EP0093879B1 - Procédé et dispositif de dosage d'encre dans les rotatives offset - Google Patents

Procédé et dispositif de dosage d'encre dans les rotatives offset Download PDF

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Publication number
EP0093879B1
EP0093879B1 EP83103480A EP83103480A EP0093879B1 EP 0093879 B1 EP0093879 B1 EP 0093879B1 EP 83103480 A EP83103480 A EP 83103480A EP 83103480 A EP83103480 A EP 83103480A EP 0093879 B1 EP0093879 B1 EP 0093879B1
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EP
European Patent Office
Prior art keywords
ink
metering
cylinder
ink cylinder
metering device
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
Application number
EP83103480A
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German (de)
English (en)
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EP0093879A1 (fr
Inventor
Willi Jeschke
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
Original Assignee
Heidelberger Druckmaschinen AG
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Publication of EP0093879A1 publication Critical patent/EP0093879A1/fr
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Expired legal-status Critical Current

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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
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices

Definitions

  • the invention relates to a method and a device for metering the color in offset printing machines according to the preamble of claim 1.
  • EPU, EPA-0 078 444 is a so-called short inking unit, in which no large number of inking units are provided, which processes the amount of ink supplied into a very thin ink film, as required for inking the printing plate becomes.
  • the problem with these inking units is to feed this thin ink film of a few f.Lm thickness absolutely evenly over the plate length and in a constant thickness during printing. Even the production of such a thin and absolutely constant color film was not suggested by the prior art.
  • the inking of the application roller takes place in the known embodiment by means of an ink reservoir, which is arranged in the area of the lateral surface of the application roller.
  • the excess paint is wiped off the outer surface with a color knife until the ink film required in the respective zone just remains on the outer surface of the application roller.
  • This ink film is then evened out by two rollers before it is applied to the printing plate.
  • the ink knife acting as a metering body is pressed in the known embodiment under such high pressure against the elastic outer surface of the applicator roller that its surface is impressed considerably in the area of the scraper edge, so that an ink film can be produced in the desired small film thickness.
  • the application roller is driven at the peripheral speed of the plate cylinder.
  • the heat generated by the color knife which is set as hard as described, not only leads to early fatigue of the material, but also to a considerable increase in temperature. Since the temperature has a significant influence on the viscosity of the paint, the amount of paint transferred changes considerably.
  • the rubber jacket creates a natural vibration that leads to changes in the color gap and thus also to color fluctuations. This vibration depends on the respective recovery capacity of the material, i. H. also from his state of fatigue. An exact and high-quality inking of the printing plate is impossible because with the known design a reproducible, i.e. H. constant amount of paint cannot be set in all operating conditions.
  • the object of the invention is a method and to create an ink metering device for carrying out the method for producing an absolutely uniform and reproducible ink supply in offset printing presses, which ensures exact regulation of the inking of the plate cylinder in an inking unit with only a few inking unit rollers with little effort.
  • the object is achieved by the features of claim 1, claims 2 and 4 having an additional control circuit and an additional coolant circuit.
  • the advantage achieved with the described solution is that, given the dynamic pressure of the ink, a constant, predeterminable layer thickness is achieved by regulating various parameters due to the physical laws, so that even when the hydrodynamic pressure changes, the ink is precise and uniform Printing result is achieved.
  • the use of a rigid ink cylinder considerably restricts the number of interferences, wear and tear on the outer surface of the ink cylinder and color fluctuations due to the rigid outer surface of the ink cylinder being excluded.
  • a thin ink film which is always fed to the printing form in the same layer thickness generally does not need to be adapted to the ink consumption which differs zonally across the width of the form.
  • Fig. 1 shows schematically an offset printing machine, in which the sheets to be printed are fed in a known manner via a feeder 1 to a printing cylinder 2, which cooperates with a blanket cylinder 3 and a plate cylinder 4. The print image is thus transferred from the plate cylinder 4 via the rubber cylinder 3 to the sheet to be printed on the printing cylinder 2. After printing, the sheet is fed from a chain delivery 5 to a delivery stack 6.
  • the plate cylinder 4 is assigned an inking roller 7, which has an elastic jacket surface and preferably has a plate cylinder diameter.
  • the inking roller 7 in turn receives its color from an ink cylinder 8, which has an outer surface made of rigid material, for. B. metal is provided.
  • the dampening unit 9 transfers the dampening solution via the two applicator rollers 10 and 11 to the ink cylinder, the last applicator roller 11, viewed in the direction of rotation, being pivotally mounted on the plate cylinder 4 for faster moistening (shown in broken lines).
  • the ink cylinder 8 is assigned a metering body 12, which is supported on a crossmember 13, which is fastened to the side frames, via compression springs with a flat characteristic curve and ball joints 19.
  • the ink supply 14 is located in the gap between the ink cylinder 8 and the metering body 12.
  • sensors 15 are provided which measure the layer thickness of the ink on the ink cylinder 8.
  • the embodiment according to FIG. 2 differs in that 8 cross members 16 and 17 are provided on both sides of the ink cylinder.
  • a metering body 18 is supported on the crossmember 16 via a ball joint 19 and a pressure medium cylinder 20.
  • the pressure cylinder 20 with the ball joints. 19 are arranged along the length of the ink cylinder in close succession, so that with the same loading of the pressure medium cylinder 20 there is a contact pressure evenly distributed over the entire width of the ink cylinder 8.
  • the control of the exposure takes place as a function of the viscosity of the ink in the metering gap and / or the dampening agent supply and / or the peripheral speed of the ink cylinder, such that a constant, predeterminable layer thickness of the ink on the ink cylinder or a constant, predeterminable intensity of the color impression on the printing substrate given is.
  • the layer thickness of the paint can be precisely measured here via the sensors 15, which are arranged in zones. A zonal influencing of the layer thickness is indivi duel differentiated loading of the pressure medium cylinder 20 may be possible.
  • a supporting body 21 is supported on the crossmember 17 and is also pressed in zones by pressure medium cylinders 22 via ball joints 23.
  • Each pressure medium cylinder 22 can thus exert the same pressure as the opposite pressure medium cylinder 20, so that the pressure forces acting on the ink cylinder cancel each other out. This reliably prevents the ink cylinder 8 from bending.
  • the ink cylinder 8 has a chamber 24 which can be filled with a cooling liquid. This ensures that the temperature of the ink and the ink cylinder 8 in a decoupled control loop, regardless of the pressure of the ink, is kept constant in the metering gap on a given work.
  • FIG. 3 shows a color metering device according to FIG. 2 in a partial longitudinal section with a mounting of the ink cylinder 8 via roller bearings 25 in the machine side frames 26 and 27.
  • the outer surface 28 of the ink cylinder 8 is made of metal and rests on the end faces and sealing jaws 29 for the ink . These in turn are attached to the trusses 16 and 17.
  • the chamber 24 is connected via the bore 30 to a coolant circuit, not shown.
  • the embodiment of the ink metering device according to FIG. 4 differs in that a U-shaped metering body 31 is provided parallel to the longitudinal axis of the ink cylinder 8, the two legs 32 and 33 of which comprise the ink cylinder 8.
  • both the metering surface 34 abuts on the leg 32 and the support surface 35 on the leg 33 tangentially on the outer surface of the ink cylinder 8.
  • the metering surface 34 and the support surface 35 are inclined to each other by a small angular dimension, but run exactly parallel to one another in their longitudinal direction.
  • the dosing body 31 can be moved more or less towards the roller or away from it by means of ball joints 38. Due to the inclined configuration of the metering surface 34 and the support surface 35 can thus be the radial displacement of the metering body, for. B. to the lateral surface of the ink cylinder 8 towards the ink gap, so that a smaller amount of ink is supplied to the plate cylinder 4.
  • This design which in itself makes the pressure equalization simple, can advantageously be used in narrow machines.
  • the required spacing precision or parallelism of the legs 32, 33 can be achieved there inexpensively.
  • the supply of ink 46 between the metering plate 40 and the ink cylinder 8 can be supplemented via the feed line 45.
  • a piston 36 pressurized with pressure medium is supported on a cross member 37 and moves the metering and support plate 40, 41 more or less far over the lateral surface of the ink cylinder 8 via a ball joint 38.
  • the ink metering device can follow the positional deviations of the ink cylinder 8. Due to the inclined arrangement of the metering plate 40 to the support plate 41 in accordance with the angles a and the change in the starting pressure, the thickness of the ink gap and thus the amount of ink supplied to the plate cylinder 4 can be changed.
  • FIG. 6 differs from FIG. 5 in that the adjustment is carried out manually by means of adjusting screws 47 which are arranged in a fixed crossmember 48. By turning the adjusting screw 47, the ink metering device can be adjusted relative to the ink cylinder 8 in the manner described.
  • zone-regulating screws 50 are provided, which act on a tongue 52 formed by a longitudinal slot 51.
  • the amount of paint could also be individually regulated in zones, a tear-off edge 53 being provided in the direction of rotation, at the end of the tongue, which prevents paint from collecting and dripping off.
  • a support plate 54 is also provided, in which a similar tongue 55 can be adjusted via adjusting screws 56.
  • a drip edge 57 is provided on the tongue 55, from which paint can drip into a groove 58.
  • a turnbuckle 61 is provided in the upper part thereof, which regulates the angular position of the two plates via a threaded spindle 62 to each other.
  • the elastic spacer plate 63 forms the fulcrum and at the same time serves to mount the ink metering device via the bearing bolts 64, which are fastened on both sides in the machine frames.
  • the bridge 67 serves as a fulcrum for the metering plate 68.
  • the screws 69 are rotated in such a way that the metering body 70 also circular cross section is made more or less to the outer surface of the ink cylinder 8.
  • Bearing bolts 71 fastened in the side frames prevent the ink metering device from rotating.
  • the opposite support plate 72 is provided with a plurality of sliding shoes 73, between which the ink on the lateral surface of the ink cylinder 8 can be returned to the ink supply 46.
  • the cross section of the sliding shoes is acute as viewed in the direction of arrow A, as drawn.
  • the embodiment according to FIG. 8 differs from the embodiment 7a in that the bearing pins 71 engage directly in the bridge 74.
  • a film 75 is provided in this embodiment, which can be wound on rollers 76. Only one of the two rolls, preferably the roll for winding up the soiled film, has to be rotated a little further and immediately there is again a new film section in the area of the metering surfaces.
  • Deflection rollers 77 are provided within the ink metering device, which prevent the film from being placed on the ink cylinder 8.
  • the paint is supplied via a separate channel 78 in which the supply of fresh paint 79 is located.
  • the channel can be adjusted in the direction of the lateral surface of the ink cylinder 8 via the adjusting screw 80.
  • the color of the ink cylinder 8 is then pre-metered between its outer surface and the film in the region of the support plate 72 by the rotary movement of the ink cylinder and the color conveyed is made more uniform in the region of the metering plate.
  • the amount of paint supplied to the plate cylinder can be very finely regulated using the screws 69.
  • FIG. 9 and 10 differ from FIG. 8 in that the scraper bodies 82 and 83 are concave and are supported on bolts 84.
  • the adjusting screws 85 between the two arms 86 and 87 By turning the adjusting screws 85 between the two arms 86 and 87, the convex shape of the doctor body 82, 83 can be changed somewhat, so that this also enables a sensitive regulation of the color supplied.
  • the feed of the. Color 88 takes place in the example of FIG. 9 via a shell 89, which can also be adjusted with respect to the ink cylinder 8 by means of an adjusting screw 80.
  • the paint connection 90 is attached to a distributor bar 91 with paint and 92.
  • a metering plate 93 and a support plate 94 are also assigned to the ink cylinder 8. Both are supported on pistons 95, which are pressurized by pressure medium, on fixedly mounted cross members 96, 97. Due to the exact opposite arrangement of the pressurized medium provided in zones. Pistons 95, the two opposite pistons can be connected in parallel via the pressure medium supply line, so that the mutual pressure is absolutely the same and thus cancels, so that no one-sided forces act on the ink cylinder 8.
  • the surface doctor blades 94 and 93 are designed to be flexible.
  • the pressure medium cylinder pairs 95 which are uniformly distributed and evenly distributed several times over the width, are subjected to the same pressure, so that the same color gap appears along the width, regardless of local shape or position errors. This version is particularly suitable for relatively wide machines.
  • the exemplary embodiment according to FIG. 12 shows a cylindrical scraper body 98, which is supported on pistons 99, which are acted upon by pressure medium, on a fixed crossmember 100.
  • the scraper body 98 is driven by a drive (not shown), the speed per unit of time, regardless of the machine speed, being chosen to be very low (a few revolutions per hour).
  • the elastic roller-wide film 101 is also driven at exactly this speed, which in the exemplary embodiment shown is wound up again on a winding-up roller 103 by an unwinding roller 102 via the doctor body 98.
  • An endlessly circulating film can also be used in the same way.
  • the ink supply 104 is located between the upper leg of the film 101 and the outer surface of the ink cylinder 8. In this embodiment, dirt particles or dried-up paint residues cannot get stuck, so that an exact regulation of the amount of paint is possible.
  • the embodiment according to FIG. 13 differs in that a color knife 105 which is tangential to the ink cylinder 8 is provided and is attached to a crossmember 106 which can hold coolant in a chamber 107 for cooling the ink supply 108.
  • a pressure hose 109 is provided, which is supported in a pipe segment 110. Both the pipe segment 110 with the pressure hose 109 and the traverse 106 with the color knife 105 can be pivoted away via the pivot point 111. If a pressure medium is introduced into the pressure hose 109 in the swiveled-in position, it bulges more or less outwards and presses the ink knife 105 against the outer surface of the ink cylinder 8. This can be used to sensitively regulate the color gap and thus the amount of paint supplied.
  • a coolant 112 can also be introduced into the ink cylinder 8 in this exemplary embodiment.
  • the color knife 105 can also be designed as a hard film which is fastened to the fixed bearing 106 and is supported via the hose 109 filled with pressure medium. This has the advantage that if the film is damaged or worn, an easy replacement of the same is possible. B. can be done by gluing.
  • Fig. 14 shows a diagram in which the Ver Relationships between the ink layer thickness and the specific contact pressure with different viscosity of the ink are reproduced. It can be clearly seen here that the color layer thickness on the ink cylinder 8 is smaller for a paint with low viscosity and the same contact pressure. The cooling provided allows the viscosity of the paint to be kept constant within narrow limits.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Coating Apparatus (AREA)

Claims (13)

1. Procédé de dosage de l'encre dans les machines à imprimer offset comprenant un cylindre d'encrage (8) auquel est associé un organe de dosage qui peut être serré contre le cylindre d'encrage avec une pression prédéterminée, et au maximum deux rouleaux toucheurs d'encrage (7) à surface élastique, qui sont placés en aval du cylindre d'encrage et dont le diamètre correspond à peu près au diamètre du cylindre porte-plaque, caractérisé en ce que la pression de serrage de l'organe de dosage (12,18, 31, 40, 49, 59, 70, 82, 83, 93, 98, 105) est réglée uniformément sur toute la longueur du cylindre d'encrage, en fonction de la viscosité de l'encre contenue dans la fente de dosage et/ou de l'amenée d'agent de mouillage et/ou de la vitesse circonférentielle du cylindre d'encrage (8), de manière à donner à l'encre située sur le cylindre d'encrage une épaisseur de couche constante, pouvant être prédéterminée, ou à donner une intensité constante, et pouvant être prédéterminée, à l'impression d'encre sur la matière à imprimer.
2. Procédé selon la revendication 1, caractérisé en ce que la température de l'encre et du cylindre d'encrage (8) est maintenue constante, à une valeur pouvant être prédéterminée, dans un circuit de réglage découplé du réglage de l'encrage et indépendamment de la pression de l'encre contenue dans la fente de dosage.
3. Dispositif de dosage de l'encre pour machines à imprimer offset, pour la mise en oeuvre du procédé selon la revendication 1, comprenant un cylindre d'encrage (8) auquel est associé un organe de dosage qui peut être serré contre le cylindre d'encrage avec une pression prédéterminée, et au maximum deux rouleaux toucheurs d'encrage (7) à surface élastique, qui sont placés en aval du cylindre d'encrage et dont le diamètre correspond à peu près au diamètre du cylindre porte-plaque, caractérisé en ce que le cylindre d'encrage (8) possède une surface latérale faite d'une matière rigide, et en ce que, contre le cylindre d'encrage (8), est serré au moins un organe de dosage (12,18, 31, 40, 49, 52, 70, 82, 83, 93, 98, 105), s'étendant parallèlement à l'axe du cylindre, muni d'une surface de dosage, et qui attaque tangentiellement la surface latérale du cylindre d'encrage, et en ce que l'organe de dosage prend appui sur un support fixe (13, 16, 37, 97, 100, 110) par l'intermédiaire d'un organe de réglage (20, 36, 95, 109) qui est chargé par un fluide sous pression. (Figures 1 à 14).
4. Dispositif de dosage de l'encre selon la revendication 3, caractérisé en ce que le cylindre d'encrage (8) présente une ou plusieurs chambre(s) (24) qui sont raccordées à un circuit de fluide de refroidissement (figures 2 et 3).
5. Dispositif de dosage de l'encre selon la revendication 3, caractérisé en ce que la distance entre la surface de dosage de l'organe de dosage (12, 32, 40, 59, 68, 82, 83,105) et la surface latérale du cylindre d'encrage (8) est variable. (Figures 1, 4, 5, 7 à 10, 13).
6. Dispositif de dosage de l'encre selon la revendication 3, caractérisé en ce qu'au cylindre d'encrage (8) sont associés deux organes de dosage (31, 40, 49, 59, 68, 82, 83) opposés, s'étendant parallèlement à l'axe du cylindre et qui attaquent la surface latérale du cylindre, ces organes étant prévus dans un ensemble de châssis commun, essentiellement rigide, destiné à absorber les efforts, et dont les surfaces de dosage présentent un certain écartement par rapport à la surface latérale du cylindre d'encrage, selon l'épaisseur désirée de la fente d'encrage (figures 4 à 10).
7. Dispositif de dosage de l'encre selon la revendication 3, caractérisé en ce que l'ensemble de châssis est monté de telle manière qu'il puisse suivre les écarts de forme et de position du cylindre d'encrage (8) (figures 4 à 10).
8. Dispositif de dosage de l'encre selon l'une des revendications 3 à 7, caractérisé en ce que l'ensemble de châssis encadre le cylindre d'encrage en étant en forme de U, dont les deux branches opposées (32, 33 ; 40, 41 ; 49, 54 ; 59, 60 ; 68, 72) présentent des surfaces de dosage appliquées tangentiellement, et qui sont disposées à un écartement constant par rapport au cylindre d'encrage (8), et dans une position parallèle à l'axe de ce cylindre (figures 4 à 8).
9. Dispositif de dosage de l'encre selon l'une des revendications 3 à 8, caractérisé en ce que la branche (32, 40, 49, 59, 68) qui reçoit la réserve d'encre et qui constitue l'organe de dosage, est serrée contre la surface latérale par une surface de dosage, tandis que la branche opposée (33, 41, 54, 60, 72) est serrée contre cette surface latérale par une surface d'appui, les surfaces de dosage et d'appui étant disposées dans des positions diagonalement opposées, et l'écartement entre la surface de dosage et la surface d'appui étant variable (figures 4 à 8).
10. Dispositif de dosage de l'encre selon l'une des revendications 3 à 9, caractérisé en ce que les surfaces de dosage et d'appui des branches (32, 33 ; 40, 41) sont inclinées l'une par rapport à l'autre d'un angle déterminé (alpha), et sont montées pour pouvoir se déplacer en translation en direction du cylindre d'encrage (8), la translation étant commandée par des pistons (36) chargés par un fluide sous pession (figures 4 à 6).
11. Dispositif de dosage de l'encre selon l'une des revendications 3 à 10, caractérisé en ce qu'au moins un organe de dosage (18, 93, 98) est appuyé sur une traverse fixe (16, 97, 100) par l'intermédiaire d'une pluralité de pistons (20, 95, 99) chargés par un fluide sous pression et juxtaposés (figures 2, 3, 11, 12).
12. Dispositif de dosage de l'encre selon la revendication 11, caractérisé en ce que la pression exercée sur les pistons chargés par un fluide sous pression (20, 95, 99) est réglée en fonction de l'épaisseur de couche d'encre mesurée en aval de la fente de dosage, de telle manière que, lorsque l'épaisseur de la couche décroît, la pression exercée sur les pistons soit réduite et que, lorsque l'épaisseur de couche croît, cette pression soit augmentée (figures 2, 3, 11, 12).
13. Dispositif de dosage de l'encre selon la revendication 11, caractérisé en ce que l'organe de dosage (98) est de configuration cylindrique, et est entraîné à un nombre de tours par unité de temps indépendant de la vitesse de la machine et très inférieur à ceiie-ci (figure 12).
EP83103480A 1982-05-11 1983-04-11 Procédé et dispositif de dosage d'encre dans les rotatives offset Expired EP0093879B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3217569A DE3217569C2 (de) 1982-05-11 1982-05-11 Verfahren und Vorrichtung zum Dosieren der Farbe bei Offsetdruckmaschinen
DE3217569 1982-05-11

Publications (2)

Publication Number Publication Date
EP0093879A1 EP0093879A1 (fr) 1983-11-16
EP0093879B1 true EP0093879B1 (fr) 1986-09-10

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EP83103480A Expired EP0093879B1 (fr) 1982-05-11 1983-04-11 Procédé et dispositif de dosage d'encre dans les rotatives offset

Country Status (7)

Country Link
US (2) US4699055A (fr)
EP (1) EP0093879B1 (fr)
JP (3) JPS5952657A (fr)
AT (1) AT388706B (fr)
CA (1) CA1219168A (fr)
DE (1) DE3217569C2 (fr)
ES (2) ES522257A0 (fr)

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JPH0629315B2 (ja) * 1985-05-29 1994-04-20 ユニチカ株式会社 微小球状樹脂組成物及びその製造法
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DE3714936A1 (de) * 1987-05-05 1988-12-08 Wifag Maschf Farbwerk fuer eine druckmaschine
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JP2542748B2 (ja) * 1991-03-28 1996-10-09 コニシ株式会社 接着剤組成物
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DE4413731C2 (de) * 1994-04-20 1998-07-02 Heidelberger Druckmasch Ag Verfahren zur Steuerung der Temperatur der Druckfarbe in einer Druckmaschine
CN1172797C (zh) 1996-10-25 2004-10-27 柯尼格及包尔公开股份有限公司 墨斗
DE19912881C2 (de) * 1999-03-23 2001-02-22 Technotrans Ag Vorrichtung zur Versorgung eines Farbspeichers einer Druckmaschine mit Farbe
DE10058550A1 (de) * 2000-11-24 2002-05-29 Heidelberger Druckmasch Ag Verfahren zur Regelung des Farb-zu-Feuchtmittelgleichgewichts in einer Rotations-Offsetdruckmaschine
US7546802B2 (en) * 2003-07-28 2009-06-16 Goss International Americas, Inc. Fluid supply device for a printing machine
DE102022101244A1 (de) 2022-01-20 2023-07-20 Koenig & Bauer Ag Verfahren zur Kalibrierung von Farbdosierelementen

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Also Published As

Publication number Publication date
US5020432A (en) 1991-06-04
ES8402205A1 (es) 1984-02-01
ATA117783A (de) 1989-01-15
ES8402206A1 (es) 1984-02-01
EP0093879A1 (fr) 1983-11-16
JPS58203059A (ja) 1983-11-26
AT388706B (de) 1989-08-25
ES522258A0 (es) 1984-02-01
JPS5952657A (ja) 1984-03-27
CA1219168A (fr) 1987-03-17
ES522257A0 (es) 1984-02-01
US4699055A (en) 1987-10-13
DE3217569C2 (de) 1985-11-28
JPS5952656A (ja) 1984-03-27
DE3217569A1 (de) 1983-11-17

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