EP0324139B1 - Doctor blade device - Google Patents

Doctor blade device Download PDF

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Publication number
EP0324139B1
EP0324139B1 EP88121337A EP88121337A EP0324139B1 EP 0324139 B1 EP0324139 B1 EP 0324139B1 EP 88121337 A EP88121337 A EP 88121337A EP 88121337 A EP88121337 A EP 88121337A EP 0324139 B1 EP0324139 B1 EP 0324139B1
Authority
EP
European Patent Office
Prior art keywords
doctor blade
doctor
blades
blade device
receiving slot
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
EP88121337A
Other languages
German (de)
French (fr)
Other versions
EP0324139A2 (en
EP0324139A3 (en
Inventor
Norbert Köbler
Norbert Weisbrod
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 EP0324139A2 publication Critical patent/EP0324139A2/en
Publication of EP0324139A3 publication Critical patent/EP0324139A3/en
Application granted granted Critical
Publication of EP0324139B1 publication Critical patent/EP0324139B1/en
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
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the invention relates to a doctor device with at least one doctor blade that can be received on a doctor holder.
  • doctor blade can be inserted loosely into an associated insertion slot of the doctor holder.
  • the inside width of the insertion slot which is preferably continuous over the entire length of the doctor blade holder, can have an excess of about 3 / 100mm to 4 / 100mm compared to the thickness of the associated doctor blade. This measure results in a reliable doctor blade support despite the desired degree of freedom of expansion.
  • the insertion slot can advantageously be delimited by a bar that can be attached to the doctor holder provided with a step-shaped recess. This measure enables simple production of the insertion slot.
  • a further advantageous measure can be that the sealing jaws are arranged in the longitudinal direction of the doctor blades, preferably resiliently pressed against the doctor blades. This ensures that in the event of expansion of the doctor blades, the sealing jaws can deflect, which also prevents ripple of the doctor blades in this case.
  • the short inking unit on which FIG. 1 is based consists of a rubberized applicator roller 2 which interacts with a plate cylinder 1 and is supplied with ink by an anilox roller 3 and with dampening solution 4 by a dampening unit 4.
  • the circumference of the anilox roller 3, which can have a ceramic cover, is provided with cups 5 indicated in an enlarged manner and webs 6 delimiting them.
  • the cells 5 are filled with paint.
  • the webs 6 are scraped off.
  • this includes a bar-shaped doctor holder 9 which is received on supports 8 fixed to the frame and on which two doctor blades 11, 12 which are offset with respect to one another in the direction of rotation of the anilox roller are received.
  • the doctor blade 11, which is at the rear in the direction of rotation of the anilox roller 3, acts as a doctor blade, which is covered by a discharge channel 14.
  • the other doctor blade 12 acts as a closing doctor.
  • both doctor blades are arranged with a negative angle of attack.
  • This is provided with squeegee blades 11, 12, each of which has insertion slots 15 that are continuous over its entire length.
  • the squeegee holder 9 is in the region of its flanks, each with a step-shaped Provide recess, which is closed by a bar 10 attached to the doctor holder 9 so that the groove-shaped insertion slot 15 results.
  • the clear width of the insertion slots 15 has an excess of about 3 / 100mm to 4 / 100mm compared to the thickness of the doctor blade assigned in each case.
  • the doctor blades 11, 12 also extend over the entire length of the doctor holder 9.
  • the ink-receiving chamber 13 is delimited by sealing jaws 43 resting on the circumference of the anilox roller 3 and on the end faces of the doctor blades 11, 12.
  • These are formed by their side edges in corresponding, 46 provided on the doctor holder 9 guides 46 insertable plates.
  • the clear width of the guides 46 has so much excess in the longitudinal direction of the doctor blades 11, 12 compared to the thickness of the sealing jaws 43 that a corresponding evasion of the sealing jaws 43 is possible in the event of an expansion of the doctor blades 11, 12. These are pressed resiliently onto the end faces of the doctor blades 11, 12.
  • the sealing jaws 43 are gripped in the area of their abutment on the doctor blade end faces by finger-shaped abutments 44, which are resiliently supported in the longitudinal direction of the doctor blades 11, 12 on the doctor holder 9, as indicated at 45.

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

Description

Die Erfindung betrifft eine Rakeleinrichtung mit wenigstens einem Rakelblatt, das auf einem Rakelhalter aufnehmbar ist.The invention relates to a doctor device with at least one doctor blade that can be received on a doctor holder.

Bei den bekannten Anordnungen dieser Art, wie aus US-A-4 590 855 zu ersehen, wird das Rakelblatt fest eingespannt. Die Folge einer derartigen Einspannung ist, daß sich der eingespannte Bereich des Rakelblatts, das sich im Betrieb nicht unerheblich erwärmt, nicht seitlich ausdehnen kann. Es kommt daher zu einer Welligkeit des nicht eingespannten, am abzurakelnden Zylinder anliegenden Bereichs des Rakelblatts. Um dennoch eine unexakte Anlage des Rakelblatts am abzurakelnden Zylinder zu vermeiden, ist es dabei erforderlich, das Rakelblatt mit hoher Kraft anzustellen. Dies führt aber zu einem schnellen Verschleiß des Rakelblatts, so daß eine häufige Nachstellung und ein häufiger Rakelblattwechsel erforderlich werden. Die bekannten Anordnungen erweisen sich demnach als nicht bedienungsfreundlich und wirtschaftlich genug. Die obigen Nachteile treten bei der Verarbeitung von Offsetfarben besonders stark zutage, da hierbei infolge der hohen Farbviskosität eine sehr starke Erwärmung des Rakelblatts zu erwarten ist.In the known arrangements of this type, as can be seen from US-A-4 590 855, the doctor blade is firmly clamped. The consequence of such clamping is that the clamped area of the doctor blade, which heats up not inconsiderably during operation, cannot expand laterally. There is therefore a ripple in the area of the doctor blade that is not clamped and is in contact with the cylinder to be scraped off. However, in order to avoid inaccurate contact of the doctor blade with the cylinder to be doctored, it is necessary to apply the doctor blade with high force. However, this leads to rapid wear of the doctor blade, so that frequent readjustment and a frequent doctor blade change are necessary. The known arrangements therefore prove to be not user-friendly and economical enough. The above disadvantages are particularly evident when processing offset inks, because of the high Ink viscosity a very strong heating of the doctor blade is to be expected.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Rakeleinrichtung eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbessern, daß eine schonende und dennoch zuverlässige Betriebsweise gewährleistet ist.Proceeding from this, it is therefore the object of the present invention to improve a doctor device of the type mentioned at the outset with simple and inexpensive means in such a way that a gentle yet reliable mode of operation is ensured.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Rakelblatt lose in einen zugeordneten Einlegeschlitz des Rakelhalters einlegbar ist.This object is achieved in that the doctor blade can be inserted loosely into an associated insertion slot of the doctor holder.

Hierdurch wird erreicht, daß sich das Rakelblatt bzw. die Rakelblätter im Falle einer Erwärmung seitlich ausdehnen kann bzw. können, so daß auch bei geringer Anstellkraft und damit schonender Betriebsweise eine zuverlässige Anlage des Rakelblatts bzw. der Rakelblätter am abzurakelnden Zylinder erreicht wird. Dies ist besonders dort von Vorteil, wo hochviskose Farben, wie Offsetfarben, verarbeitet werden, die zu einer starken Erwärmung des Rakelblatts bzw. der Rakelblätter führen kann.This ensures that the doctor blade or the doctor blades can expand laterally in the event of heating, so that a reliable contact of the doctor blade or the doctor blades on the cylinder to be doctored is achieved even with low contact force and therefore gentle operation. This is particularly advantageous where highly viscous inks, such as offset inks, are processed, which can lead to excessive heating of the doctor blade or the doctor blades.

Zweckmäßig kann dabei die lichte Weite des vorzugsweise über die ganze Länge des Rakelhalters durchgehenden Einlegeschlitzes gegenüber der Dicke des zugeordneten Rakelblatts ein Übermaß von etwa 3/100mm bis 4/100mm aufweisen. Diese Maßnahme ergibt trotz des erwünschten Ausdehnungsfreiheitsgrads eine zuverlässige Rakelblattabstützung.Appropriately, the inside width of the insertion slot, which is preferably continuous over the entire length of the doctor blade holder, can have an excess of about 3 / 100mm to 4 / 100mm compared to the thickness of the associated doctor blade. This measure results in a reliable doctor blade support despite the desired degree of freedom of expansion.

Vorteilhaft kann der Einlegeschlitz durch eine an den mit einer stufenförmigen Ausnehmung versehenen Rakelhalter ansetzbare Leiste begrenzt sein. Diese Maßnahme ermöglicht eine einfache Herstellung des Einlegeschlitzes.The insertion slot can advantageously be delimited by a bar that can be attached to the doctor holder provided with a step-shaped recess. This measure enables simple production of the insertion slot.

Bei einer Kammerrakel mit einem durch zwei Rakelblätter und an deren Stirnseiten anliegenden Dichtbacken begrenzten Farbaufnahmeraum kann eine weitere vorteilhafte Maßnahme darin bestehen, daß die Dichtbacken in Längsrichtung der Rakelblätter nachgiebig angeordnet, vorzugsweise federnd an die Rakelblätter andrückbar sein können. Hierdurch ist sichergestellt, daß im Falle einer Ausdehnung der Rakelblätter die Dichtbacken ausweichen können, wodurch auch in diesem Falle eine Welligkeit der Rakelblätter verhindert wird.In the case of a chambered doctor blade with an ink-receiving space delimited by two doctor blades and sealing jaws resting on their end faces, a further advantageous measure can be that the sealing jaws are arranged in the longitudinal direction of the doctor blades, preferably resiliently pressed against the doctor blades. This ensures that in the event of expansion of the doctor blades, the sealing jaws can deflect, which also prevents ripple of the doctor blades in this case.

Weitere zweckmäßige Fortbildungen und vorteilhafte Ausgestaltungen der übergeordneten Maßnahmen sind in den restlichen Unteransprüchen angegeben.Further expedient further training and advantageous refinements of the superordinate measures are specified in the remaining subclaims.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the drawing.

In der Zeichnung zeigen:

Figur 1
eine schematische Darstellung eines Offset-Kurzfarbwerks und
Figur 2
einen Schnitt durch eine Kammerrakel mit zwei lose angeordneten Rakelblättern.
The drawing shows:
Figure 1
a schematic representation of an offset short inking unit and
Figure 2
a section through a doctor blade with two loosely arranged doctor blades.

Das der Figur 1 zugrundeliegende Kurzfarbwerk besteht aus einer mit einem Plattenzylinder 1 zusammenwirkenden, gummierten Auftragwalze 2, die durch eine Rasterwalze 3 mit Farbe und durch ein Feuchtwerk 4 mit Feuchtmittel versorgt wird. Der Umfang der Rasterwalze 3, die einen Keramikbezug aufweisen kann, ist mit vergrößert angedeuteten Näpfchen 5 und diese begrenzenden Stegen 6 versehen. Die Näpfchen 5 werden mit Farbe gefüllt. Die Stege 6 werden abgerakelt.The short inking unit on which FIG. 1 is based consists of a rubberized applicator roller 2 which interacts with a plate cylinder 1 and is supplied with ink by an anilox roller 3 and with dampening solution 4 by a dampening unit 4. The circumference of the anilox roller 3, which can have a ceramic cover, is provided with cups 5 indicated in an enlarged manner and webs 6 delimiting them. The cells 5 are filled with paint. The webs 6 are scraped off.

Die Farbzufuhr zur Rasterwalze 3 und die Abrakelung der Stege 6 erfolgen mittels einer in Figur 1 als Ganzes mit 7 bezeichneten Kammerrakel. Diese umfaßt, wie Figur 2 zeigt, einen auf gestellfesten Trägern 8 aufgenommenen, balkenförmigen Rakelhalter 9, auf dem zwei in Drehrichtung der Rasterwalze gegeneinander versetzte Rakelblätter 11, 12 aufgenommen sind. Diese begrenzen eine Farbaufnahmekammer 13 (Farbkammer), die mittels einer Pumpe 16 mit Offsetfarbe versorgt wird. Das in Drehrichtung der Rasterwalze 3 hintere Rakelblatt 11 wirkt als Vorrakel, das von einer Ableitrinne 14 unterfaßt ist. Das andere Rakelblatt 12 wirkt als Schließrakel. Beide Rakelblätter sind im dargestellten Ausführungsbeispiel mit negativem Anstellwinkel angeordnet.The ink supply to the anilox roller 3 and the scraping of the webs 6 take place by means of a chamber doctor blade designated as a whole in FIG. 1. As shown in FIG. 2, this includes a bar-shaped doctor holder 9 which is received on supports 8 fixed to the frame and on which two doctor blades 11, 12 which are offset with respect to one another in the direction of rotation of the anilox roller are received. These limit an ink receiving chamber 13 (ink chamber) which is supplied with offset ink by means of a pump 16. The doctor blade 11, which is at the rear in the direction of rotation of the anilox roller 3, acts as a doctor blade, which is covered by a discharge channel 14. The other doctor blade 12 acts as a closing doctor. In the exemplary embodiment shown, both doctor blades are arranged with a negative angle of attack.

Die Rakelblätter 11, 12, die infolge der hohen Viskosität von Offsetfarbe einer hohen Erwärmung unterliegen, sind lose, d. h. ohne Klemmung, auf dem Rakelhalter 9 aufgenommen. Dieser ist mit den Rakelblättern 11, 12 jeweils zugeordneten, über seine ganze Länge durchgehenden Einlegeschlitzen 15 versehen. Hierzu ist der Rakelhalter 9 im Bereich seiner Flanken mit jeweils einer stufenförmigen Ausnehmung versehen, die jeweils durch eine an den Rakelhalter 9 angesetzte Leiste 10 so geschlossen wird, daß sich der nutförmige Einlegeschlitz 15 ergibt. Die lichte Weite der Einlegeschlitze 15 besitzt gegenüber der Dicke des jeweils zugeordneten Rakelblatts ein Übermaß von etwa 3/100mm bis 4/100mm.The doctor blades 11, 12, which are subject to high heating due to the high viscosity of offset ink, are received loosely, ie without clamping, on the doctor holder 9. This is provided with squeegee blades 11, 12, each of which has insertion slots 15 that are continuous over its entire length. For this purpose, the squeegee holder 9 is in the region of its flanks, each with a step-shaped Provide recess, which is closed by a bar 10 attached to the doctor holder 9 so that the groove-shaped insertion slot 15 results. The clear width of the insertion slots 15 has an excess of about 3 / 100mm to 4 / 100mm compared to the thickness of the doctor blade assigned in each case.

Die Rakelblätter 11, 12 erstrecken sich ebenfalls über die ganze Länge des Rakelhalters 9. Im Bereich der Stirnseiten des Rakelhalters 9 wird die Farbaufnahmekammer 13 durch am Umfang der Rasterwalze 3 und an den Stirnseiten der Rakelblätter 11, 12 anliegende Dichtbacken 43 begrenzt. Diese werden durch mit ihren Seitenkanten in entsprechende, am Rakelhalter 9 vorgesehene Führungen 46 einsteckbare Bleche gebildet. Die lichte Weite der Führungen 46 besitzt gegenüber der Dicke der Dichtbacken 43 so viel Übermaß in Längsrichtung der Rakelblätter 11, 12, daß im Falle einer Ausdehnung der Rakelblätter 11, 12 ein entsprechendes Ausweichen der Dichtbacken 43 möglich ist. Diese werden federnd an die Stirnseiten der Rakelblätter 11, 12 angedrückt. Hierzu werden die Dichtbacken 43 im Bereich ihrer Anlage an den Rakelblattstirnseiten von fingerförmigen Widerlagern 44 hinterfaßt, die in Längsrichtung der Rakelblätter 11, 12 federnd am Rakelhalter 9 abgestützt sind, wie bei 45 angedeutet ist.The doctor blades 11, 12 also extend over the entire length of the doctor holder 9. In the area of the end faces of the doctor holder 9, the ink-receiving chamber 13 is delimited by sealing jaws 43 resting on the circumference of the anilox roller 3 and on the end faces of the doctor blades 11, 12. These are formed by their side edges in corresponding, 46 provided on the doctor holder 9 guides 46 insertable plates. The clear width of the guides 46 has so much excess in the longitudinal direction of the doctor blades 11, 12 compared to the thickness of the sealing jaws 43 that a corresponding evasion of the sealing jaws 43 is possible in the event of an expansion of the doctor blades 11, 12. These are pressed resiliently onto the end faces of the doctor blades 11, 12. For this purpose, the sealing jaws 43 are gripped in the area of their abutment on the doctor blade end faces by finger-shaped abutments 44, which are resiliently supported in the longitudinal direction of the doctor blades 11, 12 on the doctor holder 9, as indicated at 45.

Claims (7)

  1. A doctor blade device for a pitted roll (3) of an offset lith printing press inking unit, comprising two doctor blades (11 and 12) delimiting between them an ink chamber (13) and offset in the direction of rotation of the pitted roll, such doctor blades being able to be mounted on a doctor blade holder (9), characterized in that the doctor blade (11), which is to the rear in the direction of rotation of the pitted roll (3) which is to be doctored, is able to be loosely inserted into an associated receiving slot (15) of the doctor blade holder (9) and is arranged with a negative rake angle and in that sealing cheeks (43) are arranged at the ends of the ink chamber (13) for resilient movement in the longitudinal direction of the doctor blade.
  2. The doctor blade device as claimed in claim 1, characterized in that both doctor blades (11 and 12) are adapted to be loosely inserted into a respectively associated receiving slot (15) in the doctor blade holder.
  3. The doctor blade device as claimed in either of the preceding claims, characterized in that both doctor blades (11 and 12) are set with a negative angle of rake.
  4. The doctor blade device as claimed in any one of the preceding claims, characterized in that the sealing cheeks (43) are mounted resiliently on the doctor blades (11 and 12).
  5. The doctor blade device as claimed in any one of the preceding claims, characterized in that the clearance width of the receiving slot (15) has an oversize in relation to the thickness of the associated doctor blade (11 and 12) amounting to preferably 3/100 mm to 4/100 mm.
  6. The doctor blade device as claimed in any one of the preceding claims, characterized in that the receiving slot (15) extends along the complete length of the doctor blade holder (9).
  7. The doctor blade device as claimed in any one of the preceding claims, characterized in that the receiving slot (15) is delimited by a rail (10) adapted to be mounted on the doctor blade holder (9) provided with a stepped recess.
EP88121337A 1988-01-09 1988-12-21 Doctor blade device Expired - Lifetime EP0324139B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3800411 1988-01-09
DE3800411A DE3800411A1 (en) 1988-01-09 1988-01-09 INK

Publications (3)

Publication Number Publication Date
EP0324139A2 EP0324139A2 (en) 1989-07-19
EP0324139A3 EP0324139A3 (en) 1990-08-08
EP0324139B1 true EP0324139B1 (en) 1992-07-08

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP88121337A Expired - Lifetime EP0324139B1 (en) 1988-01-09 1988-12-21 Doctor blade device
EP88121339A Expired - Lifetime EP0324141B1 (en) 1988-01-09 1988-12-21 Inking unit

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88121339A Expired - Lifetime EP0324141B1 (en) 1988-01-09 1988-12-21 Inking unit

Country Status (4)

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US (2) US5010815A (en)
EP (2) EP0324139B1 (en)
JP (2) JPH01222959A (en)
DE (3) DE3800411A1 (en)

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Also Published As

Publication number Publication date
DE3872693D1 (en) 1992-08-13
EP0324139A2 (en) 1989-07-19
US5072669A (en) 1991-12-17
EP0324141A3 (en) 1990-08-22
JPH01222959A (en) 1989-09-06
EP0324141B1 (en) 1992-07-08
DE3800411A1 (en) 1989-07-20
JPH07102687B2 (en) 1995-11-08
JPH01225555A (en) 1989-09-08
DE3872692D1 (en) 1992-08-13
EP0324139A3 (en) 1990-08-08
DE3800411C2 (en) 1990-03-29
EP0324141A2 (en) 1989-07-19
US5010815A (en) 1991-04-30

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