WO2011143054A1 - Module d'entraînement de système de transport de support - Google Patents

Module d'entraînement de système de transport de support Download PDF

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Publication number
WO2011143054A1
WO2011143054A1 PCT/US2011/035458 US2011035458W WO2011143054A1 WO 2011143054 A1 WO2011143054 A1 WO 2011143054A1 US 2011035458 W US2011035458 W US 2011035458W WO 2011143054 A1 WO2011143054 A1 WO 2011143054A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
media
guide
module
web
Prior art date
Application number
PCT/US2011/035458
Other languages
English (en)
Inventor
Randy E. Armbruster
Bradley S. Bush
Thomas Niertit
Christopher M. Muir
Bradley C. Decook
Original Assignee
Eastman Kodak Company
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 Eastman Kodak Company filed Critical Eastman Kodak Company
Publication of WO2011143054A1 publication Critical patent/WO2011143054A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/32—Arrangements for turning or reversing webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/52—Auxiliary process performed during handling process for starting
    • B65H2301/522—Threading web into machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/15—Digital printing machines

Definitions

  • the present invention generally relates to a media transport system and more particularly relates to a mechanism for flipping the media while in motion in order to switch the relative orientation of top and bottom surfaces of the moving web media within the media transport system.
  • Continuous web printing allows economical, high-speed, high- volume print reproduction.
  • a continuous web of paper or other substrate material is fed past one or more printing subsystems that form images by applying one or more colorants onto the substrate surface.
  • Performance criteria for mechanical apparatus that handle paper or other print media traveling at high speeds throughout the printing process include efficiency and speed as well as the capability to maintain precise registration.
  • both surfaces of the web media are printed on.
  • the media transport system flips the print media over while in motion, in order to print onto the other surface of the web.
  • Subsystems that perform this function have been called turnover apparatus, turnbar apparatus, or "turnover modules", for example, and typically consist of an arrangement of fixed or moving rollers that direct and re-orient the moving web accordingly.
  • One difficulty with conventional turnover apparatus relates to initial feed of the print media by an operator when loading the machine for a print job.
  • Turnover apparatus often direct the media over a somewhat complex feed and guidance path, changing path direction a number of times in order to perform the flipping function.
  • This path typically extends around and between a number of rollers and fixed surfaces that are positioned at different angles and, because the turnover mechanism is often difficult to see and to access in the first place, it can be a cumbersome operation often requiring two people to accomplish. Time and training requirements for this operator function can be burdensome.
  • the capability to feed the leading edge of a print media roll through the media transport path quickly and accurately can translate to increased efficiency, reduced cost, and reduced likelihood of jams, dirt, and other problems for continuous web printing.
  • the present invention provides solutions for improving leading edge guidance through a continuous web media transport system and, in particular, through the media turnover mechanism of such a transport system.
  • a media transport system drive module includes a guide for directing the leading edge of the media through the turnover mechanism.
  • a media drive module includes a drive motor.
  • a roller around a portion of which a web of media wraps, is connected to the drive motor such that the roller is caused to rotate.
  • a guide is positioned to direct a leading edge of the web of media around the roller. The guide is movable between a first position adjacent to the roller to direct the leading edge of the web of media and a second position removed from the roller that provides access to at least a portion of the roller.
  • One advantage of the present invention is that it provides a measure of guidance for routing a media web along a travel path, around and between rollers, surfaces, and other components of the printing system. Another advantage of the present invention is that it provides media web guidance without adding constraint to media edges.
  • Figure 1 is a schematic side view of a digital printing system according to an example embodiment of the present invention.
  • Figure 2 is an enlarged schematic side view of media transport components of the digital printing system shown in Figure 1 ;
  • Figure 3 is a top schematic view showing the arrangement of rollers and surfaces in a turnover mechanism shown in Figure 2;
  • Figure 4 is a side view of digital printing system components according to an example embodiment of the invention.
  • Figure 5 is a perspective view of a prior art turnover mechanism showing media path directions
  • FIG. 6 is a perspective view of the turnover mechanism shown in Figures 3 and 4 showing guide positions between turn bars and the fixed drive roller;
  • Figure 7 is another perspective view of the turnover mechanism showing guide positions between turn bars and the fixed drive roller;
  • Figure 8 is a top view of the turnover mechanism showing guide positions
  • Figure 9 is a partial side view of a turnover mechanism showing components of a media drive module and guides according to an example embodiment of the invention.
  • Figure 10 is a plan view of a media guide that fits over a nip roller in the media drive module
  • Figure 11 is a side view of the media drive module showing a media guide in an operating position
  • Figure 12 is a side view of the media drive module showing the media guide in a loading position.
  • the method and apparatus of the present invention provide a guidance mechanism to improve leading edge feed of the web media through the set of rollers and drive mechanism of a turnover apparatus in a continuous web media transport apparatus.
  • the method and apparatus of the present invention provide a turnover apparatus in a digital printing system that transports continuously moving web print media past one or more digital printheads, such as inkjet printheads.
  • the apparatus and method of the present invention are particularly well suited for printing apparatus that provide non-contact application of ink or other colorant onto a continuously moving medium.
  • the printhead of the present invention selectively moistens at least some portion of the media as it courses through the printing system, but without the need to make contact with the print media.
  • continuous web of print media relates to a print media that is in the form of a continuous strip of media as it passes through the printing system from an entrance to an exit thereof.
  • the continuous web of print media itself serves as the receiving print medium to which one or more printing ink or inks or other coating liquids are applied in non- contact fashion. This is distinguished from various types of “continuous webs” or “belts” that are actually transport system components rather than receiving print media and that are typically used to transport a cut sheet medium in an
  • downstream are terms of art referring to relative positions along the transport path of a moving web; points on the web move from upstream to downstream.
  • a digital printing system 10 for continuous web printing according to a modular embodiment.
  • a first module 20 and a second module 40 are provided for guiding continuous web media that originates from a source roller 12. Following an initial slack loop 52, the media that is fed from source roller 12 is then directed through digital printing system 10, past one or more digital printheads 16 and supporting printing system 10 components.
  • First module 20 has a support structure, shown in more detail subsequently, that includes a cross-track positioning mechanism 22 for positioning the continuously moving web of print media in the cross-track direction, that is, orthogonal to the direction of travel and in the plane of travel.
  • cross-track positioning mechanism 22 is an edge guide for registering an edge of the moving media.
  • a tensioning mechanism 24, affixed to the support structure of first module 20, includes structure that sets the tension of the print media. Rollers and fixed surfaces A, B, C, D, E, F, G, and H guide the moving media through first module 20.
  • second module 40 Downstream from first module 20 along the path of the continuous web media, second module 40 also has a support structure, similar to the support structure for first module 20. Affixed to the support structure of either the first or second module 20 or 40 are one or more angular constraint structures 26, such as rollers, for setting an angular trajectory of the web media. Rollers I, J, K, L, M, N, O, and P guide the moving media through and out from second module 40.
  • printing system 10 also includes a turnover mechanism (TB) 30 that is configured to turn the media over, flipping it backside-up in order to allow printing on the reverse side.
  • the print media then leaves the digital printing system 10 and travels to a media receiving unit, in this case a take-up roll 18.
  • Take-up roll 18 is then formed from the re-wound printed web media.
  • the digital printing system can include a number of other
  • system components including multiple print heads and dryers, for example, as described in more detail subsequently.
  • Other examples of system components not described herein but common to such systems include web cleaners, web tension sensors, and quality control sensors.
  • Control logic for the respective digital printing system 10 monitors load cell signals at one or more locations and, in response, makes any needed adjustment in motor torque in order to maintain the proper level of tension throughout the system.
  • the pacing drive component of the printing apparatus is turnover mechanism TB 30.
  • load cell signals at roller D Figure 2 indicate tension of the web preceding turnover mechanism TB 30; similarly, load cell signals at roller J indicate web tension on the output side, between turnover mechanism TB 30 and take-up roll 18.
  • Control logic for the appropriate in- and out- feed driver rollers at B and N, respectively, can be provided by an external computer or processor, not shown in Figures of this application.
  • on-board control logic processor 90 such as a dedicated microprocessor or other logic circuit, can be used for maintaining control of web tension within each tension-setting mechanism and for controlling other machine operation and operator interface functions.
  • the tension in a module preceding turnover mechanism TB 30 and a module following turnover mechanism TB 30 can be independently controlled relative to each other, further enhancing the flexibility of the printing system.
  • the drive motor is included in turnover mechanism TB 30.
  • the drive motor need not be included in a turnover mechanism. Instead, the drive motor can be appropriately located along the web path so that tension within one module can be independently controlled relative to tension in another module.
  • Table 1 that follows identifies the lettered components used for web media transport and shown in Figure 2.
  • An edge guide against which the media is urged laterally so that an edge of the media contacts a stop, is provided at A.
  • the slack web entering the edge guide allows the print media to be shifted laterally without interference without being overconstrained.
  • An S-wrap device SW provides stationary curved surfaces over which the continuous web slides during transport. As the paper is pulled over these surfaces the friction of the paper across these surfaces produces tension in the print media. In one embodiment, this device allows an adjustment of the positional relationship between surfaces, to control the angle of wrap and allow adjustment of web tension.
  • FIG. 3 shows the arrangement and constraint pattern, respectively, for turnover mechanism (TB) 30, shown as part of second module 40 from Figure 2.
  • Turnover mechanism TB can optionally be configured as a separate module, with its web media handling compatible with that of second module 40.
  • the position of turnover mechanism TB is appropriately between print zones 54 for opposite sides of the media.
  • a fixed, non-pivoting, drive roller 32 of this device provides the single angular constraint.
  • Lateral constraint is provided by the position of the moving web upstream of stationary turn bar 34, from the left in Figure 3.
  • Stationary turn-bars 34 and 36, respectively upstream and downstream of drive roller 32, are both positioned at diagonals,
  • a driven roller in the turnover mechanism which can be driven independently of drive rollers B and N, allows the tension in the web to be separately maintained both upstream and downstream of the turnover mechanism.
  • a nip roller can be used in conjunction with the driven roller to prevent the web from slipping relative to the driven roller.
  • FIG. 4 shows the position of turnover mechanism TB 30 within the support structure of module 40.
  • Fixed drive roller 32 lies behind turn bars 34 and 36 in the arrangement shown. It can be appreciated that this makes it difficult to access drive mechanism components for turnover mechanism 30 and complicates the operator task of feeding the leading edge of the web media over and around rollers and surfaces of turnover mechanism 30.
  • the web media feeds from the left and exits downstream to the right.
  • Directions D1-D4 are shown for reference to more clearly describe web travel relative to roller 32 and turn bars 34 and 36 in the following sequence.
  • the web media initially traveling in direction Dl, wraps over the first turn bar 34 and then travels in direction D2 in order to feed toward fixed roller 32.
  • the web then wraps over roller 32 and passes between the roller 32 and nip wheels (not shown in FIG. 5).
  • the web then heads back in direction D3, opposite direction D2, toward the second turn bar 36.
  • Turn bar 36 redirects the web media into direction D4.
  • an improved arrangement of turnover mechanism 30 uses a set of guides 100, 102, and 104 in order to help alleviate the difficulty of feeding the leading edge of the web media through turnover mechanism 30.
  • First guide 100 is positioned between the first turn bar 34 and drive roller 32 in order to guide the leading edge toward roller 32 in direction D2, as was described with reference to Figure 5.
  • Second guide 102 is positioned between roller 32 and the second turn bar 36. Second guide 102 helps to guide the leading edge of the web media coming out from roller 32 in direction D3 ( Figure 5) toward turn bar 36.
  • Third guide 104 is positioned to guide the leading edge of the media around turn bar 36 and then out of the turnover mechanism 30 in direction D4 ( Figure 5).
  • Figure 8 also shows the position of a motor 130 that drives roller 32 rotation as part of a media drive module 140.
  • Motor 130 can be remotely actuable and can have a jog capability to assist the operator in initial media edge guidance and feeding, as described subsequently.
  • media guides 100 and 102 have substantially flat portions that extend between the fixed roller 32 and
  • Media guide 104 also has a substantially flat portion that extends away from turn bar 36.
  • an edge portion of any or all guides 100, 102, and 104 may also provide curvature in order to help guide the leading edge around the corresponding roller or fixed turn bar surface.
  • Guide 100 can have a curved portion 118 to direct the leading edge of the web media around turn bar 34, as shown in Figure 6.
  • guide 104 can have a curved portion 108 to direct the leading edge of the web media around the second turn bar 36, as shown in Figure 6.
  • curved portion 118 has approximately a 55 degree wrap about turn bar 34. In the embodiment shown, this is less wrap than the curved portion 108 of the third guide 104 provides about second turn bar 36.
  • wrap angle for any individual guide can be varied to provide an advantageous media edge feed arrangement, based on the design of the turnover mechanism and on characteristics of the intended print media.
  • the amount of wrap provided by any of guides 100, 102, and 104 may vary in other ways.
  • the angular extent of the wrap could vary across the width of the media path for any of the guides, so that a greater or lesser amount of wrap is provided toward one edge of the media path or along the center, for example.
  • Figures 8 and 9 also show a fourth guide 110 that provides a curved surface about roller 32 and is thus positioned to direct the leading edge of the web of media around roller 32 and into nip 112.
  • the drive roller is turned on at low speed to drive the web forward.
  • An edge portion 122 of fourth guide 110 extends onto second guide 102, extending the contact surface for feeding the leading edge onto the contact surface of guide 102.
  • Media traveling away from roller 32, onto guide 102 and in direction D3, is directed by a lower guide surface 107 back toward guide 102, thereby preventing the leading edge of the web media from wrapping around drive roller 32.
  • second media guide 102 extending between fixed roller 32 and turn bar 36, can have a first guide portion (either 107 or 102) located on a first side of the web media and a second guide portion (the other of 107 or 102) for the second side of the media that helps to reduce or even prevent the media leading edge from wrapping around turn bar 36.
  • first guide 100 with end portion 106 and fourth guide 110 guided the leading edge portion 108 of guide 104 direct the leading edge of the web around the second turnbar 36.
  • fixed roller 32 is a driven roller provided with a nip roller 114 in the embodiment shown.
  • the nip roller can be moved by an actuator 120 between two positions, so that in a first position (as shown in Figure 9), a force is applied to roller 32 at a nip 1 12 and in a second position, nip roller 114 is backed away from nip 112 and no force is applied at nip 112.
  • Actuator 120 is remotely actuable in one embodiment.
  • Figure 10 shows fourth guide 110 of Figures 8 and 9 from a rear view according to one embodiment. Cutouts or windows 124 in the guide allow guide 110 to fit in place near drive roller 32 without interfering with nip roller 114. Other types of opening could alternately be used.
  • the roller is not continuous, but is instead segmented, with a number of sections shown as wheels 126. Each segment is independently rotatable in one embodiment. Segments can alternately be castered and gimbaled to minimize constraint imposed on the moving web media.
  • guides 100, 102, 104, and 110 are provided for feeding the leading edge of the web media during loading by the operator. Once the media leading edge has been fed through turnover mechanism 30, these guides typically do not contact the web media. Thus, during printing, guides 100, 102, 104, and 110 do not provide any constraints to the web media such as edge constraint, for example, and are compatible with a kinematic or exact-constraint web transport path, such as that described in commonly-assigned copending U.S. Patent Application Serial No. 12/627,032 filed November 30, 2009 entitled “MODULAR MEDIA TRANSPORT SYSTEM", by DeCook et al. and commonly-assigned copending U.S. Patent Application Serial No. 12/627,018 filed November 30, 2009 entitled “MEDIA TRANSPORT SYSTEM FOR NON- CONTACTING PRINTING", by Muir et al, both incorporated herein by reference.
  • Guides 100, 102, 104, and 110 are provided for the leading edge only and need not extend to cover the full width of the web media. This allows guides 100, 102, 104, and 110 to be used with a printing apparatus that accepts web media of various widths.
  • Guides 100, 102, 104, and 110 can be formed from any suitable material, including metal, plastic, or various sheet materials, for example. Guides can be perforated or otherwise featured to reduce weight, increase rigidity, or to aid in their guidance function.
  • guides 100, 102, 104, and 110 are used by the operator in conjunction with a partially automated media feed apparatus that allows the operator to feed and direct the leading edge into proper position with each turn bar or roller mechanism and use a mechanized sequence to jog the media along the path until it is fed through turnover mechanism 30.
  • steps (i) - (vi) given above are illustrative and can be modified in a number of ways and augmented with any of a number of automated operations.
  • An optional operator switch or other control for enabling jog operation can be provided with a separate device or provided as part of turnover mechanism 30. Additional rollers or other components can be provided to support media feed through drive roller 32.
  • the turnover mechanism 30 described herein can be used with a modular printing apparatus arrangement as described earlier with respect to Figures 1 and 2 or with some other printing apparatus configuration that is not modular. Slack loops are not required between or within modules or other parts of the system. Slack loops can be appropriate where a continuous web is initially fed from a supply roll or as it is re-wound onto a take-up roll, as was described with reference to the printing apparatus of Figure 1.
  • Figures 9, 11, and 12 show various side views of media drive module 140 according to one embodiment of the present invention.
  • Fourth guide 110 has at least a first position, adjacent to roller 32 as shown in Figure 11, used for guiding the lead edge of the web of media into the nip between the nip roller 114 or nip wheels 124 and the drive roller 32.
  • Figure 12 shows guide 110 in a second position, removed from roller 32. This second position is used to provide access to a portion of roller 32. With the guide in the second position and the nip roller 114 moved to the second position by actuator 120, media fragments can be readily removed from around the drive roller in the event of a media break or media jam at the drive roller.
  • a hinge 142 or other mechanism enables mechanical movement of guide 110 between first and second positions.
  • An optional latch mechanism (not shown) is used in one embodiment to temporarily hold guide 110 in its second position during leading edge feed activity.
  • Latching mechanisms can include magnets, springs, pins, detents, or other mechanical devices that help to temporarily hold guide 110 in place.
  • Guide 110 can be self-closing, using gravity, spring-loading, or magnetic attraction, for example.
  • guide 110 has a contact surface 144; guide 102 has a contact surface 146.
  • Contact surface 144 can extend onto contact surface 146. Alternately, contact surfaces 144 and 146 can be offset relative to each other such that guide 110 ensures that the media is directed to the proper side of the downstream guide 102.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

Les figures 11 et 12 présentent diverses vues latérales d'un module (140) d'entraînement de support selon une forme de réalisation de l'invention. Un quatrième guide (110) comporte au moins une première position, adjacente à un galet (32) représenté dans la figure 11, et servant à guider le bord d'attaque de la bande de support dans l'espacement entre le rouleau pinceur (114) ou des roues (124) de pinçage et le galet d'entraînement (32). La figure 12 représente un guide (110) dans une seconde position, dégagée par rapport au galet (32). Cette seconde position permet d'accéder à une partie du galet (32). Quand le guide est dans la seconde position et le rouleau pinceur (114) est déplacé dans la seconde position par un actionneur (120), on peut facilement enlever des fragments de support de la zone entourant le galet d'entraînement en cas de rupture du support ou de blocage du support sur le galet d'entraînement. Une charnière (142) ou un autre mécanisme permet de déplacer mécaniquement le guide (110) entre les première et seconde positions.
PCT/US2011/035458 2010-05-12 2011-05-06 Module d'entraînement de système de transport de support WO2011143054A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/778,210 US20110278389A1 (en) 2010-05-12 2010-05-12 Media transport system drive module
US12/778,210 2010-05-12

Publications (1)

Publication Number Publication Date
WO2011143054A1 true WO2011143054A1 (fr) 2011-11-17

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US (1) US20110278389A1 (fr)
WO (1) WO2011143054A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1249204B (fr) *
GB2006292A (en) * 1977-10-14 1979-05-02 Dornier Gmbh Lindauer Apparatus for transferring an unstable web
GB2096578A (en) * 1981-04-10 1982-10-20 Gd Spa Web guide device for passing web end around return roller
US4787546A (en) * 1986-03-07 1988-11-29 General Scanning, Inc. Apparatus for automatic threading of a web
EP1404601A2 (fr) * 2001-06-15 2004-04-07 Koenig & Bauer Aktiengesellschaft Dispositif pour retourner une bande

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596817A (en) * 1969-11-03 1971-08-03 Eastman Kodak Co Web-handling device
US4036421A (en) * 1976-06-17 1977-07-19 Xerox Corporation Weighted pinch rolls
US4453847A (en) * 1982-09-15 1984-06-12 Xerox Corporation Record carrier feed arrangement for a printer
JP3319542B2 (ja) * 1994-03-31 2002-09-03 富士写真フイルム株式会社 被走査体の搬送装置
JP3524985B2 (ja) * 1995-05-17 2004-05-10 富士写真フイルム株式会社 被走査体の搬送方法および装置
JPH09165129A (ja) * 1995-10-13 1997-06-24 Fuji Photo Film Co Ltd フイルム搬送装置
US6227731B1 (en) * 1999-10-14 2001-05-08 Eastman Kodak Company Printing apparatus
JP4184867B2 (ja) * 2003-05-22 2008-11-19 株式会社沖データ 媒体搬送装置
US20110278390A1 (en) * 2010-05-12 2011-11-17 Armbruster Randy E Media transport system turnover mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1249204B (fr) *
GB2006292A (en) * 1977-10-14 1979-05-02 Dornier Gmbh Lindauer Apparatus for transferring an unstable web
GB2096578A (en) * 1981-04-10 1982-10-20 Gd Spa Web guide device for passing web end around return roller
US4787546A (en) * 1986-03-07 1988-11-29 General Scanning, Inc. Apparatus for automatic threading of a web
EP1404601A2 (fr) * 2001-06-15 2004-04-07 Koenig & Bauer Aktiengesellschaft Dispositif pour retourner une bande

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