EP0665104B2 - Procédé et installation pour l'impression feuille à feuille - Google Patents
Procédé et installation pour l'impression feuille à feuille Download PDFInfo
- 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
- Authority
- 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
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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)
Description
- la figure 1 est une représentation schématique à l'arrêt du cylindre tramé et du cylindre porte-cliché,
- la figure 2 est une représentation schématique en fonctionnement normal, à vitesse linéaire périphérique identique du cylindre tramé et du cylindre porte-cliché de la figure 1,
- la figure 3 est une représentation schématique , dans les conditions de vitesse de l'invention, du cylindre tramé et du cylindre porte-cliché de la figure 2,
- la figure 4 est une représentation schématique d'une installation complète à réglage automatique pour l'impression flexographique feuille à feuille,
- et la figure 5 est une courbe montrant le rapport des vitesses de rotation en fonction de l'écrasement de l'élément en caoutchouc, à deux cadences données.
- un cylindre porte-cliché 2 de rayon Rc à la périphérie duquel est monté un cliché 3, d'épaisseur Ec,
- un système d'encrage 4 comportant un cylindre tramé 5,
- un cylindre de contre-pression 6,
- un système de transfert 7, du type courroie crantée.
Claims (6)
- Procédé d'impression feuille à feuille selon lequel une feuille est imprimée lors de son passage dans la zone de pincement entre un premier cylindre d'impression (2) qui comporte à sa périphérie un élément en caoutchouc (3) et un cylindre de contre-pression (6) , l'encre étant apportée au premier cylindre d'impression (2) par un deuxième cylindre apporteur d'encre (5), caractérisé en ce que les cylindres étant prévus pour être entraínés en rotation indépendamment les uns des autres, il consiste, pour diminuer la déformation des points d'impression, à régler les vitesses de rotation des différents cylindres en sorte d'ajuster les rapports des vitesses linéaires périphériques du deuxième cylindre apporteur d'encre (5) et du cylindre de contre-pression (6) à la vitesse linéaire périphérique de l'élément en caoutchouc (3) du premier cylindre d'impression (2) à des valeurs constamment supérieures à 1, comprises dans la fourchette 1,004 à 1,05.
- Procédé selon la revendication 1 caractérisé en ce que l'ajustement des rapports de vitesse est réglé automatiquement, pour un élément de caoutchouc donné, en fonction de l'écrasement de celui-ci.
- Procédé selon la revendication 1 caractérisé en ce que l'ajustement des rapports de vitesse est réglé automatiquement, en sorte d'obtenir la consommation électrique minimale pour le moteur d'entraínement du premier cylindre d'impression (2).
- Installation pour la mise en oeuvre du procédé d'impression feuille à feuille de la revendication 1, comportant un premier cylindre d'impression (2) ayant à sa périphérie un élément de caoutchouc (3), un deuxième cylindre apporteur d'encre (5) et un troisième cylindre de contre-pression (6), chaque feuille (12) à imprimer étant alimentée successivement jusqu'à la zone de pincement (9) entre le premier cylindre d'impression (2) et le cylindre de contre-pression (6), ainsi que des moyens d'entraínement en rotation des trois cylindres précités, caractérisée en ce que, les moyens d'entraínement consistent en trois moteurs ou moto-réducteurs indépendants mécaniquement, et en ce qu'elle comporte des moyens de réglage des vitesses de rotation des trois cylindres déterminés en sorte que les rapports des vitesses linéaires périphériques du deuxième cylindre apporteur (5) et du cylindre de contre-pression (6) à la vitesse linéaire périphérique de l'élément de caoutchouc (3) du premier cylindre d'impression (2) aient constamment des valeurs supérieures à 1, comprises dans la fourchette 1,004 à 1,05.
- Installation selon la revendication 4 caractérisé en ce qu'elle comporte des moyens de réglage de la pression des deuxième et troisième cylindres contre l'élément de caoutchouc du premier cylindre d'impression et en ce que lesdits moyens de réglage de pression sont connectés aux moyens de réglage des vitesses de rotation des cylindres en sorte de permettre l'ajustement des rapports de vitesse, pour un élément en caoutchouc donné, en fonction des valeurs de pression des cylindres l'un contre l'autre ou par l'intermédiaire de la feuille à imprimer.
- Installation selon la revendication 4 caractérisée en ce qu'au moins le moteur d'entraínement du premier cylindre d'impression (2) est muni de moyens de mesure de l'intensité instantanée ou du couple moteur dudit moteur, qui sont eux-même connectés via un circuit électronique approprié aux moyens de réglage de la vitesse de rotation des deuxième et troisième cylindres et en ce que ledit circuit électronique est programmé en sorte de régler comme vitesses de rotation des deuxième et troisième cylindres celles qui correspondent aux variations minimales de l'intensité ou du couple moteur, lors du passage de l'élément de caoutchouc (3) entre le premier et deuxième cylindre d'une part et entre le premier et troisième cylindre d'autre part.
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 (fr) | 1995-08-02 |
EP0665104B1 EP0665104B1 (fr) | 1996-08-21 |
EP0665104B2 true EP0665104B2 (fr) | 2000-05-03 |
Family
ID=9458817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94490057A Expired - Lifetime EP0665104B2 (fr) | 1994-01-03 | 1994-12-19 | Procédé et installation pour l'impression feuille à feuille |
Country Status (6)
Country | Link |
---|---|
US (1) | US5542353A (fr) |
EP (1) | EP0665104B2 (fr) |
CN (1) | CN1062811C (fr) |
DE (1) | DE69400403T3 (fr) |
ES (1) | ES2093504T5 (fr) |
FR (1) | FR2714632B1 (fr) |
Families Citing this family (11)
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 |
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 |
CN108189535B (zh) * | 2016-06-28 | 2019-07-12 | 佛山市顺德区美安达彩印包装有限公司 | 一种纸板压印设备 |
JP6982062B2 (ja) | 2016-08-23 | 2021-12-17 | ベーウントエル・インダストリアル・オートメイション・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 機械の駆動部を制御する方法 |
Citations (1)
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)
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 (fr) * | 1962-12-19 | |||
JPS55161652A (en) * | 1979-06-05 | 1980-12-16 | Mitsubishi Heavy Ind Ltd | Flexographic press |
EP0040192A1 (fr) * | 1979-11-05 | 1981-11-25 | Dahlgren Manufacturing Company | Bac a encre portatif |
US4445433A (en) * | 1982-04-02 | 1984-05-01 | Menashe Navi | Method and apparatus for variable density inking |
-
1994
- 1994-01-03 FR FR9400093A patent/FR2714632B1/fr not_active Expired - Lifetime
- 1994-12-15 US US08/356,876 patent/US5542353A/en not_active Expired - Lifetime
- 1994-12-19 EP EP94490057A patent/EP0665104B2/fr not_active Expired - Lifetime
- 1994-12-19 ES ES94490057T patent/ES2093504T5/es not_active Expired - Lifetime
- 1994-12-19 DE DE69400403T patent/DE69400403T3/de not_active Expired - Lifetime
- 1994-12-30 CN CN94113541A patent/CN1062811C/zh not_active Expired - Fee Related
Patent Citations (1)
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)
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 |
---|---|
EP0665104A1 (fr) | 1995-08-02 |
DE69400403D1 (de) | 1996-09-26 |
CN1062811C (zh) | 2001-03-07 |
DE69400403T3 (de) | 2001-03-15 |
ES2093504T5 (es) | 2000-10-16 |
US5542353A (en) | 1996-08-06 |
EP0665104B1 (fr) | 1996-08-21 |
FR2714632A1 (fr) | 1995-07-07 |
DE69400403T2 (de) | 1997-02-13 |
FR2714632B1 (fr) | 1996-03-15 |
CN1125174A (zh) | 1996-06-26 |
ES2093504T3 (es) | 1996-12-16 |
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