EP0261263B1 - Cutting system for oblique cutting drum-type cutters - Google Patents

Cutting system for oblique cutting drum-type cutters Download PDF

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Publication number
EP0261263B1
EP0261263B1 EP86113106A EP86113106A EP0261263B1 EP 0261263 B1 EP0261263 B1 EP 0261263B1 EP 86113106 A EP86113106 A EP 86113106A EP 86113106 A EP86113106 A EP 86113106A EP 0261263 B1 EP0261263 B1 EP 0261263B1
Authority
EP
European Patent Office
Prior art keywords
flake
knife
knife body
drum
blade face
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
EP86113106A
Other languages
German (de)
French (fr)
Other versions
EP0261263A1 (en
Inventor
Reinhold W. Dr.-Ing. Elsen
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.)
Individual
Original Assignee
Individual
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
Priority to DE19853515305 priority Critical patent/DE3515305A1/en
Application filed by Individual filed Critical Individual
Priority to AT86113106T priority patent/ATE44679T1/en
Priority to EP86113106A priority patent/EP0261263B1/en
Publication of EP0261263A1 publication Critical patent/EP0261263A1/en
Application granted granted Critical
Publication of EP0261263B1 publication Critical patent/EP0261263B1/en
Expired 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
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/005—Tools therefor

Definitions

  • the invention relates to a cutting system according to the preamble of claim 1.
  • a cutting system is known from DE-A 2 721 930.
  • the invention has for its object to increase the amount of high quality, flat chips relative to the capacity of the knife shaft clamping machine while reducing the cost of chips.
  • the features of claim 1 serve to achieve this object.
  • the step-like design of the cutting system for inclined knife installation creates a pseudo-straight-cut knife shaft that cuts the cross-fed wood parallel to the barrel like a straight-cut knife shaft, resulting in more uniform, flat chips with a lower bulk density than with an oblique flat cut.
  • the knife shaft surface consists of strung cylinder sleeves that are easier to manufacture than the rotating body surfaces required for the oblique flat cut, e.g. Hyperboloids.
  • the cross-fed wood needs the surface of the knife shaft as a wooden support. Since such a support is also missing in the known systems along its greatest length directly in front of the chip knives - there are only a few narrow webs, in addition to the inaccuracy of the chip thickness, the formation of splinters during machining is also promoted. The wood chips then have to be shredded in order to be processed in chipboard, which has an adverse effect on the manufacturing costs of the chips.
  • the wooden support of the knife holder is also designed in a step-like manner with a constant step height and forms bridges in front of the cutting edge sections with webs over the chip discharge flanks of the knife shaft surface, which bridges delimit an equal, normal knife board above the knife shaft surface as well as immediately before each cutting edge section an equal cutting gap with the knife breast of the cutting edge sections.
  • the wood support immediately before each cutting edge section provides a more precise chip thickness limitation, which is further supported by calibration in the cutting gap, as a result of which the formation of chips is suppressed and the amount of flat and dimensionally stable chips is increased.
  • the chip knife in its simple form can be made from thin sheet metal, it also indirectly reduces the cost of chips, and by calibrating the chips in the cutting gap, the knife cutting edge sections are largely protected against deformation, which is advantageously supported by the adjustability of the cutting gap.
  • Figure 1 shows in a section the section of a knife shaft with a chip knife inserted obliquely to the knife shaft axis along the section line II of Figure 3
  • Figure 2 shows the plan view of the knife holder with chip knife and a support plate in direction A of Figure 1
  • Figure 3 shows the section of the plan view of Knife shaft according to FIG. 1.
  • chip knives 2 are evenly distributed over the circumference, which are fixed on knife holders 3 with the aid of support plates 4 and are also held in the knife shaft 1 with the aid of clamping wedges 5.
  • the wood which is fed transversely in direction A, is supported on the knife shaft surface and thus also on the webs 6, which form this surface directly in front of the chip knives 2, while the knife shaft 1 rotates in the direction of arrow 7 and the cutting edge sections 8 with a constant step height 9 on cylindrical surfaces between the parallel circles 10; 10 'move. Accordingly, the wood-supporting surfaces of the knife shaft surface lie concentrically on cylinders between the parallel circles 15; 15 '.
  • the transition cutting edges 18 serve to connect the cutting edge sections 8 to one another.
  • the chips pass through the cutting gaps 19 via the chip discharge flanks 20 of the knife holder 3, where they are broken to approximately the same length, into the chip collecting spaces 21, which are divided into certain sections by partition walls 22, which support the wood as part of the knife shaft surface and as supports 23 find their corresponding continuation for the webs 6. After the rotation of the knife shaft 1 from the area of the supplied wood, the chip collecting spaces 21 can empty.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Abstract

1. A cutting system for producing flakes of wood with a drum-tupe cutter (1) including grooves, equispaced over the periphery and obliquely disposed to the axis of said drum, for fixing each one knife holder (3) with baffle flank (20), one continous flake knife body (2) essentially disposed radially and one clamping wedge (5), situated close to the knife holder (3), wiht flake colleting recesses (21) divided by parting walls (22), and the blade face of said flake knife body is profiled and said knife holder (3) has a corresponding profile form for the adaption close to the blade face of the flake knife body (2), and also the first flank of said flake knife body is positioned in a plane, further including said blade face of the flake knife body having a ladder shaped form with consecutive displaced cutting edge sections (8) in peripheral sense parallel to said axis, connected by essentially in peripheral sense disposed transitional cutting edges (18) with constant riser (9), and also including surface of said drum-type cutter consisting of cylinder jackets with graded diameters against each other and forming the same distance to the cutting edge sections (8).

Description

Die Erfindung betrifft ein Schneidsystem nach dem Oberbegriff des Patentanspruchs 1. Ein solches Schneidsystem ist aus DE-A 2 721 930 bekannt.The invention relates to a cutting system according to the preamble of claim 1. Such a cutting system is known from DE-A 2 721 930.

Der Erfindung liegt die Aufgabe zugrunde, die Menge qualitativ hochwertiger, flächiger Späne relativ zur Kapazität der Messerwellen-Spannmaschine bei gleichzeitiger Verringerung der Spänekosten zu erhöhen. Zur Lösung dieser Aufgabe dienen die Merkmale des Patentanspruchs 1.The invention has for its object to increase the amount of high quality, flat chips relative to the capacity of the knife shaft clamping machine while reducing the cost of chips. The features of claim 1 serve to achieve this object.

Durch die treppenförmige Gestaltung des Schneidsystems für den schrägen Messereinbau wird eine Pseudogeradschnitt-Messerwelle geschaffen, die wie eine Gradschnitt-Messerwelle das quer zugeführte Holz fasserparallel schneidet, wodurch gleichmäßigere flächige Späne mit geringerem Schüttgewicht entstehen als bei schrägem Flachschnitt. Die Messerwellenoberfläche besteht aus aneinandergereihten Zylindermänteln, die leichter herzustellen sind als die zum schrägen Flachschnitt erforderlichen Rotationskörperoberflächen, wie z.B. Hyperboloide.The step-like design of the cutting system for inclined knife installation creates a pseudo-straight-cut knife shaft that cuts the cross-fed wood parallel to the barrel like a straight-cut knife shaft, resulting in more uniform, flat chips with a lower bulk density than with an oblique flat cut. The knife shaft surface consists of strung cylinder sleeves that are easier to manufacture than the rotating body surfaces required for the oblique flat cut, e.g. Hyperboloids.

Zur Bemessung der Spandicke benötigt das quer zugeführte Holz die Oberfläche der Messerwelle als Holzabstützung. Da ferner eine solche Abstützung bei den bekannten Systemen auf ihrer größten Länge unmittelbar vor den Spanmessern fehlt - es sind nur einige schmale Stege-, wird neben der Ungenauigkeit der Spandicke auch die Splitterbildung bei der Zerspanung gefördert. Die Holzsplitter müssen dann noch einer Nachzerkleinerung zugeführt werden, um in Spanplatten verarbeitet werden zu können, was sich damit ungünstig auf die Herstellkosten der Späne auswirkt. Vorteilhafterweise ist deshalb vorgesehen, daß, die Holzabstützung der Messerhalter ebenfalls treppenförmig mit konstanter Stufenhöhe ausgebildet ist und vor den Schneidkantenabschnitten mit Stegen über den Spanablaufflanken der Messerwellenoberfläche angehörende Brücken bildet, die unmittelbar vor jedem Schneidkantenabschnitt sowohl einen gleichen, normalen Messervorstand über der Messerwellenoberfläche begrenzen als auch einen gleichen Schneidspalt mit der Messerbrust der Schneidkantenabschnitte.To measure the chip thickness, the cross-fed wood needs the surface of the knife shaft as a wooden support. Since such a support is also missing in the known systems along its greatest length directly in front of the chip knives - there are only a few narrow webs, in addition to the inaccuracy of the chip thickness, the formation of splinters during machining is also promoted. The wood chips then have to be shredded in order to be processed in chipboard, which has an adverse effect on the manufacturing costs of the chips. Advantageously, it is therefore provided that the wooden support of the knife holder is also designed in a step-like manner with a constant step height and forms bridges in front of the cutting edge sections with webs over the chip discharge flanks of the knife shaft surface, which bridges delimit an equal, normal knife board above the knife shaft surface as well as immediately before each cutting edge section an equal cutting gap with the knife breast of the cutting edge sections.

Ferner ist durch die Holzabstützung unmittelbar vor jedem Schneidkantenabschnitt eine genauere Spandickenbegrenzung gegeben, die durch eine Kalibrierung im Schneidspalt noch unterstützt wird, wodurch die Splitterbildung unterdrückt und damit die Menge flächiger und maßhaltiger Späne erhöht wird. Da die Spanmesser in ihrer einfachen Form aus dünnem Blech hergestellt werden können, ist mittelbar auch eine Spänekostenverringerung damit verbunden, und durch die Kalibrierung der Späne im Schneidspalt werden die Messerschneidkantenabschnitte gegen Deformation weitgehend geschützt, was durch eine Justierbarkeit des Schneidspalts vorteilhaft unterstützt wird.Furthermore, the wood support immediately before each cutting edge section provides a more precise chip thickness limitation, which is further supported by calibration in the cutting gap, as a result of which the formation of chips is suppressed and the amount of flat and dimensionally stable chips is increased. Since the chip knife in its simple form can be made from thin sheet metal, it also indirectly reduces the cost of chips, and by calibrating the chips in the cutting gap, the knife cutting edge sections are largely protected against deformation, which is advantageously supported by the adjustability of the cutting gap.

Die Figuren erläutern an einem Ausführungsbeispiel den Erfindungsgedanken. Figur 1 zeigt in einem Schnitt den Ausschnitt einer Messerwelle mit schräg zur Messerwellenachse eingesetztem Spanmesser entlang der Schnittlinie I-I der Figur 3, Figur 2 die Draufsicht auf den Messerhalter mit Spanmesser und eine Stützplatte in Richtung A der Figur 1 und Figur 3 den Ausschnitt der Draufsicht der Messerwelle gemäß Figur 1.The figures explain the inventive concept using an exemplary embodiment. Figure 1 shows in a section the section of a knife shaft with a chip knife inserted obliquely to the knife shaft axis along the section line II of Figure 3, Figure 2 shows the plan view of the knife holder with chip knife and a support plate in direction A of Figure 1 and Figure 3 shows the section of the plan view of Knife shaft according to FIG. 1.

In der Messerwelle 1 sind Spanmesser 2 gleichmäßig auf dem Umfang verteilt angeordnet, welche auf Messerhaltern 3 mit Hilfe von Stützplatten 4 fixiert und desweiteren mit Hilfe von Klemmkeilen 5 in der Messerwelle 1 festgehalten werden. Das etwa in Richtung A quer zugeführte Holz stützt sich auf der Messerwellenoberfläche ab und damit auch auf den Stegen 6, die unmittelbar vor den Spanmessern 2 diese Oberfläche bilden, während sich die Messerwelle 1 in Pfeilrichtung 7 dreht und die Schneidkantenabschnitte 8 mit konstanter Stufenhöhe 9 sich auf Zylinderflächen zwischen den Parallelkreisen 10; 10' bewegen. Entsprechend liegen die das Holz abstützenden Flächen der Messerwellenoberfläche konzentrisch auf Zylindern zwischen den Parallelkreisen 15; 15'. Die Übergangsschneidkanten 18 dienen der Verbindung der Schneidkantenabschnitte 8 miteinander. Die Späne gelangen durch die Schneidspalten 19 über die Spanablaufflanken 20 der Messerhalter 3, wo sie etwa auf gleiche Länge gebrochen werden, in die Spänesammelräume 21, die durch Trennwände 22 in bestimmte Abschnitte eingeteilt sind, welche als Teil der Messerwellenoberfläche das Holz abstützen und als Stützen 23 für die Stege 6 ihre entsprechende Fortsetzung finden. Nach der Drehung der Messerwelle 1 aus dem Bereich des zugeführten Holzes können sich die Spänesammelräume 21 entleeren.In the knife shaft 1, chip knives 2 are evenly distributed over the circumference, which are fixed on knife holders 3 with the aid of support plates 4 and are also held in the knife shaft 1 with the aid of clamping wedges 5. The wood, which is fed transversely in direction A, is supported on the knife shaft surface and thus also on the webs 6, which form this surface directly in front of the chip knives 2, while the knife shaft 1 rotates in the direction of arrow 7 and the cutting edge sections 8 with a constant step height 9 on cylindrical surfaces between the parallel circles 10; 10 'move. Accordingly, the wood-supporting surfaces of the knife shaft surface lie concentrically on cylinders between the parallel circles 15; 15 '. The transition cutting edges 18 serve to connect the cutting edge sections 8 to one another. The chips pass through the cutting gaps 19 via the chip discharge flanks 20 of the knife holder 3, where they are broken to approximately the same length, into the chip collecting spaces 21, which are divided into certain sections by partition walls 22, which support the wood as part of the knife shaft surface and as supports 23 find their corresponding continuation for the webs 6. After the rotation of the knife shaft 1 from the area of the supplied wood, the chip collecting spaces 21 can empty.

Claims (3)

1. A cutting system for producing flakes of wood with a drum-type cutter (1) including grooves, equispaced over the periphery and obliquely disposed to the axis of said drum, for fixing each one knife holder (3) with baffle flank (20), one continuous flake knife body (2) essentially disposed radially and one clamping wedge (5), situated close to the knife holder (3), with flake collecting recesses (21) divided by parting walls (22), and the blade face of said flake knife body is profiled and said knife holder (3) has a corresponding profile form for the adaption close to the blade face of the flake knife body (2), and also the first flank of said flake knife body is positioned in a plane, further including said blade face of the flake knife body having a ladder shaped form with consecutive displaced cutting edge sections (8) in peripheral sense parallel to said axis, connected by essentially in peripheral sense disposed transitional cutting edges (18) with constant riser (9), and also including a surface of said drum-type cutter consisting of cylinder jackets with graded diameters against each other and forming the same distance to the cutting edge sections (8).
2. A cutting system as claimed in claim 1 wherein the knife holders (3) have wood supportings (6) also formed ladder shaped with constant riser (9) and disposed in the form of webs (6) above the baffle flanks (20), and the surface of the webs belongs to the cylinder jackets of the drum-type cutter surface and the webs limit a blade clearance with the blade face of the flaking knife body (2) equalizing the distance between the webs and the blade face and the distance between the cylinder jackets and the cutting edge sections (8).
3. A cutting system as claimed in claim 2 wherein the blade clearance is adjustable and changes in the flake run down sense into an expanding canal.
EP86113106A 1985-04-27 1986-09-24 Cutting system for oblique cutting drum-type cutters Expired EP0261263B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853515305 DE3515305A1 (en) 1985-04-27 1985-04-27 Cutter-spindle cutting system
AT86113106T ATE44679T1 (en) 1986-09-24 1986-09-24 CUTTING SYSTEM FOR BEVEL CUT CUTTER SHAFTS.
EP86113106A EP0261263B1 (en) 1986-09-24 1986-09-24 Cutting system for oblique cutting drum-type cutters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86113106A EP0261263B1 (en) 1986-09-24 1986-09-24 Cutting system for oblique cutting drum-type cutters

Publications (2)

Publication Number Publication Date
EP0261263A1 EP0261263A1 (en) 1988-03-30
EP0261263B1 true EP0261263B1 (en) 1989-07-19

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ID=8195439

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Application Number Title Priority Date Filing Date
EP86113106A Expired EP0261263B1 (en) 1985-04-27 1986-09-24 Cutting system for oblique cutting drum-type cutters

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EP (1) EP0261263B1 (en)
AT (1) ATE44679T1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519597C1 (en) * 1995-05-29 1996-03-07 Reinhold W Dr Ing Elsen Angle=cut knife shaft with spiral knives to make wood chips

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721930A1 (en) * 1977-05-14 1978-11-16 Hombak Maschinenfab Kg Flat set length wood chip cutting machine blades - are acute angled with alternating radially outward and inward cutting edges

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1033888B (en) * 1957-01-24 1958-07-10 Paul Kirsten Dr Ing Tool carrier for cutting machines for the production of chips for wood chipboard production
DE1111801B (en) * 1959-04-14 1961-07-27 Hombak Maschinenfab Kg Knife roller for wood cutting machines
CH418618A (en) * 1962-01-29 1966-08-15 Kirsten Paul Ing Dr Roller-shaped tool carrier for wood cutting machines
DE1202965B (en) * 1962-09-04 1965-10-14 Paul Kirsten Dr Ing Knives for chipping wood
DE1207067B (en) * 1963-02-05 1965-12-16 Paul Kirsten Dr Ing Knives for chipping wood
FR2235769A1 (en) * 1973-07-05 1975-01-31 Tech Bois Centre Rotary wood disintegrator - with arcuate cutter blades in axially extending peripheral circular grooves
DE3515305A1 (en) * 1985-04-27 1986-12-18 Reinhold W. Dr.-Ing. 5000 Köln Elsen Cutter-spindle cutting system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721930A1 (en) * 1977-05-14 1978-11-16 Hombak Maschinenfab Kg Flat set length wood chip cutting machine blades - are acute angled with alternating radially outward and inward cutting edges

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519597C1 (en) * 1995-05-29 1996-03-07 Reinhold W Dr Ing Elsen Angle=cut knife shaft with spiral knives to make wood chips

Also Published As

Publication number Publication date
ATE44679T1 (en) 1989-08-15
EP0261263A1 (en) 1988-03-30

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