EP1661703A2 - Méthode de nettoyage et pour garder propre une unité d'encrage et unité d'encrage correspondante - Google Patents

Méthode de nettoyage et pour garder propre une unité d'encrage et unité d'encrage correspondante Download PDF

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Publication number
EP1661703A2
EP1661703A2 EP05077324A EP05077324A EP1661703A2 EP 1661703 A2 EP1661703 A2 EP 1661703A2 EP 05077324 A EP05077324 A EP 05077324A EP 05077324 A EP05077324 A EP 05077324A EP 1661703 A2 EP1661703 A2 EP 1661703A2
Authority
EP
European Patent Office
Prior art keywords
inking
roller
rollers
inking unit
ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05077324A
Other languages
German (de)
English (en)
Other versions
EP1661703A3 (fr
Inventor
Harrie Van Dijk
Bram Bergsma
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.)
Van Dam Machine BV
Original Assignee
Van Dam Machine BV
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 Van Dam Machine BV filed Critical Van Dam Machine BV
Publication of EP1661703A2 publication Critical patent/EP1661703A2/fr
Publication of EP1661703A3 publication Critical patent/EP1661703A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/04—Cleaning arrangements or devices for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices

Definitions

  • the present invention relates to a method of cleaning and keeping clean an inking unit of a printing device, and to an inking unit arranged for being able to carry out the method.
  • the inking unit comprises a train of rollers with a number of successive inking rollers by which ink from an ink duct is brought onto the printing cloth, printing block. After a certain production time or in case the inking unit should be changed to another colour, the train of inking rollers and the housing in which it is accommodated, must be cleaned. This is a cumbersome and time-consuming operation, in which considerable amounts of diluents and/or cleaners are used, since the amount of ink should not only be removed from the entire train of inking rollers, but from the inside of the housing as well. The latter is definitely required for preventing a preceding colour from blending with a new colour in the end.
  • the object of the invention is to facilitate the cleaning operation and further to prevent deposition of ink on the inside of the housing and other parts.
  • the invention provides for that the cleaner is applied on at least a part of the rolling length of one inking roller of the ink unit with the help of at least one spraying member, with at least one of the inking rollers being driven and at least part of the cleaning is carried out across corresponding parts of the rolling lengths of successive inking rollers of the inking unit. Additionally, it is provided for that with at least one inking roller, ink and cleaner is scraped across at least a part of the rolling length of the inking roller.
  • the method according to the invention provides the great advantage that the successive inking rollers can maintain their mutual grip through the parts not covered by cleaner, due to which the successive inking rollers can be continued to be driven.
  • the cleaner can be distributed across the successive inking rollers and these can be cleaned across a part of their lengths, in which the ink and cleaner can be removed by the scraping member. Then, among the parts of the successive inking rollers thus cleaned, sufficient grip will be reestablished to be able to drive the inking rollers during cleaning of the further parts of the successive inking rollers.
  • a first set of spraying members applies cleaner onto corresponding parts of the rolling lengths of two successive inking rollers and a second set of spraying members applies cleaner on corresponding parts of the rolling lengths of two further successive inking rollers in the inking unit.
  • the second set of spraying members with an inking roller transferring the ink onto a higher and a lower further inking roller, are directed at the transferring inking roller and the higher further inking roller.
  • the cleaner will also be passed to higher inking rollers if it is applied onto lower inking rollers, especially in case of a division in the train of rollers into higher and lower parts, it is particularly advantageous to apply the cleaner onto both the inking roller where the division begins and onto the connecting higher inking roller.
  • a further object of the invention is to prevent contamination of the inking unit by said inking mist, both during use of the inking unit and during cleaning thereof, to which end it is provided for, that said ink mist arising during use or cleaning of the inking unit is extracted. It is important that one employs a moderate air flow such that no turbulences will occur in the ink mist and it can be discharged uniformly without still being deposited against the housing and other parts of the inking unit.
  • an air flow for exhausting the ink mist is generated which is led to a filtering member at or near the inking unit from a lateral direction or lateral directions.
  • the inking rollers of the inking unit are accommodated in a housing extending from near the printing roller with printing cloth up to near or across the ink duct, said housing being closed entirely or for the larger part between said outer ends, in which an underpressure member for generating an air flow within the housing is provided at one outer end.
  • the housing has openings laterally of the effective axial surface of one or more of the successive inking rollers, and that the underpressure member is mounted near the ink duct.
  • the method of cleaning the inking unit is preferably carried out entirely of partly automated.
  • Fig. 1 illustrates a cross-section of an inking unit 1, comprising a housing 2 in which a train 3 of rollers is mounted by which the ink from ink duct 4 is passed to the printing roller 5 having a printing cloth or printing block not further indicated.
  • a first inking roller 6 the ink is taken from the ink duct and transferred onto a further inking roller 8 by a vibrating roller 7.
  • the vibrating roller 7 is reciprocated between the inking rollers 6, 8 and serves for dosing the ink.
  • the ink is transferred onto distributing roller 9, from which the ink is brought onto the printing cloth or printing block through an upper set of inking rollers 10, 11 and a lower set of inking rollers 12, 13.
  • inking rollers 10, 12 and 6 are driven by a driving mechanism or mechanisms not further indicated and the contact pressure between the successive inking rollers drives the further inking rollers in the train of rollers.
  • rollers 10, 12 perform an oscillating movement in axial direction.
  • a scraping member having a scraping knife 14 and a receptacle 15 is mounted against the lower driven inking roller 12.
  • the scraping knife can be mounted against the roller and be moved away from the roller by means not further indicated in the drawing.
  • An underpressure member 16 having an orifice 17 and filter 18 is mounted at the bottom of the housing 2 of the inking unit 1 near the ink duct 4 and accompanying roller 6.
  • the underpressure formed with underpressure member 16 causes the ink mist arising during use of the inking unit to be led to the underpressure member in a very uniform air flow, where the ink is captured by the filter 18, and the air let off below the ink duct 4.
  • Fig. 2 shows the situation during cleaning of the inking unit, in which spraying members 19, 20 spray a cleaner onto corresponding parts of vibrating roller, inking roller 7, 8, and distributing roller, driven roller 9, 10. See further Fig. 3 for distribution of all spraying members in relation to the train of rollers of inking unit 1.
  • Ink duct 4 and accompanying inking roller 6 are cleaned individually. To that end, the ink duct 4 can be taken from the inking unit 1.
  • Roller 6 is an inking roller having a driving mechanism of its own and running free from rollers 7 through 13 during cleaning of said rollers 7 through 13 and thus is cleaned separately from them. Further, printing roller 5 is kept free from inking rollers 11 and 13 during cleaning.
  • the cleaner emerging from spraying member 19 dilutes the ink on rollers 7, 8, in which the diluted ink is brought to driven ink roller 12 through distributing roller 9, and it can be removed from said driven inking roller 12 by a scraping knife 14. Before removing the diluted ink, it is first led across inking roller 13 in order to dilute the ink there as well and to subsequently remove it through the driven roller 12.
  • the scraping knife 14 can be divided in segments and be mounted only against the part of the inking roller 12 upon which the cleaner is applied. However, this would render the scraping member unnecessarily complicated and it is furthermore in no way required since the ink should be removed from the entire length of the roller in the end.
  • Inking roller 12 is preferably a metal roller and the scraping knife 14 is usually made of a plastic material.
  • Cleaner emerging from spraying member 20 dilutes the ink on distributing roller 9 and inking roller 10, which can likewise be a driven inking roller.
  • inking roller 10 the ink on inking roller 11 is diluted as well, in which the diluted ink of ink roller 11 is led to the driven ink roller 12 through inking roller 10 and distributing roller 9, and is removed from said inking roller 12 by scraping knife 14.
  • the next part of the inking rollers can be cleaned.
  • the most favourable way is to divide the cleaning across two parts, in which the parts cover at least half the effective rolling lengths of the inking rollers and preferably slightly more than that so that the central parts of the inking rollers are properly cleaned as well.
  • Cleaning can take place in a number of subsequent steps in which first, a first cleaning across the parts takes place for removing large amounts of ink and then one or more further steps take place in which all ink remnants are removed.
  • the scraping knife is controlled such, that inking roller 13 connecting to the driven inking roller 12 can also be provided with enough cleaner for being able to clean it just as well as the other inking rollers.
  • the driving speeds of the driven rollers can be controlled, in such a way that the diluted ink does not cause more haze than non-diluted ink.
  • underpressure member 16 also allows for that the haze of diluted ink is discharged and can not be deposited against the housing or other parts of the inking unit. If necessary, the underpressure formed by underpressure member 16 can be adjusted during cleaning of the inking unit, decreased or increased in accordance with the haze created.
  • Fig. 3 illustrates spraying members 19, 20 and 21, 22, respectively, situated in spaced apart relationship, and each capable of providing at least half of the effective width of the inking rollers with cleaner.
  • the inking rollers are provided with shafts extending, as indicated schematically, across a considerable length in relation to the length of the actual ink surface of the inking rollers.
  • the spraying members 19-22 comprise substantially one or more nozzles having a wide opening angle. This is intended to provide for that the cleaner will not be formed into a haze but will be brought onto the rollers in fine droplets. A strongly hazed agent could cause it to deposit against the inside of the housing together with ink particles after all.
  • the orifice of the nozzles has a wide angle, thus excluding dripping. This is important, because dripping of nozzles during the normal printing process will hinder the printed matter.
  • Spraying members 19-22 are mounted in profiles 23, 24 extending across the width of housing 2 of the inking unit 1. Said spraying members 19-22 are provided with supplies and controls of their own in a way not further indicated, which can be for each of the spraying members separately, or per set of spraying members 19, 20 and 21, 22.
  • Fig. 4 illustrates a plan view of the inking unit 1 having the housing 2 and a lid 25 mounted on housing 2.
  • the lid 25 has rows of openings 26, 27 along the sides.
  • the underpressure applied within the housing causes a lateral inflow of air through these openings 26, 27 and toward centrally situated underpressure member 16 (see also Fig. 5). This keeps the ink mist away from the housing and forms an approximately centrally situated discharge flow towards the underpressure member 16.
  • Underpressure member 16 is incorporated in a connecting profile 28 by which opposite walls of the housing 2 are connected.
  • the underpressure member 16 comprises two orifices 29, 30 through which an air pipe 31 is transversely led, having a much smaller diameter than the diameter of the orifices.
  • Air pipe 31 is provided with openings 32, through which pressurized air is blown out causing an underpressure in the orifices.
  • the underpressure is controlled such, that at the other side of ink filter 18 there is sufficient underpressure for maintaining a particularly uniform air flow.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Ink Jet (AREA)
EP05077324A 2004-10-19 2005-10-12 Méthode de nettoyage et pour garder propre une unité d'encrage et unité d'encrage correspondante Withdrawn EP1661703A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1027297A NL1027297C1 (nl) 2004-10-19 2004-10-19 Werkwijze voor het reinigen respectievelijk schoonhouden van een inktwerk van een drukinrichting, alsmede een daartoe aangepast inktwerk.

Publications (2)

Publication Number Publication Date
EP1661703A2 true EP1661703A2 (fr) 2006-05-31
EP1661703A3 EP1661703A3 (fr) 2006-06-07

Family

ID=36088522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05077324A Withdrawn EP1661703A3 (fr) 2004-10-19 2005-10-12 Méthode de nettoyage et pour garder propre une unité d'encrage et unité d'encrage correspondante

Country Status (2)

Country Link
EP (1) EP1661703A3 (fr)
NL (1) NL1027297C1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303652A (en) * 1992-02-13 1994-04-19 Baldwin Technology Corporation Spray blanket cleaning system
US5365849A (en) * 1992-09-18 1994-11-22 Heidelberger Druckmaschinen Aktiengesellschaft Device for washing an inking unit provided at a printing press
DE29609426U1 (de) * 1996-05-28 1996-08-14 Heidelberger Druckmaschinen Ag, 69115 Heidelberg Wascheinrichtung für Farbwerke von Druckmaschinen
US5732631A (en) * 1995-06-06 1998-03-31 Man Roland Druckmaschinen Ag Method and device for cleaning a cylinder of a rotary printing machine
EP0928687A1 (fr) * 1997-12-16 1999-07-14 Richard Munz Dispositif de nettoyage du blanchet dans une presse d'impression
US20020139268A1 (en) * 2001-03-27 2002-10-03 Emery David Crowell Apparatus for selectively cleaning a printing press cylinder
DE10149843A1 (de) * 2001-10-10 2003-04-17 Hermeling Gerhard Abdeckhaube für ein Druckwerk
US6561095B1 (en) * 1998-12-31 2003-05-13 Koenig & Bauer Aktiengesellschaft Device for cleaning a roller
US20030167948A1 (en) * 2002-03-05 2003-09-11 Weitz Martin J. Method and apparatus for steam cleaning anilox inking rollers
EP1502740A2 (fr) * 2003-07-26 2005-02-02 MAN Roland Druckmaschinen AG Dispositif pour l'aspiration dans un système d'encrage

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303652A (en) * 1992-02-13 1994-04-19 Baldwin Technology Corporation Spray blanket cleaning system
US5365849A (en) * 1992-09-18 1994-11-22 Heidelberger Druckmaschinen Aktiengesellschaft Device for washing an inking unit provided at a printing press
US5732631A (en) * 1995-06-06 1998-03-31 Man Roland Druckmaschinen Ag Method and device for cleaning a cylinder of a rotary printing machine
DE29609426U1 (de) * 1996-05-28 1996-08-14 Heidelberger Druckmaschinen Ag, 69115 Heidelberg Wascheinrichtung für Farbwerke von Druckmaschinen
EP0928687A1 (fr) * 1997-12-16 1999-07-14 Richard Munz Dispositif de nettoyage du blanchet dans une presse d'impression
US6561095B1 (en) * 1998-12-31 2003-05-13 Koenig & Bauer Aktiengesellschaft Device for cleaning a roller
US20020139268A1 (en) * 2001-03-27 2002-10-03 Emery David Crowell Apparatus for selectively cleaning a printing press cylinder
DE10149843A1 (de) * 2001-10-10 2003-04-17 Hermeling Gerhard Abdeckhaube für ein Druckwerk
US20030167948A1 (en) * 2002-03-05 2003-09-11 Weitz Martin J. Method and apparatus for steam cleaning anilox inking rollers
EP1502740A2 (fr) * 2003-07-26 2005-02-02 MAN Roland Druckmaschinen AG Dispositif pour l'aspiration dans un système d'encrage

Also Published As

Publication number Publication date
EP1661703A3 (fr) 2006-06-07
NL1027297C1 (nl) 2006-04-20

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