EP0308663A2 - Dispositif de mouillage d'une machine rotative - Google Patents

Dispositif de mouillage d'une machine rotative Download PDF

Info

Publication number
EP0308663A2
EP0308663A2 EP88113640A EP88113640A EP0308663A2 EP 0308663 A2 EP0308663 A2 EP 0308663A2 EP 88113640 A EP88113640 A EP 88113640A EP 88113640 A EP88113640 A EP 88113640A EP 0308663 A2 EP0308663 A2 EP 0308663A2
Authority
EP
European Patent Office
Prior art keywords
metering
roller
dampening
rollers
hardness
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
EP88113640A
Other languages
German (de)
English (en)
Other versions
EP0308663B1 (fr
EP0308663A3 (en
Inventor
Hans-Jürgen Kusch
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0308663A2 publication Critical patent/EP0308663A2/fr
Publication of EP0308663A3 publication Critical patent/EP0308663A3/de
Application granted granted Critical
Publication of EP0308663B1 publication Critical patent/EP0308663B1/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
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • the invention relates to a dampening unit for offset rotary printing presses with a scoop roller which is partially immersed in the dampening fluid, with subsequent rollers which transfer the dampening fluid to the printing plate and with an elastic metering agent which interacts with the scoop roller.
  • Such a dampening unit is shown in DE-PS 20 54 678, in which a scoop roller is assigned a metering roller for metering the amount of dampening solution to be transferred to the printing plate.
  • metering rollers are provided with an elastic jacket surface and are placed on the scoop roller via an eccentric bearing in order to squeeze out the dampening solution and thus reduce it. It has now been found that the metering range of the metering roller does not correspond to practical requirements in the case of such a dampening unit. Depending on the hardness of the metering roller you have z. B. at high printing speed too much dampening solution and there is a pale print and the color tends to emulsify.
  • the dampening solution is squeezed off sufficiently with a hard metering roller to avoid excess water on the printing plate. If the printing speed is slow, the pressure must be reduced in order to be able to transport sufficient dampening solution. Even a very low pressure with a hard metering roller can interrupt the dampening solution supply. With a soft metering roller, too much dampening solution is conveyed at high printing speeds despite high pressure. At a low printing speed, the pressure of a soft metering roller can be adjusted so that sufficient dampening solution is conveyed.
  • the object is achieved in that two or more metering rollers with elastic jacket surfaces are provided as metering means, the jacket surfaces of which have different degrees of hardness, the metering rollers being alternately adjustable against the scoop roller, such that metering rollers with a higher degree of hardness are employed with increasing printing speed .
  • this solution it is achieved that, for. B. when using two or three metering rollers at low speed a metering roller with a relatively soft outer surface is placed against the scoop roller and a metering roller with a higher degree of hardness is set as the machine speed increases. This allows the dampening solution on the scoop roller to be reduced as much as is necessary for the respective printing work, even at higher hydrodynamic pressures.
  • the subclaims characterize advantageous embodiments of the invention, the means provided permitting a continuous transfer of the pressure from the hard to the soft metering roller and vice versa, or, if desired, also allowing the metering rollers to be changed in stages.
  • the position of the individual metering rollers can be adjusted very precisely via the provided eccentric. If an electric motor is used to actuate the eccentric, the control of the electric motor can be derived from the speed control of the machine.
  • FIGS. 1 and 2 show a plate cylinder 1 to which an application roller 2 with an elastic jacket surface is assigned.
  • the application roller 2 in turn is assigned four rollers 3, 4, 5, 6 of an inking unit, not shown.
  • the applicator roller 2 is assigned a roller 7 of the dampening unit 8, which is supplied by a scoop roller 9 and an intermediate roller 10.
  • the scoop roller 9 is partially immersed in the Moist liquid 11, which is provided in a liquid container 12.
  • the scoop roller 9 is assigned two metering rollers 13, 14, which have an elastic jacket surface.
  • the metering roller 13 is provided with a rubber jacket surface which has a degree of hardness of 50 to 60 shore.
  • the metering roller 14 is formed with a softer rubber jacket surface of 30 to 40 degrees of hardness.
  • Each metering roller 13, 14 is supported on both sides in an angle lever 15, 16, which is pivotally attached to a lever 19 with a lever arm 17, 18, which in turn is arranged on the machine side frame. This makes it possible to either apply the metering roller 13 or the metering roller 14 to the scoop roller 9.
  • the stops 22 can be z. B. adjust via set screws 23 and secure using lock nuts 24.
  • the stops 22 fall on eccentric 25, 26, which are attached to an axis 27.
  • the positioning eccentric 25 is assigned to the roller 13 according to the exemplary embodiment shown and the positioning eccentric 26 to the metering roller 14.
  • the axis 27 can be attached to a metering lever 28 z. B. pivot by 90, so that the metering roller 13 or the metering roller 14 can be turned on the scoop roller 9, wherein the eccentric can be designed so that there is a certain transition phase in which the one metering roller is relieved and the other is loaded .
  • the setting pressure of the individual metering rollers 13, 14 on the scoop roller 9 can also be infinitely adjusted via the metering lever 28 and the adjusting eccentrics 25, 26.
  • a servomotor can be arranged on the axis 27 with the adjusting eccentrics 25 and 26, which actuates the metering roller 14 with a soft rubber jacket surface at low speed and the metering roller 13 with a hard rubber jacket surface at the scoop roller 9 at a higher machine speed.
  • the control circuit of such a servomotor can be derived from the machine control itself in two or more speed levels of the printing press.
  • metering rollers can be used with different hydrodynamic forces of the dampening solution according to the respective machine speed, which are able to carry out an exact metering of the amount of dampening solution without excessive contact pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP88113640A 1987-09-22 1988-08-23 Dispositif de mouillage d'une machine rotative Expired - Lifetime EP0308663B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3731768 1987-09-22
DE3731768A DE3731768C1 (de) 1987-09-22 1987-09-22 Feuchtwerk fuer Rotations-Offsetdruckmaschinen

Publications (3)

Publication Number Publication Date
EP0308663A2 true EP0308663A2 (fr) 1989-03-29
EP0308663A3 EP0308663A3 (en) 1989-05-17
EP0308663B1 EP0308663B1 (fr) 1991-08-21

Family

ID=6336527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113640A Expired - Lifetime EP0308663B1 (fr) 1987-09-22 1988-08-23 Dispositif de mouillage d'une machine rotative

Country Status (5)

Country Link
US (1) US4872406A (fr)
EP (1) EP0308663B1 (fr)
JP (1) JPH0667611B2 (fr)
AU (1) AU2061688A (fr)
DE (2) DE3731768C1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH069939U (ja) * 1991-12-27 1994-02-08 リョービ株式会社 オフセット印刷機の連続給水装置
DE4230937A1 (de) * 1992-09-16 1994-03-17 Heidelberger Druckmasch Ag Einrichtung zum Ein- und Auskuppeln von Farb- und Feuchtwerkantrieb
DE19501146C1 (de) * 1995-01-17 1996-04-25 Roland Man Druckmasch Feuchtwerk
IES80636B2 (en) * 1997-06-05 1998-10-21 Richard Harrington Improvements relating to printing
DE19800475A1 (de) * 1998-01-09 1999-07-15 Koenig & Bauer Ag Verfahren und Einrichtung zur Beeinflussung der Farbverteilung
DE10008488A1 (de) * 1999-03-17 2000-09-21 Heidelberger Druckmasch Ag Feuchtwerk einer Flachdruckmaschine
US6101940A (en) * 1999-08-13 2000-08-15 Ward Holding Co., Inc. Printing machine
US6336403B1 (en) 2000-04-05 2002-01-08 Townsend Industries, Inc. Dampening system for printing machines
DE10152466B4 (de) * 2000-11-24 2015-12-17 Heidelberger Druckmaschinen Ag Feuchteregelung unter Berücksichtigung mehrerer den Druckprozess beeinflussender Größen
DE102007001669C5 (de) * 2007-01-11 2009-08-27 Koenig & Bauer Aktiengesellschaft Feuchtwerk für Offsetdruckmaschine
JP5821487B2 (ja) * 2011-03-09 2015-11-24 株式会社リコー インクジェットプリンタ用先塗り液塗布装置および画像形成システム

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2054678A1 (de) * 1970-11-06 1972-10-26 Roland Offsetmaschinenfabnk Fa ber & Schleicher AG, 6050 Offenbach Feuchtwerk fur lithographische Druckmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038405A (en) * 1959-12-04 1962-06-12 Harris Intertype Corp Lithographic dampening device and method
US3343484A (en) * 1964-12-16 1967-09-26 Harold P Dahlgren Lithographic dampener with skewed metering roller
DE1561113A1 (de) * 1966-12-05 1970-02-12 Winkler Duennebier Kg Masch Feuchtwerk fuer Offsetdruckmaschinen
DE2845932A1 (de) * 1978-10-21 1980-04-24 Heidelberger Druckmasch Ag Kombiniertes feucht-farbwerk fuer offsetdruckwerke

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2054678A1 (de) * 1970-11-06 1972-10-26 Roland Offsetmaschinenfabnk Fa ber & Schleicher AG, 6050 Offenbach Feuchtwerk fur lithographische Druckmaschinen

Also Published As

Publication number Publication date
DE3864361D1 (de) 1991-09-26
AU2061688A (en) 1989-03-23
EP0308663B1 (fr) 1991-08-21
DE3731768C1 (de) 1989-03-23
EP0308663A3 (en) 1989-05-17
JPH01110145A (ja) 1989-04-26
US4872406A (en) 1989-10-10
JPH0667611B2 (ja) 1994-08-31

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