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EP0181431A2 - Method for cutting up work pieces by sawing - Google Patents

Method for cutting up work pieces by sawing Download PDF

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Publication number
EP0181431A2
EP0181431A2 EP85106483A EP85106483A EP0181431A2 EP 0181431 A2 EP0181431 A2 EP 0181431A2 EP 85106483 A EP85106483 A EP 85106483A EP 85106483 A EP85106483 A EP 85106483A EP 0181431 A2 EP0181431 A2 EP 0181431A2
Authority
EP
European Patent Office
Prior art keywords
circular saw
workpiece
saw blade
sawing
sawn
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.)
Withdrawn
Application number
EP85106483A
Other languages
German (de)
French (fr)
Other versions
EP0181431A3 (en
Inventor
Siegfried Thiele
Horst Kettig
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.)
Wilhelm Altendorf GmbH and Co KG
Original Assignee
Wilhelm Altendorf GmbH and Co KG
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 Wilhelm Altendorf GmbH and Co KG filed Critical Wilhelm Altendorf GmbH and Co KG
Publication of EP0181431A2 publication Critical patent/EP0181431A2/en
Publication of EP0181431A3 publication Critical patent/EP0181431A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/10—Measures preventing splintering of sawn portions of wood

Definitions

  • the invention relates to a method for separating sawing of workpieces with two outer edges lying opposite one another in the separating direction, in particular for cross cutting of coated wooden panels with at least one longitudinal edge which is very rounded in cross section.
  • the invention is based on the object of specifying a sawing method with the aid of which the cutting edges can be torn out, in particular also in the area of preformed longitudinal edges of panels or profile edges.
  • This object is achieved in that the workpiece is first sawn from one side over its entire thickness, but over a depth that only slightly exceeds the outer edge area, and then from the other side - in line with the saw cut - sawn through. In this way it is avoided that the saw cut in the endangered longitudinal edge area is carried out to a certain extent out of the plate, which - as has been established - encouraged tearing out.
  • this method can be particularly advantageously realized when working with two aligned circular saw blades which are so driven in opposite directions, are that in the sawing mfangsvektoren their U opposite to each other and thereby the saw blades a the feed path of the workpiece defining the table plane Push through with a selectable effective height, and proceed in such a way that the workpiece is first advanced against the fully extended second circular saw blade when the first circular saw blade is below the table level and a partial cut of limited length (in the direction of the workpiece depth) is made that penetrates the entire workpiece thickness;
  • the drawing figures show a schematic side view of the arrangement of a main saw blade 1 ("first circular saw blade”) and a scoring saw blade 2 ("second circular saw blade”) on a sliding table saw.
  • first circular saw blade a main saw blade 1
  • second circular saw blade a scoring saw blade 2
  • the workpiece 5 is advanced in the direction indicated by an arrow 6 using a slide 4.
  • the main saw blade 1 and the scoring saw blade 2 are pneumatically adjustable in height; the scoring saw blade 2 swivels about the axis 7.
  • the arrows on the images of the circular saw blades indicate their direction of rotation, the arrows on the outside indicate the direction of adjustment of the circular saw blades 1, 2.
  • the main saw blade 1 is extended upwards (more or less fully) (arrow 11), while the scoring saw blade 2 is only lifted into its scoring position, which does not exceed the table level 3; this is indicated by the stop 9 on arrow 8.
  • the workpiece 5 is advanced according to arrow 6 in Figure 4 (to the left in the drawing).
  • both saw blades 1, 2 are again lowered below the table level 3, so that the workpiece 5 can be removed and exchanged for another one.
  • the movements of the circular saw blades 1, 2 described above are preferably carried out pneumatically and are each controlled by adjustable limit switches in the feed path of the workpiece. Both circular saw blades 1, 2 (lying in the same plane) have the same thickness; the scoring saw blade has an unusually large diameter that comes close to that of the main saw blade 1.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

During the transverse cutting of work pieces that are liable to tear out, a first notch is initially sawn into the work piece by means of a circular saw blade in one longitudinal edge portion thereof and is then sawn through, starting from the other longitudinal edge by means of a second, circular saw blade of the same thickness oppositely driven in the same plane. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum trennenden Sägen von Werkstücken mit zwei in Trennrichtung einander gegenüberliegenden Außenrändern, insbesondere zum Querschneiden von beschichteten Holzplatten mit mindestens einem im Querschnitt stark gerundeten Längsrand.The invention relates to a method for separating sawing of workpieces with two outer edges lying opposite one another in the separating direction, in particular for cross cutting of coated wooden panels with at least one longitudinal edge which is very rounded in cross section.

Entlang mindestens einem ihrer Längsseitenränder in besonderer Weise geformte und/oder beschichtete bzw. furnierte Holzplatten sind beispielsweise als Arbeitsplatten für Einbauküchen weit verbreitet. Das Querschneiden solcher Platten bereitet Schwierigkeiten, weil es insbesondere am geformten Plattenrand leicht zum Ausreißen der Schnittkanten kommt. Das gleiche gilt aber auch für Profile unterschiedlichsten Querschnitts und sogar homogenen Platten von Rechteckquerschnitt.Along at least one of their long side edges, wooden panels that are shaped and / or coated or veneered in a special way are widely used, for example, as worktops for fitted kitchens. The cross-cutting of such plates is difficult because the cut edges are easily torn off, particularly on the shaped plate edge. The same also applies to profiles of various cross-sections and even homogeneous plates of rectangular cross-section.

Der Erfindung liegt die Aufgabe zugrunde, ein Sägeverfahren anzugeben, mit dessen Hilfe das Ausreißen der Schnittkanten insbesondere auch im Bereich vorgeformter Platten-Längsränder oder Profilkanten vermieden werden kann.The invention is based on the object of specifying a sawing method with the aid of which the cutting edges can be torn out, in particular also in the area of preformed longitudinal edges of panels or profile edges.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Werkstück zunächst von einer Seite über seine gesamte Dicke, aber über eine den Außenrandbereich nur wenig übersteigende Tiefe angesägt und anschließend von der anderen Seite her - mit dem Ansägeschnitt fluchtend - durchgesägt wird. Auf diese Weise wird vermieden, daß der Sägeschnitt im gefährdeten Längsrandbereich gewissermaßen aus der Platte heraus nach außen vorgetragen wird, was - wie festgestellt wurde - das Ausreißen begünstigte.This object is achieved in that the workpiece is first sawn from one side over its entire thickness, but over a depth that only slightly exceeds the outer edge area, and then from the other side - in line with the saw cut - sawn through. In this way it is avoided that the saw cut in the endangered longitudinal edge area is carried out to a certain extent out of the plate, which - as has been established - encouraged tearing out.

Es wurde ferner gefunden, daß sich dieses Verfahren besonders vorteilhaft realisieren läßt, wenn man mit zwei, miteinander fluchtenden Kreissägeblättern arbeitet, die derart gegenläufig angetrieben werden, daß im Sägebereich ihre Umfangsvektoren einander entgegengerichtet sind und dabei die Kreissägeblätter eine die Vorschubbahn des Werkstücks definierende Tischebene mit wählbarer Wirkhöhe durchsetzen, und man dabei so vorgeht, daß zunächst bei unter die Tischebene abgesenktem ersten Kreissägeblatt das Werkstück gegen das voll ausgefahrene zweite Kreissägeblatt vorgeschoben und ein die ganze Werkstücksdicke durchsetzender Teilschnitt von begrenzter Länge (in Richtung der Werkstücktiefe) eingebracht wird;It has further been found that this method can be particularly advantageously realized when working with two aligned circular saw blades which are so driven in opposite directions, are that in the sawing mfangsvektoren their U opposite to each other and thereby the saw blades a the feed path of the workpiece defining the table plane Push through with a selectable effective height, and proceed in such a way that the workpiece is first advanced against the fully extended second circular saw blade when the first circular saw blade is below the table level and a partial cut of limited length (in the direction of the workpiece depth) is made that penetrates the entire workpiece thickness;

daß hierauf das zweite Kreissägeblatt unter die Tischebene abgesenkt und das Werkstück darüber hinweg in der gleichen Richtung weiter vorgeschoben wird;that the second circular saw blade is then lowered below the table level and the workpiece is advanced further in the same direction;

und daß anschließend das erste Kreissägeblatt voll sowie das zweite Kreissägeblatt nur wenig über die Tischebene ausgefahren werden und das Werkstück in entgegengesetzter Richtung nacheinander in Eingriff mit dem zweiten Kreissägeblatt und dem ersten Kreissägeblatt vorgeschoben wird.and that the first circular saw blade is full and the second circular saw blade is only slightly extended over the table level and the workpiece is pushed in the opposite direction one after the other into engagement with the second circular saw blade and the first circular saw blade.

Die Erfindung wird nachstehend anhand der in der Zeichnung schematisch dargestellten Verfahrensstadien näher beschrieben.The invention is described below with reference to the stages of the process shown schematically in the drawing.

Die Zeichnungsfiguren zeigen in schematischer Seitenansicht die Anordnung eines Hauptsägeblattes 1 ("erstes Kreissägeblatt") und eines Vorritz-Sägeblatts 2 ("zweites Kreissägeblatt") an einer Formatkreissäge. Auf dem nur angedeuteten Werkzeugtisch mit der Tischebene 3 (der regelmäßig - jedenfalls zum größten Teil - von einem Rollwagen gebildet wird) wird mit Hilfe eines Schiebers 4 das Werkstück 5 in der jeweils durch einen Pfeil 6 angegebenen Richtung vorgeschoben.The drawing figures show a schematic side view of the arrangement of a main saw blade 1 ("first circular saw blade") and a scoring saw blade 2 ("second circular saw blade") on a sliding table saw. On the only indicated tool table with the table level 3 (which is regularly - at least for the most part - formed by a trolley), the workpiece 5 is advanced in the direction indicated by an arrow 6 using a slide 4.

Das Hauptsägeblatt 1 und das Vorritz-Sägeblatt 2 sind pneumatisch höhenverstellbar; das Vorritz-Sägeblatt 2 schwenkt dabei um die Achse 7. Die auf den Abbildungen der Kreissägeblätter angebrachten Pfeile geben deren Drehrichtung an, die außen liegenden Pfeile die Verstellrichtung der Kreissägeblätter 1,2.The main saw blade 1 and the scoring saw blade 2 are pneumatically adjustable in height; the scoring saw blade 2 swivels about the axis 7. The arrows on the images of the circular saw blades indicate their direction of rotation, the arrows on the outside indicate the direction of adjustment of the circular saw blades 1, 2.

Beim Betriebszustand der Figur 1 hat der erste Verfahrensschritt bereits begonnen: Das Hauptsägeblatt 1 ist unter die Tischebene 3 abgesenkt worden, während das Vorritz-Sägeblatt 2 voll nach oben ausgefahren wurde und die Tischebene 3 soweit überragt, daß es das Werkstück 5 über dessen ganze Dicke (= Höhe in der Zeichnung) anschneidet.In the operating state of FIG. 1, the first process step has already begun: the main saw blade 1 has been lowered below the table level 3, while the scoring saw blade 2 has been fully extended and extends over the table level 3 so far that it overlays the workpiece 5 over its entire thickness (= Height in the drawing).

Dieser Augenblick ist in Figur 2 dargestellt. Sobald der Schnitt etwa die punktiert angegebene Linie im Werkstück 5 erreicht hat, wird das Vorritz-Kreissägeblatt 2 (durch Schwenken um die Achse 7) gemäß dem Pfeil 8 - nahezu schlagartig - unter die Tischebene 3 abgesenkt. Der Vorschub des Werkstücks 5 (nach rechts in der Zeichnung) wird jedoch fortgesetzt, bis die in Figur 3 dargestellte Endstellung erreicht ist.This moment is shown in Figure 2. As soon as the cut has approximately reached the dotted line in the workpiece 5, the scoring circular saw blade 2 (by swiveling around the axis 7) is lowered - almost suddenly - below the table level 3 according to the arrow 8. However, the feed of the workpiece 5 (to the right in the drawing) continues until the end position shown in FIG. 3 is reached.

Jetzt wird gemäß Figur 4 das Hauptsägeblatt 1 nach oben (mehr oder weniger voll) ausgefahren (Pfeil 11), während das Vorritz-Sägeblatt 2 nur in seine - die Tischebene 3 wenig überragende - Vorritzstellung gehoben wird; dies ist durch den Anschlag 9 am Pfeil 8 angedeutet. Jetzt wird das Werkstück 5 gemäß Pfeil 6 in Figur 4 (nach links in der Zeichnung) vorgeschoben. Das Sägeblatt 2 ritzt den einzubringenden Trennschnitt über die gesamte Tiefe des Werkstücks (= Länge des Schnitts) vor, während das Hauptsägeblatt 1 den eigentlichen Trennschnitt einbringt, welcher vor Erreichen des gegenüberliegenden Längsrandes des Werkstücks 5 in den dort eingebrachten Anschnitt (punktierte Linie in Figur 2) einmündet.Now, according to FIG. 4, the main saw blade 1 is extended upwards (more or less fully) (arrow 11), while the scoring saw blade 2 is only lifted into its scoring position, which does not exceed the table level 3; this is indicated by the stop 9 on arrow 8. Now the workpiece 5 is advanced according to arrow 6 in Figure 4 (to the left in the drawing). The saw blade 2 scoops the separating cut to be made over the entire depth of the workpiece (= length of the cut), while the main saw blade 1 introduces the actual separating cut, which, before reaching the opposite longitudinal edge of the workpiece 5, into the cut (dotted line in FIG. 2) ) flows into.

Alsdann werden gemäß Figur 5 aus Sicherheitsgründen beide Sägeblätter 1, 2 wieder unter die Tischebene 3 abgesenkt, damit das Werkstück 5 entnommen und gegen ein anderes ausgetauscht werden kann.Then, according to FIG. 5, for safety reasons, both saw blades 1, 2 are again lowered below the table level 3, so that the workpiece 5 can be removed and exchanged for another one.

Die vorstehend beschriebenen Bewegungen der Kreissägeblätter 1,2 werden vorzugsweise pneumatisch vorgenommen und jeweils durch einstellbare Endschalter im Vorschubweg des Werkstücks gesteuert. Beide (in derselben Ebene liegenden) Kreissägeblätter 1, 2 haben die gleiche Dicke; das Vorritz-Sägeblatt hat einen unüblich großen Durchmesser, der an den des Hauptsägeblatts 1 herankommt.The movements of the circular saw blades 1, 2 described above are preferably carried out pneumatically and are each controlled by adjustable limit switches in the feed path of the workpiece. Both circular saw blades 1, 2 (lying in the same plane) have the same thickness; the scoring saw blade has an unusually large diameter that comes close to that of the main saw blade 1.

Claims (4)

1. Verfahren zum trennenden Sägen von Werkstücken mit zwei in Trennrichtung einander gegenüberliegenden Außenrändern, insbesondere zum Querschneiden von beschichteten Holzplatten mit mindestens einem im Querschnitt stark gerundetem Längsrand,
dadurch gekennzeichnet, daß das Werkstück zunächst von einer Seite über seine gesamte Dicke, aber über eine den Außenrandbereich nur wenig übersteigende Tiefe angesägt und anschließend von der anderen Seite her - mit dem Ansägeschnitt fluchtend - durchgesägt wird.1. Method for separating sawing of workpieces with two outer edges lying opposite one another in the separating direction, in particular for cross-cutting coated wooden panels with at least one longitudinal edge that is very rounded in cross section.
characterized in that the workpiece is first sawn from one side over its entire thickness, but over a depth that only slightly exceeds the outer edge area, and is then sawn through from the other side, flush with the sawing cut. 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß vor dem Durchsägen das Werkstück ebenfalls von der anderen Seite her über nur einen Teil seiner Dicke vorgesägt wird.2. The method according to claim 1,
characterized in that the workpiece is also pre-sawn from the other side over only part of its thickness before sawing through. 3. Verfahren nach Anspruch 1 und 2 mit Hilfe zweier miteinander fluchtender, derart gegenläufig angetriebener Kreissägeblätter, daß im Sägebereich ihre Umfangsvektoren einander entgegengerichtet sind, wobei die Kreissägeblätter die die Vorschubbahn des Werkstücks definierende Tischebene mit wählbarer Wirkhöhe durchsetzen, dadurch gekennzeichnet, daß zunächst bei unter die Tischebene (3) abgesenktem erstem Kreissägeblatt (1) das Werkstück (5) gegen das voll ausgefahrene zweite Kreissägeblatt (2) vorgeschoben und ein die ganze Werkstückdicke durchsetzender Teilschnitt von begrenzter Länge (in Richtung der Werkstücktiefe) eingebracht wird;
daß hierauf das zweite Kreissägeblatt (2) unter die Tischebene (3) abgesenkt und das Werkstück (5) darüber hinweg in der gleichen Richtung weiter vorgeschoben wird;
und daß anschließend das erste Kreissägeblatt (1) voll sowie das zweite Kreissägeblatt (2) nur wenig über die Tischebene (3) ausgefahren werden und das Werkstück (5) in entgegengesetzter Richtung nacheinander in Eingriff mit dem zweiten Kreissägeblatt (2) und dem ersten Kreissägeblatt (1) vorgeschoben wird.3. The method according to claim 1 and 2 with the help of two mutually aligned, such counter-rotating circular saw blades that their circumferential vectors are opposed to each other in the sawing area, the circular saw blades enforcing the table plane defining the feed path of the workpiece with a selectable effective height, characterized in that initially at under the table plane (3) of the first circular saw blade (1) lowered, the workpiece (5) is advanced against the fully extended second circular saw blade (2) and a partial cut of limited length penetrating the entire workpiece thickness is introduced (in the direction of the workpiece depth);
that the second circular saw blade (2) is then lowered below the table level (3) and the workpiece (5) is advanced further in the same direction;
and that the first circular saw blade (1) and the second circular saw blade (2) are then only slightly extended over the table level (3) and the workpiece (5) in the opposite direction one after the other engages with the second circular saw blade (2) and the first circular saw blade (1) is advanced. 4. Verfahren nach Anspruch 3,
dadurch gekennzeichnet, daß die Höhensteuerung der Kreissägeblätter (1,2) gegenüber der Tischebene (3) pneumatisch erfolgt.4. The method according to claim 3,
characterized in that the height control of the circular saw blades (1, 2) with respect to the table level (3) takes place pneumatically.
EP85106483A 1984-10-27 1985-05-25 Method for cutting up work pieces by sawing Withdrawn EP0181431A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3439443 1984-10-27
DE19843439443 DE3439443A1 (en) 1984-10-27 1984-10-27 METHOD FOR SEPARATELY SAWING WORKPIECES

Publications (2)

Publication Number Publication Date
EP0181431A2 true EP0181431A2 (en) 1986-05-21
EP0181431A3 EP0181431A3 (en) 1987-12-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106483A Withdrawn EP0181431A3 (en) 1984-10-27 1985-05-25 Method for cutting up work pieces by sawing

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EP (1) EP0181431A3 (en)
AU (1) AU4856285A (en)
DE (1) DE3439443A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190626A (en) * 1986-05-21 1987-11-25 Bmsm Limited Wood shaping machine and process
AU586366B2 (en) * 1987-04-16 1989-07-06 Frank James Ogden Improvements to travelling wood cutting circular saws
EP0395617A2 (en) * 1989-04-28 1990-10-31 Machinebouw Constant Philips N.V. Sawing procedure and sawing mechanism with floating pre-grooving saw that uses such procedure
ES2228254A1 (en) * 2003-05-21 2005-04-01 Ortza, S. Coop. Postformed board cutting system, has blade provided on lower scratched face, input side edge and upper face of postformed board, where blade is made to cut along side edge of exit part of board

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1223793A (en) * 1986-06-23 1987-07-07 Jacques Ducharme Scoring saw

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440227A1 (en) * 1973-09-07 1975-03-13 Giroud Olma Ag Cutting laminated wooden panels with circular saw - moved to cut facing narrow side in initial position up to line intersecting further edge
DE2602921A1 (en) * 1975-02-05 1976-08-19 Schelling & Co PROCEDURE FOR SEPARATING FURNITURE PANELS AND EQUIPMENT FOR CARRYING OUT THIS PROCESS
DE2636529A1 (en) * 1975-08-15 1977-02-24 Heid Ag Hans Machine saw for veneered boards - has two circular saw blades moving in synchronism about fixed workpiece to avoid splitting
DE2740673A1 (en) * 1976-09-20 1978-03-23 Giben Impianti Spa CIRCULAR SAW MACHINE FOR PLATES, PLATE PACKAGES OR DGL.
GB2020606A (en) * 1978-05-11 1979-11-21 Scheer & Cie C F Method and apparatus for dividing boards and other sheet material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440227A1 (en) * 1973-09-07 1975-03-13 Giroud Olma Ag Cutting laminated wooden panels with circular saw - moved to cut facing narrow side in initial position up to line intersecting further edge
DE2602921A1 (en) * 1975-02-05 1976-08-19 Schelling & Co PROCEDURE FOR SEPARATING FURNITURE PANELS AND EQUIPMENT FOR CARRYING OUT THIS PROCESS
DE2636529A1 (en) * 1975-08-15 1977-02-24 Heid Ag Hans Machine saw for veneered boards - has two circular saw blades moving in synchronism about fixed workpiece to avoid splitting
DE2740673A1 (en) * 1976-09-20 1978-03-23 Giben Impianti Spa CIRCULAR SAW MACHINE FOR PLATES, PLATE PACKAGES OR DGL.
GB2020606A (en) * 1978-05-11 1979-11-21 Scheer & Cie C F Method and apparatus for dividing boards and other sheet material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190626A (en) * 1986-05-21 1987-11-25 Bmsm Limited Wood shaping machine and process
GB2190626B (en) * 1986-05-21 1990-03-21 Bmsm Limited Wood shaping machine and process
AU586366B2 (en) * 1987-04-16 1989-07-06 Frank James Ogden Improvements to travelling wood cutting circular saws
EP0395617A2 (en) * 1989-04-28 1990-10-31 Machinebouw Constant Philips N.V. Sawing procedure and sawing mechanism with floating pre-grooving saw that uses such procedure
EP0395617A3 (en) * 1989-04-28 1991-02-06 Machinebouw Constant Philips N.V. Sawing procedure and sawing mechanism with floating pre-grooving saw that uses such procedure
ES2228254A1 (en) * 2003-05-21 2005-04-01 Ortza, S. Coop. Postformed board cutting system, has blade provided on lower scratched face, input side edge and upper face of postformed board, where blade is made to cut along side edge of exit part of board

Also Published As

Publication number Publication date
DE3439443A1 (en) 1986-04-30
AU4856285A (en) 1986-05-01
EP0181431A3 (en) 1987-12-02

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