EP2159050A2 - Procédé de fonctionnement d'une machine d'impression à cylindre central - Google Patents

Procédé de fonctionnement d'une machine d'impression à cylindre central Download PDF

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Publication number
EP2159050A2
EP2159050A2 EP09009894A EP09009894A EP2159050A2 EP 2159050 A2 EP2159050 A2 EP 2159050A2 EP 09009894 A EP09009894 A EP 09009894A EP 09009894 A EP09009894 A EP 09009894A EP 2159050 A2 EP2159050 A2 EP 2159050A2
Authority
EP
European Patent Office
Prior art keywords
central cylinder
printing
cylinders
cylinder
impression
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Withdrawn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
EP09009894A
Other languages
German (de)
English (en)
Other versions
EP2159050A3 (fr
Inventor
Gordon Whitelaw
Wolfgang Brusdeilins
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.)
Bobst Bielefeld GmbH
Original Assignee
Fischer and Krecke GmbH and Co KG
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 Fischer and Krecke GmbH and Co KG filed Critical Fischer and Krecke GmbH and Co KG
Publication of EP2159050A2 publication Critical patent/EP2159050A2/fr
Publication of EP2159050A3 publication Critical patent/EP2159050A3/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Withdrawn legal-status Critical Current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
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/008—Mechanical features of drives, e.g. gears, clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/04—Rotary letterpress machines for printing on webs
    • B41F5/16—Rotary letterpress machines for printing on webs for multicolour printing
    • B41F5/18—Rotary letterpress machines for printing on webs for multicolour printing using one impression cylinder co-operating with several forme cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B41F7/10—Rotary lithographic machines for offset printing using one impression cylinder co-operating with several transfer cylinders for printing on sheets or webs, e.g. satellite-printing units

Definitions

  • the invention relates to a method for operating a printing press with a plurality of printing cylinders, which are employed on a common central cylinder.
  • Known gravure printing machines are therefore constructed as multi-stand machines in which a printing cylinder and an associated impression roller is provided in each inking unit, which presses the printing material against the printing cylinder. Only the printing cylinders are actively driven while the impression rollers free.
  • the object of the invention is to provide a method that allows a new operation and use of a central cylinder engine.
  • This object is achieved in that at least in a certain phase of operation during the printing operation, the printing cylinder can be driven and you can run the central cylinder only by frictional engagement with the printing cylinders.
  • a central cylinder machine can be operated with the aid of this method so that there is no slippage between the printing material web and the printing cylinders, since the central cylinder is not actively driven, but only by frictional engagement of the pressure cylinder is taken, so that its peripheral speed is always adapted to the peripheral speed of the impression cylinder.
  • the operation described above is applied only during the printing run when the central cylinder has already reached its target speed.
  • the central cylinder which has a relatively large moment of inertia, is actively driven. This allows a faster acceleration of the central cylinder to the target speed.
  • a central cylinder which has an elastic surface layer on its peripheral surface, and the tolerances in the radii of the individual printing cylinders are compensated by the fact that the impression cylinder are made with elastic deformation of the surface layer of different amounts against the central cylinder.
  • a central cylinder 10 which has on its peripheral surface an elastomeric surface layer 12 and is wrapped by a printing substrate B.
  • Several pressure cylinders 14 are arranged on the circumference of the central cylinder 10 and employed against the central cylinder, that with them various print images, for example, different color separation images, can be successively printed on the substrate web B. So that the repeat is maintained during the printing operation, all printing cylinders 14 are driven at the same speed.
  • FIG. 2 one half of a central cylinder 10 is shown, which has an elastomeric surface layer 12, whose thickness is greatly exaggerated here.
  • a plurality of impression cylinders 14-1, 14-2 and 14-3 are set against the circumference of the central cylinder 10 so far as to slightly depress the elastomeric surface layer 12, again exaggerated in the drawing. Due to this deformation of the surface layer of the central cylinder 10 has at the location of the printing cylinder 14-1 the effective radius R 1, at the location of the printing cylinder 14-2 the effective radius R 2, and the point of the printing cylinder 14-3 the effective radius R 3 ,
  • the radii of the printing cylinders are r 1 , r 2 and r 3 .
  • r 1 and r 3 (at both ends of the respective cylinder) exactly match the nominal radius r of the impression cylinder.
  • k has the unrealistically high value 0.1.
  • the size deviations of the printing cylinders are typically of the order of a few ⁇ m, so that realistic values for k are approximately of the order of 10 -5 .
  • the elastomeric layer 12 is pressed in more strongly here, so that the effective radius R 2 is smaller than the effective radii R 1 and R 3 .
  • the actual radii r 1 of all printing cylinders (the index i identifies the individual printing cylinders) will deviate from the nominal value r, and the axes of all printing cylinders will then be adjusted so that R i / r i has the same value for all i.
  • the impression cylinders may also have a slightly conical shape so that their radius at the opposite ends may be different, the radii are measured at least at both ends of the impression cylinder and the adjustment is made for the opposite ends of the impression cylinders (the opposite sides the printing press) made independently.
  • the effective radii R i of the central cylinder 10 must be proportional to the actual radii r i of the impression cylinders.
  • Fig. 1 shows, for driving the central cylinder 10, an electric motor Mz is provided, which is connected in the example shown via a mechanical coupling 16 with the central cylinder.
  • Each pressure cylinder 14 has its own electric motor Md for driving. All motors Md and Mz and the clutch 16 are controlled by an electronic control unit 18.
  • step S1 the clutch 16 is then engaged, ie, the motor Mz is connected to the central cylinder 10, and the motors Mz and Md are turned on, to accelerate both the central cylinder and the pressure cylinders to their respective desired speeds.
  • the ratio w / W of the angular velocities is kept constant by electronic control of the motors.
  • step S2 it is checked whether the central cylinder 10 has reached its target speed. As long as this is not the case, this step is repeated cyclically. Once the target speed is reached, the clutch 16 is disengaged in step S3, and the motor Mz for the central cylinder 10 is turned off. Thus, only the motors Md remain active for driving the printing cylinders 14, and these motors are controlled so that all printing cylinders run at the same angular velocity w.
  • the central cylinder 10 Due to the frictional engagement between the printing cylinders 14 and the printing substrate B and the frictional engagement of this printing material web with the surface layer 12 of the central cylinder, the central cylinder 10 is maintained at its desired rotational speed. For this purpose, only a very small torque is needed, which compensates for the friction losses. This torque can be easily transferred by friction, so that there is no slippage between the printing cylinders and the printing material.
  • the basis of Fig. 2 and 3 explained employment of the impression cylinder also ensures that all pressure cylinders have the same tendency to keep the central cylinder at the same angular velocity.
  • mechanical coupling 16 can be omitted if the motor Mz has a construction that allows to connect this motor so that it exerts virtually no torque on the rotating central cylinder.
  • either the clutch 16 can be engaged again or the motor Mz can be operated so that it actively brakes the central cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP09009894A 2008-09-02 2009-07-30 Procédé de fonctionnement d'une machine d'impression à cylindre central Withdrawn EP2159050A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810045402 DE102008045402A1 (de) 2008-09-02 2008-09-02 Verfahren zum Betrieb einer Zentralzylinder-Druckmaschine

Publications (2)

Publication Number Publication Date
EP2159050A2 true EP2159050A2 (fr) 2010-03-03
EP2159050A3 EP2159050A3 (fr) 2011-12-21

Family

ID=41429405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09009894A Withdrawn EP2159050A3 (fr) 2008-09-02 2009-07-30 Procédé de fonctionnement d'une machine d'impression à cylindre central

Country Status (2)

Country Link
EP (1) EP2159050A3 (fr)
DE (1) DE102008045402A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19927555A1 (de) * 1999-06-16 2000-12-21 Koenig & Bauer Ag Einrichtung zum Einstellen von Schmitzringen
WO2002074540A1 (fr) * 2001-03-20 2002-09-26 Koenig & Bauer Aktiengesellschaft Procedes et dispositifs pour entrainer une unite d'impression
EP1464488A2 (fr) * 2003-03-03 2004-10-06 Koenig & Bauer Aktiengesellschaft Entraínements d'une unité d'impression
WO2004110761A1 (fr) * 2003-06-17 2004-12-23 Koenig & Bauer Aktiengesellschaft Unites d'impression d'une presse rotative comprenant des bagues de cylindre
DE102006001447A1 (de) * 2006-01-10 2007-07-12 Man Roland Druckmaschinen Ag Satellitendruckeinheit einer Rollenrotationsdruckmaschine
DE102007028699A1 (de) * 2007-06-22 2008-12-24 Koenig & Bauer Aktiengesellschaft Verfahren zum Bestimmen einer Vorspannkraft zwischen zylindrischen Oberflächen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2629815B2 (ja) * 1988-05-07 1997-07-16 キヤノン株式会社 画像形成装置
EP0859288A1 (fr) * 1997-02-17 1998-08-19 Océ-Technologies B.V. Procédé de correction automatique de l'enregistrement d'images et système de transfert d'images utilisant ce procédé
DE19934658A1 (de) * 1999-07-23 2001-01-25 Nexpress Solutions Llc Druckvorrichtung
DE102005020213A1 (de) * 2005-04-28 2006-11-09 Robert Bürkle GmbH Vorrichtung zum Bedrucken von flächigen Werkstücken
EP1916102B2 (fr) * 2006-10-23 2014-06-25 Bobst Bielefeld GmbH Procédé pour ajuster un cylindre dans une machine à imprimer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19927555A1 (de) * 1999-06-16 2000-12-21 Koenig & Bauer Ag Einrichtung zum Einstellen von Schmitzringen
WO2002074540A1 (fr) * 2001-03-20 2002-09-26 Koenig & Bauer Aktiengesellschaft Procedes et dispositifs pour entrainer une unite d'impression
EP1464488A2 (fr) * 2003-03-03 2004-10-06 Koenig & Bauer Aktiengesellschaft Entraínements d'une unité d'impression
WO2004110761A1 (fr) * 2003-06-17 2004-12-23 Koenig & Bauer Aktiengesellschaft Unites d'impression d'une presse rotative comprenant des bagues de cylindre
DE102006001447A1 (de) * 2006-01-10 2007-07-12 Man Roland Druckmaschinen Ag Satellitendruckeinheit einer Rollenrotationsdruckmaschine
DE102007028699A1 (de) * 2007-06-22 2008-12-24 Koenig & Bauer Aktiengesellschaft Verfahren zum Bestimmen einer Vorspannkraft zwischen zylindrischen Oberflächen

Also Published As

Publication number Publication date
DE102008045402A1 (de) 2010-03-04
EP2159050A3 (fr) 2011-12-21

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