Developing roller, processing box and developing roller processing method

Abstract

The present application discloses a developing roller, a processing box and a processing method for a developing roller, wherein the developing roller comprises a magnetic core and a developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and 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, the working surface is set as a rough surface with a concave-convex structure, and is used to carry carbon powder, and the absolute value of the roughness difference between any two points on the working surface is ΔR1, and 0≤ΔR1≤0.6μm. The roughness of the working surface of the developing roller of the present application is relatively uniform, so that the surface of the developing roller can stably and evenly carry carbon powder, and at the same time, the carbon powder charge in different regions is consistent, so that the density of the printed image is uniform, and the photocopying quality of the printed product is guaranteed.

Description

Technical Field

[0001] 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

[0002] During the laser printing process, the coating on the developing roller and developing sleeve directly contacts with the toner to transport the toner. Therefore, the quality of the coating will affect the carrying capacity and charge of the toner, which will directly affect the quality of the developing image. The requirements for the coating on the developing roller surface should have good conductivity, good wear resistance, adhesion and surface roughness, so that it is conducive to the transmission of toner.

[0003] 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 image concentration. Summary of the invention

[0004] 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.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical solutions:

[0006] In a first aspect, the present application provides a developing roller, the developing roller comprising:

[0007] Magnetic core;

[0008] A developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and the developing sleeve comprises a sleeve body and a working surface, 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;

[0009] 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.

[0010] In some embodiments, the absolute value of the roughness difference between any two points on the working surface is 0≤ΔR1≤0.3 μm.

[0011] In a second aspect, the present application further provides a developing roller, the developing roller comprising:

[0012] Magnetic core;

[0013] A developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and the developing sleeve comprises a sleeve body and a working surface, 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;

[0014] 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.

[0015] In some embodiments, the ΔR max Satisfy: 0.1μm≤ΔR max ≤0.3μm.

[0016] In a third aspect, the present application further provides a developing roller, the developing roller comprising:

[0017] Magnetic core;

[0018] A developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and the developing sleeve comprises a sleeve body and a working surface, 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;

[0019] 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, 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,

[0020] 0≤ΔR2≤0.6μm;

[0021] 0≤ΔR3≤0.6μm.

[0022] In some embodiments, the absolute value ΔR2 of the 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

[0023] An absolute value ΔR3 of the roughness difference between any two points on the working surface located in the circumferential direction of the developing sleeve satisfies: 0≤ΔR3≤0.3 μm.

[0024] In some embodiments, the roughness value of the working surface is Ra, and 0.9 μm≤Ra≤3.0 μm.

[0025] In some embodiments, the roughness value Ra of the working surface satisfies: 1.3 μm≤Ra≤1.9 μm.

[0026] In some embodiments, no chamfer is provided at both ends of the sleeve body.

[0027] In some embodiments, at least one end of the sleeve body is chamfered.

[0028] 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.

[0029] In some embodiments, the conductive mechanism includes a mounting bracket and a wire; the mounting bracket is mounted on 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 to connect to the external power supply.

[0030] In some embodiments, the sleeve body and the working surface are both made of aluminum.

[0031] In some embodiments, the concavo-convex structure of the rough surface has a regular shape or an irregular shape.

[0032] In some embodiments, the concavo-convex structure of the rough surface is arranged regularly or irregularly.

[0033] In some embodiments, the rough surface is formed by rolling the outer surface of the sleeve body with a processing roller, and the concave-convex structure on the rough surface is generated by transfer printing of the processing roller.

[0034] 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.

[0035] In some embodiments, the rough surface is formed by rolling the outer surface of the sleeve body together with a processing roller group, wherein the processing roller group includes a plurality of processing rollers, and the plurality of processing rollers are spaced apart in a circumferential direction to form a processing area for accommodating the sleeve body.

[0036] In some embodiments, the processing roller set 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.

[0037] 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.

[0038] 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.

[0039] In a fourth aspect, the present application further 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, wherein the photosensitive drum is installed in the waste powder bin, and the developing roller is installed in the powder bin.

[0040] In a fifth aspect, the present application also provides a method for processing a developing roller, the processing method comprising:

[0041] Controlling the processing roller to apply a predetermined pressure to the outer surface of the sleeve body of the developing roller;

[0042] Controlling the processing roller to rotate 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;

[0043] in,

[0044] The absolute value of the roughness difference between any two points on the working surface is

[0045] ΔR1, and 0≤ΔR1≤0.6μm; or

[0046] 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

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Compared with the prior art, the developing roller of the present application includes a magnetic core and a developing sleeve, the developing sleeve is sleeved on the magnetic core, and the developing sleeve includes a sleeve body and a working surface, 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 metal, the working surface is set as a rough surface with a concave-convex structure, and at least part of the working surface is used to carry carbon powder, so during the working process of the developing roller, the working surface used to carry carbon powder is not easy to be worn, the stability of the quality of the developing roller is improved, and the quality of printed matter is improved. And because the roughness of the working surface of the developing roller changes little during the entire life cycle of the processing box, the overall powder consumption is reduced.

[0052] In addition, the absolute value of the roughness difference between any two points on the working surface for carrying toner is ΔR1, which satisfies 0≤ΔR1≤0.6μm, or the absolute value of the roughness difference between any two points on the working surface for carrying toner in the axial direction and the circumferential direction of the developing sleeve is ΔR2 and ΔR3, respectively, and satisfies 0≤ΔR2≤0.6μm and 0≤ΔR3≤0.6μm. That is, the roughness of the working surface for carrying toner is relatively uniform, so that the surface of the developing roller can stably and evenly carry toner, and at the same time, the toner charge in different areas is consistent, so that the printed image density is uniform, and the photocopying quality of the printed product is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A three-dimensional diagram of a processing box provided in an embodiment of the present application.

[0054] Figure 2 This is a schematic diagram of the structure of the developing roller provided in an embodiment of the present application.

[0055] Figure 3 A three-dimensional view of the processing roller assembly provided in an embodiment of the present application.

[0056] Figure 4 This is a schematic diagram of the structure of the developing roller provided in an embodiment of the present application.

[0057] Figure ID:

[0058] 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 solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more, and the term "multiple" refers to two or more; the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be 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 ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to 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 at the angles 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 also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" 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 distance) between two peaks or two valleys is very small (less than 1 mm), which belongs to the microscopic geometric shape error. Surface roughness is generally formed by the processing method adopted 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 currently common devices used in offices and homes. The processing box can be detachably installed in the printer body and driven by the printer to provide toner for the printer. The processing box mainly includes a photosensitive drum, a developing roller, a powder bin shell and a waste toner bin shell. The photosensitive drum is installed in the waste toner bin shell, and the developing roller is installed in the powder bin shell. For the magnetic developing roller, it includes a magnetic core and a developing sleeve. The developing sleeve is made of metal and coated with a coating. The coating needs to have certain conductivity, wear resistance and roughness.

[0064] The developing roller is an important component for carrying toner. When working, the magnetic core does not rotate, but the developing sleeve rotates around the axis. The toner supplied from the powder bin will be adsorbed on the surface of the developing sleeve of the developing roller due to the magnetic force of the magnetic core. The toner on the developing sleeve is charged with static electricity through the friction with the coating of the developing sleeve and the powder knife, and forms a uniform thin layer of toner on the surface of the developing sleeve, which rotates with the developing sleeve. When the developing roller rotates while carrying toner, on the one hand, the toner is charged with static electricity and is affected by the electric field force of the metal developing sleeve. On the other hand, the toner is also bound to the surface of the developing sleeve of the developing roller by the magnetic force of the magnetic core of the developing roller. The directions of the magnetic force and electric field force on the toner are opposite. The magnitude of the magnetic force is uniform and constant, but the magnitude of the electric field force changes according to the charging voltage of the developing roller. When the charging voltage of the developing roller is high, the electric force on the toner is greater than the magnetic force, and the toner will break away from the developing roller and fly out. When the charging voltage of the developing roller is low, the electric force on the toner is less than the magnetic force, and the toner will be bound by the magnetic force and return to the surface of the developing sleeve of the developing roller. In the process of transporting toner, the positional relationship between the developing roller and the photosensitive drum is maintained with a certain accuracy. The rotating shaft of the developing sleeve of the developing roller is fixed in the processing box by the positioning member to rotate freely. When the developing roller carries the toner and rotates to a certain distance from the photosensitive drum, the toner on the surface of the developing roller is adsorbed to the electrostatic latent image formed on the surface of the photosensitive drum by laser irradiation under the action of the magnetic force of the magnetic core, the electric force of the developing roller and the electric force of the photosensitive drum, and the development is completed. After that, the visible image formed on the surface of the photosensitive drum is transferred to the paper, and then cured to the paper by the printer after heating and pressurization.

[0065] During the laser printing process, the coating on the developing roller and developing sleeve directly contacts with the toner to transport the toner. Therefore, the quality of the coating will affect the carrying capacity and charge of the toner, which will directly affect the quality of the developing image. The requirements for the coating on the developing roller surface should have good electrical properties, as well as good wear resistance, adhesion and surface roughness to facilitate the transmission of toner.

[0066] If the coating surface of the developing roller and developing sleeve is too rough, such as defective areas and dirt, it will cause periodic dots, lines and patches on the printed page. If the coating on the developing roller is too thin, it will be unfavorable for the transmission of toner and it will be difficult to establish a good toner layer. Then the printing quality produced by such a developing roller will be very shallow, and the deep wear lines in the circumferential direction will cause vertical white lines on the printer page. The poor surface of the developing roller will cause serious ghosting of the printed product.

[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 in a stable and even manner. This places precision requirements on the outer circumferential 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 the developing roller is usually a round sleeve formed of metal, alloy or compound, and a processing technology is used to form a conductive coating on the sleeve surface to achieve a predetermined roughness, so that the carbon powder can be stably and reliably transported 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. As the material of the developing sleeve of the developing roller, aluminum, brass, stainless steel, and conductive resin can be used, but considering the cost and precision, aluminum is generally used. The aluminum tube of the developing sleeve of the developing roller made of aluminum is usually formed into a cylindrical blank with the required inner and outer diameters by extrusion, rough drawing and straightening, and the cylindrical blank is cut into an aluminum tube of a preset length, and a flange component is pressed into the end of the aluminum tube, such as turning, centerless grinding, etc., and then after a cleaning and baking process, the surface of the aluminum tube is coated to obtain the required surface roughness. When the aluminum developing sleeve is subjected to surface processing, the traditional method is to spray oil or sandblast on the aluminum base to form a conductive coating. Taking the oil spraying process as an example, first of all, it is necessary 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 many times. After high-temperature curing and polishing, a coating with a certain roughness is formed on the developing sleeve. The surface of the coating has a certain concave-convex structure to absorb toner. When the surface of the coating reaches a certain roughness, it can rub against the toner and the scraper to make the toner carry static electricity, so that the developing roller can transport the toner to the photosensitive drum to complete the printing task.

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

[0071] The surface roughness of the developing roller and developing sleeve formed by the oil spraying process has a large error range in different areas. The dispersion of the solid particles in the conductive coating is often insufficient, making it difficult to obtain a rough surface with uniform roughness. The roughness value of the coating has a large error in different areas. Because synthetic oil is sprayed in mass production, the surface roughness value of the developing roller produced by the same batch of spraying process has a large deviation, and the coatings sprayed in different batches make the quality of the developing roller more different. On the same developing roller surface, due to the different roughness, the toner carried at different positions is uneven, the charge amount varies greatly, and the blackness value on the printed page is uneven, which in turn affects the printing quality.

[0072] The developer roller surface will deform after oil or sandblasting, which will have a negative impact on its rotation. Excessive outer diameter runout of the developer roller can cause fluctuations in the gap between the developer sleeve and the photosensitive drum, which can lead to unstable developer supply to the photosensitive drum and then lack of proper toner concentration on the formed image. At the same time, the environmental hazards and human health effects of the coating preparation materials used in the spraying process, such as acetone, cannot be ignored.

[0073] Furthermore, the coating material of the developer sleeve produced by the oil injection process has poor wear resistance, so the concave-convex structure of the developer sleeve coating is quickly worn out in the constant friction with the toner and the scraper, the roughness is reduced, the amount of adsorbed toner is reduced, and the printed image finally becomes lighter. In order to ensure that in the later period of the life cycle of the processing cartridge, even if the concave-convex structure is severely worn, the printed image becomes lighter within an acceptable range, it is necessary to process the initial roughness of the concave-convex structure of the developer sleeve coating to be very large. However, in this way, the developer roller will carry a large amount of toner to participate in the work in the early stage of the use of the processing cartridge, which increases the toner consumption.

[0074] In order to solve the problem that the graphite resin coating of the prior art developing roller is easily worn out during long-term use, when the concave-convex structure of the coating is worn out, the amount of carbon powder adsorbed becomes less, the coating roughness is uneven, and the developing roller cannot stably transport the carbon powder, the formed image density is greatly affected, and the printing quality is poor. The invention purpose of this application is to prepare a developing roller with good wear resistance, the coating of the developing roller is not easily worn out due to friction during the transportation of carbon powder, and the carbon powder is stably adsorbed on the surface of the developing roller and can be transported evenly and reliably.

[0075] Reference Figure 1 and Figure 2As shown, 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 installed in the waste powder bin, and the developing roller 1 is installed 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 carbon powder. The working surface 121 is located on the outer surface of the sleeve body, and the working surface 121, the non-working surface 122 and the sleeve body are integrally formed and made of the same material. The working surface 121 is set as a rough surface with a concave-convex structure, and the non-working surface 122 is set 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 the present embodiment, the developing sleeve 12 is made of aluminum, i.e., 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 being rolled with a processing roller, and may 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 may 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 respectively 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 on the working surface 121 in the axial direction of the developing sleeve 12 and the roughness Ra on the circumferential direction may be the same or different. Among them, 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 conditions: 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 conditions: 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 range of the working surface of product A is 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 range of the working surface of product B is 1.0 μm ≤ Ra ≤ 1.6 μm. For another example, the roughness Ra range of the working surface of product C is 1.3 μm ≤ Ra ≤ 1.9 μm. The roughness Ra range of the working surface of product D is 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 may 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 examples, 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. Determine the appropriate roughness of the processing roller surface based on the roughness transfer relationship (which can be determined in actual production), and use a processing roller with a suitable roughness to process aluminum tube A and aluminum tube B. The surface roughness of the processing roller should be greater than the maximum roughness of the aluminum tube. For example, select processing roller C with a roughness of 2.3μm (0.2μm greater than the maximum roughness of aluminum tube A) to process aluminum tube A, and select processing roller D with a roughness of 2.1μm (0.2μm greater than the maximum roughness of aluminum tube B) 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 severely 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 severely damaged and needs to be replaced. The roughness attenuation corresponding to 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. The roughness attenuation corresponding to the life of the processing roller C is 0.8μm (2.3μm~1.5μm), and the roughness attenuation corresponding to the life of the processing roller D is 0.3μm (2.1μm~1.8μm). It can be seen that the roughness attenuation corresponding to the life of the processing roller C is greater than the roughness attenuation corresponding to the life of the processing roller D. In other words, the life of the processing roller C for processing aluminum tube A is longer than the life of the processing roller D for processing aluminum tube B. The manufacturing cost of the processing roller is basically the same, and the loss of the processing roller will significantly affect the production cost of the developing roller. During the life of the processing roller, the number of processed aluminum tubes A is greater than the number of processed aluminum tubes B, so 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 is very small, and the production cost of the aluminum tube is too high.

[0082] In addition, the roughness value of the working surface of the aluminum tube 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 will be reduced and the image color will be light. If the surface roughness value is too large, the carbon powder delivery amount will increase, and the surface of the developing roller will be easily filtered, resulting in carbon powder overflow, and the powder consumption will also increase. 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 surface of the aluminum tube based on the aluminum base. 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 dramatically 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 shape or an irregular shape, or the rough surface may be a concave-convex structure with a regular arrangement or an irregular arrangement.

[0084] Furthermore, the developing roller 1 further comprises a transmission head and a conductive mechanism, which are respectively arranged at both ends of the sleeve body, and the transmission head is used to receive an external driving force. The conductive mechanism comprises a mounting bracket and a wire, the mounting bracket is mounted on 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 to connect to an external power source, so that the sleeve body can be connected to the external power source through the conductive mechanism.

[0085] Compared with the existing graphite resin coating of the developing roller, the present embodiment makes the working surface 121, the non-working surface 122 and the sleeve body of the same material (all aluminum), so that the developing sleeve 12 has good wear resistance, and its concavo-convex structure will not be quickly worn out in the continuous friction with carbon powder and the scraper, so that the roughness of the working surface of the aluminum tube changes very little during the entire life cycle of the processing box, thereby allowing the initial roughness of the aluminum tube surface to be processed to a moderate value, reducing the overall powder consumption. Preferably, the concavo-convex structure on the working surface 121 is generated by the concavo-convex structure on the processing roller being transferred to the outer surface of the aluminum developing sleeve during the rolling process of the aluminum developing sleeve by the processing roller, and is integrated with the aluminum developing sleeve. The concavo-convex structure is stable and firm and will not separate from the developing sleeve.

[0086] Specifically, the coating of the developer roller carrying toner in the existing sandblasting or oil-spraying process is formed by attaching other materials to the surface of the aluminum tube. During use, the coating material wears due to friction, causing the surface roughness value to decrease rapidly. In order to avoid the rapid attenuation of the developer roller coating roughness affecting the printed image density, the initial surface roughness range of the developer roller coating prepared by the prior art usually exceeds the roughness value matching the toner particle size by a large amount, so as to ensure that the desired image can be output at the end of the life cycle of the processing box. At the same time, it also leads to excessive consumption of toner at the front end of the life cycle, resulting in 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, Japan, with an instrument accuracy of 0.001 μm; the instrument used to measure the diameter of the developing roller is Mitutoyo, 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 were distributed at both ends and the middle of the working surface of the developing roller. Three test points were selected for the developing roller. Figure 4 As shown (A1, B1, C1 points), the roughness Ra values ​​of the three points A1, B1, C1 on the same developing roller are tested and recorded by a roughness tester. The developing rollers with different experimental test data are used in the same image forming device for printing test. The test temperature is 20℃±3℃, the test humidity value is 40%RH~80%RH, and the number of printed pages is set in 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, printing blackness value and toner consumption of the working surface of the developing roller. By measuring the diameter of the developing roller working surface at the completion nodes of different printing stages and performing processing and calculation, the wear condition of the developing roller working surface can be obtained. The range of the developing roller surface roughness variation 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 the black value variation on the printed paper can be tested by a color density tester. The weight of toner consumed for printing a predetermined number of papers can be measured by an electronic scale. The data in the experimental test are recorded. The above data are shown in Table 1-11 below.

[0090] Table 1

[0091]

[0092] Table 2

[0093]

[0094] Table 3

[0095]

[0096] Table 4

[0097]

[0098] Table 5

[0099]

[0100] Table 6

[0101]

[0102] Table 7

[0103]

[0104] Table 8

[0105]

[0106] Table 9

[0107]

[0108] Table 10

[0109]

[0110] Table 11

[0111]

[0112] Among them, the above Tables 1 to 10 are data of an embodiment of a developing roller of the present invention, wherein 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 developing roller of oil spraying / sand blasting plus coating, wherein the roughness of the rough surface ranges from 1.3 μm to 1.9 μm.

[0113] The roughness range of the working surface of the developing roller in Table 1 and Table 2 is 0.9μm to 1.3μm, which is represented as developing roller No. 1. Taking developing roller No. 1-1 in Table 1 as an example, the test data is printed 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. From the first stage to the third stage, the blackness representing the printing quality varies from 1.16 to 1.21, the powder consumption varies from 3.2g to 3.7g, the thickness of the working surface wears from 0.001mm to 0.015mm, the range of the roughness difference in the first stage (same as the initial state) is 0μm to 0.25μm and the maximum roughness difference is 0.25μm, and when the third stage printing test is completed, the maximum roughness attenuation corresponding to each test point is 0.09μm.

[0114] The roughness range of the working surface of the developing roller in the above Tables 3-5 is 1.3μm~1.9μm, which is represented as 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 variation range that characterizes the printing quality is 1.44~1.48, the powder consumption variation range is 4.1g~4.9g, the wear range of the working surface thickness is 0.001mm~0.002mm, and the change of the roughness difference in the first stage (same as the initial state) is 0μm~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.

[0115] 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 as 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 variation range that characterizes the printing quality is 1.54 to 1.64, the powder consumption range is 5.0g to 5.6g, the wear range of the working surface thickness is 0.015mm to 0.002mm, and in the first stage (same as the initial state), the change of the roughness difference 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.

[0116] The roughness range of the working surface of the No. 4 developing roller in the prior art Table 11 is 1.3μm to 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 variation range that characterizes the printing quality is 1.19 to 1.4, the powder consumption variation range is 3.4g to 5.6g, the wear range of the working surface thickness is 0.003mm to 0.008mm, and the roughness difference of the test point in the first stage (same as the initial state) varies 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.

[0117] It should be noted that the wear of the working surface thickness is the average value of the absolute value 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 ​​of points A1, B1, and C1; the black value is a value that characterizes the printing quality. Generally speaking, a black 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.

[0118] In this embodiment, it can be seen from the maximum value of the roughness difference of the test point that the roughness difference of the No. 1, 2, and 3 developing rollers 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 the No. 3 developing roller exceeds 1.9μm, it can be clearly seen that the printing blackness value and the 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 the No. 2 developing roller. When the working surface roughness value is low, that is, when the surface roughness of the working surface of the No. 1 developing roller 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.

[0119] According to the commonly used toner of the image forming device, the roughness range of the developing roller is set to match the size of the toner to carry the toner, so that the printed product presents a better printing effect. The preferred roughness range of the working surface of the developing roller of the present application is 1.3-1.9 μm, which can match the requirements of the toner size to be carried, can effectively transport the toner and ensure excellent printing quality to achieve image printing.

[0120] Printing quality test and powder consumption test were conducted on the developer roller of the preferred working surface roughness range of 1.3μm to 1.9μm in the present application and the No. 4 developer roller of the prior art which also preferably matches the surface roughness of the carbon powder size coating of conventional printing. From the structural point of view, the obvious difference between the developer roller of the present application and the developer roller of the prior art is that the roughness difference of the test points selected by each developer roller in the embodiment of the present application is 0μm to 0.3μm, and the roughness difference of the two test points (B1, C1) with the largest difference in roughness value on the developer roller is within 0.1um to 0.3μm, and the largest value of the roughness difference of the two test points does not exceed 0.3μm, while the roughness difference of the two test points (A1, C1) of the No. 4 developer roller of the prior art has exceeded 0.3μm. It can be deduced that the maximum value of the roughness difference between any two points on the developer roller of the prior art 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 0.3μm. 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 0.3μm.

[0121] It should be noted that it has been explained in the previous article that controlling the maximum value of the roughness difference between any two points of the developing roller to within 0.1μm (taking the roughness value range of the developing roller working surface described in the previous article as 1.8μm~1.9μm as an example, the absolute maximum value of the roughness difference is 0.1μm) is lower than controlling the maximum value of the roughness difference to within 0.6μm (taking the roughness value range of the developing roller working surface as 1.6μm~2.1μm as an example, the absolute maximum value of the roughness difference is 0.6μm). The processing roller life is shorter and the processing cost is higher. Therefore, the preferred developing roller in the embodiment of the present application has the maximum absolute value of the roughness difference on the working surface controlled to above 0.1μm. 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, in the embodiment of the present application, when a metal rough surface consistent with the material of the developing roller is formed on the surface of the aluminum tube of the developing roller, 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 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 ranges from [0, 1μm, 0.6μm], and the absolute value range of the roughness difference between any two points is [0μm, 0.6μm]. It should be noted that, based on the preferred characteristics of the printing quality and toner consumption achieved by the developing roller, the following embodiments specifically describe the analysis and comparison of 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 embodiment of the present application has the maximum absolute value of the roughness difference on the working surface controlled below 0.3μm, that is, the preferred range of the maximum absolute value of the roughness difference on the working surface of the developing roller is [0.1μm, 0.3μm], and the preferred range of the roughness difference is [0, 0.3μm].

[0122] 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. In addition, the parameter variables of the sandblasting process are more, and the rough coating of the developing roller produced inevitably has a large roughness variation.

[0123] Further, according to the printing test effect data, the printing quality test and the powder consumption test are carried out. The No. 2 developing roller of the present application is compared with the No. 4 developing roller of the prior art for comparative analysis. The maximum absolute value of the roughness difference of the working surface of the No. 2 developing roller of the present application is controlled within 0.3μm, and the maximum value of the coating roughness difference of the No. 4 developing roller of the prior art has exceeded 0.3μm. Through the comparison of the printing quality, powder consumption and wear change value of the working rough surface, although they can all meet the roughness range of carrying carbon powder, the printing performance of the developing roller of the present application is better, and its blackness value is in the range of 1.44 to 1.48, the blackness change range is small, and it can meet the better printing blackness range of 1.4 to 1.5, which is the blackness value range recognized in the art that can 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 in the range of 4.2g to 4.5g. The blackness range of the prior art developing roller is 1.19-1.4, with a wide range of blackness changes, unstable printing quality, and when the printing blackness reaches 1.4, its powder consumption is 5.6g more than the powder consumption of the developing roller of the present application in the same state. This is calculated based on the powder consumption per 100 pages, that is, the same toner can complete more pages of printing with the developing roller of the present application, and if calculated based on the entire life of the developing roller, the printing volume of the developing roller of the present application will far exceed the number of pages of printing with the existing developing roller. Compared with the prior art, the developing roller of the present application completes printing with less powder consumption while ensuring better printing quality.

[0124] Furthermore, when the No. 2 developing roller of the present application and the No. 4 developing roller of the prior art have the same roughness range and are subjected to the same printing function test, when the same amount of paper is printed, for example, when printing 1000 sheets, the wear amount of the working surface thickness of the No. 2 developing roller of the present application compared with the initial state is 0.001mm, while the wear amount of the coating thickness of the No. 4 developing roller of the prior art compared with the initial state is 0.003mm; when printing 2000 sheets, the wear amount of the working surface of the No. 2 developing roller of the present application compared with the initial state is 0.002mm, and the wear amount of the coating of the No. 4 developing roller of the prior art compared with the initial state is 0.008mm. It can be clearly seen that the wear amount of the coating of the developing roller of the prior art is increasing with the increase of the number of printed pages. The wear amount of the first 1000 pages is 0.003mm, and the wear amount of the second 1000 pages compared with the previous 1000 pages is 0.005mm. In the service life of the developing roller of the prior art, the increase of the number of printed pages will cause the coating of the developing roller to wear faster. The wear amount of the working surface of the developing roller of the present application is in a very stable range. With the increase of the number of printed pages, the wear amount of the working surface does not change much when the same number of pages are printed, but maintains a consistent trend. The wear amount of the rough surface of the first 1000 pages is 0.001mm, and the wear amount of the second 1000 pages is still 0.001mm compared with the previous 100 pages. Even according to the developing rollers with roughness values ​​of the rough surface in other different ranges of the present application, the wear amount has always remained at about 0.001mm and will not exceed 0.003mm. The wear of the working surface of the developing roller of the present application will not accelerate with the increase of the number of printed pages at any time, and it is always maintained in an ideal state of less wear. The rough surface on the working surface of the developing roller of the present application is prepared 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 amount of the rough surface on the working surface of the developing roller of the present application is significantly less than the wear amount of the coating rough surface of the developing roller of the prior art, and has better wear resistance, can be used for a longer life cycle, and thus reduce costs.

[0125] In addition, after performing the same printing test, the maximum attenuation value of the roughness on the working surface of the No. 2-1 developing roller of the present application is 0.082μm, while the attenuation value of the No. 4 developing roller 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 practical applications, the rapid attenuation of the roughness will greatly affect the quality of printing. If the roughness of the working surface carrying the toner is unstable, it will gradually decay into a smooth outer surface and thus fail to adsorb and carry the toner normally. 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 and outstanding advantage of stable roughness, 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.

[0126] The present 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.).

[0127] 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 (the end point value is acceptable), and the optimal range is 0 to 0.3 μm (the end point value is acceptable); 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 (the end point value is acceptable), and the optimal range is 0.1 μm to 0.3 μm (the end point value is acceptable). Similarly, guided by the above experimental data, the change 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 (the end point value is acceptable), and the optimal range is 0.1μm~0.3μm (the 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 (the end point value is acceptable), and the optimal range is 0.1μm~0.3μm (the end point value is acceptable).

[0128] The present application prepares a developing roller by transfer processing, which mainly processes the rough structure on the transfer device first, and then transfers the rough structure to the developing roller through the transfer device to form a working surface with a predetermined range of surface roughness values, controls the rough structure of the transfer device, and uses consistent process parameters to batch process the developing roller, so that the finished product can achieve consistent quality. Compared with the existing oil spraying and sandblasting process for processing the developing roller, the processing technology of the present application is environmentally friendly and stable, low cost, and the quality of the finished developing roller obtained by processing is better. 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 working surface of the developing roller. For example, the higher the surface roughness value required for the working surface of the developing roller, the fewer the number of developing rollers processed by the transfer device with the same rough structure; the lower the surface roughness value required for the working surface of the developing roller, the more the number of developing rollers processed by the transfer device with the same rough structure. At the same time, when the surface roughness value of the processed working surface of the developing roller is lower, the surface roughness difference is also smaller. 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 the present application achieves the above purpose.

[0129] According to the imaging principle, the concavo-convex structure and roughness of the developing roller and developing sleeve surface affect the toner carrying capacity and charge, directly affecting the amount of toner adsorbed on the photosensitive drum for imaging, and further affecting the uniformity of image concentration. Compared with the developing roller formed by the traditional oil spraying process, the working surface of the developing roller of this embodiment for adsorbing toner has a concavo-convex structure, which is formed by using the aluminum base itself as the processing material to form a working surface with a predetermined roughness, rather than spraying other materials to form a coating with a roughness. The working surface of this embodiment has better wear resistance than the coating formed by graphite and resin. After long-term and multiple printing, the working surface will not have concavo-convex structure wear due to friction during the printing process, and will not affect the adsorption of toner. The uniform roughness also ensures the consistency of the toner charge in different areas.

[0130] This embodiment determines from different angles that the structure of the concave and convex areas of the developing roller that adsorb toner is uniform and the roughness is uniform, 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.

[0131] In addition to the wear resistance and roughness accuracy of the concave-convex structure of the developing roller sleeve surface that absorbs toner, the outer diameter runout amplitude generated when the developing roller rotates will also affect the transportation of toner. In order to form a high-precision image, the developing roller and the photosensitive drum need to maintain a fixed relative position relationship. The outer diameter runout value of the aluminum tube of the developing roller is 0 in the ideal state, but the tolerance of the aluminum tube of the developing roller in the manufacturing process causes the outer diameter runout to exist. In the process of coating the surface of the aluminum tube of the developing roller, the standard value of the outer diameter runout of the aluminum tube is generally 0.00-0.03mm. Due to the traditional oil spraying or sandblasting process, the pneumatic two-top method is generally used. In the process of continuous rotation and reciprocating processing, the aluminum tube runout value is prone to increase. If the outer diameter runout value increases, the spacing between the developing roller and the photosensitive drum will change as the developing roller rotates. Due to the fluctuation of the distance, the electric field force of the developing roller on the charged toner cannot stably transport the toner to the photosensitive drum, and the movement of the toner from the developing roller to the photosensitive drum is affected, which ultimately leads to uneven image density.

[0132] This embodiment not only forms a rough surface on the developing sleeve surface by transfer processing, but also can correct the original outer diameter runout value to improve the stability of the outer surface of the developing roller, enhance the stability of toner transport during the imaging process, and thus ensure the uniformity of image concentration.

[0133] The specific processing process of the working surface is to form a rough surface by rolling the outer surface of the sleeve body of the developing roller by the processing roller group, and the concave-convex structure on the rough surface is generated by the processing roller transfer. Specifically, the processing roller group includes a plurality of processing rollers, and the plurality of processing rollers are processed by sandblasting and hardening process to obtain a surface with high hardness and roughness. The processing rollers of the same group are processed by consistent sandblasting and hardening process parameters, so that a processing area with a first roughness is formed on the surface of each processing roller after processing, and the roughness of the first roughness is greater than or equal to the maximum value of the roughness of the working surface. The processing area of ​​the same group of processing rollers is brought into contact with the surface to be processed of the developing roller to be processed, and preferably, the processing rollers of the same group are evenly distributed on the outer periphery of the surface of the developing roller, and a predetermined pressure and rotational driving force are applied to one or more of the processing rollers to make the processing rollers rotate in the same direction and drive the developing roller to rotate. After rotating a predetermined number of times, the rough surface of the processing roller and the surface to be processed of the developing roller are rolled for multiple times, and a working surface with a preset roughness is formed on the surface of the aluminum tube of the developing roller. The pressure, rotational driving force and number of rotations applied to the processing roller can be changed according to the requirements of the surface roughness 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 pure physical process to obtain a developing roller that meets the preset conditions. No chemical reagents harmful to the environment are used or produced, and the processing method is green and environmentally friendly. On the other hand, it has a corrective effect on the incoming developing roller to be processed. After the incoming material enters the processing assembly for rolling processing, 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, and meeting the deviation accuracy requirements for the formation of high-precision images.

[0134] Reference Figure 3 As shown, 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. Exemplarily, the line connecting the axes of the three processing rollers 2 on the same cross section forms an equilateral triangle or an isosceles triangle.

[0135] In order to enable the carbon powder to be stably adsorbed on the working surface of the developing roller, i.e., the area with the concave-convex structure, it is necessary to accurately control the error range of its roughness. The developing roller to be processed is driven to rotate by the same group of processing rollers under a predetermined pressure. In this embodiment, the number of processing rollers in the same group is three, which are equidistant or non-equidistant in contact with the outer surface of the developing roller to be processed. The first pressure can be applied to any one or more processing rollers. In this application, the first pressure is applied to the processing roller at the vertex of the triangle. The rough area of ​​the processing roller contacts the surface of the developing roller to be processed. After sufficient contact and multiple rounds of rolling, a suitable roughness working area is formed on the contact surface of the developing roller. The rough pattern on the surface of the processing roller is evenly copied to the working area of ​​the developing roller to be processed to form a preset rough surface. A concave-convex structure is formed on the preset rough surface. The shape of the concave-convex structure on the rough surface can be regular or irregular. The arrangement of the concave-convex structure can be regular or irregular. The characteristics of the concave-convex structure are affected by the rough pattern on the surface of the processing roller and can be controlled according to the setting of the rough pattern on the surface of the processing roller. 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]. Taking any two points at the farthest edge of the working area or the center of the working area as an example, the roughness difference is controlled within the first threshold after measurement, which fully guarantees the uniformity and stability of the surface roughness of the working area, so that the amount of developer absorbed by the surface remains stable and uniform. The developing roller processed by rolling is subjected to uniform force, and its outer diameter runout value can be corrected. If it cannot be corrected or the surface of the developing sleeve tube of the developing roller to be processed itself has impurities or other defects, such as diameter not meeting the standard, etc., after rolling by the processing roller, if there are visible defects on the working area of ​​the surface of the developing roller, such as bright spots, the developing roller can be easily identified as a defective product, and direct removal can further improve the quality of the finished developing roller.

[0136] The rough surface is formed directly on the aluminum tube of the developer 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 developer 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.

[0137] Rolling the surface of the aluminum tube to form a rough working surface for carrying toner is a purely physical processing method. On the one hand, the ambient temperature during the processing is maintained within a stable range, and high temperature will not be generated to cause deformation of the developer roller components. For example, the transmission head assembled before surface processing will not be deformed by the subsequent rolling process and affect the quality of the developer 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 processing must be completed in the process steps of preparing the coating by spraying 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 harmful effects on the environment and human body.

[0138] In order to remove the 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 the present 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, it is not necessary to perform chamfering on the outer edge of the end of the developing roller. The end member can be directly embedded in the end of the developing roller for combination and fixation. Therefore, both ends of the developing sleeve body of this embodiment can be provided with no chamfers.

[0139] The traditional process of processing the rough surface of the developing roller by sandblasting and oil spraying is complicated. 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 wind pressure. The process requires chamfering, grinding 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 technical solution, the chamfering step can be omitted, which further saves the production cost and simplifies the processing flow, and the processing efficiency is high; the developing roller product produced has a simpler structure.

[0140] It should be noted that omitting the chamfer structure simplifies the processing technology and structure of the developing roller. However, 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.

[0141] Correspondingly, 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:

[0142] S11, controlling the processing roller to apply a predetermined pressure to the outer surface of the sleeve body of the developing roller.

[0143] S12, controlling the processing roller to rotate 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.

[0144] Specifically, a predetermined pressure is applied to the outer surface of the sleeve body of the developing roller by at least one processing roller group, and the sleeve body is driven to rotate a preset number of times by the rotation of at least one processing roller group, so that the concave-convex structure of at least one processing roller group 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 each 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. The roughness of the outer surface of the processing roller is greater than or equal to the preset roughness of the working surface of the developing roller sleeve to be processed.

[0145] The values ​​of the aforementioned predetermined pressure and preset number of turns can be determined according to the parameter requirements of the magnetic roller to be processed. The number of processing roller groups can be determined according to the actual processing needs. For example, one group of processing roller groups can be used to process the developing roller sleeve, or two, five or more groups of processing roller groups can be used to process multiple developing roller sleeves at the same time, thereby improving the 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. Among them, the connecting line of the axes of the three processing rollers on the same cross section is an equilateral triangle or an isosceles triangle.

[0146] 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.

[0147] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A developing roller, characterized in that: include: Magnetic core; A developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and the developing sleeve comprises a sleeve body and a working surface, 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; Wherein, the working surface is set as a rough surface with a concave-convex structure and is used to carry carbon powder; the concave-convex structure of the rough surface is arranged irregularly; The absolute value of the difference between the roughness values ​​Ra of any two points on the working surface is ΔR1, and 0≤ΔR1≤0.6μm; The maximum absolute value of the difference between the roughness values ​​Ra of any two points on the working surface is ΔR max , and 0.1μm≤ΔR max ≤0.6μm.

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

3. The developing roller according to claim 1, characterized in that The ΔR max Satisfy: 0.1μm≤ΔR max ≤0.3μm.

4. The developing roller according to claim 1, characterized in that include: Magnetic core; A developing sleeve, wherein the developing sleeve is made of metal, the developing sleeve is sleeved on the magnetic core, and the developing sleeve comprises a sleeve body and a working surface, 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; Wherein, the working surface is set as a rough surface with a concave-convex structure and is used to carry carbon powder; the concave-convex structure of the rough surface is arranged irregularly; The absolute value of the difference between the roughness values ​​Ra of any two points on the working surface located in the axial direction of the developing sleeve is ΔR2, the absolute value of the difference between the roughness values ​​Ra of 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.

5. The developing roller according to claim 4, characterized in that The absolute value ΔR2 of the difference between the roughness values ​​Ra of any two points on the working surface located in the axial direction of the developing sleeve satisfies: 0≤ΔR2≤0.3 μm; and / or An absolute value ΔR3 of a difference in roughness values ​​Ra between any two points on the working surface in the circumferential direction of the developing sleeve satisfies: 0≤ΔR3≤0.3 μm.

6. The developing roller according to claim 1 or 4, characterized in that: The roughness value of the working surface is Ra, and 0.9 μm≤Ra≤3.0 μm.

7. The developing roller according to claim 6, characterized in that The roughness value Ra of the working surface satisfies: 1.3 μm≤Ra≤1.9 μm.

8. The developing roller according to claim 1 or 4, characterized in that: Both ends of the sleeve body are not provided with chamfers.

9. The developing roller according to claim 1 or 4, characterized in that: At least one end of the sleeve body is provided with a chamfer.

10. The developing roller according to claim 1 or 4, characterized in that: The developing roller also includes a transmission head and a conductive mechanism respectively arranged at two ends of the sleeve body, the transmission head is used to receive an external driving force, and the conductive mechanism is used to connect the sleeve body to an external power source.

11. The developing roller according to claim 10, characterized in that The conductive mechanism includes a mounting bracket and a wire; the mounting bracket is mounted on 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 to connect to the external power supply.

12. The developing roller according to claim 1 or 4, characterized in that: The sleeve body and the working surface are both made of aluminum.

13. The developing roller according to claim 1 or 4, characterized in that: The concavo-convex structure of the rough surface has a regular shape or an irregular shape.

14. The developing roller according to claim 1 or 4, characterized in that: The rough surface is formed by rolling the outer surface of the sleeve body with a processing roller, and the concave-convex structure on the rough surface is generated by transfer printing of the processing roller.

15. The developing roller according to claim 14, characterized in that 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.

16. The developing roller according to claim 14, characterized in that The rough surface is formed by rolling the outer surface of the sleeve body together with a processing roller set, wherein the processing roller set 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.

17. The developing roller according to claim 16, characterized in that The processing roller set comprises three processing rollers, which are spaced apart in the circumferential direction and enclose a processing area for accommodating the sleeve body.

18. The developing roller according to claim 17, characterized in that The connecting line of the axes of the three processing rollers on the same cross section forms an equilateral triangle or an isosceles triangle.

19. The developing roller according to claim 14, 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.

20. A process cartridge, characterized in that: It comprises a photosensitive drum, a powder bin, a waste powder bin and a developing roller according to any one of claims 1 to 19, wherein the photosensitive drum is mounted on the waste powder bin, and the developing roller is mounted on the powder bin.

21. A method for processing a developing roller, characterized in that: include: Controlling the processing roller to apply a predetermined pressure to the outer surface of the sleeve body of the developing roller; Controlling the processing roller to rotate 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 and irregularly arranged concave-convex structure; Among them, the absolute value of the difference between the roughness values ​​Ra of any two points on the working surface is ΔR1, and 0≤ΔR1≤0.6μm; The absolute value of the difference between the roughness values ​​Ra of 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 between the roughness values ​​Ra of 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; The maximum absolute value of the difference between the roughness values ​​Ra of any two points on the working surface is ΔR max , and 0.1μm≤ΔR max ≤0.6μm.

22. The processing method according to claim 21, characterized in that: 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 sleeve body is driven to rotate a preset number of times by controlling the rotation of at least one group of processing roller groups, so that the concave-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.

23. The processing method according to claim 22, characterized in that: The processing roller set comprises 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.

24. The processing method according to claim 21, 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.

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