EP1574307B1 - Hobelwerkzeug - Google Patents

Hobelwerkzeug Download PDF

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Publication number
EP1574307B1
EP1574307B1 EP05101758A EP05101758A EP1574307B1 EP 1574307 B1 EP1574307 B1 EP 1574307B1 EP 05101758 A EP05101758 A EP 05101758A EP 05101758 A EP05101758 A EP 05101758A EP 1574307 B1 EP1574307 B1 EP 1574307B1
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EP
European Patent Office
Prior art keywords
blade
hollow
tool
clamping element
main body
Prior art date
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Active
Application number
EP05101758A
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English (en)
French (fr)
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EP1574307A3 (de
EP1574307A2 (de
Inventor
Antonio Solari
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.)
STARK SpA
Original Assignee
STARK SpA
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Filing date
Publication date
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Publication of EP1574307A2 publication Critical patent/EP1574307A2/de
Publication of EP1574307A3 publication Critical patent/EP1574307A3/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
    • B27G13/02—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

Definitions

  • the present invention concerns a planing tool, used mainly for working wood and comprising a main body, able to be made to rotate, on the periphery of which one or more blades are mounted.
  • Planing tools comprising a main body on the periphery of which one or more blades are mounted radially.
  • Each blade is removably associated with the main body in correspondence with a hollow, by means of a clamping element or block, and by screws that clamp it under pressure against a wall of said hollow.
  • This type of clamping makes the operations to assemble and dis-assemble the blades, which are necessary for their periodic sharpening and replacement, long and laborious, particularly due to the need to correctly reposition the blades after their height has been changed by the sharpening operation, so as not to compromise the cutting efficiency and precision of the tool.
  • blades which are equipped with a longitudinal groove which couples with a mating protrusion present on the wall of the hollow; this coupling guarantees a univocal assembly position of the blade inside the hollow, and hence considerably speeds up the operations to restore the tool to operations.
  • the hollow has a dove-tail conformation which narrows towards the outside of the main body, so that when the block, of mating shape, is subjected to centrifugal force during the use of the tool, it is clamped with great interference in the outer part of the hollow. This causes the blade to be clamped under pressure. The blade is removed by hitting forcefully on the block so as to thrust it towards the bottom of the hollow, thus freeing the blade from the pressure exerted on it by the block.
  • FR-A-610.027 upon which the preamble of the main claim is based, discloses a planing tool having a blade positioned in a hollow made on the periphery of the main body of the tool, and a block, able to clamp through interference the blade against a wall of the hollow.
  • This document also discloses elastic means configured to push outwardly the block in order to exert a pressure against the blade, and screw means coupled with the insert and able to be screwed towards the inner of the tool in order, as a reaction, to move the insert outwardly, i.e. in the opposite direction than that of the screw, so increasing the blockage pressure of the insert against the blade due to the angles formed by the inner wall of the hollow.
  • One purpose of the present invention is to achieve a planing tool that allows rapid replacement, precise positioning even after removal and sharpening, and a stable clamping of the blades with respect to the main body, at the same time allowing rapid and easy operations to assemble/dis-assemble said blades, so as to limit to a minimum the inactive times of the machine.
  • Another purpose of the invention is to provide a planing tool that is easy, quick and economical to make, and that has characteristics of great reliability and working efficiency.
  • the planing tool according to the invention comprises a main body, at least a blade and at least a clamping element or block, housed in a hollow made on the periphery of the main body and able to clamp the blade under pressure against a wall of the hollow; the hollow has a section profile with a dove-tail shape that narrows from the inside to the outside of the main body.
  • the tool also comprises elastic means, able to keep the clamping element normally thrust against the blade, and means to adjust, and particularly to selectively release, the pressure exerted by the clamping element on the relative blade.
  • the pressure adjustment means are able to selectively take the clamping element from a first active position, wherein it is thrust by said elastic means in order to block the blade under pressure against the wall, to a second at least partly passive position wherein, contrasting the thrust of the elastic means, it slackens the pressure on the blade in order to allow it to be removed from the relative hollow.
  • the block moves inwardly with respect to said main body, and therefore it is progressively distanced from said blade, thus releasing the pressure on the blade and allowing its removal.
  • the hollow has at least a first wall, against which the blade is able to be clamped, a bottom and a second wall opposite the first.
  • the pressure adjustment means of the clamping element are able to move the latter in a direction towards/away from the center of the main body, and substantially parallel to the second wall. Thanks to the dove-tailed conformation of the hollow, this movement respectively takes the clamping block towards the first wall, increasing the clamping pressure on the blade, or distances it from the first wall, reducing the clamping pressure until the blade is freed and can be removed.
  • the pressure adjustment means of the clamping element comprise at least a screw that can be selectively screwed into a threaded hole made radially on the main body, in a position adjacent to the hollow, in order to take the clamping element from the first to the second position or vice versa.
  • the screw has a widened head able to engage in a mating hollow made in the wall of the clamping element opposite that in contact with the blade.
  • the selective screwing of the screw determines a mating displacement of the clamping element towards the inside or towards the outside of the hollow, thanks to the drawing action exerted thereon by the head of the screw.
  • the clamping element is associated with guide means that prevent it from coming out of the hollow.
  • the clamping element and the blade comprise respective coupling means able to cooperate with each other in order to determine the correct reciprocal positioning thereof.
  • the blade and the hollow also have respective coupling means, consisting of a groove made in the wall of the hollow and a mating longitudinal protrusion made in a mating position on the wall of the blade.
  • the clamping element when the clamping element moves to the pressure release position, it moves only slightly away from the blade, so that the longitudinal protrusion of the latter remains partly inserted in the groove of the hollow and the blade can be removed only laterally from the hollow,
  • the clamping element when taken to the pressure release position, it allows the blade to be completely free from interference with the groove so as to allow the blade to be removed radially from the hollow.
  • the number 10 denotes generally the planing tool according to the present invention, which comprises a main body 11 and a plurality of blades 12 assembled removably on its periphery.
  • the main body 11 has on its periphery a plurality of hollows 15 arranged radially, in correspondence with each of which a block 13 is inserted to clamp a mating blade 12.
  • Each block 13 is associated with an adjustment screw 14 and two preloading springs 20, the function of which will be explained hereafter.
  • the tool 10 has four hollows 15 for four corresponding blades 12 and blocks 13, but it comes within the field of the invention to provide a different number of hollows 15, and hence of blades 12 and blocks 13.
  • the blades 12 are provided at the ends with two specular cutters and, in a substantially central position, have a longitudinal protrusion 29, in this case with a trapezoid section.
  • the hollows 15 have a dove-tailed conformation, narrowing towards the outside, and each of them has a first wall 16, a bottom 17 and a second wall 18, opposite the first, which in this case is arranged on a plane passing through the longitudinal axis "x" of the main body 11.
  • a longitudinal groove 28 is made, in which the protrusion 29 of the blade 12 is inserted, in order to guarantee a univocal assembly positioning of the blade 12 on the main body 11 and prevent the accidental detachment of the blade 12 itself.
  • Each hollow 15 also has, at a substantially central point, accessible from the outside, a wider portion 19 in which the adjustment screw 14 is housed; on the bottom of the wider portion 19 a threaded hole 21 is made, advantageously facing towards the center of the main body 11, inside which the screw 14 can be selectively screwed.
  • the screw 14 has a widened head 14a advantageously having a "Torx" type impression.
  • two housing seatings 26 are made for corresponding springs 20, and two blind holes 27.
  • Each block 13 has a conformation mating with that of the relative hollow 15 and defines a front surface 22 arranged, during use, substantially parallel to the first wall 16 of the hollow, a lower supporting surface 23, and a sliding surface 24 which is arranged, during use, in contact with the second wall 18.
  • the blade 12 is arranged between the front surface 22 and the first wall 16.
  • the front surface 22 and the sliding surface 24 are connected by an outer discharge surface 25, advantageously curved so as to promote the discharge of the chip that is generated when the tool 10 is in use.
  • a hollow 30 is made, open towards the wider portion 19, wherein part of the head 14a of the screw 14 is inserted; this hollow 30 defines an outer abutment surface 30a and an inner abutment surface 30b for the head 14a of the screw 14.
  • the block 13 also has two pins 31 able to be inserted into the blind holes 27 which, apart from facilitating the correct positioning of the block 13 during the assembly step of the tool 10, also have the function of guiding the block 13 radially and of preventing the lateral displacement thereof when the tool 10 is functioning, as will be explained hereafter.
  • the block 13 In the assembled condition of the tool 10, the block 13 has the pins 31 inserted into the blind holes 27 (fig. 7) and is kept thrust towards the outside of the main body 11, and hence towards the first wall 16 of the hollow 15, by the preloading springs 20 (fig. 4).
  • the screw 14 is only partly screwed into the threaded hole 21, so that the head 14a is arranged against the outer abutment surface 30a of the hollow 30 (fig. 5).
  • the blade 12 has the protrusion 29 inserted into the longitudinal groove 28.
  • the block 13 In this position, the block 13 is kept in a first position wherein it clamps the blade 12 under pressure against the first wall 16, due to the effect of the thrust imparted thereto both by the preloading springs 20 and also by the head 14a of the screw 14.
  • the centrifugal force to which the block 13 is subjected causes the latter, thrust towards the outside and thanks to the conformation of the hollow 15, to further increase the pressure exerted on the blade 12, guaranteeing a great clamping force.
  • the presence of the pins 31 on the contrary prevents the lateral displacement of the block 13.
  • Each blade 12 can be removed, for example in order to be sharpened or replaced, without needing to dismantle the tool 10 from the machine on which it is installed.
  • the displacement of the block 13 can be such as to allow the complete withdrawal of the protrusion 29 from the groove 28 in order to then allow the radial extraction of the blade 12 with respect to the main body 11.
  • the subsequent re-assembly of the tool 10 can be performed by keeping the latter on board the machine. In fact, it is enough to re-insert the blade 12 with the protrusion 29 in the groove 28, so that it is positioned parallel to the bottom 17 of the hollow 15 automatically and with a univocal positioning, and then progressively unscrew the screw 14 until the block 13 is returned towards the outside of the hollow 15, thus clamping the blade 12.
  • the block 13 has one or more ridges or impressions, able to cooperate with mating impressions or ridges made on the blade 12, in order to facilitate the correct longitudinal positioning thereof.
  • the conformation of the hollow 15 allows to house both blades 12 with cutters parallel to the longitudinal axis "x" of the main body 11 (figs. 2 and 3), and also blades 12 with arched cutters for so-called “helical” planing tools 10, arranged inclined with respect to said longitudinal axis "x" (figs. 8 and 9), which allow a progressive planing action on the piece to be worked.
  • the very conformation of the hollow 15 and the position of the groove 28, in proximity with the outer profile of the main body 11, allow to use mills, or other equipment, of greater size which allow more simple and repeatable operations in order to make the groove 28 itself, with advantages in terms of costs and production times for the tool 10.
  • the number of pins 31 or preloading springs 20 may vary, or the latter can be replaced by other elastic means with the same function.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Knives (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Magnetic Ceramics (AREA)
  • Milling Processes (AREA)

Claims (9)

  1. Hobelwerkzeug bestehend aus einem Hauptkörper (11), mindestens einer Klinge (12) und mindestens einem in einer Aussparung (15) beherbergten Einspannelement (13), welches auf dem Umfangsrand des Hauptkörpers (11) angeordnet ist, und dazu im Stande ist die Klinge (12) durch Andruck gegen eine Wand (16) der Aussparung (15) einzuspannen, das Werkzeug weist außerdem Elastikelemente (20) auf, welche im Stande sind das Einspannelement (13) gegen die Klinge (12) zu drücken, und eine Schraube (14), welche dazu geeignet ist, in eine Gewindebohrung (21) eingeschraubt zu werden, die auf dem Hauptkörper (11) zur Einstellung des Andrucks angeordnet ist, welcher durch das Einspannelement (13) ausgeübt wird,
    dadurch gekennzeichnet, dass die Schraube (14) einen Kopf (14a) aufweist, welcher im Stande ist auf einen Teil des Einspannelements (13) einzuwirken zur wahlweisen Führung des Letzteren von einer ersten Stellung, worin ein Druck auf ein Elastikelement (20) zum Einspannen der Klinge (12) unter Andruck gegen eine Wand (16) ausgeübt wird, in eine zweite Stellung, worin, entgegen dem ausgeübten Druck des Elastikelementes (20) zu klemmen, wobei dieser mit Bezug auf den Hauptkörper (11) nach innen verschoben ist und folglich von der Klinge (12) fortschreitend entfernt wird, wodurch der Druck auf der Klinge (12) verringert wird, um das Entfernen aus der Aussparung (15) zu ermöglichen.
  2. Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass der Hohlraum (15) einen schwalbenschwanzförmigen Querschnitt aufweist, welcher sich von innen nach außen mit Bezug auf den Hauptkörper (11) verschmälert, wobei in der ersten Stellung der Einspannelement (13) durch das Elastikelement (20) zur Außenseite der Aussparung (15) gedrückt ist, während in der zweiten Stellung des Einspannelement (13) zum Innenraum der Aussparung (15) durch die Einstellschraube (14) vorgeschoben ist.
  3. Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass in einer angrenzenden Position zu der Aussparung (15) eine breitere Position (19) vorgesehen ist, welche im Stande ist die Schraube (14) mindestens teilweise aufzunehmen, auf der Unterseite der breiteren Position (19) ist eine Gewindebohrung (21) zur Aufnahme der Schraube (14) vorgesehen, wobei die breitere Position (19) nach außen hin geöffnet ist, um der Schraube (14) von der Außenseite des Werkzeugs (10) her Zugang zu gewähren,
  4. Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass das Einspannelement (13) auf seiner Oberfläche (24) gegenüberliegend jener (Klingen-Oberfäche) (22) in Verbindung mit der Klinge (12) eine Aussparung (30) einschließt, in welche der Kopf (14a) der Schraube (14) eingefügt ist, wobei die Aussparung (30) zwei, sich gegenüberliegende Widerlageroberflächen (30b, 30a) für den Kopf (14a) aufweist, um jeweils das Einspannelement von der ersten in die zweite Position zu bewegen.
  5. Werkzeug nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass das Elastikelement mindestens eine Feder (20) aufweist, welche in einer zugehörigen Aufnahme (26) an der Unterseite des Lochs der Aussparung (15) angeordnet ist.
  6. Werkzeug nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass das Einspannelement (13) Mittel (31) zur Gewährung einer Führungsbewegung von der ersten in die zweite Position und zur Verhinderung einer Entfernung aus der Aussparung (15) aufweist.
  7. Werkzeug nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Aussparung (15) auf der Wand (16) in Verbindung mit der Klinge (12) eine Durchgangsnut (28) aufweist, und die Klinge (12) einen Vorsprung zur Einführung in die Durchgangsrille (28) aufweist, worin in der zweiten Position das Einspannelement (13) von der Wand (16) durch eine Funktionseinheit beabstandet ist, so dass die Längsnut (29) teilweise in der Durchgangsnut (28) eingeführt bleibt, wobei die Klinge (12) lediglich seitlich aus der Aussparung (15) entfernt werden kann.
  8. Werkzeug nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Aussparung (15) auf der Wand (16) in Verbindung mit der Klinge (12) eine Nut (28) aufweist, und die Klinge (12) einen Vorsprung (29)aufweist, welcher zum Einführen in die Nut (28) geeignet ist, wobei in der zweiten Position das Einspannelement (13) von der Wand (16) durch eine Funktionseinheit beabstandet ist, so dass der Längsvorsprung (29) vollkommen aus der Nut (28) entfernt ist, wodurch die Klinge (12) radial aus der Aussparung (12) entfernt wird.
  9. Werkzeug nach einem der vorangegangen Ansprüche, dadurch gekennzeichnet, dass die Klinge (12) mit Bezug auf die Längsachse ("x") des Hauptkörpers (11) geneigt angeordnet ist.
EP05101758A 2004-03-09 2005-03-07 Hobelwerkzeug Active EP1574307B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000042A ITUD20040042A1 (it) 2004-03-09 2004-03-09 Utensile di piallatura
ITUD20040042 2004-03-09

Publications (3)

Publication Number Publication Date
EP1574307A2 EP1574307A2 (de) 2005-09-14
EP1574307A3 EP1574307A3 (de) 2005-11-30
EP1574307B1 true EP1574307B1 (de) 2007-08-15

Family

ID=34814976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05101758A Active EP1574307B1 (de) 2004-03-09 2005-03-07 Hobelwerkzeug

Country Status (4)

Country Link
EP (1) EP1574307B1 (de)
AT (1) ATE369952T1 (de)
DE (1) DE602005001956T2 (de)
IT (1) ITUD20040042A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH709488A1 (de) * 2014-04-14 2015-10-15 Oertli Werkzeuge Ag Werkzeugkopf und Verfahren zum Einsetzen und Spannen einer Schneidplatte, sowie Schneidplatte.
DE102014015199A1 (de) * 2014-10-10 2016-04-14 Leitz Gmbh & Co. Kg Messerkopf zur spanenden Bearbeitung von Werkstoffen und Messer hierfür
DE102019111986B3 (de) * 2019-05-08 2020-09-17 Leitz Gmbh & Co. Kg Verfahren zum Schärfen eines in einen Messerkopf einsetzbaren Messers und Messerkopf mit geschärftem Messer
CN110823268B (zh) * 2019-11-22 2021-05-07 徐州双裕电子技术有限公司 一种便于维护的传感器
EP4082734A1 (de) 2021-04-27 2022-11-02 Fantacci Industrie S.r.l. Schneidkopf für eine maschine zur spanabhebenden bearbeitung von materialien
DE102022102557A1 (de) 2022-02-03 2023-08-03 TKM GmbH Schneidmesser

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR610027A (fr) * 1925-06-06 1926-08-28 Const Mecaniques De Vendeuvre Dispositif de serrage des lames de machines-outils rotatives à grande vitesse
DE1154612B (de) * 1960-09-29 1963-09-19 Hombak Maschinenfab Kg Messerwelle fuer Holzzerspanungsmaschinen
IT1153491B (it) * 1982-04-15 1987-01-14 Gianfranco Cecchi Albero portacoltelli con coltelli a sviluppo elicoidale per piallatrici da legno
IT1233494B (it) * 1989-06-30 1992-04-02 Scm International Spa Ora Scm Pialla a bloccaggio dinamico e metodo per realizzarla
US5133394A (en) * 1989-11-17 1992-07-28 Peter Landtwing Quick-clamping device operated by centrifugal force, for planing blades

Also Published As

Publication number Publication date
ITUD20040042A1 (it) 2004-06-09
DE602005001956T2 (de) 2008-05-08
EP1574307A3 (de) 2005-11-30
DE602005001956D1 (de) 2007-09-27
ATE369952T1 (de) 2007-09-15
EP1574307A2 (de) 2005-09-14

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