EP0665104B2 - Verfahren und Vorrichtung zum Nacheinander Bedrucken von Bogen - Google Patents

Verfahren und Vorrichtung zum Nacheinander Bedrucken von Bogen Download PDF

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Publication number
EP0665104B2
EP0665104B2 EP94490057A EP94490057A EP0665104B2 EP 0665104 B2 EP0665104 B2 EP 0665104B2 EP 94490057 A EP94490057 A EP 94490057A EP 94490057 A EP94490057 A EP 94490057A EP 0665104 B2 EP0665104 B2 EP 0665104B2
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EP
European Patent Office
Prior art keywords
cylinder
cylinders
printing
sheet
rubber element
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
EP94490057A
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English (en)
French (fr)
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EP0665104A1 (de
EP0665104B1 (de
Inventor
Jean-Pierre Cuir
Gérard Cuir
Raymond Barsamian
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Cuir SA
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Cuir SA
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Application filed by Cuir SA filed Critical Cuir SA
Publication of EP0665104A1 publication Critical patent/EP0665104A1/de
Publication of EP0665104B1 publication Critical patent/EP0665104B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/004—Driving means for ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/70—Driving devices associated with particular installations or situations
    • B41P2213/73—Driving devices for multicolour presses
    • B41P2213/734—Driving devices for multicolour presses each printing unit being driven by its own electric motor, i.e. electric shaft

Definitions

  • the present invention relates to an improved process for sheet printing with flexographic or possibly offset sheet of semi-rigid materials such as corrugated cardboard or paper in which the ink is brought to the sheet using a rubber element mounted at the periphery of a printing cylinder. It relates more particularly to a process improved to eliminate distortions in printing dots due to uncontrolled crushing of the rubber element. It also concerns a sheet-by-sheet printing installation specially designed for setting up work of the aforementioned process.
  • Flexographic type installations include a screened cylinder, a plate cylinder, a back pressure system and a transfer system which feeds the sheets one by one between the plate cylinder and the against pressure.
  • the plate which is mounted on the plate cylinder, is a rubber element which is capable of receiving the ink which is transferred to it by the screened cylinder and to apply it on the sheet to be printed during the passage of the latter in the nip between the plate cylinder and the back pressure system.
  • Offset type installations include a plate cylinder, a printing cylinder called blanket and a back pressure cylinder.
  • the blanket cylinder is coated on its periphery with a rubber element which is suitable for receiving the ink transferred to it by the plate cylinder for apply it to the sheet to be printed when it passes through the nip area between the blanket and the back pressure cylinder.
  • the aim that the applicants have set themselves is to propose a process sheet-to-sheet printing which compensates for this abnormal point deformation while allowing to work with a crushing of the element in rubber.
  • the cylinders being rotational drive independent of each other, the gear ratios are adjusted automatically, for a given rubber element, depending on overwriting it.
  • the gear ratio adjustment is adjusted automatically so as to obtain the minimum power consumption for the motor of the first printing cylinder.
  • This preferred mode of steering the gear ratios is based on a new finding made by the applicants.
  • This finding concerns the instantaneous power consumption of cylinder drive motors. In effect if we consider that to obtain a peripheral linear speed of rotation given the motors deliver a predetermined electric current, when there is no no contact between them, this intensity increases very appreciably when the rubber element is applied to the surface of the other cylinder.
  • applicants have found that there is a minimum threshold for this increase in intensity and that this threshold corresponded to the optimum setting gear ratios.
  • the installation includes means for adjusting the pressure of the second and third cylinders against the rubber element of the first printing cylinder and said adjustment means are themselves connected to the means for adjusting the rotational speeds of the cylinders so as to allow the adjustment of the gear ratios, for a rubber element given in function of the pressure values of the cylinders against each other.
  • At least the drive motor of the first cylinder printing device is provided with means for measuring the instantaneous intensity of said motor, said control means being themselves connected via a circuit electronic suitable for the means of adjusting the speed of rotation of the second and third cylinders.
  • the surface of the screened cylinder 5 comprises a multitude of cells him for receiving the ink which is brought to the rubber cylinder 8 to using a pump not shown.
  • the screened cylinder 5 allows during its rotation of an inking of plate 3, which represents the pattern to be printed.
  • the transfer system 7 allows the transport of each sheet in the direction of arrow D to the nip 9 between the back pressure cylinder 6 and the plate cylinder 2.
  • Plate cylinder 2, screen cylinder 5, transfer system 7 and the back pressure cylinder 6 are each driven by an individual motor with electronic servo, of the brushless motor type. All of these engines are connected to an electronic circuit 10 for adjusting their respective speed.
  • FIGS. 1 to 3 show the behavior of plate 3 during its passage in the contact zone 11 between the screened cylinder 5 and the cylinder plate holder 2.
  • the straightness of the two cylinders 2, 5, positioning of plate 3 on plate cylinder 2 it is necessary to reduce the distance between the outer surface of the screened cylinders and plate holder, in such a way that during the passage of the photograph 3 in the zone 11 there occurs a certain compression of said plate 3 making it possible to compensate for said irregularities and get a print across the sheet.
  • FIG. 1 shows the said deformation, when the two screened cylinders 5 and plate holder 2 were stopped.
  • the dotted line illustrates which would be the theoretical location of plate 3 in the absence of the screened cylinder 5.
  • this defect is corrected by significantly increasing the peripheral linear speed of the cylinder screened 5 compared to that of photograph 3. This increase is appreciably between 0.4 and 5%.
  • the optimal value of this speed increase is a function of a number of parameters, such as the printing rate that is required by the speed of rotation of the plate holder, the mechanical characteristics of the photo 3 and the overwriting of the photo.
  • V1 is the peripheral linear speed of snapshot 3 and V2 that of the screened cylinder 5
  • the optimal V2 / V1 ratio can be determined by successive tests observing, for each test, the shape and surface of the point as the ratio increases beyond 1, said surface decreases then increases again. It is for this minimal surface, which should be close to the theoretical surface of the printing point, that is the optimal V2 / V1 ratio.
  • the electronic circuit 10 is programmed to automatically control the position of the brushless motors which rotate the plate cylinder 2, the screen cylinder 5 and the back pressure cylinder 6, respectively. This control is produced so that one obtain the speed ratio in accordance with the process of the invention.
  • This same electronic circuit 10 is connected to the system for adjusting the positioning of the different cylinders with respect to each other, which defines the pressure exerted between said cylinders during the passage of a part of the plate 3 between the screened cylinder 5 and the door cylinder -cliché 2, and on the other hand during the passage of the sheet to be printed 12 between the radiograph 3 and the back-pressure cylinder 6.
  • This pressure, for a given radiograph 3 is characteristic of the crushing of said radiograph, c that is to say the reduction in thickness E c in the contact zone 11 (FIG. 1).
  • FIG. 5 shows examples of speed ratio value V2 / V1 as a function of the overwriting in millimeters of plate 3 for two printing rates of 4,000 sheets per hour and 8,000 sheets per hour.
  • the servo-control carried out by the electronic circuit 10 of the rotational speeds is obtained by measuring one of the operating parameters motors for driving said cylinders. It can be the measurement of the electric current or the measurement of the motor torque.
  • the optimal ratio of speeds is that which corresponds to the minimum of the corresponding parameter.
  • the control of the installation can be done automatically after a preset on the first sheets to be printed. It is enough to measure for a speed ratio of 1 the variation of the intensity or the motor torque during passage of the plate between the screened cylinder 5 and the plate cylinder 2 or still during the passage of the sheet 12 between the plate 3 and the counter cylinder - pressure 6.
  • the speed ratios are gradually increased while continuing to measure variations in motor current or torque. The comparison of successive measurements makes it possible to determine the gear ratios which correspond at minimum variations in current or motor torque.
  • Process and installation are not limited to printing flexographic type but can also be applied to offset printing.

Landscapes

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

Claims (6)

  1. Verfahren zum Nacheinanderbedrucken von Bogen, bei dem ein Bogen bei seinem Hindurchtritt in der Druckzone zwischen einem ersten Druckzylinder (2), der an seinem Umfang ein Gummielement (3) aufweist und einem Gegendruckzylinder (6) bedruckt wird, wobei die Druckfarbe bzw. Tinte zu dem ersten Druckzylinder (2) durch einen zweiten Druckfarbenzuführzylinder (5) gebracht wird, dadurch gekennzeichnet, daß die Zylinder vorgesehen sind, um unabhängig voneinander in Drehung versetzt zu werden, es, zur Verminderung der Verformungen der Druckpunkte, darin besteht, die Drehgeschwindigkeiten der verschiedenen Zylinder derart zu regeln, daß die Verhältnisse der linearen Umfangsgeschwindigkeiten des zweiten Druckfarbenzuführzylinders (5) und des Gegendruckzylinders (6) auf die lineare Umfangsgeschwindigkeit des Gummielements (3) des ersten Druckzylinders (2) auf Werte eingestellt werden, die konstant größer als 1 sind, enthalten in der Bandbreite von 1,004 bis 1,05.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Einstellung der Geschwindigkeitsverhältnisse für ein vorgegebenes Gummielement, in Abhängigkeit des Quetschens von diesem, automatisch eingestellt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Einstellung der Geschwindigkeitsverhältnisse automatische geregelt wird, derart, daß der minimale elektrische Verbrauch für den Antriebsmotor des ersten Zylinders (2) erreicht wird.
  4. Vorrichtung zum Durchführen des Verfahrens zum Nacheinanderbedrucken von Bogen, nach Anspruch 1, mit einem ersten Zylinder (2), der an seinem Umfang ein Gummielement (3) aufweist, einem zweiten Druckfarbenzugbringzylinder (5) und einem dritten Gegendruckzylinder (6), wobei jeder zu druckende Bogen (12) aufeinanderfolgend bis in die Eingriffs- oder Quetschzone (9) zugeführt wird, zwischen dem ersten Druckzylinder (2) und dem Gegendruckzylinder (6), sowie mit Drehantriebseinrichtungen der drei vorgenannten Zylinder, dadurch gekennzeichnet, daß die Antriebseinrichtungen aus drei Motoren oder Motorgetrieben bestehen, die mechanisch unabhängig sind, und daß sie Einrichtungen zum Einstellen der Drehgeschwindigkeiten der drei Zylinder aufweisen, die derart bestimmt sind, daß die linearen Umfangsgeschwindigkeitsverhältnisse des zweiten Zuführzylinders (5) und des Gegendruckzylinders (6) zur linearen Umfangsgeschwindigkeit des Gummielements (3) des ersten Druckzylinders (2) konstant Werte aufweisen, die größer als 1 sind, enthalten in der Bandbreite von 1,004 bis 1,05.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß sie Einstelleinrichtungen des Drucks des zweiten und dritten Zylinders gegen das Gummielement des ersten Druckzylinders aufweist, und daß die Einstelleinrichtungen des Druckes mit den Einstelleinrichtungen der Drehgeschwindigkeiten der Zylinder verbunden sind, derart daß sie die Einstellung der Geschwindigkeitsverhältnisse für ein vorgegebenes Gummielement in Abhängigkeit der Druckwerte der Zylinder gegeneinander oder mittels des zu bedruckenden Bogens ermöglichen.
  6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß wenigstens der Antriebsmotor des ersten Druckzylinders (2) mit Einrichtungen zum Messen der Augenblicksintensität oder des Motormoments des Motors versehen ist, die ihrerseits über einen geeigneten elektronischen Schaltkreis mit den Einstelleinrichtungen der Drehgeschwindigkeit des zweiten und dritten Zylinders verbunden sind, und daß der elektronische Schaltkreis derart programmiert ist, daß er als Drehgeschwindigkeiten des zweiten und dritten Zylinders jene einstellt, die den minimalen Veränderungen der Intensität oder des Motormoments beim Hindurchbewegen des Gummielements (3) zwischen dem ersten und zweiten Zylinder einerseits, und zwischen dem ersten und dritten Zylinder andererseits entsprechen.
EP94490057A 1994-01-03 1994-12-19 Verfahren und Vorrichtung zum Nacheinander Bedrucken von Bogen Expired - Lifetime EP0665104B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9400093A FR2714632B1 (fr) 1994-01-03 1994-01-03 Procédé et installation pour l'impression feuille à feuille.
FR9400093 1994-01-03

Publications (3)

Publication Number Publication Date
EP0665104A1 EP0665104A1 (de) 1995-08-02
EP0665104B1 EP0665104B1 (de) 1996-08-21
EP0665104B2 true EP0665104B2 (de) 2000-05-03

Family

ID=9458817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94490057A Expired - Lifetime EP0665104B2 (de) 1994-01-03 1994-12-19 Verfahren und Vorrichtung zum Nacheinander Bedrucken von Bogen

Country Status (6)

Country Link
US (1) US5542353A (de)
EP (1) EP0665104B2 (de)
CN (1) CN1062811C (de)
DE (1) DE69400403T3 (de)
ES (1) ES2093504T5 (de)
FR (1) FR2714632B1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6059705A (en) * 1997-10-17 2000-05-09 United Container Machinery, Inc. Method and apparatus for registering processing heads
US6549745B2 (en) 2001-02-16 2003-04-15 Nexpress Solutions Llc Method and apparatus for controlling overdrive in a frictionally driven system including a conformable member
US6556798B2 (en) 2001-02-16 2003-04-29 Donald S. Rimai Method and apparatus for using a conformable member in a frictional drive
US20030100343A1 (en) * 2001-05-18 2003-05-29 Zourntos Takis C. Communications system and method
DE102013109851A1 (de) 2013-09-09 2015-03-12 Windmöller & Hölscher Kg Verfahren für die Kontrolle der Rotationsgeschwindigkeit für eine Antriebsvorrichtung einer Druckwalze
DE102016015722B4 (de) 2016-05-11 2023-06-22 Koenig & Bauer Ag Verfahren zum Erfassen und Einstellen von Parametern eines Bearbeitungsaggregats
DE102016208109A1 (de) * 2016-05-11 2017-11-16 Koenig & Bauer Ag Verfahren zum Erfassen und Einstellen von Parametern eines Bearbeitungsaggregats
CN106079869B (zh) * 2016-06-28 2018-05-08 佛山达德制版有限公司 一种改进纸板压印机
CN106183383B (zh) * 2016-06-28 2018-12-18 程丽丽 一种纸板压印机
CN106113920B (zh) * 2016-06-28 2019-03-12 义乌博众文化用品有限公司 自动纸板压印机
WO2018036619A1 (de) 2016-08-23 2018-03-01 B&R Industrial Automation GmbH Verfahren zur regelung des antriebs einer maschine
DE102021118033A1 (de) * 2021-07-13 2023-01-19 Koenig & Bauer Ag Bearbeitungsmaschine sowie Verfahren zur Einstellung einer Drucklänge und/oder Bearbeitungslänge

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553032A1 (fr) † 1983-09-14 1985-04-12 Grace W R Ltd Presse d'impression flexographique a entrainement en prise directe et materiau d'emballage ainsi imprime

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US2022696A (en) * 1932-06-17 1935-12-03 Irving Trust Co Printing machine
US2619901A (en) * 1946-08-28 1952-12-02 Harris Seybold Co Impression length varying means for rotary offset printing machines
FR1341700A (fr) * 1962-09-21 1963-11-02 Etudes De Machines Speciales Procédé et dispositif d'encrage pour machines d'impression à l'encre grasse
GB1052880A (de) * 1962-12-19
JPS55161652A (en) * 1979-06-05 1980-12-16 Mitsubishi Heavy Ind Ltd Flexographic press
EP0040192A1 (de) * 1979-11-05 1981-11-25 Dahlgren Manufacturing Company Tragbarer farbbehälter
US4445433A (en) * 1982-04-02 1984-05-01 Menashe Navi Method and apparatus for variable density inking

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553032A1 (fr) † 1983-09-14 1985-04-12 Grace W R Ltd Presse d'impression flexographique a entrainement en prise directe et materiau d'emballage ainsi imprime

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Report of the proceedings fourteenth annual meeting and technical forum, Flexographic Technical Asssociation, Chicago, Ill., US, April 5-6, 1972, pp 1-22 and 43-151 †
UGRA Mitteilungen, 3/76 Dezember 1976, Seiten 59-88 †

Also Published As

Publication number Publication date
CN1125174A (zh) 1996-06-26
DE69400403D1 (de) 1996-09-26
ES2093504T3 (es) 1996-12-16
DE69400403T2 (de) 1997-02-13
EP0665104A1 (de) 1995-08-02
FR2714632A1 (fr) 1995-07-07
FR2714632B1 (fr) 1996-03-15
EP0665104B1 (de) 1996-08-21
ES2093504T5 (es) 2000-10-16
CN1062811C (zh) 2001-03-07
US5542353A (en) 1996-08-06
DE69400403T3 (de) 2001-03-15

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