of 0.1um to 0.3μm. The largest value of the roughness difference between the two test points does not exceed 0.3μm. The difference in roughness of the two test points (A1, C1) of the prior art No. 4 developer roller exceeds 0.3μm. It can be deduced that the maximum value of the roughness difference between any two points on the prior art developer roller exceeds 0.3μm. The maximum value of the roughness difference between any two test points of the developing roller of the present application can be controlled within 0.3 μm. From the test results of multiple embodiments, it can be seen that the surface roughness change of the working surface of the developing roller of the present application is more uniform than that of the developing roller of the prior art, and there is no range exceeding 0.3 μm.

[0110] It should be noted that, as explained in the previous article, controlling the maximum value of the roughness difference between any two points of the developing roller to within 0.1 μm (taking the roughness value range of the developing roller working surface described in the previous article as 1.8 μm to 1.9 μm as an example, the absolute maximum value of the roughness difference is 0.1 μm) is shorter than controlling the maximum value of the roughness difference to within 0.6 μm (taking the roughness value range of the developing roller working surface as 1.6 μm to 2.1 μm as an example, the absolute maximum value of the roughness difference is 0.6 μm). The processing roller life is shorter and the processing cost is higher. Therefore, the preferred embodiment of the present application has the maximum absolute value of the roughness difference on the working surface of the developing roller controlled to above 0.1 μm. On the other hand, based on the requirements of the image forming device for the roughness value of the working surface of the developing roller, the fluctuation of the roughness value at different positions of the working surface of the developing roller in the printing consumables of this field is controlled within 0.6μm to meet the printing requirements of the image forming device. Therefore, when the surface of the aluminum tube of the developing roller is formed with a metal rough surface consistent with its material, the maximum absolute value of the roughness difference on the working surface of the developing roller is controlled within 0.6μm to meet normal printing. In this way, the range of the maximum absolute value of the roughness difference between any two points on the working surface of the developing roller in the embodiment of the present application is

[0111] [0, 1 μm, 0.6 μm], and the absolute value range of the roughness difference between any two points is [0 μm, 0.6 μm]. It should be noted that, based on the preferred characteristics of the printing quality and toner consumption achieved by the developing roller, in the following embodiments, a specific description is given by analyzing and comparing the developing roller No. 2-1 of the developing roller No. 2 of the present application and the developing roller No. 4 of the prior art. The preferred developing roller in the embodiments of the present application has the maximum absolute value of the roughness difference on its working surface controlled to be below 0.3 μm, that is, the preferred range of the maximum absolute value of the roughness difference on the working surface of the developing roller is [0.1 μm, 0.3 μm], and the preferred range of the roughness difference is [0, 0.3 μm].

[0112] The developing roller of the present application forms a rough working surface by processing the metal surface through a stable and unified physical process, and its roughness variation is more uniform. However, the black roller of the prior art is processed through a sandblasting process, and its coating material contains different substances. Combined with the large number of parameter variables of the sandblasting process, the rough coating of the developing roller inevitably exhibits a large roughness variation.

[0113] Further, based on the printing test effect data, printing quality tests and powder consumption tests were conducted. A comparative analysis was conducted between the No. 2 developing roller of the present application and the No. 4 developing roller of the prior art. The absolute maximum value of the roughness difference of the working surface of the No. 2 developing roller of the present application was controlled within 0.3μm, while the maximum value of the coating roughness difference of the No. 4 developing roller of the prior art exceeded 0.3μm. By comparing the printing quality, powder consumption, and wear change values ​​of the working rough surface, although all are within the roughness range required for carrying toner, the developing roller of the present application has better printing performance. Its blackness value is within the range of 1.44 to 1.48, with a small blackness variation range, and both can meet the better printing blackness range of 1.4 to 1.5. This is the blackness value range recognized in the art to reflect better printing quality. While ensuring excellent printing quality, the powder consumption of the developing roller of the present application to complete 100-page printing is within the range of 4.2g to 4.5g. The conventional developer roller has a blackness range of 1.19 to 1.4, with a wide variation in blackness and unstable print quality. Furthermore, when the print blackness reaches 1.4, its powder consumption exceeds the powder consumption of the present developer roller by 5.6g under the same conditions. This is calculated based on the powder consumption per 100 pages. This means that the present developer roller can print more pages with the same toner. If calculated over the entire life of the developer roller, the print volume of the present developer roller will far exceed the number of pages printed by the conventional developer roller. Compared to the conventional developer roller, the present developer roller achieves superior print quality while consuming less powder.

[0114] Furthermore, when the No. 2 developing roller of the present application and the No. 4 developing roller of the prior art were within the same roughness range and subjected to the same printing function test, when printing the same amount of paper, for example, printing 1,000 pages, the No. 2 developing roller of the present application showed a working surface wear of 0.001mm compared to the initial state, while the No. 4 developing roller of the prior art showed a coating wear of 0.003mm compared to the initial state. When printing 2,000 pages, the No. 2 developing roller of the present application showed a working surface wear of 0.002mm compared to the initial state, while the No. 4 developing roller of the prior art showed a coating wear of 0.008mm compared to the initial state. It can be clearly seen that the coating wear of the developing roller of the prior art increases with the increase in the number of printed pages. The wear of the first 1,000 pages was 0.003mm, and the wear of the second 1,000 pages was 0.005mm compared to the first 1,000 pages. During the service life of the developing roller of the prior art, the coating of the developing roller will wear faster as the number of printed pages increases. The wear of the working surface of the developing roller of the present application is within a very stable range. As the number of printed pages increases, the wear of the working surface does not change much for the same number of pages printed, but maintains a consistent trend. The wear of the rough surface of the first 1,000 pages is 0.001mm, and the wear of the second 1,000 pages is still 0.001mm compared to the previous 100 pages. Even for developing rollers with other ranges of roughness values ​​of the rough surface according to the present application, the wear remains at around 0.001mm and does not exceed 0.003mm. The wear of the working surface of the developing roller of the present application does not accelerate with the increase in the number of printed pages, and always remains in an ideal state with less wear. The rough surface on the working surface of the developing roller of the present application is made based on the aluminum base itself. Compared with the rough surface of the coating formed by spraying other materials on the developing roller of the prior art, when printing the same paper, the wear of the rough surface on the working surface of the developing roller of the present application is significantly less than the wear of the coating rough surface of the developing roller of the prior art, having better wear resistance, and can be used for a longer life cycle, thereby reducing costs.

[0115] In addition, after performing the same printing test, the maximum roughness attenuation value on the working surface of the developing roller No. 2-1 of the present application is 0.082μm, while the attenuation value of the developing roller No. 4 of the prior art has reached 0.261μm. The coating roughness attenuation of the developing roller of the prior art is much greater than that of the developing roller of the present application. In actual applications, the rapid attenuation of roughness will greatly affect the quality of printing. If the roughness of the working surface carrying toner is unstable, it will gradually decay into a smooth outer surface and thus cannot properly adsorb and carry toner. The rough surface on the working surface of the developing roller of the present application is based on the roughness formed on the outside of the aluminum tube. Compared with the coating of the developing roller of the prior art with the same roughness, the rough coating of the prior art is easy to wear and fall off. Even after multiple printings, the working surface of the developing roller of the present application still has a significant outstanding roughness stability advantage, and can maintain a stable and effective surface roughness value to perform the printing work of the image forming device and ensure excellent printing quality.

[0116] This application is based on the rough surface of the aluminum layer formed on the surface of the aluminum tube. The rough surface material is stable and the printing quality is not affected by environmental changes (such as temperature changes, humidity changes, etc.).

[0117] With reference to the above experimental data, through repeated experiments by the inventor, while balancing the printing effect (print image quality), powder consumption, and production cost, it is determined that the absolute value of the roughness difference between any two points on the working surface of the developing roller aluminum tube in this application is in the range of 0 to 0.6 μm (end point value is desirable), and the optimal range is 0 to 0.3 μm (end point value is desirable); the maximum value of the absolute value of the roughness difference between any two points is in the range of 0.1 μm to 0.6 μm (end point value is desirable), and the optimal range is 0.1 μm to 0.3 μm (end point value is desirable). Similarly, guided by the above experimental data, the changes in the roughness of the points in the axial and circumferential directions of the working surface of the developing roller will also obtain the above-mentioned value range and preferred value range, that is, the maximum value of the absolute value of the roughness difference between any two points in the axial direction is in the range of 0.1μm~0.6μm (end point value is acceptable), and the optimal range is 0.1μm~0.3μm (end point value is acceptable); the maximum value of the absolute value of the roughness difference between any two points in the circumferential direction is in the range of 0.1μm~0.6μm (end point value is acceptable), and the optimal range is 0.1μm~0.3μm (end point value is acceptable).

[0118] This application utilizes a transfer process to manufacture a developing roller. The process primarily involves first processing a rough structure onto a transfer device, then transferring the rough structure onto the developing roller via the transfer device to form a working surface with a predetermined surface roughness value. By controlling the rough structure of the transfer device and utilizing consistent process parameters to batch-process developing rollers, the finished product achieves consistent quality. Compared to existing methods for processing developing rollers using oil-jet and sandblasting, the present process is environmentally friendly, stable, and cost-effective, resulting in superior finished developing rollers. When the transfer device processes the developing device, the service life of the rough structure on the transfer device is affected by the surface roughness value and roughness difference of the developing roller's working surface. For example, the higher the required surface roughness value of the developing roller's working surface, the fewer developing rollers can be produced using the transfer device with the same roughness value. The lower the required surface roughness value of the developing roller's working surface, the more developing rollers can be produced using the transfer device with the same roughness value. Furthermore, the lower the surface roughness value of the processed developing roller's working surface, the smaller the surface roughness difference. Based on the above description, in order to obtain a surface roughness value that matches the size of the toner particles to more effectively carry the toner, pursue a smaller surface roughness difference to achieve high-quality printing, and maximize the use of the service life of the transfer equipment to reduce costs, this application aims to find an optimal balance point to achieve the best effect. The preferred embodiment of this application achieves the above purpose.

[0119] According to imaging principles, the uneven structure and roughness of the developing roller's developing sleeve surface affect toner transport and charge, directly impacting the amount of toner adsorbed onto the photosensitive drum for imaging, and thus affecting image density uniformity. Compared to developing rollers formed using conventional oil-spraying processes, the uneven structure of the working surface of the developing roller in this embodiment, which adsorbs toner, is formed using aluminum itself to a predetermined roughness, rather than a rough coating formed by spraying other materials. This working surface exhibits superior wear resistance compared to coatings formed from graphite and resin. Even after repeated printing cycles, the uneven structure of the working surface remains intact due to friction during the printing process, thus maintaining consistent toner adsorption. The uniform roughness also ensures consistent toner charge across different areas.

[0120] This embodiment determines from different angles that the concave and convex areas of the developing roller that adsorb toner are uniform in structure and roughness, so that the surface of the developing roller can stably and evenly carry toner, and at the same time make the toner charge in different areas consistent, so that the printed image concentration is uniform, ensuring the quality of printed copies.

[0121] In addition to the wear resistance and roughness of the uneven surface of the developer roller and developer sleeve, which absorbs toner, the outer diameter runout of the developer roller during rotation also affects toner transport. To achieve high-definition image formation, the developer roller and photosensitive drum must maintain a fixed relative position. Ideally, the outer diameter runout of the developer roller's aluminum tube is zero. However, due to tolerances in manufacturing, this can cause outer diameter runout. During the coating process for the developer roller's aluminum tube, the standard outer diameter runout is typically 0.00 to 0.03mm. However, due to the continuous reciprocating rotation of traditional oil or sandblasting processes, which typically utilize pneumatic double-blasting, this runout can easily increase. If the outer diameter runout increases, the distance between the developer roller and the photosensitive drum will change as the developer roller rotates. Due to this distance fluctuation, the electric field force exerted by the developer roller on the charged toner cannot stably transport the toner to the photosensitive drum, affecting the movement of toner from the developer roller to the photosensitive drum and ultimately resulting in uneven image density.

[0122] This embodiment not only forms a rough surface on the surface of the developing sleeve through transfer processing, but also corrects the original outer diameter runout value to improve the stability of the outer surface of the developing roller, improves the stability of toner transportation during the imaging process, and thus ensures the uniformity of image concentration.

[0123] The specific processing process of the working surface involves rolling the outer surface of the sleeve body of the developing roller with a processing roller group to form a rough surface, and the concave-convex structure on the rough surface is transferred from the processing rollers. Specifically, the processing roller group includes multiple processing rollers, which are treated with sandblasting and hardening processes to obtain a surface with high hardness and roughness. The processing rollers in the same group are treated with consistent sandblasting and hardening process parameters, so that after processing, a processing area with a first roughness is formed on the surface of each processing roller, and the roughness of the first roughness is greater than or equal to the maximum roughness of the working surface. The processing area of ​​the same processing roller group is brought into contact with the surface to be processed of the developing roller to be processed. Preferably, the processing rollers in the same group are evenly distributed around the circumference of the developing roller surface. A predetermined pressure and rotational driving force are applied to one or more of the processing rollers to rotate the processing rollers in the same direction and drive the developing roller to rotate. After a predetermined number of rotations, the roughened surfaces of the processing rollers and the surface to be processed of the developing roller are rolled together multiple times, forming a working surface with a preset roughness on the surface of the aluminum tube of the developing roller. The pressure, rotational driving force, and number of revolutions applied to the processing roller can be adjusted based on the surface roughness requirements of the developing roller. The processing roller can be used multiple times to process the developing roller to obtain the developing roller of the present application. The surface of the developing roller is processed through a purely physical process to obtain a developing roller that meets preset conditions. No environmentally harmful chemicals are used or produced, making the processing method environmentally friendly. Furthermore, the processing method has a corrective effect on the incoming developing roller material to be processed. After the incoming material enters the processing assembly for rolling, the outer diameter runout of the developing roller aluminum tube is corrected to a preset range, suppressing the bending of the developing roller shaft core and changes in the inner and outer diameters, thereby meeting the deviation accuracy requirements for the formation of high-precision images.

[0124] As shown in Figure 3, in this embodiment, the processing roller group includes three processing rollers 2, and the three processing rollers 2 are spaced apart in the circumferential direction to form a processing area for accommodating the developing sleeve 12. For example, the line connecting the axes of the three processing rollers 2 on the same cross-section forms an equilateral triangle or an isosceles triangle.

[0125] To ensure stable adsorption of toner on the working surface of the developer roller, i.e., the area with the concavo-convex structure, the roughness error range must be precisely controlled. The developer roller to be processed is rotated by a set of processing rollers under a predetermined pressure. In this embodiment, the set of processing rollers comprises three, contacting the outer surface of the developer roller at equal or unequal intervals. A first pressure can be applied to any one or more of the processing rollers. In this application, the first pressure is applied to the processing rollers at the vertices of the triangle. The roughened area of ​​the processing roller contacts the surface of the developer roller to be processed. After multiple full contact cycles of rolling, a suitable roughness working area is formed on the contact surface of the developer roller. The rough pattern on the processing roller surface is evenly replicated on the working area of ​​the developer roller to form a predetermined rough surface. The predetermined rough surface is formed with a concavo-convex structure. The shape of the concavo-convex structure on the rough surface can be regular or irregular, and the arrangement of the concavo-convex structure can be regular or irregular. The characteristics of the concavo-convex structure are affected by the rough pattern on the processing roller surface and can be controlled based on the setting of the rough pattern on the processing roller surface. The absolute value of the roughness difference between any two points in the working area of ​​the developer roller is within the first threshold range [0, 0.6μm]. For example, the roughness difference between any two points at the farthest edge or the center of the working area is measured and controlled within the first threshold, fully ensuring the uniformity and stability of the surface roughness of the working area, ensuring a stable and uniform amount of developer absorbed by the surface. The roller-pressed developer roller is subjected to uniform force, and its outer diameter runout can be corrected. If this cannot be corrected or if the developing sleeve of the developer roller to be processed has impurities or other defects on its surface, such as a substandard diameter, and if the working area of ​​the developed roller surface after roller pressing has visible defects such as bright spots, the developed roller can be easily identified as defective and directly removed, further improving the quality of the finished developer roller.

[0126] The rough surface is directly formed on the aluminum tube of the developing roller through rolling processing without adding other materials. During repeated use, the rough material will not be reduced due to wear. The roughness of the developing roller will not change significantly after long-term use. The amount of toner carried is always maintained at a stable value, effectively ensuring the uniformity and quality of the printed image.

[0127] Rolling the surface of the aluminum tube to form a rough working surface for carrying carbon powder is a purely physical processing method. On the one hand, the ambient temperature during the processing is maintained within a stable range, and high temperatures will not be generated to cause deformation of the developing roller components. For example, the transmission head assembled before the surface processing will not be deformed by the subsequent rolling process and affect the quality of the developing roller. Compared with the spraying and sandblasting process, high-temperature baking is a necessary step when spraying the rough coating of the developing sleeve. In order to avoid the deformation of the developing roller components caused by high-temperature baking, the coating process must be completed in the spraying process to prepare the coating before the transmission head can be assembled. The rolling processing method does not require the use of any chemical reagents used in oil spraying and sandblasting, does not produce any harmful substances, and will not have a harmful effect on the environment and human body.

[0128] In order to remove burrs on the two end faces of the aluminum tube and to facilitate the assembly of parts, chamfers are generally made on the ends of the parts. In a preferred embodiment, the developing roller formed by rolling processing in this application can be first assembled with a transmission head, which can be a metal head or a plastic head. After assembly, the outer edge of the aluminum tube is polished, and the burrs on the outer edge are removed during the polishing process. During the processing of the developing roller, there is no need to perform chamfering on the outer edge of the developing roller end. The end member can be directly embedded in the end of the developing roller and fixed. Therefore, both ends of the developing sleeve body of this embodiment do not need to be chamfered.

[0129] The traditional process of processing the rough surface of the developing roller by sandblasting and oil spraying is a complicated process. If chamfering is not performed, it will affect the assembly of the fixture for oil spraying or sandblasting, and some aluminum chips will be mixed into the oil coating due to the pressure of the wind. The process requires chamfering, lathing or polishing the outer edge, and then coating. After baking, the transmission plastic head can be assembled. Therefore, in the process of preparing the coating by the existing commonly used spraying and sandblasting process, chamfering must be performed first and the transmission head cannot be assembled first. The required chamfering structure must be made at the end of the developing roller to complete the assembly of the developing roller normally. In the method of rolling the developing roller involved in the present technical solution, the chamfering step can be omitted, which further saves production costs and simplifies the processing flow, and has high processing efficiency; the developing roller product produced has a simpler structure.

[0130] It should be noted that omitting the chamfer structure simplifies the processing technology and structure of the developing roller, but in order to improve other assembly efficiency of the developing roller, the chamfer structure at the end of the developing roller can also be retained. The chamfer structure can be set at any end of the developing roller or at both ends. The chamfer can be processed and set according to actual assembly requirements.

[0131] Accordingly, an embodiment of the present application further discloses a method for processing a developing roller, which is used to process the developing roller described in the above embodiment. The method for processing the developing roller includes:

[0132] S11, controlling the processing roller to apply a predetermined pressure to the outer surface of the sleeve body of the developing roller.

[0133] S12, controlling the rotation of the processing roller to drive the sleeve body to rotate a preset number of circles, so that the concave-convex structure of the processing roller is transferred to the outer surface of the sleeve body, so that the outer surface of the sleeve body forms a working surface with a preset roughness.

[0134] Specifically, at least one processing roller assembly applies a predetermined pressure to the outer surface of the sleeve body of the developer roller, and the sleeve body is rotated a predetermined number of times by the rotation of the at least one processing roller assembly, so that the concave-convex structure of the at least one processing roller assembly is transferred to the outer surface of the sleeve body, thereby forming a working surface with a predetermined roughness on the outer surface of the sleeve body. Each processing roller assembly includes a plurality of processing rollers, which are spaced apart along the circumference and enclose a processing area for accommodating the sleeve body. The roughness of the outer surface of the processing roller is greater than or equal to the predetermined roughness of the working surface of the developer roller sleeve to be processed.

[0135] The values ​​of the aforementioned predetermined pressure and preset number of turns can be determined based on the parameter requirements of the magnetic roller to be processed. The number of processing roller groups can be determined based on actual processing needs. For example, one processing roller group can be used to process the developing roller sleeve, or two, five or more processing roller groups can be used to process multiple developing roller sleeves at the same time, thereby improving processing efficiency. In addition, when multiple processing roller groups are used to process the developing roller sleeve, the number of processing rollers contained in each processing roller group can be the same or different. Preferably, the processing roller group includes three processing rollers, and the three processing rollers are spaced apart in the circumferential direction to form a processing area for accommodating the sleeve body. The connecting line of the axes of the three processing rollers on the same cross section forms an equilateral triangle or an isosceles triangle.

[0136] An embodiment of the present application also discloses a processing box, which includes a photosensitive drum, a powder bin, a waste powder bin and the developing roller mentioned above. The photosensitive drum is installed in the waste powder bin, and the developing roller is installed in the powder bin. The processing box is installed in a printer to provide consumables for the printer for printing.

[0137] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A developing roller, characterized in that, Comprising: A magnetic core; A developing sleeve, the material of the developing sleeve being metal, the developing sleeve being sleeved on the magnetic core, and the developing sleeve including a sleeve body and a working surface, the working surface being located on the outer surface of the sleeve body, and the working surface and the sleeve body being integrally formed and of the same material; Wherein, the working surface is provided as a rough surface with a concavo-convex structure and is used for carrying toner; the absolute value of the difference in roughness between any two points on the working surface is ΔR1, and 0 ≤ ΔR1 ≤ 0.6 μm.

2. The developing roller according to claim 1, wherein The absolute value of the difference in roughness between any two points on the working surface is 0 ≤ ΔR1 ≤ 0.3 μm.

3. A developing roller, characterized in that, Comprising: A magnetic core; A developing sleeve, the material of the developing sleeve being metal, the developing sleeve being sleeved on the magnetic core, and the developing sleeve including a sleeve body and a working surface, the working surface being located on the outer surface of the sleeve body, and the working surface and the sleeve body being integrally formed and of the same material; Wherein, the working surface is a rough surface with a concave-convex structure and is used for carrying toner; the maximum absolute value of the difference in roughness between any two points on the working surface is ΔR max , and 0.1μm ≤ ΔR max ≤ 0.6μm.

4. The developing roller according to claim 3, wherein, The ΔR max satisfies: 0.1 μm ≤ ΔR max ≤ 0.3 μm.

5. A developing roller, characterized in that, Comprising: A magnetic core; A developing sleeve, the material of the developing sleeve being metal, the developing sleeve being sleeved on the magnetic core, and the developing sleeve including a sleeve body and a working surface, the working surface being located on the outer surface of the sleeve body, and the working surface and the sleeve body being integrally formed and of the same material; Wherein, the working surface is provided as a rough surface with a concavo-convex structure and is used for carrying toner; the absolute value of the difference in roughness between any two points on the working surface in the axial direction of the developing sleeve is ΔR2, the absolute value of the difference in roughness between any two points on the working surface in the circumferential direction of the developing sleeve is ΔR3, and, 0 ≤ ΔR2 ≤ 0.6 μm; 0 ≤ ΔR3 ≤ 0.6 μm.

6. The developing roller according to claim 5, wherein, The absolute value of the difference in roughness ΔR2 between any two points on the working surface in the axial direction of the developing sleeve satisfies: 0 ≤ ΔR2 ≤ 0.3 μm; and / or The absolute value of the difference in roughness ΔR3 between any two points on the working surface in the circumferential direction of the developing sleeve satisfies: 0 ≤ ΔR3 ≤ 0.3 μm.

7. The developing roller according to claim 1 or 3 or 5, characterized in that, The roughness value Ra of the working surface, and 0.9 μm ≤ Ra ≤ 3.0 μm.

8. The developing roller according to claim 7, wherein The roughness value Ra of the working surface satisfies: 1.3 μm ≤ Ra ≤ 1.9 μm.

9. The developing roller according to claim 1 or 3 or 5, characterized in that, No chamfers are provided at both ends of the sleeve body.

10. The developing roller according to claim 1 or 3 or 5, characterized in that, At least one end of the sleeve body is provided with a chamfer.

11. The developing roller according to claim 1 or 3 or 5, characterized in that, The developing roller further includes a driving head and a conductive mechanism respectively provided at both ends of the sleeve body, the driving head being used for receiving an external driving force, and the conductive mechanism being used for connecting the sleeve body to an external power source.

12. The developing roller according to claim 11, wherein, The conductive mechanism includes a mounting bracket and a wire; the mounting bracket is mounted at the end of the sleeve body; the wire is mounted on the mounting bracket, one end of the wire is connected to the sleeve body, and the other end of the wire is used for connecting to the external power source.

13. The developing roller according to claim 1 or 3 or 5, characterized in that, The materials of both the sleeve body and the working surface are aluminum.

14. The developing roller according to claim 1 or 3 or 5, characterized in that, The shape of the concavo-convex structure of the rough surface is regular or irregular.

15. The developing roller according to claim 1 or 3 or 5, characterized in that, The concavo-convex structure of the rough surface is arranged regularly or irregularly.

16. The developing roller according to claim 1 or 3 or 5, characterized in that, The rough surface is formed by rolling the outer surface of the sleeve body with a processing roller, and the concavo-convex structure on the rough surface is produced by transfer printing of the processing roller.

17. The developing roller according to claim 16, characterized in that, During the process that the concavo-convex structure of the rough surface applies a predetermined pressure to the outer surface of the sleeve body by the processing roller and drives the sleeve body to rotate a preset number of turns, it is transferred from the processing roller to the outer surface of the sleeve body, so that the rough surface has a preset roughness.

18. The developing roller according to claim 16, wherein, The rough surface is formed by jointly rolling the outer surface of the sleeve body by a set of processing rollers. Wherein, the set of processing rollers includes a plurality of processing rollers, and the plurality of processing rollers are spaced apart along the circumferential direction and enclose a processing area for accommodating the sleeve body.

19. The developing roller according to claim 18, characterized in that, The set of processing rollers includes three processing rollers, and the three processing rollers are spaced apart along the circumferential direction and enclose a processing area for accommodating the sleeve body.

20. The developing roller according to claim 19, characterized in that, The connection lines of the centers of the three processing rollers on the same cross-section form an equilateral triangle or an isosceles triangle.

21. The developing roller according to claim 16, characterized in that, The roughness of the outer surface of the processing roller is greater than or equal to the preset roughness of the working surface.

22. A processing cartridge, characterized in that, It includes a photosensitive drum, a powder bin, a waste powder bin and a developing roller according to any one of claims 1-21. The photosensitive drum is installed on the waste powder bin, and the developing roller is installed on the powder bin.

23. A processing method of a developing roller, characterized in that, It includes: Controlling the processing roller to apply a predetermined pressure to the outer surface of the sleeve body of the developing roller; Controlling the rotation of the processing roller to drive the sleeve body to rotate a preset number of turns, so that the concavo-convex structure of the processing roller is transferred to the outer surface of the sleeve body, so that a working surface with a preset roughness is formed on the outer surface of the sleeve body; Wherein, the absolute value of the difference in roughness between any two points on the working surface is ΔR1, and 0≤ΔR1≤0.6μm; or The absolute value of the difference in roughness between any two points on the working surface located in the axial direction of the developing sleeve is ΔR2, and the absolute value of the difference in roughness between any two points on the working surface located in the circumferential direction of the developing sleeve is ΔR3. And, 0≤ΔR2≤0.6μm; 0≤ΔR3≤0.6μm; Or The maximum absolute value of the difference in roughness between any two points on the working surface is ΔR max , and 0.1μm ≤ ΔR max ≤ 0.6μm.

24. The processing method according to claim 23, wherein Applying a predetermined pressure to the outer surface of the sleeve body of the developing roller by at least one set of processing rollers, and driving the sleeve body to rotate a preset number of turns by controlling the rotation of at least one set of the processing rollers, so that the concavo-convex structure of at least one set of the processing rollers is transferred to the outer surface of the sleeve body, so that a working surface with a preset roughness is formed on the outer surface of the sleeve body. Wherein, the set of processing rollers includes a plurality of processing rollers, and the plurality of processing rollers are spaced apart along the circumferential direction and enclose a processing area for accommodating the sleeve body.

25. The processing method according to claim 24, characterized in that, The set of processing rollers includes three processing rollers, and the connection lines of the centers of the three processing rollers on the same cross-section form an equilateral triangle or an isosceles triangle.

26. The processing method according to claim 23, characterized in that, The roughness of the outer surface of the processing roller is greater than or equal to the maximum value of the roughness of the working surface.

Images