EP0340855A2 - Imprimante thermique - Google Patents

Imprimante thermique Download PDF

Info

Publication number
EP0340855A2
EP0340855A2 EP89201090A EP89201090A EP0340855A2 EP 0340855 A2 EP0340855 A2 EP 0340855A2 EP 89201090 A EP89201090 A EP 89201090A EP 89201090 A EP89201090 A EP 89201090A EP 0340855 A2 EP0340855 A2 EP 0340855A2
Authority
EP
European Patent Office
Prior art keywords
writing
strip
thermal
support part
line direction
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
EP89201090A
Other languages
German (de)
English (en)
Other versions
EP0340855A3 (en
EP0340855B1 (fr
Inventor
Gerhard Habelt
Franz Mucha
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0340855A2 publication Critical patent/EP0340855A2/fr
Publication of EP0340855A3 publication Critical patent/EP0340855A3/de
Application granted granted Critical
Publication of EP0340855B1 publication Critical patent/EP0340855B1/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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/02—Platens
    • B41J11/08—Bar or like line-size platens

Definitions

  • the invention relates to a thermal printer with a thermal print head which is adjustable in the line direction and a writing bar which runs in the row direction and is opposite the thermal printing head and can be pivoted transversely to the line direction as a counter bearing for the thermal printing head, the writing bar being made of elastic material with one of its main surfaces forming the counter bearing has existing support part.
  • the writing strip is therefore designed to be pivotable transversely to the direction of the line, so that it can adapt to the position of the thermal printhead in order to form a perfect counter bearing for the thermal printhead.
  • the writing strip consists of a metal strip, on the one main surface of which a counter-bearing, made of elastic material and also strip-shaped support part is fastened, the two parts together having an essentially T-shaped cross-sectional profile.
  • a T-shaped groove running in the row direction is provided on the printer side, into which the writing bar can be inserted, with the interposition of a rubber strip, the support part, which is made of elastic material and which forms the counter bearing, then consists of this T- shaped groove protrudes.
  • a projecting rib extending in the row direction is provided centrally on the bottom surface of the T-shaped groove, on which the writing bar rests with the rubber strip being interposed.
  • the projecting rib forms a pivot bearing for the writing bar so that it can be pivoted transversely to the line direction.
  • the invention has set itself the goal of a thermo Train printer of the type mentioned in such a way that a particularly simple structure of the writing bar, a safe and simple pivoting of the writing bar transverse to the direction of the line, and a simple assembly of the writing bar on the thermal printer is achieved.
  • the support part of the writing bar to have at least one strip-shaped hinge part projecting centrally from the main surface forming its counter-bearing, which extends at least in sections in the row direction and resiliently resiliently transversely to the row direction, with a strip-shaped strip running parallel to the support part , part held on the printer side is connected.
  • the hinge part connecting the support part to the mounting part forms a pivot axis about which the support part can be pivoted transversely to the line direction, as a result of which it can be easily and securely adjusted to the thermal print head.
  • no separate measures are therefore required to form a pivot axis for the writing bar on the printer side for pivoting it transversely to the line direction, since the support part of the writing bar can be pivoted simply and securely due to its hinge part which resiliently transversely to the line direction.
  • the printer-side assembly of the writing strip is particularly simple, since only its assembly part has to be held on the printer side, for which there are a number of possibilities within the framework of the known prior art, such as gluing or clamping.
  • the writing strip with its support part, hinge part and mounting part is designed as a one-piece part in plastic technology, the hinge part being effective in the manner of a film hinge.
  • the writing bar can be easily produced in a single operation, again no special complex measures are required for its pivotability transversely to the line direction and its assembly on the printer side.
  • the hinge part of the writing strip is formed by a leaf spring which, on the one hand, with the support part and, on the other hand is connected to the mounting part of the writing bar.
  • This also results in a simple structure of the writing strip, it being possible, for example when the support part and the mounting part are formed as plastic parts, to be injection-molded onto the leaf spring in one operation.
  • the support part and the mounting part are formed as plastic parts, to be injection-molded onto the leaf spring in one operation.
  • no special complex measures are necessary for the pivoting of the writing bar transversely to the line direction and its assembly on the printer side.
  • Fig. 1 shows an oblique view of the structure of a thermal printer with a writing bar running in the direction of the line, along which a thermal print head is adjustable.
  • Fig. 2 shows a section transverse to the line direction of a section of the thermal printer according to Fig. 1 around the area of the writing bar, the first embodiment showing a writing bar consisting of a support part, hinge part and mounting part, the hinge part is designed in the manner of a film hinge .
  • 3 shows the writing bar provided in the exemplary embodiment according to FIG. 2 on its own on an enlarged scale.
  • 4 shows a second exemplary embodiment of a writing strip in the representation of FIG. 3, in which a leaf spring is provided as the hinge part.
  • FIG. 1 denotes the chassis of a thermal printer which has a carriage 3 which can be displaced along a rod 2 arranged on the chassis.
  • This carriage 3 can be adjusted in the line direction indicated by the double arrow 4 by means of a drive, not shown here, for example a cable pull or a toothed belt.
  • a carrier 5 is displaceable along the rod 2, on which a thermal print head is arranged, which is opposite a writing bar 6, which also runs in the line direction and is arranged on the printer 1 on the chassis 1, so that it does not appear in the representation of FIG is visible.
  • the carrier 5 and with it the thermo printhead pivotable from a starting position at a distance from the writing bar 6 towards the writing bar 6 into a working position for the thermal printhead, in which the writing bar 6 forms an abutment for the thermal printhead with the interposition of a recording medium and an ink ribbon.
  • a record carrier such as a sheet of paper
  • Such a record carrier can be inserted into an inlet slot 7 of the thermal printer, wherein it is gripped by a transport device and driven to be drawn into the thermal printer or to feed lines, and then again from an outlet slot 8 provided in the area of the writing bar 6 emerges from the thermal printer and then runs between the writing strip 6 and the carrier 5 or the thermal print head.
  • a ribbon cassette 9 can also be placed on the carriage 3, which is provided in the usual way with a cutout 10 into which the carrier 5 with the thermal print head can dip in order to engage behind a ribbon 11 accommodated in the ribbon cassette 9.
  • a rotatable winding mandrel 12 is provided on the carriage 3, which engages in the ink ribbon cassette 9 and can drive a winding core there for winding the ink ribbon 11.
  • Such a drive for the ink ribbon 11 is derived, for example, from the adjustment movement of the slide 3, wherein a gear 13 provided on the slide 3 engages in a rack 14 arranged on the chassis 1 of the thermal printer and rolls along the same during the adjustment of the slide 3 and thus rolls Rotary movement on a drive device not shown here transfers to the winding mandrel 12.
  • the recording medium and the ink ribbon are thus between the writing strip 6 and the carrier 5 for the thermal printing head, the ink ribbon being adjacent to the thermal printing head and the recording medium 6 of the writing strip. If characters are to be printed on the recording medium with the thermal printhead, the thermal printhead is pivoted by means of the carrier 5 in the direction of the writing bar 6, the writing bar 6 being a counterbearing for the thermal printhead, forms the ribbon and the recording medium.
  • the thermal print head fits snugly on the ink ribbon and this in turn fits snugly on the recording medium, which is ensured by the fact that the writing strip 6 can adapt to the position of the thermal print head, for which purpose it can be pivoted in a known manner across the line direction is arranged on the thermal printer.
  • FIG. 2 shows an exemplary embodiment of such a writing bar 6 pivotably arranged on the thermal printer, the thermal printing head arranged on the carrier 5 and designated by 15 also being visible in the illustration of FIG. Furthermore, FIG. 2 also shows an embodiment for a transport device for a record carrier, which here consists of a drivable drive roller 16 which interacts with two counter pressure rollers 17 and 18, with a record carrier inserted into the inlet slot 7 between the drive roller 16 and the counter pressure rollers 17 and 18 is pulled in until it then exits the outlet slot 8 and continues in the area between the writing bar 6 and the thermal print head 15.
  • a transport device for a record carrier here consists of a drivable drive roller 16 which interacts with two counter pressure rollers 17 and 18, with a record carrier inserted into the inlet slot 7 between the drive roller 16 and the counter pressure rollers 17 and 18 is pulled in until it then exits the outlet slot 8 and continues in the area between the writing bar 6 and the thermal print head 15.
  • the writing strip 6, which is also shown on its own in an enlarged scale in FIG. 3, is formed by a support part 19 which is connected to a mounting part 21 via a hinge part 20.
  • the strip-shaped hinge part 20 which extends in the row direction protrudes centrally from the surface 23 of the support part 19 which is opposite the main surface 22 which forms the counter bearing for the thermal print head 15 and is in turn connected to the mounting part 21, which itself is formed in the form of strips and parallel to the support part 19 runs.
  • the support part 19, the hinge part 20 and the mounting part 21 are formed as a one-piece part, which is manufactured in plastic technology, whereby the support part 19 can also be given the elasticity required to form the counter bearing for the thermal print head 15.
  • the hinge part 20 which is designed to be resilient transversely to the line direction, is effective in the manner of a film hinge, as a result of which the support part 19 ge is pivotable relative to the mounting part 21 transversely to the longitudinal extent of the same extending in the row direction.
  • the mounting part 21 With the mounting part 21, the writing strip 6 is fastened to the chassis 1 on the printer side, for which purpose, for example, the chassis 1 can have a groove-shaped recess 24, on the bottom surface of which the mounting part 21 is glued, for example, the support part 19, opposite the thermal print head 15, made of the groove-shaped Well 24 protrudes.
  • the structure of such a writing strip 6 is particularly simple, since it is designed as a one-piece part, no additional measures being necessary for a pivotable arrangement of its support part 19, since this results directly from the hinge part 20, which is resilient transversely to the line direction becomes.
  • the provision of such a hinge part 20 ensures that the support part 19 of the writing bar 6 can be pivoted correctly and securely transversely to the line direction, so that the support part 19 can adapt well to the respective position of the thermal print head, which is very important for good print quality.
  • the printer-side assembly of the writing strip 6 is also particularly simple, since it is only necessary to secure its mounting part 21.
  • the mounting part 21 there are of course various possibilities in addition to the above-mentioned gluing within the framework of the prior art known for this purpose, for example the mounting part 21 could also be clamped, screwed, welded or fastened in some other way.
  • this hinge part 20 can preferably extend over the entire length of the writing strip 6.
  • the hinge part 20 or the mounting part 21 of the writing bar 6 the writing material is different for itself bar 6 can also be made in one piece in a multi-stage injection molding process.
  • the writing strip 6 again consists of a support part 19 and a mounting part 21, which are connected to one another by a hinge part which is resilient transversely to the line direction, but which is here formed by a strip-shaped leaf spring 25 running in the line direction, as a result of which the support part 19 is again pivotable with respect to the mounting part 21 transversely to the longitudinal extent of the same extending in the row direction.
  • connection of the leaf spring 25 on the one hand to the support part 19 and on the other hand to the mounting part 21 takes place here by the fact that their ends are embedded in the two parts, the connection being further strengthened in that the ends of the leaf spring 25 are angled in opposite directions, Sections 26 and 27 or 28 and 29 alternately located one behind the other in the line direction are provided.
  • the manufacture of such a writing strip 6 can take place in such a way that the leaf spring 25 is inserted into an injection mold, in which the support part 19 and the mounting part 21 are then produced by overmolding the ends of the leaf spring 25.
  • a plurality of spring sections lying one behind the other in the row direction could be provided.
  • the printer-side assembly of the writing strip 6 on the chassis 1 is again carried out in a simple manner by a type of fastening acting on its mounting part 21.

Landscapes

  • Electronic Switches (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Handling Of Sheets (AREA)
EP89201090A 1988-05-03 1989-04-27 Imprimante thermique Expired - Lifetime EP0340855B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0114788A AT390033B (de) 1988-05-03 1988-05-03 Thermodrucker
AT1147/88 1988-05-03

Publications (3)

Publication Number Publication Date
EP0340855A2 true EP0340855A2 (fr) 1989-11-08
EP0340855A3 EP0340855A3 (en) 1990-01-24
EP0340855B1 EP0340855B1 (fr) 1993-03-10

Family

ID=3507622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89201090A Expired - Lifetime EP0340855B1 (fr) 1988-05-03 1989-04-27 Imprimante thermique

Country Status (5)

Country Link
US (1) US4940994A (fr)
EP (1) EP0340855B1 (fr)
JP (1) JPH0211360A (fr)
AT (2) AT390033B (fr)
DE (1) DE58903693D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386919A3 (fr) * 1989-03-06 1991-01-30 Tokyo Electric Co., Ltd. Imprimante thermique
IT1276494B1 (it) * 1995-07-12 1997-10-31 Olivetti & Co Spa Stampante ad impatto con barra di contrasto cedevole
JP4359775B2 (ja) * 2005-06-30 2009-11-04 ブラザー工業株式会社 画像記録装置
USD823387S1 (en) * 2016-08-08 2018-07-17 Dover Europe Sàrl Distance measuring guide for printer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6264578A (ja) * 1985-09-17 1987-03-23 Matsushita Electric Ind Co Ltd サ−マル印字装置
US4676683A (en) * 1984-01-13 1987-06-30 Canon Kabushiki Kaisha Platen support structure of recording apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908946C2 (de) * 1978-03-08 1984-10-25 Canon K.K., Tokio/Tokyo Wärmedrucker mit einem Heizelemente aufweisenden Wärmedruckkopf
US4358776A (en) * 1979-06-22 1982-11-09 Kabushiki Kaisha Suwa Seikosha Thermal printer and improved platen
JPS6011377A (ja) * 1983-07-01 1985-01-21 Canon Inc プラテン
DE3682301D1 (en) * 1985-03-15 1991-12-12 Hitachi Ltd Drucker mit thermokopf.
US4692778A (en) * 1985-03-28 1987-09-08 Canon Kabushiki Kaisha Image formation apparatus with a recording unit and paper feed cover and a sealing member
JPS61244570A (ja) * 1985-04-23 1986-10-30 Oki Electric Ind Co Ltd サ−マルプリンタ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4676683A (en) * 1984-01-13 1987-06-30 Canon Kabushiki Kaisha Platen support structure of recording apparatus
JPS6264578A (ja) * 1985-09-17 1987-03-23 Matsushita Electric Ind Co Ltd サ−マル印字装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 258 (M-618)(2705) 21 August 1987, & JP-A-62 64578 (H. FUJINO) 23 März 1987, *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 258 (M-618)(2705), JP-A-62 64578 *

Also Published As

Publication number Publication date
DE58903693D1 (de) 1993-04-15
US4940994A (en) 1990-07-10
ATA114788A (de) 1989-08-15
EP0340855A3 (en) 1990-01-24
JPH0211360A (ja) 1990-01-16
AT390033B (de) 1990-03-12
EP0340855B1 (fr) 1993-03-10
ATE86554T1 (de) 1993-03-15

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