FI75113C - Procedure for cutting saw timber in module length or to falling length - Google Patents

Description

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®f3F? [B] (1> UTLÄGGNINGSSKR, FT 75113 i4Bi (51) Kv.lk.VlntCI.4 B 27 B 1/00

SUOMI FINLAND

(Fl) (21) Patent application - Patentansökning 780400 (22) Application date - Ansökningsdag 08.02.78

National Board of Patents and Registration (23) Start Date-Giltighetsdag 08.02.78

Patent-och registerstyrelsen (41) Has become public - Bhvit offentiig 09.08.79 (44) Date of dispatch and of publication. - 29.01.88

Ansökan utlagd och utl.skriften publicerad (86) Kv. application - Irst ansokan (32) (33) (31) Privilege claimed - Begärd priority (71) A. Ahlström Osakeyhtiö, Noormarkku, Fl; PL 18, 48601 Karhula,

Suomi-F Inland (FI) (72) Olli Heikinheimo, Helsinki, Suomi-Finland (FI) (54) Method for cutting sawn timber into modular length or falling length - Förfarande för kapning av sägvirke account modullängd eller i fallande längd

The invention relates to a method for cutting sawn timber into a module length or a falling length, in which the sawn timber is transported one by one transversely by a conveyor and the base end of the chute is leveled and the piece is judged to determine the cut-off point.

Timber intended specifically for export must be cut at the request of the consignee. the module length. In this case, the normal length of sawn timber delivered abroad is always 30 cm when cut from 180 cm to C> 00 cm. intervals. As a result, less than the length of the module, i.e. 0-30 cm, is lost from each piece of timber.

On the other hand, the so-called the quality of the carpentry is cut to a falling length, which means only the elimination of the defect required by each quality class of the timber. The same can be done when the timber is to be further processed for fingers.

Proposals for carrying out the method described above are already known. For example, Finnish Patent Application No. 2632/74 discloses a method for cutting timber in sorting plants simultaneously to modular and arbitrary lengths. According to the method described in said application, the pieces of timber are moved one after the other in the transverse direction one by one and the other end of the pieces of timber is compensated for. The pieces of timber are then moved longitudinally so that the opposite ends of their aligned ends come to the same level, after which the pieces of timber are further moved longitudinally to such a position that the part exceeding their modulus dimension is brought outside the cutting line. If the part is: to be cut to module size, the cut is performed with the piece in this position. If the part is to be cut to a falling length, it is examined whether the defective part is smaller than the part exceeding the modulus dimension. If this is the case, the piece is moved inwards from the cutting line.

If, on the other hand, the defective portion is larger than the above-mentioned portion exceeding the modulus dimension, the piece is moved out of the cut line so much that the erroneous portion can be removed.

The disadvantage of the above method is that the piece of timber to be cut to the falling length has to be moved either inwards or outwards, depending on the magnitude of the defect. In practice, such a transfer in different directions requires different devices for moving the pieces in and 7511 3 3 out. Of course, the transfer can also be performed with one device, but this then becomes very complicated.

With the method according to the invention, e.g. the above disadvantage is avoided. In addition, the method according to the invention is particularly well suited for connection to a timber leveling plant in which the timber is moved in its longitudinal direction by means of transverse rollers arranged in chains at intervals.

In the following, the invention and the advantages obtained by it will be explained in detail with reference to the accompanying drawing. The drawing shows a schematic top view of a sawn timber sorting and leveling plant.

The leveling and sorting plant includes a conventional unloading elevator, which unloads the load arriving from the dryer in layers. The resulting timber mat is then distributed; into individual pieces, e.g. by means of a scatter pocket and a curtain. Each piece is then moved by a transverse roller toward a fixed abutment so that the base ends of the lumber pieces all come on the same line. These steps are not shown in the drawing. A turning device 1 placed on the conveyor track rotates each piece of wood around 180 ° so that the base end reviewer 2 can determine the sawing point of the base end leveling cut. Based on the cutting impulse given by the reviewer 2, the timber is moved longitudinally to such a point that the blade 14 cuts the base from the desired point. In the next step, each piece of lumber is moved from the transverse roller roll 3 in the direction of the top against a fixed stop 4. In this longitudinal position, each piece is moved transversely by the so-called to module 5 responses. The module responses are located on the transport track at the base side of the sawn timber and their distances from the above-mentioned fixed response are staggered every 30 cm. The module stops 5 consist of a metal plate 4 75113 mounted so as to be freely pivotable at its upper front corner, so that when the board or the like arrives at the module stop, the stop pivots upwards about its axis and allows the board to travel. When the sawn timber piece is at the module stops 5, it is moved in its longitudinal direction in the direction of the base, whereby each piece moves against the first modular stop 5 which was not raised when the sawn timber moved to the stops. Thus, each piece moves in the direction of the base by less than the length of the module.

With the sawn timber pieces in their longitudinal position in this position, a top end evaluation is performed. The grading can take place, for example, at three points at the same time, in which case each grading site always has its own turning device 6, 7, 8. In this case, only every third piece of sawn timber is graded at the passing timber flow at each grading site 9, 10, 11. After the evaluation of the top end, the pieces are moved longitudinally against the chain gap responses 12 placed at module intervals. Of the chain hoists 12, the one corresponding to the cut-off information given by the inspector 9, 10, 11 is automatically selected for each board. If the piece of timber is to be cut to module size, it is selected from the chain hole responses 12 such that the final piece of sawn timber no longer contains an error, taking into account the quality class of the sawn piece. In other words, the first module to be removed from the point of cutting contains both defective and defect-free timber. The above procedure is the normal procedure when it is desired to cut the sawn timber to module size.

If only an incorrect portion of a particular piece is to be cut, i.e. it is cut to a falling length, the chain locks 12 are programmed so that the sawn piece is cut longer than one module. In other words, the blade 15 cuts the part so that it contains an incorrect part counting from the end, but only less than π 751 1 3 of the length of the module. In the next step, the pieces of timber are moved outwards from the sawing line by a distance determined by a steplessly adjustable stop 13. The stop 13 is preferably of the same type as the apparatus disclosed in the same applicant's patent application No. 773038. The transfer distance determined by the response 13 is in turn arranged to be equal to the size of the defective part still at the end of the board. Thus, if desired, each piece can be cut with a blade 16 to an arbitrary length.

The invention has been described above with reference to only one preferred embodiment. It should be noted, however, that the apparatus described above is only an example of the application of the method according to the invention, and the invention can be modified in many ways within the scope of the inventive idea set forth in the claim. For example, chain slave responses 12 can be programmed to contain n invalid modules. The blade 16 then cuts the correspondingly adjusted (n - 1) pieces of the faulty module as well as the faulty part of the n modules, as determined by the steplessly adjustable obstacle unit 13. If the erroneous proportion of the piece of timber is less than n modules, the piece is then cut only once with a blade 16 from a stepless point determined by the adjustable ectekola response 13.

In order to achieve a more advantageous embodiment of the presented apparatus and the method according to the invention, a piece of timber 15 is cut with a blade so that it contains n pieces of defective modules, regardless of whether the end product is a module-sized piece or pieces cut to a falling length. In this case, n is the same for all, whereby the blade 16 cuts the difference between the number of modules given by the reviewer 9, 10, 11 and the difference between the desired length of the desired pieces of timber and the difference between n by the adjustable obstacle unit 13. At its most preferred, n is the number of modules given by the reviewer -1.

Claims (2)

6 751 1 3 A method of cutting sawn timber into a modular length or falling length, wherein the sawn timber pieces are individually transported transversely across the conveyor and each base end is aligned and the piece is judged to determine the top end cutting point, after which the piece is mechanically moved longitudinally to first to module length, characterized in that each piece of timber is first cut to a modulus length n longer than the final length of the timber in module length, and in the next cutting step n modules are cut from the piece to be cut to module length, while the falling piece is cut to length (n - 1) module + invalid share of the first additional module (n = 0, 1, 2, etc ...; however, n = 0 only when aiming for module-length sawn timber). A method according to claim 1, characterized in that in the first cutting step the timber to be cut to module length is cut directly to the final module length, i.e. n = 0 js, the cut piece is first cut one module too long, i.e. n = 1, and then in the next step the incorrect part is removed. than the module length.