KR19980029510U - 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 apparatus of an electrophotographic processor capable of matching a heating temperature time of a fixing roller and a compression roller to fix a toner image on a recording paper.

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

The present invention can shorten the warm-up time and can completely fix the toner image on the recording paper.

All. The gist of the solution of the invention.

The present invention is a fixing apparatus for an electrophotographic processor comprising a second heating roller for melting a toner image formed on a recording paper with high temperature heat and a compression roller for fixing the toner image on the recording paper at a constant pressure. One side of the roller is provided with a first heating roller which matches the heating temperature time of the second heating roller with the heating temperature time of the compression roller during the wemming-up of the electrophotographic processor.

la. Important uses of the devise.

An image forming apparatus of an electrophotographic processor.

Description

Fixing device for an electrophotographic processor.

The present invention relates to an image forming 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. A fixing device of an electrophotographic processor that can be matched.

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 26 mounted on the paper feed cassette 52 is fed by the pickup roller 56 to the feed roller 58 side. Thereafter, the fed recording paper 26 is transferred to the transfer roller 50 side by the rotation of the transfer roller 58. Thereafter, the toner image 28a on the surface of the photosensitive drum 40 is transferred onto 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 conveyed and the image is fixed by heat and pressure while passing between the heating roller and the compression roller of the fixing unit 10. Thereafter, the printed recording paper 26 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. That is, the fixing unit 10 is installed in a fixing unit frame not shown by a second heating roller 22 which melts the toner image 28a formed on the recording paper 26 with high temperature heat. A second heating lamp 24 is installed inside the second heating roller 22 to heat the second heating roller 22 by dissipating high temperature heat of about 150 ° C to 200 ° C.

The lower surface of the second heating roller 22 is provided with a compression roller 16 made of silicone material for fixing the toner image 28a on the recording paper 26 to a certain pressure. Both sides of the compression roller 16 have a bushing 18 for preventing wear of the compression roller 16 when rotating in contact with the second heating roller 22, and at a constant pressure on the compression roller 16. The pressurizing spring 20 to pressurize is provided.

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 second heat lamp 24 heats the surface of the second heating roller 22 to a predetermined temperature, and the compression roller 16 is heated by applying heat from the surface of the second heating roller 22. Thereafter, when the temperature of the surface of the second heating roller 22 rises to an appropriate value, the thermostat (not shown) detects this to control the temperature. At this time, the compression roller 16 is to perform the operation in a state that is not completely heated. That is, as shown in FIG. 2, the second heating roller 22 is heated to a predetermined temperature at A time and the compression roller 16 is heated to a predetermined temperature at B time.

Subsequently, when the toner image 28a is fixed on the recording paper 26 as described with reference to FIG. 1, the recording paper 26 is guided by a paper guide to the second heating roller 22 and the compression roller 16. Are transported between. Thereafter, the toner image 26b is fixed on the recording paper 26 by the high temperature heat of the second heating roller 22 and the pressure of the compression roller 16. At this time, an unfixed toner image 28a remains on the recording paper 26. Thereafter, the recording paper 22 is conveyed to the discharge roller side by the rotation of the second heating roller 22 and the compression roller 16. Thereafter, the recording paper 26 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 second heating roller is heated to a predetermined temperature by the second heat lamp during the warm-up operation in order to perform a printing process, but the compression roller has a thermal conductivity. Low and heated by the surface of the second heating roller, the warm-up time of the printer is long, and as shown in FIG. 3, the sensing of the thermoster is not detected when the compression roller is not heated to an appropriate temperature value. The temperature is automatically controlled so that the printing operation is performed while the temperature of the compression roller is not sufficiently saturated, resulting in a problem that the toner image on the recording paper is not completely fixed.

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 capable of completely fixing a toner image on a recording paper by installing a first heating roller to be in contact with the surface of a compression roller.

Another object of the present invention is to provide a fixing apparatus for an electrophotographic processor that can shorten a warm-up time for performing a printing process.

Another object of the present invention is to provide a fixing apparatus of an electrophotographic processor that can match the heating temperature time of the heating roller and the compression roller of the fixing machine.

In order to achieve the above object, the present invention provides a second heating roller for melting a toner image formed on a recording paper with high temperature heat, a second heat lamp for dissipating high temperature heat to the second heating roller, and the recording. A fixing apparatus for an electrophotographic processor comprising a compression roller for fixing a toner image on a paper at a constant pressure, and a pressurizing spring for applying a constant pressure to the compression roller, wherein one side of the compression roller has a side when the electrophotographic processor is bent up. Characterized in that the first heating roller is installed to match the time that the surface of the second heating roller is heated to an appropriate temperature and the time that the surface of the compression roller is heated to an appropriate temperature.

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

2 is a side view showing the configuration of a fixing unit for fixing a toner image on a recording sheet according to an embodiment of the prior art;

3 is a graph showing the temperature increase rate of the heating roller surface and the compression roller surface of the fixing unit during the warm-up of the electrophotographic processor according to an embodiment of the prior art.

4 is a side view showing the configuration of a fixing unit for fixing a toner image on a recording paper according to an embodiment of the present invention;

5 is a graph showing the temperature increase rate of the heating roller surface and the compression roller surface of the fixing unit during the warm-up of the electrophotographic processor according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: fixing unit 12: first heating roller

14: first heat lamp 16: compression roller

18: bushing 20: pressure spring

22: 2nd heating roller 24: 2nd heating lamp

26: recording paper

28a: toner image (toner image not fixed on recording paper)

28b: toner image (toner image fixed on recording paper by fixing unit)

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.

4 is a side view showing the configuration of a fixing unit for fixing a toner image on a recording sheet according to an embodiment of the present invention. FIG. 5 is a graph illustrating a temperature increase rate of the heating roller surface and the compression roller surface of the fixing unit during warming-up of the electrophotographic processor according to an exemplary embodiment of the present invention.

As shown in Fig. 4, the fixing unit 10 is a fixing unit not shown by a second heating roller 22 which melts the toner image 28a formed on the recording paper 26 with high temperature heat. It is installed in the frame. A second heating lamp 24 is installed inside the second heating roller 22 to heat the second heating roller 22 by dissipating high temperature heat of about 150 ° C to 200 ° C. In this case, the second heat lamp 24 mainly uses a halogen lamp.

The lower surface of the second heating roller 22 is provided with a compression roller 16 made of silicone material for fixing the toner image 28a on the recording paper 26 to a certain pressure. Both sides of the compression roller 16 have a bushing 18 for preventing wear of the compression roller 16 when rotating in contact with the second heating roller 22, and at a constant pressure on the compression roller 16. The pressurizing spring 20 to pressurize is provided.

In addition, at one side of the compression roller 16, the time when the surface of the second heating roller 22 is heated to an appropriate temperature during the warm-up operation to perform a printing process and the compression In order to match the time for which the surface of the roller 16 is heated to an appropriate temperature, the first heating roller 12 that applies heat to the surface of the compression roller 16 is installed in contact with each other. Inside the first heating roller 12, a first heating lamp 14 for heating the surface of the first heating roller 12 by dissipating high temperature heat to heat the surface of the compression roller 16 is provided. It is installed in the center.

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 second heat lamp 24 heats the surface of the second heating roller 22 to a predetermined temperature, and at the same time, the first heating roller 12 is heated by the first heat lamp 14 to compress the roller. The surface of (16) is heated to a constant temperature. Thereafter, as shown in FIG. 5, when the temperature of the surface of the second heating roller 22 rises to an appropriate value, the thermostat, which is not shown, senses this to control the temperature, and at the same time, the compression roller 16 The heat of the first heating roller 14 is heated to an appropriate temperature. That is, as shown in FIG. 5, the second heating roller 22 is heated to a predetermined temperature at A time, and the compression roller 16 is heated to a predetermined temperature at B time, so that the compression roller 16 is heated. And the second heating roller 22 are heated at about the same time.

Subsequently, when the toner image 28a is fixed on the recording paper 26 as described with reference to FIG. 1, the recording paper 26 is guided by a paper guide to the second heating roller 22 and the compression roller 16. Are transported between. Thereafter, the toner image 26b is completely (100%) fixed on the recording paper 26 by the high temperature heat of the second heating roller 22 and the pressure of the compression roller 16. In this case, the first heating roller 12 is in contact with the compression roller 16 in an idle state to rotate clockwise. Thereafter, the recording paper 22 is conveyed to the discharge roller side by the rotation of the second heating roller 22 and the compression roller 16. Thereafter, the recording paper 26 is transferred to the pedestal 60 by the rotation of the discharge roller, thereby completing the printing process.

As described above, the fixing device of the electrophotographic processor according to the embodiment of the present invention significantly shortens the warm-up operation time because the surface of the second heating roller and the surface of the compression roller are heated to an appropriate temperature at about the same time. This eliminates the inconvenience of the user having to wait for the continuous warm-up time, and also the recording paper as the surface of the compression roller and the surface of the second heating roller are heated at about the same time. The toner image of the image can be fixed completely (100%).

Claims (3)

A second heating roller for melting the toner image formed on the recording paper with high temperature heat, a second heat lamp for dissipating high temperature heat to the second heating roller, and a compression for fixing the toner image on the recording paper at a constant pressure. In the fixing apparatus of an electrophotographic processor composed of a roller and a pressure spring for applying a constant pressure to the compression roller, One side of the compression roller 16 has a time when the surface of the second heating roller 22 is heated to an appropriate temperature and the surface of the compression roller 16 is heated to an appropriate temperature during the wemming-up of the electrophotographic processor. Fixing apparatus for an electrophotographic processor, characterized in that the first heating roller 12 to match the time to be installed. The electrophotographic according to claim 1, wherein a first heat lamp (14) for dissipating high temperature heat is installed inside the first heating roller (12) to heat the surface of the compression roller (16). Fixing unit for the processor. 3. The method of claim 2, wherein the first heat lamp (14) is turned off at the same time as the warm-up operation of the electrophotographic processor is finished, and the first heating roller (12) is in the idle state opposite to the compression roller (16). A fixing device for an electrophotographic processor, characterized by a continuous rotation in a direction.