KR19980039839A - Fixture 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 anchoring device of an electrophotographic processor that can achieve constant heating of the fuser and keep the nip width constant at all times.

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

The present invention can be warmed up within a short time by installing a heat lamp for dissipating heat inside the compression roller in contact with the heating roller.

All. Summary of the Solution of the Invention.

The fixing apparatus of the electrophotographic processor of the present invention is a heating roller for melting a toner image formed on a recording paper by a high temperature heat emitted from a halogen lamp, and is provided on one side of the heating roller so that the toner image on the recording paper is uniform with heat. A second compression roller for fixing an image by fixing the first compression roller to melt and fix under pressure and the toner image on the recording paper which is installed on the other side of the heating roller and melted and fixed by the first compression roller Consists of

la. Important use of the invention.

An image forming apparatus of an electrophotographic processor.

Description

Fixing device for an electrophotographic processor.

The present invention relates to a fixing apparatus of an electrophotographic processor such as a laser beam printer, a copying machine, a plain paper facsimile machine, a multifunction machine, and the like, and in particular, the instantaneous heating of the fixing machine and the nip width can always be kept constant. A fixing device of an electrophotographic processor.

A general printing process will be described with reference to FIG. 1 of an image forming apparatus of a conventionally used electrophotographic processor.

The surface of the photosensitive drum 40 is electrically uniformly charged by the corona discharge of the charging roller 44, and the portion charged by the rotation of the photosensitive drum 40 forms an image through the exposure unit 46. When the surface of the photosensitive drum 40 is exposed by receiving an electrical signal, an electrostatic latent image is formed in a portion that receives light in an initial charged state. Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 40 is developed with toner while passing through the developer 48 to become a visible image.

Thereafter, the recording paper 22 mounted on the paper feed cassette 52 is fed to the feed roller 58 side by the pickup roller 56. Thereafter, the fed recording paper 22 is conveyed to the transfer roller 50 side by the rotation of the feed roller 58. Thereafter, the toner image on the surface of the photosensitive drum 40 is transferred onto the recording paper 22 by the high pressure action of the transfer roller 50. Thereafter, the recording paper 22 having the image formed thereon is conveyed and the image is fixed by heat and pressure while passing between the heating roller and the compression roller of the fixing unit 30. Thereafter, the printed recording paper 22 is transferred to the pedestal 60 by the rotation of the discharge roller (not shown), so that the printing desired by the user is achieved.

On the other hand, residual toner and a latent image exist on the surface of the photosensitive drum 40 passing through the transfer roller 50, wherein the toner is removed by the cleaner 42, and the remaining charge is removed by a charge removing lamp. It is done.

The conventional fuser structure for fixing the toner image formed on the recording paper by heat and pressure in the image forming apparatus of the electrophotographic processor operating as described above is shown in FIG. In other words, the fixing unit 30 is provided in a fixing unit frame (not shown), in which a heating roller 18 for melting the toner image formed on the recording paper 22 with high temperature heat. Inside the heating roller 18, a halogen lamp 20 for dissipating high temperature heat of about 150 ° C to 200 ° C to heat the heating roller 18 is installed at the center. Then, the lower surface of the heating roller 18 is engaged with a compression roller 32 for fixing the toner image on the recording paper 22 to a certain pressure.

Referring to the operation state of the conventional fuser configured as described above are as follows.

First, when the printer is powered on, the printer is warmed up to perform a printing operation. Thereafter, the halogen lamp 20 heats the surface of the heating roller 18 to a predetermined temperature, and the compression roller 32 is heated by applying heat from the surface of the heating roller 18. Thereafter, when the temperature of the surface of the heating roller 18 rises to an appropriate value, thermistor (not shown) senses this to control the temperature. At this time, the compression roller 32 is to perform the operation in a state that is not completely heated.

Subsequently, when the toner image is fixed on the recording paper 22 by the transfer roller 50 as described with reference to FIG. 1, the recording paper 22 is guided by a heating guide 18 and a compression roller ( 32) is transferred between. Thereafter, the toner image is fixed on the recording paper 22 by the high temperature heat of the heating roller 18 and the pressure of the compression roller 32. Thereafter, the recording paper 22 is conveyed to the discharge roller side by the rotation of the heating roller 18 and the compression roller 32. Thereafter, the recording paper 22 is transferred to the pedestal 60 by the rotation of the discharge roller, thereby completing the printing process.

In the fixing apparatus of the electrophotographic processor configured as described above, the heating roller is heated to a predetermined temperature by a halogen lamp during a warm-up operation to perform a printing process, but the compression roller has a low thermal conductivity and the heating roller. Since the warm-up time of the printer is long because it is heated by the surface of the printer, and the temperature of the compression roller is automatically controlled by the sensing of the thermostat when the compression roller is not heated to an appropriate temperature value. The printing operation is performed when the temperature is not sufficiently saturated so that the toner image on the recording paper is not completely fixed, and the nip width because the compression roller and the heating roller are in contact with each other only at one point with a constant compressive force. The problem is that the toner image on the recording paper is not completely fixed. The.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to install a heat lamp for dissipating heat inside a compression roller in contact with a heating roller, thereby providing a warm-up of an electrophotographic processor. It is to provide a fixing device.

Another object of the present invention is to provide a fixing apparatus of an electrophotographic processor that can be installed in the compression roller in contact with the heating roller before and after each to keep the nip width constant at all times.

It is another object of the present invention to provide a fixing apparatus of an electrophotographic processor capable of completely fixing a toner image on a recording sheet.

In order to achieve the above object, the fixing apparatus of the electrophotographic processor of the present invention comprises a heating roller for melting a toner image formed on a recording paper by high temperature heat emitted from a halogen lamp, and installed on one side of the heating roller. A first compression roller for melting and fixing the toner image on the recording paper with heat and a constant pressure; and fixing the toner image on the recording paper that is installed on the other side of the heating roller and melted and fixed by the first compression roller. And a second compression roller for fixing an image.

1 is a schematic diagram showing a configuration of an image forming apparatus of an electrophotographic processor commonly used.

Fig. 2 is a side view showing the configuration of a fixing unit for fixing a toner image on a recording paper in an image forming apparatus of an electrophotographic processor according to an embodiment of the prior art.

3 is a side view showing the configuration of a fixing unit for fixing a toner image on a recording paper in an image forming apparatus of an electrophotographic processor according to a preferred embodiment of the present invention;

Figure 4 is a schematic diagram showing the nip width between the heating roller and the compression roller of the fixing unit according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: first compression roller 12: heat lamp

14: guide portion 16: second compression roller

18: heating roller 20: halogen lamp

22: recording paper 30: fuser

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used for the same components, even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a side view showing the configuration of a fixing unit for fixing a toner image on a recording paper in an image forming apparatus of an electrophotographic processor according to an embodiment of the present invention. Figure 4 is a schematic diagram showing the nip width between the heating roller and the compression roller of the fixing machine according to an embodiment of the present invention.

As shown in Fig. 3, the fixing unit 10 is installed in a fixing unit frame (not shown) of a heating roller 18 for melting a toner image formed on the recording paper 22 with high temperature heat. . Inside the heating roller 18, a halogen lamp 20 for dissipating high temperature heat of about 150 ° C to 200 ° C to heat the heating roller 18 is installed at the center. On the one side of the heating roller 18, a first compression roller 10 having a hollow pipe shape and made of silicone rubber is used to melt and fix the toner image on the recording paper 22 at a high temperature with a constant pressure. Is installed. A heat lamp 12 for dissipating high temperature heat to heat the first compression roller 10 is installed in the center of the first compression roller 10.

In addition, the toner image on the recording paper 22, which is melted and fixed by the first compression roller 10 and the heating roller 18, is fixed to the other side of the heating roller 18 at a constant pressure once more. The second compression roller 16, which is full of solid material and has a hardness of about 20 degrees, is installed for fixing. Then, between the first compression roller 10 and the second compression roller 16, the recording paper 22 having the toner image fixed by the first compression roller 10 and the heating roller 18 is the second paper. A guide portion 14 for guiding the feed roller 16 to be smoothly transferred toward the compression roller 16 is provided in the fixing unit frame (not shown).

Referring to the operation state of the fixing device of the electrophotographic processor of the present invention configured as described above are as follows.

First, when the printer is powered on, the printer is warmed up to perform a printing operation. Thereafter, the halogen lamp 20 heats the surface of the heating roller 18 to a constant temperature, and at the same time the heat lamp 12 heats the surface of the first compression roller 10 to a constant temperature. Thereafter, when the temperature of the surface of the heating roller 18 rises to an appropriate value, a thermostat (not shown) senses this to control the temperature, and at the same time, the first compression roller 10 of the heat lamp 12 It is heated to an appropriate temperature by heat.

Subsequently, when the toner image is fixed on the recording paper 22 by the transfer roller 50 as described with reference to FIG. 1, the recording paper 22 is guided by the heating roller 18 and the first compression. It is conveyed between the rollers 10. Thereafter, as shown in FIG. 3, the toner image is fixed on the recording paper 22 by the high temperature heat of the heating roller 18 and the heat and pressure of the first compression roller 10. As shown in FIG. Thereafter, the recording paper 22 is introduced between the second compression roller 16 and the heating roller 18 according to the guide of the guide unit 14, and then the toner image of the recording paper 22 is the second compression roller. By the constant pressure of 16, it is fixed once more and an image is fixed.

At this point, as shown in FIG. 4, the nip width a between the heating roller 18 and the first compression roller 10 and the nip width b between the second compression roller 16 are at two points. The toner image on the recording paper 22 is sufficiently fixed because it always forms a constant nip width. Thereafter, the recording paper 22 is conveyed to the discharge roller side by the rotation of the heating roller 18 and the second compression roller 16. Thereafter, the recording paper 22 is transferred to the pedestal 60 by the rotation of the discharge roller, thereby completing the printing process.

As described above, the fixing apparatus of the electrophotographic processor according to the embodiment of the present invention warms-up for performing a printing operation by installing a heat lamp for dissipating heat inside the compression roller in contact with the heating roller. The time can be significantly shortened, and the compression rollers in contact with the heating rollers are installed before and after each, so that the nip width is always kept constant so that the toner image on the recording paper can be completely fixed.

Claims (4)

In the fixing device of an electrophotographic processor, The fixing unit 30 is provided with a heating roller 18 for melting a toner image formed on the recording paper 22 by a high temperature heat emitted from the halogen lamp 20, and is provided on one side of the heating roller 18 to record the recording. A first compression roller 10 for melting and fixing the toner image on the paper 22 by heat and a constant pressure, and is installed on the other side of the heating roller 18 to be melted and fixed by the first compression roller 10. And a second compression roller (16) for fixing the toner image on the recorded recording paper (22) once again to fix the image. The method of claim 1, wherein the first compression roller 10 is formed of a silicone rubber of a pipe shape, the first compression roller 10 to dissipate high temperature heat to the inside of the first compression roller 10 Fixing apparatus for an electrophotographic processor, characterized in that the heat lamp 12 for heating the surface is installed. The fixing apparatus of an electrophotographic processor according to claim 1, wherein the first compression roller (16) is formed of a material having a hardness of about 20 degrees to fix the toner image on the recording paper (22) at a constant pressure. . According to claim 1, wherein the guide portion 14 for guiding the recording paper 22 is smoothly conveyed to the second compression roller 16 side between the first compression roller 10 and the second compression roller (16) Fixing apparatus for an electrophotographic processor, characterized in that the installation.