US3842873A - Cutter head for a bark removing machine - Google Patents

Cutter head for a bark removing machine Download PDF

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Publication number
US3842873A
US3842873A US00338498A US33849873A US3842873A US 3842873 A US3842873 A US 3842873A US 00338498 A US00338498 A US 00338498A US 33849873 A US33849873 A US 33849873A US 3842873 A US3842873 A US 3842873A
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United States
Prior art keywords
cutter head
cutter
blade
ring
disc
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Expired - Lifetime
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US00338498A
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English (en)
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A Valo
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Individual
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Individual
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Classifications

    • 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
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/04—Debarking or removing vestiges of branches from trees or logs; Machines therefor by rubbing the trunks in rotating drums
    • B27L1/05—Drums therefor
    • 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
    • B27L11/007—Combined with manufacturing a workpiece

Definitions

  • a cutter head for a hole-rotor type barking machine comprises a plane ring disc provided with a number of mutually spaced cutter blades projecting from the disc. Each cutter blade is provided with a guiding element forming a support surface. The support surfaces of the guiding elements form a conical surface coaxial with the ring disc. Each guiding element is supported by the ring disc along the entire length of the element and is preferably cut from a ring shaped blank of solid material.
  • the present invention relates to a cutter head for a bark removing machine including a ring-shaped holerotor through which logs to be debarked are passed longitudinally, the cutter head comprising a plane ringshaped supporting disc to be fastened at the input side of the rotor and provided with at least one, preferably several mutually spaced cutter blades projecting from the disc and each provided with a support surface associated with the blade.
  • the cutter head comprises a plane ring disc which is fastened to the hole rotor and located substantially perpendicularly to the axis of rotation of the hole rotor and to which the cutter blades are fastened each of them separately so as to project from the plane of the ring disc. Since the mesh angle of the shearing edge of the cutter blades must be positive in order to produce chips, the cutter blades, however, tend to penetrate into the wood and thereby to drive the log through the hole rotor at a rate higher than the rate of feeding at which the barking blades proper have been meant to work. This of course deteriorates the bark removing result and subjects the cutter blades to high strains.
  • a chipper in which to a solid rotatable supporting disc is fastened a plurality of radial cutter blades around the axis of rotation of the supporting disc.
  • Each blade is provided with a wing-like guide plate mounted after the blade with respect to the direction of rotation and located apart from the supporting disc, so that a space is formed between the guide plate and the supporting disc.
  • the purpose of the guide plate is to prevent the blades from cutting too deep into the wood.
  • Each guide plate is located substantially at right angles to the axis of rotation and the thickness of the guide plate decreases towards the rear edge, which is spaced from the subsequent blade, so that a radial slit for removing of the chips is formed between said rear edge and said subsequent cutter blade.
  • a disadvantage of the construction of the type described is that for the cutter heads, which, it is true, have the same diameter but which have different numbers of cutter blades, there has to be made a guide plate, which with respect to its construction and form is accurately designed especially for this number of cutter blades. As the guide plate projects freely'from the corresponding blade, each guide plate with blades becomes rather weak and light, which is of disadvantage in a cutter head.
  • a purpose of the present invention is to provide a construction that is not accompanied by the above drawbacks, and this is achieved by means of a cutter head in accordance with the invention, which is characterized in that the cutter head comprises separate, mutually spaced guiding elements fastened to the plane ring-shaped supporting disc and forming separate support surfaces located on a conical surface and facing the approaching log to be machined, said guiding elements further being separated from each other by slits in which said cutter blades are mounted and through which the chips are removed.
  • a cutter head in which the guiding elements are supported over their whole length by the supporting disc and the guiding elements can simply be cut off from a ring-shaped blank to an arcuate element of a length depending of the desired number of cutter blades in the cutter head.
  • the guiding elements solid the cutter head will get enough of weight to be able to perform the cutting action without it being necessary to fasten separate extra weights on to the cutter head or the rotor.
  • the guiding element and the cutter blade holder can also be made in one piece.
  • FIG. 1 shows a perspective view, partly in section, of a first embodiment of a cutter head in accordance with the invention
  • FIG. 2 shows a portion of the cutter head as viewed in the direction of the arrows IIII shown in FIG. 1,
  • FIG. 3 shows another embodiment of the cutter head in a way similar to that of FIG. 1,
  • FIG. 4 axially from the front shows a ring-shaped blank for the guiding elements
  • FIG. 5 shows an axial section of the blank according to FIG. 4.
  • the cutter head ll shown in the drawings is designed so as to be fastened to the hole rotor 2, shown in broken lines, of the bark removing machine on its input side in respect of the direction of input A of the log to be barked.
  • the cutter head comprises a plane ring disc 3 which supports several cutter blades 4..
  • Each cutter blade comprises a blade holder 5 fastened to the ring disc 3, to the groove 6 of which holder the blade proper 7 can be fastened so that the shearing edge 8. of the blade forms an angle a with respect of the plane of the ring disc (FIG. 1).
  • the purpose of the angular position of the shearing edge 8 of blades 4 is to trim down the thick sections knot projections etc. referred to above by cutting chips therefrom at an angle to wood fiber direction, and thus prepare the periphery of the log for the main debarking operation.
  • the cutter head 1 moreover includes for each cutter blade, a disc-like guiding element 9 following the blade in respect of the direction B of rotation, which constitutes a curved support surface 10, which is arranged at angle B in relation to the ring disc plane, substantially equal to the angle a formed by the shearing edge 8 of the blade. Between the support surface 10 and the shearing edge 8 there is, however, in the axial direction, a difference in elevation 11, which difference corresponds to the length of the chip removed by the cutter head.
  • the guiding element 9 is provided with an edge flange 12, and an end flange 15, by means of which the guiding element is fastened to the plane ring disc 3.
  • the guiding element is not at all in contact with the cutter blade, but there is a space 13 between them, and in the direction of rotation the guide wing does not extend until the next cutter blade but there is a slit 14 between them.
  • the cutter head 16 is provided with a somewhat different guiding element 17, which also comprises a curved support surface 18 but which is made of a solid material over its whole length.
  • the guiding element is provided with a cutter blade holder 19 for a cutter blade 20.
  • the log When the log is being fed through the rotating rotor and when the cutter blades are cutting excessively thick portions of the log, the log is all the time being pressed against the support surface of the guiding elements so that the log cannot rush forward but proceeds under full controll and evenly at the rate of cutting of the blades through the rotor.
  • the chips removed by the cutter blades are admitted through the slits 14 between the blades and the guiding elements to be thrown out of the cutter head.
  • the guiding element forms an almost complete circle, however, leaving again a slit 14 between the end of the wing and the blade.
  • the blade 7 (FIG. 2) of the cutter blade can be adjusted in its groove by means of adjusting screws 21 so that the difference in elevation of the shearing edge of the blade in relation to the support surface of the guiding element can be adjusted to the desired level in connection with grinding of the blade or with changing of the length of the chip.
  • a cutter head for a bark removing machine having a ring-shaped hole-rotor through which logs to be debarked are passed longitudinally, the cutter head comprising a plane ring-shaped supporting disc to be fastened at the input side of the rotor and provided with at least one and preferably several mutually spaced cutter blades projecting from the disc, each being provided with a support surface associated with the blade, characterized in that the cutter head comprises separate, mutually spaced guiding elements fastened to the plane ring-shaped supporting disc and forming separate support surfaces located on a conical surface and facing the approaching log to be debarked, said guiding elements further being separated from each other by slits in which said cutter blades are mounted and through which the chips are removed.
  • each guiding element at least with respect to the direction of rotation, is fastened at its rear edge by means of an end flange and at its inner circumferential edge by means of an edge flange to said ringshaped supporting disc.
  • a cutter head in accordance with claim 1 characterized in that a space is formed between the guiding element and the corresponding cutter blade.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Milling, Drilling, And Turning Of Wood (AREA)
  • Crushing And Pulverization Processes (AREA)
US00338498A 1972-03-09 1973-03-06 Cutter head for a bark removing machine Expired - Lifetime US3842873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI629/72A FI56134C (fi) 1972-03-09 1972-03-09 Fraeshuvud foer en barkningsmaskin av haolrotortyp

Publications (1)

Publication Number Publication Date
US3842873A true US3842873A (en) 1974-10-22

Family

ID=8504398

Family Applications (1)

Application Number Title Priority Date Filing Date
US00338498A Expired - Lifetime US3842873A (en) 1972-03-09 1973-03-06 Cutter head for a bark removing machine

Country Status (8)

Country Link
US (1) US3842873A (xx)
CA (1) CA987089A (xx)
DD (1) DD103187A5 (xx)
FI (1) FI56134C (xx)
IT (1) IT980521B (xx)
NO (1) NO139312C (xx)
SE (1) SE413476B (xx)
SU (1) SU510139A3 (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159083A (en) * 1976-04-15 1979-06-26 Domtar Inc. Debris separating chipper
US4225274A (en) * 1978-04-26 1980-09-30 Ledermann Gmbh & Co. Drilling tool
US4269244A (en) * 1978-07-13 1981-05-26 Schurman Machine Works, Inc. Rotary chipping head
EP1275460A1 (de) * 2001-07-10 2003-01-15 Ake Knebel GmbH & Co. Kreissägeblatt mit Räumschneiden
US20030070728A1 (en) * 2001-10-11 2003-04-17 Iggesund Tools Ab Adjustable wood processing device and method of adjusting the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159083A (en) * 1976-04-15 1979-06-26 Domtar Inc. Debris separating chipper
US4225274A (en) * 1978-04-26 1980-09-30 Ledermann Gmbh & Co. Drilling tool
US4269244A (en) * 1978-07-13 1981-05-26 Schurman Machine Works, Inc. Rotary chipping head
EP1275460A1 (de) * 2001-07-10 2003-01-15 Ake Knebel GmbH & Co. Kreissägeblatt mit Räumschneiden
US20030070728A1 (en) * 2001-10-11 2003-04-17 Iggesund Tools Ab Adjustable wood processing device and method of adjusting the same
US6938656B2 (en) 2001-10-11 2005-09-06 Iggesund Tools Ab Adjustable wood processing device and method of adjusting the same

Also Published As

Publication number Publication date
SU510139A3 (ru) 1976-04-05
NO139312C (no) 1979-02-14
IT980521B (it) 1974-10-10
FI56134C (fi) 1979-12-10
NO139312B (no) 1978-11-06
SE413476B (sv) 1980-06-02
DE2311790B2 (de) 1975-11-20
CA987089A (en) 1976-04-13
FI56134B (fi) 1979-08-31
DD103187A5 (xx) 1974-01-12
DE2311790A1 (de) 1973-09-13

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