Novel charging roller

Abstract

The utility model discloses a novel charging roller which comprises a shaft core made of plastic materials, the interior of the shaft core is of a hollow structure, at least one end of the shaft core is provided with a through hole, a metal end cap is inserted into the through hole, an inner framework is arranged in the shaft core, the end portion of the inner framework is connected with the metal end cap, and a conductive coating is coated on the outer wall of the shaft core. According to the utility model, the shaft core of the charging roller is made of a plastic material and is designed into a hollow structure, so that the weight of the charging roller is obviously reduced, the load of printing or copying equipment in operation is reduced, the energy consumption is reduced, and the service life of the equipment is prolonged. The inner framework in the inner cavity of the shaft core is composed of the heat dissipation framework and the anti-twisting framework in a crossed mode, through the spiral forming design, the strong and effective anti-twisting capacity is provided, the good heat dissipation performance is guaranteed in cooperation with the metal end caps, and meanwhile the stability of the shaft core is further improved.

Description

Technical Field

[0001] The utility model relates to the field of accessories for printing or copying equipment, and particularly to a novel charging roller. Background Art

[0002] The charging roller is a key component in printers and copiers, mainly responsible for applying a uniform charge to the photosensitive drum to ensure the accurate formation and transmission of images. The existing charging roller structure usually includes a metal roller shaft, usually made of stainless steel or aluminum alloy, to provide mechanical strength and support. Outside the metal roller shaft, there is a rubber buffer layer, usually made of silica gel or polyurethane, to provide moderate elasticity to improve contact with the photosensitive drum and ensure uniform charging. The outside of the rubber buffer layer is coated with a conductive layer, and the materials are mostly carbon black-filled polymers, conductive polymers or metal powder-filled materials to ensure that the charging roller has the required conductivity. During the printing or copying process, the charging roller contacts and rotates with the photosensitive drum to uniformly apply charges to the surface of the photosensitive drum. After the surface of the photosensitive drum is uniformly charged, a laser beam or an LED light source exposes it to form a latent electrostatic image. Subsequently, toner (carbon powder) is adsorbed to the electrostatic image area under the action of the developing roller to form a visible image. Finally, through heating and fixing by the fixing roller, a permanent printing or copying result is finally formed.

[0003] Most of the roller shafts of the existing charging rollers are made of all-metal. Although the roller shafts made of metal have their unique advantages in some applications, such as high strength and durability. However, in the charging rollers of printers and copiers, there are obvious disadvantages. First of all, the all-metal roller shaft is relatively heavy. Metal materials such as stainless steel or aluminum alloy have a high density and large weight, resulting in a large load during the operation of printing or copying equipment, thus increasing the mechanical stress during the operation of printers and copiers and raising the energy consumption. And the heavier charging roller will accelerate the wear of the internal mechanical friction parts of the equipment, shorten the service life of the equipment, and increase the maintenance and replacement costs.

[0004] Secondly, when the charging roller works, it needs to be close to and continuously rotate with the photosensitive drum, which will cause friction to generate heat. The all-metal roller shaft has a high coefficient of thermal expansion, and the accumulated heat during the working process will cause the metal roller shaft to expand, affecting its contact accuracy with the photosensitive drum, thus resulting in uneven charging. Long-term heat accumulation may also cause thermal deformation of the metal roller shaft, affecting the stability of the charging roller and the printing quality.

[0005] In addition, the manufacturing cost of the all-metal roller shaft is relatively high, and precise processing technology is required during manufacturing, which will undoubtedly increase the overall cost of printing or copying equipment.

[0006] Therefore, the existing charging rollers need further optimization and improvement. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide a new type of charging roller made of plastic for the roller shaft, which has high strength and good heat dissipation performance.

[0008] To achieve the above object, the present utility model adopts the following solution: a new type of charging roller, including a shaft core made of plastic material, the shaft core is of a hollow structure, at least one end of the shaft core has a through hole communicating with the hollow inner cavity of the shaft core, a metal end cap is inserted on the through hole, a metal inner skeleton is arranged in the hollow inner cavity of the shaft core, the end of the inner skeleton is connected with the metal end cap, a conductive coating is applied on the outer wall of the shaft core, and the conductive coating can provide good electrical conductivity to ensure the stable electrical performance of the charging roller during operation. A rubber layer is arranged on the circumferential outer wall of the conductive coating and in the middle section of the shaft core for being close to and continuously rotating with the photosensitive drum. The shaft core made of plastic material is lighter in weight than the metal material, which can effectively reduce the overall weight of the charging roller, reduce the load during the operation of the printing or copying device, and reduce mechanical stress and energy consumption. And the manufacturing cost of the plastic material is relatively low, and the processing technology is relatively simple, which can reduce the manufacturing cost. The hollow structure can further reduce the weight of the charging roller, help dissipate heat while reducing the equipment load, reduce expansion and thermal deformation caused by heat accumulation, and improve the stability and printing quality of the charging roller.

[0009] As a further solution of the present utility model, the inner skeleton includes a heat dissipation skeleton extending along the hollow inner cavity of the axis core and the anti-twist skeleton. The heat dissipation skeleton is formed into a sheet-like spiral shape, and the anti-twist skeleton is formed into a sheet and spirally penetrates through the center of the heat dissipation skeleton in a spiral direction opposite to that of the heat dissipation skeleton. At least one end of the heat dissipation skeleton and the anti-twist skeleton abuts against the metal end cap together. The connection between the metal end cap and the inner skeleton can effectively conduct the heat in the axis core to the metal end cap and dissipate it. The design of the heat dissipation skeleton formed into a sheet-like spiral shape enables the heat dissipation skeleton to extend along the hollow inner cavity of the axis core and cover a larger surface area. Due to the spiral shape having a larger contact area and open space, it can more effectively dissipate the internal heat to the external environment through the metal end cap. In addition, the spiral-shaped skeleton can guide the air flow, thereby enhancing the heat dissipation effect. When the air flows in the spiral structure, a natural convection will be formed, and this convection effect helps to accelerate the heat dissipation and improve the heat dissipation efficiency. Secondly, the anti-twist skeleton spirally penetrates through the center of the heat dissipation skeleton in a spiral direction opposite to that of the heat dissipation skeleton. This interpenetrating design provides additional support and stability. The presence of the anti-twist skeleton enhances the anti-torsion performance of the axis core and prevents the plastic axis core from being twisted and deformed during operation. The spiral-shaped anti-twist skeleton ensures the stability of the axis core when bearing torque by increasing the rigidity and strength of the structure, thereby improving the reliability of the overall structure. Through the spiral design of the heat dissipation skeleton and the anti-twist skeleton, they can maintain the structural strength, provide the necessary support, and at the same time, do not hinder the heat conduction and dissipation, avoiding the heat dissipation problems that may be brought by the traditional solid structure. The gap in the middle of the spiral structure helps to form an effective heat dissipation channel, enabling the heat to be quickly conducted from the inside to the outside, thereby maintaining the temperature stability of the entire charging roller during operation.

[0010] As a preferred solution of the present utility model, a plurality of radial compression-resistant frames are sequentially sleeved outside the heat dissipation skeleton at intervals. The inner side wall of the radial compression-resistant frame is connected to the spiral outer edge of the heat dissipation skeleton, and the outer side wall of the radial compression-resistant frame is connected to the inner cavity wall of the axis core. The radial compression-resistant frame can improve the compression resistance of the axis core, prevent deformation, and enhance the stability of the overall structure.

[0011] As a further solution of the present utility model, the radial compression-resistant frame is pentagonal, and a plurality of connecting rods are connected between the radial compression-resistant frames. The connecting rods increase the anti-bending ability and stability of the overall structure of the axis core.

[0012] As a further solution of the present utility model, on the inner cavity wall of the axis core near the through hole and on the outer wall of the metal end cap inserted into the through hole, there are respectively provided plug-in fixing parts that can cooperate with each other to fix the metal end cap on the end of the axis core.

[0013] As a preferred embodiment of the present utility model, the plug-in fixing part includes a convex ring provided on the inner cavity wall of the shaft core and an inner groove circumferentially provided on the outer wall of the metal end cap. When the metal end cap is inserted into the through hole, the convex ring is embedded in the inner groove, which greatly facilitates the assembly and production convenience in this way.

[0014] As a preferred embodiment of the present utility model, the shaft core is made of polyurethane material which is easy to process, capable of improving the manufacturing efficiency and reducing the cost.

[0015] As a preferred embodiment of the present utility model, after the metal end cap is inserted into the through hole, the conductive coating wraps the metal end cap.

[0016] As a further embodiment of the present utility model, ventilation holes are penetrated through one end of the metal end cap and / or one end of the shaft core. The ventilation holes can provide good heat dissipation and pressure relief effects, prevent internal heat accumulation and excessive pressure, and ensure the stability and service life of the charging roller.

[0017] In summary, the beneficial effects of the present utility model compared with the prior art are as follows: By making the shaft core of the charging roller from plastic material and designing it into a hollow structure, the present utility model significantly reduces the weight of the charging roller, reduces the load and mechanical stress during the operation of the printing or copying device, thereby reducing energy consumption and extending the service life of the device, while reducing the maintenance and replacement costs. The use of plastic material also reduces the manufacturing cost and simplifies the processing technology. The metal end cap at the end of the shaft core cooperates with the heat dissipation skeleton to provide effective heat dissipation performance. The inner skeleton is composed of the cross of the heat dissipation skeleton and the anti-twist skeleton, and through the spiral forming design, it provides strong and effective anti-twist ability while ensuring good heat dissipation performance, further improving the stability of the shaft core. The design of the radial compression-resistant frame and the connecting rod sleeved on the heat dissipation skeleton enhances the compression-resistant and anti-bending abilities of the shaft core, prevents the shaft core from deforming, and ensures the stability of the overall structure of the charging roller. In addition, the shaft core is preferably made of polyurethane material, which can have good elasticity and durability. The conductive coating coated on the outer surface of the shaft core not only provides good electrical conductivity, but also protects the metal end cap and extends the service life of the charging roller. The design of the ventilation holes further optimizes the heat dissipation and pressure relief effects, prevents internal heat accumulation and excessive pressure, and ensures the stability of the charging roller. Through these optimized designs, the new charging roller effectively solves the problems existing in the traditional charging roller, such as large weight, high energy consumption, fast wear, expansion and deformation, etc., improves the performance and service life of the charging roller, and reduces the manufacturing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a sectional view of the present utility model along the length direction.

[0019] Figure 2 is Figure 1Enlarged view of location A in [the figure].

[0020] Figure 3 One of the sectional views of one end of the present utility model.

[0021] Figure 4 Another sectional view of one end of the present utility model.

[0022] Figure 5 is Figure 4 Enlarged view of location B in [the figure].

[0023] Figure 6 Exploded view of the shaft core of the present utility model.

[0024] Explanation of reference numerals in the drawings: 1. Shaft core; 2. Metal end cap; 3. Inner skeleton; 4. Conductive coating; 5. Rubber layer; 6. Plug-in fixing part; 7. Vent hole; 11. Through hole; 31. Heat dissipation skeleton; 32. Anti-twist skeleton; 33. Radial compression frame; 34. Connecting rod; 61. Convex ring; 62. Inner groove. Detailed implementation manners

[0025] The following specific implementation contents provide multiple different embodiments or examples for implementing the present utility model. Of course, these are only embodiments or examples and are not intended to be restrictive. Additionally, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the present invention and do not represent a specific relationship between the different embodiments and / or structures being discussed.

[0026] Furthermore, spatially relative terms such as "below", "lower side", "from the inside out", "above", "upper side" and similar terms may be used. These relational terms are for facilitating the description of the relationship between some elements or features in the drawings and other elements or features. These spatial relational terms include different orientations of the device during use or operation, as well as the orientations described in the drawings. The device may be rotated 90 degrees or to other orientations, and the spatially relative adjectives used may be interpreted accordingly. Therefore, it should not be construed as a limitation to the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0027] The present utility model will be further described below in conjunction with the description of the drawings and the detailed implementation manners: As Figures 1 to 6A novel charging roller shown in the figure includes a shaft core 1 made of plastic material. In this embodiment, the shaft core 1 is preferably made of polyurethane material which is easy to process, capable of improving manufacturing efficiency and reducing costs. The shaft core 1 has a hollow structure inside, and at least one end of the shaft core 1 has a through hole 11 communicating with the hollow inner cavity of the shaft core 1. A metal end cap 2 is inserted into the through hole 11. Plug-in fixing parts 6 are respectively provided on the inner cavity wall of the shaft core 1 near the through hole 11 and on the outer wall of the metal end cap 2 inserted into the through hole 11, which can cooperate with each other to fix the metal end cap 2 on the end of the shaft core 1. In this embodiment, the fixing part 6 includes a convex ring 61 provided on the inner cavity wall of the shaft core 1 and an inner groove 62 provided around the circumferential outer wall of the metal end cap 2. When the metal end cap 2 is inserted into the through hole 11, the convex ring 61 is embedded in the inner groove 62, which greatly facilitates the assembly and production convenience in this way. A metal inner skeleton 3 is provided in the hollow inner cavity of the shaft core 1, and the end of the inner skeleton 3 abuts against the metal end cap 2. After the metal end cap 2 is inserted into the through hole 11, the shaft core 1 and the metal end cap 2 are wrapped together by coating a conductive coating 4. The conductive coating mixture is evenly coated on the surface of the plastic shaft core 1 by spraying, brushing or dipping. After coating, it is preliminarily dried at room temperature and then cured in an oven at 60 - 80°C for 1 - 2 hours. After curing, a rubber layer 5 is sleeved on the middle section of the shaft core 1.

[0028] Among them, as Figures 1 to 6As shown, the inner skeleton 3 includes a heat dissipation skeleton 31 extending along the hollow inner cavity of the shaft core 1 and the anti-twist skeleton 32. The heat dissipation skeleton 31 is formed into a sheet-like spiral shape. The anti-twist skeleton 32 is also in the form of a sheet and spirally penetrates through the center of the heat dissipation skeleton 31 in a spiral direction opposite to that of the heat dissipation skeleton 31. The spiral outer edge of the anti-twist skeleton 32 is fitted with the spiral inner edge of the heat dissipation skeleton 31. This interpenetrating design provides additional support and stability. The presence of the anti-twist skeleton 32 in cooperation with the heat dissipation skeleton 31 enhances the anti-torsion performance of the shaft core 1, preventing the plastic shaft core 1 from being twisted and deformed during operation. At least one end of the heat dissipation skeleton 31 and the anti-twist skeleton 32 abuts against the metal end cap 2. A ventilation hole 7 penetrates through one end of the metal end cap 2 and one end of the shaft core 1. It should be noted that when only one end of the shaft core 1 is equipped with the metal end cap 2, ventilation holes 7 are respectively penetrated through the end of the shaft core 1 far from the metal end cap 2 and the metal end cap 2 and are communicated with the hollow inner cavity of the shaft core 1. However, when metal end caps 2 are installed at both ends of the shaft core 1, the ventilation holes 7 are respectively arranged at the axles of the metal end caps 2. The spiral-shaped heat dissipation skeleton 31 and the anti-twist skeleton 32 can guide the air flow, thereby enhancing the heat dissipation effect. When the air enters the hollow inner cavity of the shaft core 1 through the ventilation hole 7 at one end and flows in the spiral structure, it flows out through the ventilation hole 7 at the other end, forming a natural convection. This convection effect helps to accelerate the heat dissipation and improve the heat dissipation efficiency.

[0029] In addition, a number of radially compressive frames 33 are sequentially and spacedly sleeved outside the heat dissipation skeleton 31. The radially compressive frames 33 are pentagonal. The inner side wall of the radially compressive frames 33 is connected to the spiral outer edge of the heat dissipation skeleton 31, and the outer side wall of the radially compressive frames 33 is connected to the inner cavity wall of the shaft core 1. The pentagonal structure provides excellent stability. Its multi-sided design can evenly disperse the stress applied to the radially compressive frames 33, reduce the single-point stress concentration, and significantly improve the overall compressive capacity and anti-torsion performance. In terms of mechanical properties, the pentagonal structure can resist torsional stress better than circular and quadrilateral shapes, maintain the shape and position of the shaft core 1, and ensure the stability of the charging roller during operation. The sequentially and spacedly arranged radially compressive frames 33 can optimize the material distribution, not only improving the strength and rigidity of the frames, but also reducing material waste, thereby reducing the manufacturing cost. Furthermore, it improves the compressive capacity of the shaft core 1, prevents deformation, and enhances the stability of the overall structure. In addition, the design of the pentagonal radially compressive frames 33 also helps with heat dissipation. The internal voids form effective heat dissipation channels, promoting air circulation, improving the heat dissipation efficiency, and preventing the shaft core 1 from overheating. In addition, a plurality of connecting rods 34 are connected between the radially compressive frames 33, increasing the anti-bending ability and stability of the overall structure of the shaft core 1.

[0030] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel charging roller, comprising a shaft core (1) made of plastic material, wherein the shaft core (1) is hollow, and characterized in that: At least one end of the shaft core (1) has a through hole (11) communicating with the hollow inner cavity of the shaft core (1); a metal end cap (2) is inserted into the through hole (11); an inner skeleton (3) made of metal is provided in the hollow inner cavity of the shaft core (1); the end of the inner skeleton (3) is connected to the metal end cap (2); a conductive coating (4) is coated on the outer wall of the shaft core (1); and a rubber layer (5) is provided on the circumferential outer wall of the conductive coating (4) and located in the middle section of the shaft core (1).

2. A novel charging roller according to claim 1, characterized in that: The inner skeleton (3) comprises a heat dissipation skeleton (31) and an anti-twist skeleton (32) extending along the hollow inner cavity of the shaft core (1); the heat dissipation skeleton (31) is spirally formed in a sheet shape; the anti-twist skeleton (32) is sheet-shaped and spirally penetrates the center of the heat dissipation skeleton (31) in an opposite spiral direction to the heat dissipation skeleton (31); at least one end of the heat dissipation skeleton (31) and the anti-twist skeleton (32) are in contact with the metal end cap (2).

3. A novel charging roller according to claim 2, characterized in that: A plurality of radial pressure-resistant frames (33) are sequentially spaced outside the heat dissipation skeleton (31); the inner side walls of the radial pressure-resistant frames (33) are connected to the spiral outer edges of the heat dissipation skeleton (31); and the outer side walls of the radial pressure-resistant frames (33) are connected to the inner cavity wall of the shaft core (1).

4. A novel charging roller according to claim 3, characterized in that: The radial pressure-resistant frames (33) are pentagonal in shape, and a plurality of connecting rods (34) are connected between the radial pressure-resistant frames (33).

5. A novel charging roller according to any one of claims 1 to 4, characterized in that: On the hollow inner wall of the shaft core (1) close to the through hole (11) and on the outer wall of the metal end cap (2) inserted into the through hole (11) are respectively provided plug-in fixing parts (6) which can cooperate with each other to fix the metal end cap (2) to the end of the shaft core (1).

6. A novel charging roller according to claim 5, characterized in that: The plug-in fixing portion (6) comprises a convex ring (61) arranged on the inner cavity wall of the shaft core (1) and an inner groove (62) arranged around the circumferential outer wall of the metal end cap (2); when the metal end cap (2) is inserted into the through hole (11), the convex ring (61) is embedded in the inner groove (62).

7. A novel charging roller according to claim 1, characterized in that: The shaft core (1) is made of polyurethane material.

8. A novel charging roller according to claim 6, characterized in that: After the metal end cap (2) is inserted into the through hole (11), the conductive coating (4) wraps around the metal end cap (2).

9. A novel charging roller according to claim 6, characterized in that: An air hole (7) is formed through one end of the metal end cap (2) and / or one end of the shaft core (1).

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