EP0103591B1 - Paper advancing device in printers, typewriters or the like office machines provided with a paper magazine - Google Patents

Paper advancing device in printers, typewriters or the like office machines provided with a paper magazine Download PDF

Info

Publication number
EP0103591B1
EP0103591B1 EP83900816A EP83900816A EP0103591B1 EP 0103591 B1 EP0103591 B1 EP 0103591B1 EP 83900816 A EP83900816 A EP 83900816A EP 83900816 A EP83900816 A EP 83900816A EP 0103591 B1 EP0103591 B1 EP 0103591B1
Authority
EP
European Patent Office
Prior art keywords
sheet
paper
magazine
feed means
machine
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
EP83900816A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0103591A1 (en
Inventor
Göte Christer PERSSON
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.)
Facit AB
Original Assignee
Facit 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 Facit AB filed Critical Facit AB
Publication of EP0103591A1 publication Critical patent/EP0103591A1/en
Application granted granted Critical
Publication of EP0103591B1 publication Critical patent/EP0103591B1/en
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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section

Definitions

  • the present invention relates to a printer, typewriter or like office machine provided with a paper magazine and particularly relates to a paper advancing device for such a machine as defined in the preamble of the Claim (US-A--4268021).
  • One method of avoiding the above-mentioned slip is to let the machine give an order for advancing assistance from the paper magazine simultaneously as it starts its own friction feed. Advancing assistance can then be given under the major portion of the transfer distance. However, advancing assistance must be broken off during the latter part of conveying the sheet, due to variation in the length of the sheet. For example, if the magazine is allowed to give advancing assistance for a distance which is too long, there is the risk that subsequent sheets are also advanced a minor amount. The advancing errors. thus occurring will accumulate, so that after a plurality of sheet advances it may happen that simultaneously with a sheet being correctly advanced into the printer, subsequent sheets will at least partially be fed into it with a breakdown of the paper feed as a result.
  • a separation means In paper magazines of the kind mentioned, it is usual to arrange some form of separation means, for ensuring that only one sheet at a time is advanced from the magazine.
  • a separation means often used comprises two oblique edges extending over and partially covering the forward corners, seen in the advancing direction, of a paper holder arranged in the magazine. Thereby the uppermost sheet in the holder will be lifted in its central portion on being advanced, while the forward corners are retained by the oblique edges and the sheet is separated from remaining sheets in the holder before the sheet is entirely released from these oblique edges.
  • the uppermost sheet in the magazine be advanced without subsequent sheets being affected. If advancing assistance is to be obtained from the magazine along the entire length of the sheet, a subsequent sheet may also be somewhat affected, so that it assumes its curved separating position. If the sheet remains thus for any length of time, it may receive a durable deformation which makes subsequent conveyance through the magazine and the paper channels arranged in the printer more difficult. To obviate this problem it is desirable that the magazine advancing assistance be extended so that a subsequent sheet is also advanced so far that the separation position has been passed, although without the occurrence of any accumulated advancing error, as mentioned above.
  • An object of the invention is to remove the drawbacks mentioned above, and to provide a paper advancing device of the kind in question, allowing a sheet of paper to be transferred without being pulled out of line and with controlled advance of subsequent sheets from the paper magazine to a printing start position in the typewriter.
  • the object is achieved with a paper advancing device having the characterizing features disclosed in the claim.
  • Figures 1-3 schematically illustrate a section through a paper magazine connected to a printer, with a sheet of paper depicted in different positions during transfer from the magazine to the printer.
  • Figures 4 and 5 are sections as in Figures 1-3 but depict the path of a sheet while being advanced from the printer to the paper magazine.
  • a paper magazine 10 is schematically illustrated in Figure 1, and arranged above the printer, which is only indicated in the Figure and denoted by the numeral 11.
  • Two paper holders 12, 13 are arranged in the magazine, each having at their lower edges an aperture 14 through which the sheets are advanced.
  • There is also an opening in each holder accommodating a friction feed means 15 in the form of a drive roll engaging against the uppermost sheet 29 of a stack 30 of sheets in the holder.
  • Engagement pressure between the drive roll 15 and the sheet is created by a movable side wall 31, against which the stack in the holder rests, the side wall being urged against the drive roll by springs 32.
  • a chute 16 from the holder 12 and a chute 17 from the holder 13 guide a sheet from the respective holder into a feed channel 18 from the paper magazine.
  • the channel 18 opens out into a friction feed means arranged in the printer in the shape of a friction belt 19 and associated backup rolls, of which an upper one is illustrated in the Figure and has the denotation 20.
  • the latter For advancing a ready-printed document 34 to the paper magazine, the latter has a channel 21 for leading the document via a drive roll 22 and associated backup roll 23 to a collection compartment 24.
  • a motor 25 is adapted for driving the drive roll 22 and the drive roll 15 associated with the folder 12, via unillustrated toothed belts.
  • a motor 26 is adapted for driving the drive roll associated with the holder 13.
  • a sensing means 27 is arranged in order to indicate the position of a sheet which is to be advanced into or out from the printer.
  • the sensing means 27 consists of a reflecting opto-unit, e.g. comprising a light emitting diode and a phototransistor.
  • the diode emits light towards a reflecting surface 28, from which the light is reflected towards the phototransistor.
  • a paper intervenes between the sensing means 27 and the reflecting surface 28 substantially less light will be reflected back again to the opto-unit phototransistor, which can thereby indicate that the forward edge of the paper, seen in the advancing direction, has passed.
  • the advancing sequence is controlled by a unit arranged in the printer, and not described in greater detail, said unit preferably being a microcomputer.
  • An advancing sequence is accordingly initiated by the control unit giving an order for the transfer of a sheet from the paper magazine.
  • the motor 25 then starts and the drive roll 15 advances the uppermost sheet 29 in the paper holder 12 to the position shown in Figure 1, in which the paper is just about to pass the beam of light rays from the opto-unit.
  • the sensing means 27 sends a signal to the control unit ordering the motor 25 to drive the roll 15 to advance the paper a predetermined distance to bring it into contact with the friction feed means 19, 20, the sheet 29 being inserted in the space between the friction drive belt 19 and the backup roll 20 in the printer as illustrated in Fig. 2. In this position the rear part of the sheet has still not left the paper magazine 10.
  • the control unit orders advance of the sheet with a certain excess whereby the forward edge of the sheet is urged into said space.
  • the control unit now orders a motor (unillustrated), arranged in the printer, to start the friction belt 19 for continued advance of the sheet to a printing start position in the printer.
  • the control unit simultaneously requests advancing assistance from the paper magazine, whereby the drive roll 15 is also activated. Advancing help remains as long as any part of the sheet is in contact with the drive roll 15.
  • Oblique edges covering the forward corner edges of the paper are arranged in the paper holder 12 in conjunction with advancing aperture 14.
  • the object of this is to ensure that only one sheet at a time is advanced.
  • the drive roll 15 is activated for a length of time such that a subsequent sheet 33 is also advanced a minor distance.
  • the advantage of this is that the subsequent sheet is advanced such that is passes the separating edges and thus assumes a flat unaffected condition. No accumulated advancing errors occur if the advance of the subsequent sheet is stopped before the forward edge thereof has passed the sensing means 27.
  • the motor 25 is stopped and the friction drive belt 19 by itself advances the sheet to the print start position.
  • a ready-printed document is advanced via the paper channel 21 by the drive roll 22 and backup toll 23 to the collection compartment 24.
  • the sensing means 27 can here be utilized for indicating that a sheet is fed up from the printer and also that the sheet has passed the common paper channel 18, so that a new sheet can be fed down from the paper magazine.
  • Figure 4 illustrates a sheet during advance through the paper channel 21, while Figure 5 shows the paper in the collection compartment 24.

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)
  • Handling Of Cut Paper (AREA)
EP83900816A 1982-03-08 1983-03-04 Paper advancing device in printers, typewriters or the like office machines provided with a paper magazine Expired EP0103591B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8201399 1982-03-08
SE8201399A SE444536B (sv) 1982-03-08 1982-03-08 Pappersmatningsanordning vid en med pappersmagasin forsedd skrivare, skrivmaskin eller liknande kontorsmaskin

Publications (2)

Publication Number Publication Date
EP0103591A1 EP0103591A1 (en) 1984-03-28
EP0103591B1 true EP0103591B1 (en) 1986-11-12

Family

ID=20346183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83900816A Expired EP0103591B1 (en) 1982-03-08 1983-03-04 Paper advancing device in printers, typewriters or the like office machines provided with a paper magazine

Country Status (6)

Country Link
EP (1) EP0103591B1 (it)
JP (1) JPS59500307A (it)
DE (1) DE3367559D1 (it)
IT (1) IT1212710B (it)
SE (1) SE444536B (it)
WO (1) WO1983003075A1 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH661478A5 (de) * 1983-11-15 1987-07-31 Kurt Ruenzi Vorrichtung zum vereinzeln und zum einzug von blaettern in eine bueromaschine.
JPS62111772A (ja) * 1985-11-09 1987-05-22 Fujitsu Ltd プリンタにおける単票のセツト方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2309756A1 (de) * 1973-02-27 1974-09-12 Licentia Gmbh Einrichtung zur abgabe von einzelnen briefen und aehnlichen flachen sendungen aus einem stapel
US4089402A (en) * 1976-07-01 1978-05-16 Hy Grip Products Co. Sheet feeding mechanism for an automatic typewriter
CH620652A5 (it) * 1978-01-23 1980-12-15 Rutishauser Data Ag

Also Published As

Publication number Publication date
SE8201399L (sv) 1983-09-09
WO1983003075A1 (en) 1983-09-15
IT1212710B (it) 1989-11-30
IT8319946A0 (it) 1983-03-08
DE3367559D1 (en) 1987-01-02
JPS59500307A (ja) 1984-03-01
EP0103591A1 (en) 1984-03-28
SE444536B (sv) 1986-04-21

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