EP0616075B1 - Doctor system - Google Patents

Doctor system Download PDF

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Publication number
EP0616075B1
EP0616075B1 EP94102521A EP94102521A EP0616075B1 EP 0616075 B1 EP0616075 B1 EP 0616075B1 EP 94102521 A EP94102521 A EP 94102521A EP 94102521 A EP94102521 A EP 94102521A EP 0616075 B1 EP0616075 B1 EP 0616075B1
Authority
EP
European Patent Office
Prior art keywords
doctor
bed
clamping
doctor blade
blade
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
EP94102521A
Other languages
German (de)
French (fr)
Other versions
EP0616075A1 (en
Inventor
Richard Bernert
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.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0616075A1 publication Critical patent/EP0616075A1/en
Application granted granted Critical
Publication of EP0616075B1 publication Critical patent/EP0616075B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes

Definitions

  • the invention relates to a doctor system according to the preamble of claim 1.
  • a doctor system is known from GB-A-2.042.937.
  • the doctor blade support blade is generally also a leaf spring.
  • the doctor system known from DE-A-2.008.082 it is possible under certain circumstances because the doctor bed is vulcanized onto the retaining blade and the press hose acts on the doctor bed and thus the doctor rod via the vulcanized-on part of the retaining blade.
  • doctor beds that have formed a retaining strip by means of which it is attached to the retaining blade. This makes it easier to replace the doctor beds without having to throw away the holding blade. With these arrangements, it is almost impossible to replace a doctor bed including a doctor bar and holding blade with a doctor blade without major modifications.
  • the holding blade and the doctor blade should be fixed in the same clamping.
  • the doctor bed 1 is arranged in a lower quadrant of the counter roll W with the doctor rod 2 carried by it. Squeegee bed and squeegee rod are pressed against the counter roller via pressure piece 5 and press hose 3. The pressure piece is guided in a guide 9 essentially horizontally. The press hose is held in an extension 6 of the pressure piece 5.
  • the doctor bed 1 is clamped to the leaf spring-like holding blade 7 by its terminal strip 4, which is designed as an extension. This extension is located at a distance from the back of the doctor bed opposite the doctor rod 2, on which the press hose 3 engages. In the extension of the back of the doctor bed is the holding blade 7, so that both parts are essentially in one plane.
  • the holding blade 7 is clamped in the holder 8 by means of a slide 8 '. If the doctor bed 1 is replaced by a doctor blade 10, this runs exactly in the plane of the holding blade 7, as indicated by the dash-dotted line. A slight swiveling of the squeegee system is sufficient to bring the coating blade against the counter-roller W.
  • the offset of the pressure line of the pressure hose 3 on the doctor bed in relation to the central plane of the pressure piece 5 also provides a suitable pressure line for the doctor blade, whereby no major disadvantages arise due to the offset of the pressure line of the pressure hose on the doctor rod 2.
  • the holding strip 4 is offset in the direction of the clamping 8, 8 'with respect to the doctor bed or attached to this.
  • the clamping bar 4 'of the doctor bed is offset in the opposite direction and is located in the end region of an inclined surface 14 on the front of the doctor bed.
  • the inclination of this surface - or its chord, if it is curved - with respect to the connecting plane between the center line of the doctor rod 2 and the press tube 3 is between 45 and 55 °.
  • the other parts match and have the same reference numerals, possibly with a comma.
  • Doctor blade 10 which is inserted into the clamping 8, 8 ', it extends to the "height" h.
  • the doctor blade system is preferably arranged in an angular range between 20 and 60 ° - measured from the base point of the roller W - in its lower quadrant of its cross section. As you can see, the doctor bed has enough space between the pressure piece and its clamping and the roller W. In the case of the doctor blade, there is of course no need to fear a spatial narrowness - because of the narrowness of the doctor blade.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Cyclones (AREA)
  • Rotary Presses (AREA)

Abstract

A doctor blade holding apparatus, preferably for coating devices, includes a clamping mechanism which holds, via a mounting plate, a doctor blade support which carries a doctor rod. The apparatus includes a pressing tube which presses against the doctor blade support and thus presses the doctor rod against a counter roll. A holding strip provided at a back side of the doctor blade support clamps the mounting plate to the doctor blade support. The holding strip is disposed laterally with respect to a mid-plane of the doctor blade support to provide a contact region between a back side of the doctor blade support and the pressing tube which is in substantially the same plane as the mounting plate.

Description

Die Erfindung betrifft ein Rakelsystem nach dem Oberbegriff des Patentanspruchs 1. Ein solches System ist bekannt aus GB-A-2.042.937. Es besteht die Forderung, ohne größere Umbauten ein Rakelbett samt Rollrakelstab zu ersetzen durch eine Streichklinge, die im allgemeinen als Blattfeder ausgebildet ist. Die Halteklinge des Rakelbetts ist im allgemeinen auch eine Blattfeder. Bei der bekannten Einrichtung ist es sehr schwer möglich, einen Ersatz des Rakelbetts durch die Streichklinge vorzunehmen. Bei dem aus der DE-A-2.008.082 bekannten Rakelsystem ist es allerdings unter Umständen möglich, weil das Rakelbett an der Halteklinge anvulkanisiert ist und der Preßschlauch über den anvulkanisierten Teil der Halteklinge auf das Rakelbett und damit den Rakelstab einwirkt. Heute ist es aber üblich, Rakelbetten zu benutzen, die eine Halteleiste angeformt haben, mittels derer es auf der Halteklinge befestigt ist. Man kann dadurch leichter die Rakelbetten austauschen, ohne auch noch die Halteklinge wegwerfen zu müssen. Bei diesen Anordnungen ist es fast unmöglich, ohne größere Umbauten ein Rakelbett samt Rakelstab und Halteklinge gegen eine Streichklinge auszutauschen. Dabei soll ja die Halteklinge und die Streichklinge in derselben Einspannung festgelegt werden.The invention relates to a doctor system according to the preamble of claim 1. Such a system is known from GB-A-2.042.937. There is a requirement to replace a doctor bed including roller doctor bar without major modifications by a doctor blade, which is generally designed as a leaf spring. The doctor blade support blade is generally also a leaf spring. In the known device, it is very difficult to replace the doctor bed by the doctor blade. In the doctor system known from DE-A-2.008.082, however, it is possible under certain circumstances because the doctor bed is vulcanized onto the retaining blade and the press hose acts on the doctor bed and thus the doctor rod via the vulcanized-on part of the retaining blade. Today, however, it is common to use doctor beds that have formed a retaining strip by means of which it is attached to the retaining blade. This makes it easier to replace the doctor beds without having to throw away the holding blade. With these arrangements, it is almost impossible to replace a doctor bed including a doctor bar and holding blade with a doctor blade without major modifications. The holding blade and the doctor blade should be fixed in the same clamping.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst. Durch die freie Fläche (Druckfläche) der Rückseite des Rakelbetts ist praktisch im allgemeinen nur eine geringe Schwenkbewegung des Rakelsystems nötig, um auch im Fall der anzuwendenden Streichklinge ein Anpressen derselben durch den Preßschlauch ohne Umbauarbeiten vornehmen zu können.The object is achieved by the features of the characterizing part of patent claim 1. Due to the free area (pressure area) of the back of the doctor bed, only a slight swiveling movement of the doctor system is practically necessary in order to be able to press the same through the press hose without any modification work, even in the case of the doctor blade to be used.

Nachfolgend wird die Erfindung anhand der in den Figuren dargestellten Ausführungsbeispielen erläutert, die jeweils die Anordnung in Seitenansicht (nur der Preßschlauch ist geschnitten) zeigen.The invention is explained below with reference to the exemplary embodiments shown in the figures, each of which shows the arrangement in a side view (only the press hose is cut).

In Figur 1 ist das Rakelbett 1 in einem untern Quadranten der Gegenwalze W mit dem von ihm getragenen Rakelstab 2 angeordnet. Rakelbett und Rakelstab werden über Druckstück 5 und Preßschlauch 3 an die Gegenwalze angepreßt. Das Druckstück ist in einer Führung 9 im wesentlichen horizontal geführt. Der Preßschlauch ist in einem Fortsatz 6 des Druckstücks 5 gehalten. Das Rakelbett 1 wird an der blattfederartigen Halteklinge 7 durch seine als Fortsatz ausgebildete Klemmleiste 4 angeklemmt. Dieser Fortsatz befindet sich entfernt von der dem Rakelstab 2 gegenüberliegenden Rückseite des Rakelbetts, an welchem Preßschlauch 3 angreift. In der Verlängerung der Rückseite des Rakelbetts befindet sich also die Halteklinge 7, so daß also beide genannten Teile im wesentlichen in einer Ebene liegen. Die Halteklinge 7 wird in der Halterung 8 mittels Schieber 8' eingeklemmt. Wird das Rakelbett 1 durch eine Streichklinge 10 ersetzt, verläuft diese genau in der Ebene der Halteklinge 7, wie durch die strichpunktierte Linie angedeutet ist. Es genügt eine geringe Verschwenkung des Rakelsystems, um die Streichklinge dann an der Gegenwalze W zum Anliegen zu bringen. Durch den Versatz der Andrücklinie des Preßschlauchs 3 am Rakelbett in Bezug auf die Mittelebene des Druckstücks 5 erzielt man eine geeignete Anpreßlinie auch für die Streichklinge, wobei durch den Versatz der Anpreßlinie des Druckschlauchs auf den Rakelstab 2 keine größeren Nachteile entstehen. Hierbei ist die Halteleiste 4 in Richtung auf die Einspannung 8, 8' in Bezug auf das Rakelbett versetzt bzw. an diesem angebracht.In Figure 1, the doctor bed 1 is arranged in a lower quadrant of the counter roll W with the doctor rod 2 carried by it. Squeegee bed and squeegee rod are pressed against the counter roller via pressure piece 5 and press hose 3. The pressure piece is guided in a guide 9 essentially horizontally. The press hose is held in an extension 6 of the pressure piece 5. The doctor bed 1 is clamped to the leaf spring-like holding blade 7 by its terminal strip 4, which is designed as an extension. This extension is located at a distance from the back of the doctor bed opposite the doctor rod 2, on which the press hose 3 engages. In the extension of the back of the doctor bed is the holding blade 7, so that both parts are essentially in one plane. The holding blade 7 is clamped in the holder 8 by means of a slide 8 '. If the doctor bed 1 is replaced by a doctor blade 10, this runs exactly in the plane of the holding blade 7, as indicated by the dash-dotted line. A slight swiveling of the squeegee system is sufficient to bring the coating blade against the counter-roller W. The offset of the pressure line of the pressure hose 3 on the doctor bed in relation to the central plane of the pressure piece 5 also provides a suitable pressure line for the doctor blade, whereby no major disadvantages arise due to the offset of the pressure line of the pressure hose on the doctor rod 2. Here, the holding strip 4 is offset in the direction of the clamping 8, 8 'with respect to the doctor bed or attached to this.

In Figur 2 ist die Klemmleiste 4' des Rakelbetts in entgegengesetzter Richtung versetzt und befindet sich im Endbereich einer geneigten Fläche 14 auf der Vorderseite des Rakelbetts. Die Neigung dieser Fläche - bzw. ihrer Sehne, wenn diese gewölbt ausgebildet ist - in Bezug auf die Verbindungsebene zwischen der Mittellinie des Rakelstabs 2 und des Preßschlauchs 3 beträgt zwischen 45 und 55°. Die übrigen Teile stimmen überein und weisen die gleichen Bezugszeichen, evtl. mit einem Beistrich versehen, auf. Im Fall der Streichklinge 10, die in die Einspannung 8, 8' eingesetzt ist, reicht sie bis zur "Höhe" h.In Figure 2, the clamping bar 4 'of the doctor bed is offset in the opposite direction and is located in the end region of an inclined surface 14 on the front of the doctor bed. The inclination of this surface - or its chord, if it is curved - with respect to the connecting plane between the center line of the doctor rod 2 and the press tube 3 is between 45 and 55 °. The other parts match and have the same reference numerals, possibly with a comma. In the case of Doctor blade 10, which is inserted into the clamping 8, 8 ', it extends to the "height" h.

In beiden Fällen ist das Rakelsystem vorzugsweise in einem Winkelbereich zwischen 20 und 60° - gemessen vom Fußpunkt der Walze W aus - also in deren unteren Quadranten ihres Querschnitts angeordnet. Wie man sieht, hat dadurch das Rakelbett genügend Platz zwischen dem Druckstück und ihrer Einspannung und der Walze W. Für den Fall der Streichklinge ist natürlich eine räumliche Enge - wegen der Schmalheit der Streichklinge - ohnehin nicht zu befürchten.In both cases, the doctor blade system is preferably arranged in an angular range between 20 and 60 ° - measured from the base point of the roller W - in its lower quadrant of its cross section. As you can see, the doctor bed has enough space between the pressure piece and its clamping and the roller W. In the case of the doctor blade, there is of course no need to fear a spatial narrowness - because of the narrowness of the doctor blade.

Claims (4)

  1. Doctor system, preferably for spreading devices, comprising a clamping device (8, 8') which supports via a holding blade (7, 7') a doctor bed (1, 1') which carries a doctor bar (2), and a pressure hose which presses the doctor bed and thus the doctor bar against a counter-roller (W), and a clamping ledge (4, 4') provided at the rear of the doctor bed (1, 1') which serves to hold the doctor bed on the holding blade (4, 4'), characterised in that the clamping ledge (4, 4') is fitted offset from a centre area of the rear of the doctor bed so that an engagement surface remains as a pressure surface for the pressure hose (3) at this side which is positioned essentially in a plane extending through the holding blade (7, 7'), and that the clamping ledge (4, 4') is designed as a continuation of the doctor bed (1, 1').
  2. Doctor system according to Claim 1, characterised in that an end surface (14) of the doctor bed (1') is provided which extends transversely away from the doctor bar (2) and in the direction away from the clamping device of the holding blade (8, 8'), which is arranged at an angle between 45° and 55° to the connecting plane between the centre axis of the doctor bar (2) and the press-on line of the pressure hose (3), and that the clamping ledge (4') is located in this area of the doctor bed (1') remote from the clamping device of the holding blade (8').
  3. Doctor system according to Claim 1, characterised in that the clamping ledge (4) is closer to the clamping device of the holding blade (8) than to the bed (2) and protrudes beyond the doctor bed (2) in the direction of the clamping device.
  4. Doctor system according to one of Claims 1 - 3, characterised in that it is arranged at an angular range between 20° and 60° as measured from the base point of the roller (W), in its lower quadrant.
EP94102521A 1993-03-16 1994-02-19 Doctor system Expired - Lifetime EP0616075B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4308302 1993-03-16
DE4308302A DE4308302A1 (en) 1993-03-16 1993-03-16 Coating scraper assembly - has bed exchange action without discarding holding blades and without dismantling

Publications (2)

Publication Number Publication Date
EP0616075A1 EP0616075A1 (en) 1994-09-21
EP0616075B1 true EP0616075B1 (en) 1997-05-02

Family

ID=6482909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102521A Expired - Lifetime EP0616075B1 (en) 1993-03-16 1994-02-19 Doctor system

Country Status (7)

Country Link
US (1) US5417761A (en)
EP (1) EP0616075B1 (en)
JP (1) JPH06316891A (en)
AT (1) ATE152495T1 (en)
CA (1) CA2119214A1 (en)
DE (2) DE4308302A1 (en)
FI (1) FI107887B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510486U1 (en) * 1995-06-30 1995-08-17 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Squeegee assembly
DE19626580A1 (en) * 1996-07-02 1998-01-08 Jagenberg Papiertech Gmbh Metering rod system for a coater for web products such as paper
CA2374786A1 (en) 1999-05-25 2000-11-30 John Moscone Doctor blade extractor
US6202252B1 (en) 1999-06-03 2001-03-20 Valmet Ltd. Doctoring apparatus
US6697594B1 (en) 2002-09-13 2004-02-24 Lexmark International, Inc. Doctor blade support for an image forming apparatus

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143438A (en) * 1960-07-26 1964-08-04 West Virginia Pulp & Paper Co Apparatus for coating web material
US3559572A (en) * 1969-05-14 1971-02-02 Us Plywood Champ Papers Inc Method of inking a printing roll using a metering roll and revolving doctor rod
DE2008082B2 (en) * 1970-02-21 1973-05-03 Jagenberg-Werke AG, 4000 Düsseldorf DEVICE FOR REGULATING THE APPLICATION THICKNESS WHEN COATING MOVING RAILS OF MATERIAL
DE2851015C2 (en) * 1978-11-24 1982-07-08 Jagenberg-Werke AG, 4000 Düsseldorf Device for regulating the application thickness when coating moving material webs
US4245582A (en) * 1979-02-02 1981-01-20 Beloit Corporation Adjustable rod holder for metering rod coaters
US4452833A (en) * 1982-02-08 1984-06-05 Consolidated Papers, Inc. Paper coating method
DE3311081A1 (en) * 1983-03-26 1984-09-27 J.M. Voith Gmbh, 7920 Heidenheim Squeegee holder
FI73266C (en) * 1984-06-29 1987-09-10 Waertsilae Oy Ab Rod scraper for paper coating device.
FI85897C (en) * 1990-04-19 1992-06-10 Valmet Paper Machinery Inc Procedure for limiting coating width when coating applications or cardboard and device intended for carrying out the process
DE4217528C2 (en) * 1992-05-27 1996-05-30 Voith Gmbh J M Coating device for running webs

Also Published As

Publication number Publication date
CA2119214A1 (en) 1994-09-17
DE4308302A1 (en) 1993-08-05
FI941006A0 (en) 1994-03-02
DE59402581D1 (en) 1997-06-05
FI107887B (en) 2001-10-31
FI941006A (en) 1994-09-17
ATE152495T1 (en) 1997-05-15
US5417761A (en) 1995-05-23
JPH06316891A (en) 1994-11-15
EP0616075A1 (en) 1994-09-21

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