EP0486723A1 - Unité de chauffage pour chauffer un support d'enregistrement dans une imprimante ou un copieur - Google Patents

Unité de chauffage pour chauffer un support d'enregistrement dans une imprimante ou un copieur Download PDF

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Publication number
EP0486723A1
EP0486723A1 EP19900122332 EP90122332A EP0486723A1 EP 0486723 A1 EP0486723 A1 EP 0486723A1 EP 19900122332 EP19900122332 EP 19900122332 EP 90122332 A EP90122332 A EP 90122332A EP 0486723 A1 EP0486723 A1 EP 0486723A1
Authority
EP
European Patent Office
Prior art keywords
heating
endless belts
recording medium
station
endless
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
EP19900122332
Other languages
German (de)
English (en)
Other versions
EP0486723B1 (fr
Inventor
Helmut Dipl.-Ing. Naeser (Fh)
Klaus Dipl.-Ing. Kümmel
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 Nixdorf Informationssysteme 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 Nixdorf Informationssysteme AG filed Critical Siemens Nixdorf Informationssysteme AG
Priority to DE59006076T priority Critical patent/DE59006076D1/de
Priority to EP90122332A priority patent/EP0486723B1/fr
Publication of EP0486723A1 publication Critical patent/EP0486723A1/fr
Application granted granted Critical
Publication of EP0486723B1 publication Critical patent/EP0486723B1/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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • 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
    • 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
    • G03G15/2064—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat combined with pressure
    • 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
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/1695—Simultaneous toner image transfer and fixing at the second or higher order transfer point
    • 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
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/207—Type of toner image to be fixed 
    • G03G2215/2083—Type of toner image to be fixed  duplex

Definitions

  • the invention relates to a device for heating a record carrier in a printing or copying machine according to the features of claim 1.
  • Printing or copying devices operating on the principle of electrophotography are generally known.
  • a charge image is generated on a recording medium in the form of a photoconductor, developed with toner in a developer station and the toner image is transferred to a recording medium in the form of a paper tape or in the form of single sheets in a transfer printing station.
  • the toner images are fixed by pressure and heat in a fixing station arranged downstream of the transfer printing station.
  • the fixation stations used here, as z. B. are described in US-A1-4 147 922, contain a preheating device in the form of a heating saddle and the actual fixing device consisting of two fixing rollers, at least one of which is heated. The toner particles are melted into the paper by heat and pressure.
  • EP-B1-0 212 685 a contact fixing device for an electrophotographic copier in which a toner image is recorded by a photoconductor drum with the aid of a transfer belt, heated in a heating station and then transferred to paper under the action of pressure.
  • the transfer ribbon is made of silicone and a flat heating element is used as a heating station, over which the transfer ribbon slides.
  • heating the transfer ribbon alone from the rear requires a large amount of energy and targeted measures to prevent the transfer ribbon from overheating.
  • Contactless heating with the aid of a heater from the toner image side would prevent blurring of the toner images, however, when using heater heaters, a high level of regulation and monitoring is necessary in order to prevent partial overheating of the transfer ribbons due to the high temperatures of the heater.
  • the aim of the invention is to provide a device for heating a recording medium in a printing or copying machine, which enables a targeted heating of the recording medium without blurring the toner image with the greatest possible efficiency.
  • the device should also be suitable for heating recording media which carry a toner image on both the front and the back.
  • Another object of the invention is to design the device so that it can be used as a thermal fuser.
  • the device is for heating any type of recording medium with toner images arranged thereon suitable.
  • These can e.g. B. transfer ribbons, photoconductor ribbons, continuous paper or single sheets.
  • the recording media can carry toner images both on the front and on the back.
  • the heating station can be used within a heat setting station or can itself be designed as a heat setting station. It is particularly suitable for fixing toner images on sheet-like recording media in duplex mode.
  • toner and recording medium enables a lower fixing pressure. This results in a gentler paper treatment with less tendency to paper curl.
  • the conically tapered inlet area to the fusing station enables the individual sheets to be smoothly phaseed in and the individual sheets to be transported at the same process speed as in the transfer printing area. Additional control means between the transfer printing station and the fixing station are therefore not necessary.
  • the fusing station can connect directly to the transfer station without a gap. This significantly reduces the overall structure of the device and reduces the risk of blurring the toner images.
  • the positive guidance of the record carrier within the fusing station reduces paper run disturbances.
  • At least one endless belt is designed to be pivotable. So that's a easy access to the transport channel possible when servicing.
  • a paper heating saddle over which the endless belt is guided is arranged for heating the endless belts.
  • the paper heating saddle contains infrared heating elements in the form of so-called heating cartridges. This makes it particularly easy to regulate the heat supply to the endless belts and thus to the recording medium.
  • the large-area heat transfer enables the use of several heating elements with lower output and lower operating temperature. This significantly reduces the heat losses in the device and achieves high efficiency.
  • the contact between the recording medium and the heating saddle ensures optical heat transfer. This ensures constant heating of the recording medium immediately after starting the device. Waiting times before starting up the device are thus significantly reduced.
  • the relatively strong deflection of the endless belts in the exit area of the heating station prevents stripping errors when operating with single sheets by deflecting the single sheets from the channel or transport direction when exiting the heating station.
  • the entire heating station whether it is designed as a preheating device or as a fixing station, is simple in construction, easy to manufacture and requires little maintenance.
  • the heating of the recording medium on both sides prevents the recording medium from being deformed or distorted. This is especially important when processing single sheets.
  • the heating station also enables a short design of the printing or copying machine.
  • a thermal printing fixing station shown in FIG. 1 for a printing or copying machine which is operated in duplex mode essentially consists of a heating station W and a fixing area FX.
  • the fixing area FX contains a pair of fixing rollers with a fixed fixing roller 28 and a z. B. under the force of a spring 29 pressing against the fixing roller 28 pressure roller 30.
  • Both pressure roller 30 and fixing roller 28 consist of an aluminum hollow roller with radiator heater 31 arranged therein in the form of a halogen heater.
  • the fixing rollers 28, 30 are arranged with respect to their linear contact zone, the actual printing area of the fixing rollers, at the end of a feed channel 32 for a recording medium 33.
  • the record carriers 33 consist of individual sheets which are fed next to one another to the heating station W and which are printed with toner images on the front and back with an upstream transfer station, not shown here.
  • the fixing rollers 28 and 30 are also assigned an oiling device 34, which is usually constructed, for supplying separating oil.
  • the heat station W is located immediately upstream of the fixing rollers FX in the direction of movement of the recording media. It contains a first electromotively driven endless belt 35/1 assigned to a front side of the recording medium 33 and a second electromotive driven endless belt 35/2 assigned to a rear side of the recording medium 33.
  • the endless belts are arranged opposite one another in such a way that a heating channel 36 is formed for the recording medium, which extends in an input area 37 to an exit area 38. It is part of the feed channel 32.
  • the endless belts 35 are elastic, heat-resistant belts made of toner-repellent material, eg. B. PTFE silicone tapes.
  • the guide rollers e.g. B. be formed on the output side 40 as tension rollers.
  • the endless belts 35 are guided in such a way that a wedge-shaped entrance area results, which enables the individual sheets 33 to be smoothly phased into the heating station W.
  • the heating saddle 41 contains a plurality of heating cartridges serving as heating elements in the form of infrared heating elements which are individually exchangeably mounted in the heating saddle 41.
  • the heat saddle 41 consists of a slightly spherical aluminum block.
  • a spacer 43 in the form of a metal element extending across the width of the heating channel 32 is located between the input area 37 and the exit area 38.
  • the spacer 43 is resiliently mounted via springs 44 and presses flatly on the inside of the endless belts in the region of the feed channel or the heating channel 36.
  • a spacer 43 of this type is assigned to each of the endless belts.
  • the spacers 43 ensure an exact guidance of the recording media 33 in the heating channel 36.
  • a cleaning station 45 is therefore assigned to each endless belt. B. clean the endless belts with the help of a brush or a fleece.
  • the heating station W has an insulating housing 46 (FIG. 2). It extends on both sides of the heating station W over the entire width of the endless belts 35.
  • the heat insulation prevents the surroundings from heating up and enables short heating times when the heating station is switched on. Furthermore, such a housing reduces heat loss during standby operation.
  • the thermal fuser shown in Figure 1 works as follows:
  • the single sheets 33 provided with toner images in a transfer printing area (not shown here) of the electrophotographic printing or copying device are fed via the feed channel 32 to the input area 37 of the heating station.
  • the two endless belts 35/1 and 35/2 gently grasp the leading edges of the single sheets 33, regardless of the thickness of the single sheets. This is particularly the case if 35 elastic belts are used as endless belts.
  • the endless belts are operated in opposite directions, absolutely synchronously, which can be achieved by a drive coupling.
  • the single sheets 33 are fed to the heating channel 36 and heated there.
  • the temperature in the heating channel 36 is controlled via the heating saddle 41 so that there is a slow, constant heating of toner and paper in the heating channel 36 is coming.
  • the toner is brought to the fixing temperature. After leaving the heating station via the exit area 38, the toner on the individual sheets 33 already has a pasty consistency.
  • the individual sheets 33 are now gripped by the fixing rollers 28 and 30 and thus passed through the actual fixing area FX. Since the toner is already doughy when entering the actual fixing area between the fixing rollers 28 and 30, it is possible to keep the fixing pressure, ie the pressure of the pressure roller 30 against the fixing roller 28, low.
  • the drive of the fixing rollers is synchronized with the drive of the endless belts in the heating station. The required low pressure in the fusing area between the fusing rollers results in gentle paper handling and the risk of paper curl is minimal.
  • the fixing rollers 28 and 30 can be dispensed with. It is thus possible, in accordance with the illustration in FIG. 2, to design the heating station W itself as a fixing station.
  • the function of such a heat station corresponds to the heat-setting station of FIG. 1, with the toner being heat-fixed on the individual sheets 33 within the heating channel 36.
  • the function of the fixing rollers is taken over by the spring-loaded spacers 43.
  • the upper endless belt 35/1 is designed to be pivotable from the lower endless belt 35/2 with the aid of a pivoting device. So z. B. possible to easily fix paper flow problems in the heating channel or in the feed channel 32.
  • the guide rollers for the endless belts are supported on one side in upper and lower bearing elements 48/1, 48/2.
  • the bearing elements 48 are coupled to one another via a hinge 49 with an axis of rotation 50.
  • the drives of the endless belts and thus the bearing elements 48/1 and 48/2 via a coupling area 51, for. B. in the form of a gear, engaged and disengaged from each other.
  • the bearing elements 48 are connected to an electric motor 52 for driving the endless belts.
  • a handle 47 is assigned in the upper endless belt 35/1 to facilitate pivoting in and out.
  • the described heating station is to be used in a printing or copying machine in simplex operation, it is possible to do without heating an endless belt. It is also conceivable for the heating of the heating saddles to be alternately switchable depending on the operating mode.
  • the heat station W described with reference to FIGS. 1 and 2 can also be used according to an exemplary embodiment corresponding to FIG. 4 as a heat station for preheating a transfer belt in a contact fixing device, as is described in more detail in EP-B1-0 212 685.
  • a toner image developed on a photoconductor 54 is transferred to a transfer belt 55.
  • the toner image located on the transfer belt 55 is then brought to a fixing temperature in the heating station W and then transferred to the recording medium 33 between two transfer rollers 56. After the transfer, the transfer belt 55 is cleaned of adhering toner between cleaning rollers 57.
  • the heating station it is also advantageously possible to use a recording medium without a toner image, e.g. B. to heat a paper web or a single sheet and then to print the heated recording medium in a subsequent transfer station with a toner image.
  • This transfer printing station can then be designed analogously to the exemplary embodiment in FIG. 4.
  • the transfer printing station it would then also be possible with the aid of pressure rollers to fix the toner image on the recording medium.
  • the heating of the transfer belt or the transferring photoconductor belt could thus be omitted.
  • the heating device is designed for processing recording media of different widths or formats.
  • Such adaptation is z. B. possible by the arrangement of switchable side by side arranged heating elements (heating cartridges), this connection can be coupled with the device control and is done automatically.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
EP90122332A 1990-11-22 1990-11-22 Unité de chauffage pour chauffer un support d'enregistrement dans une imprimante ou un copieur Expired - Lifetime EP0486723B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59006076T DE59006076D1 (de) 1990-11-22 1990-11-22 Wärmestation zum Erwärmen eines Aufzeichnungsträgers in einem Druck- oder Kopiergerät.
EP90122332A EP0486723B1 (fr) 1990-11-22 1990-11-22 Unité de chauffage pour chauffer un support d'enregistrement dans une imprimante ou un copieur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90122332A EP0486723B1 (fr) 1990-11-22 1990-11-22 Unité de chauffage pour chauffer un support d'enregistrement dans une imprimante ou un copieur

Publications (2)

Publication Number Publication Date
EP0486723A1 true EP0486723A1 (fr) 1992-05-27
EP0486723B1 EP0486723B1 (fr) 1994-06-08

Family

ID=8204742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122332A Expired - Lifetime EP0486723B1 (fr) 1990-11-22 1990-11-22 Unité de chauffage pour chauffer un support d'enregistrement dans une imprimante ou un copieur

Country Status (2)

Country Link
EP (1) EP0486723B1 (fr)
DE (1) DE59006076D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864943A1 (fr) * 1997-03-14 1998-09-16 Agfa-Gevaert N.V. Fixage par fusion en une seule passe de copies double face à couches multiples
EP0867786A1 (fr) * 1997-03-14 1998-09-30 Agfa-Gevaert N.V. Fixage par fusion en une seule passe de copies double face à couches multiples
US5983063A (en) * 1997-03-14 1999-11-09 Agfa-Gevaert N.V. Single-pass fusing of multi-layer duplex copies

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666247A (en) * 1969-12-29 1972-05-30 Ibm Fusing device and method
US3810735A (en) * 1972-12-26 1974-05-14 Xerox Corp Heat fixing apparatus for fusible material
US3811828A (en) * 1970-10-29 1974-05-21 Ricoh Kk Process and device for heating and fixing an image upon a recording medium
US4147922A (en) * 1977-02-15 1979-04-03 Siemens Aktiengesellschaft Device for fixing a toner image
US4242566A (en) * 1980-03-21 1980-12-30 Pitney Bowes Inc. Heat-pressure fusing device
EP0256770A1 (fr) * 1986-08-06 1988-02-24 Xerox Corporation Rouleaux de fusion
EP0295901A2 (fr) * 1987-06-16 1988-12-21 Canon Kabushiki Kaisha Appareil de fixage d'images

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551288B1 (fr) * 1990-10-02 1994-07-20 Siemens Nixdorf Informationssysteme Aktiengesellschaft Poste de thermofixage avec transport par bande

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666247A (en) * 1969-12-29 1972-05-30 Ibm Fusing device and method
US3811828A (en) * 1970-10-29 1974-05-21 Ricoh Kk Process and device for heating and fixing an image upon a recording medium
US3810735A (en) * 1972-12-26 1974-05-14 Xerox Corp Heat fixing apparatus for fusible material
US4147922A (en) * 1977-02-15 1979-04-03 Siemens Aktiengesellschaft Device for fixing a toner image
US4242566A (en) * 1980-03-21 1980-12-30 Pitney Bowes Inc. Heat-pressure fusing device
EP0256770A1 (fr) * 1986-08-06 1988-02-24 Xerox Corporation Rouleaux de fusion
EP0295901A2 (fr) * 1987-06-16 1988-12-21 Canon Kabushiki Kaisha Appareil de fixage d'images

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 40 (E-102), 6. April 1979; & JP-A-54 18 747 (RICOH K.K.) 13-02-1979 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864943A1 (fr) * 1997-03-14 1998-09-16 Agfa-Gevaert N.V. Fixage par fusion en une seule passe de copies double face à couches multiples
EP0867786A1 (fr) * 1997-03-14 1998-09-30 Agfa-Gevaert N.V. Fixage par fusion en une seule passe de copies double face à couches multiples
US5983063A (en) * 1997-03-14 1999-11-09 Agfa-Gevaert N.V. Single-pass fusing of multi-layer duplex copies
US6002894A (en) * 1997-03-14 1999-12-14 Agfa-Gevaert Single-pass fusing of sheet-fed multi-layer duplex copies

Also Published As

Publication number Publication date
DE59006076D1 (de) 1994-07-14
EP0486723B1 (fr) 1994-06-08

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