KR20010038932A - Apparatus for cleaning transfer roller in liquid electrophotographic printer - Google Patents

Abstract

PURPOSE: A transfer roller cleaning device for an electro-photographic is provide to effectively clean an alien material of transfer roller by inhibiting a clearance that formed between trans roller and cleaning roller. CONSTITUTION: A cleaning roller(140) comprises a rotating shaft(141) consisting of a metal and a rubber(142) wrapping the periphery of rotating shaft(141). The rubber is elastically deformed by adhering cleaning roller(140) closely to the transfer roller(120). A heater(122) is positioned into the inside of the transfer roller(120) in order to stand heat. To remove an alien material from the transfer roller(120), the rubber(120) is higher than the transfer roller(120). The rubber(120) consisted of a silicon and a fluorine. The toner image(320) is carried at the transfer roller of photosensitized medium(100). The rotating shaft(141) is supported by a supporting part(151). A cam part(153) pushes to the supporting part(151) toward the anti direction of transfer roller(151).

Description

Apparatus for cleaning transfer roller in liquid electrophotographic printer

The present invention relates to an apparatus for cleaning a transfer roller for transferring an image from a photosensitive medium of a wet electrophotographic printing machine to printing paper, and more particularly, a transfer roller cleaning apparatus for a wet electrophotographic printing machine having an improved structure of the cleaning roller. It is about.

Referring to FIG. 1, a general wet electrophotographic printing machine forms an image by attaching a developer mixed with a liquid carrier, which serves as a solvent, to a electrostatic latent image region formed on a photosensitive medium such as a photosensitive belt by a developer. And printing the formed image on printing paper through a transfer roller.

The transfer roller cleaning device of the wet electrophotographic printing machine is a cleaning roller installed to be rotated in close contact with the transfer roller 20 which transfers an image onto the printing paper 50 from the photosensitive medium 10 which is supported by the guide roller 11 and runs. And 40.

In the process of transferring the image to the printing paper 50 by the transfer roller 20 in a state in which a small amount of toner particles 61 remain in the transfer roller 20 without being completely transferred to the printing paper 50. You will be transferred to the next transcription process. As such, in order to remove the foreign matter 62 remaining in the transfer roller 20, a cleaning roller 40 made of metal is conventionally used.

The cleaning roller 40 contacts the transfer roller 20 and cleans the transfer roller 20 by receiving and stacking the foreign matter 62 remaining on the transfer roller 20 due to the surface energy difference. As such, when the cleaning roller is used for a long time, as the foreign matter is continuously laminated on the outer circumferential surface thereof, the outer circumferential surface thereof becomes rough and the surface is not uniform.

However, in the metal cleaning roller, as shown in FIG. 2, a gap occurs in a portion where the transfer roller and the cleaning roller come into contact with each other by the stacked foreign matter. Accordingly, in the parts not in contact with each other, foreign matter remaining in the transfer roller is not transferred to the cleaning roller and is transferred to the next transfer process, thereby degrading the quality of the print image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by suppressing a gap that may occur in a portion where the transfer roller and the cleaning roller come into contact with each other, a wet electrophotographic printing machine capable of effectively cleaning foreign matter remaining in the transfer roller Its purpose is to provide a transfer roller cleaning device.

1 is a schematic configuration diagram showing a main configuration of a transfer roller cleaning apparatus of a conventional wet electrophotographic printer;

FIG. 2 is a view illustrating an essential part of the transfer roller cleaning device of FIG. 1; FIG.

3 is a view showing a transfer roller cleaning device according to an embodiment of the present invention.

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

100 ... Photosensitive medium 110 ... Guide roller

120 ... Transfer roller 122,132 ... Heater

130 ... fixed roller 140 ... cleaning roller

141 ... rotary shaft 142 ... rubber member

151 Support member 152 Spring member

153 Cam member 200 ... Printable paper

The present invention for achieving the above object is in contact with the transfer roller for transferring the image from the photosensitive medium to the printing paper, the transfer roller cleaning apparatus of a wet electrophotographic printing machine for cleaning the transfer roller, the adhesion to the transfer roller A cleaning roller having a rotating shaft rotatably installed and a rubber member surrounding the outer circumferential surface of the rotating shaft; And a movable means for moving the cleaning roller so that the cleaning roller is in close contact with and spaced apart from the transfer roller, thereby preventing a gap from occurring in a portion where the transfer roller and the cleaning roller come into contact with each other.

Hereinafter, a cleaning apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 3, the transfer roller cleaning apparatus of the wet electrophotographic printing machine according to the present invention includes a transfer roller 120 which receives a toner image formed on the photosensitive medium 100 and transfers the image onto the printing paper 200. It includes a cleaning roller 140 for cleaning, and a moving means for bringing the cleaning roller 140 in close contact with or in the direction of the transfer roller 120.

Here, reference numerals 122 and 132 of the drawings are heaters for heating the transfer roller 120 and the fixing roller 130, respectively.

The cleaning roller 140 includes a rotating shaft 141 made of metal and a rubber member 142 formed to surround the outer circumference of the rotating shaft 141. The rubber member 142 may be elastically deformed so that the cleaning roller 140 is pressed by the transfer roller 120 while being in close contact with the transfer roller 120.

Here, the rubber member 142 should not be dissolved in a liquid carrier made of a volatile material included in the toner image 320 transferred to the transfer roller 120, for example, a norpar, and the transfer roller 120 It must be able to withstand the heat conducted by the heater 122 located therein. And, in order to remove the foreign matter from the transfer roller 120, the surface energy should be higher than the transfer roller 120. Therefore, the rubber member 142 is preferably composed of silicon (silicon), nitrile butadiyn (nittril butadiyn), or fluorine rubber, which is excellent in volatility and heat resistance and higher in surface energy than the transfer roller 120.

In the cleaning roller 140, the toner image 310 formed on the photosensitive medium 100 is transferred to the transfer roller 120, is printed on the printing paper 200 while being rotated about half, and then, before being rotated once (in the drawing). It is installed to be in close contact with the outer circumferential surface of the left) of the transfer roller.

The movable means includes a support member 151, a cam member 153, and a spring member 152. The support member 151 supports the rotating shaft 141 so that the cleaning roller 140 is rotatable, and the cam member 153 supports the cleaning roller 140 to selectively contact the transfer roller 120. Push 151 to face in the opposite direction of the transfer roller 120, the spring member 152 is installed to push the support member 151 in the direction of the transfer roller 120.

In the transfer roller cleaning apparatus according to the present invention having the above-described configuration, the cleaning roller 140 is in contact with the transfer roller 120 to receive and deposit the foreign matter 340 remaining on the surface of the transfer roller 120. The transfer roller 120 is cleaned.

Here, even if the foreign matter 340 is continuously stacked on the cleaning roller 140, the outer circumferential surface of the cleaning roller 140 is a rubber member 142, the movable means for pushing in the direction of the transfer roller 120 is installed Since the rubber member 142 is in close contact with the transfer roller 120, it is elastically pressed. Then, the area in which the transfer roller 120 and the cleaning roller 140 are in contact with each other can be maintained in a wide state, so that a gap between the transfer roller 120 and the cleaning roller 140 due to the foreign matter 340 can be suppressed. It becomes possible.

According to the transfer roller cleaning apparatus of the wet electrophotographic printing machine according to the present invention as described above, the outer circumferential surface of the cleaning roller is a rubber member and is provided with movable means for pushing the cleaning roller in the direction of the transfer roller. The occurrence of a gap in the contact portion of the roller is suppressed to increase the cleaning efficiency of toner particles and foreign matter remaining in the transfer roller.

Claims (3)

A transfer roller cleaning apparatus of a wet electrophotographic printer for contacting a transfer roller for transferring an image from a photosensitive medium to a printing paper and cleaning the transfer roller, A cleaning roller having a rotational shaft rotatably mounted to the transfer roller and a rubber member surrounding the outer circumferential surface of the rotational shaft; Wetting means for moving the cleaning roller so that the cleaning roller is in close contact with and spaced apart from the transfer roller, the wet electrophotographic method characterized in that to prevent the occurrence of a gap in the contact portion between the transfer roller and the cleaning roller. Transfer roller cleaning device for printing machine. The method of claim 1, wherein the rubber member A transfer roller cleaning apparatus for a wet electrophotographic printing press, characterized in that it is made of any one material selected from the group consisting of silicon, nitrile butadiyn, and fluorine rubber. The method of claim 1 or 2, wherein the movable means A support member for supporting the rotating shaft; A cam member contacting the support member to space the cleaning roller in a direction opposite to the transfer roller; A spring member coupled to the support member to elastically bias the cleaning roller in the direction of the transfer roller; Transfer roller cleaning apparatus of the wet electrophotographic printing machine characterized in that it comprises a.