EP0548501B1 - Dispositif pour le nettoyage d'un cylindre d'impression flexographique - Google Patents

Dispositif pour le nettoyage d'un cylindre d'impression flexographique Download PDF

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Publication number
EP0548501B1
EP0548501B1 EP92118318A EP92118318A EP0548501B1 EP 0548501 B1 EP0548501 B1 EP 0548501B1 EP 92118318 A EP92118318 A EP 92118318A EP 92118318 A EP92118318 A EP 92118318A EP 0548501 B1 EP0548501 B1 EP 0548501B1
Authority
EP
European Patent Office
Prior art keywords
rotating body
cleaning
cleaning material
forme cylinder
gap
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.)
Expired - Lifetime
Application number
EP92118318A
Other languages
German (de)
English (en)
Other versions
EP0548501A1 (fr
Inventor
Franz Waizmann
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.)
Baldwin Gegenheimer GmbH
Original Assignee
Baldwin Gegenheimer GmbH
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 Baldwin Gegenheimer GmbH filed Critical Baldwin Gegenheimer GmbH
Publication of EP0548501A1 publication Critical patent/EP0548501A1/fr
Application granted granted Critical
Publication of EP0548501B1 publication Critical patent/EP0548501B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F35/02—Cleaning arrangements or devices for forme cylinders

Definitions

  • the device relates to an object as specified in the preamble of claim 1.
  • the flexographic printing cylinder which carries a relief-like printing form, becomes dirty during the printing process due to contact with the printing material, from which particles pass onto the printing form.
  • the inherently low-viscosity flexographic printing ink with which the flexographic printing cylinder is usually inked by means of an anilox roller, deposits on the bottom of the printing elements in an aging manner.
  • the appearance of the printing form is such that the permanently contacting projecting partial areas of the elastic or partially elastic printing form show largely freely visible material, but dirt is accumulated below the above contact areas.
  • soiling is irrelevant and that the substrate is removed more or less without interference. In raster areas, however, the dirt can clog the printed image or the fine writing.
  • the production printing must therefore be interrupted and the printing form cleaned. Apart from waste, it is then difficult to bring the printing process back into sync.
  • a disadvantage of this measure is the complex provision of the cleaning sheet and the non-harmless passage of the cleaning sheet through the cylinder gap, the cleaning sheet in the worst case not exiting freely from the outlet gap of the cylinders, but getting into the inking unit.
  • the solution includes the installation of a cleaning device opposite the outer surface of the forme cylinder, with which the cleaning material or the cleaning tool can be brought and rolled in the position required for a perfect cleaning of the printing blocks. There is no need to use the pressure gap for the throughput of the cleaning sheet.
  • the handling of the printing material web remains unaffected by the addition of the cleaning device to the forme cylinder. Damage to the printing unit due to undesired introduction of the cleaning sheet into the inking unit is excluded. With the shifting of cleaning to a separate cleaning device, cleaning is limited to an accompanying process in which there is no intervention in the printing nip and in the web processing and accordingly the extent of the overall impairment is inevitably reduced.
  • the rolling of the cleaning material on the printing form allows repeated cleaning contact when the endless material is applied continuously on a cleaning cylinder placed against the forme cylinder.
  • Different diameters of the forme cylinder and cleaning cylinder ensure a shifting coverage of the printing form and the rolling cleaning material that preserves the contours of the printing form.
  • the adjusting body which can be forcibly moved into a rest and working position, can be finely positioned with respect to the working position, as a result of which the adjusting forces of the cleaning material can be adjusted against the printing form.
  • the cleaning material is provided in various ways. When the cleaning material is pulled onto the jacket of a cylindrical rotating body, the use is limited to a certain number of revolutions or rollovers. It is possible to store the cleaning material in web form in the interior of the rotating body on a supply roll and to wind it up on a consumption roll likewise arranged in the interior of the rotating body. By means of external control, the cleaning path running over the outer surface of the rotating body can be successively advanced.
  • a simple clamping device for the cleaning material on the rotating body allows the cleaning device to be loaded from a magazine with cleaning material in stock.
  • the new material is housed in a roll or Z-Z shape in the cassette.
  • the clamping device for the cleaning material consists of a transversely fixed clamping rail arranged below the tip circle of the rotating body, with which the head side of the cleaning material section clamped on the outer surface of the rotating body is clamped. Fixing the cleaning material downwards from the nip is not critical because the section runs on and cannot free itself. However, the flexible cleaning material allows holding by means of pick-up tips, such as with Velcro, or sticking with double-sided adhesive tape. If the cleaning material lies freely on the rotating body after the clamping point, one or more guide rollers can be arranged, which ensure that the cleaning material is pressed down onto the outer surface of the rotating body.
  • Another form of holding the cleaning material on the rotating body consists of guide slots on the lateral peripheral edges of the rotating body, into which the side edges of the cleaning material are inserted and then held in their position.
  • the structure with guide slots on the peripheral edges of the rotating body is suitable for automated lifting of the cleaning material onto the rotating body.
  • roller mill in relation to the forme cylinder, the roller mill serving as a transport device for the curved or endless, loop-shaped cleaning material.
  • One of the rollers of the roller mill serves as a counter roller to form the cleaning gap with respect to the forme cylinder.
  • the process of the positive connection between the resilient, partially elastic cleaning material and the high-pressure printing form, which itself has a certain deformability, is based on the compression and compression set in the gap inlet, which is followed by the reforming in the outlet gap.
  • a certain permanent deformation and also a certain temporal behavior play a role for the reforming process.
  • Force sensors or optical sensors the signals of which can be fed to a control structure, can be used as a control device for the superimposed readjustment of the rotating body to be carried out during the mutual cylinder adjustment.
  • the flexible cleaning material preferably consists of polyvinyl alcohol.
  • This material can be substituted by similar, foam-like plastics, which are suitable for limited reversible impressions and also in their adhesive properties for flexographic printing inks.
  • One method of restricting the consumption of soiling cleaning material made of relatively voluminous, expensive elastomer is that this elastomer merely forms a soft layer on the rotating body and a thin layer of cleaning tissue is provided for contact with the printing form.
  • the consumable is not the elastomer, but the cleaning fabric. It sits tubularly on the rotating body or is unwound as a thin web.
  • An arrangement for this shows the processing with two rollers inside the rotating body and the fabric literally as an elevator on the cleaning cylinder, another arrangement consists of an unwinding arrangement external to the cleaning cylinder.
  • the take-up roll and the supply roll are on both sides of the cleaning gap.
  • the thin layer of the dirt track must be moved at the peripheral speed of the forme cylinder.
  • the printing unit shown in FIG. 1 is a printing unit of a flexographic printing machine, in which a printing material web 4 is printed with a flexographic plate 1.1 seated on a forme cylinder 1.
  • the inking takes place via an inking and immersion roller 3.
  • the printing nip exists between the forme cylinder 1 and a printing cylinder 2.
  • the printing unit can be reversed. Particles from the printing material web 4 and from ink settling in the flexo plate 1.1 deteriorate the printing result over time.
  • a rotating body 5 is arranged parallel to the axis of the forme cylinder 1 and can be rotated about the axis 5.1 by means of a drive (not shown) and can be set against the flexographic plate 1.1.
  • the peripheral speed of the rotating body 5 is matched to the peripheral speed of the forme cylinder 1.
  • the axis 5.1 between a rest position A and an operating position B, in which the rotating body 5 is set against the forme cylinder 1, is displaceable.
  • the shift takes place with the help of an eccentric adjusted by a servo cylinder.
  • a pin connected to the positioning curve can be moved against an adjustable, adjustable stop C.
  • the stop C during the cleaning process in which the Cleaning material 7 is pressed against the flexo plate 1.1, can be moved by means of a fine adjustment 19.
  • a displacement of the stop C which is superimposed on the engagement process permits a corresponding swelling increasing or decreasing impression of the cleaning material 7, which can be programmed depending on the cleaning requirements.
  • the frame-fixed bracket for massive adjustment of the rotating body 5 against the forme cylinder 1 is created by a suspension 6.
  • the clamping of new versus old sections of cleaning material 7 around the circumference of the rotating body 5 is possible with a tensioning shoe 9, which holds the front edge of the section, that is to say the inlet side, in a slot and fastens it to the rotating body 5.
  • the front edge is also bent and held by the part above the slot by a radial movement of the tensioning shoe 9 towards the axis 5.1.
  • the front is ejected by moving the tensioning shoe 9 outwards.
  • Guide rollers 8 serve to hold down the cleaning material 7 on the rotating body 5.
  • FIG. 3b shows a solution in which the cleaning material 7 can be renewed piece by piece via a take-up roll 10 arranged internally in the rotating body 5 with a supply roll 11 on the circumference of the rotating body 5.
  • the cleaning device When the cleaning device is operating, there is a synchronous speed between the rotating body 5 or cleaning material 7 and the peripheral speed of the forme cylinder 1, including a feed of the cleaning material 7 by rotating the winding roller 10.
  • the cleaning material 7 can only be advanced relative to the surface of the rotating body 5 during operation only when the channel section is passing through.
  • the arrangement tolerates slight slippage between the cleaning material 7 and the flexo plate 1.1 if the cleaning material 7 is slowly advanced on the outer surface of the rotating body 5.
  • a winding drive 12 For a feed from rotation to rotation or from cleaning cycle to cleaning cycle, a winding drive 12 is provided which can be operated manually or automatically.
  • the winding drive 12 engages the core of the winding roll 10 via a gear.
  • the 3a can be loaded from a magazine 13 in which a plurality of sections of the cleaning material 7 are stacked. After a section has been placed on the tensioning shoe 9, the section is either fastened to the lateral surface of the rotating body 5 or the section is conveyed into the cleaning gap 18 by a feed movement which is brought about by rotation of an arranged feed roller 14.1 and the rotating body 5. To remove the section of cleaning material 7 from the outlet gap between the rotating body 5 and the flexo plate 1.1, there is a removal roller 14.2 near the surface of the forme cylinder, the direction of rotation of which opposite to that of the forme cylinder 1 results in a repelling effect.
  • the supply and discharge of the cleaning material 7 into the cleaning gap 18 or to the clamping point of the rotating body 5 is controlled by guiding devices 20.
  • a loop 17 is indicated, which shows the use of the cleaning material 7 in endless form.
  • the loop 17 has the advantage of a material offering in which a relatively large amount of new material for lubricating the dirt is offered by the flexo cliché 1.1.
  • an elastic or partially elastic coating 16 can be applied to the rotating body 5, which coating is pressed against the flexographic plate 1.1 on contact. Between the coating 16 and the flexo cliché 1.1, a waste fabric 15 pulled off at synchronous speed is moved. With regard to the stretching of the waste fabric 15, the guidance of the speed is the Take-up roll 10 can be tolerated by means of a take-up drive (not shown), which relates to deviations in the speed of the abrasive fabric 15 compared to the peripheral speeds of the rotating body 5 and the forme cylinder 1.
  • the desired offset between the cliché 1.1 and the cleaning material 7, with which the same coincidence of parts of both surfaces is to be avoided, is achieved with the uneven, odd diameter ratio given for the rotating body 5 and forme cylinder 1.
  • the arrangement of an axially acting traversing mechanism on the axis 5.1 of the rotating body (not shown) provides additional offset in the axial direction to avoid rolling of the same surface parts.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (11)

  1. Dispositif pour le nettoyage d'un cylindre de cliché à cliché en relief, en utilisant un matériau de nettoyage flexible pouvant être amené en contact contre le cliché en relief dans une fente d'application, caractérisé en ce qu'un corps de rotation (5) entraîné en rotation est disposé en parallélisme axial au cylindre de cliché (1) et peut être déplacé dans une position de repos (A) et dans une position de travail (B) contre le cylindre de cliché (1), corps auquel est associé un dispositif de maintien et de guidage (8, 9) pour le matériau de nettoyage (7) qu'on peut faire passer par la fente (18) entre le corps de rotation (5) et le cylindre de cliché (1), en ce que le corps de rotation (5) présente sensiblement la même vitesse circonférentielle que le cylindre de cliché (1), et en ce que la distance d'axe en axe entre le corps de rotation (5) et le cylindre de cliché (1) dans la position de travail (B) peut être modifiée par un réglage fin associé (19).
  2. Dispositif selon la revendication 1, caractérisé en ce que le diamètre du corps de rotation (5) est différent du diamètre du cylindre de cliché (1).
  3. Dispositif selon les revendications 1 et 2, caractérisé en ce qu'un tronçon du matériau de nettoyage (7) peut être tendu sur le corps de rotation (5).
  4. Dispositif selon les revendications 1 et 2, caractérisé en ce que sont prévus, à côté du dispositif de nettoyage, un dispositif d'alimentation ainsi qu'un dispositif d'évacuation (10, 11, 14.1, 14.2, 20) pour le matériau de nettoyage (7) par rapport au corps de rotation (5) ou encore à la fente de nettoyage (18).
  5. Dispositif selon la revendication 4, caractérisé en ce que le corps de rotation (5) peut être dévidé et renvidé à l'intérieur du corps de rotation (5), et en ce que l'avancement du matériau de nettoyage (7) relativement à la face d'enveloppe du corps de rotation (5) présente un mécanisme extérieur (12) qui peut être actionné lorsque le corps de rotation (5) est arrêté ou lorsqu'il tourne en service.
  6. Dispositif selon les revendications 3 et 4, caractérisé en ce qu'un dispositif d'alimentation (13) pour le matériau de nettoyage (7) à apporter est disposé sur le côté d'entrée de la fente (18) entre le corps de rotation (5) et le cylindre de cliché (1), et un dispositif de réception pour le matériau de nettoyage (7) à évacuer est disposé sur le côté de sortie de la fente.
  7. Dispositif selon les revendications 4 et 6, caractérisé en ce que le matériau de nettoyage (7) peut être apporté à la fente de nettoyage (18) au moyen d'un guidage d'introduction présentant une paire de cylindres d'entrée (5, 14.1), et peut être transporté hors de la fente de nettoyage (18) dans le dispositif de réception à l'aide d'un guidage d'évacuation (5, 14.2, 20).
  8. Dispositif selon la revendication 7, caractérisé en ce que le matériau de nettoyage forme une boucle (17) entre la paire de cylindres d'entrée (5, 14.1) et le guidage d'évacuation (5, 14.2, 20).
  9. Dispositif selon la revendication 1, caractérisé en ce que le corps de rotation (5) peut être déplacé en direction axiale, un déplacement périodique ou par intervalles pouvant être fourni.
  10. Dispositif selon la revendication 1, caractérisé par un matériau de nettoyage flexible constitué d'une couche inférieure (16) d'élastomère compressible et une couche superposée de tissu mince (15) remplaçable ou dévidable.
  11. Dispositif selon les revendications 6 et 10, caractérisé en ce que la couche (16) d'élastomère est reliée au corps de rotation (5), et la couche mince de tissu (15) peut être dévidée du dispositif d'alimentation (11) sur le dispositif de réception (10) à une vitesse approximativement égale à la vitesse circonférentielle du cylindre de cliché (1).
EP92118318A 1991-12-20 1992-10-27 Dispositif pour le nettoyage d'un cylindre d'impression flexographique Expired - Lifetime EP0548501B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4142421 1991-12-20
DE4142421A DE4142421A1 (de) 1991-12-20 1991-12-20 Vorrichtung zum reinigen von flexodruckzylindern

Publications (2)

Publication Number Publication Date
EP0548501A1 EP0548501A1 (fr) 1993-06-30
EP0548501B1 true EP0548501B1 (fr) 1996-01-03

Family

ID=6447781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118318A Expired - Lifetime EP0548501B1 (fr) 1991-12-20 1992-10-27 Dispositif pour le nettoyage d'un cylindre d'impression flexographique

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EP (1) EP0548501B1 (fr)
DE (2) DE4142421A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10226148A (ja) * 1997-02-17 1998-08-25 Heidelberger Druckmas Ag 非吸収性の物質を多色印刷する方法
DE102009000862B4 (de) 2009-02-13 2011-05-05 Koenig & Bauer Aktiengesellschaft Reinigungsvorrichtung eines Farbwerks und ein Verfahren zum Reinigen zumindest einer Walze eines Farbwerks
CN104417045B (zh) * 2013-08-20 2017-03-22 北大方正集团有限公司 一种在线辊体清洁装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE675305C (de) * 1936-08-11 1939-05-05 Friedrich Von Heinrich Dr Ing Wischvorrichtung fuer Kupferdruckpressen
US3545381A (en) * 1968-02-20 1970-12-08 Procter & Gamble Method of cleaning printing surfaces after printing soft tissue paper
GB1284888A (en) * 1968-09-06 1972-08-09 Sisenca Sa Improvements in or relating to devices for cleaning printing machines
FR2284452A1 (fr) * 1974-09-11 1976-04-09 Carnaud & Forges Dispositif destine aux machines a imprimer, utilisable notamment lors de la mise en marche de ces dernieres
US4344361A (en) * 1979-04-19 1982-08-17 Baldwin-Gegenheimer Corporation Automatic blanket cylinder cleaner
JPH0814740B2 (ja) * 1986-10-17 1996-02-14 日立工機株式会社 定着ローラの清掃装置
DD259600A1 (de) * 1987-04-10 1988-08-31 Polygraph Leipzig Einrichtung zum waschen eines zylinders einer druckmaschine

Also Published As

Publication number Publication date
DE4142421A1 (de) 1993-06-24
EP0548501A1 (fr) 1993-06-30
DE59204928D1 (de) 1996-02-15

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