EP0657288B1 - Procédé pour alimenter en encre une machine d'impression - Google Patents

Procédé pour alimenter en encre une machine d'impression Download PDF

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Publication number
EP0657288B1
EP0657288B1 EP94118168A EP94118168A EP0657288B1 EP 0657288 B1 EP0657288 B1 EP 0657288B1 EP 94118168 A EP94118168 A EP 94118168A EP 94118168 A EP94118168 A EP 94118168A EP 0657288 B1 EP0657288 B1 EP 0657288B1
Authority
EP
European Patent Office
Prior art keywords
printing
ink
zones
printing ink
supply
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
EP94118168A
Other languages
German (de)
English (en)
Other versions
EP0657288A1 (fr
Inventor
Joachim Müller
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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
Priority claimed from DE19934341011 external-priority patent/DE4341011C2/de
Priority claimed from DE4429481A external-priority patent/DE4429481C2/de
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0657288A1 publication Critical patent/EP0657288A1/fr
Application granted granted Critical
Publication of EP0657288B1 publication Critical patent/EP0657288B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys

Definitions

  • the invention relates to a method for supplying printing ink according to the preamble of claim 1.
  • printing ink is supplied via an ink fountain roller, an elevator roller arranged intermittently between the ink fountain roller and a first friction roller, further inking rollers on a plate cylinder with a tensioned printing plate and then on a blanket cylinder on the sheet-shaped printing material.
  • the printing ink can be set differently zonally across the printing direction.
  • the lifter stroke and the width of the lifter strip can be adjusted according to the color requirements of the printing form (printing plate).
  • an ink flow arises in that an ink gap is generated on the ink fountain roller in accordance with the ink requirement on the printing form by the metering elements.
  • the splitting processes with the siphon roller and the other inking unit rollers result in a drop in the layer thickness of the printing ink, which is directed in the direction of the printing form, that is to say it decreases from the ink fountain roller to the printing form.
  • the greater the layer thickness gradient of the printing ink in a zone the greater the color flow in the associated zone, so that more ink is supplied in accordance with the proportion of the printing area.
  • the basics in connection with ink flow and ink layer thickness gradient are known from DE 3 338 143 C2. This previously known method however, relates to a measure for the targeted pre-filling of an inking unit in order to obtain a color distribution in the inking unit that is close to the production run as quickly as possible.
  • DE 41 28 537 C2 discloses a method for running in the ink at the start of printing or after printing interruptions, in which an inverse color profile is set. According to this document, however, the proposed filling process of the inking unit has to take place before the paper run, that is to say also when the inking rollers are switched off.
  • the extent to which the supply of printing ink has to be increased or reduced is determined by evaluating the color on the printed product (printed sheet). In a simple case, this can be checked visually by the printer. It is also known, for example in a print control strip at the beginning or end of the sheet, to include measuring fields for each color and each zone, which are scanned photoelectrically, in particular densitometrically, and then these actual values in conjunction with predetermined target values for setting values for the ink guide members (position Color metering elements, lift strip width, lift cycle) can be converted. Using a traversing densitometer or other trained measuring head Such a pressure control line can be scanned automatically and the recorded values can be converted into the corresponding control data by means of a downstream computer.
  • the lifter inking units of sheetfed offset printing presses have a very large surface area and thus a pronounced transmission inertia.
  • a change in the ink guide elements on the input side (ink metering elements, lifting strip width, lifting stroke) therefore always requires a larger number of sheets until a steady state with regard to the coloring on the printing material is established.
  • a supply of printing ink that is to be set very low is usually achieved by setting a high lifting cycle (1: 6, 1: 9 etc.) in connection with a small lifting strip width. This ensures that the color metering elements can be controlled not in their lower but in the middle setting range. In certain cases this allows for more differentiated control of the coloring on the printing sheet, but this method fails with an extremely small proportion of the printing area on the printing form. Because of the low ink flow, the ink absorbs too much dampening solution, i.e. emulsification takes place. Furthermore, this previously known method does not improve the transient response, i.e. the time span between a correction made and an established stable color state on the printing material.
  • An automatic color control system also triggers adjustment processes in the individual zones for the reasons mentioned above, which still trigger this temporal vibration behavior. The fault is therefore not remedied, but additionally amplified.
  • the object of the present invention is therefore to expand a method according to the preamble of claim 1 such that, with a small proportion of printing area on the printing form and avoiding additional procedural difficulties, the settling time between an existing coloring state and a next coloring state can be shortened as effectively as possible .
  • the measure according to the invention consists in the fact that a gradient in the layer thickness of the printing ink which decreases from the ink fountain roller in the direction of the printing form is not exclusively set transversely to the printing direction.
  • An oppositely directed ink flow is thus generated in at least one zone and at least for a certain period of time in a part of the inking unit, that is to say a layer thickness gradient is set which decreases towards the lifter and ink fountain roller.
  • This color flow for example set in certain zones and running in the opposite direction, must therefore be compensated for by a correspondingly higher color flow in the other zones in order to be able to cover the entire ink requirement of the printing form.
  • the type of control of the supply of printing ink according to the invention results in a significant reduction in the settling time from one color state to the next. This results in a significant reduction in waste.
  • the tuning process is shortened by the method according to the invention. It is also possible to dispense with the printing of additional ink removal surfaces that do not belong to the subject. The problem of emulsification with low color flow is also eliminated.
  • a particular advantage of an embodiment of the invention also results in the fact that when every second ink metering element is closed, that is to say only ink supply in the intermediate zones, there is no need for a color presetting by optical scanning of the printing plate. Inaccurate color presetting values due to the incorrect interpretation of brightness fluctuations as a proportion of the printing area are thus avoided.
  • ink metering elements are placed firmly on the ink fountain roller, that is to say there is no ink supply in these zones. So that a sufficiently uniform, in particular constant level of coloration also results in the closed zones, it is now calculated from the measured values at the measuring fields of the zones with closed color metering elements by how much more or how much less the color metering elements in the open zones have to be adjusted. This measure also makes it possible to drive a low, in particular the lowest, adjustable lifting stroke on the machine and also to select the maximum lifting strip width as possible. The color metering elements in the open zones can therefore be controlled in the middle setting range.
  • a low lifter cycle here means that only a small number of machine revolutions are carried out during a lifter movement, that is to say the lifter runs to the machine only slightly reduced.
  • the amount by which the color supply in the adjacent, open zones has to be changed is then calculated from the measured value within a closed zone and the measured values of the zones adjacent on both sides in conjunction with the predetermined target value.
  • the method according to the invention can basically be carried out in four procedural versions. Furthermore, these procedures are explained using the four drawings.
  • FIG. 1 symbolically shows an ink fountain roller FW and the layer thicknesses SD of the printing ink set thereon in the individual zones Z. As is known, these are produced by color metering elements (not shown) in connection with an ink fountain. It is indicated that only in every second zone Z one of zero different layer thickness SD is set. In the zones Z between them, the layer thickness SD is therefore zero. The corresponding ink metering elements are fully attached to the FW ink fountain roller.
  • the area of the inking unit is symbolically represented by F below the ink fountain roller FW.
  • the inking unit F ends on the surface of the printing form marked with D.
  • a color flow into the inking unit F is thus generated in only every second zone Z by generating a layer thickness SD.
  • This is indicated by the length and the direction of the arrows drawn in the inking unit F below the ink fountain roller FW.
  • the layer thickness SD is always zero, i.e. there is no supply of printing ink, rather a smaller amount of printing ink is returned to the ink fountain. This shows the length and direction of the associated arrows in the corresponding zones Z.
  • the ink layer thicknesses SD in certain zones Z are always zero during printing, i.e. the corresponding dosing elements remain fully attached to the FW ink fountain roller.
  • a circulation of printing ink thus arises in a certain way precisely in the upper part of the inking unit F.
  • the backflow of ink directed towards the ink fountain roller FW and thus toward the ink fountain is compensated for by a correspondingly greater ink flow in the zones Z with a non-zero layer thickness SD of printing ink.
  • the color on the printing material is to be changed, this is done merely changing the layer thickness SD of the printing ink in those zones Z in which the layer thickness SD is set to be different from zero.
  • the ink metering elements located in between therefore remain attached to the ink fountain roller FW.
  • the resulting stronger ink flow in the zones Z with a layer thickness that is set differently from zero has the effect that a change in the ink supply causes a stable ink state on the printed sheet more quickly, that is to say a new ink state is reached after a shorter time.
  • the ink metering elements are set completely against the ink fountain roller FW, that is to say there is always no supply of printing ink in these zones Z.
  • the ink is then supplied exclusively in the intermediate, open zones Z.
  • the zones Z, in which no supply of printing ink is to take place are determined on the printing form D as a function of the subject distribution will.
  • the proportion of printing area of the printing form D can be determined in a known manner by photoelectric scanning.
  • the printing form D has a very small proportion of the printing area (in the order of magnitude less than 10%), but the individual printing elements are relatively evenly distributed over the format of the printing form, then zeroing the e.g. every second color metering element is not taken into account the subject distribution possible.
  • zeroing the e.g. every second color metering element is not taken into account the subject distribution possible.
  • Such a situation arises, for example, when printing special colors in packaging printing, when the individual elements to be printed are very small and are distributed over the entire printing form with great benefit.
  • the embodiment variant of the invention described here is very advantageous with an extremely low proportion of printing area (order of magnitude 5% and below). Instead of one at very small amount of printing area often leading to incorrect settings due to a plate scan, it is now possible to start with a color profile in which in every second zone Z the color metering elements are set to zero and in the zones Z in between the color metering elements to a fixed, preferably set empirically determined value. As soon as a first stationary coloring state is determined, the ink supply can then be corrected by adjusting the ink metering elements in the open zones Z in accordance with the existing over and under coloring.
  • the method described above has the advantage over color presetting by means of plate scanning that the printing is not started with too much color.
  • a color presetting by means of plate scanning delivers excessively high presetting values, especially in the case of small printing areas, since darker parts in the non-printing plate background are interpreted as portions of the printing area and are consequently converted into setting values that are too large for the ink metering elements.
  • the printing form D has a medium or high ink requirement in certain zones Z and a low ink requirement in the other zones, provision can also be made in the zones Z with a high ink requirement to adjust the supply of printing ink via the ink fountain roller FW in the usual manner, i.e. in each zone Z to set a non-zero layer thickness SD of printing ink and in zones Z with a low ink requirement certain zones Z, as described above, to be provided with a layer thickness SD equal to zero.
  • This procedure is particularly advantageous if the lowest possible lifting stroke and the largest possible lifting strip width are set on the lifting inking unit of the printing press.
  • FIG. 2 shows in the form of a diagram the setting of a layer thickness SD plotted against the number of printed sheets BZ in any zone Z (FIG. 1).
  • printing ink is supplied over the entire width of the ink fountain roller FW in the usual way (in all zones).
  • the layer thicknesses SD (position of the color metering elements) set in the individual zones Z are taken, for example, from a photoelectric scan of the portion of the printing area.
  • the number of printed sheets BZ, ie the machine cycle, is plotted on the abscissa.
  • the layer thickness SD and thus the corresponding positions of the color metering elements are temporarily set completely to zero. After a certain period of time (machine revolution), the previous layer thicknesses SD are then set again in all zones.
  • the indicated trapezoidal profiles result over the number of sheets BZ.
  • Essential to the invention in this version 2 is thus that the paint slides are open for a certain time and in turn are closed for a certain time. This means that there is occasional ink supply and - with the slides closed, the lifter continues to run - ink removal with the slides closed.
  • the measure of temporarily opening and closing the ink metering elements described above results in that at times ink from the ink fountain roller FW into the inking unit F and at times also from the inking unit F back onto the ink fountain roller FW and thus the ink fountain is promoted back.
  • This also results in this measure according to the invention that, because of the temporary color reflux, significantly higher layer thicknesses SD must be set on the ink fountain roller FW by opening the ink metering elements accordingly.
  • significantly greater layer thickness drops of printing ink result in all zones Z.
  • the ink metering elements are set to a new layer thickness SD in the individual zones Z provided or in all zones Z. Since there is only a temporary drop in the layer thickness of the printing ink, the settling time now also decreases from one stationary color level to the next.
  • the times within which the ink metering elements are opened and closed are adjusted in such a way taking into account the geometry of the inking unit, so that no over- or under-coloring on the printing material is triggered by this clocked ink supply.
  • the thickness of the ink film on the inking rollers interacting with printing form D therefore always remains the same.
  • the embodiment according to the invention according to version 2 can be automatically maintained by a controller during the entire printing process.
  • a controller can also be used to have the temporary opening and closing of all the color metering elements triggered one or more times by an operator. The operator can then use the temporary doctoring function specifically when the danger of over-coloring is to be feared.
  • this area described procedure of temporarily closing and opening the ink metering elements is limited to those zones Z which belong to the small portion of the printing area of the printing form D.
  • a device is shown, by means of which the ink can be removed temporarily or continuously from the upper part of the inking unit.
  • the part of the inking unit shown here consists of an ink fountain roller FW with an indicated ink fountain, of a lifting roller HW1, which is cyclically actuated against the ink fountain roller FW and a grater R.
  • the Reiber R is in contact with another roller of the inking unit.
  • the inking roller HW1 takes place in the usual way, the ink transport from the ink fountain roller FW to the Reiber R and thus into the rest of the inking unit.
  • the lifting roller HW1 there is a further intermittent lifting roller HW2, which can be adjusted temporarily on the grater R and temporarily on an ink-removal roller FA arranged in particular above the ink fountain roller FW.
  • the ink applied to the ink take-off roller FA - coming from the lifting roller HW2 - can be conveyed back into the ink fountain cooperating with the ink fountain roller FW.
  • a doctor device in particular consisting of zone-wide tongues, can be provided, with the doctor device R or another roller of the here Color work not shown explicitly can be dissipated in particular zonally.
  • the constant or only occasional removal of printing ink results in a substantially greater drop in layer thickness from the ink fountain roller FW in the direction of the printing form with regard to the printing ink supply.
  • the color density value of the corresponding measuring field (full tone) determined in each zone is represented by a dot.
  • the dashed line running parallel to the abscissa represents the desired value of the solid color density value to be achieved.
  • the ink supply currently set and leading to the corresponding ink density values, that is to say the gap width of the corresponding ink metering element of the zone is indicated.
  • the ink supply in the zones Vietnamese i - 2, i, i + 2, .... is set to zero, ie the ink metering elements of these zones are fixed against the ink fountain roller.
  • the zones in between ...., i - 1, i + 1, .... there is a color supply by setting the Color dosing elements. So there is an ink supply in the manner of a comb squeegee on the ink fountain roller.
  • the full-tone color density DV determined in the measuring fields of the full tone is above the target value in zones i-2, i-1, while the measured color density values in zones i, i + 1, i + 2 are lower are than the specified target color density.
  • the color density must therefore be reduced in zone i-1, increased in zone i and likewise increased in zone i + 1. If only the adjustment variable for the color metering element in zone i - 1 and the adjustment variable for the color metering element in zone i + 1 were calculated on the basis of the target / actual differences in the associated zones i - 1, i + 1, this would result Because of the lateral color flow (cross-rubbing), the color density in zone i is brought closer to the specified target value, but it cannot be ruled out that the target-actual difference remaining in zone i still remains outside a specified tolerance range.
  • every second zone was defined as to be closed with the corresponding color metering elements.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)

Claims (11)

  1. Procédé pour amener des encres dans l'unité d'encrage à preneur d'une machine d'impression, en particulier une machine d'impression offset à feuilles, durant l'impression l'amenée étant réalisée en correspondance aux besoins d'encre du cliché, transversalement à la direction d'impression, par zones de façon différente, à chaque fois par le réglage d'un gradient d'épaisseur de couche de l'encre, dirigé vers le cliché,
    caractérisé en ce qu'au moins dans une zone et au moins pour une durée déterminée, un transport vers l'arrière d'encre est réalisé par le réglage d'un gradient d'épaisseur de couche, dirigé en sens opposé, et dans au moins une zone supplémentaire, une compensation de l'encre transportée en sens opposé est réalisée par une amenée d'encre renforcée.
  2. Procédé selon la revendication 1,
    caractérisé en ce que dans des zones déterminées, aucune amenée d'encre n'est réalisée.
  3. Procédé selon la revendication 2,
    caractérisé en ce que les zones, par l'intermédiaire desquelles aucune amenée d'encre ne doit être réalisée, sont fixées à partir de la proportion de surface à imprimer du cliché.
  4. Procédé selon l'une des revendications 2 ou 3,
    caractérisé en ce qu'à chaque fois de façon alternative dans des zones, une amenée d'encre est réalisée et dans les zones situées entre, aucune amenée d'encre n'est réalisée.
  5. Procédé selon l'une des revendications 1, 2 ou 4,
    caractérisé en ce qu'au début d'impression, au lieu d'un préréglage de l'unité d'encrage, à partir d'une détection de plaque d'impression dans des zones prévues, on supprime l'amenée d'encre, et dans les zones restantes, l'amenée d'encre est réglée à des valeurs fixes prédéfinies.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que, le preneur continuant à fonctionner, l'amenée par zone d'encre est interrompue complètement pour une durée déterminée.
  7. Procédé selon la revendication 6,
    caractérisé en ce que, le preneur continuant à fonctionner, l'amenée par zone, ainsi que l'interruption complète de l'amenée par zone, sont répétées de façon périodique, à chaque fois pour une durée déterminée.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que, l'unité d'encrage à preneur continuant à fonctionner, on réalise une réduction de l'encre dans l'unité d'encrage, avec une amenée d'encre par zone non modifiée.
  9. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que, pour une unité d'encrage à preneur présentant une cadence de preneur réglable, la cadence de preneur la plus réduite possible, c'est-à-dire la démultiplication la plus réduite du preneur par rapport à la machine, est réglée.
  10. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que, pour une unité d'encrage à preneur présentant une largeur de bande de preneur réglable, on règle la largeur de bande de preneur la plus élevée possible.
  11. Procédé selon l'une des revendications 2, 3, 4 ou 5,
    caractérisé en ce que sur le produit d'impression, on imprime sur chaque zone, des champs de mesure pouvant être détectés de façon photoélectrique, à partir de ces valeurs effectives en liaison avec des valeurs prescrites prédéfinies, la quantité d'encre à amener par zone étant détectée, et en ce que l'amenée d'encre dans les zones sans amenée d'encre est réalisée par un réglage correspondant de l'amenée d'encre dans des zones adjacentes, le réglage de la quantité correspondante de l'encre à amener dans les zones avec une amenée d'encre étant réalisé à partir d'une comparaison prescrite-effective des valeurs de mesure dans les zones, avec et sans amenée d'encre.
EP94118168A 1993-12-02 1994-11-18 Procédé pour alimenter en encre une machine d'impression Expired - Lifetime EP0657288B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE4341011 1993-12-02
DE4341010 1993-12-02
DE19934341011 DE4341011C2 (de) 1993-12-02 1993-12-02 Verfahren zur Steuerung der Zufuhrmenge von Druckfarbe bei einer Druckmaschine
DE4341010 1993-12-02
DE4429481A DE4429481C2 (de) 1993-12-02 1994-08-19 Verfahren zum Zuführen von Druckfarbe bei einer Druckmaschine
DE4429481 1994-08-19

Publications (2)

Publication Number Publication Date
EP0657288A1 EP0657288A1 (fr) 1995-06-14
EP0657288B1 true EP0657288B1 (fr) 1997-04-09

Family

ID=27205822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118168A Expired - Lifetime EP0657288B1 (fr) 1993-12-02 1994-11-18 Procédé pour alimenter en encre une machine d'impression

Country Status (3)

Country Link
EP (1) EP0657288B1 (fr)
JP (1) JP3121999B2 (fr)
AT (1) ATE151347T1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128537A1 (de) * 1991-08-28 1993-03-04 Heidelberger Druckmasch Ag Verfahren zum einstellen eines fortdruckfarbprofils

Also Published As

Publication number Publication date
EP0657288A1 (fr) 1995-06-14
JPH07251498A (ja) 1995-10-03
JP3121999B2 (ja) 2001-01-09
ATE151347T1 (de) 1997-04-15

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