EP0301512B1 - Agencement d'impression à transmission de chaleur - Google Patents

Agencement d'impression à transmission de chaleur Download PDF

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Publication number
EP0301512B1
EP0301512B1 EP88112151A EP88112151A EP0301512B1 EP 0301512 B1 EP0301512 B1 EP 0301512B1 EP 88112151 A EP88112151 A EP 88112151A EP 88112151 A EP88112151 A EP 88112151A EP 0301512 B1 EP0301512 B1 EP 0301512B1
Authority
EP
European Patent Office
Prior art keywords
heating
thermo
transfer printer
ink ribbon
printer according
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
EP88112151A
Other languages
German (de)
English (en)
Other versions
EP0301512A2 (fr
EP0301512A3 (en
Inventor
Rolf Roeschlein
Alfons Bräutigam
Heinz Schulte
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.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf International 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 Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Publication of EP0301512A2 publication Critical patent/EP0301512A2/fr
Publication of EP0301512A3 publication Critical patent/EP0301512A3/de
Application granted granted Critical
Publication of EP0301512B1 publication Critical patent/EP0301512B1/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
    • B41J2/325—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
    • B41J17/00—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
    • B41J17/38—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper for dealing with the impression-transfer material after use

Definitions

  • the invention relates to a thermal transfer printing device according to the preamble of claim 1.
  • Thermal transfer printers use a film as a ribbon, which is coated on one side with a colored wax.
  • the thermal head melts wax in the form of the character to be printed and transfers it to the recording medium, usually paper, by pressure. Since the ink ribbon can only be used once, the written text can be easily read from the ink ribbon due to the characters melted out of the ink layer. In many cases this is undesirable.
  • the above-described disadvantage is to be eliminated in a thermal transfer printing device of the type mentioned at the outset, as is known from JP 61-20785A, by the heating device provided therein.
  • This consists of a rod-shaped heating element which axially penetrates the hollow shaft of the winding roll.
  • the heating element is intended to heat the heating coil so that the dye layer melts.
  • this makes the writing illegible.
  • the ribbon windings stick together, so that the dye layers are destroyed when the ribbon is unwound from the winding roller.
  • the disadvantage of this embodiment is that the heating device becomes sluggish with increasing winding thickness. In order to melt the outer dye layer with a larger winding thickness, a considerable heating power is required.
  • the printing device is switched off immediately after the last printing process, it may happen that the dye layer of the last ribbon section that has run onto the take-up roll does not was melted enough to make the characters in the dye layer illegible.
  • the inner layers of the ribbon roll are continuously heated to a comparatively high level, so that the dye or the thermoplastic material containing it evaporates and is deposited on cooler parts of the printing device.
  • the invention has for its object to provide a thermal transfer printing device of the type mentioned with a heating device that makes it possible in a simple, inexpensive and reliable manner, the characters on the ink ribbon used immediately after printing with little energy and without the risk of contamination of the Make the printing device unrecognizable.
  • the wax layer of the ink ribbon is only melted in the solution according to the invention when the ribbon has already been wound up. Since the dye layer of the emerging ribbon section points towards the winding core, it cannot be read when it emerges.
  • the heating device only has to supply the energy required to melt the dye layer of the ribbon section lying directly on the heating strip. Due to the pressure of the heating bar and the capillary action between the windings, the wax flows completely. Outgassing of the volatile constituents of the wax forming the dye layer is not to be feared if the dye layer is heated only briefly, so that there is an unpleasant smell and / or contamination the pressure device is not to be feared due to the wax vapor depositing in cold places of the device.
  • the heating strip is shorter than the ribbon wrap and is arranged approximately centrally between its ends. As a result, an area is formed at both ends of the ribbon roll in which the wax is not melted and thus the escape of liquid wax is prevented.
  • the heating bar is mounted such that it rests on the ribbon roll under the effect of gravity.
  • spring elements or the like can be omitted in order to press the heating strip against the ribbon wrap.
  • the heating strip can rest directly on the ribbon roll or be kept at a constant distance from the outermost winding of the ribbon roll by spacing elements.
  • the heating strip is expediently mounted on the housing cover. As a result, the heating bar is automatically lifted off the ribbon wrap when, for example, the ribbon is to be replaced.
  • a very simple, adjustable mounting of the heating strip is included if it is pivotably mounted about an axis parallel to the roller axis. With a suitable one Distance of the swivel axis from the roller axis, the heating bar can follow the increase in the winding diameter without its function being impaired.
  • the heating strip is flexible or comprises a plurality of heating elements which are arranged next to one another in the longitudinal direction of the strip and are movable relative to one another.
  • the heating strip has at least one heating plate facing the take-up roll and made, for example, of aluminum and at least one heat storage plate made, for example, of steel, between which a heating conductor is enclosed. Thanks to its high thermal conductivity, the heating plate ensures even heat distribution.
  • the steel plate acts as a pressure weight and, on the other hand, it is a heat accumulator and heat buffer. It has the task of ensuring an even heat emission, even if the transport of the wax sequence is not uniform. Otherwise, the heating output would always have to be adapted to the transport speed of the ribbon. This would require a correspondingly large and powerful power supply in the device. Furthermore Such a heat accumulator offers the possibility of operating the heating in a clocked manner so as not to overload the power supply too much.
  • the heating strip expediently has a temperature sensor which is connected to a regulating device for regulating the heating current, so as to keep the temperature of the heating strip at a constant value.
  • the heating conductor and optionally the temperature sensor are embedded in a film which is fastened with a section projecting between the heating plate and the heat storage plate to a carrier rail directed parallel to the winding roll. If individual heating elements are arranged next to one another, the film at the same time enables the mobility of the individual heating elements without the need for mechanical joints.
  • the temperature sensor in this foil print can be formed by a conductor track which consists of a material with a strongly temperature-dependent conductivity.
  • the thermal transfer printing device shown in FIG. 1 comprises a housing, generally designated 10, with a lower housing part 12 and a housing cover 14 which is articulated on the lower housing part 12 about a pivot axis 16 located on the rear side of the housing.
  • Shafts 18 are arranged in the housing cover 14 for feeding the recording media, that is to say, for example, sheets of paper. Beneath the paper chutes 18 there is a guide surface 20 for feeding a recording medium 22 to a printing roller 24, which the recording medium 22 partially wraps around in the area of the printing point and from which it is guided out of the device in a manner not shown.
  • thermal head 26 which extends essentially over the entire length of the pressure roller 24 and is pivotably mounted about a pivot axis 28 parallel to the latter. It can be adjusted by means of a crank drive 30, 32, 34, 36 between a pressure position in which it rests on the pressure roller 24 and a pressure-free position in which it is at a distance from the pressure roller 24.
  • an ink ribbon 38 in the form of a film coated on one side with a colored wax layer is guided from a supply roll 40 to a take-up roll 42 parallel to the recording medium 22.
  • This can be driven, while the supply roll 40 can be braked with a friction brake in order to prevent overrun when the printing process is interrupted.
  • the ribbon is inserted so that the dye or Wax layer to the pressure roller 24 indicates.
  • the ink ribbon 38 is guided over the deflection roller 44 to the take-up roller 42 in such a way that the dye layer points to the core of the take-up roller 42 during the winding, that is to say is on the inside.
  • the thermal transfer printing device described so far is known for example from DE-OS 35 10 260.
  • a heating strip generally designated 46, is used, which is now described in more detail below with reference to FIGS. 2 and 3.
  • the heating strip 46 comprises a carrier rail 48 which is pivotably mounted on the housing cover 14 about an axis 50 parallel to the axis of the winding roller 42.
  • a heating foil 54 shown in FIG. 3 is clamped on the carrier rail 48 with the aid of a counter plate 52.
  • the heating foil 54 consists of a so-called foil print, i.e. two thin insulating foils, between which a heating coil in the form of a printed conductor 56 is enclosed. This film has a total thickness of approx. 50 ⁇ m, so that it is flexible.
  • the heating film 54 has four rectangular sections 60 which are arranged next to one another and are separated from one another by a few millimeters wide cuts 58 and which are connected to one another along one of their rectangular sides by a continuous film section 62 with which the Heating film 54 is attached to the support rail 48.
  • a connection section 64 is also provided at one end of the continuous section 62.
  • the individual sections 60 of the heating foil 54 are meandered through by the heating conductor 56, as can be seen in FIGS. 2 and 3.
  • Each individual section 60 is enclosed between an aluminum plate 66 intended for bearing on the ribbon roll of the take-up roll 42 and a steel plate 68 which are screwed together by screws 70.
  • the size of the plates 66 and 68 is chosen so that a free film section 72 remains between them and the carrier rail 48, which due to its elasticity the mobility of the heating element 74 formed by a film section 60, the plates 66 and 68 relative to the carrier rail 48 and allowed to neighboring heating elements 74. This ensures that the heating elements 74 lie flat on the surface of the ribbon roll, even if the diameter of the ribbon roll is not constant over the length of the winding roll. It goes without saying that more than the four individual heating elements shown could also be provided.
  • the heating foil 54 contains a temperature measuring conductor 76 which runs parallel to the heating conductor 56 and which consists of a material with a strongly temperature-dependent conductivity.
  • This measuring conductor 76 is connected to a temperature control unit 78, which then controls the heating current or the heating voltage so that an at least approximately constant temperature of the heating strip is reached, which is above the melting point of the wax layer, but does not damage the carrier film of the ribbon.
  • the heating strip 46 lies against its circumference solely due to the force of gravity, regardless of the diameter of the winding roller 42, the individual heating elements 74 nestling against their circumferential surface over the entire length of the winding roller 42 due to their mobility.
  • the wax layer of the outermost ribbon bearings is melted and, due to the pressure exerted by the heating elements 74 and due to the capillary action between the adjacent ribbon windings, runs in such a way that the characters become unrecognizable and the ribbon windings stick together.
  • the heating bar 46 is shorter than the take-up roller 42, there remains an edge region of the ribbon roll in which the wax does not melt. This non-melting area seals the ribbon roll at the axial ends to prevent liquid wax from escaping at the roll ends.
  • the heating elements shown by solid lines in Figure 2 lie directly on the peripheral surface of the take-up reel 42, i.e. the ribbon wrap so that the heat is transferred by conduction. However, it may also be advantageous to keep the heating elements 74 at a constant distance from the ribbon wrap, so that the heat is transmitted primarily by thermal radiation. This distance can be maintained by strip-shaped or rib-shaped spacing elements 80 which are arranged on the underside of the heating elements 74 and are shown in broken lines in FIG.
  • heating strip is rigid, it is also sufficient to provide an arm 82 (FIG. 2) indicated by a broken line on the heating strip, which slides with its head 84 on the ribbon wrap and in this case holds the heating elements arranged rigidly at a distance from the ribbon wrap.
  • the heating strip could also be mounted in lateral guides in such a way that it can be adjusted parallel to itself and perpendicular to the axis of the winding roller, the pressing of the heating strip also being able to take place by spring force.
  • a major advantage of the device according to the invention is that the characters are made unrecognizable in the device without fear of contamination of the device.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Electronic Switches (AREA)

Claims (11)

  1. Dispositif d'impression par transfert thermique, comprenant une enveloppe (10), un dispositif (20, 24) de transport d'un support d'impression plan (22), un dispositif (40, 42) de transport d'un ruban encreur (38) supportant un colorant activable par voie thermique, guidé sur une partie de son chemin de transport parallèlement au support d'impression (22) et pouvant être serré contre ce dernier, ledit dispositif de transport (40, 42) comprenant un support d'un rouleau (40) de réserve de ruban encreur et d'un rouleau commandé (42) d'enroulement avec lequel un dispositif de chauffage est combiné de manière que les couches de colorant du rouleau de ruban encreur fondent, ledit dispositif d'impression comprenant également une tête thermique (26) disposée approximativement sur la largeur du ruban encreur (38), caractérisé en ce que le ruban encreur (38) arrive sur le rouleau d'enroulement (42) de manière que les couches de colorant soient situées intérieurement et en ce que le dispositif de chauffage prévu est une baguette chauffante (46) qui est parallèle au rouleau d'enroulement et se prolonge approximativement sur la longueur de ce dernier et qui est montée mobile perpendiculairement à l'axe du rouleau et placée sous contrainte contre la surface circonférentielle du rouleau de ruban encreur.
  2. Dispositif d'impression par transfert thermique selon la revendication 1, caractérisé en ce que la baguette chauffante (46) est montée de manière qu'elle prenne appui par gravité sur le rouleau de ruban encreur.
  3. Dispositif d'impression par transfert thermique selon la revendication 1, caractérisé en ce que la baguette chauffante (46) est maintenue à une distance constante du rouleau du ruban encreur au moyen d'éléments d'entretoisement (80).
  4. Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 3, caractérisé en ce que la baguette chauffante (46) est montée sur le couvercle (14) de l'enveloppe.
  5. Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 4, caractérisé en ce que la baguette chauffante (46) est montée oscillante autour d'un axe (50) parallèle à l'axe du rouleau.
  6. Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 5, caractérisé en ce que la baguette chauffante (46) est plus courte que le rouleau de ruban encreur et disposée approximativement au milieu entre les extrémités de ce dernier.
  7. Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 6, caractérisé en ce que la baguette chauffante (46) comprend plusieurs éléments chauffants (74) qui sont juxtaposés dans la direction de la longueur de la baguette et qui sont mobiles les uns par rapport aux autres.
  8. Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 7, caractérisé en ce que la baguette chauffante (46) comprend au moins une plaque chauffante (46) tournée vers le rouleau d'enroulement (42) et au moins une plaque (68) d'accumulation de chaleur, un conducteur chauffant (56) étant renfermé entre ces plaques.
  9. Dispositif d'impression par transfert thermique selon la revendication 8, caractérisé en ce que le conducteur chauffant (56) est noyé dans une feuille (54) dont un morceau (62) ressortant entre la plaque chauffante (66) et la plaque (68) d'accumulation de chaleur est fixé à une barre de support (48) orientée parallèlement au rouleau d'enroulement (42).
  10. Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 9, caractérisé en ce que la baguette chauffante (46) comprend un capteur de température (76) qui est connecté à un dispositif (78) de réglage du courant de chauffage.
  11. Dispositif d'impression par transfert thermique selon la revendication 10, caractérisé en ce que le capteur de température (76) est formé d'une piste de conducteur de mesure noyée dans la feuille (54) et qui est en un matériau dont la conductivité est dépendante de la température.
EP88112151A 1987-07-27 1988-07-27 Agencement d'impression à transmission de chaleur Expired - Lifetime EP0301512B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3724827A DE3724827C1 (de) 1987-07-27 1987-07-27 Thermotransferdruckeinrichtung
DE3724827 1987-07-27

Publications (3)

Publication Number Publication Date
EP0301512A2 EP0301512A2 (fr) 1989-02-01
EP0301512A3 EP0301512A3 (en) 1990-02-07
EP0301512B1 true EP0301512B1 (fr) 1992-01-22

Family

ID=6332443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112151A Expired - Lifetime EP0301512B1 (fr) 1987-07-27 1988-07-27 Agencement d'impression à transmission de chaleur

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EP (1) EP0301512B1 (fr)
DE (2) DE3724827C1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19549376A1 (de) * 1995-03-07 1996-09-26 Francotyp Postalia Gmbh Anordnung zur Ermittlung einer Farbbandrestmenge für Thermotransferdruckverfahren
DE102010002558A1 (de) 2009-11-20 2011-06-01 Symrise Ag Verwendung physiologischer Kühlwirkstoffe und Mittel enthaltend solche Wirkstoffe
WO2013041621A1 (fr) 2011-09-20 2013-03-28 Basf Se Modulateurs à faible masse moléculaire du récepteur sensible au froid et au menthol trpm8, et leur utilisation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3217416A1 (de) * 1982-05-08 1983-11-10 Olympia Werke Ag, 2940 Wilhelmshaven Farbbandkassette fuer eine schreib- oder aehnliche bueromaschine
DE3421406C1 (de) * 1984-06-08 1985-11-28 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Farbbandkassette fuer Schreib- oder aehnliche Maschinen
JPH06120785A (ja) * 1992-10-02 1994-04-28 Kokusai Electric Co Ltd パルス遅延回路

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 10, nr. 171 (M-489) (2227), 17 Juni 1986; JP - A - 61 020 785 (FUJI XEROX K.K.) 29.01.1986 *
PATENT ABSTRACTS OF JAPAN, Band 11, nr. 120 (M-580) (2567), 15 April 1987; JP - A - 61 261 086 (SHARP CORP.) 19.11.1986 *
PATENT ABSTRACTS OF JAPAN, Band 9, nr. 316 (M-438) (2039), 12 Dezember 1985; JP - A - 60 151 089 (TOKYO DENKI K.K.) 08.08.1985 *

Also Published As

Publication number Publication date
DE3867950D1 (de) 1992-03-05
EP0301512A2 (fr) 1989-02-01
DE3724827C1 (de) 1989-01-26
EP0301512A3 (en) 1990-02-07

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