KR19980062715U - Fuser Unit of 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 that can secure a constant nipper of the compression roller in close contact with the heating roller.

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

The present invention is to provide a fixing apparatus of the electrophotographic processor to maintain a constant nip pressure between the heating roller and the compression roller by forming a plurality of through holes in the silicon rubber of the compression roller in contact with the heating roller. .

All. The gist of the solution of the invention.

The fixing apparatus of the electrophotographic processor of the present invention forms a through-hole in a heating roller for melting a toner image formed on a recording sheet by high temperature heat emitted from a halogen lamp, and a silicon rubber of a pressing roller in close contact with a lower side of the heating roller. It is characterized in that the elasticity is good to maintain a constant nip pressure between the heating roller and the pressing roller.

la. Important uses of the devise.

Fuser unit of an electrophotographic processor.

Description

Fuser Unit of Electrophotographic Processor

The present invention relates to a fixing device of an electrophotographic processor such as a laser beam printer, a copier, a general paper facsimile machine, and a multifunction device. A fuser device is provided for maintaining a constant nip pressure.

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 56 is electrically uniformly charged by the corona discharge of the charging roller 42, and the portion charged by the rotation of the photosensitive drum 56 forms an image through the exposure part 41. When the surface of the photosensitive drum 56 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 56 is developed with toner while passing through the developer 44 to become a visible image.

Thereafter, the recording paper 46 mounted on the paper feed cassette 47 is fed to the feed roller 47 side by the pickup roller 45. Thereafter, the fed recording paper 46 is transferred to the transfer roller 48 side by the rotation of the transfer roller 47. Thereafter, the toner image on the surface of the photosensitive drum 56 is transferred onto the recording paper 46 by the high pressure action of the transfer roller 48. Thereafter, the recording paper 46 having the image formed thereon is conveyed, and the image is fixed by heat and pressure while passing between the heating roller 51 and the pressing roller 52 of the fixing unit 50. Thereafter, the printed recording paper 46 is transferred to the side or the top of the pedestal 58 via the discharge roller 54, so as to print desired by the user.

On the other hand, residual toner and a latent image exist on the surface of the photosensitive drum 56 passing through the transfer roller 48, wherein the toner is removed by the cleaner 40, and the residual charge is removed from the latent image removing lamp 43. It is to be removed by.

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 50 heats the heating roller 51 which melts the toner image formed on the recording paper 46 with high temperature heat. The halogen lamp 51a which heats the heating roller 51 is provided in the center part. Then, a pressing roller 52 for fixing the toner image on the recording paper 46 at a constant pressure is provided on the lower surface of the heating roller 51 in close contact. The pressing roller 52 is usually formed with a shaft 52a, a silicon rubber 52b, and a tubing portion 52c coated or tubing on the surface. The pressing roller 52 was used to reduce the strength of the rubber or to reduce the hardness of the rubber to tubing treatment in order to improve the elasticity of the surface of the silicon rubber (52a) to secure the nip on the heating roller (51).

The pressing roller of the fixing unit as described above has a limitation in reducing the hardness of the rubber by sharply reducing the hardness of the rubber, and deteriorating the surface roughness resulting in poor toner releasability. Therefore, lowering the hardness to 30 degrees or less has a problem. In addition, lowering the hardness of the silicon rubber by about 15 degrees and tubing on the surface can reduce the hardness because there is no separate post-processing of the rubber, but there is a problem that the effect of lowering the actual hardness is very low since the elasticity sharply drops after tubing.

In order to solve the above problems, an object of the present invention is to form a plurality of through holes in the silicon rubber of the pressing roller in contact with the heating roller to improve the elasticity to maintain a constant nip pressure between the heating roller and the pressing roller A fixing device of an electrophotographic processor is provided.

Another 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 sheet.

In order to achieve the above object, 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 high temperature heat emitted from a halogen lamp, and a compression roller in close contact with a lower side of the heating roller. Through-holes are formed in the silicon rubber to improve elasticity, thereby maintaining a constant nip pressure between the heating roller and the compression roller.

1 is a schematic diagram of an electrophotographic recording apparatus commonly used.

Figure 2 is a side view showing the configuration of the heating roller and the pressing roller of the conventional fixing machine.

Figure 3 is a side view showing the configuration of the heating roller and the pressing roller of the fixing unit according to an embodiment of the present invention.

4 is a configuration diagram of the fixing machine pressing roller of the present invention.

Explanation of symbols for the main parts of the drawings

50: fuser 51: heating roller

51a: halogen lamp 52: press roller

52a: shaft 52b: silicon rubber

52c: tubing portion 52d: through hole

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 3 is a side view showing the configuration of the heating roller and the pressing roller of the fixing machine according to an embodiment of the present invention, Figure 4 is a block diagram of the fixing machine pressing roller of the present invention. Referring to the configuration and operation of the present invention with reference to it.

In the electrophotographic processor, the fixing unit 50 is a heating roller 51 for melting a toner image formed on the recording paper 46 with high temperature heat, and is in close contact with the heating roller 51 to form a recording paper under pressure. It consists of the press roller 52 which fixes an image to the (46) surface. The heating roller 51 is a halogen lamp (51a) for heating the heating roller 51 by dissipating high temperature heat of about 150 ℃ ~ 200 ℃ inside is installed in the center, the pressing roller 52 is the center The silicon rubber 52b is installed on the shaft 52a of the shaft 52, and the tubing portion 52c is formed by coating or tubing the silicon rubber 52b. The silicon rubber 52b is formed to have a plurality of through holes 52d at regular intervals to improve elasticity so as to maintain a constant nip pressure when the heating roller 51 and the compression roller 52 are installed. The through holes 52d of the silicon rubber 52 form holes at a constant angle and a constant diameter to reduce hardness, and the through holes 52d are arranged in two rows and equally divided at a predetermined angle. .

When the heating roller 51 and the pressing roller 52 of the fixing unit 50 configured as described above are installed, a plurality of through holes 52d are arranged at a constant angle and diameter in the silicon rubber 52 of the pressing roller 52. Since it is formed so that the hardness can be lowered, the pressing roller 52 in close contact with the heating roller 51 can maintain the maximum nip width with a small hardness by the through hole 52d.

As described above, when a fixing apparatus of an electrophotographic processor powers on a printer, the printer is warmed up to perform a printing operation. Thereafter, the halogen lamp 51a heats the surface of the heating roller 51 to a predetermined temperature to heat the surface to a predetermined temperature. Thereafter, when the temperature of the surface of the heating roller 51 rises to an appropriate value, a thermoistor (not shown) senses this to control the temperature, and at the same time, the pressing roller 52 is heated by the heat of the heat lamp 51. It is heated to an appropriate temperature.

Subsequently, when the toner image is fixed on the recording paper 46 by the transfer roller 50 as described in FIG. 1, the recording paper 46 is guided by the heating guide 51 and the pressing roller ( 52). Thereafter, as shown in FIG. 3, the toner image is fixed on the recording paper 46 by the high temperature heat of the heating roller 51 and the pressure of the pressing roller 52. As shown in FIG. Thereafter, the recording paper 46 is transferred to the discharge roller side by the rotation of the heating roller 51 and the pressing roller 52 to complete printing.

As described above, the fixing apparatus of the electrophotographic processor according to the embodiment of the present invention can reduce the hardness of the rubber by forming a plurality of through holes in the silicon rubber of the pressing roller that is in contact with the heating roller, thereby contacting the heating roller. The nip width of the press roller is always kept constant, so that the toner image on the recording paper can be completely fixed.

Claims (3)

In the fuser device of an electrophotographic processor, The fixing unit is a heating roller for melting a toner image formed on a recording sheet by high temperature heat emitted from a halogen lamp, and a pressing roller installed under the heating roller forms a plurality of through holes at regular intervals in a silicon rubber installed in a shaft. Fixing device of the electrophotographic processor characterized in that the elasticity is improved so that the nip pressure is kept constant when the heating roller and the pressing roller are installed. The fixing device of claim 1, wherein the through-holes of the silicon rubber are formed to reduce hardness by forming holes at a predetermined angle and a predetermined diameter. The fixing device of an electrophotographic processor according to claim 2, wherein the through-holes of the silicon rubber are arranged in two rows and equally divided at a predetermined angle.