EP0246100A2 - Einrichtung zur Verhinderung der Ablösung einer Bahn oder eines Bogens von einem drehenden Zylinder - Google Patents

Einrichtung zur Verhinderung der Ablösung einer Bahn oder eines Bogens von einem drehenden Zylinder Download PDF

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Publication number
EP0246100A2
EP0246100A2 EP87304295A EP87304295A EP0246100A2 EP 0246100 A2 EP0246100 A2 EP 0246100A2 EP 87304295 A EP87304295 A EP 87304295A EP 87304295 A EP87304295 A EP 87304295A EP 0246100 A2 EP0246100 A2 EP 0246100A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
substrate
assembly
assembly according
plate
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Withdrawn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
EP87304295A
Other languages
English (en)
French (fr)
Other versions
EP0246100A3 (de
Inventor
Ronald Edward Knight
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.)
Wallace Knight Ltd
Original Assignee
Wallace Knight Ltd
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 Wallace Knight Ltd filed Critical Wallace Knight Ltd
Publication of EP0246100A2 publication Critical patent/EP0246100A2/de
Publication of EP0246100A3 publication Critical patent/EP0246100A3/de
Withdrawn legal-status Critical Current

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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
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F25/00—Devices for pressing sheets or webs against cylinders, e.g. for smoothing purposes

Definitions

  • the present invention relates to an assembly for preventing the detachment of a substrate from a revolving cylinder, and in particular, but not exclusively from a revolving cylinder in a printing press.
  • a typical printing press comprises a succession of colour units each of which coats a different coloured coating on a substrate passing through the press.
  • Each colour unit comprises a blanket cylinder for applying the coating e.g. ink, varnish or the like to the substrate and an impression cylinder on which the substrate is carried into contact with the blanket cylinder.
  • Each pair of impression and blanket cylinders has a nip between them through which the substrate passes during printing.
  • the substrate e.g. paper or cardboard
  • the substrate e.g. paper or cardboard
  • the tail-end of the substrate because of the tendency of the substrate to regain its usual planar shape.
  • This particular problem is known as tail-end fliok-up, and is particularly acute if another body such as a drying unit is present adjacent to the downstream side of the nip as the detached substrate may rub against this causing the smudging of the freshly applied coating.
  • Drying units normally include a U-V lamp together with a focussing arrangement mounted adjacent to the face of the impression cylinder after the nip between the cylinders.
  • the radiation from the lamp is directed towards the cylinder to dry the coating on the substrate as it passes beneath the unit. If the tail-end of the substrate flicks up as it leaves the nip between the blanket and the impression cylinders, then it is likely to drag along the- undersurface of the drying unit resulting in the coating being smudged or smeared.
  • drying units also leads to the additional problem of overheating the cylinders at which they are directed, resulting in substrate distortion and an increase in the risk of press damage.
  • one proposal has been to extract the air from between the U-V lamp and the impression cylinder. Unfortunately this increases the problem of tail-end flick-up as it also has the effect of drawing the substrate away from the surface of the impression cylinder because of the partial vacuum produced.
  • the present invention aims to overcome the problem of tail-end flick-up by providing an assembly which helps to retain the substrate in place on the impression cylinder.
  • the present invention provides an assembly for preventing the detachment of a substrate from a revolving cylinder comprising means for maintaining or intermittently providing a zone of pressurised gas over at least a part of the path of the substrate on the cylinder.
  • the assembly further comprises a U-V lamp for drying the substrate as it passes under the assembly.
  • a quartz window may be mounted in front of the lamp to prevent cold air from being blown onto it, and to help retain the air pressure built-up between the assembly and the cylinder.
  • the present invention provides a printing press comprising a plurality of colour units, at least one of said units having a blanket cylinder and an impression cylinder including a nip therebetween, and an assembly as hereinbefore described mounted adjacent to the surface of the impression cylinder downstream of the nip for preventing the detachment of a substrate as it emerges from the nip.
  • the press comprises a series of colour units 2 each of which in turn comprises a blanket cylinder 3 for applying the coating (e.g. ink, varnish or the like) to the substrate (e.g. paper, cardboard or the like) and an impression cylinder 4 on which the substrate is carried into contact with the blanket cylinder.
  • the coatings applied to the substrate are those which may be dried by the radiation from a U-V lamp, such as U-V inks or specially formulated varnishs.
  • transfer cylinders 5 are provided between them.
  • the substrate is fed from one colour unit to the next and hence through the printing press by the rotation of the cylinders i.e. from cylinder B to cylinder C to cylinder D etc.
  • the arrangement of cylinders 3 and 4 often results in the substrate detaching itself from the impression cylinder 4 as it leaves the nip between them. It is particularly common for the tail-end of the substrate to become detached as it emerges from the nip, resulting in the previously described problem of tail-end flick-up.
  • the invention provides, in one aspect, an anti-detachment assembly 10 located just downstream of the nip. As will be appreciated from Figure 1, access to the path of the substrate 6 upon the impression cylinder 4 is limited, and therfore the anti-detachment assembly needs to be of compact design particularly where it faces the cylinder.
  • FIG 2 this illustrates an anti-detachment assembly 10 according to one aspect of the invention.
  • the assembly comprises an elongate plate 12 whose major axis runs parallel to that of the adjacent cylinder 4.
  • the plate has a substantially arcuate cross- section, having a cylindrical, or substantially cylindrical e.g. faceted, form.
  • the radius of the arc is selected to be slightly greater than the radius of the cylinder with which it is to be used so that there is a substantially constant separation between them.
  • the assembly 10 will be mounted so that the separation between the cylinder and plate is between about 5-15 mm, and more typically between about 6-8 mm.
  • the plate has a plurality of perforations through its thickness in the form of orifices 14 formed throughout its body.
  • a substantially air-tight canopy 16 having an inlet 15 is formed over the plate to define a space 17 therebetween.
  • a source of compressed gas 18, for instance a compressor, is connected to the inlet to supply gas to the space 17.
  • gas supplied will be air, though other gases can be used if the situation demands.
  • the substrate emerges from the nip 8 attached to cylinder 4.
  • the compressor supplies air under pressure to the inlet 15 of the canopy which is then expelled as indicated by arrows A through the orifices 14. These streams of air press the substrate against the cylinder 4, and thus prevent its detachment. In particular, the assembly prevents tail-end flick-up.
  • the air may be continuously supplied from the compressor 18 so that, according to one embodiment of the invention, air is continuously expelled from the orifices 14.
  • the printing press housing the assembly includes sensors which sense the position of the substrate or substrates within it. These sensors can be used to control, amongst other things,.the compressor 18, and to actuate it only when a substrate, or the tail end of a substrate is about to emerge from the nip 8.
  • FIGS 3 and 4 illustrate an assembly according to a further aspect of the invention for preventing the detachment of a substrate from a cylinder which further includes an elongate U-V lamp 22 for drying the coating on the substrate as it passes under the assembly.
  • the U-V lamp 22 is located within the canopy 16, and is backed by an elongate aluminium reflector 24 which focuses the radiation from the lamp towards the surface of cylinder 4 through an elongate slit 26 formed in the plate 12.
  • the axis of the lamp and slit both extend parallel to the axis of the cylinder.
  • the assembly 10 extends along the whole length of cylinder 4 so that it is able to dry substrates having a width of up to the whole length of the cylinder.
  • a quartz window may be mounted across the slit 26. This prevents both the air which is released from orifices 14 from cooling the UV lamp and also air escaping from between the plate and the cylinder.
  • the substrate 20 emerges from the nip between cylinders 3 and 4 in contact with the impression cylinder 4.
  • the substrate then passes under the UV lamp 22 and the coating which has been applied to its surface by the blanket cylinder 3 is dried by radiation from the U-V lamp.
  • the air which is expelled from the orifices also helps to cool the surface of the revolving cylinder preventing it from overheating. This effect can be reinforced by pre-cooling or refrigerating the air prior to it being expelled from the orifices. This can be achieved by using a modified compressor 18 which also acts to cool the air it compresses.
  • the arrows A indicate the flow of air within the canopy and through the orifices 14 in the plate 12.
  • the pressurised air is introduced into the canopy through an inlet 15 which extends substantially along the length of the assembly.
  • cooling water may be circulated through the reflector by means of inlet and outlet pipes 32 through hollows 30 formed within it.
  • UV lamps produce ozone.
  • This gas has to be extracted from the assembly and safely disposed of due to its toxicity.
  • an additional vent 34 may be formed integrally with the canopy.
  • the vent is open to the atmosphere at one end of the canopy and has a negative pressure applied to its other end resulting in the ozone being extracted from the canopy and into the vent, through a slot 32 as indicated by arrows 0.
  • the ozone is then circulated to disposal means on reaching the end of the vent.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Methods (AREA)
  • Drying Of Solid Materials (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Actuator (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP87304295A 1986-05-14 1987-05-14 Einrichtung zur Verhinderung der Ablösung einer Bahn oder eines Bogens von einem drehenden Zylinder Withdrawn EP0246100A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08611770A GB2190364A (en) 1986-05-14 1986-05-14 An assembly for preventing the detachment of a substrate from a revolving cylinder
GB8611770 1986-05-14

Publications (2)

Publication Number Publication Date
EP0246100A2 true EP0246100A2 (de) 1987-11-19
EP0246100A3 EP0246100A3 (de) 1989-03-08

Family

ID=10597866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304295A Withdrawn EP0246100A3 (de) 1986-05-14 1987-05-14 Einrichtung zur Verhinderung der Ablösung einer Bahn oder eines Bogens von einem drehenden Zylinder

Country Status (2)

Country Link
EP (1) EP0246100A3 (de)
GB (1) GB2190364A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0673767A1 (de) * 1994-03-24 1995-09-27 Heidelberger Druckmaschinen Aktiengesellschaft Leiteinrichtung für bewegtes Bogenmaterial in Druckmaschinen
EP0718430A1 (de) * 1994-12-23 1996-06-26 FLAINOX S.r.l. Tuchveredelungsmaschine
FR2735719A1 (fr) * 1995-06-24 1996-12-27 Heidelberger Druckmasch Ag Dispositif destine a bien mettre en appui un substrat d'impression contre son support dans une machine a imprimer
EP0922574A1 (de) * 1997-11-29 1999-06-16 MAN Roland Druckmaschinen AG Bogenführungseinrichtung in einer Druckmaschine
CN1078848C (zh) * 1995-12-20 2002-02-06 Kba-普兰尼塔公开股份有限公司 印张暂存滚筒上印张的引导装置
EP1201428A2 (de) * 2000-10-26 2002-05-02 Koenig & Bauer Aktiengesellschaft Bogenleiteinrichtung in Druckmaschinen zur Unterstützung der Bogenführung
EP1306212A1 (de) * 2001-10-24 2003-05-02 Koenig & Bauer Aktiengesellschaft Einrichtung zur Bedruckstoff- und Druckwerkskühlung mittels gekühlter Blasluft an Bogenrotationsdruckmaschinen
CN101479107B (zh) * 2006-06-23 2011-01-26 奥梅特有限公司 具有上墨条带的干燥、脱干、聚合和/或加热装置的苯胺印刷机
EP3745024A4 (de) * 2018-03-23 2021-07-28 IUCF-HYU (Industry-University Cooperation Foundation Hanyang University) Reflektor und diesen enthaltende lichtsintervorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6378425B1 (en) * 1995-02-01 2002-04-30 Heidelberger Druckmaschinen Ag Sheet-guiding device for printing presses

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867256A (en) * 1928-05-19 1932-07-12 Egli Arnold Method of and apparatus for drying sheets in multicolor intaglio printing
DE583479C (de) * 1932-03-13 1933-09-04 Albert Schnellpressen Blasvorrichtung an Druckmaschinen, insbesondere an Rotationstiefdruckmaschinen
DE1629075A1 (de) * 1965-04-27 1971-01-14 Buettner Schilde Haas Ag Trocknung einseitig bedruckter Papierbogen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH639623A5 (de) * 1979-06-23 1983-11-30 Winkler Duennebier Kg Masch Einrichtung zum transportieren von flaechenhaften teilen, insbesondere papierblaettern, karten, brief- oder versandhuellen.
DE3422443C2 (de) * 1984-06-16 1989-11-23 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Folie für bogenführende Zylinder und Trommeln in Rotations-Offsetdruckmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867256A (en) * 1928-05-19 1932-07-12 Egli Arnold Method of and apparatus for drying sheets in multicolor intaglio printing
DE583479C (de) * 1932-03-13 1933-09-04 Albert Schnellpressen Blasvorrichtung an Druckmaschinen, insbesondere an Rotationstiefdruckmaschinen
DE1629075A1 (de) * 1965-04-27 1971-01-14 Buettner Schilde Haas Ag Trocknung einseitig bedruckter Papierbogen

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4410189A1 (de) * 1994-03-24 1995-09-28 Heidelberger Druckmasch Ag Leiteinrichtung für bewegtes Bogenmatrial in Druckmaschinen
US5546858A (en) * 1994-03-24 1996-08-20 Heidelberger Druckmaschinen Aktiengesellschaft Printing press
EP0673767A1 (de) * 1994-03-24 1995-09-27 Heidelberger Druckmaschinen Aktiengesellschaft Leiteinrichtung für bewegtes Bogenmaterial in Druckmaschinen
US5608955A (en) * 1994-12-23 1997-03-11 Flainox S.R.L. Fabric finishing machine with air-jet fabric to drum entrainer
EP0718430A1 (de) * 1994-12-23 1996-06-26 FLAINOX S.r.l. Tuchveredelungsmaschine
DE19523076C2 (de) * 1995-06-24 2003-11-20 Heidelberger Druckmasch Ag Vorrichtung zur Erzielung einer einwandfreien Auflage eines Bedruckstoffs in einer Druckmaschine
DE19523076A1 (de) * 1995-06-24 1997-01-02 Heidelberger Druckmasch Ag Vorrichtung zur Erzielung einer einwandfreien Auflage eines Bedruckstoffs in einer Druckmaschine
US5706726A (en) * 1995-06-24 1998-01-13 Heidelberger Druckmaschinen Ag Device for achieving a flawless application of printing stock in a printing press
FR2735719A1 (fr) * 1995-06-24 1996-12-27 Heidelberger Druckmasch Ag Dispositif destine a bien mettre en appui un substrat d'impression contre son support dans une machine a imprimer
DE19523076C5 (de) * 1995-06-24 2007-05-16 Heidelberger Druckmasch Ag Vorrichtung zur Erzielung einer einwandfreien Auflage eines Bedruckstoffs in einer Druckmaschine
CN1078848C (zh) * 1995-12-20 2002-02-06 Kba-普兰尼塔公开股份有限公司 印张暂存滚筒上印张的引导装置
EP0922574A1 (de) * 1997-11-29 1999-06-16 MAN Roland Druckmaschinen AG Bogenführungseinrichtung in einer Druckmaschine
EP1201428A2 (de) * 2000-10-26 2002-05-02 Koenig & Bauer Aktiengesellschaft Bogenleiteinrichtung in Druckmaschinen zur Unterstützung der Bogenführung
EP1201428A3 (de) * 2000-10-26 2007-04-18 Koenig & Bauer Aktiengesellschaft Bogenleiteinrichtung in Druckmaschinen zur Unterstützung der Bogenführung
EP1306212A1 (de) * 2001-10-24 2003-05-02 Koenig & Bauer Aktiengesellschaft Einrichtung zur Bedruckstoff- und Druckwerkskühlung mittels gekühlter Blasluft an Bogenrotationsdruckmaschinen
US6983696B2 (en) 2001-10-24 2006-01-10 Koenig & Bauer Ag Apparatus for cooling material to be printed and printing units at sheet fed printing machines with cooled compressed air
CN101479107B (zh) * 2006-06-23 2011-01-26 奥梅特有限公司 具有上墨条带的干燥、脱干、聚合和/或加热装置的苯胺印刷机
EP3745024A4 (de) * 2018-03-23 2021-07-28 IUCF-HYU (Industry-University Cooperation Foundation Hanyang University) Reflektor und diesen enthaltende lichtsintervorrichtung

Also Published As

Publication number Publication date
GB8611770D0 (en) 1986-06-25
GB2190364A (en) 1987-11-18
EP0246100A3 (de) 1989-03-08

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Inventor name: KNIGHT, RONALD EDWARD