EP0125580A1 - Dispositif de fixation - Google Patents

Dispositif de fixation Download PDF

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Publication number
EP0125580A1
EP0125580A1 EP84105039A EP84105039A EP0125580A1 EP 0125580 A1 EP0125580 A1 EP 0125580A1 EP 84105039 A EP84105039 A EP 84105039A EP 84105039 A EP84105039 A EP 84105039A EP 0125580 A1 EP0125580 A1 EP 0125580A1
Authority
EP
European Patent Office
Prior art keywords
heating
fixing device
heater
heating plate
additional
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.)
Ceased
Application number
EP84105039A
Other languages
German (de)
English (en)
Inventor
Peter Paul Schwierz
Adolf Rebhan
Roland Dr. Moraw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0125580A1 publication Critical patent/EP0125580A1/fr
Ceased 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
    • G03G15/20—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

Definitions

  • the invention relates to a fixing device for fixing a liquid-developed toner image by means of heat in a copier, with a curved heating plate, along which the copy sheet with the liquid-developed toner image is passed through a guide roller within the fixing device, and with a heating device for heating the heating plate.
  • the thermal fixing station is used in electrophotographic copiers, in which a charge image is generated on a photoconductor layer, which is developed with developer liquid through deposited toner pigments to form a toner image.
  • the toner image is transferred to a copy carrier such as paper.
  • the developer-moist copy carrier with the toner image is introduced for fixing in the thermal fixing device in which the toner image is to be fixed on the paper in a wipe-proof manner by the action of heat.
  • DE-OS 25 39 642 discloses a device for fixing a toner image by means of heat in an electrophotographic copier working with liquid developer.
  • a heating device is arranged in this fixing device, along which the liquid-developed copy sheet with the toner image on its upper side is moved.
  • the heating device has a curved heating surface on which the copy sheet rests with its rear side and slides along in order to fix the toner image by means of heat.
  • the heating The area is curved in one section.
  • the peripheral surface of the guide roller is knurled and arranged at a distance from the curved or curved surface area of the heating surface that is greater than the sheet thickness.
  • the liquid toners generally consist of dielectric liquids such as Isopar G, an isoparaffinic hydrocarbon that boils at about 164 ° C., in which charged pigments, preferably of carbon black, are dispersed.
  • the liquid toners contain additives to control the charging of the pigments, binders and possibly easily melting waxes with melting temperatures of around 80 ° C.
  • the copy carrier such as paper or film
  • the copy carrier is also moistened with dispersing liquid. This transferred dispersing liquid is evaporated in the fixing device by the action of heat and, in the case of toners containing wax, the aim is to melt the separated wax particles.
  • the cemented copy carrier is passed in a known manner (DE-OS 25 39 642) over a heating plate which in practice has a temperature of 180 ° C to 210 ° C.
  • the higher temperature range is preferably set for waxy toners. Fixing temperatures will be higher than the specified values not used, since in the event of unpredictable jams of the copy material, paper would yellow or even scale or films would melt.
  • the known heating plate When the copier is switched on, the known heating plate is heated up in a longer lead-up phase and cools down again in copy-free intermediate times.
  • the copies are either not correctly fixed, or it has to be waited for a relatively long time, such as up to a few minutes in the pre-run phase, until the optimal final temperature and fixed copies are reached.
  • the object of the invention is to improve a fixing device of the type described above in a copying machine so that even after prolonged downtime of the copying machine, the copies developed with liquid toner, with a shortened heating-up time to the full operating temperature of the fixing device, smudge-proof and with an improved full-tone density when using wax-containing agents Toner will be ejected.
  • This object is achieved in that a temperature-controlled electrical main heater, which is switched on at the beginning of the copying process, and an additional electrical heater, which provides a constant temperature during the standstill of the copier, are in contact with the heating plate and heat it.
  • the main heater consists of two heating rods embedded in the underside of the heating plate, between which the additional heating is arranged and which bears against the underside of the heating plate.
  • the additional heater is preferably centered on the plumb line through the center of the guide roller.
  • the additional heater is embedded in the heating plate between the heating elements.
  • the invention has the advantage that the solution found is suitable for retrofitting in copiers. Because in the modernization of existing copiers, it would be technically and economically unreasonable effort to make major interventions in the electrical circuit of the fixing device. It is therefore a practical solution that the measures to shorten the heating-up time do not interfere with the existing sequential controls of the copying machines and, as a result, complex circuit changes, in particular the temperature control circuit, are avoided by the separately switched auxiliary heater.
  • FIG. 1 An example of the mechanical structure of a fixing device 1 is shown in FIG. 1.
  • a heating plate 4 made of cast aluminum, for example, contains two heating rods 5, 5 as main heating, which are embedded in the underside of the heating plate 4.
  • the additional heater 2 is arranged between these heating rods and rests on the underside of the heating plate 4.
  • the additional heater 2 is also embedded in the heating plate 4.
  • the additional heater 2 can have a plate, cylinder or other suitable shape.
  • Heating plates of the form shown in FIG. 1 are used, among other things, in the Infotec copiers of the KALLE branch of Hoechst AG. Similar arrangements result for modified forms of such heating plates.
  • a fixing gap 10 between the pressure roller 6 and the heating plate 4 is approximately 2 mm in the prior art.
  • the mode of operation of the rapid heating for secure, wipe-proof fixing and good melting of the toner images even after a short switch-on time is reinforced by a narrower fixing gap 10 in comparison to known fixing devices.
  • the fixing gap 10 can be narrowed to about 0.3 mm without the throughput of the copy sheets of paper or films being impaired and without the toner images on the copy sheets being blurred.
  • 0.3 to 0.5 mm, preferably 0.4 mm, are provided as the width of the fixing gap 10 above the heating plate 4 with the additional heater 2 for the main heater 5.5 and the pressure roller 6.
  • FIG. 3 A block diagram of the main and auxiliary heating is shown in Fig. 3.
  • the heating plate 4 contains the main heating 5.5, which in practice has an electrical heating power of 700 W to 800 W. With the main heater, the heating plate is heated to about 210 ° C in 1 1/2 to 2 minutes.
  • the main heater 5, 5 is regulated via a thermal sensor 3 and a control circuit 11. The temperature fluctuations of this regulation are typically around + 10 ° C.
  • the additional heating 2 is applied to the heating plate 4 or is integrated in the heating plate and is switched separately from the main heating.
  • the auxiliary heater has a relatively low output, for example of only 60 to 80 W. With this low output, the heating plate 4 is kept at a temperature of 150 ° C to 160 ° C, regardless of a possible copying process. This temperature of the heating plate in the waiting position is lower than the controlled temperature range of the main heating, which comprises a range from 180 ° C. to 210 ° C., with a fluctuation of + 10 ° C.
  • the temperature in the waiting position is high enough so that when copying while switching on the main heating, the optimal operating temperature for smudge-proof fixing of the copies can be reached in a short time, for example during the lead time of around 20 to 30 seconds.
  • the copies are therefore immediately smudge-proof and are output with wax-rich toners with a high solid density.
  • the temperature in the waiting position should not be lower than about 50 ° C below the lower control temperature of the main heating, so that the heating to operating temperature still takes place in the lead-up phase of the copier, i.e. within 20 to 30 seconds.
  • the circuit details of the additional heater 2 are shown in FIG. 4.
  • the main switch 7 lies with its two contacts SW1-1 and SWl-2 in the lines for the supply with mains voltage and has three switch positions, namely a switch-off position in which both contacts SW1-1 and SW1-2 are open, a switch position in which contact SW1-2 closes and contact SW1-1 is open and a key position in SW1- 2 is closed and SW1-1 closes. These three switch positions with the associated contact positions are summarized in the table below.
  • Lines rt and ws lead from the one mains cable in which there is a mains fuse to a normally open contact 33/34 and to a normally closed contact 41/42 in the relay circuit 8, which contains a two-pole relay 13/14 and 23/24 with a small contactor SKS .
  • the contactor SKS is connected to the unsecured mains cable via a connection point bl and connected to the contact points 34, 42 via the connection point b.
  • connection point a of the contactor SKS is connected to the contact point 23.
  • the protected mains cable is connected directly to contact 13/14.
  • a glow lamp which indicates the operation of the auxiliary heater 2, is connected via the contact points 14, 24.
  • the normally closed contact 41/42 of the relay circuit 8 is closed until the contactor SKS is pulled in order to then open while the normally open contact 33/34 closes.
  • the supply voltage is supplied to the auxiliary heater 2 via the relay circuit 8 and the main switch 7. Details such as thermal fuses and circuit measures, such as those required to change the voltage from 120 V to 220 V, have been omitted for clarity.
  • contact SW1-2 closes first. It remains closed until the switch is set to “off” again. Then contact SW1-1 closes briefly by pressing switch 7 and voltage is applied to small contactor SKS via fuse SW1-1, contact 41/42, b, SKS, a, SWl-2.
  • the contactor SKS operates its contacts, holds itself via contact 33/34 and switches on the glow lamp and the additional heating via contacts 23/24 and 13/14.
  • auxiliary heater 2 Since the auxiliary heater 2 is only to be operated at half the power, it is connected to voltage via the diode (1N4007), which carries out half-wave rectification.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
EP84105039A 1983-05-13 1984-05-04 Dispositif de fixation Ceased EP0125580A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833317418 DE3317418A1 (de) 1983-05-13 1983-05-13 Fixiervorrichtung
DE3317418 1983-05-13

Publications (1)

Publication Number Publication Date
EP0125580A1 true EP0125580A1 (fr) 1984-11-21

Family

ID=6198874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105039A Ceased EP0125580A1 (fr) 1983-05-13 1984-05-04 Dispositif de fixation

Country Status (4)

Country Link
US (1) US4566783A (fr)
EP (1) EP0125580A1 (fr)
JP (1) JPS59214869A (fr)
DE (1) DE3317418A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454475A3 (en) * 1990-04-26 1992-10-28 Toshiba Lighting & Technology Corporation A thermal fixing apparatus and a heater therefor

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689471A (en) * 1986-01-17 1987-08-25 Xerox Corporation Heat and pressure fuser for fixing toner images to copy substrates
US4903082A (en) * 1988-05-10 1990-02-20 Xerox Corporation Liquid ink fusing and drying system
US5043763A (en) * 1988-09-19 1991-08-27 Canon Kabushiki Kaisha Image forming apparatus having a heater in contact with a film to fix a toner image
JP2570838B2 (ja) * 1988-12-15 1997-01-16 キヤノン株式会社 画像加熱定着装置
JPH0810376B2 (ja) * 1989-06-22 1996-01-31 キヤノン株式会社 定着装置
US5463444A (en) * 1992-09-24 1995-10-31 Fuji Photo Film Co., Ltd. Heat development processor wherein steam is discharged from a heat sensitive material
US5869807A (en) * 1996-02-02 1999-02-09 Imation Corp. Apparatus and method for thermally processing an imaging material employing improved heating means
US5994671A (en) * 1996-03-21 1999-11-30 Canon Kabushiki Kaisha Image heating apparatus
US7229167B2 (en) * 2001-10-05 2007-06-12 Konica Corporation Ink jet recording apparatus, ink-jet recording method and ink jet recording medium
JP5743010B1 (ja) 2014-06-20 2015-07-01 富士ゼロックス株式会社 画像形成装置、塗布装置、塗布剤、及び搬送装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937039A1 (de) * 1968-07-22 1970-01-29 Addressograph Multigraph Fixiereinrichtung
GB2018199A (en) * 1978-03-15 1979-10-17 Canon Kk Heat-fixing device
DE3220493A1 (de) * 1981-05-30 1982-12-23 Ricoh Co., Ltd., Tokyo Fixiereinrichtung fuer ein elektrophotographisches kopiergeraet
DE3247226A1 (de) * 1981-12-21 1983-06-30 Ricoh Co., Ltd., Tokyo Einrichtung zum fixieren eines tonerbildes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54965A (en) * 1977-06-06 1979-01-06 Hitachi Ltd Voltage clamp circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937039A1 (de) * 1968-07-22 1970-01-29 Addressograph Multigraph Fixiereinrichtung
GB2018199A (en) * 1978-03-15 1979-10-17 Canon Kk Heat-fixing device
DE3220493A1 (de) * 1981-05-30 1982-12-23 Ricoh Co., Ltd., Tokyo Fixiereinrichtung fuer ein elektrophotographisches kopiergeraet
DE3247226A1 (de) * 1981-12-21 1983-06-30 Ricoh Co., Ltd., Tokyo Einrichtung zum fixieren eines tonerbildes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454475A3 (en) * 1990-04-26 1992-10-28 Toshiba Lighting & Technology Corporation A thermal fixing apparatus and a heater therefor
US5302808A (en) * 1990-04-26 1994-04-12 Toshiba Lighting & Technology Thermal fixing apparatus and a heater therefor

Also Published As

Publication number Publication date
DE3317418A1 (de) 1984-11-15
JPS59214869A (ja) 1984-12-04
US4566783A (en) 1986-01-28

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

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AK Designated contracting states

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

17P Request for examination filed

Effective date: 19850415

17Q First examination report despatched

Effective date: 19860709

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

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18R Application refused

Effective date: 19880418

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHWIERZ, PETER PAUL

Inventor name: MORAW, ROLAND, DR.

Inventor name: REBHAN, ADOLF