EP1013385B1 - Blocking device for a cutting insert on a milling machine - Google Patents

Blocking device for a cutting insert on a milling machine Download PDF

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Publication number
EP1013385B1
EP1013385B1 EP99830775A EP99830775A EP1013385B1 EP 1013385 B1 EP1013385 B1 EP 1013385B1 EP 99830775 A EP99830775 A EP 99830775A EP 99830775 A EP99830775 A EP 99830775A EP 1013385 B1 EP1013385 B1 EP 1013385B1
Authority
EP
European Patent Office
Prior art keywords
knife
pin
recess
blocking
blocking pin
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
EP99830775A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1013385A1 (en
Inventor
Fulvio Galvagni
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.)
Rekord Srl
Original Assignee
Rekord Srl
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 Rekord Srl filed Critical Rekord Srl
Publication of EP1013385A1 publication Critical patent/EP1013385A1/en
Application granted granted Critical
Publication of EP1013385B1 publication Critical patent/EP1013385B1/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
    • 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
    • B27G13/08—Cutter blocks; Other rotary cutting tools in the shape of disc-like members; Wood-milling cutters
    • B27G13/10—Securing the cutters, e.g. by clamping collars

Definitions

  • This invention concerns milling machines with inserts for working wood, in general, and, more particularly, a blocking device for a cutting insert on a milling machine.
  • the knives fixed to the milling body are subject to a tipping moment in the opposite direction to that in which they work, due to the resistance they encounter in cutting the wood and to a centrifugal force, deriving from the rotation of the mill.
  • Each knife must therefore be blocked on the milling body in such a way as to resist such forces, in order to ensure the precise and steady position of the knife.
  • the knife is fixed to the milling body with the help of a blocking pin, which is held directly against the knife, pulled or pushed by at least one tightening screw that passes through a hole in the milling body and is screwed to the pin.
  • a blocking pin which is held directly against the knife, pulled or pushed by at least one tightening screw that passes through a hole in the milling body and is screwed to the pin.
  • the blocking pin still presses directly against the knife, pulled by at least one tightening screw and has, on the rear, a peg or projection that interacts with an orthogonal hole in the milling body, at the base of the slot that contains the knife.
  • the peg or projection acts as a means of resisting the centrifugal force to which the knife is subject when the milling machine is in operation.
  • a tightening screw is employed with a pin that has one surface divided into two separate parts; the upper plane is angled to press against the knife and the lower plane is angled against a correspondingly angled surface at the bottom of the slot for housing the knife.
  • the blocking pin can also resist the centrifugal force to which the knife is subjected, but its use is limited to pantograph tips.
  • the aim of the present invention is to propose a fastening device for a cutting insert or knife on a milling body, which is innovative in the shape and disposition of the blocking pin and suitable for effectively resisting both the tipping moment and the centrifugal force to which the knife is subjected, without, above all, affecting the space taken up by the pin and, consequently, the depth of the slot in which the knife and pin are mounted.
  • FIG. 1 represents part of a milling body 11, with one of its peripheral slots 12, designed to house a cutting insert or knife 13, with the help of a blocking pin 14 and at least one tightening screw 15.
  • the whole milling body will have as many peripheral slots as there knives to put in them and every knife will be fixed individually in its own slot.
  • the slot 12 has one side (on the right in the drawings) with a flat surface 16 for pressing against the knife 13 and, at the internal end of said surface, a shoulder 17 for the support and radial positioning of said knife 13.
  • the latter has at least one reference and safety pin 18, jutting out from the flat support surface 16 and into a slotted hole 19 in the knife 13.
  • the knife may be equipped with a pair of parallel slotted holes for a corresponding number of reference and safety pins. Furthermore, in certain cases, especially with knives of small dimension, one single hole may accommodate two reference pins for the centering and anti-rotation of the knife.
  • the slot 12 has a recess 20 that is angled with respect to the flat support surface 16 of the knife 13, and facing in the opposite direction (backwards) to that of the rotation of the milling machine. More specifically, said recess 20 defines an undercut 21, angled inwards below the shoulder 17, forming an obtuse angle with the support surface 16 of the knife.
  • the blocking pin 14 has a top part 22 with a front surface 22' for supporting and blocking the knife 13 and a lower angled portion 23 which extends into the angled recess 20 and terminates in a heel 23' that acts as fulcrum and support against the inclined undercut 21 of said recess.
  • the tightening screw 15 passes through a hole 24 in the milling body 11 in a perpendicular direction to the support surface 16 of the knife 13, below the shoulder 17, that is, at the level of the bottom recess 20.
  • This tightening screw 15 turns in a threaded hole 25, situated in the lower part 23 of the blocking pin 14, in such a way as to block the latter against the knife 13 and against the inclined undercut 21.
  • the support of the portion 22 of the blocking pin 14 for the knife 13 ensures that the latter is secure against the tipping moment when the tool is in operation.
  • the interaction of the heel 23' of the blocking pin 14 with the inclined undercut effectively resists the centrifugal force to which the knife 14 is subjected when the milling machine rotates.
  • the presence of the centrifugal force, with the blocking pin's tendency to move outwards from the milling body, is a favourable condition since it blocks the knife even more securely to the rest of the machine.
  • the blocking pin 14 starts to act as a lever with its fulcrum at the level of its heel 23', and with the tendency of the pin to rotate with its upper part 22 towards the knife.
  • the fulcrum heel 23' begins to rise along the inclined undercut 21, causing this rotation of the blocking pin towards the knife.
  • the shape of the slot 12, particularly the deep recess 20 and, correspondingly, the blocking pin 14, which works as a lever because of the centrifugal force, guarantee the hold on the knife, above all, with the added advantage of minimal obstruction at the base of the pin.
  • the fulcrum of the blocking pin represented by its heel 23', moves away from the centre of the milling machine, which means that the recess can be shallower and, without reducing the size of the knife, it is possible to build milling machines with a smaller external diameter.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Milling Processes (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Scissors And Nippers (AREA)
  • Adjustment And Processing Of Grains (AREA)
  • Milling, Drilling, And Turning Of Wood (AREA)
EP99830775A 1998-12-23 1999-12-15 Blocking device for a cutting insert on a milling machine Expired - Lifetime EP1013385B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998BS000098U IT244590Y1 (it) 1998-12-23 1998-12-23 Dispositivo di bloccaggio di un inserto tagliente su un corpo fresa.
ITBS980098U 1998-12-23

Publications (2)

Publication Number Publication Date
EP1013385A1 EP1013385A1 (en) 2000-06-28
EP1013385B1 true EP1013385B1 (en) 2006-09-27

Family

ID=11346262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99830775A Expired - Lifetime EP1013385B1 (en) 1998-12-23 1999-12-15 Blocking device for a cutting insert on a milling machine

Country Status (7)

Country Link
EP (1) EP1013385B1 (da)
AT (1) ATE340680T1 (da)
DE (1) DE69933354T2 (da)
DK (1) DK1013385T3 (da)
ES (1) ES2274612T3 (da)
IT (1) IT244590Y1 (da)
PT (1) PT1013385E (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5213571B2 (da) * 1974-05-20 1977-04-15
EP1574308A3 (en) * 2004-03-09 2005-11-16 STARK S.p.A. Milling tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1785151A (en) * 1929-05-20 1930-12-16 Charles B Sprague Knife-holding means for chipping machines
IT1225109B (it) * 1988-06-07 1990-11-02 Vebi Di Biason G & C S N C Dispositivo per il fissaggio amovibile di coltelli in metallo duro su teste rotanti per la lavorazione di legno o materiali simili.
DE9210363U1 (de) * 1992-08-03 1993-01-21 Gebr. Leitz Gmbh & Co, 7082 Oberkochen Messerkopf, insbesondere Profilmesserkopf

Also Published As

Publication number Publication date
PT1013385E (pt) 2006-12-29
EP1013385A1 (en) 2000-06-28
DK1013385T3 (da) 2007-01-29
IT244590Y1 (it) 2002-03-12
DE69933354D1 (de) 2006-11-09
ITBS980098U1 (it) 2000-06-23
ES2274612T3 (es) 2007-05-16
DE69933354T2 (de) 2007-08-23
ATE340680T1 (de) 2006-10-15

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