EP0265622B1 - Cutter block - Google Patents

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Publication number
EP0265622B1
EP0265622B1 EP87112395A EP87112395A EP0265622B1 EP 0265622 B1 EP0265622 B1 EP 0265622B1 EP 87112395 A EP87112395 A EP 87112395A EP 87112395 A EP87112395 A EP 87112395A EP 0265622 B1 EP0265622 B1 EP 0265622B1
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EP
European Patent Office
Prior art keywords
groove
cutter
knife
block according
cutter block
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
EP87112395A
Other languages
German (de)
French (fr)
Other versions
EP0265622A2 (en
EP0265622A3 (en
Inventor
Dieter Krautzberger
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.)
Oertli Werkzeuge AG
Original Assignee
Oertli Werkzeuge AG
Babcock BSH AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19863636618 external-priority patent/DE3636618A1/en
Application filed by Oertli Werkzeuge AG, Babcock BSH AG filed Critical Oertli Werkzeuge AG
Priority to AT87112395T priority Critical patent/ATE90017T1/en
Publication of EP0265622A2 publication Critical patent/EP0265622A2/en
Publication of EP0265622A3 publication Critical patent/EP0265622A3/en
Application granted granted Critical
Publication of EP0265622B1 publication Critical patent/EP0265622B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1934—Rotary cutting tool including holder [i.e., head] having seat for inserted tool with separate means to fasten tool to holder
    • Y10T407/1938—Wedge clamp element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1942—Peripherally spaced tools

Definitions

  • the invention relates to a knife shaft for a planer according to the preamble of patent claim 1.
  • the self-locking centrifugal wedge lies in the direction of flight behind the knife directly on the knife.
  • the profiling of the knife positively engages in a corresponding profiling of the side wall of the groove.
  • This lamellar structure is subject to inaccuracies due to tolerances, which are exacerbated by reduced bending stiffness and recurring unbalance problems. Depending on the type of wood to be processed, they can affect the surface quality of the workpiece. This limits the scope.
  • Another disadvantage of the lamella structure is the risk of crevice corrosion. Due to the arrangement of the centrifugal wedge behind the knife, the critical cross-section behind the centrifugal wedge is very narrow and therefore tends to so-called bending or rearing up.
  • Wood cutting machines started using cheap disposable knives several years ago to avoid the time-consuming regrinding of the knives. From DE-OS 25 59 406 it is also known to use profiled disposable knives which engage in a form-fitting manner in tongue and groove connection in correspondingly profiled counter surfaces and are more precisely fixable and easier to replace compared to the previously known perforated disposable knives .
  • the centrifugal wedge rests with one clamping surface on a side wall of the groove and with the other wedge surface on the retaining strip.
  • the centrifugal wedge whose wedge angle is obviously far outside the self-locking range, is pushed outwards by a spring.
  • the holding strip is displaceable in the transverse direction relative to the shaft body in order to enable the knife to be changed - in one exemplary embodiment under spring pressure.
  • Various auxiliary devices are obviously required to change the knife and to adjust the new knife. Since the position of the knife depends on the exact fit of several interlocking parts, tolerance-related inaccuracies can add up. Such inevitable inaccuracies may be portable in cutting machines for which the knives are intended according to DE-OS 25 59 406. However, planer machines place far higher demands on accuracy.
  • DE-OS 34 12 251 relates to a knife holder for the knife shaft of a wood cutting machine, in which axially parallel, narrowing towards the lateral surface grooves with radially inner groove base each a knife clamped by a centrifugal wedge sits. This is connected by screws with two slotted perforated plates and a pressure bar to form an assembly. In the operating state, a clamping strip sits between the pressure strip and the centrifugal wedge, which, together with two clamping strip springs and a clamping strip foot screwed to the base of the groove, forms a second assembly.
  • the pressure bar and the clamping bar are provided with interlocking profiles.
  • the two clamping bar springs spring up, which opens the play-free connection between the pressure bar and the clamping bar to such an extent that the assembly to which the knife belongs can be removed radially.
  • the invention has for its object to provide a knife shaft according to the preamble of claim 1, which is easy to manufacture while maintaining the form-fitting holder of the disposable knife.
  • the retaining strip is arranged at such a distance from the side wall of the groove that, when the centrifugal wedge is released, an intermediate knife can be easily pulled out in the longitudinal direction and a new knife can be inserted practically without play.
  • the centrifugal wedge When the centrifugal wedge generates the clamping force by rotation, the retaining strip is pressed against the disposable knife by slight elastic deformation, so that it is immovably fixed.
  • the disposable knife is in direct contact with the solid shaft body. This ensures a tight fit.
  • the back of the knife rests on the groove wall; this makes the critical cross-section behind the knife stiffer against so-called bending or rearing up.
  • the feature of claim 5 ensures that the retaining bar remains immovable in the long run.
  • the feature of claim 6 prevents the attachment from loosening at a standstill. This eliminates the need for additional tensioning elements, such as springs or the like.
  • the feature of claim 7 enables the centrifugal wedge to be pretensioned in the idle state.
  • the clamping force can be reduced if necessary.
  • the drawing serves to explain the invention on the basis of two simplified exemplary embodiments.
  • the performance examples each show a partial cross section of the knife shaft according to the invention.
  • a shaft body 1 made of solid material several axially parallel grooves 2 narrowing towards the outer surface are provided at uniform angular intervals.
  • One side wall 3 of the groove 2 includes an angle ⁇ of approximately 30 ° with the associated radius.
  • the side wall 3 is referred to in the following as “rear side wall” because it lies at the rear, in relation to the direction of flight symbolized by the arrow A.
  • the other side wall 4, the "front side wall” is radial or approximately radial.
  • the bottom of the groove consists of two strips 5, 6 of approximately equal width which are offset from one another in steps, each of which forms a right angle with the adjacent side wall 3 or 4 of the groove 2.
  • the skirting board 7 is immovable on the strip 5 of the groove base lying at right angles to the rear side wall 3 screwed tight.
  • the screws 9 are secured by adhesive.
  • the baseboard 7 is only as wide as is necessary for the attachment of the screws 9. It is relatively thick; their thickness corresponds to about half the width. It is therefore practically non-deformable.
  • the holding strip 8 is plane-parallel to the rear side wall 3 and extends over its full height to the outer surface of the shaft body 1. It is much wider than the baseboard 7 and about half as thick. It is therefore elastically deformable under the action of a strong force, although the bending stiffness is quite high.
  • a disposable knife 10 is clamped, which is designed in the usual way as a reversible knife with two cutting edges 11, 12.
  • One cutting edge 11 protrudes a little from the cylindrical outer surface of the shaft body 1.
  • the disposable knife 10 has a groove 13 on the side which bears against the retaining strip 8.
  • the surface of the retaining strip 8 facing the knife is provided with a tongue 14, the width of which corresponds exactly to the groove 13, so that the tongue 14 fits positively into the Groove 13 engages.
  • the back of the disposable knife 10 lying directly against the rear side wall 3 is completely flat.
  • a centrifugal wedge 15 with the clamping surfaces 16, 17 is suitably seated.
  • the clamping surface 16 is wide and therefore lies against the front side wall 4 almost at its entire height.
  • the other clamping surface 17 is narrow and only lies directly opposite the disposable knife 10 on the front of the retaining strip 8.
  • the shortening of the clamping surface 17 is brought about by two arcuate recesses 18, 19 arranged at a corner.
  • the one recess 18, which adjoins the bevelled narrow end face 20 of the retaining strip 8, forms a chip pocket in front of the cutting edge 11.
  • the other recess 19 is necessary considering screws 9.
  • relatively narrow webs 21 and 22 run.
  • the outer web 21 is in tension State almost flush with the lateral surface of the shaft body 1.
  • the inner web 22 lies plane-parallel above the strip 6 of the groove base at a short distance.
  • the centrifugal wedge 15 can be made of steel, but also of light metal if a reduced clamping force is desired.
  • the centrifugal wedge 15 is first released by applying force against the web 21.
  • the retaining strip 8 which is slightly deformed in the tensioned state in the direction of the disposable knife 10, returns to its relaxed position.
  • centrifugal wedge 15 is designed to be self-locking, it remains in the tensioned state even after the knife shaft has stopped.
  • the clamping surface of the centrifugal wedge 25, which faces the front side wall 4 of the groove 2 is provided in the middle with a wide longitudinal groove 26, so that only the edge zones 27, 28 abut.
  • the centrifugal wedge 25 there are several radial adjusting screws 29 distributed over the length, which are supported on the bottom of the groove. With the help of the set screws 29, a certain preload can be generated even in the idle state.
  • FIG. 2 is the same as the exemplary embodiment shown in FIG. 1 except for minor structural deviations.
  • One of these deviations is that the lateral mating surfaces of the tongue and groove connection between the disposable knife and the retaining strip are chamfered.

Description

Die Erfindung betrifft eine Messerwelle für eine Hobelmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a knife shaft for a planer according to the preamble of patent claim 1.

Gemäß EP-A1-0 117 991, von der die Erfindung ausgeht, liegt der selbsthemmende Fliehkeil - in Flugrichtung hinter dem Messer - unmittelbar an dem Messer an. Die Profilierung des Messers greift formschlüssig in eine entsprechende Profilierung der Seitenwand der Nut ein. Bei dieser Messerwelle läßt sich das Messer nach Lösen des Fliehkeils von einer Stirnseite her in Längsrichtung aus der Nut herausziehen oder in diese hineinschieben. Die Justierung erfolgt selbsttätig durch das Ineinandergreifen der profilierten Flächen. Dadurch ist der Messerwechsel sehr einfach und kann durch ungeschultes Personal in kurzer Zeit durchgeführt werden. Diese Vorteile werden aber durch einen Nachteil erkauft: Leider ist die Form der Nut so kompliziert, daß es nicht möglich ist, den Wellenkörper aus einem Stück herzustellen. Daher ist der Wellenkörper aus gestanzten Blechen aufgebaut, die auf einem axialen Rohr aufgereiht und zwischen zwei Endplatten verspannt sind.According to EP-A1-0 117 991, from which the invention is based, the self-locking centrifugal wedge lies in the direction of flight behind the knife directly on the knife. The profiling of the knife positively engages in a corresponding profiling of the side wall of the groove. With this knife shaft, the knife can be pulled out or pushed into the groove from one end in the longitudinal direction after loosening the centrifugal wedge. The adjustment is carried out automatically by the interlocking of the profiled surfaces. This makes knife changing very easy and can be carried out by untrained personnel in a short time. However, these advantages are paid for by a disadvantage: Unfortunately, the shape of the groove is so complicated that it is not possible to manufacture the shaft body from one piece. The shaft body is therefore made up of stamped metal sheets, which are lined up on an axial tube and clamped between two end plates.

Dieser Lamellenaufbau ist mit toleranzbedingten Ungenauigkeiten behaftet, die durch verringerte Biegesteifigkeit und durch wiederkehrende Unwuchtprobleme noch verschärft werden. Sie können je nach der zu bearbeitenden Holzart die Oberflächenqualität des Werkstücks beeinträchtigen. Dadurch ist der Anwendungsbereich eingeschränkt. Ein weiterer Nachteil des Lamellenaufbaus ist die Gefahr der Spaltkorrosion. Bedingt durch die Anordnung des Fliehkeils hinter dem Messer ist der kritische Querschnitt hinter dem Fliehkeil sehr schmal und neigt daher zum sogenannten Aufbiegen oder Aufbäumen.This lamellar structure is subject to inaccuracies due to tolerances, which are exacerbated by reduced bending stiffness and recurring unbalance problems. Depending on the type of wood to be processed, they can affect the surface quality of the workpiece. This limits the scope. Another disadvantage of the lamella structure is the risk of crevice corrosion. Due to the arrangement of the centrifugal wedge behind the knife, the critical cross-section behind the centrifugal wedge is very narrow and therefore tends to so-called bending or rearing up.

Bei Holzzerspanungsmaschinen hat man schon vor etlichen Jahren begonnen, billige Einwegmesser einzusetzen, um das zeitraubende Nachschleifen der Messer zu vermeiden. Durch die DE-OS 25 59 406 ist es auch schon bekannt, profilierte Einwegmesser zu verwenden, die nach Art einer Nut- und Federverbindung formschlüssig in entsprechend profilierte Gegenflächen eingreifen und im Vergleich zu den schon früher bekannten, gelochten Einwegmessern exakter fixierbar und leichter austauschbar sind.Wood cutting machines started using cheap disposable knives several years ago to avoid the time-consuming regrinding of the knives. From DE-OS 25 59 406 it is also known to use profiled disposable knives which engage in a form-fitting manner in tongue and groove connection in correspondingly profiled counter surfaces and are more precisely fixable and easier to replace compared to the previously known perforated disposable knives .

Gemäß der angegebenen DE-OS liegt der Fliehkeil mit der einen Spannfläche an einer Seitenwand der Nut an, mit der anderen Keilfläche an der Halteleiste. Auf der Rückseite des Einwegmessers ist eine Klemmleiste angebracht, die formschlüssig an der anderen Seitenwand der Nut anliegt. Der Fliehkeil, dessen Keilwinkel offensichtlich weit außerhalb des Selbsthemmungsbereichs liegt, wird durch eine Feder nach außen gedrückt.According to the specified DE-OS, the centrifugal wedge rests with one clamping surface on a side wall of the groove and with the other wedge surface on the retaining strip. On the back of the disposable knife there is a clamping strip, which fits positively on the other side wall of the groove. The centrifugal wedge, whose wedge angle is obviously far outside the self-locking range, is pushed outwards by a spring.

Die Halteleiste ist zur Ermöglichung des Messerwechsels relativ zum Wellenkörper in Querrichtung - bei einem Ausführungsbeispiel unter Federdruck - verschieblich. Zum Messerwechsel und zur Justierung des neuen Messers sind offenbar verschiedene Hilfsvorrichtungen erforderlich. Da die Lage des Messers von der exakten Passung mehrerer ineinandergreifender Teile abhängt, können sich toleranzbedingte Ungenauigkeiten addieren. Derartige unvermeidliche Ungenauigkeiten sind möglicherweise bei Zerspanungsmaschinen, für die die Messer gemäß DE-OS 25 59 406 bestimmt sind, tragbar. Bei Hobelmaschinen werden jedoch weit höhere Anforderungen an die Genauigkeit gestellt.The holding strip is displaceable in the transverse direction relative to the shaft body in order to enable the knife to be changed - in one exemplary embodiment under spring pressure. Various auxiliary devices are obviously required to change the knife and to adjust the new knife. Since the position of the knife depends on the exact fit of several interlocking parts, tolerance-related inaccuracies can add up. Such inevitable inaccuracies may be portable in cutting machines for which the knives are intended according to DE-OS 25 59 406. However, planer machines place far higher demands on accuracy.

Die DE-OS 34 12 251 betrifft eine Messerhalterung für die Messerwelle einer Holzzerspan ungsmaschine, bei der in achsparallelen, sich zur Mantelfläche hin verengenden Nuten mit radial innenliegendem Nutengrund je ein durch einen Fliehkeil verspanntes Messer sitzt. Dieses ist durch Schrauben mit zwei Langlochblechen und mit einer Druckleiste zu einer Baugruppe verbunden. Zwischen Druckleiste und Fliehkeil sitzt im Betriebszustand eine Klemmleiste, die zusammen mit zwei Klemmleistenfedern und einem am Nutengrund angeschraubten Klemmleistenfuß eine zweite Baugruppe bildet. Druckleiste und Klemmleiste sind mit formschlüssig ineinandergreifenden Profilierungen versehen. Preßt man den Fliehkeil gegen ein Federpaket radial nach innen, so federn die beiden Klemmleistenfedern auf, wodurch sich die spiel freie Verbindung zwischen Druckleiste und Klemmleiste soweit öffnet, daß die Baugruppe, zu der das Messer gehört, radial entnommen werden kann.DE-OS 34 12 251 relates to a knife holder for the knife shaft of a wood cutting machine, in which axially parallel, narrowing towards the lateral surface grooves with radially inner groove base each a knife clamped by a centrifugal wedge sits. This is connected by screws with two slotted perforated plates and a pressure bar to form an assembly. In the operating state, a clamping strip sits between the pressure strip and the centrifugal wedge, which, together with two clamping strip springs and a clamping strip foot screwed to the base of the groove, forms a second assembly. The pressure bar and the clamping bar are provided with interlocking profiles. If one presses the centrifugal wedge radially inwards against a spring assembly, the two clamping bar springs spring up, which opens the play-free connection between the pressure bar and the clamping bar to such an extent that the assembly to which the knife belongs can be removed radially.

Der Erfindung liegt die Aufgabe zugrunde, eine Messerwelle gemäß dem Oberbegriff des Patentanspruchs 1 zu schaffen, die unter Beibehaltung der formschlüssigen Halterung des Einwegmessers einfach herstellbar ist.The invention has for its object to provide a knife shaft according to the preamble of claim 1, which is easy to manufacture while maintaining the form-fitting holder of the disposable knife.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst. Die Halteleiste ist in einem solchen Abstand von der Seitenwand der Nut angeordnet, daß bei gelöstem Fliehkeil ein dazwischenliegendes Messer leicht in Längsrichtung herausgezogen und ein neues Messer praktisch spielfrei eingeschoben werden kann. Wenn der Fliehkeil durch Rotation die Spannkraft erzeugt, wird die Halteleiste durch geringe elastische Verformung fest an das Einwegmesser angepreßt, so daß dieses unverrückbar festliegt.This object is achieved by the features specified in the characterizing part of claim 1. The retaining strip is arranged at such a distance from the side wall of the groove that, when the centrifugal wedge is released, an intermediate knife can be easily pulled out in the longitudinal direction and a new knife can be inserted practically without play. When the centrifugal wedge generates the clamping force by rotation, the retaining strip is pressed against the disposable knife by slight elastic deformation, so that it is immovably fixed.

Gemäß Anspruch 2 ist das Einwegmesser unmittelbar in Kontakt mit dem massiven Wellenkörper. Dadurch wird ein fester Sitz erreicht.According to claim 2, the disposable knife is in direct contact with the solid shaft body. This ensures a tight fit.

Bei der bevorzugten Anordnung gemäß Anspruch 3 liegt die Rückseite des Messers an der Nutenwand an; dadurch wird der kritische Querschnitt hinter dem Messer steifer gegen das sogenannte Aufbiegen oder Aufbäumen.In the preferred arrangement according to claim 3, the back of the knife rests on the groove wall; this makes the critical cross-section behind the knife stiffer against so-called bending or rearing up.

Eine zweckmäßige konstruktive Ausbildung ist in Anspruch 4 angegeben.A useful constructive training is given in claim 4.

Durch das Merkmal des Anspruchs 5 wird gewährleistet, daß die Halteleiste auf Dauer unverrückbar bleibt.The feature of claim 5 ensures that the retaining bar remains immovable in the long run.

Durch das Merkmal des Anspruchs 6 wird vermieden, daß sich die Befestigung im Stillstand lockert. Dadurch erübrigen sich zusätzliche Spannelemente, wie Federn oder dergleichen.The feature of claim 6 prevents the attachment from loosening at a standstill. This eliminates the need for additional tensioning elements, such as springs or the like.

Das Merkmal des Anspruchs 7 ermöglicht ein Vorspannen des Fliehkeils im Ruhezustand.The feature of claim 7 enables the centrifugal wedge to be pretensioned in the idle state.

Durch das Merkmal des Anspruchs 8 kann die Spannkraft bei Bedarf verkleinert werden.Due to the feature of claim 8, the clamping force can be reduced if necessary.

Die Zeichnung dient zur Erläuterung der Erfindung anhand von zwei vereinfacht dargestellten Ausführungsbeispielen. Die Auführungsbeispiele zeigen je einen Teilquerschnitt der erfindungsgemäßen Messerwelle.The drawing serves to explain the invention on the basis of two simplified exemplary embodiments. The performance examples each show a partial cross section of the knife shaft according to the invention.

In der zylindrischen Mantelfläche eines aus massivem Material gearbeiteten Wellenkörpers 1 sind in gleichmäßigen Winkelabständen mehrere achsenparallele, sich zur Mantelfläche hin verengende Nuten 2 angebracht. Die eine Seitenwand 3 der Nut 2 schließt mit dem zugehörigen Radius einen Winkel α von ungefähr 30° ein. Die Seitenwand 3 wird im folgenden der Einfachheit halber "hintere Seitenwand" bezeichnet, weil sie - bezogen auf die durch den Pfeil A symbolisierte Flugrichtung - hinten liegt. Die andere Seitenwand 4, die "vordere Seitenwand" liegt radial oder annähernd radial. Der Nutengrund besteht aus zwei stufenartig zueinander versetzten, annähernd gleich breiten Streifen 5, 6, von denen jeder mit der angrenzenden Seitenwand 3 bzw. 4 der Nut 2 einen rechten Winkel bildet.In the cylindrical outer surface of a shaft body 1 made of solid material, several axially parallel grooves 2 narrowing towards the outer surface are provided at uniform angular intervals. One side wall 3 of the groove 2 includes an angle α of approximately 30 ° with the associated radius. For the sake of simplicity, the side wall 3 is referred to in the following as "rear side wall" because it lies at the rear, in relation to the direction of flight symbolized by the arrow A. The other side wall 4, the "front side wall" is radial or approximately radial. The bottom of the groove consists of two strips 5, 6 of approximately equal width which are offset from one another in steps, each of which forms a right angle with the adjacent side wall 3 or 4 of the groove 2.

In der Nut 2 sitzt auf der ganzen Länge ein mit exakt geschliffenen Anlageflächen versehenes, im Querschnitt L-förmiges Profileisen, bestehend aus einer Fußleiste 7 und einer Halteleiste 8. Die Fußleiste 7 ist unverrückbar an dem rechtwinklig zur hinteren Seitenwand 3 liegenden Streifen 5 des Nutengrundes festgeschraubt. Die Schrauben 9 sind durch Klebstoff gesichert. Die Fußleiste 7 ist nur so breit, wie es für die Anbringung der Schrauben 9 erforderlich ist. Sie ist relativ dick; ihre Dicke entspricht etwa der halben Breite. Sie ist daher praktisch unverformbar. Die Halteleiste 8 liegt planparallel zur hinteren Seitenwand 3 und ragt über deren volle Höhe bis an die Mantelfläche des Wellenkörpers 1 heran. Sie ist wesentlich breiter als die Fußleiste 7 und etwa halb so dick. So ist daher unter der Einwirkung einer starken Kraft elastisch verformbar, obwohl die Biegesteifigkeit ziemlich groß ist.In the groove 2 sits along the entire length with an exactly ground contact surface, in cross-section L-shaped profile iron, consisting of a skirting board 7 and a retaining strip 8. The skirting board 7 is immovable on the strip 5 of the groove base lying at right angles to the rear side wall 3 screwed tight. The screws 9 are secured by adhesive. The baseboard 7 is only as wide as is necessary for the attachment of the screws 9. It is relatively thick; their thickness corresponds to about half the width. It is therefore practically non-deformable. The holding strip 8 is plane-parallel to the rear side wall 3 and extends over its full height to the outer surface of the shaft body 1. It is much wider than the baseboard 7 and about half as thick. It is therefore elastically deformable under the action of a strong force, although the bending stiffness is quite high.

In dem schmalen Spalt zwischen der hinteren Seitenwand 3 und der Halteleiste 8 ist ein Einwegmesser 10 eingespannt, das in üblicher Weise als Wendemesser mit zwei Schneiden 11, 12 ausgebildet ist. Die eine Schneide 11 steht ein wenig aus der zylindrischen Mantelfläche des Wellenkörpers 1 hervor. Die andere, in Reserve befindliche Schneide 12 liegt etwa in der Mitte der Halteleiste 8.In the narrow gap between the rear side wall 3 and the holding strip 8, a disposable knife 10 is clamped, which is designed in the usual way as a reversible knife with two cutting edges 11, 12. One cutting edge 11 protrudes a little from the cylindrical outer surface of the shaft body 1. The other cutting edge 12, which is in reserve, lies approximately in the middle of the holding bar 8.

Das Einwegmesser 10 hat an der Seite, die an der Halteleiste 8 anliegt, eine Nut 13. Die dem Messer zugekehrte Fläche der Halteleiste 8 ist mit einer Feder 14 versehen, deren Breite genau der Nut 13 entspricht, so daß die Feder 14 formschlüssig in die Nut 13 eingreift. Die unmittelbar an der hinteren Seitenwand 3 anliegende Rückseite des Einwegmessers 10 ist völlig eben.The disposable knife 10 has a groove 13 on the side which bears against the retaining strip 8. The surface of the retaining strip 8 facing the knife is provided with a tongue 14, the width of which corresponds exactly to the groove 13, so that the tongue 14 fits positively into the Groove 13 engages. The back of the disposable knife 10 lying directly against the rear side wall 3 is completely flat.

In dem keilförmigen Zwischenraum zwischen der Halteleiste 8 und der vorderen Seitenwand 4 sitzt passend ein Fliehkeil 15 mit den Spannflächen 16, 17. Die Spannfläche 16 ist breit und liegt daher nahezu auf der gesamten Höhe an der vorderen Seitenwand 4 an. Die andere Spannfläche 17 ist schmal und liegt nur unmittelbar gegenüber dem Einwegmesser 10 an der Vorderseite der Halteleiste 8 an. Die Verkürzung der Spannfläche 17 wird durch zwei über Eck angeordnete bogenförmige Ausnehmungen 18, 19 bewirkt. Die eine Ausnehmung 18, die sich bündig an die abgeschrägte schmale Stirnfläche 20 der Halteleiste 8 anschließt, bildet vor der Schneide 11 eine Spantasche. Die andere Ausnehmung 19 ist mit Rücksicht auf Schrauben 9 erforderlich. Neben den beiden Ausnehmungen 18, 19 verlaufen relativ schmale Stege 21 bzw. 22. Der äußere Steg 21 ist im gespannten Zustand nahezu bündig mit der Mantelfläche des Wellenkörpers 1. Der innere Steg 22 liegt mit geringem Abstand planparallel über dem Streifen 6 des Nutengrundes. Der Fliehkeil 15 kann aus Stahl bestehen, aber auch aus Leichtmetall, falls eine verringerte Spannkraft erwünscht ist.In the wedge-shaped space between the retaining strip 8 and the front side wall 4, a centrifugal wedge 15 with the clamping surfaces 16, 17 is suitably seated. The clamping surface 16 is wide and therefore lies against the front side wall 4 almost at its entire height. The other clamping surface 17 is narrow and only lies directly opposite the disposable knife 10 on the front of the retaining strip 8. The shortening of the clamping surface 17 is brought about by two arcuate recesses 18, 19 arranged at a corner. The one recess 18, which adjoins the bevelled narrow end face 20 of the retaining strip 8, forms a chip pocket in front of the cutting edge 11. The other recess 19 is necessary considering screws 9. In addition to the two recesses 18, 19, relatively narrow webs 21 and 22 run. The outer web 21 is in tension State almost flush with the lateral surface of the shaft body 1. The inner web 22 lies plane-parallel above the strip 6 of the groove base at a short distance. The centrifugal wedge 15 can be made of steel, but also of light metal if a reduced clamping force is desired.

Zum Auswechseln des Einwegmesser 10 wird zunächst der Fliehkeil 15 durch Krafteinwirkung gegen den Steg 21 gelöst. Die Halteleiste 8, die in gespanntem Zustand geringfügig in Richtung auf das Einwegmesser 10 elastisch verformt ist, kehrt in ihre entspannte Lage zurück.To replace the disposable knife 10, the centrifugal wedge 15 is first released by applying force against the web 21. The retaining strip 8, which is slightly deformed in the tensioned state in the direction of the disposable knife 10, returns to its relaxed position.

Dadurch wird der Sitz des Einwegmessers 10 gelockert, und dieses läßt sich leicht in Richtung der Wellenachse herausziehen.This loosens the seat of the disposable knife 10 and this can be easily pulled out in the direction of the shaft axis.

Anschließend wird ein neues Messer von der Stirnseite der Messerwelle her in Längsrichtung eingeschoben. Sobald die Messerwelle in schnelle Umdrehung versetzt wird, zieht sich der Fliehkeil 15 durch Zentrifugalkraft fest. Das Einwegmesser ist nun exakt eingespannt. Da der Fliehkeil 15 selbsthemmend ausgebildet ist, verbleibt er auch nach Stillsetzen der Messerwelle im gespannten Zustand.Then a new knife is inserted in the longitudinal direction from the front of the knife shaft. As soon as the knife shaft is set into rapid rotation, the centrifugal wedge 15 is tightened by centrifugal force. The disposable knife is now clamped exactly. Since the centrifugal wedge 15 is designed to be self-locking, it remains in the tensioned state even after the knife shaft has stopped.

Bei dem in Figur 2 dargestellten Ausführungsbeispiel ist die Spannfläche des Fliehkeils 25, die der vorderen Seitenwand 4 der Nut 2 zugekehrt ist, in der Mitte mit einer breiten längslaufenden Nut 26 versehen, so daß nur die Randzonen 27, 28 anliegen. Dadurch wird eine noch besser definierte Anlage erreicht. In dem Fliehkeil 25 sind mehrere über die Länge verteilte radiale Stellschrauben 29 angebracht, die an dem Nutengrund abgestützt sind. Mit Hilfe der Stellschrauben 29 kann schon im Ruhezustand eine gewisse Vorspannung erzeugt werden.In the embodiment shown in Figure 2, the clamping surface of the centrifugal wedge 25, which faces the front side wall 4 of the groove 2, is provided in the middle with a wide longitudinal groove 26, so that only the edge zones 27, 28 abut. As a result, an even better defined system is achieved. In the centrifugal wedge 25 there are several radial adjusting screws 29 distributed over the length, which are supported on the bottom of the groove. With the help of the set screws 29, a certain preload can be generated even in the idle state.

Ansonsten stimmt das Ausführungsbeispiel der Figur 2 mit dem in Figur 1 dargestellten Ausführungsbeispiel bis auf geringe konstruktive Abweichungen überein. Eine dieser Abweichungen besteht darin, daß die seitlichen Paßflächen der Nut- und Federverbindung zwischen dem Einwegmesser und der Halteleiste abgeschrägt sind.Otherwise, the exemplary embodiment in FIG. 2 is the same as the exemplary embodiment shown in FIG. 1 except for minor structural deviations. One of these deviations is that the lateral mating surfaces of the tongue and groove connection between the disposable knife and the retaining strip are chamfered.

Claims (8)

  1. A cutter block for a planing machine, with a body (1) which has several grooves (2) parallel to the axis and becoming narrower towards the generated surface, with a groove base (5, 6) lying radially on the interior, and in each of the grooves there is a one-way cutter (10) secured by a centrifugal wedge (15) and which has a retaining profiling, which engages in a corresponding counter-profiling, characterised in that the block body is formed as a single component and the counter-profiling is formed on a resiliently deformable single-piece retaining strip (8) which is located between the centrifugal wedge (15) and the one-way cutter (10), and which is immovably connected to the block body (1) on the groove base.
  2. A cutter block according to claim 1, characterised in that that the side of the one-way cutter (10) remote from the retaining strip (8) is immediately adjacent to a side wall (3) of the groove (2).
  3. A cutter block according to claim 2, characterised in that the retaining strip (8) is placed in front of the one-way cutter (10) in the direction of travel.
  4. A cutter block according to one of claims 1 to 3, characterised in that the retaining strip (8) together with a base strip (7) forms a profile which is L-shaped in cross-section, and the base strip (7) is bolted to the base of the groove (2).
  5. A cutter block according to claim 4, characterised in that the bolts (9) are secured with adhesive.
  6. A cutter block according to one of claims 1 to 5, characterised in that the centrifugal wedge (15, 25) is self-locking.
  7. A cutter block according to one of claims 1 to 6, characterised in that the centrifugal wedge (25) can be supported on the base of the groove (2) through locking bolts (29).
  8. A cutter block according to one of claims 1 to 7, characterised in that the centrifugal wedge (15, 25) is made of a light metal, e.g. aluminium.
EP87112395A 1986-10-28 1987-08-26 Cutter block Expired - Lifetime EP0265622B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87112395T ATE90017T1 (en) 1986-10-28 1987-08-26 KNIFE WAVE.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3636618 1986-10-28
DE19863636618 DE3636618A1 (en) 1986-10-28 1986-10-28 KNIFE SHAFT
DE3811601A DE3811601A1 (en) 1986-10-28 1988-04-07 Block body of a cutter block

Publications (3)

Publication Number Publication Date
EP0265622A2 EP0265622A2 (en) 1988-05-04
EP0265622A3 EP0265622A3 (en) 1989-11-23
EP0265622B1 true EP0265622B1 (en) 1993-06-02

Family

ID=25848838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112395A Expired - Lifetime EP0265622B1 (en) 1986-10-28 1987-08-26 Cutter block

Country Status (3)

Country Link
US (1) US4907631A (en)
EP (1) EP0265622B1 (en)
DE (2) DE8816602U1 (en)

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DE4137623A1 (en) * 1991-11-15 1993-05-19 Bosch Gmbh Robert HAND PLANER WITH ROTATING KNIFE CARRIER
US5469902A (en) * 1993-09-13 1995-11-28 American Knife, Inc. Chipper knife and knife holder assembly
DE29506458U1 (en) * 1995-04-15 1995-07-06 Leitz Geb Gmbh & Co Knife head, in particular planer knife head
FI96288C (en) * 1995-04-20 1996-06-10 Kone Wood Oy Device for attaching the knife to the rotating disc of a chop
DE19717702B4 (en) * 1997-04-26 2006-04-20 Robert Bosch Gmbh Portable planer
DE19726993A1 (en) * 1997-06-25 1999-01-07 Jagenberg Papiertech Gmbh Material web especially paper or cardboard, cross cutting machine drum
DE19835724B4 (en) * 1998-08-07 2007-04-26 Robert Bosch Gmbh planer head
DE19835725B4 (en) * 1998-08-07 2016-08-04 Robert Bosch Gmbh planer head
CH709488A1 (en) 2014-04-14 2015-10-15 Oertli Werkzeuge Ag Tool head and method for inserting and clamping a cutting board and cutting board.
US9802334B2 (en) 2014-07-10 2017-10-31 Kimwood Corporation Cutter head assembly for a knife planer
US10051798B2 (en) * 2014-11-12 2018-08-21 Leonardi Manufacturing Co., Inc. Various improvements to stump cutting tool discs and elements thereof
CN104707698B (en) * 2015-04-10 2016-11-16 广州市联冠机械有限公司 Rotate rotor, toolbox and steel wire separator

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DE617874C (en) * 1935-11-20 1936-09-05 Maschb Leya A G Device for holding the knife in the knife shaft for planing machines
DE2159336A1 (en) * 1970-12-16 1972-07-06 Dijet Kogyo K K CUTTER
NL7205104A (en) * 1972-04-14 1973-10-16
CA1040072A (en) * 1975-07-14 1978-10-10 Arnold Schmidt Cutter shaft for wood machining apparatus
DE2723076A1 (en) * 1977-05-21 1978-11-30 Schake Kupfermuehle Masch CUTTER SHAFT FOR WOOD PLANING MACHINES
DE2730800C3 (en) * 1977-07-07 1980-02-21 Vereinigte Edelstahlwerke Ag (Vew), Wien Knife arrangement for a bevel cutter shaft of a wood cutting machine
DE2811669C2 (en) * 1978-03-17 1983-11-17 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Planer head with reversible knives
EP0033382B1 (en) * 1980-01-31 1984-11-28 HOMBAK Maschinenfabrik GmbH u. Co KG Cutter block for producing plane matchwood
DE3102065C2 (en) * 1980-03-08 1986-01-09 Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker Knife holder for knife shafts or knife heads
DE3209445A1 (en) * 1982-03-16 1983-10-06 Reinhold W Dr Ing Elsen Knife shaft for the production of flat wood chips
DE3412251A1 (en) * 1984-04-02 1985-10-10 Dimetal Z.I. du Phare, Mérignac Cutter holder for the cutter shaft of a woodworking machine
DE3437688C1 (en) * 1984-10-15 1986-01-23 Inter-Wood-Maschinen GmbH & Co KG, 8923 Lechbruck Knife holder for the knife head of a wood cutting machine

Also Published As

Publication number Publication date
DE8816602U1 (en) 1990-01-04
EP0265622A2 (en) 1988-05-04
DE3811601A1 (en) 1989-10-26
EP0265622A3 (en) 1989-11-23
US4907631A (en) 1990-03-13

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