EP0486723B1 - 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
EP0486723B1
EP0486723B1 EP90122332A EP90122332A EP0486723B1 EP 0486723 B1 EP0486723 B1 EP 0486723B1 EP 90122332 A EP90122332 A EP 90122332A EP 90122332 A EP90122332 A EP 90122332A EP 0486723 B1 EP0486723 B1 EP 0486723B1
Authority
EP
European Patent Office
Prior art keywords
heating
recording medium
station
channel
fixing
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
EP90122332A
Other languages
German (de)
English (en)
Other versions
EP0486723A1 (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 device 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 in a fixing station downstream of the transfer printing station by pressure and heat.
  • the fusing stations used, such as z. B. are described in US-A-4 147 922, contain a preheater 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-B-0 212 685 discloses a contact fixing device for an electrophotographic copier, in which a toner image is taken up 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 the heating station, over which the transfer ribbon slides.
  • heating the transfer ribbon alone from the rear requires a high 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 the toner images from being smeared, but when using heater heaters, a high level of regulation and monitoring is necessary in order to prevent partial overheating of the transfer belts due to the high temperatures of the heater.
  • a thermal printing fixing device for fixing single sheets printed on one side which has two heated fixing tapes and a fixing zone with a plurality of pressure rollers arranged side by side.
  • the pressure rollers exert a linear pressure on the recording medium in the fixing zone.
  • a fusing station with two endless belts which also serves for fusing single sheets carrying a toner image on both sides.
  • the endless belts are arranged offset from one another and form a fixing zone in their contact area, the fixing zone being heated via heating elements arranged on both sides of the contact zone.
  • the single sheets are fed between the endless belts and heated up very quickly there. There is therefore a risk that the toner image will be blurred and stressed by the rapid heating of the recording media.
  • EP-A-0 256 770 describes a heating roller for a fixing device with heating elements arranged thereon, which can be adapted to the size of the copy sheets to be fixed with regard to its active heating zone.
  • the aim of the invention is to provide a device for heating a record carrier in a printing or copying machine, which enables targeted heating of the record carrier without blurring the toner image with the greatest possible efficiency while protecting the record carrier material as much as possible.
  • 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 any clearance. 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 flow 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 is arranged in a special embodiment of the invention, over which the endless belt is guided.
  • the paper heating saddle contains infrared heating elements in the form of so-called heating cartridges. This makes it particularly easy to regulate the supply of heat to the endless belts and thus to the recording medium.
  • the large 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 heat saddle ensures optical heat transfer. This ensures constant heating of the recording medium immediately after starting the device. Waiting times before putting the device into operation are 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 heat 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 directly 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, for. B. PTFE silicone tapes.
  • the guide rollers e.g. B. on the output side 40 can be designed as tensioning 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 heating 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 area 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 record carriers 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 fusing station shown in FIG. 1 functions 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 heating 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 that 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 are connected 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 heating 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 heating 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 the 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 ribbon or the transferring photoconductor ribbon 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 to the device control and is done automatically.
  • this adjustment it is also conceivable, for. B. to achieve this adjustment by sliding panels or by immersing the heating elements in the heating caliper or z. B. to arrange several endless belts next to each other with assigned heating.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)

Claims (8)

  1. Dispositif pour chauffer un support d'enregistrement (33) dans un appareil d'impression ou de copiage, comportant
    - une première bande sans fin (35/1), qui est associée à une face avant du support d'enregistrement (33) et est entraînée par un moteur électrique,
    - une seconde bande sans fin (35/2), qui est associée à une face arrière du support d'enregistrement (33) et est entrainée par un moteur électrique, les bandes sans fin (35/1, 35/2) étant disposées en vis-à-vis l'une de l'autre de manière à délimiter un canal de guidage et de chauffage pour le support d'enregistrement (33), qui s'étend depuis une zone d'entrée (37) jusqu'à une zone de sortie, le canal de guidage (36, 32) étant rétréci dans la zone d'entrée (37) dans la direction de déplacement du support d'enregistrement (33), conformément à un angle d'arrivée prédéterminé et permettant ainsi une insertion en douceur du support d'enregistrement (33) portant des images de toner,
    - des entretoises (43), qui sont prévues pour les bandes sans fin (35/1, 35/2) et sont disposées des deux côtés du canal de guidage et de chauffage (36, 32), s'étendent à plat au-dessus des bandes sans fin (35/1, 35/2) et appliquent à ces dernières une force de serrage uniforme, et
    - un dispositif de chauffage (41) qui chauffe uniformément les bandes sans fin (35/1, 35/2) à l'extérieur du canal de guidage et de chauffage (36, 32).
  2. Dispositif suivant la revendication 1, comportant des moyens à ressorts (44) servant à serrer réciproquement, de façon élastique, les entretoises (43) dans la zone du canal de chauffage et de guidage (36).
  3. Dispositif suivant l'une des revendications 1 ou 2, dans lequel le dispositif de chauffage comporte une selle chauffante (41) dans laquelle sont disposés des éléments chauffants (42), et sur laquelle circule la bande sans fin (35/1, 35/2).
  4. Dispositif suivant la revendication 3, dans lequel les éléments chauffants (42) sont constitués par des éléments chauffants à infrarouge, qui sont disposés dans la selle chauffante (41), de manière à être remplaçables.
  5. Dispositif suivant l'une des revendications 1 à 4, dans lequel il est prévu des moyens (49, 53) qui permettent d'écarter par pivotement les bandes sans fin (35/1, 35/2) l'une de l'autre.
  6. Dispositif suivant l'une des revendications 1 à 5, dans lequel il est prévu un boîtier (46) réalisant une isolation thermique et qui s'étend au-dessus des bandes sans fin (35/1, 35/2).
  7. Dispositif suivant l'une des revendications 1 à 6, dans lequel le dispositif de chauffage est agencé de manière à être adaptable à la largeur du support d'enregistrement (33).
  8. Dispositif suivant la revendication 7, dans lequel le dispositif de chauffage possède des éléments chauffants pouvant être le cas échéant raccordés en supplément, en fonction de la largeur du support d'enregistrement (33).
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 EP0486723A1 (fr) 1992-05-27
EP0486723B1 true 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

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPH10254282A (ja) * 1997-03-14 1998-09-25 Agfa Gevaert Nv シート供給型多層両面複写の１回パスによる融着
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992006417A1 (fr) * 1990-10-02 1992-04-16 Siemens Nixdorf Informationssysteme Aktiengesellschaft Poste de thermofixage avec transport par bande

Family Cites Families (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
DE2706362C3 (de) * 1977-02-15 1979-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Wärmeschmelzfixiereinrichtung
US4242566A (en) * 1980-03-21 1980-12-30 Pitney Bowes Inc. Heat-pressure fusing device
US4883941A (en) * 1986-08-06 1989-11-28 Xerox Corporation Filament wound foil fusing system
EP0295901B1 (fr) * 1987-06-16 1995-12-20 Canon Kabushiki Kaisha Appareil de fixage d'images

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992006417A1 (fr) * 1990-10-02 1992-04-16 Siemens Nixdorf Informationssysteme Aktiengesellschaft Poste de thermofixage avec transport par bande

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Publication number Publication date
DE59006076D1 (de) 1994-07-14
EP0486723A1 (fr) 1992-05-27

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