KR19990020320A - Charging device of electrophotographic process - Google Patents
Charging device of electrophotographic process Download PDFInfo
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- KR19990020320A KR19990020320A KR1019970043780A KR19970043780A KR19990020320A KR 19990020320 A KR19990020320 A KR 19990020320A KR 1019970043780 A KR1019970043780 A KR 1019970043780A KR 19970043780 A KR19970043780 A KR 19970043780A KR 19990020320 A KR19990020320 A KR 19990020320A
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- photosensitive drum
- roller
- toner
- charging
- charging roller
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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
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
- G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
- G03G15/0225—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers provided with means for cleaning the charging member
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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
- G03G21/0011—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 blade; Details of cleaning blades, e.g. blade shape, layer forming
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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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
1. 청구범위에 기재된 발명이 속한 기술분야.1. The technical field to which the invention described in the claims belongs.
본 발명은 전자사진 프로세스의 대전장치에 관한것이다.The present invention relates to a charging device for an electrophotographic process.
2. 발명이 해결하려고 하는 기술적 과제2. The technical problem to be solved by the invention
본 발명은 전자사진 프로세스의 대전롤러를 감광드럼 회전방향과 동일하게 회전될수 있도록 설치하여 감광드럼의 잔류토너를 대전롤러로 닦아주며 회수할 수 있도록 하여 대전을 균일하게 할 수 있도록 한 전자프로세스의 대전장치를 제공함에 있다.The present invention installs the charging roller of the electrophotographic process so that it can be rotated in the same direction as the rotation direction of the photosensitive drum, so that the remaining toner of the photosensitive drum can be wiped and recovered by the charging roller so that the charging of the electronic process can be made uniform. In providing a device.
3. 발명의 해결방법의 요지.3. Summary of the Solution of the Invention.
본 발명은 잔자사진 프로세스에 있어서, 일정한 주속으로 회전하는 감광드럼과, 상기 감광드럼의 표면에 전기적으로 전하층을 균일하게 대전시키는 대전롤러와 동일한 회전방향으로 회전될 수 있도록 설치하여 대전롤러로 감광드럼상의 잔류토너를 닦아주며 현상부로 회수될 수 있도록 하여 대전을 균일하게 하며 화상 국부 오염등을 방지할 수 있도록 함을 특징으로 한다.The present invention provides a photosensitive drum which rotates at a constant circumferential speed, and is installed to be rotated in the same rotational direction as a charging roller that electrically charges an electric charge layer uniformly on the surface of the photosensitive drum. It cleans the residual toner on the drum and allows it to be recovered to the developing part so as to uniformly charge and prevent burns and local contamination.
4. 발명의 중요한 용도.4. Important uses of the invention.
본 발명은 전자사진 프로세스의 대전장치.The present invention is a charging device of the electrophotographic process.
Description
본 발명은 레이저 빔 프린터, 복사기, 일반용지 팩시밀리등의 전자사진 프로세스의 화상형성장치에 관한 것으로서, 특히 감광드럼의 상측에 설치된 대전롤러를 감광드럼과 동일항 방향으로 회전될 수 있도록 설치하여 감광드럼상의 잔류토너를 닦아내며 대전을 균일하게 할 수 있도록 한 전자사진 프러세스의 대전장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus of an electrophotographic process such as a laser beam printer, a copying machine, a plain paper facsimile, and the like. The present invention relates to a charging device for an electrophotographic process that wipes out residual toner on the phase and makes charging uniform.
화상형성장치에는 전자사진 현상방식이 가장널리 사용되고 있으며, 통상적인 전자사진 현상방식을 이용한 화상형성장치는 복사기, 레이저 빔 프린터, 일반용지 팩시밀리등과 같은 기록장치가 있다. 이미 널리 알려진 바와 같이 전자사진 방식을 이용한 화상형성장치는 감광드럼의 표면에 대전롤러로 전하를 대전시키며 눈에 보이지 않는 정전잠상을 형성한다. 그리고, 상기와 같은 정전잠상이 형성된 감광드럼의 표면에 토너로 화상을 형성하여 가시화 시키고, 이를 용지에 전사하여 기록한다.BACKGROUND OF THE INVENTION An electrophotographic developing method is most widely used for an image forming apparatus, and an image forming apparatus using a conventional electrophotographic developing method includes a recording apparatus such as a copying machine, a laser beam printer, a general paper fax machine, and the like. As is well known, an image forming apparatus using an electrophotographic method charges an electric charge with a charging roller on the surface of a photosensitive drum and forms an invisible electrostatic latent image. Then, an image is formed on the surface of the photosensitive drum on which the electrostatic latent image is formed as a toner to visualize the image, which is transferred onto a sheet of paper and recorded.
상기와 같은 화상형성장치는 종래에 제1도와 같이 전자사진 프로세서의 화상형성장치(1)는 일정한 주속으로 시계방향으로 회전하는 감광드럼(2)과, 상기 감광드럼(2)의 상단부에는 표면에 전기적으로 전하층을 균일하게 대전시키는 대전롤러(3)가 반시계방향으로 회전되게 설치한다. 전기적으로 대전된 상기 감광드럼(2) 표면에 정전 잠상을 형성시키는 노광부(4)가 설치되며, 상기 감광드럼(2)의 하단부에는 상기 감광드럼(2) 표면의 토너(11) 화상을 용지(12)상에 전사시키는 전사롤러(5)가 반시계방향으로 회전되게 설치한다. 상기 감광드럼(2)의 일측은 토너로 화상을 형성시키는 현상롤러(6)가 반시계방향으로 회전되게 설치한다. 상기 현상롤러(6) 일측에는 토너(11)를 현상롤러(6)로 공급하는 공급롤러(7)를 반시계방향으로 회전되게 설치한다. 상기 공급롤러(7)의 상단부에는 토너(11)를 저장하는 토너적재부(10)가 형성되며, 상기 토너적재부(10)의 중심부에는 상기 토너(11)를 전기적으로 균일하게 교반시키는 에지테이(8)가 반시계방향으로 회전되게 설치한다. 상기 현상롤러(6)의 상단부에는 상기 현상롤러(26) 표면에 형성된 토너(11)를 일정한 높이로 균일하게 규제하는 도전성 고무인 블레이드(19)가 설치된 것이다.In the image forming apparatus as described above, the image forming apparatus 1 of the electrophotographic processor has a photosensitive drum 2 which rotates in a clockwise direction at a constant circumferential speed as shown in FIG. The charging roller 3, which electrically charges the charge layer uniformly, is installed so as to rotate counterclockwise. An exposure unit 4 is formed on the surface of the photosensitive drum 2 that is electrically charged, and an image of the toner 11 on the surface of the photosensitive drum 2 is formed on the lower end of the photosensitive drum 2. The transfer roller 5 to be transferred onto (12) is installed to rotate counterclockwise. One side of the photosensitive drum 2 is installed so that the developing roller 6 for forming an image with toner is rotated counterclockwise. On one side of the developing roller 6, a supply roller 7 for supplying the toner 11 to the developing roller 6 is installed to rotate counterclockwise. An upper end portion of the feed roller 7 is formed with a toner loading portion 10 for storing the toner 11, and an edge tape for electrically and uniformly stirring the toner 11 at the center of the toner loading portion 10. Install so that (8) rotates counterclockwise. At the upper end of the developing roller 6, a blade 19, which is a conductive rubber for uniformly regulating the toner 11 formed on the surface of the developing roller 26 to a predetermined height, is installed.
상기와 같이 구성된 전자사진 프로세서의 화상 형성 장치(1) 상단부에 형성된 토너적재부(10)에 토너(11)가 공급되어지면, 상기 토너(11)는 에지테이터(8)에 의해 교반되어져 마찰에 의한 정전기를 발생하게 되어 일정 전하를 가지게 된다. 상기 토너(11)는 하측의 공급롤러(7)가 반시계방향으로 회전되면서 현상롤러(6) 측으로 공급되어 진다. 상기 현상롤러(6)가 반시계방향으로 회전되면서 표면에 형성된 토너(11)는 블레이드(9)에 의해 일정한 높이로 균일하게 규제되어 진다.When the toner 11 is supplied to the toner loading portion 10 formed at the upper end of the image forming apparatus 1 of the electrophotographic processor configured as described above, the toner 11 is agitated by the edge data 8 to prevent friction. The static electricity is generated and thus has a constant charge. The toner 11 is supplied to the developing roller 6 side while the lower feed roller 7 rotates counterclockwise. As the developing roller 6 is rotated counterclockwise, the toner 11 formed on the surface is uniformly regulated to a certain height by the blade 9.
이때, 대전롤러(3)가 반시계방향으로 회전되면서 전기적 작용에 의해 감광드럼(2)의 표면을 전기적으로 균일하게 대전하고, 상기 감광드럼(2)이 시계방향으로 회전되며 대전된 부분은 노광부(4)를 통해 화상을 형성하기 위한 전기적 신호를 받아 상기 감광드럼(2) 표면을 노광시키면 초기 대전된 상태에서 빛을 받은 부분은 정전잠상이 형성하게 된다. 이때 상기 감광드럼(2)의 정전잠상이 반시계방향으로 회전되는 현상롤러(6)를 지나는 동안 토너(11)로 현상되어 가시상으로 변하게 된다. 이어서 급지카세트에 장착된 기록용지(2)가 급지롤러에 의해 급지되어 반시계방향으로 회전되는 전사롤러(5)의 고압작용으로 상기 감광드럼(2) 표면의 토너(11) 화상을 기록용지(12)로 전사되게 한다.At this time, as the charging roller 3 rotates counterclockwise, the surface of the photosensitive drum 2 is electrically uniformly charged by electric action, and the photosensitive drum 2 is rotated clockwise and the charged portion When the surface of the photosensitive drum 2 is exposed by receiving an electrical signal for forming an image through the light portion 4, an electrostatic latent image is formed in a portion that receives light in an initial charged state. At this time, while the electrostatic latent image of the photosensitive drum 2 passes through the developing roller 6 which is rotated counterclockwise, it is developed with the toner 11 and becomes a visible image. Subsequently, the recording paper 2 mounted on the paper feed cassette is fed by the paper feed roller, and the toner 11 image on the surface of the photosensitive drum 2 is recorded by the high pressure action of the transfer roller 5 which is rotated counterclockwise. 12) to be transferred.
그후, 상기 기록용지(12)는 이송되어져 정착부의 히팅롤러와 압착롤러 사이를 통과하면 열과 압력에 의해 기록용지(12)면에 상이 정착되어 인쇄된 용지가 배지트레이 측으로 이송되어 원하는 인쇄가 이루어진다.Thereafter, the recording paper 12 is conveyed and passed between the heating roller and the pressing roller of the fixing unit, and then the image is fixed on the surface of the recording paper 12 by heat and pressure, and the printed paper is transported to the discharge tray side to achieve desired printing.
그러나 이러한 종래의 화상형성장치는 감광드럼의 상부에 설치된 대전롤러가 감광드럼과 서로 반대방향으로 회전하면서 고압으로 감광드럼 표면을 골고루 대전시킬 때 감광드럼상의 토너는 100% 기록용지에 전사되지 못하므로 감광드럼상에 남아 있는 토너가 대전롤러에 정전기적인 힘과, 기계적인 부착력으로 대전롤러에 붙어서 대전롤러를 오염시킨다. 이때 대전롤러가 오염이 되면 대전특성이 저하되고 감광드럼의 표면전위를 충분히 형성시켜주지 못하고 표면전위가 충분히 형성되지 않으면 현상부에서 토너가 현상되어 화상에 나타나게 되어 화상농도를 균일하게 할 수 없는 문제점이 발생되었다.However, in the conventional image forming apparatus, when the charging roller installed on the photosensitive drum rotates in the opposite direction to the photosensitive drum and evenly charges the photosensitive drum surface at high pressure, the toner on the photosensitive drum is not transferred to 100% recording paper. The toner remaining on the photosensitive drum adheres to the charging roller by the electrostatic force and the mechanical adhesion to the charging roller and contaminates the charging roller. At this time, if the charging roller is contaminated, the charging characteristics are deteriorated. If the surface potential of the photosensitive drum is not sufficiently formed, and the surface potential is not sufficiently formed, the toner is developed in the developing unit and appears in the image, thereby making it impossible to uniformize the image density. This occurred.
본 발명의 목적은 화상형성장치에서 감광드럼상에 설치된 대전롤러를 감광드럼과 동일한 방향으로 회전되게 설치하여 감광드럼의 잔류토너를 대전롤러로 닦아주며 회수할 수 있도록 하여 대전을 균일하게 할 수 있도록 한 전자프로세스의 대전장치를 제공함에 있다.An object of the present invention is to install a charging roller installed on the photosensitive drum in the same direction as the photosensitive drum in the image forming apparatus to wipe the residual toner of the photosensitive drum with the charging roller to recover the uniformity of the charging An electronic process charging device is provided.
본 발명의 다른 목적은 화상형성장치에서 감광드럼과 상측에 설치된 대전롤러의 회전방향을 동일하게 설치하여 대전롤러의 오염을 방지하며 대전을 균일하게 하고 화상농도를 균일하게 할 수 있도록 한 전자사진 프로세스의 대전장치를 제공함에 있다.Another object of the present invention is to install the same direction of rotation of the photosensitive drum and the charging roller installed on the upper side in the image forming apparatus to prevent contamination of the charging roller, to make the charging uniform and to make the image density uniform The present invention provides a charging device.
상기와 같은 목적을 달성하기 위한 본 발명은 전자사진 현상방식을 이용한 화상형성장치에 있어서, 일정한 주속으로 회전하는 감광드럼과, 상기 감광드럼의 표면에 전기적으로 전하층을 균일하게 대전시키는 대전롤러와 동일한 회전방향으로 회전될 수 있도록 설치하여 대전롤러로 감광드럼상의 잔류토너를 닦아주며 현상부로 회수될 수 있도록 하여 대전을 균일하게 하며 화상 오염등을 방지할 수 있도록 함을 특징으로 한다.According to an aspect of the present invention, there is provided an image forming apparatus using an electrophotographic development method, comprising: a photosensitive drum rotating at a constant circumferential speed, and a charging roller for uniformly charging an electric charge layer on a surface of the photosensitive drum; It is installed to be rotated in the same direction of rotation to wipe the residual toner on the photosensitive drum with a charging roller and to be recovered to the developing unit to uniform the charging and to prevent image contamination.
도 1은 종래의 전자사진 프로세스의 화상형성장치의 개략적인 구성도,1 is a schematic configuration diagram of an image forming apparatus of a conventional electrophotographic process;
도 2는 본 발명의 화상형성장치에서 감광드럼상의 대전롤러가 설치된 구성도.2 is a configuration diagram in which a charging roller on a photosensitive drum is installed in the image forming apparatus of the present invention.
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
21: 화상형성장치 22: 감광드럼21: image forming apparatus 22: photosensitive drum
23: 대전롤러 24: 노광부23: charging roller 24: exposed portion
25: 전사롤러 26: 현상롤러25: transfer roller 26: developing roller
31: 토너 32: 용지31: toner 32: paper
이하 본 발명에 따른 실시예를 첨부된 도면에 의거 상세히 설명되어 질 것이다. 도 2는 본 발명의 화상형성장치에서 감광드럼상의 대전롤러가 설치된 구성도로서, 이를 참조하여 본 발명에 따른 화상형성장치 구성을 설명하면 하기와 같다.Embodiments according to the present invention will now be described in detail with reference to the accompanying drawings. 2 is a configuration diagram in which a charging roller on a photosensitive drum is installed in the image forming apparatus according to the present invention.
전자사진 프로세스의 화상형성장치(21)는 일정한 주속으로 시계방향으로 회전하는 감광드럼(22)과, 상기 감광드럼(22)의 상단부에는 표면에 전기적으로 전하층을 균일하게 대전시키는 대전롤러(23)가 시계방향으로 회전되게 설치한다. 전기적으로 대전된 상기 감광드럼(22) 표면에 정전 잠상을 형성시키는 노광부(24)를 설치한다. 상기 감광드럼(22)의 하단부에는 상기 감광드럼(22) 표면의 토너(31) 화상을 용지(32)상에 전사시키는 전사롤러(25)가 반시계방향으로 회전되게 설치한다. 상기 감광드럼(22)의 일측은 토너로 화상을 형성시키는 현상롤러(26)가 반시계방향으로 회전되게 설치되며, 상기 현상롤러(26) 일측에는 토너(31)를 현상롤러(26)로 공급하는 공급롤러(27) 반시계방향으로 회전되게 설치한다. 상기 공급롤러(27)의 상단부에는 토너(31)를 저장하는 토너적재부(30)가 형성되며, 상기 토너적재부(30)의 중심부에는 상기 토너(31)를 전기적으로 균일하게 교반시키는 에지테이(28)가 반시계방향으로 회전되게 설치한다. 상기 현상롤러(26)의 상단부에는 상기 현상롤러(26) 표면에 형성된 토너(31)를 일정한 높이로 균일하게 규제하는 도전성 고무인 블레이드(29)가 설치된 것이다.The image forming apparatus 21 of the electrophotographic process includes a photosensitive drum 22 rotating clockwise at a constant circumferential speed, and a charging roller 23 for uniformly charging an electric charge layer on the upper surface of the photosensitive drum 22. ) Is rotated clockwise. An exposed portion 24 is formed on the surface of the electrically charged photosensitive drum 22 to form an electrostatic latent image. At the lower end of the photosensitive drum 22, a transfer roller 25 for transferring the image of the toner 31 on the surface of the photosensitive drum 22 onto the paper 32 is installed to rotate counterclockwise. One side of the photosensitive drum 22 is installed so that the developing roller 26 for forming an image with toner is rotated counterclockwise, and one side of the developing roller 26 is supplied with the toner 31 to the developing roller 26. The supply roller 27 is installed to rotate in a counterclockwise direction. An upper end portion of the feed roller 27 is formed with a toner loading portion 30 for storing the toner 31, and an edge tape for electrically and uniformly stirring the toner 31 at the center of the toner loading portion 30. Install so that (28) rotates counterclockwise. At the upper end of the developing roller 26, a blade 29, which is a conductive rubber that uniformly regulates the toner 31 formed on the surface of the developing roller 26 to a predetermined height, is installed.
상기와 같이 감광드럼(22)과 대전롤러(23)를 동일한 방향으로 회전되게 설치하여 감광드럼(22)상의 토너를 전사롤러(25)에 의해 기록용지(32)로 전사하고 감광드럼(22)상에 잔류된 토너는 시계방향으로 회전되는 상기 대전롤러(23)로 닦아주며 감광드럼(22) 표면전위를 충분히 균일하게 형성시켜준다. 이때 대전롤러(23)상의 잔류토너는 시계방향으로 회전되는 감광드럼(22)에 묻혀서 보냄으로써 현상부에서 회수되게 하여 대전롤러(23)상에 토너가 쌓여서 대전 불균일을 야기시키는 일이 없도록 한다.As described above, the photosensitive drum 22 and the charging roller 23 are installed to rotate in the same direction, so that the toner on the photosensitive drum 22 is transferred to the recording paper 32 by the transfer roller 25 and the photosensitive drum 22 is used. The toner remaining on the surface is wiped by the charging roller 23 which is rotated in the clockwise direction, and the surface potential of the photosensitive drum 22 is sufficiently evenly formed. At this time, the remaining toner on the charging roller 23 is buried in the photosensitive drum 22 which is rotated in the clockwise direction to be recovered from the developing unit so that the toner is accumulated on the charging roller 23 so as not to cause charging unevenness.
상기와 같은 전자사진 현상방식을 이용한 화상 형성 장치(21)는 토너적재부(30)에 토너(31)가 공급되어지면, 상기 토너(31)는 에지테이터(28)에 의해 교반되어져 마찰에 의한 정전기를 발생하게 되어 일정 전하를 가지게 된다. 상기 토너(31)는 하측의 공급롤러(27)가 반시계방향으로 회전되면서 현상롤러(26) 측으로 공급되어 진다. 상기 현상롤러(26) 반시계방향으로 회전되면서 표면에 형성된 토너(31)는 블레이드(29)에 의해 일정한 높이로 균일하게 규제되어 진다.In the image forming apparatus 21 using the electrophotographic developing method as described above, when the toner 31 is supplied to the toner loading part 30, the toner 31 is agitated by the edge data 28 to cause friction. It generates static electricity and thus has a constant charge. The toner 31 is supplied to the developing roller 26 side while the lower feed roller 27 is rotated counterclockwise. The toner 31 formed on the surface while being rotated counterclockwise to the developing roller 26 is uniformly regulated to a certain height by the blade 29.
이때, 대전롤러(23)가 감광드럼(22)과 동일하게 시계방향으로 회전되면서 전기적 작용에 의해 감광드럼(22)의 표면을 전기적으로 균일하게 대전하고, 이때 감광드럼(22)도 시계방향으로 회전되며 대전된 부분은 노광부(24)를 통해 화상을 형성하기 위한 전기적 신호를 받아 상기 감광드럼(22) 표면을 노광시키면 초기 대전된 상태에서 빛을 받은 부분은 정전잠상이 형성하게 된다. 이후 상기 감광드럼(22)이 시계방향으로 회전되면서 정전잠상에는 반시계방향으로 회전되는 현상롤러(26)를 지나는 동안 (-)대전 토너(31)로 현상이 되어 가시상으로 변하게 된다. 이어서 급지카세트에 장착된 기록용지(32)가 급지롤러에 의해 급지되어 반시계방향으로 회전되는 전사롤러(25)의 (+)전압의 고압작용으로 상기 감광드럼(22) 표면의 토너(31) 화상은 대부분 기록용지(32)로 전사된다.At this time, while the charging roller 23 is rotated in the clockwise direction in the same manner as the photosensitive drum 22, the surface of the photosensitive drum 22 is electrically uniformly charged by electric action, and the photosensitive drum 22 is also clockwise. The rotated and charged part receives an electrical signal for forming an image through the exposure part 24 and exposes the surface of the photosensitive drum 22 so that the electrostatic latent image is formed in the part that receives the light in the initial charged state. Thereafter, while the photosensitive drum 22 is rotated in the clockwise direction, the electrostatic latent image is developed into the negatively charged toner 31 while passing through the developing roller 26 which is rotated counterclockwise. Subsequently, the toner 31 on the surface of the photosensitive drum 22 is operated by the high pressure of the positive voltage of the transfer roller 25 which is loaded by the paper feed roller and rotated counterclockwise. Most of the image is transferred onto the recording paper 32.
이때 감광드럼(22)상에 남은 토너는 전사롤러(25)에 인가된 (+)전압에 의해 (+)대전된 상태로 이동되어 대전롤러(23)와 감광드럼(22)사이에 형성된 닙(NIP)의 진입부에서 (-)전압이 인가된 대전롤러(23)에 정전기적인 힘과 감광드럼(22)과 동일방향으로 회전하는 대전롤러(23) 표면의 기계적인 힘에 의하여 잔류토너는 대전롤러(23)로 옮겨 붙게된다. 상기 대전롤러(23)는 감광드럼(22)사이에 형성된 닙부에서는 토너가 없게되어 감광드럼(22)과 동일방향으로 회전되며 감광드럼(22)표면에 대전시킨다. 이후, 회전되는 대전롤러(23)상의 잔류토너는 시계방향으로 회전되는 감광드럼(22)에 묻혀서 보냄으로써 현상부에서 회수되게 하여 대전롤러(23)의 오염을 방지하여 화상을 균일하게 형성한다.At this time, the toner remaining on the photosensitive drum 22 is moved to the positively charged state by the (+) voltage applied to the transfer roller 25 to form a nip formed between the charging roller 23 and the photosensitive drum 22 ( The remaining toner is charged by the electrostatic force and mechanical force on the surface of the charging roller 23 which rotates in the same direction as the photosensitive drum 22 to the charging roller 23 to which the negative voltage is applied at the entrance of the NIP. It is transferred to the roller 23. The charging roller 23 is free from toner in the nip formed between the photosensitive drums 22 and rotates in the same direction as the photosensitive drums 22 to charge the surface of the photosensitive drums 22. Thereafter, the remaining toner on the rotating charging roller 23 is buried in the photosensitive drum 22 which is rotated in a clockwise direction to be recovered from the developing unit, thereby preventing contamination of the charging roller 23, thereby forming an image uniformly.
그후, 상기 기록용지(32)는 이송되어져 정착부의 히팅롤러와 압착롤러 사이를 통과하면 열과 압력에 의해 기록용지(32)면에 상(image)이 정착되어 인쇄된 용지가 배지트레이 측으로 이송되어 깨끗하고 선명한 화상을 얻은 인쇄가 이루어진다.After that, the recording paper 32 is conveyed and passes between the heating roller and the pressing roller of the fixing unit, so that an image is fixed on the surface of the recording paper 32 by heat and pressure, and the printed paper is transported to the discharge tray side. Printing is achieved with a clear image.
상술한 바와 같은 본 발명에 의하면 전자사진 현상방식을 이용한 화상형성장치에서 감광드럼상에 설치된 대전롤러와 감광드럼과 동일한 방향으로 회전되게 설치하여 감광드럼의 잔류토너를 대전롤러로 닦아주며 회수할 수 있도록 하여 대전을 균일하게 하고 화상 오염등을 방지할 수 있는 잇점이 있다.According to the present invention as described above, in the image forming apparatus using the electrophotographic development method, it is installed to rotate in the same direction as the charging roller and the photosensitive drum installed on the photosensitive drum to wipe the residual toner of the photosensitive drum with the charging roller to recover. This makes the charging uniform and prevents image contamination.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970043780A KR19990020320A (en) | 1997-08-30 | 1997-08-30 | Charging device of electrophotographic process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970043780A KR19990020320A (en) | 1997-08-30 | 1997-08-30 | Charging device of electrophotographic process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR19990020320A true KR19990020320A (en) | 1999-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019970043780A KR19990020320A (en) | 1997-08-30 | 1997-08-30 | Charging device of electrophotographic process |
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| Country | Link |
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| KR (1) | KR19990020320A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009017603A2 (en) * | 2007-07-30 | 2009-02-05 | Hewlett-Packard Development Company, L.P. | Electrographic apparatus for forming a latent image on an imaging surface |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02259794A (en) * | 1989-03-31 | 1990-10-22 | Mutoh Ind Ltd | Cleaning device for electronic transfer printer |
| JPH04353877A (en) * | 1991-05-30 | 1992-12-08 | Canon Inc | Image forming device |
| JPH05249796A (en) * | 1992-03-06 | 1993-09-28 | Oki Electric Ind Co Ltd | Color electrophotographic printer |
-
1997
- 1997-08-30 KR KR1019970043780A patent/KR19990020320A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02259794A (en) * | 1989-03-31 | 1990-10-22 | Mutoh Ind Ltd | Cleaning device for electronic transfer printer |
| JPH04353877A (en) * | 1991-05-30 | 1992-12-08 | Canon Inc | Image forming device |
| JPH05249796A (en) * | 1992-03-06 | 1993-09-28 | Oki Electric Ind Co Ltd | Color electrophotographic printer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009017603A2 (en) * | 2007-07-30 | 2009-02-05 | Hewlett-Packard Development Company, L.P. | Electrographic apparatus for forming a latent image on an imaging surface |
| WO2009017603A3 (en) * | 2007-07-30 | 2009-04-16 | Hewlett Packard Development Co | Electrographic apparatus for forming a latent image on an imaging surface |
| GB2464239A (en) * | 2007-07-30 | 2010-04-14 | Hewlett Packard Development Co | Electrographic apparatus for forming a latent image on an imaging surface |
| US7764296B2 (en) | 2007-07-30 | 2010-07-27 | Hewlett-Packard Development Company, L.P. | Electrographic apparatus for forming a latent image on an imaging surface |
| GB2464239B (en) * | 2007-07-30 | 2012-07-18 | Hewlett Packard Development Co | Electrographic apparatus for forming a latent image on an imaging surface |
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