EP0193912B1 - Holding device for a thermal print head - Google Patents

Holding device for a thermal print head Download PDF

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Publication number
EP0193912B1
EP0193912B1 EP86102743A EP86102743A EP0193912B1 EP 0193912 B1 EP0193912 B1 EP 0193912B1 EP 86102743 A EP86102743 A EP 86102743A EP 86102743 A EP86102743 A EP 86102743A EP 0193912 B1 EP0193912 B1 EP 0193912B1
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EP
European Patent Office
Prior art keywords
mounting plate
thermal
spring
spindle
mounting
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
EP86102743A
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German (de)
French (fr)
Other versions
EP0193912A1 (en
Inventor
Hermann Dipl.-Ing. Moll (Fh)
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.)
GE Medical Systems Information Technologies GmbH
Original Assignee
Hellige 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 Hellige GmbH filed Critical Hellige GmbH
Publication of EP0193912A1 publication Critical patent/EP0193912A1/en
Application granted granted Critical
Publication of EP0193912B1 publication Critical patent/EP0193912B1/en
Expired 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/312—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print pressure adjustment mechanisms, e.g. pressure-on-the paper mechanisms

Definitions

  • the invention relates to a holder according to the preamble of claim 1 for supporting and guiding a thermal print head in the drive of a thermal printer and / or thermal register.
  • thermal head In the case of thermal printers or registrars of the type mentioned (for example US Pat. No. 4,235,555), the thermal print head (hereinafter “thermal head”) is guided on an axis in the drive of the printer (registrar) in such a way that the thermal printing elements or heating points arranged in a row next to one another press against the paper web, which is supported on its back by a rubber-coated transport roller, which also acts as a counter-pressure roller. In order to obtain a clean typeface, the heating points must be pressed evenly against the paper with a certain pressure.
  • the thermal head must therefore be adjusted very precisely during production, but also after every cleaning or renewal. If these requirements are not met, the result is an uneven typeface or the trace of a written curve is mapped unevenly.
  • the invention is therefore based on the object of improving thermal printers (thermal registers) in such a way that a consistently uniform typeface is achieved with as little manufacturing and assembly effort as possible.
  • the solution according to the invention consists in a holder for supporting and guiding a thermal print head in the drive of a thermal printer or registrar in accordance with the type mentioned at the outset in realizing the characterizing features of patent claim 1.
  • the idea of the invention is that the mounting of the thermal print head relative to the drive is not rigid, but rather flexible due to a slightly movable bearing, but in such a way that when a pressure force is applied over the entire length of the heating point row, a uniform pressure against the paper web is achieved.
  • the thermal head 6 in the form of a ceramic plate equipped with heating points (not shown) and corresponding control logic is glued to the support points labeled "x" with a heat-resistant adhesive on a holding plate 3 made of glass fiber reinforced thermoplastic material, with stops 3d serving for precise alignment, which are parallel to groove-like guides 13 with stop surfaces 3b, 3c are made in lateral webs 9 of the holding plate 3.
  • the thermal head 6 is pressed in the area of its heating points against a paper web 8 in the manner of its heating points, which is guided and supported on the rear side by a rubber-coated transport roller 7, which can also be referred to as a counter-pressure roller.
  • the transport roller 7 is driven by a motor, not shown.
  • the heating points 11 of the thermal head 6 are arranged in close proximity to one another.
  • the heating points 11 must be pressed uniformly against the paper web 8 with a certain force.
  • the holding plate 3 rests in the direction of attack against the paper web 8 in only one point of contact of a knob-like projection 3a in the middle between the two groove-like guides 13 on the axle 4 mounted in the frame of the drive (not shown in more detail). That is, the groove base of the guides 13 does not normally touch the axis 4.
  • the holding plate 3 is therefore supported on the one hand in the vertical direction of the illustration only in the area of the stop surfaces 3b, 3c of the guides 13 and in the horizontal or adjustment direction only at the point of contact of the projection 3a.
  • the pressing force and its uniform distribution on the thermal head 6 held by single-point support, so to speak, "floating" over the holding plate 3 is achieved by a leaf spring 2, which in the area between the point-like support of the holding plate 3 by the projection 3a and the stops 3d on the Thermal head 6 facing away from the outside of the holding plate is clamped on one side and at its free (distal) end either lies against the frame of the drive or - if the pressing force is to be adjustable - its pressing force can be adjusted by means of a screw 1 anchored in the frame.
  • the angular range marked by two beams 14, 15 starting from the point of contact on the projection 3a approximately defines the effective range of the contact force by the leaf spring 2.
  • the transport roller 7 and the axis 4 must be made lying parallel, which is achieved, for example, in that the same frame board is used in the manufacture. Given the usual manufacturing tolerances for such writing mechanisms, it is no longer necessary to adjust the parallelism of the thermal head 6 and the transport roller 7.
  • a connector 5 is designated, which can also serve as a transport lock and is removed when the holding plate with thermal head 6 is to be removed upwards. This is simple z. B. advantageous for occasional cleaning. A readjustment at It is no longer necessary to change the thermal head.
  • Reference note 12 indicates the encapsulated integrated circuits of the control logic. 16 with a multi-core ribbon cable is called, via which the power supply and the control signals for the control logic takes place.
  • thermal heads can be arranged next to one another, each individual thermal head automatically aligning itself with the transport roller 7. If - as shown in the drawings - the holding plate 3 is narrower than the thermal head 6, several thermal heads can be arranged without a gap. This enables a curve to be written across several thermal combs with one thermal register.

Description

Die Erfindung betrifft eine Halterung gemäß dem Oberbegriff des Patentanspruchs 1 zur Abstützung und Führung eines Thermodruckkopfs im Laufwerk eines Thermodruckers und/oder Thermoregistrierers.The invention relates to a holder according to the preamble of claim 1 for supporting and guiding a thermal print head in the drive of a thermal printer and / or thermal register.

Bei Thermodruckern oder -registrierern der genannten Art (z.B. US-A 4 235 555) wird der Thermodruckkopf (im folgenden "Thermokopf") auf einer Achse im Laufwerk des Druckers (Registrierers) so geführt, daß die in einer Reihe nebeneinander angeordneten Thermodruckelemente oder Heizpunkte gegen die Papierbahn drücken, die auf ihrer Rückseite durch eine gummibeschichtete, gleichzeitig als Gegendruckwalze wirkende Transportwalze abgestützt ist. Um ein sauberes Schriftbild zu erhalten, müssen die Heizpunkte mit einer bestimmten Andruckkraft gleichmäßig gegen das Papier gedrückt werden. Dies setzt eine über die Länge der Heizpunktreihe sehr gleichmäßige Andruckkraft einerseits und eine sehr genaue achsparallele Ausrichtung der Lagerachse der Halterung des Thermokopfs und der Welle der Transportwalze andererseits sowie eine sehr genaue Zuführung der Papierbahn voraus. Der Thermokopf muß also bei der Fertigung, aber auch nach jeder Reinigung oder Erneuerung, sehr genau justiert werden. Sind diese Voraussetzungen nicht erfüllt, so ergibt sich ein ungleichmäßiges Schriftbild bzw. die Spur eines geschriebenen Kurvenzugs wird ungleichmäßig scharf abgebildet.In the case of thermal printers or registrars of the type mentioned (for example US Pat. No. 4,235,555), the thermal print head (hereinafter "thermal head") is guided on an axis in the drive of the printer (registrar) in such a way that the thermal printing elements or heating points arranged in a row next to one another press against the paper web, which is supported on its back by a rubber-coated transport roller, which also acts as a counter-pressure roller. In order to obtain a clean typeface, the heating points must be pressed evenly against the paper with a certain pressure. This presupposes a very uniform pressure force over the length of the heating point row on the one hand and a very precise axis-parallel alignment of the bearing axis of the holder of the thermal head and the shaft of the transport roller on the other hand as well as a very precise feeding of the paper web. The thermal head must therefore be adjusted very precisely during production, but also after every cleaning or renewal. If these requirements are not met, the result is an uneven typeface or the trace of a written curve is mapped unevenly.

Der Erfindung liegt damit die Aufgabe zugrunde, Thermodrucker (Thermoregistrierer) so zu verbessern, daß bei möglichst geringem Fertigungs- und Montageaufwand ein stets gleichmäßiges Schriftbild erzielt wird.The invention is therefore based on the object of improving thermal printers (thermal registers) in such a way that a consistently uniform typeface is achieved with as little manufacturing and assembly effort as possible.

Die erfindungsgemäße Lösung besteht bei einer Halterung zur Abstützung und Führung eines Thermodruckkopfs im Laufwerk eines Thermodruckers oder -registrierers gemäß der eingangs genannten Art in der Verwirklichung der kennzeichnenden Merkmale des Patentanspruchs 1.The solution according to the invention consists in a holder for supporting and guiding a thermal print head in the drive of a thermal printer or registrar in accordance with the type mentioned at the outset in realizing the characterizing features of patent claim 1.

Vorteilhafte Weiterbildungen des Erfindungsgedankens sind in Unteransprüchen angegeben.Advantageous developments of the inventive concept are specified in the subclaims.

Der Erfindungsgedanke geht dahin, die Halterung des Thermodruckkopfs relativ zum Laufwerk nicht starr, sondern durch eine in sich geringfügig bewegliche Lagerung flexibel anzulegen, jedoch so, daß bei Aufbringen einer Andruckkraft über die gesamte Länge der Heizpunktreihe ein gleichmäßiger Andruck gegen die Papierbahn erzielt wird.The idea of the invention is that the mounting of the thermal print head relative to the drive is not rigid, but rather flexible due to a slightly movable bearing, but in such a way that when a pressure force is applied over the entire length of the heating point row, a uniform pressure against the paper web is achieved.

Die Erfindung und vorteilhafte Einzelheiten werden nachfolgend unter Bezug auf die Zeichnung in einer beispielsweisen Ausführungsform näher erläutert. Es zeigen:

  • Fig. 1a die Seitenansicht auf eine Thermokopfhalterung mit erfindungsgemäßen Merkmalen, gesehen von der Seite der Transportwalze, und
  • Fig. 1b die Teilschnitt-Seitenansicht der Thermokopfhalterung gemäß Fig. 1a.
The invention and advantageous details are explained in more detail below with reference to the drawing in an exemplary embodiment. Show it:
  • Fig. 1a shows the side view of a thermal head holder with features according to the invention, seen from the side of the transport roller, and
  • 1b shows the partial sectional side view of the thermal head holder according to FIG. 1a.

Der Thermokopf 6 in Form einer mit nicht näher dargestellten Heizpunkten und entsprechender Ansteuerlogik bestückten Keramikplatte ist mit einem hitzebeständigen Kleber an den mit "x" bezeichneten Auflagepunkten auf eine Halteplatte 3 aus glasfaserverstärktem thermoplastischem Kunststoff aufgeklebt, wobei zur positionsgenauen Ausrichtung Anschläge 3d dienen, die parallel zu nutartigen Führungen 13 mit Anschlagflächen 3b, 3c in seitlichen Stegen 9 der Halteplatte 3 hergestellt sind. Der Thermokopf 6 wird über die Halterung 3 in nachfolgend noch näher zu beschreibender Weise im Bereich seiner Heizpunkte gegen eine Papierbahn 8 gedrückt, die rückseitig durch eine gummibeschichtete Transportwalze 7 geführt und abgestützt wird, die auch als Gegendruckwalze bezeichnet werden kann. Die Transportwalze 7 wird durch einen nicht dargestellten Motor angetrieben. Sie bildet also das Gegenlager für die einzelnen, in Reihe dicht nebeneinander angeordneten Heizpunkte 11 des Thermokopfs 6. Um ein sauberes Schriftbild zu erhalten, müssen die Heizpunkte 11 mit einer bestimmten Kraft gleichmäßig gegen die Papierbahn 8 gedrückt werden. Dies wird erfindungsgemäß dadurch erreicht, daß die Halteplatte 3 in Anstellrichtung gegen die Papierbahn 8 in nur einem Auflagepunkt eines noppenartig vorspringenden Ansatzes 3a in der Mitte zwischen den beiden nutartigen Führungen 13 auf der im nicht näher gezeigten Gestell des Laufwerks gelagerten Achse 4 aufliegt. Das heißt, der Nutgrund der Führungen 13 berührt die Achse 4 im Normalfall nicht. Die Halteplatte 3 ist also einerseits in Vertikalrichtung der Darstellung nur im Bereich der Anschlagflächen 3b, 3c der Führungen 13 und in Horizontal- oder Anstellrichtung nur am Auflagepunkt des Ansatzes 3a abgestützt. Die Andruckkraft und deren glechmäßige Verteilung auf den durch einpunktförmige Abstützung sozusagen "schwimmend" über die Halteplatte 3 gehaltenen Thermokopf 6 wird durch eine Blattfeder 2 erreicht, die im Bereich zwischen der punktartigen Abstützung der Halteplatte 3 durch den Ansatz 3a und den Anschlägen 3d an der dem Thermokopf 6 abgekehrten Außenseite der Halteplatte einseitig eingespannt ist und an ihrem freien (distalen) Ende entweder am Gestell des Laufwerks anliegt oder - wenn die Andruckkraft einstellbar sein soll - mittels einer im Gestell verankerten Schraube 1 in ihrer Andruckkraft eingestellt werden kann. Der durch zwei vom Auflagepunkt am Ansatz 3a ausgehende Strahlen 14, 15 markierte Winkeibereich legt in etwa den Wirkbereich der Anstellkraft durch die Blattfeder 2 fest.The thermal head 6 in the form of a ceramic plate equipped with heating points (not shown) and corresponding control logic is glued to the support points labeled "x" with a heat-resistant adhesive on a holding plate 3 made of glass fiber reinforced thermoplastic material, with stops 3d serving for precise alignment, which are parallel to groove-like guides 13 with stop surfaces 3b, 3c are made in lateral webs 9 of the holding plate 3. The thermal head 6 is pressed in the area of its heating points against a paper web 8 in the manner of its heating points, which is guided and supported on the rear side by a rubber-coated transport roller 7, which can also be referred to as a counter-pressure roller. The transport roller 7 is driven by a motor, not shown. It therefore forms the counter-bearing for the individual heating points 11 of the thermal head 6 arranged in close proximity to one another. In order to obtain a clean typeface, the heating points 11 must be pressed uniformly against the paper web 8 with a certain force. This is achieved according to the invention in that the holding plate 3 rests in the direction of attack against the paper web 8 in only one point of contact of a knob-like projection 3a in the middle between the two groove-like guides 13 on the axle 4 mounted in the frame of the drive (not shown in more detail). That is, the groove base of the guides 13 does not normally touch the axis 4. The holding plate 3 is therefore supported on the one hand in the vertical direction of the illustration only in the area of the stop surfaces 3b, 3c of the guides 13 and in the horizontal or adjustment direction only at the point of contact of the projection 3a. The pressing force and its uniform distribution on the thermal head 6 held by single-point support, so to speak, "floating" over the holding plate 3 is achieved by a leaf spring 2, which in the area between the point-like support of the holding plate 3 by the projection 3a and the stops 3d on the Thermal head 6 facing away from the outside of the holding plate is clamped on one side and at its free (distal) end either lies against the frame of the drive or - if the pressing force is to be adjustable - its pressing force can be adjusted by means of a screw 1 anchored in the frame. The angular range marked by two beams 14, 15 starting from the point of contact on the projection 3a approximately defines the effective range of the contact force by the leaf spring 2.

Die Transportwalze 7 und die Achse 4 müssen parallel liegend gefertigt sein, was beispielsweise dadurch erreicht wird, daß bei der Fertigung die gleiche Gestellplatine verwendet wird. Unter der Voraussetzung üblicher Fertigungstoleranzen für derartige Schreibwerke ist eine Justage der Parallelität von Thermokopf 6 und Transportwalze 7 nicht mehr erforderlich.The transport roller 7 and the axis 4 must be made lying parallel, which is achieved, for example, in that the same frame board is used in the manufacture. Given the usual manufacturing tolerances for such writing mechanisms, it is no longer necessary to adjust the parallelism of the thermal head 6 and the transport roller 7.

Mit Bezugshinweis 5 ist ein Anschlußstecker 5 bezeichnet, der auch als Transportsicherung dienen kann und abgezogen wird, wenn die Halteplatte mit Thermokopf 6 nach oben entnommen werden soll. Dies ist auf einfache Weise z. B. beim gelegentlichen Reinigen vorteilhaft. Ein Nachjustieren beim Wechsel des Thermokopfs ist nicht mehr erforderlich. Bezugshinweis 12 deutet auf die verkapselten integrierten Schaltkreise der Ansteuerlogik hin. Mit 16 ist ein vieladriges Flachbandkabel bezeichnet, über das die Stromversorgung und die Zuführung der Steuersignale für die Ansteuerlogik erfolgt.With reference 5, a connector 5 is designated, which can also serve as a transport lock and is removed when the holding plate with thermal head 6 is to be removed upwards. This is simple z. B. advantageous for occasional cleaning. A readjustment at It is no longer necessary to change the thermal head. Reference note 12 indicates the encapsulated integrated circuits of the control logic. 16 with a multi-core ribbon cable is called, via which the power supply and the control signals for the control logic takes place.

Ein weiterer Vorteil ergibt sich daraus, daß mehrere Thermoköpfe nebeneinander angeordnet werden können, wobei sich jeder einzelne Thermokopf selbsttätig nach der Transportwalze 7 ausrichtet. Ist - wie in den Zeichnungen dargestellt - die Halteplatte 3 schmäler als der Thermokopf 6, so können mehrere Thermoköpfe ohne Zwischenraum angeordnet werden. Dadurch läßt sich eine Kurve über mehrere Thermokämme mit einem Thermoregistrierer lückenlos schreiben.Another advantage results from the fact that a plurality of thermal heads can be arranged next to one another, each individual thermal head automatically aligning itself with the transport roller 7. If - as shown in the drawings - the holding plate 3 is narrower than the thermal head 6, several thermal heads can be arranged without a gap. This enables a curve to be written across several thermal combs with one thermal register.

Claims (4)

1. A mounting for the support and guidance of the thermal print head (6) in the running gear of a thermal printer and/or thermal logger, the thermal print elements of which, arranged in a row next to one another, are set with slight contact pressure against a paper web (8), which is supported by a transport cylinder (7) driven on the underside, via a mounting plate (3) borne with swivel movement on a spindle (4) supported in the frame of the running gear, wherein - the mounting plate (3) has at either of two end-position webs (9) running perpendicular to the spindle (4) a stop face (3b, 3c) supporting the spindle (4) and, lying centrally therebetween, a protuberance (3a), projecting from the inside surface of the mounting plate (3) opposite the thermal print head (6) and directed toward the spindle (4), which protuberance forms a punctiform support for the mounting plate (3) on the spindle (4), and wherein - in the region between the protuberance (3a) and the row of thermal print elements (11) a contact pressure spring (2) is fixed on the mounting plate (3) facing away from the thermal head (6), the other end of which spring is supported in the frame of the running gear.
2. A mounting as claimed in claim 1, wherein the spring is a leaf spring (2) which is clamped at one end (at 26) on the outside of the mounting plate (3) and the spring pressure force of which on the mounting plate (3) is adjustable by means of a set screw (1) borne in the frame and acting on the distal end (2a) of said spring.
3. A mounting as claimed in one of the preceding claims, wherein the thermal head (6) is rigidly connected, in particular by bonding, to the mounting plate (3).
4. A mounting as claimed in one of the preceding claims, wherein the mounting plate (3) is narrower than the width dimension of the thermal print head (6).
EP86102743A 1985-03-05 1986-03-03 Holding device for a thermal print head Expired EP0193912B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853507782 DE3507782A1 (en) 1985-03-05 1985-03-05 BRACKET FOR A THERMAL PRINT HEAD
DE3507782 1985-03-05

Publications (2)

Publication Number Publication Date
EP0193912A1 EP0193912A1 (en) 1986-09-10
EP0193912B1 true EP0193912B1 (en) 1989-02-01

Family

ID=6264271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102743A Expired EP0193912B1 (en) 1985-03-05 1986-03-03 Holding device for a thermal print head

Country Status (3)

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EP (1) EP0193912B1 (en)
JP (1) JPS61273972A (en)
DE (2) DE3507782A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4710040A (en) * 1985-12-02 1987-12-01 Ncr Corporation Printer having constant pressure between print head and platen
JPH0167044U (en) * 1987-07-06 1989-04-28
DE3909286A1 (en) * 1989-03-21 1990-09-27 Esselte Meto Int Gmbh THERMAL PRINT HEAD
JPH0673980B2 (en) * 1989-04-24 1994-09-21 株式会社精工舎 Recording head support device
DE3943239A1 (en) * 1989-12-22 1991-06-27 Siemens Ag Thermo transfer printing device - has pressure roller providing constant force in direction of printing elements
EP0521174B1 (en) * 1991-06-20 1997-03-05 Scheidt & Bachmann Gmbh Thermal printer
JPH08337029A (en) * 1995-06-13 1996-12-24 Seiko Instr Inc Line thermal printer
JP3177126B2 (en) * 1995-06-16 2001-06-18 アルプス電気株式会社 Thermal printer
DE19527610A1 (en) * 1995-07-28 1997-01-30 Esselte Meto Int Gmbh Printer mechanism with variable printing force - uses intermediate plate selectively inserted between spring plate and lever

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106731A (en) * 1973-02-12 1974-10-09
IT1118078B (en) * 1977-05-04 1986-02-24 Olivetti & Co Spa IMPACT IMPROVEMENTS ON A PRINTER
JPS589756U (en) * 1981-07-15 1983-01-21 株式会社サト− Thermal head support mechanism

Also Published As

Publication number Publication date
JPS61273972A (en) 1986-12-04
DE3507782A1 (en) 1986-09-11
DE3661992D1 (en) 1989-03-09
EP0193912A1 (en) 1986-09-10

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