KR20000000485U - 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 a fixing machine of an electrophotographic processor composed of a heating roller and a pressure roller.

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

The present invention is to provide a fixing apparatus of an electrophotographic processor having a configuration that can prevent the temperature decrease of the pressure roller when the paper enters between the heating roller and the pressure roller.

All. The gist of the solution of the invention.

The present invention provides a heating roller for melting a toner image formed on a recording paper with high temperature heat, a pressure roller for fixing the toner image on the recording paper at a constant pressure, and a metal material inserted and fixed in the center of the pressure roller. In the fixing apparatus of the electrophotographic processor consisting of a pressure spring for applying a constant pressure to the roller pressing rod, characterized in that the roller pressing rod is provided with a heating means for heating the pressure roller to a predetermined temperature.

la. Important uses of the devise.

The present invention is applied to the fixing unit of the device using the electrophotographic method.

Description

Fixture for Electrophotographic Processor

The present invention relates to an electrophotographic processor such as a laser beam printer, a copier, a facsimile machine, and a multifunction machine. will be.

A configuration of a commonly used electrophotographic processor will be described with reference to FIG. 1.

First, the charging roller 44 electrically and uniformly charges the surface of the photosensitive drum 40. The portion charged by the rotation of the photosensitive drum 40 receives an electrical signal for forming an image through the exposure unit 46 to expose the surface of the photosensitive drum 40. Thereafter, the portion of the initial charged state that receives light forms an electrostatic latent image. Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 40 is developed into a toner while passing through the developer 48 to become a visible image.

Thereafter, the recording sheet 26 loaded in the paper feed cassette 52 is fed to the register roller 58 side by the pickup roller 56. Thereafter, the fed recording paper 26 is transferred to the transfer roller 50 by the rotation of the register roller 58. Thereafter, the toner image on the surface of the photosensitive drum 40 is transferred to the recording paper 26 by the high pressure action of the transfer roller 50. Thereafter, the recording paper 26 on which the image is formed is transferred to the discharge unit 60 by the rotation of the discharge roller (not shown) while passing between the heating roller and the pressure roller of the fixing unit 10, so that printing is desired by the user.

On the other hand, residual toner and a latent image are present on the surface of the photosensitive drum 40 after passing the transfer roller 50, wherein the toner is removed by the cleaner 42, and the residual charge is removed by an unillustrated quenching lamp. Removed.

2 is a configuration diagram of a fixing unit according to an embodiment of the prior art, Figure 3 is a waveform diagram of the temperature and time of the heating roller and the pressure roller.

The conventional fuser structure for fixing the toner image formed on the recording paper by heat and pressure in the electrophotographic processor operating as described above is shown in FIG. That is, the fixing unit 10 is installed in the fixing unit frame (not shown), in which a heating roller 22 for melting the toner image formed on the recording paper 26 with high temperature heat. The inside of the heating roller 22 is provided with a heat lamp 24 for heating the heating roller 22 by dissipating high temperature heat of about 150 ℃ to 200 ℃. Thereafter, the lower surface of the heating roller 22 is provided with a pressure roller 16 made of a silicon material for fixing the toner image 28 on the recording paper 26 at a constant pressure. Inside the pressure roller 16 is a roller fixing rod 16a made of stainless steel. Both side surfaces of the roller fixing rod 16a are mounted with bushings 18 to prevent wear of the pressure roller 16 when rotating in contact with the heating roller 22. In addition, a pressure spring 20 for pressurizing the pressure roller 16 at a constant pressure is installed below the pressure roller 16.

However, as shown in FIG. 3, the fixing unit having the above configuration maintains a constant temperature at the entry point A where the recording paper passes between the heating roller and the pressure roller, but the pressure roller has a sharp drop in temperature. Degradation of the fixing unit of the fixing unit is lowered, and as a result, there is a problem of lowering the performance of the device.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a fixing apparatus of an electrophotographic processor having a configuration capable of preventing a temperature drop of a pressure roller when a sheet enters between a heating roller and a pressure roller.

Another object of the present invention is to provide a fixing apparatus of an electrophotographic processor that can improve the fixing performance of the device by reducing the temperature change of the pressure roller.

In order to achieve the above object, the present invention provides a heating roller for melting a toner image formed on a recording paper with high temperature heat, a pressure roller for fixing the toner image on the recording paper at a constant pressure, and at the center of the pressure roller. An electrophotographic processor fixing apparatus comprising a pressurizing spring for applying a predetermined pressure to a roller pressurizing rod made of a metal material, the roller pressurizing rod being heated to a predetermined temperature by installing a heating means. It is done.

1 is a block diagram of a general electrophotographic processor.

2 is a block diagram of a fixing unit according to an embodiment of the prior art.

3 is a waveform diagram of the temperature and time of the heating roller and the pressure roller according to an embodiment of the prior art.

Figure 4 is a block diagram of a fixing unit according to an embodiment of the present invention.

Figure 5 is a cross-sectional view of the pressing roller according to an embodiment of the present invention.

Figure 6 is a waveform diagram relating to the temperature and time of the heating roller and the pressure roller according to an embodiment of the present invention.

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

20: pressure spring 22: heating roller

24: heat lamp 26: recording paper

30: pressure roller 32: roller pressing rod

34: heating filament

Hereinafter, a preferred embodiment 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 subject matter of the present invention, the detailed description thereof will be omitted.

Figure 4 is a block diagram of a fixing unit according to an embodiment of the present invention, Figure 5 is a cross-sectional view of the pressure roller, Figure 6 is a waveform diagram of the temperature and time of the heating roller and the pressure roller.

As shown in Figs. 4 and 5, the fixing unit according to the present invention is provided in the fixing unit frame, in which the heating roller 22 for melting the toner image 28 formed on the recording paper 26 with high temperature heat is not shown. The heat lamp 24 is installed inside the heating roller 22 to heat the heating roller 22 by dissipating high temperature heat. Thereafter, the lower surface of the heating roller 22 is provided with a pressure roller 30 made of a silicon material for fixing the toner image 28 on the recording paper 26 at a constant pressure.

Thereafter, the pressure roller 30 is configured with a roller fixing rod 32 made of a metallic material. In addition, both sides of the roller fixing rod 32 is mounted with a bushing 18 to prevent wear of the pressure roller 30 when rotating in contact with the heating roller 22. In addition, a pressure spring 20 for pressing the pressure roller 30 at a constant pressure is installed below the pressure roller 30.

Thereafter, the roller fixing rod 32 is inserted with a heating filament 34 in the center to heat the pressure roller 30 to a predetermined temperature. That is, when power is supplied to the heating filament 34, it is heated to transfer heat to the pressure roller 30. In addition, the roller fixing rod 32 is formed of an aluminum material with good thermal conductivity.

When the recording paper 26 enters between the heating roller 22 and the pressure roller 30 of the fixing unit configured as described above, as shown in FIG. 3, it can be seen that the temperature change of the pressure roller 30 is kept constant even at the paper entry point B. FIG.

As described above, the fixing unit having the configuration according to the embodiment of the present invention, even if the paper enters between the heating roller and the pressure roller is maintained in the heating roller temperature by the heat lamp, the pressure roller is maintained at a constant temperature by the heating filament As a result, the fixing performance is improved, and as a result, the performance of the device can be improved.

Claims (3)

A heating roller for melting the toner image formed on the recording paper with high temperature heat, a pressure roller for fixing the toner image on the recording paper at a constant pressure, and a metal roller pressing rod inserted into and fixed to the center of the pressure roller; In the fixing device of an electrophotographic processor consisting of a pressure spring that applies a constant pressure to the Fixing apparatus of the electrophotographic processor, characterized in that for heating the pressure roller to a predetermined temperature by installing a heating means in the roller pressing rod. The method of claim 1, The roller pressing rod is a fixing device of the electrophotographic processor, characterized in that formed with a good thermal conductivity of the aluminum material. The method of claim 1, And a heating filament inserted into the roller fixing rod by the heating means to heat the pressure roller.