EP0943443B1 - Procédé et appareil d'impression sur papier thermosensitif - Google Patents

Procédé et appareil d'impression sur papier thermosensitif Download PDF

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Publication number
EP0943443B1
EP0943443B1 EP99104836A EP99104836A EP0943443B1 EP 0943443 B1 EP0943443 B1 EP 0943443B1 EP 99104836 A EP99104836 A EP 99104836A EP 99104836 A EP99104836 A EP 99104836A EP 0943443 B1 EP0943443 B1 EP 0943443B1
Authority
EP
European Patent Office
Prior art keywords
temperature
line
erasure
phase
thermopoint
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
EP99104836A
Other languages
German (de)
English (en)
Other versions
EP0943443A2 (fr
EP0943443A3 (fr
Inventor
Wolfgang Gloger
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.)
Boewe Cardtec GmbH
Original Assignee
Boewe Cardtec 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 Boewe Cardtec GmbH filed Critical Boewe Cardtec GmbH
Publication of EP0943443A2 publication Critical patent/EP0943443A2/fr
Publication of EP0943443A3 publication Critical patent/EP0943443A3/fr
Application granted granted Critical
Publication of EP0943443B1 publication Critical patent/EP0943443B1/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
    • B41J2/35—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 providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control
    • B41J2/365—Print density control by compensation for variation in temperature

Definitions

  • the invention relates to a method for printing a carrier a thermochromic layer, which may have been previously printed, wherein the carrier with the thermochromic layer on a Thermopoint is moved point-by-point, whose Thermopoints electrically controlled according to a Druckinuster be heated, that to be deleted layer points during a Deletion time above a predetermined extinguishing temperature and to be printed Layer points for a color change over a higher Color change temperature can be spent.
  • Such a method of operating a photochromic material operating thermal printer is known from US-A-5 555 010 known.
  • the color change time and the deletion time So follow one after the other, and the heating of all resistances on the high pressure temperature is energy-consuming and heats the entire device considerably.
  • a Method and device are known in which a heating plate, the thermostatically heated electrically to the extinguishing temperature is, in a quenching station, the Thermochromic layer over the entire surface contacted and so spends in the colorless ground state. at a subsequent pass under a thermal dot line the label then takes place. So there are two Processing stations, possibly housed in a device are, and a correspondingly long deletion and labeling time needed, with the dot lines each for the full heating time to the writing temperature one by one in the writing position remain.
  • thermopoints controlled so be heated that in a first extinguishing phase, all fully are energized until the extinguishing temperature is reached and then in a writing phase only those who each print the Layer points are associated with, are energized until they over the Farbumschlagtemperatur are heated, and then pulse-pause-controlled, this until the end of the color change, over the Farbumschlagtemperatur kept oscillating, are energized.
  • a known color transfer printing device equipped with a thermal dot line is, even for the novel labeling method a Use a Themochromic layer if necessary Control Supplement is installed. If a sensor provided which signals the presence of a ribbon its ribbon error signal to switch to the Thermochromic control program be used.
  • the extinguishing phase is for the dots to be printed practically a preheat phase, to the the correspondingly shorter printing phase connects seamlessly.
  • the control register of the heating points of the thermopoint becomes for the deletion phase in each case completely with one each One is charged and receives for the subsequent printing phase the respective dot pattern.
  • thermopoint the heating of the card and the carrier of the thermopoint considered and on the other hand, for good heat dissipation from and Heat distribution in the writing head and the writing head carrier taken care of.
  • the commercial print heads are on a good constructed thermally conductive ceramic carrier. This one will open a light metal block for heat distribution and heat dissipation contacted to the enclosing housing heat transfer.
  • the consideration of the heating of the card over the Marking time of a card happens in a simple way so that the initially selected deletion time with each one after the other row processing took place predetermined time limit is reduced until one Minimum extinguishing time is reached.
  • the start and the end value and the time stamp are from the thermal properties the respective construction in operation easy to determine. An indication of this is given by the initial and final temperatures a labeling process in relation to the extinguishing temperature.
  • Another control process brings the temperature of the Heating points, which are small electrical resistances, in one predetermined range, however, above the color change temperature is below an upper limit temperature at which the layer would be damaged.
  • a pulse length modulation of the supply voltage is preferred the heating elements provided.
  • the respective Schupulsus is about twice as long as the break.
  • the heat pulse length was 9 ⁇ s and the pause was 5 ⁇ s. Total were 15 pulse pause cycles provided.
  • the temperature at the heating point fluctuated around 170 ° C.
  • Fig. 1 shows a cylindrical holder (H) of a Thermal head (10), whose thermal point line (TZ) by a Slot of the holder (H) protrudes coat side.
  • the Holding cylinder (H) is in a flange (12) by a Clamping screw (11) held like a clamp; the flange (12) used for attachment in a not shown Card conveying device, the map to be labeled (K), which carries the thermochromic layer (TS), perpendicular to the image Line by line past the topic point line (TZ).
  • K the map to be labeled
  • TS thermochromic layer
  • the thermal labeling head (10) consists of thermally conductive Ceramic and is made with a massive head carrier (9) Aluminum or other good heat conducting metal with the Holder (H) connected, which leads the heat to the outside, the is introduced in the heating of the heating elements.
  • Fig. 2 shows a side view of the front side of the Holder (H) with the surrounding flange (12) and the Clamp clamp (11).
  • the Head (10) fixed with its thermopoint (TZ) looking out of the holding cylinder.
  • the map (K) to be inscribed is shown in the Transport direction (TR) is gradually promoted.
  • FB ribbon with a Transfer ink.
  • An optical-electrical ribbon sensor (2) signals each presence or absence of the ink ribbon (FB), whereby the control device respectively selects the appropriate control program.
  • Fig. 3 shows a view of the flange (12).
  • Holder (H) is the head carrier (9) with the Thermo labeling head (10) to see.
  • thermally conductive head carrier (9) is a thermal sensor (7) attached, which is preferably a PTC resistor, ie one with a positive temperature coefficient.
  • FIG 4 shows a block diagram of a control device of FIG thermally controlled labeling line of the Labeling head (10).
  • the individual pressure points exist from electrical resistances (R1 - RN), each in known manner of an associated transistor (T1 - TN) be energized, depending on how each of the condition in the associated register element of a control register (RS1 - RSN) is.
  • control register (RS1-RSN) is on Shift register into which the pressure information (DI) of the each line to be printed by the control device (ST) is to be pushed.
  • the information in the Shift register line is respectively in an associated Gate (G1 - GN) associated with a heating control signal (HZ), its output to the control transistor (T1 - TN) is assigned accordingly assigned.
  • the control device (ST) contains a clock (CL), by controlling the control program flow.
  • CL clock
  • DÜ data transmission line
  • the control program will depend on the signal of the Ribbon sensor (2) on the inscription of the Thermochromic layer set.
  • Fig. 5 shows a Bestromungssignal a heating resistor in time course.
  • LZ initial erasure time
  • R1 - RN full energization of all heating elements
  • HP heating phases
  • the pulse-pause ratio is chosen so that the temperature the heating elements to a temperature of about 170 ° C, ie over the color change temperature, rises and then in one Range above the color change temperature oscillates.
  • the power is completely turned off, creating a rapid cooling below the extinguishing temperature occurs. Thereafter, the next line below the writing point line promoted and the whole process begins again, taking again when deleting all and writing to the corresponding pressure points are given.
  • Thermochromic layer (TS) Since the entire heating elements of the write head (10) by the extinguishing process are heated and, accordingly, the Thermochromic layer (TS) has an elevated temperature, this has an increased lubricity, and thus become the layer and the head during the further transport of the Wearer of the layer spared; it results in a kind Lubrication effect.

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Claims (12)

  1. Procédé d'impression d'un support (K) d'une couche thermochromique (TS) qui, le cas échéant, était déjà imprimé, ledit support (K) avec la couche thermochromique (TS) passant, ligne par ligne, par une ligne de points de chauffage, dont les points de chauffage (R1 - RN) sont chauffés électriquement, de manière contrôlée, conformément à un motif d'impression, de manière à ce que les points à effacer de la couche soient amenés, pendant un temps d'effacement, au-dessus d'une température d'effacement prédéterminée et les points à imprimer de la couche soient amenés, pendant un temps de virage de la couleur, au-dessus d'une température, plus élevée, de virage de la couleur,
    caractérisé en ce que
    les points de chauffage (R1 - RN) sont chauffés de manière contrôlée de telle sorte que, lors de chaque phase d'effacement (LZ) ils sont tous entièrement alimentés en courant jusqu'à ce que la température d'effacement soit atteinte et, ensuite, au cours d'une phase d'écriture (SZ) seuls ceux respectivement associés aux points à imprimer de la couche sont alimentés en courant jusqu'à ce qu'ils soient chauffés au-dessus de la température de virage de la couleur, et ceux-ci sont finalement alimentés en courant en étant maintenus de manière oscillante au-dessus de la température de virage de la couleur, jusqu'à la fin du temps de virage de la couleur, par modulation en durée d'impulsions ou par commande par intervalles d'impulsions.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    lors de la modulation en durée d'impulsions le rapport impulsion-intervalle entre impulsions est d'environ 2 à 1.
  3. Procédé selon la revendication 2,
    caractérisé en ce que
    le rapport impulsion-intervalle entre impulsions est d'environ 9 µs à 5 µs.
  4. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    l'intervalle d'impulsions est chaque fois réglé entre un rapport minimal et un rapport maximal, en dépendance du nombre de points de chauffage (R1 - RN) à alimenter en courant par rapport à leur nombre total (N) de manière à ce que la température de virage de la couleur dans la phase d'écriture (SZ) soit légèrement dépassée.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les éléments de chauffage des points de chauffage (R1 - RN) sont exploités, chacun, de manière contrôlée, par une tension de service (UV) qui est réglée en fonction d'une température moyenne correspondante d'un support (9) des lignes de points de chauffage (TZ).
  6. Procédé selon l'un des revendications précédentes,
    caractérisé en ce que
    la longueur de la phase d'effacement (LZ) est réduite chaque fois, pas à pas, à partir d'un temps d'effacement maximal, prédéterminé, en fonction du nombre respectif de lignes d'écriture qui se suivent, jusqu'à un temps d'effacement minimal, prédéterminé, de manière à ce que la température d'effacement soit juste atteinte dans la phase d'effacement (LZ).
  7. Procédé selon l'un des revendications précédentes,
    caractérisé en ce que
    la couche thermochromique (TS) est chauffée à environ 120° C à l'endroit de la ligne de points chauffants , dans la phase d'effacement (LZ), et que les points à écrire continuent d'être chauffés dans la phase d'écriture suivante (SZ) jusqu'à environ 170° C.
  8. Dispositif pour l'exécution du procédé selon l'une des revendications 1 à 7, dans lequel un support (K) revêtu d'une couche thermochromique (TS) est soumis, ligne par ligne, successivement, à une ligne de points de chauffage avec une ligne de points de chauffage (R1 - RN), dont les résistances de chauffage sont raccordées chacune, par l'intermédiaire d'un transistor (T1 - TN), qui est respectivement commandé par un élément d'un registre d'écriture (RS1 - RSN) et un signal commandant par intervalle d'impulsions (HZ) pendant une phase d'écriture (SZ), à une tension de service (UV) d'un bloc d'alimentation (N), la ligne de points de chauffage (R1 - RN) étant disposée sur une tête thermique (10) qui contient un détecteur de température (7) qui, lors de l'élévation de la température, a pour effet de réduire l'alimentation en courant,
    caractérisé en ce que
    que le détecteur de température (7) est raccordé au bloc d'alimentation (N), en commandant la tension de service (UV), et que tous les transistors (T1 - TN) sont d'abord amenés en conduction complète dans une phase d'effacement (LZ) à laquelle fait suite une phase d'écriture (SZ).
  9. Dispositif selon la revendication 8,
    caractérisé en ce que
    le détecteur de température (7) est une résistance à coefficient positif de température PTC.
  10. Dispositif selon la revendication 9,
    caractérisé en ce que
    le détecteur de température (7) est connecté en parallèle et / ou en série avec des résistances réglables ou des potentiomètres (P1, P2).
  11. Dispositif selon l'une des revendications 8 à 10,
    caractérisé en ce que,
    à côté de la ligne de points de chauffage (TZ), est disposé un détecteur de bande colorée (2) dont le signal de détection est conduit à un dispositif de commande (ST) qui exécute, chaque fois, un programme de commande conformément au procédé selon l'une des revendications 1 à 7, quand aucune bande colorée n'est détectée par le détecteur de bande colorée (2).
  12. Dispositif selon la revendication 8,
    caractérisé en ce que
    les éléments d'enregistrement d'écriture (RS1 à RSN) sont connectés ensemble en tant que registre d'écriture et sont alimentés chacun par un dispositif de commande externe, pour chaque ligne, lors de chaque sortie de ligne, par l'intermédiaire d'une liaison de transfert de données (DÜ), avec une information d'impression (DI).
EP99104836A 1998-03-17 1999-03-11 Procédé et appareil d'impression sur papier thermosensitif Expired - Lifetime EP0943443B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19811539 1998-03-17
DE19811539A DE19811539A1 (de) 1998-03-17 1998-03-17 Verfahren und Vorrichtung zum Bedrucken von Thermochromic-Schichten

Publications (3)

Publication Number Publication Date
EP0943443A2 EP0943443A2 (fr) 1999-09-22
EP0943443A3 EP0943443A3 (fr) 2000-04-05
EP0943443B1 true EP0943443B1 (fr) 2005-03-02

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ID=7861188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99104836A Expired - Lifetime EP0943443B1 (fr) 1998-03-17 1999-03-11 Procédé et appareil d'impression sur papier thermosensitif

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EP (1) EP0943443B1 (fr)
DE (2) DE19811539A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61286170A (ja) * 1985-06-14 1986-12-16 Oki Electric Ind Co Ltd サ−マルヘツド駆動回路
EP0273738B1 (fr) * 1986-12-27 1993-03-17 Canon Kabushiki Kaisha Imprimante ayant la fonction de correction
JP3017828B2 (ja) * 1991-03-29 2000-03-13 株式会社東芝 記録装置
US5552364A (en) * 1992-03-09 1996-09-03 Ricoh Company, Ltd. Reversible theromosensitive coloring recording method, recording medium and recording apparatus for the recording method
US5371522A (en) * 1992-03-18 1994-12-06 Ricoh Company, Ltd. Apparatus for erasing and recording data in a thermosensitive recording medium
JPH0890934A (ja) * 1994-09-22 1996-04-09 Almex Inc 熱可逆特性を有するリライトカードの印字方法と印字装置
JPH09174892A (ja) * 1995-12-28 1997-07-08 Oki Electric Ind Co Ltd 記録媒体処理装置
JP3674824B2 (ja) * 1997-12-27 2005-07-27 株式会社リコー 印字・消去方法

Also Published As

Publication number Publication date
DE59911671D1 (de) 2005-04-07
DE19811539A1 (de) 1999-09-23
EP0943443A2 (fr) 1999-09-22
EP0943443A3 (fr) 2000-04-05

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