EP0388684B1 - Thermodruckkopf - Google Patents

Thermodruckkopf Download PDF

Info

Publication number
EP0388684B1
EP0388684B1 EP90104073A EP90104073A EP0388684B1 EP 0388684 B1 EP0388684 B1 EP 0388684B1 EP 90104073 A EP90104073 A EP 90104073A EP 90104073 A EP90104073 A EP 90104073A EP 0388684 B1 EP0388684 B1 EP 0388684B1
Authority
EP
European Patent Office
Prior art keywords
thermal printing
printing plate
line
heating elements
plate
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
EP90104073A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0388684A2 (de
EP0388684A3 (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 EP0388684A2 publication Critical patent/EP0388684A2/de
Publication of EP0388684A3 publication Critical patent/EP0388684A3/de
Application granted granted Critical
Publication of EP0388684B1 publication Critical patent/EP0388684B1/de
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
    • B41J25/34—Bodily-changeable print heads or carriages

Definitions

  • the invention relates to a thermal print head with a holding frame, a thermal printing plate which has a plurality of individually controllable heating elements arranged along a line on a front side, and a counter-pressure roller rotatably mounted in the holding frame, against which the thermal printing plate is held in a force-fitting manner in such a way that the line of the heating elements touches the circumferential surface of the counterpressure roller along an axially parallel surface line, at least one latching hook, which engages with a pin fastened to the holding frame, being attached to the thermal printing plate at a location which is at a distance from the line of the heating elements, and in the region between the at least one latching hook and the line of heating elements, at least one compression spring is attached between a stop firmly connected to the holding frame and the back of the thermal printing board facing away from the front of the thermal printing board.
  • Such a thermal print head is known from JP-A-63 134 274.
  • the thermal print circuit board sits on a holding arm, which in turn is connected to a holding frame which is articulated in the printer.
  • This connection is designed so that the holding arm with the thermal printing plate can be removed from the holding frame.
  • the entire printhead is thus made up of two parts, and only one of the two parts can be removed from the printer. Since, as stated, the holding frame is articulated to the printer, it cannot be easily removed from the printer. This has the disadvantage that repairs to the holding frame, for example adjustment processes which are necessary after prolonged use, have to be carried out in the printer itself and cannot be carried out on a freely accessible holding frame.
  • the invention has for its object to provide a thermal printhead of the type described, which allows a very easy removal of the thermal printing plate due to its structure and in which a constant and above all constant pressing force of the thermal printhead on the medium to be printed is achieved.
  • this object is achieved in the thermal print head described above in that the at least one compression spring is assigned a holding device which holds the compression spring on the thermal printing plate, that the holding device is formed by a plate which extends on at least one pin perpendicular to the rear of the thermal printing plate is displaceable by a predetermined path and the end of the compression spring facing away from the rear of the thermal printing plate comprises that the stop is held in engagement with the plate forming the holding device and that the predetermined distance is greater than the distance of the stop from the rear of the thermal printing plate.
  • the thermal print head 10 shown in a top view in FIG. 1 and in section in FIG. 2 has a holding frame which contains two side plates 12 and 14.
  • the side plates 12 and 14 are connected to one another by a plurality of axes 16, 18, 20, 22.
  • an axis 24 is rotatably supported in the two side plates, which carries a counter-pressure roller 26.
  • a thermal printing plate 28 is attached in the holding frame, which carries a larger number of heating elements along a line 30 near its end on the left in FIG. 2 on a ceramic substrate.
  • Integrated circuits (not shown) are also attached to the ceramic substrate and are used to control the heating elements.
  • Printed connecting lines lead from the integrated circuits on the one hand to the heating elements and on the other hand to a connecting plug 32 which can be seen in FIG. 1 at the right end of the thermal printing board 28 and to which a socket, not shown, is located at the end of a cable can be connected.
  • a heat sink 34 contained in the thermoplate 28 is used to dissipate excess heat.
  • a sheet metal 36 is fastened on the heat sink 34 and is provided with a latching hook 38, 40 in the region of the side plates 12, 14.
  • the latching hook 38 engages from above via an axis 42 which extends between the side plates 12 and 14. In the same way, the latching hook 40 also engages over this axis 42.
  • FIG. 3 From the sheet 36, two pins 44, 46 can be seen in FIG. 3, on which a holding device is slidably mounted, which has two plates 50, 52 connected by a web 48. Between the plates 50 and 52 and the sheet 36 there is a compression spring 54 and 56, respectively.
  • the springs 54 and 56 press the holding device with the web 48 and the plates 50, 52 as far away from the sheet metal 36 as two snap rings 58 and 60 attached to the pins 44, 46 allow.
  • stops 62 and 64 are attached, which reach over the plates 50, 52 according to FIG. 1 and are in engagement with the upper sides of these plates.
  • the distance between the sheet 36 and the stops 62, 64 is dimensioned such that it is smaller than the distance that the holding device with the web 48 and the plates 50, 52 cover until the web 48 is placed against the securing rings 58, 60 can.
  • the compression springs 54, 56 Due to the arrangement of the compression springs 54, 56 in the area between the axis 42 and the line of contact between the thermal printing board 28 and the counter-pressure roller 26, the compression springs 54, 56 not only generate the force with which the thermal printing plate is held in contact with the counter-pressure roller 26, but they also generate a locking force between the locking hooks 38, 40 and the axis 42, which is easy to release the thermal printing board 28 prevented from the axis 42.
  • the generation of this transverse force on the axis 42 is important because when the thermal print head is operated on the thermal print plate 28, a tensile force directed to the left in FIG. 2 is exerted, which releases the latching hooks 38, 40 from the axis 42 without generating the transverse force this axis 42 could result.
  • the aforementioned tensile force comes about as follows:
  • the dash-dotted line 66 shown in FIG. 2 indicates the path of the heat-sensitive paper to be printed through the thermal print head 10.
  • the counter-pressure roller 26 is rotated counterclockwise by means of a drive device (not shown) acting on the axis 24.
  • the paper is carried along by friction along the line 30 of the heating elements of the thermal printing board 28 by moving forward in the direction of the arrow shown in FIG. 2, so that the desired data due to the selective heating of the paper and the resulting blackening by appropriate electrical control of the individual heating elements can be generated.
  • the locking hooks 38, 40 do not necessarily have to cooperate with an axis extending between the two side plates 12 and 14; it is also easily possible to have one on each side plate inwards To attach protruding pin that the locking hooks 38, 40 could overlap as shown in Fig. 2.
  • the provision of the axle 42 contributes to further stiffening and thus to increasing the stability of the holding frame.
  • a guide plate 68 which is fastened to the side plates 12 and 14, serves for the clean feeding of the recording medium.
  • FIG. 4 shows the basic arrangement of the thermal printing plate 28 relative to the counter-pressure roller 26 and to the axis 42.
  • the compressive forces generated by the compression springs 54, 56 are indicated by arrows.
  • the open design of the latching hooks 38, 40 and the provision of the holding device for the compression springs 54, 56 makes it possible to pull the thermal printing plate 28 out of the holding frame without further notice.
  • the thermal printing plate 28 is provided with an extendable handle element 70 which has two elongated holes 72, 74, so that it can be shifted to the left in the illustration of FIGS. 1 and 2. This enables a better grip on the grip element 70 if the thermal printing board 28 is to be pulled out of the holding frame.
  • I'm pulled out Condition can be easily cleaned the thermal printing board, and a possibly necessary cleaning of the back pressure roller can be carried out. If the paper is jammed in the holding frame, it can be easily grasped with the thermal printing plate pulled out and brought back into the correct position.
  • the thermal printing plate 28 can easily be pushed back into the holding frame since these angled ends act like chamfers.
  • the thermal print head described is very easy to use and maintain due to the fact that the thermal print board can be removed; in particular, the area in which the actual printing process takes place and in which soiling is caused by abrasion can be cleaned well.

Landscapes

  • Electronic Switches (AREA)
  • Common Mechanisms (AREA)
EP90104073A 1989-03-21 1990-03-02 Thermodruckkopf Expired - Lifetime EP0388684B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909286A DE3909286A1 (de) 1989-03-21 1989-03-21 Thermodruckkopf
DE3909286 1989-03-21

Publications (3)

Publication Number Publication Date
EP0388684A2 EP0388684A2 (de) 1990-09-26
EP0388684A3 EP0388684A3 (en) 1990-12-27
EP0388684B1 true EP0388684B1 (de) 1994-01-26

Family

ID=6376874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104073A Expired - Lifetime EP0388684B1 (de) 1989-03-21 1990-03-02 Thermodruckkopf

Country Status (3)

Country Link
US (1) US5055858A (enrdf_load_stackoverflow)
EP (1) EP0388684B1 (enrdf_load_stackoverflow)
DE (2) DE3909286A1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335002A (en) * 1991-09-30 1994-08-02 Rohm Co., Ltd. Printing head and printer incorporating the same
DE4139891C2 (de) * 1991-12-04 1996-05-09 Esselte Meto Int Gmbh Halterungsanordnung für einen Thermodruckkopf
DE4219798A1 (de) * 1992-06-17 1993-12-23 Esselte Meto Int Gmbh Thermodruckkopfhalterung
US5440328A (en) * 1992-10-05 1995-08-08 Atlantek, Inc. Single-pass multi-color thermal printer
GB2282568B (en) * 1993-09-22 1998-04-22 Asahi Optical Co Ltd Thermal line printer
DE4332576A1 (de) * 1993-09-24 1995-03-30 Esselte Meto Int Gmbh Thermodruckkopfhalterung
US5631690A (en) * 1994-02-03 1997-05-20 Seikosha Precision Inc. Recording apparatus
US5541635A (en) * 1994-03-18 1996-07-30 Mettler-Toledo, Inc. Printer mechanism
KR0152471B1 (ko) * 1995-08-28 1998-10-15 김광호 팩시밀리의 감열기록헤드 가압 장치
JP3309038B2 (ja) * 1995-09-29 2002-07-29 アンリツ株式会社 サーマルヘッド保持構造
DE19720671A1 (de) * 1996-05-29 1997-12-04 Eastman Kodak Co Verstellbare Druckkopfhalterung für Vorlagenabbildungsgerät
US6095701A (en) * 1997-12-23 2000-08-01 Datacard Corporation Adjustable print head mounting mechanism
FR2837423B1 (fr) * 2002-03-21 2004-06-18 A P S Engineering Mecanisme d'impression thermique, notamment applicable aux terminaux de paiement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630880A (en) * 1979-08-24 1981-03-28 Hitachi Ltd Positioning mechanism for heat-sensitive recorder
JPS61190431A (ja) * 1985-02-13 1986-08-25 株式会社　サト− 卓上型サ−マルプリンタ−
DE3507782A1 (de) * 1985-03-05 1986-09-11 Hellige Gmbh, 7800 Freiburg Halterung fuer einen thermodruckkopf
DE3609789A1 (de) * 1986-03-22 1987-10-01 Espera Werke Gmbh Thermodrucker fuer auf einen traegerstreifen abloesbar angebrachte etiketten und fuer streifenmaterial
JPS63134274A (ja) * 1986-11-26 1988-06-06 Tokyo Electric Co Ltd サ−マルヘツド支持装置
DE3735361A1 (de) * 1987-10-19 1989-05-03 Standard Elektrik Lorenz Ag Thermodrucker

Also Published As

Publication number Publication date
US5055858A (en) 1991-10-08
DE3909286C2 (enrdf_load_stackoverflow) 1991-09-12
DE3909286A1 (de) 1990-09-27
EP0388684A2 (de) 1990-09-26
EP0388684A3 (en) 1990-12-27
DE59004376D1 (de) 1994-03-10

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