EP0171573A2 - Appuis de contre-pression pour machine à écrire, notamment pour imprimantes en matrices - Google Patents

Appuis de contre-pression pour machine à écrire, notamment pour imprimantes en matrices Download PDF

Info

Publication number
EP0171573A2
EP0171573A2 EP85108183A EP85108183A EP0171573A2 EP 0171573 A2 EP0171573 A2 EP 0171573A2 EP 85108183 A EP85108183 A EP 85108183A EP 85108183 A EP85108183 A EP 85108183A EP 0171573 A2 EP0171573 A2 EP 0171573A2
Authority
EP
European Patent Office
Prior art keywords
writing
abutment
oxide
friction
base body
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
EP85108183A
Other languages
German (de)
English (en)
Other versions
EP0171573B1 (fr
EP0171573A3 (en
Inventor
Gerhard Lohrmann
Günter Engelhardt
Thomas Werner
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT85108183T priority Critical patent/ATE51188T1/de
Publication of EP0171573A2 publication Critical patent/EP0171573A2/fr
Publication of EP0171573A3 publication Critical patent/EP0171573A3/de
Application granted granted Critical
Publication of EP0171573B1 publication Critical patent/EP0171573B1/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
    • B41J11/04—Roller platens

Definitions

  • the invention relates to a writing abutment for typewriters, in particular for matrix printers. with a support body on which the record carrier can be transported by friction,
  • Such abutments are used for the air gap-free support and also to drive a recording medium in the feed direction, i.e. perpendicular to the direction of the writing line.
  • the transport of single sheets or of continuous recording media which can each consist of paper of one or more layers, are subject to different friction.
  • the abutments in typewriters and partly in matrix printers transport the record carrier over rubber rollers or special plastic rollers. Both the rubber rollers and the plastic rollers are assigned a high friction value on the surface.
  • the printing elements of which consist of printing needles or printing hammers with special pressure peaks or printing balls a pressure abutment which has greater hardness values of the surface with increasing writing speed is sought. It has now been found that with harder pen bearings, e.g. in the case of aluminum rollers, the friction value drops, so that it is no longer possible to take the record carrier with you.
  • the invention has for its object to provide a wear-resistant pressure abutment for high printing speeds with hard strokes, with high surface hardness and with high coefficients of friction.
  • the object is achieved according to the invention in that materials which can be processed in a plasma or flame spray process and have a layer thickness of 0.01 mm to 5 mm are applied to a body with an outer writing abutment surface on which the recording medium rests.
  • Such a surface has sufficient hardness for writing with a hard stroke, i.e. also in the matrix printing process, and extremely high friction compared to common recording media, e.g. those made from the most varied types of paper.
  • the wear-resistant abutment according to the invention therefore ensures a clean, easy-to-read typeface and safe transport of the recording medium even at high writing speeds.
  • the required coefficients of friction can also be set using variable roughness depths.
  • a platen roller can be economically and technically flawlessly designed in that the basic body is formed into a body with an externally precise circular profile by means of oxide ceramic materials applied in the plasma process.
  • An undersized diameter of the base body can advantageously be compensated for.
  • the layer thickness of the oxide ceramic material is uniformly 0.020 mm.
  • the sprayable materials which advantageously have satisfactory adhesion properties on a base body are selected in such a way that the oxide-ceramic material consists of aluminum oxide, titanium oxide or chromium oxide or a mixture of these materials.
  • the base body consists of a heat-resistant metal body or plastic body with a normally machined surface in central areas.
  • the writing abutment is designed as a cylindrical writing roller and that axially limited, radially smoothed zones are provided within the roller length. This design avoids abrasion of the usual paper deflecting means.
  • the only figure in the drawing represents a side view of the print head with a printing abutment of a matrix printer.
  • the print head 1 of the matrix printer is designed as a dot-matrix print head and moves in writing operation perpendicular to the plane of the drawing in front of the platen 2, which shows a cylindrical platen as a support body, around which the recording medium 3 is guided and moved in the feed direction 4.
  • the movement in the feed direction 4 can between the pressure passes in steps or done continuously during a print pass.
  • the print head 1 is guided parallel to the axis 5 of the platen 2 in uniform reciprocating movements. During this time, the (not visible) print needles or print hammers emerge from the front print head 1 a and hit an ink ribbon 6 in order to leave print dots on the recording medium 3.
  • the writing abutment 2 consists of a base body 7 made of plastic or aluminum, onto which oxide-ceramic materials 8 with a layer thickness 9 of 0.01 mm to 5 mm are sprayed onto a body with an outer writing abutment surface 10.
  • the body formed from the base body 7 and the layer thickness 9 has a circular profile 11 in the exemplary embodiment shown.
  • the base body 7 is coated with a uniform layer thickness 9 of 0.020 mm.
  • the layer material 8 consists of aluminum oxide, titanium oxide or chromium oxide or a mixture of these materials.
  • the writing abutment surface 10 has a roughness depth which can be adjusted when spraying and which is particularly suitable for the matrix printing process.
  • the recording medium 3 is also pressed onto the abutment surface 10 by means of a plurality of pressure rollers 12 in order to bring the frictional force into effect.
  • Axially limited, radially smoothed zones 13 are provided on the cylindrical platen roller, against which paper deflecting means 14 abut without wearing out.

Landscapes

  • Handling Of Sheets (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Vehicle Body Suspensions (AREA)
EP85108183A 1984-08-16 1985-07-02 Appuis de contre-pression pour machine à écrire, notamment pour imprimantes en matrices Expired - Lifetime EP0171573B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85108183T ATE51188T1 (de) 1984-08-16 1985-07-02 Schreibwiderlager fuer schreibmaschinen, insbesonder fuer matrixdrucker.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3430092A DE3430092C1 (de) 1984-08-16 1984-08-16 Schreibwiderlager fuer Schreibmaschinen,insbesondere fuer Matrixdrucker
DE3430092 1984-08-16

Publications (3)

Publication Number Publication Date
EP0171573A2 true EP0171573A2 (fr) 1986-02-19
EP0171573A3 EP0171573A3 (en) 1987-04-15
EP0171573B1 EP0171573B1 (fr) 1990-03-21

Family

ID=6243157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85108183A Expired - Lifetime EP0171573B1 (fr) 1984-08-16 1985-07-02 Appuis de contre-pression pour machine à écrire, notamment pour imprimantes en matrices

Country Status (5)

Country Link
US (1) US4881838A (fr)
EP (1) EP0171573B1 (fr)
JP (1) JPS6151368A (fr)
AT (1) ATE51188T1 (fr)
DE (1) DE3430092C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08244295A (ja) * 1995-03-14 1996-09-24 Asahi Optical Co Ltd 感熱プリンタおよびその使用方法
JP3484861B2 (ja) * 1995-03-31 2004-01-06 セイコーエプソン株式会社 画像形成装置用のローラ及びその成形用金型
JPH1177586A (ja) * 1997-09-04 1999-03-23 Mitsubishi Heavy Ind Ltd ロータリカットオフ装置
DE69809992T2 (de) * 1997-04-11 2003-07-24 Metso Paper, Inc. Walze für eine Papier- oder Kartonmaschine und Verfahren zur Herstellung der Walze
US6244768B1 (en) * 1999-03-02 2001-06-12 Printronix, Inc. Resilient elastomeric line printer platen having outer layer of hard material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1347333A (en) * 1919-02-10 1920-07-20 Houston Constance Mab Meredith Typewriting-machine
DE2363678A1 (de) * 1973-12-21 1975-07-03 Maschf Augsburg Nuernberg Ag Leitwalze fuer druckmaschinen, sowie verfahren zur herstellung einer leitwalze und vorrichtung zur durchfuehrung des verfahrens
US4242003A (en) * 1978-10-16 1980-12-30 Xerox Corporation Multi-pass matrix printing
DE8412156U1 (de) * 1984-04-18 1984-07-19 Lang, Werner Transportwalze fuer typenraddrucker

Also Published As

Publication number Publication date
ATE51188T1 (de) 1990-04-15
EP0171573B1 (fr) 1990-03-21
US4881838A (en) 1989-11-21
EP0171573A3 (en) 1987-04-15
DE3430092C1 (de) 1986-02-27
JPS6151368A (ja) 1986-03-13

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