EP0404769A1 - 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.

Info

Publication number
EP0404769A1
EP0404769A1 EP88905355A EP88905355A EP0404769A1 EP 0404769 A1 EP0404769 A1 EP 0404769A1 EP 88905355 A EP88905355 A EP 88905355A EP 88905355 A EP88905355 A EP 88905355A EP 0404769 A1 EP0404769 A1 EP 0404769A1
Authority
EP
European Patent Office
Prior art keywords
recording medium
paper
fixing
paper guide
guide channel
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.)
Granted
Application number
EP88905355A
Other languages
German (de)
English (en)
Other versions
EP0404769B1 (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
Siemens 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 Siemens AG filed Critical Siemens AG
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

Links

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. This can be done, for example, by generating charge images 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 toner particles that form the color and ferromagnetic carrier particles.
  • the images are then transferred to an image receiving material as the final record carrier in a transfer station. 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 recording medium 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 fixing gap 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.
  • this results in increased stripping problems on the electrophotographic intermediate image carrier and deviations in assignment between print information and recording medium.
  • 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 feedback device.
  • the control of the printer then assigns the corresponding printed image to the corresponding front and back pages of the single sheets.
  • the correct sequence for the output or filing is ensured in that all sheets to be printed are guided over the print channel and the return channel, including the turning device.
  • Print job in its majority of single sheets that are printed on only one side and otherwise only a small number of single sheets to be printed on both sides, so the entire print job must still be carried out in duplex mode.
  • Page printers with single sheet operation are relatively complicated in terms of paper transport, and the required tolerances in the paper channel are low. Since such page printers with printing speeds of
  • 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. This object is achieved in a device of the type mentioned at the outset according to the features of the first claim.
  • 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 freed from bulges and curvatures in a simple manner, 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 immediately after leaving the fixing gap in the direction of rotation of the fixing roller 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 record carrier between two pairs of paper transport rollers is pulled smoothly over an edge under the action of force.
  • the record carrier is pressed against a base at a Ran ⁇ zone by means of spring elements, while the other end of the record carrier is conveyed by a pair of paper transport rollers.
  • a particularly simple smoothing device is obtained if the spring element is implemented as a simple metal bracket, which is pre-stressed and lies on the recording medium and is rounded off in a semicircle in the support area.
  • a larger area of the recording medium can also be smoothed if the distance of the two pairs of paper transport rollers is shortened relative to one another, so that the remaining paper zone remaining between the edge and the paper end is subjected to the smoothing effect.
  • the pressing force which presses the recording medium against the edge can be generated by two sheet metal elements which are articulated to one another and are mounted against one another by means of a spring element and can be pivoted about an axis fixed to the frame against the edge and whose free lever arm acts on an actuator taking two end positions a solenoid is articulated.
  • FIG. 1 shows a schematic sectional illustration of the non-mechanical printing device for processing single sheets
  • FIG. 2 shows a schematic illustration of a fixing device with a downstream paper guide channel for smoothing single sheets
  • FIG. 3 shows in principle the curvature remaining in the recording medium as a function of the outlet direction from the fixing zone
  • FIG. 4 is a schematic representation of a device for smoothing single sheets of different thickness and specific weight and FIG. 5 shows a further embodiment of the smoothing device according to FIG. 3.
  • the paper storage containers V1, V2 and V3 are constructed in the usual manner and have a motorized mechanism which can be moved in the direction of the arrow in accordance with the paper supply
  • Paper storage containers V1, V2, V3 are connected via paper feed channels 11 to a pressure channel DK of the printing device.
  • the printing 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 1A, a transfer printing station 15 and a cleaning station 16.
  • the printing channel DK contains paper transport elements in the form 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 used in the so-called duplex operation before being fed again to the pressure channel DK.
  • a paper switch PW1 Controlled by a paper switch PW1, 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, and 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.
  • 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 ABI and AB2. Furthermore, a waste container AF (copy tray) which can be controlled via the switch PW4 is provided.
  • all paper channels have paper scanning sensors LS (shown as black triangles), which consist of light barriers and continuously monitor the paper flow.
  • paper alignment devices PA1 to PA3 are further 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 Fixlerstatlon F and the photoconductor drum 12 via two motors M1 and M2.
  • the motor M1 drives the
  • electrically controllable clutches for example spring band clutches
  • 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. At least the fixing roller 1 is heated by the rollers 1, 2. 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 gap, designated here with section Z1, between the fixing roller 1 and the pressure roller 2.
  • 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 ZI.
  • 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.
  • paper guiding elements 4, 5 Seen in the running direction of the recording medium 3 after the rollers 1, 2, paper guiding elements 4, 5 are provided, which form an essentially U-shaped paper guiding channel 7 for the recording medium 3.
  • 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 split by the convexly curved and excessively high dimension Y of the paper guide element 4 immediately after leaving the fixi, it splits Z1 in section Z2 against the curvature bent in the following 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 large 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.
  • FIGS. 4 and 5 Two further embodiments of smoothing devices for single sheets are shown in FIGS. 4 and 5, these arrangements preferably being arranged between the paper alignment device PA2 shown in FIG. 1 and the turning device W1.
  • 17, 18 and 19, 20 each denote a pair of paper transport rollers which are driven synchronously at the same speed by the motor M2, so that they roll in opposite directions in pairs and thereby the recording medium, in this Transport the trap cut sheets 3 in the direction indicated by an arrow symbol.
  • paper guide elements 21 and 22 are provided before and after the first pair of paper transport rollers 17, 18, as seen in their running direction.
  • the papler guide element 21 can be designed in a manner known per se such that the individual sheets 3 are directed into a roller cellar between the two paper transport rollers 17, 18, which is not shown here.
  • the further paper guide element 21 joins the paper transport rollers 17, 18 in such a way that a horizontal support surface is first created for the recording medium 3, so that the recording medium outlet lies approximately on a level with the contour of the paper guide element 22 in front of the paper transport rollers 17, 18.
  • the paper guide element 21 kinks at right angles in the direction of the second pair of paper transport rollers 19, 20, whereby an edge 24 is created is and then forms a wall of a paper guide channel 25 which leads directly into the inlet area of the paper transport rollers 19, 20.
  • the other boundary of this paper guide channel 25 is formed by a concavely curved paper deflector 26, which extends from the edge 24 of the
  • Paper guide element 21 also extends into the recording medium inlet of the paper transport rollers 19, 20.
  • a spring element 23 which rests under prestress on the horizontal section of the paper guide element 21 in the form of a semicircularly rounded metal sheet which presses the single sheet 3 against the paper guide element 21.
  • the single sheet 3 is conveyed along the paper guide element 23 by the paper transport rollers 17, 18 in the direction shown and is then pushed along the contour of the horizontal section of the paper guide element 21.
  • the front edge of the single sheet 3 passes between the spring element 23 and the paper guide element 21 and is thereby pressed against the paper guide element 21.
  • the front edge of the single sheet 3 leaves the pressure area of the spring element 23 and abuts against the paper deflector 26, whereby the single sheet 3 is deflected in the direction of the second pair of paper feed rollers 19, 20, reaches the inlet area of the paper feed rollers 19, 20 and is finally caught by them becomes.
  • the single sheet 3 is then conveyed evenly until finally the end of the single sheet 3 disengages from the transport rollers 17, 18 and is held by the spring element 23 while the transport rollers 19, 20 tighten the single sheet.
  • the single sheet is stretched against the edge 24 of the paper guide element 21 and finally ent subtracted against the spring force of the spring element 23 around this edge 24. Since the edge 24 has a radius of less than 0.5 mm, the last zone of the single sheet 3 is plastically deformed when the single sheet 3 is pulled off.
  • a larger area of the single sheet 3 can also be aligned and smoothed using the smoothing device G2 according to FIG.
  • the distance between the two pairs of paper transport rollers 17, 18 and 19, 20 must be reduced and, on the other hand, two mutually independent drive devices for the paper transport rollers must be provided. This can be done either with the help of separate drive motors or by means of motor M2 and corresponding couplings.
  • the single sheet 3 is gripped by the pair of rollers 19, 20 and at the same time the drive of the rollers pair 17,18 switched off, the remaining paper zone between the edge 24 and the paper end of the single sheet 3 is subjected to the smoothing effect.
  • FIG. 5 shows a modified form of the smoothing device G2 described with reference to FIG. 4, in which the same elements are provided with the same reference symbols.
  • a paper deflector 27 consisting of two straight legs and bending at an obtuse angle in the direction of the paper transport rollers 17, 18 is provided.
  • the function of the paper guide element 21 with its edge 24, as shown in FIG. 4, required for smoothing the individual sheets 3, is assumed here by two sheet metal profiles 29, 30 which are connected to one another in an articulated manner and are resiliently mounted against one another by means of a spring element 31 and which are connected to the actuator 32 of a lifting magnet 28.
  • the sheet metal profiles 29, 30 are rotatably mounted on an axle 33 fixed to the frame, so that the edge 24 of the sheet profile 30 used for pulling off can be pivoted on and off the paper guide plate 27 by means of the actuator 32 of the lifting magnet 28.
  • the actuator 32 of the lifting magnet 28 is in position H, whereby the sheet profile 30 is pivoted away from the paper guide plate 27.
  • Single sheet 3 is pushed over the edge 24 without the action of the actual smoothing action and then deflected by means of the paper guide plate 27 in the direction of the paper transport rollers 19, 20.
  • the lifting magnet 28 is activated and the actuator 32 moves to position G.
  • the sheet profile 30 is pressed against the paper guide plate 27 in the region of the edge 24. Since this sheet profile 30 is resiliently supported against the sheet profile 29, this becomes Single sheet 3 is more or less positively pressed against the edge 24 according to its rigidity, with which single sheets 3 of the different weight class can be bent and aligned in a targeted and uniform manner.

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.
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
DE3808477 1988-03-14
DE3808477A DE3808477A1 (de) 1988-03-14 1988-03-14 Vorrichtung zum glaetten von einzelblaettern in nichtmechanischen druck- und kopiereinrichtungen

Publications (2)

Publication Number Publication Date
EP0404769A1 true EP0404769A1 (fr) 1991-01-02
EP0404769B1 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
US6064853A (en) * 1999-09-10 2000-05-16 Lexmark International, Inc. Apparatus for curling materials
US6112048A (en) * 1999-09-10 2000-08-29 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
US7547152B2 (en) * 2005-05-18 2009-06-16 Revoprint Ltd. System for book printing and assembly using a pre-bound page block
US8231286B2 (en) * 2005-05-18 2012-07-31 Revoprint Ltd. System for printing a book on pre-bound pages
US7690641B2 (en) * 2007-06-04 2010-04-06 Xerox Corporation Gateless diverter—'S' shaped paper path

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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

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Title
See references of WO8908872A1 *

Also Published As

Publication number Publication date
EP0404769B1 (fr) 1992-11-04
WO1989008872A1 (fr) 1989-09-21
US5191379A (en) 1993-03-02
DE3875741D1 (de) 1992-12-10
DE3808477A1 (de) 1989-09-28
JPH03505487A (ja) 1991-11-28

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