EP2844491B1 - Tintenstrahldrucker mit wählbarem simplex und duplexdruck - Google Patents

Tintenstrahldrucker mit wählbarem simplex und duplexdruck Download PDF

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Publication number
EP2844491B1
EP2844491B1 EP13784658.0A EP13784658A EP2844491B1 EP 2844491 B1 EP2844491 B1 EP 2844491B1 EP 13784658 A EP13784658 A EP 13784658A EP 2844491 B1 EP2844491 B1 EP 2844491B1
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EP
European Patent Office
Prior art keywords
medium
transport path
printing
transport
transported
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.)
Active
Application number
EP13784658.0A
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English (en)
French (fr)
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EP2844491A4 (de
EP2844491A1 (de
Inventor
Sarbjit Parhar
Ke Li
Robert Mccallum
Christopher Thomson
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Delphax Technologies Inc
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Delphax Technologies Inc
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Filing date
Publication date
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Publication of EP2844491A1 publication Critical patent/EP2844491A1/de
Publication of EP2844491A4 publication Critical patent/EP2844491A4/de
Application granted granted Critical
Publication of EP2844491B1 publication Critical patent/EP2844491B1/de
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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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
    • 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
    • B41J11/0015—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 for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/26—Duplicate, alternate, selective, or coacting feeds
    • 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
    • B41J11/0015—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 for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • 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
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/332—Turning, overturning
    • B65H2301/3321—Turning, overturning kinetic therefor
    • B65H2301/33214—Turning, overturning kinetic therefor about an axis perpendicular to the direction of displacement and parallel to the surface of material
    • 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
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/34—Modifying, selecting, changing direction of displacement
    • B65H2301/342—Modifying, selecting, changing direction of displacement with change of plane of displacement
    • B65H2301/3421—Modifying, selecting, changing direction of displacement with change of plane of displacement for changing level of plane of displacement, i.e. the material being transported in parallel planes after at least two changes of direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/40—Identification
    • B65H2511/415—Identification of job
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B65H2513/42—Route, path

Definitions

  • This invention relates to an industrial grade inkjet printer for providing selective simplex (one-sided) and duplex (two sided) printing of a medium and to a method of printing therefor.
  • duplex inkjet printers it is desirable in high speed printers to be able to print cut sheets at a rate of the order of 140 feet per minute. Such a requirement is made more difficult if there is a requirement for duplex printing. It is known in duplex inkjet printers to perform duplex printing by passing a cut sheet into a printing dock under the inkjet printhead, to print one side, to withdraw the cut sheet from the printing dock, turn the cut sheet over, transport the inverted sheet back into the printing dock under the printhead, print the other side, and then direct the duplex printed sheet to an output. The various operations, and in particular the sheet insertions and extractions, take time and detract from the throughput speed. It is desirable either to obviate or modify some of the steps in order to achieve faster duplex and simplex performance with easy selection of the desired printing mode.
  • US 2010/0315460 A1 discloses a printing apparatus which includes a first printing unit group, a second printing unit group, a turnover unit and a control unit.
  • a printer for selective duplex and simplex printing on a medium comprising an input zone and an output zone, a transport mechanism having a selectable first transport path for transporting a medium from the input zone to the output zone past a first print station for printing on one surface of the medium by a first inkjet printhead, the transport mechanism having a second selectable transport path including a substantial part of the first transport path for transporting a medium from the input zone to the output zone past a second print station for printing on one surface of the medium by a second inkjet printhead and then past the first print station for printing on the reverse surface of the medium by the first ink jet printhead, a first diverter drivable between a first position for passing sheet media from the input zone onto the first transport path and a second position for passing sheet media from the input zone onto the second transport path, and a second diverter drivable between a third position for directing sheet media transported on the first transport path towards the output zone and a fourth position for directing sheet
  • the printer can further include a drying unit mounted downstream of at least one of the inkjet printheads.
  • the printer can further comprise at least one continuous belt for transporting the sheet media along at least one of the generally horizontal spans.
  • the printer can further comprise a plurality of rollers positioned to guide a driven web from the input zone to the output zone on the second transport path, a subset of the plurality of rollers positioned to guide a driven web from the input zone to the output zone on the first transport path.
  • the printer can further comprise idler rollers to support the web at the inkjet printheads.
  • the printer further comprises a first priming unit and a first drying unit for priming and drying one surface of a medium transported on the first transport path and for priming and drying one surface of a medium transported on the second transport path, the printer having a second priming unit and a second drying unit for priming and drying a reverse surface of a medium transported on the second transport path.
  • the printer can have first common transport elements operable to transport both sheet media and web media, second transport elements selectively operable to transport sheet media but not web media, and third transport elements selectively operable to transport web media but not sheet media.
  • a method for selectively duplex and simplex printing onto a medium comprising selecting one of a simplex printing mode and a duplex printing mode, when the simplex printing mode is selected, transporting a medium to be printed from an input zone to an output zone along a first transport path past a first printing station for simplex printing onto one surface of the medium by a first inkjet printhead, when the duplex printing mode is selected, transporting a medium to be printed from the input zone to the output zone along a second transport path past a second printing station for printing onto one surface of the medium by a second inkjet printhead and then past the first printing station for printing onto the reverse surface of the medium by the first inkjet printhead wherein the transport path is selected by a first diverter drivable between a first position for passing sheet media from the input zone onto the first transport path and a second position for passing sheet media from the input zone onto the second transport path and a second diverter drivable between a third position for directing sheet media
  • the apparatus has a transport mechanism which takes sheet media such as cut paper sheets from an input zone to an output zone.
  • the transport mechanism presents two possible transport paths: one for sheets that are to be printed on one side only - simplex printing - and the other for sheets that are to be printed on both sides - duplex printing.
  • the shorter transport path takes sheet media though a first print station having printheads for simplex printing one side of the sheet media.
  • the longer transport path embraces much of the shorter path, but takes the sheet media through a second print station having printheads for printing on one side of the sheet media and then takes that sheet through the first print station for printing on the reverse side of the sheet media.
  • the longer path has an S-form with the printheads located at horizontal spans which would be the upper and middle horizontal limbs of the S.
  • a suitable ink delivery system adapted for delivering ink to the multiple level printheads is described in copending U.S. Provisional Patent Application Serial No. 61642310 (Ink delivery system for inkjet print heads) filed May 3, 2012.
  • the transport paths, including the input and output zones, utilize a combination of nips, guides and belts to act on transported sheets to move them through the apparatus.
  • the horizontal spans have respective endless conveyor belts to convey the sheets along the span.
  • a suitable belt and associated drive and control apparatus are as described in copending U.S. Patent Application Serial No.
  • Such printing apparatus has a series of inkjet print heads spaced from one another in a transport direction.
  • a continuous belt driven around a roller system is used to feed sheet media successively to the print heads so that a partial image printed by one print head is overprinted at a subsequent print head with registration of the partial images.
  • a sheet medium is caused to become electrostatically tacked to the belt by passing the sheet past a charging device. Movement of the belt is tracked by a tracking sub-system and operation of the print heads is coordinated with the tracked belt movement to achieve precise registration of the partial images.
  • the electrostatic belt arrangement is particularly useful for conveying the sheet media along the upper and middle spans of the S form transport path although a simpler conveyor belt arrangement can be contemplated for the lower span.
  • FIG. 2 there is shown sheet transport equipment for one span of the S-form transport path.
  • the sheet transport equipment has a continuous belt 32 driven by a drive roller 40 around a series of idler rollers 42.
  • Each of the idler rollers 42 is located adjacent a corresponding inkjet print engine 54 each print engine 54 containing an inkjet printhead 56 and mechanical, electrical and fluidic hardware needed to position and operate the printhead.
  • the inkjet print engine array comprises eight print engines arranged in two staggered banks of four print engines. As shown in this side view, the print engines of each bank are arranged in a wide diameter arc with each print engine facing the belt where the belt 32 passes over an associated idler roller 42. On the face of each printhead 56 are nozzles having exit openings that are spaced from the upper surface of the belt by 1 ⁇ 2 to 1 millimetre.
  • the belt 32 is made of Mylar ®, an electrical insulator having a high dielectric strength which is important because during a printing operation, cut paper sheets 12 are maintained in position on the belt 32 by being electrostatically tacked to the belt. Charge is imparted to the cut paper sheets 12 as they are launched onto the belt 32 by the charge transfer sub-system 48. In the course of a printing operation, the cut sheets 12 are conveyed from right to left as shown in FIG. 2 and as they pass under the array of inkjet printheads 56, the printheads are operated to print partial images on the transported sheets. By ensuring accurate positioning and tracking of the electrostatically tacked sheets 12, accurate high resolution composite images can be obtained consisting of superimposed partial images from successive printheads 56.
  • Such a belt transport arrangement is used in each of the horizontal spans 26, 28 of the S-form transport path. While electrostatic tacking of the sheets 12 to a conveyor belt 32, 34 is preferred, other arrangements are possible for moving sheets to be printed through an S-form path. Also, while the transport mechanism shown has the input and output zones 14, 16 adjacent the top span 26 of the S-form path, the input and output zones 14, 16 can alternatively be adjacent the bottom span 30 or can be at different heights.
  • the transport mechanism includes diverters 58, 59. As shown in the detail view of FIG. 3 , each diverter has a parallel plate sheet guide 60 hingedly mounted on a shaft 62.
  • the parallel plate guide 60 defines a slot 64 at each end for sheet entry and exit. At the entrance and exit locations, the plates are formed with lips 66 to aid sheet entry and exit.
  • the diverter 58 can be moved between limit positions upon operation of a linear actuator drive unit 68.
  • the solenoid drive unit 68 is operable to axially drive a shaft 70, the other end of which is connected to the parallel plate guide 60 to drive the guide about hinge shaft 62. In a first position (the down position), such position being shown in FIG. 3 and in broken line in FIG.
  • the exit region of the diverter 58 is positioned to direct a sheet medium 12 passing through the diverter from right to left onto a path including the guide 74.
  • the exit region of the diverter 58 is positioned to direct a sheet medium 12 passing through the diverter 58 from right to left onto a path including a guide 72.
  • Sheets are driven though the parallel plate guide 60 of the diverter by a nip 76.
  • Corresponding nips 78, 80 are associated with guides 72, 74 and function to draw a sheet 12 from the diverter 58 into a respective one of the guides 72, 74.
  • one such diverter 58 is positioned immediately downstream of the input zone in the shorter transport path.
  • this corresponds to the transported sheet 12 being driven on the shorter transport path essentially in a straight-through track on the top horizontal span 26 of the S-form transport equipment.
  • the diverter 58 is in the down position, this corresponds to the transported sheet 12 being driven on the longer transport path commencing with a downward leg 84 taking the sheet 12 from the input zone 14 to the bottom span 30 of the S-form transport equipment.
  • the diverter 58 is moved between the up and down positions to select for simplex and duplex printing of a sheet 12.
  • the transport includes a second diverter 59 which is in a reverse orientation compared with the diverter 58 and is spaced from it by a bridging span 110 having one of more sheet transfer nips for moving sheet media 12 from the diverter 58 to the diverter 59.
  • the bridging span forms a part of the shorter transport path.
  • the diverter 59 when in the down position receives sheet media transported to the diverter 59 along the longer transport path, and when in the up position, receives sheet media transported along the shorter transport path for simplex printing.
  • the transport mechanism includes 180 degree turn units 88, 89 and 90 degree turn units 86, 87.
  • the turn units are of the form shown in copending U.S. Patent Application Serial No. 13439909 (Registration and transport unit for a sheet feeder) filed April 5, 2012, the contents of which are hereby incorporated by reference in their entirety and made part of the present United States Patent Application for all purposes.
  • a turn unit 88 has a pair of plates 90, 92 mounted in parallel relationship. The plates 90, 92 are spaced apart to leave a slot along which sheet media are to be transported, and are curved so as to turn the transported sheet media through the desired angle.
  • the plate 90 has apertures 94, 96 distributed over its area, the apertures being aligned with corresponding apertures 98, 100 in the plate 92.
  • a roller pair 102, 104 comprising a drive roller on the outside of the curve and an idler roller on the inside of the curve.
  • the roller pairs each form a nip for gripping a sheet located in the slot and the drive roller of each pair is used to drive the sheet along the slot.
  • the printer also includes a pair of priming fluid applicator units 106.
  • the function of the units 106 is to coat sheets 12 such as cut paper sheets with a coating of fluid as the paper is transported through the units.
  • Application of the priming fluid acts to present a layer of material on the sheet that means that subsequently jetted inks result in a higher quality image than would be the case if no primer were used.
  • the primer may increase the waterfastness of certain inks in comparison with printing onto paper without primer. Alternatively, or in addition, the primer may improve the colour gamut.
  • the priming fluid is applied with a roller although other suitable means may be adopted.
  • Each priming unit has a dryer 108 positioned immediately downstream of the primer applicator unit to dry the applied priming fluid before the coated sheet 12 is further manipulated.
  • One primer applicator unit 106 is located in the input zone 14 and is used to prime the surface of a sheet medium 12 moving from right to left through the zone 14, regardless of whether the sheet is to be printed on one side or both.
  • the other primer applicator unit 106 is located in the downward span 84 additionally to coat the reverse side of sheets 12 that are destined to be duplex printed.
  • Both of the primer applicator units 106 have associated dryers 108 to dry the applied primer coat.
  • the dryer units are radiant heater dryers having a pair of twin carbon filament bulbs extending across the full width of the printing apparatus to accommodate double page width sheets.
  • the first step that is performed is to decide whether the sheet is to be simplex printed or duplex printed. If that decision is simplex printing, the two diverters 58 are driven to their up positions. Sheet material 12 to be printed is driven from the right as shown into the input zone 14. A first of the priming fluid applicators 106 is then operated to coat the upper side of the sheet 12 with priming fluid and the dryer in the input zone is operated to dry the applied coating. The sheet 12 is then driven by nips into the diverter 58 which directs the sheet into the guide 72 which forms part of a bridging span 110, forming a part of the shorter transport path, where it is registered against a side reference member (not shown).
  • Re-referencing of the side edge of the sheet 12 is repeated periodically as the sheet is transported through the equipment.
  • the sheet 12 is driven by a further nip or nips associated with a bridging span to the reverse oriented diverter 59 onto the continuous belt 32 occupying the top span 26 of the S-form transport mechanism.
  • the sheet medium 12 is electrostatically tacked to the belt 32 which then conveys the sheet 12 under an array 20 of inkjet printheads which operate in sequence to print a composite image onto the sheet 12.
  • the image is dried at a dryer 112 which is similar to the dryer 108.
  • the printed sheet 12 is then conveyed by further nips from the belt 32 to the output zone 16.
  • the sheet medium 12 throughout its movement though the transport equipment is monitored by optical sensors which determine any problem caused by a paper jam and can be used to ensure that the sheet media are properly aligned.
  • the two diverters 58, 59 are driven to their down positions.
  • Sheet material 12 to be printed is again driven from the right as shown into the input zone 14 and the priming fluid application unit 106 and the dryer 108 associated with the input zone are operated in a similar manner as for simplex printing to prime one surface of the sheet 12.
  • the sheet 12 is then driven into the diverter 58 which directs the sheet into the 90 degree curved guide 86.
  • Nips associated with the curved guide drive the sheet downwardly to a reverse 90 degree curved guide 87.
  • the sheet passes through a second priming fluid applicator unit 106 and its associated dryer 108 to impart a primer coating to the unprimed surface of the sheet 12.
  • the sheet is launched onto the lowest span 30 of the S-form transport path.
  • the leftward driven sheet 12 is turned though 180 degrees at a 180 degree curved guide 88 and launched onto the middle span 28 of the S-form transport path.
  • the sheet medium 12 is electrostatically tacked to the belt 34 which then conveys the sheet 12 under an array 24 of inkjet printheads which operate in sequence to print a composite image onto one surface of the sheet 12.
  • the image is dried at a dryer 112 similar to the dryer 108.
  • the rightwardly driven sheet is turned though a reverse 180 degrees at another curved guide 89.
  • the transported sheet is directed into the reverse oriented diverter 59 and onto the continuous belt 32 of the top span 26 of the S-form transport mechanism.
  • the sheet is registered against a side reference plate at each of the curved guides 88, 89.
  • the sheet medium 12 is electrostatically tacked to the belt 32 which then conveys the sheet 12 under the upper array of inkjet printheads 56 which operate in sequence to print a composite image onto the reverse surface of the sheet.
  • the image is complete, it is dried at another drier 112 which is similar to the dryer 108 and then is directed to and through the output zone 16 in the same manner as simplex printed sheets.
  • FIGs. 5 and 6 there are shown side views of printing apparatus according to another embodiment of the invention.
  • the apparatus has a transport mechanism which takes a web medium such as a paper web 13 from an input zone 14 to an output zone 16.
  • the transport mechanism as shown in the FIG. 5 configuration, provides a transport path for duplex printing of the web 13, while the transport mechanism, as shown in the FIG. 6 configuration, provides a transport path for simplex printing.
  • the shorter simplex transport path takes the web 13 though a first print station having a printhead array 20 for simplex printing.
  • the longer transport path embraces much of the shorter path, but takes the web 13 through a second print station having a printhead array 24 for printing on one side of the web and then takes the web 13 through the first print station for printing on the reverse side of the web.
  • the longer path has an S-form with the printhead arrays 20 and 24 located respectively at the upper and middle horizontal limbs of the S.
  • the transport paths including the input and output zones, utilize a combination of idler rollers 114 and 42 to guide and support the web 13 as it is driven through the printing apparatus.
  • the inkjet print engine and printhead array at each of the upper and lower levels of the printer can be essentially as described with reference to the embodiment of FIG. 1 .
  • the web 13 is conveyed from right to left as shown in FIGs. 5 and 6 and as it passes under the inkjet printhead arrays 20, 24 at the respective printing stations, the printheads are operated to print partial images on the transported sheets.
  • accurate high resolution composite images can be obtained consisting of superimposed partial images from successive printheads at each station.
  • the idler rollers 114 are brought into service for duplex printing by threading the web 13 around them.
  • a leading end of the web is threaded successively around the rollers 114a to 114f.
  • the rollers 114a to 114f are mounted on a laterally slidable carriage and a portion of the web 13 between the belts is held temporarily in a position where the carriage can be slid into place for duplex printing with the intervening web portion draped around the idler rollers 114.
  • the web is then tensioned to tighten it around the rollers before web transportation and printing begins.
  • the array of rollers 114 is arranged to bring the web 13 through a transport path configured substantially the same as the sheet transport path of FIG. 1 .
  • the printer also includes a pair of priming fluid applicator units 106 for coating a surface of the web with priming fluid as the web is transported past the priming units.
  • Each priming unit has an associated dryer 108 positioned immediately downstream to dry the applied priming fluid.
  • One primer applicator unit 106 is located in the input zone 14 and is used to prime the surface of the web 13 as it moves through the zone 14, regardless of whether the web is to be printed on one side or both.
  • the other primer applicator unit 106 is located adjacent a downwardly extending web span 118 to coat any web 13 that is destined to be duplex printed.
  • the web 13 In operating the printer for simplex printing, the web 13 is driven from the right as shown into the input zone 14 and is guided in a direct route between the idler rollers 114a and 114f.
  • the first priming fluid applicator 106 at the input zone is operated to coat the upper side of the web 13 with priming fluid and its associated dryer 108 is operated to dry the applied coating.
  • the tensioned web 13 is supported by idler rollers 42 as it is fed along the top span of the S-form transport path and under the printhead array 20.
  • the printheads operate in sequence to print a composite image onto the web 13 and the image is dried at dryer 112.
  • the web 13 is driven from the right into the input zone 14 and the first priming fluid application unit 106 and dryer 108 are operated to prime and dry one surface of the web 13.
  • the web 13 is guided around roller 114a and downwardly past the second priming fluid applicator 106 and dryer 108 which are operated to prime and dry a reverse side of the web 13.
  • the web is guided around the roller 114b and directed along the lowest span of the S-form transport path.
  • the web is then turned though 180 degrees at the pair of rollers 114c, 114d and directed along the middle span of the S-form transport path where it is supported by idler rollers 42.
  • the web is conveyed under the array 24 of inkjet printheads which operate in sequence to print a composite image onto one surface of the web 12.
  • the image is dried at a lower dryer 112 similar to the dryer 108.
  • the rightwardly driven web is turned though a reverse 180 degrees at roller pair 114e, 114f.
  • the web is directed along the top span of the S-form transport path where it is supported by idler rollers 42 as passes under the top array 20 of inkjet printheads 56 which operate in sequence to print a composite image onto the upwardly facing surface of the web.
  • the image is complete, it is dried at the upper drier 112 and then directed to and through the output zone 16.
  • FIG. 1 provides a versatile apparatus for switching rapidly between a configuration adapted for simplex printing of sheet media and a configuration adapted for duplex printing of sheet media.
  • FIG. 5 provides a versatile apparatus for switching rapidly between a configuration adapted for simplex printing of a web medium and a configuration adapted for duplex printing of a web medium.
  • Printing operations are usually tailored either to cut sheet printing or to web printing. However, on occasion, there may be a need to switch a printing plant between printing sheet media and printing a web medium.
  • FIGs. 7, 8 and 9 is an arrangement which enables switching both between duplex and simplex printing and between cut sheet printing and web printing. In the schematic plan view of FIG.
  • elements of the printing apparatus which are used in common for both cut sheet and web printing. These include an upper printhead array 20, a priming applicator 106 and dryer 108 at the input zone, and a dryer 112 at the output zone.
  • a second priming applicator and dryer (not shown) occupy positions substantially the same as corresponding elements shown 106, 108 in the embodiment of FIG. 5 .
  • Other elements of the printing apparatus are mounted on a common carriage which is reciprocably slidable in the direction C and which, in FIG. 7 , is shown in an intermediate position. Details of the carriage and a bearing arrangement to enable it to be slid relative to the common elements of the printer are not shown.
  • diverters 58, 59, bridging element 110 plus its associated roller nip, and turning units 86, 89 and belt 116b are used for sheet printing.
  • the sheet printing elements also include at a lower level as shown in FIG. 8 turning units 87, 88 and belts 116c, 116d.
  • rollers 114a, 114b, 114d and 114f and, at a lower level as shown in FIG. 9 , rollers 114c and 114e, are used for web printing.
  • the carriage and the elements supported by it are slid upwardly as shown in FIG. 7 to bring the sheet printing elements into registration with the common printing elements to enable sheet printing.
  • the carriage and the elements supported by it are slid downwardly as shown in FIG. 7 to bring the web printing elements into registration with the common printing elements to enable web printing.

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  • General Health & Medical Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ink Jet (AREA)

Claims (10)

  1. Drucker für selektives doppelseitiges und einseitiges Drucken auf einem Medium, aufweisend einen Eingangsbereich und einen Ausgangsbereich, einen Transportmechanismus, der einen auswählbaren ersten Transportpfad hat, um ein Medium von dem Eingangsbereich zu dem Ausgangsbereich zu transportieren, vorbei an einer ersten Druckstation zum Drucken auf einer Oberfläche des Mediums durch einen ersten, wobei der Transportmechanismus einen zweiten auswählbaren Transportpfad hat, der einen Teil des ersten Transportpfads enthält, um ein Medium von dem Eingangsbereich zu dem Ausgangsbereich zu transportieren, vorbei an einer zweiten Druckstation zum Drucken auf einer Oberfläche des Mediums durch einen zweiten Tintenstrahl-Druckkopf und anschließend vorbei an der ersten Druckstation zum Drucken auf der Rückseite der Oberfläche des Mediums durch den ersten Tintenstrahl-Druckkopf, eine erste Umlenkvorrichtung, die zwischen einer ersten Stellung zum Weiterleiten von Blattmedien von dem Eingangsbereich zu dem ersten Transportpfad und einer zweiten Stellung zum Weiterleiten von Blattmedien von dem Eingangsbereich auf den zweiten Transportpfad antreibbar ist, und eine zweite Umlenkvorrichtung, die zwischen einer dritten Stellung zum Führen von auf dem ersten Transportpfad transportierten Blattmedien zum Ausgangsbereich und einer vierten Stellung zum Führen von auf dem zweiten Transportpfad transportierten Blattmedien zu dem Ausgangsbereich antreibbar ist, wobei:
    der erste und der zweite Transportpfad eine erste horizontale Brücke auf einer ersten Höhe enthalten, und der erste Tintenstrahl-Druckkopf positioniert ist, um Tinte auf das Medium nach unten auszustoßen, wenn es in einer ersten Richtung entlang der ersten horizontalen Brücke transportiert wird; und
    der zweite Transportpfad eine zweite horizontale Brücke auf einer zweiten Höhe enthalten, und der zweite Tintenstrahl-Druckkopf positioniert ist, um Tinte auf das Medium nach unten auszustoßen, wenn es in einer zweiten Richtung entgegengesetzt zu der ersten Richtung entlang der zweiten horizontalen Brücke transportiert wird;
    dadurch gekennzeichnet, dass die erste und die zweite horizontale Brücke vertikal angrenzende horizontale Schenkel eines S-förmigen Pfads sind.
  2. Drucker nach Anspruch 1, ferner aufweisend eine Drehungseinheit, um ein Medium zwischen den horizontalen Brücken um 180 Grad zu drehen.
  3. Drucker nach Anspruch 1 oder 2, ferner aufweisend eine Trocknungseinheit, die stromabwärts von mindestens einem der Tintenstrahl-Druckköpfe angebracht ist.
  4. Drucker nach einem der vorhergehenden Ansprüche, ferner aufweisend mindestens ein Endlosband zum Transportieren von Blattmedien.
  5. Drucker nach einem der Ansprüche 1 bis 3 zum Drucken auf einem Gewebemedium, wobei der Drucker ferner eine Mehrzahl von Walzen aufweist, die positioniert sind, um ein angetriebenes Gewebe von dem Eingangsbereich zu dem Ausgangsbereich auf dem zweiten Transportpfad zu führen, wobei eine Untergruppe der Mehrzahl von Walzen positioniert ist, um ein angetriebenes Gewebe von dem Eingangsbereich zum dem Ausgangsbereich auf dem ersten Transportpfad zu führen.
  6. Drucker nach Anspruch 5, ferner aufweisend Tragrollen zum Unterstützen des Gewebes an den Tintenstrahl-Druckköpfen.
  7. Drucker nach einem der vorhergehenden Sprüche, ferner aufweisend eine erste Grundierungseinheit und eine erste Trocknungseinheit zum Grundieren und Trocknen einer Oberfläche eines Mediums, das auf dem ersten Transportpfad transportiert wird, und zum Grundieren und Trocknen einer Oberfläche eines Mediums, das auf dem zweiten Transportpfad transportiert wird.
  8. Drucker nach Anspruch 7, ferner aufweisend eine zweite Grundierungseinheit und eine zweite Trocknungseinheit zum Grundieren und Trocknen einer Rückseite einer Oberfläche des Mediums, das auf dem zweiten Transportpfad transportiert wird.
  9. Drucker nach einem der Ansprüche 1 bis 3, wobei der Drucker erste gemeinsame Transportelemente hat, die betreibbar sind, um sowohl Blattmedien als auch Gewebemedium zu transportieren, zweite Transportelemente, die selektiv betreibbar sind, um Blattmedien, aber keine Gewebemedien zu transportieren, und dritte Transportelement, die selektiv betreibbar sind, um Gewebemedien, aber keine Blattmedien zu transportieren.
  10. Verfahren für selektives doppelseitiges und einseitiges Drucken auf einem Medium, aufweisend Auswählen eines einseitigen Druckmodus oder eines doppelseitigen Druckmodus, wobei, wenn der einseitige Druckmodus gewählt wird, ein zu bedruckendes Medium von einem Eingangsbereich zu einem Ausgangsbereich entlang eines ersten Transportpfads transportiert wird, vorbei an einer ersten Druckstation zum Drucken auf einer Oberfläche des Mediums durch einen ersten Tintenstrahl-Druckkopf, wobei, wenn der doppelseitige Druckmodus gewählt wird, ein zu bedruckendes Medium von dem Eingangsbereich zu dem Ausgangsbereich entlang eines zweiten Transportpfads transportiert wird, vorbei an einer zweiten Druckstation zum Drucken auf einer Oberfläche des Mediums durch einen zweiten Tintenstrahl-Druckkopf und anschließend vorbei an der ersten Druckstation zum Drucken auf der Rückseite der Oberfläche des Mediums durch den ersten Tintenstrahl-Druckkopf, wobei:
    der Transportpfad ausgewählt wird von einer ersten Umlenkvorrichtung, die zwischen einer ersten Stellung zum Weiterleiten von Blattmedien von dem Eingangsbereich zu dem ersten Transportpfad und einer zweiten Stellung zum Weiterleiten von Blattmedien von dem Eingangsbereich auf den zweiten Transportpfad antreibbar ist, und einer zweiten Umlenkvorrichtung, die zwischen einer dritten Stellung zum Führen von auf dem ersten Transportpfad transportierten Blattmedien zum Ausgangsbereich und einer vierten Stellung zum Führen von auf dem zweiten Transportpfad transportierten Blattmedien zu dem Ausgangsbereich antreibbar ist;
    der erste und der zweite Transportpfad eine erste horizontale Brücke auf einer ersten Höhe enthalten, und der erste Tintenstrahl-Druckkopf positioniert ist, um Tinte auf das Medium nach unten auszustoßen, wenn es in einer ersten Richtung entlang der ersten horizontalen Brücke transportiert wird; und
    der zweite Transportpfad eine zweite horizontale Brücke auf einer zweiten Höhe enthalten, und der zweite Tintenstrahl-Druckkopf positioniert ist, um Tinte auf das Medium nach unten auszustoßen, wenn es in einer zweiten Richtung entgegengesetzt zu der ersten Richtung entlang der zweiten horizontalen Brücke transportiert wird;
    dadurch gekennzeichnet, dass die erste und die zweite horizontale Brücke vertikal angrenzende horizontale Schenkel eines S-förmigen Pfads sind.
EP13784658.0A 2012-05-03 2013-05-02 Tintenstrahldrucker mit wählbarem simplex und duplexdruck Active EP2844491B1 (de)

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DE102015017160B4 (de) 2015-09-03 2024-01-04 Koenig & Bauer Ag Maschinenanordnung mit mehreren Bearbeitungsstationen zum sequentiellen Bearbeiten mehrerer bogenförmiger Substrate
DE102015216870B4 (de) * 2015-09-03 2020-08-13 Koenig & Bauer Ag Maschinenanordnung mit mehreren Bearbeitungsstationen zum sequentiellen Bearbeiten mehrerer bogenförmiger Substrate
WO2017202848A1 (de) * 2016-05-24 2017-11-30 Koenig & Bauer Ag Bogendruckmaschine

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EP1068560B1 (de) * 1998-03-31 2002-04-10 Océ Printing Systems GmbH Verfahren zum bedrucken von einzelblättern in gruppen nach dem duplexverfahren
JP2005067794A (ja) * 2003-08-22 2005-03-17 Seiko Epson Corp Ｓ字型の搬送路を備えた用紙処理装置
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