EP0005906B1 - Rotierendes Schneidwerkzeug und Verfahren zu seiner Herstellung - Google Patents

Rotierendes Schneidwerkzeug und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0005906B1
EP0005906B1 EP19790300718 EP79300718A EP0005906B1 EP 0005906 B1 EP0005906 B1 EP 0005906B1 EP 19790300718 EP19790300718 EP 19790300718 EP 79300718 A EP79300718 A EP 79300718A EP 0005906 B1 EP0005906 B1 EP 0005906B1
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EP
European Patent Office
Prior art keywords
discs
blade
cutterblock
spindle
rotary
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
EP19790300718
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English (en)
French (fr)
Other versions
EP0005906A1 (de
Inventor
Michael Robert Jackson
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.)
Wadkin PLC
Original Assignee
Wadkin PLC
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 Wadkin PLC filed Critical Wadkin PLC
Publication of EP0005906A1 publication Critical patent/EP0005906A1/de
Application granted granted Critical
Publication of EP0005906B1 publication Critical patent/EP0005906B1/de
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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
    • B27G13/12—Cutter blocks; Other rotary cutting tools for profile cutting
    • 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
    • B27G13/005—Tools composed of two or more rotating discs

Definitions

  • This invention relates to a rotary cutterblock for woodworking machinery, and particularly for moulding machines which produce, in a single passage of timber through the machine, a constant profile longitudinally of the timber.
  • Rotary cutterblocks are known in which knives, or blades, are bolted or wedged onto a rotary block of constant section.
  • the concept of wedging the blades in the block is known, for example, from "Holztechnotechnisch Handbuch” by Dr. Dipl. Ing. Leopold Vorreiter (see especially Fig. 522 on page 702). Where the blades are required to cut deeper into the timber they extend further from the block.
  • solid profile cutters in which the cutting edges are integral with the body of the block, the whole being formed to the desired profile to be cut into timber. Both these rotary cutterblocks are noisy in operation, however, and it is necessary to provide the machines with acoustic hoods or to provide the users with ear protectors to reduce the risk of damage to the hearing of operators and other workpeople in the vicinity.
  • U.S. Patent N. 3,986,543 discloses a rotary cutterblock in which a row of blade-supporting disc elements is mounted on a common spindle to form a composite cutterblock. Each disc element includes integral blade-supporting arms which are shaped so that together they follow the profile of the workpiece to be cut into the timber.
  • the US Patent teaches rotating the blade-supporting discs until the arms and blades are in axial alignment, grinding the profile by conventional methods, and then rotating the discs again to provide an angular spacing of the blades around the axis of the spindle. This produces a cutterblock which has some advantages of quiet operation associated with a helically bladed block, but unfortunately is expensive to manufacture since the individual disc elements with their integral blade-supporting arms have to be machined separately.
  • a lower priced cutterblock assembly is disclosed in French Patent Specification No 812964.
  • Cutter teeth are formed in the periphery of disc elements stamped from sheet metal, and a number of such disc elements are assembled into a cutterblock by mounting them on a spindle with spacer discs between adjacent disc elements to accommodate the width of the formed teeth.
  • the invention provides a rotary cutterblock for woodworking machinery, comprising a blade holder body comprising a row of discs of different diameters on a common mounting spindle, each disc having wedged therein knife blades.
  • the knife blades are ground so as to form, together, a cutting edge to provide the desired profile in the timber.
  • the disc diameters should be chosen to reduce, as far as possible, the length of knife blade extending from each disc. Thus in an axial position of the disc where the knife blades are to cut deep into the timber a larger disc can be used, thereby reducing the amount of unsupported blade in that zone extending from the blade holder body to the workpiece.
  • the mass of the resulting cutterblock is large. It has been found that the mass can be reduced substantially, and the advantages of quieter running maintained, if adjacent discs of the body of the cutterblock are separated by spacer discs of smaller diameter, with the knife blades wedged in the discs being of an axial length sufficient to span the spacing between the discs.
  • each knife blade extends axially of the cutterblock and all of the blades are aligned to cut the timber at the same time, certain noise disadvantages of a conventional straight bladed cutterblock are inherent.
  • the noise level of operation can very readily be improved in a cutterblock according to this invention by rotating each disc relative to the others so that the knife blades are staggered around the circumference of the cutterblock.
  • the noise advantages of a spiral bladed cutterblock are then obtained, without the attendant disadvantages of manufacturing and grinding costs.
  • the discs may first be assembled with the blades in alignment for grinding purposes. After the desired profile has been ground across the line of blades, the discs may then be rotated, one relative to the other, to provide the staggered blade disposition referred to above.
  • the invention is particularly suited to the use of tungsten carbide blades, as each blade is of a short axial length relative to the total length of the cutterblock, and therefore of a size that can readily be produced from tungsten carbide.
  • Other blade materials can be used, however, and the use of high speed steel is generally very satisfactory.
  • Each disc may carry two or more knife blades, with the blades evenly spaced around the periphery to provide a balanced cutterblock.
  • Figure 1 shows a disc 10 for use in the assembly of the cutterblock of Figures 2 and 3. It has two diametrically opposite housings 12 each of which is shaped to receive a knife blade 14 and a holding wedge 16 as shown in Figure 3.
  • the wedges 16 are forced radically outwardly of their housings 12 by means of Allen screws -18 as indicated in Figure 3.
  • a rear face of each knife blade 14 is serrated longitudinally of the cutterblock so as to obtain a secure clamping of the blades in the housing 12 by the wedges 16.
  • the means for locking the wedges in their housings may be screws acting between the wedges 16 and the sides of the housings 12 remote from the knife blades 14. Such screws have the effect of jacking the wedges 16 off the sides of the housings against the knife blades 14. This means for locking the wedges in their housings is not illustrated as it is a well known and sometimes preferred method of blade mounting in rotary cutterblocks.
  • the discs are threaded onto a mounting shaft 20 ( Figure 3), with smaller diameter spacer discs 22 separating adjacent discs 10.
  • the different discs 10 are chosen from a stock of discs of different diameters so that each disc approaches as nearly as possible the profile of the wood moulding W ( Figure 2) which is intended to be formed.
  • a key slot 24 in each of the discs 10 cooperates with a longitudinal key (not shown) on the mounting shaft 20 to keep the housings 12 on the different discs in precise axial alignment as the discs are threaded onto the shaft.
  • Blade elements 14 are then mounted in the housings 12 using the wedges 16 and Allen screws 18 as described above, with the edges of adjacent blades in close abutment one with another.
  • the profile of the desired wood moulding is then ground across all of the blades 14.
  • the assembled cutterblock can be mounted on the spindle of a woodwork moulding machine by means of a taper mounting of the machine which cooperates with a taper 28 formed in an axial bore 30 of the mounting shaft 20.
  • a taper mounting of the machine which cooperates with a taper 28 formed in an axial bore 30 of the mounting shaft 20.
  • Other known methods of mounting are of course possible.
  • the mounting shaft 20 may have an axial bore therethrough for receiving a cylindrical machine spindle.
  • the mounting method is not however material to this invention and other mounting methods are not illustrated.
  • the length of unsupported blade 10 extending from the cutterblock is small compared with prior art high profile cutterblocks. This reduces considerably the noise of operation. The noise is reduced further by staggering the individual blades 14 as shown in Figure 3, thereby ensuring that no blade the full axial width of the cutterblock strikes the timber at any one instant.
  • Blades can be replaced one at a time if they become damaged but it is then necessary to re-grind the assembly to produce the desired blade profile again.
  • the blades may be sharpened by grinding or may be reduced to a common profile by the process of jointing.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Claims (3)

1. Ein rotierender Messerkopf für Holzbearbeitungsmaschinen, bestehend aus einer Anzahl von auf einer gemeinsamen Spindel (20) angeordneten Messertragscheiben (10), wobei die zur Bearbeitung einer Holzleiste auf ein gewünschtes Profil geschliffenen Messer (14) in axialer Richtung der Spindel (20) winklig versetzt voneinander angeordnet sind,
dadurch gekennzeichnet daß jede Scheibe (10) generell kreisförmig ausgebildet und auf ihrem Umfang mit mindestens einer keilförmigen Aussparung (12) versehen ist, daß in jeder Aussparung ein mit Hilfe eines Verkeilungselementes (16) befestigtes Messer (14) angeordnet ist, und daß die verschiedenen Scheiben (10) in ihrem Durchmesser so gewählt sind, daß sie möglichst genau der gewünschten Kontour der Holzleiste entsprechen.
2. Rotierender Messerkopf nach Anspruch 2, wobei auf der Spindel (20) nebeneinander angeordnete Scheiben (10) durch Abstandsscheiben (22) kleineren Durchmessers voneinander getrennt sind, und wobei die in den Scheiben (10) verkeilten Messer (14) in axialer Richtung gesehen so lang sind, daß sie den zwischen den Scheiben bestehenden Abstand überbrücken.
3. Verfahren zur Herstellung eines rotierenden Messerkopfes nach Anspruch 2, wobei eine Reihe von Messertragscheiben (10) und Abstandsscheiben (22) abwechselnd auf einer Tragspindel (30) befestigt werden, wobei die Abstandsscheiben im Durchmesser sehr viel geringer sind als die Messertragscheiben, deren Durchmesser so gewählt, sind, daß sie möglichst genau dem gewünschten Profil der Formleiste entsprechen; wobei die Messer (14) in den auf dem Umfang der Messertragscheiben vorgesehenen Aussparungen (12) mit Hilfe von Verkeilungselementen (16) befestigt werden, so daß die Messer in einer über den Messerkopf verlaufenden Reihe aufeinander ausgerichtet sind und die gesamte Breite des Messerkopfes umspannen; wobei die Messer entsprechend dem gewünschten Profil geschliffen und dann von der Tragspindel entfernt werden; und wobei die Messertragscheiben und Abstandsscheiben in der gleichen Reihenfolge wieder auf die Tragspindel in der Weise aufmontiert werden, daß benachbarte Messer winklig voneinander versetzt sind, so daß sich auf dem Umfang des Messerkopfes eine verteilte Anordnung der verschiedenen Messer ergibt.
EP19790300718 1978-05-31 1979-04-27 Rotierendes Schneidwerkzeug und Verfahren zu seiner Herstellung Expired EP0005906B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2604778 1978-05-31
GB2604778 1978-05-31

Publications (2)

Publication Number Publication Date
EP0005906A1 EP0005906A1 (de) 1979-12-12
EP0005906B1 true EP0005906B1 (de) 1981-08-12

Family

ID=10237520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790300718 Expired EP0005906B1 (de) 1978-05-31 1979-04-27 Rotierendes Schneidwerkzeug und Verfahren zu seiner Herstellung

Country Status (3)

Country Link
EP (1) EP0005906B1 (de)
DE (1) DE2960620D1 (de)
ES (1) ES481431A0 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087792B (en) * 1980-11-25 1985-03-06 Wadkin Ltd Profiling discs for woodworking machinery
FR2760674B1 (fr) * 1997-03-11 1999-05-28 Andre Dieu Perfectionnement aux outils de coupe rotatifs a couteaux amovibles
US6688351B2 (en) * 2002-02-20 2004-02-10 Key Knife, Inc. Adjustable profiling head for a wood cutting apparatus
GB2386341B (en) * 2002-03-12 2005-09-21 Stephen Richard Welch Woodworking cutter block
US7343946B2 (en) 2004-03-16 2008-03-18 Key Knife, Inc. High speed planer head
US7708040B2 (en) 2004-03-16 2010-05-04 Key Knife, Inc. High speed planer head
IT201800009896A1 (it) * 2018-10-30 2020-04-30 Metal World Spa Kit di fresatura di semilavorati e relativo metodo di fresatura

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE387408A (de) *
US1535673A (en) * 1923-08-08 1925-04-28 Henry F Loewer Machine for turning irregular objects
FR812964A (fr) * 1936-01-28 1937-05-21 Outil de fraisage pour le travail du bois et autres matières tendres
FR980146A (fr) * 1949-02-04 1951-05-08 Procédé pour la fermeture hermétique de toutes parties ouvrantes
US3237275A (en) * 1963-12-12 1966-03-01 Burton E Middleton Cutting tools
US3986543A (en) * 1975-07-21 1976-10-19 Kimball International, Inc. Rotary cutter knife

Also Published As

Publication number Publication date
DE2960620D1 (en) 1981-11-12
ES8101451A1 (es) 1980-12-16
ES481431A0 (es) 1980-12-16
EP0005906A1 (de) 1979-12-12

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