EP0746470B1 - Dispositif d'impression par transfert thermique permettant de transferer une image sur un support d'impression - Google Patents

Dispositif d'impression par transfert thermique permettant de transferer une image sur un support d'impression Download PDF

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Publication number
EP0746470B1
EP0746470B1 EP95901344A EP95901344A EP0746470B1 EP 0746470 B1 EP0746470 B1 EP 0746470B1 EP 95901344 A EP95901344 A EP 95901344A EP 95901344 A EP95901344 A EP 95901344A EP 0746470 B1 EP0746470 B1 EP 0746470B1
Authority
EP
European Patent Office
Prior art keywords
fabric
fabric tape
transfer printing
thermal transfer
printing device
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
EP95901344A
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German (de)
English (en)
Other versions
EP0746470A1 (fr
Inventor
Manfred Wiedemer
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
Oce Printing Systems GmbH and Co KG
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 Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP0746470A1 publication Critical patent/EP0746470A1/fr
Application granted granted Critical
Publication of EP0746470B1 publication Critical patent/EP0746470B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/0057—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material where an intermediate transfer member receives the ink before transferring it on the printing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material

Definitions

  • the invention relates to a thermal transfer printing device for transferring a print image to a recording medium in a printing or copying machine.
  • the heating elements are activated by a control unit in accordance with the print image to be reproduced. Rapid heating of the ink causes bubbles to form in the openings of the ink film, as a result of which the ink is immediately expelled from the openings in the direction of the recording medium.
  • the printing ink In the known thermal transfer printing device, however, considerable demands are placed on the printing ink.
  • the printing ink must be thermally stable up to approximately 400 ° C.
  • the load on the surface of the recording medium also increases in accordance with the temperature of the printing ink. It is therefore only possible to use record carriers that meet these high requirements. Since the heating process is limited to the relatively small area of the print head, the achievable printing speed is also limited accordingly.
  • thermal transfer printing device with several thermal printheads is known. Each thermal print head is used to transfer an ink to a recording medium. Each thermal print head is assigned a cassette which has an ink reservoir in which the openings of an ink film are filled with ink. The ink film is passed over the thermal print head, where the ink is heated and transferred to a recording medium by bubbling. With multi-color printing, several transfer points are required depending on the number of colors.
  • the present invention has for its object to show a thermal transfer printing device for transferring a print image to a record carrier in a printing or copying machine, which allows the use of conventional, large thermal stresses insufficient inks, ensures a low load on the record carrier and allows a high printing speed .
  • the thermal transfer printing device makes it possible to use conventional dyes in thermal transfer printing.
  • the heat effect of the heating device provided at the transfer printing point is limited to the liquid located in the first fabric band. This liquid is evaporated and thereby partially drives the printing ink out of the second fabric tape in the direction of the recording medium.
  • the ink striking the recording medium is only slightly warmed, which means that the recording medium is only slightly thermally stressed. Since the print image is generated by evaporation of the liquid in the first fabric belt at two different locations and thus the total energy for generating the print image is given off at two spaced-apart locations, the thermal load on the heating device located at the transfer location is comparatively low.
  • the division of the printing energy can also be used to increase the printing speed.
  • the fabric tapes have the property of absorbing liquid or printing ink and partially releasing it again.
  • the term fabric tape therefore also refers to tapes with a non-regular structure, such as a flow, and all other materials that have the functionality mentioned.
  • the thermal transfer printing device contains a dyeing station in which an ink-carrying roller can be brought into contact by selectively moving a counter-pressure roller toward the ink-carrying roller with the second fabric tape located between the roller and the counter-pressure roller. This ensures that printing ink is only applied at the points on the second fabric band where this is necessary. For example, only the locations of a second web of fabric in endless form need to be re-applied with printing ink from which ink had been taken in a previous transfer printing operation.
  • At least two ink-bearing rollers are arranged one behind the other in the running direction of the second fabric belt.
  • different colors can be applied to the second fabric tape in sections at the desired locations. Multi-color printing is therefore possible with only one color-bearing fabric tape. Sections which are not wetted with printing ink are preferably left free between the individual sections of different coloring on the second fabric band. In the event of a print pause, these color-free areas are then positioned over the heating device of the transfer printing point.
  • the print image transfer point contains a thermal comb with heating elements which can be activated independently of one another, a heating element corresponding to a pixel.
  • the liquid from the first fabric band can be partially evaporated according to the available pressure information.
  • the dot size and color density, which is to be achieved in the subsequent transfer printing in the transfer printing station, can be determined both by varying the heating energy on the heating device of the transfer printing station and by varying the heating energy of the heating elements of the thermal comb.
  • Water is suitable as the non-toxic liquid with which the first fabric band can be wetted. When water evaporates, there are no toxic vapors that could affect the ambient air of the printer or the functional elements inside the printer. The water vapor can be removed by a suction device. However, other non-toxic liquids that have a corresponding evaporation point and do not cause any harmful environmental influences are also suitable.
  • the figure shows a thermal transfer printing device with a first and a second fabric ribbon.
  • the first fabric belt 1 is designed as an endless belt. It is clamped between two rollers 10, 16, the axes of which run parallel. One of the rollers 10 is assigned to the transfer printing point 12, and the other roller 16 is assigned to a dampening unit 2.
  • the first fabric tape 1 is at least as wide as the widest record carrier 9 to be processed. The length of the first fabric tape 1 is selected so that the distance between the two rollers 10, 16, on which the first fabric tape 1 is stretched, is so great that a print image transfer point 3 can be arranged in this distance range.
  • the print image transfer point 3 contains a heating device 13 with which, according to the available print information, a non-toxic liquid 19 contained in the first fabric band 1 can be partially evaporated.
  • a thermal comb 13 serves as the heating device 13.
  • the thermal comb 13 contains a plurality of heating elements, each of which can be assigned a pixel of the printing information.
  • a laser or an infrared light source, which can be controlled accordingly, could also be used as the heating device 13.
  • the thermal comb 13 extends over the entire width of the first fabric band 1.
  • the first fabric band 1 is guided directly over the thermal comb 13.
  • a suction device 18 is provided which sucks off the vaporized liquid 19.
  • the liquid 19, for example water, can be condensed in a condensation device (not shown) arranged downstream of the suction device 18 and can be fed back to the dampening unit 2.
  • the second fabric belt 4 like the first fabric belt 1, is designed as an endless belt.
  • the second fabric tape 4 consists of polyester or metallized polyester with a fabric thickness of ⁇ 100 microns.
  • the second fabric tape 4 has at least a width which corresponds to the width of the widest record carrier 9 to be printed.
  • the second fabric belt 4 is guided over three rollers 10, 20, 21, the axes of which are parallel to one another. In the area of the heating roller 10, the first fabric belt 1 is located between the heating roller 10 and the second fabric belt 4.
  • the direction of movement and speed of the belts 1, 4 are identical.
  • the second fabric tape 4 passes through a dyeing station 5.
  • four different printing inks 11 are optionally applied to the second fabric tape 4.
  • the inking station 5 can be constructed in a modular manner, as a result of which any number of printing inks 11 can be applied to the second fabric tape 4.
  • the ink is applied in each case by an ink-bearing roller 7, which is arranged on one side of the second fabric belt 4.
  • the ink-bearing roller 7 is assigned a counter-pressure roller 6. This counter pressure roller 6 is movable perpendicular to the surface of the second fabric belt 4. If ink is to be applied, the counter-pressure roller 6 is moved to the ink-bearing roller 7.
  • the counter-pressure roller 6 hits the second fabric belt 4 and moves it to the ink-bearing roller 7. This brings the second fabric belt 4 and the ink-bearing roller 7 into contact, as a result of which ink 11 is transferred from the ink-bearing roller 7 to the second fabric belt 4 .
  • the ink-bearing roller 7 is always wetted with printing ink 11 by a rolling movement on a supply roller 22, which is immersed in an ink supply 11.

Landscapes

  • Electronic Switches (AREA)
  • Coloring (AREA)

Abstract

Une image est transférée sur une bande de tissu (1) pouvant être imprégnée d'un liquide (19), par évaporation partielle du liquide (19) dont ledit tissu est imprégné, dans un poste de transfert d'image (3). Dans un poste de duplication (12) subséquent, la première bande de tissu (1) se trouve entre un dispositif chauffant (10) et une seconde bande de tissu (4). Cette dernière (4) est imprégnée d'encre d'impression (11). L'encre d'impression (11) est chassée de la seconde bande de tissu (4) et est appliquée sur un support d'impression (9) par le liquide (19) resté dans la première bande de tissu (1), qui représente l'image et que l'on fait évaporer dans le poste de duplication (12).

Claims (10)

  1. Dispositif d'impression par transfert thermique permettant de transférer une image d'impression sur un support d'enregistrement (9) dans un appareil d'impression ou de reproduction, comprenant :
    - une première bande de tissu (1) qui peut être mouillée avec un liquide (19),
    - une zone (3) de transfert d'image au niveau de laquelle le liquide (19) peut être partiellement évaporé de la première bande de tissu (1) sur une surface correspondant à l'information d'impression présente, et
    - une deuxième bande de tissu (4) sur laquelle de l'encre d'impression (11) peut être transférée à un poste d'encrage (5), et
    - une zone (12) de report d'impression, dans laquelle :
    - la première bande de tissu (1) et la deuxième bande de tissu (4) sont entraînées en commun, en superposition, en passant sur un dispositif de chauffage (10), la première bande de tissu (1) étant en contact physique avec le dispositif de chauffage (10), de sorte que le liquide (19) qui se trouve dans la première bande de tissu (1) est alors évaporé, et
    - le support d'enregistrement (9) peut être pressé par un élément presseur (8) en direction du dispositif de chauffage (10) et appliqué contre la deuxième bande de tissu (4).
  2. Dispositif d'impression par transfert thermique selon la revendication 1, comprenant une première bande de tissu (1) faite d'un tissu de fil d'acier inoxydable.
  3. Dispositif d'impression par transfert thermique selon une des revendications 1 et 2, comprenant pour constituer la deuxième bande de tissu (4) un tissu de polyester d'une épaisseur de tissu inférieure à 100µm.
  4. Dispositif d'impression par transfert thermique selon une des revendications précédentes, comprenant un dispositif de chauffage s'étendant transversalement à la direction de transport (14) du support d'enregistrement (9) et qui est constitué par un cylindre (10) pouvant être chauffé.
  5. Dispositif d'impression par transfert thermique selon une des revendications précédentes, comprenant un poste d'encrage (5) dans lequel un cylindre porteur d'encre de couleur (7) peut être mis en contact physique avec la deuxième bande de tissu (4) sous l'effet d'un déplacement commandé sélectivement d'un rouleau de contre-pression (6).
  6. Dispositif d'impression par transfert thermique selon la revendication 5, dans le poste d'encrage (5) duquel au moins deux cylindres porteurs d'encre de couleur (7) sont disposés l'un à la suite de l'autre dans la direction du défilement de la deuxième bande de tissu (4).
  7. Dispositif d'impression par transfert thermique selon une des revendications précédentes, comprenant une zone (3) de transfert d'image d'impression qui présente un peigne thermique (13) possédant des éléments chauffants pouvant être activés indépendamment les uns des autres, un élément chauffant correspondant à un pixel.
  8. Dispositif d'impression par transfert thermique selon une des revendications précédentes, comprenant un mécanisme de mouillage (2) disposé au droit de la première bande de tissu (1) et dans lequel la première bande de tissu (1) peut être mouillée d'un liquide non toxique (19).
  9. Dispositif d'impression par transfert thermique selon la revendication 8, dans lequel le mécanisme de mouillage (2) comprend deux cylindres (16, 17) qui roulent l'un sur l'autre, entre lesquels la première bande de tissu (1) peut être entraînée et dont l'un transfère le liquide (19) sur la première bande de tissu (1).
  10. Dispositif d'impression par transfert thermique selon une des revendications précédentes, comprenant des bandes de tissu (1, 4) constituées par dés bandes sans fin.
EP95901344A 1994-02-23 1994-11-29 Dispositif d'impression par transfert thermique permettant de transferer une image sur un support d'impression Expired - Lifetime EP0746470B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4405840 1994-02-23
DE4405840 1994-02-23
PCT/DE1994/001418 WO1995023065A1 (fr) 1994-02-23 1994-11-29 Dispositif d'impression par transfert thermique permettant de transferer une image sur un support d'impression

Publications (2)

Publication Number Publication Date
EP0746470A1 EP0746470A1 (fr) 1996-12-11
EP0746470B1 true EP0746470B1 (fr) 1997-10-22

Family

ID=6511004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95901344A Expired - Lifetime EP0746470B1 (fr) 1994-02-23 1994-11-29 Dispositif d'impression par transfert thermique permettant de transferer une image sur un support d'impression

Country Status (5)

Country Link
US (1) US5801742A (fr)
EP (1) EP0746470B1 (fr)
JP (1) JPH09509112A (fr)
DE (1) DE59404446D1 (fr)
WO (1) WO1995023065A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH548866A (fr) * 1971-11-17 1974-05-15 Battelle Memorial Institute Dispositif d'impression avec une encre liquide, conductrice d'electricite.
JPS61197246A (ja) * 1985-02-28 1986-09-01 Toshiba Corp 記録装置
EP0195863B1 (fr) * 1985-03-27 1989-10-18 Elm Co., Ltd. Imprimante à jet d'encre thermique
EP0202370B1 (fr) * 1985-05-20 1990-05-16 Elm Co., Ltd. Tête d'impression
US4731619A (en) * 1985-07-18 1988-03-15 Kabushiki Kaisha Toshiba Thermal printing head
JP2777900B2 (ja) * 1989-03-15 1998-07-23 富士通株式会社 記録装置
JPH03254948A (ja) * 1990-03-06 1991-11-13 Nec Corp サーマルインクジエツト画像形成装置
US5159357A (en) * 1990-06-26 1992-10-27 Eastman Kodak Company Non-impact printer for recording in color
US5175568A (en) * 1990-10-24 1992-12-29 Ricoh Company, Ltd. Process and apparatus for forming image on novel recording medium
JPH0664289A (ja) * 1992-08-24 1994-03-08 Oki Electric Ind Co Ltd インクシート再生方法及びインクシート再生型熱転写記録装置

Also Published As

Publication number Publication date
WO1995023065A1 (fr) 1995-08-31
JPH09509112A (ja) 1997-09-16
US5801742A (en) 1998-09-01
EP0746470A1 (fr) 1996-12-11
DE59404446D1 (de) 1997-11-27

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