EP1386865A2 - Procédé et dispositif pour alimenter des feuilles dans une machine à imprimer - Google Patents

Procédé et dispositif pour alimenter des feuilles dans une machine à imprimer Download PDF

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Publication number
EP1386865A2
EP1386865A2 EP03006971A EP03006971A EP1386865A2 EP 1386865 A2 EP1386865 A2 EP 1386865A2 EP 03006971 A EP03006971 A EP 03006971A EP 03006971 A EP03006971 A EP 03006971A EP 1386865 A2 EP1386865 A2 EP 1386865A2
Authority
EP
European Patent Office
Prior art keywords
sheets
printing
transport path
sheet
feed unit
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.)
Granted
Application number
EP03006971A
Other languages
German (de)
English (en)
Other versions
EP1386865B1 (fr
EP1386865A3 (fr
Inventor
Uwe Weinlich
Eckhard Bauer
Jörg Leyser
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
NexPress Solutions LLC
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 Co, NexPress Solutions LLC filed Critical Eastman Kodak Co
Publication of EP1386865A2 publication Critical patent/EP1386865A2/fr
Publication of EP1386865A3 publication Critical patent/EP1386865A3/fr
Application granted granted Critical
Publication of EP1386865B1 publication Critical patent/EP1386865B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00Feeding articles separated from piles; Feeding articles to machines
    • B65H5/02Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains
    • B65H5/021Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts
    • B65H5/023Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts between a pair of belts forming a transport nip
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00Feeding articles separated from piles; Feeding articles to machines
    • B65H5/34Varying the phase of feed relative to the receiving machine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/40Identification
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00Dynamic entities; Timing aspects
    • B65H2513/50Timing
    • B65H2513/512Starting; Stopping
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00Application field
    • B65H2801/03Image reproduction devices
    • B65H2801/15Digital printing machines

Definitions

  • the invention relates to a method for providing sheets for one-sided or double-sided printing (simplex, duplex; face and reverse printing) in a printing press, in particular in a digital printing press, preferably in an electrophotographic printing machine, the sheets a transport path from one feed unit or a plurality of feed units (Feeder) and preferably during the course of the Transport paths on a conveyor belt (web), which runs through a printing unit, especially with the smallest possible gap between each other following sheets.
  • the invention further relates to a device for providing sheets for one-sided or double-sided printing (Simplex, Duplex; Schön- und Back printing) in a printing press, in particular in a digital printing press, preferably in an electrophotographic printing machine, a transport path for the sheets consisting of one or more feed units Feed units (feeders) and preferably introduce the transport path Conveyor belt (web), which passes through a printing unit, on the sheets are transferable, preferably to carry out the aforementioned method.
  • a transport path for the sheets consisting of one or more feed units Feed units (feeders) and preferably introduce the transport path Conveyor belt (web), which passes through a printing unit, on the sheets are transferable, preferably to carry out the aforementioned method.
  • DE-A-100 23 828 describes an apparatus and a method of the above Known genera.
  • a first transport path section which is in the feed units begins, for example consist of rotating driven clamping belts, between which the sheets are transported.
  • the arches could open a revolving driven conveyor belt is handed over and put on and stick there by electrostatic forces.
  • This conveyor belt is mostly a transparent plastic band and passes through a printing unit that is natural can consist of several printing units for a color print.
  • electrophotographic One latent toner image per color separation will be printed on the sheet transfer.
  • the sheet is transported to a fusing unit, in which the toner image is connected to the printing material, in particular melted and is cooled. For transport into and through the fuser could, in turn, change the transport organ in the transport path occur.
  • Sheets that can only be printed on one side are then transported further or issued in a boom. Sheets to be printed on both sides via a transport path loop after fixation for further printing returned to the printing unit and turned.
  • the return transport and for example, the turn can be made simultaneously by again Clamping belts can be used for this transport path section take a certain helical course and thereby the arches around their in Rotate the transport direction of the longitudinal axes by 180 °.
  • the conveyor belt leading through the printing unit which in the electrophotography is often referred to as web, should also be printed on Arches with the smallest possible spaces between the arches, in order to have the highest possible throughput per time, i.e. one as possible to ensure high printing performance.
  • the invention is therefore based on the object of a method or a device of the genus mentioned at the outset which is or is suitable for the Provide bows improved.
  • this task is solved in that a start time for feeding a sheet from one or the feed unit based on the type of substrate from which the sheet is made is selected.
  • the arches are therefore advantageously dependent on their type, in particular length and / or weight, at different times started, that is, from the respective feed unit into the transport path given in this way to be expected on the transport itself Adjusting misalignments of the arches, especially in relation to each other, from the outset to compensate in such a way, that is to say with an opposite error, that the desired position is set during transport.
  • a further development of the invention provides that information for selection the start time beforehand by at least one test run with at least one Substrate type can be obtained, preferably by trial runs with different Types and with the creation of a corresponding empirical table, for example in the form of a look-up table.
  • the type can be directly taken into account in the pilot control. But it can also be assumed that different types in different supply units are stocked. Like another, provided an independent solution to the task, a start time for feeding from one of the feeding units in each case based on the affected feed unit can be selected.
  • the first-mentioned solution is in particular also only when there is one single feed unit advantageous.
  • the second solution has the advantage that, regardless of the types stored, path length tolerances with the Transport can be compensated for from different feed units by compensating them in advance by choosing suitable start times. Even with a single feed unit, path tolerances can of course between different machines occur, for example due to structural inequalities or changes due to maintenance work, so that no exact setting Factory can be made and according to the invention this also in the choice a start time can be taken into account.
  • pilot controls described can therefore only relatively general and rough, based on the method, for example least squares.
  • a further independent solution to the task therefore provides that with at least one sensor (S2) the arrival time of at least one sheet at the location of the transport path marked by the sensor (S2) is registered and that this registered time of arrival Arc a start time for feeding at least one next arc, the is still in the same feed unit from which the registered one is Sheet comes from this feed unit selected in the transport path or corrected.
  • the arch registered in this way can be even in terms of its location correct only by post-treatment what is within the scope of the present Invention should be essentially disregarded, except for a possible Return for printing on the back, which will be discussed in more detail later will be.
  • the registration of the incoming sheet by the sensor serve to to use this information obtained for at least one sheet of paper is still in the same feeder unit from which the registered sheet came and which should be placed next in the transport path.
  • This arc can be used to improve the starting time from the sensor information can be selected, for example by determining such a start time or by appropriate correction of an existing one, for example type-specific, flat-rate start time in order to achieve that newly corrected sheet arrives more precisely than the previously registered sheet.
  • a time difference with the information is preferred for such an improvement of the sensor that reflects an arrival error, namely by that the time difference between the registered arrival time (actual time) the registered bow and the one calculated from its start time, expected arrival time (TARGET time) determined and as a correction value to correct for the start time for feeding at least one next one Sheet, which is still in the same feed unit from which the registered sheet comes from this feed unit into the transport path is used.
  • the sheets are always related to one another according to the invention regulated, which come from the same feed unit, while sheets from different Feeding stations, at least not through the regulation, albeit with regard to the overall result to be achieved, not with each other in Relationship be brought together, even if such arches are common and successive exists in the transport path for a mixed print job are.
  • the number of sheets from the same feed unit in the transport path section is too large, the time difference of all these sheets is not taken into account for a correction; rather, it is then preferably provided that the number n 1 of those in the transport path section Sheets are only taken as dividers from this feed unit if they do not exceed a specified maximum number n 2 , which is an element from the set of natural numbers, and otherwise this maximum number n 2 is taken as a divisor instead of the actual number n 1 .
  • n 2 could be set equal to 3.
  • the following operation of the printing machine is preferably switched to a more dynamic algorithm as the operating algorithm, which is characterized in that the task is solved independently in that the time difference between the registered arrival time (actual time ) of a sheet arriving at the sensor (S2) and the expected arrival time (TARGET time) calculated from its start time and as a correction value for the correction for the start time or as a correction of a correction value already provided for the correction of this start time of the next sheet , which is still in the same feed unit from which the registered sheet originates, is used for feeding from this feed unit into the sheet provided in the transport path, but in each case divided by the number n 1 of the sheets in the transport path d section together with the currently registered sheet currently located sheets from this same feed unit.
  • This switchover to the operating algorithm preferably takes place after the arcs of the numbers n 2 + 1 to n 1 of the start-up algorithm, which have not been taken into account for a correction, have passed the sensor.
  • Overruns and control oscillations are also to be avoided in this operating algorithm, which is preferably achieved by using a fixed value n 3 , which is an element from the set of natural numbers, instead of the number n 1 if n 1 is less than or equal to n is 3 .
  • n 3 could be set equal to 5.
  • the transport path of a sheet to be printed on both sides is different than that of a sheet to be printed on only one side, in particular the return path addition to the transport route is for sheets to be printed on both sides according to the invention provided in an independent solution of the task with advantage, that a start time for feeding a sheet that is for a double-sided Printing is provided, selected differently from one or the feed unit is considered for a sheet from the same feed unit, which is only for one one-sided printing is provided.
  • runtime errors that are likely to occur due to the return can also occur be precompensated according to the invention in this way.
  • a type of substrate can also be taken into account in this compensation become.
  • the whole group which is also as a block can be referred to by sheets in the return path.
  • sheets to be printed on one side are virtually continuous can be promoted by the printing unit because the transport route, so to speak has an open end, while due to the limited capacity of the The return path is only printed in groups or blocks can.
  • the circulation through the Return path with the circulation of the conveyor belt (web) in whole numbers be coordinated.
  • there is a group-based examination of the arches appropriate and a runtime correction should be based primarily on the medium errors of the group occur, and possibly even independently whether the individual arches have had their start times corrected beforehand has or not.
  • the starting algorithm and the operating algorithm can in principle can also be viewed as independent of whether for a planned bilateral
  • the printing of the start time of a sheet has also been corrected in this regard was or not because the actual start time for these other algorithms can be taken into account.
  • the system can do the respective at any time the actual start times and the number of starts "know” and take into account when evaluating the sensor.
  • arcs can therefore be provided according to the invention speed up or slow down to correct them.
  • This is according to the invention of course in principle also conceivable in other transport sections, in particular also in addition or as an alternative to a change in the start time of an arc, but a change in the starting time is without Complication and additional stress on the mechanics in a simpler manner possible through software.
  • the correct arrival time or the arc distance is the goal is no matter how it is ultimately achieved.
  • the Transport route provided for a test run with at least one sheet less is loaded than it was after testing for subsequent ones Runs is provided.
  • At least one sensor (S2) to register the time of arrival of at least one sheet the location of the transport path marked by the sensor (S2) and that the sensor (S2) is in operative connection with a control unit stands by means of the registered arrival time of the registered arch a starting time and / or the transport speed for feeding at least of a next sheet that is still in the same feed unit from which the registered sheet originates, from this feed unit specifies in the transport path and / or along the transport path or corrected, independent protection is also claimed.
  • n 1 , n 2 and n 3 mentioned above can ultimately be adapted to the mechanical properties, in particular the existing path lengths, the printing press, the desired machine behavior and / or the desired rate of change of the corrections ,
  • the transport path 1 begins with one feed unit or a plurality of feed units, which are indicated schematically only as block 2. From there, arches become the transport path in the transport direction according to arrows 3 supplied, that is, in particular at a certain start time started.
  • a first transport path section 1 a ends in front of a rotating conveyor belt, that forms a second transport path section 1 b and on which the arches to be passed to a printing unit with in this case four color printing units 4 to happen.
  • two sensors S1 and S2 are arranged in the transfer area of the first to the second transport path section 1 a, 1 b.
  • the sensor S1 recognizes a cross seam the conveyor belt 1 b as a marking of this conveyor belt.
  • the sensor S2 detects the arrival of an arch in its area.
  • Both sensors are in connection with a control device 5, which in turn according to the invention acts on the feed unit or units 2, preferably from the information from the sensor S2, taking into account the information from the sensor S1, a starting time for at least one next from the Feeder unit 2 to be started determined or corrected.
  • the arches are made after transitioning to a third Transport path section 1 c of a fixing device with a fixing roller 6 and Back pressure roller 7 fed.
  • An empty strand of the endless conveyor belt 1 b moves in the direction of Arrows 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Ink Jet (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Printing Methods (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
EP03006971A 2002-07-29 2003-03-27 Procédé pour alimenter des feuilles dans une machine à imprimer Expired - Lifetime EP1386865B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10234629 2002-07-29
DE10234629A DE10234629A1 (de) 2002-07-29 2002-07-29 Verfahren und Vorrichtung zur Bereitstellung von Bögen in einer Druckmaschine

Publications (3)

Publication Number Publication Date
EP1386865A2 true EP1386865A2 (fr) 2004-02-04
EP1386865A3 EP1386865A3 (fr) 2005-07-20
EP1386865B1 EP1386865B1 (fr) 2008-06-04

Family

ID=30010507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03006971A Expired - Lifetime EP1386865B1 (fr) 2002-07-29 2003-03-27 Procédé pour alimenter des feuilles dans une machine à imprimer

Country Status (4)

Country Link
US (1) US7212780B2 (fr)
EP (1) EP1386865B1 (fr)
AT (1) ATE397562T1 (fr)
DE (2) DE10234629A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009080090A1 (fr) * 2007-12-24 2009-07-02 Eastman Kodak Company Procédé d'impression d'une image sur une feuille dans une imprimante
EP2703161A3 (fr) * 2012-09-04 2015-10-07 Heidelberger Druckmaschinen AG Machine d'impression duplex à structure en ligne

Families Citing this family (8)

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DE102005038324A1 (de) * 2005-08-11 2007-02-15 Eastman Kodak Co. Verfahren zum Transportieren von Bögen in einer digitalen Druckmaschine
EP2213463A3 (fr) 2005-04-20 2012-04-11 Eastman Kodak Company Procédé pour transporter des feuilles dans une machine d'impression digitale
TWI257999B (en) * 2005-07-29 2006-07-11 Quanta Display Inc Device for detecting a cracked substrate
DE102005038325A1 (de) * 2005-08-11 2007-02-15 Eastman Kodak Co. Verfahren zum Kontrollieren von Bögen in einer digitalen Druckmaschine
DE102007048864B4 (de) * 2007-10-11 2011-07-21 Eastman Kodak Co., N.Y. Transportanordnung zum Transport von Bögen in einer Druckmaschine
US9002256B2 (en) * 2009-10-14 2015-04-07 Xerox Corporation Adaptive scheduler that corrects for paper process directional arrival errors to print engine registration subsystem
EP2388651B1 (fr) 2010-05-17 2021-02-24 Canon Kabushiki Kaisha Appareil de formation d'images amélioré pour le fonctionnement de tâche d'impression impliquant une impression monoface et impression recto-verso
US9193085B2 (en) 2011-05-02 2015-11-24 Bridgestone Corporation Method and device for transfer cutting strip-shaped rubber member

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009080090A1 (fr) * 2007-12-24 2009-07-02 Eastman Kodak Company Procédé d'impression d'une image sur une feuille dans une imprimante
EP2703161A3 (fr) * 2012-09-04 2015-10-07 Heidelberger Druckmaschinen AG Machine d'impression duplex à structure en ligne

Also Published As

Publication number Publication date
US7212780B2 (en) 2007-05-01
US20040047661A1 (en) 2004-03-11
ATE397562T1 (de) 2008-06-15
DE50309942D1 (de) 2008-07-17
DE10234629A1 (de) 2004-02-19
EP1386865B1 (fr) 2008-06-04
EP1386865A3 (fr) 2005-07-20

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