KR100370197B1 - Liquid type electrophotographic printer - Google Patents

Abstract

A wet electrophotographic printer is disclosed. A drying unit having a photosensitive medium circulating on an endless track, a developing unit for developing an image on the photosensitive medium, a drying roller which contacts with the photosensitive medium and rotates to dry the developing solution, and an image developed on the photosensitive medium. A transfer unit having a transfer roller and a fixing roller to be transferred to the transfer roller, and heating means for heating the drying roller, the transfer roller and / or the fixing roller, the heating means comprising: a lamp for generating light, A reflecting mirror reflecting the irradiated light, and arranged between the drying roller, the transfer roller and / or the fixing roller and the reflecting mirror to focus the light reflected from the reflecting mirror to the surface of the drying roller, the transfer roller and / or the fixing roller. It is provided with a focusing lens for forming. According to such a printing press, it is possible to shorten the time required to heat the surface of the drying roller, the transfer roller and / or the fixing roller to its target temperature after starting, thereby shortening the preparation time of the print job.

Description

Liquid type electrophotographic printer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet electrophotographic printing press, and more particularly, to a wet electrophotographic printing press having an improved structure of a heating means for heating a surface of a drying roller, a transfer roller and / or a fixing roller.

In general, a wet electrophotographic printing machine forms a latent electrostatic image by scanning a laser beam through a laser scanning unit (LSU) on a photosensitive medium, and develops the photosensitive medium with a developer mixed with a toner and a carrier. It is a device for printing on paper.

Referring to FIG. 1, a general wet electrophotographic printing machine includes a photosensitive medium 140 that is wound around a plurality of guide rollers 110, 120, and 130, and an image corresponding to an electrostatic latent image on the photosensitive medium 140. And a developing unit 160, a drying unit 170 for drying the carrier remaining on the photosensitive medium 140 after development, and a transfer unit 180 for transferring the developed image to the paper 200. .

The drying unit 170 is a drying roller 171 for drying the carrier of the developer developed on the photosensitive medium 140, and is rotated in close contact with the drying roller 171 to heat the drying roller 171. And heating rollers 175.

And, the drying roller 171 is located inside the lipophilic layer 172 that can absorb the carrier, and the lipophilic layer 172 so that the absorbed carrier to stay in the lipophilic layer 172 It has a semi-oily layer 173 to be.

The transfer unit 180 rotates while facing the transfer roller 181 and the transfer roller 181 to transfer the image formed on the photosensitive medium 140 to the paper 200, and enters between the transfer roller 181 And a fixing roller 185 for fixing the image by thermally compressing the sheet of paper 200.

Here, in order to enable a normal printing operation, the drying unit 170 and the transfer unit 180, that is, the drying roller 171, the transfer roller 181 and the mounting roller 185, respectively, the target temperature is set to the target surface. Must be maintained.

To this end, heaters 176, 182 and 186 are embedded in the heating rollers 175 and the transfer rollers 181 and the fixing rollers 185, which are rotated in close contact with the drying roller 171.

When the heater 176 of the heating roller 175 generates heat, the outer surface of the heating roller 175 is heated to heat and dry the carrier absorbed by the lipophilic layer 172. In addition, in the case of the transfer roller 181, when the heater 182 generates heat, heat is conducted from the inside of the transfer roller 181 to raise the temperature of the outer surface of the transfer roller 181.

However, since each of the heaters described above is provided inside the heating roller, the transfer roller, and the fixing roller, there is a disadvantage in that the time for raising the temperature of the outer surface, that is, the warm-up time, becomes long. In order to maintain the heating temperature of the heater must be higher than the external surface temperature has the disadvantage of increasing the electricity consumption.

The present invention was devised to improve the above problems, and by directly and intensively heating the surface of the drying roller, heating roller, transfer roller and / or fixing roller, it shortens the time to reach the target temperature, and consumes electricity It is an object of the present invention to provide a wet electrophotographic printing press that can reduce the number.

1 is a view schematically showing a conventional wet electrophotographic printing press,

2 is a view schematically showing a wet electrophotographic printing press according to an embodiment of the present invention;

3 is a cross-sectional view showing a first embodiment of the heating means according to the present invention;

4 is a cross-sectional view showing a second embodiment of the heating means according to the present invention;

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

11, 12, 13 ... guide roller 14 ... photosensitive media

17. Developing unit 20 ... Drying unit

21 ... drying roller 24 ... heating roller

25 1st lamp 26 ... 1st reflector

27.First focusing lens 29 ... 2nd focusing lens

29a ... first focusing section 29b ... second focusing section

30 ... Transfer Unit 31 ... Transfer Roller

32.Fixed roller 35 ... 2nd lamp

36.2nd reflector 37 ... 3rd focusing lens

40.Paper

In order to achieve the above object, the present invention provides a drying unit having a photosensitive medium circulating on an orbit, a developing unit for developing an image on the photosensitive medium, and a drying roller for drying the developing solution while rotating in contact with the photosensitive medium. And a transfer unit having a transfer roller and a fixing roller for transferring the image developed on the photosensitive medium to a paper, and a heating means for heating the dry roller, the transfer roller and / or the fixing roller. The heating means comprises: a lamp for generating light, a reflecting mirror for reflecting light irradiated from the lamp, and disposed between the drying roller, the transfer roller and / or the fixing roller and the reflecting mirror and reflected from the reflecting mirror. And a focusing lens for focusing light onto the surface of the drying roller, the transfer roller and / or the fixing roller. And a gong.

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

Referring to FIG. 2, the wet electrophotographic printing press according to the present invention is supported by a plurality of guide rollers 11, 12, and 13 to circulate, and a static electricity on the photosensitive medium 14. A developing unit 17 for developing an image corresponding to a latent image, a drying unit 20 for drying a carrier remaining on the photosensitive medium 14 after development, and an image developed on the photosensitive medium 14 And transfer means for heating the drying unit 20 and the transfer unit 30 and the transfer unit 30 to maintain a predetermined temperature condition.

The heating means includes a first heating means mounted in the drying unit 20 and a second heating means mounted on the transfer unit 30.

The drying unit 20 includes a drying roller 21 which contacts the photosensitive medium 14 to dry the developed image. Here, the drying roller 21 has a lipophilic layer 22 absorbing the carrier remaining in the photosensitive medium 14, and the carrier absorbed in the lipophilic layer 22 inside the lipophilic layer 22 It includes a semi-oily layer 23 to stay.

2 and 3, a first heating means according to an embodiment includes a first lamp 25 for generating light and a first lamp 25 installed around the first lamp 25 to reflect incident light. The first reflecting mirror 26 for directing the light irradiated at 25 in one direction and the light traveling in one direction by the first reflecting mirror 26 are focused on a part of the surface of the drying roller 21. It comprises a first focusing lens (27). Here, the first lamp 25 is a rod-shaped having a length corresponding to the length of the drying roller 21, it is preferable that the infrared lamp for irradiating light in the infrared region of the hot wire.

In this case, in consideration of drying efficiency, the drying unit 20 may further include a heating roller 24 which contacts and rotates the surface of the drying roller 21 and heats the contacted surface. The heating roller 24 has a structure in which a heater is mounted in the roller as in the conventional heating roller described above with reference to FIG. 1.

Referring to FIG. 4, the first heating means according to another embodiment includes a first lamp 25, a first reflector 26 for directing light emitted from the first lamp 25 in one direction, The first reflecting mirror 26 includes a second focusing lens 29 for focusing light traveling in one direction simultaneously with the surface of the drying roller 21 and the surface of the heating roller 24. To this end, the second focusing lens 29 includes a first focusing part 29a for focusing light onto the drying roller 21 and a second focusing part 29b for focusing light onto the heating roller 24. ) In the drawings, for example, the first focusing unit 29a and the first focusing unit 29b are integrally formed. However, the first focusing unit 29a and the first focusing unit 29b are merely illustrative. ) May be arranged separately within a range in which one incident light can be separated into two paths and focused at two positions. Of course, the heating roller 24 according to the present embodiment is not mounted inside the heater.

Referring to FIG. 2, the transfer unit 30 rotates while facing the transfer roller 31 and the transfer roller 31 for transferring an image formed on the photosensitive medium 14 to the paper 40. And a fixing roller 32 for fixing the image by thermocompressing the paper 40 entered into and out of the 31.

The second heating means includes a second lamp 35 installed on the transfer roller 31, a second reflector 26 for directing the light emitted from the second lamp 25 in one direction, and And a third focusing lens 37 for focusing light traveling in one direction by the second reflecting mirror 26 to the surface of the transfer roller 31. At this time, the second heating means is preferably installed in the drying roller 21 side direction (left side of the transfer roller in the drawing) so as to contact the photosensitive medium 14 immediately after the transfer roller 31 is heated.

In addition, although the configuration in which the second heating means according to the present embodiment is installed on the transfer roller 31 has been described, it is, of course, installed on the fixing roller 32 to heat the surface of the fixing roller 32. At this time, the second lamp 35 installed in the fixing roller 32 is in close contact with the transfer roller 31 immediately after the fixing roller 32 is heated in consideration of the heating efficiency of the fixing roller 32. It is preferable to be provided in the direction in which the paper 40 is supplied (right side of the fixing roller in the drawing).

Thus, the printing machine according to the present invention is installed on the outside of the drying roller and the heating roller and the transfer roller and the fixing roller, a lamp, a reflector and a focusing lens to be heated by light is provided on the surface of the drying roller, the heating roller, the transfer roller and the fixing roller By locally heating the directly, it is possible to reduce the heating time.

As described above, the wet electrophotographic printing press according to the present invention shortens the time required to directly heat the surface of the roller to rise to its target temperature, thereby shortening the preparation time for the print job, and by heating only the surface of each roller, It has the effect of minimizing consumption.

Claims (3)

A drying unit having a photosensitive medium circulating on an endless track, a developing unit for developing an image on the photosensitive medium, a drying roller which contacts with the photosensitive medium and rotates to dry the developing solution, and an image developed on the photosensitive medium. A wet electrophotographic printing machine comprising: a transfer unit having a transfer roller and a fixing roller to be transferred to and a heating means for heating the drying roller, the transfer roller and / or the fixing roller, The heating means, A lamp for generating light, A reflector reflecting light irradiated from the lamp, And a focusing lens disposed between the drying roller, the transfer roller and / or the fixing roller, and the reflector to focus the light reflected from the reflecting mirror to be formed on the surface of the drying roller, the transfer roller and / or the fixing roller. Characterized by a wet electrophotographic printing press. The method of claim 1 The drying unit includes heating rollers for heating the drying roller, the focusing lens of the heating means, A first focusing unit for focusing light with the drying roller; And a second focusing portion for focusing light with the heating roller. The method according to claim 1 or 2, The lamp is a wet electrophotographic printer, characterized in that the infrared lamp is irradiated with a lot of wavelength in the infrared region.