KR100261113B1 - Image formation unit - Google Patents

Abstract

PURPOSE: A video formation device is provided to maintain a definite image quality even though a photosensitive belt is contaminated or damaged by forming an image on a new film, and by transferring the image on recording paper. CONSTITUTION: A secondary roller(22) is installed on one side of a primary roller(21). A tertiary roller(23) is installed on one side of the secondary roller(22). A photosensitive belt(10) is rolled up to the outside of the rollers(21,22,23) and rotated. At least one or more LSUs(30) are installed on one side of the photosensitive belt(10). At least one or more developing devices(40) are installed on one side of the LSU(30). A main electrification device(35) is installed on one side of the photosensitive belt(10) located between the primary roller(21) and the secondary roller(22). A pressure valve(25) is installed on the other side of the primary roller(21). A dry device(50) is installed on one side of the tertiary roller(23). The dry device(50) is equipped with a dry roller(51) and a heat roller(52). A film(65) is attached to one side of the photosensitive belt(10). The first and the second friction roller(62a,62b) are equipped on both sides of the film(65).

Description

Image Forming Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus having an improved structure such that a latent electrostatic image is formed of a toner having a predetermined color on a film attached to one surface of a photosensitive belt by static electricity. It is about.

In general, an image forming apparatus applied to a printer or a copier forms an electrostatic latent image on a photosensitive medium such as a photosensitive drum or a photosensitive belt, develops the electrostatic latent image with a toner having a predetermined color, and transfers the image to a recording sheet to obtain a desired image. Device.

The image forming apparatus is roughly classified into wet and dry according to the toner used. In the wet type, a developer in which a toner is mixed in a liquid carrier of a volatile component is used. The wet image forming apparatus using such a developing solution has better print quality than the dry type using the powder toner, and can prevent damage caused by harmful toner dust, and its use is gradually increasing.

1 is a schematic diagram showing a conventional image forming apparatus.

Referring to FIG. 1, a conventional general image forming apparatus includes a photosensitive belt 10 having an endless track, and primary rollers 21, secondary rollers 22, and 3 for circulating the photosensitive belt 10 in a given path. Three rollers of the secondary roller 23 are provided. In addition, one side of the photosensitive belt 10 is provided with a main charging unit 35 for charging the surface of the photosensitive belt 10 to a uniform potential, and a lower portion of the photosensitive belt 10 according to the image signal (photosensitive belt ( 10) a laser scanning unit (LSU) for irradiating a laser beam to form an electrostatic latent image, and attaching a developer containing a toner having a predetermined color to an area of the photosensitive belt 10 on which the electrostatic latent image is formed A developing device 40 for developing a latent image is provided. In particular, in the case of a color printer, a plurality of developing devices 40 are provided to separately contain a plurality of LSUs 30 and a developer having a plurality of colors for color combinations.

As described above, the developer attached to the electrostatic latent image area of the photosensitive belt 10 includes a liquid carrier which is unnecessary for development, and thus needs to be removed. The removal of the liquid carrier is performed by a drying apparatus 50, and the drying apparatus 50 is a dry roller 51 installed at a predetermined distance from the tertiary roller 23 at a predetermined interval in parallel thereto. And a heat roller (52). The dry roller 51 absorbs the liquid carrier on the surface of the photosensitive belt 10 and dries the developer to form an image of the toner remaining in the electrostatic latent image. The liquid carrier absorbed by the dry roller 51 is heated by the heat roller 52 to be evaporated and removed. Thus, an image remaining only toner is formed in the electrostatic latent image area of the photosensitive belt 10.

The image developed on the photosensitive belt 10 is transferred to the recording paper 26 by the transfer apparatus. The transfer device includes a transfer roller 24 installed in parallel with the primary roller 21 with the photosensitive belt 10 interposed therebetween, and a pressure roller installed in parallel with the transfer roller 24 at a predetermined interval. It consists of 25. The recording paper 26 is supplied between the transfer roller 24 and the pressure roller 25, the transfer roller 24 transfers the image on the photosensitive belt 10 to the recording paper 26, the press The roller 27 heats and pressurizes the image transferred to the recording sheet 26 to fix the recording sheet 28. Therefore, the desired image is finally formed on the recording sheet 26.

Since a conventional image forming apparatus develops an image on a photosensitive belt, if a part of the image developed on the photosensitive belt is transferred to the recording paper and remains, the photosensitive belt is contaminated. In addition, when a part of the photosensitive belt is damaged, the image is unevenly developed on the surface of the damaged photosensitive belt. Therefore, there is a problem that the image quality formed on the recording paper becomes poor.

The present invention has been made to solve the above problems of the prior art, and an object thereof is to provide an image forming apparatus capable of obtaining a high quality image on a recording sheet regardless of the state of the photosensitive belt.

1 is a schematic diagram showing a conventional image forming apparatus.

2 is a schematic diagram showing an image forming apparatus according to the present invention;

<Explanation of symbols for the main parts of the drawings>

10 ... Photosensitive belt 21 ... 1st roller

22 ... 2nd roller 23 ... 3rd roller

25.Pressure roller 26.Recording paper

30 ... LSU 35 ... Main Electric

40 Developing unit 50 Drying unit

51 ... Dry Roller 52 ... Hit Roller

60a ... film supply container 60b ... film recovery container

62a ... first friction roller 62b ... second friction roller

65.Film 67.Electrostatic Eliminator

The image forming apparatus according to the present invention for achieving the above object, the primary roller 21, the secondary roller 22 provided on one side of the primary roller 21, and the secondary roller 22 Tertiary roller (23) installed on one side of the), the photosensitive belt (10) wound around the outside of the 1,2, tertiary rollers (21, 22, 23), and one side of the photosensitive belt (10) At least one or more LSUs 30 installed on the photosensitive belt 10 to form an electrostatic latent image, and at least one or more LSUs 30 installed on one side of the LSU 30 to develop an electrostatic latent image formed on the photosensitive belt 10. A developing device 40, a main battery 35 for uniformly charging the surface of the photosensitive belt 10, a pressure roller 25 installed on the other side of the primary roller 21 to press the recording paper, An image forming apparatus having a drying unit 150 installed at one side of the tertiary roller 23 to dry a liquid carrier, the film 65 having an image formed thereon, and First and second friction rollers for generating static electricity in the film supply container 160a for supplying the diameter 65 to one side of the photosensitive belt 10 and the film 65 from the film supply container 160a ( 62a and 62b, and through an electrostatic removing unit 67 for removing static electricity of the film 65, which has emerged between the primary roller 21 and the secondary roller 25, and the electrostatic removing unit 67. And a film recovery container 160b for recovering one film 65.

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

2 is a schematic view showing an image forming apparatus according to the present invention.

2, in the image forming apparatus according to the present invention, a primary roller 21 and a secondary roller 22 are installed at one side of the primary roller 21, and the secondary roller 22 is disposed. A tertiary roller 23 is installed on one side, and the photosensitive belt 10 is wound around the outside of the 1,2,3 tertiary rollers 21, 22, 23 to rotate. At least one LSU 30 is formed at one side of the photosensitive belt 10 to form an electrostatic latent image on the photosensitive belt 10. At least one developing device 40 for developing an electrostatic latent image formed on the photosensitive belt 10 is installed at one side of the LSU 30. On one side of the photosensitive belt 10 positioned between the primary roller 21 and the secondary roller 22, a main charging unit 35 for uniformly charging the surface of the photosensitive belt 10 is installed. The recording paper 26 passes through one surface of the photosensitive belt 10 in contact with the outer surface of the primary roller 21. A pressure valve 25 is provided on the other side of the primary roller 26 with the recording paper 26 therebetween. On one side of the tertiary roller 23, a drying device 50 for drying the liquid carrier is installed. The drying apparatus 50 includes a dry roller 51 and a heat roller 52 for vaporizing a liquid carrier (not shown) adhered to the dry roller 51 at one end of the dry roller 51 with high heat. Equipped. A film 65 attached to one side of the photosensitive belt 10 and first and second friction rollers 162a and 162b for generating static electricity by friction on both sides of the film 65 are further provided. When the film 65 passes between the first and second friction rollers 62a and 62b, the first friction roller 62a rotates in the opposite direction of travel of the film 65 and the second friction roller ( 62b) rotates in the advancing direction of the film 65. The first friction roller 162a is preferably made of a nonwoven material.

The film supply container 160a for supplying the film 65 is installed at one side of the first and second friction rollers 162a and 162b, and the film 65 is collected at the other side of the pressure roller 25. The film recovery container 160b is installed. And, on one side of the film 65 located between the primary roller 21 and the secondary roller 22, an electrostatic removing unit 67 for removing the static electricity of the film 65 is provided. The static elimination unit 67 is preferably in the form of a brush for removing static electricity.

An operation of the image forming apparatus according to the present invention having such a structure will be described below with reference to FIG. 2.

The photosensitive belt 10 charged by the main battery 35 to a uniform electric potential passes through the secondary roller 22. On the other hand, the film 65 supplied from the film supply container 60a is in close proximity to the photosensitive belt 10 while rubbing against the first friction roller 62a which is rotated in the direction opposite to the progress of the film to exhibit a predetermined static electricity. . At this time, the photosensitive belt 10 charged at a uniform electric potential and the film 65 subjected to predetermined static electricity are in contact with each other by the static electricity of the film 65. According to the transmitted image signal, the LSU 30 irradiates a laser beam (not shown) to the photosensitive belt 65 to which the film 65 is attached. The laser beam (not shown) passes through the film 65 to form an electrostatic latent image on the photosensitive belt 10. The developing device 40 attaches a developer (not shown) containing toner having a predetermined color to the surface of the film 65 attached to the photosensitive belt 65 on which the electrostatic latent image is formed. While the film 65 passes through the drying unit 50, the liquid carrier (not shown) attached to the film 65 is evaporated and removed. Therefore, an image remaining only toner is formed on the film 65.

The image developed on the film 65 is transferred to the recording paper 26 transferred between the primary roller 21 and the pressure roller 25. In the film 65 in which the developed image is transferred onto the recording paper 26, the static electricity is removed by the static electricity removing unit 67. Accordingly, the film from which the static electricity is removed is separated from the photosensitive belt 10 and collected in the film collection container 160b.

As described above, the image forming apparatus according to the present invention forms an image on a new film that is continuously supplied and transfers it to recording paper, so that the image quality can be maintained even if the photosensitive belt is somewhat contaminated or partially damaged.

Claims (4)

The primary roller 21, the secondary roller 22 provided on one side of the primary roller 21, the tertiary roller 23 provided on one side of the secondary roller 22, and the 1,2 At least one of the photosensitive belt 10 is wound around the outside of the third roller (21, 22, 23) and rotated, and is provided on one side of the photosensitive belt (10) to form an electrostatic latent image on the photosensitive belt (10) The LSU 30, at least one developing device 40 installed on one side of the LSU 30, and developing the electrostatic latent image formed on the photosensitive belt 10, and the surface of the photosensitive belt 10 are uniform. The main charging unit 35 to be electrically charged, the pressure roller 25 installed on the other side of the primary roller 21 to press the recording paper, and one side of the tertiary roller 23 to dry the liquid carrier. In the image forming apparatus having a drying unit 150, On the film 65 in which the image is formed, the film supply container 160a for supplying the film 65 to one side of the photosensitive belt 10, and the film 65 from the film supply container 160a. First and second friction rollers 62a and 62b for generating static electricity, and an electrostatic removing unit 67 for removing static electricity from the film 65 between the first and second rollers 21 and 25. And a film recovery container (160b) for recovering the film (65) that has passed through the static elimination section (67). The method of claim 1, wherein when the film (65) passes between the first and second friction rollers (62a, 62b), the first friction roller (62a) rotates in the opposite direction of travel of the film (65) And the second friction roller (62b) rotates in the advancing direction of the film (65). The image forming apparatus according to claim 1, wherein the first friction roller (162a) is made of a nonwoven fabric. The image forming apparatus of claim 1, wherein the static electricity removing unit is a brush.

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