KR100389848B1 - Method for preventing recording paper from separating and sliding in electrophotographic printing machine - Google Patents

Method for preventing recording paper from separating and sliding in electrophotographic printing machine Download PDF

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KR100389848B1
KR100389848B1 KR1019960051830A KR19960051830A KR100389848B1 KR 100389848 B1 KR100389848 B1 KR 100389848B1 KR 1019960051830 A KR1019960051830 A KR 1019960051830A KR 19960051830 A KR19960051830 A KR 19960051830A KR 100389848 B1 KR100389848 B1 KR 100389848B1
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South Korea
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transfer
recording paper
paper
transfer drum
drum
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KR1019960051830A
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Korean (ko)
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KR19980031958A (en
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변상현
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삼성전자주식회사
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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
    • G03G15/65Apparatus which relate to the handling of copy material
    • G03G15/6555Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/6558Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point
    • 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
    • G03G15/65Apparatus which relate to the handling of copy material
    • G03G15/6502Supplying of sheet copy material; Cassettes therefor
    • G03G15/6511Feeding devices for picking up or separation of copy sheets
    • 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
    • G03G15/65Apparatus which relate to the handling of copy material
    • G03G15/6517Apparatus for continuous web copy material of plain paper, e.g. supply rolls; Roll holders therefor
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00Apparatus for electrophotographic processes
    • G03G2215/00362Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00396Pick-up device
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00Apparatus for electrophotographic processes
    • G03G2215/00362Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/004Separation device

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

Abstract

PURPOSE: A method for preventing a recording paper from separating and sliding in an electrophotographic printing machine is provided to prevent a recording paper from separating and sliding from a transfer drum by equalizing electrostatic force of the transfer drum and the recording paper. CONSTITUTION: A recording paper enters a space between a rotating transfer drum and a paper charging element(S1-S3). The recording paper is absorbed to the transfer drum by charging one area of the transfer drum with a predetermined paper charging voltage(S4). The transfer drum is rotated to transport the recording paper absorbed to the transfer drum to a photo sensitive medium(S5). A transfer voltage is additionally applied to the one area of the transfer drum simultaneously with applying the transfer voltage to the other area of the transfer drum(S7). The paper charging voltage is turned off when the rest area of the recording paper passes the paper charging element(S8). The paper charging element is separated from the transfer drum when the transfer is completed(S9-S12).

Description

전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법Method of separating and slipping recording paper of electrophotographic printing press

본 발명은 전자사진방식 인쇄방법에 관한 것으로, 상세하게는 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic printing method, and more particularly, to a method of separating recording paper and preventing slippage of an electrophotographic printing press.

통상, 전자사진방식 인쇄기는, 원고로부터 또는 소정의 소스로부터 취득한 화상정보에 따라 감광매체를 노광하여 감광매체상에 보이지 않는 정전잠상을 형성하고, 그 정전잠상이 형성된 부위에 현상제(토너)를 부착시켜 그 정전잠상이 드러나 보이도록 현상하여 그 현상된 화상을 기록지에 전사하고 정착시킴으로써 원하는 화상을 인쇄하게끔 되어 있다.In general, an electrophotographic printing press exposes a photosensitive medium according to image information obtained from an original or from a predetermined source to form an electrostatic latent image on the photosensitive medium, and applies a developer (toner) to a portion where the electrostatic latent image is formed. By attaching and developing the electrostatic latent image to be visible, the desired image is printed by transferring and fixing the developed image onto recording paper.

도 1은 통상적인 전자사진방식 인쇄기의 개략적으로 나타내 보인 도면이다. 도 1에 도시된 바와 같이 전자사진방식 인쇄기는, 감광드럼(15)을 노광시키는 노광용 광학계(11)와, 노광된 감광드럼(15)을 현상하는 현상유닛트(12)와, 기록지(20)를 감광드럼(15)으로 이송시키는 전사드럼(14)을 포함한다. 전사드럼(14)에는 그 외주면에 유전체필름(30)이 코팅되고, 그 배면에는 코로나전하를 인가하는 전사코로트론(31)이 설치된다. 상기 전사드럼(14)에 근접한 위치에 카세트(17)로부터 급지되는 기록지(20)를 전사드럼(14)으로 가이드하는 그리퍼(21)가 설치된다. 상기 전사드럼(14)의 일측에는 카세트(17)로부터 급지되는 기록지(20)를 전사드럼(14)에 밀착되도록 대전시키는 종이대전롤러(16)가 마련된다. 그리고, 기록지(20)가 감광드럼(15)을 완전히 통과하여 전사가 완료된 후, 기록지(20)를 전사드럼(14)에서 분리시키기 위한 분리수단(23), 전사가 완료된 기록지(20)에 부착된 토너를 정착시키는 정착기(22), 새로운 인쇄를 위하여 전사드럼(14)상에 잔재하는 토너를 클리닝하는 클리닝장치(18), 전사드럼(14)의 전위를 제거하는 제전 수단(19)을 구비한다.1 is a view schematically showing a conventional electrophotographic printing press. As shown in FIG. 1, an electrophotographic printing machine includes an optical system 11 for exposing the photosensitive drum 15, a developing unit 12 for developing the exposed photosensitive drum 15, and a recording sheet 20. And a transfer drum 14 for transferring to the photosensitive drum 15. The transfer drum 14 is coated with a dielectric film 30 on an outer circumferential surface thereof, and a transfer corrotron 31 for applying corona charges is installed on the rear surface thereof. A gripper 21 for guiding the recording paper 20 fed from the cassette 17 to the transfer drum 14 is provided at a position proximate to the transfer drum 14. One side of the transfer drum 14 is provided with a paper charging roller 16 for charging the recording paper 20 fed from the cassette 17 to be in close contact with the transfer drum 14. Then, after the recording paper 20 has completely passed through the photosensitive drum 15 and the transfer is completed, the separating means 23 for separating the recording paper 20 from the transfer drum 14 and attached to the recording paper 20 having completed the transfer. A fixing unit 22 for fixing the old toner, a cleaning device 18 for cleaning the toner remaining on the transfer drum 14 for new printing, and an electrostatic discharge means 19 for removing the potential of the transfer drum 14; do.

이와 같은 구조의 전자사진방식 인쇄기의 동작을 설명하면, 급지 카세트(17)로부터 급지된 기록지(20)가 그리퍼(21)에 의해 그리핑되어 종이대전롤러(16)로 이송된다. 상기 기록지가 종이대전롤러(16)를 통과할 때, 상기 종이대전롤러(16)는 유전체필름(30)을 종이대전전압(V1)으로 대전시켜 기록지(20)가 유전체필름(30)에 흡착되게 한다. 흡착된 기록지(20)는 전사드럼(14)과 함께 회전하여 감광드럼(15)으로 이송된다.Referring to the operation of the electrophotographic printing machine having such a structure, the recording paper 20 fed from the paper feed cassette 17 is gripped by the gripper 21 and is transferred to the paper charging roller 16. When the recording paper passes through the paper charging roller 16, the paper charging roller 16 charges the dielectric film 30 to the paper charging voltage V1 so that the recording paper 20 is adsorbed on the dielectric film 30. do. The absorbed recording paper 20 rotates together with the transfer drum 14 and is transferred to the photosensitive drum 15.

한편, 기록지가 감광드럼(15)으로 이송되는 동안에 노광용 광학계(11)에서 출사된 화상정보를 담은 광은 감광드럼(15)을 노광시키고, 노광된 감광드럼(15)은 현상유니트(12)의 토너가 이송되는 것에 의하여 현상된다. 한편, 감광드럼(15)으로 이송된 기록지(20)는 감광드럼(16)을 지나는 시점에서 전사코로트론(31)에 의해 유천체필름(30)이 전사전압(V2)으로 대전되고 따라서 기록지(20)로 전사가 시작된다. 감광드럼(15)을 완전히 지난 전사가 완료된 기록지(20)는 정착기(22)를 통과하여 정착되고 외부로 배출되어 인쇄를 완료한다.On the other hand, the light containing the image information emitted from the optical system for exposure 11 while the recording paper is transferred to the photosensitive drum 15 exposes the photosensitive drum 15, and the exposed photosensitive drum 15 is exposed to the developing unit 12. It is developed by transferring the toner. On the other hand, in the recording paper 20 transferred to the photosensitive drum 15, the transfer film 30 is charged to the transfer voltage V2 by the transfer corotron 31 at the time when the photosensitive drum 16 passes. Transfer begins at 20. The recording paper 20 on which transfer is completed after the photosensitive drum 15 is completed is fixed through the fixing unit 22 and discharged to the outside to complete printing.

그런데, 기록지(20)는 소정의 길이를 가지므로, 기록지(20)의 선단영역(20a)이 감광드럼(15)을 통과하는 동안 나머지영역(20b)이 종이대전롤러(16)를 통과하게 된다. 이때, 유전체필름(30)에 종이대전전압(V1)이 인가된 상태에서 기록지(20)의 선단이 위치한 유전체필름(30)의 일측영역에 전사전압(V2)이 인가되면 전사된 기록지의 선단영역(20a)과 유전체필름(30)과의 전압차와, 아직 전사되지 않은 기록지의 나머지영역(20b)과 유전체필름(30)의 일측영역과 각각 전압차이가 달라지게 된다. 즉, 감광드럼(15)을 통과한 전사가 완료된 기록지(20)의 선단영역(20a)과 유전체필름(30) 사이에서의 전압차가 전사전압(V1)만큼 낮아지게 되어 V2-V1이 되고, 아직 전사가 이루어지지 않은 기록지(20)의 나머지영역(20b)과 유전체필름(30)과의 전압차는 V1을 유지하는 것이다. 따라서, 감광드럼(15)을 통과한 기록지(20)의 선단영역(20a)과 유전체필름(30) 사이의 전압차가 작아지므로 정전기력이 약해져 기록지(20)는 유전체필름(30)에서 분리되거나 미끄러짐이 발생되는 요인으로 되어 정밀한 인쇄를 방해한다.However, since the recording paper 20 has a predetermined length, the remaining area 20b passes through the paper charging roller 16 while the leading area 20a of the recording paper 20 passes through the photosensitive drum 15. . At this time, when the transfer voltage V2 is applied to one region of the dielectric film 30 where the tip of the recording paper 20 is positioned while the paper charging voltage V1 is applied to the dielectric film 30, the leading region of the transferred recording paper is applied. The voltage difference between the 20a and the dielectric film 30 and the voltage difference between the remaining area 20b and the one side area of the dielectric film 30 which have not yet been transferred are different. That is, the voltage difference between the front end region 20a and the dielectric film 30 of the recording paper 20 on which the transfer of the photosensitive drum 15 is completed is lowered by the transfer voltage V1 to become V2-V1. The voltage difference between the remaining region 20b and the dielectric film 30 of the recording paper 20 which is not transferred is to maintain V1. Therefore, since the voltage difference between the tip region 20a of the recording paper 20 passing through the photosensitive drum 15 and the dielectric film 30 is reduced, the electrostatic force is weakened, so that the recording paper 20 is separated or slipped from the dielectric film 30. It is a factor that is caused to prevent precise printing.

본 발명은 상기와 같은 문제점을 해결하기 위해 창출된 것으로서, 전사과정중에 전사드럼과 기록지와의 정전기력을 일정하게 하여 전사드럼에서 기록지가 분리 또는 미끄러짐을 방지할 수 있는 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법을 제공하는 것을 목적으로 한다.The present invention has been made to solve the above problems, and the separation of the recording paper of the electrophotographic printing machine which can prevent the separation or slipping of the recording paper in the transfer drum by making the electrostatic force between the transfer drum and the recording paper constant during the transfer process. It is an object to provide a slip prevention method.

도 1은 통상적인 전자사진방식 인쇄기의 개략적 구성도.1 is a schematic configuration diagram of a conventional electrophotographic printer.

도 2는 본 발명에 따른 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법을 플로우 챠트로 나타내 보인 도면.2 is a flow chart illustrating a method of separating and slipping a recording sheet of an electrophotographic printer according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

11 ... 노광용 광학계12 ... 현상유닛트11 ... optical system for exposure 12 ... developing unit

13 ... 회전체13a ... 현상기13 ... rotating body 13a ... developing unit

14 ... 전사드럼15 ... 감광드럼14 ... transcription drum 15 ... photosensitive drum

17 ... 카세트18 ... 제전기17 ... cassette 18 ... static eliminator

19 ... 클리닝장치20 ... 기록지19 ... Cleaning unit 20 ... Recording paper

21 ... 그리퍼22 ... 정착기21 ... Grippers 22 ... Fuser Units

23 ... 분리수단30 ... 유전체필름23 ... separating means 30 ... dielectric film

31 ... 전사코로트론31 ... Warrior Corotron

상기와 같은 목적을 달성하기 위하여, 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법은, 회전되는 전사드럼과 종이대전수단 사이로 기록지를 진입시키는 단계; 상기 종이대전수단에 접촉된 전사드럼의 일측영역을 소정의 종이대전전압으로 대전시켜 상기 기록지를 상기 전사드럼에 흡착시키는 단계; 상기 전사드럼을 회전시켜 전사드럼에 흡착된 기록지를 감광매체쪽으로 이송시키는 이송단계; 상기 감광매체를 통과하는 상기 기록지와 접촉하는 전사드럼의 타측영역에 전사전압을 인가할 때, 동시에 상기 종이대전수단이 접촉된 전사드럼의 상기 일측영역에 전사전압을 추가로 인가하는 전사전압인가단계;를 포함하여 된 것을 특징으로 한다.In order to achieve the above object, the recording paper separation and slip prevention method of the electrophotographic printing machine includes the steps of: entering the recording paper between the rotating transfer drum and the paper charging means; Adsorbing the recording paper to the transfer drum by charging a region of one side of the transfer drum in contact with the paper charge means to a predetermined paper charge voltage; A transfer step of rotating the transfer drum to transfer recording paper absorbed by the transfer drum toward a photosensitive medium; When a transfer voltage is applied to the other region of the transfer drum in contact with the recording paper passing through the photosensitive medium, at the same time, a transfer voltage applying step of additionally applying a transfer voltage to the one region of the transfer drum to which the paper charging means is in contact. It characterized by including;

본 발명에 있어서, 상기 종이대전수단에 의해 인가되는 종이대전전압을 상기 기록지의 나머지영역이 통과할 때 오프하는 단계;를 더 포함하는 것이 바람직하고, 상기 기록지에 전사가 완료되는 시점에서 상기 종이대전수단을 상기 전사드럼으로부터 분리시키는 단계;를 더 포함하는 것이 바람직하다.In the present invention, the step of turning off the paper charge voltage applied by the paper charging means when the remaining area of the recording paper passes; preferably, the paper charging at the time when the transfer to the recording paper is completed Separating the means from the transfer drum; preferably.

이하, 본 발명에 따른 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법을 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a recording sheet separation and slip prevention method of an electrophotographic printer according to the present invention will be described in detail with reference to the accompanying drawings.

일반적으로 전자사진방식 인쇄기는 도 1에 도시된 바와 같이, 화상정보에 따른 광을 주사하여 노광시키는 노광용 광학계(11)와, 노광에 의해 정전잠상이 형성되는 감광매체, 예컨대 감광드럼(15)과, 이 감광드럼(15)에 형성된 정전잠상을 현상하는 현상유닛트(12)를 구비한다. 이때, 상기 현상유닛트(12)는 감광드럼(15)과 인접하게 위치되어 회전 작동되는 회전체(13)에 각각 다른 색깔의 토너들이 수용된 복수의 현상기(13a)들이 방사상으로 내장 설치된 구조를 하고 있다. 상기 감광드럼(15)의 일측과 인접한 위치에는 감광드럼(15)에 현상된 토너 화상이 기록지(20)로 전사되도록, 상기 기록지(20)를 감광드럼(15)으로 이송시키는 전사드럼(14)이 설치된다. 상기 전사드럼(14)의 외주면에는 유전체필름(30)이 코팅된다. 상기 유전체필름(30)에 인접된 위치에는 유전체필름(30)에 밀착 또는 분리되는 종이대전롤러(16)가 설치된다. 상기 유전체필름(30)에 인접된 타측에는 그리퍼(21)에 의해 그리핑되어 이송된 기록지(20)를 종이대전전압(V1)으로 대전시키기 위한 종이대전롤러(16)가 위치된다. 이때, 상기 종이대전롤러(16)는 전사가 완료되는 시점에서 도시되지 않은 캠 등의 구동수단에 의해 유전체필름(30)에서 밀착된 상태에서 분리된다. 또한, 상기 감광드럼(15)과 접하는 전사드럼의 내부에는 기록지(20)에 코로나전하를 인가하는 전사코로트론(31)이 설치된다. 그리고, 기록지(20)가 감광드럼(15)을 완전히 통과하여 전사가 완료된 후, 기록지(20)를 전사드럼(14)에서 분리시키기 위한 분리수단(23), 전사가 완료된 기록지(20)에 부착된 토너를 정착시키는 정착기(22), 새로운 인쇄를 위하여 전사드럼(14)상에 잔재하는 토너를 클리닝하는 클리닝장치(18) 및 유전체필름(30)의 전위를 제거하는 제전수단(19)등을 구비한다.In general, an electrophotographic printing machine, as shown in Fig. 1, an optical system for exposure 11 for scanning and exposing light according to the image information, and a photosensitive medium, such as a photosensitive drum 15, in which an electrostatic latent image is formed by exposure; And a developing unit 12 for developing an electrostatic latent image formed on the photosensitive drum 15. At this time, the developing unit 12 has a structure in which a plurality of developing devices 13a are formed radially embedded in the rotating body 13 which is positioned adjacent to the photosensitive drum 15 to accommodate toners of different colors. . A transfer drum 14 for transferring the recording paper 20 to the photosensitive drum 15 so that the toner image developed on the photosensitive drum 15 is transferred to the recording paper 20 at a position adjacent to one side of the photosensitive drum 15. This is installed. A dielectric film 30 is coated on the outer circumferential surface of the transfer drum 14. At a position adjacent to the dielectric film 30, a paper charge roller 16 is installed in close contact with or separated from the dielectric film 30. On the other side adjacent to the dielectric film 30, a paper charging roller 16 for charging the recording paper 20 gripped and conveyed by the gripper 21 to the paper charging voltage V1 is positioned. At this time, the paper charging roller 16 is separated from the contact state in the dielectric film 30 by a driving means such as a cam (not shown) at the time when the transfer is completed. In addition, a transfer corrotron 31 for applying corona charges to the recording paper 20 is provided inside the transfer drum in contact with the photosensitive drum 15. Then, after the recording paper 20 has completely passed through the photosensitive drum 15 and the transfer is completed, the separating means 23 for separating the recording paper 20 from the transfer drum 14 and attached to the recording paper 20 having completed the transfer. A fixing unit 22 for fixing the old toner, a cleaning device 18 for cleaning the toner remaining on the transfer drum 14 for new printing, and an antistatic means 19 for removing the potential of the dielectric film 30, and the like. Equipped.

이와 같은 구조의 전자사진방식 인쇄기의 인쇄방법을 도 2에 도시된 플로우 챠트를 참조하여 설명하면 다음과 같다.The printing method of the electrophotographic printing machine having such a structure will be described with reference to the flowchart shown in FIG. 2.

급지 카세트(17)로부터 급지된 기록지(20)는 그리퍼(21)에 의해 그리핑되어 상기 유전체필름(30)에 밀착되어 회전되는 종이대전롤러(16)로 이송된다(S1∼S3). 다음, 상기 종이대전롤러(16)는 기록지(20)가 상기 유전체필름(30)을 지날 때, 그 유전체필름(30)을 종이대전전압(V1)으로 대전하여 기록지(20)가 유전체필름(30)에 흡착(S4)되게 한다. 이 흡착된 기록지(20)는 전사드럼(14)이 시계 방향으로 회전되는 것에 의해 감광드럼(15)과 접촉되어 있는 전사위치로 이송된다. 한편, 기록지(20)가 감광드럼(15)으로 이송되는 동안에, 노광용 광학계(11)에서 출사된 화상정보를 담은 광은 감광드럼(15)을 노광시키고(S5), 노광된 감광드럼(15)으로 현상유니트(12)의 토너가 이송되는 것에 의하여 현상이 진행된다(S6).The recording paper 20 fed from the paper feed cassette 17 is gripped by the gripper 21 and transferred to the paper charging roller 16 which is in close contact with the dielectric film 30 and rotated (S1 to S3). Next, when the recording paper 20 passes the dielectric film 30, the paper charging roller 16 charges the dielectric film 30 to the paper charging voltage V1 so that the recording paper 20 is the dielectric film 30. ) To adsorption (S4). The absorbed recording paper 20 is transferred to the transfer position in contact with the photosensitive drum 15 by rotating the transfer drum 14 clockwise. On the other hand, while the recording paper 20 is transferred to the photosensitive drum 15, the light containing the image information emitted from the optical system 11 for exposure exposes the photosensitive drum 15 (S5) and the exposed photosensitive drum 15. As the toner in the developing unit 12 is transferred, the development proceeds (S6).

다음, 계속 이송되는 기록지(20)가 감광드럼(15)을 지나는 시점에서 전사코로트론(31)은 코로나방전에 의해 유전체필름(30)에 전사전압(V2)을 인가하고 감광드럼(15)에 현상되어진 토너가 기록지(20)로 전사되기 시작된다(S7). 여기서, 기록지(20)는 소정의 길이를 가지므로, 기록지(20)의 선단영역(20a)이 감광드럼(15)을 통과할 때, 나머지영역(20b)은 종이대전롤러(16)를 통과한다. 상기 전사전압(V2)은 기록지(20)의 선단영역(20a)이 감광드럼(15)을 지날 때, 그 감광드럼(15)에 접촉된 영역으로 인가되는 것이므로 선단영역(20a)과 유전체필름(30)과의 전압차는 V1-V2가 되어 선단영역(20a)과 유전체필름(30)과의 정전기력이 약해지게 된다. 본 발명의 특징에 따르면, 상기와 같은 정전기력의 약화를 방지하기 위해, 상기 감광드럼(15)과 인접한 유전체필름(30)의 영역에 전사전압(V2)이 인가할 때 동시에 종이대전롤러(16)와 밀착된 유전체필름(30)의 영역에 상기 전사전압(V2)만큼을 더 인가한다. 즉, 전사가 완료된 기록지(20)의 선단영역(20a)영역과 유전체필름(30) 사이의 전압차가 전사전압(V2) 만큼 낮아지는 것을 보상하기 위하여 전사가 시작되는 시점에서 전사전압(V2)을 더 인가하여 주는 것이다. 이렇게 함으로써, 전사가 이루어진 선단영역(20a)이 유전체필름(30)과 이루는 전압차와, 전사가 아직 이루어지지 않은 나머지영역(20b)과 유전체필름(30)과 이루는 전압차를 일정하게 할 수 있으므로, 전압차에 의한 정전기력의 변화를 방지할 수 있다.Next, at a time when the continuously transported recording paper 20 passes through the photosensitive drum 15, the transfer corotron 31 applies a transfer voltage V2 to the dielectric film 30 by corona discharge and the photosensitive drum 15. The toner developed at this point is transferred to the recording paper 20 (S7). Here, since the recording paper 20 has a predetermined length, when the leading area 20a of the recording paper 20 passes through the photosensitive drum 15, the remaining area 20b passes through the paper charging roller 16. . The transfer voltage V2 is applied to the area in contact with the photosensitive drum 15 when the front end region 20a of the recording paper 20 passes through the photosensitive drum 15, and thus the front end region 20a and the dielectric film ( The voltage difference with 30 becomes V1-V2, so that the electrostatic force between the tip region 20a and the dielectric film 30 is weakened. According to a feature of the present invention, in order to prevent the weakening of the electrostatic force, when the transfer voltage (V2) is applied to the region of the dielectric film 30 adjacent to the photosensitive drum 15 at the same time the paper charging roller 16 Is further applied as much as the transfer voltage V2 to the region of the dielectric film 30 in close contact with. That is, in order to compensate that the voltage difference between the tip region 20a of the recording paper 20 on which the transfer is completed and the dielectric film 30 is lowered by the transfer voltage V2, the transfer voltage V2 is changed at the time when the transfer is started. It is more authorized. By doing so, the voltage difference between the front end region 20a on which the transfer is made and the dielectric film 30 and the voltage difference between the remaining region 20b and the dielectric film 30 which have not yet been transferred can be made constant. Therefore, the change of the electrostatic force due to the voltage difference can be prevented.

다음, 기록지(20)의 나머지영역(20b) 계속 진행하여 종이대전롤러(16)를 완전히 지나게 되면 종이대전전압을 오프(S8)한다.Next, when the remaining area 20b of the recording sheet 20 continues to pass through the paper charging roller 16 completely, the paper charging voltage is turned off (S8).

다음, 현상드럼(15)에 현상이 완료(S10)되고, 상기 기록지(20)에 전사가 완료(S11)되면, 이 시점에서 종이대전롤러(16)를 도시되지 않은 구동수단에 의해 유전체필름(30)에서 분리시킨다(S12). 이는, 만약, 전사가 이루어지고 있는 시점에서 종이대전롤러(16)가 유전체필름(30)에서 분리되면, 그 착탈에 의한 부하 변동으로 올바른 전사를 방해하기 때문이다.Next, when development is completed in the developing drum 15 (S10) and transfer is completed on the recording paper 20 (S11), at this point, the paper charging roller 16 is driven by a dielectric film (not shown) by driving means (not shown). Separate from 30) (S12). This is because if the paper charging roller 16 is separated from the dielectric film 30 at the time when the transfer is performed, correct transfer is prevented due to the load variation caused by the detachment.

다음, 상기와 같은 과정을 복수회 반복하여 소정의 컬러 화상을 기록지(20)에 중합 전사하고, 기록지(20)를 유전체필름(30)에서 분리시키기 위한 분리수단(23), 전사가 완료된 기록지(20)에 부착된 토너를 정착시키는 정착기(22)를 거쳐 인쇄를 완료한다. 그리고, 전사드럼(14)상에 잔재하는 토너를 클리닝장치(18)로 제거하고, 전사드럼(14)의 전위를 제전수단(19)으로 제거하여 다음 컬러 인쇄를 준비한다(S13).Next, the above-described process is repeated a plurality of times to polymerize and transfer a predetermined color image onto the recording paper 20, and separation means 23 for separating the recording paper 20 from the dielectric film 30, and the recording paper on which transfer is completed ( Printing is completed via the fixing unit 22 which fixes the toner attached to 20). Then, the toner remaining on the transfer drum 14 is removed by the cleaning device 18, and the potential of the transfer drum 14 is removed by the antistatic means 19 to prepare for the next color printing (S13).

상술한 바와 같이, 본 발명에 따르면, 전사가 이루어지는 동안에 기록지와 유전체필름 사이의 정전기력을 일정하기 하기 위하여, 전사전압이 인가되는 시점에서 초기 종이대전전압에서 전사전압만큼 전압차가 낮아지는 유전체필름 영역에 상기한 전사전압을 더 인가한다. 이렇게 함으로써, 기록지와 유전체필름 사이의 전압차를 일정하게 하여 정전기력을 일정하게 할 수 있고, 따라서 기록지가 유전체필름에서 분리 또는 미끄러지는 것이 방지된다. 또한, 종이대전롤러가 전사가 완료된 시점에서 전사드럼에서 분리되므로 종이대전롤러의 착탈에 의한 전사드럼의 부하 변동을 막을 수 있다. 따라서 고화질의 인쇄가 가능하다.As described above, according to the present invention, in order to maintain the electrostatic force between the recording paper and the dielectric film during the transfer, the dielectric film region in which the voltage difference is lowered by the transfer voltage at the initial paper charge voltage at the time of the transfer voltage is applied. The above transfer voltage is further applied. By doing so, the voltage difference between the recording paper and the dielectric film can be made constant so that the electrostatic force can be made constant, thereby preventing the recording paper from being separated or slipping on the dielectric film. In addition, since the paper charging roller is separated from the transfer drum at the time when the transfer is completed, the load variation of the transfer drum due to the detachment of the paper charging roller can be prevented. Therefore, high quality printing is possible.

Claims (3)

회전되는 전사드럼과 종이대전수단 사이로 기록지를 진입시키는 단계;Inserting recording paper between the rotating drum and the paper charging means rotated; 상기 종이대전수단에 접촉된 전사드럼의 일측영역을 소정의 종이대전전압으로 대전시켜 상기 기록지를 상기 전사드럼에 흡착시키는 단계;Adsorbing the recording paper to the transfer drum by charging a region of one side of the transfer drum in contact with the paper charge means to a predetermined paper charge voltage; 상기 전사드럼을 회전시켜 전사드럼에 흡착된 기록지를 감광매체쪽으로 이송시키는 이송단계;A transfer step of rotating the transfer drum to transfer recording paper absorbed by the transfer drum toward a photosensitive medium; 상기 감광매체를 통과하는 상기 기록지와 접촉하는 전사드럼의 타측영역에 전사전압을 인가할 때, 동시에 상기 종이대전수단이 접촉된 전사드럼의 상기 일측영역에 전사전압을 추가로 인가하는 전사전압인가단계;를 포함하여 된 것을 특징으로 하는 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법.When a transfer voltage is applied to the other region of the transfer drum in contact with the recording paper passing through the photosensitive medium, at the same time, a transfer voltage applying step of additionally applying a transfer voltage to the one region of the transfer drum to which the paper charging means is in contact. Separation and slip prevention method of the recording sheet of the electrophotographic printing machine comprising a. 제1항에 있어서, 상기 종이대전수단에 의해 인가되는 종이대전전압을 상기 기록지의 나머지영역이 통과할 때 오프하는 단계;를 더 포함하여 된 것을 특징으로 하는 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법.The recording sheet separation and slip prevention of the electrophotographic printing press according to claim 1, further comprising the step of turning off the paper charging voltage applied by the paper charging means when the remaining area of the recording paper passes. Way. 제1항에 있어서, 상기 기록지에 전사가 완료되는 시점에서 상기 종이대전수단을 상기 전사드럼으로부터 분리시키는 단계;를 더 포함하는 것을 특징으로 하는 전자사진방식 인쇄기의 기록지 분리 및 미끄러짐 방지방법.The method of claim 1, further comprising: separating the paper charging means from the transfer drum at the time when the transfer of the recording paper is completed.
KR1019960051830A 1996-10-31 1996-10-31 Method for preventing recording paper from separating and sliding in electrophotographic printing machine KR100389848B1 (en)

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