EP0142917B1 - Elektrophotograhisches Kopiergerät - Google Patents

Elektrophotograhisches Kopiergerät Download PDF

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Publication number
EP0142917B1
EP0142917B1 EP19840306120 EP84306120A EP0142917B1 EP 0142917 B1 EP0142917 B1 EP 0142917B1 EP 19840306120 EP19840306120 EP 19840306120 EP 84306120 A EP84306120 A EP 84306120A EP 0142917 B1 EP0142917 B1 EP 0142917B1
Authority
EP
European Patent Office
Prior art keywords
photosensitive belt
processing means
electrophotographic copier
photosensitive
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19840306120
Other languages
English (en)
French (fr)
Other versions
EP0142917A2 (de
EP0142917A3 (en
Inventor
Yoshihito Urata
Toshiharu Sasaki
Yoshihiro Yokoyama
Yoichi Sekine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0142917A2 publication Critical patent/EP0142917A2/de
Publication of EP0142917A3 publication Critical patent/EP0142917A3/en
Application granted granted Critical
Publication of EP0142917B1 publication Critical patent/EP0142917B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/754—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to band, e.g. tensioning

Definitions

  • the present invention relates to an electrophotographic copier, and more particularly to an electrophotographic copier employing a photosensitive (photoconductive) belt.
  • Electrophotographic copiers generally have a photosensitive drum or belt. No matter which photosensitive body may be used, the photosensitive body and each processing means are generally required to be relatively positioned with sufficient accuracy for achieving high quality of copied images.
  • the density of copied images in a development process is greatly governed by the gap between the photosensitive body and a magnetic roller carrying a developing agent composed of toner and a carrier and also by the gap between the photosensitive body and the wire of a charging or transfer corotron. Furthermore, the distance between an exposure lens and the photosensitive body must accurately be set for producing focused images.
  • photosensitive drums have generally found greater use since they run stably for higher positional accuracies than photosensitive belts.
  • the photosensitive drums still suffer the drawback in that the accuracy of the parts and the accuracy with which each processing means is attached should be kept at a sufficient level for achieving the desired positional accuracies described above.
  • US-A-4183658 discloses a copying apparatus which employs a photoconductive belt and a further belt.
  • the image on the photoconductive belt is transferred to the further belt during processing, and a guided roller and spring arrangement is arranged to urge the photoconductive belt against the further belt during transfer of the image. During transfer the belts are not spaced from each other.
  • the present invention provides an electrophotographic copier comrising:
  • the present invention has the advantage that the gaps between a photosensitive belt and processing means such as development, exposure, and transfer means are established accurately for achieving high image quality.
  • an endless photosensitive (photoconductive) belt 20 is trained around first and second rollers 21, 22 and is driven by a drive mechanism (not shown) to travel counterclockwise.
  • the photosensitive belt 20 is uniformly charged by a corotron 25, and then exposed to light reflected from an original document 30 illuminated by an exposure lamp 27 for forming an electrostatic latent image corresponding to image information of the original document 30 on the photosensitive belt 20. More specifically, a beam of light from the exposure lamp 27 is focused by a reflecting mirror 28 onto the original document 30, and the reflected light from the original document 30 is focused by a fiber lens array 26 onto an exposure guide plate 56 (described later).
  • the electrostatic latent image carried on the photosensitive belt 20 is thereafter converted by a development unit 33 into a visible toner image upon deposition of toner.
  • a cleaning blade 31 (described later) is spaced from the surface of the photosensitive belt 20 by a drive mechanism, not shown.
  • the toner image is transferred by the corotron 25 to a transfer member or a sheet of paper 37 fed by a paper feeder 61.
  • the transfer member 37 carrying the toner image is delivered to a fixing unit 46 in which the toner image is fixed to the transfer member 37. Any residual toner which remains on the photosensitive belt 20 without being transferred to the transfer member 37 is scraped off by the cleaning blade 31 as pressed against the photosensitive belt 20 by the non-illustrated drive mechanism. Subsequently, any residual potential on the photosensitive belt 20 is neutralized by a discharge lamp 32, thereby completing one copying cycle.
  • the exposure guide plate 56 is turnably supported on a shaft 57 and normally urged by a spring 60 to push the photosensitive belt 20, from the reverse side thereof, in a direction toward the fiber lens array 26.
  • the fiber lens array 26 has locating projections 26' which are held in abutment against the exposure guide plate 56 for keeping the fiber lens array 26 spaced a constant distance from the photosensitive belt 20.
  • a transfer guide plate 58 is also turnably supported on a shaft 59 and normally urged by the spring 60 to push the photosensitive belt 20, from the reverse side thereof, in a direction toward the corotron 25.
  • the photosensitive belt 20 remains spaced a constant distance from the corotron 25 by being kept in contact with locating projections 25' on the corotron 25.
  • the exposure guide plate 56 and the transfer guide plate 58 are movable against the reverse side of the endless photosensitive belt 20 toward the fiber lens array 26 which is an exposure means and the corotron 25 which is a transfer means, the gaps between the respective processing means and the photosensitive belt 20 can be maintained accurately as desired.
  • the guide plates 56, 58 are normally urged by the spring 60, the desired accuracy can be kept at all times even if a machine body is twisted when the machine body is moved.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Claims (5)

1. Ein elektrophotographisches Kopiergerät mit:
einem lichtempfindlichen Band (20), das um erste und zweite Rollen (21, 22) gezogen und in einer Richtung angetrieben ist; einer Bearbeitungseinrichtung (25, 26-28, 33), die in gegenüberstehender Stellung in bezug auf die Außenfläche des lichtempfindlichen Bandes angeordnet ist und eine Aufladeeinrichtung (25) zum gleichmäßigen Aufladen des lichtempfindlichen Bandes, eine Belichtungseinrichtung (26-28) zum Belichten des lichtempfindlichen Bandes zur Bildung eines den Bildinformationen eines Original-Schriftstückes (30) entsprechenden elektrostatischen latenten Bildes auf dem lichtempfindlichen Band, eine Entwicklungseinrichtung (33) zur Zufuhr von Toner zum lichtempfindlichen Band zwecks Umwandlung des latentes Bildes in ein Tonerbild und eine Übertragungseinrichtung (25) zum Übertragen des Tonerbildes auf ein Übertragungselement (37) umfaßt; einer Entladungseinrichtung (32) zum Neutralisieren des restlichen elektrischen Potentials auf dem lichtempfindlichen Band; und einer Reinigungseinrichtung (32) zum Entfernen von restlichem Toner vom lichtempfindlichen Band,

gekennzeichnet durch
weiteres Umfassen: einer Festlegungseinrichtung (25', 26'), die an der Bearbeitungseinrichtung (25, 26) vorgesehen ist; einer Führungseinrichtung (58, 56), die an der Stelle, an der das lichtempfindliche Band (20) der Bearbeitungseinrichtung (25, 26) gegenübersteht, im Kontakt mit der Innenfläche des lichtempfindlichen Bandes (20) gehalten ist, und einer Beaufschlagungseinrichtung (60) zum Beaufschlagen der Führungseinrichtung (58, 56) in Richtung der Bearbeitungseinrichtung (25, 26), so daß die Führungseinrichtung (58, 56) anstoßend an die Festlegungseinrichtung (25', 26') gehalten ist, um dadurch das lichtempfindliche Band (20) und die Bearbeitungseinrichtung (25, 26) in beabstandeter Stellung relativ zueinander mit einem konstanten Abstand dazwischen zu halten.
2. Ein elektrophotographisches Kopiergerät nach Anspruch 1, in welchem die genannten Rollen (21, 22) ein Paar Antriebs- und angetriebener Rollen (21, 22) umfassen und die genannte Führungseinrichtung (56, 58) ein gebogenes Element (56, 58) aufweist, das gegen das genannte lichtempfindliche Band (20) gehalten ist.
3. Ein elektrophotographisches Kopiergerät nach Anspruch 2, in welchem das genannte gebogene Element (56,58) einen Abschnitt umfaßt, der eine Rückseite des genannten lichtempfindlichen Bandes (20) berührt und einen Krümmungsradius aufweist, der größer ist als die Radien der genannten Rollen (21, 22).
4. Ein elektrophotographisches Kopiergerät nach Anspruch 1, in welchem die genannte Festlegungseinrichtung (26', 25') an den Enden der genannten Bearbeitungseinrichtung (25, 26) quer zum genannten lichtempfindlichen Band (20) angeordnet ist und zum Einstellen des konstanten Abstandes zwischen der genannten Bearbeitungseinrichtung (25, 26) und-dem genannten lichtempfindlichen Band (20) unabhängig verlagerbar ist.
5. Ein elektrophotographisches Kopiergerät nach wenigstens einem vorhergehenden Anspruch, in welchem die genannte Führungseinrichtung Vorsprünge aufweist, die sich quer über querverlaufende Kanten des genannten lichtempfindlichen Bandes außer Kontakt mit demselben erstrecken und gegen die genannte Festlegungseinrichtung der genannten Bearbeitungseinrichtung gehalten sind.
EP19840306120 1983-10-24 1984-09-07 Elektrophotograhisches Kopiergerät Expired EP0142917B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP198526/83 1983-10-24
JP58198526A JPS6090350A (ja) 1983-10-24 1983-10-24 複写機

Publications (3)

Publication Number Publication Date
EP0142917A2 EP0142917A2 (de) 1985-05-29
EP0142917A3 EP0142917A3 (en) 1985-07-10
EP0142917B1 true EP0142917B1 (de) 1989-07-05

Family

ID=16392604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840306120 Expired EP0142917B1 (de) 1983-10-24 1984-09-07 Elektrophotograhisches Kopiergerät

Country Status (3)

Country Link
EP (1) EP0142917B1 (de)
JP (1) JPS6090350A (de)
DE (1) DE3478880D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2577904B2 (ja) * 1987-04-04 1997-02-05 株式会社リコー 画像形成装置
US4806991A (en) * 1987-12-21 1989-02-21 Eastman Kodak Company Mechanism for locating a flexible photoconductor relative to a development station
US4797703A (en) * 1987-12-21 1989-01-10 Eastman Kodak Company Mechanism for locating a flexible photoconductor relative to a plurality of development stations
US5168318A (en) * 1989-10-18 1992-12-01 Konica Corporation Color image forming apparatus having a predetermined space maintained between a photosensitive belt and developing devices

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245311A (en) * 1963-07-29 1966-04-12 Xerox Corp Document conveyor
US3974952A (en) * 1974-09-10 1976-08-17 Eastman Kodak Company Web tracking apparatus
DE2636326C3 (de) * 1976-08-12 1979-02-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Vorrichtung zum An- und Abschwenken eines Aufzeichnungsträgers zu und von einem Zwischenträger
NL185691C (nl) * 1977-08-29 1990-06-18 Oce Van Der Grinten Nv Kopieerapparaat.
JPS5724981A (en) * 1980-07-23 1982-02-09 Ricoh Co Ltd Developing device

Also Published As

Publication number Publication date
JPS6090350A (ja) 1985-05-21
EP0142917A2 (de) 1985-05-29
DE3478880D1 (en) 1989-08-10
EP0142917A3 (en) 1985-07-10

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