EP0126749B1 - Machine for removing thickened root portions on logs - Google Patents

Machine for removing thickened root portions on logs Download PDF

Info

Publication number
EP0126749B1
EP0126749B1 EP83903828A EP83903828A EP0126749B1 EP 0126749 B1 EP0126749 B1 EP 0126749B1 EP 83903828 A EP83903828 A EP 83903828A EP 83903828 A EP83903828 A EP 83903828A EP 0126749 B1 EP0126749 B1 EP 0126749B1
Authority
EP
European Patent Office
Prior art keywords
log
holding
cutter unit
raised
lowered
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
EP83903828A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0126749A1 (en
Inventor
John Flessum
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0126749A1 publication Critical patent/EP0126749A1/en
Application granted granted Critical
Publication of EP0126749B1 publication Critical patent/EP0126749B1/en
Expired 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
    • 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
    • B27L1/10—Debarking or removing vestiges of branches from trees or logs; Machines therefor using rotatable tools

Definitions

  • the present invention relates to a machine for removing the thickened root portion on a log, and is of the type recited in the preamble of the appurtenant patent claim 1.
  • the cutter unit is then pressed upwardly against the underside of the root end of the log, which projects freely outwardly from the holding and rotating means, and as the log rotates the thickened root portion is milled off, after which the cutter unit and the holding and rotating means are lowered and the log is returned to the conveyor for further transport.
  • a new log is then led forth to the machine, and a visual or automatic inspection determines whether the new log needs to be milled off and whether the machine needs to be actuated for removing any thickened portions at the root end.
  • the object of the present invention is to provide a machine of this type in which the holding and rotating means are simplified and extend over a substantially shorter expanse than on the prior art apparatus.
  • the combined holding and rotating means may consist of an upper and a lower pair of rollers for lifting, retaining and rotating the log, the pair of rollers engaging with the log as close to the root end of the log as close to the cutter unit as possible while the top end of the log remains resting on the conveyor, which at least on a portionthereof in the vicinity of but spaced from the holding.means exhibits lateral restricting means.
  • Said lateral restricting means may be provided by designing the conveyor as a V-shaped apparatus, or by providing upwardly projecting side walls or arms which will ensure that the end of the log, during rotation, will not twist free of the conveyor in a lateral direction.
  • the cranking or twisting movement imparted to the root end of the log, when the log is curved, will be less severe that when the log is supported at two points located closer together, for example at the midportion of the log. Therefore, the cutter unit will mill off relatively less wood from the thickened root portion owing to the reduced twist or cranking movement.
  • the machine is simple to mount and install and it is compactly constructed, which makes it easy to adapt the machine to existing chain/hook conveyors for timber. It can also easily be installed on inclined timber chain conveyors, because the machine does not have to stand strictly horizontal.
  • the cutter unit is elevated such that it works against the top surface of the log, thereby providing ample space for the wood chips to accumulate beneath the machine and for the arrangement of means for removing the wood chips in the area beneath the cutter unit and the root end of the log.
  • the holding means is constructed to permit lateral or longitudinal introduction of logs into the machine. This permits very flexible placement of the machine either on new assemblies or on existing systems.
  • the machine for removing the thickened root portion of a log comprises a combined holding and rotating means 1 for receiving and lifting a log 3 up from a conveyor 2, the machine having been installed along the conveyor path.
  • the root end 3' of the log 3 projects outwardly from the holding means 1, which also rotates the log 3.
  • a cutter unit 4 adapted to be raised and lowered is disposed adjacent to the holding means 1 with its axis of rotation extending in the longitudinal direction of the log 3, for working contact against the root end 3' of the log.
  • the holding/rotating means comprises an upper member 1a and a lower member 1 b, and at least the lower member 1 is adapted to be raised and lowered for elevating the root end 3' of the log 3 into contact with the upper holder member 1a, in which position the log 3 is rotated and simultaneously milled off by the cutter unit 4, while the top end 3" of the log, which is situated farther forward in the direction of transport, remains supported by the conveyor 2.
  • the conveyor 2 is the example shown ( Figure 1) is formed with a V-shaped cross section which prevents the top end 3" of the log from twisting out of the conveyor as the log rotates in connection with the milling off of the thickened root portion.
  • the lower holder member 1b is offset in relation to the upper holder member 1a a in a direction toward the cutter unit 4. Therefore, the log 3 will slope naturally from the holder members 1a, 1 b at the root end 3' of the log downwardly to the top end 3" of the log that rests on the conveyor 2.
  • both of the holder members 1 a, 1 b can be raised and lowered in relation to each other while at the same time the holding/rotating means 1 as a unit can be raised and lowered, as mentioned above.
  • the upper and lower holder members 1a, 1b are supported on respective arms 7, 8 both of which can be raised and lowered by means of drive means 5, 6.
  • Both of the arms 7, 8 are pivotally mounted on a frame 9, and the lower arm 7 is adapted to be raised to a desired height independantly of the movement of the upper arm 8.
  • the drive means 5, 6 are pressure cylinders, i.e., a pressure cylinder 5 is arranged between the lower arm 7 and the frame 9 for raising and lowering the holding/rotating means 1, and a pressure cylinder 6 is arranged between the two arms 7, 8 for pivoting these arms and the upper and lower holder members 1a, 1b carried thereon into engagement and rotational contact against the root end 3' of the log 3.
  • the cutter unit 4 is arranged on the arm 10 that also is pivotally mounted on the frame 9, and a pressure cylinder 11 is arranged between the cutter arm 10 and the frame 9 for pivoting the cutter unit 4 into contact with and away from the root end 3' of the log 3.
  • annular stop means 4' is provided at one end of the cutter unit, at the end situated closest to the holder means 1.
  • the stop means 4' has a radius that is equal to-or larger than the radius of the cutter unit 4, so that when the stop means 4' comes into contact against a section of the log having a diameter equal to or less than the diameter of the milled root portion 3', further cutting will be prevented by the stop means coming into contact against the log surface.
  • the connections for the pressurizing medium for the pressure cylinders 5, 6, and 11 and the control panel for these are not illustrated in the drawing.
  • the machine can be actuated and operated manually, but this is preferably done automatically by means of known per se sensor means, which may be electronic and/or mechanical or optionally optical, which transmit signals to the control panel for the drive means and automatically start and stop the cylinders depending on the configuration of the log 3 passing through the machine on the conveyor 2.
  • the part of the conveyor 2 which guides the logs 3 into the machine must simultaneously be stopped or delayed to prevent the next log from entering the machine until the milling off of the root end of the preceding log has been completed and the preceding log 3 has been lowered onto the conveyor 2 and transported further.
  • the machine can be utilized in conjunction with an existing conveyor or timber chain/hook conveyor, with axial passage of the logs 3 through the machine.
  • the logs 3 can also be introduced laterally into the machine, where they are then retained and milled off before being transported out of the machine in the axial direction.
  • Figure 1 shows a motor 12 mounted on the arm 10 of the cutter unit 4, whose drive disk via a V-belt or chain 12' is connected to a corresponding disk 4' on the cutter unit 4.
  • the holder members la, 1b on the holding/ rotating means 1 may for example be provided by pairs of rollers which are brought into contact against the top and bottom surfaces of the log 3 for retaining and rotating the log when the arms 7, 8 have been pivoted toward each other for retaining and rotating the log and for raising the log up from the conveyor 2.
  • One or both pairs of rollers can be driven by a motor for rotating the log, but in the illustrated example in Figure 1 only one motor 13 is shown on the lower arm 7, with a belt or chain drive 13' connected to the rollers for turning them.
  • rollers on the holder members 1a, 1b constitute one practical way of forming these members, but other forms that are suitable for retaining and imparting rotation to the log 3 could also be utilized without departing from the scope of the present invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Specific Conveyance Elements (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
EP83903828A 1982-11-30 1983-11-29 Machine for removing thickened root portions on logs Expired EP0126749B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO824010A NO151075C (no) 1982-11-30 1982-11-30 Maskin for fjerning av rotfortykninger paa trestokker
NO824010 1982-11-30

Publications (2)

Publication Number Publication Date
EP0126749A1 EP0126749A1 (en) 1984-12-05
EP0126749B1 true EP0126749B1 (en) 1986-07-23

Family

ID=19886829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83903828A Expired EP0126749B1 (en) 1982-11-30 1983-11-29 Machine for removing thickened root portions on logs

Country Status (5)

Country Link
EP (1) EP0126749B1 (no)
DE (1) DE3364765D1 (no)
FI (1) FI79052C (no)
NO (1) NO151075C (no)
WO (1) WO1984002105A1 (no)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8503127L (sv) * 1985-06-24 1986-12-25 Arne Carlsson Rotreducerare
NL8503288A (nl) * 1985-11-27 1987-06-16 Maas Klok Inrichting voor het punten en/of kronen van palen.
DE3619114A1 (de) * 1986-06-06 1987-12-10 Friedrich Moehringer Verfahren zum reduzieren des wurzelansatzes an baumstaemmen
FI91222C (fi) * 1990-02-26 1994-06-10 Risto Korhonen Laite tukkien ja vastaavien vuolemiseksi
WO1994013442A1 (en) * 1992-12-14 1994-06-23 Telcor Pty. Ltd. Size reduction machinery
US7631748B2 (en) 2005-01-06 2009-12-15 Usnr/Kockums Cancar Company Conveyor system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642904A (en) * 1951-02-06 1953-06-23 John H Pearce Log debarker and chipper
US2901011A (en) * 1956-04-24 1959-08-25 John C Eaton Chain-type debarking flails cushioned by rubber plates coaxially mounted on a rotor shaft
US2945523A (en) * 1957-10-29 1960-07-19 Koppers Co Inc Hold-down apparatus
US3324909A (en) * 1965-02-03 1967-06-13 Mccranie Ulysses Shasta Apparatus and process for peeling logs
FR2287974A1 (fr) * 1974-10-15 1976-05-14 Vignolles Jean Claude Machine pour ecorcer les billots de bois
SE427635B (sv) * 1977-11-04 1983-04-25 Bruks Mekaniska Ab Maskin for matrialavverkande bearbetning av foretredesvis langstreckta arbetsstycken

Also Published As

Publication number Publication date
WO1984002105A1 (en) 1984-06-07
FI843003A0 (fi) 1984-07-27
FI843003A (fi) 1984-07-27
NO151075C (no) 1985-02-06
FI79052B (fi) 1989-07-31
FI79052C (fi) 1989-11-10
DE3364765D1 (en) 1986-08-28
EP0126749A1 (en) 1984-12-05
NO824010L (no) 1984-06-01
NO151075B (no) 1984-10-29

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