EP0388683A2 - Tête d'imprimante thermique - Google Patents

Tête d'imprimante thermique Download PDF

Info

Publication number
EP0388683A2
EP0388683A2 EP90104072A EP90104072A EP0388683A2 EP 0388683 A2 EP0388683 A2 EP 0388683A2 EP 90104072 A EP90104072 A EP 90104072A EP 90104072 A EP90104072 A EP 90104072A EP 0388683 A2 EP0388683 A2 EP 0388683A2
Authority
EP
European Patent Office
Prior art keywords
axis
line
heating elements
actuator
housing
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.)
Granted
Application number
EP90104072A
Other languages
German (de)
English (en)
Other versions
EP0388683B1 (fr
EP0388683A3 (en
Inventor
Ulf Koch
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.)
Meto International GmbH
Original Assignee
Esselte Meto International GmbH
Esselte Meto International Produktions 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 Esselte Meto International GmbH, Esselte Meto International Produktions GmbH filed Critical Esselte Meto International GmbH
Publication of EP0388683A2 publication Critical patent/EP0388683A2/fr
Publication of EP0388683A3 publication Critical patent/EP0388683A3/de
Application granted granted Critical
Publication of EP0388683B1 publication Critical patent/EP0388683B1/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
    • 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
    • B41J25/316—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with tilting motion mechanisms relative to paper surface

Definitions

  • the invention relates to a thermal printhead with a housing in which a support carrying a thermal printing plate is pivotally mounted about an axis mounted at its two ends, the thermal printing plate having a plurality of selectively controllable heating elements arranged next to one another in line, one in the housing an axis rotatably mounted counter-pressure roller with which the line of the heating elements of the thermal printing plate is held non-positively in contact along an axis-parallel surface line, the bearing axis of the support running parallel to the axis of the counter-pressure roller and at a distance from this axis.
  • Such a thermal print head is known from DE-OS 36 16 925.
  • a heat-sensitive paper is passed between the platen and the thermal printing board, the contact with the paper being exactly on the line of the heating elements the thermal printing board comes about.
  • electrical control signals are applied to the heating elements in synchronization with the feed movement of the paper, which heat the heating elements and thereby cause the desired discoloration of the heat-sensitive paper.
  • the invention has for its object to provide a thermal printhead of the type specified, with the help of which a uniform print image can be achieved without the production tolerances of the components used for the storage of the thermal printing plate in the housing having to meet particularly high requirements.
  • this object is achieved in that one end of the axis of the support is adjustably mounted in the housing perpendicular to the plane formed by the axis and the line of the heating elements.
  • the bearing axis of the thermal print board is at one end in a bearing opening held, which can be adjusted in a direction in which there is a direct effect on the parallelism of the axis of the counter-pressure roller and the bearing axis. Because of this possibility of influencing, a uniform print image can be set by simply adjusting the bearing located at one end of the bearing axis.
  • the bearing axis and the corresponding bearing openings can therefore be manufactured without having to adhere to tight manufacturing tolerances.
  • the thermal print head 10 shown in FIGS. 1 and 2 has a housing that contains two side plates 12 and 14.
  • the side plates 12, 14 are connected to one another by an end plate 16.
  • a mounting plate 18 is fastened to the end plate, by means of which the thermal print head can be fastened in a printing device, not shown.
  • An axle 20 mounted with its ends in the two side plates 12, 14 carries a counter-pressure roller 22 which can be driven by a motor, not shown, so that it rotates clockwise in the illustration of FIG. 1 when a heat-sensitive paper to be printed is printed is to be transported along the path 24 indicated by dashed lines.
  • a thermal printing board 26 is pivotally mounted by means of an axis 28 extending between the two side plates 12 and 14.
  • a spring 30 which is attached on the one hand to the thermal printing plate 26 and on the other hand to a pin 32 seated firmly in the side plate 12, the thermal printing plate is held non-positively in contact with the counter-pressure roller 22.
  • the thermal printing board 26 contains, on a ceramic substrate 34, a plurality of heating elements arranged along a line 36 that can be seen in FIG. 2. Integrated circuits (not shown) are also attached to the ceramic substrate 34 and are used to control the heating elements. Printed connecting lines lead on the ceramic substrate to a connecting plug 38, to which a socket, not shown, located at the end of a cable can be connected. Via this cable, the data printing signals are fed to the thermal printing board 34, which lead to the printing of the desired information on the heat-sensitive paper transported along the path 24.
  • the ceramic substrate 34 is attached to a heat sink 40, which is used to dissipate excess heat.
  • a support 42 which, adjacent to the side plates 12 and 14, has tabs 44 and 46 running parallel to these side plates. Bearing openings are provided in these tabs 44, 46, through which the bearing axis 28 of the thermal printing plate 26 extends.
  • the openings in the tabs 44, 46 run axially in line with associated openings in the side plates 12, 14, so that the bearing axis 28 each through an opening in a tab 44, 46 and through an associated opening runs in the side plates 12, 14.
  • the thermal printing board 26 can be Applying a pulling force directed to the left in FIG. 1 on the upper end of the thermal printing plate 26 can be pivoted counterclockwise so that the area between the line 36 of the heating elements and the counter-pressure roller 22 is freely accessible. This free accessibility is desirable in order to be able to clean the thermal printing board 26 and the counter-pressure roller 22 in this area.
  • adjusting screws 50, 52 are mounted in an end flange 48 of the support 42, which screws are screwed into associated adjusting blocks 54, 56. Between these adjusting blocks and the flange 48, the shafts of the associated adjusting screw 50, 52 surrounding compression springs 58, 60 are inserted. From Fig. 1 it can be seen that the adjusting block 54 is provided with a pin 62 which engages through an elongated hole 64 in the plate 42 in an opening 66 in the heat sink 40.
  • the setting block 56 is also formed and has a pin which engages through an elongated hole in the sheet metal 36 into an opening in the heat sink 40.
  • the heat sink 40 with the ceramic substrate 34 attached to it can be moved parallel to the support 42. It can thus be achieved that the line 36 of the heating elements coincides exactly with the line of contact between the thermal printing plate 26 and the counter-pressure roller 22. This is a prerequisite for achieving a perfect print image.
  • the end of the axis 28 on the right in FIG. 2 is guided outwards through an elongated hole 68 in the side plate 12 into a bearing opening 70 of a plate-shaped actuator 72.
  • the bearing opening 70 is also designed as an elongated hole, which, however, runs perpendicular to the longitudinal extension of the elongated hole 68 with regard to its longitudinal extent.
  • the actuator 72 is provided with an integrally molded, pin-like projection 74 which engages in an opening 76 in the side plate 12. The actuator 72 can be pivoted parallel to the side plate 12 by rotating around the projection 74.
  • a locking screw 78 is provided, which is screwed into a corresponding threaded hole in the side plate 12.
  • the shaft of the locking screw 78 passes through an elongated hole 80 in the side plate 12; this elongated hole extends along an arc around the center of the projection 74.
  • a scale 82 is attached to the upper end of the actuator 72 and is assigned a corresponding mark 84 on the side plate 12.
  • the actuator 72 can be pivoted with the projection 74 as a fulcrum.
  • the axis 28 is displaced, the direction of displacement being approximately perpendicular to the plane formed by the line 36 of the heating elements and the axis 28.
  • the parallelism of the line 36 of the heating elements and the axis of the counter-pressure roller 22 can be influenced by this adjustment of the axis 28.
  • This parallelism must be present in order to achieve by means of the spring 30 a uniform contact pressure between the heating elements and the counter-pressure roller over the entire length of the line 36 of the heating elements. A uniform print image across the entire width of the paper to be printed can only be produced with even contact pressure on all heating elements.
  • the setting of parallelism by adjusting the position member 72 can be checked during the execution of a printing operation in which it is observed whether heating elements at both ends of line 36 produce the same blackening on the heat-sensitive paper. If the same blackening is present, the locking screw 80 is tightened so that the actuator 72 is locked in the position reached.
  • the elongated hole 70 for receiving the axis 28 in the actuator 72 is only necessary if the elongated hole 68 in the side plate 12 runs straight and not along an arc around the pin 74. If the elongated hole 68 is designed in a straight line, a radial displacement of the axis 28 must be permitted when the actuator 72 is adjusted, which is made possible by means of the elongated hole 70. In the exemplary embodiment described, the straightforward design of the elongated hole 68 has been chosen for reasons of simpler manufacture.
  • a straightforward design of the elongated hole 68 ensures that when the contact pressure of the heating elements is set by means of the actuator 72, the line 36 of these elements also continues to coincide with the line of contact between the thermal printing plate 26 and the counterpressure roller 22.
  • a non-rectilinear design of the elongated hole 68 would cause the line 36 to be rotated relative to the axis 20 of the counter-pressure roller 22, which would require readjusting the thermal printing plate 26 by means of the adjusting screws 50 and 52.
  • axle 28 in a round hole in the actuator 72; in this case, a round opening would be provided instead of the elongated hole 68 in the side plate 12, the diameter of which is selected so that when the actuator 72 ⁇ m is pivoted, the projection 74 does not come into contact between the bearing axis 28 and the side plate 12.

Landscapes

  • Electronic Switches (AREA)
  • Magnetic Heads (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Common Mechanisms (AREA)
EP90104072A 1989-03-21 1990-03-02 Tête d'imprimante thermique Expired - Lifetime EP0388683B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909254A DE3909254A1 (de) 1989-03-21 1989-03-21 Thermodruckkopf
DE3909254 1989-03-21

Publications (3)

Publication Number Publication Date
EP0388683A2 true EP0388683A2 (fr) 1990-09-26
EP0388683A3 EP0388683A3 (en) 1990-12-27
EP0388683B1 EP0388683B1 (fr) 1994-07-06

Family

ID=6376864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104072A Expired - Lifetime EP0388683B1 (fr) 1989-03-21 1990-03-02 Tête d'imprimante thermique

Country Status (8)

Country Link
US (1) US5023628A (fr)
EP (1) EP0388683B1 (fr)
JP (1) JPH07106664B2 (fr)
AT (1) ATE108140T1 (fr)
AU (1) AU618172B2 (fr)
CA (1) CA2011915C (fr)
DE (2) DE3909254A1 (fr)
ES (1) ES2055191T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227460B (en) * 1989-01-11 1993-10-06 Monarch Marking Systems Inc Printing apparatus
FR2698585A1 (fr) * 1992-12-01 1994-06-03 Intermec Corp Procédé et appareil de réglage d'une tête d'impression.
EP0645255A3 (fr) * 1993-09-24 1995-12-13 Esselte Meto Int Gmbh Méthode et appareil pour le montage d'un élément d'impression thermique.
EP0670785A4 (fr) * 1992-10-02 1996-07-17 Vincent C Adams Imprimante thermique.
EP0742104A3 (fr) * 1991-05-24 1997-09-17 Mitsubishi Electric Corp Appareil d'impression
US5921687A (en) * 1991-05-24 1999-07-13 Mitsubishi Denki Kabushiki Kaisha Printing apparatus

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3365559B2 (ja) * 1990-08-10 2003-01-14 株式会社サトー サーマルプリンタにおけるヘッド支持機構
JP3077257B2 (ja) * 1991-06-21 2000-08-14 ソニー株式会社 プリンタ
US5208610A (en) * 1991-07-31 1993-05-04 Hewlett-Packard Company Pen carriage for an ink-jet printer
GB2282568B (en) * 1993-09-22 1998-04-22 Asahi Optical Co Ltd Thermal line printer
JP3116157B2 (ja) * 1993-12-27 2000-12-11 セイコーインスツルメンツ株式会社 ラインプリンタ
KR0152471B1 (ko) * 1995-08-28 1998-10-15 김광호 팩시밀리의 감열기록헤드 가압 장치
DE69710634D1 (de) * 1996-05-09 2002-04-04 Agfa Gevaert Nv Thermische Druckeinrichtung mit Druckkopfeinstellung
DE19720671A1 (de) * 1996-05-29 1997-12-04 Eastman Kodak Co Verstellbare Druckkopfhalterung für Vorlagenabbildungsgerät
JP4977552B2 (ja) * 2007-08-20 2012-07-18 リンテック株式会社 プリンタヘッドの印圧調整装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023662A (en) * 1974-12-19 1977-05-17 Ing. C. Olivetti & C., S.P.A. Arrangement for adjusting the spacing between a print head and a platen
US4063630A (en) * 1976-06-25 1977-12-20 International Business Machines Corporation Typewriter impact position adjustment mechanism
US4178106A (en) * 1977-11-25 1979-12-11 General Electric Company Print gap adjust mechanism for printers
JPS5662180A (en) * 1979-10-26 1981-05-27 Canon Inc Recording device
DE3038867C2 (de) * 1980-10-15 1983-12-01 F & O Electronic Systems GmbH & Co, 6901 Neckarsteinach Ausdruck- und Justiervorrichtung für den Druckkopf eines Thermodruckers
DE3226730A1 (de) * 1981-07-17 1983-02-03 International Standard Electric Corp., 10022 New York, N.Y. Seriendrucker mit einer justiervorrichtung
JPS60104347A (ja) * 1983-11-10 1985-06-08 Matsushita Electric Ind Co Ltd 記録装置
JPS60192671A (ja) * 1984-03-14 1985-10-01 Matsushita Graphic Commun Syst Inc 記録ヘツド取付装置
JPS6120335U (ja) * 1984-07-11 1986-02-05 松下電器産業株式会社 印字装置
DD251253A3 (de) * 1985-10-04 1987-11-11 Robotron Bueromasch Vorrichtung zum an- und abschwenken eines thermodruckkopfes von der druckwalze
JPS62139657U (fr) * 1986-02-28 1987-09-03
JPS63173654A (ja) * 1987-01-14 1988-07-18 Fuji Xerox Co Ltd 感熱転写記録装置
JPS644646U (fr) * 1987-06-30 1989-01-12
ATE83439T1 (de) * 1987-09-23 1993-01-15 Mannesmann Ag Bueromaschine, insbesondere matrixdrucker, mit druckkopf/schreibwiderlager-abstandsjustage.
US4750880A (en) * 1987-11-09 1988-06-14 Eastman Kodak Company Compliant print head loading mechanism for thermal printers
US4957379A (en) * 1989-01-11 1990-09-18 Monarch Marking Systems, Inc. Printing apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227460B (en) * 1989-01-11 1993-10-06 Monarch Marking Systems Inc Printing apparatus
EP0742104A3 (fr) * 1991-05-24 1997-09-17 Mitsubishi Electric Corp Appareil d'impression
US5921687A (en) * 1991-05-24 1999-07-13 Mitsubishi Denki Kabushiki Kaisha Printing apparatus
EP0670785A4 (fr) * 1992-10-02 1996-07-17 Vincent C Adams Imprimante thermique.
US5872585A (en) * 1992-10-02 1999-02-16 Zebra Technologies Corporation Media sensor for a thermal demand printer
US5874980A (en) * 1992-10-02 1999-02-23 Zebra Technologies Corporation Thermal demand printer
FR2698585A1 (fr) * 1992-12-01 1994-06-03 Intermec Corp Procédé et appareil de réglage d'une tête d'impression.
EP0645255A3 (fr) * 1993-09-24 1995-12-13 Esselte Meto Int Gmbh Méthode et appareil pour le montage d'un élément d'impression thermique.

Also Published As

Publication number Publication date
ES2055191T3 (es) 1994-08-16
CA2011915A1 (fr) 1990-09-21
US5023628A (en) 1991-06-11
ATE108140T1 (de) 1994-07-15
EP0388683B1 (fr) 1994-07-06
CA2011915C (fr) 1996-04-02
DE59006333D1 (de) 1994-08-11
EP0388683A3 (en) 1990-12-27
JPH07106664B2 (ja) 1995-11-15
AU618172B2 (en) 1991-12-12
AU5079390A (en) 1990-09-27
DE3909254A1 (de) 1990-09-27
JPH02279368A (ja) 1990-11-15

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