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
  • B27L5/00—Manufacture of veneer ; Preparatory processing therefor
  • B27L5/02—Cutting strips from a rotating trunk or piece; Veneer lathes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27D—WORKING VENEER OR PLYWOOD
  • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
  • B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting

Definitions

• the invention relates to a veneer peeling device with a storage rack for rotatably supporting a round timber, an adjustable against the circumference of the round wood paring knife and at least one milling head for shanks of at least one edge of the veneer.
• the roundwood in the storage rack is driven to rotate about its longitudinal axis, and with the help of the peeling knife, a veneer sheet is continuously peeled off the circumference of the roundwood. Since the radius of the round wood decreases, the paring knife is tracked in the radial direction.
• the peeled veneers produced in this way are used, for example, for the production of laminated veneer lumber.
• the veneer sheet is divided after peeling into individual sheets, which are then dried and glued and then placed on a so-called book on top of each other and glued together.
• the book is an endless strand of several layers of veneer sheets, in which the joints between the individual sheets are offset from one another in relation to each other.
• the veneer panels are used in the Book laid so that the belonging to the same location panels overlap each other in a border zone.
• the veneer panels are placed in the peripheral zones, ie they are machined by sawing or milling to obtain a wedge-shaped cross-section so that their thickness in the peripheral areas Edge zone to the edge decreases linearly to zero.
• the veneer sheets are only sold after drying.
• the dried veneer is relatively hard and therefore difficult to work.
• relatively hard woods such as beech, it comes with the shanks to irregularities and material outbreaks, so that you get an irregular and heavily frayed veneer edge.
• a veneer peeling device of the type mentioned in which a milling head for shanks of the veneer is directly integrated, so that a so-called wet-Schäftung before, during or immediately after the peeling process and in any case before drying can be performed ,
• the object of the invention is to provide a veneer peeling device which allows easier - re and more precise further processing of the veneers.
• the milling head has a groove cutter for trimming the veneer.
• the veneer is not only busy with the help of the milling head, but also trimmed, that is, instead of letting the thickness of the veneer run to the edge down to zero, a seam on the outermost edge of the veneer is cut off, so that at the edge a smooth and clean butt edge is obtained whose width is less than the thickness of the veneer, but greater than zero.
• the groove made with the groove cutter separates the seam from the rest of the veneer, so that a flank of this groove forms the aforementioned butt edge.
• the veneer thus receives at least on one side a straight, hardly frayed and therefore well-defined edge, which can be precisely detected with suitable sensors and also can serve as a contact edge for aligning the veneer.
• this edge can be used to precisely align the veneer sheet in the longitudinal direction, so that then the distribution of the veneer sheet can be done in individual panels with saw cuts that run exactly perpendicular to this edge. In this way one obtains veneer sheets with an exact rectangular shape and with the same masses for all sheets, whereby the electronic process control in the further processing steps is greatly facilitated.
• the veneer sheets When laying, the veneer sheets are oriented so that the chipped edges, which initially, immediately after peeling, formed the longitudinal edges of the veneer sheet, are transverse to the longitudinal direction of the multi-ply strand forming the book.
• the trimmed and trimmed edges can then be precisely detected, making it easier to control the book reading process so as to obtain uniformly wide and precisely overlapping zones adapted to the profile of the profile.
• the machining with the milling head can take place either before or after the actual peeling process. If it takes place after the peeling process, ie when the veneer sheet is already detached from the roundwood, however, the veneer sheet must be supported by support rollers on the side opposite the milling head. If the processing takes place on round timber, in a position in the circumferential direction before the paring knife, the round timber itself serves as an abutment for the Milling head. Due to the groove made with the groove cutter the seam is not yet separated directly from the rest of the veneer, but the separation takes place only during the peeling process. Preferably, the depth of the groove is greater than the thickness of the veneer determined by the position of the peeling knife so that the seam, when peeled, is completely separated from the remainder of the veneer and falls off.
• the milling head is preferably arranged so that its axis is parallel to the longitudinal axis of the roundwood.
• the exact milling depth can be controlled by the fact that the position of the milling head is determined relative to the peripheral surface of the round wood by a sensing roller, which rolls on the circumference of the round timber.
• the sensing roller and the milling head can be arranged on a common axis.
• the follower roller then has a diameter corresponding to the smallest diameter of the total conical Fräskopfabêtes, with which the Schaftung is made.
• the milling head and the follower roller can be elastically held in contact with the roundwood, so that they automatically adapt to the gradually decreasing radius of the roundwood.
• the milling head is arranged on a pressure roller unit which presses with rotatably mounted pressure rollers on the opposite side of the paring knife against the round timber to take part of the reaction forces occurring during the peeling process.
• these pressure rollers can take over the function of the touch rollers.
• the cross-section of the roundwood may become so small that it bends under the force of the peeling knife and thereby the pressure rollers farther from the axis of the storage rack push away.
• the milling head is not affected by this positional displacement, but the milling head always its correct position in relation to the Um- catching surface at the end of the round wood reserves, it is expedient if the milling head in turn is elastically supported on the pressure roller unit.
• Figure 1 is a schematic view seen on one end of a veneer peeling device from the direction in which the peeled veneer is removed.
• Figure 2 is a section along the line II - II in Fig. 1.
• Fig. 3 is a section along the line III - III in Fig. 1; a section along the line IV - IV in Fig. 1;
• Fig. 5 is a view of parts of the device in the by an arrow V in
• Fig. 3 indicated viewing direction
• Fig. 8 is a schematic sketch for illustrating a book laying operation.
• FIG. 1 shows schematically one end of a veneer peeling device with a storage rack 10, of which here a side wall 12, a rear wall 14 and a bottom 16 are visible.
• a side wall 12 a rear wall 14 and a bottom 16 are visible.
• opposite side wall sleeves 18 are rotatably mounted, which serve for clamping a round timber 20, for example, cut to a suitable length and debarked tree trunk.
• a knife bar 22 extends with a paring knife 24, which is invisible in Fig. 1 on the back of the cutter bar 22 and of which only the cutting edge is indicated by dashed lines.
• the cutter bar is held with its opposite ends by guides 26 vertically adjustable in the storage rack 10.
• a pressure roller unit 28 is arranged, on which two sets of pressure rollers 30 are rotatably mounted.
• the pressure rollers 30 are arranged on the underside of a carrier 32, which is suspended with support arms 34 on a drive, not shown, and in the vertical direction relative to the storage rack 10 is movable. With the help of the drive, the pressure roller unit 28 is pressed against the round timber 20 so that the pressure rollers 30 roll on the circumference of the roundwood and absorb part of the force exerted by the paring knife 24 on the roundwood reaction force.
• the round timber 20 is rotated by means of a drive, not shown, which acts on the sleeves 18 and / or on the pressure rollers 30 about its longitudinal axis, while the peeling blade 24 is employed with its cutting edge against the peripheral surface of the round timber that an endless veneer sheet 36 is peeled off the roundwood.
• the veneer sheet 36 is pulled off above the bottom 16 of the storage rack, in Fig. 1 in the direction towards the viewer, which is why the veneer sheet is shown here in section.
• the support 32 is extended beyond the pressure rollers in the direction of the side wall 12, and he wears in this part a milling head unit 38 with a rotary drivable milling head 40.
• the milling head 40 has a conical Schftungstechnikmaschine 42 which widens in the direction of the side wall 12 in diameter. More precisely, the attachment tool is formed by blades, not shown in more detail, whose cutting edges lie in a common conical envelope surface. At the outer, the largest diameter end of the Shuftungswerkmaschines 42 is followed by a radially projecting Groove 44.
• the milling head 40 and an associated drive 46 are mounted on the free end of a rocker 48, the opposite, in Fig. 1 facing away from the viewer end pivotally mounted in bearing blocks 50 which project from the underside of the carrier 32.
• the rocker 48 is fork-shaped and carries on the milling head 40 opposite side of a rotatable feeler roller 52, whose axis is in extension of the axis of rotation of the milling head 40.
• the outer diameter of the follower roller 52 coincides with the smallest diameter of the conical shooting tool 42.
• the carrier 32 forms a parallel to the rocker protruding tongue, and between the free end of this tongue and the free end of the rocker 48, a compression spring 54 is arranged, which biases the milling head unit 38 down and so the feeler roller 52 and the Milling head 40 holds on the peripheral surface of the round timber 20 in Appendix.
• a groove 56 is milled through the groove milling cutter 44 at a small distance from the end of the roundwood 20, and a conical casting zone 58 adjoins the inner edge of this groove, which runs out in the peripheral surface of the roundwood and is produced with the aid of the setting tool 42 ,
• Fig. 2 the paring knife 24 can be seen in cross section.
• the sectional plane of the drawing is equal to the groove 56, so that one looks at the end face of the milling head 40, which is formed by the Nutfräser 44.
• Both the round timber 20 and the milling head 40 rotate in Fig. 2 in the counterclockwise direction.
• a pivot bearing 62 with one end of the rocker 48 is mounted in the bearing blocks 50.
• the cutting plane passes through the rocker 48, and it can be seen the arm of the rocker, which carries the sensing roller 52.
• the arrangement of the spring 54 relative to the pivot bearing 62 can be seen here.
• the spring 54 is a helical compression spring, which exerts a torque on the rocker 48 in the tensioned state, so that the follower roller 52 and the milling head are pressed against the round timber 20.
• Fig. 4 shows the arrangement of the pressure rollers 30 of the pressure roller unit 28 on both sides of the apex of the round timber 20th
• the paring knife 24 must be moved upwardly while the pressure roller unit 28 moves down to the same extent so that the pressure rollers 30 engage the peripheral surface of the roundwood 20 stay in plant. This also preserves the correct positioning of the milling head unit 38 with respect to the roundwood 20.
• two milling head units 38 are provided in mirror image at opposite ends of the carrier 32, and both are tracked together with the pressure roller unit 20 in accordance with the decreasing radius of the roundwood.
• the diameter of the round timber 20 has decreased to a very small value, however, it may happen that the counter-pressure force generated by the pressure rollers 30, which counteracts the force of the peeling knife 24, is no longer sufficient, so that the round timber bent in the middle region upwards becomes. Since then the pressure roller unit 28 deviates upward while the ends of the round wood remain clamped in the same position in the sleeves 18, the distance between the milling head 40 and the circumference of the round wood would increase. However, this effect is compensated for by the fact that the springs 54 hold the milling head units in contact with the respective end of the roundwood.
• Fig. 5 the round timber 20 and the milling head unit 38 are shown in a view in which one looks tangentially to the point of contact, at which the milling head 40 and the sensing roller 52 abut the circumference of the roundwood. It can be seen more clearly here, as the milling head 40 generates the profile of the groove 56 and the Schftungszone 58.
• FIG. 6 the machined with the milling head end of the roundwood 20 is shown in an enlarged scale.
• a dot-dash line 64 indicates the radial position of the peeling blade and, accordingly, the thickness of the peeled veneer sheet 36, which is shown separately in Fig. 7 again.
• FIG. 8 shows a book laying process in the form of a schematic diagram in which veneer sheets 66, which have been produced by dividing the veneer sheet 36, are laid on a conveyor 70 in a plurality of layers by means of a stacking device 68.
• the veneer Fine 66 form an endless strand which extends in the longitudinal direction of the conveyor 70.
• the panels are oriented so that the edges are transverse to the conveyor's direction of travel, that is, in the direction perpendicular to the plane of the drawing in Fig. 8.
• the panels belonging to the same layer are placed together so that their edges are exactly overlap with their keying zones 58 so that the thicknesses of the overlapping veneer sheets complement each other to the total thickness of the veneer (with the exception of negligible small "gaps" at the butt edges 60).
• the joints between the veneer sheets 66 of the various layers are offset relative to one another in the running direction of the conveyor 70. Because the milling heads 40 at the opposite ends of the storage rack 10 are both on the same side (outside) of the peeled veneer sheet, the stitching zones 58 at the opposite edges of the veneer sheets 66 in Figure 8 would not actually be complementary, but mirror images of each other. However, since the veneer is very thin and flexible, the shingles are each bent down upon application of the next higher layer so that they rest flat on the next lower layer or conveyor 70 and assume a complementary shape to the sheath zone of the laid board.
• the veneer panels 66 have obtained a clean and straight abutment edge 60 by trimming in the above-described peeling process, this edge can be precisely recognized, for example, with the aid of an optical sensor 72. This allows the stacking device 68 to be controlled electronically so that each veneer board is correctly stored in the correct position.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Manufacture Of Wood Veneers (AREA)

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• 2015
  • 2015-05-16 DE DE202015102518.1U patent/DE202015102518U1/de not_active Expired - Lifetime
• 2016
  • 2016-05-09 PL PL16720868T patent/PL3297800T3/pl unknown
  • 2016-05-09 EP EP16720868.5A patent/EP3297800B1/fr active Active
  • 2016-05-09 CA CA2985878A patent/CA2985878C/fr active Active
  • 2016-05-09 WO PCT/EP2016/060301 patent/WO2016184710A1/fr not_active Ceased
  • 2016-05-09 US US15/574,286 patent/US10493652B2/en active Active

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