KR100346682B1 - Printing unit for wet type electrophotographic printer - Google Patents

Printing unit for wet type electrophotographic printer Download PDF

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Publication number
KR100346682B1
KR100346682B1 KR1019980007913A KR19980007913A KR100346682B1 KR 100346682 B1 KR100346682 B1 KR 100346682B1 KR 1019980007913 A KR1019980007913 A KR 1019980007913A KR 19980007913 A KR19980007913 A KR 19980007913A KR 100346682 B1 KR100346682 B1 KR 100346682B1
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South Korea
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photosensitive belt
image
printing unit
electrophotographic printer
developing
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KR1019980007913A
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Korean (ko)
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KR19990074369A (en
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이창수
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삼성전자 주식회사
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Publication of KR19990074369A publication Critical patent/KR19990074369A/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/06Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/104Preparing, mixing, transporting or dispensing developer
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/01Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105Details of unit
    • G03G15/0121Details of unit for developing
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/14Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00Apparatus for electrophotographic processes
    • G03G2215/01Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103Plural electrographic recording members
    • G03G2215/0119Linear arrangement adjacent plural transfer points

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Color Electrophotography (AREA)
  • Wet Developing In Electrophotography (AREA)

Abstract

PURPOSE: A printing unit of a wet electrophotographic printer is provided to prevent the lowering of the printing quality due to the roughness of a surface by coating a transparent ink film on the transfer face of a photosensitive belt. CONSTITUTION: A developing unit of a printing unit comprises an electric charger(26), laser scanners(23a,23b,23c,23d) forming a specific latent electrostatic image by scanning a laser onto a photosensitive belt(20), image developing units(24a,24b,24c,24d) developing an image corresponding to the latent electrostatic image, an electric discharger(25) removing the latent electrostatic image, and a coating developing unit(27) forming a transparent ink film by supplying the transparent ink to the photosensitive belt.

Description

습식 전자사진방식 프린터의 인쇄유니트{Printing unit for wet type electrophotographic printer}Printing unit for wet type electrophotographic printer

본 발명은 습식 전자사진방식 프린터의 인쇄유니트에 관한 것으로서, 더 상세하게는 감광벨트 전사면의 거칠기에 의한 인쇄품질 저하를 완화시킬 수 있도록구조 개선된 습식 전자사진방식 프린터의 인쇄유니트에 관한 것이다.The present invention relates to a printing unit of a wet electrophotographic printer, and more particularly, to a printing unit of a wet electrophotographic printer having an improved structure so as to alleviate print quality degradation due to roughness of the photosensitive belt transfer surface.

예컨대 칼라 레이저 프린터와 같은 습식 전자사진방식 프린터의 인쇄유니트에는, 도 1에 도시된 바와 같이, 무한궤도를 주행하는 감광벨트(10)와, 상기 감광벨트(10)에 원하는 화상을 현상하는 현상부와, 상기 감광벨트(10)에 현상된 화상을 전사받아 용지(1)에 인쇄하는 전사부가 구비되어 있다. 상기 전사부는 상기 감광벨트(10)의 전사면(10a)에 현상된 화상을 전사받아 용지(1)의 일면에 인쇄하는 전사롤러(11)와, 그 전사롤러(11)와 맞물려 회전하면서 용지(1)를 전사롤러(11) 측으로 압착시키는 정착롤러(12)를 포함한다. 그리고 상기 현상부는, 상기 전사롤러(11)로의 전사가 끝난 후 잔존하는 정전잠상을 없애기 위해 상기 감광벨트(10)의 전사면(10a)에 광을 조사함으로써 전위를 제거하는 제전기(15)와, 제전된 감광벨트(10)를 예컨대 600V와 같은 전위로 대전시키는 대전기(16)와, 대전된 전사면(10a)에 레이저를 주사하여 정전잠상을 형성시키는 레이저 스캐너(13a,13b,13c,13d)와, 상기 정전잠상에 대응되는 화상을 현상하는 화상현상기(14a,14b,14c,14d)를 포함하고 있다. 따라서 상기 현상부에서 감광벨트(10)에 현상된 화상은 상기 전사부를 통해 용지(1)에 인쇄되며, 인쇄가 끝난 후에 감광벨트(10)는 다시 현상부를 거치면서 제전과 대전 및 현상이 반복되게 된다.In a printing unit of a wet electrophotographic printer such as a color laser printer, for example, as illustrated in FIG. 1, a photosensitive belt 10 for traveling in an endless track, and a developing unit for developing a desired image on the photosensitive belt 10. And a transfer unit for receiving the image developed on the photosensitive belt 10 and transferring the printed image on the paper 1. The transfer part transfers the image developed on the transfer surface 10a of the photosensitive belt 10 and prints on one surface of the paper 1, and rotates in engagement with the transfer roller 11 to rotate the paper ( And a fixing roller 12 for pressing 1) toward the transfer roller 11 side. The developing unit may include a static eliminator 15 for removing dislocations by irradiating light to the transfer surface 10a of the photosensitive belt 10 to eliminate the latent electrostatic image remaining after the transfer to the transfer roller 11. A charger 16 for charging the charged photosensitive belt 10 to a potential such as 600 V, and a laser scanner 13a, 13b, 13c for scanning a laser on the charged transfer surface 10a to form an electrostatic latent image; 13d) and image developing units 14a, 14b, 14c, and 14d for developing an image corresponding to the electrostatic latent image. Therefore, the image developed on the photosensitive belt 10 in the developing part is printed on the paper 1 through the transfer part, and after the printing is finished, the photosensitive belt 10 passes through the developing part again so that static electricity, charging and developing are repeated. do.

그런데 상기 감광벨트(10)의 전사면(10a)에는 통상 0.5∼2㎛정도의 표면거칠기가 형성되어 있다. 이와 같은 표면거칠기의 존재는 상기 전사부에서 인쇄되는 화상에도 그대로 영향을 주게 된다. 즉, 상기 현상부에서 현상되는 화상은 상기 표면거칠기를 가진 전사면(10a) 위에 그대로 현상되므로, 이 화상 역시 상기 표면거칠기를 따라 그와 같은 경시적인 굴곡을 가지게 된다. 그리고 이 상태에서 상기 전사롤러(11)를 통해 용지(1)에 인쇄가 되기 때문에, 상기 감광벨트(10) 전사면(10a)의 표면거칠기에 따라 움푹 들어간 부위는 정확하게 용지에 인쇄되지 못하는 문제가 있다. 즉, 감광벨트(10) 전사면(10a)의 표면거칠기가 용지(1) 인쇄시에도 그대로 영향을 주는 문제점이 있는 것이다.By the way, the surface roughness of about 0.5-2 micrometers is formed in the transfer surface 10a of the said photosensitive belt 10 normally. The presence of such surface roughness also affects the image printed by the transfer unit as it is. That is, since the image developed in the developing part is developed as it is on the transfer surface 10a having the surface roughness, the image also has such temporal curvature along the surface roughness. In this state, since the printing roller 11 is printed on the paper 1, the recessed portion may not be accurately printed on the paper according to the surface roughness of the transfer surface 10a of the photosensitive belt 10. have. That is, there is a problem in that the surface roughness of the photosensitive belt 10 transfer surface 10a is still affected even when printing the paper 1.

본 발명은 상기의 문제점을 감안하여 창출된 것으로서, 감광벨트 전사면의 거칠기를 완화시킬 수 있도록 구조 개선된 습식 전자사진방식 프린터의 인쇄유니트를 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a printing unit of a wet electrophotographic printer having an improved structure so as to alleviate the roughness of the photosensitive belt transfer surface.

도 1은 종래의 습식 전자사진방식 프린터의 인쇄유니트를 개략적으로 보인 도면,1 is a view schematically showing a printing unit of a conventional wet electrophotographic printer;

도 2는 본 발명에 따른 습식 전자사진방식 프린터의 인쇄유니트를 보인 도면.2 is a view showing a printing unit of the wet electrophotographic printer according to the present invention.

< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>

1...용지20...감광벨트1.Paper 20 ... Photosensitive belt

21...전사롤러22...정착롤러21 ... Transfer Roller 22 ... Fixing Roller

23a,23b,23c,23d...레이저 스캐너23a, 23b, 23c, 23d ... laser scanner

24a,24b,24c,24d...화상현상기25...제전기24a, 24b, 24c, 24d ...

26...대전기27...코팅현상기26. Daejeon 27 ... Coating developer

상기의 목적을 달성하기 위한 본 발명은, 무한궤도를 순환 주행하는 감광벨트와, 상기 감광벨트를 소정 전위로 대전시키는 대전기와, 대전된 상기 감광벨트 상에 레이저를 주사하여 소정의 정전잠상을 형성시키는 레이저스캐너와, 상기 정전잠상이 형성된 감광벨트에 유색잉크를 공급하여 그 정전잠상에 대응되는 화상을 현상하는 화상현상기와, 상기 감광벨트에 현상된 화상을 전사받아 용지에 인쇄하는 전사롤러와, 상기 용지를 사이에 두고 상기 전사롤러와 대향되게 설치되어 상기 용지를 전사롤러 측으로 압착하여 통과시키는 정착롤러 및, 상기 전사롤러에 화상이 전사된 후 상기 감광벨트에 광을 조사하여 그 전위를 떨어뜨림으로써 잔존하는 정전잠상을 제거하는 제전기를 구비하는 습식 전자사진방식 프린터의 인쇄유니트에 있어서, 상기 제전기 후단에는, 제전된 상기 감광벨트에 투명 잉크를 공급함으로써투명한 잉크막을 형성시키는 코팅현상기가 구비된 것을 특징으로 한다.According to the present invention for achieving the above object, a photosensitive belt circulating in an endless track, a charger for charging the photosensitive belt to a predetermined potential, and a predetermined electrostatic latent image is formed by scanning a laser on the charged photosensitive belt. A laser scanner, an image developing device for supplying colored ink to the photosensitive belt on which the electrostatic latent image is formed, to develop an image corresponding to the electrostatic latent image, a transfer roller for transferring the image developed on the photosensitive belt to a paper, A fixing roller which is installed to face the transfer roller with the paper sandwiched therebetween, and presses the paper to the transfer roller side, and after the image is transferred to the transfer roller, irradiates light on the photosensitive belt to lower its potential. In the printing unit of a wet electrophotographic printer having a static eliminator to remove the remaining electrostatic latent image, The rear end group, characterized in that the coating is provided with a developing device to form a film transparent ink by supplying the ink in the transparent antistatic the photosensitive belt.

이하 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시예를 상세히 설명하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 습식 전자사진방식 프린터의 인쇄유니트를 나타낸다.2 shows a printing unit of a wet electrophotographic printer according to the present invention.

도시된 바와 같이, 본 발명의 인쇄유니트는 감광벨트(20)와, 상기 감광벨트(20)로부터 화상을 전사받아 용지에 프린트하는 전사부 및, 상기 감광벨트(20)에 인쇄할 화상을 현상하는 현상부를 구비하고 있다. 먼저 상기 전사부는, 종래와 같이, 상기 감광벨트(20)의 전사면(20a)에 현상된 화상을 전사받아 용지(1)의 일면에 인쇄하는 전사롤러(21)와, 그 전사롤러(21)와 맞물려 회전하면서 용지(1)를 전사롤러(21) 측으로 압착시키는 정착롤러(22)를 포함한다. 상기 현상부는, 상기 감광벨트를 소정 전위로 대전시키는 대전기(26)와, 대전된 상기 감광벨트(20) 상에 레이저를 주사하여 소정의 정전잠상을 형성시키는 레이저 스캐너(23a,23b,23c,23d)와, 상기 감광벨트(20)에 유색잉크를 공급하여 그 정전잠상에 대응되는 화상을 현상하는 화상현상기(24a,24b,24c,24d)와, 상기 전사롤러(21)에 화상이 전사된 후 상기 감광벨트(20)에 광을 조사하여 그 전위를 떨어뜨림으로써 잔존하는 정전잠상을 제거하는 제전기(25)와, 제전된 상기 감광벨트(20)에 투명 잉크를 공급함으로써 투명한 잉크막을 형성시키는 코팅현상기(27)를 구비하고 있다. 상기 코팅현상기(27)에서 사용되는 투명 잉크는, 상기 화상현상기(24a,24b,24c,24d)에서 사용되는 잉크와 달리, 안료를 섞지 않은 토너(toner)로 구성된다. 즉, 상기 화상현상기(24a,24b,24c,24d)에서 사용되는 잉크는, 점착력을 가진 수지(resin)에 색상을 나타내는 안료 및 기타 첨가제를 혼합한 토너를 사용하고 있지만, 상기 투명 잉크는 상기 안료를 제외한 나머지 재료로 구성되어 있어서, 상기 감광벨트(20)의 전사면에 점착 도포만 되고 색상을 나타내지 않게 된다. 그리고 이 투명 잉크는 상기 화상현상기(24a,24b,24c,24d)에서와 마찬가지로 전위가 떨어진 전사면(20a)에 잉크의 토너 입자가 달라붙는 원리로 도포되는데, 상기 코팅현상기(27)가 상기 제전기(25) 후단에 설치되어 있기 때문에, 전위가 거의 0 V로 떨어진 감광벨트(20)의 전사면(20a)에 쉽게 도포될 수 있다.As shown, the printing unit of the present invention includes a photosensitive belt 20, a transfer unit for transferring an image from the photosensitive belt 20 to print on paper, and developing an image to be printed on the photosensitive belt 20. The developing part is provided. First, the transfer unit, as in the prior art, a transfer roller 21 for receiving the image developed on the transfer surface 20a of the photosensitive belt 20 to be printed on one surface of the paper 1, and the transfer roller 21 And a fixing roller 22 for pressing the paper 1 toward the transfer roller 21 while being engaged with and rotating. The developing unit includes a charger 26 for charging the photosensitive belt to a predetermined potential, and laser scanners 23a, 23b, 23c for scanning a laser onto the charged photosensitive belt 20 to form a predetermined electrostatic latent image. 23d), an image developing unit 24a, 24b, 24c, 24d for supplying colored ink to the photosensitive belt 20 to develop an image corresponding to the electrostatic latent image, and an image transferred to the transfer roller 21. Thereafter, the photosensitive belt 20 is irradiated with light to reduce its potential to remove the remaining electrostatic latent image, and a transparent ink film is formed by supplying transparent ink to the photosensitive belt 20. The coating developer 27 is provided. The transparent ink used in the coating developer 27, unlike the ink used in the image developing devices 24a, 24b, 24c, and 24d, is composed of toners without mixing pigments. That is, the ink used in the image developing apparatuses 24a, 24b, 24c, and 24d uses a toner obtained by mixing a pigment with color and other additives with an adhesive resin, but the transparent ink uses the pigment. Since it is composed of the remaining materials, only the adhesive coating on the transfer surface of the photosensitive belt 20 is not expressed color. The transparent ink is applied on the principle that toner particles of the ink adhere to the transfer surface 20a having a dislocation similar to those of the image developing apparatuses 24a, 24b, 24c, and 24d. Since it is provided at the rear end of the electricity 25, it can be easily applied to the transfer surface 20a of the photosensitive belt 20 in which the electric potential has dropped to almost 0V.

상기 구성에 있어서, 먼저 상기 제전기(25)는 상기 전사부를 지난 감광벨트(20)의 전사면(20a)에 광을 조사하여 그 전위를 거의 0 V로 떨어뜨린다. 이는 상술한 바와 같이 전사 완료후 감광벨트(20)에 남아있는 정전잠상을 제거하기 위한 작업이다. 이어서 제전된 이 전사면은 상기 코팅현상기(27)를 통과하면서 그 표면에 투명 잉크막이 코팅된다. 이와 같이 투명 잉크막이 코팅되면, 그 전사면(20a)에 존재하던 표면거칠기가 상기 투명 잉크막에 의해 도포되어 그 굴곡부가 채워지게 된다. 따라서 종래에 비해 거칠기의 정도가 완화된다. 이 상태에서 대전기(26)를 거치며 승압된 후, 상기 레이저 스캐너(23a,23b,23c,23d)와 화상현상기(24a,24b,24c,24d)를 통해 원하는 화상을 현상하게 된다. 이와 같이 현상된 화상은 전사면(20a)의 거칠기가 완화된 상태에서 현상된 것이기 때문에, 상기 전사롤러(21)를 통해 용지에 인쇄될 때에도 그 거칠기의 굴곡에 의한 인쇄품질 저하가 방지된다.In the above configuration, first, the static eliminator 25 irradiates light to the transfer surface 20a of the photosensitive belt 20 past the transfer portion to drop its potential to almost 0V. This operation is for removing the electrostatic latent image remaining in the photosensitive belt 20 after the transfer is completed as described above. Subsequently, the transferred transfer surface passes through the coating developer 27, and a transparent ink film is coated on the surface thereof. When the transparent ink film is coated in this way, the surface roughness existing on the transfer surface 20a is applied by the transparent ink film to fill the bent portion. Therefore, the degree of roughness is alleviated compared with the prior art. In this state, after the step-up is performed through the charger 26, a desired image is developed through the laser scanners 23a, 23b, 23c, and 23d and the image developing units 24a, 24b, 24c, and 24d. Since the developed image is developed in a state where the roughness of the transfer surface 20a is relaxed, the print quality is reduced due to the bending of the roughness even when printed on the paper through the transfer roller 21.

상술한 바와 같이 본 발명에 따른 습식 전자사진방식 프린터의 인쇄유니트는, 감광벨트의 전사면에 투명 잉크막을 코팅하여 표면거칠기를 완화시킴으로써, 종래에 표면거칠기에 따라 인쇄품질이 저하되던 현상을 방지할 수 있다.As described above, the printing unit of the wet electrophotographic printer according to the present invention, by coating a transparent ink film on the transfer surface of the photosensitive belt to mitigate the surface roughness, thereby preventing the phenomenon that the print quality is deteriorated according to the surface roughness in the past. Can be.

본 발명은 상기에 설명되고 도면에 예시된 것에 의해 한정되는 것은 아니며, 다음에 기재되는 청구의 범위 내에서 더 많은 변형 및 변용예가 가능한 것임은 물론이다.It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (1)

무한궤도를 순환 주행하는 감광벨트와, 상기 감광벨트를 소정 전위로 대전시키는 대전기와, 대전된 상기 감광벨트 상에 레이저를 주사하여 소정의 정전잠상을 형성시키는 레이저스캐너와, 상기 정전잠상이 형성된 감광벨트에 유색잉크를 공급하여 그 정전잠상에 대응되는 화상을 현상하는 화상현상기와, 상기 감광벨트에 현상된 화상을 전사받아 용지에 인쇄하는 전사롤러와, 상기 용지를 사이에 두고 상기 전사롤러와 대향되게 설치되어 상기 용지를 전사롤러 측으로 압착하여 통과시키는 정착롤러 및, 상기 전사롤러에 화상이 전사된 후 상기 감광벨트에 광을 조사하여 그 전위를 떨어뜨림으로써 잔존하는 정전잠상을 제거하는 제전기를 구비하는 습식 전자사진방식 프린터의 인쇄유니트에 있어서,A photosensitive belt circulating in an endless track, a charger for charging the photosensitive belt to a predetermined potential, a laser scanner for scanning a laser on the charged photosensitive belt to form a predetermined electrostatic latent image, and a photosensitive formed photostatic latent image An image developing device for supplying colored ink to a belt to develop an image corresponding to the electrostatic latent image; a transfer roller for transferring the image developed on the photosensitive belt to a paper; And a fixing roller for pressing and passing the paper toward the transfer roller and an electrostatic eliminator for removing the remaining electrostatic latent image by irradiating light on the photosensitive belt and lowering its potential after the image is transferred to the transfer roller. In the printing unit of a wet electrophotographic printer provided, 상기 제전기와 상기 화상현상기 사이에는, 제전된 상기 감광벨트에 투명 잉크를 공급함으로써 표면거칠기가 완화되도록 투명한 잉크막을 형성시키는 코팅현상기가 구비된 것을 특징으로 하는 습식 전자사진방식 프린터의 인쇄유니트.A printing unit of a wet electrophotographic printer, wherein a coating developer is provided between the static eliminator and the image developing unit to form a transparent ink film to reduce surface roughness by supplying transparent ink to the photosensitive belt.
KR1019980007913A 1998-03-10 1998-03-10 Printing unit for wet type electrophotographic printer KR100346682B1 (en)

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JPH0511566A (en) * 1991-06-30 1993-01-22 Ricoh Co Ltd Image forming method and device
JPH07271262A (en) * 1994-03-30 1995-10-20 Ricoh Co Ltd Image forming device
JPH08292654A (en) * 1995-04-19 1996-11-05 Ricoh Co Ltd Cleaning device
JPH09230722A (en) * 1996-02-21 1997-09-05 Dainippon Printing Co Ltd Image fixing device and its method and fixer used therefor

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Publication number Priority date Publication date Assignee Title
JPH0511566A (en) * 1991-06-30 1993-01-22 Ricoh Co Ltd Image forming method and device
JPH07271262A (en) * 1994-03-30 1995-10-20 Ricoh Co Ltd Image forming device
JPH08292654A (en) * 1995-04-19 1996-11-05 Ricoh Co Ltd Cleaning device
JPH09230722A (en) * 1996-02-21 1997-09-05 Dainippon Printing Co Ltd Image fixing device and its method and fixer used therefor

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