EP0023616A1 - Throw-away reversible cutting blade for wood chippers - Google Patents

Throw-away reversible cutting blade for wood chippers Download PDF

Info

Publication number
EP0023616A1
EP0023616A1 EP80104053A EP80104053A EP0023616A1 EP 0023616 A1 EP0023616 A1 EP 0023616A1 EP 80104053 A EP80104053 A EP 80104053A EP 80104053 A EP80104053 A EP 80104053A EP 0023616 A1 EP0023616 A1 EP 0023616A1
Authority
EP
European Patent Office
Prior art keywords
knife
cutting
bends
holder
reversible
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Withdrawn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
EP80104053A
Other languages
German (de)
French (fr)
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
Application filed by Individual filed Critical Individual
Publication of EP0023616A1 publication Critical patent/EP0023616A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • B27G13/00—Cutter blocks; Other rotary cutting tools
    • B27G13/02—Cutter blocks; Other rotary cutting tools in the shape of long arbors, i.e. cylinder cutting blocks
    • B27G13/04—Securing the cutters by mechanical clamping means
    • 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 disposable reversible knife made of thin sheet metal for wood-cutting machines, which is provided with integrated scoring and with bends symmetrical to the turning axis in the interior of the knife.
  • Such a knife is e.g. according to DE-OS 27 03 739 known. It has recesses and bends in its interior, which are used to fix the knife in a holder. Although the bends have a limited effect on their respective effective range, stiffening in the longitudinal direction of the knife, the knife has the disadvantage that its cutting edges are unstable in the direction of the cutting stress and tend to flutter in a holder. This knife also has beads in the cutting area that form the scratches. However, the scratches interrupt the cutting edges of the knife, weaken it in the direction of the stresses of the cutting forces and, because of the double sheet thickness of the knife sheet, produce a relatively large amount of undesirable fine material at the expense of the amount of chips related to the knife length.
  • the knife known from DE-AS 22 14 434 also has a lack of insufficient rigidity, since its cutting edge is interrupted by notches or bends for scoring and is therefore weakened in the direction of the cutting forces. With the necessary free board of its cutting edge and the given clamping accuracy in a cutting machine, it tends to flutter, which results in poor chip quality and leads to premature wear of the cutting edge. The integrated scribers of this knife also shorten the effective cutting edge length, so that the undesirable proportion of fine material is increased.
  • the U-shaped or V-shaped scoring noses cannot be attached to the knife exactly in the direction of the cutting forces, there is an increased energy requirement for the cutting machine, and moreover, due to the attachment of the scoring device - the scoring noses are removed after sharpening the free area of the cutting edge - not be avoided that the forming stresses are released after hardening of the knife, whereby the cutting edge rejects, which brings about a further deterioration in the chip quality, which is indicated by a flatter Gaussian distribution curve over the chip thickness.
  • a knife is prevented from slipping in a holder by any suitable shape; however, the shapes shown do not influence the inherent rigidity of the knife in the direction of the cutting forces. This knife also tends to flutter.
  • a knife which is provided in its interior with bends transverse to the longitudinal axis of the knife, which serve as locking means in a holder and stiffen the knife along the bends in its interior, but it in Leave the direction of stress on the cutting forces in the cutting edge area, but especially unstable within the cutting edge sections between the bends. This knife also tends to flutter.
  • the invention has for its object to design a disposable reversible knife of the type mentioned in such a way that the cutting edge is stiffened in the direction of loading of the cutting forces and fluttering of the knife in a holder of the knife shaft of a wood-cutting machine is avoided.
  • the knife be curved in the shape of a shell, that the bends in planes parallel to the direction of the cutting forces the knife-edge run and are bent and deformed in these planes, arched axes, and that the bends are provided with scribing tips.
  • the turning knife 1 is curved in the shape of a shell over the sharpening plane 12 and has bends 2 which are symmetrical to the turning axis and provided with scoring tips 13 and which are bent and deformed about the curved axes 3.
  • the cutting edges 4, which are also symmetrical about the turning axis, are formed by the convex surface 6 and the ground surfaces in the sharpening plane 12.
  • the sharpening surface of this reversible knife is the chip discharge surface.
  • the wood to be cut is brought towards the convex surface 6 towards the cutting edges 4 at the required clearance angle in such a way that the respective bends 2 provided with the scribers 13 can penetrate into the wood surface. Since the bends 2 in the stiffening planes, in which the arched axes 3 lie, have the direction perpendicular to the wood fiber, which does not run perpendicular to the cutting edge 4 in the case of bevel cut knife shafts with hyperboloidal cutter heads, not only the proportion of fines is reduced to a minimum, but also that Drive energy requirement reduced.
  • the reversible knife is advantageously clamped in the knife holder 10 by means of a clamping plate 11 in that the edges 7 of the bends 2 are supported in slots 9 against stop faces 8, the knife board in the holder 10 being exactly determined.
  • additional aids such as guide grooves or mounting holes can be dispensed with.
  • the turning knife variant shown in FIG. 3 and tapering towards the cutting area in the knife plate thickness shows, for example, a knife plate cross section in which the design as a curved carrier of the same strength is approximated by the choice of the same radii for the boundary surfaces 5 and 6.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Details Of Cutting Devices (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Manufacture Of Wood Veneers (AREA)

Abstract

The cutting blade (1) is manufactured from thin sheet and has a shell-shaped curvature in the longitudinal direction. It is provided with bent-up portions (2) which extend in planes parallel to the direction in which the cutting forces act on the cutting edge (4) of the blade. These bent-up portions (2) are provided with scoring tips (13). <IMAGE>

Description

Die Erfindung betrifft ein Einweg-Wendemesser aus DUnnblech für Holzzerspanungsmaschinen, das mit integrierten Ritzern und mit zur Wendeachse symmetrischen Aufbiegungen im Innenbereich des Messers versehen ist.The invention relates to a disposable reversible knife made of thin sheet metal for wood-cutting machines, which is provided with integrated scoring and with bends symmetrical to the turning axis in the interior of the knife.

Ein derartiges Messer ist z.B. gemäß DE-OS 27 03 739 bekannt. Es hat Ausnehmungen und Aufbiegungen in seinem Innenbereich, die zur Fixierung des Messers in einer Halterung dienen. Obwohl die Aufbiegungen einen auf ihren jeweiligen Wirkungsbereich begrenzten, in Längsrichtung des Messers versteifenden Einfluß haben, hat das Messer den Nachteil, daß seine Schneidkanten in Richtung der Schnittbeanspruchung labil sind und in einer Halterung zum Flattern neigen. Außerdem besitzt dieses Messer im Schneidenbereich Sicken, die die Ritzer bilden. Die Ritzer unterbrechen aber die Schneidkanten des Messers, schwächen es in Beanspruchungsrichtung der Schnittkräfte und erzeugen wegen der doppelten Blechdicke des Messerblechs verhältnismäßig viel unerwünschtes Feingut zulasten der auf die Messerlänge bezogenen Spanmenge.Such a knife is e.g. according to DE-OS 27 03 739 known. It has recesses and bends in its interior, which are used to fix the knife in a holder. Although the bends have a limited effect on their respective effective range, stiffening in the longitudinal direction of the knife, the knife has the disadvantage that its cutting edges are unstable in the direction of the cutting stress and tend to flutter in a holder. This knife also has beads in the cutting area that form the scratches. However, the scratches interrupt the cutting edges of the knife, weaken it in the direction of the stresses of the cutting forces and, because of the double sheet thickness of the knife sheet, produce a relatively large amount of undesirable fine material at the expense of the amount of chips related to the knife length.

Auch das durch die DE-AS 22 14 434 bekannte Messer weist den Mangel ungenügender Steifigkeit auf, da seine Schneidkante durch Einkerbungen oder Ausbiegungen für die Ritzerbildung unterbrochen und dadurch in Beanspruchungsrichtung der Schnittkräfte geschwächt ist. Es tendiert bei dem notwendigen freien Vorstand seiner Schneidkante und der gegebenen Einspanngenauigkeit in einer Zerspanungsmaschine zum Flattern, was eine schlechte Spanqualität zur Folge hat und zu vorzeitigem Verschleiß der Schneidkante führt. Auch verkürzen die integrierten Ritzer dieses Messers die wirksame Schneidkantenlänge, so daß der unerwünschte Feingutanteil erhöht wird. Da überdies die U- oder V-förmigen Ritzernasen nicht exakt in Beanspruchungsrichtung der Schnittkräfte am Messer angebracht werden können, ergibt sich ein erhöhter Energiebedarf für die Zerspanungsmaschine, und außerdem kann durch die-,Anbringung der Ritzer bedingt - die Ritzernasen werden nach dem Scharfschleifen aus der Freifläche der Schneidkante herausgedrückt - nicht vermieden werden, daß die Umformspannungen nach dem Härten des Messers frei werden, wobei sich die Schneidkante verwirft, was eine weitere Verschlechterung der Spanqualität mit sich bringt, die durch eine flachere Gauß'sche Verteilungskurve über der Spandicke angezeigt wird.The knife known from DE-AS 22 14 434 also has a lack of insufficient rigidity, since its cutting edge is interrupted by notches or bends for scoring and is therefore weakened in the direction of the cutting forces. With the necessary free board of its cutting edge and the given clamping accuracy in a cutting machine, it tends to flutter, which results in poor chip quality and leads to premature wear of the cutting edge. The integrated scribers of this knife also shorten the effective cutting edge length, so that the undesirable proportion of fine material is increased. In addition, since the U-shaped or V-shaped scoring noses cannot be attached to the knife exactly in the direction of the cutting forces, there is an increased energy requirement for the cutting machine, and moreover, due to the attachment of the scoring device - the scoring noses are removed after sharpening the free area of the cutting edge - not be avoided that the forming stresses are released after hardening of the knife, whereby the cutting edge rejects, which brings about a further deterioration in the chip quality, which is indicated by a flatter Gaussian distribution curve over the chip thickness.

Die aufgeführten Nachteile eines Messers gemäß DE-OS 27 08 739 oder DE-AS 22 14 434 lassen sich auch dadurch nicht vermeiden, daß man ein Messer biegt, wie in der US-PS 1 520 068 in einem anderen Zusammenhang gezeigt wird, wobei das an sich ebene Messer zwischen Hohlflächen gespannt und vermittels einer Schraube derart geklemmt wird, daß vor dem Festklemmen im vorgespannten Zustand ein Einjustieren des Messers möglich wird. Besonders bei einem verhältnismäßig dünnen Wendemesser ist die Eigensteifigkeit hierdurch nicht gesichert, da die Gefahr besteht, daß das Messer infolge der Wirkung der Zentrifugalkräfte schon bei geringfügiger Lockerung der Halterung trotz der Einspannung verrutscht, weil der Reibschluß zwischen Messer und Anlageflächen nicht aufrechterhalten werden kann.The disadvantages of a knife according to DE-OS 27 08 739 or DE-AS 22 14 434 cannot be avoided by bending a knife, as is shown in a different context in US Pat. No. 1,520,068, the a flat knife is clamped between hollow surfaces and clamped by means of a screw in such a way that an adjustment of the knife is possible before clamping in the pretensioned state. Especially with a relatively thin turning knife, the inherent rigidity is not ensured because there is a risk that the knife will slip due to the effect of the centrifugal forces even with a slight loosening of the holder despite the clamping, because the frictional connection between the knife and the contact surfaces cannot be maintained.

Demgegenüber wird gemäß DE-OS 24 05 503 ein Messer durch beliebige, geeignete Formgebung am Verrutschen in einer Halterung gehindert; die aufgezeigten Formgebungen beeinflussen die Eigensteifigkeit des Messers jedoch nicht in Beanspruchungsrichtung der Schnittkräfte. Auch dieses Messer neigt daher zum Flattern.In contrast, according to DE-OS 24 05 503, a knife is prevented from slipping in a holder by any suitable shape; however, the shapes shown do not influence the inherent rigidity of the knife in the direction of the cutting forces. This knife also tends to flutter.

Weiterhin ist durch die DE-OS 24 05 465 ein Messer bekannt, das in seinem Innenbereich mit Aufbiegungen auch quer zur Längsachse des Messers versehen ist, welche als Arretierungsmittel in einer Halterung dienen und das Messer längs der Aufbiegungen in seinem Innenbereich versteifen, es jedoch in Beanspruchungsrichtung der Schnittkräfte im Schneidkantenbereich, besonders aber innerhalb der Schneidkantenabschnitte zwischen den Aufbiegungen labil belassen. Auch dieses Messer neigt daher zum Flattern.Furthermore, from DE-OS 24 05 465 a knife is known which is provided in its interior with bends transverse to the longitudinal axis of the knife, which serve as locking means in a holder and stiffen the knife along the bends in its interior, but it in Leave the direction of stress on the cutting forces in the cutting edge area, but especially unstable within the cutting edge sections between the bends. This knife also tends to flutter.

Der Erfindung liegt die Aufgabe zugrunde, ein Einweg-Wendemesser der eingangs genannten Art derart auszubilden, daß die Schneidkante in Beanspruchungsrichtung der Schnittkräfte versteift ist und ein Flattern des Messers in einer Halterung der Messerwelle einer Holzzerspanungsmaschine vermieden wird.The invention has for its object to design a disposable reversible knife of the type mentioned in such a way that the cutting edge is stiffened in the direction of loading of the cutting forces and fluttering of the knife in a holder of the knife shaft of a wood-cutting machine is avoided.

Zur Lösung dieser Aufgabe wird vorgeschlagen, daß das Messer der Länge nach schalenförmig gewölbt ist, daß die Aufbiegungen in Ebenen parallel zur Beansnruchungsrichtung der Schnittkräfte auf die Messerschneidkante verlaufen und um in diesen Ebenen,verwölbte Achsen gebogen und verformt sind, und daß die Aufbiegungen mit Ritzerspitzen versehen sind.To solve this problem, it is proposed that the knife be curved in the shape of a shell, that the bends in planes parallel to the direction of the cutting forces the knife-edge run and are bent and deformed in these planes, arched axes, and that the bends are provided with scribing tips.

Ein solches Messer hat den Vorteil, daß es aus einem verhältnismäßig dünnen Blech hergestellt werden kann, was zur Materialeinsparung und damit zur Herstellkosteneinsparung beiträgt, denn es zeichnet sich durch eine hohe Eigensteifigkeit in Beansnruchungsrichtung der Schnittkräfte aus, die durch die dopnelte Krümmung der Aufbiegungen um solche Achsen erreicht wird, die in der Ebene der Schnittkraftbeanspruchung liegen; die Verformungen um verwölbte Achsen bewirken in vorteilhafter Weise eine gegenseitige Versteifung der mit Ritzern ausgebildeten Aufbiegungen und der Schneidkanten, wodurch das Flattern des Messers in einer Halterung vermieden wird. Weiterhin weist dieses Wendemesser folgende Vorteile auf:

  • - die durchgehenden, von Ritzern nicht geschwächten, nicht unterbrochenen Schneidkanten bringen die volle Schnittleistung eines Vollschneidenmessers;
  • - die Dicke der Ritzerspitzen ist höchstens gleich der Messerblechdicke, gewährleistet die Minimierung des Feingutanteils des zerspanten Holzes und bewirkt die Verringerung der erforderlichen Antriebsenergie für die Holzzerspanungsmaschine;
  • - die bis auf den Scharfschliff anwendbaren spanlosen Fertigungsverfahren gewährleisten eine kostengünstige Herstellung des Messers;
  • - die Scharfschliffkosten werden aufgrund der wählbaren geringen Messerblechdicke minimiert.
Such a knife has the advantage that it can be made from a relatively thin sheet of metal, which contributes to material savings and thus to manufacturing cost savings, because it is characterized by a high degree of inherent rigidity in the direction of application of the cutting forces caused by the doubled curvature of the bends around such Axes are reached that lie in the plane of the cutting force; the deformations around arched axes advantageously bring about a mutual stiffening of the bends formed with scoring and the cutting edges, thereby avoiding the fluttering of the knife in a holder. This reversible knife also has the following advantages:
  • - The continuous cutting edges, not weakened by scratches, not interrupted bring the full cutting performance of a full cutting knife;
  • - The thickness of the scoring tips is at most equal to the thickness of the knife plate, ensures the minimization of the proportion of fines in the machined wood and reduces the drive energy required for the wood-cutting machine;
  • - The non-cutting manufacturing processes that can be used for sharpening ensure inexpensive manufacture of the knife;
  • - The sharpening costs are minimized due to the selectable thin knife plate thickness.

Bevorzugte Ausführungsbeispiele nach der Erfindung werden nachfolgend anhand der Zeichnung erläutert. Es zeigt:

  • Figur 1 ein Einweg-Wendemesser entlang Schnitt A-A gemäß Figur 2 in Seitenansicht,
  • Figur 2 die Draufsicht auf einen Abschnitt des Einweg-Wendemessers,
  • Figur 3 das Einweg-Wendemesser gemäß Figur 1 in Seitenansicht, jedoch mit einem Blechquerschnitt, bei dem die Blechdicke zum Schneidbereich hin abnimmt,
  • Figur 4 in Seitenansicht, wie das Einweg-Wendemesser in eine Messerhalterung eingebaut werden kann, und
  • Figur 5 die Draufsicht gemäß Figur 4.
Preferred embodiments according to the invention are explained below with reference to the drawing. It shows:
  • FIG. 1 shows a disposable reversible knife along section AA according to FIG. 2 in side view,
  • FIG. 2 shows the top view of a section of the disposable reversible knife,
  • FIG. 3 shows the disposable reversible knife according to FIG. 1 in a side view, but with a sheet cross-section in which the sheet thickness decreases towards the cutting area,
  • 4 shows a side view of how the disposable reversible knife can be installed in a knife holder, and
  • 5 shows the top view according to FIG. 4.

Das Wendemesser 1 ist über der Scharfschliffebene 12 seiner Länge nach schalenförmig gewölbt und hat zur Wendeachse symmetrische, mit Ritzerspitzen 13 versehene Aufbiegungen 2, welche um die verwölbten Achsen 3 aufgebogen und verformt sind. Die ebenfalls zur Wendeachse symmetrischen Schneidkanten 4 werden von der konvexen Oberfläche 6 und den angeschliffenen Flächen in der Scharfschliffebene 12 gebildet. Im Gegensatz zum üblichen flachen Messer ist bei diesem Wendemesser die Scharfschlifffläche die Spanablauffläche.The turning knife 1 is curved in the shape of a shell over the sharpening plane 12 and has bends 2 which are symmetrical to the turning axis and provided with scoring tips 13 and which are bent and deformed about the curved axes 3. The cutting edges 4, which are also symmetrical about the turning axis, are formed by the convex surface 6 and the ground surfaces in the sharpening plane 12. In contrast to the usual flat knife, the sharpening surface of this reversible knife is the chip discharge surface.

Das zu zerspanende Holz wird zur konvexen Oberfläche 6 hin unter dem erforderlichen Freiwinkel so an die Schneidkanten 4 herangeführt, daß die mit den Ritzern 13 versehenen, jeweils zugehörigen Aufbiegungen 2 in die Holzoberfläche eindringen können. Da die Aufbiegungen 2 in den Versteifungsebenen, in denen die verwölbten Achsen 3 liegen, die Richtung senkrecht zur Holzfaser haben, die bei Schrägschnittmesserwellen mit hyperboloidischen Messerköpfen nicht senkrecht zur Schneidkante 4 verläuft, so wird nicht nur der Feingutanteil auf ein Minimum reduziert, sondern auch der Antriebsenergiebedarf vermindert.The wood to be cut is brought towards the convex surface 6 towards the cutting edges 4 at the required clearance angle in such a way that the respective bends 2 provided with the scribers 13 can penetrate into the wood surface. Since the bends 2 in the stiffening planes, in which the arched axes 3 lie, have the direction perpendicular to the wood fiber, which does not run perpendicular to the cutting edge 4 in the case of bevel cut knife shafts with hyperboloidal cutter heads, not only the proportion of fines is reduced to a minimum, but also that Drive energy requirement reduced.

Das Wendemesser ist in der Messerhalterung 10 mittels Klemmplatte 11 insofern vorteilhaft eingespannt, als die Kanten 7 der Aufbiegungen 2 in Schlitzen 9 gegen Anschlagflächen 8 abgestützt werden, wobei der Messervorstand in der Halterung 10 exakt bestimmt ist. Somit kann auf zusätzliche Hilfsmittel wie Führungsnuten oder Befestigungslöcher verzichtet werden.The reversible knife is advantageously clamped in the knife holder 10 by means of a clamping plate 11 in that the edges 7 of the bends 2 are supported in slots 9 against stop faces 8, the knife board in the holder 10 being exactly determined. This means that additional aids such as guide grooves or mounting holes can be dispensed with.

Außerdem ist von wenn die Eigensteifigkeit des Wendemessers dazu genutzt wird, zusätzliches Material und damit Materialkosten einzusparen, indem man einen Messerblechcuerschnitt wählt, der einem gebogenen Träger gleicher Festigkeit entspricht. Die in Figur 3 dargestellte, mit zum Schneidbereich hin in der Messerblechdicke verjüngte Wendemesservariante zeigt beispielsweise einen Messerblechquerschnitt, bei dem die Ausbildung als gebogener Träger gleicher Festigkeit durch die Wahl gleicher Radien für die Begrenzungsflächen 5 und 6 angenähert ist.In addition, if the inherent rigidity of the reversible knife is used to save additional material and thus material costs, by choosing a knife sheet cross-section that corresponds to a curved support of the same strength. The turning knife variant shown in FIG. 3 and tapering towards the cutting area in the knife plate thickness shows, for example, a knife plate cross section in which the design as a curved carrier of the same strength is approximated by the choice of the same radii for the boundary surfaces 5 and 6.

Claims (4)

1. Einweg-Wendemesser aus Dünnblech für Holzzerspanungsmaschinen, das mit integrierten Ritzern und mit zur Wendeachse symmetrischen Aufbiegungen im Innenbereich des Messers versehen ist, dadurch gekennzeichnet, daß das Messer (1) der Länge nach schalenförmig gewölbt ist, daß die Aufbiegungen (2) in Ebenen parallel zur Beanspruchungsrichtung der Schnittkräfte auf die Messerschneidkante (4) verlaufen und um in diesen Ebenen verwölbte Achsen (3) gebogen und verformt sind, und daß die Aufbiegungen (2) mit Ritzerspitzen (13) versehen sind.1. Disposable reversible knife made of thin sheet metal for wood-cutting machines, which is provided with integrated scoring and with symmetrical bends in the interior of the knife, characterized in that the knife (1) is curved in the form of a bowl, that the bends (2) in Layers run parallel to the direction of stress of the cutting forces on the knife cutting edge (4) and are bent and deformed about axes (3) arched in these planes, and that the bends (2) are provided with scribing tips (13). 2. Einweg-Wendemesser nach Anspruch 1, dadurch gekennzeichnet, daß die Blechdicke des Messers (1) zum Schneidbereich hin abnimmt.2. Disposable reversible knife according to claim 1, characterized in that the sheet thickness of the knife (1) decreases towards the cutting area. 3. Einweg-Wendemesser nach Anspruch 2, dadurch gekennzeichnet, daß die Blechdicke des Messers (1) zum Schneidbereich hin derart abnimmt, daß die Radien der Begrenzungsflächen auf der konkaven (5) und konvexen (6) Seite des Messers (1) gleich groß sind.3. Disposable reversible knife according to claim 2, characterized in that the sheet thickness of the knife (1) decreases towards the cutting area such that the radii of the boundary surfaces on the concave (5) and convex (6) side of the knife (1) are the same size are. 4. Einweg-Wendemesser nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kanten (7) der Aufbiegungen (2) als Anschlagkanten für die Messeraufnahme in einer Messerhalterung (10) ausgebildet sind und sich gegen Anlageflächen (8) in den Schlitzen (9) der Messerhalterung (10) abstützen.4. Disposable reversible knife according to claim 1 or 2, characterized in that the edges (7) of the bends (2) are designed as stop edges for the knife holder in a knife holder (10) and against contact surfaces (8) in the slots (9 ) support the knife holder (10).
EP80104053A 1979-07-18 1980-07-14 Throw-away reversible cutting blade for wood chippers Withdrawn EP0023616A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792929020 DE2929020C2 (en) 1979-07-18 1979-07-18 Disposable reversible knives for wood chipping machines
DE2929020 1979-07-18

Publications (1)

Publication Number Publication Date
EP0023616A1 true EP0023616A1 (en) 1981-02-11

Family

ID=6076044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104053A Withdrawn EP0023616A1 (en) 1979-07-18 1980-07-14 Throw-away reversible cutting blade for wood chippers

Country Status (2)

Country Link
EP (1) EP0023616A1 (en)
DE (1) DE2929020C2 (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191423638A (en) * 1914-12-07 1915-05-27 Norman Edward Noble Improved Rotary Cutter Block suitable for Planning Machines.
DE575072C (en) * 1933-04-25 Hugo Hisserich Jr Double-edged wolf knives
US2221458A (en) * 1938-09-16 1940-11-12 Elmer P Sacrey Cutter head
DE845561C (en) * 1949-09-24 1952-08-04 Rudolf Dipl-Ing Stahl Spiral knife shaft for wood planing machines
DE885149C (en) * 1950-02-11 1953-08-03 Ludwin Oppold Wood cutter
CH346999A (en) * 1958-05-13 1960-06-15 Schlaeppi Louis Portable planer
US3356114A (en) * 1967-12-05 Chipper head and blade
US3817305A (en) * 1972-10-19 1974-06-18 Ferguson I Cutter tip
FR2235769A1 (en) * 1973-07-05 1975-01-31 Tech Bois Centre Rotary wood disintegrator - with arcuate cutter blades in axially extending peripheral circular grooves
DE2405470A1 (en) * 1974-02-05 1975-08-07 Oppold Ludwin Cutting blade for plastics or wood - comprising undulating section esp of thin low quality sheet clamped in a holder
DE2730802B1 (en) * 1977-07-07 1979-01-04 Vereinigte Edelstahlwerke Ag (Vew), Wien Disposable knives for wood cutting machines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1520068A (en) * 1923-03-19 1924-12-23 Mitts & Merrill Knife-clamping device
DE2214434C3 (en) * 1972-03-24 1981-05-07 Vereinigte Edelstahlwerke Ag (Vew), Wien Steel strip knives for wood chipping machines and process for making the same
DE2405508A1 (en) * 1974-02-05 1975-08-07 Ludwin Oppold KNIFE HEAD FOR WOOD AND PLASTIC PROCESSING
DE2708739C3 (en) * 1977-03-01 1980-07-31 Vereinigte Edelstahlwerke Ag (Vew), Wien Steel strip knives for wood cutting machines

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575072C (en) * 1933-04-25 Hugo Hisserich Jr Double-edged wolf knives
US3356114A (en) * 1967-12-05 Chipper head and blade
GB191423638A (en) * 1914-12-07 1915-05-27 Norman Edward Noble Improved Rotary Cutter Block suitable for Planning Machines.
US2221458A (en) * 1938-09-16 1940-11-12 Elmer P Sacrey Cutter head
DE845561C (en) * 1949-09-24 1952-08-04 Rudolf Dipl-Ing Stahl Spiral knife shaft for wood planing machines
DE885149C (en) * 1950-02-11 1953-08-03 Ludwin Oppold Wood cutter
CH346999A (en) * 1958-05-13 1960-06-15 Schlaeppi Louis Portable planer
US3817305A (en) * 1972-10-19 1974-06-18 Ferguson I Cutter tip
FR2235769A1 (en) * 1973-07-05 1975-01-31 Tech Bois Centre Rotary wood disintegrator - with arcuate cutter blades in axially extending peripheral circular grooves
DE2405470A1 (en) * 1974-02-05 1975-08-07 Oppold Ludwin Cutting blade for plastics or wood - comprising undulating section esp of thin low quality sheet clamped in a holder
DE2730802B1 (en) * 1977-07-07 1979-01-04 Vereinigte Edelstahlwerke Ag (Vew), Wien Disposable knives for wood cutting machines

Also Published As

Publication number Publication date
DE2929020C2 (en) 1981-08-27
DE2929020B1 (en) 1980-12-18

Similar Documents

Publication Publication Date Title
EP0278083B1 (en) Cutting tool for metal cutting
DE69023038T3 (en) Cutting insert for a milling cutter.
DE69907336T2 (en) cutting wheel
DE3211766A1 (en) SLOT CUTTER
AT398403B (en) KNIFE ROLLER AND COMB KNIFE FOR KNIFE SHAFT CUTTER
AT390222B (en) ROTATING INTERNAL KNIFE FOR ELECTRICAL SHAVERS AND METHOD FOR THE PRODUCTION THEREOF
DE69819476T2 (en) ROTATION PUNCH TOOL
EP0099995A2 (en) Single cutting blade reamer
DE2730352C2 (en)
EP0977654B1 (en) Hand planer
DE19741089A1 (en) Cutting and splitting tool
EP0631834A1 (en) Insert for reamer
DE3114687A1 (en) Cutting blade
EP0099004B1 (en) Cutting die, in particular for contour-cutting, and a method of manufacturing it
EP0023616A1 (en) Throw-away reversible cutting blade for wood chippers
DE2214434C3 (en) Steel strip knives for wood chipping machines and process for making the same
DE2708739C3 (en) Steel strip knives for wood cutting machines
EP0268152B1 (en) Internal diameter cutting wheel
DE60119743T2 (en) KNIVES AND KNIFE HOLDERS FOR A CUTTER
DE2521938B2 (en) Twist drill
DE4341503A1 (en) Device for finishing bores
DE2444448A1 (en) PROCEDURE FOR SAWING A WORKPIECE AND SAW BLADE FOR CARRYING OUT THE PROCESS
DE3009813C2 (en) Scoring bar for installation in a knife shaft of a wood cutting machine
EP0085040A2 (en) Tool spindle for the manufacture of flat wood chips
DE2952710A1 (en) Wood chipping machine grindable blade - has slitters individually form locked in groove along base unit

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE FR IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820125