KR930000489B1 - Sheet guiding apparatus for laser printer - Google Patents

Sheet guiding apparatus for laser printer Download PDF

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Publication number
KR930000489B1
KR930000489B1 KR1019890019654A KR890019654A KR930000489B1 KR 930000489 B1 KR930000489 B1 KR 930000489B1 KR 1019890019654 A KR1019890019654 A KR 1019890019654A KR 890019654 A KR890019654 A KR 890019654A KR 930000489 B1 KR930000489 B1 KR 930000489B1
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Prior art keywords
paper
photosensitive drum
laser printer
guide plate
guide
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KR1019890019654A
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Korean (ko)
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KR910011485A (en
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조원모
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삼성전자 주식회사
정용문
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41LAPPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L21/00Devices for conveying sheets or webs of copy material through the apparatus or machines for manifolding, duplicating, or printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J15/00Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs

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  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)

Abstract

In the laser printer, the optical system is positioned at the lower part of photosensitive drum (1), and the paper is transcribed at the upper surface of the drum (1). The guiding device is mounted fo curved guide rib (10) of insulating material between the photosensitive drum (1) and fixing roller (8), mounting a guiding plate (11) consisting of the electroconductive materials at the lower surface of the guide rib (10). The guiding plate (11) is connected to the ground.

Description

레이져 프린터의 용지안내 장치Paper guide device of laser printer

제1도는 종래 레이져 프린터의 용지안내 장치의 개략도.1 is a schematic diagram of a paper guide device of a conventional laser printer.

제2도는 본 발명 레이져 프린터의 용지안내 장치의 개략도.2 is a schematic diagram of a paper guide device of the present invention laser printer.

제3도는 본 발명의 동작도.3 is an operation diagram of the present invention.

본 발명은 전사기가 감광드럼의 상면에 설치되는 레이져 프린터에서 용지를 안내하여 이송하는 장치에 관한 것이다. 종래에는 감광드럼의 상면에 광학계를 위치시키고 상기 감광드럼의 하측에 전사부를 위치시켜 용지에 화상을 전사시켜 이송시키는 방법을 사용하였었다. 그러나 이와 같은 종래의 장치는 용지의 이송경로가 길어질 뿐아니라 카바를 여닫을때 광학계에 충격이 가해지므로 근래에는 감광드럼의 하측에 광학계를 위치시키고 감광드럼의 상면으로 용지를 반송시켜 화상을 전사하는 장치가 개발되었다. 이러한 장치는 제1도에 도시된 바와 같이 감광드럼(1)의 하단에 광학계(100)를 위치시키고 광학계(100)에서 주사된 빛이 대전기(2)에 의해 대전된 감광드럼(1)에 조사되면 이를 현상기(3)에서 토너로 현상하며 이후 용지카세트(4)에서 이송되는 용지(5)에 전사기(6)에 의해 전사되어져 이송벨트(7)에 안내되어져 정착기(8)측으로 이송된다. 이때 전사된 화상이 용지의 밑면에 있기 때문에 밑면에 가이드를 설치할 수 없기 때문에 감광드럼(1)에서 분리되어 이송벨트(7)에 의해 이송되는 과정에서 용지(5)가 자체중량에 의하여 중력방향(P)으로 낙하하려는 힘이 작용하므로 이를 상쇄하기 위한 힘이 필요로 한다. 이러한 장치로서 종래에는 이송벨트(7)의 상면에 팬(9)을 설치하며 이송벨트(7)에는 공기의 유통을 위한 다수개의 구멍(7')을 형성하였다. 그러므로 팬(9)이 구동에 의해 공기를 흡인하여 용지를 이송벨트(7)에 흡착시켜 이송하였다. 그러나 이와 같은 장치는 용지의 선단이 중력방향으로 떨어져 잼의 원인이 되고 전사후 용지의 거동이 불규칙하므로 화질의 저하를 초래하게 된다. 또한 감광드럼 주위에 공기의 유동이 생기기 때문에 용지의 흔들림이 발생하여 일련의 전사과정에 영향을 미치게 되며 벨트등을 구동하기 위한 구동토크가 크므로 구조가 복잡해지며 기기가 커지는 문제점이 있었다.The present invention relates to an apparatus for guiding and conveying a sheet of paper from a laser printer installed on an upper surface of a photosensitive drum. In the related art, a method of transferring an image onto a sheet by transferring an image onto a sheet by placing an optical system on an upper surface of the photosensitive drum and a transfer unit below the photosensitive drum is used. However, such a conventional device not only lengthens the conveying path of the paper but also impacts the optical system when the cover is opened and closed. In recent years, an apparatus for transferring an image by placing the optical system under the photosensitive drum and conveying the paper to the upper surface of the photosensitive drum Was developed. Such an apparatus places the optical system 100 at the bottom of the photosensitive drum 1 as shown in FIG. 1 and the light scanned from the optical system 100 is applied to the photosensitive drum 1 charged by the charger 2. When irradiated, it is developed into toner in the developing device 3, and then transferred to the paper 5 conveyed by the paper cassette 4 by the transfer machine 6, guided by the conveying belt 7, and conveyed to the fixing unit 8 side. . At this time, since the transferred image is located on the bottom of the paper, the guide cannot be installed on the bottom, so that the paper 5 is separated from the photosensitive drum 1 and transported by the conveying belt 7. The force to fall to P) acts, so a force is needed to offset it. As such a device, in the related art, a fan 9 is installed on an upper surface of the conveyance belt 7, and a plurality of holes 7 ′ for distributing air are formed in the conveyance belt 7. Therefore, the fan 9 sucks air by driving, and the paper is sucked onto the conveyance belt 7 and conveyed. However, in such a device, the leading edge of the paper falls in the direction of gravity, which causes jams, and the behavior of the paper after transfer is irregular, resulting in deterioration of image quality. In addition, because the air flows around the photosensitive drum, the paper is shaken, which affects a series of transfer processes, and the driving torque for driving the belt is large, resulting in a complicated structure and a large device.

본 발명은 상기와 같은 문제점을 해소하기 위하여 안출한 것으로서 간단한 구성에 의하여 용지가 낙하하지 않고 안정되게 이송시킬 수 있도록 함에 목적이 있다.The present invention has been made in order to solve the above problems, and an object thereof is to enable the paper to be transported stably without falling by a simple configuration.

본 발명의 또다른 목적은 간단한 구성으로 이루어 기기의 부피를 축소시키며 용지를 흡착하기 위한 별도의 동력사용을 배제하므로 전력의 낭비를 줄이는 데 있다.Another object of the present invention is to reduce the waste of the power by reducing the volume of the device made of a simple configuration and eliminating the use of separate power for adsorbing the paper.

상기와 같은 목적을 달성하기 위한 실시예를 첨부된 도면에 의거 상세히 설명하면 다음과 같다.An embodiment for achieving the above object will be described in detail with reference to the accompanying drawings.

우선 제2도를 참조하여 본 발명의 구성을 설명하면 감광드럼(1)와 정착기(8) 사이에 절연체로 만곡진 가이드리브(10)를 설치하고 상기 가이드리브(10)의 하면에 도전성 물질로 이루어진 안내판(11)을 설치하며 상기 안내판(11)은 접지되도록 한 것이다.First, the configuration of the present invention will be described with reference to FIG. 2. A curved guide rib 10 is formed between the photosensitive drum 1 and the fixing unit 8 by an insulator, and a conductive material is formed on the lower surface of the guide rib 10. The guide plate 11 is formed and the guide plate 11 is grounded.

이와 같이 구성된 본 발명의 작용효과는 급지카세트(4)에서 급지되어 레지스터 로울러(20)에 의해 이송되는 용지는 대전기(2)에 의해 대전되어지고 광학계(100)으로부터 노광되어 정전잠상이 형성된 감광드럼(1)의 표면에 상을 전사한 후 이송되어져 안내판(11)에 밀착안내되어 정착기(8)로 이송되게 되는데 이를 좀더 상세히 설명하면 레이져 프린터에 있어서는 반전 현상법을 이용하는데 반전 현상법이란 감광드럼 표면에 초기에 음(-)전하로 대전시킨 다음 역시 현상기의 현상바이어스 전압을 통하여 토너를 감광드럼(1)에 이송시키는 현상법이다. 이러한 현상법에서 전사과정은 감광드럼에 음(-)의 전하를 가진 토너가 부착되어 있기 때문에 전사기(11)에는 양(+)의 고전압을 걸어 코로나 방전에 의해 용지 윗면에 (+)전하를 대전시켜 감광드럼(1)위에 있는 토너를 용지로 이송시킨다. 이때 전사하고난 용지의 뒷면에서 양(+)의 전하를 가진 정전기가 발생하게 된다. 이렇게 (+)로 대전된 용지가 도전체로된 안내판(11)을 통과하게 되면 안내판(11)에서는 정전유도현상이 발생하게 되어 용지편에 (-), 반대편에 (+)로 되는 유도현상이 일어나는 안내판(11)과 용지(5) 사이에 쿨롱력이 발생하게 된다.The effect of the present invention configured as described above is a photosensitive paper that is fed from the paper feed cassette 4 and conveyed by the register roller 20 is charged by the charger 2 and exposed from the optical system 100 to form an electrostatic latent image. After transferring the image on the surface of the drum (1) is transferred to the guide plate 11 to be guided to the fuser (8), which is described in more detail in the laser printer using a reverse development method, the reverse development method is a photosensitive The drum surface is initially charged with negative (-) charge, and is then a developing method for transferring the toner to the photosensitive drum 1 through the developing bias voltage of the developing device. In this developing method, since the toner with a negative charge is attached to the photosensitive drum, a positive high voltage is applied to the transfer machine 11 so that a positive charge is applied to the upper surface of the paper by corona discharge. By charging, the toner on the photosensitive drum 1 is transferred to paper. At this time, static electricity with a positive charge is generated on the back side of the transferred paper. When the positively charged paper passes through the guide plate 11 made of a conductor, the electrostatic induction phenomenon occurs in the guide plate 11, and the induction phenomenon becomes negative on the paper piece and positive on the opposite side. Coulomb force is generated between the guide plate 11 and the paper 5.

이것을 제4도에서와 같이 용지와 금속판 사이의 힘

Figure kpo00001
(F : 쿨롱력, K : 상수, Q2은 용지에 발생한 전하량, Q1는 금속판에 발생한 전하량 r=용지와 금속판 사이의 거리)의 공식에 의하여 용지와 금속판의 거리 r이 작을수록 전하량 Q1, Q2이 클수록 전기력이 커져 용지(5)가 안내판(11)에 밀착되는 힘이 커지지 않고 안내판과 부착하게 된다. 이와 같은 상태에서 레지스터로울러(20)의 구동력에 의하여 용지는 안내판(11)에 밀착한 상태로 이송되어 용지(5)의 선단이 정착기(8)에 인입되면 정착기를 이루는 히팅로울러와 압착로울러의 구동력에 의하여 용지의 선단이 이끌리어져 기기 외부의 배지트레이측으로 반송되어지게 되는 것이다.This is the force between the paper and the metal plate, as in Figure 4.
Figure kpo00001
(F = Coulomb force, K: constant, Q 2 is the amount of charge generated in the paper, Q 1 is the amount of charge generated in the metal plate r = the distance between the paper and the metal plate). The larger the Q2, the larger the electric force, and the paper 5 adheres to the guide plate without increasing the force that adheres to the guide plate 11. In this state, the paper is conveyed in close contact with the guide plate 11 by the driving force of the register roller 20, and the driving force of the heating roller and the pressing roller forming the fuser when the leading end of the paper 5 enters the fuser 8 By the front end of the paper is drawn is to be conveyed to the discharge tray side of the outside of the machine.

상기한 바와 같이 본 발명에 의하면 간단한 구성에 의하여 용지가 낙하하지 않고 이송되므로 기기를 소형화시킬 수 있으며 전력의 소비를 줄일 수 있을 뿐아니라 기기내부에 공기의 유동을 억제하여 항상 선명한 화질을 얻을 수 있으므로 기기의 신뢰성을 향상시킬 수 있게 되는 것이다.As described above, according to the present invention, since the paper is transported without falling by a simple configuration, the device can be miniaturized, power consumption can be reduced, and the flow of air inside the device can be suppressed to always obtain clear picture quality. The reliability of the device can be improved.

Claims (1)

광학계가 감광드럼의 하단에 위치하며 용지가 감광드럼의 상면에서 전사되어 이송되는 레이져 복사기에 있어서, 감광드럼(1)와 정착기(8) 사이에 절연체로 만곡진 가이드리브(10)를 설치하고 상기 가이드리브(10)의 하면에 도전성 물질로 이루어진 안내판(11)을 설치하며 상기 안내판(11)은 접지시킴을 특징으로 하는 레이져 프린터의 용지안내장치.In the laser copier in which the optical system is located at the bottom of the photosensitive drum and the paper is transferred from the upper surface of the photosensitive drum, a guide rib 10 curved with an insulator is installed between the photosensitive drum 1 and the fixing unit 8, and A guide plate (11) made of a conductive material is installed on the lower surface of the guide rib (10) and the guide plate (11) is a paper guide device for a laser printer, characterized in that the grounding.
KR1019890019654A 1989-12-27 1989-12-27 Sheet guiding apparatus for laser printer KR930000489B1 (en)

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KR1019890019654A KR930000489B1 (en) 1989-12-27 1989-12-27 Sheet guiding apparatus for laser printer

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KR1019890019654A KR930000489B1 (en) 1989-12-27 1989-12-27 Sheet guiding apparatus for laser printer

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KR930000489B1 true KR930000489B1 (en) 1993-01-21

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