KR100544477B1 - Apparatus for regulating toner layer of developing roller - Google Patents

Abstract

Disclosed is a toner layer regulating apparatus for a developing roller which constantly regulates the amount of toner supplied to the developing roller side, and regulates the toner layer of the developing roller constant to obtain a high quality image. The developing roller toner layer regulating apparatus according to the present invention has a first elasticity fixed to one side of a predetermined housing to have a predetermined elastic force and adjacent to the surface of the developing roller so as to constantly regulate the toner layer on the surface of the developing roller. blade; And a second blade elastically pressurizing the first blade toward the developing roller side such that the first blade is constantly adjacent to the developing roller side.

Developing roller, toner, blade, regulation, supply roller, burn

Description

Toner Layer Regulator of Developing Roller {APPARATUS FOR REGULATING TONER LAYER OF DEVELOPING ROLLER}

1 is a view schematically showing a conventional image forming apparatus, and

2 is a view for showing a toner layer regulating apparatus of a developing roller according to a preferred embodiment of the present invention.

3 is a partially enlarged view for showing the operation of the toner layer regulating device of the developing roller according to the present invention.

<Description of Symbols for Major Parts of Drawings>

1; photosensitive drum 2; housing

5; toner 6; developing roller

8; feeding roller 13; fixing member

14; first blade 15; second blade

The present invention relates to an electrophotographic image forming apparatus using a one component nonmagnetic toner (hereinafter referred to as a toner). More specifically, the toner layer of a developing roller is regulated by a constant pressure and force. A toner layer regulating device for a developing roller that is supplied to a photosensitive drum is provided.

In general, the developing roller of the image forming apparatus uses a blade having a predetermined shape in contact with the surface of the developing roller to form a constant toner layer. The blade may be used with a metal material, rubber material or a metal material and rubber material.

1 is a view schematically showing a conventional image forming apparatus.

As shown in FIG. 1, a photosensitive drum 1 rotating at a constant circumferential speed is provided in the housing 2. In order to charge the photosensitive drum 1 to a high voltage, a charging roller 3 is mounted on one surface of the photosensitive drum 1.

In addition, an exposure portion 4 for exposing a constant image to the photosensitive drum 1 charged by the charging roller 3 is formed on one side of the photosensitive drum 1. A developing roller 6 is mounted on one side of the photosensitive drum 1 in order to attach the one-component nonmagnetic toner 5 to the portion where the electrostatic latent image is formed by the exposure part 4 of the photosensitive drum 1. Then, in order to form a constant layer of toner 5 on the surface of the developing roller 6, a metal blade 7 is fixed to the housing 2. One side of the blade 7 is adjacent to the surface of the developing roller 6 at a constant pressure.

One side of the developing roller 6 is provided with a supply roller 8 for supplying the toner 5 to the developing roller 6. As shown in the figure, the feed roller 8 and the stirrer 9 are installed in the toner loading portion 10 in the housing 2. The stirrer 9 serves to agitate the toner 5 to supply the feed roller 8. Then, below the photosensitive drum 1, a transfer roller 12 for transferring an image on the sheet of paper 11 is provided.

However, according to the toner layer regulating apparatus of the conventional image forming apparatus having such a configuration, the blade 7 wears or deforms as the number of uses increases, and the toner 5 adheres to the surface of the developing roller 6. A problem arises. According to this, since the toner layer cannot be regulated constantly, the amount of toner used per area of the developing roller is rapidly increased, and the image quality is lowered. Therefore, conventionally, expensive blades (stainless steel products, etc.) that are not easily worn or deformed have to be used in order to eliminate the problems described above. However, despite the use of such expensive blades, since the blades are made in one piece, the blades may be worn or deformed in the long term, and thus the toner layer may not be constantly regulated. Therefore, a high quality image cannot be obtained, and a loss occurs in terms of cost due to an increase in the amount of toner used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a toner layer regulating apparatus of a developing roller whose structure has been improved so that a high quality image can be obtained by constantly regulating the layer of toner supplied to the developing roller. The purpose is.

The toner layer regulating apparatus of the developing roller according to the present invention for achieving the above object has a predetermined elastic force so as to constantly regulate the amount of toner supplied to the developing roller side and at the same time to regulate the toner layer of the developing roller constantly. It includes two blades provided. That is, the toner layer regulating apparatus of the developing roller according to the present invention is fixed to one side of a certain housing, has a predetermined elastic force, and is adjacent to the surface of the developing roller so as to constantly regulate the toner layer on the surface of the developing roller. 1 blade; And a second blade elastically pressurizing the first blade toward the developing roller side such that the first blade is constantly adjacent to the developing roller side.

Here, the second blade is preferably formed longer than the first blade, it is preferable that the first blade is bent in contact with the second blade.

In addition, according to the present invention, it is further provided with a fixing member which is installed on the inside of the housing to fix the first blade and the second blade, the fixing member is preferably one end is formed in the shape bent with respect to the other end. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, in describing the embodiments of the present invention, the same reference numerals refer to the same parts as those in the related art.

2 is a view for showing a toner layer regulating apparatus of a developing roller according to a preferred embodiment of the present invention.

As shown, the toner layer regulating apparatus of the developing roller according to the preferred embodiment of the present invention includes a housing 2, a fixing member 13, a first blade 14, and a second blade 15. do.

In the housing 2, a supply roller 8 for supplying the toner 5 loaded with the toner 5, a supply roller 8 for supplying the loaded toner 5 installed inside the toner 5, and a supply roller. And a developing roller 6 for transferring the toner 5 supplied by 8 to the photosensitive drum 1 side. Here, an agitator 9 (see FIG. 1) is installed inside the toner loading part 10 to prevent adhesion of the toner 5 and to supply the toner 5 to the supply roller 8 side.

The fixing member 13 is installed on the upper part of the housing 2 to fix the first blade 14 and the second blade 15 which will be described later. In addition, it is preferable that the fixing member 13 has a shape in which one end thereof is bent at a right angle with respect to the other end, and is made of a material having strong adhesive force with the blades 14 and 15 and not easily corroded.

The first blade 14 is fixed to one side of the bent portion of the fixing member 13 in order to constantly regulate the layer of the toner 5 supplied to the developing roller 6. Then, the first blade 14 is adjacent to the surface of the developing roller 6 and has a predetermined elastic force to press the developing roller 6 side. Further, the first blade 14 has a shape in which one end thereof is bent toward the second blade 15, which will be described later, and is made of a material of appropriate strength that is not easily worn by friction, and is used for charging the toner 5. It is desirable that the conductivity is high.

The second blade 15 is formed at the other end of the bent portion of the fixing member 13 in order to regulate the amount so that the toner 5 supplied by the feed roller 8 is constantly moved toward the developing roller 6 side. It is fixed to the side. The second blade 15 is in contact with the bent portion of the first blade 14 to elastically press the first blade 14 toward the developing roller 6. Thereby, even if the 1st blade 14 wears to some extent, it can prevent that the toner 5 layer is not regulated uniformly. In addition, the second blade 15 is preferably made of a material having high conductivity such as rubber or metal, not easily corroded, and having a predetermined elastic force.

Hereinafter, the state in which the toner layer regulating apparatus of the developing roller according to the present invention operates is described in detail with reference to FIG.

As shown, when the toner 5 is supplied to the developing roller 6 side by the supply roller 8, the second blade 15 primarily regulates the amount of the toner 5 constantly. Since the second blade 15 is formed longer than the first blade 14, a predetermined space is secured between the developing roller 6 and the second blade 15. Therefore, since the toner 5 is supplied to the developing roller 6 side by the space thus secured, the amount of the toner 5 supplied compared to the conventional can be constantly regulated. That is, a certain amount of toner moves to the space secured between the second blade 15 and the developing roller 6. The second blade 15 acts to regulate the amount of toner 5 as described above, and simultaneously elastically presses the first blade 14 so that the first blade 14 is constantly adjacent to the developing roller 6 side. The second blade 15 elastically pressurizes the first blade 14 by contacting the bent portion of the first blade 14. According to this, even if the first blade 14 adjacent to the surface of the developing roller 6 is slightly worn down by the continuous rotation of the developing roller 6, the first blade 14 is operated by the above-described operation. It may be constantly adjacent to the surface of (6). Therefore, the toner 5 layer of the developing roller 6 can be constantly regulated.

Then, the toner 5 moved to the space secured between the developing roller 6 and the second blade 15 forms a layer having a predetermined thickness on the surface of the developing roller 6 to develop together with the developing roller 6. The roller 6 flows in the rotational direction. When the layered toner 5 is moved to an adjacent position between the developing roller 6 and the first blade 14, it is regulated by the first blade 14 by a second constant thickness. That is, the toner 5 layer of the developing roller 6 is constantly regulated by the first blade 14 continuously subjected to the elastic pressing action by the second blade 15 as described above.

When the regularly regulated toner 5 layer moves to the photosensitive drum 1 side, a high quality image can be obtained as a result.

According to the toner layer regulating apparatus of the developing roller according to the present invention as described above, the amount of toner supplied to the developing roller by the second blade can be regulated constantly, and the second roller is elastically pressurized to the developing roller side. The toner layer of the developing roller can be constantly regulated by the first blade. Therefore, an image of higher quality than before can be obtained by the toner layer formed on the surface of the developing roller with a uniform thickness.

In addition, since the toner layer is continuously formed on the surface of the developing roller, the amount of toner waste unnecessarily reduced can be considerably reduced, so that the product to which the present invention is applied may be more prominent than other products in terms of cost.

The present invention has been shown and described above in connection with a preferred embodiment for illustrating the principles of the present invention. However, those skilled in the art will recognize that the present invention is not limited to the configuration and operation as shown and described as such, and that many changes and modifications can be made to the present invention without departing from the spirit and scope of the appended claims. I can understand. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (4)

 A toner layer regulating apparatus of a developing roller, which allows a toner supplied by a supply roller to form a layer with a predetermined thickness in a developing roller in a constant housing, A first blade fixed to one side of the housing and having a predetermined elastic force and adjacent to the surface of the developing roller to constantly regulate the toner layer on the surface of the developing roller; And It is formed longer than the first blade so that a predetermined space is formed between the developing roller and regulates the amount of toner supplied to the developing roller, and the first blade is fixedly adjacent to the developing roller side. And a second blade elastically pressurizing the blade toward the developing roller side. delete The method of claim 1, And the first blade is bent at one end thereof to be in contact with the second blade. The method according to claim 1 or 3, And a fixing member installed at an upper portion of the housing to fix the first blade and the second blade, wherein the fixing member has one end bent with respect to the other end. Device.

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