EP0978386B1 - Imprimante par transfert thermique - Google Patents

Imprimante par transfert thermique Download PDF

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Publication number
EP0978386B1
EP0978386B1 EP99250237A EP99250237A EP0978386B1 EP 0978386 B1 EP0978386 B1 EP 0978386B1 EP 99250237 A EP99250237 A EP 99250237A EP 99250237 A EP99250237 A EP 99250237A EP 0978386 B1 EP0978386 B1 EP 0978386B1
Authority
EP
European Patent Office
Prior art keywords
print head
shell
edge
thermal print
thermal
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
EP99250237A
Other languages
German (de)
English (en)
Other versions
EP0978386A2 (fr
EP0978386A3 (fr
Inventor
Ulrich Hetzer
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.)
Francotyp Postalia GmbH
Original Assignee
Francotyp Postalia GmbH
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 Francotyp Postalia GmbH filed Critical Francotyp Postalia GmbH
Publication of EP0978386A2 publication Critical patent/EP0978386A2/fr
Publication of EP0978386A3 publication Critical patent/EP0978386A3/fr
Application granted granted Critical
Publication of EP0978386B1 publication Critical patent/EP0978386B1/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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/335—Structure of thermal heads
    • B41J2/33505—Constructional details
    • B41J2/3353—Protective layers
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/335—Structure of thermal heads
    • B41J2/3355—Structure of thermal heads characterised by materials
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/335—Structure of thermal heads
    • B41J2/33555—Structure of thermal heads characterised by type
    • B41J2/33565—Edge type resistors
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00467—Transporting mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00524—Printheads
    • G07B2017/0054—Thermal printhead

Definitions

  • the invention relates to a thermal transfer printing device for a franking and / or addressing machine.
  • thermal transfer printing the print carrier on the side of the counter roll and an ink ribbon on the side of the thermal print head are usually guided between a thermal print head and a counter roller arranged opposite it, the print head having a correspondingly large force on the ink ribbon and this must again rest on the print carrier, to transfer the melted ink particles from the ink ribbon to the print carrier.
  • the dye can be bound on the ink ribbon in a wax layer or more recently in a layer made of polyimide.
  • An office printer based on the thermal transfer printing principle works with constant pressure conditions, such as the same pressure force for the thermal print head, single sheets with prescribed paper type, in particular paper thickness and constant paper guidance.
  • franking and / or addressing machines often change the nature of the letters, in particular their thickness and rigidity due to different fillings and the paper quality of the envelopes.
  • the pressure conditions become particularly critical when processing airmail, since the envelopes used are often very soft and delicate. A gentle operation would be possible by reducing the pressure force, but the print quality would then deteriorate accordingly.
  • the contact pressure even has to be increased compared to the normal letters in order to achieve the same print quality.
  • higher contact pressures result in greater wear on the thermal print head and consequently in a correspondingly shorter service life and can also lead to damage to the letters.
  • thermo printer compare EP 0 787 592 A1, in which the letters are guided lying flat along the broad side of a thermal print head.
  • the heating elements are arranged in the middle of the plate-shaped printhead in a row transversely to the transport direction of the letter, which is pressed together with the ink ribbon against the heating elements by means of a spring-mounted roller.
  • the broad side is much larger in relation to the area with the heating elements, so that the ribbon and letter can be held against each other even longer after printing. This lettering is gentle on paper due to the large area, but the color particles are more difficult to separate from the ribbon. Compensation is only possible through a longer thermal exposure time, which in turn means a lower transport speed. Due to the larger contact area, a larger contact pressure is also required, which in turn causes the thermal print head to wear out more quickly.
  • a thermal transfer printing device is also known, see EP 0 434 340 B1, in which the heating elements on one edge of a Thermal print head are attached and the same only with this edge in the direction of a counter roller.
  • the ribbon is placed over one of the Edge downstream roller swung away from the letter.
  • the ink ribbon stays too long on the letter.
  • the letter is so mechanically stressed will that for envelopes made of thin paper and with multiple layers softer filling folds up to damage can occur. This also has a correspondingly poorer print quality Episode.
  • thermal printer is also known, see EP 0 329 478, in which the heating elements are attached directly to the narrow end edge of a flat thermal printing head and the ink ribbon is led away from the printing medium immediately after the heating element print bar.
  • This thermal print head represents the so-called “corner edge type", while the two solutions described at the beginning correspond to the so-called "flat type”.
  • the purpose of the invention is to improve the functional properties and an enlargement of the area of application.
  • the invention has for its object a device of the type mentioned at the outset, with which regardless of the Condition of the letters and at high transport speeds same good print quality is achieved.
  • the Wear of the thermal print head can be kept as low as possible.
  • a letter A is arranged between an ink ribbon 4 and a counter roller 3.
  • a thermal print head 1 and a shell 2 located on the underside thereof lie against the ink ribbon 4.
  • the thermal print head 1 is of the corner-edge type and only touches the ink ribbon 4 with its edge 12, to which a printing strip 11 comprising individual heating elements 111 is attached, see also FIG. 2.
  • the tray 2 touches the ink ribbon 4 with its bottom surface 21 only in an area that is adjacent to the edge 12 or pressure bar 11.
  • the shell 2 extends on the two outer edges to just before the edge 12 and is provided with rounded corners 212.
  • the shell 2 and the thermal print head 1 are made wider than the ink ribbon 4.
  • the letter A is gently smoothed due to the rounded edges of the tray 2.
  • the shell 2 expediently consists of a rustproof metal, the bottom surface 21 being smoothed in the sliding area of the ink ribbon 4 or the letter A.
  • a version with a plastic, acetal copolymer or with a Teflon-coated metal is also possible.
  • the ribbon 4 is guided in front of the tray 2 around a deflection roller 5 so that the lower edge of the deflection roller 5, bottom surface 21 and pressure bar 11 lie in one plane, see also FIG. 3.
  • the ink ribbon 4 is in a conventional ribbon cassette, not shown stored with a supply reel for fresh and a take-up reel for used ribbon. From the unwinding spool, the ink ribbon 4 passes around the deflection roller 5 along the bottom surface 21 to the edge 12 with the pressure bar 11, around the latter to the winding spool in the direction of the arrow.
  • the counter roller 3 is axially parallel under the edge 12. Both are adjustable relative to one another under pressure force in accordance with the pressure required for the heat effect on the ink ribbon 4 in order to achieve a reliable transfer of the color particles onto the letter. Deflection roller 5 and counter roller 3 are rotated according to the direction of the arrow shown. In the case of the counter roller 3, an elastic covering 31 with a good coefficient of friction is applied to a solid base body 32, which in turn surrounds an axis 33.
  • the pressure bar 11 consists of equidistant heating elements 111 attached to the edge 11, as can be clearly seen in the magnifying glass view.
  • the colored elements on the ink ribbon 4 are partially dissolved with the heating elements 111 and then the colored particles are transferred to the letter A by means of adhesion.
  • Fig. 3 it can be seen how the shell 2 by means of a single screw connection 23 attached to the thermal print head 1 and with the rounded Edge 211 via an insulation layer 22 on the underside 13 the same is supported near the edge 12.
  • the heating elements 111 include the edge 12 in the form of the pressure bar 11.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Electronic Switches (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)

Claims (7)

  1. Dispositif d'impression par transfert thermique pour des machines à affranchir et/ou à adresser avec les caractéristiques suivantes:
    on prévoit une tête d'impression thermique (1) du type Corner-Edge dont des éléments de chauffage (111) forment sur une arête (12) une barre d'impression (11) qui est orientée paraxialement vers un contre-rouleau (3) en étant disposé le plus proche de celui-ci, et autour de laquelle est directement guidé le ruban encreur (4) en s'éloignant de la lettre (A),
    on prévoit sur la partie inférieure (13) de la tête d'impression thermique (1), adjacente au contre-rouleau (3), un bac (2) qui s'étend directement jusqu'à la barre d'impression (11) et qui est disposé avec la zone de la surface de fond (21) proche de la barre d'impression (11) à peu près à la même hauteur que la barre d'impression (11),
    la tête d'impression thermique (1) y compris le bac (2) et le contre-rouleau (3) sont disposés d'une manière relativement réglable l'un par rapport à l'autre.
  2. Dispositif selon la revendication 1, caractérisé en ce que le bac (2), dans la zone proche de la barre d'impression (11), au bord (211), vers la tête d'impression thermique (1), est exécuté d'une manière arrondie et plus large que celle-ci et présente dans le prolongement de l'arête (12) des coins (212) arrondis.
  3. Dispositif selon la revendication 1, caractérisé en ce que le contre-rouleau (3) est plus long que la barre d'impression (11) mais plus court que la longueur de l'arête (12) de la tête d'impression thermique (1).
  4. Dispositif selon la revendication 1, caractérisé en ce que le bac (2) est fixé d'une manière amovible sur la tête d'impression thermique (1).
  5. Dispositif selon la revendication 1 à 2, caractérisé en ce que le bac (2) est en métal inoxydable et est soutenu dans la zone proche de la barre d'impression (11), sur la tête d'impression thermique (1), par l'intermédiaire d'une couche d'isolation (22), et en ce que la surface de fond (21) du bac (2) est lissée dans cette zone.
  6. Dispositif selon la revendication 1 à 2, caractérisé en ce que le bac (2) est en plastique avec un faible coefficient de friction comme du copolymère acétale avec téflon.
  7. Dispositif selon la revendication 1 à 2, caractérisé en ce que le bac est en métal, comme de l'aluminium, plaqué au téflon.
EP99250237A 1998-08-06 1999-07-15 Imprimante par transfert thermique Expired - Lifetime EP0978386B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19835544A DE19835544C1 (de) 1998-08-06 1998-08-06 Thermotransfer-Druckvorrichtung
DE19835544 1998-08-06

Publications (3)

Publication Number Publication Date
EP0978386A2 EP0978386A2 (fr) 2000-02-09
EP0978386A3 EP0978386A3 (fr) 2001-03-07
EP0978386B1 true EP0978386B1 (fr) 2002-08-14

Family

ID=7876660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99250237A Expired - Lifetime EP0978386B1 (fr) 1998-08-06 1999-07-15 Imprimante par transfert thermique

Country Status (3)

Country Link
US (1) US6052139A (fr)
EP (1) EP0978386B1 (fr)
DE (2) DE19835544C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019070A1 (de) * 2004-04-20 2005-11-17 Avery Dennison Corp., Pasadena Thermotransfer-Drucker mit Einzelblatteinzug
US8383309B2 (en) * 2009-11-03 2013-02-26 Xerox Corporation Preparation of sublimation colorant dispersion
US8709696B2 (en) 2010-08-16 2014-04-29 Xerox Corporation Curable sublimation marking material and sublimation transfer process using same
US9372425B2 (en) 2010-08-16 2016-06-21 Xerox Corporation Curable sublimation toner and sublimation transfer process using same
US8337007B2 (en) 2010-08-16 2012-12-25 Xerox Corporation Curable sublimation ink and sublimation transfer process using same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0289115A1 (fr) * 1987-03-02 1988-11-02 Kabushiki Kaisha Toshiba Appareil d'impression par transfert électrothermique
US4947183A (en) * 1987-11-14 1990-08-07 Ricoh Company, Ltd. Edge type thermal printhead
EP0329478A3 (fr) * 1988-02-18 1991-10-16 Kabushiki Kaisha Toshiba Imprimante d'enregistrement thermique
US4968996A (en) * 1988-12-01 1990-11-06 N. H. K. Spring Co., Ltd. Thermal printhead
GB8928990D0 (en) * 1989-12-22 1990-02-28 Alcatel Business Systems Thermal transfer printing
US5775820A (en) * 1994-05-27 1998-07-07 Kabushiki Kaisha Tec Thermal printer having a press releasing mechanism
GB9501730D0 (en) * 1995-01-30 1995-03-22 Neopost Ltd Franking apparatus and mail transport thereof
GB9601898D0 (en) * 1996-01-31 1996-04-03 Neopost Ltd Printing apparatus

Also Published As

Publication number Publication date
EP0978386A2 (fr) 2000-02-09
DE59902325D1 (de) 2002-09-19
DE19835544C1 (de) 2000-10-26
US6052139A (en) 2000-04-18
EP0978386A3 (fr) 2001-03-07

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