EP0297486B1 - Papierzuführvorrichtung für Drucker - Google Patents

Papierzuführvorrichtung für Drucker Download PDF

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Publication number
EP0297486B1
EP0297486B1 EP19880110230 EP88110230A EP0297486B1 EP 0297486 B1 EP0297486 B1 EP 0297486B1 EP 19880110230 EP19880110230 EP 19880110230 EP 88110230 A EP88110230 A EP 88110230A EP 0297486 B1 EP0297486 B1 EP 0297486B1
Authority
EP
European Patent Office
Prior art keywords
paper
feeding
platen
roller
pressing member
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 - Lifetime
Application number
EP19880110230
Other languages
English (en)
French (fr)
Other versions
EP0297486A3 (en
EP0297486A2 (de
Inventor
Satoshi Fujioka
Tatsuya Seshimo
Koichiro Yokoyama
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson 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
Priority claimed from JP62163495A external-priority patent/JPH0811461B2/ja
Priority claimed from JP16349687A external-priority patent/JPS648066A/ja
Priority claimed from JP17640487A external-priority patent/JP2681932B2/ja
Priority claimed from JP62176405A external-priority patent/JP2689430B2/ja
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of EP0297486A2 publication Critical patent/EP0297486A2/de
Publication of EP0297486A3 publication Critical patent/EP0297486A3/en
Application granted granted Critical
Publication of EP0297486B1 publication Critical patent/EP0297486B1/de
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
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • 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
    • B41J11/48—Apparatus for condensed record, tally strip, or like work using two or more papers, or sets of papers, e.g. devices for switching over from handling of copy material in sheet form to handling of copy material in continuous form and vice versa or point-of-sale printers comprising means for printing on continuous copy material, e.g. journal for tills, and on single sheets, e.g. cheques or receipts
    • 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
    • B41J13/02—Rollers
    • B41J13/03—Rollers driven, e.g. feed rollers separate from platen
    • 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
    • B41J15/16—Means for tensioning or winding the web

Definitions

  • the present invention relates to a paper feeding apparatus for a printer.
  • a roller having a diameter smaller than the platen provided at the upper portion of a printing head and located at the feeding-out side with respect to the printing head is pressed against the platen with said paper therebetween to generate frictional force, whereby the fed-out portion of paper after printing is drawn.
  • the paper feeding speed of the supplying side and that of the feeding-out side are both determined by the platen so that no difference is caused between both speeds.
  • the main power is not provided by a platen but by a sprocket or a belt having pins to be inserted into the feeding holes. Therefore, a fine difference of speed between the platen and the sprocket is caused due to changes of the ambient temperature, and paper sagging, tearing of feeding holes and other troubles are caused by repeating paper feeding for a long distance.
  • High positional accuracy of the paper with respect to a printing head and stable paper feeding over a long period of time cannot be achieved in the above method.
  • the document EP-A-0 195 761 discloses a paper feeding apparatus for a printer, comprising a cylindrical platen, a paper feeding tractor for feeding fan-fold paper, arranged at the upstream side of said platen with respect to the paper feeding direction and a power mechanism for driving said platen and said paper feeding tractor.
  • the platen is driven to advance the paper at a slightly higher speed than is done by the paper feeding tractor.
  • the paper feeding tractor may be used in a push-pull operation to additionally provide a paper feed on the downstream side of the platen.
  • the document US-A-4,360,279 discloses a paper feeding apparatus for a printer, comprising a flat platen, a paper feeding tractor for feeding fan-fold paper, arranged at the upstream side of said platen with respect to the paper feeding direction, a power mechanism for driving said paper feeding tractor, a roller located at the downstream side of said platen and coupled to said power mechanism to rotate with a higher circumferential speed than that of the paper feeding tractor, and a pressing member for pressing the paper which is fed out from the upper side of the platen after printing, against said roller.
  • a roller made of rubber or similar material is provided at the upper portion of the platen, which corresponds to the slip stream side in the paper-feeding direction with respect to the printing head, and the roller is rotated at the same or a higher peripheral speed as the peripheral speed of the platen, whereby printed paper is fed out to contact the periphery of the roller and is drawn by frictional force thereof. Therefore, paper is fed accurately and steadily in any ambient condition or with any kind of paper, without tear of paper, jamming, inferiority of the paper feeding accuracy caused by a deflection of paper.
  • the embodiments described below are used in a serial type impact dot printer as an example.
  • the embodiment of Fig. 1 is a printer wherein paper is guided to the feeding-out roller in use of a paper bail provided with a movable shaft.
  • a paper bail provided with a movable shaft.
  • a fixed paper-path for guiding the paper is provided in the embodiment of Fig. 2 .
  • the embodiment of Fig. 3 has a paper bail such as in Fig. 1 and a roller to press the feeding-out roller with the paper therebetween.
  • Fig. 1(a) is a plan view and Fig. 1(b) is a sectional view of a first embodiment.
  • platen 5 For wrapping printing paper 13 around platen 5 made of rubber or a similar material, and positioning and feeding it toward printing head 7, platen 5 is arranged such that a space is defined between platen 5 and printing head 7 during reciprocating movement of the latter in the direction of arrow a.
  • d At an upstream position of printing head 7 with respect to the paper feeding direction d (Fig.
  • paper feeding rollers 8 and 9 are arranged below the platen, and a paper guide plate 10 for guiding the leading edge of paper 13 toward the front of printing head 7 is arranged so as to partly wrap around the peripheral surface of platen 5 with a space therebetween from the vicinity of a tractor 11 (described later) to the vicinity of the lower portion of printing head 7. Further, at the upstream side of paper guide plate 10, tractor 11 utilizing a belt with pins having the same diameter and pitch as those of feeding holes of fanfold paper is arranged.
  • a rod movable in the direction of arrow e as a paper bail 12 for guiding the leading edge of printing paper 13 toward the gap between a paper feeding-out roller 1 and an auxiliary paper feeding-out roller 2 is disposed above printing head 7.
  • paper bail 12 at the downstream side in the paper feeding direction, paper feeding-out rollers 1 having the same friction coefficient as rubber or the like and being driven in the direction of arrow c to draw printing paper 13, and auxiliary paper feeding-out rollers 2 are disposed.
  • auxiliary rollers 2 overlaps by h with that of feeding-out rollers 1, and there is a space in between each side of a feeding-out roller 1 and the adjacent auxiliary roller 2.
  • Feeding-out rollers are fixed to feeding-out roller shaft 3 by press fitting or the like for preventing idle running, so that it rotates with the feeding-out roller shaft.
  • Auxiliary feeding-out rollers 2 are rotatably supported on auxiliary feeding-out roller shaft 4, so that friction load with respect to the movement of paper is not caused at the contact portion of feeding-out roller 2 with the printing paper and paper feeding-out rollers 2 can perform idle running.
  • Auxiliary feeding-out roller shaft 4 is fixed at frame 19 in order not to allow an idle running.
  • Feeding-out roller shaft 3 and platen 5 pass through and engage with frame 19 and are positioned so as to be smoothly rotatable.
  • the portion of shaft 3 and that of the shaft of the platen 5, projecting from frame 19 are fixed to gears 16 and 18, respectively so as not to cause idle running.
  • Paper feeding motor 6, platen 5 and paper feeding-out roller shaft 3 are mechanically coupled by a gear train consisting of gears 14 to 18.
  • tractor 11 is not utilized and printing paper is directly inserted between paper guide plate 10 and platen 5.
  • a cut sheet is pressed against platen 5 with high load by paper feeding rollers 8 and 9 (shown by imaginary lines in Fig. 1(b)) and the cut sheet is positioned and moved in accordance with the rotation of platen 5 by frictional force. Accordingly, since printing paper is fed by the peripheral surface of platen 5 which is the area where printing is actually effected, the positional accuracy with respect to printing is high.
  • paper feeding rollers 8 and 9 are separated from platen 5 as shown in Fig. 1(b), and printing paper 13 is hooked by pins of tractor 11 and is inserted into an opening between paper guide plate 1 and the periphery of platen 5.
  • both cut sheet and fanfold paper are fed toward paper bail 12, wrapping around the periphery of platen 5 through the front of printing head 7.
  • Paper bail 12 is located at the position apart from platen 5 shown by a broken line in Fig.
  • paper bail 12 moves to the position indicated by a solid line in the direction of arrow e and guides the leading edge so that it is drawn automatically into the opening between feeding-out roller 1 and auxiliary feeding-out roller 2.
  • the power for the series of paper feeding operations is obtained by the rotational force of paper feed motor 6.
  • Pinion gear 14 fixed to the tip portion of the motor axis is rotated by the rotation of motor 6, and the rotational power is transmitted to platen gear 16 which is fixed to the shaft of platen 5 to rotate platen 5 through reduction gear 15. Further, platen gear 16 rotates several feeding-out rollers 1 fixed to feeding-out roller shaft 3 in the column direction by rotating feeding-out roller gear 18 fixed to shaft 3 through transmission gear 17.
  • the peripheral speed Vb of platen 5 is the same as or lower than the peripheral speed Vc of feeding-out rollers 1 by several percents (Vc > Vb).
  • tractor 11 is so arranged that the peripheral speed Va of the tractor and the peripheral speed Vb of the platen have the relation Vb ⁇ Va.
  • feeding-out rollers 1 and auxiliary feeding-out rollers 2 are so arranged that they overlap each other by an amount h (as shown in the cross sectional view of Fig. 1(b)) and are arranged with a gap i therebetween (as shown in the plan view of Fig. 1(a)). Therefore, the paper inserted between these rollers is sagged and is pressed against each roller by the restoring force of the paper, and the paper is fed out in accordance with the rotation of these rollers by the frictional force generated between the paper and the rollers.
  • the restoring force of the paper due to the sagging differs depending on the kind of paper, so that thicker paper has a stronger restoring force.
  • the feeding force generated by platen 5 located at an intermediate position in the paper feeding mechanism is not utilized since paper bail 12 is not pressed directly against platen 5 with the paper therebetween but is used only for guiding the paper being apart from platen 5, so that it depends on the contact angle of paper with respect to platen 5 and the feeding-out force generated by feeding-out roller 1. Therefore, the feeding force has the same relation as that of the feeding-out force and is self-controlled in accordance with the thickness of paper.
  • the amount of sagging, tear, friction coefficient of feeding-out rollers 1 and that of platen 5 are changed due to a change in the ambient temperature or the ambient humidity, a change in rigidity of the paper itself is caused, whereby the feeding-out force from feeding-out rollers 1 and the feeding force from platen 5 are changed.
  • the feeding-out force is increased with a rise of paper rigidity to prevent sagging.
  • the friction coefficient is increased at high ambient temperatures and paper is made to sag less easily, the feeding-out force is decreased with a lowering of paper rigidity to prevent tear of the paper.
  • a guide cover 20 which is integrally formed from transparent resin is utilized in place of a paper bail and auxiliary feeding-out rollers.
  • a rib portion 20a is integrally formed with a plate portion 20b extending in the column direction. Paper is guided by the ridgeline portion of rib portion 20a. Both ends of paper guide cover 20 are fixed to frame 19 by screws 21.
  • a sprocket wheel 22 and sprocket cover 23 for preventing the paper from rising up are arranged in place of a tractor utilizing a belt when fanfold paper with holes for feeding is utilized. The operation and the effect are almost the same as that of the above embodiment.
  • rib portions 20a of paper guide cover 20 are arranged on both sides of a feeding-out roller 1 at a distance i from the roller and overlapping by amount h, so that the control of the feeding-out force in accordance with the paper sagging is the same as in the above embodiment.
  • tractor 11 utilized in the above embodiment can be also utilized.
  • Fig. 3 showing a third embodiment wherein auxiliary feeding-out rollers 2a are arranged so as to be directly pressed against feeding-out rollers 1, instead of being arranged at both ends of feeding-out rollers 1.
  • the pressing load is produced by a tension spring 31 attached between the end portion of auxiliary feeding-out roller shaft 4 and a spring peg 25 projecting through feeding-out roller frame 30.
  • Feeding-out roller shaft 3, feeding-out roller gear 18 and transmission gear 17 are fixed to a feeding-out roller frame 30 and form a removable unit which is separate from frame 19.
  • Paper bail 12 is fixed to a paper bail lever 24 pivoting on a shaft 28 projecting through frame 19 and is rotatable in the direction of arrow e.
  • Printing paper 13 is pressed by a pressure force produced by a tension spring 32 connecting shaft 29 projecting through frame 19, and shaft 27 projecting through paper bail lever 24. Further, when the above unit is mounted, paper bail lever 24 is adjusted by stopper pin 26 projecting through feeding-out roller frame 30, whereby paper bail 12 is kept away from platen 5 as shown in Fig. 3. On the other hand, when the unit is not mounted, paper bail 12 is utilized as in a conventional printer, i.e. paper bail 12 is pressed against the periphery of platen 5 by tension spring 31, and another unit such as a cut sheet feeder can be mounted. The other arrangement is the same as with the first embodiment shown in Fig. 1.
  • an auxiliary feeding-out roller in place of contacting printing paper with feeding-out roller 1 by the restoring force produced by paper sagging due to an overlapping of feeding-out roller 1 with auxiliary feeding-out roller 2a, an auxiliary feeding-out roller is pressed by tension spring 31 against feeding-out roller 1 with printing paper 13 therebetween, so that the feeding-out force for printing paper 13 is determined by the load of tension spring 31 and the surface friction coefficient of feeding-out roller 1.

Landscapes

  • Handling Of Sheets (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)

Claims (7)

  1. Papiertransportvorrichtung für einen Drucker, umfassend:
       eine Schreibwalze (5),
       einen Papiertransporttraktor (11) zur Zuführung von Endlospapier (13), der an der Einlaufseite der Schreibwalze (5) in bezug auf die Papiertransportrichtung (d) angeordnet ist,
       einen Kraftmechanismus (6, 14 - 18) zum Antreiben der Schreibwalze (5) und des Papierstransporttraktors (11),
       eine an der Auslaufseite der Schreibwalze angeordnete Rolle (1), die mit dem Kraftmechanismus gekoppelt ist, um sich mit der gleichen oder einer höheren Umfangsgeschwindigkeit als die der Schreibwalze (5) zu drehen, und
       ein Andruckelement (2, 20) zum Andrücken des Papiers (13), das nach dem Bedrucken von der Oberseite der Schreibwalze (5) abgeführt wird, an die Rolle (1),
       wobei die Rolle auf der Traktorseite einer eine Tangente an der Schreibwalze (5) an der Druckstelle bildenden Linie liegt, und
       Führungsmittel (12, 20) zwischen der Druckstelle und der Rolle (1) zur Führung des Papiers zu der Rolle vorgesehen sind.
  2. Vorrichtung nach Anspruch 1, bei der das Andruckelement (2) zwei Andruckelementteile umfaßt, die an beiden Enden der Rolle (1) in deren Axialrichtung angeordnet sind und die Rolle (1) in einer Richtung senkrecht zur Achse der Rolle (1) überlappen.
  3. Vorrichtung nach Anspruch 2, bei der jedes Andruckelementteil (2) eine Hilfsrolle umfaßt.
  4. Vorrichtung nach Anspruch 2, bei der das Andruckelement eine Papierführungsabdeckung (20) umfaßt, die einen Rippenabschnitt (20b) aufweist, der die Andruckelementteile bildet.
  5. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Führungsmittel (12) einen Papierhalter umfassen, der zwischen einer Papierführungsposition und einer Papiernichtführungsposition umschaltbar ist, und der in seiner Papierführungsposition von der Schreibwalze (5) beabstandet ist.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Rolle (1) und das Andruckelement (2, 20) Teile einer abnehmbar an einem Rahmen des Druckers montierten Einheit sind.
  7. Vorrichtung nach Anspruch 5 und 6, bei der der Papierhalter (12) die Schreibwalze (5) in seiner Papierführungsposition kontaktiert, wenn die Einheit abgenommen ist, und bei dem Mittel (26) vorgesehen sind, um den Papierhalter in seiner Papierführungsposition von der Schreibwalze (5) beabstandet zu halten, wenn die Einheit an dem Drucker montiert ist.
EP19880110230 1987-06-30 1988-06-27 Papierzuführvorrichtung für Drucker Expired - Lifetime EP0297486B1 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP62163495A JPH0811461B2 (ja) 1987-06-30 1987-06-30 プリンタの紙送り機構
JP16349687A JPS648066A (en) 1987-06-30 1987-06-30 Printing paper cuing position controller for printer
JP163495/87 1987-06-30
JP163496/87 1987-06-30
JP17640487A JP2681932B2 (ja) 1987-07-15 1987-07-15 プリンタの紙押え装置
JP176404/87 1987-07-15
JP176405/87 1987-07-15
JP62176405A JP2689430B2 (ja) 1987-07-15 1987-07-15 プリンタの紙押え装置

Publications (3)

Publication Number Publication Date
EP0297486A2 EP0297486A2 (de) 1989-01-04
EP0297486A3 EP0297486A3 (en) 1990-02-28
EP0297486B1 true EP0297486B1 (de) 1993-09-08

Family

ID=27473869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880110230 Expired - Lifetime EP0297486B1 (de) 1987-06-30 1988-06-27 Papierzuführvorrichtung für Drucker

Country Status (3)

Country Link
EP (1) EP0297486B1 (de)
DE (1) DE3883872T2 (de)
HK (1) HK72295A (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4957379A (en) * 1989-01-11 1990-09-18 Monarch Marking Systems, Inc. Printing apparatus
FR2647055A1 (fr) * 1989-01-11 1990-11-23 Monarch Marking Systems Inc Appareil d'impression d'etiquettes
JPH02215561A (ja) * 1989-02-16 1990-08-28 Mitsubishi Electric Corp サーマルプリンタ
US5346322A (en) * 1989-04-24 1994-09-13 Brother Kogyo Kabushiki Kaisha Printing device having paper feed control
GB2232640B (en) * 1989-04-24 1993-06-30 Brother Ind Ltd Printing device with means for setting print start position on continuous stationery
DE3939506A1 (de) * 1989-05-22 1990-11-29 Mannesmann Ag Einrichtung fuer den papiertransport in druckern, insbesondere in matrixdruckern
US5129748A (en) * 1989-11-13 1992-07-14 Eastman Kodak Company Compact printer having sheet and tractor media selections
DE3939507C1 (de) * 1989-11-27 1991-02-21 Mannesmann Ag, 4000 Duesseldorf, De
JPH049752U (de) * 1990-05-17 1992-01-28
JP2959259B2 (ja) * 1991-05-27 1999-10-06 セイコーエプソン株式会社 印字装置
JP3397575B2 (ja) * 1996-03-29 2003-04-14 キヤノン株式会社 画像記録装置
FR2778870B1 (fr) * 1998-05-20 2000-06-23 Sagem Imprimante de terminal de traitement de donnees

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360279A (en) * 1980-07-02 1982-11-23 Brother Kogyo Kabushiki Kaisha Printing paper feeding mechanism
DE3585546D1 (de) * 1984-01-25 1992-04-16 Tokyo Electric Co Ltd Anordnung zur papierzufuhr fuer einen drucker.
SE447224B (sv) * 1985-03-20 1986-11-03 Ericsson Telefon Ab L M Pappersmatningsanordning for en skrivare
JPS61263537A (ja) * 1985-05-15 1986-11-21 Oki Electric Ind Co Ltd 自動給紙装置の紙送り制御方式

Also Published As

Publication number Publication date
EP0297486A3 (en) 1990-02-28
DE3883872D1 (de) 1993-10-14
EP0297486A2 (de) 1989-01-04
HK72295A (en) 1995-05-19
DE3883872T2 (de) 1994-02-10

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