EP0126353B1 - Dispositif de transport - Google Patents

Dispositif de transport Download PDF

Info

Publication number
EP0126353B1
EP0126353B1 EP84105040A EP84105040A EP0126353B1 EP 0126353 B1 EP0126353 B1 EP 0126353B1 EP 84105040 A EP84105040 A EP 84105040A EP 84105040 A EP84105040 A EP 84105040A EP 0126353 B1 EP0126353 B1 EP 0126353B1
Authority
EP
European Patent Office
Prior art keywords
rollers
delivery rollers
transporting device
roller
upper delivery
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
EP84105040A
Other languages
German (de)
English (en)
Other versions
EP0126353A1 (fr
Inventor
Roland Dr. Moraw
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of EP0126353A1 publication Critical patent/EP0126353A1/fr
Application granted granted Critical
Publication of EP0126353B1 publication Critical patent/EP0126353B1/fr
Expired legal-status Critical Current

Links

Images

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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • 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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • 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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat

Definitions

  • the invention relates to a transport device for copies which are transported from a thermal fixing device to a copy storage platform in a copying machine, with a curved heating surface, along which the copy sheet with the liquid-developed toner image is moved by a guide roller inside the fixing device, with discharge rollers which do this Detect the copy sheet emerging from the fixing device and convey it further.
  • the transport device is particularly suitable for electrophotographic copiers in which a charge image is generated on a photoconductor layer and is developed with developer liquid through deposited pigments to form a toner image.
  • the toner image is transferred to a copy carrier such as paper.
  • the developer-moist copy carrier with the toner image is guided over a heating device for fixing.
  • DE-A-25 39 642 discloses a device for fixing a toner image by means of heat in an electrophotographic copier working with a wet developer.
  • a heating device is arranged in the fixing device, along which the wet-developed copy sheet with the toner image is moved on its surface.
  • the heating device has a curved heating surface, against which the back of the copy sheet rests and slides along in order to fix the toner image by means of heat.
  • the heating surface is curved in one area.
  • a guide roller At a short distance from the heating surface is a guide roller which is brought into contact with the surface of the sheet carrying the toner image in order to guide and introduce it to the curved surface area of the heating surface.
  • the peripheral surface of the guide roller is knurled and arranged at a distance from the curved or curved surface area of the heating surface that is greater than the sheet thickness.
  • the knurled surface of the guide roller reduces the influence or the effect on the toner image, since this reduces the contact area with the copy sheet, but this reduction in the contact area is not yet sufficient to fully prevent an offset phenomenon which occurs during of the fixing process using heat.
  • the knurled surface of the guide roller primarily causes the front end of the copy sheet to be brought into contact with the curved heating surface, even if the front end introduced into the copier is bent up or rolled up.
  • the distance between the peripheral surface of the guide roller and the heating surface in this known copying machine is of the order of magnitude of 0.5 to 1 mm if the thickness of the copy sheet is approximately 0.1 mm.
  • the guide roller extends in this fixing device approximately over the format width of the copy sheet.
  • US-A-4 377 229 describes a stationary, narrow guide roller which bears against the front side of a copy sheet to be transported by a copying machine near the edge region in which no charge or toner image is produced. The entire width of the copy sheet rests on a driven transport roller. An adjustment of the guide roller is not provided, so that it is impossible to adapt its position to different sheet formats.
  • Electrophotographic copiers with liquid development have found widespread use because they are able to achieve good, area-wide blackening in the full-tone areas by sufficient separation of toner pigment.
  • To achieve a wipe-proof fixation the complete evaporation of the dispersing liquid carried on the copies, in which the toner pigment is dispersed, is required.
  • Isopar G an isoaliphatic hydrocarbon, which boils at about 164 ° C., is generally provided as the dispersing liquid.
  • transport rollers in the output gap can remove toner from the image spots that have not yet been smudge-fixed and transfer them to non-image areas of the copy or a subsequent copy, thereby transferring them pollute.
  • the object of the invention is to improve a transport device of the type described above so that the output of a liquid-developed copy sheet from the fixing device without the offset effect of the toner image, which has not yet been fixed against smudging, through the output rollers and the copy sheet is stacked on the copy storage platform without contamination.
  • upper and lower output rollers are provided, of which the two outer, upper output rollers have an adjustable distance from one another which is dependent on the format width of the copy sheet, in that this distance of the upper output rollers is 10 to 30 mm shorter than that selected format width of the copy sheet is transverse to the transport direction and that the two outer, upper output rollers are arranged in the edge regions of the copies being transported.
  • one of the upper output rollers is slidably arranged along a common shaft of the output rollers and the other upper output roller is arranged in a stationary manner and markings for the positions of this movable output roller corresponding to the predetermined format widths of the copy sheet are provided on the shaft.
  • three upper discharge rollers are arranged in a fixed position on a common shaft.
  • the upper dispensing rollers preferably have small contact areas compared to the lower dispensing rollers. This is achieved because the upper delivery rollers are double star rollers, each consisting of two star-shaped disks rotated against each other.
  • the upper dispensing rollers are disc rollers which have a roller sleeve which is connected to a serrated toothed disc and has a smaller diameter than the standing disc.
  • the lower output rolls are expediently seated on a shaft, distributed over the full width of the format.
  • at least one upper output roller is arranged in each of the two edge areas of a copy sheet, which are up to 15 mm.
  • the output technology is made as simple as possible in this way, so that a quick retrofitting of the transport device of existing copying machines is possible by replacing the previous upper output rollers, which extend over the format of the copy sheet, with the rollers according to the invention.
  • the proposed transport device still achieves a perfect copy output if the copies in the output nip are only transported by output rollers at the edge of the sheet.
  • the marginal zones are free of information, so that the copies can be guided there safely and without toner transfer.
  • the special design of the output rollers ensures that the copy sheet is guided securely through the output nip.
  • Such a construction is not only complex, but also makes it difficult to remove a stuck paper sheet in the event of a paper jam due to the compact construction from so many components, in comparison to the simple output device according to the invention.
  • FIG. 1 A side view of a fixing station and transport device is shown in FIG. 1, its structure largely corresponds to the device known from DE-A-25 39 642.
  • a copy sheet 1 coming from the development station (not shown) with the moist toner image pointing upwards is fed from feed rollers 2 and 3 to a curved heating plate 4 which contains heating rods 5 embedded on the underside.
  • the heating plate 4 is set to operating temperatures of about 200 ° C.
  • the copy sheet 1 is guided by a pressure roller 6 along the curved heating plate.
  • the fixing gap between the pressure roller 6 and the heating plate 4 is between 0.3 mm and 0.5 mm, while in the known device according to DE-OS 25 39 642 it is 0.5 to 1.0 mm.
  • the pressure roller 6 is structured on the surface in order to only touch the copy sheet in a punctiform manner.
  • the surface of the pressure roller 6 can be knurled or covered with a fabric made of plush or bristles.
  • a cleaning roller 7 with a soft surface made of felt or rubber-like material lies against the pressure roller 6 and runs with it.
  • the largely dried, heated copy is picked up by output rollers 8 and 9 of the transport device in the output nip and transported to a storage platform, not shown. All rollers and rollers run synchronously.
  • the lower rollers 9 are driven, for example, and consist of a material with high friction such as rubber.
  • the upper rollers 8 rest on the top of the copy sheet 1 and are structured on the surface.
  • the discharge rollers 8 are installed only in positions corresponding to the sheet edges and are not distributed over the entire width of the copy sheet, as is customary in the prior art.
  • Commercial copying machines of the type described contain, for example, up to five output rollers arranged one behind the other in the transport direction and just as many across the format width transversely to the transport direction on one axis.
  • FIG. 2 The front view of the transport device according to the invention is shown in FIG. 2.
  • the copying plate 1 with the toner image pointing upwards is only guided in the edge regions by an output roller 8 or 8 "in each case.
  • Such output rollers for example with a knurled or differently structured surface, are up to in practice about seven, preferably five millimeters thick and thus have a very small contact area compared to the lower delivery rollers 9, 9, ....
  • the description of the invention is based on the design of a fixing station and a transport device for copy output, but the invention as such is not limited to this design.
  • A4 copies with a width of 210 mm are, for example, placed on the filing platform with a lateral offset, depending on the type of paper, not larger than ⁇ 2 mm to ⁇ 4.5 mm, so that subsequent processing of the copies, such as the feed to a Sorting device is possible without difficulty.
  • Slides are also output without problems.
  • the invention also includes the possibility of providing several, for example two, rolls as a double roll in close proximity to one another instead of an output roll 8 for even more secure paper guidance in the information-free edge region of the copy sheet.
  • the edge areas are free of information at least over 5 mm wide, but generally up to a width of 15 mm and above without information.
  • the transport device is particularly suitable in connection with a narrower fixing gap between the heating plate 4 and the pressure roller 6 than is to be regarded as the state of the art according to the information in DE-A-25 39 642.
  • the fixing gap according to the invention is between 0.3 mm and 0.5 mm.
  • guides 10, 10 ', 10" can be provided in the vicinity of the discharge rollers 8, 8', 8 ", as can be seen from FIGS. 2 and 3.
  • These guides are, for example, webs with a height of 2 to 3 mm, which are curved and protrude on the inside of housing walls (not shown) in the direction of the end faces of the upper output rollers 8, 8 ', 8 ".
  • These guides prevent the copy sheet from rolling up before it enters the discharge nip of the upper and lower discharge rollers 8, 8 "and 9.
  • copiers which only output copies of a width, for example A4 landscape or A4 longitudinal.
  • copiers allow you to choose between two or more formats of comies, such as between A4 or B4 format.
  • the transport device for copy output can be successfully used by output rollers which are arranged in the edge regions of the selected copy format widths.
  • the copy format width II is larger than the copy format width I
  • a further roll 8 'then runs to the two outer output rolls 8, 8 "at the edge of the smaller format width.
  • the suppression of the toner transfer over the entire copy width is good despite the further roller 8'.
  • the distances A, B between the output rollers 8 ′, 8 ′′ or 8, 8 ′′ interacting in pairs are each 10 to 30 mm shorter than the selected copy format width I or 11 of the copy sheet 1 in the transport direction.
  • all three dispensing rollers 8, 8 ', 8 are fixed in place on the outer shaft 12, but one of the dispensing rollers 8, 8", preferably the left roller 8 in the front view, can also be moved on the Sit on shaft 12 when e.g. B. the transport device is designed for three different copy format widths. It is also possible, in the embodiment according to FIG. 2, to arrange both dispensing rollers 8, 8 ′′ stationary or one of them to be displaceable on the shaft 12.
  • the lower delivery rollers 9, 9, ... are at each embodiment on a common shaft 11, distributed over the full format width, on.
  • rollers with an extremely small contact area have proven to be very effective in reducing the toner transfer through the discharge rollers, for example disc rollers 15, which consist of a roller sleeve 16 and an associated serrated edge disk 17, the diameter of the edge disk being larger than that of the roller sleeve (Fig 4).
  • FIG. 5 shows a further embodiment of the delivery rollers made of two star-shaped disks 13, 13 'which are rotated relative to one another.
  • these double star rollers 14 result in a track of fine dots offset against one another, which, however, since the track does not represent a closed line, can hardly be recognized on the copy sheet.
  • a single, dot-shaped toner print was rarely found.
  • the middle output roller 8 ' can be omitted for variable copy format widths if one of the two output rollers 8, 8 "on the shaft 12 is shifted in accordance with the respective copy format widths.
  • markings 18, 18' on the shaft 12 for the respective positions of the output rollers 8, 8 'according to the selected formats of the copy sheets the adjustment of the slidable roll is facilitated.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Fixing For Electrophotography (AREA)

Claims (8)

1. Dispositif pour le transport de copies, qui sont entraînées d'un poste de fixage thermique à un poste d'empilage d'un copieur comportant une surface de chauffage courbe le long de laquelle une feuille de copie portant une image de particules d'un développateur liquide est déplacée à l'aide d'un rouleau de guidage dans le poste de fixage, et comportant des rouleaux de sortie qui saisissent et poursuivent l'entraînement de la feuille de copie sortant du poste de fixage, caractérisé en ce qu'il comprend des rouleaux de sortie supérieurs et inférieurs (8, 8', 8", 9), où les deux rouleaux de sortie supérieurs extérieurs (8, 8") sont à une distance mutuelle réglable (A, B) fonction de la largeur du format de la feuille de copie (1) et où cette distance (A, B) entre les rouleaux de sortie supérieurs (8, 8"; 8', 8") est plus courte, de 10 à 30 mm, que la largeur choisie du format de la feuille de copie (1) transversalement à la direction de transport et en ce que les deux rouleaux de sortie supérieùrs extérieurs (8, 8") sont disposés dans les zones marginales des copies transportées.
2. Dispositif de transport selon la revendication 1, caractérisé en ce qu'un (8) des rouleaux de sortie supérieurs est déplaçable le long d'un arbre commun (12) des rouleaux de sortie et l'autre rouleau de sortie supérieur (8") est monté fixe et en ce que des marques (18, 18') pour des positions de ce rouleau de sortie déplaçable correspondant à des largeurs prédéterminées de formats de feuille de copie, sont portées sur l'arbre (12).
3. Dispositif de transport selon la revendication 1, caractérisé en ce que trois rouleaux de sortie supérieurs (8, 8', 8") sont montés fixes sur un arbre commun (12).
4. Dispositif de transport selon les revendications 1 à 3, caractérisé en ce que les rouleaux de sortie supérieurs (8, 8', 8") présentent des surfaces de contact, qui sont petites relativement à celles des rouleaux de sortie inférieurs (9, 9,...).
5. Dispositif de transport selon la revendication 4, caractérisé en ce que les rouleaux de sortie supérieurs (8, 8', 8") ont une configuration en étoiles doubles (14), constituées chacune par deux disques en étoiles (13, 13'), décalés angulairement l'un par rapport à l'autre.
6. Dispositif de transport suivant la revendication 4, caractérisé en ce que les rouleaux de sortie supérieurs (8, 8', 8") sont des rouleaux à disques (15), constitués chacun d'un manchon de rouleau (16) auquel est relié un disque marginal dentelé (17) d'un diamètre supérieur à celui du manchon.
7. Dispositif de transport selon les revendications 1 à 6, caractérisé en ce que les rouleaux de sortie inférieurs (9, 9,...) sont montés fixes sur un arbre (11) et répartis suivant la totalité de la dimension du format.
8. Dispositif de transport selon la revendication 4, caractérisé en ce que la largeur des surfaces de contact des rouleaux de sortie supérieurs (8, 8', 8") possède une valeur pouvant atteindre 7 mm.
EP84105040A 1983-05-13 1984-05-04 Dispositif de transport Expired EP0126353B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3317416 1983-05-13
DE19833317416 DE3317416A1 (de) 1983-05-13 1983-05-13 Transportvorrichtung

Publications (2)

Publication Number Publication Date
EP0126353A1 EP0126353A1 (fr) 1984-11-28
EP0126353B1 true EP0126353B1 (fr) 1987-09-23

Family

ID=6198872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105040A Expired EP0126353B1 (fr) 1983-05-13 1984-05-04 Dispositif de transport

Country Status (3)

Country Link
EP (1) EP0126353B1 (fr)
JP (1) JPS59219759A (fr)
DE (2) DE3317416A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10135788B4 (de) * 2000-12-22 2004-02-05 Nexpress Solutions Llc Digitale Druck- oder Kopiermaschine und Verfahren zum Fixieren von Toner auf einem Substrat
US6608986B2 (en) 2000-12-22 2003-08-19 Nexpress Solutions Llc Digital printing or copying machine and process for fixing a toner on a substrate

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942765A (en) * 1956-05-24 1960-06-28 Mercury Engineering Corp Carton blank feeding mechanism
US3860232A (en) * 1971-07-08 1975-01-14 Merrill David Martin Adjustable stacker layboy
GB2018199B (en) * 1978-03-15 1982-04-28 Canon Kk Heat-fixing device
US4377229A (en) * 1979-09-28 1983-03-22 Olympus Optical Company Ltd. Apparatus for conveying copy sheet for electrophotographic copying machine

Also Published As

Publication number Publication date
JPS59219759A (ja) 1984-12-11
DE3317416A1 (de) 1984-11-15
EP0126353A1 (fr) 1984-11-28
DE3466443D1 (en) 1987-10-29

Similar Documents

Publication Publication Date Title
DE69218601T2 (de) Photographisches behandlungsgerät
DE2950516C2 (de) Elektrophotographisches Kopiergerät
DE3910459C2 (fr)
DE3689421T2 (de) Vervielfältigungsgerät.
DE3838112A1 (de) Vorrichtung zur papierkruemmungsbeseitigung bei aus einer druckmaschine austretenden papierboegen
DE3409778C2 (de) Fixiereinrichtung für Tonerbilder
DE4032290A1 (de) Bilderzeugendes geraet
DE3117296C2 (de) Entwicklerstation zur Entwicklung von auf einem Ladungsbildträger erzeugten Ladungsbilder
DE2912648C2 (fr)
DE3107768A1 (de) Papierstapeleinrichtung
DE3922647A1 (de) Vorrichtung zur papierkruemmungsbeseitigung bei papiermaterial
DE3836617C2 (fr)
DE2815063A1 (de) Blattfoerdereinrichtung in einem kopierer
DE2702110A1 (de) Bilduebertragungs-zusatzvorrichtung fuer ein elektrophotographisches kopiergeraet
DE68910141T2 (de) Fixiergerät.
DE2701268A1 (de) Blattwendevorrichtung und -verfahren
DE3102293A1 (de) Optisches kopiergeraet
DE2360885A1 (de) Kopiergeraet
DE3812513C2 (fr)
DE2617682B2 (de) Reinigungsvorrichtung zum Reinigen der Oberfläche einer Andrückrolle in einer Rollenfixiereinrichtung
DE3941315A1 (de) Vorrichtung zum vermeiden einer schieflage geschnittener papierbogen
DE3918961C2 (de) Elektrofotografisches Druck- oder Kopiergerät
DE3433665A1 (de) Ablenker zur beseitigung von stauungen
DE3341413A1 (de) Kopiervorrichtung zum doppelseitigen kopieren
DE3314153C2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT NL

17P Request for examination filed

Effective date: 19850415

17Q First examination report despatched

Effective date: 19860709

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19870923

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19870923

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19870923

Ref country code: BE

Effective date: 19870923

REF Corresponds to:

Ref document number: 3466443

Country of ref document: DE

Date of ref document: 19871029

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881122

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19890201