EP0440151B1 - Verfahren zum Anflachen von Baumstämmen - Google Patents

Verfahren zum Anflachen von Baumstämmen Download PDF

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Publication number
EP0440151B1
EP0440151B1 EP19910101103 EP91101103A EP0440151B1 EP 0440151 B1 EP0440151 B1 EP 0440151B1 EP 19910101103 EP19910101103 EP 19910101103 EP 91101103 A EP91101103 A EP 91101103A EP 0440151 B1 EP0440151 B1 EP 0440151B1
Authority
EP
European Patent Office
Prior art keywords
reference plane
point
logs
log
butt end
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
EP19910101103
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0440151A3 (en
EP0440151A2 (de
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.)
Wurster u Dietz GmbH u Co Maschinenfabrik
Original Assignee
Wurster u Dietz GmbH u Co Maschinenfabrik
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 Wurster u Dietz GmbH u Co Maschinenfabrik filed Critical Wurster u Dietz GmbH u Co Maschinenfabrik
Publication of EP0440151A2 publication Critical patent/EP0440151A2/de
Publication of EP0440151A3 publication Critical patent/EP0440151A3/de
Application granted granted Critical
Publication of EP0440151B1 publication Critical patent/EP0440151B1/de
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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B27B1/007—Methods for subdividing trunks or logs essentially involving sawing taking into account geometric properties of the trunks or logs to be sawn, e.g. curvature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
    • B27C1/00—Machines for producing flat surfaces, e.g. by rotary cutters; Equipment therefor
    • B27C1/02—Smoothing, i.e. working one side only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/525—Operation controlled by detector means responsive to work
    • Y10T83/536—Movement of work controlled

Definitions

  • the invention relates to a method for flattening tree trunks with a curved longitudinal center line, in which the tree trunks are conveyed in the lying position with their convex side up and their concave side down in the longitudinal direction and flattened on the concave side in the region of an earth end from below and before are measured in a position in which they lie only at end points of the concave side on a reference plane, the position of a first point of the tree trunk being determined after it has been raised above the reference plane, and the tree trunks on the end point facing away from the end of the earth when the end of the earth is continuously supported the reference plane at the end of the earth is lowered so far that the first point lies in a predetermined plane, and the tree trunks are flattened in this lowered position up to the reference plane.
  • a method and a device of the type mentioned above are known from DE-OS 37 30 865.
  • tree trunks that are to be processed into finished products such as squared timber, boards and the like in sawmill systems have grown strictly straight only in exceptional cases due to natural conditions.
  • the tree trunks supplied generally have a curved longitudinal center line, so that this odd growth form must be taken into account when processing the tree trunks in order to obtain an optimal wood yield.
  • Another possible source of error in such tree trunks is the shape of the so-called earth end, i.e. the thickening of the trunk in the transition to the root area.
  • Tree trunks are sawn off as close to the ground as possible for the sake of optimal yield, so that a considerable proportion of the tree trunk length, for example one meter, widens conically progressively and thus has a considerably larger cross-section than the otherwise more or less regularly tapered rest Tree trunk. If such a tree trunk with the end of the earth now lies on a flat contact surface of a conventional transport device for sawmill systems, it would also lie very obliquely even with the longitudinal center line that would otherwise run straight, because the end of the earth with its much larger diameter allows the thicker end of the tree to stand up.
  • the end of the earth is flattened on one side on the concavely curved side of the tree trunk, so that the tree trunk comes to a flatter support on a conveyor and therefore a better timber yield is achieved.
  • the tree trunks are measured before flattening in such a way that the position of the first point on the concave side is determined as the point of greatest deflection after the distance from the earthed end point and after its elevation above the reference plane becomes.
  • the tree trunk is then lowered so far at the end of the earth that the first point lies in the reference plane.
  • the invention is therefore based on the object of developing a method and a device of the type mentioned in such a way that this wish is taken into account.
  • this object is achieved according to the invention in that the first point on the convex side marks the lowest point between the highest elevation and the end of the earth, and in that the predetermined plane lies at a height above the reference plane which corresponds to the diameter of the tree trunk at the end facing away from the earth.
  • the object on which the invention is based is completely achieved in this way because the abovementioned measures apply to a large number of Tree types and also with certain types of tree growth enable an even higher wood yield than is the case with the method mentioned at the beginning.
  • the method according to the invention has the advantage that it is easier to carry out in practice because only two diameters have to be determined.
  • Fig. 1 designates a tree trunk of natural growth, the longitudinal center line 10a of which is curved.
  • the tree trunk 10 is arranged horizontally so that a convexly curved side 11 lies at the top and a concave curved side 12 lies at the bottom. In this position, the tree trunk 10 lies on a reference plane designated 13, which can be, for example, an upper level of a conveying device of a sawmill system.
  • the thinner end of the tree trunk 10 on the left in FIG. 1 has a first point 20 and a second point 21 as end points of the thinner end and the diameter of the tree trunk 10 at the thinner end is denoted by d o .
  • the tree trunk 10 lies with a third point 22 on the reference plane 13.
  • a fourth point 23 marks the point of highest elevation on the convex side 11 of the tree trunk 10.
  • a fifth point 26 marks the lowest point on the convex side 11 between the fourth point 23 of the highest elevation and the end of the earth 27.
  • the height of the tree trunk 10 in the fifth Point 26 is denoted by h.
  • the measured values d o and h can be determined using measuring devices known per se, as will be explained further below with reference to FIGS. 3 to 5.
  • the tree trunk 10 In order to pre-process the tree trunk 10 in a manner that enables subsequent processing with optimum wood yield, the tree trunk 10 should now, as shown in FIG. 2 in detail, be lowered into a position in which the thinner end of the tree trunk 10 matches the first Point 20 on the reference plane 13 remains that the thicker end of the tree trunk 10 is, however, lowered so far with the earth end 27 that the fifth point 26 on the convex side 11 comes to lie at the height of the second point 21 above the reference plane 13.
  • a lowering value A is determined from the previously determined measured variables do and h which corresponds to the relationship: obey.
  • the tree trunk 10 is lowered approximately in the radial plane, which is defined by the fifth point 26, ie approximately in the region of the transition from the earth end 27 to the remaining tree trunk 10.
  • the tree trunk 10 arrives from its starting position shown in dashed lines there, which corresponds to that of FIG. 1, into its end position drawn in solid lines.
  • the seventh point 26 becomes 26 ′ and comes to lie above the reference plane 13 at the height do.
  • the tree trunk flattened in this way now has an optimal contour in the horizontal direction for subsequent processing from the point of view of the best possible use of space.
  • the subsequent processing can e.g. consist in a manner known per se that the flattened tree trunk 10 is now also flattened on the remaining 3 sides and then side boards or squared timber are separated from the flattened sides.
  • 40 designates a first conveyor device, for example a conveyor belt, on which the Tree trunk 10 in Fig. 3 is promoted from left to right.
  • the earth end 27 is conveyed ahead in the conveying direction, but this does not have to be the case, because even with a corresponding adaptation of the elements to be explained below, conveying the tree trunk 10 with the thin end ahead would also be possible without further ado.
  • the tree trunk 10 passes through a light curtain 41 on its way in the first conveyor device 40, as will be explained further below with reference to FIGS. 4 and 5.
  • the light curtain 41 is connected to a control unit 42, so that all the characteristic values do, di and d max already explained for FIG. 1 are supplied to the control unit 42.
  • the control unit 42 determines the lowering value A from these input values and uses it to control a lifting device 43 which grips the tree trunk 10 in the region of the end of the earth.
  • the tree trunk 10 'cantilever after leaving the first conveyor 40 with its earth end 27, so that the earth end 27' can be lowered by the lowering amount A when the thin end of the tree trunk 10 'is continuously supported.
  • the area 30 thus reaches below the reference plane 13 and can be removed by means of a milling cutter 44 or another suitable tool. It goes without saying that instead of the lifting device 43 acting from above and drawn in in FIG. 3, a lifting device 43 'acting from below can also be used in order to lower the earth end 27' in the manner described.
  • the flattened tree trunk 10 "then arrives at a second conveyor 45, from which it is fed to further processing stations, e.g. further flat milling cutters, corner milling cutters, cut-off and cross-cut saws and the like, as is known per se.
  • further processing stations e.g. further flat milling cutters, corner milling cutters, cut-off and cross-cut saws and the like, as is known per se.
  • the light curtain 41 preferably consists of a rectangular frame which surrounds the first conveying device 40 on all sides.
  • light transmitters 50 are attached, on which light receivers 51, e.g. Facing photodiodes or the like.
  • a curtain of light rays 52 is created, i.e. several, horizontally aligned and arranged one above the other, which are more or less interrupted by the contour of the trunk 10. 5 clearly shows that in this way the contour of the tree trunk 10 can also be detected in the region of the convex side 12 without contact.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Sorting Of Articles (AREA)
EP19910101103 1990-02-02 1991-01-29 Verfahren zum Anflachen von Baumstämmen Expired - Lifetime EP0440151B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904003023 DE4003023C1 (enrdf_load_stackoverflow) 1990-02-02 1990-02-02
DE4003023 1990-02-02

Publications (3)

Publication Number Publication Date
EP0440151A2 EP0440151A2 (de) 1991-08-07
EP0440151A3 EP0440151A3 (en) 1992-04-08
EP0440151B1 true EP0440151B1 (de) 1994-10-05

Family

ID=6399244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910101103 Expired - Lifetime EP0440151B1 (de) 1990-02-02 1991-01-29 Verfahren zum Anflachen von Baumstämmen

Country Status (5)

Country Link
US (1) US5111862A (enrdf_load_stackoverflow)
EP (1) EP0440151B1 (enrdf_load_stackoverflow)
AT (1) ATE112515T1 (enrdf_load_stackoverflow)
CA (1) CA2035310C (enrdf_load_stackoverflow)
DE (2) DE4003023C1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10342903B4 (de) * 2003-09-17 2006-03-09 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Streugutbunker mit einer Austragsvorrichtung zum Streuen von Streugut
DE102004037268A1 (de) * 2004-07-31 2006-03-23 Hollmann Sondermaschinen Gmbh Verfahren zum Vermessen von langgestreckten Hölzern oder Holzelementen sowie Vorrichtung zum Durchführen dieses Verfahrens
CA2545787C (en) 2005-05-05 2009-07-14 Centre De Recherche Industrielle Du Quebec System and method of monitoring the quality of cutting

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456774A (en) * 1967-05-02 1969-07-22 Weyerhaeuser Co Method and apparatus for aligning and transferring logs
CA1018868A (en) * 1975-11-26 1977-10-11 Macmillan Bloedel Limited Method and apparatus for aligning logs
FI67317C (fi) * 1980-11-14 1985-03-11 Ahlstroem Oy Anordning foer inriktning av ett saogvarustycke i synnerhet et block
DE3244393C1 (de) * 1982-12-01 1984-03-01 Wurster u. Dietz GmbH u. Co Maschinenfabrik, 7400 Tübingen Verfahren zum Herstellen von allseitig bearbeiteten Holzerzeugnissen sowie Vorrichtung zur Durchfuehrung des Verfahrens
DE3419212C1 (de) * 1984-05-23 1988-11-10 Jenkner, Erwin, 7261 Gechingen Verfahren zum Besaeumen und Aufteilen von Brettern mit Rohkanten,wie Waldkanten,und Einrichtung zur Durchfuehrung des Verfahrens
FR2602993A1 (fr) * 1986-08-22 1988-02-26 Bocquet Expl Bureau Etu Indles Procede et dispositif pour la mesure et le positionnement d'une piece de bois dans une machine a bois du type deligneuse
US4839816A (en) * 1987-06-02 1989-06-13 Cattrall Thomas J Lumber cutting system
US4774988A (en) * 1987-09-11 1988-10-04 Weyerhaeuser Company Method for measuring edge profile of an elongated member
DE3730865A1 (de) * 1987-09-15 1989-03-30 Wurster & Dietz Maschf Verfahren zum anflachen von baumstaemmen und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
ATE112515T1 (de) 1994-10-15
US5111862A (en) 1992-05-12
CA2035310A1 (en) 1991-08-03
CA2035310C (en) 1994-10-04
DE59103142D1 (de) 1994-11-10
DE4003023C1 (enrdf_load_stackoverflow) 1991-09-05
EP0440151A3 (en) 1992-04-08
EP0440151A2 (de) 1991-08-07

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