FR2662387A1 - PROCESS FOR PRODUCING BUILDING WOOD FROM TREE OR MODEL TRUNKS AND DEVICE FOR IMPLEMENTING THE PROCESS - Google Patents

Abstract

The invention relates to a method for producing a construction timber from tree trunks or models, and to a device for carrying out the method. To produce a timber with flat faces and parallel on opposite sides from a sawn timber, with separation of the side timbers by a cutting device (3a), each of the two side timbers (2a) is leveled so that the cutting plane and the plane of the plate (7) form an angle corresponding to the conicity of the sawn timber (2), the timber (2a) is glued one on the other with the same angle between the plane of cut and the plane of the flat, to form a wood with parallel surfaces, and they are squared in this state. Application to the manufacture of boards.

Description

Process for producing timber from tree trunks

  The invention relates to a method for producing a timber having flat and parallel surfaces on opposite sides from sawn timber in the form of trunks of trees and models, and wherein each timber is transported lengthwise in a predetermined direction of advance and the respective side timbers are separated on opposite sides with the aid of a sawing device, that the cutting planes

  between the lateral woods and the intermediate wood are

  between them, the sawnwood being flattened on the sides

  opposed by means of a removal of wood by means of a

  cutter, upstream of the sawing device in the

  direction in advance so that for each

  ral, the cutting plane and the flat plane, which are parallel

  between them, limit the cross-section of this lateral wood.

  ral perpendicular to the direction of advance.

  In known methods of this type, widely used in practice, sawn timber which is in the form of tree trunks or patterns is flattened on its opposite sides parallel to the cutting plane.

  saws, for example band saws, reciprocating saws,

  As a result, a lateral wood is obtained externally, on each side, which has, like the wood situated between these lateral woods, wide sides parallel to each other, and the cutting device removes, in because of the conicity of the sawn timber from its end on the crown to its root end, and with a fall having an increasing volume as chips, a wedge of wood, which reaches a significant thickness at root level end level This wood

  is not used as a board, board and

  This is added to the fact that the elimination of chips that accumulate in large quantities

is very expensive.

  We have already tried to obviate the previous disadvantage

  tooth by suppressing parallel planarization and bringing together

  by gluing, by their cutting surfaces, the two lateral

  the outermost areas, obtained during cutting, in

both their ends.

  The wood usually has a thickness approximately identical at both ends, at the thickest location, when the trunk or the model has been cut to a certain extent symmetrically, but rounded on both sides and therefore not suitable for further processing in conventional rendering machines, since on neither of these two opposite sides does it have a flat surface for

a sure support.

  The purpose of the invention is to indicate a method of

  previously indicated, which allows for further use

  wood cut up as it was until then, as useful timber in the form of planks,

  planks or similar, so that rendering requires

  can be run without problems on machines

rendering of the usual type.

  The problem indicated above is solved, in a process of the type indicated, thanks to the fact that each of the two lateral woods is leveled so that the plane of

  cut and the plane of the dish make a corresponding angle between them

  essentially at the conicity of the saw-timber or at a standardized value adapted from this conicity, so that two separate side-timber can be respectively applied, by their cutting surfaces, with the same

  angle between the cutting plane and the plane of the dish, the extremes

  thinner and more reciprocally permuted, to form a wood with parallel surfaces, to stick them one

  against each other and squaring them in this state.

  The method according to the invention provides external lateral woods, which, before joining by gluing, have on the outer side opposite to the cutting surface, the flat bearing surface necessary for the rendering of the piece of wood formed by gluing assembly and can also be also manufactured, as desired, with corner angles adapted to each other While retaining the possibility of rendering by rendering machines of the usual type, this leads to a significant increase in yield use of wood as well as a significant reduction in the amount of falls in the form of

chips.

  Preferably, the sawn timber are sent to the sawing device, with their top-facing end facing forward. This facilitates the optimization of the removal of the wood, making it possible to obtain a yield as high as

  possible use of side woods.

  The invention also provides a device for

  implementation of the process according to the invention.

  This device, which comprises at least one sawing device comprising at least two saws having cutting planes parallel to each other, a longitudinal transport device for moving sawn timber in the sawing device and respectively a cutting device arranged in upstream of the sawing device in the conveying direction and having cutting tools, adjustable in the direction transverse to the direction of transport, on opposite sides of the sawn timber, is characterized by a first coupling device serving to realize a linearly proportional coupling imposed between the lateral offset of the cutting tools and the forward movement of the sawn timber in the longitudinal conveying device. A preferred embodiment of this device, which includes a device for laterally guiding, on both sides, sawn timber between the cutting tools and the sawing device along the plate, is characterized by another coupling device serving to perform the forced linear proportional coupling between the lateral displacement of the guiding device and the advance movement of the saw timber in the longitudinal conveyor device or in the

  lateral offset of the cutting tools.

  According to another preferred embodiment of the device, the coupling devices are arranged in such a way that

  so that the lateral offset of the cutting tools and possibly

  the guiding device is chosen to be identical for

both sides of the wood.

  Other features and benefits of the

  present invention will emerge from the description given above.

  after reference is made to the accompanying drawings, in which: FIG. 1 shows a device for setting

  of the process according to the invention, according to a representative

  schematic perspective; Figure 2 shows a tree trunk treated by the device of Figure 1; FIG. 3 represents a model treated by the device of FIG. 1 and having an additional median cutoff; and

  FIG. 4 represents a wood obtained according to

  to the process according to the invention and by means of the device

  of Figure 1, after meeting by gluing the lateral woods.

  FIG. 1 diagrammatically shows only the most important parts in this respect of the device for carrying out the process according to the invention. A detailed representation of the drive device, mechanisms for the advance and arrangement of coupling devices as well as the shaft trunk feeder or the models, since it is possible to use for this purpose means known in the art. The device of FIG. 1 has, in the direction of advance, characterized by the arrow 1, sawn timber 2 constituted in this case by a tree trunk, a cutting device 3 comprising cutting tools. 3 has arranged on both sides of the sawing timber, a device 4 for guiding laterally and on both sides the sawn timber 2 and a guiding device 5, these units

  being arranged one after the other.

  A longitudinal transport device of known type, for example according to the German patent N 037 09 240, which guides the trunk also by supporting it safely, carries out the longitudinal transport of sawn timber 2 The arrow 1 of Figure 1 , which represents the sense of advance,

  also represents this longitudinal transport device.

  The cutting device 3 has, on each side of the sawmill 2, a rotary cutting tool 3a of known type, which can be moved substantially perpendicularly to the longitudinal conveying direction 1, in the direction of the arrow 6, at means of which the wood can be flattened on a

side or on its other side.

  The guiding device 4 is also of a known type and is represented here in the form of a roller mechanism respectively comprising three guiding rollers 4a on each side of the wood and which attack the flat 7 previously formed by the cutting tools. cut 3a, to guide the wood 2 safely, in a stable position, about its central axis, so that when sawing the wood can not

  move sideways or turn around its longitudinal axis

  tudinal. The forward movement of the longitudinal conveying device 1 and the lateral displacement of the cutting tools 3 according to the arrows 6 can be coupled to each other in a linearly proportional manner by means of a first coupling device 8 of a known type not shown in detail in the drawing, so that, in the case of a wood 2 which has been uniformly advanced with its crown head facing forward, the cutting tools 3a move uniformly outwardly of the wood over a distance which is in a given ratio with this feed and can be selected between certain limits

  and possibly differently from one side of the wood to the other.

  In the case of an advance, in principle also possible, wood 2 with its end turned towards the roots towards the front, the cutting tools would move towards the wood In all cases, this coupling has the effect of iron out

  wood 2 only in the direction of the height, parallel-

  5 to the cutting plane of the saws 5a shown in FIG. 1 in the form of band saw blades, whereas the flat 7 which extends in the direction of transport of the wood 2 makes, with this cutting plane, an acute angle that corresponds to the

  taper 2 or a standardized value of this cone

  cited and can be predetermined by means of the appropriate adjustment of the coupling ratio in the first coupling device

  in the first coupling device 8 A normal value

  which often occurs in practice for the con-

  quoted where the coupling ratio to be set here is mm for 1000 mm length of wood In the case of such a type of wood and for wood 2 fairly straight, is obtained respectively, along the wood, a flat 7 having an approximately constant width, as is

visible in Figure 1.

  When the wood 2 has been sawn by the saw 5, it is in the state corresponding to FIG. 2 or FIG. 3, depending on whether a trunk has been treated (FIG. 2) according to what is called a preparatory section (Figure 2) or a model according to what is called a subsequent section (Figure 3) In all cases, during this treatment, it is performed between the woods

  side 2 arranged in accordance with the invention, again

  any number of separating cups 2b by correspondingly using other saws 5a (Fig. 3). As shown in FIG. 4, the wedge-shaped sidewoods are pressed against each other in pairs by their cutting surfaces produced by the saws 5a with their thick and thin inverted ends. one against the other, and we stick them

  one on the other using a glue deposited beforehand.

  Couplings are used, respectively, lateral woods 2a having identical corner angles, which do not necessarily have to be obtained during the same processing operation In the case of a corresponding configuration of the first coupling device 8, can also operate so as to obtain, for the same wood 2, the lateral woods 2 a

  having different corner angles on both sides.

  Because of the choice of identical corner angles for the couples to be joined by gluing, these outer wide sides, which are however always parallel to each other after their meeting by gluing, formed by the plates 7 and can therefore be squared to the in a conventional board, a conventional plank, a conventional bar or the like, in a rendering machine of the usual type, mounted downstream. It is obvious that the yield can be very greatly increased in this way. useful wood, with significantly lower chips, while using the machines usually found in a sawmill, only through the use of a

  additional coupling not very complex.

  When, as is the case with the device of FIG. 1, provision is also made, between the cutting device 3 and the saw 5, for particularly reliable guiding of the wood 2, a particular lateral guide 4 presented here under the form of the roller unit, this guide is coupled by means of a second coupling device 9 either directly or, as shown in FIG. 1, by means of coupling to the lateral displacement of the cutting tools 3 a, in a manner also linearly proportional to the displacement of the longitudinal transport device 1, and with the same coupling ratio as that set for the

  coupling 8 for the considered side.

  With regard to the coupling devices 8 and 9, it can be any mechanical device,

  hydraulic, electrical, electronic or any other

  positive of another type, known, which allows to control the displacement of cutting tools 3a and parts, located on both sides, of the lateral guide 4, in a dependent manner

  linearly of the displacement of the long-distance

tudinal 1.

  In FIG. 1, the devices of FIG.

  coupling 8 and 9 only for one side of Natural wood-

  corresponding coupling is also provided for the cutting tool 3a and for the guide rollers 4a, on

the other side of the wood.

Claims (4)

claims-   1 Process for producing a timber   flat and parallel surfaces on opposite sides   based on sawn timber (2) in the form of tree trunks and models, and according to which each saw timber is transported in the direction of its length in a predetermined direction of advance and separating the respective lateral woods (2 a), on opposite sides, with the aid of a sawing device, that the cutting planes between the lateral woods and the intermediate wood are parallel to each other, the sawn timber (2 ) being flattened on the opposite sides by means of a woodcut using a cutting device, upstream of the sawing device in the direction of advance so that, for each lateral wood, the plane cutting and flat plane, which are parallel between   they limit the cross-section of this lateral wood   pendicularly to the direction of advance, characterized by the fact that each of the two lateral woods (2 a) is leveled so that the cutting plane and the plane of the plate (7) make   between them an angle corresponding essentially to the   sawn lumber (2) or a suitable standardized value   of this conicity, so that one can apply   two separate sidewalls (2a) against each other, by their cutting surfaces, with the same angle between the cutting plane and the plane of the dish, the thinner and thicker ends reciprocally permuted, to form a wood with parallel surfaces, stick them one against   the other and squaring them in this state.   Process according to Claim 1, characterized   in that the sawn timber (2) is sent to the   sawing machine (5), the crown end being located in front. 3 Device for implementing the method   according to one of claims 1 or 2, comprising at least   a sawing device comprising at least two saws   with parallel cutting planes between them, a longitudinal conveyor device for moving the sawn timber in the sawing device and respectively a cutting device arranged upstream of the sawing device in the transport direction and comprising cutting tools , adjustable in the direction transverse to the conveying direction, on opposite sides of the sawn timber, characterized by a first coupling device (8) for effecting a linearly proportional coupling imposed between the lateral offset of the cutting tools ( 3 a) and   the advance movement of sawn timber (2) in the arrangement   longitudinal transport system (1).   Apparatus according to claim 3, comprising   a device for guiding laterally, on both sides, sawn timber between the cutting tools and the sawing device along the flat, characterized by a   another coupling device (9) for carrying out the coupling   forced proportional linear range between the lateral displacement of the guiding device (4) and the advance movement of the sawn timber (2) in the longitudinal conveying device   (1) or the lateral offset of the cutting tools (3 a).   Device according to Claim 3 or 4, characterized in that the coupling devices (8, 9) are arranged in such a way that the lateral offset of the cutting tools (3 a) and possibly the   guiding (4) is chosen identical for both sides of the wood.