EP0073841B1 - Butée d'impression pour imprimantes rapides, spécialement pour des imprimantes comportant une bande porte-types - Google Patents

Butée d'impression pour imprimantes rapides, spécialement pour des imprimantes comportant une bande porte-types Download PDF

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Publication number
EP0073841B1
EP0073841B1 EP81106630A EP81106630A EP0073841B1 EP 0073841 B1 EP0073841 B1 EP 0073841B1 EP 81106630 A EP81106630 A EP 81106630A EP 81106630 A EP81106630 A EP 81106630A EP 0073841 B1 EP0073841 B1 EP 0073841B1
Authority
EP
European Patent Office
Prior art keywords
pressure
abutment
pressure abutment
printers
type
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
EP81106630A
Other languages
German (de)
English (en)
Other versions
EP0073841A1 (fr
Inventor
Bruno Gantz
Ludwig Fischer
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.)
IBM Deutschland GmbH
International Business Machines Corp
Original Assignee
IBM Deutschland GmbH
International Business Machines Corp
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 IBM Deutschland GmbH, International Business Machines Corp filed Critical IBM Deutschland GmbH
Priority to DE8181106630T priority Critical patent/DE3173882D1/de
Priority to EP81106630A priority patent/EP0073841B1/fr
Priority to JP13582082A priority patent/JPS5839479A/ja
Publication of EP0073841A1 publication Critical patent/EP0073841A1/fr
Application granted granted Critical
Publication of EP0073841B1 publication Critical patent/EP0073841B1/fr
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
    • 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
    • B41J11/04—Roller platens

Definitions

  • the invention relates to print abutments for high-speed printers, in particular for type tape printers.
  • European patent application 80104963.6 (EP-A-0046 812) describes a rotating, roller-shaped pressure abutment for a type tape printer.
  • the roller In order to avoid ruts on the roller due to the rotating type belt and also to distribute the other wear of the roller over its circumferential surface, the roller is set in a very slow rotation by a gear motor.
  • roller diameter results in undesirable abrasion and deformation effects on the type carrier itself, as will be described later in more detail later.
  • the object of the invention is to provide an improved pressure abutment in order to achieve good font quality.
  • the hammer surface never hits the flat pressure abutment in parallel, which results in different blackening areas of the printed character.
  • Roller-shaped pressure abutments on the other hand, have the disadvantage of very high compressive stresses because, because of the relatively small radius of the pressure roller, there can be only approximately linear contact between the type belt and the roller.
  • the high compressive stresses lead to enormous wear on the type carrier and to plastic deformation of the same. Symbolically speaking, the roller digs itself into the type holder, so that in unfavorable cases the characters can break out of the type holder.
  • KBP pressure abutment A schematic diagram of this is shown in a sectional illustration in FIG. 2.
  • This KBP pressure abutment has four stop surfaces 8, 9, 10, 11 and an axis 12 about which the pressure abutment can be rotated. This makes it possible to set the various stop surfaces.
  • the individual stop surfaces are convex, the radius R to be assigned to their circular arc is significantly larger than the radius r, which can be assigned to an imaginary cylindrical pressure abutment, on the circumference of which the individual end points of the circular arcs of the stop surfaces 8, 9, 10, 11 lie.
  • FIG. 3 shows a sectional illustration of a practical embodiment of such a KBP pressure abutment 13. It consists of an annular steel jacket 14, at the ends of which end plates 19 are placed. Each end plate has an axle hole 17 through which a rotatable axle runs (not shown). Flanges fixedly connected to this rotatable axis are connected by screws or the like to the openings 18 of the end plates of the pressure abutment, so that this forcibly rotates with the axis when a new stop surface is to be brought into the printing position.
  • the axis is driven e.g. B. via conventional gear ratchet circuits.
  • abutment strips 15 and 16 The individual abutment surfaces, of which only two, namely 15-1 and 16-1, are shown for reasons of simplification, are provided by so-called abutment strips 15 and 16.
  • Such an abutment strip has an essentially rectangular cross section in the lower part, which is widened in the shape of a circular arc at the top.
  • the radius R to be assigned to this circular arc can be of the order of 150 mm, while the outer cylinder diameter is approximately 25 mm.
  • Recesses 19 are milled into the cylinder ring, into which the lower part of the pressure abutment strips is glued.
  • These pressure abutment strips are expediently made of a material which has a wear-reducing effect on the type strip running past the pressure abutment.
  • FIG. 4 shows a perspective view of a KBP pressure abutment 13 according to the invention according to FIG. 3.
  • the drive axle extending through the pressure abutment is identified by 20, the abutment strips as in FIG. 3 by 15 and 16.
  • the abutment strips consist of a steel support 21 and bearing material 22 for the impact surface.
  • the illustration of further pressure stop bars has also been omitted, as well as the illustration of drive means for the axis of rotation 20, to which reference was already made in the description.

Landscapes

  • Handling Of Sheets (AREA)

Claims (3)

1. Butée d'impression pouvant tourner autour d'un axe et comportant plusieurs surfaces de contact d'impression, caractérisée en ce que les surfaces de contact d'impression (8, 9, 10, 11) sont réalisées comme des parties de cylindre en forme d'arc et ont un rayon de courbure (R) qui est plus grand que l'espacement maximal entre l'axe de rotation (12) de la butée d'impression (7) et sa périphérie.
2. Structure selon la revendication 1, caractérisée en ce que les surfaces de contact d'impression sont constituées par des plaquettes de contact (15, 16) qui sont reliées à un corps porteur (14) de forme cylindrique.
3. Structure selon la revendication 2, caractérisée en ce que les plaquettes de contact (15, 16) sont logées dans des évidements (19) orientés parallèlement à l'axe (20) du corps de base.
EP81106630A 1981-08-26 1981-08-26 Butée d'impression pour imprimantes rapides, spécialement pour des imprimantes comportant une bande porte-types Expired EP0073841B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8181106630T DE3173882D1 (en) 1981-08-26 1981-08-26 Pressure abutment for high-speed printers, especially for belt-type printers
EP81106630A EP0073841B1 (fr) 1981-08-26 1981-08-26 Butée d'impression pour imprimantes rapides, spécialement pour des imprimantes comportant une bande porte-types
JP13582082A JPS5839479A (ja) 1981-08-26 1982-08-05 プラテン

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81106630A EP0073841B1 (fr) 1981-08-26 1981-08-26 Butée d'impression pour imprimantes rapides, spécialement pour des imprimantes comportant une bande porte-types

Publications (2)

Publication Number Publication Date
EP0073841A1 EP0073841A1 (fr) 1983-03-16
EP0073841B1 true EP0073841B1 (fr) 1986-02-26

Family

ID=8187870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106630A Expired EP0073841B1 (fr) 1981-08-26 1981-08-26 Butée d'impression pour imprimantes rapides, spécialement pour des imprimantes comportant une bande porte-types

Country Status (3)

Country Link
EP (1) EP0073841B1 (fr)
JP (1) JPS5839479A (fr)
DE (1) DE3173882D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605846U (ja) * 1983-06-22 1985-01-16 富士通株式会社 プラテン構造
US4597682A (en) * 1984-11-13 1986-07-01 Reflective Technology, Inc. Impact print bar assembly
DE3686826T2 (de) * 1985-03-15 1993-04-22 Hitachi Ltd Bandkassette fuer drucker.
US4722621A (en) * 1985-10-30 1988-02-02 Johnson Reynold B Keyboard assembly and recording apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US837279A (en) * 1906-02-03 1906-12-04 Charles W Bradford Platen for type-writers.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH306400A (fr) * 1949-02-15 1955-04-15 Cudell Goetz Carlos Cylindre rotatif pour machine à écrire.
JPS5513012B2 (fr) * 1972-03-28 1980-04-05
JPS5852929Y2 (ja) * 1978-07-10 1983-12-02 エプソン株式会社 ドットプリンタの印字受台
JPS5630872A (en) * 1979-08-22 1981-03-28 Tokyo Electric Co Ltd Dot printer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US837279A (en) * 1906-02-03 1906-12-04 Charles W Bradford Platen for type-writers.

Also Published As

Publication number Publication date
EP0073841A1 (fr) 1983-03-16
DE3173882D1 (en) 1986-04-03
JPH0128709B2 (fr) 1989-06-05
JPS5839479A (ja) 1983-03-08

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