EP0026890A2 - Mécanisme d'avance pour feuilles de papier dans une imprimante - Google Patents

Mécanisme d'avance pour feuilles de papier dans une imprimante Download PDF

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Publication number
EP0026890A2
EP0026890A2 EP80105861A EP80105861A EP0026890A2 EP 0026890 A2 EP0026890 A2 EP 0026890A2 EP 80105861 A EP80105861 A EP 80105861A EP 80105861 A EP80105861 A EP 80105861A EP 0026890 A2 EP0026890 A2 EP 0026890A2
Authority
EP
European Patent Office
Prior art keywords
entrance
axle
paper
platen
printer
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Withdrawn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
EP80105861A
Other languages
German (de)
English (en)
Other versions
EP0026890A3 (fr
Inventor
Werner Jung
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.)
AT&T Teletype Corp
Original Assignee
Teletype 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 Teletype Corp filed Critical Teletype Corp
Publication of EP0026890A2 publication Critical patent/EP0026890A2/fr
Publication of EP0026890A3 publication Critical patent/EP0026890A3/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Withdrawn legal-status Critical Current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
    • 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
    • B41J13/036—Rollers co-operating with a roller platen
    • B41J13/048—Front and rear rollers both mounted on a common carrier
    • 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
    • B41J11/50—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 in which two or more papers or sets are separately fed in the same direction towards the printing position

Definitions

  • This invention relates to a paper drive mechanism for a printer which will accommodate various modes of paper insertion.
  • printer generally identifies an apparatus which responds to incoming data signals by printing alpha-numeric characters upon a sheet of paper as the paper is fed through a print station.
  • Printers often provide alternate modes of paper insertion depending upon the form of the paper being used.
  • the paper is supplied as a continuous sheet with consecutive segments joined at a perforation line.
  • the paper is supplied fan-folded in a box which is placed under or to the rear of a pedestal supporting the printer and the paper feeds through the bottom or rear of the printer.
  • single sheets may be operator fed into the printer from the top in a manner similar to that used in a conventional typewriter.
  • the paper drive mechanism generally consists of a motor driven platen with a plurality of guide rollers spring biased against the platen.
  • the guide rollers are positioned along the path of the paper through the printer.
  • Paper advance is then solely dependent upon frictional drive from the platen.
  • the initial angle which the plane of the paper makes with respect to a tangent to the surface of the platen at the point of initial contact is dependent on the mode of paper feed. It has been found that the reliability of initial paper feed varies with this angle.
  • Prior drive mechanisms optimized for feed from the rear of the printer will often exhibit erratic feed when paper is fed from the top of the printer with the converse also being true.
  • the hereinafter described embodiment provides a paper drive mechanism for a printer which exhibits reliable paper feed for all paper widths which the printer will accommodate regardless of the mode of paper entry.
  • a printer including a rotatably driven platen, is provided with a mechanism for advancing paper sheets through the printer.
  • An entrance axle has firmly affixed thereto an entrance roller.
  • the entrance axle is biased toward the platen with the entrance roller positioned in the path of the paper through the printer.
  • a drive roller is affixed to the entrance axle and biased along with the entrance roller toward the surface of the platen. The drive roller serves to rotatably drive the entrance roller through the entrance axle.
  • the drive roller is positioned out of the path of the maximum width paper which the printer will accommodate so that for all paper widths the paper will be advanced through the printer by the platen and the entrance roller, which is driven by the platen through the entrance axle and by the drive roller which is maintained in frictional driving contact with the platen.
  • An additional aspect of this invention is that the entrance axle is supported by a pair of spaced pivotably supported support arms. Means are included for biasing the arms about their pivots so as to urge the entrance and drive rollers toward the platen. Means are additionally included for selectively positioning the ends of the pair of support arms away from the platen and against the bias of the biasing means. Further, the ends of the entrance roller axle are rotatably journaled in a pair of elongated rocker arms each of which is rotatably fixed to one of the support arms for rotational movement with respect thereto. An exit axle is rotatably supported by the remaining ends of the rocker arms. The exit axle carries at least one exit .roller for directing the paper to the print station of the printer. More particularly, a positioning means in the form of a shaft having at least one elongated flattened surface is located adjacent the pair of support arms so that when the shaft is rotated, one longitudinal edge of the flattened surface will move the entrance axle away from the platen.
  • a portion of a printer 8 which includes a print mechanism 10 establishing a print station 12 and a pair of paper drive assemblies 14 and 16 cooperating with a platen 18 for driving paper 17 or 19 through the print station 12.
  • the print mechanism 10 includes a print head carriage 20 traversing the paper 17, 19 at the print station 12.
  • the printer carriage 20 carries a matrix wire print head 24 which prints alpha-numeric indicia on the paper 17, 19 in accordance with incoming signal commands as the carriage 20 traverses the paper 17, 19.
  • a suitable matrix print head 24 is described in U. S. Patent No. 3,973,661 issued to J. L. DeBoo et al. on August 10, 1976 and entitled “Wire-Matrix Printers, and Electromagnetic Actuator Mechanisms Useful In Such Printers" and in U. S. Patent No. 3,982,622 issued to J. A. Bellino et al. on September 28, 1976 and entitled "Actuator Mechanism For Wire Matrix Printers".
  • the printer 8 includes a rectangular paper tray 26 which is concave at one end (FIG. 2) to accommodate the curvature of the platen 18. Serving to guide the paper during the single sheet mode is a paper guide 27.
  • the frame of the printer 8 includes an upwardly projecting wall 28 having four spaced slots 30, 32, 34 and 36 for receiving four drive roller support arms 38, 40, 42 and 44.
  • Each of the support arms 38, 40, 42 and 44 has a notch which seats in its respective slot thus restricting lateral movement of the support arms.
  • the upwardly disposed edge of each slot 30; 32, 34 and 36 serves as a fulcrum for the support arms 38, 40, 42, 44 seated therein.
  • the wall 28 has two right angle bends 46 and 48 and located at the bend 48 are four spaced holes each receiving one end of a coil spring 50, 52 54 and 56.
  • the remaining end of each coil spring 50, 52, 54, 56 is hooked over one end of its respective support arm 38, 40, 42, 44 and biases the support arm in a counter-clockwise direction as viewed in FIG. 2.
  • a drive roller release 60 includes a rod 62 having a square cross-section throughout that portion adjacent the support arms 38, 40, 42 and 44 and the rod is round in cross-section at its ends and center.
  • the ends of the rod are journaled in circular openings defined by end plates 64 and 66 with one end of the rod 62 having secured thereto a lever 68 which facilitates manual rotation of the rod 62.
  • the center of the rod 62 rests against a ledge 70 mounted to the wall 28.
  • the support arms 38, 40, 42 and 44 are associated in pairs 38-40 and 42-44. Since the paper drive assemblies 14 and 16 are similarly constructed, only one will be considered in detail with similar components of the remaining assembly designated with the same reference numeral and the subscript "a".
  • the paper drive assembly 16 includes right and left rocker arms 72 and 74. The center of each of the rocker arms 72, 74 is mounted to the end of its respective support arm 42, 44 and freely pivots with respect thereto. Each end of each of the rocker arms 72, 74 is enlarged and defines a circular opening.
  • an exit roller axle 76 carrying three exit rollers 78, 80, 82 which, under bias, serve to force the paper against the platen 18 as the paper 17, 19 passes through the print station 12.
  • an entrance roller axle 86 carrying two entrance rollers 88 and 90, secured to and rotatable with the axle 86.
  • the entrance rollers 88 and 90 are slightly larger in diameter than the exit rollers thus providing a relatively large frictional drive coefficient with the paper 19.
  • the entrance roller axle 86 extends beyond the rocker arm as at 92 and outside of the path of the maximum width paper 17, 19 the printer will accommodate as the paper passes through the printer 8.
  • the axle extension 92 has fixed thereto a drive roller 94 constructed of suitable material having a high frictional coefficient with the surface of the platen 18. It should be noted that the drive roller 94 is positioned completely out of the path of the maximum paper width the printer will accommodate so that for all paper widths, the drive roller 94 will be in continuous contact with the platen 18 thus maintaining continuous drive of the entrance rollers 88 and 90 through the axle 86 for all paper widths.
  • the entrance rollers 88 and 90 on the entrance axle 86 will rotate with the drive roller 94 so that the paper is continuously driven not only by the platen 18 but also by the entry rollers 88 and 90. Due to a loose fit at the pivoted supports of the rocker arms 72, 74 to the support arms 42, 44 as well as the relatively loose fit between the entry and exit axles, 76, 86 and the rocker arms 42, 44, the entire roller assembly has a large degree of positional freedom and adjusts to the contour of the platen. This feature assures positive contact of the drive roller 94 with the platen and the entrance rollers 88 and 90 with the paper. As illustrated, the axle 86 supporting the entrance rollers is greater in diameter and heavier than the exit axle 76.
  • the rocker arm 72, 74 will rest with the axle extensions 92 abutting the upper edge of the support arm 74.
  • This rest position of the assembly 16 facilitates reinstalla- tion of the platen since the drive assmebly 16 will rest in approximately its assembled position.
  • the support arms 42, 44 move away from the platen withdrawing the rollers 88, 90, 94, 78, 80 and 82 from the platen 18. Due to the weight of the entrance axle 86, the rocker arms pivot about their supports and the exit rollers 78, 80 and 82 rest against the platen. This arrangement assures that the assembly 16 will not interfere with the movement of the carriage 20.
  • the selected mode of paper entry is along the paper tray as shown by the directional arrow 96.
  • the paper 17 is placed on the tray 26 and manually pushed toward the platen 18 until the edge of the paper 17 strikes the rotating platen 18 and entrance rollers 88 and 90.
  • the entrance rollers 88 and 90 ride upon the paper 17, prior mechanisms often experience erratic paper feed since the frictional coefficient between the paper 17 and platen 18, which is the main force advancing the paper, is insufficient to achieve reliable paper feed.
  • the entrance axle 86 extends beyond the rocker arm 74 well out of the path of the maximum width paper the printer will accommodate so that the drive roller 94 is always maintained in continuous driving engagement with the platen 18 throughout the paper feed process for all usable paper widths.
  • the entrance rollers 88 and 90 are lifted from the platen 18 by the paper 17 they are driven by the drive roller 94 and thus the paper 17 is continuously driven by both the platen 18 and the entrance rollers 88 and 90.
  • a single sheet of paper 19 may be inserted from the top of the printer 8 along the guide 27 with the leading edge of the paper 19 sliding down the guide 27 in the direction of the arrow 98 and engaging the platen 18 and the entrance rollers 88 and 90.
  • the driving force of the platen 18 on the paper 19 is greater with this mode of entry since the plane of:the paper 19 is approximately along a tangent to the platen 18 at the point of contact therewith.
  • both the rotating platen 18 and the driven entrance rollers 88 and 90 drive the paper 19.
  • Reliable paper drive for all paper widths is assured in either paper mode selected since both the platen 18 and the-entrance rollers 88, 90 continuously drive the paper 19.
  • the operator may desire to align the paper 17 or 19 at the print station 12.
  • the operator rotates the handle 16.clockwise in the direction of the arrows 100 of FIG. 2 thus rotating the shaft 62 causing the support arms 38, 40, 42, 44 to deflect downwardly as they ride along the edge of the shaft 62.
  • the arms 38, 40, 42, 44 move downwardly, the frictional coefficient between the paper 17 or 19 and the drive assembly rollers and the platen is reduced thus allowing convenient manual rep6sitioning of the paper 17 or 19 at the print station 12.
  • the weight of the entrance axle 86 pivots the arms 72, 74 so that the rollers 78, 80 and 82 loosely rest against the platen out of the path of the carriage 20.
  • the handle 68 is returned to its original location and the rollers 78, 80, 82, 88 and 90 again rest against the paper.

Landscapes

  • Handling Of Sheets (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)
  • Handling Of Cut Paper (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP80105861A 1979-10-09 1980-09-27 Mécanisme d'avance pour feuilles de papier dans une imprimante Withdrawn EP0026890A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8313279A 1979-10-09 1979-10-09
US83132 2002-02-27

Publications (2)

Publication Number Publication Date
EP0026890A2 true EP0026890A2 (fr) 1981-04-15
EP0026890A3 EP0026890A3 (fr) 1982-10-20

Family

ID=22176394

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105861A Withdrawn EP0026890A3 (fr) 1979-10-09 1980-09-27 Mécanisme d'avance pour feuilles de papier dans une imprimante

Country Status (2)

Country Link
EP (1) EP0026890A3 (fr)
JP (1) JPS5660281A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2542254A1 (en) * 1983-03-10 1984-09-14 Sagem Removable pressure roller system for printing machine
FR2562475A2 (fr) * 1983-03-10 1985-10-11 Sagem Systeme de galet presseur ecartable pour machine imprimante ou analogue
EP0310731A1 (fr) * 1987-10-08 1989-04-12 MANNESMANN Aktiengesellschaft Dispositif d'avance de support d'information pour imprimante matricielle
EP0358192A3 (en) * 1988-09-06 1990-07-18 Seiko Epson Corporation Sheet feeding device in a printer
EP0383332A3 (fr) * 1989-02-15 1991-04-24 Tokyo Electric Co., Ltd. Transporteur de feuilles pour une imprimante
WO1993021016A1 (fr) * 1992-04-16 1993-10-28 International Business Machines Corporation Mecanisme d'avance pour supports a deplacer
FR2713989A1 (fr) * 1993-12-21 1995-06-23 Nipson Imprimante à haute cadence d'impression et utilisations d'une telle imprimante.
WO1998033652A1 (fr) * 1997-01-30 1998-08-06 Imperial Chemical Industries Plc Imprimante a transfert thermique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS595348U (ja) * 1982-06-30 1984-01-13 アルプス電気株式会社 記録装置における紙送り機構
JPS6032684A (ja) * 1983-08-01 1985-02-19 Matsushita Electric Ind Co Ltd 給紙装置
JPS6225559U (fr) * 1985-07-31 1987-02-17

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2124877A1 (de) * 1971-05-19 1972-12-07 Zentronik Veb K Papierführungsvorrichtung für Schreib- und ähnliche Büromaschinen
JPS533611B2 (fr) * 1973-01-22 1978-02-08
JPS5350974Y2 (fr) * 1974-07-26 1978-12-06
JPS5249617A (en) * 1975-10-16 1977-04-20 Mitsui Constr Construction method by means of intermediate and high story wall system precast concrete construction
US4134695A (en) * 1977-07-13 1979-01-16 Teletype Corporation Printer carriage
DE2734041C2 (de) * 1977-07-28 1979-05-31 Olympia Werke Ag, 2940 Wilhelmshaven Papierführung für ein Tintenspritz-Druckwerk

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562475A2 (fr) * 1983-03-10 1985-10-11 Sagem Systeme de galet presseur ecartable pour machine imprimante ou analogue
FR2542254A1 (en) * 1983-03-10 1984-09-14 Sagem Removable pressure roller system for printing machine
EP0310731A1 (fr) * 1987-10-08 1989-04-12 MANNESMANN Aktiengesellschaft Dispositif d'avance de support d'information pour imprimante matricielle
EP0566159A3 (en) * 1988-09-06 1994-05-18 Seiko Epson Corp Sheet feeding device in a printer
EP0358192A3 (en) * 1988-09-06 1990-07-18 Seiko Epson Corporation Sheet feeding device in a printer
US5030024A (en) * 1988-09-06 1991-07-09 Seiko Epson Corporation Sheet feeding device in a printer
EP0383332A3 (fr) * 1989-02-15 1991-04-24 Tokyo Electric Co., Ltd. Transporteur de feuilles pour une imprimante
WO1993021016A1 (fr) * 1992-04-16 1993-10-28 International Business Machines Corporation Mecanisme d'avance pour supports a deplacer
FR2713989A1 (fr) * 1993-12-21 1995-06-23 Nipson Imprimante à haute cadence d'impression et utilisations d'une telle imprimante.
EP0659569A1 (fr) * 1993-12-21 1995-06-28 Nipson S.A. Imprimante à haute cadence d'impression et utilisations d'une telle imprimante
US6120142A (en) * 1993-12-21 2000-09-19 Nipson S.A. High-speed printer and the uses of such a printer
WO1998033652A1 (fr) * 1997-01-30 1998-08-06 Imperial Chemical Industries Plc Imprimante a transfert thermique
US6168324B1 (en) 1997-01-30 2001-01-02 Imperial Chemical Industries Plc Thermal transfer printer

Also Published As

Publication number Publication date
EP0026890A3 (fr) 1982-10-20
JPS5660281A (en) 1981-05-25

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Inventor name: JUNG, WERNER