EP0433022B1 - Drucker mit verbessertem Mechanismus zum Verhindern von Schrägeinzug des Papiers - Google Patents

Drucker mit verbessertem Mechanismus zum Verhindern von Schrägeinzug des Papiers Download PDF

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Publication number
EP0433022B1
EP0433022B1 EP19900313455 EP90313455A EP0433022B1 EP 0433022 B1 EP0433022 B1 EP 0433022B1 EP 19900313455 EP19900313455 EP 19900313455 EP 90313455 A EP90313455 A EP 90313455A EP 0433022 B1 EP0433022 B1 EP 0433022B1
Authority
EP
European Patent Office
Prior art keywords
printer
media
platen
paper
roller
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
EP19900313455
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English (en)
French (fr)
Other versions
EP0433022A1 (de
Inventor
Allan G. Olson
William R. Huseby
Steve O. Rasmussen
Vance M. Stephens
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.)
HP Inc
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Hewlett Packard Co
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Filing date
Publication date
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0433022A1 publication Critical patent/EP0433022A1/de
Application granted granted Critical
Publication of EP0433022B1 publication Critical patent/EP0433022B1/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
    • 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
    • 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
    • B41J13/26—Registering devices
    • B41J13/30—Side lays or gauges

Definitions

  • This invention relates to a printer with improved anti-skew performance and, more particularly, to a printer which reduces paper skew by insuring alignment while paper is fed through the printer both before and during printing.
  • Printers mark images on a medium. To achieve acceptable quality in output, the printed image must be properly aligned on the medium, and as a consequence, printers are designed with anti-skew mechanisms to insure such alignment.
  • Skew is an oblique course or a deviation from a predetermined straight line. For example, as paper is fed through a printer, it may buckle or twist. If an image is then printed, it will be skewed.
  • Skew can be caused by many factors. For instance, a printer may feed paper irregularly--driving one side more than the other, with the outcome that different lines of the printed image will not be parallel. Additionally, when paper is initially fed into a printer, it may not be properly aligned. If so, the image will be incorrectly positioned on the page. Often, as paper is fed through a printer, the paper is forced to make a significant turn. Because the paper resists turns, it may move away from the drive mechanism and cause a skewed print image. Variations in parts, media and product handling may also cause skew.
  • Hewlett-Packard's DeskJet® printer is an example of a printer with effective anti-skew features.
  • This invention offers a printer featuring significantly improved anti-skew design.
  • a printer with improved anti-skew performance comprising a housing having a print zone, a platen for print media and a drive mechanism including a drive roller for feeding print media from the platen into the housing, characterised in that a moveable member is mounted on the platen by an attachment which allows the moveable member to rock slightly relative to the platen about an axis substantially parallel to the direction in which print media is fed across the platen, in order to promote simultaneous gripping of a sheet of print media on its opposite lateral sides.
  • Figure 1 is a top perspective view of a printer constructed according to the present invention.
  • Figure 2 is a top view of a pressure plate, wrapper, media edge contactor, and back-out restraint constructed according to the invention, and included in the printer of Figure 1.
  • Figure 3 is an exploded, top perspective view of the pressure plate shown in Figure 2.
  • Figure 4 is an exploded perspective view of the pressure plate shown in Figure 2, showing the top of a platen and the bottom of a moveable member that make up the plate.
  • Figure 5 is a bottom view of the pressure plate shown in Figure 2.
  • Figure 6 is a simplified cross-sectional view of the printer of Figure 1, taken generally along line 6-6 in Fig. 2, and rotated 90° clockwise.
  • Figure 7 is similar to Figure 6, differing in that it shows the beginning of a paper feed cycle.
  • Figure 8 similar to Figure 6, shows the path the paper follows in the printer.
  • Figure 9 is a perspective view of a wrapper (isolated from other structure) constructed according to the invention.
  • Figure 10 is a perspective view of the wrapper in a mount.
  • Figure 11 is a simplified, side cross-sectional view of the wrapper shown in Figure 10, taken generally in the plane which exposes drive roller 26 b in Fig. 6.
  • Figures 12-14, inclusive, show different views of a media edge contacter constructed according to the invention.
  • Figure 15 is a view like that presented in Figure 1, with a portion of the printer's housing shifted to expose a carriage guide included in the printer.
  • Figure 16 is a simplified and enlarged cross-sectional view of the carriage guide, taken generally in the region, and direction, of the arrow in Fig. 15, disclosing support mounts provided for the guide.
  • Figure 17 is a bottom view of a back-out restraint.
  • Printer 20 includes a housing 21 having, among other things, flanges such as those shown at 22, a lower paper tray 23, and a paper back-out restraint 24.
  • a stack of sheet print media (not shown) on which printer 20 will print (typically paper) is loaded into tray 23. After printing, the paper is collected in an upper paper tray 25 (shown fragmentally in Fig. 1) resting on flanges 22 and located immediately above tray 23.
  • the paper-drive mechanism incorporated in printer 20 includes drive rollers 26 a , 26 b , 26 c. These rollers contact the top sheet of paper in tray 23 and drive it through a print zone Z, located generally inside the upper portion of housing 21 as seen in Fig. 1, and into upper tray 25.
  • the drive rollers are driven by any known method.
  • Figure 1 also shows components of several of the invented anti-skew mechanisms and their positions within the printer. Included are a pressure plate 27, a media edge contacter 28, and back-out restraint 24. These mechanisms also include a wrapper 29 (see Figs. 9 and 10) and a carriage guide support, or support means, 30 (see Fig. 16). Each of these structures will be discussed in turn. Plate 27, edge contacter 28, and wrapper 29 together form what is referred to herein as media alignment means. The media edge contacter, along with back-out restraint 24 and lower tray 23 together make up a supply means generally pointed to in Fig. 1 by arrow 31.
  • Plate 27 includes a platen 32 connected to printer 20 by hinges 33, and taking the form generally of a rectangular piece of aluminum.
  • the top surface of platen 32 includes a recessed area 34.
  • a relatively moveable member 35 is attached to platen 32 and includes two, laterally spaced projections 36 and 37. These projections may be made of cork. Additionally, member 35 includes a sloped, lead-in surface 38. The attachment between platen 32 and member 35 is what might be thought of as a limited wobble attachment which allows the moveable member to rock slightly relative to the plate about an axis shown generally at 39.
  • FIG. 6 illustrates the waiting-to-be-picked situation with a stack of paper residing in proper position in lower tray 23 with the downstream or lead edges of the stack resting on projections 36, 37 beneath rollers 26 a , 26 b , 26 c , which are rotating in the direction of the curved arrow in Fig. 6.
  • Fig. 8 illustrates a subsequent stage wherein the pressure plate has been re-lowered, and the paper which was picked in Fig. 7, is on its way into the paper path, toward and through the printing zone in the printer.
  • wrapper 29 is illustrated.
  • Wrapper 29, illustrated in freestanding form in Fig. 9 is formed preferably of a thin sheet of specially bent springy metal having the nominal configuration illustrated in this figure.
  • the wrapper is a singular unit employed centrally (in a lateral sense) in the printer. It occupies a location immediately adjacent central drive roller 26 b .
  • wrapper 29 is shown snap-seated in a suitable socket provided in a structural mount 42 which is formed in any suitable manner in the usual chassis structure which forms part of printer 20.
  • Wrapper 29 includes a curved arm 29 a which is intended to curl adjacent drive roller 26 b , as seen in Fig. 11, and to urge and hold paper against the drive roller.
  • the wrapper, and more particularly the wrapper's arm functions the same tends to direct paper precisely into the nip region which exists, as shown in Fig. 11, between drive roller 26 b and a pinch roller 44.
  • the edge contacter takes the form of an elongate structure which is long in the direction that it extends along the side of a stack of paper contained in lower tray 23. As can be seen in Fig. 2, this edge contacter lies substantially along the length of the side of pressure plate 27.
  • Edge contacter 28 which may preferably be a molded plastic part, includes an elongate pad face 28 a , which provides for surface/edge contact with paper in a stack, joining with a flange lead-in surface 28 b .
  • Edge contacter 28 sits in a relatively moveable but captured condition in a mount 46 which allows for limited angulation and reciprocation of the contacter relative to the mount, as indicated generally by the overhead pair of double-ended arrows. Biasing the edge contacter away from mount 46, the condition in which it is shown in Fig. 12, is a biasing spring 48 which acts between the mount and the contacter, located toward the lead end of the contacter (which condition is apparent from the opened-up top view illustrated in Fig. 13).
  • lead-in surface 28 b facilitates feeding in of a stack of paper
  • pad face 28 a functions, as now will be more particularly explained, to urge the stack of paper laterally toward an appropriate held condition against opposing support guide walls, shown at 50, 52 on the right side of Fig. 2.
  • pad face 28 a has an almost imperceptible incline, sloping upwardly and to the right in the figure, at an angle of around 87° to the normal. This results in assuring that those sheets of paper which are at the top of the stack in tray 23 are pre-aligned against the guide walls, in a proper position for guidance into the feed path following picking by the rollers.
  • biasing spring 48 along the length of the contacter, and more specifically toward the infeed end of the contacter, vis-a-vis the way in which paper is inserted into the tray, assures good control over what might be thought of as rear end fishtailing of a sheet of paper as the same as pulled into the paper feed path.
  • the edge contacter plays a multi-functional role in dealing with the problem of skew, which role is enhanced by the relative positions and sizes of its active faces 28 a 28 b , the inclination, in a vertical sense, of face 28 a and the near endo biasing position for action of spring 48.
  • print zone Z is again illustrated. Included within this zone are a printhead cartridge 54, a printhead carriage 56 and a carriage guide 58. Cartridge 54 moves back and forth in carriage 56, along guide 58, and prints on paper traveling thorough the print zone.
  • carriage guide support, or support means, 30, which includes three cooperating components illustrated at 30 a , 30 b , 30 c .
  • Component 30 a takes the form of a horizontal support pad which defines a fixed vertical support datum plane for the left free end of the carriage guide as seen in Fig. 16--allowing the guide to slide from left to right in Fig. 16, but not to change, in a lowering sense, its elevation.
  • Component 30 b takes the form of a molded boss with a threaded screw hole underlying the carriage guide, in alignment with a clearance hole in the guide through which a securing screw, such as that shown in upwardly exploded condition at 60, is fastened.
  • Component 30 b includes a step in its upper surface which serves to force the carriage guide against component 30 a when screw 60 secures the carriage guide.
  • Component 30 c acts as a stabilizing key, by fitting into a lateral notch 62 formed in the carriage guide. This cooperative interaction prevents the carriage guide in its entirety from shifting to the left or the right in Fig. 16.
  • the upper horizontal surface of support component 30 a functions herein as a first horizontal support surface.
  • Component 30 c acts herein as a second support. Similar support means may be included at the right end, as seen in Fig. 15, of guide 58.
  • the support means 30, functions to reduce printhead carriage rocking and to provide tolerance for imperfections or warping in the carriage guide. As the printhead carriage moves back and forth on the guide, the printhead is held a certain distance from the paper. Support means 30 helps maintain the position of the printhead relative to the paper.
  • Fig. 17 shows a bottom side perspective view of previously mentioned back-out restraint 24.
  • Restraint 24 is intended to counter this tendency, and yet not to be a hinderance to the insertion of paper into the tray when loading is necessary. Enabling this all to occur in a very simple structure is a leaf spring shown at 64 mounted on the underside of the restraint (the upper side in Fig. 17). Spring 64 allows for frictional sliding contact with tray 23.
  • the invented printer with improved anti-skew performance is applicable to many printing systems. It provides a low-cost manner of preventing skew. While the best mode and preferred embodiment of the invention have been described, variations and changes may be made without departing from the scope of the invention.

Landscapes

  • Handling Of Cut Paper (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Claims (8)

  1. Ein Drucker mit verbessertem Anti-Schrägeinzugverhalten, der ein Gehäuse (21) mit einer Druckzone (Z), eine Auflageplatte (32) für Druckmedien und einen Antriebsmechanismus, der eine Antriebswalze (26a, 26b, 26c) zum Zuführen der Druckmedien von der Auflageplatte (32) in das Gehäuse (21) einschließt, umfaßt, dadurch gekennzeichnet,
    daß ein bewegliches Bauglied (35) auf der Auflageplatte (32) durch eine Befestigung befestigt ist, die es dem beweglichen Bauglied (35) ermöglicht, sich relativ zu der Auflageplatte (32) um eine Achse (39), die im wesentlichen parallel zu der Richtung ist, in der die Druckmedien über die Auflageplatte zugeführt werden, geringfügig hin- und herzubewegen, um das gleichzeitige Erfassen eines Blattes des Druckmediums auf seinen gegenüberliegenden lateralen Seiten zu unterstützen.
  2. Ein Drucker gemäß Anspruch 1, dadurch gekennzeichnet,
    daß ein Schacht (23) für die Druckmedien vorgesehen ist, und daß die Auflageplatte (32) drehbar ist und zwischen dem Schacht (23) und der Antriebswalze befestigt ist.
  3. Ein Drucker (20) gemäß Anspruch 1 oder 2, dadurch gekennzeichnet,
    daß die Auflageplatte (32) einen ausgesparten Bereich (34) hat und daß das bewegliche Bauglied (35) zwei erhöhte Vorsprünge (36, 37) einschließt, die auf dem Bauglied (35) lateral beabstandet sind.
  4. Ein Drucker (20) gemäß Anspruch 1, 2 oder 3, dadurch gekennzeichnet,
    daß die Medienausrichtungseinrichtung ferner eine Führungsvorrichtung (29) einschließt, die um einen Abschnitt der Walze (26b) gekrümmt ist.
  5. Ein Drucker (20) gemäß Anspruch 4, dadurch gekennzeichnet,
    daß die Führungsvorrichtung (29) die Walze (26b) an einem Punkt berührt.
  6. Ein Drucker (20) gemäß Anspruch 4 oder 5, dadurch gekennzeichnet,
    daß die Führungsvorrichtung (29) durch eine Feder vorgespannt ist, um an einem Punkt gegen die Walze (26b) gedrückt zu werden.
  7. Ein Drucker (20) gemäß irgendeinem der Ansprüche 4 bis 6, dadurch gekennzeichnet,
    daß die Führungsvorrichtung (29) einen Arm (29a) einschließt, der auf einer Basis (42) befestigt ist und der sich in Richtung der Walze (26b) eindreht und die Walze (26b) in einem Punkt berührt.
  8. Ein Drucker (20) gemäß irgendeinem der Ansprüche 1 bis 7, dadurch gekennzeichnet,
    daß die Medienausrichtungs-Einrichtung ferner eine Vorrichtung zur Kontaktierung der Kanten der Medien (28) mit einer Fläche (28a), die gegen solche Medien drückt, ein Befestigungsteil (46) und eine Feder (48) einschlieβt, die zwischen dem Befestigungsteil (46) und der Fläche (28a) angebracht ist, um die Fläche (28a) in Richtung der Medien vorzuspannen, wobei die Feder (48) mit der Fläche (28a) auf eine solche Art verbunden ist, daß die Fläche (28a) der lateralen Verschiebung von solchen Medien mit einer größeren Kraft an einem ersten Punkt widersteht als an einem zweiten Punkt.
EP19900313455 1989-12-14 1990-12-11 Drucker mit verbessertem Mechanismus zum Verhindern von Schrägeinzug des Papiers Expired - Lifetime EP0433022B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45128689A 1989-12-14 1989-12-14
US451286 1989-12-14

Publications (2)

Publication Number Publication Date
EP0433022A1 EP0433022A1 (de) 1991-06-19
EP0433022B1 true EP0433022B1 (de) 1994-07-06

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Application Number Title Priority Date Filing Date
EP19900313455 Expired - Lifetime EP0433022B1 (de) 1989-12-14 1990-12-11 Drucker mit verbessertem Mechanismus zum Verhindern von Schrägeinzug des Papiers

Country Status (4)

Country Link
EP (1) EP0433022B1 (de)
JP (1) JPH06199447A (de)
DE (1) DE69010468T2 (de)
SG (1) SG3195G (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10202964A (ja) * 1996-11-21 1998-08-04 Fuji Photo Film Co Ltd カラーサーマルプリント方法及びプリンタ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808262A (en) * 1953-11-16 1957-10-01 Fixture Hardware Corp Feed tray side guide lock for duplicating machines
DE2829827C2 (de) * 1978-07-07 1986-04-10 Olympia Werke Ag, 2940 Wilhelmshaven Führungseinrichtung für Aufzeichnungsträger bei Druckwerken
DE2946033C2 (de) * 1979-11-14 1982-08-19 Siemens AG, 1000 Berlin und 8000 München Papiereinzugsvorrichtung für Druckeinrichtungen
JPS6366032A (ja) * 1986-09-08 1988-03-24 Ricoh Co Ltd プリンタの自動給紙装置

Also Published As

Publication number Publication date
DE69010468D1 (de) 1994-08-11
SG3195G (en) 1995-06-16
JPH06199447A (ja) 1994-07-19
EP0433022A1 (de) 1991-06-19
DE69010468T2 (de) 1994-10-27

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