EP0065138A1 - Dispositif d'encrage court pour une machine à imprimer - Google Patents

Dispositif d'encrage court pour une machine à imprimer Download PDF

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Publication number
EP0065138A1
EP0065138A1 EP82103607A EP82103607A EP0065138A1 EP 0065138 A1 EP0065138 A1 EP 0065138A1 EP 82103607 A EP82103607 A EP 82103607A EP 82103607 A EP82103607 A EP 82103607A EP 0065138 A1 EP0065138 A1 EP 0065138A1
Authority
EP
European Patent Office
Prior art keywords
roller
rollers
inking unit
short inking
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.)
Granted
Application number
EP82103607A
Other languages
German (de)
English (en)
Other versions
EP0065138B1 (fr
Inventor
Joachim Dorow
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.)
Albert Frankenthal AG
Original Assignee
Albert Frankenthal 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
Application filed by Albert Frankenthal AG filed Critical Albert Frankenthal AG
Publication of EP0065138A1 publication Critical patent/EP0065138A1/fr
Application granted granted Critical
Publication of EP0065138B1 publication Critical patent/EP0065138B1/fr
Expired legal-status Critical Current

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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
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/10—Applications of feed or duct rollers
    • B41F31/12—Applications of feed or duct rollers adjustable for regulating supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L27/00—Inking arrangements or devices
    • B41L27/04—Ducts, containers, or supply devices or ink-level control devices
    • B41L27/12—Feed or duct rollers

Definitions

  • the invention relates to a short inking unit for a printing machine that processes high-viscosity printing inks, in particular an offset printing machine, with a color memory provided in the area of the gap between two rollers arranged at one another and having different peripheral speeds for supplying a soft, smooth surface that can be adjusted to the printing plate mounted on a plate cylinder showing application roller with color.
  • An inking unit of this type is from DE-PS 23 23 025 known.
  • a so-called metering roller is employed on the soft applicator roller, which encloses the ink reservoir between itself and the applicator roller.
  • the metering roller is designed as a steel roller with a surface structure formed by small recesses or pores and interacts with an adjustable metering doctor.
  • the direction of rotation of the metering roller is selected so that there are opposite directions of rotation of the metering roller and application roller in the area of the gap between the metering roller and applicator roller.
  • the disadvantage here is that the gap between the applicator roller and metering roller is not exactly adjustable due to the flexibility of the rubber jacket of the applicator roller.
  • the application roller also changes the diameter ratios, so that not only do the set pressure forces or gap sizes change very quickly, which makes ongoing readjustment or readjustment necessary, but there can also be undesirable slippage between the application roller and the forme cylinder, which can lead to a bad inking and rapid wear of the printing form.
  • the doctor device required in the known arrangement is very complex and requires a large amount of space. Quite apart from this, the doctor blade of such a doctor device also represents a wearing part that has to be replaced relatively frequently.
  • Another disadvantage of the known arrangement can be seen in the fact that the ink fountain required here always requires a certain minimum filling and can therefore not be completely emptied, which has a negative effect on the ink consumption and requires a replacement of the ink fountain when changing colors.
  • Another disadvantage of this known arrangement can be seen in the fact that the final thickness of the ink film that can be achieved is always a fixed fraction of the initial thickness applied by the dipping roller immersed in the ink fountain to the inking unit roller interacting with it. It is therefore important in this known arrangement to transmit a uniform, very specific thickness with the dipping roller, but experience has shown that this is very difficult to achieve, especially when using tough colors.
  • ink is advantageously transported away from the rollers delimiting the memory at the outlet of the memory. Accordingly, ink splitting takes place, which already results in a thin ink film to be transported further to the applicator roller, the thickness of which is reduced even further in the region of one or more further nip locations.
  • the measures according to the invention thus lead to a thin ink film even without the use of a doctor blade.
  • the pairing of steel on steel in the area of the rollers delimiting the ink reservoir ensures uniformly high accuracy and uniformity of the ink flow leaving the reservoir. As a result of the directions of rotation being aligned in the same way, there is nevertheless only very little, practically negligible wear.
  • the color passing through the gap between two steel rollers acts practically as a lubricant.
  • the measures according to the invention make it possible to maintain an ink reservoir delimited by two rollers, which only takes up a comparatively small amount of fill during operation and whose filling can be used up practically completely, which has a positive effect on the ink consumption.
  • the invention Measures thus clearly guarantee a reliable, clear functioning, a high level of maintenance and ease of use and thus overall a high level of economy.
  • At least one further roller which has a steel jacket with a smooth surface, can follow in the direction of the ink film toward the printing form towards the rollers delimiting the memory, which roller unwinds on the application roller.
  • This measure proves to be particularly useful where it is important to produce a very thin film of color. In an advantageous manner, however, there are comparatively few disturbance variables, so that high accuracy can be expected.
  • all the rollers provided with a steel jacket can have the same diameter, which is preferably smaller than the diameter of the plate cylinder.
  • the peripheral speed of the fastest driven roller which has a steel jacket, in the direction of the ink flow to the printing form, corresponds to the peripheral speed of the printing form and thus preferably also to the peripheral speed of the application roller. This ensures that there is no slippage in the area between steel and rubber Processing results in what guarantees a particularly gentle and therefore low-wear operation.
  • the diameter of the application roller corresponds to the diameter of the printing form.
  • a further advantageous further development of the superordinate measures can consist in the fact that at least the rollers having a steel jacket are adjustably supported against each other or with respect to the application roller interacting therewith.
  • ge - ensures, that the film thickness so that the conditions of the individual case can be varied by means of the gap adjustment and adjustable.
  • a further regulation of the film thickness can be achieved in that the peripheral speeds of the rolls having a steel jacket, the peripheral speed of which increases with decreasing distance from the printing form, can be changed.
  • rollers having a steel jacket and / or the application roller each have a tubular jacket which is penetrated by a spindle supported against it by at least one support bearing, the ends of which protrude from the jacket in an associated control device are included.
  • These measures advantageously enable variable deflection compensation.
  • the roller in question can advantageously according to its load due to the hydrodynamic pressure in the gap between it and this together Acting roller are adjusted so that a uniform gap is created between the two rollers over the entire length of the roller.
  • the short inking unit shown in Fig. 1 consists of three equally large steel rollers 1 or 2 or 3 and an applicator roller 4 provided with a soft rubber jacket, which unwinds at the same speed on a printing plate clamped on an associated plate cylinder 5.
  • the diameter of the application roller 4 corresponds to the effective working diameter of the plate cylinder 5. With the help of this dimensioning, so-called stabilization, in which the printing elements of the printing form are no longer adequately colored, can be avoided.
  • the diameter of the steel rollers 1 to 3 is somewhat smaller than the diameter of the plate cylinder 5 and application roller 4.
  • the outer surface of the steel rollers 1 to 3 is smooth and unprofiled. The steel rollers 1 to 3 are driven by force.
  • the applicator roller 4 can also be positively driven or simply carried along by friction.
  • a color memory 6 which, in the area of the end faces of the rollers 1 and 2, lies against the flat end faces or through coils arranged on the end faces with a flat support Sheets 7 is limited.
  • the ink reservoir 6 is supplied with ink by a pumping station (not shown here) which is known per se.
  • the directions of rotation of the rollers 1, 2 or 2, 3 or 3, 4 or 4, 5 interacting with one another is selected so that the directions of rotation are in the same direction in the respective nip area, ie unwinding takes place, whereby wear is effectively prevented.
  • the speed of the steel rollers 1 to 3 differs in such a way that the steel roller close to the application roller runs fastest and the steel roller remote from the application roller runs slowest.
  • the peripheral speed of the roller 2 is therefore greater than that of the roller 1 and the peripheral speed of the roller 3 is greater than that of the roller 2.
  • the peripheral speed of the roller 2 relates to the peripheral speed of the roller 3 as about 4-5: 10
  • Roller 1 is about 1: 10 in relation to the peripheral speed of roller 3.
  • the peripheral speed of the front steel roller 3 which unwinds on the application roller 4 corresponds to the peripheral speed of the application roller 4, which in turn corresponds to the effective peripheral speed of the plate cylinder 5 or better said the printing form clamped thereon.
  • the applicator roller 4 which is provided with a comparatively soft rubber jacket, and the rollers which cooperate with it and have a hard surface, which has a positive effect on the prevention of wear.
  • the gap width between the individual rolls, in particular between the steel rolls 1 to 3, can be set precisely.
  • these rollers can simply be mounted in eccentric bushings rotatably accommodated in the housing.
  • the width of the gap between two rolls which are to be unwound in each case represents practically the initial value for the splitting process.
  • the adjustability of the gap width thus allows a variation in the achievable film thickness.
  • the rollers 1 to 3 can be driven with a fixed transmission ratio. A gear train can simply be used for this.
  • a gear train of the type mentioned above can be provided with change wheels. But it would also be easily conceivable to equip one or more of the driven steel rollers 1 to 3 with a variable drive.
  • the application roller 4 running at the peripheral speed of the plate and the front steel roller 3 which unwinds at the same speed are to be driven from the plate cylinder 5 by means of a gear train.
  • the two rear steel rollers 2 and 1 are each to be equipped with a variable drive. But it would also be conceivable to run the two rear steel rollers 2 and 1 with a fixed transmission ratio and to drive them with the aid of a common variable drive.
  • the adjustability of the gap widths and variation of the peripheral speed guaranteed in the illustrated embodiment enables the color flow to be adapted in many ways to the needs of the individual case, e.g. the color quality.
  • a thicker ink film is required on the printing form than when processing inks with a lot of color pigments. This can be accomplished simply by adjusting the gap widths and / or by varying the variable speeds.
  • At least one of two rolls interacting with one another is provided with variable deflection compensation.
  • all steel rollers 1 to 3 and the application roller 4 are to be provided with such a deflection compensation.
  • these rollers consist of a tubular jacket 8 which is coaxially penetrated by a spindle 9 with radial play.
  • the jacket 8 is provided with lateral bearing pins 10 which are penetrated by the ends of the spindle 9 and which engage in radial bearings, which are arranged fixed to the housing and are designed as pivot bearings and are not shown in FIG. 2.
  • the drive can take place via a drive element 11 placed on one of the bearing journals.
  • the spindle 9 is supported on the jacket 8 by two spacing between the spindle 9 and jacket 8, also designed as a pivot bearing 12.
  • the support bearings 12 are arranged symmetrically to the middle of the jacket and distributed over the length of the jacket so that their distance corresponds to about a third of the jacket length.
  • the jacket 8 can be bent over the spindle 9 be that there is an equally wide gap over the entire length of the roller.
  • the actuators 14 are suitably lockable so that the set deflection is retained. In simple cases with predetermined bending conditions, it may also be sufficient to simply position the casing 8 on the spindle 9 rotatably via the support bearings 12 and to dispense with lateral casing support.
  • the annular space between jacket 8 and spindle 9 can simply be provided with an oil filling which partially occupies it.
  • the inking unit on which FIG. 1 is based is to be used as an offset inking unit, to which, as can further be seen in FIG. 1, a dampening unit 16 is assigned.
  • This dampening unit 16 works here with the applicator roller 4, i.e. the dampening solution application roller rolls on the ink application roller 4.
  • the dampening solution is applied behind the point of contact between the front steel roller 3 and the application roller 4, i.e. the dampening unit 16 is arranged downstream of the touch point mentioned in the direction of rotation of the application roller 4.
  • the particularly preferred embodiment on which the drawing is based can be modified according to the circumstances of the individual case.
  • the front steel roller 2, which delimits the ink reservoir 6, to be directly connected to the Application roller 4 to cooperate, provided that the nip between the roller 2 and the roller 3 can be dispensed with.
  • one or more further steel rollers can be simply arranged between the steel rollers 2 and 3, the diameter of which suitably corresponds to the diameter of the other steel rollers and the circumferential speed of which is different, in such a way that smaller ones become smaller with decreasing distance from the printing form There are peripheral speeds.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Coating Apparatus (AREA)
EP82103607A 1981-05-19 1982-04-28 Dispositif d'encrage court pour une machine à imprimer Expired EP0065138B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3119789 1981-05-19
DE3119789A DE3119789C2 (de) 1981-05-19 1981-05-19 Kurzfarbwerk

Publications (2)

Publication Number Publication Date
EP0065138A1 true EP0065138A1 (fr) 1982-11-24
EP0065138B1 EP0065138B1 (fr) 1985-08-07

Family

ID=6132633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103607A Expired EP0065138B1 (fr) 1981-05-19 1982-04-28 Dispositif d'encrage court pour une machine à imprimer

Country Status (2)

Country Link
EP (1) EP0065138B1 (fr)
DE (2) DE3119789C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550490A1 (fr) * 1983-08-13 1985-02-15 Heidelberger Druckmasch Ag Groupe imprimant a dispositif d'encrage court

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302872A1 (de) * 1983-01-28 1984-10-11 Albert-Frankenthal Ag, 6710 Frankenthal Kurzfarbwerk
DE3401886A1 (de) * 1984-01-20 1985-08-01 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren und vorrichtung zur einfaerbung der platte eines plattenzylinders von rotationsdruckmaschinen
DE102007032979A1 (de) * 2007-07-16 2009-01-22 Heidelberger Druckmaschinen Ag Druckmaschinenwalze

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498440A (en) * 1938-02-21 1939-01-09 Akerlund & Rausing Ab Improvements in or relating to inking devices for printing machines
FR86877E (fr) * 1964-11-26 1966-04-29 Etudes De Machines Speciales Procédé et dispositif d'encrage pour machines d'impression à l'encre grasse
US3587463A (en) * 1970-05-18 1971-06-28 Wallace H Granger Simplified circulating inking system for rotary newspaper printing press
DE3021205A1 (de) * 1979-06-05 1980-12-11 Mitsubishi Heavy Ind Ltd Anilindruckerpresse
EP0023251A1 (fr) * 1979-07-26 1981-02-04 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif d'alimentation en encre pour un systéme d'encrage à rouleaux dans les machines d'impression rotatives
EP0028421A1 (fr) * 1979-11-05 1981-05-13 Dahlgren Manufacturing Company Dispositif encreur pour une machine à imprimer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE553919C (de) * 1932-07-02 Alfred Schlesinger Einfaerbevorrichtung fuer Druckmaschinen
US1993284A (en) * 1934-04-21 1935-03-05 William A Roehm Inking device
GB1059753A (en) * 1964-06-30 1967-02-22 Hans Henry Hartwig Apparatus and method for flexographic printing
CA1019637A (en) * 1972-05-09 1977-10-25 Dahlgren Manufacturing Company Method and apparatus for inking printing plates
AU2424177A (en) * 1976-04-24 1978-10-19 Timsons Ltd Liquid transfer devices
DE2916212A1 (de) * 1979-04-21 1980-10-23 Maschf Augsburg Nuernberg Ag Farbwerk fuer eine druckmaschine
DE7914007U1 (de) * 1979-05-15 1979-08-16 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg Vorrichtung zum durchbiegen einer druckwalze in rotationsdruckmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498440A (en) * 1938-02-21 1939-01-09 Akerlund & Rausing Ab Improvements in or relating to inking devices for printing machines
FR86877E (fr) * 1964-11-26 1966-04-29 Etudes De Machines Speciales Procédé et dispositif d'encrage pour machines d'impression à l'encre grasse
US3587463A (en) * 1970-05-18 1971-06-28 Wallace H Granger Simplified circulating inking system for rotary newspaper printing press
DE3021205A1 (de) * 1979-06-05 1980-12-11 Mitsubishi Heavy Ind Ltd Anilindruckerpresse
EP0023251A1 (fr) * 1979-07-26 1981-02-04 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif d'alimentation en encre pour un systéme d'encrage à rouleaux dans les machines d'impression rotatives
EP0028421A1 (fr) * 1979-11-05 1981-05-13 Dahlgren Manufacturing Company Dispositif encreur pour une machine à imprimer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550490A1 (fr) * 1983-08-13 1985-02-15 Heidelberger Druckmasch Ag Groupe imprimant a dispositif d'encrage court

Also Published As

Publication number Publication date
DE3119789C2 (de) 1984-05-30
DE3119789A1 (de) 1982-12-09
EP0065138B1 (fr) 1985-08-07
DE3265200D1 (en) 1985-09-12

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