KR100425320B1 - Transfer belt cleaning apparatus of electrophotographic image forming device - Google Patents
Transfer belt cleaning apparatus of electrophotographic image forming device Download PDFInfo
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- KR100425320B1 KR100425320B1 KR10-2002-0001883A KR20020001883A KR100425320B1 KR 100425320 B1 KR100425320 B1 KR 100425320B1 KR 20020001883 A KR20020001883 A KR 20020001883A KR 100425320 B1 KR100425320 B1 KR 100425320B1
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- transfer belt
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- transfer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/0058—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a roller or a polygonal rotating cleaning member; Details thereof, e.g. surface structure
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus 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
- G03G15/1605—Apparatus 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
- G03G15/161—Apparatus 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/0026—Cleaning of foreign matter, e.g. paper powder, from imaging member
- G03G2221/0068—Cleaning mechanism
- G03G2221/0089—Mechanical
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
전자사진방식 화상형성기기의 전사벨트 클리닝장치가 개시된다. 개시된 전사벨트 클리닝장치는, 전사벨트의 표면에 밀착되어 회전가능하도록 설치되어 전사벨트의 표면에 잔류하는 현상제를 그 외주면에 부착시키는 클리닝롤러와, 클리닝롤러가 위치하는 전사벨트의 이면에 밀착되어 회전가능하도록 설치되어 클리닝롤러와 함께 전사벨트에 소정 압력을 가하는 클리닝백업롤러와, 클리닝롤러의 외주면에 그 선단부가 접촉되도록 설치되어 클리닝롤러의 외주면에 부착된 현상제를 제거하는 클리닝블레이드를 구비한다. 여기서, 클리닝롤러와 클리닝백업롤러 중 적어도 하나에 소정전압을 인가하여 전사벨트에 잔류하는 현상제가 정전기력에 의하여 클리닝롤러에 부착된다. 따라서, 화상불량을 방지할 수 있고, 화상의 품질을 균일하게 유지할 수 있다.A transfer belt cleaning apparatus of an electrophotographic image forming apparatus is disclosed. The disclosed transfer belt cleaning apparatus is installed to be in close contact with the surface of the transfer belt to be rotatable, and adheres to a rear surface of the transfer belt at which the cleaning roller is located to attach the developer remaining on the surface of the transfer belt to the outer circumferential surface thereof. A cleaning backup roller which is rotatably installed to apply a predetermined pressure to the transfer belt together with the cleaning roller, and a cleaning blade which is installed such that the tip thereof contacts the outer circumferential surface of the cleaning roller and removes the developer attached to the outer circumferential surface of the cleaning roller. . Here, the developer remaining on the transfer belt by applying a predetermined voltage to at least one of the cleaning roller and the cleaning backup roller is attached to the cleaning roller by the electrostatic force. Therefore, image defects can be prevented and the quality of an image can be kept uniform.
Description
본 발명은 전자사진방식 화상형성기기에 관한 것으로, 특히 전사벨트에 잔류하는 현상제를 클리닝하기 위한 전사벨트 클리닝장치에 관한 것이다.The present invention relates to an electrophotographic image forming apparatus, and more particularly, to a transfer belt cleaning apparatus for cleaning a developer remaining on a transfer belt.
일반적으로, 레이저 프린터와 같은 전자사진방식 화상형성기기는 감광드럼 또는 감광벨트와 같은 감광체(OPC:organic photoconductive cell)에 정전잠상을 형성하고, 그 정전잠상을 소정 색상의 토너로 현상하여 용지에 전사시킴으로써 원하는 화상을 얻을 수 있는 기기를 말한다.In general, an electrophotographic image forming apparatus such as a laser printer forms an electrostatic latent image on an optical photoconductive cell (OPC) such as a photosensitive drum or a photosensitive belt, develops the electrostatic latent image with a toner of a predetermined color, and transfers it onto paper. By means of the device that can obtain a desired image.
도 1에는 종래의 습식 칼라 전자사진방식 화상형성기기의 개략적인 구성이 도시되어 있다. 도면을 참조하면, 전자사진방식 화상형성기기는 현상유닛(23a,23b,23c,23d), 전사벨트(10), 전사유닛(30) 등으로 구성되어 있다.1 shows a schematic configuration of a conventional wet color electrophotographic image forming apparatus. Referring to the drawings, the electrophotographic image forming apparatus is composed of a developing unit 23a, 23b, 23c, 23d, a transfer belt 10, a transfer unit 30, and the like.
상기 현상유닛(23a,23b,23c,23d)은 노광유닛(22a,22b,22c,22d)에 의하여 소정의 색상에 대응하는 각 감광체(20a,20b,20c,20d)에 형성된 정전잠상을 원하는 소정의 색상으로 현상하는 것으로, 현상제 카트리지(미도시)로부터 공급된 현상제를 이용하여 각 감광체(20a,20b,20c,20d)에 형성된 정전잠상을 현상한다. 상기 전사벨트(10)는 구동롤러(25), 전사백업롤러(24a,24b,24c,24d) 등에 지지되어 이동하면서 상기 각 감광체(20a,20b,20c,20d)로부터 화상을 전사받아 완성된 칼라 색상의 화상을 형성한다. 전사유닛(30)은 상기 전사벨트(10)의 화상을 용지(P)에 전사하는 것으로, 용지(P)를 전사벨트(10)에 밀착시키는 용지전사롤러(31) 및 용지전사백업롤러(32)를 구비한다. 이때, 전위인가부(33)가 상기 용지전사백업롤러(32)에 전압을 걸어줌으로써 전사벨트(10)에 형성된 화상이 용지(P)쪽으로 잘 전사되도록 전기적인 힘을 가해준다. 참조부호 21a,21b,21c,21d는 각 감광체를 대전시키는 대전기를 나타낸다.The developing units 23a, 23b, 23c, and 23d are configured by the exposure units 22a, 22b, 22c, and 22d to have electrostatic latent images formed on the photosensitive members 20a, 20b, 20c, and 20d corresponding to a predetermined color. By developing in a color of, the electrostatic latent images formed on the photosensitive members 20a, 20b, 20c, and 20d are developed using a developer supplied from a developer cartridge (not shown). The transfer belt 10 is supported by the driving roller 25, the transfer backup rollers 24a, 24b, 24c, 24d and the like while being transferred from the respective photosensitive members 20a, 20b, 20c, and 20d to complete the color. Form an image of color. The transfer unit 30 transfers the image of the transfer belt 10 onto the paper P, and the paper transfer roller 31 and the paper transfer backup roller 32 which adhere the paper P to the transfer belt 10. ). At this time, the potential applying unit 33 applies an electric force so that the image formed on the transfer belt 10 is transferred to the paper P well by applying a voltage to the paper transfer backup roller 32. Reference numerals 21a, 21b, 21c, and 21d denote chargers for charging the respective photosensitive members.
상기의 구성에서, 원하는 칼라화상을 인쇄하기 위해서는, 각 감광체(20a,20b,20c,20d)에 각 색상별로 화상을 현상하여 전사벨트(10) 상의 같은 화상 위치에 중첩되게 찍어서 최종 칼라 화상을 만든 후 이를 전사유닛(30)에서 용지(P)에 인쇄하게 된다.In the above arrangement, in order to print a desired color image, an image is developed for each photosensitive member 20a, 20b, 20c, and 20d for each color to be superimposed on the same image position on the transfer belt 10 to produce a final color image. This is then printed on the paper (P) in the transfer unit (30).
한편, 상기와 같은 구조에서는 상기 용지전사백업롤러(32)에 걸리는 전압에 의한 전기적인 척력에만 의존하여 전사가 이루어지기 때문에, 전사 후에도 전사벨트(10)에 미전사된 현상제가 상당히 잔류하게 된다.On the other hand, in the above structure, since the transfer is performed only depending on the electric repulsive force due to the voltage applied to the paper transfer backup roller 32, the untransferred developer in the transfer belt 10 remains substantially after the transfer.
따라서, 전사벨트(10)에 잔류하는 현상제를 제거하기 위한 전사벨트 클리닝장치가 필요하게 되는데, 상기한 전자사진방식 화상형성기기에서는 전사벨트(10)에 잔류하는 현상제가 전사벨트(10)에 일정압력으로 밀착되도록 설치된 클리닝블레이드(40)에 의하여 제거된 후, 폐토너통(미도시)으로 보내지도록 되어 있다.Therefore, a transfer belt cleaning apparatus for removing the developer remaining on the transfer belt 10 is required. In the electrophotographic image forming apparatus, the developer remaining on the transfer belt 10 is transferred to the transfer belt 10. After being removed by the cleaning blade 40 installed to be in close contact with a predetermined pressure, it is sent to a waste toner box (not shown).
그러나, 상기와 같은 클리닝블레이드(40)를 이용한 전자사진방식 화상형성기기에서는, 클리닝블레이드(40)와의 마찰부하로 인하여 전사벨트(10)의 이송속도가 불균일하게 되고, 전사벨트(10)가 진동하게 되며, 이는 색 부정합(color miss-registration) 등과 같은 화상불량을 유발하는 원인이 된다.However, in the electrophotographic image forming apparatus using the cleaning blade 40 as described above, the transfer speed of the transfer belt 10 becomes uneven due to the friction load with the cleaning blade 40, and the transfer belt 10 vibrates. This may cause image defects such as color miss-registration.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 전사벨트의 표면에 잔류하는 현상제를 정전기력을 이용하여 클리닝롤러에 부착시킴으로써 클리닝성능이 향상되고, 화상의 품질이 균일하게 유지되는 개선된 전자사진방식 화상형성기기의 전사벨트 클리닝장치를 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by improving the cleaning performance by maintaining the quality of the image uniformly by attaching the developer remaining on the surface of the transfer belt to the cleaning roller using the electrostatic force It is an object of the present invention to provide a transfer belt cleaning apparatus for an image forming apparatus.
도 1은 종래의 전자사진방식 화상형성기기의 개략적인 구성을 도시한 도면.1 is a view showing a schematic configuration of a conventional electrophotographic image forming apparatus.
도 2는 본 발명에 따른 전사벨트 클리닝장치를 구비한 전자사진방식 화상형성기기의 개략적인 구성을 도시한 도면.2 is a view showing a schematic configuration of an electrophotographic image forming apparatus having a transfer belt cleaning apparatus according to the present invention;
도 3은 도 2에 도시된 전사벨트 클리닝장치의 사시도.3 is a perspective view of the transfer belt cleaning device shown in FIG.
도 4는 본 발명의 다른 실시예에 따른 전사벨트 클리닝장치의 수직구조를 도시한 단면도.Figure 4 is a cross-sectional view showing a vertical structure of the transfer belt cleaning apparatus according to another embodiment of the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10... 전사벨트 20a,20b,20c,20d... 감광체10 ... Transfer belt 20a, 20b, 20c, 20d ... Photosensitive member
21a,21b,21c,21d... 대전기 22a,22b,22c,22d... 노광유닛21a, 21b, 21c, 21d ... Charger 22a, 22b, 22c, 22d ... Exposure unit
23a,23b,23c,23d... 현상유닛 24a,24b,24c,24d... 전사백업롤러23a, 23b, 23c, 23d ... Developing unit 24a, 24b, 24c, 24d ... Transfer backup roller
25... 구동롤러 30... 전사유닛25 ... drive roller 30 ... transfer unit
31... 용지전사롤러 32... 용지전사백업롤러31. Paper transfer roller 32 ... Paper transfer backup roller
33... 전위인가부 140... 전사벨트 클리닝장치33 ... Potentiometer 140 ... Transfer belt cleaning device
141...클리닝롤러 142... 클리닝백업롤러141 ... cleaning roller 142 ... cleaning backup roller
143... 클리닝블레이드 P... 용지143 ... Cleaning Blade P ... Paper
상기의 목적을 달성하기 위하여 본 발명에 따르면,According to the present invention to achieve the above object,
전사벨트로 전사된 화상이 용지에 전사된 후, 상기 전사벨트의 표면에 잔류하는 현상제를 제거하기 위한 전자사진방식 화상형성기기의 전사벨트 클리닝장치에 있어서,In the transfer belt cleaning apparatus of the electrophotographic image forming apparatus for removing the developer remaining on the surface of the transfer belt after the image transferred by the transfer belt is transferred to the paper,
상기 전사벨트의 표면에 밀착되어 회전가능하도록 설치되어 상기 전사벨트의 표면에 잔류하는 현상제를 그 외주면에 부착시키는 클리닝롤러와; 상기 클리닝롤러가 위치하는 상기 전사벨트의 이면에 밀착되어 회전가능하도록 설치되어 상기 클리닝롤러와 함께 상기 전사벨트에 소정 압력을 가하는 클리닝백업롤러와; 상기 클리닝롤러의 외주면에 그 선단부가 접촉되도록 설치되어, 상기 클리닝롤러의 외주면에 부착된 현상제를 제거하는 클리닝블레이드를; 구비하는 전자사진방식 화상형성기기의 전사벨트 클리닝장치가 개시된다.A cleaning roller which is installed to be in close contact with the surface of the transfer belt and is rotatable and attaches a developer remaining on the surface of the transfer belt to an outer peripheral surface thereof; A cleaning back-up roller which is installed to be in close contact with the rear surface of the transfer belt in which the cleaning roller is located and is rotatable to apply a predetermined pressure to the transfer belt together with the cleaning roller; A cleaning blade installed on the outer circumferential surface of the cleaning roller so as to come into contact with the front end of the cleaning roller to remove a developer attached to the outer circumferential surface of the cleaning roller; Disclosed is a transfer belt cleaning apparatus of an electrophotographic image forming apparatus.
여기서, 상기 클리닝롤러와 상기 클리닝백업롤러 중 적어도 하나에 소정 전압을 인가하여 상기 전사벨트에 잔류하는 현상제가 정전기력에 의하여 상기 클리닝롤러에 부착되는 것을 특징으로 한다. 이때, 상기 클리닝롤러 및 상기 클리닝백업롤러는 도전성 재질의 롤러인 것이 바람직하다.Here, the developer remaining on the transfer belt by applying a predetermined voltage to at least one of the cleaning roller and the cleaning backup roller is attached to the cleaning roller by the electrostatic force. At this time, the cleaning roller and the cleaning backup roller is preferably a roller of a conductive material.
이하, 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시예를 상세히 설명한다. 도면에서 동일한 참조부호는 동일한 요소를 지칭하며, 각 요소는 설명의 명료성을 위하여 편의상 과장되어 도면에 도시되어 있을 수 있다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements, and each element may be exaggerated for clarity and illustrated in the drawings.
도 2는 본 발명에 따른 전사벨트 클리닝장치를 구비한 전자사진방식 화상형성기기의 개략적인 구성을 도시한 도면이다.2 is a diagram showing a schematic configuration of an electrophotographic image forming apparatus having a transfer belt cleaning apparatus according to the present invention.
도면을 참조하면, 전자사진방식 화상형성기기는 옐로우(Y), 마젠타(M), 시안(C), 블랙(K)의 4가지 색상에 대응하도록 준비된 4개의 감광체(20a,20b,20c,20d)와, 상기 각 감광체(20a,20b,20c,20d)를 대전시키는 대전기(21a,21b,21c,21d)와, 상기 각 감광체(20a,20b,20c,20d)에 광을 주사하여 원하는 화상의 정전잠상을 형성하는 노광유닛(22a,22b,22c,22d)과, 상기 정전잠상을 각 색상별 현상제로 현상하는 현상유닛(23a,23b,23c,23d)과, 구동롤러(25) 및 전사백업롤러(24a,24b,24c,24d)에 지지되어 이동하면서 상기 각 감광체(20a,20b,20c,20d)에 현상된 화상을 순차적으로 중첩되게 전사받아 완성된 칼라 색상의 화상을 형성하게 되는 전사벨트(10)와, 상기 전사벨트(10)의 화상을 용지(P)로 전사하는 전사유닛(30)을 구비한다. 따라서, 원하는 칼라 화상을 인쇄하기 위해서는, 상기 4개의 감광체(20a,20b,20c,20d)에 각 색상별로 화상을 현상하여 전사벨트(10) 상의 같은 화상 위치에 중첩되게 찍어서 최종 칼라 화상을 만든 후 이를 전사유닛(30)에서 용지(P)에 인쇄하게 된다.Referring to the drawings, an electrophotographic image forming apparatus includes four photosensitive members 20a, 20b, 20c, and 20d prepared to correspond to four colors of yellow (Y), magenta (M), cyan (C), and black (K). ), A charger 21a, 21b, 21c, 21d for charging the respective photosensitive members 20a, 20b, 20c, and 20d, and a desired image by scanning light to the photosensitive members 20a, 20b, 20c, and 20d. Exposure units 22a, 22b, 22c, and 22d for forming a latent electrostatic image, a developing unit 23a, 23b, 23c, and 23d for developing the electrostatic latent image with a developer for each color, a drive roller 25, and a transfer. The transfer roller is supported by the backup rollers 24a, 24b, 24c, and 24d while being transferred to each of the photosensitive members 20a, 20b, 20c, and 20d sequentially so that the images of the completed color are formed. A belt 10 and a transfer unit 30 for transferring the image of the transfer belt 10 onto the paper P are provided. Therefore, in order to print a desired color image, the image is developed for each of the four photoconductors 20a, 20b, 20c, and 20d for each color to be superimposed on the same image position on the transfer belt 10 to produce a final color image. This is printed on the paper (P) in the transfer unit (30).
여기서, 상기 전사유닛(30)은 용지(P)를 전사벨트(10)에 밀착시키는 용지전사롤러(31) 및 용지전사백업롤러(32)를 구비한다. 이때 전위인가부(33)가 상기 용지전사백업롤러(32)에 전압을 걸어줌으로써 전사벨트(10)에 형성된 화상이 용지(P) 쪽으로 잘 전사되도록 전기적인 힘을 가해준다. 여기서는 화상 형성에 사용되는 현상제의 주성분인 토너가 양전하를 띄고 있는 경우를 예시한 것으로, 전위인가부(33)도 용지전사백업롤러(32)에 양전압을 걸어서 전기적인 척력에 의해 화상이 용지(P)쪽으로 잘 전사되도록 하고 있다. 즉, 감광체(20a,20b,20c,20d)에 현상된 화상을 전사벨트(10)에 전사할 때에는 해당 감광체(20a,20b,20c,20d)의 전사백업롤러(24a,24b,24c,24d)에 음전압을 걸어서 전기적인 인력에 의해 양전하를 띈 토너 화상이 전사벨트(10)로 잘 전사되게 하고, 그것을 다시 용지(P)에 전사할 때에는 용지전사백업롤러(32)에 양전압을 걸어서 척력에 의해 토너 화상이 전사벨트(10)로부터 용지(P)에 잘 전사되게 하는 것이다.Here, the transfer unit 30 is provided with a paper transfer roller 31 and a paper transfer backup roller 32 for bringing the paper P into close contact with the transfer belt 10. At this time, the potential applying unit 33 applies an electric force so that the image formed on the transfer belt 10 is transferred to the paper P well by applying a voltage to the paper transfer backup roller 32. In this case, the toner, which is a main component of the developer used for forming the image, has a positive charge. The potential applying unit 33 also applies a positive voltage to the paper transfer back-up roller 32, and the image is printed by electrical repulsive force. It is to be transferred to (P) well. That is, when transferring the image developed on the photoconductors 20a, 20b, 20c, 20d to the transfer belt 10, the transfer backup rollers 24a, 24b, 24c, 24d of the photoconductors 20a, 20b, 20c, 20d. A negative voltage was applied to the toner image, which was positively charged by the electric force, to be transferred to the transfer belt 10 well, and when it was transferred to the paper P again, a positive voltage was applied to the paper transfer backup roller 32 to repulse. This allows the toner image to be transferred from the transfer belt 10 to the paper P well.
한편, 본 발명에 따른 전자사진방식 화상형성기기는 전사벨트(10)로 전사된 화상이 용지(P)에 전사된 후, 상기 전사벨트(10)의 표면에 잔류하는 현상제를 제거하기 위한 전사벨트 클리닝장치(140)를 구비한다.On the other hand, in the electrophotographic image forming apparatus according to the present invention, after the image transferred to the transfer belt 10 is transferred to the paper P, the transfer for removing the developer remaining on the surface of the transfer belt 10 The belt cleaning device 140 is provided.
도 3은 본 발명에 따른 전사벨트 클리닝장치(140)의 사시도이다.3 is a perspective view of a transfer belt cleaning device 140 according to the present invention.
도면을 참조하면, 전사벨트 클리닝장치는 클리닝롤러(141), 클리닝백업롤러(142) 및 클리닝블레이드(143)를 구비한다.Referring to the drawings, the transfer belt cleaning apparatus includes a cleaning roller 141, a cleaning backup roller 142, and a cleaning blade 143.
클리닝롤러(141)는 전사벨트(10)의 표면에 잔류하는 현상제를 그 외주면에 부착시키기 위하여 상기 전사벨트(10)의 표면에 밀착되어 회전가능하도록 설치되어 있으며, 클리닝백업롤러(142)는 상기 클리닝롤러(141)와 함께 전사벨트(10)에 일정한 압력을 가할 수 있도록 클리닝롤러(141)가 위치하는 전사벨트(10)의 이면에 밀착되어 회전가능하도록 설치되어 있다. 여기서, 상기 클리닝롤러(141) 및 클리닝백업롤러(142)는 전사벨트(10)의 이동에 의하여 회전되며, 회전을 용이하게 하기 위하여 축상에 베어링(미도시)이 장착되어 있다. 클리닝블레이드(143)는 클리닝롤러(141)의 외주면에 부착된 현상제를 제거하기 위하여 클리닝롤러(141)의 외주면에 그 선단부가 접촉하도록 설치되어 있다.The cleaning roller 141 is rotatably attached to the surface of the transfer belt 10 in order to attach the developer remaining on the surface of the transfer belt 10 to the outer peripheral surface thereof, and the cleaning backup roller 142 is installed. The cleaning roller 141 is installed to be in close contact with the rear surface of the transfer belt 10 in which the cleaning roller 141 is positioned so as to apply a predetermined pressure to the transfer belt 10. Here, the cleaning roller 141 and the cleaning backup roller 142 is rotated by the movement of the transfer belt 10, the bearing (not shown) is mounted on the shaft to facilitate the rotation. The cleaning blade 143 is provided such that the tip thereof contacts the outer circumferential surface of the cleaning roller 141 to remove the developer adhered to the outer circumferential surface of the cleaning roller 141.
한편, 상기 클리닝롤러(141) 및 클리닝백업롤러(142)는 정전식 롤러로서, 현상제의 주성분인 토너가 양전하를 띄고 있는 경우에는 상기 클리닝롤러(141)에는 소정의 음전압이 인가되어 있으며, 이에 대응하여 상기 클리닝백업롤러(142)는 접지되어 있다. 여기서, 상기 클리닝롤러(141) 및 클리닝백업롤러(142)는 전압을 인가할 수 있도록 금속 또는 도전성 고무와 같은 도전성 재질로 이루어져 있다.Meanwhile, the cleaning roller 141 and the cleaning backup roller 142 are electrostatic rollers. When the toner which is the main component of the developer has a positive charge, a predetermined negative voltage is applied to the cleaning roller 141. Correspondingly, the cleaning backup roller 142 is grounded. Here, the cleaning roller 141 and the cleaning backup roller 142 is made of a conductive material such as metal or conductive rubber to apply a voltage.
상기와 같은 구성에서, 화상이 용지에 전사된 후, 전사벨트(10)가 회전하는 한 쌍의 클리닝롤러(141) 및 클리닝백업롤러(142)를 통과하게 되면, 전사벨트(10)의 표면에 잔류하는 현상제는 그 주성분인 토너가 양전하를 띄고 있으므로 음전압이 인가된 클리닝롤러(141) 쪽으로 정전기력을 받아 이동하게 된다. 이에 따라 전사벨트(10)의 표면에 잔류하는 현상제는 회전하는 클리닝롤러(141)의 외주면에 부착된다. 한편, 클리닝롤러(141)의 외주면에 부착된 현상제는 클리닝블레이드(143)에 의해 제거된 후, 폐토너통(미도시)으로 이송된다.In the above configuration, after the image is transferred onto the paper, the transfer belt 10 passes through the pair of cleaning rollers 141 and the cleaning backup rollers 142, which rotate on the surface of the transfer belt 10. The remaining developer is positively charged because the toner, which is a main component thereof, is moved by the electrostatic force toward the cleaning roller 141 to which a negative voltage is applied. Accordingly, the developer remaining on the surface of the transfer belt 10 is attached to the outer circumferential surface of the rotating cleaning roller 141. Meanwhile, the developer attached to the outer circumferential surface of the cleaning roller 141 is removed by the cleaning blade 143 and then transferred to a waste toner box (not shown).
도 4는 본 발명에 따른 전사벨트 클리닝장치의 다른 실시예를 보여준다. 도면을 참조하면, 클리닝백업롤러(142)에는 소정의 양전압이 인가되어 있는 한편, 클리닝롤러(141)는 접지되어 있다. 전사벨트(10)가 상기 클리닝롤러(141) 및 클리닝백업롤러(142)를 통과하게 되면, 전사벨트(10)의 표면에 잔류하는 현상제는 그 주성분인 토너가 양전하를 띄고 있으므로 양전압이 인가된 클리닝백업롤러(142)와는 척력이 작용하여 클리닝롤러(141) 쪽으로 이동하게 된다. 이에 따라 전사벨트(10)의 표면에 잔류하는 현상제는 회전하는 클리닝롤러(141)의 외주면에 부착되고, 부착된 현상제는 클리닝블레이드(143)에 의해 제거된다.Figure 4 shows another embodiment of the transfer belt cleaning apparatus according to the present invention. Referring to the figure, a predetermined positive voltage is applied to the cleaning backup roller 142, while the cleaning roller 141 is grounded. When the transfer belt 10 passes through the cleaning roller 141 and the cleaning backup roller 142, the developer remaining on the surface of the transfer belt 10 is positively charged because the toner which is a main component thereof has a positive charge. Repulsive force is applied to the cleaning backup roller 142 thus moved toward the cleaning roller 141. Accordingly, the developer remaining on the surface of the transfer belt 10 is attached to the outer circumferential surface of the rotating cleaning roller 141, and the attached developer is removed by the cleaning blade 143.
이상에서는, 현상제의 주성분인 토너가 양전하를 띄고 있는 경우에만 설명되었으나, 토너가 음전하를 띄고 있는 경우에도 적용될 수 있으며, 이 경우에는 인가되는 전압의 부호가 반대가 된다.In the above description, only the case where the toner, which is the main component of the developer, has a positive charge is described, but it can be applied even when the toner has a negative charge, in which case the sign of the applied voltage is reversed.
이상에서 설명한 바와 같이, 본 발명에 따른 전사벨트 클리닝장치는 한 쌍의 정전식롤러인 클리닝롤러와 클리닝백업롤러를 사용하여 전사벨트 클리닝시 전사벨트의 이송속도를 균일하게 함으로써 화질의 불량을 방지할 수 있는 한편, 연속적으로 프린팅시 화상의 품질을 균일하게 유지할 수 있다.As described above, the transfer belt cleaning apparatus according to the present invention uses a pair of electrostatic rollers, a cleaning roller and a cleaning backup roller, to uniformly prevent the transfer of the transfer belt during cleaning of the transfer belt, thereby preventing image quality defects. On the other hand, the quality of the image can be kept uniform during continuous printing.
본 발명은 도면에 도시된 일 실시예를 참고로 하여 설명되었으나 이는 예시적인 것에 불과하며 당해 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 실시예의 변형이 가능하다는 점을 이해할 것이다.Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and variations can be made therefrom.
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