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
  • B27L5/002—Wood or veneer transporting devices
• • 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
  • B27L5/06—Cutting strips from a stationarily- held trunk or piece by a rocking knife carrier, or from rocking trunk or piece by a stationarily-held knife carrier; Veneer- cutting machines
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
  • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching

Definitions

• the invention relates to a device for cutting wood lamellae without cutting from a square timber with a feed device which presses the square timber against an opposite wooden guide surface and conveys it in its longitudinal direction, and with a knife, the cutting edge of which runs obliquely at an angle to the conveying direction of the square timber and in one of the Thickness of the wooden lamella to be cut is parallel to the wooden guide surface.
• wood lamellae wood lamellae
• wood lamellae wood lamellae
• these wooden slats can also be called boards.
• a square timber or a beam preferably machined on all sides, is moved in its longitudinal direction along a timber guiding surface.
• this is the wooden guide surface arranged horizontally and the squared timber is pressed against the timber guide surface from above by the feed device.
• the feed device is usually an endlessly rotating, driven conveyor belt.
• the knife separating the wooden slats is arranged on the wooden guide surface in such a way that its cutting edge is at a distance from the wooden guide surface which corresponds to the thickness of the wooden slats to be separated.
• the cutting edge runs at an angle to the longitudinal direction of the wood, which is also the conveying direction. This creates a pulling cut.
• This small cross-section can no longer take over the lateral forces to be transferred from the wooden lamella to the squared timber; therefore the wood breaks out laterally at this point, so that the cutting edges of the separated wood lamella and / or the squared timber and thus the in wooden slat to be separated in the next pass.
• the object of the invention is therefore to design a device of the type mentioned in the introduction in such a way that lateral outbreaks of the wood are avoided when the lamella is cut from the squared timber.
• a lateral guide bar is arranged on the side edge of the wooden guide surface opposite the knife, that the guide bar extends in the conveying direction at least to the cutting edge and that the upper edge of the guide bar is at least approximately at the level of the cutting edge above the wooden guide surface.
• the guide bar extends at least to the cutting edge, the side surface of the squared timber and thus also the side edge of the wooden slat is laterally supported up to the point at which the wooden slat is only connected to the squared timber with a very small cross section. Since the lateral forces occurring due to the inclined cutting edge are fully supported and therefore no such lateral or transverse forces are transmitted between the wooden lamella and the squared timber, the wood does not break out at this point.
• the separated wooden lamella has an undamaged cutting edge, and the squared timber also has a clean, undamaged cutting edge, which then forms the cutting edge of the wooden lamella to be subsequently cut off.
• the feed device can be of simpler design. Since the lateral forces caused by the inclined position of the cutting edge no longer have to be absorbed by the feed device, the feed device can be of simpler design. Since the lateral forces no longer have a disruptive effect, the cutting edge can be arranged at a relatively small angle of preferably 10 to 30 ° to the conveying direction and thus to the direction of the guide bar. As a result, a predominantly pulling cut is achieved, which is favorable for the cutting quality that can be achieved and with regard to the required feed forces.
• a "pulling cut” is understood to mean a cutting process in which the feed direction is not perpendicular to the cutting edge but at an angle to it, ie the feed movement has a component of motion parallel to the cutting edge.
• the guide bar - seen against the conveying direction - projects beyond the knife. This ensures that not only is the cutting edge of the wooden lamella to be separated laterally supported in full height, but also that there is additional lateral support for the squared timber remaining after the wooden lamella has been cut off.
• the guide bar preferably ends at the cutting edge with its front end in the conveying direction.
• the upper edge of the guide bar is at a distance from the wooden guide surface, which is 1.2 to 1.7 times the distance from the cutting edge to the wooden guide surface.
• FIG. 1 is a greatly simplified side view of a device for cutting wood slats from a square timber without cutting
• Fig. 2 is an enlarged plan view of the wooden guide surface of the device of FIG. 1 with the knife and
• the device shown in greatly simplified form in a side view in FIG. 1 is used, from a squared timber 1, which is fed in the direction of arrow 2 (ie from right to left in FIG. 1), on the underside in each case of a wooden lamella 3 using non-cutting technology to cut off.
• a feed device 4 has an endlessly circulating belt 5 which is driven and runs over deflection rollers 6 and 7.
• the belt 5 is pressed against the top of the squared timber 1 by several pressure rollers 8 and takes the squared timber 1 along in its longitudinal direction. As a result, the conveying direction of the squared timber 1 is determined.
• a knife 10 is arranged on the wood guiding surface 9, the cutting edge 11 of which is arranged at an acute angle a to the longitudinal direction of the wood and thus to the conveying direction.
• the cutting edge 11 lies at a distance approximately corresponding to the thickness of the wooden lamella 3 to be cut above the wooden guide surface 9 and parallel to it.
• a counter pressure bar 12 Arranged below the cutting edge 11 is a counter pressure bar 12, the pressure edge 13 of which runs parallel to the cutting edge 11 and presses against the wooden lamella 3 to be separated from below in order to achieve a clean cut.
• the counter pressure bar 12 essentially prevents a tear from running ahead of the cutting edge 11. As indicated in FIG. 3, both the knife and the counter pressure bar 12 are adjustable.
• a lateral guide bar 14 is arranged, which extends in the longitudinal direction of the squared timber 1 and thus in the conveying direction essentially over the entire length of the knife 10. Seen opposite to the conveying direction 2, the guide bar projects over the knife 10. With its other end, which is at the front in the conveying direction, the guide bar 14 ends directly at the cutting edge 11.
• the upper edge 14b of the lateral guide bar 14 is at a distance from the wooden guide surface 9 which is slightly larger than the distance of the cutting edge 11 to the wooden guide surface 9; it is preferably 1.2 to 1.7 times.
• the guide bar 14 is received in a form-fitting manner in a longitudinal groove 15 of the wooden guide surface 9.
• the guide bar 14 forms an acute angle a with the cutting edge 11, which is in the range from 10 to 30 °.
• the lateral forces or transverse forces that occur during cutting, which act on the square timber 1 and on the separated wooden lamella 3, are very large compared to the feed force, depending on the size of the angle a of the knife 10. These lateral forces are completely absorbed by the lateral guide bar 14, in particular up to the point 16 (FIG. 2) at which the cutting edge 11 and the surface 14c of the guide bar 14 facing the square timber 1 converge.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=6414592

Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (6)

Citations (7)

• 1990
  • 1990-09-20 DE DE19904029752 patent/DE4029752C1/de not_active Expired - Fee Related
• 1991
  • 1991-08-02 WO PCT/EP1991/001457 patent/WO1992005020A1/de unknown

Patent Citations (7)

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