Magnetic roller structure for laser printer

Abstract

The utility model relates to the technology of printer accessories, in particular to a magnetic roller structure for a laser printer. The magnetic roller structure comprises an integrally formed magnetic conductive composite body, honeycomb-shaped reinforcing ribs are evenly distributed on the inner periphery of the magnetic conductance complex. Gradient magnetization modules are uniformly distributed in honeycomb gaps of the honeycomb-shaped reinforcing ribs; a double-spiral heat dissipation channel is arranged on the inner circumference of the honeycomb-shaped reinforcing rib, and the gradient magnetization modules are uniformly distributed around the double-spiral heat dissipation channel; and a wear-resistant layer, a conductive film and a moisture-proof coating sequentially cover the outer surface of the magnetic conductive complex. Assembling errors are eliminated through the integrated forming technology, the shock resistance and heat dissipation performance of the magnetic roller are multiplied through the honeycomb-shaped reinforcing ribs and the double-spiral heat dissipation channels, the magnetic field is more uniform through the gradient magnetization module, and the magnetic roller can stably work in the high-humidity environment through the damp-proof coating.

Description

Technical Field

[0001] This utility model relates to the field of printer accessories technology, specifically a magnetic roller structure for a laser printer. Background Technology

[0002] Traditional printer magnetic rollers employ a modular assembly structure, consisting of a magnetic core, conductive layer, insulating layer, and end caps, joined together via bonding or press-fitting processes. However, this structure has the following drawbacks:

[0003] 1. Poor mechanical stability: Assembly errors cause the magnetic core and the outer shell to be misaligned (coaxiality error ≥0.05mm), which generates centrifugal vibration during rotation, and the magnetic field fluctuation amplitude exceeds 15%, causing stripes in the printed image.

[0004] 2. Thermal expansion mismatch: The difference in thermal expansion coefficients between the magnetic core and the outer shell can easily cause micro-cracks in high-temperature environments, leading to magnetic leakage.

[0005] 3. Signal interference: There is contact resistance (approximately 0.1-0.5Ω) between the separate conductive layer and the magnetic core. When powered by high voltage, electromagnetic noise is generated, which affects the accuracy of the development bias voltage. Utility Model Content

[0006] The purpose of this invention is to provide a magnetic roller structure for laser printers to solve the problems mentioned in the above technical background, such as poor mechanical stability, thermal expansion mismatch, and signal interference in traditional printer magnetic rollers.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a magnetic roller structure for a laser printer, comprising: an integrally formed magnetic induction composite; honeycomb reinforcing ribs uniformly distributed on the inner periphery of the magnetic induction composite; gradient magnetization modules uniformly distributed in the honeycomb gaps of the honeycomb reinforcing ribs; a double helical heat dissipation channel provided on the inner periphery of the honeycomb reinforcing ribs, and the gradient magnetization modules uniformly distributed around the double helical heat dissipation channel; and a wear-resistant layer, a conductive film, and a moisture-proof coating sequentially covering the outer surface of the magnetic induction composite.

[0008] Furthermore, the gradient magnetization module forms an alternating N / S magnetic field with a magnetic induction intensity of 0.2-0.8T. The hexagonal units in the honeycomb reinforcing ribs have a side length of 1.2mm, a wall thickness of 0.5mm, and an arrangement density of 85-90%. The double-helix heat dissipation channel is filled with inert gas, and gas circulation is achieved through a micro-eddy current tube at the end of the magnetic roller. The sheet resistance of the conductive film is ≤10Ω / □. An embedded conductive ring is provided at the other end of the magnetic roller, with a contact resistance ≤0.01Ω.

[0009] The beneficial effects of this invention are as follows: the one-piece molding technology eliminates 100% of assembly errors; the honeycomb reinforcing ribs and double-helix heat dissipation channels greatly enhance shock resistance and heat dissipation performance; the gradient magnetization module achieves a magnetic field uniformity deviation of ≤3%; and the moisture-proof coating allows the magnetic roller to work stably in a 90% humidity environment. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a front sectional view of the present invention;

[0012] Figure 2 This is an enlarged schematic diagram showing the distribution of the honeycomb reinforcing ribs and gradient magnetization modules of this utility model;

[0013] Figure 3 This is a schematic diagram of the double-helix heat dissipation channel structure of this utility model.

[0014] The diagram is marked as follows:

[0015] 1. Magnetic permeability composite; 2. Honeycomb reinforcing ribs; 3. Gradient magnetization module; 4. Double helix heat dissipation channel; 5. Wear-resistant layer; 6. Conductive film; 7. Moisture-proof coating; 8. Micro eddy current tube; 9. Embedded conductive ring. Detailed Implementation

[0016] 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 specific embodiments.

[0017] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0019] like Figure 1 and Figure 2 As shown, a magnetic roller structure for a laser printer includes: an integrally formed magnetically conductive composite 1; honeycomb-shaped reinforcing ribs 2 uniformly distributed inside the magnetically conductive composite 1; gradient magnetization modules 3 uniformly distributed in the honeycomb gaps of the honeycomb-shaped reinforcing ribs 2; a double-helix heat dissipation channel 4 provided inside the honeycomb-shaped reinforcing ribs 2, and the gradient magnetization modules 3 uniformly distributed around the double-helix heat dissipation channel 4; and a wear-resistant layer 5, a conductive film 6, and a moisture-proof coating 7 sequentially covering the outer surface of the magnetically conductive composite 1.

[0020] To ensure uniform magnetic field distribution on the magnetic roller, the gradient magnetization module 3 generates an alternating N / S magnetic field with a magnetic induction intensity of 0.2-0.8T. To ensure the stability of the magnetic roller's main structure, honeycomb reinforcing ribs 2 are provided inside the magnetic permeable composite 1. The hexagonal units in the honeycomb reinforcing ribs 2 have a side length of 1.2mm, a wall thickness of 0.5mm, and an arrangement density of 85-90%. To improve the magnetic roller's heat dissipation performance, the double-helix heat dissipation channel 4 is filled with inert gas, and gas circulation is achieved through a micro-vortex tube 8 at the end of the magnetic roller. To improve the efficiency of developing bias voltage transmission, the sheet resistance of the conductive film 6 is ≤10Ω / □. To ensure accurate transmission of the developing bias voltage, an embedded conductive ring 9 with a contact resistance ≤0.01Ω is provided at the other end of the magnetic roller.

[0021] The fabrication process of the magnetic roller structure for the laser printer is as follows:

[0022] Step 1: Mix the magnetic material powder with the binder, inject it into the mold and cold isostatically press it into shape (pressure 200MPa).

[0023] Step 2: The product from Step 1 is hot isostatically sintered for 4 hours under high temperature and inert gas protection.

[0024] Step 3: Use a five-axis CNC machine tool to precision machine the product from Step 2 into a cylinder with an outer diameter of Φ16±0.003mm and an inner diameter of Φ12±0.01mm.

[0025] Step 4: The cylinder from Step 3 has its inner wall honeycomb structure etched with a laser (0.8mm deep), and a double-helix copper tube is welded in the middle to form a heat dissipation channel.

[0026] Step 5: Sequentially deposit the wear-resistant layer 5, the conductive film 6, and the moisture-proof coating 7 on the outer surface of the cylinder.

[0027] Step 6: Install an embedded conductive ring 9 at the end of the cylinder, and use a pulse magnetic field generator to perform gradient magnetization on the uniformly distributed modules to be magnetized in the honeycomb gaps.

[0028] Through the above technical solutions, the one-piece molding technology eliminates 100% of assembly errors, and the honeycomb reinforcing ribs 2 and double spiral heat dissipation channels 4 greatly enhance shock resistance and heat dissipation performance. The gradient magnetization module 3 achieves a magnetic field uniformity deviation of ≤3%, and the moisture-proof coating 7 enables the magnetic roller to work stably in a 90% humidity environment.

[0029] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0030] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetic roller structure for a laser printer, characterized in that, include: An integrally formed magnetic permeable composite (1); The magnetic permeable composite (1) has honeycomb-shaped reinforcing ribs (2) evenly distributed on its inner circumference; Gradient magnetization modules (3) are evenly distributed in the honeycomb gaps of the honeycomb reinforcing rib (2); The honeycomb reinforcing rib (2) has a double helix heat dissipation channel (4) on its inner circumference, and the gradient magnetization module (3) is evenly distributed around the double helix heat dissipation channel (4); The outer surface of the magnetic permeable composite (1) is sequentially covered with a wear-resistant layer (5), a conductive film (6), and a moisture-proof coating (7).

2. The magnetic roller structure for a laser printer according to claim 1, characterized in that, The gradient magnetization module (3) forms an alternating NS magnetic field with a magnetic induction intensity of 0.2-0.8T.

3. The magnetic roller structure for a laser printer according to claim 1, characterized in that, The hexagonal units in the honeycomb reinforcing ribs (2) have a side length of 1.2 mm, a wall thickness of 0.5 mm, and an arrangement density of 85-90%.

4. The magnetic roller structure for a laser printer according to claim 1, characterized in that, The double-helix heat dissipation channel (4) is filled with inert gas, and the gas is circulated through the micro vortex tube (8) at the end of the magnetic roller.

5. The magnetic roller structure for a laser printer according to claim 1, characterized in that, The sheet resistance of the conductive film (6) is ≤10Ω / □.

6. The magnetic roller structure for a laser printer according to claim 1, characterized in that, The other end of the magnetic roller is provided with an embedded conductive ring (9) with a contact resistance ≤0.01Ω.

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