EP2460658B1 - Procédé de réglage de position de corps imprimantes dans machines d'impression flexographiques - Google Patents

Procédé de réglage de position de corps imprimantes dans machines d'impression flexographiques Download PDF

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Publication number
EP2460658B1
EP2460658B1 EP11186300.7A EP11186300A EP2460658B1 EP 2460658 B1 EP2460658 B1 EP 2460658B1 EP 11186300 A EP11186300 A EP 11186300A EP 2460658 B1 EP2460658 B1 EP 2460658B1
Authority
EP
European Patent Office
Prior art keywords
roller
printing
electric motor
current
rollers
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.)
Active
Application number
EP11186300.7A
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German (de)
English (en)
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EP2460658A1 (fr
Inventor
Claudio Caprioli
Massimo Bastici
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.)
KBA Flexotecnica SpA
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KBA Flexotecnica SpA
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Priority to PL11186300T priority Critical patent/PL2460658T3/pl
Publication of EP2460658A1 publication Critical patent/EP2460658A1/fr
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Publication of EP2460658B1 publication Critical patent/EP2460658B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/34—Cylinder lifting or adjusting devices
    • B41F13/38—Cylinder lifting or adjusting devices electrically or magnetically operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/30—Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
    • B41F31/32—Lifting or adjusting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/08—Tripping devices or stop-motions for starting or stopping operation of cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/10—Tripping devices or stop-motions for starting or stopping operation of damping or inking units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/14—Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors

Definitions

  • the present invention generally relates to machines for flexographic printing, comprising a central printing drum which supports the sheet which is to be printed on, with which one or more printing groups are placed in contact.
  • the printing groups comprise a printing roller which bears a printing plate and an inking roller of the plate, known as an anilox roller.
  • a first pair of electric motors moves the printing roller of each printing group towards/away from the central drum, and a second pair of electric motors moves the anilox roller of each printing group towards/away from the respective printing roller.
  • Each printing roller and each anilox roller exhibits ends that are slidable on a guide, and a motor is associated to each end which causes linear translations thereof.
  • Each motor is generally associated to a transducer device of the angular position of the drive shaft to which a linear position of the printing roller and/or of the inking roller or anilox rollers corresponds.
  • a recognised problem in these known-type flexographic printing machines is in determining the printing position of the printing rollers in relation to the drum, with the aim of guaranteeing sufficient printing pressure, though not excessive, as excess of printing pressure would damage the printing plates used, with repercussions on the printing quality.
  • a known setting method of the printing and respective anilox rollers consists in moving a printing roller towards the central drum and visually determining that a contact position has been reached between the printing roller (from which surface the printing plates project) and the central drum.
  • This method therefore comprises a visual and experimental evaluation of the correct contact position between the printing roller and the drum.
  • the same activities are carried out in determining the contact between the printing roller and the respective inking roller.
  • the aim of the present invention is to establish a setting method for positioning between a first and a second roller of a machine, for example for determining the reciprocal position between a printing roller and the drum and between the inking roller and the relative printing roller, which is free of the drawbacks existing in the prior art.
  • the aim of the present method is to determine automatically and repeatably the contact position between the printing roller and/or the printing plate supported thereby with the central drum, as well as the contact position between the inking roller with the printing roller and/or the printing plate supported thereby, independently of a visual analysis.
  • the present method calculates the effective distance between the detected contact positions and the desired non-contact positions defined for the printing roller and the inking roller, respectively.
  • the calculated distances will enable, in the use conditions of the machine, the correct automatic positioning of the printing rollers and the respective inking rollers in the respective contact positions with the central drum and the printing roller destined for carrying out the printing.
  • the invention provides a method for setting a reciprocal positioning of the two rollers, the central drum and the printing roller, or the printing roller and the inking roller.
  • One of the rollers is activated in translation by at least an electric motor along a reciprocal nearing-distancing direction, between a reciprocal non-contact position and a reciprocal contact position.
  • the contact position to which corresponds the correct pressure between the printing roller and the central drum is the position which obtains when the printing roller halts against the drum when the motor commanding the translation of the printing roller is activated with the value of the minimum current sufficient to cause the translation of the printing roller, which will be called the reference value.
  • a transducer device of the angular position of the rotor of the electric motor is comprised, which indicates the linear trajectory of the roller associated to the motor.
  • the method of the invention also comprises the activity of commanding electric current supply to the electric motor using the reference value, in order to bring about translation of the roller moved by the motor along the nearing direction to the roller associated thereto.
  • a determined velocity of the electric motor corresponds to the reference value of the current, and it is thus possible to detect, by means of an encoder, a lag between the velocity and the instant advancement velocity, which obviously sharply declines at the moment of contact between the rollers.
  • This difference, or lag, determines the correct contact position between the rollers.
  • the optimal pressure between the rollers is thus determined by the angular difference between the theoretical position of the rotor and the stator of the electric motor, and the reciprocal position thereof following reciprocal contact between the first roller and the second roller.
  • the first roller can be taken to be the central drum and in this case the second roller is the printing roller; alternatively the first roller can be taken to be the printing roller and therefore the second roller is the relative inking roller.
  • the detection of the optimal printing pressure is a function of the contact position between the printing roller and the drum (and between the inking roller and respectively the printing roller), without its being necessary, for determining the optimal pressure, to take careful and expensive measurements of the distance between the rollers.
  • the method of the invention comprises steps of determining a zero position, in which the second roller is in a non-contact position with the first roller, and a step of memorising the distance moved by the second roller between the zero position and the position in which the difference (lag) has been detected.
  • the invention includes the following steps:
  • This current enables advancing the roller at a known velocity, small, controlled and constant, and therefore enables a precise determination to be made of the contact position between the rollers, guaranteeing at the same time safeguarding of the printing plate mounted on the printing roller.
  • the invention further comprises the step of manually setting a maximum travel of the roller associated to the motor along the nearing/distancing direction of the other roller, at the end of which an error is signalled and the electric motor is commanded to return the respective roller into the zero position.
  • the optimal printing pressure between the rollers is determined, as described above, independently for each of the electric motors.
  • This solution enables a determination to be made, for each motor involved in the movement of a roller, of the exact run which enables obtaining the optimal pressure exerted by the roller.
  • 1 denotes in its entirety a machine for flexographic printing.
  • the machine 1 comprises a frame 10, on which a motorised central drum 11 is mounted, which central drum 11 bears a sheet 12 to be printed, which sheet 12 can be at least partially wound on the central drum 11.
  • the machine 1 comprises at least a printing group 20, which is formed by a gantryassociated to the frame 10 and rotatably supporting at least a printing roller 22 and a respective inking roller 23.
  • the printing roller 22 also known as a bearing plate, is destined to support one or more printing plates, not illustrated in the figures as of known type.
  • the printing plates can be of different shape and thickness and vary according to the graphic element to be printed.
  • the printing roller 22 and the inking roller 23 are activated in rotation by respective motors 24 and 25.
  • the rotation axes of the printing roller 22, the inking roller 23 and the central drum 11 are substantially parallel.
  • the printing roller 22 is activated in translation along special guides which are part of the gantry, in a direction D of nearing/distancing to or from the central drum 11 by two electric motors 30, independent of one another and supported by the scaffold and arranged laterally with respect to the printing roller 22.
  • Each of the electric motors 30 is destined to set in translation, along direction D, the respective distal ends 22a, 22b of the printing roller 22.
  • the printing roller 22 is mobile between a zero position, in which it is not in contact with the central drum 11, and a printing position, in which it is in contact with the central drum.
  • An endless screw 31 is associated to each electric motor 30, which screw 31 is arranged with a screw axis parallel to the direction D.
  • the distal ends 22a and 22b of the printing roller 22 are rotatably supported by two respective threaded bushings 32 that enmesh the endless screws 31 in order to activate the printing roller 22 in translation along direction D.
  • An encoder 33 is keyed on each motor 30, which encoder 33 is destined to determine both the angular position of the endless screw 31 of the rotor of the motor 30 and also the linear position of the bushing 32 when the motor 30 is supplied by the reference value of the current, and the eventual angular difference between the theoretical position of the rotor and the consequent contacting position between the rollers.
  • the encoder 33 can calculate the linear distance run by the respective bushing 32 along the direction D up to the moment of contact.
  • the inking roller 23 is activated in translation along direction D by two further electric motors 40, independent of one another, supported to the scaffold 21 and arranged laterally with respect to the inking roller 23.
  • Each of the electric motors 40 is destined to set the respective distal ends 23a, 23b of the inking roller 23 in translation along direction D, in a nearing and distancing direction to and from the printing roller 22.
  • the inking roller 23 is in turn mobile between a zero position, in which it is not in contact with the printing roller 22, and an inking position, in which it is in contact with the printing roller 22.
  • a respective endless screw 41 is associated to the rotor of each electric motor 40, which endless screw 41 is arranged with the screw axis thereof parallel to direction D.
  • the distal ends 23a and 23b of the inking roller 23 are rotatably supported by two respective further bushings 42 that are threaded and enmesh the endless screws 41 for translating activation of the inking roller 23 along the direction D.
  • An encoder 43 is keyed on each motor 40, destined to determine both the angular position of the endless screw 41 and the rotor of the motor 40, and thus also the linear position of the bushing 42 when the motor 40 is supplied by the reference value of the current, and the eventual angular lag between the theoretical position of the rotor and the position consequent to contact between the rollers.
  • the machine 1 comprises a plurality of printing groups 20 as described above and independent of one another, for example one for each printing colour.
  • the electric motors 30 and 40 are step-motors.
  • the method for setting the positioning of the rollers associated to the electric motors 30 and 40 comprises following steps:
  • the method is operable for each electric motor 30 which activates the printing roller 22 in translation and for each printing roller 22 of the machine 1 and, likewise, for each motor 40.
  • the reference current intensity differs for each motor and is defined by the different mechanical inertias acting on the ends of the rollers, due, for example, to the weight of the motors 24 and 25 which bears on one alone of the roller ends.
  • the memorised distance is the distance defining the contact position at the optimal printing pressure between the rollers.
  • the advancement velocity of each roller is determined by the value of the reference current supplied to the motors 30 and 40.
  • the advancement velocity of the flexographic machine is preferably comprised between 1 and 6 metres per minute, advantageously between 1 and 2 metres per minute.
  • the maximum run of each roller is preferably 0.4 mm (settable value) beyond the pre-detected distance during the preliminary verification step.
  • This maximum run enables, in the present example, the printing plate to be safeguarded in a case of encoder 33 malfunctioning.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)

Claims (5)

  1. Méthode pour déterminer la pression de contact optimum entre le rouleau d'impression (22) et le tambour central (11) et entre le rouleau encreur (23) et le rouleau d'impression (22) dans des machines pour impression flexographique, où le rouleau d'impression (22) et le rouleau encreur (23) sont activés par translation pour se déplacer par au moins un moteur électrique (30, 40) le long d'une direction se rapprochant/s'éloignant (D) d'une position sans contact et d'une position de contact respectivement avec le tambour central et le rouleau d'impression y étant associé, où la méthode inclut de :
    commander l'alimentation d'un courant électrique au moteur électrique (30, 40), selon une valeur de référence, correspondant à une valeur du courant dont la valeur est juste suffisante à entraîner le déplacement du rouleau (22, 23) le long d'une direction (D), à laquelle correspond une vitesse angulaire du moteur électrique (30, 40) ;
    caractérisée en ce que la méthode inclut de :
    détecter, avec un codeur (33, 43), un écart entre ladite vitesse angulaire du moteur électrique (30, 40) et la vitesse angulaire réelle qui diminue fortement au moment du premier contact entre les rouleaux ;
    interrompre immédiatement le fonctionnement du moteur électrique (30, 40), selon ledit écart ; et
    mesurer, grâce au codeur (33, 43), une distance linéaire exacte parcourue par le rouleau (22, 23) depuis la position sans contact, jusqu'à la position dans laquelle le moteur électrique (30, 40) s'arrête, de sorte à déterminer la pression optimum entre les rouleaux selon l'écart détecté.
  2. Méthode selon la revendication 1, caractérisée en ce qu'elle inclut des étapes consistant à déterminer une position zéro, dans laquelle le rouleau d'impression et le rouleau encreur (22 ou 23) activés par le moteur électrique (30, 40) sont dans une position sans contact respectivement avec le tambour central (11) et le rouleau d'impression (22) y étant associé, et mémoriser la distance parcourue par le rouleau (22, 23) activé par le moteur électrique (30, 40) entre la position zéro et la position dans laquelle l'écart a été détecté.
  3. Méthode selon la revendication 1, caractérisée en ce que la valeur du courant de référence est déterminée comme suit :
    une valeur d'essai du courant d'alimentation du moteur électrique (30, 40) est déterminée, valeur qui est insuffisante pour mettre le rotor du moteur électrique (30, 40) en rotation ;
    l'acheminement du courant électrique vers le moteur électrique (30, 40) est commandé selon la valeur d'essai ;
    la valeur d'essai augmente jusqu'à ce que le rotor du moteur électrique (30, 40) commence à tourner ;
    le courant de référence est pris pour être le courant correspondant au début du mouvement du moteur électrique (30, 40).
  4. Méthode selon la revendication 1, caractérisée en ce qu'elle inclut une étape consistant à déterminer un déplacement maximum pour chaque rouleau (22, 23) activé par le moteur électrique (30, 40) le long de ladite direction s'approchant/s'éloignant (D), une erreur étant signalée lorsque le déplacement maximum est atteint.
  5. Méthode selon l'une quelconque des revendications 1 à 4, dans laquelle la machine d'impression comprend deux moteurs électriques (30, 40) pour chaque rouleau (22, 23) devant être activé, caractérisée en ce que la pression optimale entre les rouleaux est déterminée selon l'écart détecté pour chacun des moteurs électriques (30, 40) de manière indépendante.
EP11186300.7A 2010-12-06 2011-10-24 Procédé de réglage de position de corps imprimantes dans machines d'impression flexographiques Active EP2460658B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11186300T PL2460658T3 (pl) 2010-12-06 2011-10-24 Sposób ustalania położenia elementów drukujących w maszynach do druku fleksograficznego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRE2010A000093A IT1402966B1 (it) 2010-12-06 2010-12-06 Metodo per il settaggio del posizionamento di corpi di stampa in macchine per la stampa flessografica

Publications (2)

Publication Number Publication Date
EP2460658A1 EP2460658A1 (fr) 2012-06-06
EP2460658B1 true EP2460658B1 (fr) 2019-01-16

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EP11186300.7A Active EP2460658B1 (fr) 2010-12-06 2011-10-24 Procédé de réglage de position de corps imprimantes dans machines d'impression flexographiques

Country Status (4)

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EP (1) EP2460658B1 (fr)
ES (1) ES2716989T3 (fr)
IT (1) IT1402966B1 (fr)
PL (1) PL2460658T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020187665A1 (fr) 2019-03-19 2020-09-24 Koenig & Bauer Ag Procédé de définition d'une position d'un contact mutuel entre un cylindre d'impression et au moins un contre-cylindre d'une machine à imprimer par flexographie
DE102019107012A1 (de) * 2019-03-19 2020-09-24 Koenig & Bauer Ag Verfahren zur Bestimmung der Lage gegenseitigen Kontaktes zwischen einer Druckwalze und mindestens einer unter einer mittleren Trommel und einer Farbwalze in Flexo-Druckmaschinen ausgewählten Gegenwalze, und die entsprechende Flexo-Druckmaschine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVR20130064A1 (it) * 2013-03-12 2014-09-13 Expert S R L Metodo di posizionamento dei cilindri di un gruppo di stampa in una macchina da stampa flessografica o rotativa
IT201900003965A1 (it) 2019-03-19 2020-09-19 Koenig & Bauer Flexotecnica S P A Metodo per la determinazione della posizione di mutuo contatto tra un rullo di stampa e almeno un contro-rullo scelto tra un tamburo centrale e un rullo inchiostratore in macchine di stampa flessografica e la relativa macchina di stampa flessografica
CN109927397B (zh) * 2019-05-04 2021-12-10 山东叶华纸制品包装有限公司 一种印刷机用压辊压力自检可调型机架及使用方法

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DE19900258A1 (de) * 1999-01-07 2000-07-13 Fischer & Krecke Gmbh & Co Verfahren zum Anstellen zweier Zylinder einer Druckmaschine gegeneinander
ES2300209B1 (es) * 2006-11-22 2009-05-01 Comexi, S.A. Metodo de ajuste posicional de cuerpos impresores en maquinas impresoras flexograficas.
ES2303471B1 (es) * 2007-01-26 2009-04-16 Comexi, S.A. Maquina impresora flexografica con unidades de impresion de estabilidad mejorada.

Non-Patent Citations (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020187665A1 (fr) 2019-03-19 2020-09-24 Koenig & Bauer Ag Procédé de définition d'une position d'un contact mutuel entre un cylindre d'impression et au moins un contre-cylindre d'une machine à imprimer par flexographie
DE102019107012A1 (de) * 2019-03-19 2020-09-24 Koenig & Bauer Ag Verfahren zur Bestimmung der Lage gegenseitigen Kontaktes zwischen einer Druckwalze und mindestens einer unter einer mittleren Trommel und einer Farbwalze in Flexo-Druckmaschinen ausgewählten Gegenwalze, und die entsprechende Flexo-Druckmaschine
US11298932B2 (en) 2019-03-19 2022-04-12 Koenig & Bauer Ag Method for determining the position of mutual contact between a printing roller and at least one counter roller

Also Published As

Publication number Publication date
IT1402966B1 (it) 2013-09-27
PL2460658T3 (pl) 2019-08-30
ES2716989T3 (es) 2019-06-18
ITRE20100093A1 (it) 2012-06-07
EP2460658A1 (fr) 2012-06-06

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