KR19980077407A - Transfer roller cleaning device for electrophotographic processor - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to an image forming apparatus of an electrophotographic processor.

I. The technical problem that the invention is trying to solve.

The present invention provides a transfer roller cleaning apparatus of an electrophotographic processor capable of removing fine stakes, residual toner, foreign matter, and the like attached to a transfer roller.

All. Summary of the Solution of the Invention.

A photosensitive drum rotating clockwise at a constant circumferential speed, a charging roller for uniformly charging the electric charge layer on the surface of the photosensitive drum, an exposure portion for forming an electrostatic latent image on the surface of the electrically charged photosensitive drum, A developing roller for developing the toner on the electrostatic latent image formed on the photosensitive drum surface, a transfer roller for transferring the toner image on the photosensitive drum surface onto a recording paper, and a conductive brush provided on the lower side of the transfer roller. It is done.

la. Important use of the invention.

The invention transfer roller cleaning apparatus for use in an electrophotographic processor.

Description

Transfer roller cleaning device for electrophotographic processor

The present invention relates to an image forming apparatus of an electrophotographic processor, such as a laser beam printer, a copying machine, a plain paper facsimile, and the like. A transfer roller cleaning apparatus for an electrophotographic processor capable of forming an image.

1 is a schematic view showing the configuration of an image forming apparatus of an electrophotographic processor, as shown in FIG. One side of the upper end of the photosensitive drum 50 is provided with a charging roller 52 for uniformly charging the electric charge layer on the surface of the photosensitive drum 50. Thereafter, the other end of the upper end of the photosensitive drum 50 is provided with an exposed portion 54 for forming an electrostatic latent image on the surface of the photosensitive drum 50 which is electrically charged. In addition, one side of the photosensitive drum 50 is provided with a developing roller 58 for developing the toner 62 on the electrostatic latent image formed on the surface of the photosensitive drum 50, and one side of the developing roller 58 is stirred by an agitator. A supply roller 60 for transferring the used toner 62 to the developing roller 58 side is provided. Then, at the upper end of the developing roller 58, a doctor blade 56 for regulating the toner 62 formed on the surface of the developing roller 58 to a uniform height is installed on one side of the developer housing. Thereafter, the lower end of the electrophotographic processor has a cassette 66 for mounting the recording paper 68, and a paper feed roller 70 for supplying the recording paper 68 mounted on the cassette 66 to the transfer roller 64 side. ) Is installed. At the lower end of the photosensitive drum 50, a transfer roller 64 for transferring an image of the toner 62 on the surface of the photosensitive drum 50 onto the recording paper 68 is provided. In addition, the other side of the photosensitive drum 50 is provided with a cleaner 78 for removing the toner 62 remaining on the surface of the photosensitive drum 50 in the state that the transfer process is completed, one side of the cleaner 78 is A fixing unit composed of a heating roller 74 and a compression roller 72 for fixing and compressing the toner 62 image on the transferred recording paper 68 is provided. The cleaner 78 is equipped with a cleaning roller or a cleaning blade.

The printing process of the image forming apparatus of the electrophotographic processor configured as described above is as follows.

The surface of the photosensitive drum 50 is electrically uniformly charged by the corona discharge of the charging roller 52, and the portion charged by the rotation of the photosensitive drum 50 forms an image through the exposure part 54. When the surface of the photosensitive drum 50 is exposed by receiving an electrical signal, an electrostatic latent image is formed in a portion that receives light in an initial charged state. At this time, when the toner 62 is not used, the toner 62 is agitated to have a constant charge by a stirrer, and is moved to the developing roller 58 by the supply roller 60. Thereafter, a toner 62 layer is formed on the surface of the developing roller 58, and the toner 62 layer is formed on the surface of the developing roller 58 at a uniform height under the regulation of the doctor blade 56. . Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 50 is developed into a toner 62 while passing through the developing roller 58 to become a visible image, and then the recording paper 68 mounted on the cassette 66 is fed. It is fed by the roller 70. Thereafter, the toner 64 image on the surface of the photosensitive drum 50 is transferred to the surface of the recording paper 68 by the high pressure action of the transfer roller 64. At this time, the fine portion of the recording paper 68 itself, the scattered toner 62, the foreign matter, and the like fall on the surface of the transfer roller 64. Thereafter, the recording paper 68 passes between the heating roller 74 and the compression roller 72 of the fixing unit, and an image is fixed to the surface of the recording paper 68 by heat and pressure, and is transferred to the pedestal 76 side. The desired printing is achieved. On the other hand, the toner 62 remaining on the surface of the photosensitive drum 50 after passing the transfer roller 64 is removed by the cleaner 78.

As described above, the shares, scattered toner, foreign matters, etc., which fell on the surface of the transfer roller after the transfer process do not fall under the transfer roller, but the electrophotographic processor warms up or after the recording paper passes. Since the transfer roller is in contact with the photosensitive drum, the minute share of the transfer roller and the toner scattered with the foreign matter adhere to the photosensitive drum surface, resulting in a small dot shape in the image at the next printer. In addition, the stake, foreign matter, scattered toner and the like are transferred to the developing roller and the charging roller which are in contact with the photosensitive drum, which causes a problem in that a high resolution image cannot be formed.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a transfer roller cleaning apparatus of an electrophotographic processor capable of removing fine stakes, residual toner, and foreign matter attached to a transfer roller.

Another object of the present invention is to provide an apparatus capable of forming a high resolution image.

It is still another object of the present invention to provide a device capable of removing a stake, scattered toner, foreign matter, etc. attached to the surface of a transfer roller by applying a voltage to a brush, which is a cleaning device.

In order to achieve the above object, the present invention provides a photosensitive drum which rotates in a clockwise direction at a constant circumferential speed, a charging roller for uniformly charging the electric charge layer on the photosensitive drum surface, and an electrically charged photosensitive drum surface. An electrostatic latent image is formed by: an exposure unit, a developing roller for developing toner on an electrostatic latent image formed on the surface of the photosensitive drum, a transfer roller for transferring a toner image on the surface of the photosensitive drum onto a recording paper, and a lower portion of the transfer roller. The side is characterized in that the conductive brush (brush) for removing the stake, foreign matter, scattered toner and the like attached to the surface of the transfer roller is installed.

1 is a schematic diagram showing the configuration of an electrophotographic processor according to an embodiment of the prior art;

Figure 2 is a schematic diagram showing the configuration of an electrophotographic processor equipped with a brush in the transfer roller according to an embodiment of the present invention.

3 is a waveform diagram showing the voltage relationship between the transfer roller and the brush according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: photosensitive drum 12: charging roller

14: exposure unit 16: doctor blade

18: developing roller 20: feeding roller

22: toner 24: transfer roller

26: Brush 28: Cassette

30: recording paper 32: paper feed roller

34: compression roller 36: heating roller

38: pedestal

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

In the transfer roller cleaning apparatus of the electrophotographic processor according to the present invention, as shown in FIGS. 2 and 3, a photosensitive drum 10 rotating clockwise at a constant circumferential speed is installed. One side of the upper end of the photosensitive drum 10 is provided with a charging roller 12 for uniformly charging the electric charge layer on the surface of the photosensitive drum 10. The other end of the upper end of the photosensitive drum 10 is provided with an exposure portion 14 for forming an electrostatic latent image on the surface of the photosensitive drum 10 electrically charged. Thereafter, one side of the photosensitive drum 10 is provided with a developing roller 18 for developing the toner 22 on the electrostatic latent image formed on the surface of the photosensitive drum 10. One side of the developing roller 18 is provided with a feed roller 20 for transferring the toner 22, which is stirred by the stirrer, to the developing roller 18 side. Then, at the upper end of the developing roller 18, a doctor blade 16 for regulating the toner 22 formed on the surface of the developing roller 18 to a uniform height is provided on one side of the developing housing. In addition, the lower end of the electrophotographic processor, the cassette 28 for mounting the recording paper 30, and the paper feed roller 32 for supplying the recording paper 30 mounted on the cassette 28 to the transfer roller 24 side. ) Is installed. At the lower end of the photosensitive drum 10, a transfer roller 24 for transferring an image of the toner 22 on the surface of the photosensitive drum 10 onto the recording paper 30 is provided. Thereafter, a lower surface of the transfer roller 24 is provided in contact with a conductive brush 26 for removing a stake, foreign matter, and scattered toner 22 attached to the surface of the transfer roller 24. At this time, the stake, foreign matter, scattered toner 22, etc. attached to the surface of the transfer roller 24 are removed while being wiped by a brush 26 when the transfer roller 24 is rotated. The conductive brush 26 is provided with a power supply device 26a to apply power to an appropriate process section to push the residual toner 22 on the transfer roller 24 to the photosensitive drum 10. Lastly, one side of the photosensitive drum 10 is provided with a fixing roller 36 and a fixing roller 34 configured to fix and compress the toner 22 image on the transferred recording paper 30.

Referring to the operation and effects of the present invention configured as described above are as follows.

First, the surface of the photosensitive drum 10 is electrically uniformly charged by the corona discharge of the charging roller 12. Then, the portion charged by the rotation of the photosensitive drum 10 receives an electrical signal for forming an image through the exposure unit 14 and exposes the surface of the photosensitive drum 10 to receive the light in the initial charged state. The electrostatic latent image is formed. Thereafter, the toner 22 is moved to the developing roller 18 side by the supply roller 20. Thereafter, a layer of toner 22 is formed on the surface of the developing roller 18, wherein the layer of toner 22 is formed on the surface of the developing roller 18 at a uniform height by the regulation of the doctor blade 16. . Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 10 is developed with the toner 22 while passing through the developing roller 18 to become a visible image. Thereafter, the recording paper 30 mounted on the cassette 28 is fed by the paper feed roller 32, and then the surface of the photosensitive drum 10 is subjected to the high pressure of the transfer roller 24 on the surface of the recording paper 30. The toner 22 image is transferred. At this time, the fine portion of the recording paper 30 itself, the scattered toner 22, the foreign matter, and the like are attached to the surface of the transfer roller 24. Since the transfer roller 24 and the conductive brush 26 are in contact with each other, the surface of the transfer roller 24 is physically wiped by a brush 26 when the transfer roller 24 is rotated. The foreign matter, the scattered toner 22, the equity, and the like are removed.

In addition, the process of electrically removing the residual toner 22 by applying power to the conductive brush 26 will be described below. First, the T1 section is a cleaning section for applying the negative polarity to the transfer roller 24 to push the residual toner 22 having the negative polarity onto the photosensitive drum. The T2 section is a section in which the image toner 22 on the photosensitive drum 10 is transferred onto the paper 30 by applying a positive polarity normally. T3 is a section that serves to send the residual toner 22 having the (+) polarity on the transfer roller 24 onto the photosensitive drum 10. T4 is a section according to the present invention, in which the residual toner 22 on the transfer roller 24 having a positive polarity is charged to the brush 26 with a negative polarity by the power supply device 26a to the T1 section. Help your role in Thereafter, the recording paper 30 passes between the heating roller 36 and the compression roller 34 of the fixing unit, and an image is fixed to the surface of the recording paper 30 by heat and pressure, and is transferred to the pedestal 38 side. The desired printing is achieved.

As described above, the transfer roller cleaning apparatus of the electrophotographic processor according to the present invention physically wipes fine stakes and residual toner and foreign matters attached to the transfer roller by a conductive brush installed on the lower side of the transfer roller, Since the device is electrically pushed into the photosensitive drum, the device can form a high-resolution image, can extend the life of the product, and the user can improve the reliability of the product.

Claims (4)

A photosensitive drum rotating clockwise at a constant circumferential speed, a charging roller for uniformly charging the electric charge layer on the surface of the photosensitive drum, an exposure portion for forming an electrostatic latent image on the surface of the electrically charged photosensitive drum; An image forming apparatus of an electrophotographic processor comprising: a developing roller for developing a toner on an electrostatic latent image formed on the surface of the photosensitive drum; and a transfer roller for transferring a toner image on the surface of the photosensitive drum onto a recording sheet; The transfer roller cleaning apparatus of the electrophotographic processor, characterized in that the lower side of the transfer roller is provided with a conductive brush for removing the stake, foreign matter, scattered toner attached to the surface of the transfer roller. The transfer roller cleaning apparatus of claim 1, wherein the stake, foreign matter and scattered toner attached to the surface of the transfer roller are physically removed by the conductive brush when the transfer roller rotates. The transfer roller cleaning of the electrophotographic processor according to claim 1, wherein the stake, foreign matter and scattered toner attached to the surface of the transfer roller are electrically removed by applying power to the conductive brush when the transfer roller is rotated. Device. The transfer roller cleaning apparatus of claim 1, wherein the conductive brush is formed of a material capable of receiving power.