KR200166532Y1 - Apparatus for cleaning electrical charging roller - Google Patents

Abstract

The present invention relates to a cleaning apparatus for a charging roller, the shock absorbing member is coupled to the inner surface of the developer frame in the width direction, the shock absorbing member is attached to the brush in contact with the surface of the charging roller.

According to the present invention configured as described above, as the photosensitive drum and the charging roller are rotated in contact with each other, a source of contamination such as residual toner buried on the surface of the photosensitive drum is moved to the surface of the charging roller. It accumulates on the brush away from the charging roller. If the pollutant continues to be loaded, the cushioning member contracts and the frictional pressure between the brush and the charging roller is reduced. That is, the frictional pressure of the brush and the charging roller can maintain the set value.

As a result, the frictional pressure between the charging roller and the brush is maintained so that the surface of the charging roller is not damaged, so that a clear image can be obtained.

Description

Cleaning device for charging roller {APPARATUS FOR CLEANING ELECTRICAL CHARGING ROLLER}

The present invention relates to a cleaning apparatus for a charging roller, and more particularly, to a cleaning apparatus for a charging roller that can prevent the damage of the charging roller by maintaining the friction pressure with the charging roller.

In general, an image forming apparatus employing an electrophotographic developing method, as shown in Fig. 1, has a charging roller 1, a photosensitive drum 2, and a transfer roller 3 for printing predetermined image data on a printing sheet. , A developing roller 4, a supply roller 5, a fixing unit 6, an exposure apparatus 7, and the like. That is, if the photosensitive member formed on the outer circumferential surface of the photosensitive drum 2 is evenly charged while the charging roller 1 rotated by the high-voltage charging voltage, the photosensitive drum 2 with charged light generated by the exposure apparatus 7 is charged. An electrostatic latent image to be printed is formed on the surface. The latent electrostatic image here has a potential of about -60V.

Thereafter, a potential difference is generated between the supply roller 5 to which the high pressure supply voltage is applied and the developing roller 4 to which the voltage of the level lower than the supply roller 5 is applied. As a result, the supply roller 5 and the development roller are developed. An electric force line is formed in the roller 4, and the toner of the negative charge component is transferred from the supply roller 5 to the developing roller 4 by the electric force line, and the toner supplied to the developing roller 4 thus forms the surface of the photosensitive drum 2. It is applied to the electrostatic latent image formed in the.

The high pressure transfer roller 3 transfers the toner applied to the electrostatic latent image (ie, the image portion) of the photosensitive drum 2 onto the printing paper. The toner transferred to the printing paper is fixed to the printing paper by the high heat and pressure of the fixing unit 6, thereby completing the printing process.

On the other hand, the charging roller 1 is engaged with the photosensitive drum 2 and rotated so that contamination sources such as toner on the surface of the photosensitive drum 2 and the share of the printing paper, etc. are buried on the surface of the charging roller 1, and, if so, An image deterioration phenomenon such as black dots or vertical lines being printed is generated, and a cleaning apparatus for preventing the above is provided.

As an example of the cleaning apparatus, as shown in FIG. 2, a cleaning film 8 is installed in a developer frame (not shown), and an end portion of the cleaning film 8 is in contact with the surface of the charging roller 1 while the charging roller 1 Rotating) will scrape away the contaminants on the surface.

As another example of the cleaning apparatus, as shown in FIG. 3, the brush 10 is attached to the film 9 so that the brush 10 removes the contamination source on the surface of the charging roller 1.

However, according to the charging roller cleaning apparatus according to the prior art, since the cleaning apparatus such as the film 8 or the brush 10 has no elastic force, when a pollution source such as toner is accumulated between the charging roller 1, the charging roller 10 The pressing force on) becomes large. In this case, the surface of the charging roller 1 which rotates at high speed is abraded by the film 8 and the brush 10, and the above-mentioned image quality deterioration phenomenon arises.

In addition, in the center feeding method, toner is concentrated in the center portion of the cleaning device (film 8 or brush 10) and the charging roller 10. At this time, the left and right sides of the cleaning device and the charging roller 1 It was lifted up and it was not able to wipe the charging roller 1 effectively.

The present invention has been devised to solve the problems described above, so that the pressing force with the charging roller is changed elastically according to the condition, so that even if a pollution source such as toner is accumulated between the charging roller, the frictional force with the charging roller is one. SUMMARY OF THE INVENTION An object of the present invention is to provide a charging roller cleaning device capable of preventing the damage of the charging roller by keeping it stationary.

1 is a schematic diagram of a general image forming apparatus.

2 is a block diagram showing an example of a charging roller cleaning device according to the prior art.

3 is a schematic view showing another example of a charging roller cleaning device according to the prior art.

Figure 4 is a perspective view showing the configuration of an embodiment according to the present invention.

5 is a side view of a developing unit showing an installation state of the embodiment according to the present invention.

<Description of the code used in the main part of the drawing>

1: charging roller 2: photosensitive drum

20: developer frame 30: buffer member

40: brush

The cleaning device of the present invention charging roller for achieving the above object, the buffer member is attached to the inner surface of the developer frame in the width direction, and attached to the buffer member and is in contact with the surface of the charging roller and adhered to the surface of the charging roller Characterized in that it comprises a brush for removing the source of contamination.

The buffer member is preferably a urethane foam material.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 4 is a perspective view for showing the installation state of the embodiment according to the present invention, Figure 5 is a side view showing the installation state of the embodiment according to the present invention. For convenience of description, the same member numbers are assigned to the same constituent members as in the prior art.

As shown therein, the cleaning device of the subject innovation charging roller includes a buffer member 30 made of urethane foam material coupled to the inner surface of the developer frame 20 in the width direction of the charging roller 1, and the shock absorbing member 30. It is attached to one surface of the width direction and consists of a brush 40, the end of which is in contact with the surface of the charging roller (1).

Referring to the working state of the embodiment according to the present invention configured as described above are as follows.

First, the image forming operation will be briefly described. When the charging roller 1 charged by the high-voltage charging voltage is rotated and the photosensitive member formed on the outer circumferential surface of the photosensitive drum 2 is evenly charged, it is generated in the exposure apparatus 7. An electrostatic latent image to be printed is formed on the surface of the photosensitive drum 2 on which light is charged.

Thereafter, a potential difference is generated between the supply roller 5 to which the high pressure supply voltage is applied and the developing roller 4 to which the voltage of the level lower than the supply roller 5 is applied. As a result, the supply roller 5 and the development roller are developed. An electric force line is formed in the roller 4, and the toner of the negative charge component is transferred from the supply roller 5 to the developing roller 4 by the electric force line, and the toner supplied to the developing roller 4 thus forms the surface of the photosensitive drum 2. It is applied to the electrostatic latent image formed in the.

The high pressure transfer roller 3 transfers the toner applied to the electrostatic latent image (ie, the image portion) of the photosensitive drum 2 onto the printing paper. The toner transferred to the printing paper is fixed to the printing paper by the high heat and pressure of the fixing unit 6, thereby completing the printing process.

When such a developing action is performed, the charging roller 1 and the photosensitive drum 2 are engaged and rotated so that contaminations such as equity, toner, etc. deposited on the surface of the photosensitive drum 2 move to the surface of the charging roller 1, and the charging roller 1 ) Rotates with the contamination.

The pollutant source on the surface of the charge roller 1 while the charge roller 1 is rotated is removed by the brush 40, that is, the rotation of the contamination source on the surface of the charge roller 1 on which the fixed brush 40 is rotated. The surface portion of the charging roller 1 in contact with the photosensitive drum 2 is kept clean. At this time, the pollutant is accumulated between the brush 40 and the charging roller 1.

When the pollution source is loaded in this way, the shock absorbing member 30 is elastically contracted so that the pressing force of the brush 40 against the charging roller 1 becomes small.

Therefore, when a pollution source such as toner accumulates between the charging roller 1 and the brush 40, the buffer member 30 is contracted so that the friction pressure between the brush and the charging roller does not increase as in the prior art.

As described above, according to the cleaning device of the present invention charging roller, the frictional pressure between the brush and the charging roller is maintained by the buffer member to prevent the damage of the charging roller, thereby maintaining a clean and clear image. There is a significant effect.

Claims (2)

And a brush attached to the inner surface of the developing frame in the width direction, and a brush attached to the buffer member and contacting the surface of the charging roller to remove contaminants on the surface of the charging roller. Cleaning device. The cleaning device of claim 1, wherein the buffer member is made of urethane foam.