EP0056079B1 - Rouleau de fixage - Google Patents

Rouleau de fixage Download PDF

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Publication number
EP0056079B1
EP0056079B1 EP81107986A EP81107986A EP0056079B1 EP 0056079 B1 EP0056079 B1 EP 0056079B1 EP 81107986 A EP81107986 A EP 81107986A EP 81107986 A EP81107986 A EP 81107986A EP 0056079 B1 EP0056079 B1 EP 0056079B1
Authority
EP
European Patent Office
Prior art keywords
fixing roller
recording medium
container
wire coil
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
Application number
EP81107986A
Other languages
German (de)
English (en)
Other versions
EP0056079A1 (fr
Inventor
Eduard Mair
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.)
Siemens AG
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
Priority to AT81107986T priority Critical patent/ATE8305T1/de
Publication of EP0056079A1 publication Critical patent/EP0056079A1/fr
Application granted granted Critical
Publication of EP0056079B1 publication Critical patent/EP0056079B1/fr
Expired 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
    • G03G15/2096—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using a solvent

Definitions

  • the invention relates to a fixing roller for guiding a recording medium provided with toner through a container containing a solvent vapor of a fixing station in copying or printing devices, the fixing roller being arranged such that it can be removed from the area of the container containing the solvent vapor.
  • the object on which the invention is based is to construct the fixing roller in such a way that excessive dampening of the recording medium is avoided in the case described above.
  • This object is achieved in the case of a fixing roller of the type specified at the outset by a wire helix arranged on the surface of the fixing roller and on which the recording medium rests.
  • PTFE e.g. B. Teflon
  • the wire helix with a constant pitch, that is to say in a screw form, on the surface of the fixing roller.
  • the wire helix can be fastened in the middle of the fixing roller and, starting from this point, can be wound in the form of a screw to the end faces of the fixing roller.
  • the pitch of the wire helix can be selected such that solvent condensing on the surface of the fixing roller moves to the end faces during the rotation of the fixing roller and can drip from there.
  • the advantages of the fixing roller constructed according to the invention are that the recording medium does not touch the surface of the fixing roller or only touches it minimally. This prevents the transfer of the liquid film from the surface of the fixing roller to the recording medium. Furthermore, the resulting gap between the recording medium and the surface of the fusing roller prevents the good thermal contact between the two surfaces. This has the advantage that the recording medium runs over the roller, which may have cooled down, without a significant reduction in temperature. Otherwise, solvent vapor would additionally condense on a cooled recording medium and cause an increased dissolution of the toner image. This is not desirable in view of perfect print quality. By executing the wire helix, the solvent condensed on the surface of the fixing roller is guided to the end faces of the fixing roller and can drip off immediately.
  • FIG. 1 shows a basic structure of an electrophotographic high-speed printer.
  • a drum 10 with a photoelectric surface is evenly charged by means of a corotron 12.
  • a character generator 14, z. B. a controlled light beam from a laser
  • charge images of the characters to be printed on the drum 10 is generated.
  • the charge images are then in a developer station 16 z. B. developed according to the magnetic brush principle.
  • a transfer printing station 18 the toner images of the characters to be printed, which are now arranged on the surface of the drum 10, are placed on a recording medium 20, e.g. B. a paper web, reprinted.
  • the recording medium 20 is brought up to the surface of the drum 10.
  • the recording medium 20 is then passed through a fixing station 22.
  • the structure of the fixing station 22 is, for. B. described in more detail in DE-A-28 38 864.
  • the fixing station 22 initially consists of a container 24, in the bottom surface of which a heating device 26 is arranged. A solvent located at the bottom of the container 24 is evaporated by heating. In order to prevent the solvent vapor from escaping from the container 24, cooling coils 28 are arranged in the upper region of the container 24. In this area, the solvent vapor condenses and drips back to the bottom of the container.
  • the recording medium 20 is guided through the container 24 with the aid of a fixing roller 30. If it is to be fixed, the fixing roller 30 is in position I. The recording medium 20 is thus in the area of the solvent vapor, which can act on the recording medium and the toner image applied thereon. During printing breaks, it is advisable to remove the recording medium 20 from the area of the solvent vapor.
  • the fixing roller 30 is moved upward in the container 24 and brought into the area of the cooling coils, 28, specifically to the position 11. There, the fixing roller 30 can cool down. If printing operation now follows again, then the fixing roller 30 is brought back into position I. Then, it is inevitable that 30 solvent vapor condenses on the surface of the fixing roller. This continues until the temperature of the fusing roller has adjusted to above the dew point. If the recording medium 20 is guided directly over the surface of the fixing roller 30, then this absorbs the condensate on the surface of the fixing roller 30 and transports it out of the container 24.
  • a wire helix 32 is arranged on the surface of the fixing roller 30.
  • This consists of a PTFE, z. B. Teflon insulated wire, which is wound from a fastening point 34 on the fixing roller 30, which is approximately in the middle of the fixing roller, to the end faces 36 and 38 in screw form and is also fastened there.
  • the direction of winding is chosen such that the condensate collecting due to gravity in the lower region of the fixing roller diameter moves to the two end faces during the rotation of the fixing roller and drips from there.
  • the cross section of the wire coil 32 is selected to be circular. This forms a tapering gap 40 between the wire 32 and the surface of the fixing roller. Due to capillary forces, this gap only fills up to the contact angle typical of the combination of PTFE and solvent. This is shown in FIG. 3 at point 42. This prevents the condensate from passing over to the recording medium 30.
  • the condensate migrates into the gaps 40 between the wire helix 32 and the surface of the fixing roller 30. Due to the slope of the wire helix selected according to FIG and drips down to the bottom of the container 24. A transition of the condensate from the surface of the fixing roller 30 to the recording medium 20 is thus prevented.

Landscapes

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

Claims (6)

1. Rouleau de fixage pour guider un support d'enregistrement pourvu de toner à travers le réservoir d'un poste de fixage d'appareils de reprographie ou d'impression, contenant la vapeur d'un solvant, le rouleau de fixage étant disposé de manière à pouvoir être enlevé de la zone du réservoir contenant la vapeur du solvant, caractérisé par un fil hélicoïdal (32) sur la surface du rouleau de fixage (30) et sur lequel porte le support d'enregistrement (20).
2. Rouleau de fixage selon la revendication 1, caractérisé par le fait que le fil hélicoïdal (32) est constitué avec un fil isolé avec du PTFE.
3. Rouleau de fixage selon la revendication 1 ou 2, caractérisé par le fait que le fil hélicoïdal (32) possède une section transversale ronde.
4. Rouleau de fixage selon l'une des revendications précédentes, caractérisé par un fil hélicoïdal (32) enroulé hélicoïdalement sur la surface du rouleau de fixage (30).
5. Rouleau de fixage selon la revendication 4, caractérisé par le fait que le fil hélicoïdal (32) est fixé dans le milieu du rouleau de fixage et qu'en partant de ce point il est enroulé hélicoïdalement vers le côté frontal (36, 38) du rouleau pour être de plus fixé audit côté frontal.
6. Rouleau de fixage selon la revendication 5, caractérisé par le fait que le pas du fil hélicoïdal (32) est choisi de telle manière que du solvant qui se condense sur la surface du rouleau de fixage (30) est déplacé pendant la rotation de celui-ci sur ses côtés frontaux (36, 38).
EP81107986A 1980-12-22 1981-10-06 Rouleau de fixage Expired EP0056079B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107986T ATE8305T1 (de) 1980-12-22 1981-10-06 Fixierwalze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3048477 1980-12-22
DE3048477A DE3048477C2 (de) 1980-12-22 1980-12-22 Fixierwalze

Publications (2)

Publication Number Publication Date
EP0056079A1 EP0056079A1 (fr) 1982-07-21
EP0056079B1 true EP0056079B1 (fr) 1984-07-04

Family

ID=6119951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107986A Expired EP0056079B1 (fr) 1980-12-22 1981-10-06 Rouleau de fixage

Country Status (4)

Country Link
EP (1) EP0056079B1 (fr)
JP (1) JPS57135966A (fr)
AT (1) ATE8305T1 (fr)
DE (1) DE3048477C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593480A (en) * 1983-02-07 1986-06-10 Siemens Aktiengesellschaft Paper deflection roller for a printer or copier means functioning on the principle of electrophotography
DE3406244A1 (de) * 1984-02-21 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Laserdrucksystem fuer mehrfarben- und rueckseitendruck
US5008716A (en) * 1989-10-05 1991-04-16 Hitachi Koki Co., Ltd. Paper cooling apparatus for an electrophotographic printer
JP3290513B2 (ja) * 1993-07-29 2002-06-10 ユニコ株式会社 トナーの湿式定着方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3140160A (en) * 1956-12-03 1964-07-07 Xerox Corp Xerographic fusing and drying apparatus
US3383775A (en) * 1966-11-25 1968-05-21 Continental Can Co Hot vapor fixing of fusible powder images with azeotropic mixtures
DE2838864C3 (de) * 1978-09-06 1981-10-29 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur Fixierung von auf einem bandförmigen Aufzeichnungsträger aufgebrachten Bildern aus pulverförmigen Material mit Hilfe von Lösungsmitteldampf

Also Published As

Publication number Publication date
EP0056079A1 (fr) 1982-07-21
ATE8305T1 (de) 1984-07-15
DE3048477C2 (de) 1982-10-28
DE3048477A1 (de) 1982-07-01
JPS57135966A (en) 1982-08-21

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