A new type of charging roller
Patent Information
- Application Number
- CN202521457595.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-12
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-07-12
AI Technical Summary
[0003]目前主流的充电辊金属芯轴主要分为实心金属管和空心金属管，实心金属管凭借致密的金属结构，具备较高的刚性和抗变形能力，但实心结构的热传导路径单一，工作时因高压电流产生的热量难以快速散发，长期高温会加速外层导电橡胶的老化；空心金属管通过中空结构形成自然的空气对流通道，散热效率显著优于实心结构，能有效延缓外层材料的热老化，但中空设计牺牲了部分结构强度，在长期使用或打印机振动环境下，芯轴易出现轻微弯曲或形变，因此，现在对一种新型充电辊做出改进
本申请中，通过在导电轴内壁开设安装槽与定位条形成滑动配合，通过导电套管将定位条限位固定在导电轴内部，若干个均匀分布的支撑环固定在定位条内侧，形成“间隔式支撑骨架”，支撑环与导电轴内壁紧密配合，可抵消径向压力或弯曲力，用来增强导电轴的整体强度，且支撑环内部的蜂窝形散热孔用来维持空气对流通道，使热量能更均匀地通过空气流动带走，避免局部积热，导电弹性层包裹在导电轴外层，是充电辊与感光鼓接触的关键缓冲结构，表面涂层防止墨粉、纸屑或油污附着在导电弹性层外表面上，维持充电稳定性。
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Figure CN224773330U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of printer technology, and more particularly to a novel charging roller. Background Technology
[0002] The printer charging roller is a critical consumable component in laser printers. Its main function is to uniformly charge the surface of the photosensitive drum (OPC drum), giving it a static charge of a specific polarity, laying the foundation for subsequent image formation (exposure, development, etc.). As a consumable component of the printer, the structural design of the charging roller must simultaneously meet three core requirements: conductivity, structural strength, and heat dissipation.
[0003] Currently, the mainstream charging roller metal cores are mainly divided into solid metal tubes and hollow metal tubes. Solid metal tubes, with their dense metal structure, have high rigidity and resistance to deformation. However, the heat conduction path of the solid structure is single, and the heat generated by the high voltage current during operation is difficult to dissipate quickly. Long-term high temperature will accelerate the aging of the outer conductive rubber. Hollow metal tubes form a natural air convection channel through their hollow structure, and their heat dissipation efficiency is significantly better than that of solid structures. This can effectively delay the thermal aging of the outer material. However, the hollow design sacrifices some structural strength. Under long-term use or printer vibration environment, the core is prone to slight bending or deformation. Therefore, an improvement has been made to a new type of charging roller. Utility Model Content
[0004] In view of the shortcomings of the prior art, this application provides a novel charging roller that overcomes the deficiencies of the prior art and aims to solve the problems in the prior art.
[0005] To achieve the above objectives, this application provides the following technical solution: a novel charging roller, comprising a conductive shaft, wherein the conductive shaft is a hollow tube with an installation groove on its inner wall, a positioning strip is slidably inserted into the installation groove, and a plurality of support rings evenly distributed along its length are fixedly connected to the inner side of the positioning strip, the support rings having honeycomb-shaped heat dissipation holes inside, a conductive elastic layer is sleeved on the outer wall of the conductive shaft, a surface coating is sprayed on the outer wall of the conductive elastic layer, connecting threads are provided on both sides of the outer wall of the conductive shaft located on the conductive elastic layer, and a conductive sleeve is threadedly sleeved on the conductive shaft through the connecting threads.
[0006] By adopting the above technical solution, a mounting groove is opened on the inner wall of the conductive shaft to form a sliding fit with the positioning strip. The positioning strip is limited and fixed inside the conductive shaft by a conductive sleeve. Several evenly distributed support rings are fixed inside the positioning strip to form an "interval support skeleton". The support rings fit tightly with the inner wall of the conductive shaft to offset radial pressure or bending force, thereby enhancing the overall strength of the conductive shaft. The honeycomb heat dissipation holes inside the support rings are used to maintain air convection channels, so that heat can be carried away more evenly by air flow, avoiding local heat accumulation. The conductive elastic layer is wrapped around the outer layer of the conductive shaft and is a key buffer structure for the contact between the charging roller and the photosensitive drum. The surface coating prevents toner, paper scraps or oil stains from adhering to the outer surface of the conductive elastic layer, maintaining charging stability.
[0007] As a preferred embodiment of this application, both the conductive shaft and the support ring are conductive metal components, and the outer wall of the support ring is in contact with the inner wall of the conductive shaft.
[0008] By adopting the above technical solution, the conductive shaft, as the core conductive component of the charging roller, needs to stably conduct high voltage current to the outer conductive elastic layer and surface coating to ultimately achieve uniform charging of the printing medium. The support ring is made of conductive metal, making it not only a structural support but also an auxiliary conductor. While conducting current, the support ring can conduct the heat generated by the current on the conductive shaft to the honeycomb heat dissipation holes more quickly, accelerating heat exchange with the air and avoiding overheating caused by local current concentration.
[0009] As a preferred technical solution of this application, the number of positioning strips and mounting slots is the same, with three in each case, and the three mounting slots are evenly distributed in a circular array on the inner wall of the conductive shaft.
[0010] By adopting the above technical solution, after the three positioning strips are embedded into the corresponding mounting slots, the support ring can be tightly attached to the inner wall of the conductive shaft through uniform radial tension, ensuring that the contact pressure between each support ring and the inner wall of the shaft is consistent, and avoiding support failure or vibration noise caused by local gaps.
[0011] As a preferred embodiment of this application, the length of the positioning strip is the same as the length of the conductive shaft, and both ends of the positioning strip are respectively attached to the inner walls of the two conductive sleeves, and the end of the conductive sleeve near the conductive elastic layer is attached to the outer wall of the conductive elastic layer.
[0012] By adopting the above technical solution, the positioning strip's length is consistent with the conductive shaft, meaning it can form a "through-type auxiliary skeleton" along the entire axial direction of the conductive shaft. Combined with evenly distributed support rings, the supporting force can be extended from a localized area to the entire length. The positioning strip is fixed inside the conductive shaft by a conductive sleeve, which fits against the outer wall of the conductive elastic layer, effectively forming flanges at both ends of the conductive elastic layer. This limits the axial displacement of the conductive elastic layer caused by long-term use or temperature changes. As a preferred technical solution of this application, the conductive elastic layer is made of EPDM rubber, and the interior of the conductive elastic layer is filled with conductive particles such as carbon black, and the surface coating is a polyurethane nano-coating.
[0013] By adopting the above technical solution, EPDM rubber is an elastic material that is resistant to aging and high and low temperatures. The conductive elastic layer made from it is not easy to harden or crack due to long-term high temperature or changes in environmental humidity, and can maintain good elasticity for a long time. By filling the interior of the conductive elastic layer with conductive particles such as carbon black to improve conductivity, the surface coating can reduce the frictional resistance between the conductive elastic layer and the photosensitive drum and reduce the noise of printer operation.
[0014] As a preferred embodiment of this application, the conductive elastic layer is provided with reinforcing ribs, which are made of nitrile rubber.
[0015] By adopting the above technical solution, the reinforcing ribs made of nitrile rubber have excellent tensile strength, tear strength and wear resistance, which can be used to improve the overall strength of the conductive elastic layer and prevent the conductive elastic layer from deforming.
[0016] In summary, the beneficial effects of this application are as follows: In this application, a mounting groove is opened on the inner wall of the conductive shaft to form a sliding fit with the positioning strip. The positioning strip is limited and fixed inside the conductive shaft by a conductive sleeve. Several evenly distributed support rings are fixed inside the positioning strip to form an "interval support skeleton". The support rings fit tightly with the inner wall of the conductive shaft to offset radial pressure or bending force, thereby enhancing the overall strength of the conductive shaft. The honeycomb heat dissipation holes inside the support rings are used to maintain air convection channels, so that heat can be carried away more evenly by air flow, avoiding local heat accumulation. The conductive elastic layer is wrapped around the outer layer of the conductive shaft and is a key buffer structure for the contact between the charging roller and the photosensitive drum. The surface coating prevents toner, paper scraps or oil stains from adhering to the outer surface of the conductive elastic layer, maintaining charging stability. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the installation of the conductive sleeve of this application; Figure 3This is a partial structural breakdown diagram of this application; Figure 4 This application is Figure 2 An enlarged schematic diagram of the structure at point A.
[0018] Explanation of reference numerals in the attached figures: 1. Conductive shaft; 2. Mounting groove; 3. Positioning strip; 4. Support ring; 5. Honeycomb heat dissipation holes; 6. Connecting thread; 7. Conductive sleeve; 8. Conductive elastic layer; 9. Reinforcing rib; 10. Surface coating. Detailed Implementation
[0019] To make the technical means, creative features, objectives and effects of this application easy to understand, the following describes this application in conjunction with specific implementation methods.
[0020] like Figure 1 - Figure 4 As shown, this embodiment provides a novel charging roller, including a conductive shaft 1. The conductive shaft 1 is a hollow tube design with an installation groove 2 on its inner wall. A positioning strip 3 is slidably inserted into the installation groove 2. Several support rings 4 are fixedly connected to the inner side of the positioning strip 3, evenly distributed along its length. The support rings 4 have honeycomb-shaped heat dissipation holes 5 inside. A conductive elastic layer 8 is sleeved on the outer wall of the conductive shaft 1. A surface coating 10 is sprayed on the outer wall of the conductive elastic layer 8. Connecting threads 6 are provided on both sides of the outer wall of the conductive shaft 1 at the conductive elastic layer 8. A conductive sleeve 7 is threaded onto the conductive shaft 1 through the connecting threads 6. In use, the installation groove 2 and the positioning strip 3 are opened on the inner wall of the conductive shaft 1. A sliding fit is formed, and the positioning strip 3 is limited and fixed inside the conductive shaft 1 by the conductive sleeve 7. Several evenly distributed support rings 4 are fixed inside the positioning strip 3 to form an "interval support skeleton". The support rings 4 are tightly fitted with the inner wall of the conductive shaft 1 to offset radial pressure or bending force and enhance the overall strength of the conductive shaft 1. The honeycomb heat dissipation holes 5 inside the support rings 4 are used to maintain the air convection channel so that heat can be carried away more evenly by air flow and avoid local heat accumulation. The conductive elastic layer 8 is wrapped around the outer layer of the conductive shaft 1 and is a key buffer structure for the contact between the charging roller and the photosensitive drum. The surface coating 10 prevents toner, paper scraps or oil stains from adhering to the outer surface of the conductive elastic layer 8 and maintains charging stability.
[0021] In this embodiment, as Figure 2 and 3As shown, both the conductive shaft 1 and the support ring 4 are conductive metal components, and the outer wall of the support ring 4 is in contact with the inner wall of the conductive shaft 1. During use, the conductive shaft 1, as the core conductive component of the charging roller, needs to stably conduct the high voltage current to the outer conductive elastic layer 8 and the surface coating 10, so as to achieve uniform charging of the printing medium. The support ring 4 is made of conductive metal, so that it is not only a structural support component, but also an auxiliary conductor. While conducting current, the support ring 4 can conduct the heat generated by the current on the conductive shaft 1 to the honeycomb heat dissipation holes 5 more quickly, accelerate the heat exchange with the air, and avoid overheating caused by local current concentration.
[0022] In this embodiment, as Figure 3 As shown, the number of positioning strips 3 and mounting slots 2 is the same, with three in each case. The three mounting slots 2 are evenly distributed in a circumferential array on the inner wall of the conductive shaft 1. In use, after the three positioning strips 3 are embedded into the corresponding mounting slots 2, the support rings 4 can be tightly attached to the inner wall of the conductive shaft 1 through uniform radial tension, ensuring that the contact pressure between each support ring 4 and the inner wall of the shaft is consistent, and avoiding support failure or vibration noise caused by local gaps.
[0023] In this embodiment, as Figure 1 and 3 As shown, the length of the positioning strip 3 is the same as the length of the conductive shaft 1, and both ends of the positioning strip 3 are respectively attached to the inner walls of the two conductive sleeves 7. The end of the conductive sleeve 7 near the conductive elastic layer 8 is attached to the outer wall of the conductive elastic layer 8. In use, the length of the positioning strip 3 is consistent with that of the conductive shaft 1, which means that it can form a "through-type auxiliary skeleton" along the entire axial direction of the conductive shaft 1. With the evenly distributed support rings 4, the support force can be extended from a local area to the entire length. The positioning strip 3 is limited and fixed inside the conductive shaft 1 by the conductive sleeves 7. The conductive sleeves 7 are attached to the outer wall of the conductive elastic layer 8, which is equivalent to forming a retaining edge at both ends of the conductive elastic layer 8, which can limit the axial displacement of the conductive elastic layer 8 caused by long-term use or temperature changes. In this embodiment, as Figure 4 As shown, the conductive elastic layer 8 is made of EPDM rubber, and the interior of the conductive elastic layer 8 is filled with conductive particles such as carbon black. The surface coating 10 is a polyurethane nano-coating. In use, EPDM rubber is an elastic material that is resistant to aging and high and low temperatures. The conductive elastic layer 8 made of it is not easy to harden or crack due to long-term high temperature or changes in environmental humidity, and can maintain good elasticity for a long time. The conductivity is improved by filling the interior of the conductive elastic layer 8 with conductive particles such as carbon black. The surface coating 10 can reduce the frictional resistance between the conductive elastic layer 8 and the photosensitive drum and reduce the printer operating noise.
[0024] In this embodiment, as Figure 4As shown, the conductive elastic layer 8 has a reinforcing rib 9 inside. The reinforcing rib 9 is made of nitrile rubber. When in use, the reinforcing rib 9 made of nitrile rubber has excellent tensile strength, tear strength and wear resistance, which is used to improve the overall strength of the conductive elastic layer 8 and prevent the conductive elastic layer 8 from deforming.
[0025] The working principle of this application is as follows: When using the novel charging roller of this application, the positioning strip 3 is inserted into the inside of the conductive shaft 1 along the mounting groove 2. The positioning strip 3 is fixed inside the conductive shaft 1 by tightening the conductive sleeve 7. The three mounting grooves 2 on the inner wall of the conductive shaft 1 and the positioning strip 3 on the outer wall of the support ring 4 are matched by a circumferential array to achieve circumferential fixation between the support ring 4 and the conductive shaft 1, avoiding relative rotation. The support ring 4 and the inner wall of the conductive shaft 1 are tightly fitted to offset radial pressure or bending force, thereby enhancing the overall strength of the conductive shaft 1. The honeycomb heat dissipation holes 5 inside the support ring 4 are used to maintain the air convection channel, so that heat can be carried away more evenly through air flow, avoiding local heat accumulation. The conductive elastic layer 8 is wrapped around the outer layer of the conductive shaft 1 and is a key buffer structure for the contact between the charging roller and the photosensitive drum. The surface coating 10 prevents toner, paper scraps or oil stains from adhering to the outer surface of the conductive elastic layer 8, maintaining charging stability.
[0026] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0028] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.
Claims
1. A novel charging roller, comprising a conductive shaft (1), characterized in that, The conductive shaft (1) is a hollow tube design and has an installation groove (2) on its inner wall. A positioning strip (3) is slidably inserted into the installation groove (2). Several support rings (4) are fixedly connected to the inner side of the positioning strip (3) and are evenly distributed along its length. The support rings (4) have honeycomb-shaped heat dissipation holes (5) inside. A conductive elastic layer (8) is sleeved on the outer wall of the conductive shaft (1). A surface coating (10) is sprayed on the outer wall of the conductive elastic layer (8). Connecting threads (6) are provided on both sides of the outer wall of the conductive shaft (1) on the conductive elastic layer (8). A conductive sleeve (7) is threaded onto the conductive shaft (1) through the connecting threads (6).
2. A novel charging roller as claimed in claim 1, wherein, Both the conductive shaft (1) and the support ring (4) are conductive metal components, and the outer wall of the support ring (4) is in contact with the inner wall of the conductive shaft (1).
3. A novel charging roller as claimed in claim 1, wherein, The number of positioning strips (3) and mounting grooves (2) is the same, with three in each case, and the three mounting grooves (2) are evenly distributed in a circular array on the inner wall of the conductive shaft (1).
4. A novel charging roller as claimed in claim 1, wherein, The length of the positioning strip (3) is the same as the length of the conductive shaft (1), and the two ends of the positioning strip (3) are respectively attached to the inner walls of the two conductive sleeves (7), and the end of the conductive sleeve (7) near the conductive elastic layer (8) is attached to the outer wall of the conductive elastic layer (8).
5. A novel charging roller as claimed in claim 1, wherein, The conductive elastic layer (8) is made of EPDM rubber, and the interior of the conductive elastic layer (8) is filled with carbon black conductive particles. The surface coating (10) is a polyurethane nano-coating.
6. A novel charging roller as claimed in claim 1, wherein, The conductive elastic layer (8) is provided with reinforcing ribs (9) inside, and the reinforcing ribs (9) are made of nitrile rubber.