[특허]Electrophotographic apparatus

Ricoh Printing Systems, Ltd.

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특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Electrophotographic apparatus

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G03G-015/00
미국특허분류(USC)	399/400; 399/401; 399/397; 399/388
출원번호	US-0730112 (2003-12-09)
우선권정보	JP-0204997 (2003-07-31)
발명자 / 주소	Yamashita, Taichiro Miyasaka, Toru Yagi, Masahiro Yamada, Shintaro Asuwa, Kenji
출원인 / 주소	Ricoh Printing Systems, Ltd.
대리인 / 주소	Antonelli, Terry, Stout &
인용정보	피인용 횟수 : 6 인용 특허 : 9

초록
▼

Provided is a small-sized electrophotographic apparatus having a double face printing function, which can print at a high speed even during double face printing. There are provided a recording medium conveying path 5 composed of a vertical conveying path 5a for upward conveying a sheet fed from a sheet cassette 2, outside of a developing means 60, a curved conveying path 5b and horizontal conveying path 5c for conveying the recording medium to a transfer means 50, a fusing means 51 located in the horizontal conveying path 5c, downstream of the transfer means 50, for fusing a toner image on the recording medium 2, a sheet discharge tray 53, a bypass conveying path for guiding a sheet to be subjected to double face printing, having one surface for which printing has been completed, a first branch means 58 for guiding the sheet to be subjected to double face printing from a conveying path for the sheet discharge tray 53 into the bypass conveying path 56, a reversing conveying path 54 for reversing the sheet conveyed in the bypass conveying path 54 during double face printing, a second branch means 59 for guiding the sheet which has been reversed in the reversing conveying path 54, into the horizontal conveying path 5c, and a return conveying path 57 for returning the sheet which has passed through the second branch means 59, into the return conveying path 57 for conveying the sheet to the horizontal conveying path.

대표
청구항
▼

1. An electrophotographic apparatus comprising a plurality of image forming means each including a photoconductive drum having a photoconductive layer, an exposure means for forming an electrostatic latent image on the photoconductive layer of the photoconductive drum, and a developing means for causing toner to stick to the latent image on the photoconductive drum so as to form a toner image, an endless intermediate transfer belt rotated around and stretched between a drive roller and a driven roller, a second transfer means located above a row of the photoconductive drums, for transferring a toner image from the intermediate transfer belt onto a recording medium, toner images formed on the plurality of photoconductive drums being transferred onto the recording medium through the intermediary of the intermediate transfer belt so as to form a color image thereon, a recording medium supply path composed of a vertical conveying path for conveying a recording medium fed from a sheet cassette in which recording mediums are accommodated, upward outside of the developing means, a curved conveying path, a horizontal conveying path for conveying the recording medium, in a substantially horizontal direction, to the second transfer means, a fusing means located on the horizontal conveying path, downstream of the transfer means, for fusing the transferred toner image on the recording medium, a discharge tray for stacking therein recording mediums for which printing is completed, and which are discharged, a bypass conveying path for conveying a recording medium to be subjected to double face printing, for which printing has been made on one side surface thereof, a first branch means for guiding the recording medium to be subjected to double face printing from the conveying path for the discharge tray, onto the bypass conveying path, a reversing conveying path for reversing the recording medium conveyed on the bypass conveying path during double face printing, a second branching means for guiding the recording medium reversed in the reversing conveying path from the bypass conveying path onto the horizontal conveying path during double face printing, and a return conveying path for conveying the recording medium which has passed through the second branch means onto the horizontal conveying path.2. An electrophotographic apparatus as set forth in claim 1, wherein only the vertical conveying path and the reversing conveying path are laid in substantially parallel with each other in an opening door at the front surface of the electrophotographic apparatus.3. An electrophotographic apparatus as set forth in claim 1 or 2, wherein conveying rollers for driving a recording medium which is inserted into the reversing conveying path and is then fed out, are provided on the body side of the electrophotographic apparatus so as to define the reversing conveying path as a mere hollow space.4. An electrophotographic apparatus as set forth in claim 2, wherein the opening door has a mechanism for opening the door along the vertical conveying path.5. An electrophotographic apparatus as set forth in claim 1 or 2, wherein a casing upper part which is opened along the curved conveying path and the horizontal conveying path is provided.6. An electrophotographic apparatus as set forth in claim 5, wherein a mechanism for opening the casing upper part along the bypass conveying path is provided.7. An electrophotographic apparatus as set forth in claim 1 or 2, wherein a manual sheet feed tray is provided on a substantial extension of the return conveying path.8. An electrophotographic apparatus as set forth in claim 1 or 2, wherein the following relationships are satisfied:L1 >(2 ×Pmax +Gap) L2>Pmax where L1 is a length from the looping route which comes out from and returns to the second branch means on the bypass path, by way of the second transfer means on the horizontal path, the fusing means, the first branch means and the bypass path, L2 is a length of the reversing conveying path which extends from the second branch means to a position in the vicinity of the sheet cassette, Pmax is a maximum length of a recording medium, and Gap is intervals of recording mediums to be conveyed.9. An electrophotographic apparatus as set forth in claim 8, wherein the return conveying path from the second branch means is formed in an S-like shape.10. An electrophotographic apparatus as set forth in claim 1 or 2, wherein the following relationships are satisfied:L1 >(2 ×Pmax +Gap) L2>Pmax where L1 is a length from the looping route which comes out from and returns to the second branch means on the bypass path, by way of the second transfer means on the horizontal path, the fusing means, the first branch means and the bypass path, L2 is a length of the reversing conveying path which extends from the second branch means to a position in the vicinity of the sheet cassette, Pmax a maximum length of a recording medium, and Gap is intervals of recording mediums to be conveyed.11. An electrophotographic apparatus as set forth in claim 1 wherein the second branch means incorporate a stepped part for guiding the leading end of a recording medium fed from the reversing conveying path onto the return conveying path.12. An electrophotographic apparatus as set forth in claim 1, wherein the second branch means incorporates a branch assist member for guiding the leading end of a recording medium fed out from the reversing conveying path onto the return conveying path, which is lifted by the recording medium when the recording medium is fed from the bypass conveying path onto reversing conveying path, but naturally drops under gravity when the recoding medium is fed from the reversing conveying path onto the return conveying path.13. An electrophotographic apparatus as set forth in claim 11 or 12, wherein there is provided a recording medium detecting means for detecting the presence of a recording medium on the conveying path from the second branch means to the reversing conveying path so as to determine an operation timing of a recording medium driving mechanism associated with the reversing conveying path.

이 특허에 인용된 특허 (9)

이 특허를 인용한 특허 피인용횟수: 6

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구성항목	관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
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특허 상세정보

Electrophotographic apparatus

초록
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청구항
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이 특허에 인용된 특허 (9)

이 특허를 인용한 특허 피인용횟수: 6

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특허 상세정보

Electrophotographic apparatus

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이 특허에 인용된 특허 (9)

이 특허를 인용한 특허 피인용횟수: 6

IPC 상위 출원인

과제정보

상세정보조회

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IPC 상세정보(version : 201201)

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