EP0404769B1 - Dispositif de lissage de feuilles individuelles dans des machines d'impression et de reproduction non mecaniques - Google Patents

Dispositif de lissage de feuilles individuelles dans des machines d'impression et de reproduction non mecaniques Download PDF

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Publication number
EP0404769B1
EP0404769B1 EP88905355A EP88905355A EP0404769B1 EP 0404769 B1 EP0404769 B1 EP 0404769B1 EP 88905355 A EP88905355 A EP 88905355A EP 88905355 A EP88905355 A EP 88905355A EP 0404769 B1 EP0404769 B1 EP 0404769B1
Authority
EP
European Patent Office
Prior art keywords
recording medium
fusing
paper guide
fixing
paper
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 - Lifetime
Application number
EP88905355A
Other languages
German (de)
English (en)
Other versions
EP0404769A1 (fr
Inventor
Hans Manzer
Rudolf Seeberger
Gerhard Klapettek
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Wincor Nixdorf International GmbH
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 Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Publication of EP0404769A1 publication Critical patent/EP0404769A1/fr
Application granted granted Critical
Publication of EP0404769B1 publication Critical patent/EP0404769B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/6573—Feeding path after the fixing point and up to the discharge tray or the finisher, e.g. special treatment of copy material to compensate for effects from the fixing
    • G03G15/6576—Decurling of sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs
    • 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
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The 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"
    • G03G2215/00417—Post-fixing device
    • G03G2215/00421—Discharging tray, e.g. devices stabilising the quality of the copy medium, postfixing-treatment, inverting, sorting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The 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"
    • G03G2215/00417—Post-fixing device
    • G03G2215/0043—Refeeding path
    • G03G2215/00438—Inverter of refeeding path
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00662—Decurling device

Definitions

  • the invention relates to a non-mechanical printing or copying device according to claim 1.
  • Non-mechanical printing devices or copying devices that work according to the electrostatic principle are generally known and have been used successfully.
  • toner images of the characters to be printed are generated on a recording medium, for example a paper web.
  • a recording medium for example a paper web.
  • charge images are generated electrophotographically or electrographically on a photoconductive, dielectric recording material, for example a drum.
  • These charge images are developed in a development station with the aid of usually two-component toners, consisting of the actual, color-forming toner particles and ferromagnetic carrier particles.
  • the images are then transferred in a transfer station to an image receiving material as the final recording medium. In order to make the toner images smudge-free, they must then be melted into the recording medium in a fixing station.
  • Fixing stations through which the toner images are melted into the recording medium are already known (US Pat. No. 3,861,863).
  • the record carrier runs between two fixing rollers, at least one of which is heated and which form a fixing gap.
  • a device for heating the recording medium in the form of a so-called preheating saddle can also be arranged upstream of the fixing rollers.
  • the recording medium In the fixing nip, the recording medium is heated to a temperature of typically 100 ° C. to 120 ° C. under high pressure and the toner particles are melted into the recording medium.
  • the curvature remaining in the recording medium is strongly dependent on the geometry of the paper guide immediately after leaving the fixing gap.
  • a curvature or curvature of the record carrier leads to increased transport problems in the further course of the record carrier path. In particular in the case of duplex operation of the printing device, in which printing on the record carrier is possible on both sides, this results in increased stripping problems on the electrophotographic intermediate image carrier and deviations in assignment between print information and record carrier.
  • the single sheet removed from a storage container in the printing channel of the printing device is first printed on the front side in duplex mode, then returned via a return channel to the input of the printing channel and turned in a turning device located there. After feeding the print channel again, the back of the single sheet is printed. The single sheet is then placed in an output tray via an output channel.
  • one or more sheets are continuously fed to the printing channel and the return device.
  • the control of the printer then assigns the corresponding print image to the corresponding front and back pages of the single sheets.
  • the correct sequence for the delivery or filing is ensured that all sheets to be printed are guided over the print channel and the return channel including the turning device.
  • Page printers with single sheet operation are relatively complicated in terms of paper transport, and the required tolerances in the paper channel are small. Since such page printers are in use around the clock with shift speeds of 50 pages per minute or more around the clock, disruptions in paper transport, such as those caused by the bulges stamped on the individual sheets in the fixing gap, have a particularly disadvantageous effect.
  • a smoothing device is known in connection with a fixing device, in which the position of a pressure roller is offset from the position of the fixing device in order to eliminate curvatures in the recording medium.
  • the object of the invention is therefore to develop a non-mechanical printing or copying device of the type mentioned in such a way that after completion of the actual printing process there is a flat recording medium free of bulges for further transport.
  • curved recording media e.g. curved single sheets can be brought back into a straight shape in non-mechanical printing devices if they are deformed in the plastic area.
  • the recording media are easily freed from bulges and curvatures, so that the recording media can be passed on and stored after leaving the smoothing device without transport problems.
  • the geometric configuration of the paper guide elements forming the paper guide channel ensures that the recording medium is first curved in the direction of rotation of the fixing roller immediately after leaving the fixing gap and then bent back in the opposite direction to this curvature.
  • the deflection of the recording medium in the direction of rotation of the fixing roller can be achieved particularly easily by tapering the paper guide channel immediately after the fixing gap, so that the recording medium is curved upward with respect to the fixing gap.
  • the recording medium previously deflected and curved in the direction of rotation of the fixing roller is then curved in the opposite direction, and on the other hand, such a strongly curved deflection results in a small space requirement for the entire smoothing device.
  • the paper storage containers V1, V2 and V3 are constructed in the usual way and have a motor-driven base plate 10 which can be displaced in the direction of the arrow in accordance with the paper supply.
  • a paper stack arranged in the paper storage container is raised in accordance with the consumption of the paper, so that the uppermost single sheet of the paper stack can always be pulled off the paper stack via paper transport elements P1, P2 and P3.
  • the paper storage containers V1, V2, V3 are connected via paper feed channels 11 to a pressure channel DK of the printing device.
  • the pressure channel DK contains the actual printing station DS with a photoconductor drum 12 serving as an intermediate carrier, an exposure station 13 with an LED comb (not shown here) which can be controlled depending on the character, a developer station 14, a transfer printing station 15 and a cleaning station 16. Furthermore, the printing channel DK contains paper transport elements in the form of a belt-shaped rotating suction table S and on the input side a paper alignment device PA2 and a fixing station F made of electrically heated heating rollers which are driven by an electric motor and which thermally fix a toner image printed on a recording medium (single sheet) in a known manner.
  • the return channel RF also has a turning device W1, in which the single sheets are turned in the so-called duplex mode before being fed back to the printing channel DK.
  • the pressure channel DK is followed by a paper transport channel system with a separate duplex channel DUK and a separate simplex channel SK, which open into a common output channel AK.
  • the single sheets printed on both sides are transported in the duplex channel DUK, the single sheets printed on one side in the simplex channel SK.
  • the duplex or simplex channel is controlled via a switch PW2.
  • the simplex channel SK is designed as an elongated paper channel with paper transport elements arranged therein. It can hold up to three single sheets in a row and serves as a storage channel.
  • At the end of the duplex channel DUK there is another turning device W2. This turning device W2 connects the duplex channel DUK with the output channel AK.
  • the output channel AK has switches PW3 and PW4 that guide the single sheets into two storage containers AB1 and AB2.
  • a waste container AF (copy tray) that can be controlled via the switch PW4 is also provided.
  • all paper channels have paper scanning sensors (shown as black triangles), which consist of light barriers and continuously monitor the paper flow.
  • paper alignment devices PA1 to PA3 are also arranged, which serve to align the individual sheets removed from the storage containers V1 to V3 in the correct position before printing in the pressure channel DK and in the aligned form Feeding station DS.
  • All paper transport elements P are driven, including the fixing station F and the photoconductor drum 12 via two motors M1 and M2.
  • the motor M1 drives the paper transport elements in the pressure channel DK and in the input area
  • the motor M2 the paper transport elements in the return channel RF, in the duplex channel DUK, in the simplex channel SK and in the output channel AK.
  • All paper transport elements (pairs of paper rolls P) have electrically controllable clutches, for example spring band clutches, and are connected to the two assigned motors M1 or M2 via toothed belts, which are not shown here for reasons of clarity.
  • smoothing devices G1, G2 are provided for smoothing the single sheets for the single-sheet page printer according to FIG. 1. It is sufficient to arrange one of the two smoothing devices G1 or G2 for a smooth transport of the single sheets.
  • the smoothing device G1 shown schematically in FIG. 2 is combined with the fixing station F and interacts with it in the manner shown below.
  • the fixing station F contains a fixing roller 1 driven by the motor M1 and a pressure roller 2. Of the rollers 1, 2, at least the fixing roller 1 is heated. For this purpose, one or more heating sources 6 are arranged inside the fixing roller 1.
  • the paper pressure roller 2 does not have to be heated, its function usually consists in pressing a recording medium 3, for example a single sheet, onto the fixing roller 1.
  • the recording medium 3 runs in the direction indicated by an arrow symbol into a fixing nip between the fixing roller 1 and the pressure roller 2, designated here with section Z1.
  • the stressed side of the recording medium 3 faces the fixing roller 1.
  • the curvature remaining in the recording medium 3 in addition to the diameters D1 and D2 of the fixing roller 1 and the pressure roller 2, is strongly dependent on the geometry of paper guide elements 4, 5 immediately after the fixing gap Z1.
  • FIG. 3 shows this situation for three different outlet directions A, B, C of the recording medium 3 from the fixing gap Z1.
  • outlet direction A the recording medium 3 is deflected upwards (outlet direction A) or downwards (outlet direction B) with the aid of downstream paper guide elements, there is a more or less pronounced curvature of the recording medium 3 in the manner shown.
  • the outlet direction B requires a relatively long straight cooling section immediately after the fixing station, which means that additional space is required.
  • the position of the pressure roller 2 is a horizontal distance X in from the position of the fixing roller 1
  • Direction of recording medium feed offset Viewed in the direction of rotation of the recording medium 3 after the rollers 1, 2, paper guiding elements 4, 5 are provided, which form a paper guide channel 7 for the recording medium 3, which is bent essentially in a U-shape.
  • This paper guide channel 7, which can be divided into two sections Z2 and Z3, depending on the position of a switch (switch PW1 in Fig.
  • the recording medium 3 is bent through the convexly curved and excessively large wall Y of the paper guide element 4 immediately after leaving the fixing gap Z1 in the section Z2 opposite the curvature in the subsequent section Z3 . Since both the temperature gradient for the cooling of the recording medium 3 in the section Z2 is very steep, and since the evaporation of paper moisture takes place immediately after leaving the fixing gap Z1, the curvature in this section Z2 is assumed to a great extent by the recording medium 3. Due to the curvature of the paper guide channel 7 in the section Z3, which, as already mentioned, can be made space-saving and narrow, the recording medium 3 is now bent back to a certain extent. With the correct coordination of the distance X and the dimension Y, and taking into account the speed of the recording medium 3, when leaving section Z3, there is a straight, non-curved recording medium 3, which can be guided, transported and stored without problems in the further course.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Fixing For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Abstract

Dans une imprimante page par page de feuilles individuelles, pour l'impression, des deux côtés, de supports d'enregistrement (13), il est prévu un dispositif de lissage destiné à lisser les bombements du support d'enregistrement (3), dus aux influences de la pression et de la température dans la zone de fixage (F). Par déformation dans la zone plastique, une forme lisse et plane est de nouveau conférée aux supports d'enregistrement (3). A cet effet, le support d'enregistrement (3) est tiré, à l'encontre d'une force de pression exercée par des éléments élastiques, au moyen de rouleaux d'amenée du papier, au-dessus d'un bord et, de cette façon, tendu et dressé. Si le dispositif de lissage est monté juste après la zone de fixage (F), il est proposé de décaler la position du rouleau de pression (2) par rapport à la position du cylindre de fixage (1), en direction de l'amenée du support d'enregistrement. Conjointement avec la conformation géométrique d'un canal de guidage du papier (7) raccordé directement à la fente de fixage (Z1) du dispositif de fixage (F), le support d'enregistrement (3) se trouve incurvé, d'abord dans un sens déterminé, puis dans le sens opposé, de telle sorte que le support d'enregistrement est lisse et uniforme lorsqu'il quitte ledit canal de guidage (7). Le dispositif de lissage permet de redresser des supports d'enregistrement (3) de qualités de papier les plus diverses et de différents grammages spécifiques.

Claims (3)

  1. Dispositif d'impression et de copiage non mécanique fonctionnant selon le principe électrostatique, comportant
    - un support intermédiaire (12), sur lequel des images latentes de caractères à imprimer sont produites en fonction d'une information d'impression et sont développées à l'aide d'un mélange révélateur pour former des images de toner;
    - un poste de transfert (15), dans lequel ces images de toner sont transférées sur un support d'enregistrement (3);
    - un dispositif de fixage (F) pour fixer les images de toner sur le support d'enregistrement (3), et qui est constitué par un cylindre de fixage (1) entraîné par un moteur et un cylindre de pression (2), qui délimitent une fente de fixage (Z1) pour le support d'enregistrement (3) et dans lequel le cylindre de fixage (1) et/ou le cylindre de pression (2) sont chauffés;
    - un dispositif de lissage (G1), pour le support d'enregistrement (3), disposé en aval de la fente de fixage (Z1) lorsqu'on regarde dans la direction de transport du support d'enregistrement (3), et qui élimine des ondulations du support d'enregistrement (3), qui sont provoqués par le dispositif de fixage (F),
    caractérisé par les particularités suivantes:
    - la position du cylindre de pression (2) est décalée, d'une distance horizontale (S), par rapport à la position du cylindre de fixage (1) dans la direction d'amenée du support d'enregistrement,
    - en aval de la fente de fixage (Z1), il est prévu des éléments (4,5) de guidage du papier, qui forment un canal (7) de guidage du papier, constitué de plusieurs sections (Z2, Z3), et
    - dans lequel le contour du canal de guidage (7) du papier est agencé de telle sorte que le support d'enregistrement (3) est recourbé, directement après avoir quitté la fente de fixage (Z1), dans deux sections successives (Z2,Z3) du canal (7) de guidage du papier, d'abord dans un sens, puis dans le sens opposé, de sorte que lorsque le support d'enregistrement (3) a quitté la dernière section (Z3), il est présent sous une forme plane et redressée pour son transport ultérieur.
  2. Dispositif d'impression et de copiage non mécanique suivant la revendication 1, caractérisé par le fait que la première section (Z2), du canal (7) de guidage du papier disposée directement en aval de la fente de fixage (Z1), se rétrécit en direction de la seconde section suivante (Z3), de sorte que le support d'enregistrement (3) est recourbé, dans la première section (Z2), dans le sens de rotation du cylindre de fixage (A).
  3. Dispositif d'impression et de copiage non mécanique suivant la revendication 1 ou 2, caractérisé par le fait que la seconde section (Z3) du canal (7) de guidage du papier s'élargit à partir de la première section précédente (Z2) et que la suite de son allure est telle que les supports d'enregistrement (3) sont déviés en sens opposé du sens d'amenée des supports d'enregistrement.
EP88905355A 1988-03-14 1988-06-22 Dispositif de lissage de feuilles individuelles dans des machines d'impression et de reproduction non mecaniques Expired - Lifetime EP0404769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808477A DE3808477A1 (de) 1988-03-14 1988-03-14 Vorrichtung zum glaetten von einzelblaettern in nichtmechanischen druck- und kopiereinrichtungen
DE3808477 1988-03-14

Publications (2)

Publication Number Publication Date
EP0404769A1 EP0404769A1 (fr) 1991-01-02
EP0404769B1 true EP0404769B1 (fr) 1992-11-04

Family

ID=6349700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88905355A Expired - Lifetime EP0404769B1 (fr) 1988-03-14 1988-06-22 Dispositif de lissage de feuilles individuelles dans des machines d'impression et de reproduction non mecaniques

Country Status (5)

Country Link
US (1) US5191379A (fr)
EP (1) EP0404769B1 (fr)
JP (1) JPH03505487A (fr)
DE (2) DE3808477A1 (fr)
WO (1) WO1989008872A1 (fr)

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US5316539A (en) * 1992-09-01 1994-05-31 Lexmark International, Inc. Self-adjusting paper recurler
US6024497A (en) * 1998-06-29 2000-02-15 Xerox Corporation Bushing with molded spring
US6112048A (en) * 1999-09-10 2000-08-29 Lexmark International, Inc. Apparatus for curling materials
US6064853A (en) * 1999-09-10 2000-05-16 Lexmark International, Inc. Apparatus for curling materials
US6908242B2 (en) * 2001-12-04 2005-06-21 Seiko Epson Corporation Roll paper curl correction device and record apparatus with the roll paper curl correction device
US6661989B2 (en) * 2002-04-09 2003-12-09 Xerox Corporation Xerographic fusing apparatus with input sheet guide
DE102004012697A1 (de) 2003-04-11 2004-10-21 Heidelberger Druckmaschinen Ag Bogenglätteinrichtung
JP2005255296A (ja) * 2004-03-10 2005-09-22 Konica Minolta Business Technologies Inc 画像形成装置
US8388245B2 (en) * 2005-05-18 2013-03-05 Revoprint Ltd. Incorporated printer with separate-sheet printing and book printing capabilities
US8231286B2 (en) * 2005-05-18 2012-07-31 Revoprint Ltd. System for printing a book on pre-bound pages
US7547152B2 (en) * 2005-05-18 2009-06-16 Revoprint Ltd. System for book printing and assembly using a pre-bound page block
US7690641B2 (en) * 2007-06-04 2010-04-06 Xerox Corporation Gateless diverter—'S' shaped paper path

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Publication number Priority date Publication date Assignee Title
US3861863A (en) * 1973-12-19 1975-01-21 Ibm Fusing apparatus
US4505695A (en) * 1983-04-18 1985-03-19 Xerox Corporation Sheet decurling mechanism
GB8315732D0 (en) * 1983-06-08 1983-07-13 Xerox Corp Sheet curl control apparatus
US4652110A (en) * 1984-02-29 1987-03-24 Canon Kabushiki Kaisha Image recording apparatus
US4632533A (en) * 1985-04-01 1986-12-30 Xerox Corporation Off-set nip roll decurler
US4591259A (en) * 1985-04-01 1986-05-27 Xerox Corporation Tri-pass baffle decurler
JPS62283374A (ja) * 1986-06-02 1987-12-09 Hisayoshi Totsuka 定着装置
US4926358A (en) * 1987-05-20 1990-05-15 Ricoh Company, Ltd. System for controlling curls of a paper
US5017970A (en) * 1987-06-30 1991-05-21 Minolta Camera Kabushiki Kaisha Fixing device with movable nip region for use in copiers
US4864124A (en) * 1987-12-23 1989-09-05 Xerox Corporation Sealed mechanical actuator and electro-optic sensor for use in sheet feeding
US4977432A (en) * 1988-07-13 1990-12-11 Gradco Systems, Inc. Decurling and offsetting device

Also Published As

Publication number Publication date
DE3808477A1 (de) 1989-09-28
US5191379A (en) 1993-03-02
WO1989008872A1 (fr) 1989-09-21
EP0404769A1 (fr) 1991-01-02
DE3875741D1 (de) 1992-12-10
JPH03505487A (ja) 1991-11-28

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