EP1013418B1 - Dispositif d'encrage - Google Patents

Dispositif d'encrage Download PDF

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Publication number
EP1013418B1
EP1013418B1 EP99125079A EP99125079A EP1013418B1 EP 1013418 B1 EP1013418 B1 EP 1013418B1 EP 99125079 A EP99125079 A EP 99125079A EP 99125079 A EP99125079 A EP 99125079A EP 1013418 B1 EP1013418 B1 EP 1013418B1
Authority
EP
European Patent Office
Prior art keywords
ink
inking
printing
inking unit
unit according
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
EP99125079A
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German (de)
English (en)
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EP1013418A1 (fr
Inventor
Gotthard Schmid
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
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Heidelberger Druckmaschinen AG
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Publication of EP1013418A1 publication Critical patent/EP1013418A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/28—Spray apparatus

Definitions

  • the invention relates to an inking unit for a printing press, the at least one ink roller rolling on a plate cylinder of the printing press, an inkjet printing apparatus with a variety of selectively controllable paint nozzles and a paint transfer device with a circumferential surface for Transfer of ink from the ink jet printing apparatus to the minimum contains an ink roller.
  • Inking presses often use inking units with an ink fountain as a storage container for printing ink, an ink fountain pen, an ink lifter and one Arrangement of many on top of each other or on the plate cylinder Printing machine rolling ink rollers, to which ink transfer rollers, friction rollers and inking rollers.
  • the need for ink is in Dependency on the printed image set zone by zone that a resilient Knife (ink knife) more or less pressed against the ink duct and so the amount of color changed by the gap between the Ink knife and the ink duct.
  • the regulation of the printing ink over the entire width of the color ductor is done by changing the Ink take-off strip, which by the ink lifter in a rhythmic pendulum motion is removed from the ink duct.
  • Such inking units divided into ink zones over the printing width have a number of electronic or electromechanical control and actuating elements for the slotted or unslit color knife with which the Machine operators supply the ink according to the print subject across the print width can vary.
  • the number of color zones depends on the size of the used actuators, the reasonable effort and the width of the printing form. With increasing number of color zones and thus narrower color zones the number of display elements for the zone opening degree also increases as well as the working time and the number of waste sheets if during the Print a manual color correction by expanding or reducing the Ink zone opening takes place.
  • the color zone opening determines together with the Duktorhub the amount of paint, which is averaged over the Ink zone width is required at this point on the sheet. Within one Color zone cannot be differentiated.
  • a problem with such inking units is the so-called stenciling, one itself in the printing direction shadow-like repetitive image of a previous one Print image part.
  • This figure is shown by a higher or lower Coloring compared to the environment.
  • the strength of stenciling can be below other by rubbing rollers rubbing along the printing width and / or Ink application rollers can be reduced.
  • Yet remain machine-specific shortcomings caused by the breadth and The number of color zones is limited, such as weakening of the peripheral zones, excess and Undermining the ink supply, among others. With appropriate effort, this can Inadequacies due to machine-specific characteristics and computer programs be counteracted.
  • this creates a short inking unit with a both in Width direction of the ink roller, according to a zonal color control as in Zone inking units, as well as precisely applied ink application in their circumferential direction.
  • the disadvantage is that because of the lack of rubbing strong Stenciling occurs.
  • the only way to counteract this is that the color is transferred from one roller to another with as little residue as possible and that the resolution of the inkjet printing apparatus is as high as possible.
  • the resolution of the inkjet printing apparatus should be as high as that required print quality, i.e. it finds some kind of indirect inkjet printing instead of what the advantages of offset printing, namely inexpensive edition printing in high quality, no longer exist.
  • the invention has for its object a short as well as to create stencil-free inking unit for quality printing.
  • the at least one inking roller and the ink transfer device e.g. is an ink transfer roller, all the same outer circumference as the plate cylinder, i.e. they are all one-turn. That way it becomes too precisely metered and belonging to a certain image area of the subject Ink quantity always in the same place on the ink transfer device or all other rollers applied, from which they also passed on the sheet becomes.
  • This has the effect of stenciling, as it is known Short inking units occur due to insufficient friction, reliably avoided.
  • Another solution to the problem is to apply the paint to the make at least one ink roller so that viewed in the circumferential direction the most uniform possible color application is carried out.
  • the inking roller can have several ink nozzles when viewed in the circumferential direction be arranged one behind the other. This makes it possible to have many small color dots to apply to the ink roller, which corresponds to a film-like covering. Such a thing strong rubbing, such as when removing a strip of paint using a paint lifter is not necessary.
  • the high A resolution that can be produced with an ink jet apparatus Color zone which is usually 32 mm, can be defined much narrower. This also enables better dosing, although none in the circumferential direction color distribution adapted to the subject.
  • the quieter machine run is not only due to the savings as mentioned above given the lateral rubbing, but also by the uniform Application of printing ink in the circumferential direction.
  • the device according to the invention made possible by the application of printing ink in a uniform thickness over the Considered the size of the ink roller that the torque requirement remains constant.
  • the invention is particularly suitable for offset printing machines with the so-called Computer-to-press / direct imaging technology, such as the Heidelberg presses AG applies in the Quickmaster DI and in which the imaging unit is moved to the printing press.
  • the plates are directly in the Printing machine illustrated on the cylinder by the untreated printing form or pressure plate clamped on a plate cylinder and by one in the Imaging head installed is imaged to one for the printing press To produce offset printing usable printing form. That way already at the Printing machine available raster data can in printing operation without recreating the data in addition to controlling the inkjet printing apparatus can be used in every machine cycle.
  • An adaptation of the Resolution of the raster data to the normally lower resolution of a Inkjet printing apparatus is very easy to carry out. For example the resolution resolution was easily carried out in the printing press computer become.
  • the resolution of the ink jet printing apparatus is preferably smaller than the resolution the raster data is designed for the imaging unit
  • the corresponding Resolutions in printing processes other than offset printing are also the same be, e.g. in anilox, gravure or other printing processes for which the The invention is also suitable, especially if the printing form is produced in the machine becomes.
  • the screen raster data from the prepress stage can be used can also be used for the inkjet printing apparatus.
  • the invention is not only suitable for master-bound printing processes, at which the printing plate or the image carrier creates only once per print job but also for future digital printing presses with the so-called Computer-to-paper technology, for imaging each individual printing substrate either the same or new image data completely read out once become.
  • the inkjet printer must also Query data completely once per cylinder revolution.
  • the one at the The machine used in the printing press must have enough power to run this to provide high data rates in the required time. To the deployment To ensure the data are suitable in prepress Data storage systems used.
  • the inking unit according to the invention instead of the conventional Ink unit can be built in, as suitable digital data for the inkjet printing apparatus from platesetter (CTP) or film exposure (CTF) already exist and only have to be transferred to the printing press, if necessary after the mentioned adjustment of the resolution.
  • CTP platesetter
  • CTF film exposure
  • the color nozzles of the ink jet printing apparatus can e.g. simply in one single straight line across the print width close to the ink transfer device be arranged. However, a two-dimensional is preferred Arrangement or matrix of paint nozzles used. If the ink transfer device is an ink transfer roller, the matrix of ink nozzles must be curved, to nestle against the surface of the ink transfer roller.
  • an endless transfer device is used Use tape that rotates around two or more rollers. This has the Advantage that the color nozzle matrix can be flat because it is on a straight line Section of the ink ribbon can be arranged.
  • At least one the inking rollers and / or the ink transfer device with a drive for one slight reciprocation along its axis during printing is provided, i.e. oscillate or oscillate in a manner known per se.
  • the amplitude of this movement should not be significantly larger than that Resolution of the inkjet printing apparatus to be the subject-specific Do not destroy dosage again.
  • At least one of the inking rollers and / or the ink transfer device an optionally activatable ink squeegee intended. Because with the inkjet printing device an active ink supply takes place, and not, as with ink fountain systems, a color return in limited frame takes place, there may be over-coloring, overfilling of the inking unit come. With conventional ink fountain systems, this is under avoided or reduced by the fact that the residual color film thickness on the Heber prevents the same amount regardless of this layer thickness Color runs in.
  • the squeegee in the invention can at required times activated to create a neutral starting position in the inking unit.
  • a Control with adjustable parameters allows the printer to print the "Neutralization intervals" based on the print job Propose lists or your own experience.
  • the squeegee can across the print width into several that can also be activated independently of one another Single doctor blade can be divided, which allow local doctoring. Besides, can the ink squeegee in a known manner to scrape off the ink when changing colors or if the inking unit is dirty.
  • one or more sensors can be used be provided, which record the color residue and in a control loop for automatic control of the new spraying are included.
  • the inkjet printing apparatus can simply be replaced become.
  • a particularly quick color change is made possible that two or more inkjet printers swivel side by side be arranged, with the required printing apparatus in the position is pivoted in which the paint nozzles are directed onto the paint transfer device is.
  • the inking unit according to the invention comes with very few ink rollers the ink transfer device and the plate cylinder and can be very be made compact. In many cases, a single ink roller ranges between these two elements.
  • Conventional devices with which a machine operator supplies the ink can re-adjust zone by zone if necessary include a variety of Control and display elements that are correspondingly difficult to operate and to are watching.
  • the one particular ergonomic influencing of the ink supply by the operator is enabled a control device for zone-free color readjustment is provided, the one Contains screen to display the current print subject, with any to influencing fields on the displayed print subject by the operator can be selected, preferably to one of programs for image processing known way by dragging with the mouse or the like.
  • the inking unit according to the invention is suitable for both waterless offset printing as well as for wet offset printing.
  • low viscosity printing inks required if a printhead for conventional ones is used as the inkjet printing apparatus Inkjet printer is used.
  • Such a printhead works e.g. on the Way that a small volume of printing ink temporarily by a piezoelectric Actuator is compressed, with a droplet of ink on one Pixel is injected.
  • a Inking unit With a suitable design of the inkjet printing apparatus, however, a Inking unit according to the invention relatively high-viscosity standard offset printing inks or UV drying offset printing inks.
  • a high pressure pump device for supplying the ink jet printing apparatus with ink under a predetermined high pressure, a heater for heating the printing ink to a predetermined temperature above room temperature and a variety of valves for selective Control of the ink supply to the ink nozzles of the inkjet printing apparatus intended.
  • the printing ink which normally has a viscosity of approximately 50 to 70 Pa s has the valves under a pressure in the range of about 10 to 100 bar supplied and at a temperature in the range of about 40 to Is heated to 70 ° C, the viscosity decreases to such an extent that it is highly precise Color dosing is possible.
  • valves can e.g. pulse length controlled solenoid valves, as in the Zeitschrift Sciencestechnik, July / August 1996, p. 30, for an inking unit are where the printing ink using a digital ink pump system, the one Gear pump contains, applied to a specially trained ink film roller becomes.
  • Valves with piezoelectric actuators as adjusting elements are even more expedient, so-called piezo valves.
  • a valve e.g. in DE-A-4 220 177 is described has response times on the order of microseconds. It can be opened and closed many times faster are called conventional solenoid valves, the response times of several Have milliseconds. This enables very fine dosing of the printing ink, preferably by fully opening and closing controlled by pulse length the valve or alternatively by regulating the flow rate of a valve, the degree of opening is controlled by a fast control loop. Moreover can with fast piezo valves even at high printing speeds relatively high resolution of the ink jet printing apparatus can be realized would be limited by long valve response times.
  • the inking unit shown in Fig. 1 includes an ink jet printing apparatus 2 with a plurality of paint nozzles 4, which are shown schematically as arrows, which indicate the spray direction.
  • the color nozzles 4 are two-dimensional Arranged matrix that nestles against an ink transfer roller 6 with a small gap in between.
  • the ink transfer roller 6 rolls on an inking roller 8, which in turn opens rolls off a plate cylinder 10 of an offset printing machine, of which in FIG. 1 a rubber cylinder 12 and an impression cylinder 14 can also be seen. Alles these rollers and cylinders are single-turn, i.e. they are all the same diameter.
  • dampening unit 16 for wet offset is shown schematically in FIG. 1, this is not necessary in the case of waterless offset printing.
  • an ink doctor blade 18 Adjacent to the ink transfer roller 6, an ink doctor blade 18 is arranged against the ink transfer roller 6 and away from it.
  • the color nozzles 4 in accordance with raster data that the Inkjet printing apparatus 2 are supplied, selectively driven to the Ink transfer roller 6 according to the raster data with printing ink spray.
  • Each point on the ink transfer roller 6 is just as much Color supplied as required on the plate cylinder 10.
  • the platesetter are fed Raster data, which represent the printed image, into one of the matrix Color nozzles 4 corresponding raster image converted with the inkjet printing apparatus 2 is controlled.
  • the ink nozzles 4 guide the ink transfer roller 6 exactly the amount of color at each point as it was when printing from Plate cylinder 10 is delivered to the paper or other printing substrate.
  • the nips between the ink transfer roller 6 and the ink application roller 8 or between the inking roller 8 and the plate cylinder 10 ensure a smooth color film so that the resolution of the ink jet printing apparatus 2nd becomes invisible.
  • a raster image suitable for the ink jet printing apparatus 2 normally has a much lower resolution than the normal offset resolution because the distance of the Color nozzles 4 is comparatively large. This does not affect the print quality deteriorated, since it is ultimately determined by the plate cylinder 10, but improved, since reliably no stenciling occurs.
  • color nozzles 4 In the case of a rough subject, one or in areas with little variation Subjects several color nozzles 4 can be controlled together. With fine Representations, the color nozzles 4 are individually controlled, and for coarse or full-area representations, the color nozzles 4 are controlled together.
  • To control the total amount of ink applied to the ink transfer roller 6 can use sensors to record the remaining ink on the inking roller 8 can be provided, or it will be with a slight excess of color worked, from time to time with the squeegee 18 a neutral situation will be produced.
  • Figure 1a shows a known from conventional inking units Ink roller arrangement to an ink jet printing apparatus 2 with a plurality of color nozzles 4 is arranged.
  • Color nozzles 4 arranged in a two-dimensional matrix.
  • the Two-dimensional arrangement of the color nozzles 4 has the advantage that with many small blobs of paint an almost film-like application of paint on a Ink transfer roller 6 can be applied. This makes rubbing like it is necessary in conventional inking units because one of the Ink lifter applied to a paint roller in the circumferential direction must be equalized, not necessary.
  • Offset printing presses have an advantage in this because there Vibration excitation due to lateral rubbing is particularly negative affect the print quality.
  • the number of ink transfer rollers 6 can thereby be reduced to a minimum.
  • Fig. 2 shows a partial view of an inking unit, which in the not shown Share just as the inking unit of Fig. 1 is designed.
  • the inking unit of Fig. 2 differs from that of Fig. 1 in that instead of the ink transfer roller 6 an ink transfer ribbon 20 e.g. made of steel or rubber is that rotates around two rollers 22, 24.
  • the ink transfer ribbon 20 has the same circumference as the plate cylinder 10.
  • the ink jet printing apparatus 2 ' is arranged, the Color nozzles 4 'are arranged in one plane in this case, whereby the Ink jet printing apparatus 2 'is easier to manufacture.
  • Fig. 2 is a similar to the squeegee 18 of Fig. 1 squeegee 18 'not on the Ink transfer device, the belt 20, but on the inking roller 8th arranged.
  • the inking units shown in FIGS. 1 and 2 make it possible to supply the ink to influence selected areas without the risk of stenciling exists because the single-speed design of the rollers or the belt leads to that an exposure in one place in the form of more or less color directly at the same place in the settlement and nowhere else.
  • Phase shift takes place in such a way that this is due to the settlement on the provided place on the plate cylinder 10.
  • the ink job from the inkjet printing apparatus then advantageously takes place 2.2 'on an ink transfer roller 6 and then directly on the plate cylinder 10 instead.
  • a particularly useful way for zone-free color control 3 illustrates both in the width direction and in the circumferential direction shows a computer screen 26 on which a currently printed subject 28 is shown.
  • the computer screen 26 shows that for the Platesetter used raster image of subject 28.
  • the machine operator recognizes from a fresh print copy, that in a dashed area on the subject 28 an adjustment
  • the ink supply is required, it can be done with the mouse or another Show device a corresponding field 30 on the computer screen 26 raise. Dragging on a corner or on an edge of the dashed line drawn field 30 with the mouse increases or decreases the field as it is known from image processing programs.
  • the operator After the operator determines the exact size and position of field 30 he can do it through a suitable action such as a double click with the Select the mouse and a window for color adjustment opens (not ) in which the desired correction is specified according to strength and direction can be. In this or similar manner, the operator can quickly and easily simply correct the ink supply in any area of the subject 28.
  • a suitable action such as a double click with the Select the mouse and a window for color adjustment opens (not ) in which the desired correction is specified according to strength and direction can be.
  • the method of color correction illustrated in FIG. 3 is only an example and can be modified in many ways.

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

Claims (12)

  1. Dispositif d'encrage pour une imprimante, qui comprend au moins un rouleau encreur roulant sur un cylindre de plaque de l'imprimante, un appareil imprimeur à jet d'encre avec une pluralité de buses à encre actionnables sélectivement et un dispositif de transfert d'encre avec une surface d'enveloppe rotative pour le transfert de l'encre d'impression de l'appareil imprimeur à jet d'encre sur le au moins un rouleau encreur, caractérisé en ce que le au moins un rouleau encreur (8) et le dispositif de transfert d'encre (6; 20) ont la même circonférence extérieure que le cylindre de plaque (10).
  2. Dispositif d'encrage selon la revendication 1, caractérisé en ce que l'imprimante est une imprimante offset et en ce que l'espacement des trames des buses à encre (4; 4') est inférieur à la résolution d'image de l'imprimante offset.
  3. Dispositif d'encrage selon la revendication 1 ou 2, caractérisé en ce que l'imprimante comprend une unité d'illustration à plaque et en ce que les données des trames utilisées pour l'unité d'illuntration à plaque avant l'impression sont utilisées pendant l'impression pour commander l'appareil imprimeur à jet d'encre (2; 2') à chaque cycle de machine.
  4. Dispositif d'encrage selon la revendication 2 et la revendication 3, caractérisé en ce que les données des trames utilisées pour l'unité d'illustration sont envoyées à un dispositif pour la réduction de la résolution d'image qui génère des données de trames appropriées avec une résolution d'image réduite et qui commande ainsi l'appareil imprimeur à jet d'encre (2; 2').
  5. Dispositif d'encrage selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le dispositif de transfert d'encre est un rouleau de transfert d'encre (6).
  6. Dispositif d'encrage selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le dispositif de transfert d'encre est une bande de transfert d'encre (20) et en ce que les buses à encre (4') de l'appareil imprimeur à jet d'encre (2') sont réparties dans un plan parallèle à un segment rectiligne de la bande de transfert d'encre.
  7. Dispositif d'encrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un des rouleaux encreurs (8) et/ou le dispositif de transfert d'encre (6; 20) est muni d'un mécanisme d'entraínement pour un mouvement de va-et-vient le long de son axe pendant l'impression.
  8. Dispositif d'encrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une raclette d'encre (18; 18') actionnable à volonté est prévue sur au moins un des rouleaux encreurs (8) et/ou aur le dispositif de transfert d'encre (6; 20).
  9. Dispositif d'encrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un rouleau encreur (8) se trouve exactement entre le dispositif de transfert d'encre (6; 20) et le cylindre de plaque (10) .
  10. Dispositif d'encrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dispositif de commande est prévu pour l'intervention d'un opérateur sur l'alimentation en encre, lequel dispositif comprend un écran (26) pour l'affichage du sujet actuel d'impression (28), les champs d'intervention (30) pouvant être sélectionnés par l'opérateur sur le sujet d'impression affiché.
  11. Dispositif d'encrage selon l'une quelconque des revendications précédentes, caractérisé en ce que l'appareil imprimeur à jet d'encre (2; 2') comprend un dispositif de pompe haute pression pour l'alimentation en encre sous une haute pression prédéterminée, un dispositif de chauffage pour réchauffer l'encre à une température prédéterminée au-dessus de la température ambiante et une pluralité de soupapes pour la commande sélective de l'alimentation en encre des buses d'encre (4; 4') de l'appareil imprimeur à jet d'encre.
  12. Dispositif d'encrage selon la revendication 11, caractérisé en ce que les soupapes sont des soupapes à commande piézoélectrique.
EP99125079A 1998-12-22 1999-12-16 Dispositif d'encrage Expired - Lifetime EP1013418B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19859437A DE19859437A1 (de) 1998-12-22 1998-12-22 Farbwerk
DE19859437 1998-12-22

Publications (2)

Publication Number Publication Date
EP1013418A1 EP1013418A1 (fr) 2000-06-28
EP1013418B1 true EP1013418B1 (fr) 2003-09-17

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US (1) US6427591B1 (fr)
EP (1) EP1013418B1 (fr)
JP (1) JP4402229B2 (fr)
DE (2) DE19859437A1 (fr)
IL (1) IL133620A (fr)

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CN113910753B (zh) * 2021-10-11 2023-06-23 邵东市湘泰彩印包装有限公司 一种针对不同型号塑料袋印刷的凹版印刷机

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DE19745136B4 (de) * 1996-10-17 2007-07-12 Heidelberger Druckmaschinen Ag Rotationsbogendruckmaschine
DE19704003A1 (de) * 1997-02-04 1998-08-06 Kba Planeta Ag Verfahren und Vorrichtung zum Eindrucken von individualisierenden Kennzeichnungen
JPH10264351A (ja) * 1997-03-28 1998-10-06 Riso Kagaku Corp 複式印刷装置及び複式印刷装置における記録方法
DE19743770A1 (de) * 1997-10-02 1999-04-08 Heidelberger Druckmasch Ag Verfahren zum Betrieb einer Rotationsdruckmaschine und Vorrichtung zur Durchführung des Verfahrens
JPH11139016A (ja) * 1997-11-14 1999-05-25 Hitachi Koki Co Ltd ソリッドインク印刷原版及びその作製方法
US5980136A (en) * 1998-04-23 1999-11-09 Xerox Corporation Drum platen type printing machine for printing on regular and card-stock substrates

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DE59907008D1 (de) 2003-10-23
IL133620A0 (en) 2001-04-30
IL133620A (en) 2003-06-24
DE19859437A1 (de) 2000-06-29
JP4402229B2 (ja) 2010-01-20
JP2000185391A (ja) 2000-07-04
EP1013418A1 (fr) 2000-06-28
US6427591B1 (en) 2002-08-06

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