EP0195761A1 - Mécanisme d'avance de papier pour imprimantes - Google Patents

Mécanisme d'avance de papier pour imprimantes Download PDF

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Publication number
EP0195761A1
EP0195761A1 EP19860850056 EP86850056A EP0195761A1 EP 0195761 A1 EP0195761 A1 EP 0195761A1 EP 19860850056 EP19860850056 EP 19860850056 EP 86850056 A EP86850056 A EP 86850056A EP 0195761 A1 EP0195761 A1 EP 0195761A1
Authority
EP
European Patent Office
Prior art keywords
platen
web
advancing
paper web
paper
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.)
Withdrawn
Application number
EP19860850056
Other languages
German (de)
English (en)
Inventor
Bror Gösta Helmfrid
Leif Helmer Andersson
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP0195761A1 publication Critical patent/EP0195761A1/fr
Withdrawn legal-status Critical Current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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • B41J15/06—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles characterised by being applied to printers having stationary carriages

Definitions

  • the present invention relates to a paper feed arrangement in printers which are provided with a cylindrical platen and advancing means for advancing a printing medium in the form of a paper web or the like, engagement between the advancing means and the paper web taking place either in front of, or both in front and behind, the platen with respect to the advancing direction of the web.
  • the printing medium is usually a paper web with perforations at its edges for advancing the web.
  • the movement of the latter in relation to the print position of the printer is obtained by advancing means provided with teeth cooperating with the perforations in the paper such as to advance the web forwards or backwards relative the print position.
  • advancing means provided with teeth cooperating with the perforations in the paper such as to advance the web forwards or backwards relative the print position.
  • tractor feeders are usual on the market and are known, inter alia, from the US patent specification 3 825 162.
  • Tractor feed is mainly of two types, single or push-pull traction.
  • the paper web is moved with the aid of the tractor feeder via conducting means past a cylindrical or flat platen, against which printing is performed.
  • push-pull traction the feed to the print position takes place in the same way as for single traction, but down-stream of the print position the perforations in the paper web are brought into engagement with an other section of the feeder where the teeth move in the opposite direction to those advancing the paper web towards the print position, thus obtaining an advance away from the position as a supplement to the paper advance in a single- traction feeder.
  • the object of the invention is to solve the above problem by providing between paper web and platen sufficient friction to prevent relative movement therebetween when a line is being printed.
  • the parts of a printer which are only schematically illustrated in Figure 1, include a tractor feeder 1 which advances a paper web 2 via a deflecting means 3 and two conducting members 4 and 5 to a cylindrical platen 6.
  • the web 2 accompanies the rotation of the platen 6 to a print position 7 with the aid of two counter-pressure rollers 8 and 9 and two conducting members 10 and 11.
  • the web 2 is then advanced out of the printer between two conducting plates 12 and 13.
  • An unillustrated drive means includes a motor driving the platen via spur gearing.
  • the means also drives the tractor feeder 1 via second spur gearing between the platen and feeder.
  • the ratio between the two sets of spur gearing is selected such that the peripheral rate of the platen is somewhat higher than the advancing rate of the feeder, the difference being about 0,2 %.
  • the two counter-pressure rollers 8 and 9 constitute parts of a friction means. They are mounted in two U-shaped cheek plates 14, which are kept together by a shaft 15. The shaft is radially guided by two projections 16 and 17 on the conducting member 10.
  • the friction means further includes an unillustrated operating means for determining the position in height of the shaft 15 via a rod 18. In an upper position the two rollers 8 and 9 engage against the platen 6 with a force such that the friction force between the paper web and the platen prevents any relative movement between them. This force is equal to zero in a lower, unillustrated position of the shaft 15.
  • the operating means functions so that the shaft 15 normally assumes its upper position.
  • the operating means By controlling a printer carriage associated with the printer such that it moves to an extreme position outside the printing area the operating means is actuated to move the rod 18 downwards, the force between the rollers and the platen thus becoming zero.
  • the printer carriage is controlled by a computer connected to the printer such as to assume the extreme position at about every 30th line shift.
  • the platen advances the paper web somewhat further than the tractor feeder does.
  • the length of paper web between the tractor feeder and platen is thus shortened, resulting in a tensional force in the paper web.
  • This force is limited by the spring bias in a spring 19 co-acting with the deflecting means 3, which includes a bar disposed substantially transverse the advancing direction of the paper web and mounted on a shaft 20, such that the bar turns clockwise about the shaft at a line shift.

Landscapes

  • Advancing Webs (AREA)
  • Handling Of Sheets (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)
  • Handling Of Cut Paper (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
EP19860850056 1985-03-20 1986-02-19 Mécanisme d'avance de papier pour imprimantes Withdrawn EP0195761A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8501357A SE447224B (sv) 1985-03-20 1985-03-20 Pappersmatningsanordning for en skrivare
SE8501357 1985-03-20

Publications (1)

Publication Number Publication Date
EP0195761A1 true EP0195761A1 (fr) 1986-09-24

Family

ID=20359566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860850056 Withdrawn EP0195761A1 (fr) 1985-03-20 1986-02-19 Mécanisme d'avance de papier pour imprimantes

Country Status (3)

Country Link
EP (1) EP0195761A1 (fr)
JP (1) JPS61229582A (fr)
SE (1) SE447224B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0297486A2 (fr) * 1987-06-30 1989-01-04 Seiko Epson Corporation Appareil d'entraînement de papier pour les imprimantes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160606A (en) * 1974-09-27 1979-07-10 Honeywell Information Systems Italia Paper feed mechanism for multiple copy printer
US4165029A (en) * 1977-09-28 1979-08-21 Silonics, Inc. Paper advance mechanism for an ink jet printer
EP0075109A2 (fr) * 1981-09-21 1983-03-30 International Business Machines Corporation Appareil à secousses pour rouleau d'alimentation en bande
EP0123310A2 (fr) * 1983-04-26 1984-10-31 Siemens Aktiengesellschaft Alimentation en feuilles et en bandes pour imprimantes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160606A (en) * 1974-09-27 1979-07-10 Honeywell Information Systems Italia Paper feed mechanism for multiple copy printer
US4165029A (en) * 1977-09-28 1979-08-21 Silonics, Inc. Paper advance mechanism for an ink jet printer
EP0075109A2 (fr) * 1981-09-21 1983-03-30 International Business Machines Corporation Appareil à secousses pour rouleau d'alimentation en bande
EP0123310A2 (fr) * 1983-04-26 1984-10-31 Siemens Aktiengesellschaft Alimentation en feuilles et en bandes pour imprimantes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0297486A2 (fr) * 1987-06-30 1989-01-04 Seiko Epson Corporation Appareil d'entraînement de papier pour les imprimantes
EP0297486A3 (en) * 1987-06-30 1990-02-28 Seiko Epson Corporation Paper feeding apparatus for printers

Also Published As

Publication number Publication date
SE8501357D0 (sv) 1985-03-20
JPS61229582A (ja) 1986-10-13
SE8501357L (sv) 1986-09-21
SE447224B (sv) 1986-11-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: ANDERSSON, LEIF HELMER

Inventor name: HELMFRID, BROR GOESTA