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EP0046981B1 - Encrage pour une machine à imprimer - Google Patents

Encrage pour une machine à imprimer Download PDF

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Publication number
EP0046981B1
EP0046981B1 EP81106633A EP81106633A EP0046981B1 EP 0046981 B1 EP0046981 B1 EP 0046981B1 EP 81106633 A EP81106633 A EP 81106633A EP 81106633 A EP81106633 A EP 81106633A EP 0046981 B1 EP0046981 B1 EP 0046981B1
Authority
EP
European Patent Office
Prior art keywords
inking
roller
inkwell
ink
inking roller
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
EP81106633A
Other languages
German (de)
English (en)
Other versions
EP0046981A1 (fr
Inventor
Hans Jörg Dipl.-Ing. Laubscher
Manfred Schwaab
Helmut Puschnerat
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
Priority to AT81106633T priority Critical patent/ATE16987T1/de
Publication of EP0046981A1 publication Critical patent/EP0046981A1/fr
Application granted granted Critical
Publication of EP0046981B1 publication Critical patent/EP0046981B1/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
    • B41F31/26—Construction of inking rollers
    • 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
    • B41F31/06—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders

Definitions

  • the invention relates to an inking unit for a printing press with an ink fountain in which a driven, large, upper inking roller cooperating with a duct roller and a rolling, smaller, lower inking roller provided with a peripheral profile are arranged.
  • An inking unit of this type is known from GB-A 581 348.
  • the smaller, lower inking roller is intended to mix and homogenize the ink fountain contents and improve the adhesion of the ink to the larger, upper inking roller, which here interacts like a duct roller with an ink knife, so that here practically two ducting rollers are arranged one behind the other.
  • the smaller inking roller is provided with circumferential parallel or thread-like grooves, which are separated from one another by webs.
  • the ink filling of the ink fountain should always cover the smaller ink roller with paint.
  • the larger inking roller is arranged next to the smaller inking roller in such a way that its lower area, like the smaller inking roller, dips into the ink filling.
  • the profile of the smaller inking roller with circumferential grooves creates an ink application in the form of circumferential strips on the larger inking roller, which is to be evened out with the aid of the knife assigned to the larger inking roller.
  • the circumferential color stripes build up a significantly higher hydrodynamic pressure below the knife edge than is possible in the intermediate areas, which carry little or no ink. The consequence of this is insufficient color uniformity over the entire length of the roller, especially when not working with a large excess of color, so that pre-metering is practically impossible.
  • the ink rollers of the ink fountain are arranged one above the other in such a way that the lower ink roller is formed by an ink fountain boundary wall formed by the lower ink fountain region and inclined in a V-shape relative to one another, of which the rear ink fountain boundary wall assigned to the filling side is opposite the vertical is inclined more than the front ink fountain boundary wall opposite the filling side, connecting collecting channel is encompassed, the direction of rotation of the lower ink roller in its lower area, which dips into the collecting channel, runs from front to back towards the filling side of the ink fountain, and that the lower ink roller with a provided by toothing-like relief formed in the longitudinal direction of the roll and the interstices formed between them and, like the upper one, on the duct roller a, which cooperates with a stripping device adjustable ink roller is provided with a rubber surface.
  • the relief formed by the lugs extending in the longitudinal direction of the roller advantageously results in a scooping effect, so that even with a very small amount of ink in the ink fountain, which inevitably converges in the collecting channel, sufficient ink removal is still possible.
  • the scoop relief of the lower inking roller according to the invention produces, on the circumference of the upper inking roller in the longitudinal direction of the roller, running color strips which alternate with squeezed zones and which have a well-definable color represent quantity.
  • the measures according to the invention accordingly practically result in an ink pump which, depending on the speed and the cross-section of the relief, conveys ink, which advantageously enables simple dosing of the ink until almost the complete ink fountain filling is used up.
  • the measures according to the invention result in a defined return transport of the unused ink into the rear ink fountain area, which is accessible from the operating side. In addition, any side transport of color is avoided. Nevertheless, the measures according to the invention enable the use of a large-volume color box, so that comparatively long filling intervals result in an advantageous manner.
  • the fact that both inking rollers of the ink fountain are provided with a rubber surface ensures excellent ink acceptance and, in the event that only one roller is driven, roller entrainment is ensured and ensures that the toothed profile of the lower inking roller can be easily pressed into the upper inking roller.
  • the upper inking roller comes into contact with the hard duct roller with its soft surface, it is ensured at the same time that the accuracy of the adjustment process to be accomplished by inserting the inking box is kept within reasonable limits.
  • DD-A 35642 shows a device for transferring the ink from the duct roller, which interacts with an ink knife, into the inking unit.
  • a transfer roller arranged downstream of the duct roller is provided, which is provided with peeling cams provided on the circumference.
  • This transfer roller is placed on the duct roller except for a small gap and peels off an ink film with its peeling cams.
  • the peeled paint is in the form of small paint walls in front of the peeling nooks and is rolled and taken over by the first inking unit roller.
  • This known arrangement does indeed allow dosing of the ink removed from the duct roller. However, this dosage depends exclusively on how thick the peeled ink film is, i.e. H. which gap width is set. A pre-metering of the ink to be fed to the doctor roller is not provided here.
  • both inking rollers are provided with a tooth-like relief that is in mutual engagement, there is advantageously an automatic forced entrainment, the amount of ink conveyed being able to be influenced by changing the mutual engagement depth.
  • the length of the inking rollers can expediently correspond to the clear width of the ink fountain in its area, so that the inking rollers can practically not be traversed by ink passing in the area of the end faces of the inking rollers.
  • the inking rollers can be sealed in the area of their end faces with respect to the adjacent inking box side wall.
  • the ink fountain designated as a whole in FIG. 1 is arranged below a duct roller 2, which interacts with a doctor blade 3.
  • the ink fountain 1 is placed on a carrier 4, which can be pushed into the operating position shown in the direction of arrow 5 via rails of the machine frame (not shown here).
  • the operating position is defined by stops, not shown here, which terminate the insertion movement.
  • two ink rollers 6 and 7 arranged one above the other and rolling on one another are arranged.
  • the upper inking roller 6 lies against the duct roller 2, with a contact pressure defined by the stops assigned to the ink fountain 1.
  • the lateral end of the ink fountain 1 is formed by side walls 8, which are connected by perpendicular to it, front and rear boundary walls 9 and 10 in the direction of insertion, which are inclined in a V-shape and merge into one another in their lower region.
  • the V-shaped inclined boundary walls 9 and 10 at the same time, form drainage edges that drop relatively steeply towards the collecting trough 11, so that the paint in the ink fountain automatically converges in the region of the collecting trough 11.
  • the limits are Tongue walls 9 and 10 to form the collecting channel 11 simply connected to each other by a bow around the lower inking roller 7.
  • the funnel-shaped cross-sectional shape of the ink fountain 1 with draining edges falling steeply towards the collecting trough 11 ensures that the paint automatically gets into the collecting trough 11, even if the colors are relatively tough. Pushing by hand is therefore not necessary, which makes operation extremely easy.
  • the ink is squeezed off at the circumferential regions of the upper inking roller 6 which cooperate with the studs 12.
  • strips of the type indicated at 14 are printed on them, the ink filling of the spaces 13 delimited by the studs 12 being approximately divided.
  • the amount of ink that can be picked up by the spaces 13 is easy to define, so that the amount of ink delivered to the upper inking roller 6 can therefore also be easily determined. This practically depends on the cross section of the spaces 13 and the number of revolutions and can be varied by changing these sizes.
  • the two interacting inking rollers 6 and 7 accordingly practically result in an inking pump, by means of which a well-metered amount of ink can be applied to the duct roller 2.
  • the hydrodynamic pressure building up under the knife tip of the doctor blade 2 interacting with the doctor roller 2 is therefore advantageously easy to control.
  • the direction of rotation of the lower inking roller 7 is selected such that in the lower region, which dips into the sump received by the collecting trough 11, there is a rotation from the front to the rear in accordance with the arrow 15, counter to the direction of insertion. Accordingly, the upper inking roller 6 rolling on the lower inking roller 7 rotates in such a way that, following the contact area between the two inking rollers, there is an upward movement of the direction along the front boundary wall 9 opposite the filling opening to the inking roller 2.
  • the length of the inking rollers corresponds to the clear box width in this area, so that in the area of the end faces of the inking rollers likewise no ink can get from the rear to the front inkbox area.
  • the end faces of the inking rollers 6 and 7 can advantageously be sealed with respect to the adjacent box wall by sealing lips or sealing rings or the like, which are not shown in the drawing.
  • the upper inking roller 6 is, in the exemplary embodiment shown, as shown in FIG. 2, tubular and is rotatably mounted on bearing parts 16 which protrude into the tube cavity via its open end faces and which are fastened to the adjacent side walls 8 of the ink fountain 1.
  • the inking roller 6 is provided with bearing journals 18 fastened to web walls 17 set back from their open end faces, which engage in the bearing parts 16.
  • the drive wheels 22 and the pinions 23 assigned to them are each because neighboring color boxes are expediently arranged side by side in pairs.
  • a continuous shaft 24 is provided for receiving the pinions 23, which is mounted in the machine frame and can be driven by the drive of the duct roller 3 with a fixed or variable transmission ratio.
  • the lower inking roller 7 is provided with a tooth-like relief.
  • the lower inking roller 7 is therefore dragged along by the driven upper inking roller 6.
  • This is expediently provided with a rubber surface, so that the studs 12 can easily press into it, which has a positive effect on the entrainment of the lower inking roller 7.
  • the soft rubber surface of the upper inking roller 6 enables a relatively large tolerance range when it is placed against the ductor roller 2 provided with a steel surface.
  • the lower inking roller 7 should also be provided with a rubber surface, which advantageously also ensures good ink acceptance.
  • both inking rollers 6 and 7 with an interlocking relief in a manner not shown here, in which case the two inking rollers can expediently be arranged so as to be adjustable relative to one another in order to set the desired depth of engagement.
  • the inking unit according to the invention can advantageously be used within a wide ink viscosity range. Regardless of this, however, it can be assumed that the viscosity of offset printing ink and in particular of newspaper offset printing ink is about five times as high as the viscosity of high-pressure ink.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Dot-Matrix Printers And Others (AREA)

Claims (8)

1. Encrage pour une machine à imprimer, comportant un bac à encre (1) dans lequel sont disposés un grand rouleau encreur supérieur (6), qui est entraîné et qui coopère avec un rouleau essuyeur (2), et un rouleau encreur inférieur (7) plus petit, qui est profilé sur sa périphérie, caractérisé en ce que, dans une machine offset, les rouleaux encreurs (6 et 7) du bac à encre (1) sont superposés de telle manière que le rouleau encreur inférieur (7) est entouré par une cuvette collectrice (11) formée par le fond du bac à encre et constituant la liaison entre des parois (9, 10) du bac à encre qui sont inclinées en V l'une par rapport à l'autre, parmi lesquelles la paroi arrière (10), située du côté du remplissage, est plus fortement inclinée par rapport à la verticale que la paroi avant (9), située du côté opposé au remplissage, le sens de rotation du rouleau encreur inférieur (7) étant tel que la partie inférieure du rouleau, qui pénètre dans ladite cuvette collectrice (11), tourne de l'avant vers l'arrière en direction du côté du remplissage du bac (1), et en ce que le rouleau encreur inférieur (7) comporte un relief dentelé, formé de nervures (12) disposées dans la direction longitudinale du rouleau et d'interstices (13) entre ces nervures, et comporte une surface caoutchoutée, tout comme le rouleau encreur supérieur (6) appliqué contre le rouleau essuyeur (2) coopérant avec un dispositif d'essuyage.
2. Encrage selon la revendication 1, caractérisé en ce que les deux rouleaux encreurs (6, 7) comportent des reliefs dentelés qui s'engrènent l'un dans l'autre.
3. Encrage selon la revendication 2, caractérisé en ce que les deux rouleaux encreurs (6, 7) sont réglables l'un par rapport à l'autre.
4. Encrage selon l'une au moins des revendications précédentes, caractérisé en ce que les deux rouleaux encreurs (6, 7) sont entraînés.
5. Encrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins le grand rouleau encreur (6) a une longueur qui correspond à la largeur du bac à encre (1) dans cette zone, et en ce qu'une étanchéité est disposée entre les rouleaux encreurs (6 et 7) et les parois latérales adjacentes (8) du bac à encre, de préférence devant les faces frontales des rouleaux.
6. Encrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins le rouleau encreur supérieur (6) est tubulaire et est monté de manière rotative sur des pièces de palier (16) qui pénètrent par ses extrémités ouvertes dans sa cavité intérieure, lesdites pièces de palier étant introduites dans des évidements des parois latérales (8) du bac à encre.
7. Encrage selon la revendication 6, caractérisé en ce que le rouleau encreur tubulaire (6) comporte des tourillons (18), qui sont engagés dans les pièces de palier (16) solidaires du bac et sont fixés sur des flasques (17) disposés en retrait par rapport auxdites extrémités ouvertes, au moins l'un de ces tourillons étant muni d'une roue d'entraînement (22) située hors du bac à encre (1).
8. Encrage selon la revendication 7, comportant plusieurs bacs à encre juxtaposés sur la largeur de la machine, caractérisé en ce que des pignons (23) montés sur un arbre traversant (24) sont associés auxdites roues d'entraînement (22), lesquelles sont de préférence juxtaposées par paires.
EP81106633A 1980-09-03 1981-08-26 Encrage pour une machine à imprimer Expired EP0046981B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81106633T ATE16987T1 (de) 1980-09-03 1981-08-26 Farbwerk fuer eine druckmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3033045A DE3033045C2 (de) 1980-09-03 1980-09-03 Farbwerk für eine Druckmaschine
DE3033045 1980-09-03

Publications (2)

Publication Number Publication Date
EP0046981A1 EP0046981A1 (fr) 1982-03-10
EP0046981B1 true EP0046981B1 (fr) 1985-12-18

Family

ID=6110965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106633A Expired EP0046981B1 (fr) 1980-09-03 1981-08-26 Encrage pour une machine à imprimer

Country Status (3)

Country Link
EP (1) EP0046981B1 (fr)
AT (1) ATE16987T1 (fr)
DE (2) DE3033045C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3401886A1 (de) * 1984-01-20 1985-08-01 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Verfahren und vorrichtung zur einfaerbung der platte eines plattenzylinders von rotationsdruckmaschinen
DE4438262C2 (de) * 1994-10-26 1996-09-05 Koenig & Bauer Albert Ag Rakeleinrichtung für ein Kurzfarbwerk einer Rotationsdruckmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB581348A (en) * 1944-01-14 1946-10-09 Goss Printing Press Co Ltd Improvements in or relating to inking mechanism for printing presses

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD35642A (fr) *
DE461309C (de) * 1925-09-25 1928-06-18 Max Schloetter Dr Ing Vorrichtung zum Zufuehren der Farbe bei Druckmaschinen mittels einer die Farbei dem Farbwerk zufuehrenden Pumpe
US1840071A (en) * 1929-02-01 1932-01-05 Kieckhefer Container Company Printing machine
US2090361A (en) * 1935-08-31 1937-08-17 Steinmetz Fritz Printing press
GB605797A (en) * 1946-01-04 1948-07-30 Evans & Son Ltd J Improvements in and relating to inking apparatus for printing presses
AT184191B (de) * 1953-11-18 1955-12-27 Winkler Fallert & Co Maschf Farbwerk für Buchdruck-, Offset- u. dgl. Maschinen
US3062138A (en) * 1959-10-09 1962-11-06 Emory W Worthington Inking mechanism for printing presses
CH400194A (de) * 1962-06-16 1965-10-15 Maschf Augsburg Nuernberg Ag Farbwerk für Rotationsdruckmaschinen
GB1307166A (en) * 1971-07-07 1973-02-14 Pamarco Inc Flexographic printing press
US4186661A (en) * 1978-02-27 1980-02-05 Fmc Corporation Flexographic inking system including a reverse angle doctor blade
DE2909008A1 (de) * 1979-03-08 1980-09-11 Frankenthal Ag Albert Farbwerk fuer eine druckmaschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB581348A (en) * 1944-01-14 1946-10-09 Goss Printing Press Co Ltd Improvements in or relating to inking mechanism for printing presses

Also Published As

Publication number Publication date
DE3033045A1 (de) 1982-04-01
DE3033045C2 (de) 1983-01-05
ATE16987T1 (de) 1986-01-15
DE3173252D1 (en) 1986-01-30
EP0046981A1 (fr) 1982-03-10

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