KR20000000960A - Developing member of developing device and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A developing member is provided to increase image density, hardly generate pollution of the surface and easily remove the pollution of the surface. CONSTITUTION: The developing device has; a magnet member(4) installed inside; regularity devices(7,7') makes a developer that attached on the surface(3) regular to the same thickness; a cylindrical aluminum bar(11) processed intensity of illumination of the surface to 8um or 13um through the polishing device; and a gilding layer(12) of metal formed on the surface of the aluminum bar to the same thickness.

Description

Developing member of developing device and manufacturing method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing member using a one-component magnetic developer in an image forming apparatus for forming an image using an electrostatic latent image, the developing member carrying a developer to a photosensitive member and developing the same.

A developer (toner) for developing an image in an image forming apparatus such as a copier, a laser printer, or a facsimile is a two-component developer that includes a developer and a carrier particle separately, and a one-component developer that does not include a carrier separately. Are distinguished. Recently, according to the popularization of the process cartridge type image forming apparatus including the developing apparatus and the miniaturization of the image forming apparatus, the developing apparatus using the one-component mold which is relatively smaller in size than the method using the binary developer. Image forming apparatuses having a widespread use are widely used.

In addition, the one-component developer is charged to a polarity suitable for developing the latent image by friction, and is carried and developed by the developing member toward the electrostatic latent image member, but the one-component magnetic material containing iron (Fe) in the developer is developed. It is divided into a developer and a one-component nonmagnetic developer containing no iron (Fe) component.

Therefore, according to each developer, in the case of a developing device using a one-component magnetic developer even in the construction of the developing device, a magnet or an electric element is formed inside a cylindrical developing member made of aluminum, stainless steel or brass nonmagnetic metal. The magnet member having magnetic force is positioned to convey the developer to the electrostatic latent member side, and in the case of the one-component non-magnetic developer, a developer is used such that a surface is formed like a sponge by using a resin or the like. .

The present invention is directed to a developing member and a manufacturing method thereof in a developing apparatus using a one-component magnetic developer.

Since the one-component magnetic developer includes an iron (Fe) component in the developer, the developer 3 stored in the developer storage unit 2 may be configured as shown in FIGS. 1 and 2. Is rotated by the rotation of the developing member 5 provided with the magnet member 4 to have a polarity suitable for developing a latent image, and the developer 3 having the polarity is caused by the magnetic force of the magnet member 4. Of the developer 3 attached to the developing member 5 by a regulating member 7, 7 ′ attached to the surface of the developing member 5 and rotating in the direction A of the drawing, and in contact with the developing member 5. The developer 3 is electrostatically discharged by an electric force in the developing zone 6 where the thickness is controlled to be thin and constant and is moved toward the electrostatic latent image member 1 having an electrical latent image and rotating in the direction B in the drawing. It is transferred to the latent image member 1 to form an image, and the developer 3 which is not transferred is again Funeral is recovered in a storage unit (2).

In this case, the magnet member 4 may be configured as a device having a magnetic force or by placing a magnet having a constant magnetic force, the developing member 5 is made of aluminum or stainless steel, brass, etc. Consists of a cylindrical rod made of non-magnetic metal, but the surface roughness (D1) is 8㎛ to 13㎛ by grinding the surface with a sand blast for stable transport of the developer (3), the control member (7, 7 ') is composed of an elastic rubber such as urethane rubber and silicone rubber or a nonmagnetic metal plate having elastic force.

For reference, in the case of the one-component non-magnetic developer, since the developer does not contain iron (Fe), the magnet member is not required inside the developing member. Instead, the electrostatic latent member is attached by attaching the developer to the surface. In order to move to the developer's surface, the surface is composed of elastic resin such as rubber to form a sponge so that the developer is attached to the surface.

In recent years, as the process cartridge type image forming apparatus in which the developing device is integrated is widely used, the material of the developing member 5 using the one-component magnetic developer is easier to process than other metals, and the price is very low. Aluminum is widely used.

In the case of using the material of the developing member 5 as aluminum, there is a problem in that the aluminum surface is oxidized in contact with air to form a non-insulating corrosion layer of alumina, and the surface of the developing member is roughly processed to transport the developer. When the roughness is 5 탆 or less, a problem arises in developing, in which the developer carrying capacity of the developing member is reduced.

Therefore, when the surface roughness of the developing member 5 is 15 µm or more, the image quality is deteriorated. Therefore, the developing member 5 is generally processed to have a thickness of 8 µm to 13 µm. As described above, the surface roughness D1 of the initial surface line 8 is in a state of satisfying 8 µm to 13 µm.

However, the developing member 5 is subjected to the friction of the aluminum surface and the friction with the regulating members 7 and 7 'contacted to regulate the thickness of the developer 3 on the surface while performing the repeated developing process. Because of the wear, the upper surface is worn like the late surface line 9 in FIG. 4, and the fine developer particles 10 are fixed between the bones so that the surface roughness D2 is lowered so that the amount of the developer 3 is reduced. Therefore, there is a problem that the image is blurred and difficult to use for a long time.

In the conventional process cartridge, the amount of developer accommodated in a limited space is about 10,000 sheets based on the paper size A4. Therefore, it is possible to use a developer member made of only aluminum capable of developing about 10,000 sheets. In recent years, although the development of developer manufacturing technology has increased the same amount of developer as the developer, the durability of the developing member due to aluminum cannot keep up with this problem, it is necessary to use expensive stainless steel. have.

In addition, since the aluminum surface is polished by sandblasting or the like to have a rough and sharp shape, a flaw is generated in the contact surfaces of the regulating members 7 and 7 'so that a certain developer thickness is not regulated, or the regulating members 7 and 7 Friction between the contact surface of ') and developer (3) increases, so that the image density decreases due to the increase of the frictional charge of the developer. There is a problem such as not.

The present invention uses a cylindrical rod made of aluminum material sandblasted polishing the developing member of the developing device using a one-component developer, the surface of the metal layer is excellent in wear resistance, corrosion resistance, uniformity, lubricity By the thickness, the wear of the surface is greatly reduced, the development durability is improved, the damage of the regulating member is prevented, the image density is improved by appropriately frictional force with the regulating member, and the contamination of the surface is less likely to occur. It is an object of the present invention to provide a developing member and a method of manufacturing the same, which are easy to remove even when contamination occurs on the surface.

1 is a block diagram of a developing apparatus using a conventional one-component magnetic developer,

2 is another configuration diagram of a developing apparatus using a conventional one-component magnetic developer,

3 is an enlarged view of an initial surface of a developing member of a conventional developing apparatus;

4 is an enlarged view of the surface after using the developing member of the conventional developing apparatus,

5 is a configuration diagram of a developing member of the developing apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

1: electrostatic latent member 2: developer storage

3: developer 4: magnet member

5, 15: developing member 6: developing zone

7: Regulating member 8: Initial surface line

9: late surface line 10: fine developer particle

11 aluminum rod 12 plating layer

D1, D2, D3: Surface Roughness E: Plating Layer Thickness

In order to achieve the above object, the present invention is located in correspondence with an electrostatic latent member having an electrical latent image, and carries a one-component magnetic developer for development, wherein a magnetic member is provided therein, and a developer attached to a surface thereof. A developing member of a developing apparatus in contact with a regulating means for regulating a uniform thickness, the developing member comprising: a cylindrical aluminum rod processed to a surface roughness of 8 µm to 13 µm through polishing means; It provides a developing member that is composed of a plating layer of a metal formed to a predetermined thickness on the surface of the aluminum rod.

In addition, the present invention is located in correspondence with the electrostatic latent image member having an electrical latent image, and carries a one-component magnetic developer for development, provided with a magnetic member therein, the developer attached to the surface in a uniform thickness In the developing member manufacturing method of the developing apparatus which is in contact with the regulating means for regulating, the surface roughness is processed into a cylindrical aluminum rod by polishing means from 8 탆 to 13 탆, and a metal plating layer is formed on the surface with a constant thickness. Provided are a method for manufacturing a developing member of a developing device.

Hereinafter, with reference to the accompanying Figure 5 will be described in detail the present invention.

5 is a configuration diagram of a developing member of a developing apparatus according to the present invention.

In the figure, 11 is an aluminum rod, 12 is a plating layer, and 15 is a developing member.

An electrostatic latent image member 1 is provided in the image forming apparatus, in which a constant charge layer is formed, and a portion of the image which receives light by a laser light or a halogen lamp changes an electric charge to support an electrical image. In order to develop the electrical latent image formed on the member 1, a developing apparatus for carrying the developer 3 at a position corresponding to the electrostatic latent image member 1 is provided.

The developing device is configured differently depending on the developer used. However, when the one-component magnetic developer 3 is used, the developing device includes a magnet member 4 having a magnetic force by a magnet or an electrical force therein. As the member 15 rotates to cause friction in contact with the developer 3, the developer 3 has a polarity suitable for development and is attached to the surface of the developing member 15 by the magnet member 4. Regulating means (7, 7 ') which is conveyed to the electrostatic latent member (1) side, and composed of elastic pieces made of urethane rubber or silicone rubber or elastic pieces made of non-magnetic metal such as phosphor bronze and stainless steel in the process of conveying. ) Is pressed against the surface of the developing member 15, and the polarity is further increased by friction with the developer 3 while maintaining the thickness of the developer 3 adhered to the surface, thereby increasing the amount of charged charge of the developer. Therefore, in the state where the developer is more stably attached to the surface of the developing member 15, the developer adhered to the surface reaches the developing zone 6 by the rotation of the developing member 15, so that the electrostatic latent member 1 The developer 3 is transferred to the latent latent image to develop.

The developing member 15 of the present invention which performs such a developing process comprises a cylindrical aluminum rod 11 so that the magnet means 4 is positioned therein using aluminum which is inexpensive and easy to process, and the surface thereof. In the state that the developer (3) is attached to the surface is processed by a grinding means such as sandblast (Sandblast) for spraying fine sand so that the surface is not slipped, preferably surface roughness of 5㎛ In this case, the carrying capacity of the developer (3) is lowered, and in the case of 15 µm or more, a problem occurs in maintaining a stable image quality. Therefore, the surface roughness (D3) is configured to be 8 µm to 13 µm. The plating layer 12 made of a metal such as nickel or chromium having better wear resistance, corrosion resistance, uniformity and lubricity is formed to have a constant thickness.

In this case, the plating layer 12 is preferably nickel (Ni) plating, the plating effect is reduced when the plating layer thickness (E) is 2㎛ or less, and the final surface roughness is 8㎛ by the plating layer 8㎛ or more To 13 mu m is not satisfied, or the irregular state of the surface is smoothed so that the problem of lowering the carrying capacity of the developer 3 occurs, so that the thickness is set to 3 mu m to 6 mu m.

A comparative test was carried out for developing durability using the developing member 15 and the conventional developing member 5 according to the present invention configured as described above, respectively.

For HP4V, which is a laser printer of Hewlett Packard, using a conventional developing member 5 and a developing member 15 according to the present invention having a plating layer 12 formed on its surface, each of paper size A4 5 As a result of repeating the development using the% concentration chart and measuring the surface roughness, the durability was tested. In the case of the conventional developing member 5 which was simply made of aluminum rod, the initial surface roughness D1 was 12 μm. The surface roughness after performing 5,000 phenomena is 9 占 퐉, and the surface roughness after performing 10,000 phenomena is 5 占 퐉. The initial surface roughness of the developing member 15 subjected to nickel (Ni) plating having a thickness of 4 µm (E) in the state where (D3) was 12 µm was 10 µm, and 5,000 developments were performed under the same experimental conditions. Surface roughness after 9㎛, which performed 10,000 times The surface roughness was 9㎛, showing that there was almost no change in the surface roughness, and there was almost no change in the image state during the 50,000 times of development, and the surface roughness was measured after the 50,000 times of development. As a result, it was found that the development durability was very excellent compared to the conventional developing member at 7㎛.

In addition, also in the density of the image, in the state where the conventional developing member 5 is used, the image concentration is 1.35 (ID), while the developing member 15 according to the present invention having the plating layer 12 formed on the surface is used. In this case, a clearer image was obtained with an image density of 1.5 (ID), and in the case of developing using the conventional developing member 5 also in the deposition amount of the developer, it was 41.45 g / K sheets. In the case of developing by using the developing member 15, it can be seen that the increase was about 25. 51.95 g / K sheets.

This means that the developing member 15 according to the present invention supplies more developer to the electrostatic latent member 1 than the conventional developing member 5. By smoothing the friction with the restricting members 7 and 7 'which are press-contacted, the amount of charge charges due to the frictional charge generated instantaneously by the rough surface of the conventional developing member 5 increases, and the developing member 5 And the electrostatic force increases between the regulating member 7 and 7 ', thereby preventing the amount of the developer 3 from moving toward the electrostatic latent member 1 and reducing the frictional charge appropriately. 1) By increasing the amount of movement of the developer 3 toward the side, the amount of developer deposition is increased, and the image density is high.

In addition, the conventional developing member 5, which simply sandblasted the surface, is easily contaminated when the worker touches the rough surface by hand or during a repair process, and once removed, it is very difficult to remove it. In the case of the developing member 15, even if it is contaminated, it is easily removed even if it is contaminated.

In addition, by forming a plating layer having good lubricity on the surface of the developing member, it is possible to prevent the formation of a corrosion layer caused by oxidation with air due to the characteristics of aluminum, and to prevent damage to the joint surface of the pressurizing control means. It is possible to prevent the occurrence of the ghost image by preventing the accumulation of fine developer accumulates between the grooves on the surface of the developing member can realize excellent image quality.

Therefore, the developing member according to the present invention realizes excellent image quality without using expensive stainless steel, and uses a low-cost and easy-to-process aluminum material, and has high durability and prevention of contamination and easy removal of contamination. Increase the convenience of

The developing member according to the present invention, which is constructed and operated as described above, uses a low-cost and easy-to-process aluminum while forming a plating layer of metal having excellent wear resistance, corrosion resistance, uniformity, and lubricity on its surface, thereby improving the life of the product. Extends, prevents damage to the mating surface of the regulating member, raises the density of the image and regulates the developer uniformly to maintain the initial image quality, reduces the occurrence of contamination on the surface and facilitates the decontamination, It is effective to prevent surface corrosion.

Claims (6)

It is located in correspondence with the electrostatic latent member 1 having an electrical latent image, and carries a one-component magnetic developer 3 for development, and a magnet member 4 is provided therein, and a developer attached to the surface ( In the developing member of the developing apparatus which is in contact with the regulating means (7, 7 ') regulating 3) to a uniform thickness, A cylindrical aluminum rod 11 having a surface roughness of 8 μm to 13 μm through grinding means; The developing member of the developing apparatus, characterized in that the metal plating layer (12) is formed on the surface of the aluminum rod (11) with a predetermined thickness. The developing member of a developing apparatus according to claim 1, wherein the plating layer (12) of the aluminum rod (12) is made of nickel (Ni) having a thickness of 3 µm to 6 µm. The developing member of a developing apparatus according to claim 1 or 2, wherein the polishing means for polishing the surface of the aluminum rod (11) is made by sandblasting. It is located in correspondence with the electrostatic latent member 1 having an electrical latent image, and carries a one-component magnetic developer 3 for development, and a magnet member 4 is provided therein, and a developer attached to the surface ( In the manufacturing method of the developing member of the developing apparatus which the control means 7 and 7 'which regulate 3) to a uniform thickness contact | connects, The developing member of the developing apparatus, characterized in that the surface roughness is processed to 8 μm to 13 μm on the cylindrical aluminum rod 11 through polishing means, and a metal plating layer 12 is formed on the surface to form a predetermined thickness. Manufacturing method. The method of manufacturing a developing member of a developing apparatus according to claim 4, wherein the plating layer (12) is made of nickel (Ni) plating having a thickness of 3 µm to 6 µm. The method of manufacturing a developing member of a developing apparatus according to claim 4 or 5, wherein the polishing means for polishing the surface of the aluminum rod (11) is sand blast.