KR100255656B1 - Carrier squeezing device for wet type electrophotographic printer - Google Patents

Abstract

PURPOSE: A carrier squeezing apparatus for a wet electrophotographic printer is provided to prevent toner particles from being separated from a photosensitive belt and to efficiently remove the residual developing solution attached to a squeeze roller. CONSTITUTION: A carrier squeezing apparatus for a wet electrophotographic printer includes a squeeze roller installed in a main body of the printer to be rotated while making contact with a photosensitive belt(11) to remove a liquid carrier(c) attached to the surface of the liquid carrier, and a blade in contact with the outer peripheral surface of the squeeze roller for removing carrier and toner(T) attached to the surface, wherein the squeeze roller includes a shaft(72) forming both ends rotatably held in the main body of the printer, a rubber shell(74) formed at the outer peripheral surface and ground to have predetermined surface intensity of illumination by contacting a grinder to the surface with being rotated counterclockwise, so that the intensity of illumination pattern of the surface is inclined counterclockwise.

Description

Carrier Squeeze Device for Wet Electrophotographic Printing Press

The present invention relates to a carrier squeegeeing apparatus for a wet electrophotographic printing press, and more particularly, to a carrier squeezing apparatus for a wet electrophotographic printing press having an improved structure of a squeeze roller provided in a main body of a printing press.

In general, a wet electrophotographic printing machine is provided with a developer for transferring a desired image onto a photosensitive medium such as a photosensitive belt by using a developer mixed with a solid toner having a predetermined color and a liquid carrier serving as a solvent. As shown in FIG. 1, the developing device transfers the developing solution I supplied through the injection nozzle 20 to the transfer surface 11a of the photosensitive belt 11 while being rotated while being installed inside the developing body main body 10. A carrier squeegeeing device is provided for separating the liquid carrier (C) from the developing roller (12) and the developing solution (I) transferred to the transfer surface (11a) and recovering the liquid back into the developing body (10).

The carrier squeezing device has a cylindrical shaft 32 and a rubber shell 34 formed to surround the outer circumferential surface of the shaft 32 as shown in FIGS. 1 and 2, and the contact squeezing belt 11 rotates in contact with the photosensitive belt 11. It is configured to include a squeeze roller 30 is installed so as to contact the outer circumferential surface of the squeeze roller 30 and the blade 14 to remove the liquid carrier (C) attached to the surface. The surface of the rubber shell 34 is rotated in a clockwise direction while contacting the surface thereof with an abrasive tool such as a grinder (not shown). Therefore, the surface of the rubber shell 34 is provided with a predetermined roughness pattern 34a formed to be inclined clockwise. The roughness pattern 34a has a sawtooth shape. The squeeze roller 30 having such a configuration rotates in the traveling direction by the frictional force of the photosensitive belt 11 and compresses the transfer surface 11a to film the toner T in the developer I transferred there. To be angry. Carriers C other than the filmed toner T are separated from the transfer surface 11a by the squeeze roller 13 and flowed down, and then dropped into the developer main body 10 by the blades 14. It is recovered.

By the way, in the conventional carrier squeegeeing apparatus as described above, the roughness pattern 34a is inclined in a direction opposite to the rotational direction of the squeeze roller 30 during the squeezing operation, that is, in the clockwise direction. When 34a is in contact with the photosensitive belt 11, it is elastically deformed and pressed to eject the carrier C sandwiched therebetween. At this time, a small vortex is generated by the ejected carrier C, and the binding force between the particles of the toner T adhered to the transfer surface 11a is reduced by the vortex. Therefore, there is a problem that the particles are separated from the toner T attached to the transfer surface 11a so that the quality of the image to be eventually printed on the printing paper is degraded.

The present invention has been devised to solve the above problems, and the wet type is improved in the structure of the roughness pattern formed on the surface of the rubber shell of the squeeze roller to suppress the toner particles from being separated from the transfer surface of the photosensitive belt and effectively remove the carrier. It is an object of the present invention to provide a carrier squeezing device for an electrophotographic printing press.

1 is a schematic configuration diagram showing a part of a printing machine to which a carrier squeegeeing device of a conventional wet electrophotographic printing machine is applied.

FIG. 2 is an enlarged view of portion A of FIG. 1; FIG.

3 is a schematic configuration diagram showing a part of a printing machine to which a carrier squeegeeing device of a wet electrophotographic printing press according to an embodiment of the present invention is applied.

4 is an enlarged view of a portion B of FIG. 3;

5 is a schematic configuration diagram for explaining a processing process of the squeeze roller shown in FIG.

6 is a schematic configuration diagram for explaining the operation of the carrier squeegeeing apparatus of the wet electrophotographic printing press according to the embodiment of the present invention.

<Brief description of the main symbols in the drawings>

11..Photosensitive belt 50. Developing body

52 .. Development roller 60 .. Spray nozzle

70..squeeze roller 72..shaft

74. Rubber shell 80. Blade

90..Grinder

The present invention for achieving the above object is a squeeze roller installed on the main body of the printer to rotate in contact with the photosensitive belt in order to remove the liquid carrier attached to the surface of the photosensitive belt, and the surface of the squeeze roller in contact with the outer surface A carrier squeegeeing apparatus for a wet electrophotographic printing press, comprising a carrier attached to a carrier and a blade for removing toner, wherein the squeeze roller comprises a shaft rotatably mounted at both ends of the printer body, and on an outer circumferential surface of the shaft. And a rubber shell which is polished to have a predetermined surface roughness by contacting the grinder with its surface while rotating in a counterclockwise direction and processed so that the roughness pattern of the surface is inclined counterclockwise.

Hereinafter, a carrier squeegeeing apparatus for a wet electrophotographic printer according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic diagram illustrating a part of a printer to which a carrier squeegeeing device for a wet electrophotographic printer according to an embodiment of the present invention is applied. As shown in the drawing, the wet remnant photo printing press uses a photosensitive belt 11 traveling on an endless track, and a developer I sprayed from the injection nozzle 60 on the transfer surface 11a of the photosensitive belt 11. Carrier squeeze provided in the main body 50 to squeeze the carrier C from the developing roller 52 attached to the developing body main body 50 and the developing solution I attached to the said transfer surface 11a so that it may adhere. It is configured to include a device.

A developing gap is maintained between the developing roller 52 and the photosensitive belt 11, and the developing solution I sprayed by the potential difference between the developing roller 52 and the photosensitive belt 11 having the electrostatic latent image is formed. It is optionally attached to the transfer surface 11a.

A carrier squeegeeing device is rotated in the developer main body 50 so as to film the toner T out of the developer I attached to the transfer surface 11a and to remove the carrier C in the liquid other than the toner T. The squeeze roller 70, which is installed as possible, and the blade 80 installed to be in contact with the squeeze roller 70 so as to drop the carrier C flowing down the outer circumferential surface of the squeeze roller 70 into the developer main body 50. It is configured to include.

As shown in FIG. 4, the squeeze roller 70 is formed to surround a cylindrical shaft 72 formed of a rigid body such as metal, and an outer circumferential surface of the shaft 72 and is elastically deformable, such as rubber. It has a rubber shell 74 made of a material having excellent friction and adhesion. The squeeze roller 70 is driven by friction force between the rubber shell 74 and the photosensitive belt 11 by contacting the photosensitive belt 70 in which the rubber shell 74 travels in one direction during the squeezing operation. A predetermined roughness pattern 74a having a sawtooth shape is formed on the surface of the rubber shell 74. The serrated shape of the roughness pattern 74a is biased in the rotational direction of the squeeze roller 70, that is, counterclockwise. Therefore, when the squeeze roller 70 is in contact rotation with the photosensitive belt 11, the illuminance pattern 74a is pressed by the photosensitive belt 11 and lying down in its running direction. The roughness pattern 74a is formed in the process of machining the rubber shell 74 on the shaft 72 and then processing it to a predetermined outer diameter. Looking at the processing process with reference to Figure 5, first coating a rubber shell larger than a predetermined outer diameter on the shaft 72 of the squeeze roller 70, and then rotates the squeeze roller 70 counterclockwise. At this time, while rotating the grinder 90 in the clockwise direction to a rotation speed greater than the rotation speed of the squeeze roller 70, the rubber shell 74 is polished by contacting the squeeze roller 70, the rubber shell in this polishing process On the surface of 74, an roughness pattern 74a having a predetermined surface roughness which is inclined counterclockwise is formed. In addition, it is preferable to polish the surface of the rubber shell 74 so that the average roughness is within 1 μm to 1.2 μm in consideration of damage to the photosensitive belt 11.

The operation and effect of the carrier squeegee device for a wet electrophotographic printing press according to an embodiment of the present invention having the above configuration will be described.

First, the developing solution I injected from the injection nozzle 60 is attached to the transfer surface 11a of the photosensitive belt 11 traveling in one direction by the developing roller 52. The toner T, which is a solid, among the developing solution I adhering to the transfer surface 11a is filmed on the transfer surface 11a by the squeeze roller 70. Then, the carrier C, except for the toner T, is squeezed by the squeeze roller 70 and flows down the outer circumferential surface thereof, and is collected by falling into the developer main body 50 by the blade 80. As the carrier C is squeezed as described above, when the squeeze roller 70 is driven in the same direction as the traveling direction of the photosensitive belt 11 to press the toner T, the toner T is pressed. Can be formed into a film without being separated from the transfer surface 11a. In addition, since the illumination pattern 74a is elastically deformed and laid down in its running direction when contacted with the photosensitive belt 11, no vortex due to the elastic deformation of the illumination pattern 74a as in the prior art occurs at the contact portion. .

In addition, after completing the printing operation, as shown in Figure 6, to remove the residual developer (II) forming a drip line (dripline) between the developing roller 52 and the squeeze roller (70) 70 is rotated in a direction opposite to the traveling direction of the photosensitive belt (11). That is, as the squeeze roller 70 is rotated, the residual developer (II) attached to the transfer surface 11a of the photosensitive belt 11 is scraped off, and the residual developer (II) adhered to the outer circumferential surface of the squeeze roller 70 is It is removed by the blade 80. At this time, when the squeeze roller 70 rotates, the blade 80 naturally contacts the roughness pattern 74a on the surface of the rubber shell 74, thereby elastically deforming the roughness pattern 74a. Then, even when the roughness pattern 74a is elastically deformed and laid down, even a small amount of residual developer II stuck to the roughness pattern 74a can be removed by the blade 80.

Although the present invention has been described with reference to the accompanying drawings only for a limited embodiment, those skilled in the art should be understood that there may be further modifications within the scope of the technical idea of the present invention.

According to the carrier squeegeeing apparatus for a wet electrophotographic printing press of the present invention as described above, the separation of the toner to be filmed on the transfer surface of the photosensitive belt is prevented by the roughness pattern of the surface of the rubber shell which is polished while being rotated counterclockwise. In addition, the residual developer adhering to the squeeze roller can be effectively removed.

Claims (2)

A squeeze roller installed in the main body of the printer to rotate in contact with the photosensitive belt to remove the liquid carrier adhered to the surface of the photosensitive belt, and a blade contacting the outer circumferential surface of the squeeze roller to remove the carrier and toner attached to the surface A carrier squeegeeing apparatus for a wet electrophotographic printing machine comprising: The squeeze roller, A shaft whose ends are rotatably mounted to the printer main body; A rubber shell formed on an outer circumferential surface of the shaft and polished to have a predetermined surface roughness by contacting the grinder on the surface while rotating in a counterclockwise direction and processed so that the roughness pattern of the surface is inclined counterclockwise; Carrier squeezing device for a wet electrophotographic printing machine, characterized in that. The method of claim 1, Carrier squeezing device for a wet electrophotographic printing machine, characterized in that the average roughness of the surface of the rubber shell is 1 to 1.2㎛.