A multi-layered composite layer charging roll

Abstract

The utility model relates to charging roller technical field especially relates to a kind of charging roller of multilayer composite layer. Including selenium drum frame, adjusting device, the inner wall of selenium drum frame is provided with photosensitive drum, the both sides surface of selenium drum frame is provided with installation side plate, installation side plate is equipped with charging roller body by adjusting device, charging roller body includes outer sleeve and conductive aluminium core, outer sleeve is set on the surface of conductive aluminium core, charging roller body is located the inner wall surface of selenium drum frame, and the position of charging roller body corresponds with the position of photosensitive drum, adjusting device includes positioning frame, the surface of one side of positioning frame is fixedly connected with installation side plate, the inner wall of positioning frame is rotatably connected with the arc surface of one end of conductive aluminium core, the lower surface of positioning frame is equipped with sliding slot, the inner wall of sliding slot is slidably connected with sliding block, and one end of sliding block is fixedly connected with connecting rod. The utility model provides a kind of charging roller of multilayer composite layer has the advantage that it is convenient to limit protection for charging roller.

Description

Technical Field

[0001] This utility model relates to the field of charging roller technology, and in particular to a multi-layer composite charging roller. Background Technology

[0002] In the field of electronic imaging, such as laser printers and copiers, the charging roller is a crucial core component. Its main function is to provide a uniform, stable, and specific polarity of charge to the surface of the photosensitive drum in the initial stage of the imaging process, enabling the photosensitive drum to form an electrostatic latent image through exposure, and then complete the subsequent development and transfer processes.

[0003] Existing technologies, such as the utility model with publication number CN223377602U, disclose a charging roller. This patent includes a roller assembly, which comprises a first roller and a second roller. A connecting shaft is fixedly connected to one end of the first roller, and two limiting pieces are fixedly connected to the side surface of the connecting shaft. A connecting hole is opened at one end of the second roller, and limiting grooves are opened on both sides of the inner wall of the connecting hole. The connecting shaft and the two limiting pieces pass through the connecting hole and the limiting groove and are engaged inside the positioning groove. A positioning groove is opened inside the second roller, and the positioning groove communicates with the connecting hole. Rotating shafts are fixedly connected to the opposite sides of the first and second rollers. This utility model, through the roller assembly, facilitates the disassembly of the entire charging roller structure, thereby enabling partial replacement of various components of the charging roller and reducing the cost of the charging roller.

[0004] During prolonged use of toner cartridge equipment, the old charging roller will need to be replaced. In traditional structures without dedicated replacement tools, the installation process relies on experience and feel, the gap between the charging roller and the photosensitive drum cannot be accurately measured and controlled, and the fixing method is inconsistent and lacks an effective benchmark. As a result, the replaced charging roller cannot maintain precise parallelism and optimal gap with the photosensitive drum, ultimately causing quality defects such as background graying, streaks, and uneven images in the printed products. In some cases, improper contact pressure can even accelerate the wear and tear of the photosensitive drum and charging roller themselves. Summary of the Invention

[0005] The purpose of this invention is to solve the problem in the prior art that the replacement charging roller cannot maintain precise parallelism and optimal gap with the photosensitive drum, which ultimately leads to quality defects such as background gray, streaks, and uneven images in the printed products, and even accelerates the wear of the photosensitive drum and charging roller due to improper contact pressure.

[0006] To solve the above technical problems, this utility model provides a multi-layer composite charging roller, including: a drum frame and an adjustment device. A photosensitive drum is disposed on the inner wall of the drum frame. Mounting side plates are disposed on both sides of the drum frame. A charging roller body is mounted on the mounting side plates via the adjustment device. The charging roller body includes an outer sleeve and a conductive aluminum core. The outer sleeve is fitted over the surface of the conductive aluminum core. The charging roller body is located on the inner wall surface of the drum frame, and its position corresponds to the position of the photosensitive drum. The adjustment device includes a positioning frame, and one side of the positioning frame... The positioning frame is fixedly connected to the surface of the mounting side plate. The inner wall of the positioning frame is rotatably connected to the arc surface of one end of the conductive aluminum core. A sliding groove is provided on the lower surface of the positioning frame. A slider is slidably connected to the inner wall of the sliding groove. A connecting rod is fixedly connected to one end of the slider. A limit frame is fixedly connected to the surface of the connecting rod. A rotating shaft is threaded through the upper surface of the limit frame. A fixing ring is rotatably connected to the bottom end of the rotating shaft. The cross-section of the fixing ring is "C". The inner wall of the fixing ring abuts against the arc surface of the conductive aluminum core. Both ends of the fixing ring abut against the surface of the positioning frame.

[0007] The aforementioned components achieve the following effects: the adjustment device, through the coordinated action of the positioning frame, slide rail, slider, connecting rod, limit frame, rotating shaft, and fixing ring, enables rapid installation and precise adjustment of the charging roller body. The positioning frame is fixedly connected to the mounting side plate, providing a stable support base; the slide rail and slider allow for fine-tuning of the charging roller body during installation, ensuring its accurate alignment with the photosensitive drum; the rotating shaft drives the fixing ring up and down via a threaded structure, causing the fixing ring to press tightly against the conductive aluminum core, thereby firmly securing the charging roller body and preventing loosening during operation. This design improves the installation efficiency and stability of the charging roller, ensuring consistent print quality.

[0008] Preferably, the outer sleeve comprises, from the outside to the inside, a treatment layer, a protective layer, an insulating layer, and a conductive layer, wherein the treatment layer is a chromium-plated coating, the protective layer is a polyurethane coating, the insulating layer is a polyvinyl chloride coating, and the conductive layer is a conductive carbon black layer.

[0009] The aforementioned components achieve the following effects: the multi-layered composite structure of the outer tube provides comprehensive functional protection. The chrome plating enhances the surface hardness and abrasion resistance of the outer tube, extending its service life; the polyurethane coating offers excellent elasticity and corrosion resistance, cushioning external impacts; the PVC coating effectively prevents current leakage, ensuring safety; and the conductive carbon black layer guarantees uniform charge distribution, improving charging efficiency. This layered design optimizes the electrical performance and mechanical durability of the charging roller, making it suitable for high-speed printing environments.

[0010] Preferably, baffles are fixedly connected to both sides of the slide groove on the surface of the positioning frame, and the cross-sectional dimensions of the baffles are adapted to the cross-sectional dimensions of the slide groove.

[0011] The aforementioned components achieve the following effects: the baffles, positioned on both sides of the slide groove, serve as guides and limiters, preventing the slider from detaching from the slide groove during sliding, thus enhancing the stability and reliability of the adjustment device. The dimensional fit between the baffles and the slide groove ensures smooth slider movement, avoiding jamming or offset, and making the position adjustment of the charging roller body more precise and smooth.

[0012] Preferably, a guide rod slides through the upper surface of the limiting frame, and the bottom end of the guide rod is fixedly connected to the upper surface of the fixing ring.

[0013] The aforementioned components achieve the following effects: the guide rod passes through the limiting frame and is fixedly connected to the fixing ring. When the rotating shaft drives the fixing ring to move, the guide rod plays a guiding and stabilizing role, preventing the fixing ring from rotating or tilting, and ensuring that the fixing ring always moves vertically up and down. This improves the uniformity of contact between the fixing ring and the conductive aluminum core, enhances the fixing effect, and reduces wear and the risk of failure.

[0014] Preferably, the upper arc surface of the rotating shaft is provided with a plurality of auxiliary grooves, and the plurality of auxiliary grooves are evenly distributed on the surface of the rotating shaft.

[0015] The effects achieved by the above components are as follows: the auxiliary grooves increase the coefficient of friction on the surface of the rotating shaft, making it easier for the operator to grip and apply force when rotating manually, thus improving the convenience of adjustment. The evenly distributed auxiliary grooves ensure uniform distribution of rotational force, preventing slippage and making the rotating shaft rotate more smoothly, thereby precisely controlling the clamping force of the retaining ring.

[0016] Preferably, a bearing ring is fixedly connected to the inner wall surface of the mounting side plate at the position corresponding to the conductive aluminum core. The bearing ring is a stainless steel ring with a "U" shaped cross section, and the inner wall of the bearing ring abuts against the arc surface of the conductive aluminum core.

[0017] The aforementioned components achieve the following effects: the bearing ring, made of stainless steel, possesses high strength and corrosion resistance. Serving as an additional support point for the conductive aluminum core, it distributes the load across the charging roller body, reducing deformation and wear over long-term use. The U-shaped cross-section abuts against the arc surface of the conductive aluminum core, providing a stable bearing surface and ensuring the charging roller body maintains the correct position during operation, thus improving the overall durability and reliability of the structure.

[0018] Preferably, the positioning frame is a rigid plastic frame, and the inner wall dimensions of the positioning frame are adapted to the cross-sectional dimensions of the conductive aluminum core.

[0019] The aforementioned components achieve the following effects: the rigid plastic positioning frame is both lightweight and robust, possessing excellent mechanical strength and insulation, thus reducing overall weight and cost. The inner wall dimensions are matched to the cross-sectional dimensions of the conductive aluminum core, ensuring precise alignment during charging roller installation, reducing gaps and wobble, and improving installation stability and accuracy, thereby guaranteeing uniform contact between the charging roller and the photosensitive drum.

[0020] Compared with related technologies, the multi-layer composite charging roller provided by this utility model has the following beneficial effects: This invention provides a multi-layered composite charging roller. Through the operation of the adjustment device, the charging roller body can be quickly and accurately installed and adjusted, achieving a stable and reliable fixation. The structure of driving the fixed ring to rise and fall via a rotating shaft allows for easy tightening or loosening of the conductive aluminum core, simplifying the installation and disassembly process. The matching design of the groove and slider allows for fine-tuning of the charging roller body during installation, ensuring that it maintains the optimal relative position with the photosensitive drum, thereby guaranteeing charging uniformity and printing quality. The multi-layered composite outer sleeve design of the charging roller body, consisting of a chrome-plated treatment layer, a polyurethane protective layer, a polyvinyl chloride insulating layer, and a conductive carbon black layer, combines wear resistance, corrosion resistance, insulation, and conductivity, significantly improving the overall durability of the charging roller. Simultaneously, the application of components such as the stainless steel bearing ring enhances the mechanical strength of key parts. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a multi-layer composite charging roller provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the charging roller. Figure 3 for Figure 2 The enlarged structural diagram at point A is shown below; Figure 4 for Figure 1 The diagram shows the structure of the regulating device. Figure 5 for Figure 4 A partial structural schematic diagram of the adjustment device is shown.

[0022] The following are the labeling elements in the diagram: 1. Toner cartridge frame; 2. Photosensitive drum; 3. Charging roller body; 31. Outer sleeve; 311. Processing layer; 312. Protective layer; 313. Insulating layer; 314. Conductive layer; 32. Conductive aluminum core; 4. Adjustment device; 401. Bearing ring; 402. Positioning frame; 403. Limiting frame; 404. Rotating shaft; 405. Fixing ring; 406. Guide rod; 407. Slide groove; 408. Slider; 409. Connecting rod; 410. Baffle; 411. Auxiliary groove; 5. Mounting side plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0025] Please see Figures 1 to 5 This utility model provides a multi-layer composite charging roller, including: a drum frame 1 and an adjustment device 4. The inner wall of the drum frame 1 is provided with a photosensitive drum 2. Both sides of the drum frame 1 are provided with mounting side plates 5. The mounting side plates 5 are mounted with the charging roller body 3 by means of the adjustment device 4. The charging roller body 3 includes an outer sleeve 31 and a conductive aluminum core 32. The outer sleeve 31 is sleeved on the surface of the conductive aluminum core 32. The charging roller body 3 is located on the inner wall surface of the drum frame 1, and the position of the charging roller body 3 corresponds to the position of the photosensitive drum 2.

[0026] In the embodiments of this utility model, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5The adjusting device 4 includes a positioning frame 402. One side of the positioning frame 402 is fixedly connected to the surface of the mounting side plate 5. The inner wall of the positioning frame 402 is rotatably connected to the arc surface of one end of the conductive aluminum core 32. A groove 407 is provided on the lower surface of the positioning frame 402. A slider 408 is slidably connected to the inner wall of the groove 407. A connecting rod 409 is fixedly connected to one end of the slider 408. A limit frame 403 is fixedly connected to the surface of the connecting rod 409. The upper end of the limit frame 403 is... A rotating shaft 404 is threaded through the surface, and a retaining ring 405 is rotatably connected to the bottom end of the rotating shaft 404. The retaining ring 405 has a "C" shaped cross-section, and its inner wall abuts against the arc surface of the conductive aluminum core 32. Both ends of the retaining ring 405 abut against the surface of the positioning frame 402. The outer sleeve 31 includes, from the outside to the inside, a treatment layer 311, a protective layer 312, an insulating layer 313, and a conductive layer 314. The treatment layer 311 is a chrome-plated coating, and the protective layer 312... The coating is polyurethane, the insulating layer 313 is polyvinyl chloride, and the conductive layer 314 is conductive carbon black. Baffles 410 are fixedly connected to both sides of the sliding groove 407 on the surface of the positioning frame 402. The cross-sectional dimensions of the baffles 410 are adapted to the cross-sectional dimensions of the sliding groove 407. A guide rod 406 slides through the upper surface of the limiting frame 403. The bottom end of the guide rod 406 is fixedly connected to the upper surface of the fixing ring 405. Several arc-shaped openings are formed on the upper arc surface of the rotating shaft 404. A number of auxiliary grooves 411 are evenly distributed on the surface of the rotating shaft 404. A bearing ring 401 is fixedly connected to the inner wall surface of the mounting side plate 5 at the position corresponding to the conductive aluminum core 32. The bearing ring 401 is a stainless steel ring with a "U" shaped cross section. The inner wall of the bearing ring 401 abuts against the arc surface of the conductive aluminum core 32. The positioning frame 402 is a rigid plastic frame, and the inner wall size of the positioning frame 402 is adapted to the cross-sectional size of the conductive aluminum core 32.

[0027] The working principle of the multi-layer composite charging roller provided by this utility model is as follows: A high-voltage power supply is connected to the conductive aluminum core 32 of the charging roller. The current is first conducted to the conductive layer 314, i.e., the conductive carbon black layer, which is in close contact with the conductive aluminum core 32. The conductive layer 314 acts as a uniform electric field source, transferring the charge to its outer surface. The insulating layer 313, i.e., the polyvinyl chloride coating, is wrapped around the outside of the conductive layer 314, effectively preventing high voltage from breaking down the outer sleeve 31 or leaking to other components, ensuring operational safety and reliability. Under the action of the high-voltage electric field applied between the charging roller and the photosensitive drum 2, the charge passes through the outermost processing layer 311 and the protective layer 312 and is transferred to the surface of the photosensitive drum 2 in a controlled manner, making it uniformly charged. During this process, the charging roller body 3 passes through the conductive aluminum cores 32 at both ends, and both ends penetrate the inner wall of the "U"-shaped support ring 401 on the mounting side plate 5, and are supported and protected by the support ring 401. At the same time, both ends of the conductive aluminum core 32 are placed in the positioning frame 402 of the adjustment device 4. The support ring 401 provides an initial, stable support point. Through the rotating shaft 404 in the rotation adjustment device 4, driven by a threaded transmission, the rotating shaft 404 is pushed downwards. The fixing ring 405 at the bottom of the rotating shaft 404 moves downwards accordingly, pressing against the conductive aluminum core 32. At this time, the connecting rod 409 and the limiting frame 403, constrained by the guide rod 406, ensure that the fixing ring 405 is pressed vertically downwards without deflection. The C-shaped fixing ring 405, while tightly gripping the conductive aluminum core 32 on its inner wall, also abuts against the surface of the positioning frame 402 at both ends, forming a stable three-point clamping structure: one point on the inner wall of the fixing ring 405 and two points at its ends, firmly locking the conductive aluminum core 32 in the preset position. This position ensures that the outer sleeve 31 of the charging roller body 3 and the surface of the photosensitive drum 2 maintain a small and constant optimal gap.

[0028] The circuits and controls involved in this utility model are all existing technologies and will not be described in detail here.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-layer composite charging roller, characterized in that, include: The drum unit (1) and the adjusting device (4) are provided with a photosensitive drum (2) on the inner wall of the drum unit (1). Mounting side plates (5) are provided on both sides of the drum unit (1). A charging roller body (3) is mounted on the mounting side plate (5) via the adjusting device (4). The charging roller body (3) includes an outer sleeve (31) and a conductive aluminum core (32). The outer sleeve (31) is fitted onto the surface of the conductive aluminum core (32). The charging roller body (3) is located on the inner wall surface of the drum unit (1), and its position corresponds to the position of the photosensitive drum (2). The adjusting device (4) includes a positioning frame (402). One side of the positioning frame (402) is fixedly connected to the surface of the mounting side plate (5). The inner side of the positioning frame (402)... The wall is rotatably connected to the arc surface of one end of the conductive aluminum core (32). The lower surface of the positioning frame (402) is provided with a sliding groove (407). The inner wall of the sliding groove (407) is slidably connected to a slider (408). One end of the slider (408) is fixedly connected to a connecting rod (409). The surface of the connecting rod (409) is fixedly connected to a limit frame (403). The upper surface of the limit frame (403) is threaded through a rotating shaft (404). The bottom end of the rotating shaft (404) is rotatably connected to a fixing ring (405). The cross section of the fixing ring (405) is "C". The inner wall of the fixing ring (405) abuts against the arc surface of the conductive aluminum core (32). The two ends of the fixing ring (405) abut against the surface of the positioning frame (402).

2. The charging roller with a multi-layer composite layer according to claim 1, characterized in that, The outer sleeve (31) includes, from the outside to the inside, a treatment layer (311), a protective layer (312), an insulating layer (313), and a conductive layer (314). The treatment layer (311) is a chromium-plated coating, the protective layer (312) is a polyurethane coating, the insulating layer (313) is a polyvinyl chloride coating, and the conductive layer (314) is a conductive carbon black layer.

3. The charging roller with a multi-layer composite layer according to claim 1, characterized in that, The positioning frame (402) is fixedly connected with baffles (410) on both sides of the slide groove (407), and the cross-sectional dimensions of the baffles (410) are adapted to the cross-sectional dimensions of the slide groove (407).

4. The charging roller with a multi-layer composite layer according to claim 1, characterized in that, The upper surface of the limiting frame (403) is slidably penetrated by a guide rod (406), and the bottom end of the guide rod (406) is fixedly connected to the upper surface of the fixing ring (405).

5. The charging roller with a multi-layer composite layer according to claim 1, characterized in that, The upper arc surface of the rotating shaft (404) is provided with a number of auxiliary grooves (411), and the number of auxiliary grooves (411) are evenly distributed on the surface of the rotating shaft (404).

6. The charging roller with a multi-layer composite layer according to claim 1, characterized in that, A bearing ring (401) is fixedly connected to the inner wall surface of the mounting side plate (5) at the position corresponding to the conductive aluminum core (32). The bearing ring (401) is a stainless steel ring with a "U" shaped cross section. The inner wall of the bearing ring (401) abuts against the arc surface of the conductive aluminum core (32).

7. The charging roller with a multi-layer composite layer according to claim 1, characterized in that, The positioning frame (402) is a rigid plastic frame, and the inner wall size of the positioning frame (402) is adapted to the cross-sectional size of the conductive aluminum core (32).

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